]>
Commit | Line | Data |
---|---|---|
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 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement that state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
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 | * Jon Grimm <jgrimm@austin.ibm.com> | |
21 | * Hui Huang <hui.huang@nokia.com> | |
22 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
23 | * Daisy Chang <daisyc@us.ibm.com> | |
24 | * Sridhar Samudrala <sri@us.ibm.com> | |
25 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
26 | */ |
27 | ||
145ce502 JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
1da177e4 LT |
30 | #include <linux/skbuff.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/ip.h> | |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
1da177e4 LT |
35 | #include <net/sock.h> |
36 | #include <net/sctp/sctp.h> | |
37 | #include <net/sctp/sm.h> | |
5bbbbe32 | 38 | #include <net/sctp/stream_sched.h> |
1da177e4 | 39 | |
88ee48c1 | 40 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 41 | union sctp_subtype subtype, |
52106019 | 42 | enum sctp_state state, |
1da177e4 LT |
43 | struct sctp_endpoint *ep, |
44 | struct sctp_association *asoc, | |
45 | void *event_arg, | |
172a1599 | 46 | enum sctp_disposition status, |
a85bbeb2 | 47 | struct sctp_cmd_seq *commands, |
dd0fc66f | 48 | gfp_t gfp); |
88ee48c1 | 49 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 50 | union sctp_subtype subtype, |
52106019 | 51 | enum sctp_state state, |
1da177e4 | 52 | struct sctp_endpoint *ep, |
649621e3 | 53 | struct sctp_association **asoc, |
1da177e4 | 54 | void *event_arg, |
172a1599 | 55 | enum sctp_disposition status, |
a85bbeb2 | 56 | struct sctp_cmd_seq *commands, |
dd0fc66f | 57 | gfp_t gfp); |
1da177e4 LT |
58 | |
59 | /******************************************************************** | |
60 | * Helper functions | |
61 | ********************************************************************/ | |
62 | ||
63 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 64 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
65 | __u32 lowest_tsn) |
66 | { | |
67 | /* Save the TSN away for comparison when we receive CWR */ | |
68 | ||
69 | asoc->last_ecne_tsn = lowest_tsn; | |
70 | asoc->need_ecne = 1; | |
71 | } | |
72 | ||
73 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
74 | /* RFC 2960 Appendix A | |
75 | * | |
76 | * RFC 2481 details a specific bit for a sender to send in | |
77 | * the header of its next outbound TCP segment to indicate to | |
78 | * its peer that it has reduced its congestion window. This | |
79 | * is termed the CWR bit. For SCTP the same indication is made | |
80 | * by including the CWR chunk. This chunk contains one data | |
81 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
82 | * This element represents the lowest TSN number in the datagram | |
83 | * that was originally marked with the CE bit. | |
84 | */ | |
85 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
172a1599 XL |
86 | __u32 lowest_tsn, |
87 | struct sctp_chunk *chunk) | |
1da177e4 LT |
88 | { |
89 | struct sctp_chunk *repl; | |
90 | ||
91 | /* Our previously transmitted packet ran into some congestion | |
92 | * so we should take action by reducing cwnd and ssthresh | |
93 | * and then ACK our peer that we we've done so by | |
94 | * sending a CWR. | |
95 | */ | |
96 | ||
97 | /* First, try to determine if we want to actually lower | |
98 | * our cwnd variables. Only lower them if the ECNE looks more | |
99 | * recent than the last response. | |
100 | */ | |
101 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
102 | struct sctp_transport *transport; | |
103 | ||
104 | /* Find which transport's congestion variables | |
105 | * need to be adjusted. | |
106 | */ | |
107 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
108 | ||
109 | /* Update the congestion variables. */ | |
110 | if (transport) | |
111 | sctp_transport_lower_cwnd(transport, | |
112 | SCTP_LOWER_CWND_ECNE); | |
113 | asoc->last_cwr_tsn = lowest_tsn; | |
114 | } | |
115 | ||
116 | /* Always try to quiet the other end. In case of lost CWR, | |
117 | * resend last_cwr_tsn. | |
118 | */ | |
119 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
120 | ||
121 | /* If we run out of memory, it will look like a lost CWR. We'll | |
122 | * get back in sync eventually. | |
123 | */ | |
124 | return repl; | |
125 | } | |
126 | ||
127 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
128 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
129 | __u32 lowest_tsn) | |
130 | { | |
131 | /* Turn off ECNE getting auto-prepended to every outgoing | |
132 | * packet | |
133 | */ | |
134 | asoc->need_ecne = 0; | |
135 | } | |
136 | ||
137 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
138 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
a85bbeb2 | 139 | struct sctp_cmd_seq *commands) |
1da177e4 | 140 | { |
172a1599 | 141 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
142 | __u32 ctsn, max_tsn_seen; |
143 | struct sctp_chunk *sack; | |
144 | int error = 0; | |
145 | ||
d808ad9a | 146 | if (force || |
52ccb8e9 FF |
147 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
148 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
149 | asoc->peer.sack_needed = 1; |
150 | ||
151 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
152 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
153 | ||
154 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
155 | * | |
156 | * Ack State : This flag indicates if the next received packet | |
157 | * : is to be responded to with a SACK. ... | |
158 | * : When DATA chunks are out of order, SACK's | |
159 | * : are not delayed (see Section 6). | |
160 | * | |
161 | * [This is actually not mentioned in Section 6, but we | |
162 | * implement it here anyway. --piggy] | |
163 | */ | |
d808ad9a | 164 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
165 | asoc->peer.sack_needed = 1; |
166 | ||
167 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
168 | * | |
169 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
170 | * an acknowledgement SHOULD be generated for at least every | |
171 | * second packet (not every second DATA chunk) received, and | |
172 | * SHOULD be generated within 200 ms of the arrival of any | |
173 | * unacknowledged DATA chunk. ... | |
174 | */ | |
175 | if (!asoc->peer.sack_needed) { | |
d364d927 | 176 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
177 | |
178 | /* Set the SACK delay timeout based on the | |
179 | * SACK delay for the last transport | |
180 | * data was received from, or the default | |
181 | * for the association. | |
182 | */ | |
d364d927 WY |
183 | if (trans) { |
184 | /* We will need a SACK for the next packet. */ | |
185 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
186 | asoc->peer.sack_needed = 1; | |
187 | ||
d808ad9a | 188 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 189 | trans->sackdelay; |
d364d927 WY |
190 | } else { |
191 | /* We will need a SACK for the next packet. */ | |
192 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
193 | asoc->peer.sack_needed = 1; | |
194 | ||
d808ad9a | 195 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 196 | asoc->sackdelay; |
d364d927 | 197 | } |
52ccb8e9 FF |
198 | |
199 | /* Restart the SACK timer. */ | |
200 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
201 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 202 | } else { |
07b4d6a1 MRL |
203 | __u32 old_a_rwnd = asoc->a_rwnd; |
204 | ||
90f2f531 | 205 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 206 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
207 | if (!sack) { |
208 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 209 | goto nomem; |
07b4d6a1 | 210 | } |
1da177e4 LT |
211 | |
212 | asoc->peer.sack_needed = 0; | |
d364d927 | 213 | asoc->peer.sack_cnt = 0; |
1da177e4 | 214 | |
732ba35e | 215 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
216 | |
217 | /* Stop the SACK timer. */ | |
218 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
219 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
220 | } | |
52ccb8e9 | 221 | |
1da177e4 LT |
222 | return error; |
223 | nomem: | |
224 | error = -ENOMEM; | |
225 | return error; | |
226 | } | |
227 | ||
228 | /* When the T3-RTX timer expires, it calls this function to create the | |
229 | * relevant state machine event. | |
230 | */ | |
9c3b5751 | 231 | void sctp_generate_t3_rtx_event(struct timer_list *t) |
1da177e4 | 232 | { |
9c3b5751 KC |
233 | struct sctp_transport *transport = |
234 | from_timer(transport, t, T3_rtx_timer); | |
1da177e4 | 235 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
236 | struct sock *sk = asoc->base.sk; |
237 | struct net *net = sock_net(sk); | |
172a1599 | 238 | int error; |
