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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001-2002 Intel Corp. | |
7 | * Copyright (c) 2002 Nokia Corp. | |
8 | * | |
60c778b2 | 9 | * This is part of the SCTP Linux Kernel Implementation. |
1da177e4 LT |
10 | * |
11 | * These are the state functions for the state machine. | |
12 | * | |
1da177e4 LT |
13 | * Please send any bug reports or fixes you make to the |
14 | * email address(es): | |
91705c61 | 15 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 16 | * |
1da177e4 LT |
17 | * Written or modified by: |
18 | * La Monte H.P. Yarroll <piggy@acm.org> | |
19 | * Karl Knutson <karl@athena.chicago.il.us> | |
20 | * Mathew Kotowsky <kotowsky@sctp.org> | |
21 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
22 | * Jon Grimm <jgrimm@us.ibm.com> | |
23 | * Hui Huang <hui.huang@nokia.com> | |
24 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
25 | * Daisy Chang <daisyc@us.ibm.com> | |
26 | * Ardelle Fan <ardelle.fan@intel.com> | |
27 | * Ryan Layer <rmlayer@us.ibm.com> | |
28 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
29 | */ |
30 | ||
145ce502 JP |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
1da177e4 LT |
33 | #include <linux/types.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/ip.h> | |
36 | #include <linux/ipv6.h> | |
37 | #include <linux/net.h> | |
38 | #include <linux/inet.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #include <net/sock.h> |
41 | #include <net/inet_ecn.h> | |
42 | #include <linux/skbuff.h> | |
43 | #include <net/sctp/sctp.h> | |
44 | #include <net/sctp/sm.h> | |
45 | #include <net/sctp/structs.h> | |
46 | ||
103d750c MH |
47 | #define CREATE_TRACE_POINTS |
48 | #include <trace/events/sctp.h> | |
49 | ||
172a1599 XL |
50 | static struct sctp_packet *sctp_abort_pkt_new( |
51 | struct net *net, | |
52 | const struct sctp_endpoint *ep, | |
53 | const struct sctp_association *asoc, | |
54 | struct sctp_chunk *chunk, | |
55 | const void *payload, size_t paylen); | |
1da177e4 LT |
56 | static int sctp_eat_data(const struct sctp_association *asoc, |
57 | struct sctp_chunk *chunk, | |
a85bbeb2 | 58 | struct sctp_cmd_seq *commands); |
172a1599 XL |
59 | static struct sctp_packet *sctp_ootb_pkt_new( |
60 | struct net *net, | |
61 | const struct sctp_association *asoc, | |
62 | const struct sctp_chunk *chunk); | |
24cb81a6 EB |
63 | static void sctp_send_stale_cookie_err(struct net *net, |
64 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
65 | const struct sctp_association *asoc, |
66 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 67 | struct sctp_cmd_seq *commands, |
1da177e4 | 68 | struct sctp_chunk *err_chunk); |
172a1599 XL |
69 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
70 | struct net *net, | |
71 | const struct sctp_endpoint *ep, | |
72 | const struct sctp_association *asoc, | |
73 | const union sctp_subtype type, | |
74 | void *arg, | |
75 | struct sctp_cmd_seq *commands); | |
76 | static enum sctp_disposition sctp_sf_shut_8_4_5( | |
77 | struct net *net, | |
78 | const struct sctp_endpoint *ep, | |
79 | const struct sctp_association *asoc, | |
80 | const union sctp_subtype type, | |
81 | void *arg, | |
82 | struct sctp_cmd_seq *commands); | |
83 | static enum sctp_disposition sctp_sf_tabort_8_4_8( | |
84 | struct net *net, | |
24cb81a6 | 85 | const struct sctp_endpoint *ep, |
ece25dfa | 86 | const struct sctp_association *asoc, |
bfc6f827 | 87 | const union sctp_subtype type, |
ece25dfa | 88 | void *arg, |
a85bbeb2 | 89 | struct sctp_cmd_seq *commands); |
1da177e4 LT |
90 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
91 | ||
172a1599 XL |
92 | static enum sctp_disposition sctp_stop_t1_and_abort( |
93 | struct net *net, | |
94 | struct sctp_cmd_seq *commands, | |
95 | __be16 error, int sk_err, | |
96 | const struct sctp_association *asoc, | |
97 | struct sctp_transport *transport); | |
52c1da39 | 98 | |
172a1599 XL |
99 | static enum sctp_disposition sctp_sf_abort_violation( |
100 | struct net *net, | |
101 | const struct sctp_endpoint *ep, | |
102 | const struct sctp_association *asoc, | |
103 | void *arg, | |
104 | struct sctp_cmd_seq *commands, | |
105 | const __u8 *payload, | |
106 | const size_t paylen); | |
aecedeab | 107 | |
172a1599 XL |
108 | static enum sctp_disposition sctp_sf_violation_chunklen( |
109 | struct net *net, | |
110 | const struct sctp_endpoint *ep, | |
111 | const struct sctp_association *asoc, | |
112 | const union sctp_subtype type, | |
113 | void *arg, | |
114 | struct sctp_cmd_seq *commands); | |
1da177e4 | 115 | |
172a1599 XL |
116 | static enum sctp_disposition sctp_sf_violation_paramlen( |
117 | struct net *net, | |
118 | const struct sctp_endpoint *ep, | |
119 | const struct sctp_association *asoc, | |
120 | const union sctp_subtype type, | |
121 | void *arg, void *ext, | |
122 | struct sctp_cmd_seq *commands); | |
6f4c618d | 123 | |
172a1599 XL |
124 | static enum sctp_disposition sctp_sf_violation_ctsn( |
125 | struct net *net, | |
126 | const struct sctp_endpoint *ep, | |
127 | const struct sctp_association *asoc, | |
128 | const union sctp_subtype type, | |
129 | void *arg, | |
130 | struct sctp_cmd_seq *commands); | |
aecedeab | 131 | |
172a1599 XL |
132 | static enum sctp_disposition sctp_sf_violation_chunk( |
133 | struct net *net, | |
134 | const struct sctp_endpoint *ep, | |
135 | const struct sctp_association *asoc, | |
136 | const union sctp_subtype type, | |
137 | void *arg, | |
138 | struct sctp_cmd_seq *commands); | |
ece25dfa | 139 | |
4785c7ae | 140 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 141 | const struct sctp_association *asoc, |
172a1599 | 142 | struct sctp_chunk *chunk); |
bbd0d598 | 143 | |
172a1599 XL |
144 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
145 | struct net *net, | |
24cb81a6 | 146 | const struct sctp_endpoint *ep, |
75205f47 | 147 | const struct sctp_association *asoc, |
bfc6f827 | 148 | const union sctp_subtype type, |
75205f47 | 149 | void *arg, |
a85bbeb2 | 150 | struct sctp_cmd_seq *commands); |
75205f47 | 151 | |
ba03b9ba XL |
152 | static enum sctp_disposition |
153 | __sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep, | |
154 | const struct sctp_association *asoc, | |
155 | const union sctp_subtype type, void *arg, | |
156 | struct sctp_cmd_seq *commands); | |
157 | ||
1da177e4 LT |
158 | /* Small helper function that checks if the chunk length |
159 | * is of the appropriate length. The 'required_length' argument | |
160 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
161 | * Return Values: true = Valid length |
162 | * false = Invalid length | |
1da177e4 LT |
163 | * |
164 | */ | |
172a1599 XL |
165 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
166 | __u16 required_length) | |
1da177e4 LT |
167 | { |
168 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
169 | ||
26b87c78 DB |
170 | /* Previously already marked? */ |
171 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 172 | return false; |
1da177e4 | 173 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 174 | return false; |
1da177e4 | 175 | |
509e7a31 | 176 | return true; |
1da177e4 LT |
177 | } |
178 | ||
f8b6b19c XL |
179 | /* Check for format error in an ABORT chunk */ |
180 | static inline bool sctp_err_chunk_valid(struct sctp_chunk *chunk) | |
181 | { | |
182 | struct sctp_errhdr *err; | |
183 | ||
184 | sctp_walk_errors(err, chunk->chunk_hdr); | |
185 | ||
186 | return (void *)err == (void *)chunk->chunk_end; | |
187 | } | |
188 | ||
1da177e4 LT |
189 | /********************************************************** |
190 | * These are the state functions for handling chunk events. | |
191 | **********************************************************/ | |
192 | ||
193 | /* | |
194 | * Process the final SHUTDOWN COMPLETE. | |
195 | * | |
196 | * Section: 4 (C) (diagram), 9.2 | |
197 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
198 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
199 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
200 | * should stop the T2-shutdown timer and remove all knowledge of the | |
201 | * association (and thus the association enters the CLOSED state). | |
202 | * | |
047a2428 | 203 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
204 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
205 | * ... | |
047a2428 JF |
206 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
207 | * if the Verification Tag field of the packet matches its own tag and | |
208 | * the T bit is not set | |
209 | * OR | |
210 | * it is set to its peer's tag and the T bit is set in the Chunk | |
211 | * Flags. | |
212 | * Otherwise, the receiver MUST silently discard the packet | |
213 | * and take no further action. An endpoint MUST ignore the | |
214 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
215 | * |
216 | * Inputs | |
217 | * (endpoint, asoc, chunk) | |
218 | * | |
219 | * Outputs | |
220 | * (asoc, reply_msg, msg_up, timers, counters) | |
221 | * | |
222 | * The return value is the disposition of the chunk. | |
223 | */ | |
172a1599 XL |
224 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
225 | const struct sctp_endpoint *ep, | |
226 | const struct sctp_association *asoc, | |
227 | const union sctp_subtype type, | |
228 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
229 | { |
230 | struct sctp_chunk *chunk = arg; | |
231 | struct sctp_ulpevent *ev; | |
232 | ||
ece25dfa | 233 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 234 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 235 | |
1da177e4 LT |
236 | /* RFC 2960 6.10 Bundling |
237 | * | |
238 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
239 | * SHUTDOWN COMPLETE with any other chunks. | |
240 | */ | |
241 | if (!chunk->singleton) | |
24cb81a6 | 242 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 243 | |
ece25dfa | 244 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 245 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 246 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 247 | commands); |
1da177e4 LT |
248 | |
249 | /* RFC 2960 10.2 SCTP-to-ULP | |
250 | * | |
251 | * H) SHUTDOWN COMPLETE notification | |
252 | * | |
253 | * When SCTP completes the shutdown procedures (section 9.2) this | |
254 | * notification is passed to the upper layer. | |
255 | */ | |
256 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 257 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
258 | if (ev) |
259 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 260 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
261 | |
262 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
263 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
264 | * not the chunk should be discarded. If the endpoint is in | |
265 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
266 | * T2-shutdown timer and remove all knowledge of the | |
267 | * association (and thus the association enters the CLOSED | |
268 | * state). | |
269 | */ | |
270 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
271 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
272 | ||
273 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
274 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
275 | ||
276 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
277 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
278 | ||
b01a2407 EB |
279 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
280 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
281 | |
282 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
283 | ||
284 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
285 | } |
286 | ||
287 | /* | |
288 | * Respond to a normal INIT chunk. | |
289 | * We are the side that is being asked for an association. | |
290 | * | |
291 | * Section: 5.1 Normal Establishment of an Association, B | |
292 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
293 | * destination IP address of the INIT ACK MUST be set to the source | |
294 | * IP address of the INIT to which this INIT ACK is responding. In | |
295 | * the response, besides filling in other parameters, "Z" must set the | |
296 | * Verification Tag field to Tag_A, and also provide its own | |
297 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
298 | * | |
d808ad9a | 299 | * Verification Tag: Must be 0. |
1da177e4 LT |
300 | * |
301 | * Inputs | |
302 | * (endpoint, asoc, chunk) | |
303 | * | |
304 | * Outputs | |
305 | * (asoc, reply_msg, msg_up, timers, counters) | |
306 | * | |
307 | * The return value is the disposition of the chunk. | |
308 | */ | |
172a1599 XL |
309 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
310 | const struct sctp_endpoint *ep, | |
311 | const struct sctp_association *asoc, | |
312 | const union sctp_subtype type, | |
313 | void *arg, | |
314 | struct sctp_cmd_seq *commands) | |
1da177e4 | 315 | { |
62e6b7e4 XL |
316 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
317 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 318 | struct sctp_association *new_asoc; |
1da177e4 | 319 | struct sctp_packet *packet; |
1da177e4 LT |
320 | int len; |
321 | ||
2277c7cd RH |
322 | /* Update socket peer label if first association. */ |
323 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
324 | chunk->skb)) | |
325 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
326 | ||
1da177e4 LT |
327 | /* 6.10 Bundling |
328 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
329 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 330 | * |
1da177e4 LT |
331 | * IG Section 2.11.2 |
332 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
333 | * enforce these rules by silently discarding an arriving packet | |
334 | * with an INIT chunk that is bundled with other chunks. | |
335 | */ | |
336 | if (!chunk->singleton) | |
24cb81a6 | 337 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 338 | |
ba03b9ba XL |
339 | /* Make sure that the INIT chunk has a valid length. |
340 | * Normally, this would cause an ABORT with a Protocol Violation | |
341 | * error, but since we don't have an association, we'll | |
342 | * just discard the packet. | |
343 | */ | |
344 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) | |
345 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
346 | ||
1da177e4 LT |
347 | /* If the packet is an OOTB packet which is temporarily on the |
348 | * control endpoint, respond with an ABORT. | |
349 | */ | |
2ce95503 | 350 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 351 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 352 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 353 | } |
1da177e4 | 354 | |
1da177e4 | 355 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 356 | * Tag. |
1da177e4 LT |
357 | */ |
358 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 359 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 | 360 | |
bec9640b VY |
361 | /* If the INIT is coming toward a closing socket, we'll send back |
362 | * and ABORT. Essentially, this catches the race of INIT being | |
363 | * backloged to the socket at the same time as the user isses close(). | |
364 | * Since the socket and all its associations are going away, we | |
365 | * can treat this OOTB | |
366 | */ | |
367 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 368 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 369 | |
1da177e4 LT |
370 | /* Verify the INIT chunk before processing it. */ |
371 | err_chunk = NULL; | |
b14878cc | 372 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 373 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
374 | &err_chunk)) { |
375 | /* This chunk contains fatal error. It is to be discarded. | |
376 | * Send an ABORT, with causes if there is any. | |
377 | */ | |
378 | if (err_chunk) { | |
24cb81a6 | 379 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 380 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 381 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 382 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 383 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
384 | |
385 | sctp_chunk_free(err_chunk); | |
386 | ||
387 | if (packet) { | |
388 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
389 | SCTP_PACKET(packet)); | |
b01a2407 | 390 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
391 | return SCTP_DISPOSITION_CONSUME; |
392 | } else { | |
393 | return SCTP_DISPOSITION_NOMEM; | |
394 | } | |
395 | } else { | |
24cb81a6 | 396 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
397 | commands); |
398 | } | |
399 | } | |
400 | ||
d808ad9a | 401 | /* Grab the INIT header. */ |
4ae70c08 | 402 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
403 | |
404 | /* Tag the variable length parameters. */ | |
4ae70c08 | 405 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
406 | |
407 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
408 | if (!new_asoc) | |
409 | goto nomem; | |
410 | ||
409b95af VY |
411 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
412 | sctp_scope(sctp_source(chunk)), | |
413 | GFP_ATOMIC) < 0) | |
414 | goto nomem_init; | |
415 | ||
1da177e4 | 416 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 417 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 418 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
419 | GFP_ATOMIC)) |
420 | goto nomem_init; | |
421 | ||
1da177e4 LT |
422 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
423 | ||
424 | /* If there are errors need to be reported for unknown parameters, | |
425 | * make sure to reserve enough room in the INIT ACK for them. | |
426 | */ | |
427 | len = 0; | |
428 | if (err_chunk) | |
429 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 430 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 431 | |
1da177e4 LT |
432 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
433 | if (!repl) | |
df7deeb5 | 434 | goto nomem_init; |
1da177e4 LT |
435 | |
436 | /* If there are errors need to be reported for unknown parameters, | |
437 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
438 | * parameter. | |
439 | */ | |
440 | if (err_chunk) { | |
441 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
442 | * ERROR chunk generated by sctp_verify_init(). Since the | |
443 | * error cause code for "unknown parameter" and the | |
444 | * "Unrecognized parameter" type is the same, we can | |
445 | * construct the parameters in INIT ACK by copying the | |
446 | * ERROR causes over. | |
447 | */ | |
62e6b7e4 | 448 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 449 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 450 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
451 | /* Replace the cause code with the "Unrecognized parameter" |
452 | * parameter type. | |
453 | */ | |
454 | sctp_addto_chunk(repl, len, unk_param); | |
455 | sctp_chunk_free(err_chunk); | |
456 | } | |
457 | ||
df7deeb5 VY |
458 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
459 | ||
1da177e4 LT |
460 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
461 | ||
462 | /* | |
463 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
464 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
465 | * new association. Otherwise, "Z" will be vulnerable to resource | |
466 | * attacks. | |
467 | */ | |
468 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
469 | ||
470 | return SCTP_DISPOSITION_DELETE_TCB; | |
471 | ||
1da177e4 LT |
472 | nomem_init: |
473 | sctp_association_free(new_asoc); | |
474 | nomem: | |
df7deeb5 VY |
475 | if (err_chunk) |
476 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
477 | return SCTP_DISPOSITION_NOMEM; |
478 | } | |
479 | ||
480 | /* | |
481 | * Respond to a normal INIT ACK chunk. | |
482 | * We are the side that is initiating the association. | |
483 | * | |
484 | * Section: 5.1 Normal Establishment of an Association, C | |
485 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
486 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
487 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
488 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
489 | * | |
490 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
491 | * DATA chunks, but it MUST be the first chunk in the packet and | |
492 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
493 | * other packets to the peer. | |
494 | * | |
495 | * Verification Tag: 3.3.3 | |
496 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
497 | * found to be 0, the receiver MUST treat it as an error and close the | |
498 | * association by transmitting an ABORT. | |
499 | * | |
500 | * Inputs | |
501 | * (endpoint, asoc, chunk) | |
502 | * | |
503 | * Outputs | |
504 | * (asoc, reply_msg, msg_up, timers, counters) | |
505 | * | |
506 | * The return value is the disposition of the chunk. | |
507 | */ | |
172a1599 XL |
508 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
509 | const struct sctp_endpoint *ep, | |
510 | const struct sctp_association *asoc, | |
511 | const union sctp_subtype type, | |
512 | void *arg, | |
513 | struct sctp_cmd_seq *commands) | |
1da177e4 | 514 | { |
01a992be | 515 | struct sctp_init_chunk *initchunk; |
172a1599 | 516 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
517 | struct sctp_chunk *err_chunk; |
518 | struct sctp_packet *packet; | |
1da177e4 LT |
519 | |
520 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 521 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 522 | |
1da177e4 LT |
523 | /* 6.10 Bundling |
524 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
525 | * SHUTDOWN COMPLETE with any other chunks. | |
526 | */ | |
527 | if (!chunk->singleton) | |
24cb81a6 | 528 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 529 | |
ece25dfa | 530 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 531 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 532 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 533 | commands); |
1da177e4 | 534 | /* Grab the INIT header. */ |
4ae70c08 | 535 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 536 | |
1da177e4 LT |
537 | /* Verify the INIT chunk before processing it. */ |
538 | err_chunk = NULL; | |
b14878cc | 539 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 540 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
541 | &err_chunk)) { |
542 | ||
2a493216 | 543 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 544 | |
1da177e4 | 545 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
546 | * Send an ABORT, with causes. If there are no causes, |
547 | * then there wasn't enough memory. Just terminate | |
548 | * the association. | |
1da177e4 LT |
549 | */ |
550 | if (err_chunk) { | |
24cb81a6 | 551 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 552 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 553 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 554 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 555 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
556 | |
557 | sctp_chunk_free(err_chunk); | |
558 | ||
559 | if (packet) { | |
560 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
561 | SCTP_PACKET(packet)); | |
24cb81a6 | 562 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 563 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 564 | } |
1da177e4 | 565 | } |
bbd0d598 VY |
566 | |
567 | /* SCTP-AUTH, Section 6.3: | |
568 | * It should be noted that if the receiver wants to tear | |
569 | * down an association in an authenticated way only, the | |
570 | * handling of malformed packets should not result in | |
571 | * tearing down the association. | |
572 | * | |
573 | * This means that if we only want to abort associations | |
574 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 575 | * can't destroy this association just because the packet |
bbd0d598 VY |
576 | * was malformed. |
577 | */ | |
578 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 579 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 580 | |
24cb81a6 EB |
581 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
582 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 583 | asoc, chunk->transport); |
1da177e4 LT |
584 | } |
585 | ||
586 | /* Tag the variable length parameters. Note that we never | |
587 | * convert the parameters in an INIT chunk. | |
588 | */ | |
4ae70c08 | 589 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 590 | |
01a992be | 591 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
592 | |
593 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
594 | SCTP_PEER_INIT(initchunk)); | |
595 | ||
3f7a87d2 FF |
596 | /* Reset init error count upon receipt of INIT-ACK. */ |
597 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
598 | ||
1da177e4 LT |
599 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
600 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
601 | * timer, and enter the COOKIE-ECHOED state. | |
602 | */ | |
603 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
604 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
605 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
606 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
607 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
608 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
609 | ||
730fc3d0 VY |
610 | /* SCTP-AUTH: genereate the assocition shared keys so that |
611 | * we can potentially signe the COOKIE-ECHO. | |
612 | */ | |
613 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
614 | ||
1da177e4 LT |
615 | /* 5.1 C) "A" shall then send the State Cookie received in the |
616 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
617 | */ | |
618 | /* If there is any errors to report, send the ERROR chunk generated | |
619 | * for unknown parameters as well. | |
620 | */ | |
621 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
622 | SCTP_CHUNK(err_chunk)); | |
623 | ||
624 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
625 | } |
626 | ||
59d8d443 XL |
627 | static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, |
628 | const struct sctp_association *asoc) | |
629 | { | |
630 | struct sctp_chunk auth; | |
631 | ||
632 | if (!chunk->auth_chunk) | |
633 | return true; | |
634 | ||
635 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo | |
636 | * is supposed to be authenticated and we have to do delayed | |
637 | * authentication. We've just recreated the association using | |
638 | * the information in the cookie and now it's much easier to | |
639 | * do the authentication. | |
640 | */ | |
641 | ||
642 | /* Make sure that we and the peer are AUTH capable */ | |
643 | if (!net->sctp.auth_enable || !asoc->peer.auth_capable) | |
644 | return false; | |
645 | ||
646 | /* set-up our fake chunk so that we can process it */ | |
647 | auth.skb = chunk->auth_chunk; | |
648 | auth.asoc = chunk->asoc; | |
649 | auth.sctp_hdr = chunk->sctp_hdr; | |
650 | auth.chunk_hdr = (struct sctp_chunkhdr *) | |
651 | skb_push(chunk->auth_chunk, | |
652 | sizeof(struct sctp_chunkhdr)); | |
653 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
654 | auth.transport = chunk->transport; | |
655 | ||
656 | return sctp_sf_authenticate(asoc, &auth) == SCTP_IERROR_NO_ERROR; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | /* |
660 | * Respond to a normal COOKIE ECHO chunk. | |
661 | * We are the side that is being asked for an association. | |
662 | * | |
663 | * Section: 5.1 Normal Establishment of an Association, D | |
664 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
665 | * with a COOKIE ACK chunk after building a TCB and moving to | |
666 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
667 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
668 | * chunk MUST be the first chunk in the packet. | |
669 | * | |
670 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
671 | * Communication Up notification to the SCTP user upon reception | |
672 | * of a valid COOKIE ECHO chunk. | |
673 | * | |
674 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
675 | * D) Rules for packet carrying a COOKIE ECHO | |
676 | * | |
677 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
678 | * Initial Tag received in the INIT ACK. | |
679 | * | |
680 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
681 | * | |
682 | * Inputs | |
683 | * (endpoint, asoc, chunk) | |
684 | * | |
685 | * Outputs | |
686 | * (asoc, reply_msg, msg_up, timers, counters) | |
687 | * | |
688 | * The return value is the disposition of the chunk. | |
689 | */ | |
172a1599 XL |
690 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
691 | const struct sctp_endpoint *ep, | |
692 | const struct sctp_association *asoc, | |
693 | const union sctp_subtype type, | |
694 | void *arg, | |
695 | struct sctp_cmd_seq *commands) | |
1da177e4 | 696 | { |
30f6ebf6 | 697 | struct sctp_ulpevent *ev, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 | 698 | struct sctp_association *new_asoc; |
01a992be | 699 | struct sctp_init_chunk *peer_init; |
172a1599 | 700 | struct sctp_chunk *chunk = arg; |
1da177e4 | 701 | struct sctp_chunk *err_chk_p; |
172a1599 | 702 | struct sctp_chunk *repl; |
609ee467 | 703 | struct sock *sk; |
172a1599 | 704 | int error = 0; |
1da177e4 | 705 | |
b16b5ddc XL |
706 | if (asoc && !sctp_vtag_verify(chunk, asoc)) |
707 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
708 | ||
1da177e4 LT |
709 | /* If the packet is an OOTB packet which is temporarily on the |
710 | * control endpoint, respond with an ABORT. | |
711 | */ | |
2ce95503 | 712 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 713 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 714 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 715 | } |
1da177e4 LT |
716 | |
717 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
718 | * In this case, we check that we have enough for at least a | |
719 | * chunk header. More detailed verification is done | |
720 | * in sctp_unpack_cookie(). | |
721 | */ | |
922dbc5b | 722 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
b16b5ddc XL |
723 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
724 | commands); | |
1da177e4 | 725 | |
609ee467 VY |
726 | /* If the endpoint is not listening or if the number of associations |
727 | * on the TCP-style socket exceed the max backlog, respond with an | |
728 | * ABORT. | |
729 | */ | |
730 | sk = ep->base.sk; | |
731 | if (!sctp_sstate(sk, LISTENING) || | |
732 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 733 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 734 | |
1da177e4 LT |
735 | /* "Decode" the chunk. We have no optional parameters so we |
736 | * are in good shape. | |
737 | */ | |
d808ad9a | 738 | chunk->subh.cookie_hdr = |
1da177e4 | 739 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 740 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 741 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 742 | goto nomem; |
1da177e4 LT |
743 | |
744 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
745 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
746 | * and moving to the ESTABLISHED state. | |
747 | */ | |
748 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
749 | &err_chk_p); | |
750 | ||
751 | /* FIXME: | |
752 | * If the re-build failed, what is the proper error path | |
753 | * from here? | |
754 | * | |
755 | * [We should abort the association. --piggy] | |
756 | */ | |
757 | if (!new_asoc) { | |
758 | /* FIXME: Several errors are possible. A bad cookie should | |
759 | * be silently discarded, but think about logging it too. | |
760 | */ | |
761 | switch (error) { | |
762 | case -SCTP_IERROR_NOMEM: | |
763 | goto nomem; | |
764 | ||
765 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 766 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 767 | err_chk_p); |
24cb81a6 | 768 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
769 | |
770 | case -SCTP_IERROR_BAD_SIG: | |
771 | default: | |
24cb81a6 | 772 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 773 | } |
1da177e4 LT |
774 | } |
775 | ||
1da177e4 | 776 | |
df7deeb5 VY |
777 | /* Delay state machine commands until later. |
778 | * | |
779 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
780 | * the sctp_unpack_cookie() already. |
781 | */ | |
782 | /* This is a brand-new association, so these are not yet side | |
783 | * effects--it is safe to run them here. | |
784 | */ | |
785 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
786 | ||
de6becdc | 787 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 788 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
789 | peer_init, GFP_ATOMIC)) |
790 | goto nomem_init; | |
791 | ||
730fc3d0 VY |
792 | /* SCTP-AUTH: Now that we've populate required fields in |
793 | * sctp_process_init, set up the assocaition shared keys as | |
794 | * necessary so that we can potentially authenticate the ACK | |
795 | */ | |
796 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
797 | if (error) | |
798 | goto nomem_init; | |
799 | ||
59d8d443 XL |
800 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) { |
801 | sctp_association_free(new_asoc); | |
802 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
bbd0d598 VY |
803 | } |
804 | ||
1da177e4 LT |
805 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
806 | if (!repl) | |
df7deeb5 | 807 | goto nomem_init; |
1da177e4 LT |
808 | |
809 | /* RFC 2960 5.1 Normal Establishment of an Association | |
810 | * | |
811 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
812 | * send the Communication Up notification to the SCTP user | |
813 | * upon reception of a valid COOKIE ECHO chunk. | |
814 | */ | |
