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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
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 the state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * C. Robin <chris@hundredacre.ac.uk> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Xingang Guo <xingang.guo@intel.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Sridhar Samudrala <sri@us.ibm.com> | |
41 | * Daisy Chang <daisyc@us.ibm.com> | |
42 | * Ardelle Fan <ardelle.fan@intel.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
5821c769 | 48 | #include <crypto/hash.h> |
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/kernel.h> | |
51 | #include <linux/ip.h> | |
52 | #include <linux/ipv6.h> | |
53 | #include <linux/net.h> | |
54 | #include <linux/inet.h> | |
ebc3bbcf | 55 | #include <linux/scatterlist.h> |
5a0e3ad6 | 56 | #include <linux/slab.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | #include <linux/random.h> /* for get_random_bytes */ | |
61 | #include <net/sctp/sctp.h> | |
62 | #include <net/sctp/sm.h> | |
63 | ||
072017b4 | 64 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
65 | __u8 type, __u8 flags, int paylen, |
66 | gfp_t gfp); | |
072017b4 | 67 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 68 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 69 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
70 | __u8 type, __u8 flags, int paylen, |
71 | gfp_t gfp); | |
1da177e4 LT |
72 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
73 | const struct sctp_association *asoc, | |
74 | const struct sctp_chunk *init_chunk, | |
75 | int *cookie_len, | |
76 | const __u8 *raw_addrs, int addrs_len); | |
77 | static int sctp_process_param(struct sctp_association *asoc, | |
78 | union sctp_params param, | |
79 | const union sctp_addr *peer_addr, | |
dd0fc66f | 80 | gfp_t gfp); |
8ee4be37 VY |
81 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
82 | const void *data); | |
6daaf0de | 83 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, |
84 | const void *data); | |
1da177e4 | 85 | |
072017b4 VY |
86 | /* Control chunk destructor */ |
87 | static void sctp_control_release_owner(struct sk_buff *skb) | |
88 | { | |
89 | /*TODO: do memory release */ | |
90 | } | |
91 | ||
92 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
93 | { | |
94 | struct sctp_association *asoc = chunk->asoc; | |
95 | struct sk_buff *skb = chunk->skb; | |
96 | ||
97 | /* TODO: properly account for control chunks. | |
98 | * To do it right we'll need: | |
99 | * 1) endpoint if association isn't known. | |
100 | * 2) proper memory accounting. | |
101 | * | |
102 | * For now don't do anything for now. | |
103 | */ | |
104 | skb->sk = asoc ? asoc->base.sk : NULL; | |
105 | skb->destructor = sctp_control_release_owner; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* What was the inbound interface for this chunk? */ |
109 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
110 | { | |
e7487c86 | 111 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 112 | |
e7487c86 | 113 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
114 | } |
115 | ||
116 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
117 | * | |
118 | * Note 2: The ECN capable field is reserved for future use of | |
119 | * Explicit Congestion Notification. | |
120 | */ | |
121 | static const struct sctp_paramhdr ecap_param = { | |
122 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 123 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
124 | }; |
125 | static const struct sctp_paramhdr prsctp_param = { | |
126 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 127 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
128 | }; |
129 | ||
5fa782c2 | 130 | /* A helper to initialize an op error inside a |
1da177e4 LT |
131 | * provided chunk, as most cause codes will be embedded inside an |
132 | * abort chunk. | |
133 | */ | |
5bf2db03 | 134 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
00f1c2df | 135 | size_t paylen) |
1da177e4 LT |
136 | { |
137 | sctp_errhdr_t err; | |
1da177e4 LT |
138 | __u16 len; |
139 | ||
d808ad9a | 140 | /* Cause code constants are now defined in network order. */ |
1da177e4 LT |
141 | err.cause = cause_code; |
142 | len = sizeof(sctp_errhdr_t) + paylen; | |
1da177e4 | 143 | err.length = htons(len); |
4a1c0107 | 144 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); |
1da177e4 LT |
145 | } |
146 | ||
5fa782c2 NH |
147 | /* A helper to initialize an op error inside a |
148 | * provided chunk, as most cause codes will be embedded inside an | |
149 | * abort chunk. Differs from sctp_init_cause in that it won't oops | |
150 | * if there isn't enough space in the op error chunk | |
151 | */ | |
db28aafa | 152 | static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, |
5fa782c2 NH |
153 | size_t paylen) |
154 | { | |
155 | sctp_errhdr_t err; | |
156 | __u16 len; | |
157 | ||
158 | /* Cause code constants are now defined in network order. */ | |
159 | err.cause = cause_code; | |
160 | len = sizeof(sctp_errhdr_t) + paylen; | |
161 | err.length = htons(len); | |
162 | ||
2e3219b5 | 163 | if (skb_tailroom(chunk->skb) < len) |
5fa782c2 NH |
164 | return -ENOSPC; |
165 | chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, | |
166 | sizeof(sctp_errhdr_t), | |
167 | &err); | |
168 | return 0; | |
169 | } | |
1da177e4 LT |
170 | /* 3.3.2 Initiation (INIT) (1) |
171 | * | |
172 | * This chunk is used to initiate a SCTP association between two | |
173 | * endpoints. The format of the INIT chunk is shown below: | |
174 | * | |
175 | * 0 1 2 3 | |
176 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
177 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
178 | * | Type = 1 | Chunk Flags | Chunk Length | | |
179 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
180 | * | Initiate Tag | | |
181 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
182 | * | Advertised Receiver Window Credit (a_rwnd) | | |
183 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
184 | * | Number of Outbound Streams | Number of Inbound Streams | | |
185 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
186 | * | Initial TSN | | |
187 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
188 | * \ \ | |
189 | * / Optional/Variable-Length Parameters / | |
190 | * \ \ | |
191 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
192 | * | |
193 | * | |
194 | * The INIT chunk contains the following parameters. Unless otherwise | |
195 | * noted, each parameter MUST only be included once in the INIT chunk. | |
196 | * | |
197 | * Fixed Parameters Status | |
198 | * ---------------------------------------------- | |
199 | * Initiate Tag Mandatory | |
200 | * Advertised Receiver Window Credit Mandatory | |
201 | * Number of Outbound Streams Mandatory | |
202 | * Number of Inbound Streams Mandatory | |
203 | * Initial TSN Mandatory | |
204 | * | |
205 | * Variable Parameters Status Type Value | |
206 | * ------------------------------------------------------------- | |
207 | * IPv4 Address (Note 1) Optional 5 | |
208 | * IPv6 Address (Note 1) Optional 6 | |
209 | * Cookie Preservative Optional 9 | |
210 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
211 | * Host Name Address (Note 3) Optional 11 | |
212 | * Supported Address Types (Note 4) Optional 12 | |
213 | */ | |
214 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
215 | const struct sctp_bind_addr *bp, | |
dd0fc66f | 216 | gfp_t gfp, int vparam_len) |
1da177e4 | 217 | { |
e1fc3b14 | 218 | struct net *net = sock_net(asoc->base.sk); |
b14878cc | 219 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
220 | sctp_inithdr_t init; |
221 | union sctp_params addrs; | |
222 | size_t chunksize; | |
223 | struct sctp_chunk *retval = NULL; | |
224 | int num_types, addrs_len = 0; | |
225 | struct sctp_sock *sp; | |
226 | sctp_supported_addrs_param_t sat; | |
3dbe8656 | 227 | __be16 types[2]; |
0f3fffd8 | 228 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
229 | sctp_supported_ext_param_t ext_param; |
230 | int num_ext = 0; | |
231 | __u8 extensions[3]; | |
730fc3d0 VY |
232 | sctp_paramhdr_t *auth_chunks = NULL, |
233 | *auth_hmacs = NULL; | |
1da177e4 LT |
234 | |
235 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
236 | * | |
237 | * Note 1: The INIT chunks can contain multiple addresses that | |
238 | * can be IPv4 and/or IPv6 in any combination. | |
239 | */ | |
240 | retval = NULL; | |
241 | ||
242 | /* Convert the provided bind address list to raw format. */ | |
243 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
244 | ||
245 | init.init_tag = htonl(asoc->c.my_vtag); | |
246 | init.a_rwnd = htonl(asoc->rwnd); | |
247 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
248 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
249 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
250 | ||
251 | /* How many address types are needed? */ | |
252 | sp = sctp_sk(asoc->base.sk); | |
253 | num_types = sp->pf->supported_addrs(sp, types); | |
254 | ||
a8170c35 | 255 | chunksize = sizeof(init) + addrs_len; |
e2f036a9 | 256 | chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); |
1da177e4 | 257 | chunksize += sizeof(ecap_param); |
8ee4be37 | 258 | |
28aa4c26 | 259 | if (asoc->prsctp_enable) |
036b579b VY |
260 | chunksize += sizeof(prsctp_param); |
261 | ||
131a47e3 VY |
262 | /* ADDIP: Section 4.2.7: |
263 | * An implementation supporting this extension [ADDIP] MUST list | |
264 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
265 | * INIT-ACK parameters. | |
131a47e3 | 266 | */ |
e1fc3b14 | 267 | if (net->sctp.addip_enable) { |
131a47e3 VY |
268 | extensions[num_ext] = SCTP_CID_ASCONF; |
269 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
270 | num_ext += 2; | |
271 | } | |
272 | ||
c28445c3 XL |
273 | if (asoc->reconf_enable) { |
274 | extensions[num_ext] = SCTP_CID_RECONF; | |
275 | num_ext += 1; | |
276 | } | |
277 | ||
6fc791ee | 278 | if (sp->adaptation_ind) |
279 | chunksize += sizeof(aiparam); | |
280 | ||
1da177e4 LT |
281 | chunksize += vparam_len; |
282 | ||
730fc3d0 | 283 | /* Account for AUTH related parameters */ |
b14878cc | 284 | if (ep->auth_enable) { |
730fc3d0 VY |
285 | /* Add random parameter length*/ |
286 | chunksize += sizeof(asoc->c.auth_random); | |
287 | ||
288 | /* Add HMACS parameter length if any were defined */ | |
289 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
290 | if (auth_hmacs->length) | |
e2f036a9 | 291 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
292 | else |
293 | auth_hmacs = NULL; | |
294 | ||
295 | /* Add CHUNKS parameter length */ | |
296 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
297 | if (auth_chunks->length) | |
e2f036a9 | 298 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 | 299 | else |
9baffaa6 | 300 | auth_chunks = NULL; |
730fc3d0 VY |
301 | |
302 | extensions[num_ext] = SCTP_CID_AUTH; | |
303 | num_ext += 1; | |
304 | } | |
305 | ||
131a47e3 VY |
306 | /* If we have any extensions to report, account for that */ |
307 | if (num_ext) | |
e2f036a9 MRL |
308 | chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) + |
309 | num_ext); | |
131a47e3 | 310 | |
1da177e4 LT |
311 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
312 | * | |
313 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
314 | * Name address parameter. Moreover, the sender of the INIT | |
315 | * MUST NOT combine any other address types with the Host Name | |
316 | * address in the INIT. The receiver of INIT MUST ignore any | |
317 | * other address types if the Host Name address parameter is | |
318 | * present in the received INIT chunk. | |
319 | * | |
320 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
321 | */ | |
322 | ||
cea8768f | 323 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); |
1da177e4 LT |
324 | if (!retval) |
325 | goto nodata; | |
326 | ||
327 | retval->subh.init_hdr = | |
328 | sctp_addto_chunk(retval, sizeof(init), &init); | |
329 | retval->param_hdr.v = | |
330 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
331 | ||
332 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
333 | * | |
334 | * Note 4: This parameter, when present, specifies all the | |
335 | * address types the sending endpoint can support. The absence | |
336 | * of this parameter indicates that the sending endpoint can | |
337 | * support any address type. | |
338 | */ | |
339 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
340 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
341 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
342 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
343 | ||
344 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 345 | |
7aa1b54b | 346 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
347 | * fist before addiding the parameters for the extensions themselves |
348 | */ | |
349 | if (num_ext) { | |
350 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
351 | ext_param.param_hdr.length = | |
352 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
353 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
354 | &ext_param); | |
8ee4be37 | 355 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
356 | } |
357 | ||
28aa4c26 | 358 | if (asoc->prsctp_enable) |
1da177e4 | 359 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 360 | |
6fc791ee | 361 | if (sp->adaptation_ind) { |
362 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
363 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
364 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
365 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
366 | } | |
131a47e3 | 367 | |
730fc3d0 | 368 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 369 | if (ep->auth_enable) { |
730fc3d0 VY |
370 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
371 | asoc->c.auth_random); | |
372 | if (auth_hmacs) | |
373 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
374 | auth_hmacs); | |
375 | if (auth_chunks) | |
376 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
377 | auth_chunks); | |
378 | } | |
1da177e4 | 379 | nodata: |
a51482bd | 380 | kfree(addrs.v); |
1da177e4 LT |
381 | return retval; |
382 | } | |
383 | ||
384 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
385 | const struct sctp_chunk *chunk, | |
dd0fc66f | 386 | gfp_t gfp, int unkparam_len) |
1da177e4 LT |
387 | { |
388 | sctp_inithdr_t initack; | |
389 | struct sctp_chunk *retval; | |
390 | union sctp_params addrs; | |
6fc791ee | 391 | struct sctp_sock *sp; |
1da177e4 LT |
392 | int addrs_len; |
393 | sctp_cookie_param_t *cookie; | |
394 | int cookie_len; | |
395 | size_t chunksize; | |
0f3fffd8 | 396 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
397 | sctp_supported_ext_param_t ext_param; |
398 | int num_ext = 0; | |
399 | __u8 extensions[3]; | |
730fc3d0 VY |
400 | sctp_paramhdr_t *auth_chunks = NULL, |
401 | *auth_hmacs = NULL, | |
402 | *auth_random = NULL; | |
1da177e4 LT |
403 | |
404 | retval = NULL; | |
405 | ||
406 | /* Note: there may be no addresses to embed. */ | |
407 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
408 | ||
409 | initack.init_tag = htonl(asoc->c.my_vtag); | |
410 | initack.a_rwnd = htonl(asoc->rwnd); | |
411 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
412 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
413 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
414 | ||
415 | /* FIXME: We really ought to build the cookie right | |
416 | * into the packet instead of allocating more fresh memory. | |
417 | */ | |
418 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
419 | addrs.v, addrs_len); | |
420 | if (!cookie) | |
421 | goto nomem_cookie; | |
422 | ||
423 | /* Calculate the total size of allocation, include the reserved | |
424 | * space for reporting unknown parameters if it is specified. | |
425 | */ | |
6fc791ee | 426 | sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
427 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
428 | ||
d808ad9a | 429 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
430 | if (asoc->peer.ecn_capable) |
431 | chunksize += sizeof(ecap_param); | |
432 | ||
5ffad5ac | 433 | if (asoc->peer.prsctp_capable) |
036b579b VY |
434 | chunksize += sizeof(prsctp_param); |
435 | ||
5ffad5ac | 436 | if (asoc->peer.asconf_capable) { |
131a47e3 VY |
437 | extensions[num_ext] = SCTP_CID_ASCONF; |
438 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
439 | num_ext += 2; | |
440 | } | |
441 | ||
c28445c3 XL |
442 | if (asoc->peer.reconf_capable) { |
443 | extensions[num_ext] = SCTP_CID_RECONF; | |
444 | num_ext += 1; | |
445 | } | |
446 | ||
6fc791ee | 447 | if (sp->adaptation_ind) |
448 | chunksize += sizeof(aiparam); | |
1da177e4 | 449 | |
730fc3d0 VY |
450 | if (asoc->peer.auth_capable) { |
451 | auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; | |
452 | chunksize += ntohs(auth_random->length); | |
453 | ||
454 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
455 | if (auth_hmacs->length) | |
e2f036a9 | 456 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
457 | else |
458 | auth_hmacs = NULL; | |
459 | ||
460 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
461 | if (auth_chunks->length) | |
e2f036a9 | 462 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 VY |
463 | else |
464 | auth_chunks = NULL; | |
465 | ||
466 | extensions[num_ext] = SCTP_CID_AUTH; | |
467 | num_ext += 1; | |
468 | } | |
469 | ||
8ee4be37 | 470 | if (num_ext) |
e2f036a9 MRL |
471 | chunksize += SCTP_PAD4(sizeof(sctp_supported_ext_param_t) + |
472 | num_ext); | |
8ee4be37 | 473 | |