1da177e4 LT |
239 | |
240 | /* Check whether a task is in the sock. */ | |
241 | ||
635682a1 KH |
242 | bh_lock_sock(sk); |
243 | if (sock_owned_by_user(sk)) { | |
bb33381d | 244 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
245 | |
246 | /* Try again later. */ | |
247 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
248 | sctp_transport_hold(transport); | |
249 | goto out_unlock; | |
250 | } | |
251 | ||
1da177e4 | 252 | /* Run through the state machine. */ |
55e26eb9 | 253 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
254 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
255 | asoc->state, | |
256 | asoc->ep, asoc, | |
257 | transport, GFP_ATOMIC); | |
258 | ||
259 | if (error) | |
635682a1 | 260 | sk->sk_err = -error; |
1da177e4 LT |
261 | |
262 | out_unlock: | |
635682a1 | 263 | bh_unlock_sock(sk); |
1da177e4 LT |
264 | sctp_transport_put(transport); |
265 | } | |
266 | ||
267 | /* This is a sa interface for producing timeout events. It works | |
268 | * for timeouts which use the association as their parameter. | |
269 | */ | |
270 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
19cd1592 | 271 | enum sctp_event_timeout timeout_type) |
1da177e4 | 272 | { |
635682a1 KH |
273 | struct sock *sk = asoc->base.sk; |
274 | struct net *net = sock_net(sk); | |
1da177e4 LT |
275 | int error = 0; |
276 | ||
635682a1 KH |
277 | bh_lock_sock(sk); |
278 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
279 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
280 | timeout_type); | |
1da177e4 LT |
281 | |
282 | /* Try again later. */ | |
283 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
284 | sctp_association_hold(asoc); | |
285 | goto out_unlock; | |
286 | } | |
287 | ||
288 | /* Is this association really dead and just waiting around for | |
289 | * the timer to let go of the reference? | |
290 | */ | |
291 | if (asoc->base.dead) | |
292 | goto out_unlock; | |
293 | ||
294 | /* Run through the state machine. */ | |
55e26eb9 | 295 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
296 | SCTP_ST_TIMEOUT(timeout_type), |
297 | asoc->state, asoc->ep, asoc, | |
298 | (void *)timeout_type, GFP_ATOMIC); | |
299 | ||
300 | if (error) | |
635682a1 | 301 | sk->sk_err = -error; |
1da177e4 LT |
302 | |
303 | out_unlock: | |
635682a1 | 304 | bh_unlock_sock(sk); |
1da177e4 LT |
305 | sctp_association_put(asoc); |
306 | } | |
307 | ||
9c3b5751 | 308 | static void sctp_generate_t1_cookie_event(struct timer_list *t) |
1da177e4 | 309 | { |
9c3b5751 KC |
310 | struct sctp_association *asoc = |
311 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_COOKIE]); | |
312 | ||
1da177e4 LT |
313 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
314 | } | |
315 | ||
9c3b5751 | 316 | static void sctp_generate_t1_init_event(struct timer_list *t) |
1da177e4 | 317 | { |
9c3b5751 KC |
318 | struct sctp_association *asoc = |
319 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_INIT]); | |
320 | ||
1da177e4 LT |
321 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
322 | } | |
323 | ||
9c3b5751 | 324 | static void sctp_generate_t2_shutdown_event(struct timer_list *t) |
1da177e4 | 325 | { |
9c3b5751 KC |
326 | struct sctp_association *asoc = |
327 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN]); | |
328 | ||
1da177e4 LT |
329 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
330 | } | |
331 | ||
9c3b5751 | 332 | static void sctp_generate_t4_rto_event(struct timer_list *t) |
1da177e4 | 333 | { |
9c3b5751 KC |
334 | struct sctp_association *asoc = |
335 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T4_RTO]); | |
336 | ||
1da177e4 LT |
337 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
338 | } | |
339 | ||
9c3b5751 | 340 | static void sctp_generate_t5_shutdown_guard_event(struct timer_list *t) |
1da177e4 | 341 | { |
9c3b5751 KC |
342 | struct sctp_association *asoc = |
343 | from_timer(asoc, t, | |
344 | timers[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]); | |
345 | ||
d808ad9a | 346 | sctp_generate_timeout_event(asoc, |
1da177e4 LT |
347 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
348 | ||
349 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
350 | ||
9c3b5751 | 351 | static void sctp_generate_autoclose_event(struct timer_list *t) |
1da177e4 | 352 | { |
9c3b5751 KC |
353 | struct sctp_association *asoc = |
354 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_AUTOCLOSE]); | |
355 | ||
1da177e4 LT |
356 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
357 | } | |
358 | ||
359 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
360 | * sure that the transport is still valid. | |
361 | */ | |
9c3b5751 | 362 | void sctp_generate_heartbeat_event(struct timer_list *t) |
1da177e4 | 363 | { |
9c3b5751 | 364 | struct sctp_transport *transport = from_timer(transport, t, hb_timer); |
1da177e4 | 365 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
366 | struct sock *sk = asoc->base.sk; |
367 | struct net *net = sock_net(sk); | |
ba6f5e33 | 368 | u32 elapsed, timeout; |
172a1599 | 369 | int error = 0; |
1da177e4 | 370 | |
635682a1 KH |
371 | bh_lock_sock(sk); |
372 | if (sock_owned_by_user(sk)) { | |
bb33381d | 373 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
374 | |
375 | /* Try again later. */ | |
376 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
377 | sctp_transport_hold(transport); | |
378 | goto out_unlock; | |
379 | } | |
380 | ||
ba6f5e33 MRL |
381 | /* Check if we should still send the heartbeat or reschedule */ |
382 | elapsed = jiffies - transport->last_time_sent; | |
383 | timeout = sctp_transport_timeout(transport); | |
384 | if (elapsed < timeout) { | |
385 | elapsed = timeout - elapsed; | |
386 | if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) | |
387 | sctp_transport_hold(transport); | |
388 | goto out_unlock; | |
389 | } | |
390 | ||
55e26eb9 | 391 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
392 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
393 | asoc->state, asoc->ep, asoc, | |
394 | transport, GFP_ATOMIC); | |
395 | ||
f05940e6 | 396 | if (error) |
635682a1 | 397 | sk->sk_err = -error; |
1da177e4 LT |
398 | |
399 | out_unlock: | |
635682a1 | 400 | bh_unlock_sock(sk); |
1da177e4 LT |
401 | sctp_transport_put(transport); |
402 | } | |
403 | ||
50b5d6ad VY |
404 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
405 | * the correct state machine transition that will close the association. | |
406 | */ | |
9c3b5751 | 407 | void sctp_generate_proto_unreach_event(struct timer_list *t) |
50b5d6ad | 408 | { |
9c3b5751 KC |
409 | struct sctp_transport *transport = |
410 | from_timer(transport, t, proto_unreach_timer); | |
50b5d6ad | 411 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
412 | struct sock *sk = asoc->base.sk; |
413 | struct net *net = sock_net(sk); | |
cb3f837b | 414 | |
635682a1 KH |
415 | bh_lock_sock(sk); |
416 | if (sock_owned_by_user(sk)) { | |
bb33381d | 417 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
418 | |
419 | /* Try again later. */ | |
420 | if (!mod_timer(&transport->proto_unreach_timer, | |
421 | jiffies + (HZ/20))) | |
422 | sctp_association_hold(asoc); | |
423 | goto out_unlock; | |
424 | } | |
425 | ||
426 | /* Is this structure just waiting around for us to actually | |
427 | * get destroyed? | |
428 | */ | |
429 | if (asoc->base.dead) | |
430 | goto out_unlock; | |
431 | ||
55e26eb9 | 432 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
433 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
434 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
435 | ||
436 | out_unlock: | |
635682a1 | 437 | bh_unlock_sock(sk); |
50b5d6ad VY |
438 | sctp_association_put(asoc); |
439 | } | |
440 | ||
7b9438de | 441 | /* Handle the timeout of the RE-CONFIG timer. */ |
9c3b5751 | 442 | void sctp_generate_reconf_event(struct timer_list *t) |
7b9438de | 443 | { |
9c3b5751 KC |
444 | struct sctp_transport *transport = |
445 | from_timer(transport, t, reconf_timer); | |
7b9438de XL |
446 | struct sctp_association *asoc = transport->asoc; |
447 | struct sock *sk = asoc->base.sk; | |
448 | struct net *net = sock_net(sk); | |
449 | int error = 0; | |
450 | ||
451 | bh_lock_sock(sk); | |
452 | if (sock_owned_by_user(sk)) { | |
453 | pr_debug("%s: sock is busy\n", __func__); | |
454 | ||
455 | /* Try again later. */ | |
456 | if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20))) | |
457 | sctp_transport_hold(transport); | |
458 | goto out_unlock; | |
459 | } | |
460 | ||
461 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, | |
462 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF), | |
463 | asoc->state, asoc->ep, asoc, | |
464 | transport, GFP_ATOMIC); | |
465 | ||
466 | if (error) | |
467 | sk->sk_err = -error; | |
468 | ||
469 | out_unlock: | |