815 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
816 | new_asoc->c.sinit_num_ostreams, | |
817 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 818 | NULL, GFP_ATOMIC); |
1da177e4 LT |
819 | if (!ev) |
820 | goto nomem_ev; | |
821 | ||
d808ad9a | 822 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 823 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 824 | * delivers this notification to inform the application that of the |
0f3fffd8 | 825 | * peers requested adaptation layer. |
1da177e4 | 826 | */ |
0f3fffd8 ISJ |
827 | if (new_asoc->peer.adaptation_ind) { |
828 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 829 | GFP_ATOMIC); |
df7deeb5 VY |
830 | if (!ai_ev) |
831 | goto nomem_aiev; | |
832 | } | |
833 | ||
30f6ebf6 XL |
834 | if (!new_asoc->peer.auth_capable) { |
835 | auth_ev = sctp_ulpevent_make_authkey(new_asoc, 0, | |
836 | SCTP_AUTH_NO_AUTH, | |
837 | GFP_ATOMIC); | |
838 | if (!auth_ev) | |
839 | goto nomem_authev; | |
840 | } | |
841 | ||
df7deeb5 VY |
842 | /* Add all the state machine commands now since we've created |
843 | * everything. This way we don't introduce memory corruptions | |
844 | * during side-effect processing and correclty count established | |
845 | * associations. | |
846 | */ | |
847 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
848 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
849 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
850 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
851 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
852 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
853 | ||
9f70f46b | 854 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
855 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
856 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
857 | ||
df7deeb5 VY |
858 | /* This will send the COOKIE ACK */ |
859 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
860 | ||
861 | /* Queue the ASSOC_CHANGE event */ | |
862 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
863 | ||
864 | /* Send up the Adaptation Layer Indication event */ | |
865 | if (ai_ev) | |
1da177e4 | 866 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 867 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 | 868 | |
30f6ebf6 XL |
869 | if (auth_ev) |
870 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
871 | SCTP_ULPEVENT(auth_ev)); | |
872 | ||
1da177e4 LT |
873 | return SCTP_DISPOSITION_CONSUME; |
874 | ||
30f6ebf6 XL |
875 | nomem_authev: |
876 | sctp_ulpevent_free(ai_ev); | |
df7deeb5 VY |
877 | nomem_aiev: |
878 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
879 | nomem_ev: |
880 | sctp_chunk_free(repl); | |
1da177e4 LT |
881 | nomem_init: |
882 | sctp_association_free(new_asoc); | |
883 | nomem: | |
884 | return SCTP_DISPOSITION_NOMEM; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 889 | * We are the side that is asking for an association. |
1da177e4 LT |
890 | * |
891 | * RFC 2960 5.1 Normal Establishment of an Association | |
892 | * | |
893 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
894 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
895 | * timer. It may also notify its ULP about the successful | |
896 | * establishment of the association with a Communication Up | |
897 | * notification (see Section 10). | |
898 | * | |
899 | * Verification Tag: | |
900 | * Inputs | |
901 | * (endpoint, asoc, chunk) | |
902 | * | |
903 | * Outputs | |
904 | * (asoc, reply_msg, msg_up, timers, counters) | |
905 | * | |
906 | * The return value is the disposition of the chunk. | |
907 | */ | |
172a1599 XL |
908 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
909 | const struct sctp_endpoint *ep, | |
910 | const struct sctp_association *asoc, | |
911 | const union sctp_subtype type, | |
912 | void *arg, | |
913 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
914 | { |
915 | struct sctp_chunk *chunk = arg; | |
916 | struct sctp_ulpevent *ev; | |
917 | ||
918 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 919 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
920 | |
921 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
922 | * If we don't do this, any bundled chunks may be junked. | |
923 | */ | |
922dbc5b | 924 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 925 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
926 | commands); |
927 | ||
928 | /* Reset init error count upon receipt of COOKIE-ACK, | |
929 | * to avoid problems with the managemement of this | |
930 | * counter in stale cookie situations when a transition back | |
931 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
932 | * state is performed. | |
933 | */ | |
3f7a87d2 | 934 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 | 935 | |
2277c7cd RH |
936 | /* Set peer label for connection. */ |
937 | security_inet_conn_established(ep->base.sk, chunk->skb); | |
938 | ||
1da177e4 LT |
939 | /* RFC 2960 5.1 Normal Establishment of an Association |
940 | * | |
941 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
942 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
943 | * stopping the T1-cookie timer. | |
944 | */ | |
945 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
946 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
947 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
948 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
949 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
950 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 951 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 952 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
953 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
954 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
955 | |
956 | /* It may also notify its ULP about the successful | |
957 | * establishment of the association with a Communication Up | |
958 | * notification (see Section 10). | |
959 | */ | |
960 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
961 | 0, asoc->c.sinit_num_ostreams, | |
962 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 963 | NULL, GFP_ATOMIC); |
1da177e4 LT |
964 | |
965 | if (!ev) | |
966 | goto nomem; | |
967 | ||
968 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
969 | ||
970 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 971 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 972 | * delivers this notification to inform the application that of the |
0f3fffd8 | 973 | * peers requested adaptation layer. |
1da177e4 | 974 | */ |
0f3fffd8 ISJ |
975 | if (asoc->peer.adaptation_ind) { |
976 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
977 | if (!ev) |
978 | goto nomem; | |
979 | ||
980 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
981 | SCTP_ULPEVENT(ev)); | |
982 | } | |
983 | ||
30f6ebf6 XL |
984 | if (!asoc->peer.auth_capable) { |
985 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, | |
986 | GFP_ATOMIC); | |
987 | if (!ev) | |
988 | goto nomem; | |
989 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
990 | SCTP_ULPEVENT(ev)); | |
991 | } | |
992 | ||
1da177e4 LT |
993 | return SCTP_DISPOSITION_CONSUME; |
994 | nomem: | |
995 | return SCTP_DISPOSITION_NOMEM; | |
996 | } | |
997 | ||
998 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
999 | static enum sctp_disposition sctp_sf_heartbeat( |
1000 | const struct sctp_endpoint *ep, | |
1001 | const struct sctp_association *asoc, | |
1002 | const union sctp_subtype type, | |
1003 | void *arg, | |
1004 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1005 | { |
1006 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1007 | struct sctp_chunk *reply; | |
1da177e4 LT |
1008 | |
1009 | /* Send a heartbeat to our peer. */ | |
92c73af5 | 1010 | reply = sctp_make_heartbeat(asoc, transport); |
1da177e4 LT |
1011 | if (!reply) |
1012 | return SCTP_DISPOSITION_NOMEM; | |
1013 | ||
1014 | /* Set rto_pending indicating that an RTT measurement | |
1015 | * is started with this heartbeat chunk. | |
1016 | */ | |
1017 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
1018 | SCTP_TRANSPORT(transport)); | |
1019 | ||
1020 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1021 | return SCTP_DISPOSITION_CONSUME; | |
1022 | } | |
1023 | ||
1024 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
1025 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
1026 | const struct sctp_endpoint *ep, | |
1027 | const struct sctp_association *asoc, | |
1028 | const union sctp_subtype type, | |
1029 | void *arg, | |
1030 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1031 | { |
1032 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
1033 | ||
b9f84786 | 1034 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
1035 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
1036 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
1037 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
1038 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 1039 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1040 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1041 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1042 | return SCTP_DISPOSITION_DELETE_TCB; |
1043 | } | |
1044 | ||
1045 | /* Section 3.3.5. | |
1046 | * The Sender-specific Heartbeat Info field should normally include | |
1047 | * information about the sender's current time when this HEARTBEAT | |
1048 | * chunk is sent and the destination transport address to which this | |
1049 | * HEARTBEAT is sent (see Section 8.3). | |
1050 | */ | |
1051 | ||
52ccb8e9 | 1052 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1053 | if (SCTP_DISPOSITION_NOMEM == |
1054 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1055 | commands)) | |
1056 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1057 | |
1da177e4 LT |
1058 | /* Set transport error counter and association error counter |
1059 | * when sending heartbeat. | |
1060 | */ | |
7e99013a | 1061 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1062 | SCTP_TRANSPORT(transport)); |
1063 | } | |
245cba7e VY |
1064 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1065 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1066 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1067 | SCTP_TRANSPORT(transport)); | |
1068 | ||
d808ad9a | 1069 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1070 | } |
1071 | ||
7b9438de | 1072 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1073 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1074 | const struct sctp_endpoint *ep, | |
1075 | const struct sctp_association *asoc, | |
1076 | const union sctp_subtype type, | |
1077 | void *arg, | |
1078 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1079 | { |
1080 | struct sctp_transport *transport = arg; | |
1081 | ||
1082 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1083 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1084 | SCTP_ERROR(ETIMEDOUT)); | |
1085 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1086 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1087 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1088 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1089 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1090 | return SCTP_DISPOSITION_DELETE_TCB; | |
1091 | } | |
1092 | ||
1093 | sctp_chunk_hold(asoc->strreset_chunk); | |
1094 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1095 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1096 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1097 | ||
1098 | return SCTP_DISPOSITION_CONSUME; | |
1099 | } | |
1100 | ||
1da177e4 LT |
1101 | /* |
1102 | * Process an heartbeat request. | |
1103 | * | |
1104 | * Section: 8.3 Path Heartbeat | |
1105 | * The receiver of the HEARTBEAT should immediately respond with a | |
1106 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1107 | * from the received HEARTBEAT chunk. | |
1108 | * | |
1109 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1110 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1111 | * value in the Verification Tag field of the received SCTP packet | |
1112 | * matches its own Tag. If the received Verification Tag value does not | |
1113 | * match the receiver's own tag value, the receiver shall silently | |
1114 | * discard the packet and shall not process it any further except for | |
1115 | * those cases listed in Section 8.5.1 below. | |
1116 | * | |
1117 | * Inputs | |
1118 | * (endpoint, asoc, chunk) | |
1119 | * | |
1120 | * Outputs | |
1121 | * (asoc, reply_msg, msg_up, timers, counters) | |
1122 | * | |
1123 | * The return value is the disposition of the chunk. | |
1124 | */ | |
172a1599 XL |
1125 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1126 | const struct sctp_endpoint *ep, | |
1127 | const struct sctp_association *asoc, | |
1128 | const union sctp_subtype type, | |
1129 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1130 | { |
3c918704 | 1131 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1132 | struct sctp_chunk *chunk = arg; |
1133 | struct sctp_chunk *reply; | |
1134 | size_t paylen = 0; | |
1135 | ||
1136 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1137 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1138 | |
1139 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1140 | if (!sctp_chunk_length_valid(chunk, |
1141 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1142 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1143 | commands); |
1144 | ||
1145 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1146 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1147 | * Information field copied from the received HEARTBEAT chunk. | |
1148 | */ | |
4d2dcdf4 | 1149 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1150 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1151 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1152 | |
1153 | if (ntohs(param_hdr->length) > paylen) | |
1154 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1155 | param_hdr, commands); | |
1156 | ||
62b08083 SS |
1157 | if (!pskb_pull(chunk->skb, paylen)) |
1158 | goto nomem; | |
1da177e4 | 1159 | |
06a31e2b | 1160 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1161 | if (!reply) |
1162 | goto nomem; | |
1163 | ||
1164 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1165 | return SCTP_DISPOSITION_CONSUME; | |
1166 | ||
1167 | nomem: | |
1168 | return SCTP_DISPOSITION_NOMEM; | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Process the returning HEARTBEAT ACK. | |
1173 | * | |
1174 | * Section: 8.3 Path Heartbeat | |
1175 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1176 | * should clear the error counter of the destination transport | |
1177 | * address to which the HEARTBEAT was sent, and mark the destination | |
1178 | * transport address as active if it is not so marked. The endpoint may | |
1179 | * optionally report to the upper layer when an inactive destination | |
1180 | * address is marked as active due to the reception of the latest | |
1181 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1182 | * clear the association overall error count as well (as defined | |
1183 | * in section 8.1). | |
1184 | * | |
1185 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1186 | * measurement for that destination transport address using the time | |
1187 | * value carried in the HEARTBEAT ACK chunk. | |
1188 | * | |
1189 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1190 | * | |
1191 | * Inputs | |
1192 | * (endpoint, asoc, chunk) | |
1193 | * | |
1194 | * Outputs | |
1195 | * (asoc, reply_msg, msg_up, timers, counters) | |
1196 | * | |
1197 | * The return value is the disposition of the chunk. | |
1198 | */ | |
172a1599 XL |
1199 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1200 | const struct sctp_endpoint *ep, | |
1201 | const struct sctp_association *asoc, | |
1202 | const union sctp_subtype type, | |
1203 | void *arg, | |
1204 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1205 | { |
edf903f8 | 1206 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1207 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1208 | struct sctp_transport *link; |
1da177e4 | 1209 | unsigned long max_interval; |
edf903f8 | 1210 | union sctp_addr from_addr; |
1da177e4 LT |
1211 | |
1212 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1213 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1214 | |
1215 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1216 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1217 | sizeof(*hbinfo))) |
24cb81a6 | 1218 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1219 | commands); |
1220 | ||
edf903f8 | 1221 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1222 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1223 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1224 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1225 | |
1da177e4 | 1226 | from_addr = hbinfo->daddr; |
63de08f4 | 1227 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1228 | |
1229 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1230 | if (unlikely(!link)) { |
1231 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1232 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1233 | __func__, | |
1234 | asoc, | |
1235 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1236 | } else { |
e87cc472 JP |
1237 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1238 | __func__, | |
1239 | asoc, | |
1240 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1241 | } |
1da177e4 LT |
1242 | return SCTP_DISPOSITION_DISCARD; |
1243 | } | |
1244 | ||
ad8fec17 SS |
1245 | /* Validate the 64-bit random nonce. */ |
1246 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1247 | return SCTP_DISPOSITION_DISCARD; | |
1248 | ||
52ccb8e9 | 1249 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1250 | |
1251 | /* Check if the timestamp looks valid. */ | |
1252 | if (time_after(hbinfo->sent_at, jiffies) || | |
1253 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1254 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1255 | "for transport:%p\n", __func__, link); | |
1256 | ||
1da177e4 LT |
1257 | return SCTP_DISPOSITION_DISCARD; |
1258 | } | |
1259 | ||
1260 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1261 | * the HEARTBEAT should clear the error counter of the | |
1262 | * destination transport address to which the HEARTBEAT was | |
1263 | * sent and mark the destination transport address as active if | |
1264 | * it is not so marked. | |
1265 | */ | |
1266 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1267 | ||
1268 | return SCTP_DISPOSITION_CONSUME; | |
1269 | } | |
1270 | ||
1271 | /* Helper function to send out an abort for the restart | |
1272 | * condition. | |
1273 | */ | |
2ce95503 | 1274 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1275 | struct sctp_chunk *init, |
a85bbeb2 | 1276 | struct sctp_cmd_seq *commands) |
1da177e4 | 1277 | { |
172a1599 | 1278 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1279 | union sctp_addr_param *addrparm; |
1280 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1281 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1282 | struct sctp_endpoint *ep; |
1283 | struct sctp_packet *pkt; | |
1284 | int len; | |
1da177e4 LT |
1285 | |
1286 | /* Build the error on the stack. We are way to malloc crazy | |
1287 | * throughout the code today. | |
1288 | */ | |
1289 | errhdr = (struct sctp_errhdr *)buffer; | |
1290 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1291 | ||
1292 | /* Copy into a parm format. */ | |
1293 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1294 | len += sizeof(*errhdr); |
1da177e4 LT |
1295 | |
1296 | errhdr->cause = SCTP_ERROR_RESTART; | |
1297 | errhdr->length = htons(len); | |
1298 | ||
1299 | /* Assign to the control socket. */ | |
2ce95503 | 1300 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1301 | |
1302 | /* Association is NULL since this may be a restart attack and we | |
1303 | * want to send back the attacker's vtag. | |
1304 | */ | |
24cb81a6 | 1305 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1306 | |
1307 | if (!pkt) | |
1308 | goto out; | |
1309 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1310 | ||
b01a2407 | 1311 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1312 | |
1313 | /* Discard the rest of the inbound packet. */ | |
1314 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1315 | ||
1316 | out: | |
1317 | /* Even if there is no memory, treat as a failure so | |
1318 | * the packet will get dropped. | |
1319 | */ | |
1320 | return 0; | |
1321 | } | |
1322 | ||
123031c0 JP |
1323 | static bool list_has_sctp_addr(const struct list_head *list, |
1324 | union sctp_addr *ipaddr) | |
1325 | { | |
1326 | struct sctp_transport *addr; | |
1327 | ||
1328 | list_for_each_entry(addr, list, transports) { | |
1329 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1330 | return true; | |
1331 | } | |
1332 | ||
1333 | return false; | |
1334 | } | |
1da177e4 LT |
1335 | /* A restart is occurring, check to make sure no new addresses |
1336 | * are being added as we may be under a takeover attack. | |
1337 | */ | |
1338 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1339 | const struct sctp_association *asoc, | |
1340 | struct sctp_chunk *init, | |
a85bbeb2 | 1341 | struct sctp_cmd_seq *commands) |
1da177e4 | 1342 | { |
2ce95503 | 1343 | struct net *net = sock_net(new_asoc->base.sk); |
123031c0 JP |
1344 | struct sctp_transport *new_addr; |
1345 | int ret = 1; | |
1da177e4 | 1346 | |
123031c0 | 1347 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1348 | * ... |
1349 | * Before responding the endpoint MUST check to see if the | |
1350 | * unexpected INIT adds new addresses to the association. If new | |
1351 | * addresses are added to the association, the endpoint MUST respond | |
1352 | * with an ABORT.. | |
1353 | */ | |
1354 | ||
1355 | /* Search through all current addresses and make sure | |
1356 | * we aren't adding any new ones. | |
1357 | */ | |
9dbc15f0 | 1358 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1359 | transports) { |
1360 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1361 | &new_addr->ipaddr)) { | |
2ce95503 | 1362 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1363 | commands); |
1364 | ret = 0; | |
1da177e4 | 1365 | break; |
123031c0 | 1366 | } |
1da177e4 LT |
1367 | } |
1368 | ||
1369 | /* Return success if all addresses were found. */ | |
123031c0 | 1370 | return ret; |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | /* Populate the verification/tie tags based on overlapping INIT | |
1374 | * scenario. | |
1375 | * | |
1376 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1377 | */ | |
1378 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1379 | const struct sctp_association *asoc) | |
1380 | { | |
1381 | switch (asoc->state) { | |
1382 | ||
1383 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1384 | ||
1385 | case SCTP_STATE_COOKIE_WAIT: | |
1386 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1387 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1388 | new_asoc->c.peer_ttag = 0; | |
1389 | break; | |
1390 | ||
1391 | case SCTP_STATE_COOKIE_ECHOED: | |
1392 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1393 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1394 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1395 | break; | |
1396 | ||
1397 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1398 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1399 | */ | |
1400 | default: | |
1401 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1402 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1403 | break; | |
3ff50b79 | 1404 | } |
1da177e4 LT |
1405 | |
1406 | /* Other parameters for the endpoint SHOULD be copied from the | |
1407 | * existing parameters of the association (e.g. number of | |
1408 | * outbound streams) into the INIT ACK and cookie. | |
1409 | */ | |
1410 | new_asoc->rwnd = asoc->rwnd; | |
1411 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1412 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1413 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1418 | * handling action. | |
1419 | * | |
1420 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1421 | * | |
1422 | * Returns value representing action to be taken. These action values | |
1423 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1424 | */ | |
1425 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1426 | const struct sctp_association *asoc) | |
1427 | { | |
1428 | /* In this case, the peer may have restarted. */ | |
1429 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1430 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1431 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1432 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1433 | return 'A'; | |
1434 | ||
1435 | /* Collision case B. */ | |
1436 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1437 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1438 | (0 == asoc->c.peer_vtag))) { | |
1439 | return 'B'; | |
1440 | } | |
1441 | ||
1442 | /* Collision case D. */ | |
1443 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1444 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1445 | return 'D'; | |
1446 | ||
1447 | /* Collision case C. */ | |
1448 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1449 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1450 | (0 == new_asoc->c.my_ttag) && | |
1451 | (0 == new_asoc->c.peer_ttag)) | |
1452 | return 'C'; | |
1453 | ||
1454 | /* No match to any of the special cases; discard this packet. */ | |
1455 | return 'E'; | |
1456 | } | |
1457 | ||
1458 | /* Common helper routine for both duplicate and simulataneous INIT | |
1459 | * chunk handling. | |
1460 | */ | |
172a1599 XL |
1461 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1462 | struct net *net, | |
1463 | const struct sctp_endpoint *ep, | |
1464 | const struct sctp_association *asoc, | |
1465 | const union sctp_subtype type, | |
1466 | void *arg, | |
1467 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1468 | { |
62e6b7e4 XL |
1469 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1470 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1471 | struct sctp_association *new_asoc; |
172a1599 | 1472 | enum sctp_disposition retval; |
1da177e4 | 1473 | struct sctp_packet *packet; |
1da177e4 LT |
1474 | int len; |
1475 | ||
2277c7cd RH |
1476 | /* Update socket peer label if first association. */ |
1477 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
1478 | chunk->skb)) | |
1479 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1480 | ||
1da177e4 LT |
1481 | /* 6.10 Bundling |
1482 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1483 | * SHUTDOWN COMPLETE with any other chunks. | |
1484 | * | |
1485 | * IG Section 2.11.2 | |
1486 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1487 | * enforce these rules by silently discarding an arriving packet | |
1488 | * with an INIT chunk that is bundled with other chunks. | |
1489 | */ | |
1490 | if (!chunk->singleton) | |
24cb81a6 | 1491 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 1492 | |
ba03b9ba XL |
1493 | /* Make sure that the INIT chunk has a valid length. */ |
1494 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) | |
1495 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1496 | ||
1da177e4 | 1497 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 1498 | * Tag. |
1da177e4 LT |
1499 | */ |
1500 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1501 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 | 1502 | |
1da177e4 | 1503 | /* Grab the INIT header. */ |
4ae70c08 | 1504 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1505 | |
1506 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1507 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1508 | |
1509 | /* Verify the INIT chunk before processing it. */ | |
1510 | err_chunk = NULL; | |
b14878cc | 1511 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1512 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1513 | &err_chunk)) { |
1514 | /* This chunk contains fatal error. It is to be discarded. | |
1515 | * Send an ABORT, with causes if there is any. | |
1516 | */ | |
1517 | if (err_chunk) { | |
24cb81a6 | 1518 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1519 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1520 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1521 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1522 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1523 | |
1524 | if (packet) { | |
1525 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1526 | SCTP_PACKET(packet)); | |
24cb81a6 | 1527 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1528 | retval = SCTP_DISPOSITION_CONSUME; |
1529 | } else { | |
1530 | retval = SCTP_DISPOSITION_NOMEM; | |
1531 | } | |
1532 | goto cleanup; | |
1533 | } else { | |
24cb81a6 | 1534 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1535 | commands); |
1536 | } | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * Other parameters for the endpoint SHOULD be copied from the | |
1541 | * existing parameters of the association (e.g. number of | |
1542 | * outbound streams) into the INIT ACK and cookie. | |
1543 | * FIXME: We are copying parameters from the endpoint not the | |
1544 | * association. | |
1545 | */ | |
1546 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1547 | if (!new_asoc) | |
1548 | goto nomem; | |
1549 | ||
409b95af VY |
1550 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1551 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1552 | goto nomem; | |
1553 | ||
1da177e4 LT |
1554 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1555 | * Verification Tag and Peers Verification tag into a reserved | |
1556 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1557 | */ | |
de6becdc | 1558 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1559 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1560 | GFP_ATOMIC)) |
1561 | goto nomem; | |
1da177e4 LT |
1562 | |
1563 | /* Make sure no new addresses are being added during the | |
1564 | * restart. Do not do this check for COOKIE-WAIT state, | |
1565 | * since there are no peer addresses to check against. | |
1566 | * Upon return an ABORT will have been sent if needed. | |
1567 | */ | |
1568 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1569 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1570 | commands)) { | |
1571 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1572 | goto nomem_retval; |
1da177e4 LT |
1573 | } |
1574 | } | |
1575 | ||
1576 | sctp_tietags_populate(new_asoc, asoc); | |
1577 | ||
1578 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1579 | ||
1580 | /* If there are errors need to be reported for unknown parameters, | |
1581 | * make sure to reserve enough room in the INIT ACK for them. | |
1582 | */ | |
1583 | len = 0; | |
1584 | if (err_chunk) { | |
1585 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1586 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1587 | } |
1588 | ||
1da177e4 LT |
1589 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1590 | if (!repl) | |
1591 | goto nomem; | |
1592 | ||
1593 | /* If there are errors need to be reported for unknown parameters, | |
1594 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1595 | * parameter. | |
1596 | */ | |
1597 | if (err_chunk) { | |
1598 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1599 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1600 | * error cause code for "unknown parameter" and the | |
1601 | * "Unrecognized parameter" type is the same, we can | |
1602 | * construct the parameters in INIT ACK by copying the | |
1603 | * ERROR causes over. | |
1604 | */ | |
62e6b7e4 | 1605 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1606 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1607 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1608 | /* Replace the cause code with the "Unrecognized parameter" |
1609 | * parameter type. | |
1610 | */ | |
1611 | sctp_addto_chunk(repl, len, unk_param); | |
1612 | } | |
1613 | ||
1614 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1615 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1616 | ||
1617 | /* | |
1618 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1619 | * "Z" MUST NOT allocate any resources for this new association. | |
1620 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1621 | */ | |
1622 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1623 | retval = SCTP_DISPOSITION_CONSUME; | |
1624 | ||
df7deeb5 VY |
1625 | return retval; |
1626 | ||
1627 | nomem: | |
1628 | retval = SCTP_DISPOSITION_NOMEM; | |
1629 | nomem_retval: | |
1630 | if (new_asoc) | |
1631 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1632 | cleanup: |
1633 | if (err_chunk) | |
1634 | sctp_chunk_free(err_chunk); | |
1635 | return retval; | |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | /* | |
25985edc | 1639 | * Handle simultaneous INIT. |
1da177e4 LT |
1640 | * This means we started an INIT and then we got an INIT request from |
1641 | * our peer. | |
1642 | * | |
1643 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1644 | * This usually indicates an initialization collision, i.e., each | |
1645 | * endpoint is attempting, at about the same time, to establish an | |
1646 | * association with the other endpoint. | |
1647 | * | |