1da177e4 | 474 | /* Now allocate and fill out the chunk. */ |
cea8768f | 475 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
476 | if (!retval) |
477 | goto nomem_chunk; | |
478 | ||
b99a4d53 DC |
479 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
480 | * | |
481 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
482 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
483 | * address from which it received the DATA or control chunk | |
484 | * to which it is replying. | |
485 | * | |
486 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 LT |
487 | */ |
488 | retval->transport = chunk->transport; | |
b99a4d53 | 489 | |
1da177e4 LT |
490 | retval->subh.init_hdr = |
491 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
492 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
493 | sctp_addto_chunk(retval, cookie_len, cookie); | |
494 | if (asoc->peer.ecn_capable) | |
495 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
496 | if (num_ext) { |
497 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
498 | ext_param.param_hdr.length = | |
499 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
500 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
501 | &ext_param); | |
8ee4be37 | 502 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 503 | } |
1da177e4 LT |
504 | if (asoc->peer.prsctp_capable) |
505 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
506 | ||
6fc791ee | 507 | if (sp->adaptation_ind) { |
508 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
509 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
510 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
511 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
512 | } | |
1da177e4 | 513 | |
730fc3d0 VY |
514 | if (asoc->peer.auth_capable) { |
515 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
516 | auth_random); | |
517 | if (auth_hmacs) | |
518 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
519 | auth_hmacs); | |
520 | if (auth_chunks) | |
521 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
522 | auth_chunks); | |
523 | } | |
524 | ||
1da177e4 LT |
525 | /* We need to remove the const qualifier at this point. */ |
526 | retval->asoc = (struct sctp_association *) asoc; | |
527 | ||
1da177e4 LT |
528 | nomem_chunk: |
529 | kfree(cookie); | |
530 | nomem_cookie: | |
a51482bd | 531 | kfree(addrs.v); |
1da177e4 LT |
532 | return retval; |
533 | } | |
534 | ||
535 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
536 | * | |
537 | * This chunk is used only during the initialization of an association. | |
538 | * It is sent by the initiator of an association to its peer to complete | |
539 | * the initialization process. This chunk MUST precede any DATA chunk | |
540 | * sent within the association, but MAY be bundled with one or more DATA | |
541 | * chunks in the same packet. | |
542 | * | |
543 | * 0 1 2 3 | |
544 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
545 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
546 | * | Type = 10 |Chunk Flags | Length | | |
547 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
548 | * / Cookie / | |
549 | * \ \ | |
550 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
551 | * | |
552 | * Chunk Flags: 8 bit | |
553 | * | |
554 | * Set to zero on transmit and ignored on receipt. | |
555 | * | |
556 | * Length: 16 bits (unsigned integer) | |
557 | * | |
558 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
559 | * the chunk header and the size of the Cookie. | |
560 | * | |
561 | * Cookie: variable size | |
562 | * | |
563 | * This field must contain the exact cookie received in the | |
564 | * State Cookie parameter from the previous INIT ACK. | |
565 | * | |
566 | * An implementation SHOULD make the cookie as small as possible | |
567 | * to insure interoperability. | |
568 | */ | |
569 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
570 | const struct sctp_chunk *chunk) | |
571 | { | |
572 | struct sctp_chunk *retval; | |
573 | void *cookie; | |
574 | int cookie_len; | |
575 | ||
576 | cookie = asoc->peer.cookie; | |
577 | cookie_len = asoc->peer.cookie_len; | |
578 | ||
579 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
580 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
581 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
582 | if (!retval) |
583 | goto nodata; | |
584 | retval->subh.cookie_hdr = | |
585 | sctp_addto_chunk(retval, cookie_len, cookie); | |
586 | ||
587 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
588 | * | |
589 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
590 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
591 | * address from which it * received the DATA or control chunk | |
592 | * to which it is replying. | |
593 | * | |
594 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
595 | */ | |
596 | if (chunk) | |
597 | retval->transport = chunk->transport; | |
598 | ||
599 | nodata: | |
600 | return retval; | |
601 | } | |
602 | ||
603 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
604 | * | |
605 | * This chunk is used only during the initialization of an | |
606 | * association. It is used to acknowledge the receipt of a COOKIE | |
607 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
608 | * within the association, but MAY be bundled with one or more DATA | |
609 | * chunks or SACK chunk in the same SCTP packet. | |
610 | * | |
611 | * 0 1 2 3 | |
612 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
614 | * | Type = 11 |Chunk Flags | Length = 4 | | |
615 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
616 | * | |
617 | * Chunk Flags: 8 bits | |
618 | * | |
619 | * Set to zero on transmit and ignored on receipt. | |
620 | */ | |
621 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
622 | const struct sctp_chunk *chunk) | |
623 | { | |
624 | struct sctp_chunk *retval; | |
625 | ||
cea8768f | 626 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
627 | |
628 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
629 | * | |
630 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
631 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
632 | * address from which it * received the DATA or control chunk | |
633 | * to which it is replying. | |
634 | * | |
635 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
636 | */ | |
637 | if (retval && chunk) | |
638 | retval->transport = chunk->transport; | |
639 | ||
640 | return retval; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Appendix A: Explicit Congestion Notification: | |
645 | * CWR: | |
646 | * | |
647 | * RFC 2481 details a specific bit for a sender to send in the header of | |
648 | * its next outbound TCP segment to indicate to its peer that it has | |
649 | * reduced its congestion window. This is termed the CWR bit. For | |
650 | * SCTP the same indication is made by including the CWR chunk. | |
651 | * This chunk contains one data element, i.e. the TSN number that | |
652 | * was sent in the ECNE chunk. This element represents the lowest | |
653 | * TSN number in the datagram that was originally marked with the | |
654 | * CE bit. | |
655 | * | |
656 | * 0 1 2 3 | |
657 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
658 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
659 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
660 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
661 | * | Lowest TSN Number | | |
662 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
663 | * | |
664 | * Note: The CWR is considered a Control chunk. | |
665 | */ | |
666 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
667 | const __u32 lowest_tsn, | |
668 | const struct sctp_chunk *chunk) | |
669 | { | |
670 | struct sctp_chunk *retval; | |
671 | sctp_cwrhdr_t cwr; | |
672 | ||
673 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 674 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
cea8768f | 675 | sizeof(sctp_cwrhdr_t), GFP_ATOMIC); |
1da177e4 LT |
676 | |
677 | if (!retval) | |
678 | goto nodata; | |
679 | ||
680 | retval->subh.ecn_cwr_hdr = | |
681 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
682 | ||
683 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
684 | * | |
685 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
686 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
687 | * address from which it * received the DATA or control chunk | |
688 | * to which it is replying. | |
689 | * | |
690 | * [Report a reduced congestion window back to where the ECNE | |
691 | * came from.] | |
692 | */ | |
693 | if (chunk) | |
694 | retval->transport = chunk->transport; | |
695 | ||
696 | nodata: | |
697 | return retval; | |
698 | } | |
699 | ||
700 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
701 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
702 | const __u32 lowest_tsn) | |
703 | { | |
704 | struct sctp_chunk *retval; | |
705 | sctp_ecnehdr_t ecne; | |
706 | ||
707 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 708 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
cea8768f | 709 | sizeof(sctp_ecnehdr_t), GFP_ATOMIC); |
1da177e4 LT |
710 | if (!retval) |
711 | goto nodata; | |
712 | retval->subh.ecne_hdr = | |
713 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
714 | ||
715 | nodata: | |
716 | return retval; | |
717 | } | |
718 | ||
719 | /* Make a DATA chunk for the given association from the provided | |
720 | * parameters. However, do not populate the data payload. | |
721 | */ | |
722 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, | |
723 | const struct sctp_sndrcvinfo *sinfo, | |
cea8768f MRL |
724 | int data_len, __u8 flags, __u16 ssn, |
725 | gfp_t gfp) | |
1da177e4 LT |
726 | { |
727 | struct sctp_chunk *retval; | |
728 | struct sctp_datahdr dp; | |
729 | int chunk_len; | |
730 | ||
731 | /* We assign the TSN as LATE as possible, not here when | |
732 | * creating the chunk. | |
733 | */ | |
734 | dp.tsn = 0; | |
735 | dp.stream = htons(sinfo->sinfo_stream); | |
736 | dp.ppid = sinfo->sinfo_ppid; | |
737 | ||
738 | /* Set the flags for an unordered send. */ | |
eaa5c54d | 739 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
1da177e4 LT |
740 | flags |= SCTP_DATA_UNORDERED; |
741 | dp.ssn = 0; | |
742 | } else | |
743 | dp.ssn = htons(ssn); | |
744 | ||
745 | chunk_len = sizeof(dp) + data_len; | |
cea8768f | 746 | retval = sctp_make_data(asoc, flags, chunk_len, gfp); |
1da177e4 LT |
747 | if (!retval) |
748 | goto nodata; | |
749 | ||
750 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
751 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
752 | ||
753 | nodata: | |
754 | return retval; | |
755 | } | |
756 | ||
757 | /* Create a selective ackowledgement (SACK) for the given | |
758 | * association. This reports on which TSN's we've seen to date, | |
759 | * including duplicates and gaps. | |
760 | */ | |
761 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) | |
762 | { | |
763 | struct sctp_chunk *retval; | |
764 | struct sctp_sackhdr sack; | |
765 | int len; | |
766 | __u32 ctsn; | |
767 | __u16 num_gabs, num_dup_tsns; | |
4244854d | 768 | struct sctp_association *aptr = (struct sctp_association *)asoc; |
1da177e4 | 769 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
02015180 | 770 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
4244854d | 771 | struct sctp_transport *trans; |
1da177e4 | 772 | |
02015180 | 773 | memset(gabs, 0, sizeof(gabs)); |
1da177e4 | 774 | ctsn = sctp_tsnmap_get_ctsn(map); |
bb33381d DB |
775 | |
776 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); | |
1da177e4 LT |
777 | |
778 | /* How much room is needed in the chunk? */ | |
02015180 | 779 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
1da177e4 LT |
780 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
781 | ||
782 | /* Initialize the SACK header. */ | |
783 | sack.cum_tsn_ack = htonl(ctsn); | |
784 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
785 | sack.num_gap_ack_blocks = htons(num_gabs); | |
786 | sack.num_dup_tsns = htons(num_dup_tsns); | |
787 | ||
788 | len = sizeof(sack) | |
789 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
790 | + sizeof(__u32) * num_dup_tsns; | |
791 | ||
792 | /* Create the chunk. */ | |
cea8768f | 793 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); |
1da177e4 LT |
794 | if (!retval) |
795 | goto nodata; | |
796 | ||
797 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
798 | * | |
799 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
800 | * HEARTBEAT ACK, etc.) to the same destination transport | |
801 | * address from which it received the DATA or control chunk to | |
802 | * which it is replying. This rule should also be followed if | |
803 | * the endpoint is bundling DATA chunks together with the | |
804 | * reply chunk. | |
805 | * | |
806 | * However, when acknowledging multiple DATA chunks received | |
807 | * in packets from different source addresses in a single | |
808 | * SACK, the SACK chunk may be transmitted to one of the | |
809 | * destination transport addresses from which the DATA or | |
810 | * control chunks being acknowledged were received. | |
811 | * | |
812 | * [BUG: We do not implement the following paragraph. | |
813 | * Perhaps we should remember the last transport we used for a | |
814 | * SACK and avoid that (if possible) if we have seen any | |
815 | * duplicates. --piggy] | |
816 | * | |
817 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
818 | * multi- homed endpoint it MAY be beneficial to vary the | |
819 | * destination address and not use the source address of the | |
820 | * DATA chunk. The reason being that receiving a duplicate | |
821 | * from a multi-homed endpoint might indicate that the return | |
822 | * path (as specified in the source address of the DATA chunk) | |
823 | * for the SACK is broken. | |
824 | * | |
825 | * [Send to the address from which we last received a DATA chunk.] | |
826 | */ | |
827 | retval->transport = asoc->peer.last_data_from; | |
828 | ||
829 | retval->subh.sack_hdr = | |
830 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
831 | ||
832 | /* Add the gap ack block information. */ | |
833 | if (num_gabs) | |
834 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
02015180 | 835 | gabs); |
1da177e4 LT |
836 | |
837 | /* Add the duplicate TSN information. */ | |
196d6759 MB |
838 | if (num_dup_tsns) { |
839 | aptr->stats.idupchunks += num_dup_tsns; | |
1da177e4 LT |
840 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
841 | sctp_tsnmap_get_dups(map)); | |
196d6759 | 842 | } |
4244854d NH |
843 | /* Once we have a sack generated, check to see what our sack |
844 | * generation is, if its 0, reset the transports to 0, and reset | |
845 | * the association generation to 1 | |
846 | * | |
847 | * The idea is that zero is never used as a valid generation for the | |
848 | * association so no transport will match after a wrap event like this, | |
849 | * Until the next sack | |
850 | */ | |
851 | if (++aptr->peer.sack_generation == 0) { | |
852 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
853 | transports) | |
854 | trans->sack_generation = 0; | |
855 | aptr->peer.sack_generation = 1; | |
856 | } | |
1da177e4 LT |
857 | nodata: |
858 | return retval; | |
859 | } | |
860 | ||
861 | /* Make a SHUTDOWN chunk. */ | |
862 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
863 | const struct sctp_chunk *chunk) | |
864 | { | |
865 | struct sctp_chunk *retval; | |
866 | sctp_shutdownhdr_t shut; | |
867 | __u32 ctsn; | |
868 | ||
869 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
870 | shut.cum_tsn_ack = htonl(ctsn); | |
871 | ||
072017b4 | 872 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
cea8768f | 873 | sizeof(sctp_shutdownhdr_t), GFP_ATOMIC); |
1da177e4 LT |
874 | if (!retval) |
875 | goto nodata; | |
876 | ||
877 | retval->subh.shutdown_hdr = | |
878 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
879 | ||
880 | if (chunk) | |
881 | retval->transport = chunk->transport; | |
882 | nodata: | |
883 | return retval; | |
884 | } | |
885 | ||
886 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
887 | const struct sctp_chunk *chunk) | |
888 | { | |
889 | struct sctp_chunk *retval; | |
890 | ||
cea8768f MRL |
891 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
892 | GFP_ATOMIC); | |
1da177e4 LT |
893 | |
894 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
895 | * | |
896 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
897 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
898 | * address from which it * received the DATA or control chunk | |
899 | * to which it is replying. | |
900 | * | |
901 | * [ACK back to where the SHUTDOWN came from.] | |
902 | */ | |
903 | if (retval && chunk) | |
904 | retval->transport = chunk->transport; | |
905 | ||
906 | return retval; | |
907 | } | |
908 | ||
909 | struct sctp_chunk *sctp_make_shutdown_complete( | |
910 | const struct sctp_association *asoc, | |
911 | const struct sctp_chunk *chunk) | |
912 | { | |
913 | struct sctp_chunk *retval; | |
914 | __u8 flags = 0; | |
915 | ||
047a2428 JF |
916 | /* Set the T-bit if we have no association (vtag will be |
917 | * reflected) | |
918 | */ | |
1da177e4 LT |
919 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
920 | ||
cea8768f MRL |
921 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
922 | 0, GFP_ATOMIC); | |
1da177e4 LT |
923 | |
924 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
925 | * | |
926 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
927 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
928 | * address from which it * received the DATA or control chunk | |