470 | bh_unlock_sock(sk); | |
471 | sctp_transport_put(transport); | |
472 | } | |
50b5d6ad | 473 | |
1da177e4 | 474 | /* Inject a SACK Timeout event into the state machine. */ |
9c3b5751 | 475 | static void sctp_generate_sack_event(struct timer_list *t) |
1da177e4 | 476 | { |
9c3b5751 KC |
477 | struct sctp_association *asoc = |
478 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_SACK]); | |
479 | ||
1da177e4 LT |
480 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
481 | } | |
482 | ||
483 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
9c3b5751 KC |
484 | [SCTP_EVENT_TIMEOUT_NONE] = NULL, |
485 | [SCTP_EVENT_TIMEOUT_T1_COOKIE] = sctp_generate_t1_cookie_event, | |
486 | [SCTP_EVENT_TIMEOUT_T1_INIT] = sctp_generate_t1_init_event, | |
487 | [SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = sctp_generate_t2_shutdown_event, | |
488 | [SCTP_EVENT_TIMEOUT_T3_RTX] = NULL, | |
489 | [SCTP_EVENT_TIMEOUT_T4_RTO] = sctp_generate_t4_rto_event, | |
490 | [SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] = | |
491 | sctp_generate_t5_shutdown_guard_event, | |
492 | [SCTP_EVENT_TIMEOUT_HEARTBEAT] = NULL, | |
493 | [SCTP_EVENT_TIMEOUT_RECONF] = NULL, | |
494 | [SCTP_EVENT_TIMEOUT_SACK] = sctp_generate_sack_event, | |
495 | [SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sctp_generate_autoclose_event, | |
1da177e4 LT |
496 | }; |
497 | ||
498 | ||
499 | /* RFC 2960 8.2 Path Failure Detection | |
500 | * | |
501 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
502 | * error counter for each of the destination transport addresses of the | |
503 | * peer endpoint. | |
504 | * | |
505 | * Each time the T3-rtx timer expires on any address, or when a | |
506 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
507 | * the error counter of that destination address will be incremented. | |
508 | * When the value in the error counter exceeds the protocol parameter | |
509 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
510 | * mark the destination transport address as inactive, and a | |
511 | * notification SHOULD be sent to the upper layer. | |
512 | * | |
513 | */ | |
a85bbeb2 | 514 | static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands, |
5aa93bcf | 515 | struct sctp_association *asoc, |
7e99013a VY |
516 | struct sctp_transport *transport, |
517 | int is_hb) | |
1da177e4 LT |
518 | { |
519 | /* The check for association's overall error counter exceeding the | |
520 | * threshold is done in the state function. | |
521 | */ | |
b9f84786 VY |
522 | /* We are here due to a timer expiration. If the timer was |
523 | * not a HEARTBEAT, then normal error tracking is done. | |
524 | * If the timer was a heartbeat, we only increment error counts | |
525 | * when we already have an outstanding HEARTBEAT that has not | |
526 | * been acknowledged. | |
25985edc | 527 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 528 | */ |
b9f84786 | 529 | if (!is_hb) { |
ad8fec17 | 530 | asoc->overall_error_count++; |
b9f84786 VY |
531 | if (transport->state != SCTP_INACTIVE) |
532 | transport->error_count++; | |
533 | } else if (transport->hb_sent) { | |
534 | if (transport->state != SCTP_UNCONFIRMED) | |
535 | asoc->overall_error_count++; | |
536 | if (transport->state != SCTP_INACTIVE) | |
537 | transport->error_count++; | |
538 | } | |
1da177e4 | 539 | |
5aa93bcf | 540 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 541 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
542 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
543 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 544 | */ |
4e7696d9 XL |
545 | if (asoc->base.net->sctp.pf_enable && |
546 | transport->state == SCTP_ACTIVE && | |
547 | transport->error_count < transport->pathmaxrxt && | |
548 | transport->error_count > transport->pf_retrans) { | |
5aa93bcf NH |
549 | |
550 | sctp_assoc_control_transport(asoc, transport, | |
551 | SCTP_TRANSPORT_PF, | |
552 | 0); | |
553 | ||
554 | /* Update the hb timer to resend a heartbeat every rto */ | |
ba6f5e33 | 555 | sctp_transport_reset_hb_timer(transport); |
5aa93bcf NH |
556 | } |
557 | ||
3f7a87d2 | 558 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 559 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
560 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
561 | __func__, asoc, &transport->ipaddr.sa); | |
562 | ||
1da177e4 LT |
563 | sctp_assoc_control_transport(asoc, transport, |
564 | SCTP_TRANSPORT_DOWN, | |
565 | SCTP_FAILED_THRESHOLD); | |
566 | } | |
567 | ||
34515e94 XL |
568 | if (transport->error_count > transport->ps_retrans && |
569 | asoc->peer.primary_path == transport && | |
570 | asoc->peer.active_path != transport) | |
571 | sctp_assoc_set_primary(asoc, asoc->peer.active_path); | |
572 | ||
1da177e4 LT |
573 | /* E2) For the destination address for which the timer |
574 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
575 | * maximum value discussed in rule C7 above (RTO.max) may be | |
576 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
577 | * |
578 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 579 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 580 | * that indicates that we have an outstanding HB. |
1da177e4 | 581 | */ |
7e99013a | 582 | if (!is_hb || transport->hb_sent) { |
faee47cd | 583 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 584 | sctp_max_rto(asoc, transport); |
faee47cd | 585 | } |
1da177e4 LT |
586 | } |
587 | ||
588 | /* Worker routine to handle INIT command failure. */ | |
a85bbeb2 | 589 | static void sctp_cmd_init_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 590 | struct sctp_association *asoc, |
95c96174 | 591 | unsigned int error) |
1da177e4 LT |
592 | { |
593 | struct sctp_ulpevent *event; | |
594 | ||
cb3f837b | 595 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 596 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
597 | GFP_ATOMIC); |
598 | ||
599 | if (event) | |
600 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
601 | SCTP_ULPEVENT(event)); | |
602 | ||
603 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
604 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
605 | ||
606 | /* SEND_FAILED sent later when cleaning up the association. */ | |
607 | asoc->outqueue.error = error; | |
608 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
609 | } | |
610 | ||
611 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
a85bbeb2 | 612 | static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 613 | struct sctp_association *asoc, |
88ee48c1 | 614 | enum sctp_event_type event_type, |
bfc6f827 | 615 | union sctp_subtype subtype, |
1da177e4 | 616 | struct sctp_chunk *chunk, |
95c96174 | 617 | unsigned int error) |
1da177e4 LT |
618 | { |
619 | struct sctp_ulpevent *event; | |
de4594a5 | 620 | struct sctp_chunk *abort; |
172a1599 | 621 | |
1da177e4 | 622 | /* Cancel any partial delivery in progress. */ |
65f5e357 | 623 | asoc->stream.si->abort_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 | 624 | |
a5a35e76 VY |
625 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
626 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
627 | (__u16)error, 0, 0, chunk, | |
628 | GFP_ATOMIC); | |
629 | else | |
630 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
631 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
632 | GFP_ATOMIC); |
633 | if (event) | |
634 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
635 | SCTP_ULPEVENT(event)); | |
636 | ||
de4594a5 NH |
637 | if (asoc->overall_error_count >= asoc->max_retrans) { |
638 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
639 | if (abort) | |
640 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
641 | SCTP_CHUNK(abort)); | |
642 | } | |
643 | ||
1da177e4 LT |
644 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
645 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
646 | ||
1da177e4 LT |
647 | /* SEND_FAILED sent later when cleaning up the association. */ |
648 | asoc->outqueue.error = error; | |
649 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
650 | } | |
651 | ||
652 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
653 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
654 | * since all other cases use "temporary" associations and can do all | |
655 | * their work in statefuns directly. | |
656 | */ | |
a85bbeb2 | 657 | static int sctp_cmd_process_init(struct sctp_cmd_seq *commands, |
1da177e4 LT |
658 | struct sctp_association *asoc, |
659 | struct sctp_chunk *chunk, | |
01a992be | 660 | struct sctp_init_chunk *peer_init, |
dd0fc66f | 661 | gfp_t gfp) |
1da177e4 LT |
662 | { |
663 | int error; | |
664 | ||
665 | /* We only process the init as a sideeffect in a single | |
666 | * case. This is when we process the INIT-ACK. If we | |
667 | * fail during INIT processing (due to malloc problems), | |