1648 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1649 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1650 | * sent in its original INIT chunk (including its Verification Tag, | |
1651 | * unchanged). These original parameters are combined with those from the | |
1652 | * newly received INIT chunk. The endpoint shall also generate a State | |
1653 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1654 | * INIT to calculate the State Cookie. | |
1655 | * | |
1656 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1657 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1658 | * destroyed. The normal procedures for handling State Cookies when | |
1659 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1660 | * | |
1661 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1662 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1663 | * section 5.2.2 for a description of the Tie-Tags). | |
1664 | * | |
1665 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1666 | * verification tag, so we skip the check. | |
1667 | * | |
1668 | * Inputs | |
1669 | * (endpoint, asoc, chunk) | |
1670 | * | |
1671 | * Outputs | |
1672 | * (asoc, reply_msg, msg_up, timers, counters) | |
1673 | * | |
1674 | * The return value is the disposition of the chunk. | |
1675 | */ | |
172a1599 XL |
1676 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1677 | struct net *net, | |
1678 | const struct sctp_endpoint *ep, | |
1679 | const struct sctp_association *asoc, | |
1680 | const union sctp_subtype type, | |
1681 | void *arg, | |
1682 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1683 | { |
1684 | /* Call helper to do the real work for both simulataneous and | |
1685 | * duplicate INIT chunk handling. | |
1686 | */ | |
24cb81a6 | 1687 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1688 | } |
1689 | ||
1690 | /* | |
1691 | * Handle duplicated INIT messages. These are usually delayed | |
1692 | * restransmissions. | |
1693 | * | |
1694 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1695 | * COOKIE-ECHOED and COOKIE-WAIT | |
1696 | * | |
1697 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1698 | * this association, the endpoint shall generate an INIT ACK with a | |
1699 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1700 | * current Verification Tag and peer's Verification Tag into a reserved | |
1701 | * place within the state cookie. We shall refer to these locations as | |
1702 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1703 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1704 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1705 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1706 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1707 | * existing parameters of the association (e.g. number of outbound | |
1708 | * streams) into the INIT ACK and cookie. | |
1709 | * | |
1710 | * After sending out the INIT ACK, the endpoint shall take no further | |
1711 | * actions, i.e., the existing association, including its current state, | |
1712 | * and the corresponding TCB MUST NOT be changed. | |
1713 | * | |
1714 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1715 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1716 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1717 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1718 | * State Cookie are populated as specified in section 5.2.1. | |
1719 | * | |
1720 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1721 | * what the verification tag could be, so we ignore it. | |
1722 | * | |
1723 | * Inputs | |
1724 | * (endpoint, asoc, chunk) | |
1725 | * | |
1726 | * Outputs | |
1727 | * (asoc, reply_msg, msg_up, timers, counters) | |
1728 | * | |
1729 | * The return value is the disposition of the chunk. | |
1730 | */ | |
172a1599 XL |
1731 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1732 | struct net *net, | |
24cb81a6 | 1733 | const struct sctp_endpoint *ep, |
1da177e4 | 1734 | const struct sctp_association *asoc, |
bfc6f827 | 1735 | const union sctp_subtype type, |
1da177e4 | 1736 | void *arg, |
a85bbeb2 | 1737 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
1738 | { |
1739 | /* Call helper to do the real work for both simulataneous and | |
1740 | * duplicate INIT chunk handling. | |
1741 | */ | |
24cb81a6 | 1742 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1743 | } |
1744 | ||
1745 | ||
610ab73a VY |
1746 | /* |
1747 | * Unexpected INIT-ACK handler. | |
1748 | * | |
1749 | * Section 5.2.3 | |
1750 | * If an INIT ACK received by an endpoint in any state other than the | |
1751 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1752 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1753 | * duplicated INIT chunk. | |
1754 | */ | |
172a1599 XL |
1755 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1756 | struct net *net, | |
1757 | const struct sctp_endpoint *ep, | |
1758 | const struct sctp_association *asoc, | |
1759 | const union sctp_subtype type, | |
1760 | void *arg, | |
1761 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1762 | { |
1763 | /* Per the above section, we'll discard the chunk if we have an | |
1764 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1765 | */ | |
2ce95503 | 1766 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1767 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1768 | else |
24cb81a6 | 1769 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1770 | } |
1da177e4 LT |
1771 | |
1772 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') | |
1773 | * | |
1774 | * Section 5.2.4 | |
1775 | * A) In this case, the peer may have restarted. | |
1776 | */ | |
172a1599 XL |
1777 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1778 | struct net *net, | |
24cb81a6 | 1779 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1780 | const struct sctp_association *asoc, |
1781 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1782 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1783 | struct sctp_association *new_asoc) |
1784 | { | |
01a992be | 1785 | struct sctp_init_chunk *peer_init; |
172a1599 | 1786 | enum sctp_disposition disposition; |
1da177e4 LT |
1787 | struct sctp_ulpevent *ev; |
1788 | struct sctp_chunk *repl; | |
1789 | struct sctp_chunk *err; | |
1da177e4 LT |
1790 | |
1791 | /* new_asoc is a brand-new association, so these are not yet | |
1792 | * side effects--it is safe to run them here. | |
1793 | */ | |
1794 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1795 | ||
de6becdc | 1796 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1797 | GFP_ATOMIC)) |
1798 | goto nomem; | |
1799 | ||
4842a08f XL |
1800 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1801 | goto nomem; | |
1802 | ||
59d8d443 XL |
1803 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1804 | return SCTP_DISPOSITION_DISCARD; | |
1805 | ||
1da177e4 LT |
1806 | /* Make sure no new addresses are being added during the |
1807 | * restart. Though this is a pretty complicated attack | |
1808 | * since you'd have to get inside the cookie. | |
1809 | */ | |
59d8d443 | 1810 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) |
1da177e4 | 1811 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1812 | |
1813 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1814 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1815 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1816 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1817 | * its peer. | |
1818 | */ | |
1819 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
ba03b9ba XL |
1820 | disposition = __sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1821 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), | |
1822 | chunk, commands); | |
1da177e4 LT |
1823 | if (SCTP_DISPOSITION_NOMEM == disposition) |
1824 | goto nomem; | |
1825 | ||
1826 | err = sctp_make_op_error(asoc, chunk, | |
1827 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1828 | NULL, 0, 0); |
1da177e4 LT |
1829 | if (err) |
1830 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1831 | SCTP_CHUNK(err)); | |
1832 | ||
1833 | return SCTP_DISPOSITION_CONSUME; | |
1834 | } | |
1835 | ||
a000c01e WY |
1836 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1837 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1838 | */ |
a000c01e WY |
1839 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1840 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1841 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1842 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1843 | ||
a000c01e WY |
1844 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1845 | * and ASCONF-ACK cache. | |
1846 | */ | |
1847 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1848 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1849 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1850 | ||
99502ee7 XL |
1851 | /* Update the content of current association. */ |
1852 | if (sctp_assoc_update((struct sctp_association *)asoc, new_asoc)) { | |
1853 | struct sctp_chunk *abort; | |
1854 | ||
1855 | abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr)); | |
1856 | if (abort) { | |
1857 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
1858 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1859 | } | |
1860 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
1861 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1862 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
1863 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1864 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1865 | goto nomem; | |
1866 | } | |
1867 | ||
1868 | repl = sctp_make_cookie_ack(asoc, chunk); | |
1da177e4 LT |
1869 | if (!repl) |
1870 | goto nomem; | |
1871 | ||
1da177e4 LT |
1872 | /* Report association restart to upper layer. */ |
1873 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
99502ee7 XL |
1874 | asoc->c.sinit_num_ostreams, |
1875 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 1876 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1877 | if (!ev) |
1878 | goto nomem_ev; | |
1879 | ||
1880 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
432902b7 JL |
1881 | if ((sctp_state(asoc, SHUTDOWN_PENDING) || |
1882 | sctp_state(asoc, SHUTDOWN_SENT)) && | |
bdf6fa52 VY |
1883 | (sctp_sstate(asoc->base.sk, CLOSING) || |
1884 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
432902b7 JL |
1885 | /* If the socket has been closed by user, don't |
1886 | * transition to ESTABLISHED. Instead trigger SHUTDOWN | |
1887 | * bundled with COOKIE_ACK. | |
bdf6fa52 VY |
1888 | */ |
1889 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1890 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
04992bfd | 1891 | SCTP_ST_CHUNK(0), repl, |
bdf6fa52 VY |
1892 | commands); |
1893 | } else { | |
1894 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1895 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1896 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1897 | } | |
1da177e4 LT |
1898 | return SCTP_DISPOSITION_CONSUME; |
1899 | ||
1900 | nomem_ev: | |
1901 | sctp_chunk_free(repl); | |
1902 | nomem: | |
1903 | return SCTP_DISPOSITION_NOMEM; | |
1904 | } | |
1905 | ||
1906 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1907 | * | |
1908 | * Section 5.2.4 | |
1909 | * B) In this case, both sides may be attempting to start an association | |
1910 | * at about the same time but the peer endpoint started its INIT | |
1911 | * after responding to the local endpoint's INIT | |
1912 | */ | |
1913 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1914 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1915 | struct net *net, | |
24cb81a6 | 1916 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1917 | const struct sctp_association *asoc, |
1918 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1919 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1920 | struct sctp_association *new_asoc) |
1921 | { | |
01a992be | 1922 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1923 | struct sctp_chunk *repl; |
1924 | ||
1925 | /* new_asoc is a brand-new association, so these are not yet | |
1926 | * side effects--it is safe to run them here. | |
1927 | */ | |
1928 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1929 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1930 | GFP_ATOMIC)) |
1931 | goto nomem; | |
1932 | ||
4842a08f XL |
1933 | if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC)) |
1934 | goto nomem; | |
1935 | ||
59d8d443 XL |
1936 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1937 | return SCTP_DISPOSITION_DISCARD; | |
1938 | ||
1da177e4 LT |
1939 | /* Update the content of current association. */ |
1940 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1941 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1942 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1dec8a15 XL |
1943 | if (asoc->state < SCTP_STATE_ESTABLISHED) |
1944 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1945 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1946 | ||
1947 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
1948 | if (!repl) | |
1949 | goto nomem; | |
1950 | ||
1951 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
1952 | |
1953 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1954 | * | |
1955 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
1956 | * send the Communication Up notification to the SCTP user | |
1957 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
1958 | * |
1959 | * Sadly, this needs to be implemented as a side-effect, because | |
1960 | * we are not guaranteed to have set the association id of the real | |
1961 | * association and so these notifications need to be delayed until | |
1962 | * the association id is allocated. | |
1da177e4 | 1963 | */ |
1da177e4 | 1964 | |
07d93967 | 1965 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
1966 | |
1967 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1968 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 1969 | * delivers this notification to inform the application that of the |
0f3fffd8 | 1970 | * peers requested adaptation layer. |
07d93967 VY |
1971 | * |
1972 | * This also needs to be done as a side effect for the same reason as | |
1973 | * above. | |
1da177e4 | 1974 | */ |
07d93967 VY |
1975 | if (asoc->peer.adaptation_ind) |
1976 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 | 1977 | |
30f6ebf6 XL |
1978 | if (!asoc->peer.auth_capable) |
1979 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_NO_AUTH, SCTP_NULL()); | |
1980 | ||
1da177e4 LT |
1981 | return SCTP_DISPOSITION_CONSUME; |
1982 | ||
1da177e4 LT |
1983 | nomem: |
1984 | return SCTP_DISPOSITION_NOMEM; | |
1985 | } | |
1986 | ||
1987 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
1988 | * | |
1989 | * Section 5.2.4 | |
1990 | * C) In this case, the local endpoint's cookie has arrived late. | |
1991 | * Before it arrived, the local endpoint sent an INIT and received an | |
1992 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
1993 | * but a new tag of its own. | |
1994 | */ | |
1995 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1996 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
1997 | struct net *net, | |
24cb81a6 | 1998 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1999 | const struct sctp_association *asoc, |
2000 | struct sctp_chunk *chunk, | |
a85bbeb2 | 2001 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
2002 | struct sctp_association *new_asoc) |
2003 | { | |
2004 | /* The cookie should be silently discarded. | |
2005 | * The endpoint SHOULD NOT change states and should leave | |
2006 | * any timers running. | |
2007 | */ | |
2008 | return SCTP_DISPOSITION_DISCARD; | |
2009 | } | |
2010 | ||
2011 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
2012 | * | |
2013 | * Section 5.2.4 | |
2014 | * | |
2015 | * D) When both local and remote tags match the endpoint should always | |
2016 | * enter the ESTABLISHED state, if it has not already done so. | |
2017 | */ | |
2018 | /* This case represents an initialization collision. */ | |
172a1599 XL |
2019 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
2020 | struct net *net, | |
24cb81a6 | 2021 | const struct sctp_endpoint *ep, |
1da177e4 LT |
2022 | const struct sctp_association *asoc, |
2023 | struct sctp_chunk *chunk, | |
a85bbeb2 | 2024 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
2025 | struct sctp_association *new_asoc) |
2026 | { | |
30f6ebf6 | 2027 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL, *auth_ev = NULL; |
1da177e4 LT |
2028 | struct sctp_chunk *repl; |
2029 | ||
2030 | /* Clarification from Implementor's Guide: | |
2031 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
2032 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
2033 | * It should stop any cookie timer that may be running and send | |
2034 | * a COOKIE ACK. | |
1da177e4 LT |
2035 | */ |
2036 | ||
59d8d443 XL |
2037 | if (!sctp_auth_chunk_verify(net, chunk, asoc)) |
2038 | return SCTP_DISPOSITION_DISCARD; | |
2039 | ||
1da177e4 LT |
2040 | /* Don't accidentally move back into established state. */ |
2041 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
2042 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2043 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2044 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2045 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 2046 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
2047 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
2048 | SCTP_NULL()); | |
2049 | ||
2050 | /* RFC 2960 5.1 Normal Establishment of an Association | |
2051 | * | |
2052 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
2053 | * to send the Communication Up notification to the | |
2054 | * SCTP user upon reception of a valid COOKIE | |
2055 | * ECHO chunk. | |
2056 | */ | |
df7deeb5 | 2057 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 2058 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
2059 | asoc->c.sinit_num_ostreams, |
2060 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 2061 | NULL, GFP_ATOMIC); |
1da177e4 LT |
2062 | if (!ev) |
2063 | goto nomem; | |
1da177e4 LT |
2064 | |
2065 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 2066 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 2067 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 2068 | * that of the peers requested adaptation layer. |
1da177e4 | 2069 | */ |
0f3fffd8 ISJ |
2070 | if (asoc->peer.adaptation_ind) { |
2071 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 2072 | GFP_ATOMIC); |
df7deeb5 | 2073 | if (!ai_ev) |
1da177e4 LT |
2074 | goto nomem; |
2075 | ||
1da177e4 | 2076 | } |
30f6ebf6 XL |
2077 | |
2078 | if (!asoc->peer.auth_capable) { | |
2079 | auth_ev = sctp_ulpevent_make_authkey(asoc, 0, | |
2080 | SCTP_AUTH_NO_AUTH, | |
2081 | GFP_ATOMIC); | |
2082 | if (!auth_ev) | |
2083 | goto nomem; | |
2084 | } | |
1da177e4 | 2085 | } |
1da177e4 | 2086 | |
46e16d4b | 2087 | repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4 LT |
2088 | if (!repl) |
2089 | goto nomem; | |
2090 | ||
2e3216cd VY |
2091 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2092 | ||
df7deeb5 VY |
2093 | if (ev) |
2094 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2095 | SCTP_ULPEVENT(ev)); | |
2096 | if (ai_ev) | |
2097 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2098 | SCTP_ULPEVENT(ai_ev)); | |
30f6ebf6 XL |
2099 | if (auth_ev) |
2100 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2101 | SCTP_ULPEVENT(auth_ev)); | |
df7deeb5 | 2102 | |
1da177e4 LT |
2103 | return SCTP_DISPOSITION_CONSUME; |
2104 | ||
2105 | nomem: | |
30f6ebf6 XL |
2106 | if (auth_ev) |
2107 | sctp_ulpevent_free(auth_ev); | |
df7deeb5 VY |
2108 | if (ai_ev) |
2109 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2110 | if (ev) |
2111 | sctp_ulpevent_free(ev); | |
2112 | return SCTP_DISPOSITION_NOMEM; | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2117 | * chunk was retransmitted and then delayed in the network. | |
2118 | * | |
2119 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2120 | * | |
2121 | * Verification Tag: None. Do cookie validation. | |
2122 | * | |
2123 | * Inputs | |
2124 | * (endpoint, asoc, chunk) | |
2125 | * | |
2126 | * Outputs | |
2127 | * (asoc, reply_msg, msg_up, timers, counters) | |
2128 | * | |
2129 | * The return value is the disposition of the chunk. | |
2130 | */ | |
172a1599 XL |
2131 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2132 | struct net *net, | |
24cb81a6 | 2133 | const struct sctp_endpoint *ep, |
1da177e4 | 2134 | const struct sctp_association *asoc, |
bfc6f827 | 2135 | const union sctp_subtype type, |
1da177e4 | 2136 | void *arg, |
a85bbeb2 | 2137 | struct sctp_cmd_seq *commands) |
1da177e4 | 2138 | { |
1da177e4 | 2139 | struct sctp_association *new_asoc; |
172a1599 XL |
2140 | struct sctp_chunk *chunk = arg; |
2141 | enum sctp_disposition retval; | |
2142 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2143 | int error = 0; |
2144 | char action; | |
1da177e4 LT |
2145 | |
2146 | /* Make sure that the chunk has a valid length from the protocol | |
2147 | * perspective. In this case check to make sure we have at least | |
2148 | * enough for the chunk header. Cookie length verification is | |
2149 | * done later. | |
2150 | */ | |
b16b5ddc XL |
2151 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) { |
2152 | if (!sctp_vtag_verify(chunk, asoc)) | |
2153 | asoc = NULL; | |
2154 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, commands); | |
2155 | } | |
1da177e4 LT |
2156 | |
2157 | /* "Decode" the chunk. We have no optional parameters so we | |
2158 | * are in good shape. | |
2159 | */ | |
d808ad9a | 2160 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2161 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2162 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2163 | goto nomem; |
1da177e4 LT |
2164 | |
2165 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2166 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2167 | * current association, consider the State Cookie valid even if | |
2168 | * the lifespan is exceeded. | |
2169 | */ | |
2170 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2171 | &err_chk_p); | |
2172 | ||
2173 | /* FIXME: | |
2174 | * If the re-build failed, what is the proper error path | |
2175 | * from here? | |
2176 | * | |
2177 | * [We should abort the association. --piggy] | |
2178 | */ | |
2179 | if (!new_asoc) { | |
2180 | /* FIXME: Several errors are possible. A bad cookie should | |
2181 | * be silently discarded, but think about logging it too. | |
2182 | */ | |
2183 | switch (error) { | |
2184 | case -SCTP_IERROR_NOMEM: | |
2185 | goto nomem; | |
2186 | ||
2187 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2188 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2189 | err_chk_p); |
24cb81a6 | 2190 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2191 | case -SCTP_IERROR_BAD_SIG: |
2192 | default: | |
24cb81a6 | 2193 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2194 | } |
1da177e4 LT |
2195 | } |
2196 | ||
2277c7cd RH |
2197 | /* Update socket peer label if first association. */ |
2198 | if (security_sctp_assoc_request((struct sctp_endpoint *)ep, | |
382ba2fd NE |
2199 | chunk->skb)) { |
2200 | sctp_association_free(new_asoc); | |
2277c7cd | 2201 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
382ba2fd | 2202 | } |
2277c7cd | 2203 | |
7e062977 XL |
2204 | /* Set temp so that it won't be added into hashtable */ |
2205 | new_asoc->temp = 1; | |
2206 | ||
1da177e4 LT |
2207 | /* Compare the tie_tag in cookie with the verification tag of |
2208 | * current association. | |
2209 | */ | |
2210 | action = sctp_tietags_compare(new_asoc, asoc); | |
2211 | ||
2212 | switch (action) { | |
2213 | case 'A': /* Association restart. */ | |
24cb81a6 | 2214 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2215 | new_asoc); |
2216 | break; | |
2217 | ||
2218 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2219 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2220 | new_asoc); |
2221 | break; | |
2222 | ||
2223 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2224 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2225 | new_asoc); |
2226 | break; | |
2227 | ||
2228 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2229 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2230 | new_asoc); |
2231 | break; | |
2232 | ||
2233 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2234 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2235 | break; |
3ff50b79 | 2236 | } |
1da177e4 LT |
2237 | |
2238 | /* Delete the tempory new association. */ | |
f2815633 | 2239 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2240 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2241 | ||
d5ccd496 MM |
2242 | /* Restore association pointer to provide SCTP command interpeter |
2243 | * with a valid context in case it needs to manipulate | |
2244 | * the queues */ | |
2245 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2246 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2247 | ||
1da177e4 LT |
2248 | return retval; |
2249 | ||
2250 | nomem: | |
2251 | return SCTP_DISPOSITION_NOMEM; | |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2256 | * | |
2257 | * See sctp_sf_do_9_1_abort(). | |
2258 | */ | |
172a1599 XL |
2259 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2260 | struct net *net, | |
2261 | const struct sctp_endpoint *ep, | |
2262 | const struct sctp_association *asoc, | |
2263 | const union sctp_subtype type, | |
2264 | void *arg, | |
2265 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2266 | { |
2267 | struct sctp_chunk *chunk = arg; | |
2268 | ||
2269 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2270 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2271 | |
2272 | /* Make sure that the ABORT chunk has a valid length. | |
2273 | * Since this is an ABORT chunk, we have to discard it | |
2274 | * because of the following text: | |
2275 | * RFC 2960, Section 3.3.7 | |
2276 | * If an endpoint receives an ABORT with a format error or for an | |
2277 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2278 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2279 | * as we do not know its true length. So, to be safe, discard the |
2280 | * packet. | |
2281 | */ | |
441ae65a | 2282 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2283 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2284 | |
75205f47 VY |
2285 | /* ADD-IP: Special case for ABORT chunks |
2286 | * F4) One special consideration is that ABORT Chunks arriving | |
2287 | * destined to the IP address being deleted MUST be | |
2288 | * ignored (see Section 5.3.1 for further details). | |
2289 | */ | |
2290 | if (SCTP_ADDR_DEL == | |
2291 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
e782ed66 | 2292 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
75205f47 | 2293 | |
f8b6b19c XL |
2294 | if (!sctp_err_chunk_valid(chunk)) |
2295 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2296 | ||
24cb81a6 | 2297 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | /* | |
2301 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2302 | * | |
2303 | * See sctp_sf_do_9_1_abort(). | |
2304 | */ | |
172a1599 XL |
2305 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2306 | struct net *net, | |
24cb81a6 | 2307 | const struct sctp_endpoint *ep, |
1da177e4 | 2308 | const struct sctp_association *asoc, |
bfc6f827 | 2309 | const union sctp_subtype type, |
1da177e4 | 2310 | void *arg, |
a85bbeb2 | 2311 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2312 | { |
2313 | struct sctp_chunk *chunk = arg; | |
2314 | ||
2315 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2316 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2317 | |
2318 | /* Make sure that the ABORT chunk has a valid length. | |
2319 | * Since this is an ABORT chunk, we have to discard it | |
2320 | * because of the following text: | |
2321 | * RFC 2960, Section 3.3.7 | |
2322 | * If an endpoint receives an ABORT with a format error or for an | |
2323 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2324 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2325 | * as we do not know its true length. So, to be safe, discard the |
2326 | * packet. | |
2327 | */ | |
441ae65a | 2328 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2329 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2330 | |
75205f47 VY |
2331 | /* ADD-IP: Special case for ABORT chunks |
2332 | * F4) One special consideration is that ABORT Chunks arriving | |
2333 | * destined to the IP address being deleted MUST be | |
2334 | * ignored (see Section 5.3.1 for further details). | |
2335 | */ | |
2336 | if (SCTP_ADDR_DEL == | |
2337 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
e782ed66 | 2338 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
75205f47 | 2339 | |
f8b6b19c XL |
2340 | if (!sctp_err_chunk_valid(chunk)) |
2341 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2342 | ||
1da177e4 LT |
2343 | /* Stop the T2-shutdown timer. */ |
2344 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2345 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2346 | ||
2347 | /* Stop the T5-shutdown guard timer. */ | |
2348 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2349 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2350 | ||
24cb81a6 | 2351 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2352 | } |
2353 | ||
2354 | /* | |
2355 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2356 | * | |
2357 | * See sctp_sf_do_9_1_abort(). | |
2358 | */ | |
172a1599 XL |
2359 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2360 | struct net *net, | |
2361 | const struct sctp_endpoint *ep, | |
2362 | const struct sctp_association *asoc, | |
2363 | const union sctp_subtype type, | |
2364 | void *arg, | |
2365 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2366 | { |
2367 | /* The same T2 timer, so we should be able to use | |
2368 | * common function with the SHUTDOWN-SENT state. | |
2369 | */ | |
24cb81a6 | 2370 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2371 | } |
2372 | ||
2373 | /* | |
2374 | * Handle an Error received in COOKIE_ECHOED state. | |
2375 | * | |
2376 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2377 | * be ignored. | |
2378 | * | |
2379 | * Inputs | |
2380 | * (endpoint, asoc, chunk) | |
2381 | * | |
2382 | * Outputs | |
2383 | * (asoc, reply_msg, msg_up, timers, counters) | |
2384 | * | |
2385 | * The return value is the disposition of the chunk. | |
2386 | */ | |
172a1599 XL |
2387 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2388 | struct net *net, | |
24cb81a6 | 2389 | const struct sctp_endpoint *ep, |
1da177e4 | 2390 | const struct sctp_association *asoc, |
bfc6f827 | 2391 | const union sctp_subtype type, |
1da177e4 | 2392 | void *arg, |
a85bbeb2 | 2393 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2394 | { |
2395 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2396 | struct sctp_errhdr *err; |
1da177e4 LT |
2397 | |
2398 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2399 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2400 | |
2401 | /* Make sure that the ERROR chunk has a valid length. | |
2402 | * The parameter walking depends on this as well. | |
2403 | */ | |
87caeba7 | 2404 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2405 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2406 | commands); |
2407 | ||
2408 | /* Process the error here */ | |
2409 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2410 | * parms are emitted, this will have to change to handle multiple | |
2411 | * errors. | |
2412 | */ | |
2413 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2414 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2415 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2416 | arg, commands); |
2417 | } | |
2418 | ||
2419 | /* It is possible to have malformed error causes, and that | |
2420 | * will cause us to end the walk early. However, since | |
2421 | * we are discarding the packet, there should be no adverse | |
2422 | * affects. | |
2423 | */ | |
24cb81a6 | 2424 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2425 | } |
2426 | ||
2427 | /* | |
2428 | * Handle a Stale COOKIE Error | |
2429 | * | |
2430 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2431 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2432 | * one of the following three alternatives. | |
2433 | * ... | |
2434 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2435 | * Preservative parameter requesting an extension to the lifetime of | |
2436 | * the State Cookie. When calculating the time extension, an | |
2437 | * implementation SHOULD use the RTT information measured based on the | |
2438 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2439 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2440 | * lifetimes making the endpoint more subject to a replay attack. | |
2441 | * | |
2442 | * Verification Tag: Not explicit, but safe to ignore. | |
2443 | * | |
2444 | * Inputs | |
2445 | * (endpoint, asoc, chunk) | |
2446 | * | |
2447 | * Outputs | |
2448 | * (asoc, reply_msg, msg_up, timers, counters) | |
2449 | * | |
2450 | * The return value is the disposition of the chunk. | |
2451 | */ | |
172a1599 XL |
2452 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2453 | struct net *net, | |
2454 | const struct sctp_endpoint *ep, | |
2455 | const struct sctp_association *asoc, | |
2456 | const union sctp_subtype type, | |
2457 | void *arg, | |