929 | * to which it is replying. | |
930 | * | |
931 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
932 | * came from.] | |
933 | */ | |
934 | if (retval && chunk) | |
935 | retval->transport = chunk->transport; | |
936 | ||
d808ad9a | 937 | return retval; |
1da177e4 LT |
938 | } |
939 | ||
940 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 941 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
942 | */ |
943 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
944 | const struct sctp_chunk *chunk, | |
945 | const size_t hint) | |
946 | { | |
947 | struct sctp_chunk *retval; | |
948 | __u8 flags = 0; | |
949 | ||
047a2428 JF |
950 | /* Set the T-bit if we have no association and 'chunk' is not |
951 | * an INIT (vtag will be reflected). | |
952 | */ | |
953 | if (!asoc) { | |
954 | if (chunk && chunk->chunk_hdr && | |
955 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
956 | flags = 0; | |
957 | else | |
958 | flags = SCTP_CHUNK_FLAG_T; | |
959 | } | |
1da177e4 | 960 | |
cea8768f MRL |
961 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
962 | GFP_ATOMIC); | |
1da177e4 LT |
963 | |
964 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
965 | * | |
966 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
967 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
968 | * address from which it * received the DATA or control chunk | |
969 | * to which it is replying. | |
970 | * | |
971 | * [ABORT back to where the offender came from.] | |
972 | */ | |
973 | if (retval && chunk) | |
974 | retval->transport = chunk->transport; | |
975 | ||
976 | return retval; | |
977 | } | |
978 | ||
979 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
980 | struct sctp_chunk *sctp_make_abort_no_data( | |
981 | const struct sctp_association *asoc, | |
982 | const struct sctp_chunk *chunk, __u32 tsn) | |
983 | { | |
984 | struct sctp_chunk *retval; | |
9f81bcd9 | 985 | __be32 payload; |
1da177e4 LT |
986 | |
987 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) | |
988 | + sizeof(tsn)); | |
989 | ||
990 | if (!retval) | |
991 | goto no_mem; | |
992 | ||
993 | /* Put the tsn back into network byte order. */ | |
994 | payload = htonl(tsn); | |
00f1c2df WY |
995 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
996 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
997 | |
998 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
999 | * | |
1000 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1001 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1002 | * address from which it * received the DATA or control chunk | |
1003 | * to which it is replying. | |
1004 | * | |
1005 | * [ABORT back to where the offender came from.] | |
1006 | */ | |
1007 | if (chunk) | |
1008 | retval->transport = chunk->transport; | |
1009 | ||
1010 | no_mem: | |
1011 | return retval; | |
1012 | } | |
1013 | ||
1014 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1015 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1016 | struct msghdr *msg, |
c164a9ba | 1017 | size_t paylen) |
1da177e4 LT |
1018 | { |
1019 | struct sctp_chunk *retval; | |
c164a9ba SS |
1020 | void *payload = NULL; |
1021 | int err; | |
1da177e4 | 1022 | |
c164a9ba | 1023 | retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); |
1da177e4 LT |
1024 | if (!retval) |
1025 | goto err_chunk; | |
1026 | ||
1027 | if (paylen) { | |
1028 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1029 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1030 | if (!payload) |
1031 | goto err_payload; | |
c164a9ba | 1032 | |
6ce8e9ce | 1033 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1034 | if (err < 0) |
1035 | goto err_copy; | |
1da177e4 LT |
1036 | } |
1037 | ||
00f1c2df WY |
1038 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1039 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1040 | |
1041 | if (paylen) | |
1042 | kfree(payload); | |
1043 | ||
1044 | return retval; | |
1045 | ||
1046 | err_copy: | |
1047 | kfree(payload); | |
1048 | err_payload: | |
1049 | sctp_chunk_free(retval); | |
1050 | retval = NULL; | |
1051 | err_chunk: | |
1052 | return retval; | |
1053 | } | |
1054 | ||
5c94bf86 AB |
1055 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1056 | * enough. | |
1057 | */ | |
1058 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1059 | const void *data) | |
1060 | { | |
1061 | void *target; | |
1062 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
1063 | ||
1064 | target = skb_put(chunk->skb, len); | |
1065 | ||
6383cfb3 VY |
1066 | if (data) |
1067 | memcpy(target, data, len); | |
1068 | else | |
1069 | memset(target, 0, len); | |
5c94bf86 AB |
1070 | |
1071 | /* Adjust the chunk length field. */ | |
1072 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1073 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1074 | ||
1075 | return target; | |
1076 | } | |
1077 | ||
d808ad9a | 1078 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 LT |
1079 | struct sctp_chunk *sctp_make_abort_violation( |
1080 | const struct sctp_association *asoc, | |
1081 | const struct sctp_chunk *chunk, | |
1082 | const __u8 *payload, | |
1083 | const size_t paylen) | |
1084 | { | |
1085 | struct sctp_chunk *retval; | |
1086 | struct sctp_paramhdr phdr; | |
1087 | ||
1088 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen | |
00f1c2df | 1089 | + sizeof(sctp_paramhdr_t)); |
1da177e4 LT |
1090 | if (!retval) |
1091 | goto end; | |
1092 | ||
00f1c2df WY |
1093 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen |
1094 | + sizeof(sctp_paramhdr_t)); | |
1da177e4 LT |
1095 | |
1096 | phdr.type = htons(chunk->chunk_hdr->type); | |
1097 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df WY |
1098 | sctp_addto_chunk(retval, paylen, payload); |
1099 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); | |
1da177e4 LT |
1100 | |
1101 | end: | |
1102 | return retval; | |
1103 | } | |
1104 | ||
ba016670 WY |
1105 | struct sctp_chunk *sctp_make_violation_paramlen( |
1106 | const struct sctp_association *asoc, | |
1107 | const struct sctp_chunk *chunk, | |
1108 | struct sctp_paramhdr *param) | |
1109 | { | |
1110 | struct sctp_chunk *retval; | |
1111 | static const char error[] = "The following parameter had invalid length:"; | |
1112 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + | |
1113 | sizeof(sctp_paramhdr_t); | |
1114 | ||
1115 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1116 | if (!retval) | |
1117 | goto nodata; | |
1118 | ||
1119 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
1120 | sizeof(error) + sizeof(sctp_paramhdr_t)); | |
1121 | sctp_addto_chunk(retval, sizeof(error), error); | |
1122 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); | |
1123 | ||
1124 | nodata: | |
1125 | return retval; | |
1126 | } | |
1127 | ||
de4594a5 NH |
1128 | struct sctp_chunk *sctp_make_violation_max_retrans( |
1129 | const struct sctp_association *asoc, | |
1130 | const struct sctp_chunk *chunk) | |
1131 | { | |
1132 | struct sctp_chunk *retval; | |
1133 | static const char error[] = "Association exceeded its max_retans count"; | |
1134 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); | |
1135 | ||
1136 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1137 | if (!retval) | |
1138 | goto nodata; | |
1139 | ||
1140 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1141 | sctp_addto_chunk(retval, sizeof(error), error); | |
1142 | ||
1143 | nodata: | |
1144 | return retval; | |
1145 | } | |
1146 | ||
1da177e4 LT |
1147 | /* Make a HEARTBEAT chunk. */ |
1148 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
92c73af5 | 1149 | const struct sctp_transport *transport) |
1da177e4 | 1150 | { |
92c73af5 WY |
1151 | struct sctp_chunk *retval; |
1152 | sctp_sender_hb_info_t hbinfo; | |
1153 | ||
cea8768f MRL |
1154 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1155 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1156 | |
1157 | if (!retval) | |
1158 | goto nodata; | |
1159 | ||
92c73af5 WY |
1160 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
1161 | hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); | |
1162 | hbinfo.daddr = transport->ipaddr; | |
1163 | hbinfo.sent_at = jiffies; | |
1164 | hbinfo.hb_nonce = transport->hb_nonce; | |
1165 | ||
1da177e4 LT |
1166 | /* Cast away the 'const', as this is just telling the chunk |
1167 | * what transport it belongs to. | |
1168 | */ | |
1169 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1170 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1171 | &hbinfo); | |
1da177e4 LT |
1172 | |
1173 | nodata: | |
1174 | return retval; | |
1175 | } | |
1176 | ||
1177 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
1178 | const struct sctp_chunk *chunk, | |
1179 | const void *payload, const size_t paylen) | |
1180 | { | |
1181 | struct sctp_chunk *retval; | |
1182 | ||
cea8768f MRL |
1183 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1184 | GFP_ATOMIC); | |
1da177e4 LT |
1185 | if (!retval) |
1186 | goto nodata; | |
1187 | ||
1188 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1189 | ||
1190 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1191 | * | |
1192 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1193 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1194 | * address from which it * received the DATA or control chunk | |
1195 | * to which it is replying. | |
1196 | * | |
1197 | * [HBACK back to where the HEARTBEAT came from.] | |
1198 | */ | |
1199 | if (chunk) | |
1200 | retval->transport = chunk->transport; | |
1201 | ||
1202 | nodata: | |
1203 | return retval; | |
1204 | } | |
1205 | ||
1206 | /* Create an Operation Error chunk with the specified space reserved. | |
1207 | * This routine can be used for containing multiple causes in the chunk. | |
1208 | */ | |
1209 | static struct sctp_chunk *sctp_make_op_error_space( | |
1210 | const struct sctp_association *asoc, | |
1211 | const struct sctp_chunk *chunk, | |
1212 | size_t size) | |
1213 | { | |
1214 | struct sctp_chunk *retval; | |
1215 | ||
072017b4 | 1216 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
cea8768f | 1217 | sizeof(sctp_errhdr_t) + size, GFP_ATOMIC); |
1da177e4 LT |
1218 | if (!retval) |
1219 | goto nodata; | |
1220 | ||
1221 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1222 | * | |
1223 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1224 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1225 | * address from which it received the DATA or control chunk | |
1226 | * to which it is replying. | |
1227 | * | |
1228 | */ | |
1229 | if (chunk) | |
1230 | retval->transport = chunk->transport; | |
1231 | ||
1232 | nodata: | |
1233 | return retval; | |
1234 | } | |
1235 | ||
5fa782c2 NH |
1236 | /* Create an Operation Error chunk of a fixed size, |
1237 | * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) | |
1238 | * This is a helper function to allocate an error chunk for | |
1239 | * for those invalid parameter codes in which we may not want | |
d82603c6 | 1240 | * to report all the errors, if the incoming chunk is large |
5fa782c2 NH |
1241 | */ |
1242 | static inline struct sctp_chunk *sctp_make_op_error_fixed( | |
1243 | const struct sctp_association *asoc, | |
1244 | const struct sctp_chunk *chunk) | |
1245 | { | |
1246 | size_t size = asoc ? asoc->pathmtu : 0; | |
1247 | ||
1248 | if (!size) | |
1249 | size = SCTP_DEFAULT_MAXSEGMENT; | |
1250 | ||
1251 | return sctp_make_op_error_space(asoc, chunk, size); | |
1252 | } | |
1253 | ||
1da177e4 LT |
1254 | /* Create an Operation Error chunk. */ |
1255 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
1256 | const struct sctp_chunk *chunk, | |
63706c5c | 1257 | __be16 cause_code, const void *payload, |
6383cfb3 | 1258 | size_t paylen, size_t reserve_tail) |
1da177e4 LT |
1259 | { |
1260 | struct sctp_chunk *retval; | |
1261 | ||
6383cfb3 | 1262 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1263 | if (!retval) |
1264 | goto nodata; | |
1265 | ||
6383cfb3 | 1266 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1267 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1268 | if (reserve_tail) |
1269 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1270 | |
1271 | nodata: | |
1272 | return retval; | |
1273 | } | |
1274 | ||
4cd57c80 VY |
1275 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) |
1276 | { | |
1277 | struct sctp_chunk *retval; | |
1278 | struct sctp_hmac *hmac_desc; | |
1279 | struct sctp_authhdr auth_hdr; | |
1280 | __u8 *hmac; | |
1281 | ||
1282 | /* Get the first hmac that the peer told us to use */ | |
1283 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1284 | if (unlikely(!hmac_desc)) | |
1285 | return NULL; | |
1286 | ||
072017b4 | 1287 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
cea8768f MRL |
1288 | hmac_desc->hmac_len + sizeof(sctp_authhdr_t), |
1289 | GFP_ATOMIC); | |
4cd57c80 VY |
1290 | if (!retval) |
1291 | return NULL; | |
1292 | ||
1293 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1294 | auth_hdr.shkey_id = htons(asoc->active_key_id); | |
1295 | ||
1296 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), | |
1297 | &auth_hdr); | |
1298 | ||
aa9f979c | 1299 | hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len); |
4cd57c80 VY |
1300 | |
1301 | /* Adjust the chunk header to include the empty MAC */ | |
1302 | retval->chunk_hdr->length = | |
1303 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1304 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1305 | ||
1306 | return retval; | |
1307 | } | |
1308 | ||
1309 | ||
1da177e4 LT |
1310 | /******************************************************************** |
1311 | * 2nd Level Abstractions | |
1312 | ********************************************************************/ | |
1313 | ||
1314 | /* Turn an skb into a chunk. | |
1315 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1316 | * |
1317 | * sctpimpguide-05.txt Section 2.8.2 | |
1318 | * M1) Each time a new DATA chunk is transmitted | |
1319 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1320 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1321 | * and when to fast retransmit. | |
1322 | * | |
1da177e4 LT |
1323 | */ |
1324 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
1325 | const struct sctp_association *asoc, | |
cea8768f | 1326 | struct sock *sk, gfp_t gfp) |
1da177e4 LT |
1327 | { |
1328 | struct sctp_chunk *retval; | |
1329 | ||
cea8768f | 1330 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1331 | |
1332 | if (!retval) | |
1333 | goto nodata; | |
bb33381d DB |
1334 | if (!sk) |
1335 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1336 | |
79af02c2 | 1337 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1338 | retval->skb = skb; |
1339 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1340 | retval->singleton = 1; |
1da177e4 | 1341 | |
3dc0a548 | 1342 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1343 | |
1344 | /* Polish the bead hole. */ | |
1345 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1346 | INIT_LIST_HEAD(&retval->frag_list); | |
1347 | SCTP_DBG_OBJCNT_INC(chunk); | |
1348 | atomic_set(&retval->refcnt, 1); | |
1349 | ||
1350 | nodata: | |
1351 | return retval; | |
1352 | } | |
1353 | ||
1354 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1355 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1356 | union sctp_addr *dest) | |
1357 | { | |
f235fca3 | 1358 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1359 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1360 | } |
1361 | ||
1362 | /* Extract the source address from a chunk. */ | |
1363 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1364 | { | |
1365 | /* If we have a known transport, use that. */ | |
1366 | if (chunk->transport) { | |
6a1e5f33 | 1367 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1368 | } else { |
1369 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1370 | return &chunk->source; |
1da177e4 LT |
1371 | } |
1372 | } | |
1373 | ||
1374 | /* Create a new chunk, setting the type and flags headers from the | |
1375 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1376 | */ | |
072017b4 | 1377 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
1378 | __u8 type, __u8 flags, int paylen, |
1379 | gfp_t gfp) | |
1da177e4 LT |
1380 | { |
1381 | struct sctp_chunk *retval; | |
1382 | sctp_chunkhdr_t *chunk_hdr; | |
1383 | struct sk_buff *skb; | |
1384 | struct sock *sk; | |
1385 | ||
1386 | /* No need to allocate LL here, as this is only a chunk. */ | |
e2f036a9 | 1387 | skb = alloc_skb(SCTP_PAD4(sizeof(sctp_chunkhdr_t) + paylen), gfp); |
1da177e4 LT |
1388 | if (!skb) |
1389 | goto nodata; | |
1390 | ||
1391 | /* Make room for the chunk header. */ | |
1392 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); | |
1393 | chunk_hdr->type = type; | |
1394 | chunk_hdr->flags = flags; | |
1395 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); | |
1396 | ||
1397 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1398 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1399 | if (!retval) { |
1400 | kfree_skb(skb); | |
1401 | goto nodata; | |
1402 | } | |
1403 | ||
1404 | retval->chunk_hdr = chunk_hdr; | |
1405 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); | |
1406 | ||
4cd57c80 VY |
1407 | /* Determine if the chunk needs to be authenticated */ |
1408 | if (sctp_auth_send_cid(type, asoc)) | |
1409 | retval->auth = 1; | |
1410 | ||
1da177e4 LT |
1411 | return retval; |
1412 | nodata: | |
1413 | return NULL; | |
1414 | } | |
1415 | ||
072017b4 | 1416 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1417 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1418 | { |