668 | * just return the error and stop processing the stack. | |
669 | */ | |
de6becdc | 670 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
671 | error = -ENOMEM; |
672 | else | |
673 | error = 0; | |
674 | ||
675 | return error; | |
676 | } | |
677 | ||
678 | /* Helper function to break out starting up of heartbeat timers. */ | |
a85bbeb2 | 679 | static void sctp_cmd_hb_timers_start(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
680 | struct sctp_association *asoc) |
681 | { | |
682 | struct sctp_transport *t; | |
1da177e4 LT |
683 | |
684 | /* Start a heartbeat timer for each transport on the association. | |
685 | * hold a reference on the transport to make sure none of | |
686 | * the needed data structures go away. | |
687 | */ | |
ba6f5e33 MRL |
688 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) |
689 | sctp_transport_reset_hb_timer(t); | |
1da177e4 LT |
690 | } |
691 | ||
a85bbeb2 | 692 | static void sctp_cmd_hb_timers_stop(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
693 | struct sctp_association *asoc) |
694 | { | |
695 | struct sctp_transport *t; | |
1da177e4 LT |
696 | |
697 | /* Stop all heartbeat timers. */ | |
698 | ||
9dbc15f0 RD |
699 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
700 | transports) { | |
1da177e4 LT |
701 | if (del_timer(&t->hb_timer)) |
702 | sctp_transport_put(t); | |
703 | } | |
704 | } | |
705 | ||
706 | /* Helper function to stop any pending T3-RTX timers */ | |
a85bbeb2 | 707 | static void sctp_cmd_t3_rtx_timers_stop(struct sctp_cmd_seq *cmds, |
d808ad9a | 708 | struct sctp_association *asoc) |
1da177e4 LT |
709 | { |
710 | struct sctp_transport *t; | |
1da177e4 | 711 | |
9dbc15f0 RD |
712 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
713 | transports) { | |
25cc4ae9 | 714 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 715 | sctp_transport_put(t); |
1da177e4 LT |
716 | } |
717 | } | |
718 | ||
719 | ||
1da177e4 | 720 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
a85bbeb2 | 721 | static void sctp_cmd_transport_on(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
722 | struct sctp_association *asoc, |
723 | struct sctp_transport *t, | |
724 | struct sctp_chunk *chunk) | |
725 | { | |
edf903f8 | 726 | struct sctp_sender_hb_info *hbinfo; |
34d2d89f | 727 | int was_unconfirmed = 0; |
1da177e4 LT |
728 | |
729 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
730 | * HEARTBEAT should clear the error counter of the destination | |
731 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
732 | */ |
733 | t->error_count = 0; | |
f8d96052 TG |
734 | |
735 | /* | |
736 | * Although RFC4960 specifies that the overall error count must | |
737 | * be cleared when a HEARTBEAT ACK is received, we make an | |
738 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
739 | * window shut forever, we may never be able to transmit our | |
740 | * outstanding data and rely on the retransmission limit be reached | |
741 | * to shutdown the association. | |
742 | */ | |
f648f807 | 743 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 744 | t->asoc->overall_error_count = 0; |
1da177e4 | 745 | |
faee47cd VY |
746 | /* Clear the hb_sent flag to signal that we had a good |
747 | * acknowledgement. | |
748 | */ | |
749 | t->hb_sent = 0; | |
750 | ||
1da177e4 LT |
751 | /* Mark the destination transport address as active if it is not so |
752 | * marked. | |
753 | */ | |
34d2d89f MH |
754 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
755 | was_unconfirmed = 1; | |
1da177e4 LT |
756 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
757 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 758 | } |
1da177e4 | 759 | |
5aa93bcf NH |
760 | if (t->state == SCTP_PF) |
761 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
762 | SCTP_HEARTBEAT_SUCCESS); | |
763 | ||
8c2f414a DB |
764 | /* HB-ACK was received for a the proper HB. Consider this |
765 | * forward progress. | |
766 | */ | |
767 | if (t->dst) | |
c86a773c | 768 | sctp_transport_dst_confirm(t); |
8c2f414a | 769 | |
1da177e4 LT |
770 | /* The receiver of the HEARTBEAT ACK should also perform an |
771 | * RTT measurement for that destination transport address | |
772 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
773 | * If the transport's rto_pending variable has been cleared, |
774 | * it was most likely due to a retransmit. However, we want | |
775 | * to re-enable it to properly update the rto. | |
1da177e4 | 776 | */ |
e533ca16 VY |
777 | if (t->rto_pending == 0) |
778 | t->rto_pending = 1; | |
779 | ||
edf903f8 | 780 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
1da177e4 | 781 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
ad8fec17 SS |
782 | |
783 | /* Update the heartbeat timer. */ | |
ba6f5e33 | 784 | sctp_transport_reset_hb_timer(t); |
34d2d89f MH |
785 | |
786 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
787 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
788 | } |
789 | ||
1da177e4 LT |
790 | |
791 | /* Helper function to process the process SACK command. */ | |
a85bbeb2 | 792 | static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds, |
1da177e4 | 793 | struct sctp_association *asoc, |
edfee033 | 794 | struct sctp_chunk *chunk) |
1da177e4 | 795 | { |
2e3216cd | 796 | int err = 0; |
1da177e4 | 797 | |
edfee033 | 798 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
1da177e4 | 799 | /* There are no more TSNs awaiting SACK. */ |
4e7696d9 | 800 | err = sctp_do_sm(asoc->base.net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
801 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
802 | asoc->state, asoc->ep, asoc, NULL, | |
803 | GFP_ATOMIC); | |
1da177e4 LT |
804 | } |
805 | ||
806 | return err; | |
807 | } | |
808 | ||
809 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
810 | * the transport for a shutdown chunk. | |
811 | */ | |
a85bbeb2 | 812 | static void sctp_cmd_setup_t2(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
813 | struct sctp_association *asoc, |
814 | struct sctp_chunk *chunk) | |
815 | { | |
816 | struct sctp_transport *t; | |
817 | ||
c17b02b3 VY |
818 | if (chunk->transport) |
819 | t = chunk->transport; | |
820 | else { | |
821 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 822 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
823 | chunk->transport = t; |
824 | } | |
1da177e4 LT |
825 | asoc->shutdown_last_sent_to = t; |
826 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
827 | } |
828 | ||
a85bbeb2 | 829 | static void sctp_cmd_assoc_update(struct sctp_cmd_seq *cmds, |
5ee8aa68 XL |
830 | struct sctp_association *asoc, |
831 | struct sctp_association *new) | |
832 | { | |
4e7696d9 | 833 | struct net *net = asoc->base.net; |
5ee8aa68 XL |
834 | struct sctp_chunk *abort; |
835 | ||
836 | if (!sctp_assoc_update(asoc, new)) | |
837 | return; | |
838 | ||
d8238d9d | 839 | abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr)); |
5ee8aa68 XL |
840 | if (abort) { |
841 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
842 | sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
843 | } | |
844 | sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
845 | sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED, | |
846 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
847 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
848 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
849 | } | |
850 | ||
1da177e4 | 851 | /* Helper function to change the state of an association. */ |
a85bbeb2 | 852 | static void sctp_cmd_new_state(struct sctp_cmd_seq *cmds, |
1da177e4 | 853 | struct sctp_association *asoc, |
52106019 | 854 | enum sctp_state state) |
1da177e4 LT |
855 | { |
856 | struct sock *sk = asoc->base.sk; | |
857 | ||
858 | asoc->state = state; | |
859 | ||
bb33381d | 860 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 861 | |
1da177e4 | 862 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 863 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 864 | * successfully completed a connect() call. |
1da177e4 LT |
865 | */ |
866 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
cbabf463 | 867 | inet_sk_set_state(sk, SCTP_SS_ESTABLISHED); |
1da177e4 LT |
868 | |
869 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
870 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
d46e416c | 871 | sctp_sstate(sk, ESTABLISHED)) { |
cbabf463 | 872 | inet_sk_set_state(sk, SCTP_SS_CLOSING); |
1da177e4 | 873 | sk->sk_shutdown |= RCV_SHUTDOWN; |
d46e416c | 874 | } |
1da177e4 LT |
875 | } |
876 | ||
3f7a87d2 FF |
877 | if (sctp_state(asoc, COOKIE_WAIT)) { |
878 | /* Reset init timeouts since they may have been | |
879 | * increased due to timer expirations. | |
880 | */ | |
881 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 882 | asoc->rto_initial; |