2458 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2459 | { |
3f7a87d2 | 2460 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2461 | struct sctp_chunk *chunk = arg, *reply; |
2462 | struct sctp_cookie_preserve_param bht; | |
2463 | struct sctp_bind_addr *bp; | |
d8238d9d | 2464 | struct sctp_errhdr *err; |
365ddb65 | 2465 | u32 stale; |
1da177e4 | 2466 | |
81845c21 | 2467 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2468 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2469 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2470 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2471 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2472 | return SCTP_DISPOSITION_DELETE_TCB; |
2473 | } | |
2474 | ||
d8238d9d | 2475 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2476 | |
2477 | /* When calculating the time extension, an implementation | |
2478 | * SHOULD use the RTT information measured based on the | |
2479 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2480 | * more than 1 second beyond the measured RTT, due to long | |
2481 | * State Cookie lifetimes making the endpoint more subject to | |
2482 | * a replay attack. | |
2483 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2484 | * Suggested Cookie Life-span Increment's unit is msec. | |
2485 | * (1/1000 sec) | |
2486 | * In general, if you use the suggested cookie life, the value | |
2487 | * found in the field of measure of staleness should be doubled | |
2488 | * to give ample time to retransmit the new cookie and thus | |
2489 | * yield a higher probability of success on the reattempt. | |
2490 | */ | |
d8238d9d | 2491 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2492 | stale = (stale * 2) / 1000; |
2493 | ||
2494 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2495 | bht.param_hdr.length = htons(sizeof(bht)); | |
2496 | bht.lifespan_increment = htonl(stale); | |
2497 | ||
2498 | /* Build that new INIT chunk. */ | |
2499 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2500 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2501 | if (!reply) | |
2502 | goto nomem; | |
2503 | ||
2504 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2505 | ||
2506 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2507 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2508 | ||
2509 | /* Stop pending T3-rtx and heartbeat timers */ | |
2510 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2511 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2512 | ||
2513 | /* Delete non-primary peer ip addresses since we are transitioning | |
2514 | * back to the COOKIE-WAIT state | |
2515 | */ | |
2516 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2517 | ||
d808ad9a YH |
2518 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2519 | * resend | |
1da177e4 | 2520 | */ |
b6157d8e | 2521 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2522 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2523 | ||
2524 | /* Cast away the const modifier, as we want to just | |
2525 | * rerun it through as a sideffect. | |
2526 | */ | |
3f7a87d2 | 2527 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2528 | |
2529 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2530 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2531 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2532 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2533 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2534 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2535 | ||
2536 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2537 | ||
2538 | return SCTP_DISPOSITION_CONSUME; | |
2539 | ||
2540 | nomem: | |
2541 | return SCTP_DISPOSITION_NOMEM; | |
2542 | } | |
2543 | ||
2544 | /* | |
2545 | * Process an ABORT. | |
2546 | * | |
2547 | * Section: 9.1 | |
2548 | * After checking the Verification Tag, the receiving endpoint shall | |
2549 | * remove the association from its record, and shall report the | |
2550 | * termination to its upper layer. | |
2551 | * | |
2552 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2553 | * B) Rules for packet carrying ABORT: | |
2554 | * | |
2555 | * - The endpoint shall always fill in the Verification Tag field of the | |
2556 | * outbound packet with the destination endpoint's tag value if it | |
2557 | * is known. | |
2558 | * | |
2559 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2560 | * MUST follow the procedure described in Section 8.4. | |
2561 | * | |
2562 | * - The receiver MUST accept the packet if the Verification Tag | |
2563 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2564 | * receiver MUST silently discard the packet and take no further | |
2565 | * action. | |
2566 | * | |
2567 | * Inputs | |
2568 | * (endpoint, asoc, chunk) | |
2569 | * | |
2570 | * Outputs | |
2571 | * (asoc, reply_msg, msg_up, timers, counters) | |
2572 | * | |
2573 | * The return value is the disposition of the chunk. | |
2574 | */ | |
172a1599 XL |
2575 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2576 | struct net *net, | |
24cb81a6 | 2577 | const struct sctp_endpoint *ep, |
1da177e4 | 2578 | const struct sctp_association *asoc, |
bfc6f827 | 2579 | const union sctp_subtype type, |
1da177e4 | 2580 | void *arg, |
a85bbeb2 | 2581 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2582 | { |
2583 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2584 | |
2585 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2586 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2587 | |
2588 | /* Make sure that the ABORT chunk has a valid length. | |
2589 | * Since this is an ABORT chunk, we have to discard it | |
2590 | * because of the following text: | |
2591 | * RFC 2960, Section 3.3.7 | |
2592 | * If an endpoint receives an ABORT with a format error or for an | |
2593 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2594 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2595 | * as we do not know its true length. So, to be safe, discard the |
2596 | * packet. | |
2597 | */ | |
441ae65a | 2598 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2599 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2600 | |
75205f47 VY |
2601 | /* ADD-IP: Special case for ABORT chunks |
2602 | * F4) One special consideration is that ABORT Chunks arriving | |
2603 | * destined to the IP address being deleted MUST be | |
2604 | * ignored (see Section 5.3.1 for further details). | |
2605 | */ | |
2606 | if (SCTP_ADDR_DEL == | |
2607 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
e782ed66 | 2608 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
75205f47 | 2609 | |
f8b6b19c XL |
2610 | if (!sctp_err_chunk_valid(chunk)) |
2611 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2612 | ||
24cb81a6 | 2613 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2614 | } |
2615 | ||
172a1599 XL |
2616 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2617 | struct net *net, | |
24cb81a6 | 2618 | const struct sctp_endpoint *ep, |
75205f47 | 2619 | const struct sctp_association *asoc, |
bfc6f827 | 2620 | const union sctp_subtype type, |
75205f47 | 2621 | void *arg, |
a85bbeb2 | 2622 | struct sctp_cmd_seq *commands) |
75205f47 | 2623 | { |
172a1599 | 2624 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2625 | struct sctp_chunk *chunk = arg; |
95c96174 | 2626 | unsigned int len; |
75205f47 | 2627 | |
1da177e4 LT |
2628 | /* See if we have an error cause code in the chunk. */ |
2629 | len = ntohs(chunk->chunk_hdr->length); | |
f8b6b19c | 2630 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) |
d8238d9d | 2631 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2632 | |
8de8c873 | 2633 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2634 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2635 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2636 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2637 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2638 | |
2639 | return SCTP_DISPOSITION_ABORT; | |
2640 | } | |
2641 | ||
2642 | /* | |
2643 | * Process an ABORT. (COOKIE-WAIT state) | |
2644 | * | |
2645 | * See sctp_sf_do_9_1_abort() above. | |
2646 | */ | |
172a1599 XL |
2647 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2648 | struct net *net, | |
2649 | const struct sctp_endpoint *ep, | |
2650 | const struct sctp_association *asoc, | |
2651 | const union sctp_subtype type, | |
2652 | void *arg, | |
2653 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2654 | { |
172a1599 | 2655 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2656 | struct sctp_chunk *chunk = arg; |
95c96174 | 2657 | unsigned int len; |
1da177e4 LT |
2658 | |
2659 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2660 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2661 | |
2662 | /* Make sure that the ABORT chunk has a valid length. | |
2663 | * Since this is an ABORT chunk, we have to discard it | |
2664 | * because of the following text: | |
2665 | * RFC 2960, Section 3.3.7 | |
2666 | * If an endpoint receives an ABORT with a format error or for an | |
2667 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2668 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2669 | * as we do not know its true length. So, to be safe, discard the |
2670 | * packet. | |
2671 | */ | |
441ae65a | 2672 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2673 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2674 | |
2675 | /* See if we have an error cause code in the chunk. */ | |
2676 | len = ntohs(chunk->chunk_hdr->length); | |
2677 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2678 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2679 | |
24cb81a6 | 2680 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2681 | chunk->transport); |
1da177e4 LT |
2682 | } |
2683 | ||
2684 | /* | |
2685 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2686 | */ | |
172a1599 XL |
2687 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2688 | struct net *net, | |
24cb81a6 | 2689 | const struct sctp_endpoint *ep, |
1da177e4 | 2690 | const struct sctp_association *asoc, |
bfc6f827 | 2691 | const union sctp_subtype type, |
1da177e4 | 2692 | void *arg, |
a85bbeb2 | 2693 | struct sctp_cmd_seq *commands) |
1da177e4 | 2694 | { |
24cb81a6 | 2695 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2696 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2697 | (struct sctp_transport *)arg); |
1da177e4 LT |
2698 | } |
2699 | ||
2700 | /* | |
2701 | * Process an ABORT. (COOKIE-ECHOED state) | |
2702 | */ | |
172a1599 XL |
2703 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2704 | struct net *net, | |
2705 | const struct sctp_endpoint *ep, | |
2706 | const struct sctp_association *asoc, | |
2707 | const union sctp_subtype type, | |
2708 | void *arg, | |
2709 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2710 | { |
2711 | /* There is a single T1 timer, so we should be able to use | |
2712 | * common function with the COOKIE-WAIT state. | |
2713 | */ | |
24cb81a6 | 2714 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2715 | } |
2716 | ||
2717 | /* | |
2718 | * Stop T1 timer and abort association with "INIT failed". | |
2719 | * | |
2720 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2721 | */ | |
172a1599 XL |
2722 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2723 | struct net *net, | |
2724 | struct sctp_cmd_seq *commands, | |
2725 | __be16 error, int sk_err, | |
2726 | const struct sctp_association *asoc, | |
2727 | struct sctp_transport *transport) | |
1da177e4 | 2728 | { |
bb33381d DB |
2729 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2730 | ||
1da177e4 LT |
2731 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2732 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2733 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2734 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2735 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2736 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2737 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2738 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2739 | SCTP_PERR(error)); |
bb33381d | 2740 | |
3f7a87d2 | 2741 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2742 | } |
2743 | ||
2744 | /* | |
2745 | * sctp_sf_do_9_2_shut | |
2746 | * | |
2747 | * Section: 9.2 | |
2748 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2749 | * - enter the SHUTDOWN-RECEIVED state, | |
2750 | * | |
2751 | * - stop accepting new data from its SCTP user | |
2752 | * | |
2753 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2754 | * that all its outstanding DATA chunks have been received by the | |
2755 | * SHUTDOWN sender. | |
2756 | * | |
2757 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2758 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2759 | * subsequent SHUTDOWN chunks. | |
2760 | * | |
2761 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2762 | * receiver shall continue to follow normal data transmission | |
2763 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2764 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2765 | * new data from its SCTP user. | |
2766 | * | |
2767 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2768 | * | |
2769 | * Inputs | |
2770 | * (endpoint, asoc, chunk) | |
2771 | * | |
2772 | * Outputs | |
2773 | * (asoc, reply_msg, msg_up, timers, counters) | |
2774 | * | |
2775 | * The return value is the disposition of the chunk. | |
2776 | */ | |
172a1599 XL |
2777 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2778 | struct net *net, | |
2779 | const struct sctp_endpoint *ep, | |
2780 | const struct sctp_association *asoc, | |
2781 | const union sctp_subtype type, | |
2782 | void *arg, | |
2783 | struct sctp_cmd_seq *commands) | |
2784 | { | |
2785 | enum sctp_disposition disposition; | |
1da177e4 | 2786 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2787 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2788 | struct sctp_ulpevent *ev; |
df10eec4 | 2789 | __u32 ctsn; |
1da177e4 LT |
2790 | |
2791 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2792 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2793 | |
2794 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2795 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2796 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2797 | commands); |
2798 | ||
2799 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2800 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2801 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2802 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2803 | ctsn = ntohl(sdh->cum_tsn_ack); |
2804 | ||
a2f36eec | 2805 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2806 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2807 | asoc->ctsn_ack_point); | |
2808 | ||
a2f36eec WY |
2809 | return SCTP_DISPOSITION_DISCARD; |
2810 | } | |
2811 | ||
df10eec4 WY |
2812 | /* If Cumulative TSN Ack beyond the max tsn currently |
2813 | * send, terminating the association and respond to the | |
2814 | * sender with an ABORT. | |
2815 | */ | |
2816 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2817 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2818 | |
eb0e0076 SS |
2819 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2820 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2821 | * inform the application that it should cease sending data. | |
2822 | */ | |
2823 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2824 | if (!ev) { | |
2825 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2826 | goto out; |
eb0e0076 SS |
2827 | } |
2828 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2829 | ||
1da177e4 LT |
2830 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2831 | * - enter the SHUTDOWN-RECEIVED state, | |
2832 | * - stop accepting new data from its SCTP user | |
2833 | * | |
2834 | * [This is implicit in the new state.] | |
2835 | */ | |
2836 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2837 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2838 | disposition = SCTP_DISPOSITION_CONSUME; | |
2839 | ||
2840 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2841 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2842 | arg, commands); |
2843 | } | |
2844 | ||
2845 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2846 | goto out; | |
2847 | ||
2848 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2849 | * chunk, that all its outstanding DATA chunks have been | |
2850 | * received by the SHUTDOWN sender. | |
2851 | */ | |
2852 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2853 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2854 | |
1da177e4 LT |
2855 | out: |
2856 | return disposition; | |
2857 | } | |
2858 | ||
2e3f92da WY |
2859 | /* |
2860 | * sctp_sf_do_9_2_shut_ctsn | |
2861 | * | |
2862 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2863 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2864 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2865 | * MUST be processed. | |
2866 | */ | |
172a1599 XL |
2867 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2868 | struct net *net, | |
2869 | const struct sctp_endpoint *ep, | |
2870 | const struct sctp_association *asoc, | |
2871 | const union sctp_subtype type, | |
2872 | void *arg, | |
2873 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2874 | { |
2875 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2876 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2877 | __u32 ctsn; |
2e3f92da WY |
2878 | |
2879 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2880 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2881 | |
2882 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2883 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2884 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2885 | commands); |
2886 | ||
e61e4055 | 2887 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2888 | ctsn = ntohl(sdh->cum_tsn_ack); |
2889 | ||
2890 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2891 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2892 | asoc->ctsn_ack_point); | |
2893 | ||
a2f36eec WY |
2894 | return SCTP_DISPOSITION_DISCARD; |
2895 | } | |
2e3f92da WY |
2896 | |
2897 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2898 | * send, terminating the association and respond to the | |
2899 | * sender with an ABORT. | |
2900 | */ | |
a2f36eec | 2901 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2902 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2903 | |
2904 | /* verify, by checking the Cumulative TSN Ack field of the | |
2905 | * chunk, that all its outstanding DATA chunks have been | |
2906 | * received by the SHUTDOWN sender. | |
2907 | */ | |
2908 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2909 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2910 | ||
2911 | return SCTP_DISPOSITION_CONSUME; | |
2912 | } | |
2913 | ||
1da177e4 LT |
2914 | /* RFC 2960 9.2 |
2915 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2916 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2917 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2918 | * that belong to this association, it should discard the INIT chunk and | |
2919 | * retransmit the SHUTDOWN ACK chunk. | |
2920 | */ | |
ba03b9ba XL |
2921 | static enum sctp_disposition |
2922 | __sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep, | |
2923 | const struct sctp_association *asoc, | |
2924 | const union sctp_subtype type, void *arg, | |
2925 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2926 | { |
172a1599 | 2927 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2928 | struct sctp_chunk *reply; |
2929 | ||
ece25dfa | 2930 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2931 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2932 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2933 | commands); |
2934 | ||
1da177e4 LT |
2935 | /* Since we are not going to really process this INIT, there |
2936 | * is no point in verifying chunk boundries. Just generate | |
2937 | * the SHUTDOWN ACK. | |
2938 | */ | |
2939 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2940 | if (NULL == reply) | |
2941 | goto nomem; | |
2942 | ||
2943 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2944 | * the T2-SHUTDOWN timer. | |
2945 | */ | |
2946 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
2947 | ||
2948 | /* and restart the T2-shutdown timer. */ | |
2949 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
2950 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2951 | ||
2952 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2953 | ||
2954 | return SCTP_DISPOSITION_CONSUME; | |
2955 | nomem: | |
2956 | return SCTP_DISPOSITION_NOMEM; | |
2957 | } | |
2958 | ||
ba03b9ba XL |
2959 | enum sctp_disposition |
2960 | sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep, | |
2961 | const struct sctp_association *asoc, | |
2962 | const union sctp_subtype type, void *arg, | |
2963 | struct sctp_cmd_seq *commands) | |
2964 | { | |
2965 | struct sctp_chunk *chunk = arg; | |
2966 | ||
2967 | if (!chunk->singleton) | |
2968 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2969 | ||
2970 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) | |
2971 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
2972 | ||
2973 | if (chunk->sctp_hdr->vtag != 0) | |
2974 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); | |
2975 | ||
2976 | return __sctp_sf_do_9_2_reshutack(net, ep, asoc, type, arg, commands); | |
2977 | } | |
2978 | ||
1da177e4 LT |
2979 | /* |
2980 | * sctp_sf_do_ecn_cwr | |
2981 | * | |
2982 | * Section: Appendix A: Explicit Congestion Notification | |
2983 | * | |
2984 | * CWR: | |
2985 | * | |
2986 | * RFC 2481 details a specific bit for a sender to send in the header of | |
2987 | * its next outbound TCP segment to indicate to its peer that it has | |
2988 | * reduced its congestion window. This is termed the CWR bit. For | |
2989 | * SCTP the same indication is made by including the CWR chunk. | |
2990 | * This chunk contains one data element, i.e. the TSN number that | |
2991 | * was sent in the ECNE chunk. This element represents the lowest | |
2992 | * TSN number in the datagram that was originally marked with the | |
2993 | * CE bit. | |
2994 | * | |
2995 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2996 | * Inputs | |
2997 | * (endpoint, asoc, chunk) | |
2998 | * | |
2999 | * Outputs | |
3000 | * (asoc, reply_msg, msg_up, timers, counters) | |
3001 | * | |
3002 | * The return value is the disposition of the chunk. | |
3003 | */ | |
172a1599 XL |
3004 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
3005 | const struct sctp_endpoint *ep, | |
3006 | const struct sctp_association *asoc, | |
3007 | const union sctp_subtype type, | |
3008 | void *arg, | |
3009 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3010 | { |
1da177e4 | 3011 | struct sctp_chunk *chunk = arg; |
65f77105 | 3012 | struct sctp_cwrhdr *cwr; |
34bcca28 | 3013 | u32 lowest_tsn; |
1da177e4 LT |
3014 | |
3015 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3016 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3017 | |
b515fd27 | 3018 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3019 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3020 | commands); |
d808ad9a | 3021 | |
65f77105 XL |
3022 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
3023 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 3024 | |
34bcca28 | 3025 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
3026 | |
3027 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 3028 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
3029 | /* Stop sending ECNE. */ |
3030 | sctp_add_cmd_sf(commands, | |
3031 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 3032 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
3033 | } |
3034 | return SCTP_DISPOSITION_CONSUME; | |
3035 | } | |
3036 | ||
3037 | /* | |
3038 | * sctp_sf_do_ecne | |
3039 | * | |
3040 | * Section: Appendix A: Explicit Congestion Notification | |
3041 | * | |
3042 | * ECN-Echo | |
3043 | * | |
3044 | * RFC 2481 details a specific bit for a receiver to send back in its | |
3045 | * TCP acknowledgements to notify the sender of the Congestion | |
3046 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
3047 | * same indication is made by including the ECNE chunk. This chunk | |
3048 | * contains one data element, i.e. the lowest TSN associated with the IP | |
3049 | * datagram marked with the CE bit..... | |
3050 | * | |
3051 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3052 | * Inputs | |
3053 | * (endpoint, asoc, chunk) | |
3054 | * | |
3055 | * Outputs | |
3056 | * (asoc, reply_msg, msg_up, timers, counters) | |
3057 | * | |
3058 | * The return value is the disposition of the chunk. | |
3059 | */ | |
172a1599 XL |
3060 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
3061 | const struct sctp_endpoint *ep, | |
3062 | const struct sctp_association *asoc, | |
3063 | const union sctp_subtype type, | |
3064 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 3065 | { |
1da177e4 | 3066 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 3067 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
3068 | |
3069 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3070 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3071 | |
b515fd27 | 3072 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 3073 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3074 | commands); |
3075 | ||
1fb6d83b XL |
3076 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
3077 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
3078 | |
3079 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
3080 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
3081 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
3082 | ||
3083 | return SCTP_DISPOSITION_CONSUME; | |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
3088 | * | |
3089 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
3090 | * DATA chunk. | |
3091 | * | |
3092 | * The guidelines on delayed acknowledgement algorithm specified in | |
3093 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
3094 | * acknowledgement SHOULD be generated for at least every second packet | |
3095 | * (not every second DATA chunk) received, and SHOULD be generated within | |
3096 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
3097 | * situations it may be beneficial for an SCTP transmitter to be more | |
3098 | * conservative than the algorithms detailed in this document allow. | |
3099 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
3100 | * following algorithms allow. | |
3101 | * | |
3102 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
3103 | * incoming packet, other than to update the offered window as the | |
3104 | * receiving application consumes new data. | |
3105 | * | |
3106 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3107 | * | |
3108 | * Inputs | |
3109 | * (endpoint, asoc, chunk) | |
3110 | * | |
3111 | * Outputs | |
3112 | * (asoc, reply_msg, msg_up, timers, counters) | |
3113 | * | |
3114 | * The return value is the disposition of the chunk. | |
3115 | */ | |
172a1599 XL |
3116 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3117 | const struct sctp_endpoint *ep, | |
3118 | const struct sctp_association *asoc, | |
3119 | const union sctp_subtype type, | |
3120 | void *arg, | |
3121 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3122 | { |
c488b770 | 3123 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3124 | struct sctp_chunk *chunk = arg; |
3125 | int error; | |
3126 | ||
3127 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3128 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3129 | SCTP_NULL()); | |
24cb81a6 | 3130 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3131 | } |
1da177e4 | 3132 | |
9d4ceaf1 | 3133 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3134 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3135 | commands); |
3136 | ||
cb3f837b | 3137 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3138 | switch (error) { |
3139 | case SCTP_IERROR_NO_ERROR: | |
3140 | break; | |
3141 | case SCTP_IERROR_HIGH_TSN: | |
3142 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3143 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3144 | goto discard_noforce; |
3145 | case SCTP_IERROR_DUP_TSN: | |
3146 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3147 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3148 | goto discard_force; |
3149 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3150 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3151 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3152 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3153 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3154 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3155 | default: |
3156 | BUG(); | |
3157 | } | |
3158 | ||
6dc7694f WY |
3159 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3160 | force = SCTP_FORCE(); | |
3161 | ||
9f70f46b | 3162 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3163 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3164 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3165 | } | |
3166 | ||
3167 | /* If this is the last chunk in a packet, we need to count it | |
3168 | * toward sack generation. Note that we need to SACK every | |
3169 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3170 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3171 | * the verification tag test. | |
3172 | * | |
3173 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3174 | * | |
3175 | * The SCTP endpoint MUST always acknowledge the reception of | |
3176 | * each valid DATA chunk. | |
3177 | * | |
3178 | * The guidelines on delayed acknowledgement algorithm | |
3179 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3180 | * Specifically, an acknowledgement SHOULD be generated for at | |
3181 | * least every second packet (not every second DATA chunk) | |
3182 | * received, and SHOULD be generated within 200 ms of the | |
3183 | * arrival of any unacknowledged DATA chunk. In some | |
3184 | * situations it may be beneficial for an SCTP transmitter to | |
3185 | * be more conservative than the algorithms detailed in this | |
3186 | * document allow. However, an SCTP transmitter MUST NOT be | |
3187 | * more aggressive than the following algorithms allow. | |
3188 | */ | |
52ccb8e9 | 3189 | if (chunk->end_of_packet) |
6dc7694f | 3190 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3191 | |
1da177e4 LT |
3192 | return SCTP_DISPOSITION_CONSUME; |
3193 | ||
3194 | discard_force: | |
3195 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3196 | * | |
3197 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3198 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3199 | * SACK with no delay. If a packet arrives with duplicate | |
3200 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3201 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3202 | * DATA chunks will occur when the original SACK chunk was lost | |
3203 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3204 | * SHOULD be reported in the SACK as duplicate. | |
3205 | */ | |
3206 | /* In our case, we split the MAY SACK advice up whether or not | |
3207 | * the last chunk is a duplicate.' | |
3208 | */ | |
3209 | if (chunk->end_of_packet) | |
3210 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3211 | return SCTP_DISPOSITION_DISCARD; | |
3212 | ||
3213 | discard_noforce: | |
52ccb8e9 | 3214 | if (chunk->end_of_packet) |
6dc7694f | 3215 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3216 | |
1da177e4 | 3217 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3218 | } |
3219 | ||
3220 | /* | |
3221 | * sctp_sf_eat_data_fast_4_4 | |
3222 | * | |
3223 | * Section: 4 (4) | |
3224 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3225 | * DATA chunks without delay. | |
3226 | * | |
3227 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3228 | * Inputs | |
3229 | * (endpoint, asoc, chunk) | |
3230 | * | |
3231 | * Outputs | |
3232 | * (asoc, reply_msg, msg_up, timers, counters) | |
3233 | * | |
3234 | * The return value is the disposition of the chunk. | |
3235 | */ | |
172a1599 XL |
3236 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3237 | struct net *net, | |
3238 | const struct sctp_endpoint *ep, | |
3239 | const struct sctp_association *asoc, | |
3240 | const union sctp_subtype type, | |
3241 | void *arg, | |
3242 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3243 | { |
3244 | struct sctp_chunk *chunk = arg; | |
3245 | int error; | |
3246 | ||
3247 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3248 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3249 | SCTP_NULL()); | |
24cb81a6 | 3250 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3251 | } |
3252 | ||
9d4ceaf1 | 3253 | if (!sctp_chunk_length_valid(chunk, sctp_datachk_len(&asoc->stream))) |
24cb81a6 | 3254 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3255 | commands); |
3256 | ||
cb3f837b | 3257 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3258 | switch (error) { |
3259 | case SCTP_IERROR_NO_ERROR: | |
3260 | case SCTP_IERROR_HIGH_TSN: | |
3261 | case SCTP_IERROR_DUP_TSN: | |
3262 | case SCTP_IERROR_IGNORE_TSN: | |
3263 | case SCTP_IERROR_BAD_STREAM: | |
3264 | break; | |