cea8768f | 1419 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1420 | } |
1421 | ||
1422 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, | |
cea8768f MRL |
1423 | __u8 type, __u8 flags, int paylen, |
1424 | gfp_t gfp) | |
072017b4 | 1425 | { |
cea8768f | 1426 | struct sctp_chunk *chunk; |
072017b4 | 1427 | |
cea8768f | 1428 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1429 | if (chunk) |
1430 | sctp_control_set_owner_w(chunk); | |
1431 | ||
1432 | return chunk; | |
1433 | } | |
1da177e4 LT |
1434 | |
1435 | /* Release the memory occupied by a chunk. */ | |
1436 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1437 | { | |
a08de64d VY |
1438 | BUG_ON(!list_empty(&chunk->list)); |
1439 | list_del_init(&chunk->transmitted_list); | |
1440 | ||
c485658b DB |
1441 | consume_skb(chunk->skb); |
1442 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1443 | |
1444 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1445 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1446 | } | |
1447 | ||
1448 | /* Possibly, free the chunk. */ | |
1449 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1450 | { | |
1da177e4 LT |
1451 | /* Release our reference on the message tracker. */ |
1452 | if (chunk->msg) | |
1453 | sctp_datamsg_put(chunk->msg); | |
1454 | ||
1455 | sctp_chunk_put(chunk); | |
1456 | } | |
1457 | ||
1458 | /* Grab a reference to the chunk. */ | |
1459 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1460 | { | |
1461 | atomic_inc(&ch->refcnt); | |
1462 | } | |
1463 | ||
1464 | /* Release a reference to the chunk. */ | |
1465 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1466 | { | |
1467 | if (atomic_dec_and_test(&ch->refcnt)) | |
1468 | sctp_chunk_destroy(ch); | |
1469 | } | |
1470 | ||
1471 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1472 | * enough. | |
1473 | */ | |
1474 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1475 | { | |
1476 | void *target; | |
1477 | void *padding; | |
1478 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
e2f036a9 | 1479 | int padlen = SCTP_PAD4(chunklen) - chunklen; |
1da177e4 | 1480 | |
b080db58 | 1481 | padding = skb_put_zero(chunk->skb, padlen); |
1da177e4 LT |
1482 | target = skb_put(chunk->skb, len); |
1483 | ||
1da177e4 LT |
1484 | memcpy(target, data, len); |
1485 | ||
1486 | /* Adjust the chunk length field. */ | |
1487 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1488 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1489 | |
1490 | return target; | |
1491 | } | |
1492 | ||
5fa782c2 NH |
1493 | /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient |
1494 | * space in the chunk | |
1495 | */ | |
6daaf0de | 1496 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, |
1497 | int len, const void *data) | |
5fa782c2 | 1498 | { |
2e3219b5 | 1499 | if (skb_tailroom(chunk->skb) >= len) |
5fa782c2 NH |
1500 | return sctp_addto_chunk(chunk, len, data); |
1501 | else | |
1502 | return NULL; | |
1503 | } | |
1504 | ||
1da177e4 LT |
1505 | /* Append bytes from user space to the end of a chunk. Will panic if |
1506 | * chunk is not big enough. | |
1507 | * Returns a kernel err value. | |
1508 | */ | |
e0eb093e AV |
1509 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1510 | struct iov_iter *from) | |
1da177e4 | 1511 | { |
e0eb093e | 1512 | void *target; |
1da177e4 LT |
1513 | |
1514 | /* Make room in chunk for data. */ | |
1515 | target = skb_put(chunk->skb, len); | |
1516 | ||
1517 | /* Copy data (whole iovec) into chunk */ | |
3b6d4dbf | 1518 | if (!copy_from_iter_full(target, len, from)) |
e0eb093e | 1519 | return -EFAULT; |
1da177e4 LT |
1520 | |
1521 | /* Adjust the chunk length field. */ | |
1522 | chunk->chunk_hdr->length = | |
1523 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1524 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1525 | |
e0eb093e | 1526 | return 0; |
1da177e4 LT |
1527 | } |
1528 | ||
1529 | /* Helper function to assign a TSN if needed. This assumes that both | |
1530 | * the data_hdr and association have already been assigned. | |
1531 | */ | |
1532 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1533 | { | |
ab3e5e7b VY |
1534 | struct sctp_datamsg *msg; |
1535 | struct sctp_chunk *lchunk; | |
1536 | struct sctp_stream *stream; | |
1da177e4 LT |
1537 | __u16 ssn; |
1538 | __u16 sid; | |
1539 | ||
1540 | if (chunk->has_ssn) | |
1541 | return; | |
1542 | ||
ab3e5e7b VY |
1543 | /* All fragments will be on the same stream */ |
1544 | sid = ntohs(chunk->subh.data_hdr->stream); | |
cee360ab | 1545 | stream = &chunk->asoc->stream; |
1da177e4 | 1546 | |
ab3e5e7b VY |
1547 | /* Now assign the sequence number to the entire message. |
1548 | * All fragments must have the same stream sequence number. | |
1549 | */ | |
1550 | msg = chunk->msg; | |
1551 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1552 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1553 | ssn = 0; | |
1554 | } else { | |
1555 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
a8386317 | 1556 | ssn = sctp_ssn_next(stream, out, sid); |
ab3e5e7b | 1557 | else |
a8386317 | 1558 | ssn = sctp_ssn_peek(stream, out, sid); |
ab3e5e7b VY |
1559 | } |
1560 | ||
1561 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1562 | lchunk->has_ssn = 1; | |
1563 | } | |
1da177e4 LT |
1564 | } |
1565 | ||
1566 | /* Helper function to assign a TSN if needed. This assumes that both | |
1567 | * the data_hdr and association have already been assigned. | |
1568 | */ | |
1569 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1570 | { | |
1571 | if (!chunk->has_tsn) { | |
1572 | /* This is the last possible instant to | |
1573 | * assign a TSN. | |
1574 | */ | |
1575 | chunk->subh.data_hdr->tsn = | |
1576 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1577 | chunk->has_tsn = 1; | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | /* Create a CLOSED association to use with an incoming packet. */ | |
1582 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
3182cd84 | 1583 | struct sctp_chunk *chunk, |
dd0fc66f | 1584 | gfp_t gfp) |
1da177e4 LT |
1585 | { |
1586 | struct sctp_association *asoc; | |
1587 | struct sk_buff *skb; | |
1588 | sctp_scope_t scope; | |
1da177e4 LT |
1589 | |
1590 | /* Create the bare association. */ | |
1591 | scope = sctp_scope(sctp_source(chunk)); | |
1592 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1593 | if (!asoc) | |
1594 | goto nodata; | |
1595 | asoc->temp = 1; | |
1596 | skb = chunk->skb; | |
1597 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1598 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1599 | ||
1da177e4 LT |
1600 | nodata: |
1601 | return asoc; | |
1da177e4 LT |
1602 | } |
1603 | ||
1604 | /* Build a cookie representing asoc. | |
1605 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1606 | */ | |
1607 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
1608 | const struct sctp_association *asoc, | |
1609 | const struct sctp_chunk *init_chunk, | |
1610 | int *cookie_len, | |
1611 | const __u8 *raw_addrs, int addrs_len) | |
1612 | { | |
1613 | sctp_cookie_param_t *retval; | |
1614 | struct sctp_signed_cookie *cookie; | |
1da177e4 | 1615 | int headersize, bodysize; |
1da177e4 | 1616 | |
9834a2bb VY |
1617 | /* Header size is static data prior to the actual cookie, including |
1618 | * any padding. | |
1619 | */ | |
d808ad9a YH |
1620 | headersize = sizeof(sctp_paramhdr_t) + |
1621 | (sizeof(struct sctp_signed_cookie) - | |
9834a2bb | 1622 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1623 | bodysize = sizeof(struct sctp_cookie) |
1624 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1625 | ||
1626 | /* Pad out the cookie to a multiple to make the signature | |
1627 | * functions simpler to write. | |
1628 | */ | |
1629 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1630 | bodysize += SCTP_COOKIE_MULTIPLE | |
1631 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1632 | *cookie_len = headersize + bodysize; | |
1633 | ||
1da177e4 LT |
1634 | /* Clear this memory since we are sending this data structure |
1635 | * out on the network. | |
1636 | */ | |
af997d8c ACM |
1637 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1638 | if (!retval) | |
1639 | goto nodata; | |
1640 | ||
1da177e4 LT |
1641 | cookie = (struct sctp_signed_cookie *) retval->body; |
1642 | ||
1643 | /* Set up the parameter header. */ | |
1644 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1645 | retval->p.length = htons(*cookie_len); | |
1646 | ||
1647 | /* Copy the cookie part of the association itself. */ | |
1648 | cookie->c = asoc->c; | |
1649 | /* Save the raw address list length in the cookie. */ | |
1650 | cookie->c.raw_addr_list_len = addrs_len; | |
1651 | ||
1652 | /* Remember PR-SCTP capability. */ | |
1653 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1654 | ||
0f3fffd8 ISJ |
1655 | /* Save adaptation indication in the cookie. */ |
1656 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1657 | |
1658 | /* Set an expiration time for the cookie. */ | |
52db882f | 1659 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1660 | ktime_get_real()); |
1da177e4 LT |
1661 | |
1662 | /* Copy the peer's init packet. */ | |
1663 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1664 | ntohs(init_chunk->chunk_hdr->length)); | |
1665 | ||
1666 | /* Copy the raw local address list of the association. */ | |
1667 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1668 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1669 | ||
d808ad9a | 1670 | if (sctp_sk(ep->base.sk)->hmac) { |
5821c769 HX |
1671 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); |
1672 | int err; | |
1b489e11 | 1673 | |
1da177e4 | 1674 | /* Sign the message. */ |
5821c769 HX |
1675 | desc->tfm = sctp_sk(ep->base.sk)->hmac; |
1676 | desc->flags = 0; | |
1677 | ||
1678 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1679 | sizeof(ep->secret_key)) ?: | |
1680 | crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, | |
1681 | cookie->signature); | |
1682 | shash_desc_zero(desc); | |
1683 | if (err) | |
1b489e11 | 1684 | goto free_cookie; |
1da177e4 LT |
1685 | } |
1686 | ||
1da177e4 | 1687 | return retval; |
1b489e11 HX |
1688 | |
1689 | free_cookie: | |
1690 | kfree(retval); | |
1691 | nodata: | |
1692 | *cookie_len = 0; | |
1693 | return NULL; | |
1da177e4 LT |
1694 | } |
1695 | ||
1696 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1697 | struct sctp_association *sctp_unpack_cookie( | |
1698 | const struct sctp_endpoint *ep, | |
1699 | const struct sctp_association *asoc, | |
dd0fc66f | 1700 | struct sctp_chunk *chunk, gfp_t gfp, |
1da177e4 LT |
1701 | int *error, struct sctp_chunk **errp) |
1702 | { | |
1703 | struct sctp_association *retval = NULL; | |
1704 | struct sctp_signed_cookie *cookie; | |
1705 | struct sctp_cookie *bear_cookie; | |
1706 | int headersize, bodysize, fixed_size; | |
313e7b4d | 1707 | __u8 *digest = ep->digest; |
570617e7 | 1708 | unsigned int len; |
1da177e4 LT |
1709 | sctp_scope_t scope; |
1710 | struct sk_buff *skb = chunk->skb; | |
52db882f | 1711 | ktime_t kt; |
1da177e4 | 1712 | |
9834a2bb VY |
1713 | /* Header size is static data prior to the actual cookie, including |
1714 | * any padding. | |
1715 | */ | |
1716 | headersize = sizeof(sctp_chunkhdr_t) + | |
d808ad9a | 1717 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1718 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1719 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1720 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1721 | ||
1722 | /* Verify that the chunk looks like it even has a cookie. | |
1723 | * There must be enough room for our cookie and our peer's | |
1724 | * INIT chunk. | |
1725 | */ | |
1726 | len = ntohs(chunk->chunk_hdr->length); | |
1727 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1728 | goto malformed; | |
1729 | ||
1730 | /* Verify that the cookie has been padded out. */ | |
1731 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1732 | goto malformed; | |
1733 | ||
1734 | /* Process the cookie. */ | |
1735 | cookie = chunk->subh.cookie_hdr; | |
1736 | bear_cookie = &cookie->c; | |
1737 | ||
1738 | if (!sctp_sk(ep->base.sk)->hmac) | |
1739 | goto no_hmac; | |
1740 | ||
1741 | /* Check the signature. */ | |
5821c769 HX |
1742 | { |
1743 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); | |
1744 | int err; | |
1745 | ||
1746 | desc->tfm = sctp_sk(ep->base.sk)->hmac; | |
1747 | desc->flags = 0; | |
1748 | ||
1749 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1750 | sizeof(ep->secret_key)) ?: | |
1751 | crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, | |
1752 | digest); | |
1753 | shash_desc_zero(desc); | |
1754 | ||
1755 | if (err) { | |
1756 | *error = -SCTP_IERROR_NOMEM; | |
1757 | goto fail; | |
1758 | } | |
1b489e11 | 1759 | } |
1da177e4 LT |
1760 | |
1761 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
570617e7 DB |
1762 | *error = -SCTP_IERROR_BAD_SIG; |
1763 | goto fail; | |
1da177e4 LT |
1764 | } |
1765 | ||
1766 | no_hmac: | |
1767 | /* IG Section 2.35.2: | |
1768 | * 3) Compare the port numbers and the verification tag contained | |
1769 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1770 | * verification tag within the SCTP common header of the received | |
1771 | * packet. If these values do not match the packet MUST be silently | |
1772 | * discarded, | |
1773 | */ | |
1774 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1775 | *error = -SCTP_IERROR_BAD_TAG; | |
1776 | goto fail; | |
1777 | } | |
1778 | ||
9b1dfad0 | 1779 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1780 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1781 | *error = -SCTP_IERROR_BAD_PORTS; | |
1782 | goto fail; | |
1783 | } | |
1784 | ||
1785 | /* Check to see if the cookie is stale. If there is already | |
1786 | * an association, there is no need to check cookie's expiration | |
1787 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1788 | * If skb has been timestamped, then use the stamp, otherwise |
1789 | * use current time. This introduces a small possibility that | |
1790 | * that a cookie may be considered expired, but his would only slow | |
1791 | * down the new association establishment instead of every packet. | |
1da177e4 | 1792 | */ |
f236218b | 1793 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
52db882f | 1794 | kt = skb_get_ktime(skb); |
f236218b | 1795 | else |
cb5e173e | 1796 | kt = ktime_get_real(); |
f236218b | 1797 | |
67cb9366 | 1798 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
1da177e4 LT |
1799 | /* |
1800 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1801 | * | |
1802 | * Cause of error | |
1803 | * --------------- | |
1804 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1805 | * Cookie that has expired. | |
1806 | */ | |
1807 | len = ntohs(chunk->chunk_hdr->length); | |
1808 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1809 | if (*errp) { | |
52db882f | 1810 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
34bcca28 | 1811 | __be32 n = htonl(usecs); |
1da177e4 | 1812 | |
1da177e4 | 1813 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
00f1c2df WY |
1814 | sizeof(n)); |
1815 | sctp_addto_chunk(*errp, sizeof(n), &n); | |
1da177e4 LT |
1816 | *error = -SCTP_IERROR_STALE_COOKIE; |
1817 | } else | |
1818 | *error = -SCTP_IERROR_NOMEM; | |
1819 | ||
1820 | goto fail; | |
1821 | } | |
1822 | ||
1823 | /* Make a new base association. */ | |
1824 | scope = sctp_scope(sctp_source(chunk)); | |
1825 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1826 | if (!retval) { | |
1827 | *error = -SCTP_IERROR_NOMEM; | |
1828 | goto fail; | |
1829 | } | |
1830 | ||
1831 | /* Set up our peer's port number. */ | |
1832 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1833 | ||
1834 | /* Populate the association from the cookie. */ | |
1835 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1836 | ||
1837 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1838 | GFP_ATOMIC) < 0) { | |
1839 | *error = -SCTP_IERROR_NOMEM; | |
1840 | goto fail; | |
1841 | } | |
1842 | ||
1843 | /* Also, add the destination address. */ | |
1844 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1845 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1846 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1847 | GFP_ATOMIC); | |
1da177e4 LT |
1848 | } |
1849 | ||
1850 | retval->next_tsn = retval->c.initial_tsn; | |
1851 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1852 | retval->addip_serial = retval->c.initial_tsn; | |
cc16f00f | 1853 | retval->strreset_outseq = retval->c.initial_tsn; |
1da177e4 LT |
1854 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1855 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1856 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1857 | |
1858 | /* The INIT stuff will be done by the side effects. */ | |
1859 | return retval; | |
1860 | ||
1861 | fail: | |
1862 | if (retval) | |
1863 | sctp_association_free(retval); | |
1864 | ||
1865 | return NULL; | |
1866 | ||
1867 | malformed: | |
1868 | /* Yikes! The packet is either corrupt or deliberately | |
1869 | * malformed. | |
1870 | */ | |
1871 | *error = -SCTP_IERROR_MALFORMED; | |
1872 | goto fail; | |
1873 | } | |
1874 | ||
1875 | /******************************************************************** | |
1876 | * 3rd Level Abstractions | |
1877 | ********************************************************************/ | |
1878 | ||
1879 | struct __sctp_missing { | |
9f81bcd9 AV |
1880 | __be32 num_missing; |
1881 | __be16 type; | |
bc10502d | 1882 | } __packed; |
1da177e4 LT |
1883 | |
1884 | /* | |