3f7a87d2 | 883 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 884 | asoc->rto_initial; |
3f7a87d2 FF |
885 | } |
886 | ||
0a8dd9f6 NH |
887 | if (sctp_state(asoc, ESTABLISHED)) { |
888 | kfree(asoc->peer.cookie); | |
889 | asoc->peer.cookie = NULL; | |
890 | } | |
891 | ||
1da177e4 LT |
892 | if (sctp_state(asoc, ESTABLISHED) || |
893 | sctp_state(asoc, CLOSED) || | |
894 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
895 | /* Wake up any processes waiting in the asoc's wait queue in | |
896 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 897 | */ |
1da177e4 LT |
898 | if (waitqueue_active(&asoc->wait)) |
899 | wake_up_interruptible(&asoc->wait); | |
900 | ||
901 | /* Wake up any processes waiting in the sk's sleep queue of | |
902 | * a TCP-style or UDP-style peeled-off socket in | |
903 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
904 | * For a UDP-style socket, the waiters are woken up by the | |
905 | * notifications. | |
906 | */ | |
907 | if (!sctp_style(sk, UDP)) | |
908 | sk->sk_state_change(sk); | |
909 | } | |
b7018d0b XL |
910 | |
911 | if (sctp_state(asoc, SHUTDOWN_PENDING) && | |
912 | !sctp_outq_is_empty(&asoc->outqueue)) | |
913 | sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC); | |
1da177e4 LT |
914 | } |
915 | ||
916 | /* Helper function to delete an association. */ | |
a85bbeb2 | 917 | static void sctp_cmd_delete_tcb(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
918 | struct sctp_association *asoc) |
919 | { | |
920 | struct sock *sk = asoc->base.sk; | |
921 | ||
922 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 923 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 924 | * can pick it up later. |
d808ad9a | 925 | */ |
1da177e4 LT |
926 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
927 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
928 | return; | |
929 | ||
1da177e4 LT |
930 | sctp_association_free(asoc); |
931 | } | |
932 | ||
933 | /* | |
934 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
935 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
936 | * destination address (we use active path instead of primary path just | |
d808ad9a | 937 | * because primary path may be inactive. |
1da177e4 | 938 | */ |
a85bbeb2 XL |
939 | static void sctp_cmd_setup_t4(struct sctp_cmd_seq *cmds, |
940 | struct sctp_association *asoc, | |
941 | struct sctp_chunk *chunk) | |
1da177e4 LT |
942 | { |
943 | struct sctp_transport *t; | |
944 | ||
9919b455 | 945 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
946 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
947 | chunk->transport = t; | |
948 | } | |
949 | ||
d808ad9a | 950 | /* Process an incoming Operation Error Chunk. */ |
a85bbeb2 | 951 | static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
952 | struct sctp_association *asoc, |
953 | struct sctp_chunk *chunk) | |
954 | { | |
1da177e4 | 955 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
956 | struct sctp_ulpevent *ev; |
957 | ||
958 | while (chunk->chunk_end > chunk->skb->data) { | |
959 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
960 | ||
961 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
962 | GFP_ATOMIC); | |
963 | if (!ev) | |
964 | return; | |
965 | ||
9162e0ed | 966 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
3df26787 WY |
967 | |
968 | switch (err_hdr->cause) { | |
969 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
970 | { | |
922dbc5b | 971 | struct sctp_chunkhdr *unk_chunk_hdr; |
3df26787 | 972 | |
922dbc5b XL |
973 | unk_chunk_hdr = (struct sctp_chunkhdr *) |
974 | err_hdr->variable; | |
3df26787 WY |
975 | switch (unk_chunk_hdr->type) { |
976 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
977 | * an ERROR chunk reporting that it did not recognized | |
978 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
979 | * NOT send any further ASCONF chunks and MUST stop its | |
980 | * T-4 timer. | |
981 | */ | |
982 | case SCTP_CID_ASCONF: | |
983 | if (asoc->peer.asconf_capable == 0) | |
984 | break; | |
985 | ||
986 | asoc->peer.asconf_capable = 0; | |
987 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 988 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
989 | break; |
990 | default: | |
991 | break; | |
992 | } | |
1da177e4 | 993 | break; |
3df26787 | 994 | } |
1da177e4 LT |
995 | default: |
996 | break; | |
997 | } | |
1da177e4 LT |
998 | } |
999 | } | |
1000 | ||
d808ad9a | 1001 | /* Helper function to remove the association non-primary peer |
1da177e4 | 1002 | * transports. |
d808ad9a | 1003 | */ |
1da177e4 LT |
1004 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
1005 | { | |
1006 | struct sctp_transport *t; | |
1da177e4 | 1007 | struct list_head *temp; |
172a1599 | 1008 | struct list_head *pos; |
1da177e4 LT |
1009 | |
1010 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1011 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 1012 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 1013 | &asoc->peer.primary_addr)) { |
73e67420 | 1014 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
1015 | } |
1016 | } | |
1da177e4 LT |
1017 | } |
1018 | ||
8de8c873 SS |
1019 | /* Helper function to set sk_err on a 1-1 style socket. */ |
1020 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
1021 | { | |
1022 | struct sock *sk = asoc->base.sk; | |
1023 | ||
1024 | if (!sctp_style(sk, UDP)) | |
1025 | sk->sk_err = error; | |
1026 | } | |
1027 | ||
07d93967 | 1028 | /* Helper function to generate an association change event */ |
a85bbeb2 XL |
1029 | static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands, |
1030 | struct sctp_association *asoc, | |
1031 | u8 state) | |
07d93967 VY |
1032 | { |
1033 | struct sctp_ulpevent *ev; | |
1034 | ||
1035 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
1036 | asoc->c.sinit_num_ostreams, | |
1037 | asoc->c.sinit_max_instreams, | |
1038 | NULL, GFP_ATOMIC); | |
1039 | if (ev) | |
9162e0ed | 1040 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1041 | } |
1042 | ||
30f6ebf6 XL |
1043 | static void sctp_cmd_peer_no_auth(struct sctp_cmd_seq *commands, |
1044 | struct sctp_association *asoc) | |
1045 | { | |
1046 | struct sctp_ulpevent *ev; | |
1047 | ||
1048 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, GFP_ATOMIC); | |
1049 | if (ev) | |
1050 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
1051 | } | |
1052 | ||
07d93967 | 1053 | /* Helper function to generate an adaptation indication event */ |
a85bbeb2 | 1054 | static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands, |
07d93967 VY |
1055 | struct sctp_association *asoc) |
1056 | { | |
1057 | struct sctp_ulpevent *ev; | |
1058 | ||
1059 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1060 | ||
1061 | if (ev) | |
9162e0ed | 1062 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1063 | } |
1064 | ||
96cd0d3d VY |
1065 | |
1066 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
19cd1592 XL |
1067 | enum sctp_event_timeout timer, |
1068 | char *name) | |
96cd0d3d VY |
1069 | { |
1070 | struct sctp_transport *t; | |
1071 | ||
1072 | t = asoc->init_last_sent_to; | |
1073 | asoc->init_err_counter++; | |
1074 | ||
1075 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1076 | asoc->timeouts[timer] *= 2; | |
1077 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1078 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1079 | } | |
1080 | asoc->init_cycle++; | |
bb33381d DB |
1081 | |
1082 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1083 | " cycle:%d timeout:%ld\n", __func__, name, | |
1084 | asoc->init_err_counter, asoc->init_cycle, | |
1085 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1086 | } |
1087 | ||
1088 | } | |
1089 | ||
9c5c62be VY |
1090 | /* Send the whole message, chunk by chunk, to the outqueue. |
1091 | * This way the whole message is queued up and bundling if | |
1092 | * encouraged for small fragments. | |
1093 | */ | |
66388f2c XL |
1094 | static void sctp_cmd_send_msg(struct sctp_association *asoc, |
1095 | struct sctp_datamsg *msg, gfp_t gfp) | |
9c5c62be VY |
1096 | { |
1097 | struct sctp_chunk *chunk; | |
9c5c62be | 1098 | |
66388f2c XL |
1099 | list_for_each_entry(chunk, &msg->chunks, frag_list) |
1100 | sctp_outq_tail(&asoc->outqueue, chunk, gfp); | |
5bbbbe32 MRL |
1101 | |
1102 | asoc->outqueue.sched->enqueue(&asoc->outqueue, msg); | |
9c5c62be VY |
1103 | } |
1104 | ||
1105 | ||
1da177e4 LT |
1106 | /* These three macros allow us to pull the debugging code out of the |
1107 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1108 | * functionality there. | |
1109 | */ | |
bb33381d DB |
1110 | #define debug_pre_sfn() \ |
1111 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1112 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1113 | asoc, sctp_state_tbl[state], state_fn->name) | |