3265 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3266 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3267 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3268 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a | 3269 | (u8 *)chunk->subh.data_hdr, |
9d4ceaf1 | 3270 | sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
3271 | default: |
3272 | BUG(); | |
3273 | } | |
3274 | ||
3275 | /* Go a head and force a SACK, since we are shutting down. */ | |
3276 | ||
3277 | /* Implementor's Guide. | |
3278 | * | |
3279 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3280 | * respond to each received packet containing one or more DATA chunk(s) | |
3281 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3282 | */ | |
3283 | if (chunk->end_of_packet) { | |
3284 | /* We must delay the chunk creation since the cumulative | |
3285 | * TSN has not been updated yet. | |
3286 | */ | |
3287 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3288 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3289 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3290 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3291 | } | |
3292 | ||
1da177e4 LT |
3293 | return SCTP_DISPOSITION_CONSUME; |
3294 | } | |
3295 | ||
3296 | /* | |
3297 | * Section: 6.2 Processing a Received SACK | |
3298 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3299 | * | |
3300 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3301 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3302 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3303 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3304 | * | |
3305 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3306 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3307 | * and the Gap Ack Blocks. | |
3308 | * | |
3309 | * iii) If the SACK is missing a TSN that was previously | |
3310 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3311 | * reneged on the data), then mark the corresponding DATA chunk | |
3312 | * as available for retransmit: Mark it as missing for fast | |
3313 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3314 | * timer is running for the destination address to which the DATA | |
3315 | * chunk was originally transmitted, then T3-rtx is started for | |
3316 | * that destination address. | |
3317 | * | |
3318 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3319 | * | |
3320 | * Inputs | |
3321 | * (endpoint, asoc, chunk) | |
3322 | * | |
3323 | * Outputs | |
3324 | * (asoc, reply_msg, msg_up, timers, counters) | |
3325 | * | |
3326 | * The return value is the disposition of the chunk. | |
3327 | */ | |
172a1599 XL |
3328 | enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, |
3329 | const struct sctp_endpoint *ep, | |
3330 | const struct sctp_association *asoc, | |
3331 | const union sctp_subtype type, | |
3332 | void *arg, | |
3333 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3334 | { |
3335 | struct sctp_chunk *chunk = arg; | |
78731085 | 3336 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3337 | __u32 ctsn; |
3338 | ||
103d750c MH |
3339 | trace_sctp_probe(ep, asoc, chunk); |
3340 | ||
1da177e4 | 3341 | if (!sctp_vtag_verify(chunk, asoc)) |
24cb81a6 | 3342 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3343 | |
3344 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3345 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3346 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3347 | commands); |
3348 | ||
3349 | /* Pull the SACK chunk from the data buffer */ | |
3350 | sackh = sctp_sm_pull_sack(chunk); | |
3351 | /* Was this a bogus SACK? */ | |
3352 | if (!sackh) | |
24cb81a6 | 3353 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3354 | chunk->subh.sack_hdr = sackh; |
3355 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3356 | ||
3357 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN | |
3358 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3359 | * Ack is monotonically increasing, a SACK whose | |
3360 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3361 | * Point indicates an out-of-order SACK. | |
3362 | */ | |
3363 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3364 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3365 | asoc->ctsn_ack_point); | |
3366 | ||
1da177e4 LT |
3367 | return SCTP_DISPOSITION_DISCARD; |
3368 | } | |
3369 | ||
aecedeab WY |
3370 | /* If Cumulative TSN Ack beyond the max tsn currently |
3371 | * send, terminating the association and respond to the | |
3372 | * sender with an ABORT. | |
3373 | */ | |
3374 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 3375 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab | 3376 | |
1da177e4 | 3377 | /* Return this SACK for further processing. */ |
edfee033 | 3378 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3379 | |
3380 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3381 | * sideeffect. | |
3382 | */ | |
3383 | return SCTP_DISPOSITION_CONSUME; | |
3384 | } | |
3385 | ||
3386 | /* | |
3387 | * Generate an ABORT in response to a packet. | |
3388 | * | |
047a2428 | 3389 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3390 | * |
047a2428 JF |
3391 | * 8) The receiver should respond to the sender of the OOTB packet with |
3392 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3393 | * MUST fill in the Verification Tag field of the outbound packet | |
3394 | * with the value found in the Verification Tag field of the OOTB | |
3395 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3396 | * Verification Tag is reflected. After sending this ABORT, the | |
3397 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3398 | * no further action. | |
1da177e4 LT |
3399 | * |
3400 | * Verification Tag: | |
3401 | * | |
3402 | * The return value is the disposition of the chunk. | |
3403 | */ | |
172a1599 XL |
3404 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3405 | struct net *net, | |
24cb81a6 | 3406 | const struct sctp_endpoint *ep, |
1da177e4 | 3407 | const struct sctp_association *asoc, |
bfc6f827 | 3408 | const union sctp_subtype type, |
1da177e4 | 3409 | void *arg, |
a85bbeb2 | 3410 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3411 | { |
3412 | struct sctp_packet *packet = NULL; | |
3413 | struct sctp_chunk *chunk = arg; | |
3414 | struct sctp_chunk *abort; | |
3415 | ||
2ce95503 | 3416 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3417 | if (!packet) |
3418 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3419 | |
eab59075 MRL |
3420 | /* Make an ABORT. The T bit will be set if the asoc |
3421 | * is NULL. | |
3422 | */ | |
3423 | abort = sctp_make_abort(asoc, chunk, 0); | |
3424 | if (!abort) { | |
3425 | sctp_ootb_pkt_free(packet); | |
3426 | return SCTP_DISPOSITION_NOMEM; | |
3427 | } | |
047a2428 | 3428 | |
eab59075 MRL |
3429 | /* Reflect vtag if T-Bit is set */ |
3430 | if (sctp_test_T_bit(abort)) | |
3431 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3432 | |
eab59075 MRL |
3433 | /* Set the skb to the belonging sock for accounting. */ |
3434 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3435 | |
eab59075 | 3436 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3437 | |
eab59075 MRL |
3438 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3439 | SCTP_PACKET(packet)); | |
1da177e4 | 3440 | |
eab59075 | 3441 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3442 | |
eab59075 MRL |
3443 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3444 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3445 | } |
3446 | ||
3447 | /* | |
3448 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3449 | * event as ULP notification for each cause included in the chunk. | |
3450 | * | |
3451 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3452 | * | |
3453 | * The return value is the disposition of the chunk. | |
3454 | */ | |
172a1599 XL |
3455 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3456 | const struct sctp_endpoint *ep, | |
3457 | const struct sctp_association *asoc, | |
3458 | const union sctp_subtype type, | |
3459 | void *arg, | |
3460 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3461 | { |
3462 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3463 | struct sctp_errhdr *err; |
1da177e4 LT |
3464 | |
3465 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3466 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3467 | |
3468 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3469 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3470 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3471 | commands); |
8a00be1c SW |
3472 | sctp_walk_errors(err, chunk->chunk_hdr); |
3473 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3474 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3475 | (void *)err, commands); |
1da177e4 | 3476 | |
3df26787 WY |
3477 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3478 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3479 | |
1da177e4 | 3480 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3481 | } |
3482 | ||
3483 | /* | |
3484 | * Process an inbound SHUTDOWN ACK. | |
3485 | * | |
3486 | * From Section 9.2: | |
3487 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3488 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3489 | * peer, and remove all record of the association. | |
3490 | * | |
3491 | * The return value is the disposition. | |
3492 | */ | |
172a1599 XL |
3493 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3494 | const struct sctp_endpoint *ep, | |
3495 | const struct sctp_association *asoc, | |
3496 | const union sctp_subtype type, | |
3497 | void *arg, | |
3498 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3499 | { |
3500 | struct sctp_chunk *chunk = arg; | |
3501 | struct sctp_chunk *reply; | |
3502 | struct sctp_ulpevent *ev; | |
3503 | ||
3504 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3505 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3506 | |
3507 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3508 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3509 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3510 | commands); |
1da177e4 LT |
3511 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3512 | * | |
3513 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3514 | * notification is passed to the upper layer. | |
3515 | */ | |
3516 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3517 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3518 | if (!ev) |
3519 | goto nomem; | |
3520 | ||
df7deeb5 VY |
3521 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3522 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3523 | if (!reply) | |
3524 | goto nomem_chunk; | |
3525 | ||
3526 | /* Do all the commands now (after allocation), so that we | |
3527 | * have consistent state if memory allocation failes | |
3528 | */ | |
1da177e4 LT |
3529 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3530 | ||
3531 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3532 | * stop the T2-shutdown timer, | |
3533 | */ | |
3534 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3535 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3536 | ||
3537 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3538 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3539 | ||
1da177e4 LT |
3540 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3541 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3542 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3543 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3544 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3545 | ||
3546 | /* ...and remove all record of the association. */ | |
3547 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3548 | return SCTP_DISPOSITION_DELETE_TCB; | |
3549 | ||
df7deeb5 VY |
3550 | nomem_chunk: |
3551 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3552 | nomem: |
3553 | return SCTP_DISPOSITION_NOMEM; | |
3554 | } | |
3555 | ||
3556 | /* | |
047a2428 JF |
3557 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3558 | * | |
1da177e4 LT |
3559 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3560 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3561 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3562 | * packet must fill in the Verification Tag field of the outbound | |
3563 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3564 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3565 | * Tag is reflected. | |
1da177e4 LT |
3566 | * |
3567 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3568 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3569 | * MUST fill in the Verification Tag field of the outbound packet | |
3570 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3571 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3572 | * Verification Tag is reflected. After sending this ABORT, the | |
3573 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3574 | * no further action. | |
1da177e4 | 3575 | */ |
172a1599 XL |
3576 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3577 | const struct sctp_endpoint *ep, | |
3578 | const struct sctp_association *asoc, | |
3579 | const union sctp_subtype type, | |
3580 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3581 | { |
3582 | struct sctp_chunk *chunk = arg; | |
3583 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3584 | struct sctp_chunkhdr *ch; |
d8238d9d | 3585 | struct sctp_errhdr *err; |
85c5ed4e | 3586 | int ootb_cookie_ack = 0; |
172a1599 XL |
3587 | int ootb_shut_ack = 0; |
3588 | __u8 *ch_end; | |
1da177e4 | 3589 | |
b01a2407 | 3590 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3591 | |
01e22741 XL |
3592 | if (asoc && !sctp_vtag_verify(chunk, asoc)) |
3593 | asoc = NULL; | |
3594 | ||
922dbc5b | 3595 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3596 | do { |
ece25dfa | 3597 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3598 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3599 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3600 | commands); |
1da177e4 | 3601 | |
bf911e98 MRL |
3602 | /* Report violation if chunk len overflows */ |
3603 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3604 | if (ch_end > skb_tail_pointer(skb)) | |
3605 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3606 | commands); | |
3607 | ||
ece25dfa VY |
3608 | /* Now that we know we at least have a chunk header, |
3609 | * do things that are type appropriate. | |
3610 | */ | |
1da177e4 LT |
3611 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3612 | ootb_shut_ack = 1; | |
3613 | ||
3614 | /* RFC 2960, Section 3.3.7 | |
3615 | * Moreover, under any circumstances, an endpoint that | |
3616 | * receives an ABORT MUST NOT respond to that ABORT by | |
3617 | * sending an ABORT of its own. | |
3618 | */ | |
3619 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3620 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3621 | |
85c5ed4e SW |
3622 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3623 | * or a COOKIE ACK the SCTP Packet should be silently | |
3624 | * discarded. | |
3625 | */ | |
3626 | ||
3627 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3628 | ootb_cookie_ack = 1; | |
3629 | ||
3630 | if (SCTP_CID_ERROR == ch->type) { | |
3631 | sctp_walk_errors(err, ch) { | |
3632 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3633 | ootb_cookie_ack = 1; | |
3634 | break; | |
3635 | } | |
3636 | } | |
3637 | } | |
3638 | ||
922dbc5b | 3639 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3640 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3641 | |
3642 | if (ootb_shut_ack) | |
24cb81a6 | 3643 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3644 | else if (ootb_cookie_ack) |
24cb81a6 | 3645 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3646 | else |
24cb81a6 | 3647 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3648 | } |
3649 | ||
3650 | /* | |
3651 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3652 | * | |
047a2428 JF |
3653 | * Section: 8.4 5, sctpimpguide 2.41. |
3654 | * | |
1da177e4 | 3655 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3656 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3657 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3658 | * packet must fill in the Verification Tag field of the outbound | |
3659 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3660 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3661 | * Tag is reflected. | |
1da177e4 LT |
3662 | * |
3663 | * Inputs | |
3664 | * (endpoint, asoc, type, arg, commands) | |
3665 | * | |
3666 | * Outputs | |
172a1599 | 3667 | * (enum sctp_disposition) |
1da177e4 LT |
3668 | * |
3669 | * The return value is the disposition of the chunk. | |
3670 | */ | |
172a1599 XL |
3671 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3672 | struct net *net, | |
3673 | const struct sctp_endpoint *ep, | |
3674 | const struct sctp_association *asoc, | |
3675 | const union sctp_subtype type, | |
3676 | void *arg, | |
3677 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3678 | { |
3679 | struct sctp_packet *packet = NULL; | |
3680 | struct sctp_chunk *chunk = arg; | |
3681 | struct sctp_chunk *shut; | |
3682 | ||
2ce95503 | 3683 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3684 | if (!packet) |
3685 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3686 | |
1ff01561 MRL |
3687 | /* Make an SHUTDOWN_COMPLETE. |
3688 | * The T bit will be set if the asoc is NULL. | |
3689 | */ | |
3690 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3691 | if (!shut) { | |
3692 | sctp_ootb_pkt_free(packet); | |
3693 | return SCTP_DISPOSITION_NOMEM; | |
3694 | } | |
047a2428 | 3695 | |
1ff01561 MRL |
3696 | /* Reflect vtag if T-Bit is set */ |
3697 | if (sctp_test_T_bit(shut)) | |
3698 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3699 | |
1ff01561 MRL |
3700 | /* Set the skb to the belonging sock for accounting. */ |
3701 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3702 | |
1ff01561 | 3703 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3704 | |
1ff01561 MRL |
3705 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3706 | SCTP_PACKET(packet)); | |
1da177e4 | 3707 | |
1ff01561 | 3708 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3709 | |
1ff01561 MRL |
3710 | /* We need to discard the rest of the packet to prevent |
3711 | * potential bomming attacks from additional bundled chunks. | |
3712 | * This is documented in SCTP Threats ID. | |
3713 | */ | |
3714 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3715 | } |
3716 | ||
3717 | /* | |
3718 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3719 | * | |
3720 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3721 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3722 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3723 | * should be treated as an Out Of The Blue packet. | |
3724 | * [This means that we do NOT check the Verification Tag on these | |
3725 | * chunks. --piggy ] | |
3726 | * | |
3727 | */ | |
172a1599 XL |
3728 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3729 | const struct sctp_endpoint *ep, | |
3730 | const struct sctp_association *asoc, | |
3731 | const union sctp_subtype type, | |
3732 | void *arg, | |
3733 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3734 | { |
ece25dfa VY |
3735 | struct sctp_chunk *chunk = arg; |
3736 | ||
f9ddc027 XL |
3737 | if (!sctp_vtag_verify(chunk, asoc)) |
3738 | asoc = NULL; | |
3739 | ||
ece25dfa | 3740 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ |
922dbc5b | 3741 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3742 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3743 | commands); |
3744 | ||
1da177e4 LT |
3745 | /* Although we do have an association in this case, it corresponds |
3746 | * to a restarted association. So the packet is treated as an OOTB | |
3747 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3748 | * called with a NULL association. | |
3749 | */ | |
24cb81a6 | 3750 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3751 | |
24cb81a6 | 3752 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3753 | } |
3754 | ||
3755 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3756 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3757 | const struct sctp_endpoint *ep, | |
3758 | const struct sctp_association *asoc, | |
3759 | const union sctp_subtype type, | |
3760 | void *arg, | |
3761 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3762 | { |
172a1599 XL |
3763 | struct sctp_paramhdr *err_param = NULL; |
3764 | struct sctp_chunk *asconf_ack = NULL; | |
3765 | struct sctp_chunk *chunk = arg; | |
3766 | struct sctp_addiphdr *hdr; | |
3767 | __u32 serial; | |
1da177e4 LT |
3768 | |
3769 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3770 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3771 | SCTP_NULL()); | |
24cb81a6 | 3772 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3773 | } |
3774 | ||
e782ed66 XL |
3775 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
3776 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) | |
3777 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3778 | commands); | |
3779 | ||
6afd2e83 VY |
3780 | /* ADD-IP: Section 4.1.1 |
3781 | * This chunk MUST be sent in an authenticated way by using | |
3782 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3783 | * is received unauthenticated it MUST be silently discarded as | |
3784 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3785 | */ | |
a2eeacc8 XL |
3786 | if (!asoc->peer.asconf_capable || |
3787 | (!net->sctp.addip_noauth && !chunk->auth)) | |
e782ed66 | 3788 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3789 | |
65205cc4 | 3790 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3791 | serial = ntohl(hdr->serial); |
3792 | ||
6f4c618d | 3793 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3794 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3795 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3796 | (void *)err_param, commands); |
6f4c618d | 3797 | |
a08de64d | 3798 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3799 | * the endpoint stored in a new association variable |
d808ad9a | 3800 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3801 | */ |
3802 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3803 | /* If this is the first instance of ASCONF in the packet, |
3804 | * we can clean our old ASCONF-ACKs. | |
3805 | */ | |
3806 | if (!chunk->has_asconf) | |
3807 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3808 | ||
3809 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3810 | * expected, process the ASCONF as described below and after | |
3811 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3812 | * the response packet and cache a copy of it (in the event it | |
3813 | * later needs to be retransmitted). | |
3814 | * | |
3815 | * Essentially, do V1-V5. | |
1da177e4 LT |
3816 | */ |
3817 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3818 | asoc, chunk); | |
3819 | if (!asconf_ack) | |
3820 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3821 | } else if (serial < asoc->peer.addip_serial + 1) { |
3822 | /* ADDIP 5.2 E2) | |
3823 | * If the value found in the Sequence Number is less than the | |
3824 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3825 | * ASCONF, and include in the outbound response packet | |
3826 | * any previously cached ASCONF-ACK response that was | |
3827 | * sent and saved that matches the Sequence Number of the | |
3828 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3829 | * Chunk exists. This will occur when an older ASCONF | |
3830 | * arrives out of order. In such a case, the receiver | |
3831 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3832 | * Chunk for that chunk. | |
1da177e4 | 3833 | */ |
a08de64d VY |
3834 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3835 | if (!asconf_ack) | |
1da177e4 | 3836 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3837 | |
3838 | /* Reset the transport so that we select the correct one | |
3839 | * this time around. This is to make sure that we don't | |
3840 | * accidentally use a stale transport that's been removed. | |
3841 | */ | |
3842 | asconf_ack->transport = NULL; | |
1da177e4 | 3843 | } else { |
a08de64d | 3844 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3845 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3846 | */ |
1da177e4 LT |
3847 | return SCTP_DISPOSITION_DISCARD; |
3848 | } | |
3849 | ||
a08de64d VY |
3850 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3851 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3852 | * the SCTP packet that held the ASCONF Chunks. | |
3853 | * | |
3854 | * To do this properly, we'll set the destination address of the chunk | |
3855 | * and at the transmit time, will try look up the transport to use. | |
3856 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3857 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3858 | */ |
a08de64d | 3859 | asconf_ack->dest = chunk->source; |
1da177e4 | 3860 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3861 | if (asoc->new_transport) { |
f7010e61 | 3862 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3863 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3864 | } | |
d808ad9a | 3865 | |
1da177e4 LT |
3866 | return SCTP_DISPOSITION_CONSUME; |
3867 | } | |
3868 | ||
fbd01973 XL |
3869 | static enum sctp_disposition sctp_send_next_asconf( |
3870 | struct net *net, | |
3871 | const struct sctp_endpoint *ep, | |
3872 | struct sctp_association *asoc, | |
3873 | const union sctp_subtype type, | |
3874 | struct sctp_cmd_seq *commands) | |
3875 | { | |
3876 | struct sctp_chunk *asconf; | |
3877 | struct list_head *entry; | |
3878 | ||
3879 | if (list_empty(&asoc->addip_chunk_list)) | |
3880 | return SCTP_DISPOSITION_CONSUME; | |
3881 | ||
3882 | entry = asoc->addip_chunk_list.next; | |
3883 | asconf = list_entry(entry, struct sctp_chunk, list); | |
3884 | ||
3885 | list_del_init(entry); | |
3886 | sctp_chunk_hold(asconf); | |
3887 | asoc->addip_last_asconf = asconf; | |
3888 | ||
3889 | return sctp_sf_do_prm_asconf(net, ep, asoc, type, asconf, commands); | |
3890 | } | |
3891 | ||
1da177e4 LT |
3892 | /* |
3893 | * ADDIP Section 4.3 General rules for address manipulation | |
3894 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3895 | * delete IP addresses the D0 to D13 rules should be applied: | |
3896 | */ | |
172a1599 XL |
3897 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3898 | const struct sctp_endpoint *ep, | |
3899 | const struct sctp_association *asoc, | |
3900 | const union sctp_subtype type, | |
3901 | void *arg, | |
3902 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3903 | { |
172a1599 XL |
3904 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3905 | struct sctp_paramhdr *err_param = NULL; | |
3906 | struct sctp_chunk *asconf_ack = arg; | |
3907 | struct sctp_addiphdr *addip_hdr; | |
3908 | __u32 sent_serial, rcvd_serial; | |
3909 | struct sctp_chunk *abort; | |
1da177e4 LT |
3910 | |
3911 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3912 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3913 | SCTP_NULL()); | |
24cb81a6 | 3914 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3915 | } |
3916 | ||
e782ed66 XL |
3917 | /* Make sure that the ADDIP chunk has a valid length. */ |
3918 | if (!sctp_chunk_length_valid(asconf_ack, | |
3919 | sizeof(struct sctp_addip_chunk))) | |
3920 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3921 | commands); | |
3922 | ||
6afd2e83 VY |
3923 | /* ADD-IP, Section 4.1.2: |
3924 | * This chunk MUST be sent in an authenticated way by using | |
3925 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3926 | * is received unauthenticated it MUST be silently discarded as | |
3927 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3928 | */ | |
a2eeacc8 XL |
3929 | if (!asoc->peer.asconf_capable || |
3930 | (!net->sctp.addip_noauth && !asconf_ack->auth)) | |
e782ed66 | 3931 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3932 | |
65205cc4 | 3933 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
3934 | rcvd_serial = ntohl(addip_hdr->serial); |
3935 | ||
6f4c618d | 3936 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 3937 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 3938 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3939 | (void *)err_param, commands); |
6f4c618d | 3940 | |
1da177e4 | 3941 | if (last_asconf) { |
65205cc4 | 3942 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
3943 | sent_serial = ntohl(addip_hdr->serial); |
3944 | } else { | |
3945 | sent_serial = asoc->addip_serial - 1; | |
3946 | } | |
3947 | ||
3948 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
3949 | * equal to the next serial number to be used but no ASCONF chunk is | |
3950 | * outstanding the endpoint MUST ABORT the association. Note that a | |
3951 | * sequence number is greater than if it is no more than 2^^31-1 | |
3952 | * larger than the current sequence number (using serial arithmetic). | |
3953 | */ | |
3954 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
3955 | !(asoc->addip_last_asconf)) { | |
3956 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3957 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3958 | if (abort) { |
00f1c2df | 3959 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
3960 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3961 | SCTP_CHUNK(abort)); | |
3962 | } | |
3963 | /* We are going to ABORT, so we might as well stop | |
3964 | * processing the rest of the chunks in the packet. | |
3965 | */ | |
3966 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3967 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 3968 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3969 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3970 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3971 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3972 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3973 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3974 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3975 | return SCTP_DISPOSITION_ABORT; |
3976 | } | |
3977 | ||
3978 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
3979 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3980 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
3981 | ||
3982 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
fbd01973 XL |
3983 | asconf_ack)) |
3984 | return sctp_send_next_asconf(net, ep, | |
3985 | (struct sctp_association *)asoc, | |
3986 | type, commands); | |
1da177e4 LT |
3987 | |
3988 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3989 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3990 | if (abort) { |
00f1c2df | 3991 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
3992 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3993 | SCTP_CHUNK(abort)); | |
3994 | } | |
3995 | /* We are going to ABORT, so we might as well stop | |
3996 | * processing the rest of the chunks in the packet. | |
3997 | */ | |
cb3f837b | 3998 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3999 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 4000 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 4001 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 4002 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
4003 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
4004 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
4005 | return SCTP_DISPOSITION_ABORT; |
4006 | } | |
4007 | ||
4008 | return SCTP_DISPOSITION_DISCARD; | |
4009 | } | |
4010 | ||
2040d3d7 | 4011 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
4012 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
4013 | const struct sctp_endpoint *ep, | |
4014 | const struct sctp_association *asoc, | |
4015 | const union sctp_subtype type, | |
4016 | void *arg, | |
4017 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
4018 | { |
4019 | struct sctp_paramhdr *err_param = NULL; | |
4020 | struct sctp_chunk *chunk = arg; | |
4021 | struct sctp_reconf_chunk *hdr; | |
4022 | union sctp_params param; | |
4023 | ||
4024 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4025 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4026 | SCTP_NULL()); | |
4027 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
4028 | } | |
4029 | ||
4030 | /* Make sure that the RECONF chunk has a valid length. */ | |
4031 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
4032 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
4033 | commands); | |
4034 | ||
4035 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
4036 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
4037 | (void *)err_param, commands); | |
4038 | ||
4039 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
4040 | sctp_walk_params(param, hdr, params) { | |
4041 | struct sctp_chunk *reply = NULL; | |
4042 | struct sctp_ulpevent *ev = NULL; | |
4043 | ||
4044 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
4045 | reply = sctp_process_strreset_outreq( | |
4046 | (struct sctp_association *)asoc, param, &ev); | |
4047 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
4048 | reply = sctp_process_strreset_inreq( | |
4049 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
4050 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
4051 | reply = sctp_process_strreset_tsnreq( | |
4052 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
4053 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
4054 | reply = sctp_process_strreset_addstrm_out( | |
4055 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