1885 | * Report a missing mandatory parameter. | |
1886 | */ | |
1887 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
1888 | sctp_param_t paramtype, | |
1889 | struct sctp_chunk *chunk, | |
1890 | struct sctp_chunk **errp) | |
1891 | { | |
1892 | struct __sctp_missing report; | |
1893 | __u16 len; | |
1894 | ||
e2f036a9 | 1895 | len = SCTP_PAD4(sizeof(report)); |
1da177e4 LT |
1896 | |
1897 | /* Make an ERROR chunk, preparing enough room for | |
1898 | * returning multiple unknown parameters. | |
1899 | */ | |
1900 | if (!*errp) | |
1901 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1902 | ||
1903 | if (*errp) { | |
1904 | report.num_missing = htonl(1); | |
1905 | report.type = paramtype; | |
ebdfcad4 | 1906 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1907 | sizeof(report)); |
1908 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1909 | } |
1910 | ||
1911 | /* Stop processing this chunk. */ | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | /* Report an Invalid Mandatory Parameter. */ | |
1916 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1917 | struct sctp_chunk *chunk, | |
1918 | struct sctp_chunk **errp) | |
1919 | { | |
1920 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1921 | ||
1922 | if (!*errp) | |
1923 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1924 | ||
1925 | if (*errp) | |
00f1c2df | 1926 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1927 | |
1928 | /* Stop processing this chunk. */ | |
1929 | return 0; | |
1930 | } | |
1931 | ||
1932 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1933 | struct sctp_paramhdr *param, | |
1934 | const struct sctp_chunk *chunk, | |
1935 | struct sctp_chunk **errp) | |
1936 | { | |
7ab90804 VY |
1937 | /* This is a fatal error. Any accumulated non-fatal errors are |
1938 | * not reported. | |
1939 | */ | |
1940 | if (*errp) | |
1941 | sctp_chunk_free(*errp); | |
1942 | ||
1da177e4 | 1943 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1944 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1945 | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1949 | ||
1950 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1951 | * send back an indicator to the peer. | |
1952 | */ | |
1953 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1954 | union sctp_params param, | |
1955 | struct sctp_chunk *chunk, | |
1956 | struct sctp_chunk **errp) | |
1957 | { | |
1958 | __u16 len = ntohs(param.p->length); | |
1959 | ||
7ab90804 VY |
1960 | /* Processing of the HOST_NAME parameter will generate an |
1961 | * ABORT. If we've accumulated any non-fatal errors, they | |
1962 | * would be unrecognized parameters and we should not include | |
1963 | * them in the ABORT. | |
1964 | */ | |
1965 | if (*errp) | |
1966 | sctp_chunk_free(*errp); | |
1967 | ||
1968 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1da177e4 | 1969 | |
00f1c2df WY |
1970 | if (*errp) { |
1971 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); | |
1972 | sctp_addto_chunk(*errp, len, param.v); | |
1973 | } | |
1da177e4 LT |
1974 | |
1975 | /* Stop processing this chunk. */ | |
1976 | return 0; | |
1977 | } | |
1978 | ||
f53b5b09 | 1979 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
d6701191 VY |
1980 | { |
1981 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
1982 | int have_auth = 0; | |
1983 | int have_asconf = 0; | |
1984 | int i; | |
1985 | ||
1986 | for (i = 0; i < num_ext; i++) { | |
1987 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1988 | case SCTP_CID_AUTH: |
1989 | have_auth = 1; | |
1990 | break; | |
1991 | case SCTP_CID_ASCONF: | |
1992 | case SCTP_CID_ASCONF_ACK: | |
1993 | have_asconf = 1; | |
1994 | break; | |
d6701191 VY |
1995 | } |
1996 | } | |
1997 | ||
1998 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1999 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
2000 | * only if ADD-IP is turned on and we are not backward-compatible | |
2001 | * mode. | |
2002 | */ | |
e1fc3b14 | 2003 | if (net->sctp.addip_noauth) |
d6701191 VY |
2004 | return 1; |
2005 | ||
e1fc3b14 | 2006 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
d6701191 VY |
2007 | return 0; |
2008 | ||
2009 | return 1; | |
2010 | } | |
2011 | ||
131a47e3 VY |
2012 | static void sctp_process_ext_param(struct sctp_association *asoc, |
2013 | union sctp_params param) | |
2014 | { | |
e1fc3b14 | 2015 | struct net *net = sock_net(asoc->base.sk); |
131a47e3 VY |
2016 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
2017 | int i; | |
2018 | ||
2019 | for (i = 0; i < num_ext; i++) { | |
2020 | switch (param.ext->chunks[i]) { | |
c28445c3 XL |
2021 | case SCTP_CID_RECONF: |
2022 | if (asoc->reconf_enable && | |
2023 | !asoc->peer.reconf_capable) | |
2024 | asoc->peer.reconf_capable = 1; | |
2025 | break; | |
f7010e61 | 2026 | case SCTP_CID_FWD_TSN: |
28aa4c26 XL |
2027 | if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) |
2028 | asoc->peer.prsctp_capable = 1; | |
f7010e61 | 2029 | break; |
2030 | case SCTP_CID_AUTH: | |
2031 | /* if the peer reports AUTH, assume that he | |
2032 | * supports AUTH. | |
2033 | */ | |
b14878cc | 2034 | if (asoc->ep->auth_enable) |
f7010e61 | 2035 | asoc->peer.auth_capable = 1; |
2036 | break; | |
2037 | case SCTP_CID_ASCONF: | |
2038 | case SCTP_CID_ASCONF_ACK: | |
2039 | if (net->sctp.addip_enable) | |
2040 | asoc->peer.asconf_capable = 1; | |
2041 | break; | |
2042 | default: | |
2043 | break; | |
131a47e3 VY |
2044 | } |
2045 | } | |
2046 | } | |
2047 | ||
1da177e4 LT |
2048 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2049 | * | |
2050 | * The Parameter Types are encoded such that the | |
2051 | * highest-order two bits specify the action that must be | |
2052 | * taken if the processing endpoint does not recognize the | |
2053 | * Parameter Type. | |
2054 | * | |
7ab90804 VY |
2055 | * 00 - Stop processing this parameter; do not process any further |
2056 | * parameters within this chunk | |
1da177e4 | 2057 | * |
7ab90804 VY |
2058 | * 01 - Stop processing this parameter, do not process any further |
2059 | * parameters within this chunk, and report the unrecognized | |
2060 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2061 | * |
2062 | * 10 - Skip this parameter and continue processing. | |
2063 | * | |
2064 | * 11 - Skip this parameter and continue processing but | |
2065 | * report the unrecognized parameter in an | |
7ab90804 | 2066 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2067 | * |
2068 | * Return value: | |
7ab90804 VY |
2069 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2070 | * SCTP_IERROR_ERROR - stop and report an error. | |
2071 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2072 | */ |
7ab90804 VY |
2073 | static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, |
2074 | union sctp_params param, | |
2075 | struct sctp_chunk *chunk, | |
2076 | struct sctp_chunk **errp) | |
1da177e4 | 2077 | { |
7ab90804 | 2078 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2079 | |
2080 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2081 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2082 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2083 | break; |
2084 | case SCTP_PARAM_ACTION_SKIP: | |
2085 | break; | |
7ab90804 VY |
2086 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2087 | retval = SCTP_IERROR_ERROR; | |
2088 | /* Fall through */ | |
1da177e4 LT |
2089 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2090 | /* Make an ERROR chunk, preparing enough room for | |
2091 | * returning multiple unknown parameters. | |
2092 | */ | |
2093 | if (NULL == *errp) | |
5fa782c2 | 2094 | *errp = sctp_make_op_error_fixed(asoc, chunk); |
1da177e4 LT |
2095 | |
2096 | if (*errp) { | |
2205a6ea | 2097 | if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
e2f036a9 | 2098 | SCTP_PAD4(ntohs(param.p->length)))) |
2205a6ea | 2099 | sctp_addto_chunk_fixed(*errp, |
e2f036a9 | 2100 | SCTP_PAD4(ntohs(param.p->length)), |
2205a6ea | 2101 | param.v); |
1da177e4 LT |
2102 | } else { |
2103 | /* If there is no memory for generating the ERROR | |
2104 | * report as specified, an ABORT will be triggered | |
2105 | * to the peer and the association won't be | |
2106 | * established. | |
2107 | */ | |
7ab90804 | 2108 | retval = SCTP_IERROR_NOMEM; |
1da177e4 | 2109 | } |
1da177e4 LT |
2110 | break; |
2111 | default: | |
2112 | break; | |
2113 | } | |
2114 | ||
2115 | return retval; | |
2116 | } | |
2117 | ||
7ab90804 | 2118 | /* Verify variable length parameters |
1da177e4 | 2119 | * Return values: |
7ab90804 VY |
2120 | * SCTP_IERROR_ABORT - trigger an ABORT |
2121 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2122 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2123 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2124 | */ |
f53b5b09 | 2125 | static sctp_ierror_t sctp_verify_param(struct net *net, |
b14878cc | 2126 | const struct sctp_endpoint *ep, |
f53b5b09 | 2127 | const struct sctp_association *asoc, |
7ab90804 VY |
2128 | union sctp_params param, |
2129 | sctp_cid_t cid, | |
2130 | struct sctp_chunk *chunk, | |
2131 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2132 | { |
72da7b38 | 2133 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2134 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2135 | __u16 n_elt, id = 0; |
2136 | int i; | |
1da177e4 LT |
2137 | |
2138 | /* FIXME - This routine is not looking at each parameter per the | |
2139 | * chunk type, i.e., unrecognized parameters should be further | |
2140 | * identified based on the chunk id. | |
2141 | */ | |
2142 | ||
2143 | switch (param.p->type) { | |
2144 | case SCTP_PARAM_IPV4_ADDRESS: | |
2145 | case SCTP_PARAM_IPV6_ADDRESS: | |
2146 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2147 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2148 | case SCTP_PARAM_STATE_COOKIE: | |
2149 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2150 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2151 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2152 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2153 | break; |
2154 | ||
131a47e3 | 2155 | case SCTP_PARAM_SUPPORTED_EXT: |
f53b5b09 | 2156 | if (!sctp_verify_ext_param(net, param)) |
d6701191 | 2157 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2158 | break; |
2159 | ||
d6de3097 | 2160 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2161 | if (net->sctp.addip_enable) |
d6de3097 VY |
2162 | break; |
2163 | goto fallthrough; | |
2164 | ||
1da177e4 LT |
2165 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2166 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2167 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2168 | retval = SCTP_IERROR_ABORT; | |
2169 | break; | |
131a47e3 | 2170 | |
1da177e4 | 2171 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2172 | if (ep->prsctp_enable) |
1da177e4 | 2173 | break; |
730fc3d0 VY |
2174 | goto fallthrough; |
2175 | ||
2176 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2177 | if (!ep->auth_enable) |
730fc3d0 VY |
2178 | goto fallthrough; |
2179 | ||
2180 | /* SCTP-AUTH: Secion 6.1 | |
2181 | * If the random number is not 32 byte long the association | |
2182 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2183 | * cause 'Protocol Violation'. | |
2184 | */ | |
2185 | if (SCTP_AUTH_RANDOM_LENGTH != | |
7ab90804 VY |
2186 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { |
2187 | sctp_process_inv_paramlength(asoc, param.p, | |
730fc3d0 | 2188 | chunk, err_chunk); |
7ab90804 VY |
2189 | retval = SCTP_IERROR_ABORT; |
2190 | } | |
730fc3d0 VY |
2191 | break; |
2192 | ||
2193 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2194 | if (!ep->auth_enable) |
730fc3d0 VY |
2195 | goto fallthrough; |
2196 | ||
2197 | /* SCTP-AUTH: Section 3.2 | |
2198 | * The CHUNKS parameter MUST be included once in the INIT or | |
2199 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2200 | * chunks. Its maximum length is 260 bytes. | |
2201 | */ | |
7ab90804 VY |
2202 | if (260 < ntohs(param.p->length)) { |
2203 | sctp_process_inv_paramlength(asoc, param.p, | |
2204 | chunk, err_chunk); | |
2205 | retval = SCTP_IERROR_ABORT; | |
2206 | } | |
730fc3d0 VY |
2207 | break; |
2208 | ||
2209 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2210 | if (!ep->auth_enable) |
72da7b38 WY |
2211 | goto fallthrough; |
2212 | ||
2213 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
2214 | n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; | |
2215 | ||
2216 | /* SCTP-AUTH: Section 6.1 | |
2217 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2218 | * included in the HMAC-ALGO parameter. | |
2219 | */ | |
2220 | for (i = 0; i < n_elt; i++) { | |
2221 | id = ntohs(hmacs->hmac_ids[i]); | |
2222 | ||
2223 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2224 | break; | |
2225 | } | |
2226 | ||
2227 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2228 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2229 | err_chunk); | |
2230 | retval = SCTP_IERROR_ABORT; | |
2231 | } | |
2232 | break; | |
730fc3d0 | 2233 | fallthrough: |
1da177e4 | 2234 | default: |
bb33381d DB |
2235 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2236 | __func__, ntohs(param.p->type), cid); | |
2237 | ||
7ab90804 | 2238 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2239 | break; |
2240 | } | |
2241 | return retval; | |
2242 | } | |
2243 | ||
2244 | /* Verify the INIT packet before we process it. */ | |
b14878cc VY |
2245 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
2246 | const struct sctp_association *asoc, sctp_cid_t cid, | |
2247 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, | |
1da177e4 LT |
2248 | struct sctp_chunk **errp) |
2249 | { | |
2250 | union sctp_params param; | |
7613f5fe | 2251 | bool has_cookie = false; |
7ab90804 | 2252 | int result; |
1da177e4 | 2253 | |
7613f5fe DB |
2254 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2255 | * also mandatory, but is not checked here since the valid range | |
2256 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2257 | */ | |
2258 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2259 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2260 | peer_init->init_hdr.init_tag == 0 || | |
2261 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2262 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2263 | |
1da177e4 | 2264 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2265 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2266 | has_cookie = true; | |
2267 | } | |
1da177e4 LT |
2268 | |
2269 | /* There is a possibility that a parameter length was bad and | |
2270 | * in that case we would have stoped walking the parameters. | |
2271 | * The current param.p would point at the bad one. | |
2272 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2273 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2274 | * error handling code build and send the packet. | |
2275 | */ | |
26ac8e5f | 2276 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2277 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2278 | |
2279 | /* The only missing mandatory param possible today is | |
2280 | * the state cookie for an INIT-ACK chunk. | |
2281 | */ | |
7ab90804 VY |
2282 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2283 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2284 | chunk, errp); | |
1da177e4 | 2285 | |
7ab90804 | 2286 | /* Verify all the variable length parameters */ |
1da177e4 | 2287 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2288 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2289 | chunk, errp); | |
7ab90804 | 2290 | switch (result) { |
f7010e61 | 2291 | case SCTP_IERROR_ABORT: |
2292 | case SCTP_IERROR_NOMEM: | |
2293 | return 0; | |
2294 | case SCTP_IERROR_ERROR: | |
2295 | return 1; | |
2296 | case SCTP_IERROR_NO_ERROR: | |
2297 | default: | |
2298 | break; | |
1da177e4 LT |
2299 | } |
2300 | ||
2301 | } /* for (loop through all parameters) */ | |
2302 | ||
2303 | return 1; | |
2304 | } | |
2305 | ||
2306 | /* Unpack the parameters in an INIT packet into an association. | |
2307 | * Returns 0 on failure, else success. | |
2308 | * FIXME: This is an association method. | |
2309 | */ | |
de6becdc | 2310 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2311 | const union sctp_addr *peer_addr, |
dd0fc66f | 2312 | sctp_init_chunk_t *peer_init, gfp_t gfp) |
1da177e4 | 2313 | { |
e1fc3b14 | 2314 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2315 | union sctp_params param; |
2316 | struct sctp_transport *transport; | |
2317 | struct list_head *pos, *temp; | |
de6becdc WY |
2318 | struct sctp_af *af; |
2319 | union sctp_addr addr; | |
1da177e4 | 2320 | char *cookie; |
de6becdc | 2321 | int src_match = 0; |
1da177e4 LT |
2322 | |
2323 | /* We must include the address that the INIT packet came from. | |
2324 | * This is the only address that matters for an INIT packet. | |
2325 | * When processing a COOKIE ECHO, we retrieve the from address | |
2326 | * of the INIT from the cookie. | |
2327 | */ | |
2328 | ||
2329 | /* This implementation defaults to making the first transport | |
2330 | * added as the primary transport. The source address seems to | |
2331 | * be a a better choice than any of the embedded addresses. | |
2332 | */ | |
cb3f837b | 2333 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2334 | goto nomem; |
2335 | ||
2336 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2337 | src_match = 1; | |
1da177e4 LT |
2338 | |
2339 | /* Process the initialization parameters. */ | |