1114 | ||
1115 | #define debug_post_sfn() \ | |
1116 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1117 | sctp_status_tbl[status]) | |
1118 | ||
1119 | #define debug_post_sfx() \ | |
1120 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1121 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1122 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1123 | |
1124 | /* | |
1125 | * This is the master state machine processing function. | |
1126 | * | |
1127 | * If you want to understand all of lksctp, this is a | |
1128 | * good place to start. | |
1129 | */ | |
88ee48c1 | 1130 | int sctp_do_sm(struct net *net, enum sctp_event_type event_type, |
bfc6f827 | 1131 | union sctp_subtype subtype, enum sctp_state state, |
61f0eb07 XL |
1132 | struct sctp_endpoint *ep, struct sctp_association *asoc, |
1133 | void *event_arg, gfp_t gfp) | |
1da177e4 | 1134 | { |
bfc6f827 | 1135 | typedef const char *(printfn_t)(union sctp_subtype); |
1da177e4 LT |
1136 | static printfn_t *table[] = { |
1137 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1138 | }; | |
1139 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
172a1599 XL |
1140 | const struct sctp_sm_table_entry *state_fn; |
1141 | struct sctp_cmd_seq commands; | |
1142 | enum sctp_disposition status; | |
1143 | int error = 0; | |
1da177e4 LT |
1144 | |
1145 | /* Look up the state function, run it, and then process the | |
1146 | * side effects. These three steps are the heart of lksctp. | |
1147 | */ | |
55e26eb9 | 1148 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1149 | |
1150 | sctp_init_cmd_seq(&commands); | |
1151 | ||
bb33381d | 1152 | debug_pre_sfn(); |
131334d0 | 1153 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1154 | debug_post_sfn(); |
1da177e4 LT |
1155 | |
1156 | error = sctp_side_effects(event_type, subtype, state, | |
649621e3 | 1157 | ep, &asoc, event_arg, status, |
1da177e4 | 1158 | &commands, gfp); |
bb33381d | 1159 | debug_post_sfx(); |
1da177e4 LT |
1160 | |
1161 | return error; | |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | /***************************************************************** |
1165 | * This the master state function side effect processing function. | |
1166 | *****************************************************************/ | |
88ee48c1 | 1167 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 1168 | union sctp_subtype subtype, |
52106019 | 1169 | enum sctp_state state, |
1da177e4 | 1170 | struct sctp_endpoint *ep, |
649621e3 | 1171 | struct sctp_association **asoc, |
1da177e4 | 1172 | void *event_arg, |
172a1599 | 1173 | enum sctp_disposition status, |
a85bbeb2 | 1174 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1175 | gfp_t gfp) |
1da177e4 LT |
1176 | { |
1177 | int error; | |
1178 | ||
1179 | /* FIXME - Most of the dispositions left today would be categorized | |
1180 | * as "exceptional" dispositions. For those dispositions, it | |
1181 | * may not be proper to run through any of the commands at all. | |
1182 | * For example, the command interpreter might be run only with | |
1183 | * disposition SCTP_DISPOSITION_CONSUME. | |
1184 | */ | |
1185 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1186 | ep, *asoc, |
1da177e4 LT |
1187 | event_arg, status, |
1188 | commands, gfp))) | |
1189 | goto bail; | |
1190 | ||
1191 | switch (status) { | |
1192 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1193 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1194 | "event_type:%d, event_id:%d\n", __func__, state, | |
1195 | event_type, subtype.chunk); | |
1da177e4 LT |
1196 | break; |
1197 | ||
1198 | case SCTP_DISPOSITION_NOMEM: | |
1199 | /* We ran out of memory, so we need to discard this | |
1200 | * packet. | |
1201 | */ | |
1202 | /* BUG--we should now recover some memory, probably by | |
1203 | * reneging... | |
1204 | */ | |
1205 | error = -ENOMEM; | |
1206 | break; | |
1207 | ||
d808ad9a | 1208 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1209 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1210 | /* This should now be a command. */ |
649621e3 | 1211 | *asoc = NULL; |
1da177e4 LT |
1212 | break; |
1213 | ||
1214 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1215 | /* |
1216 | * We should no longer have much work to do here as the | |
1217 | * real work has been done as explicit commands above. | |
1218 | */ | |
1219 | break; | |
1220 | ||
1221 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1222 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1223 | state, subtype.chunk); | |
1da177e4 LT |
1224 | break; |
1225 | ||
1226 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1227 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1228 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1229 | break; |
1230 | ||
1231 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1232 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1233 | state, event_type, subtype.chunk); |
1234 | BUG(); | |
1235 | break; | |
1236 | ||
1237 | default: | |
145ce502 | 1238 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1239 | status, state, event_type, subtype.chunk); |
1240 | BUG(); | |
1241 | break; | |
3ff50b79 | 1242 | } |
1da177e4 LT |
1243 | |
1244 | bail: | |
1245 | return error; | |
1246 | } | |
1247 | ||
1248 | /******************************************************************** | |
1249 | * 2nd Level Abstractions | |
1250 | ********************************************************************/ | |
1251 | ||
1252 | /* This is the side-effect interpreter. */ | |
88ee48c1 | 1253 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 1254 | union sctp_subtype subtype, |
52106019 | 1255 | enum sctp_state state, |
1da177e4 LT |
1256 | struct sctp_endpoint *ep, |
1257 | struct sctp_association *asoc, | |
1258 | void *event_arg, | |
172a1599 | 1259 | enum sctp_disposition status, |
a85bbeb2 | 1260 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1261 | gfp_t gfp) |
1da177e4 | 1262 | { |
172a1599 XL |
1263 | struct sctp_sock *sp = sctp_sk(ep->base.sk); |
1264 | struct sctp_chunk *chunk = NULL, *new_obj; | |
1da177e4 | 1265 | struct sctp_packet *packet; |
172a1599 | 1266 | struct sctp_sackhdr sackh; |
1da177e4 | 1267 | struct timer_list *timer; |
1da177e4 | 1268 | struct sctp_transport *t; |
172a1599 XL |
1269 | unsigned long timeout; |
1270 | struct sctp_cmd *cmd; | |
1da177e4 | 1271 | int local_cork = 0; |
172a1599 XL |
1272 | int error = 0; |
1273 | int force; | |
1da177e4 LT |
1274 | |
1275 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1276 | chunk = event_arg; |
1da177e4 LT |
1277 | |
1278 | /* Note: This whole file is a huge candidate for rework. | |
1279 | * For example, each command could either have its own handler, so | |
1280 | * the loop would look like: | |
1281 | * while (cmds) | |
1282 | * cmd->handle(x, y, z) | |
1283 | * --jgrimm | |
1284 | */ | |
1285 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1286 | switch (cmd->verb) { | |
1287 | case SCTP_CMD_NOP: | |
1288 | /* Do nothing. */ | |
1289 | break; | |
1290 | ||
1291 | case SCTP_CMD_NEW_ASOC: | |
1292 | /* Register a new association. */ | |
1293 | if (local_cork) { | |
cea8768f | 1294 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1295 | local_cork = 0; |
1296 | } | |
f9e42b85 | 1297 | |
1da177e4 | 1298 | /* Register with the endpoint. */ |
f9e42b85 DB |
1299 | asoc = cmd->obj.asoc; |
1300 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1301 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1302 | break; |
1303 | ||
1304 | case SCTP_CMD_UPDATE_ASSOC: | |
5ee8aa68 | 1305 | sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc); |
1da177e4 LT |
1306 | break; |
1307 | ||
1308 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1309 | sctp_outq_teardown(&asoc->outqueue); | |
1310 | break; | |
1311 | ||
d808ad9a | 1312 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1313 | if (local_cork) { |
cea8768f | 1314 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1315 | local_cork = 0; |
1316 | } | |
1317 | /* Delete the current association. */ | |
1318 | sctp_cmd_delete_tcb(commands, asoc); | |
1319 | asoc = NULL; | |
1320 | break; | |
1321 | ||
1322 | case SCTP_CMD_NEW_STATE: | |
1323 | /* Enter a new state. */ | |
1324 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1325 | break; | |
1326 | ||
1327 | case SCTP_CMD_REPORT_TSN: | |
1328 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1329 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1330 | cmd->obj.u32, NULL); |
1da177e4 LT |
1331 | break; |
1332 | ||
1333 | case SCTP_CMD_REPORT_FWDTSN: | |
47b20a88 | 1334 | asoc->stream.si->report_ftsn(&asoc->ulpq, cmd->obj.u32); |
1da177e4 LT |
1335 | break; |
1336 | ||
1337 | case SCTP_CMD_PROCESS_FWDTSN: | |
de60fe91 XL |