4056 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
4057 | reply = sctp_process_strreset_addstrm_in( | |
4058 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
4059 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
4060 | reply = sctp_process_strreset_resp( | |
4061 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
4062 | |
4063 | if (ev) | |
4064 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4065 | SCTP_ULPEVENT(ev)); | |
4066 | ||
4067 | if (reply) | |
4068 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4069 | SCTP_CHUNK(reply)); | |
4070 | } | |
4071 | ||
4072 | return SCTP_DISPOSITION_CONSUME; | |
4073 | } | |
4074 | ||
1da177e4 LT |
4075 | /* |
4076 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
4077 | * | |
4078 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
4079 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
4080 | * chunk, and then MUST further advance its cumulative TSN point locally | |
4081 | * if possible. | |
4082 | * After the above processing, the data receiver MUST stop reporting any | |
4083 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
4084 | * | |
4085 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4086 | * | |
4087 | * The return value is the disposition of the chunk. | |
4088 | */ | |
172a1599 XL |
4089 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
4090 | const struct sctp_endpoint *ep, | |
4091 | const struct sctp_association *asoc, | |
4092 | const union sctp_subtype type, | |
4093 | void *arg, | |
4094 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4095 | { |
1da177e4 | 4096 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4097 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4098 | __u16 len; |
4099 | __u32 tsn; | |
4100 | ||
4101 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4102 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4103 | SCTP_NULL()); | |
24cb81a6 | 4104 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4105 | } |
4106 | ||
d15c9ede XL |
4107 | if (!asoc->peer.prsctp_capable) |
4108 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4109 | ||
1da177e4 | 4110 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
0fc2ea92 | 4111 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4112 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4113 | commands); |
4114 | ||
4115 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4116 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4117 | len = ntohs(chunk->chunk_hdr->length); | |
4118 | len -= sizeof(struct sctp_chunkhdr); | |
4119 | skb_pull(chunk->skb, len); | |
4120 | ||
4121 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4122 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4123 | |
4124 | /* The TSN is too high--silently discard the chunk and count on it | |
4125 | * getting retransmitted later. | |
4126 | */ | |
4127 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4128 | goto discard_noforce; | |
4129 | ||
0fc2ea92 XL |
4130 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4131 | goto discard_noforce; | |
9fcb95a1 | 4132 | |
1da177e4 | 4133 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4134 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4135 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4136 | SCTP_CHUNK(chunk)); |
d808ad9a | 4137 | |
1da177e4 | 4138 | /* Count this as receiving DATA. */ |
9f70f46b | 4139 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4140 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4141 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4142 | } | |
d808ad9a | 4143 | |
1da177e4 | 4144 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4145 | * send another. |
1da177e4 LT |
4146 | */ |
4147 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4148 | |
4149 | return SCTP_DISPOSITION_CONSUME; | |
4150 | ||
4151 | discard_noforce: | |
4152 | return SCTP_DISPOSITION_DISCARD; | |
4153 | } | |
4154 | ||
172a1599 XL |
4155 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4156 | struct net *net, | |
4157 | const struct sctp_endpoint *ep, | |
4158 | const struct sctp_association *asoc, | |
4159 | const union sctp_subtype type, | |
4160 | void *arg, | |
4161 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4162 | { |
1da177e4 | 4163 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4164 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
4165 | __u16 len; |
4166 | __u32 tsn; | |
4167 | ||
4168 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4169 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4170 | SCTP_NULL()); | |
24cb81a6 | 4171 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4172 | } |
4173 | ||
d15c9ede XL |
4174 | if (!asoc->peer.prsctp_capable) |
4175 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4176 | ||
1da177e4 | 4177 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
0fc2ea92 | 4178 | if (!sctp_chunk_length_valid(chunk, sctp_ftsnchk_len(&asoc->stream))) |
24cb81a6 | 4179 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4180 | commands); |
4181 | ||
4182 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4183 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4184 | len = ntohs(chunk->chunk_hdr->length); | |
4185 | len -= sizeof(struct sctp_chunkhdr); | |
4186 | skb_pull(chunk->skb, len); | |
4187 | ||
4188 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4189 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4190 | |
4191 | /* The TSN is too high--silently discard the chunk and count on it | |
4192 | * getting retransmitted later. | |
4193 | */ | |
4194 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4195 | goto gen_shutdown; | |
4196 | ||
0fc2ea92 XL |
4197 | if (!asoc->stream.si->validate_ftsn(chunk)) |
4198 | goto gen_shutdown; | |
9fcb95a1 | 4199 | |
1da177e4 | 4200 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
0fc2ea92 | 4201 | if (len > sctp_ftsnhdr_len(&asoc->stream)) |
d808ad9a | 4202 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4203 | SCTP_CHUNK(chunk)); |
d808ad9a | 4204 | |
1da177e4 LT |
4205 | /* Go a head and force a SACK, since we are shutting down. */ |
4206 | gen_shutdown: | |
4207 | /* Implementor's Guide. | |
4208 | * | |
4209 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4210 | * respond to each received packet containing one or more DATA chunk(s) | |
4211 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4212 | */ | |
4213 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4214 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4215 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4216 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4217 | ||
d808ad9a | 4218 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4219 | } |
4220 | ||
bbd0d598 | 4221 | /* |
25985edc | 4222 | * SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d598 VY |
4223 | * |
4224 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4225 | * Identifier field. If this algorithm was not specified by the | |
4226 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4227 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4228 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4229 | * defined in Section 4.1. | |
4230 | * | |
4231 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4232 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4233 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4234 | * it MUST use the key specified by the Shared Key Identifier if a | |
4235 | * key has been configured for that Shared Key Identifier. If no | |
4236 | * endpoint pair shared key has been configured for that Shared Key | |
4237 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4238 | * | |
4239 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4240 | * | |
4241 | * The return value is the disposition of the chunk. | |
4242 | */ | |
4785c7ae | 4243 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 4244 | const struct sctp_association *asoc, |
172a1599 | 4245 | struct sctp_chunk *chunk) |
bbd0d598 | 4246 | { |
1b1e0bc9 | 4247 | struct sctp_shared_key *sh_key = NULL; |
bbd0d598 | 4248 | struct sctp_authhdr *auth_hdr; |
172a1599 | 4249 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4250 | struct sctp_hmac *hmac; |
4251 | unsigned int sig_len; | |
4252 | __u16 key_id; | |
bbd0d598 VY |
4253 | |
4254 | /* Pull in the auth header, so we can do some more verification */ | |
4255 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4256 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4257 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4258 | |
02582e9b | 4259 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4260 | * chunk. |
4261 | */ | |
4262 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4263 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4264 | ||
4265 | /* Make sure that the provided shared key identifier has been | |
4266 | * configured | |
4267 | */ | |
4268 | key_id = ntohs(auth_hdr->shkey_id); | |
1b1e0bc9 XL |
4269 | if (key_id != asoc->active_key_id) { |
4270 | sh_key = sctp_auth_get_shkey(asoc, key_id); | |
4271 | if (!sh_key) | |
4272 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4273 | } | |
bbd0d598 VY |
4274 | |
4275 | /* Make sure that the length of the signature matches what | |
4276 | * we expect. | |
4277 | */ | |
bb96dec7 XL |
4278 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4279 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4280 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4281 | if (sig_len != hmac->hmac_len) | |
4282 | return SCTP_IERROR_PROTO_VIOLATION; | |
4283 | ||
4284 | /* Now that we've done validation checks, we can compute and | |
4285 | * verify the hmac. The steps involved are: | |
4286 | * 1. Save the digest from the chunk. | |
4287 | * 2. Zero out the digest in the chunk. | |
4288 | * 3. Compute the new digest | |
4289 | * 4. Compare saved and new digests. | |
4290 | */ | |
4291 | digest = auth_hdr->hmac; | |
4292 | skb_pull(chunk->skb, sig_len); | |
4293 | ||
4294 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4295 | if (!save_digest) | |
4296 | goto nomem; | |
4297 | ||
4298 | memset(digest, 0, sig_len); | |
4299 | ||
4300 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 | 4301 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
1b1e0bc9 | 4302 | sh_key, GFP_ATOMIC); |
bbd0d598 VY |
4303 | |
4304 | /* Discard the packet if the digests do not match */ | |
4305 | if (memcmp(save_digest, digest, sig_len)) { | |
4306 | kfree(save_digest); | |
4307 | return SCTP_IERROR_BAD_SIG; | |
4308 | } | |
4309 | ||
4310 | kfree(save_digest); | |
4311 | chunk->auth = 1; | |
4312 | ||
4313 | return SCTP_IERROR_NO_ERROR; | |
4314 | nomem: | |
4315 | return SCTP_IERROR_NOMEM; | |
4316 | } | |
4317 | ||
172a1599 XL |
4318 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4319 | const struct sctp_endpoint *ep, | |
4320 | const struct sctp_association *asoc, | |
4321 | const union sctp_subtype type, | |
4322 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4323 | { |
bbd0d598 | 4324 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4325 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4326 | struct sctp_chunk *err_chunk; |
4785c7ae | 4327 | enum sctp_ierror error; |
bbd0d598 | 4328 | |
d2f19fa1 WY |
4329 | /* Make sure that the peer has AUTH capable */ |
4330 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4331 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4332 | |
bbd0d598 VY |
4333 | if (!sctp_vtag_verify(chunk, asoc)) { |
4334 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4335 | SCTP_NULL()); | |
24cb81a6 | 4336 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4337 | } |
4338 | ||
4339 | /* Make sure that the AUTH chunk has valid length. */ | |
4340 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4341 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4342 | commands); |
4343 | ||
4344 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
59d8d443 | 4345 | error = sctp_sf_authenticate(asoc, chunk); |
bbd0d598 | 4346 | switch (error) { |
7fd71b1e JP |
4347 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4348 | /* Generate the ERROR chunk and discard the rest | |
4349 | * of the packet | |
4350 | */ | |
4351 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4352 | SCTP_ERROR_UNSUP_HMAC, | |
4353 | &auth_hdr->hmac_id, | |
4354 | sizeof(__u16), 0); | |
4355 | if (err_chunk) { | |
4356 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4357 | SCTP_CHUNK(err_chunk)); | |
4358 | } | |
4359 | /* Fall Through */ | |
4360 | case SCTP_IERROR_AUTH_BAD_KEYID: | |
4361 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4362 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4363 | |
4364 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4365 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4366 | commands); |
4367 | ||
4368 | case SCTP_IERROR_NOMEM: | |
4369 | return SCTP_DISPOSITION_NOMEM; | |
4370 | ||
4371 | default: /* Prevent gcc warnings */ | |
4372 | break; | |
bbd0d598 VY |
4373 | } |
4374 | ||
65b07e5d VY |
4375 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4376 | struct sctp_ulpevent *ev; | |
4377 | ||
4378 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
ec2e506c | 4379 | SCTP_AUTH_NEW_KEY, GFP_ATOMIC); |
65b07e5d VY |
4380 | |
4381 | if (!ev) | |
4382 | return -ENOMEM; | |
4383 | ||
4384 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4385 | SCTP_ULPEVENT(ev)); | |
4386 | } | |
4387 | ||
bbd0d598 VY |
4388 | return SCTP_DISPOSITION_CONSUME; |
4389 | } | |
4390 | ||
1da177e4 LT |
4391 | /* |
4392 | * Process an unknown chunk. | |
4393 | * | |
4394 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4395 | * | |
4396 | * Chunk Types are encoded such that the highest-order two bits specify | |
4397 | * the action that must be taken if the processing endpoint does not | |
4398 | * recognize the Chunk Type. | |
4399 | * | |
4400 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4401 | * any further chunks within it. | |
4402 | * | |
4403 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4404 | * any further chunks within it, and report the unrecognized | |
4405 | * chunk in an 'Unrecognized Chunk Type'. | |
4406 | * | |
4407 | * 10 - Skip this chunk and continue processing. | |
4408 | * | |
4409 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4410 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4411 | * | |
4412 | * The return value is the disposition of the chunk. | |
4413 | */ | |
172a1599 XL |
4414 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4415 | const struct sctp_endpoint *ep, | |
4416 | const struct sctp_association *asoc, | |
4417 | const union sctp_subtype type, | |
4418 | void *arg, | |
4419 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4420 | { |
4421 | struct sctp_chunk *unk_chunk = arg; | |
4422 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4423 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4424 | |
bb33381d | 4425 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4426 | |
4427 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4428 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4429 | |
4430 | /* Make sure that the chunk has a valid length. | |
4431 | * Since we don't know the chunk type, we use a general | |
4432 | * chunkhdr structure to make a comparison. | |
4433 | */ | |
922dbc5b | 4434 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4435 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4436 | commands); |
4437 | ||
4438 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4439 | case SCTP_CID_ACTION_DISCARD: | |
4440 | /* Discard the packet. */ | |
24cb81a6 | 4441 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4442 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4443 | /* Generate an ERROR chunk as response. */ |
4444 | hdr = unk_chunk->chunk_hdr; | |
4445 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4446 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4447 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4448 | 0); |
1da177e4 LT |
4449 | if (err_chunk) { |
4450 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4451 | SCTP_CHUNK(err_chunk)); | |
4452 | } | |
2e3216cd VY |
4453 | |
4454 | /* Discard the packet. */ | |
24cb81a6 | 4455 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4456 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4457 | case SCTP_CID_ACTION_SKIP: |
4458 | /* Skip the chunk. */ | |
4459 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4460 | case SCTP_CID_ACTION_SKIP_ERR: |
4461 | /* Generate an ERROR chunk as response. */ | |
4462 | hdr = unk_chunk->chunk_hdr; | |
4463 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4464 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4465 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4466 | 0); |
1da177e4 LT |
4467 | if (err_chunk) { |
4468 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4469 | SCTP_CHUNK(err_chunk)); | |
4470 | } | |
4471 | /* Skip the chunk. */ | |
4472 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4473 | default: |
4474 | break; | |
4475 | } | |
4476 | ||
4477 | return SCTP_DISPOSITION_DISCARD; | |
4478 | } | |
4479 | ||
4480 | /* | |
4481 | * Discard the chunk. | |
4482 | * | |
4483 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4484 | * [Too numerous to mention...] | |
4485 | * Verification Tag: No verification needed. | |
4486 | * Inputs | |
4487 | * (endpoint, asoc, chunk) | |
4488 | * | |
4489 | * Outputs | |
4490 | * (asoc, reply_msg, msg_up, timers, counters) | |
4491 | * | |
4492 | * The return value is the disposition of the chunk. | |
4493 | */ | |
172a1599 XL |
4494 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4495 | const struct sctp_endpoint *ep, | |
4496 | const struct sctp_association *asoc, | |
4497 | const union sctp_subtype type, | |
4498 | void *arg, | |
4499 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4500 | { |
ece25dfa VY |
4501 | struct sctp_chunk *chunk = arg; |
4502 | ||
e782ed66 XL |
4503 | if (asoc && !sctp_vtag_verify(chunk, asoc)) |
4504 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
4505 | ||
ece25dfa VY |
4506 | /* Make sure that the chunk has a valid length. |
4507 | * Since we don't know the chunk type, we use a general | |
4508 | * chunkhdr structure to make a comparison. | |
4509 | */ | |
922dbc5b | 4510 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4511 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4512 | commands); |
4513 | ||
bb33381d DB |
4514 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4515 | ||
1da177e4 LT |
4516 | return SCTP_DISPOSITION_DISCARD; |
4517 | } | |
4518 | ||
4519 | /* | |
4520 | * Discard the whole packet. | |
4521 | * | |
4522 | * Section: 8.4 2) | |
4523 | * | |
4524 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4525 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4526 | * |
4527 | * Verification Tag: No verification necessary | |
4528 | * | |
4529 | * Inputs | |
4530 | * (endpoint, asoc, chunk) | |
4531 | * | |
4532 | * Outputs | |
4533 | * (asoc, reply_msg, msg_up, timers, counters) | |
4534 | * | |
4535 | * The return value is the disposition of the chunk. | |
4536 | */ | |
172a1599 XL |
4537 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4538 | const struct sctp_endpoint *ep, | |
4539 | const struct sctp_association *asoc, | |
4540 | const union sctp_subtype type, | |
4541 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4542 | { |
24cb81a6 | 4543 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4544 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4545 | ||
4546 | return SCTP_DISPOSITION_CONSUME; | |
4547 | } | |
4548 | ||
4549 | ||
4550 | /* | |
4551 | * The other end is violating protocol. | |
4552 | * | |
4553 | * Section: Not specified | |
4554 | * Verification Tag: Not specified | |
4555 | * Inputs | |
4556 | * (endpoint, asoc, chunk) | |
4557 | * | |
4558 | * Outputs | |
4559 | * (asoc, reply_msg, msg_up, timers, counters) | |
4560 | * | |
4561 | * We simply tag the chunk as a violation. The state machine will log | |
4562 | * the violation and continue. | |
4563 | */ | |
172a1599 XL |
4564 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4565 | const struct sctp_endpoint *ep, | |
4566 | const struct sctp_association *asoc, | |
4567 | const union sctp_subtype type, | |
4568 | void *arg, | |
4569 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4570 | { |
ece25dfa VY |
4571 | struct sctp_chunk *chunk = arg; |
4572 | ||
e2b20533 XL |
4573 | if (!sctp_vtag_verify(chunk, asoc)) |
4574 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
4575 | ||
ece25dfa | 4576 | /* Make sure that the chunk has a valid length. */ |
922dbc5b | 4577 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4578 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4579 | commands); |
4580 | ||
1da177e4 LT |
4581 | return SCTP_DISPOSITION_VIOLATION; |
4582 | } | |
4583 | ||
1da177e4 | 4584 | /* |
aecedeab | 4585 | * Common function to handle a protocol violation. |
1da177e4 | 4586 | */ |
172a1599 XL |
4587 | static enum sctp_disposition sctp_sf_abort_violation( |
4588 | struct net *net, | |
4589 | const struct sctp_endpoint *ep, | |
4590 | const struct sctp_association *asoc, | |
4591 | void *arg, | |
4592 | struct sctp_cmd_seq *commands, | |
4593 | const __u8 *payload, | |
4594 | const size_t paylen) | |
1da177e4 | 4595 | { |
ece25dfa | 4596 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4597 | struct sctp_chunk *chunk = arg; |
4598 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4599 | |
bbd0d598 VY |
4600 | /* SCTP-AUTH, Section 6.3: |
4601 | * It should be noted that if the receiver wants to tear | |
4602 | * down an association in an authenticated way only, the | |
4603 | * handling of malformed packets should not result in | |
4604 | * tearing down the association. | |
4605 | * | |
4606 | * This means that if we only want to abort associations | |
4607 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4608 | * can't destroy this association just because the packet |
bbd0d598 VY |
4609 | * was malformed. |
4610 | */ | |
4611 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4612 | goto discard; | |
4613 | ||
9abed245 JJ |
4614 | /* Make the abort chunk. */ |
4615 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4616 | if (!abort) | |
4617 | goto nomem; | |
4618 | ||
ece25dfa | 4619 | if (asoc) { |
f4ad85ca GJ |
4620 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4621 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4622 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4623 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4624 | |
cb1844c4 XL |
4625 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4626 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4627 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4628 | else { | |
4629 | unsigned int inittag; | |
4630 | ||
4631 | inittag = ntohl(initack->init_hdr.init_tag); | |
4632 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4633 | SCTP_U32(inittag)); | |
4634 | } | |
4635 | } | |
4636 | ||
ece25dfa | 4637 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4638 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4639 | |
ece25dfa VY |
4640 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4641 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4642 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4643 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4644 | SCTP_ERROR(ECONNREFUSED)); | |
4645 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4646 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4647 | } else { | |
4648 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4649 | SCTP_ERROR(ECONNABORTED)); | |
4650 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4651 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4652 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4653 | } |
1da177e4 | 4654 | } else { |
2ce95503 | 4655 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4656 | |
4657 | if (!packet) | |
4658 | goto nomem_pkt; | |
4659 | ||
4660 | if (sctp_test_T_bit(abort)) | |
4661 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4662 | ||
4663 | abort->skb->sk = ep->base.sk; | |
4664 | ||
4665 | sctp_packet_append_chunk(packet, abort); | |
4666 | ||
4667 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4668 | SCTP_PACKET(packet)); | |
4669 | ||
b01a2407 | 4670 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4671 | } |
4672 | ||
b01a2407 | 4673 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4674 | |
56eb82bb | 4675 | discard: |
24cb81a6 | 4676 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4677 | return SCTP_DISPOSITION_ABORT; |
4678 | ||
ece25dfa VY |
4679 | nomem_pkt: |
4680 | sctp_chunk_free(abort); | |
1da177e4 LT |
4681 | nomem: |
4682 | return SCTP_DISPOSITION_NOMEM; | |
4683 | } | |
4684 | ||
aecedeab WY |
4685 | /* |
4686 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4687 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4688 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4689 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4690 | * |
4691 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4692 | * error code. | |
4693 | * | |
4694 | * Section: Not specified | |
4695 | * Verification Tag: Nothing to do | |
4696 | * Inputs | |
4697 | * (endpoint, asoc, chunk) | |
4698 | * | |
4699 | * Outputs | |
4700 | * (reply_msg, msg_up, counters) | |
4701 | * | |
4702 | * Generate an ABORT chunk and terminate the association. | |
4703 | */ | |
172a1599 XL |
4704 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4705 | struct net *net, | |
4706 | const struct sctp_endpoint *ep, | |
4707 | const struct sctp_association *asoc, | |
4708 | const union sctp_subtype type, | |
4709 | void *arg, | |
4710 | struct sctp_cmd_seq *commands) | |
aecedeab | 4711 | { |
cb3f837b | 4712 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4713 | |
24cb81a6 | 4714 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4715 | sizeof(err_str)); |
aecedeab WY |
4716 | } |
4717 | ||
6f4c618d WY |
4718 | /* |
4719 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4720 | * If the length is smaller than the minimum length of a given parameter, |
4721 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4722 | * the length is considered as invalid. | |
6f4c618d | 4723 | */ |
172a1599 XL |
4724 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4725 | struct net *net, | |
4726 | const struct sctp_endpoint *ep, | |
4727 | const struct sctp_association *asoc, | |
4728 | const union sctp_subtype type, | |
4729 | void *arg, void *ext, | |
4730 | struct sctp_cmd_seq *commands) | |
ba016670 | 4731 | { |
ba016670 WY |
4732 | struct sctp_paramhdr *param = ext; |
4733 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4734 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4735 | |
ba016670 WY |
4736 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4737 | goto discard; | |
4738 | ||
4739 | /* Make the abort chunk. */ | |
4740 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4741 | if (!abort) | |
4742 | goto nomem; | |
4743 | ||
4744 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4745 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4746 | |
4747 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4748 | SCTP_ERROR(ECONNABORTED)); | |
4749 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4750 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4751 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4752 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4753 | |
4754 | discard: | |
24cb81a6 | 4755 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4756 | return SCTP_DISPOSITION_ABORT; |
4757 | nomem: | |
4758 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4759 | } |
4760 | ||
aecedeab WY |
4761 | /* Handle a protocol violation when the peer trying to advance the |
4762 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4763 | * | |
4764 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4765 | * error code. | |
4766 | */ | |
172a1599 XL |
4767 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4768 | struct net *net, | |
4769 | const struct sctp_endpoint *ep, | |
4770 | const struct sctp_association *asoc, | |
4771 | const union sctp_subtype type, | |
4772 | void *arg, | |
4773 | struct sctp_cmd_seq *commands) | |
aecedeab | 4774 | { |
cb3f837b | 4775 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4776 | |
24cb81a6 | 4777 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4778 | sizeof(err_str)); |
aecedeab WY |
4779 | } |
4780 | ||
ece25dfa | 4781 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4782 | * when we have an association and we receive bundled INIT-ACK, or |
ece25dfa | 4783 | * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edc | 4784 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4785 | * on the path and we may not want to continue this communication. |
4786 | */ | |
172a1599 XL |
4787 | static enum sctp_disposition sctp_sf_violation_chunk( |
4788 | struct net *net, | |
4789 | const struct sctp_endpoint *ep, | |
4790 | const struct sctp_association *asoc, | |
4791 | const union sctp_subtype type, | |
4792 | void *arg, | |
4793 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4794 | { |
cb3f837b | 4795 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4796 | |
4797 | if (!asoc) | |
24cb81a6 | 4798 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4799 | |
24cb81a6 | 4800 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4801 | sizeof(err_str)); |
ece25dfa | 4802 | } |
1da177e4 LT |
4803 | /*************************************************************************** |
4804 | * These are the state functions for handling primitive (Section 10) events. | |
4805 | ***************************************************************************/ | |
4806 | /* | |
4807 | * sctp_sf_do_prm_asoc | |
4808 | * | |
4809 | * Section: 10.1 ULP-to-SCTP | |
4810 | * B) Associate | |
4811 | * | |
4812 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4813 | * outbound stream count) | |
4814 | * -> association id [,destination transport addr list] [,outbound stream | |
4815 | * count] | |
4816 | * | |
4817 | * This primitive allows the upper layer to initiate an association to a | |
4818 | * specific peer endpoint. | |
4819 | * | |
4820 | * The peer endpoint shall be specified by one of the transport addresses | |
4821 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4822 | * instance has not been initialized, the ASSOCIATE is considered an | |
4823 | * error. | |
4824 | * [This is not relevant for the kernel implementation since we do all | |
4825 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4826 | * get anywhere near this code.] | |
4827 | * | |
4828 | * An association id, which is a local handle to the SCTP association, | |
4829 | * will be returned on successful establishment of the association. If | |
4830 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4831 | * an error is returned. | |
4832 | * [In the kernel implementation, the struct sctp_association needs to | |
4833 | * be created BEFORE causing this primitive to run.] | |
4834 | * | |
4835 | * Other association parameters may be returned, including the | |
4836 | * complete destination transport addresses of the peer as well as the | |
4837 | * outbound stream count of the local endpoint. One of the transport | |
4838 | * address from the returned destination addresses will be selected by | |
4839 | * the local endpoint as default primary path for sending SCTP packets | |
4840 | * to this peer. The returned "destination transport addr list" can | |
4841 | * be used by the ULP to change the default primary path or to force | |
4842 | * sending a packet to a specific transport address. [All of this | |
4843 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4844 | * function.] | |
4845 | * | |
4846 | * Mandatory attributes: | |
4847 | * | |
4848 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4849 | * [This is the argument asoc.] | |
4850 | * o destination transport addr - specified as one of the transport | |
4851 | * addresses of the peer endpoint with which the association is to be | |
4852 | * established. | |
4853 | * [This is asoc->peer.active_path.] | |
4854 | * o outbound stream count - the number of outbound streams the ULP | |
4855 | * would like to open towards this peer endpoint. | |
4856 | * [BUG: This is not currently implemented.] | |
4857 | * Optional attributes: | |
4858 | * | |
4859 | * None. | |
4860 | * | |
4861 | * The return value is a disposition. | |
4862 | */ | |
172a1599 XL |
4863 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4864 | const struct sctp_endpoint *ep, | |
4865 | const struct sctp_association *asoc, | |
4866 | const union sctp_subtype type, | |
4867 | void *arg, | |
4868 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4869 | { |
26ac8e5f | 4870 | struct sctp_association *my_asoc; |
172a1599 | 4871 | struct sctp_chunk *repl; |
1da177e4 LT |
4872 | |
4873 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4874 | * sending the INIT, but that doesn't actually work in our | |
4875 | * implementation... | |
4876 | */ | |
4877 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4878 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4879 | ||
4880 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4881 | * | |
4882 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4883 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4884 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4885 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4886 | */ | |