1da177e4 | 2340 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2341 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2342 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2343 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2344 | af->from_addr_param(&addr, param.addr, | |
2345 | chunk->sctp_hdr->source, 0); | |
2346 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2347 | src_match = 1; | |
2348 | } | |
1da177e4 LT |
2349 | |
2350 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2351 | goto clean_up; |
1da177e4 LT |
2352 | } |
2353 | ||
de6becdc WY |
2354 | /* source address of chunk may not match any valid address */ |
2355 | if (!src_match) | |
2356 | goto clean_up; | |
2357 | ||
730fc3d0 VY |
2358 | /* AUTH: After processing the parameters, make sure that we |
2359 | * have all the required info to potentially do authentications. | |
2360 | */ | |
2361 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2362 | !asoc->peer.peer_hmacs)) | |
2363 | asoc->peer.auth_capable = 0; | |
2364 | ||
d6701191 VY |
2365 | /* In a non-backward compatible mode, if the peer claims |
2366 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2367 | * that we MUST ABORT the association. Section 6. The section | |
2368 | * also give us an option to silently ignore the packet, which | |
2369 | * is what we'll do here. | |
6b2f9cb6 | 2370 | */ |
e1fc3b14 | 2371 | if (!net->sctp.addip_noauth && |
73d9c4fd | 2372 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
6b2f9cb6 VY |
2373 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2374 | SCTP_PARAM_DEL_IP | | |
2375 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2376 | asoc->peer.asconf_capable = 0; |
d6701191 | 2377 | goto clean_up; |
6b2f9cb6 VY |
2378 | } |
2379 | ||
3f7a87d2 FF |
2380 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2381 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2382 | transport = list_entry(pos, struct sctp_transport, transports); | |
2383 | if (transport->state == SCTP_UNKNOWN) { | |
2384 | sctp_assoc_rm_peer(asoc, transport); | |
2385 | } | |
2386 | } | |
2387 | ||
1da177e4 LT |
2388 | /* The fixed INIT headers are always in network byte |
2389 | * order. | |
2390 | */ | |
2391 | asoc->peer.i.init_tag = | |
2392 | ntohl(peer_init->init_hdr.init_tag); | |
2393 | asoc->peer.i.a_rwnd = | |
2394 | ntohl(peer_init->init_hdr.a_rwnd); | |
2395 | asoc->peer.i.num_outbound_streams = | |
2396 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2397 | asoc->peer.i.num_inbound_streams = | |
2398 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2399 | asoc->peer.i.initial_tsn = | |
2400 | ntohl(peer_init->init_hdr.initial_tsn); | |
2401 | ||
cc16f00f XL |
2402 | asoc->strreset_inseq = asoc->peer.i.initial_tsn; |
2403 | ||
1da177e4 LT |
2404 | /* Apply the upper bounds for output streams based on peer's |
2405 | * number of inbound streams. | |
2406 | */ | |
2407 | if (asoc->c.sinit_num_ostreams > | |
2408 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2409 | asoc->c.sinit_num_ostreams = | |
2410 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2411 | } | |
2412 | ||
2413 | if (asoc->c.sinit_max_instreams > | |
2414 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2415 | asoc->c.sinit_max_instreams = | |
2416 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2417 | } | |
2418 | ||
2419 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2420 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2421 | ||
2422 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2423 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2424 | ||
2425 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2426 | cookie = asoc->peer.cookie; | |
2427 | if (cookie) { | |
af997d8c | 2428 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2429 | if (!asoc->peer.cookie) |
2430 | goto clean_up; | |
1da177e4 LT |
2431 | } |
2432 | ||
2433 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2434 | * high (for example, implementations MAY use the size of the receiver | |
2435 | * advertised window). | |
2436 | */ | |
9dbc15f0 RD |
2437 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2438 | transports) { | |
1da177e4 LT |
2439 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2440 | } | |
2441 | ||
2442 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2443 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2444 | asoc->peer.i.initial_tsn, gfp)) | |
2445 | goto clean_up; | |
1da177e4 LT |
2446 | |
2447 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2448 | * | |
2449 | * The stream sequence number in all the streams shall start | |
2450 | * from 0 when the association is established. Also, when the | |
2451 | * stream sequence number reaches the value 65535 the next | |
2452 | * stream sequence number shall be set to 0. | |
2453 | */ | |
2454 | ||
ff356414 XL |
2455 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
2456 | asoc->c.sinit_max_instreams, gfp)) | |
7e062977 | 2457 | goto clean_up; |
1da177e4 | 2458 | |
7e062977 XL |
2459 | if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) |
2460 | goto clean_up; | |
1da177e4 LT |
2461 | |
2462 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2463 | * | |
2464 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2465 | * remote endpoint it should do the following: | |
2466 | * ... | |
2467 | * A2) A serial number should be assigned to the Chunk. The serial | |
2468 | * number should be a monotonically increasing number. All serial | |
2469 | * numbers are defined to be initialized at the start of the | |
2470 | * association to the same value as the Initial TSN. | |
2471 | */ | |
2472 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2473 | return 1; | |
2474 | ||
2475 | clean_up: | |
2476 | /* Release the transport structures. */ | |
2477 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2478 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2479 | if (transport->state != SCTP_ACTIVE) |
2480 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2481 | } |
3f7a87d2 | 2482 | |
1da177e4 LT |
2483 | nomem: |
2484 | return 0; | |
2485 | } | |
2486 | ||
2487 | ||
2488 | /* Update asoc with the option described in param. | |
2489 | * | |
2490 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2491 | * | |
2492 | * asoc is the association to update. | |
2493 | * param is the variable length parameter to use for update. | |
2494 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2495 | * If the current packet is an INIT we want to minimize the amount of | |
2496 | * work we do. In particular, we should not build transport | |
2497 | * structures for the addresses. | |
2498 | */ | |
2499 | static int sctp_process_param(struct sctp_association *asoc, | |
2500 | union sctp_params param, | |
2501 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2502 | gfp_t gfp) |
1da177e4 | 2503 | { |
e7ff4a70 | 2504 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2505 | union sctp_addr addr; |
2506 | int i; | |
2507 | __u16 sat; | |
2508 | int retval = 1; | |
2509 | sctp_scope_t scope; | |
3ef0a25b | 2510 | u32 stale; |
1da177e4 | 2511 | struct sctp_af *af; |
d6de3097 VY |
2512 | union sctp_addr_param *addr_param; |
2513 | struct sctp_transport *t; | |
b14878cc | 2514 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
2515 | |
2516 | /* We maintain all INIT parameters in network byte order all the | |
2517 | * time. This allows us to not worry about whether the parameters | |
2518 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2519 | */ | |
2520 | switch (param.p->type) { | |
2521 | case SCTP_PARAM_IPV6_ADDRESS: | |
2522 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2523 | break; | |
7dab83de VY |
2524 | goto do_addr_param; |
2525 | ||
1da177e4 | 2526 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2527 | /* v4 addresses are not allowed on v6-only socket */ |
2528 | if (ipv6_only_sock(asoc->base.sk)) | |
2529 | break; | |
2530 | do_addr_param: | |
1da177e4 | 2531 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2532 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2533 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2534 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2535 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2536 | return 0; |
2537 | break; | |
2538 | ||
2539 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2540 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2541 | break; |
2542 | ||
2543 | stale = ntohl(param.life->lifespan_increment); | |
2544 | ||
2545 | /* Suggested Cookie Life span increment's unit is msec, | |
2546 | * (1/1000sec). | |
2547 | */ | |
52db882f | 2548 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2549 | break; |
2550 | ||
2551 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2552 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2553 | break; |
2554 | ||
2555 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2556 | /* Turn off the default values first so we'll know which | |
2557 | * ones are really set by the peer. | |
2558 | */ | |
2559 | asoc->peer.ipv4_address = 0; | |
2560 | asoc->peer.ipv6_address = 0; | |
2561 | ||
140ee960 GJ |
2562 | /* Assume that peer supports the address family |
2563 | * by which it sends a packet. | |
2564 | */ | |
2565 | if (peer_addr->sa.sa_family == AF_INET6) | |
2566 | asoc->peer.ipv6_address = 1; | |
2567 | else if (peer_addr->sa.sa_family == AF_INET) | |
2568 | asoc->peer.ipv4_address = 1; | |
2569 | ||
1da177e4 LT |
2570 | /* Cycle through address types; avoid divide by 0. */ |
2571 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2572 | if (sat) | |
2573 | sat /= sizeof(__u16); | |
2574 | ||
2575 | for (i = 0; i < sat; ++i) { | |
2576 | switch (param.sat->types[i]) { | |
2577 | case SCTP_PARAM_IPV4_ADDRESS: | |
2578 | asoc->peer.ipv4_address = 1; | |
2579 | break; | |
2580 | ||
2581 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2582 | if (PF_INET6 == asoc->base.sk->sk_family) |
2583 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2584 | break; |
2585 | ||
2586 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2587 | asoc->peer.hostname_address = 1; | |
2588 | break; | |
2589 | ||
2590 | default: /* Just ignore anything else. */ | |
2591 | break; | |
3ff50b79 | 2592 | } |
1da177e4 LT |
2593 | } |
2594 | break; | |
2595 | ||
2596 | case SCTP_PARAM_STATE_COOKIE: | |
2597 | asoc->peer.cookie_len = | |
2598 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2599 | asoc->peer.cookie = param.cookie->body; | |
2600 | break; | |
2601 | ||
2602 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2603 | /* Would be odd to receive, but it causes no problems. */ | |
2604 | break; | |
2605 | ||
2606 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2607 | /* Rejected during verify stage. */ | |
2608 | break; | |
2609 | ||
2610 | case SCTP_PARAM_ECN_CAPABLE: | |
2611 | asoc->peer.ecn_capable = 1; | |
2612 | break; | |
2613 | ||
0f3fffd8 | 2614 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2615 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2616 | break; |
2617 | ||
d6de3097 | 2618 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2619 | if (!net->sctp.addip_enable) |
0ef46e28 VY |
2620 | goto fall_through; |
2621 | ||
d6de3097 VY |
2622 | addr_param = param.v + sizeof(sctp_addip_param_t); |
2623 | ||
cfbf654e | 2624 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2625 | if (af == NULL) |
2626 | break; | |
2627 | ||
d6de3097 VY |
2628 | af->from_addr_param(&addr, addr_param, |
2629 | htons(asoc->peer.port), 0); | |
2630 | ||
2631 | /* if the address is invalid, we can't process it. | |
2632 | * XXX: see spec for what to do. | |
2633 | */ | |
2634 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2635 | break; | |
2636 | ||
2637 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2638 | if (!t) | |
2639 | break; | |
2640 | ||
2641 | sctp_assoc_set_primary(asoc, t); | |
2642 | break; | |
2643 | ||
131a47e3 VY |
2644 | case SCTP_PARAM_SUPPORTED_EXT: |
2645 | sctp_process_ext_param(asoc, param); | |
2646 | break; | |
2647 | ||
1da177e4 | 2648 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2649 | if (asoc->prsctp_enable) { |
1da177e4 LT |
2650 | asoc->peer.prsctp_capable = 1; |
2651 | break; | |
2652 | } | |
d808ad9a | 2653 | /* Fall Through */ |
730fc3d0 VY |
2654 | goto fall_through; |
2655 | ||
2656 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2657 | if (!ep->auth_enable) |
730fc3d0 VY |
2658 | goto fall_through; |
2659 | ||
2660 | /* Save peer's random parameter */ | |
2661 | asoc->peer.peer_random = kmemdup(param.p, | |
2662 | ntohs(param.p->length), gfp); | |
2663 | if (!asoc->peer.peer_random) { | |
2664 | retval = 0; | |
2665 | break; | |
2666 | } | |
2667 | break; | |
2668 | ||
2669 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2670 | if (!ep->auth_enable) |
730fc3d0 VY |
2671 | goto fall_through; |
2672 | ||
2673 | /* Save peer's HMAC list */ | |
2674 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2675 | ntohs(param.p->length), gfp); | |
2676 | if (!asoc->peer.peer_hmacs) { | |
2677 | retval = 0; | |
2678 | break; | |
2679 | } | |
2680 | ||
2681 | /* Set the default HMAC the peer requested*/ | |
2682 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2683 | break; | |
2684 | ||
2685 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2686 | if (!ep->auth_enable) |
730fc3d0 VY |
2687 | goto fall_through; |
2688 | ||
2689 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2690 | ntohs(param.p->length), gfp); | |
2691 | if (!asoc->peer.peer_chunks) | |
2692 | retval = 0; | |
2693 | break; | |
2694 | fall_through: | |
1da177e4 LT |
2695 | default: |
2696 | /* Any unrecognized parameters should have been caught | |
2697 | * and handled by sctp_verify_param() which should be | |
2698 | * called prior to this routine. Simply log the error | |
2699 | * here. | |
2700 | */ | |
bb33381d DB |
2701 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2702 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2703 | break; |
3ff50b79 | 2704 | } |
1da177e4 LT |
2705 | |
2706 | return retval; | |
2707 | } | |
2708 | ||
2709 | /* Select a new verification tag. */ | |
2710 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2711 | { | |
2712 | /* I believe that this random number generator complies with RFC1750. | |
2713 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2714 | */ | |
2715 | __u32 x; | |
2716 | ||
2717 | do { | |
2718 | get_random_bytes(&x, sizeof(__u32)); | |
2719 | } while (x == 0); | |
2720 | ||
2721 | return x; | |
2722 | } | |
2723 | ||
2724 | /* Select an initial TSN to send during startup. */ | |
2725 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2726 | { | |
2727 | __u32 retval; | |
2728 | ||
2729 | get_random_bytes(&retval, sizeof(__u32)); | |
2730 | return retval; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2735 | * 0 1 2 3 | |
2736 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2737 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2738 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2739 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2740 | * | Serial Number | | |
2741 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2742 | * | Address Parameter | | |
2743 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2744 | * | ASCONF Parameter #1 | | |
2745 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2746 | * \ \ | |
2747 | * / .... / | |
2748 | * \ \ | |
2749 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2750 | * | ASCONF Parameter #N | | |
2751 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2752 | * | |
d808ad9a | 2753 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2754 | */ |
2755 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2756 | union sctp_addr *addr, | |
2757 | int vparam_len) | |
2758 | { | |
2759 | sctp_addiphdr_t asconf; | |
2760 | struct sctp_chunk *retval; | |
2761 | int length = sizeof(asconf) + vparam_len; | |
2762 | union sctp_addr_param addrparam; | |
2763 | int addrlen; | |
2764 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2765 | ||
2766 | addrlen = af->to_addr_param(addr, &addrparam); | |
2767 | if (!addrlen) | |
2768 | return NULL; | |
2769 | length += addrlen; | |
2770 | ||
2771 | /* Create the chunk. */ | |
cea8768f MRL |
2772 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2773 | GFP_ATOMIC); | |
1da177e4 LT |
2774 | if (!retval) |
2775 | return NULL; | |
2776 | ||
2777 | asconf.serial = htonl(asoc->addip_serial++); | |
2778 | ||
2779 | retval->subh.addip_hdr = | |
2780 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2781 | retval->param_hdr.v = | |
2782 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2783 | ||
2784 | return retval; | |
2785 | } | |
2786 | ||
2787 | /* ADDIP | |
2788 | * 3.2.1 Add IP Address | |
2789 | * 0 1 2 3 | |
2790 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2792 | * | Type = 0xC001 | Length = Variable | | |
2793 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2794 | * | ASCONF-Request Correlation ID | | |
2795 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2796 | * | Address Parameter | | |
2797 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2798 | * | |
2799 | * 3.2.2 Delete IP Address | |
2800 | * 0 1 2 3 | |
2801 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2802 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2803 | * | Type = 0xC002 | Length = Variable | | |
2804 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2805 | * | ASCONF-Request Correlation ID | | |
2806 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2807 | * | Address Parameter | | |
2808 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2809 | * | |