1338 | asoc->stream.si->handle_ftsn(&asoc->ulpq, |
1339 | cmd->obj.chunk); | |
d808ad9a | 1340 | break; |
1da177e4 LT |
1341 | |
1342 | case SCTP_CMD_GEN_SACK: | |
1343 | /* Generate a Selective ACK. | |
1344 | * The argument tells us whether to just count | |
1345 | * the packet and MAYBE generate a SACK, or | |
1346 | * force a SACK out. | |
1347 | */ | |
1348 | force = cmd->obj.i32; | |
1349 | error = sctp_gen_sack(asoc, force, commands); | |
1350 | break; | |
1351 | ||
1352 | case SCTP_CMD_PROCESS_SACK: | |
1353 | /* Process an inbound SACK. */ | |
1354 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1355 | cmd->obj.chunk); |
1da177e4 LT |
1356 | break; |
1357 | ||
1358 | case SCTP_CMD_GEN_INIT_ACK: | |
1359 | /* Generate an INIT ACK chunk. */ | |
1360 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1361 | 0); | |
be7a7729 XL |
1362 | if (!new_obj) { |
1363 | error = -ENOMEM; | |
1364 | break; | |
1365 | } | |
1da177e4 LT |
1366 | |
1367 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1368 | SCTP_CHUNK(new_obj)); | |
1369 | break; | |
1370 | ||
1371 | case SCTP_CMD_PEER_INIT: | |
1372 | /* Process a unified INIT from the peer. | |
1373 | * Note: Only used during INIT-ACK processing. If | |
1374 | * there is an error just return to the outter | |
1375 | * layer which will bail. | |
1376 | */ | |
1377 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1378 | cmd->obj.init, gfp); |
1da177e4 LT |
1379 | break; |
1380 | ||
1381 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1382 | /* Generate a COOKIE ECHO chunk. */ | |
1383 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1384 | if (!new_obj) { | |
b26ddd81 NH |
1385 | if (cmd->obj.chunk) |
1386 | sctp_chunk_free(cmd->obj.chunk); | |
be7a7729 XL |
1387 | error = -ENOMEM; |
1388 | break; | |
1da177e4 LT |
1389 | } |
1390 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1391 | SCTP_CHUNK(new_obj)); | |
1392 | ||
1393 | /* If there is an ERROR chunk to be sent along with | |
1394 | * the COOKIE_ECHO, send it, too. | |
1395 | */ | |
b26ddd81 | 1396 | if (cmd->obj.chunk) |
1da177e4 | 1397 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1398 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1399 | |
96cd0d3d VY |
1400 | if (new_obj->transport) { |
1401 | new_obj->transport->init_sent_count++; | |
1402 | asoc->init_last_sent_to = new_obj->transport; | |
1403 | } | |
1404 | ||
1da177e4 | 1405 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1406 | * enabling COOKIE-ECHO + DATA bundling during |
1407 | * multihoming stale cookie scenarios, the following | |
1408 | * command plays with asoc->peer.retran_path to | |
1409 | * avoid the problem of sending the COOKIE-ECHO and | |
1410 | * DATA in different paths, which could result | |
1411 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1412 | * is processed first by the server. Checking the |
1413 | * init error counter simply causes this command | |
1414 | * to be executed only during failed attempts of | |
1415 | * association establishment. | |
1416 | */ | |
3f7a87d2 FF |
1417 | if ((asoc->peer.retran_path != |
1418 | asoc->peer.primary_path) && | |
1419 | (asoc->init_err_counter > 0)) { | |
1420 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1421 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1422 | SCTP_NULL()); |
1423 | } | |
1424 | ||
1425 | break; | |
1426 | ||
1427 | case SCTP_CMD_GEN_SHUTDOWN: | |
1428 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1429 | * Reset error counts. | |
1430 | */ | |
1431 | asoc->overall_error_count = 0; | |
1432 | ||
1433 | /* Generate a SHUTDOWN chunk. */ | |
1434 | new_obj = sctp_make_shutdown(asoc, chunk); | |
be7a7729 XL |
1435 | if (!new_obj) { |
1436 | error = -ENOMEM; | |
1437 | break; | |
1438 | } | |
1da177e4 LT |
1439 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1440 | SCTP_CHUNK(new_obj)); | |
1441 | break; | |
1442 | ||
1443 | case SCTP_CMD_CHUNK_ULP: | |
1444 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1445 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1446 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1447 | ||
bd4d627d XL |
1448 | asoc->stream.si->ulpevent_data(&asoc->ulpq, |
1449 | cmd->obj.chunk, | |
1450 | GFP_ATOMIC); | |
1da177e4 LT |
1451 | break; |
1452 | ||
1453 | case SCTP_CMD_EVENT_ULP: | |
1454 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1455 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1456 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1457 | ||
9162e0ed XL |
1458 | asoc->stream.si->enqueue_event(&asoc->ulpq, |
1459 | cmd->obj.ulpevent); | |
1da177e4 LT |
1460 | break; |
1461 | ||
1462 | case SCTP_CMD_REPLY: | |
1463 | /* If an caller has not already corked, do cork. */ | |
1464 | if (!asoc->outqueue.cork) { | |
1465 | sctp_outq_cork(&asoc->outqueue); | |
1466 | local_cork = 1; | |
1467 | } | |
1468 | /* Send a chunk to our peer. */ | |
83dbc3d4 | 1469 | sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp); |
1da177e4 LT |
1470 | break; |
1471 | ||
1472 | case SCTP_CMD_SEND_PKT: | |
1473 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1474 | packet = cmd->obj.packet; |
cea8768f | 1475 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1476 | sctp_ootb_pkt_free(packet); |
1477 | break; | |
1478 | ||
b6157d8e VY |
1479 | case SCTP_CMD_T1_RETRAN: |
1480 | /* Mark a transport for retransmission. */ | |
1481 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1482 | SCTP_RTXR_T1_RTX); | |
1483 | break; | |
1484 | ||
1da177e4 LT |
1485 | case SCTP_CMD_RETRAN: |
1486 | /* Mark a transport for retransmission. */ | |
1487 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1488 | SCTP_RTXR_T3_RTX); | |
1489 | break; | |
1490 | ||
1da177e4 LT |
1491 | case SCTP_CMD_ECN_CE: |
1492 | /* Do delayed CE processing. */ | |
1493 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1494 | break; | |
1495 | ||
1496 | case SCTP_CMD_ECN_ECNE: | |
1497 | /* Do delayed ECNE processing. */ | |
1498 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1499 | chunk); | |
1500 | if (new_obj) | |
1501 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1502 | SCTP_CHUNK(new_obj)); | |
1503 | break; | |
1504 | ||
1505 | case SCTP_CMD_ECN_CWR: | |
1506 | /* Do delayed CWR processing. */ | |
1507 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1508 | break; | |
1509 | ||
1510 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1511 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1512 | break; |
1513 | ||
f8d96052 TG |
1514 | case SCTP_CMD_TIMER_START_ONCE: |
1515 | timer = &asoc->timers[cmd->obj.to]; | |
1516 | ||
1517 | if (timer_pending(timer)) | |
1518 | break; | |
df561f66 | 1519 | fallthrough; |
f8d96052 | 1520 | |
1da177e4 LT |
1521 | case SCTP_CMD_TIMER_START: |
1522 | timer = &asoc->timers[cmd->obj.to]; | |
1523 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1524 | BUG_ON(!timeout); |
1da177e4 | 1525 | |
20a785aa NH |
1526 | /* |
1527 | * SCTP has a hard time with timer starts. Because we process | |
1528 | * timer starts as side effects, it can be hard to tell if we | |
1529 | * have already started a timer or not, which leads to BUG | |
1530 | * halts when we call add_timer. So here, instead of just starting | |
1531 | * a timer, if the timer is already started, and just mod | |
1532 | * the timer with the shorter of the two expiration times | |
1533 | */ | |
1534 | if (!timer_pending(timer)) | |
1535 | sctp_association_hold(asoc); | |
1536 | timer_reduce(timer, jiffies + timeout); | |
1da177e4 LT |
1537 | break; |
1538 | ||
1539 | case SCTP_CMD_TIMER_RESTART: | |
1540 | timer = &asoc->timers[cmd->obj.to]; | |
1541 | timeout = asoc->timeouts[cmd->obj.to]; | |
1542 | if (!mod_timer(timer, jiffies + timeout)) | |
1543 | sctp_association_hold(asoc); | |
1544 | break; | |
1545 | ||
1546 | case SCTP_CMD_TIMER_STOP: | |
1547 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1548 | if (del_timer(timer)) |
1da177e4 LT |
1549 | sctp_association_put(asoc); |
1550 | break; | |
1551 | ||
3f7a87d2 | 1552 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1553 | chunk = cmd->obj.chunk; |
9919b455 WY |
1554 | t = sctp_assoc_choose_alter_transport(asoc, |
1555 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1556 | asoc->init_last_sent_to = t; |
1557 | chunk->transport = t; | |
1558 | t->init_sent_count++; | |
e0e9db17 VY |
1559 | /* Set the new transport as primary */ |
1560 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1561 | break; |
1562 | ||
1da177e4 LT |
1563 | case SCTP_CMD_INIT_RESTART: |
1564 | /* Do the needed accounting and updates | |
1565 | * associated with restarting an initialization | |
3f7a87d2 FF |
1566 | * timer. Only multiply the timeout by two if |
1567 | * all transports have been tried at the current | |
1568 | * timeout. | |
1569 | */ | |