4887 | ||
4888 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4889 | if (!repl) | |
4890 | goto nomem; | |
4891 | ||
405426f6 DB |
4892 | /* Choose transport for INIT. */ |
4893 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4894 | SCTP_CHUNK(repl)); | |
4895 | ||
1da177e4 LT |
4896 | /* Cast away the const modifier, as we want to just |
4897 | * rerun it through as a sideffect. | |
4898 | */ | |
ab38fb04 VY |
4899 | my_asoc = (struct sctp_association *)asoc; |
4900 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4901 | |
4902 | /* After sending the INIT, "A" starts the T1-init timer and | |
4903 | * enters the COOKIE-WAIT state. | |
4904 | */ | |
4905 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4906 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4907 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4908 | return SCTP_DISPOSITION_CONSUME; | |
4909 | ||
4910 | nomem: | |
4911 | return SCTP_DISPOSITION_NOMEM; | |
4912 | } | |
4913 | ||
4914 | /* | |
4915 | * Process the SEND primitive. | |
4916 | * | |
4917 | * Section: 10.1 ULP-to-SCTP | |
4918 | * E) Send | |
4919 | * | |
4920 | * Format: SEND(association id, buffer address, byte count [,context] | |
4921 | * [,stream id] [,life time] [,destination transport address] | |
4922 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4923 | * -> result | |
4924 | * | |
4925 | * This is the main method to send user data via SCTP. | |
4926 | * | |
4927 | * Mandatory attributes: | |
4928 | * | |
4929 | * o association id - local handle to the SCTP association | |
4930 | * | |
4931 | * o buffer address - the location where the user message to be | |
4932 | * transmitted is stored; | |
4933 | * | |
4934 | * o byte count - The size of the user data in number of bytes; | |
4935 | * | |
4936 | * Optional attributes: | |
4937 | * | |
4938 | * o context - an optional 32 bit integer that will be carried in the | |
4939 | * sending failure notification to the ULP if the transportation of | |
4940 | * this User Message fails. | |
4941 | * | |
4942 | * o stream id - to indicate which stream to send the data on. If not | |
4943 | * specified, stream 0 will be used. | |
4944 | * | |
4945 | * o life time - specifies the life time of the user data. The user data | |
4946 | * will not be sent by SCTP after the life time expires. This | |
4947 | * parameter can be used to avoid efforts to transmit stale | |
4948 | * user messages. SCTP notifies the ULP if the data cannot be | |
4949 | * initiated to transport (i.e. sent to the destination via SCTP's | |
4950 | * send primitive) within the life time variable. However, the | |
4951 | * user data will be transmitted if SCTP has attempted to transmit a | |
4952 | * chunk before the life time expired. | |
4953 | * | |
4954 | * o destination transport address - specified as one of the destination | |
4955 | * transport addresses of the peer endpoint to which this packet | |
4956 | * should be sent. Whenever possible, SCTP should use this destination | |
4957 | * transport address for sending the packets, instead of the current | |
4958 | * primary path. | |
4959 | * | |
4960 | * o unorder flag - this flag, if present, indicates that the user | |
4961 | * would like the data delivered in an unordered fashion to the peer | |
4962 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
4963 | * message). | |
4964 | * | |
4965 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
4966 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
4967 | * this flag is present, when faced with network congestion. | |
4968 | * | |
4969 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
4970 | * passed to the peer indicating the type of payload protocol data | |
4971 | * being transmitted. This value is passed as opaque data by SCTP. | |
4972 | * | |
4973 | * The return value is the disposition. | |
4974 | */ | |
172a1599 XL |
4975 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
4976 | const struct sctp_endpoint *ep, | |
4977 | const struct sctp_association *asoc, | |
4978 | const union sctp_subtype type, | |
4979 | void *arg, | |
4980 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4981 | { |
9c5c62be | 4982 | struct sctp_datamsg *msg = arg; |
1da177e4 | 4983 | |
9c5c62be | 4984 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
4985 | return SCTP_DISPOSITION_CONSUME; |
4986 | } | |
4987 | ||
4988 | /* | |
4989 | * Process the SHUTDOWN primitive. | |
4990 | * | |
4991 | * Section: 10.1: | |
4992 | * C) Shutdown | |
4993 | * | |
4994 | * Format: SHUTDOWN(association id) | |
4995 | * -> result | |
4996 | * | |
4997 | * Gracefully closes an association. Any locally queued user data | |
4998 | * will be delivered to the peer. The association will be terminated only | |
4999 | * after the peer acknowledges all the SCTP packets sent. A success code | |
5000 | * will be returned on successful termination of the association. If | |
5001 | * attempting to terminate the association results in a failure, an error | |
5002 | * code shall be returned. | |
5003 | * | |
5004 | * Mandatory attributes: | |
5005 | * | |
5006 | * o association id - local handle to the SCTP association | |
5007 | * | |
5008 | * Optional attributes: | |
5009 | * | |
5010 | * None. | |
5011 | * | |
5012 | * The return value is the disposition. | |
5013 | */ | |
172a1599 XL |
5014 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
5015 | struct net *net, | |
5016 | const struct sctp_endpoint *ep, | |
5017 | const struct sctp_association *asoc, | |
5018 | const union sctp_subtype type, | |
5019 | void *arg, | |
5020 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5021 | { |
172a1599 | 5022 | enum sctp_disposition disposition; |
1da177e4 LT |
5023 | |
5024 | /* From 9.2 Shutdown of an Association | |
5025 | * Upon receipt of the SHUTDOWN primitive from its upper | |
5026 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
5027 | * remains there until all outstanding data has been | |
5028 | * acknowledged by its peer. The endpoint accepts no new data | |
5029 | * from its upper layer, but retransmits data to the far end | |
5030 | * if necessary to fill gaps. | |
5031 | */ | |
5032 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5033 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
5034 | ||
1da177e4 LT |
5035 | disposition = SCTP_DISPOSITION_CONSUME; |
5036 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 5037 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
5038 | arg, commands); |
5039 | } | |
172a1599 | 5040 | |
1da177e4 LT |
5041 | return disposition; |
5042 | } | |
5043 | ||
5044 | /* | |
5045 | * Process the ABORT primitive. | |
5046 | * | |
5047 | * Section: 10.1: | |
5048 | * C) Abort | |
5049 | * | |
5050 | * Format: Abort(association id [, cause code]) | |
5051 | * -> result | |
5052 | * | |
5053 | * Ungracefully closes an association. Any locally queued user data | |
5054 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
5055 | * will be returned on successful abortion of the association. If | |
5056 | * attempting to abort the association results in a failure, an error | |
5057 | * code shall be returned. | |
5058 | * | |
5059 | * Mandatory attributes: | |
5060 | * | |
5061 | * o association id - local handle to the SCTP association | |
5062 | * | |
5063 | * Optional attributes: | |
5064 | * | |
5065 | * o cause code - reason of the abort to be passed to the peer | |
5066 | * | |
5067 | * None. | |
5068 | * | |
5069 | * The return value is the disposition. | |
5070 | */ | |
172a1599 XL |
5071 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
5072 | struct net *net, | |
5073 | const struct sctp_endpoint *ep, | |
5074 | const struct sctp_association *asoc, | |
5075 | const union sctp_subtype type, | |
5076 | void *arg, | |
5077 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5078 | { |
5079 | /* From 9.1 Abort of an Association | |
5080 | * Upon receipt of the ABORT primitive from its upper | |
5081 | * layer, the endpoint enters CLOSED state and | |
5082 | * discard all outstanding data has been | |
5083 | * acknowledged by its peer. The endpoint accepts no new data | |
5084 | * from its upper layer, but retransmits data to the far end | |
5085 | * if necessary to fill gaps. | |
5086 | */ | |
c164a9ba | 5087 | struct sctp_chunk *abort = arg; |
1da177e4 | 5088 | |
068d8bd3 XL |
5089 | if (abort) |
5090 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5091 | |
5092 | /* Even if we can't send the ABORT due to low memory delete the | |
5093 | * TCB. This is a departure from our typical NOMEM handling. | |
5094 | */ | |
5095 | ||
8de8c873 SS |
5096 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5097 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
5098 | /* Delete the established association. */ |
5099 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5100 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5101 | |
b01a2407 EB |
5102 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5103 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 5104 | |
649621e3 | 5105 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5106 | } |
5107 | ||
5108 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
5109 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
5110 | const struct sctp_endpoint *ep, | |
5111 | const struct sctp_association *asoc, | |
5112 | const union sctp_subtype type, | |
5113 | void *arg, | |
5114 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5115 | { |
5116 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
5117 | return SCTP_DISPOSITION_CONSUME; | |
5118 | } | |
5119 | ||
5120 | /* We tried an illegal operation on an association which is shutting | |
5121 | * down. | |
5122 | */ | |
172a1599 XL |
5123 | enum sctp_disposition sctp_sf_error_shutdown( |
5124 | struct net *net, | |
5125 | const struct sctp_endpoint *ep, | |
5126 | const struct sctp_association *asoc, | |
5127 | const union sctp_subtype type, | |
5128 | void *arg, | |
5129 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5130 | { |
5131 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
5132 | SCTP_ERROR(-ESHUTDOWN)); | |
5133 | return SCTP_DISPOSITION_CONSUME; | |
5134 | } | |
5135 | ||
5136 | /* | |
5137 | * sctp_cookie_wait_prm_shutdown | |
5138 | * | |
5139 | * Section: 4 Note: 2 | |
5140 | * Verification Tag: | |
5141 | * Inputs | |
5142 | * (endpoint, asoc) | |
5143 | * | |
5144 | * The RFC does not explicitly address this issue, but is the route through the | |
5145 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5146 | * | |
5147 | * Outputs | |
5148 | * (timers) | |
5149 | */ | |
172a1599 XL |
5150 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5151 | struct net *net, | |
5152 | const struct sctp_endpoint *ep, | |
5153 | const struct sctp_association *asoc, | |
5154 | const union sctp_subtype type, | |
5155 | void *arg, | |
5156 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5157 | { |
5158 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5159 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5160 | ||
5161 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5162 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5163 | ||
b01a2407 | 5164 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5165 | |
5166 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5167 | ||
5168 | return SCTP_DISPOSITION_DELETE_TCB; | |
5169 | } | |
5170 | ||
5171 | /* | |
5172 | * sctp_cookie_echoed_prm_shutdown | |
5173 | * | |
5174 | * Section: 4 Note: 2 | |
5175 | * Verification Tag: | |
5176 | * Inputs | |
5177 | * (endpoint, asoc) | |
5178 | * | |
5179 | * The RFC does not explcitly address this issue, but is the route through the | |
5180 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. | |
5181 | * | |
5182 | * Outputs | |
5183 | * (timers) | |
5184 | */ | |
172a1599 XL |
5185 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5186 | struct net *net, | |
5187 | const struct sctp_endpoint *ep, | |
5188 | const struct sctp_association *asoc, | |
5189 | const union sctp_subtype type, | |
5190 | void *arg, | |
5191 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5192 | { |
5193 | /* There is a single T1 timer, so we should be able to use | |
5194 | * common function with the COOKIE-WAIT state. | |
5195 | */ | |
24cb81a6 | 5196 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5197 | } |
5198 | ||
5199 | /* | |
5200 | * sctp_sf_cookie_wait_prm_abort | |
5201 | * | |
5202 | * Section: 4 Note: 2 | |
5203 | * Verification Tag: | |
5204 | * Inputs | |
5205 | * (endpoint, asoc) | |
5206 | * | |
5207 | * The RFC does not explicitly address this issue, but is the route through the | |
5208 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5209 | * | |
5210 | * Outputs | |
5211 | * (timers) | |
5212 | */ | |
172a1599 XL |
5213 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5214 | struct net *net, | |
5215 | const struct sctp_endpoint *ep, | |
5216 | const struct sctp_association *asoc, | |
5217 | const union sctp_subtype type, | |
5218 | void *arg, | |
5219 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5220 | { |
c164a9ba | 5221 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5222 | |
5223 | /* Stop T1-init timer */ | |
5224 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5225 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5226 | |
068d8bd3 XL |
5227 | if (abort) |
5228 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5229 | |
5230 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5231 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5232 | ||
b01a2407 | 5233 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5234 | |
5235 | /* Even if we can't send the ABORT due to low memory delete the | |
5236 | * TCB. This is a departure from our typical NOMEM handling. | |
5237 | */ | |
5238 | ||
8de8c873 SS |
5239 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5240 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5241 | /* Delete the established association. */ |
5242 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5243 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5244 | |
649621e3 | 5245 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5246 | } |
5247 | ||
5248 | /* | |
5249 | * sctp_sf_cookie_echoed_prm_abort | |
5250 | * | |
5251 | * Section: 4 Note: 3 | |
5252 | * Verification Tag: | |
5253 | * Inputs | |
5254 | * (endpoint, asoc) | |
5255 | * | |
5256 | * The RFC does not explcitly address this issue, but is the route through the | |
5257 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5258 | * | |
5259 | * Outputs | |
5260 | * (timers) | |
5261 | */ | |
172a1599 XL |
5262 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5263 | struct net *net, | |
5264 | const struct sctp_endpoint *ep, | |
5265 | const struct sctp_association *asoc, | |
5266 | const union sctp_subtype type, | |
5267 | void *arg, | |
5268 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5269 | { |
5270 | /* There is a single T1 timer, so we should be able to use | |
5271 | * common function with the COOKIE-WAIT state. | |
5272 | */ | |
24cb81a6 | 5273 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5274 | } |
5275 | ||
5276 | /* | |
5277 | * sctp_sf_shutdown_pending_prm_abort | |
5278 | * | |
5279 | * Inputs | |
5280 | * (endpoint, asoc) | |
5281 | * | |
5282 | * The RFC does not explicitly address this issue, but is the route through the | |
5283 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5284 | * | |
5285 | * Outputs | |
5286 | * (timers) | |
5287 | */ | |
172a1599 XL |
5288 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5289 | struct net *net, | |
5290 | const struct sctp_endpoint *ep, | |
5291 | const struct sctp_association *asoc, | |
5292 | const union sctp_subtype type, | |
5293 | void *arg, | |
5294 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5295 | { |
5296 | /* Stop the T5-shutdown guard timer. */ | |
5297 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5298 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5299 | ||
24cb81a6 | 5300 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5301 | } |
5302 | ||
5303 | /* | |
5304 | * sctp_sf_shutdown_sent_prm_abort | |
5305 | * | |
5306 | * Inputs | |
5307 | * (endpoint, asoc) | |
5308 | * | |
5309 | * The RFC does not explicitly address this issue, but is the route through the | |
5310 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5311 | * | |
5312 | * Outputs | |
5313 | * (timers) | |
5314 | */ | |
172a1599 XL |
5315 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
5316 | struct net *net, | |
5317 | const struct sctp_endpoint *ep, | |
5318 | const struct sctp_association *asoc, | |
5319 | const union sctp_subtype type, | |
5320 | void *arg, | |
5321 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5322 | { |
5323 | /* Stop the T2-shutdown timer. */ | |
5324 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5325 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5326 | ||
5327 | /* Stop the T5-shutdown guard timer. */ | |
5328 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5329 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5330 | ||
24cb81a6 | 5331 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5332 | } |
5333 | ||
5334 | /* | |
5335 | * sctp_sf_cookie_echoed_prm_abort | |
5336 | * | |
5337 | * Inputs | |
5338 | * (endpoint, asoc) | |
5339 | * | |
5340 | * The RFC does not explcitly address this issue, but is the route through the | |
5341 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5342 | * | |
5343 | * Outputs | |
5344 | * (timers) | |
5345 | */ | |
172a1599 XL |
5346 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5347 | struct net *net, | |
5348 | const struct sctp_endpoint *ep, | |
5349 | const struct sctp_association *asoc, | |
5350 | const union sctp_subtype type, | |
5351 | void *arg, | |
5352 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5353 | { |
5354 | /* The same T2 timer, so we should be able to use | |
5355 | * common function with the SHUTDOWN-SENT state. | |
5356 | */ | |
24cb81a6 | 5357 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5358 | } |
5359 | ||
5360 | /* | |
5361 | * Process the REQUESTHEARTBEAT primitive | |
5362 | * | |
5363 | * 10.1 ULP-to-SCTP | |
5364 | * J) Request Heartbeat | |
5365 | * | |
5366 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5367 | * | |
5368 | * -> result | |
5369 | * | |
5370 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5371 | * destination transport address of the given association. The returned | |
5372 | * result should indicate whether the transmission of the HEARTBEAT | |
5373 | * chunk to the destination address is successful. | |
5374 | * | |
5375 | * Mandatory attributes: | |
5376 | * | |
5377 | * o association id - local handle to the SCTP association | |
5378 | * | |
5379 | * o destination transport address - the transport address of the | |
5380 | * association on which a heartbeat should be issued. | |
5381 | */ | |
172a1599 | 5382 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5383 | struct net *net, |
1da177e4 LT |
5384 | const struct sctp_endpoint *ep, |
5385 | const struct sctp_association *asoc, | |
bfc6f827 | 5386 | const union sctp_subtype type, |
1da177e4 | 5387 | void *arg, |
a85bbeb2 | 5388 | struct sctp_cmd_seq *commands) |
1da177e4 | 5389 | { |
fb78525a VY |
5390 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5391 | (struct sctp_transport *)arg, commands)) | |
5392 | return SCTP_DISPOSITION_NOMEM; | |
5393 | ||
5394 | /* | |
5395 | * RFC 2960 (bis), section 8.3 | |
5396 | * | |
5397 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5398 | * transport address of a given association. | |
5399 | * | |
5400 | * The endpoint should increment the respective error counter of | |
5401 | * the destination transport address each time a HEARTBEAT is sent | |
5402 | * to that address and not acknowledged within one RTO. | |
5403 | * | |
5404 | */ | |
7e99013a | 5405 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5406 | SCTP_TRANSPORT(arg)); |
5407 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5408 | } |
5409 | ||
5410 | /* | |
5411 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5412 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5413 | * remote endpoint it should do A1 to A9 | |
5414 | */ | |
172a1599 XL |
5415 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5416 | const struct sctp_endpoint *ep, | |
5417 | const struct sctp_association *asoc, | |
5418 | const union sctp_subtype type, | |
5419 | void *arg, | |
5420 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5421 | { |
5422 | struct sctp_chunk *chunk = arg; | |
5423 | ||
5424 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5425 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5426 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5427 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5428 | return SCTP_DISPOSITION_CONSUME; | |
5429 | } | |
5430 | ||
7a090b04 | 5431 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5432 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5433 | const struct sctp_endpoint *ep, | |
5434 | const struct sctp_association *asoc, | |
5435 | const union sctp_subtype type, | |
5436 | void *arg, | |
5437 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5438 | { |
5439 | struct sctp_chunk *chunk = arg; | |
5440 | ||
5441 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5442 | return SCTP_DISPOSITION_CONSUME; | |
5443 | } | |
5444 | ||
1da177e4 LT |
5445 | /* |
5446 | * Ignore the primitive event | |
5447 | * | |
5448 | * The return value is the disposition of the primitive. | |
5449 | */ | |
172a1599 XL |
5450 | enum sctp_disposition sctp_sf_ignore_primitive( |
5451 | struct net *net, | |
5452 | const struct sctp_endpoint *ep, | |
5453 | const struct sctp_association *asoc, | |
5454 | const union sctp_subtype type, | |
5455 | void *arg, | |
5456 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5457 | { |
bb33381d DB |
5458 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5459 | type.primitive); | |
5460 | ||
1da177e4 LT |
5461 | return SCTP_DISPOSITION_DISCARD; |
5462 | } | |
5463 | ||
5464 | /*************************************************************************** | |
5465 | * These are the state functions for the OTHER events. | |
5466 | ***************************************************************************/ | |
5467 | ||
e1cdd553 WY |
5468 | /* |
5469 | * When the SCTP stack has no more user data to send or retransmit, this | |
5470 | * notification is given to the user. Also, at the time when a user app | |
5471 | * subscribes to this event, if there is no data to be sent or | |
5472 | * retransmit, the stack will immediately send up this notification. | |
5473 | */ | |
172a1599 XL |
5474 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5475 | struct net *net, | |
5476 | const struct sctp_endpoint *ep, | |
5477 | const struct sctp_association *asoc, | |
5478 | const union sctp_subtype type, | |
5479 | void *arg, | |
5480 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5481 | { |
5482 | struct sctp_ulpevent *event; | |
5483 | ||
5484 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5485 | if (!event) | |
5486 | return SCTP_DISPOSITION_NOMEM; | |
5487 | ||
5488 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5489 | ||
5490 | return SCTP_DISPOSITION_CONSUME; | |
5491 | } | |
5492 | ||
1da177e4 LT |
5493 | /* |
5494 | * Start the shutdown negotiation. | |
5495 | * | |
5496 | * From Section 9.2: | |
5497 | * Once all its outstanding data has been acknowledged, the endpoint | |
5498 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5499 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5500 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5501 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5502 | * with the updated last sequential TSN received from its peer. | |
5503 | * | |
5504 | * The return value is the disposition. | |
5505 | */ | |
172a1599 XL |
5506 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5507 | struct net *net, | |
5508 | const struct sctp_endpoint *ep, | |
5509 | const struct sctp_association *asoc, | |
5510 | const union sctp_subtype type, | |
5511 | void *arg, | |
5512 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5513 | { |
5514 | struct sctp_chunk *reply; | |
5515 | ||
5516 | /* Once all its outstanding data has been acknowledged, the | |
5517 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5518 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5519 | * has received from the peer. | |
5520 | */ | |
04992bfd | 5521 | reply = sctp_make_shutdown(asoc, arg); |
1da177e4 LT |
5522 | if (!reply) |
5523 | goto nomem; | |
5524 | ||
5525 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5526 | * T2-shutdown timer. | |
5527 | */ | |
5528 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5529 | ||
5530 | /* It shall then start the T2-shutdown timer */ | |
5531 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5532 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5533 | ||
536428a9 WY |
5534 | /* RFC 4960 Section 9.2 |
5535 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5536 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5537 | */ | |
f8d96052 | 5538 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5539 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5540 | ||
9f70f46b | 5541 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5542 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5543 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5544 | ||
5545 | /* and enter the SHUTDOWN-SENT state. */ | |
5546 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5547 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5548 | ||
5549 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5550 | * | |
5551 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5552 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5553 | */ |
5554 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5555 | ||
5556 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5557 | ||
5558 | return SCTP_DISPOSITION_CONSUME; | |
5559 | ||
5560 | nomem: | |
5561 | return SCTP_DISPOSITION_NOMEM; | |
5562 | } | |
5563 | ||
5564 | /* | |
5565 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5566 | * | |
5567 | * From Section 9.2: | |
5568 | * | |
5569 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5570 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5571 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5572 | * endpoint must re-send the SHUTDOWN ACK. | |
5573 | * | |
5574 | * The return value is the disposition. | |
5575 | */ | |
172a1599 XL |
5576 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5577 | struct net *net, | |
5578 | const struct sctp_endpoint *ep, | |
5579 | const struct sctp_association *asoc, | |
5580 | const union sctp_subtype type, | |
5581 | void *arg, | |
5582 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5583 | { |
172a1599 | 5584 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5585 | struct sctp_chunk *reply; |
5586 | ||
5587 | /* There are 2 ways of getting here: | |
5588 | * 1) called in response to a SHUTDOWN chunk | |
5589 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5590 | * | |
5591 | * For the case (2), the arg parameter is set to NULL. We need | |
5592 | * to check that we have a chunk before accessing it's fields. | |
5593 | */ | |
5594 | if (chunk) { | |
5595 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5596 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5597 | commands); | |
1da177e4 LT |
5598 | |
5599 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5600 | if (!sctp_chunk_length_valid( |
5601 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5602 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5603 | arg, commands); | |
1da177e4 LT |
5604 | } |
5605 | ||
5606 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5607 | * shall send a SHUTDOWN ACK ... | |
5608 | */ | |
5609 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5610 | if (!reply) | |
5611 | goto nomem; | |
5612 | ||
5613 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5614 | * the T2-shutdown timer. | |
5615 | */ | |
5616 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5617 | ||
5618 | /* and start/restart a T2-shutdown timer of its own, */ | |
5619 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5620 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5621 | ||
9f70f46b | 5622 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5623 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5624 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5625 | ||
5626 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5627 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5628 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5629 | ||
5630 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5631 | * | |
5632 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5633 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5634 | */ |
5635 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5636 | ||
5637 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5638 | ||
5639 | return SCTP_DISPOSITION_CONSUME; | |
5640 | ||
5641 | nomem: | |
5642 | return SCTP_DISPOSITION_NOMEM; | |
5643 | } | |
5644 | ||
5645 | /* | |
5646 | * Ignore the event defined as other | |
5647 | * | |
5648 | * The return value is the disposition of the event. | |
5649 | */ | |
172a1599 XL |
5650 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5651 | const struct sctp_endpoint *ep, | |
5652 | const struct sctp_association *asoc, | |
5653 | const union sctp_subtype type, | |
5654 | void *arg, | |
5655 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5656 | { |
bb33381d DB |
5657 | pr_debug("%s: the event other type:%d is ignored\n", |
5658 | __func__, type.other); | |
5659 | ||
1da177e4 LT |
5660 | return SCTP_DISPOSITION_DISCARD; |
5661 | } | |
5662 | ||
5663 | /************************************************************ | |
5664 | * These are the state functions for handling timeout events. | |
5665 | ************************************************************/ | |
5666 | ||
5667 | /* | |
5668 | * RTX Timeout | |
5669 | * | |
5670 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5671 | * | |
5672 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5673 | * address, do the following: | |
5674 | * [See below] | |
5675 | * | |
5676 | * The return value is the disposition of the chunk. | |
5677 | */ | |
172a1599 XL |
5678 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5679 | const struct sctp_endpoint *ep, | |
5680 | const struct sctp_association *asoc, | |
5681 | const union sctp_subtype type, | |
5682 | void *arg, | |
5683 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5684 | { |
5685 | struct sctp_transport *transport = arg; | |
5686 | ||
b01a2407 | 5687 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5688 | |
1da177e4 | 5689 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5690 | if (asoc->peer.zero_window_announced && |
5691 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5692 | /* |
5693 | * We are here likely because the receiver had its rwnd | |
5694 | * closed for a while and we have not been able to | |
5695 | * transmit the locally queued data within the maximum | |
5696 | * retransmission attempts limit. Start the T5 | |
5697 | * shutdown guard timer to give the receiver one last | |
5698 | * chance and some additional time to recover before | |
5699 | * aborting. | |
5700 | */ | |
5701 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5702 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5703 | } else { | |
5704 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5705 | SCTP_ERROR(ETIMEDOUT)); | |
5706 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5707 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5708 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5709 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5710 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5711 | return SCTP_DISPOSITION_DELETE_TCB; |
5712 | } | |
1da177e4 LT |
5713 | } |
5714 | ||
5715 | /* E1) For the destination address for which the timer | |
5716 | * expires, adjust its ssthresh with rules defined in Section | |
5717 | * 7.2.3 and set the cwnd <- MTU. | |
5718 | */ | |
5719 | ||
5720 | /* E2) For the destination address for which the timer | |
5721 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5722 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5723 | * used to provide an upper bound to this doubling operation. | |
5724 | */ | |
5725 | ||
5726 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5727 | * outstanding DATA chunks for the address for which the | |
5728 | * T3-rtx has expired will fit into a single packet, subject | |
5729 | * to the MTU constraint for the path corresponding to the | |
5730 | * destination transport address to which the retransmission | |
5731 | * is being sent (this may be different from the address for | |
5732 | * which the timer expires [see Section 6.4]). Call this | |
5733 | * value K. Bundle and retransmit those K DATA chunks in a | |
5734 | * single packet to the destination endpoint. | |
5735 | * | |
5736 | * Note: Any DATA chunks that were sent to the address for | |
5737 | * which the T3-rtx timer expired but did not fit in one MTU | |