2810 | */ | |
2811 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
2812 | union sctp_addr *laddr, | |
2813 | struct sockaddr *addrs, | |
2814 | int addrcnt, | |
dbc16db1 | 2815 | __be16 flags) |
1da177e4 LT |
2816 | { |
2817 | sctp_addip_param_t param; | |
2818 | struct sctp_chunk *retval; | |
2819 | union sctp_addr_param addr_param; | |
2820 | union sctp_addr *addr; | |
2821 | void *addr_buf; | |
2822 | struct sctp_af *af; | |
2823 | int paramlen = sizeof(param); | |
2824 | int addr_param_len = 0; | |
2825 | int totallen = 0; | |
2826 | int i; | |
8a07eb0a | 2827 | int del_pickup = 0; |
1da177e4 LT |
2828 | |
2829 | /* Get total length of all the address parameters. */ | |
2830 | addr_buf = addrs; | |
2831 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2832 | addr = addr_buf; |
1da177e4 LT |
2833 | af = sctp_get_af_specific(addr->v4.sin_family); |
2834 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2835 | ||
2836 | totallen += paramlen; | |
2837 | totallen += addr_param_len; | |
2838 | ||
2839 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2840 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2841 | /* reuse the parameter length from the same scope one */ | |
2842 | totallen += paramlen; | |
2843 | totallen += addr_param_len; | |
2844 | del_pickup = 1; | |
bb33381d DB |
2845 | |
2846 | pr_debug("%s: picked same-scope del_pending addr, " | |
2847 | "totallen for all addresses is %d\n", | |
2848 | __func__, totallen); | |
8a07eb0a | 2849 | } |
1da177e4 LT |
2850 | } |
2851 | ||
2852 | /* Create an asconf chunk with the required length. */ | |
2853 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2854 | if (!retval) | |
2855 | return NULL; | |
2856 | ||
2857 | /* Add the address parameters to the asconf chunk. */ | |
2858 | addr_buf = addrs; | |
2859 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2860 | addr = addr_buf; |
1da177e4 LT |
2861 | af = sctp_get_af_specific(addr->v4.sin_family); |
2862 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2863 | param.param_hdr.type = flags; | |
2864 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2865 | param.crr_id = i; | |
2866 | ||
2867 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2868 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2869 | ||
2870 | addr_buf += af->sockaddr_len; | |
2871 | } | |
8a07eb0a MH |
2872 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2873 | addr = asoc->asconf_addr_del_pending; | |
2874 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2875 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2876 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2877 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2878 | param.crr_id = i; | |
2879 | ||
2880 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2881 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2882 | } | |
1da177e4 LT |
2883 | return retval; |
2884 | } | |
2885 | ||
2886 | /* ADDIP | |
2887 | * 3.2.4 Set Primary IP Address | |
2888 | * 0 1 2 3 | |
2889 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2890 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2891 | * | Type =0xC004 | Length = Variable | | |
2892 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2893 | * | ASCONF-Request Correlation ID | | |
2894 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2895 | * | Address Parameter | | |
2896 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2897 | * | |
d808ad9a | 2898 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2899 | */ |
2900 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2901 | union sctp_addr *addr) | |
2902 | { | |
2903 | sctp_addip_param_t param; | |
2904 | struct sctp_chunk *retval; | |
2905 | int len = sizeof(param); | |
2906 | union sctp_addr_param addrparam; | |
2907 | int addrlen; | |
2908 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2909 | ||
2910 | addrlen = af->to_addr_param(addr, &addrparam); | |
2911 | if (!addrlen) | |
2912 | return NULL; | |
2913 | len += addrlen; | |
2914 | ||
2915 | /* Create the chunk and make asconf header. */ | |
2916 | retval = sctp_make_asconf(asoc, addr, len); | |
2917 | if (!retval) | |
2918 | return NULL; | |
2919 | ||
2920 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2921 | param.param_hdr.length = htons(len); | |
2922 | param.crr_id = 0; | |
2923 | ||
2924 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2925 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2926 | ||
2927 | return retval; | |
2928 | } | |
2929 | ||
2930 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2931 | * 0 1 2 3 | |
2932 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2933 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2934 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2935 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2936 | * | Serial Number | | |
2937 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2938 | * | ASCONF Parameter Response#1 | | |
2939 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2940 | * \ \ | |
2941 | * / .... / | |
2942 | * \ \ | |
2943 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2944 | * | ASCONF Parameter Response#N | | |
2945 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2946 | * | |
d808ad9a | 2947 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2948 | */ |
2949 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2950 | __u32 serial, int vparam_len) | |
2951 | { | |
2952 | sctp_addiphdr_t asconf; | |
2953 | struct sctp_chunk *retval; | |
2954 | int length = sizeof(asconf) + vparam_len; | |
2955 | ||
2956 | /* Create the chunk. */ | |
cea8768f MRL |
2957 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2958 | GFP_ATOMIC); | |
1da177e4 LT |
2959 | if (!retval) |
2960 | return NULL; | |
2961 | ||
2962 | asconf.serial = htonl(serial); | |
2963 | ||
2964 | retval->subh.addip_hdr = | |
2965 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2966 | ||
2967 | return retval; | |
2968 | } | |
2969 | ||
2970 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2971 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
dbc16db1 | 2972 | __be16 err_code, sctp_addip_param_t *asconf_param) |
1da177e4 LT |
2973 | { |
2974 | sctp_addip_param_t ack_param; | |
2975 | sctp_errhdr_t err_param; | |
2976 | int asconf_param_len = 0; | |
2977 | int err_param_len = 0; | |
dbc16db1 | 2978 | __be16 response_type; |
1da177e4 LT |
2979 | |
2980 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2981 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2982 | } else { | |
2983 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2984 | err_param_len = sizeof(err_param); | |
2985 | if (asconf_param) | |
2986 | asconf_param_len = | |
2987 | ntohs(asconf_param->param_hdr.length); | |
2988 | } | |
2989 | ||
d808ad9a | 2990 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2991 | ack_param.param_hdr.type = response_type; |
2992 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2993 | err_param_len + | |
2994 | asconf_param_len); | |
2995 | ack_param.crr_id = crr_id; | |
2996 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2997 | ||
2998 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2999 | return; | |
3000 | ||
3001 | /* Add Error Cause parameter. */ | |
3002 | err_param.cause = err_code; | |
3003 | err_param.length = htons(err_param_len + asconf_param_len); | |
3004 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
3005 | ||
3006 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3007 | if (asconf_param) | |
3008 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3009 | } | |
3010 | ||
3011 | /* Process a asconf parameter. */ | |
dbc16db1 | 3012 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
1da177e4 LT |
3013 | struct sctp_chunk *asconf, |
3014 | sctp_addip_param_t *asconf_param) | |
3015 | { | |
3016 | struct sctp_transport *peer; | |
3017 | struct sctp_af *af; | |
3018 | union sctp_addr addr; | |
1da177e4 | 3019 | union sctp_addr_param *addr_param; |
5f242a13 | 3020 | |
ea110733 | 3021 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
c1cc678a | 3022 | |
44e65c1e WY |
3023 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3024 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3025 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3026 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3027 | ||
6a435732 | 3028 | switch (addr_param->p.type) { |
c4492586 WY |
3029 | case SCTP_PARAM_IPV6_ADDRESS: |
3030 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3031 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3032 | break; |
3033 | case SCTP_PARAM_IPV4_ADDRESS: | |
3034 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3035 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3036 | break; |
3037 | default: | |
945e5abc | 3038 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3039 | } |
3040 | ||
6a435732 | 3041 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3042 | if (unlikely(!af)) |
945e5abc | 3043 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3044 | |
dd86d136 | 3045 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3046 | |
3047 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3048 | * or multicast address. | |
3049 | * (note: wildcard is permitted and requires special handling so | |
3050 | * make sure we check for that) | |
3051 | */ | |
3052 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3053 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3054 | |
1da177e4 LT |
3055 | switch (asconf_param->param_hdr.type) { |
3056 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3057 | /* Section 4.2.1: |
3058 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3059 | * address of the packet MUST be added. | |
3060 | */ | |
3061 | if (af->is_any(&addr)) | |
3062 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3063 | ||
1da177e4 | 3064 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3065 | * request and does not have the local resources to add this |
3066 | * new address to the association, it MUST return an Error | |
3067 | * Cause TLV set to the new error code 'Operation Refused | |
3068 | * Due to Resource Shortage'. | |
3069 | */ | |
1da177e4 | 3070 | |
dd86d136 | 3071 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3072 | if (!peer) |
3073 | return SCTP_ERROR_RSRC_LOW; | |
3074 | ||
3075 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3076 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3077 | asoc->new_transport = peer; |
1da177e4 LT |
3078 | break; |
3079 | case SCTP_PARAM_DEL_IP: | |
3080 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3081 | * last remaining IP address of a peer endpoint, the receiver |
3082 | * MUST send an Error Cause TLV with the error cause set to the | |
3083 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3084 | */ | |
42e30bf3 | 3085 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3086 | return SCTP_ERROR_DEL_LAST_IP; |
3087 | ||
3088 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3089 | * address which is also the source address of the IP packet | |
3090 | * which contained the ASCONF chunk, the receiver MUST reject | |
3091 | * this request. To reject the request the receiver MUST send | |
3092 | * an Error Cause TLV set to the new error code 'Request to | |
3093 | * Delete Source IP Address' | |
3094 | */ | |
b1364104 | 3095 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3096 | return SCTP_ERROR_DEL_SRC_IP; |
3097 | ||
42e30bf3 VY |
3098 | /* Section 4.2.2 |
3099 | * If the address 0.0.0.0 or ::0 is provided, all | |
3100 | * addresses of the peer except the source address of the | |
3101 | * packet MUST be deleted. | |
3102 | */ | |
3103 | if (af->is_any(&addr)) { | |
3104 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3105 | sctp_assoc_del_nonprimary_peers(asoc, | |
3106 | asconf->transport); | |
7c5a9461 | 3107 | return SCTP_ERROR_NO_ERROR; |
3108 | } | |
3109 | ||
3110 | /* If the address is not part of the association, the | |
3111 | * ASCONF-ACK with Error Cause Indication Parameter | |
3112 | * which including cause of Unresolvable Address should | |
3113 | * be sent. | |
3114 | */ | |
3115 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3116 | if (!peer) | |
3117 | return SCTP_ERROR_DNS_FAILED; | |
3118 | ||
3119 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3120 | break; |
3121 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3122 | /* ADDIP Section 4.2.4 |
3123 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3124 | * MAY mark the source address of the packet as its | |
3125 | * primary. | |
3126 | */ | |
3127 | if (af->is_any(&addr)) | |
3128 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3129 | ||
dd86d136 | 3130 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3131 | if (!peer) |
945e5abc | 3132 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3133 | |
3134 | sctp_assoc_set_primary(asoc, peer); | |
3135 | break; | |
1da177e4 LT |
3136 | } |
3137 | ||
3138 | return SCTP_ERROR_NO_ERROR; | |
3139 | } | |
3140 | ||
9de7922b DB |
3141 | /* Verify the ASCONF packet before we process it. */ |
3142 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3143 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3144 | struct sctp_paramhdr **errp) | |
3145 | { | |
3146 | sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; | |
6f4c618d | 3147 | union sctp_params param; |
9de7922b | 3148 | bool addr_param_seen = false; |
6f4c618d | 3149 | |
9de7922b DB |
3150 | sctp_walk_params(param, addip, addip_hdr.params) { |
3151 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3152 | |
9de7922b | 3153 | *errp = param.p; |
6f4c618d | 3154 | switch (param.p->type) { |
9de7922b DB |
3155 | case SCTP_PARAM_ERR_CAUSE: |
3156 | break; | |
3157 | case SCTP_PARAM_IPV4_ADDRESS: | |
3158 | if (length != sizeof(sctp_ipv4addr_param_t)) | |
3159 | return false; | |
ce7b4ccc | 3160 | /* ensure there is only one addr param and it's in the |
3161 | * beginning of addip_hdr params, or we reject it. | |
3162 | */ | |
3163 | if (param.v != addip->addip_hdr.params) | |
3164 | return false; | |
9de7922b DB |
3165 | addr_param_seen = true; |
3166 | break; | |
3167 | case SCTP_PARAM_IPV6_ADDRESS: | |
3168 | if (length != sizeof(sctp_ipv6addr_param_t)) | |
3169 | return false; | |
ce7b4ccc | 3170 | if (param.v != addip->addip_hdr.params) |
3171 | return false; | |
9de7922b DB |
3172 | addr_param_seen = true; |
3173 | break; | |
6f4c618d WY |
3174 | case SCTP_PARAM_ADD_IP: |
3175 | case SCTP_PARAM_DEL_IP: | |
3176 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3177 | /* In ASCONF chunks, these need to be first. */ |
3178 | if (addr_param_needed && !addr_param_seen) | |
3179 | return false; | |
3180 | length = ntohs(param.addip->param_hdr.length); | |
3181 | if (length < sizeof(sctp_addip_param_t) + | |
3182 | sizeof(sctp_paramhdr_t)) | |
3183 | return false; | |
6f4c618d WY |
3184 | break; |
3185 | case SCTP_PARAM_SUCCESS_REPORT: | |
3186 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
3187 | if (length != sizeof(sctp_addip_param_t)) | |
9de7922b | 3188 | return false; |
6f4c618d WY |
3189 | break; |
3190 | default: | |
9de7922b DB |
3191 | /* This is unkown to us, reject! */ |
3192 | return false; | |
6f4c618d | 3193 | } |
6f4c618d WY |
3194 | } |
3195 | ||
9de7922b DB |
3196 | /* Remaining sanity checks. */ |
3197 | if (addr_param_needed && !addr_param_seen) | |
3198 | return false; | |
3199 | if (!addr_param_needed && addr_param_seen) | |
3200 | return false; | |
3201 | if (param.v != chunk->chunk_end) | |
3202 | return false; | |
6f4c618d | 3203 | |
9de7922b | 3204 | return true; |
6f4c618d WY |
3205 | } |
3206 | ||
d808ad9a | 3207 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3208 | * return an ASCONF_ACK chunk to be sent in response. |
3209 | */ | |
3210 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3211 | struct sctp_chunk *asconf) | |
3212 | { | |
9de7922b DB |
3213 | sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; |
3214 | bool all_param_pass = true; | |
3215 | union sctp_params param; | |
1da177e4 LT |
3216 | sctp_addiphdr_t *hdr; |
3217 | union sctp_addr_param *addr_param; | |
1da177e4 | 3218 | struct sctp_chunk *asconf_ack; |
dbc16db1 | 3219 | __be16 err_code; |
1da177e4 | 3220 | int length = 0; |
f3830ccc | 3221 | int chunk_len; |
1da177e4 | 3222 | __u32 serial; |
1da177e4 | 3223 | |
f3830ccc | 3224 | chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); |
1da177e4 LT |
3225 | hdr = (sctp_addiphdr_t *)asconf->skb->data; |
3226 | serial = ntohl(hdr->serial); | |
3227 | ||
d808ad9a | 3228 | /* Skip the addiphdr and store a pointer to address parameter. */ |
1da177e4 LT |
3229 | length = sizeof(sctp_addiphdr_t); |
3230 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
3231 | chunk_len -= length; | |
3232 | ||
3233 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3234 | * asconf parameter. |
d808ad9a | 3235 | */ |
6a435732 | 3236 | length = ntohs(addr_param->p.length); |
1da177e4 LT |
3237 | chunk_len -= length; |
3238 | ||
d808ad9a | 3239 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3240 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3241 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3242 | * parameters. |
1da177e4 | 3243 | */ |
2cab86be | 3244 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3245 | if (!asconf_ack) |
3246 | goto done; | |
3247 | ||
3248 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3249 | sctp_walk_params(param, addip, addip_hdr.params) { |
3250 | /* Skip preceeding address parameters. */ | |
3251 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3252 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3253 | continue; | |