96cd0d3d VY |
1570 | sctp_cmd_t1_timer_update(asoc, |
1571 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1572 | "INIT"); | |
3f7a87d2 FF |
1573 | |
1574 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1575 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1576 | break; | |
1577 | ||
1578 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1579 | /* Do the needed accounting and updates | |
1580 | * associated with restarting an initialization | |
1581 | * timer. Only multiply the timeout by two if | |
1582 | * all transports have been tried at the current | |
1583 | * timeout. | |
1da177e4 | 1584 | */ |
96cd0d3d VY |
1585 | sctp_cmd_t1_timer_update(asoc, |
1586 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1587 | "COOKIE"); | |
1da177e4 LT |
1588 | |
1589 | /* If we've sent any data bundled with | |
1590 | * COOKIE-ECHO we need to resend. | |
1591 | */ | |
9dbc15f0 RD |
1592 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1593 | transports) { | |
b6157d8e VY |
1594 | sctp_retransmit_mark(&asoc->outqueue, t, |
1595 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1596 | } |
1597 | ||
1598 | sctp_add_cmd_sf(commands, | |
1599 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1600 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1601 | break; |
1602 | ||
1603 | case SCTP_CMD_INIT_FAILED: | |
978aa047 | 1604 | sctp_cmd_init_failed(commands, asoc, cmd->obj.u32); |
1da177e4 LT |
1605 | break; |
1606 | ||
1607 | case SCTP_CMD_ASSOC_FAILED: | |
1608 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
978aa047 | 1609 | subtype, chunk, cmd->obj.u32); |
1da177e4 LT |
1610 | break; |
1611 | ||
3f7a87d2 FF |
1612 | case SCTP_CMD_INIT_COUNTER_INC: |
1613 | asoc->init_err_counter++; | |
1da177e4 LT |
1614 | break; |
1615 | ||
3f7a87d2 FF |
1616 | case SCTP_CMD_INIT_COUNTER_RESET: |
1617 | asoc->init_err_counter = 0; | |
1618 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1619 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1620 | transports) { | |
1621 | t->init_sent_count = 0; | |
1622 | } | |
1da177e4 LT |
1623 | break; |
1624 | ||
1625 | case SCTP_CMD_REPORT_DUP: | |
1626 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1627 | cmd->obj.u32); | |
1628 | break; | |
1629 | ||
1630 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1631 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1632 | break; |
1633 | ||
1634 | case SCTP_CMD_STRIKE: | |
1635 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1636 | sctp_do_8_2_transport_strike(commands, asoc, |
1637 | cmd->obj.transport, 0); | |
7e99013a VY |
1638 | break; |
1639 | ||
1640 | case SCTP_CMD_TRANSPORT_IDLE: | |
1641 | t = cmd->obj.transport; | |
1642 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1643 | break; |
1644 | ||
7e99013a | 1645 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1646 | t = cmd->obj.transport; |
5aa93bcf NH |
1647 | sctp_do_8_2_transport_strike(commands, asoc, |
1648 | t, 1); | |
7e99013a | 1649 | t->hb_sent = 1; |
1da177e4 LT |
1650 | break; |
1651 | ||
1652 | case SCTP_CMD_TRANSPORT_ON: | |
1653 | t = cmd->obj.transport; | |
1654 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1655 | break; | |
1656 | ||
1657 | case SCTP_CMD_HB_TIMERS_START: | |
1658 | sctp_cmd_hb_timers_start(commands, asoc); | |
1659 | break; | |
1660 | ||
1661 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1662 | t = cmd->obj.transport; | |
ba6f5e33 | 1663 | sctp_transport_reset_hb_timer(t); |
1da177e4 LT |
1664 | break; |
1665 | ||
1666 | case SCTP_CMD_HB_TIMERS_STOP: | |
1667 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1668 | break; | |
1669 | ||
1670 | case SCTP_CMD_REPORT_ERROR: | |
1671 | error = cmd->obj.error; | |
1672 | break; | |
1673 | ||
1674 | case SCTP_CMD_PROCESS_CTSN: | |
1675 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1676 | sackh.cum_tsn_ack = cmd->obj.be32; |
f6fc6bc0 XL |
1677 | sackh.a_rwnd = htonl(asoc->peer.rwnd + |
1678 | asoc->outqueue.outstanding_bytes); | |
1da177e4 LT |
1679 | sackh.num_gap_ack_blocks = 0; |
1680 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1681 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1682 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1683 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1684 | break; |
1685 | ||
1686 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1687 | /* We need to discard the whole packet. |
1688 | * Uncork the queue since there might be | |
1689 | * responses pending | |
1690 | */ | |
1da177e4 | 1691 | chunk->pdiscard = 1; |
2e3216cd | 1692 | if (asoc) { |
cea8768f | 1693 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1694 | local_cork = 0; |
1695 | } | |
1da177e4 LT |
1696 | break; |
1697 | ||
1698 | case SCTP_CMD_RTO_PENDING: | |
1699 | t = cmd->obj.transport; | |
1700 | t->rto_pending = 1; | |
1701 | break; | |
1702 | ||
1703 | case SCTP_CMD_PART_DELIVER: | |
be4e0ce1 | 1704 | asoc->stream.si->start_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1705 | break; |
1706 | ||
1707 | case SCTP_CMD_RENEGE: | |
94014e8d XL |
1708 | asoc->stream.si->renege_events(&asoc->ulpq, |
1709 | cmd->obj.chunk, | |
1710 | GFP_ATOMIC); | |
1da177e4 LT |
1711 | break; |
1712 | ||
1713 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1714 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1715 | break; |
1716 | ||
1717 | case SCTP_CMD_PROCESS_OPERR: | |
1718 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1719 | break; | |
1720 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1721 | asoc->peer.i.init_tag = 0; | |
1722 | break; | |
1723 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1724 | sctp_cmd_del_non_primary(asoc); | |
1725 | break; | |
1726 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1727 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1728 | break; | |
1729 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1730 | t = asoc->peer.retran_path; | |
1731 | asoc->peer.retran_path = asoc->peer.primary_path; | |
83dbc3d4 | 1732 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1733 | local_cork = 0; |
1734 | asoc->peer.retran_path = t; | |
1735 | break; | |
8de8c873 SS |
1736 | case SCTP_CMD_SET_SK_ERR: |
1737 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1738 | break; | |
07d93967 VY |
1739 | case SCTP_CMD_ASSOC_CHANGE: |
1740 | sctp_cmd_assoc_change(commands, asoc, | |
1741 | cmd->obj.u8); | |
1742 | break; | |
1743 | case SCTP_CMD_ADAPTATION_IND: | |
1744 | sctp_cmd_adaptation_ind(commands, asoc); | |
1745 | break; | |
30f6ebf6 XL |
1746 | case SCTP_CMD_PEER_NO_AUTH: |
1747 | sctp_cmd_peer_no_auth(commands, asoc); | |
1748 | break; | |
07d93967 | 1749 | |
730fc3d0 VY |
1750 | case SCTP_CMD_ASSOC_SHKEY: |
1751 | error = sctp_auth_asoc_init_active_key(asoc, | |
1752 | GFP_ATOMIC); | |
1753 | break; | |
f4ad85ca GJ |
1754 | case SCTP_CMD_UPDATE_INITTAG: |
1755 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1756 | break; | |
9c5c62be VY |
1757 | case SCTP_CMD_SEND_MSG: |
1758 | if (!asoc->outqueue.cork) { | |
1759 | sctp_outq_cork(&asoc->outqueue); | |
1760 | local_cork = 1; | |
1761 | } | |
66388f2c | 1762 | sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1763 | break; |
a000c01e WY |
1764 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1765 | sctp_asconf_queue_teardown(asoc); | |
1766 | break; | |
d5ccd496 MM |
1767 | |
1768 | case SCTP_CMD_SET_ASOC: | |
8cd5c25f XL |
1769 | if (asoc && local_cork) { |
1770 | sctp_outq_uncork(&asoc->outqueue, gfp); | |
1771 | local_cork = 0; | |
1772 | } | |
d5ccd496 MM |
1773 | asoc = cmd->obj.asoc; |
1774 | break; | |
1775 | ||
1da177e4 | 1776 | default: |
b26ddd81 NH |
1777 | pr_warn("Impossible command: %u\n", |
1778 | cmd->verb); | |
1da177e4 | 1779 | break; |
3ff50b79 SH |
1780 | } |
1781 | ||
be7a7729 XL |
1782 | if (error) { |
1783 | cmd = sctp_next_cmd(commands); | |
1784 | while (cmd) { | |
1785 | if (cmd->verb == SCTP_CMD_REPLY) | |
1786 | sctp_chunk_free(cmd->obj.chunk); | |
1787 | cmd = sctp_next_cmd(commands); | |
1788 | } | |
1da177e4 | 1789 | break; |
be7a7729 | 1790 | } |
1da177e4 LT |
1791 | } |
1792 | ||
2e3216cd VY |
1793 | /* If this is in response to a received chunk, wait until |
1794 | * we are done with the packet to open the queue so that we don't | |
1795 | * send multiple packets in response to a single request. | |
1796 | */ | |
1797 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1798 | if (chunk->end_of_packet || chunk->singleton) | |
83dbc3d4 | 1799 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1800 | } else if (local_cork) |
83dbc3d4 | 1801 | sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 | 1802 | |
0970f5b3 MRL |
1803 | if (sp->data_ready_signalled) |
1804 | sp->data_ready_signalled = 0; | |
1805 | ||
1da177e4 | 1806 | return error; |
1da177e4 | 1807 | } |