5738 | * (rule E3 above), should be marked for retransmission and | |
5739 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5740 | */ | |
5741 | ||
1da177e4 LT |
5742 | /* Do some failure management (Section 8.2). */ |
5743 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5744 | ||
1845a579 VY |
5745 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5746 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5747 | ||
1da177e4 LT |
5748 | return SCTP_DISPOSITION_CONSUME; |
5749 | } | |
5750 | ||
5751 | /* | |
5752 | * Generate delayed SACK on timeout | |
5753 | * | |
5754 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5755 | * | |
5756 | * The guidelines on delayed acknowledgement algorithm specified in | |
5757 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5758 | * acknowledgement SHOULD be generated for at least every second packet | |
5759 | * (not every second DATA chunk) received, and SHOULD be generated | |
5760 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5761 | * some situations it may be beneficial for an SCTP transmitter to be | |
5762 | * more conservative than the algorithms detailed in this document | |
5763 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5764 | * the following algorithms allow. | |
5765 | */ | |
172a1599 XL |
5766 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5767 | const struct sctp_endpoint *ep, | |
5768 | const struct sctp_association *asoc, | |
5769 | const union sctp_subtype type, | |
5770 | void *arg, | |
5771 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5772 | { |
b01a2407 | 5773 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5774 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5775 | return SCTP_DISPOSITION_CONSUME; | |
5776 | } | |
5777 | ||
5778 | /* | |
3f7a87d2 | 5779 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5780 | * |
5781 | * Section: 4 Note: 2 | |
5782 | * Verification Tag: | |
5783 | * Inputs | |
5784 | * (endpoint, asoc) | |
5785 | * | |
5786 | * RFC 2960 Section 4 Notes | |
5787 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5788 | * and re-start the T1-init timer without changing state. This MUST | |
5789 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5790 | * endpoint MUST abort the initialization process and report the | |
5791 | * error to SCTP user. | |
5792 | * | |
3f7a87d2 FF |
5793 | * Outputs |
5794 | * (timers, events) | |
5795 | * | |
5796 | */ | |
172a1599 XL |
5797 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5798 | struct net *net, | |
5799 | const struct sctp_endpoint *ep, | |
5800 | const struct sctp_association *asoc, | |
5801 | const union sctp_subtype type, | |
5802 | void *arg, | |
5803 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5804 | { |
172a1599 | 5805 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5806 | struct sctp_chunk *repl = NULL; |
5807 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5808 | |
bb33381d DB |
5809 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5810 | ||
b01a2407 | 5811 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5812 | |
81845c21 | 5813 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5814 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5815 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5816 | if (!repl) | |
5817 | return SCTP_DISPOSITION_NOMEM; | |
5818 | ||
5819 | /* Choose transport for INIT. */ | |
5820 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5821 | SCTP_CHUNK(repl)); | |
5822 | ||
5823 | /* Issue a sideeffect to do the needed accounting. */ | |
5824 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5825 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5826 | ||
5827 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5828 | } else { | |
bb33381d DB |
5829 | pr_debug("%s: giving up on INIT, attempts:%d " |
5830 | "max_init_attempts:%d\n", __func__, attempts, | |
5831 | asoc->max_init_attempts); | |
5832 | ||
8de8c873 SS |
5833 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5834 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5835 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5836 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5837 | return SCTP_DISPOSITION_DELETE_TCB; |
5838 | } | |
5839 | ||
5840 | return SCTP_DISPOSITION_CONSUME; | |
5841 | } | |
5842 | ||
5843 | /* | |
5844 | * sctp_sf_t1_cookie_timer_expire | |
5845 | * | |
5846 | * Section: 4 Note: 2 | |
5847 | * Verification Tag: | |
5848 | * Inputs | |
5849 | * (endpoint, asoc) | |
5850 | * | |
5851 | * RFC 2960 Section 4 Notes | |
5852 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5853 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5854 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5855 | * After that, the endpoint MUST abort the initialization process and | |
5856 | * report the error to SCTP user. | |
5857 | * | |
5858 | * Outputs | |
5859 | * (timers, events) | |
5860 | * | |
5861 | */ | |
172a1599 XL |
5862 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5863 | struct net *net, | |
5864 | const struct sctp_endpoint *ep, | |
5865 | const struct sctp_association *asoc, | |
5866 | const union sctp_subtype type, | |
5867 | void *arg, | |
5868 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5869 | { |
3f7a87d2 | 5870 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5871 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5872 | |
bb33381d DB |
5873 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5874 | ||
b01a2407 | 5875 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5876 | |
81845c21 | 5877 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5878 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5879 | if (!repl) |
3f7a87d2 | 5880 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5881 | |
96cd0d3d VY |
5882 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5883 | SCTP_CHUNK(repl)); | |
1da177e4 | 5884 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5885 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5886 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5887 | ||
1da177e4 LT |
5888 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5889 | } else { | |
8de8c873 SS |
5890 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5891 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5892 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5893 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5894 | return SCTP_DISPOSITION_DELETE_TCB; |
5895 | } | |
5896 | ||
5897 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5898 | } |
5899 | ||
5900 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5901 | * with the updated last sequential TSN received from its peer. | |
5902 | * | |
5903 | * An endpoint should limit the number of retransmissions of the | |
5904 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. | |
5905 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5906 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5907 | * thus the association enters the CLOSED state). The reception of any | |
5908 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5909 | * chunks) should clear the endpoint's retransmission count and restart | |
5910 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5911 | * all of its queued DATA chunks that have not yet been sent. | |
5912 | */ | |
172a1599 XL |
5913 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5914 | struct net *net, | |
5915 | const struct sctp_endpoint *ep, | |
5916 | const struct sctp_association *asoc, | |
5917 | const union sctp_subtype type, | |
5918 | void *arg, | |
5919 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5920 | { |
5921 | struct sctp_chunk *reply = NULL; | |
5922 | ||
bb33381d DB |
5923 | pr_debug("%s: timer T2 expired\n", __func__); |
5924 | ||
b01a2407 | 5925 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5926 | |
58fbbed4 NH |
5927 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5928 | ||
1da177e4 | 5929 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5930 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5931 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
5932 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
5933 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5934 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5935 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5936 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5937 | return SCTP_DISPOSITION_DELETE_TCB; |
5938 | } | |
5939 | ||
5940 | switch (asoc->state) { | |
5941 | case SCTP_STATE_SHUTDOWN_SENT: | |
5942 | reply = sctp_make_shutdown(asoc, NULL); | |
5943 | break; | |
5944 | ||
5945 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
5946 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
5947 | break; | |
5948 | ||
5949 | default: | |
5950 | BUG(); | |
5951 | break; | |
3ff50b79 | 5952 | } |
1da177e4 LT |
5953 | |
5954 | if (!reply) | |
5955 | goto nomem; | |
5956 | ||
6345b199 WY |
5957 | /* Do some failure management (Section 8.2). |
5958 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
5959 | * do failure management. | |
5960 | */ | |
5961 | if (asoc->shutdown_last_sent_to) | |
5962 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5963 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
5964 | |
5965 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
5966 | * the T2-shutdown timer. | |
5967 | */ | |
5968 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5969 | ||
5970 | /* Restart the T2-shutdown timer. */ | |
5971 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5972 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5973 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5974 | return SCTP_DISPOSITION_CONSUME; | |
5975 | ||
5976 | nomem: | |
5977 | return SCTP_DISPOSITION_NOMEM; | |
5978 | } | |
5979 | ||
5980 | /* | |
5981 | * ADDIP Section 4.1 ASCONF CHunk Procedures | |
5982 | * If the T4 RTO timer expires the endpoint should do B1 to B5 | |
5983 | */ | |
172a1599 XL |
5984 | enum sctp_disposition sctp_sf_t4_timer_expire( |
5985 | struct net *net, | |
5986 | const struct sctp_endpoint *ep, | |
5987 | const struct sctp_association *asoc, | |
5988 | const union sctp_subtype type, | |
5989 | void *arg, | |
5990 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5991 | { |
5992 | struct sctp_chunk *chunk = asoc->addip_last_asconf; | |
5993 | struct sctp_transport *transport = chunk->transport; | |
5994 | ||
b01a2407 | 5995 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 5996 | |
1da177e4 LT |
5997 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
5998 | * detection on the appropriate destination address as defined in | |
5999 | * RFC2960 [5] section 8.1 and 8.2. | |
6000 | */ | |
10a43cea WY |
6001 | if (transport) |
6002 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
6003 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
6004 | |
6005 | /* Reconfig T4 timer and transport. */ | |
6006 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
6007 | ||
6008 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
6009 | * endpoint failure detection on the association as defined in | |
6010 | * RFC2960 [5] section 8.1 and 8.2. | |
6011 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
6012 | */ | |
6013 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
6014 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
6015 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
6016 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6017 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6018 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6019 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
6020 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6021 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6022 | return SCTP_DISPOSITION_ABORT; |
6023 | } | |
6024 | ||
6025 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
6026 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
6027 | * This is done in SCTP_CMD_STRIKE. | |
6028 | */ | |
6029 | ||
6030 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
6031 | * choose an alternate destination address (please refer to RFC2960 | |
6032 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 6033 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
6034 | * ASCONF sent. |
6035 | */ | |
6036 | sctp_chunk_hold(asoc->addip_last_asconf); | |
6037 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6038 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
6039 | ||
6040 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
6041 | * destination is selected, then the RTO used will be that of the new | |
6042 | * destination address. | |
6043 | */ | |
6044 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
6045 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
6046 | ||
6047 | return SCTP_DISPOSITION_CONSUME; | |
6048 | } | |
6049 | ||
6050 | /* sctpimpguide-05 Section 2.12.2 | |
6051 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
6052 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
6053 | * At the expiration of this timer the sender SHOULD abort the association | |
6054 | * by sending an ABORT chunk. | |
6055 | */ | |
172a1599 XL |
6056 | enum sctp_disposition sctp_sf_t5_timer_expire( |
6057 | struct net *net, | |
6058 | const struct sctp_endpoint *ep, | |
6059 | const struct sctp_association *asoc, | |
6060 | const union sctp_subtype type, | |
6061 | void *arg, | |
6062 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6063 | { |
6064 | struct sctp_chunk *reply = NULL; | |
6065 | ||
bb33381d DB |
6066 | pr_debug("%s: timer T5 expired\n", __func__); |
6067 | ||
b01a2407 | 6068 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
6069 | |
6070 | reply = sctp_make_abort(asoc, NULL, 0); | |
6071 | if (!reply) | |
6072 | goto nomem; | |
6073 | ||
6074 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
6075 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6076 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 6077 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6078 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 6079 | |
b01a2407 EB |
6080 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6081 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 6082 | |
1da177e4 LT |
6083 | return SCTP_DISPOSITION_DELETE_TCB; |
6084 | nomem: | |
6085 | return SCTP_DISPOSITION_NOMEM; | |
6086 | } | |
6087 | ||
6088 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
6089 | * the association is automatically closed by starting the shutdown process. | |
6090 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
6091 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
6092 | */ | |
172a1599 XL |
6093 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
6094 | struct net *net, | |
6095 | const struct sctp_endpoint *ep, | |
6096 | const struct sctp_association *asoc, | |
6097 | const union sctp_subtype type, | |
6098 | void *arg, | |
6099 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6100 | { |
172a1599 | 6101 | enum sctp_disposition disposition; |
1da177e4 | 6102 | |
b01a2407 | 6103 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 6104 | |
1da177e4 LT |
6105 | /* From 9.2 Shutdown of an Association |
6106 | * Upon receipt of the SHUTDOWN primitive from its upper | |
6107 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
6108 | * remains there until all outstanding data has been | |
6109 | * acknowledged by its peer. The endpoint accepts no new data | |
6110 | * from its upper layer, but retransmits data to the far end | |
6111 | * if necessary to fill gaps. | |
6112 | */ | |
6113 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
6114 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
6115 | ||
1da177e4 LT |
6116 | disposition = SCTP_DISPOSITION_CONSUME; |
6117 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 6118 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
04992bfd | 6119 | NULL, commands); |
1da177e4 | 6120 | } |
172a1599 | 6121 | |
1da177e4 LT |
6122 | return disposition; |
6123 | } | |
6124 | ||
6125 | /***************************************************************************** | |
6126 | * These are sa state functions which could apply to all types of events. | |
6127 | ****************************************************************************/ | |
6128 | ||
6129 | /* | |
6130 | * This table entry is not implemented. | |
6131 | * | |
6132 | * Inputs | |
6133 | * (endpoint, asoc, chunk) | |
6134 | * | |
6135 | * The return value is the disposition of the chunk. | |
6136 | */ | |
172a1599 XL |
6137 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
6138 | const struct sctp_endpoint *ep, | |
6139 | const struct sctp_association *asoc, | |
6140 | const union sctp_subtype type, | |
6141 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6142 | { |
6143 | return SCTP_DISPOSITION_NOT_IMPL; | |
6144 | } | |
6145 | ||
6146 | /* | |
6147 | * This table entry represents a bug. | |
6148 | * | |
6149 | * Inputs | |
6150 | * (endpoint, asoc, chunk) | |
6151 | * | |
6152 | * The return value is the disposition of the chunk. | |
6153 | */ | |
172a1599 XL |
6154 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6155 | const struct sctp_endpoint *ep, | |
6156 | const struct sctp_association *asoc, | |
6157 | const union sctp_subtype type, | |
6158 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6159 | { |
6160 | return SCTP_DISPOSITION_BUG; | |
6161 | } | |
6162 | ||
6163 | /* | |
6164 | * This table entry represents the firing of a timer in the wrong state. | |
6165 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6166 | * when the association is in the wrong state. This event should | |
6167 | * be ignored, so as to prevent any rearming of the timer. | |
6168 | * | |
6169 | * Inputs | |
6170 | * (endpoint, asoc, chunk) | |
6171 | * | |
6172 | * The return value is the disposition of the chunk. | |
6173 | */ | |
172a1599 XL |
6174 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6175 | const struct sctp_endpoint *ep, | |
6176 | const struct sctp_association *asoc, | |
6177 | const union sctp_subtype type, | |
6178 | void *arg, | |
6179 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6180 | { |
bb33381d DB |
6181 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6182 | ||
1da177e4 LT |
6183 | return SCTP_DISPOSITION_CONSUME; |
6184 | } | |
6185 | ||
6186 | /******************************************************************** | |
6187 | * 2nd Level Abstractions | |
6188 | ********************************************************************/ | |
6189 | ||
6190 | /* Pull the SACK chunk based on the SACK header. */ | |
6191 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6192 | { | |
6193 | struct sctp_sackhdr *sack; | |
172a1599 | 6194 | __u16 num_dup_tsns; |
1da177e4 LT |
6195 | unsigned int len; |
6196 | __u16 num_blocks; | |
1da177e4 LT |
6197 | |
6198 | /* Protect ourselves from reading too far into | |
6199 | * the skb from a bogus sender. | |
6200 | */ | |
6201 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6202 | ||
6203 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6204 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6205 | len = sizeof(struct sctp_sackhdr); | |
6206 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6207 | if (len > chunk->skb->len) | |
6208 | return NULL; | |
6209 | ||
6210 | skb_pull(chunk->skb, len); | |
6211 | ||
6212 | return sack; | |
6213 | } | |
6214 | ||
6215 | /* Create an ABORT packet to be sent as a response, with the specified | |
6216 | * error causes. | |
6217 | */ | |
172a1599 XL |
6218 | static struct sctp_packet *sctp_abort_pkt_new( |
6219 | struct net *net, | |
6220 | const struct sctp_endpoint *ep, | |
6221 | const struct sctp_association *asoc, | |
6222 | struct sctp_chunk *chunk, | |
6223 | const void *payload, size_t paylen) | |
1da177e4 LT |
6224 | { |
6225 | struct sctp_packet *packet; | |
6226 | struct sctp_chunk *abort; | |
6227 | ||
2ce95503 | 6228 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6229 | |
6230 | if (packet) { | |
6231 | /* Make an ABORT. | |
6232 | * The T bit will be set if the asoc is NULL. | |
6233 | */ | |
6234 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6235 | if (!abort) { | |
6236 | sctp_ootb_pkt_free(packet); | |
6237 | return NULL; | |
6238 | } | |
047a2428 JF |
6239 | |
6240 | /* Reflect vtag if T-Bit is set */ | |
6241 | if (sctp_test_T_bit(abort)) | |
6242 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6243 | ||
1da177e4 LT |
6244 | /* Add specified error causes, i.e., payload, to the |
6245 | * end of the chunk. | |
6246 | */ | |
6247 | sctp_addto_chunk(abort, paylen, payload); | |
6248 | ||
6249 | /* Set the skb to the belonging sock for accounting. */ | |
6250 | abort->skb->sk = ep->base.sk; | |
6251 | ||
6252 | sctp_packet_append_chunk(packet, abort); | |
6253 | ||
6254 | } | |
6255 | ||
6256 | return packet; | |
6257 | } | |
6258 | ||
6259 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6260 | static struct sctp_packet *sctp_ootb_pkt_new( |
6261 | struct net *net, | |
6262 | const struct sctp_association *asoc, | |
6263 | const struct sctp_chunk *chunk) | |
1da177e4 | 6264 | { |
1da177e4 | 6265 | struct sctp_transport *transport; |
172a1599 XL |
6266 | struct sctp_packet *packet; |
6267 | __u16 sport, dport; | |
1da177e4 LT |
6268 | __u32 vtag; |
6269 | ||
6270 | /* Get the source and destination port from the inbound packet. */ | |
6271 | sport = ntohs(chunk->sctp_hdr->dest); | |
6272 | dport = ntohs(chunk->sctp_hdr->source); | |
6273 | ||
6274 | /* The V-tag is going to be the same as the inbound packet if no | |
6275 | * association exists, otherwise, use the peer's vtag. | |
6276 | */ | |
6277 | if (asoc) { | |
02c4e12c WY |
6278 | /* Special case the INIT-ACK as there is no peer's vtag |
6279 | * yet. | |
6280 | */ | |
cb3f837b | 6281 | switch (chunk->chunk_hdr->type) { |
60ec9c7a | 6282 | case SCTP_CID_INIT: |
02c4e12c WY |
6283 | case SCTP_CID_INIT_ACK: |
6284 | { | |
cb1844c4 | 6285 | struct sctp_initack_chunk *initack; |
02c4e12c | 6286 | |
cb1844c4 | 6287 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6288 | vtag = ntohl(initack->init_hdr.init_tag); |
6289 | break; | |
6290 | } | |
6291 | default: | |
6292 | vtag = asoc->peer.i.init_tag; | |
6293 | break; | |
6294 | } | |
1da177e4 LT |
6295 | } else { |
6296 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6297 | * vtag yet. | |
6298 | */ | |
cb3f837b | 6299 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6300 | case SCTP_CID_INIT: |
6301 | { | |
01a992be | 6302 | struct sctp_init_chunk *init; |
1da177e4 | 6303 | |
01a992be | 6304 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6305 | vtag = ntohl(init->init_hdr.init_tag); |
6306 | break; | |
6307 | } | |
d808ad9a | 6308 | default: |
1da177e4 LT |
6309 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6310 | break; | |
6311 | } | |
6312 | } | |
6313 | ||
6314 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6315 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6316 | if (!transport) |
6317 | goto nomem; | |
6318 | ||
6319 | /* Cache a route for the transport with the chunk's destination as | |
6320 | * the source address. | |
6321 | */ | |
16b0a030 | 6322 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6323 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6324 | |
66b91d2c MRL |
6325 | packet = &transport->packet; |
6326 | sctp_packet_init(packet, transport, sport, dport); | |
6327 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6328 | |
6329 | return packet; | |
6330 | ||
6331 | nomem: | |
6332 | return NULL; | |
6333 | } | |
6334 | ||
6335 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6336 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6337 | { | |
6338 | sctp_transport_free(packet->transport); | |
6339 | } | |
6340 | ||
6341 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6342 | static void sctp_send_stale_cookie_err(struct net *net, |
6343 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6344 | const struct sctp_association *asoc, |
6345 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6346 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6347 | struct sctp_chunk *err_chunk) |
6348 | { | |
6349 | struct sctp_packet *packet; | |
6350 | ||
6351 | if (err_chunk) { | |
2ce95503 | 6352 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6353 | if (packet) { |
6354 | struct sctp_signed_cookie *cookie; | |
6355 | ||
6356 | /* Override the OOTB vtag from the cookie. */ | |
6357 | cookie = chunk->subh.cookie_hdr; | |
6358 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6359 | |
1da177e4 LT |
6360 | /* Set the skb to the belonging sock for accounting. */ |
6361 | err_chunk->skb->sk = ep->base.sk; | |
6362 | sctp_packet_append_chunk(packet, err_chunk); | |
6363 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6364 | SCTP_PACKET(packet)); | |
b01a2407 | 6365 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6366 | } else |
6367 | sctp_chunk_free (err_chunk); | |
6368 | } | |
6369 | } | |
6370 | ||
6371 | ||
6372 | /* Process a data chunk */ | |
6373 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6374 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6375 | struct sctp_cmd_seq *commands) |
1da177e4 | 6376 | { |
7c3ceb4f | 6377 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6378 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6379 | struct net *net = sock_net(sk); |
172a1599 XL |
6380 | struct sctp_datahdr *data_hdr; |
6381 | struct sctp_chunk *err; | |
6382 | enum sctp_verb deliver; | |
6383 | size_t datalen; | |
172a1599 XL |
6384 | __u32 tsn; |
6385 | int tmp; | |
1da177e4 | 6386 | |
3583df1a XL |
6387 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6388 | chunk->subh.data_hdr = data_hdr; | |
9d4ceaf1 | 6389 | skb_pull(chunk->skb, sctp_datahdr_len(&asoc->stream)); |
1da177e4 LT |
6390 | |
6391 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6392 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6393 | |
6394 | /* ASSERT: Now skb->data is really the user data. */ | |
6395 | ||
6396 | /* Process ECN based congestion. | |
6397 | * | |
6398 | * Since the chunk structure is reused for all chunks within | |
6399 | * a packet, we use ecn_ce_done to track if we've already | |
6400 | * done CE processing for this packet. | |
6401 | * | |
6402 | * We need to do ECN processing even if we plan to discard the | |
6403 | * chunk later. | |
6404 | */ | |
6405 | ||
2d47fd12 | 6406 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6407 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6408 | chunk->ecn_ce_done = 1; |
6409 | ||
2d47fd12 | 6410 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4 LT |
6411 | /* Do real work as sideffect. */ |
6412 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, | |
6413 | SCTP_U32(tsn)); | |
6414 | } | |
6415 | } | |
6416 | ||
6417 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6418 | if (tmp < 0) { | |
6419 | /* The TSN is too high--silently discard the chunk and | |
6420 | * count on it getting retransmitted later. | |
6421 | */ | |
196d6759 MB |
6422 | if (chunk->asoc) |
6423 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6424 | return SCTP_IERROR_HIGH_TSN; |
6425 | } else if (tmp > 0) { | |
6426 | /* This is a duplicate. Record it. */ | |
6427 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6428 | return SCTP_IERROR_DUP_TSN; | |
6429 | } | |
6430 | ||
6431 | /* This is a new TSN. */ | |
6432 | ||
6433 | /* Discard if there is no room in the receive window. | |
6434 | * Actually, allow a little bit of overflow (up to a MTU). | |
6435 | */ | |
6436 | datalen = ntohs(chunk->chunk_hdr->length); | |
9d4ceaf1 | 6437 | datalen -= sctp_datachk_len(&asoc->stream); |
1da177e4 LT |
6438 | |
6439 | deliver = SCTP_CMD_CHUNK_ULP; | |
6440 | ||
6441 | /* Think about partial delivery. */ | |
6442 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6443 | ||
6444 | /* Even if we don't accept this chunk there is | |
6445 | * memory pressure. | |
6446 | */ | |
6447 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6448 | } | |
6449 | ||
d808ad9a | 6450 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6451 | * seems a bit troublesome in that frag_point varies based on |
6452 | * PMTU. In cases, such as loopback, this might be a rather | |
6453 | * large spill over. | |
4d93df0a | 6454 | */ |
362d5204 | 6455 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6456 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6457 | |
6458 | /* If this is the next TSN, consider reneging to make | |
6459 | * room. Note: Playing nice with a confused sender. A | |
6460 | * malicious sender can still eat up all our buffer | |
6461 | * space and in the future we may want to detect and | |
6462 | * do more drastic reneging. | |
6463 | */ | |
7c3ceb4f NH |
6464 | if (sctp_tsnmap_has_gap(map) && |
6465 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6466 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6467 | deliver = SCTP_CMD_RENEGE; |
6468 | } else { | |
bb33381d DB |
6469 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6470 | __func__, tsn, datalen, asoc->rwnd); | |
6471 | ||
1da177e4 LT |
6472 | return SCTP_IERROR_IGNORE_TSN; |
6473 | } | |
6474 | } | |
6475 | ||
4d93df0a NH |
6476 | /* |
6477 | * Also try to renege to limit our memory usage in the event that | |
6478 | * we are under memory pressure | |
3ab224be | 6479 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6480 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6481 | * memory usage too much | |
6482 | */ | |
9dde27de | 6483 | if (sk_under_memory_pressure(sk)) { |
4d93df0a | 6484 | if (sctp_tsnmap_has_gap(map) && |
f7010e61 | 6485 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6486 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6487 | __func__, tsn); | |
4d93df0a | 6488 | deliver = SCTP_CMD_RENEGE; |
9dde27de XL |
6489 | } else { |
6490 | sk_mem_reclaim(sk); | |
6491 | } | |
4d93df0a NH |
6492 | } |
6493 | ||
1da177e4 LT |
6494 | /* |
6495 | * Section 3.3.10.9 No User Data (9) | |
6496 | * | |
6497 | * Cause of error | |
6498 | * --------------- | |
6499 | * No User Data: This error cause is returned to the originator of a | |
6500 | * DATA chunk if a received DATA chunk has no user data. | |
6501 | */ | |
6502 | if (unlikely(0 == datalen)) { | |
6503 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6504 | if (err) { | |
6505 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6506 | SCTP_CHUNK(err)); | |
6507 | } | |
6508 | /* We are going to ABORT, so we might as well stop | |
6509 | * processing the rest of the chunks in the packet. | |
6510 | */ | |
cb3f837b | 6511 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6512 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6513 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6514 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6515 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6516 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6517 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6518 | return SCTP_IERROR_NO_DATA; |
6519 | } | |
6520 | ||
9faa730f SS |
6521 | chunk->data_accepted = 1; |
6522 | ||
1da177e4 LT |
6523 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6524 | * if we renege and the chunk arrives again. | |
6525 | */ | |
196d6759 | 6526 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6527 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6528 | if (chunk->asoc) |
6529 | chunk->asoc->stats.iuodchunks++; | |
6530 | } else { | |
b01a2407 | 6531 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6532 | if (chunk->asoc) |
6533 | chunk->asoc->stats.iodchunks++; | |
f1751c57 | 6534 | } |
1da177e4 LT |
6535 | |
6536 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6537 | * | |
6538 | * If an endpoint receive a DATA chunk with an invalid stream | |
6539 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6540 | * following the normal procedure, immediately send an ERROR chunk | |
6541 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6542 | * and discard the DATA chunk. | |
6543 | */ | |
9d4ceaf1 | 6544 | if (ntohs(data_hdr->stream) >= asoc->stream.incnt) { |
3888e9ef VY |
6545 | /* Mark tsn as received even though we drop it */ |
6546 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6547 | ||
1da177e4 LT |
6548 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6549 | &data_hdr->stream, | |
6383cfb3 VY |
6550 | sizeof(data_hdr->stream), |
6551 | sizeof(u16)); | |
1da177e4 LT |
6552 | if (err) |
6553 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6554 | SCTP_CHUNK(err)); | |
6555 | return SCTP_IERROR_BAD_STREAM; | |
6556 | } | |
6557 | ||
f1751c57 VY |
6558 | /* Check to see if the SSN is possible for this TSN. |
6559 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6560 | * at an unsigned short, there is no way that an SSN can | |
6561 | * wrap and for a valid TSN. We can simply check if the current | |
6562 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6563 | * and is invalid. | |
6564 | */ | |
9d4ceaf1 | 6565 | if (!asoc->stream.si->validate_data(chunk)) |
f1751c57 | 6566 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6567 | |
1da177e4 LT |
6568 | /* Send the data up to the user. Note: Schedule the |
6569 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6570 | * chunk needs the updated rwnd. | |
6571 | */ | |
6572 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6573 | ||
6574 | return SCTP_IERROR_NO_ERROR; | |
6575 | } |