3254 | ||
1da177e4 | 3255 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3256 | param.addip); |
1da177e4 LT |
3257 | /* ADDIP 4.1 A7) |
3258 | * If an error response is received for a TLV parameter, | |
3259 | * all TLVs with no response before the failed TLV are | |
3260 | * considered successful if not reported. All TLVs after | |
3261 | * the failed response are considered unsuccessful unless | |
3262 | * a specific success indication is present for the parameter. | |
3263 | */ | |
9de7922b DB |
3264 | if (err_code != SCTP_ERROR_NO_ERROR) |
3265 | all_param_pass = false; | |
1da177e4 | 3266 | if (!all_param_pass) |
9de7922b DB |
3267 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3268 | err_code, param.addip); | |
1da177e4 LT |
3269 | |
3270 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3271 | * an IP address sends an 'Out of Resource' in its response, it | |
3272 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3273 | * in the ASCONF. |
1da177e4 | 3274 | */ |
9de7922b | 3275 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3276 | goto done; |
1da177e4 | 3277 | } |
1da177e4 LT |
3278 | done: |
3279 | asoc->peer.addip_serial++; | |
3280 | ||
3281 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3282 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3283 | */ |
3284 | if (asconf_ack) { | |
1da177e4 | 3285 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3286 | list_add_tail(&asconf_ack->transmitted_list, |
3287 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3288 | } |
3289 | ||
3290 | return asconf_ack; | |
3291 | } | |
3292 | ||
3293 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3294 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
1da177e4 LT |
3295 | sctp_addip_param_t *asconf_param) |
3296 | { | |
3297 | struct sctp_af *af; | |
3298 | union sctp_addr addr; | |
3299 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; | |
3300 | union sctp_addr_param *addr_param; | |
1da177e4 | 3301 | struct sctp_transport *transport; |
dc022a98 | 3302 | struct sctp_sockaddr_entry *saddr; |
1da177e4 | 3303 | |
ea110733 | 3304 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
1da177e4 LT |
3305 | |
3306 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3307 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3308 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3309 | |
3310 | switch (asconf_param->param_hdr.type) { | |
3311 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3312 | /* This is always done in BH context with a socket lock |
3313 | * held, so the list can not change. | |
3314 | */ | |
0ed90fb0 | 3315 | local_bh_disable(); |
559cf710 | 3316 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3317 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3318 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3319 | } |
0ed90fb0 | 3320 | local_bh_enable(); |
3cd9749c WY |
3321 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3322 | transports) { | |
c86a773c | 3323 | sctp_transport_dst_release(transport); |
3cd9749c | 3324 | } |
1da177e4 LT |
3325 | break; |
3326 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3327 | local_bh_disable(); |
425e0f68 | 3328 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3329 | if (asoc->asconf_addr_del_pending != NULL && |
3330 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3331 | kfree(asoc->asconf_addr_del_pending); | |
3332 | asoc->asconf_addr_del_pending = NULL; | |
3333 | } | |
0ed90fb0 | 3334 | local_bh_enable(); |
9dbc15f0 RD |
3335 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3336 | transports) { | |
c86a773c | 3337 | sctp_transport_dst_release(transport); |
1da177e4 LT |
3338 | } |
3339 | break; | |
3340 | default: | |
3341 | break; | |
3342 | } | |
1da177e4 LT |
3343 | } |
3344 | ||
3345 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3346 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3347 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3348 | * ADDIP 4.1 |
3349 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3350 | * response before the failed TLV are considered successful if not reported. | |
3351 | * All TLVs after the failed response are considered unsuccessful unless a | |
3352 | * specific success indication is present for the parameter. | |
3353 | */ | |
dbc16db1 | 3354 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
1da177e4 LT |
3355 | sctp_addip_param_t *asconf_param, |
3356 | int no_err) | |
3357 | { | |
3358 | sctp_addip_param_t *asconf_ack_param; | |
3359 | sctp_errhdr_t *err_param; | |
3360 | int length; | |
f3830ccc | 3361 | int asconf_ack_len; |
dbc16db1 | 3362 | __be16 err_code; |
1da177e4 LT |
3363 | |
3364 | if (no_err) | |
3365 | err_code = SCTP_ERROR_NO_ERROR; | |
3366 | else | |
3367 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3368 | ||
f3830ccc WY |
3369 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
3370 | sizeof(sctp_chunkhdr_t); | |
3371 | ||
1da177e4 LT |
3372 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3373 | * the first asconf_ack parameter. | |
d808ad9a | 3374 | */ |
1da177e4 LT |
3375 | length = sizeof(sctp_addiphdr_t); |
3376 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + | |
3377 | length); | |
3378 | asconf_ack_len -= length; | |
3379 | ||
3380 | while (asconf_ack_len > 0) { | |
3381 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3382 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3383 | case SCTP_PARAM_SUCCESS_REPORT: |
3384 | return SCTP_ERROR_NO_ERROR; | |
3385 | case SCTP_PARAM_ERR_CAUSE: | |
3386 | length = sizeof(sctp_addip_param_t); | |
ea110733 | 3387 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3388 | asconf_ack_len -= length; |
3389 | if (asconf_ack_len > 0) | |
3390 | return err_param->cause; | |
3391 | else | |
3392 | return SCTP_ERROR_INV_PARAM; | |
3393 | break; | |
3394 | default: | |
3395 | return SCTP_ERROR_INV_PARAM; | |
3396 | } | |
3397 | } | |
3398 | ||
3399 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3400 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3401 | asconf_ack_len -= length; |
3402 | } | |
3403 | ||
3404 | return err_code; | |
3405 | } | |
3406 | ||
3407 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3408 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3409 | struct sctp_chunk *asconf_ack) | |
3410 | { | |
3411 | struct sctp_chunk *asconf = asoc->addip_last_asconf; | |
3412 | union sctp_addr_param *addr_param; | |
3413 | sctp_addip_param_t *asconf_param; | |
3414 | int length = 0; | |
3415 | int asconf_len = asconf->skb->len; | |
3416 | int all_param_pass = 0; | |
3417 | int no_err = 1; | |
3418 | int retval = 0; | |
dbc16db1 | 3419 | __be16 err_code = SCTP_ERROR_NO_ERROR; |
1da177e4 LT |
3420 | |
3421 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3422 | * a pointer to address parameter. | |
d808ad9a | 3423 | */ |
1da177e4 LT |
3424 | length = sizeof(sctp_addip_chunk_t); |
3425 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
3426 | asconf_len -= length; | |
3427 | ||
3428 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3429 | * pointer to the first asconf parameter. |
d808ad9a | 3430 | */ |
6a435732 | 3431 | length = ntohs(addr_param->p.length); |
ea110733 | 3432 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3433 | asconf_len -= length; |
3434 | ||
3435 | /* ADDIP 4.1 | |
3436 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3437 | * failures are indicated, then all request(s) are considered | |
3438 | * successful. | |
3439 | */ | |
3440 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) | |
3441 | all_param_pass = 1; | |
3442 | ||
3443 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3444 | while (asconf_len > 0) { | |
3445 | if (all_param_pass) | |
3446 | err_code = SCTP_ERROR_NO_ERROR; | |
3447 | else { | |
3448 | err_code = sctp_get_asconf_response(asconf_ack, | |
3449 | asconf_param, | |
3450 | no_err); | |
3451 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3452 | no_err = 0; | |
3453 | } | |
3454 | ||
3455 | switch (err_code) { | |
3456 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3457 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3458 | break; |
3459 | ||
3460 | case SCTP_ERROR_RSRC_LOW: | |
3461 | retval = 1; | |
3462 | break; | |
3463 | ||
a987f762 | 3464 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3465 | /* Disable sending this type of asconf parameter in |
3466 | * future. | |
d808ad9a | 3467 | */ |
1da177e4 LT |
3468 | asoc->peer.addip_disabled_mask |= |
3469 | asconf_param->param_hdr.type; | |
3470 | break; | |
3471 | ||
3472 | case SCTP_ERROR_REQ_REFUSED: | |
3473 | case SCTP_ERROR_DEL_LAST_IP: | |
3474 | case SCTP_ERROR_DEL_SRC_IP: | |
3475 | default: | |
3476 | break; | |
3477 | } | |
3478 | ||
3479 | /* Skip the processed asconf parameter and move to the next | |
3480 | * one. | |
d808ad9a | 3481 | */ |
1da177e4 | 3482 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3483 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3484 | asconf_len -= length; |
3485 | } | |
3486 | ||
ddc4bbee | 3487 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3488 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3489 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3490 | } | |
8a07eb0a | 3491 | |
1da177e4 | 3492 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3493 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3494 | sctp_chunk_free(asconf); |
3495 | asoc->addip_last_asconf = NULL; | |
3496 | ||
1da177e4 LT |
3497 | return retval; |
3498 | } | |
3499 | ||
d808ad9a | 3500 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3501 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3502 | __u32 new_cum_tsn, size_t nstreams, | |
3503 | struct sctp_fwdtsn_skip *skiplist) | |
3504 | { | |
3505 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3506 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3507 | struct sctp_fwdtsn_skip skip; |
3508 | size_t hint; | |
3509 | int i; | |
3510 | ||
3511 | hint = (nstreams + 1) * sizeof(__u32); | |
3512 | ||
cea8768f | 3513 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3514 | |
3515 | if (!retval) | |
3516 | return NULL; | |
3517 | ||
1da177e4 LT |
3518 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3519 | retval->subh.fwdtsn_hdr = | |
3520 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3521 | ||
3522 | for (i = 0; i < nstreams; i++) { | |
3523 | skip.stream = skiplist[i].stream; | |
3524 | skip.ssn = skiplist[i].ssn; | |
3525 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3526 | } | |
3527 | ||
3528 | return retval; | |
3529 | } | |
cc16f00f XL |
3530 | |
3531 | /* RE-CONFIG 3.1 (RE-CONFIG chunk) | |
3532 | * 0 1 2 3 | |
3533 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3534 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3535 | * | Type = 130 | Chunk Flags | Chunk Length | | |
3536 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3537 | * \ \ | |
3538 | * / Re-configuration Parameter / | |
3539 | * \ \ | |
3540 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3541 | * \ \ | |
3542 | * / Re-configuration Parameter (optional) / | |
3543 | * \ \ | |
3544 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3545 | */ | |
3546 | static struct sctp_chunk *sctp_make_reconf( | |
3547 | const struct sctp_association *asoc, | |
3548 | int length) | |
3549 | { | |
3550 | struct sctp_reconf_chunk *reconf; | |
3551 | struct sctp_chunk *retval; | |
3552 | ||
3553 | retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, | |
3554 | GFP_ATOMIC); | |
3555 | if (!retval) | |
3556 | return NULL; | |
3557 | ||
3558 | reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; | |
3559 | retval->param_hdr.v = reconf->params; | |
3560 | ||
3561 | return retval; | |
3562 | } | |
3563 | ||
3564 | /* RE-CONFIG 4.1 (STREAM OUT RESET) | |
3565 | * 0 1 2 3 | |
3566 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3567 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3568 | * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | | |
3569 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3570 | * | Re-configuration Request Sequence Number | | |
3571 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3572 | * | Re-configuration Response Sequence Number | | |
3573 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3574 | * | Sender's Last Assigned TSN | | |
3575 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3576 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3577 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3578 | * / ...... / | |
3579 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3580 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3581 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3582 | * | |
3583 | * RE-CONFIG 4.2 (STREAM IN RESET) | |
3584 | * 0 1 2 3 | |
3585 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3586 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3587 | * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | | |
3588 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3589 | * | Re-configuration Request Sequence Number | | |
3590 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3591 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3592 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3593 | * / ...... / | |
3594 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3595 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3596 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3597 | */ | |
3598 | struct sctp_chunk *sctp_make_strreset_req( | |
3599 | const struct sctp_association *asoc, | |
3600 | __u16 stream_num, __u16 *stream_list, | |
3601 | bool out, bool in) | |
3602 | { | |
3603 | struct sctp_strreset_outreq outreq; | |
3604 | __u16 stream_len = stream_num * 2; | |
3605 | struct sctp_strreset_inreq inreq; | |
3606 | struct sctp_chunk *retval; | |
16e1a919 | 3607 | __u16 outlen, inlen; |
cc16f00f XL |
3608 | |
3609 | outlen = (sizeof(outreq) + stream_len) * out; | |
3610 | inlen = (sizeof(inreq) + stream_len) * in; | |
3611 | ||
3612 | retval = sctp_make_reconf(asoc, outlen + inlen); | |
3613 | if (!retval) | |
3614 | return NULL; | |
3615 | ||
cc16f00f XL |
3616 | if (outlen) { |
3617 | outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; | |
3618 | outreq.param_hdr.length = htons(outlen); | |
3619 | outreq.request_seq = htonl(asoc->strreset_outseq); | |
3620 | outreq.response_seq = htonl(asoc->strreset_inseq - 1); | |
3621 | outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); | |
3622 | ||
3623 | sctp_addto_chunk(retval, sizeof(outreq), &outreq); | |
3624 | ||
3625 | if (stream_len) | |
3626 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3627 | } | |
3628 | ||
3629 | if (inlen) { | |
3630 | inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; | |
3631 | inreq.param_hdr.length = htons(inlen); | |
3632 | inreq.request_seq = htonl(asoc->strreset_outseq + out); | |
3633 | ||
3634 | sctp_addto_chunk(retval, sizeof(inreq), &inreq); | |
3635 | ||
3636 | if (stream_len) | |
3637 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3638 | } | |
3639 | ||
cc16f00f XL |
3640 | return retval; |
3641 | } | |
c56480a1 XL |
3642 | |
3643 | /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) | |
3644 | * 0 1 2 3 | |
3645 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3646 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3647 | * | Parameter Type = 15 | Parameter Length = 8 | | |
3648 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3649 | * | Re-configuration Request Sequence Number | | |
3650 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3651 | */ | |
3652 | struct sctp_chunk *sctp_make_strreset_tsnreq( | |
3653 | const struct sctp_association *asoc) | |
3654 | { | |
3655 | struct sctp_strreset_tsnreq tsnreq; | |
3656 | __u16 length = sizeof(tsnreq); | |
3657 | struct sctp_chunk *retval; | |
3658 | ||
3659 | retval = sctp_make_reconf(asoc, length); | |
3660 | if (!retval) | |
3661 | return NULL; | |
3662 | ||
3663 | tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; | |
3664 | tsnreq.param_hdr.length = htons(length); | |
3665 | tsnreq.request_seq = htonl(asoc->strreset_outseq); | |
3666 | ||
3667 | sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); | |
3668 | ||
3669 | return retval; | |
3670 | } | |
78098117 XL |
3671 | |
3672 | /* RE-CONFIG 4.5/4.6 (ADD STREAM) | |
3673 | * 0 1 2 3 | |
3674 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3675 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3676 | * | Parameter Type = 17 | Parameter Length = 12 | | |
3677 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3678 | * | Re-configuration Request Sequence Number | | |
3679 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3680 | * | Number of new streams | Reserved | | |
3681 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3682 | */ | |
3683 | struct sctp_chunk *sctp_make_strreset_addstrm( | |
3684 | const struct sctp_association *asoc, | |
3685 | __u16 out, __u16 in) | |
3686 | { | |
3687 | struct sctp_strreset_addstrm addstrm; | |
3688 | __u16 size = sizeof(addstrm); | |
3689 | struct sctp_chunk *retval; | |
3690 | ||
3691 | retval = sctp_make_reconf(asoc, (!!out + !!in) * size); | |
3692 | if (!retval) | |
3693 | return NULL; | |
3694 | ||
3695 | if (out) { | |
3696 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; | |
3697 | addstrm.param_hdr.length = htons(size); | |
3698 | addstrm.number_of_streams = htons(out); | |
3699 | addstrm.request_seq = htonl(asoc->strreset_outseq); | |
3700 | addstrm.reserved = 0; | |
3701 | ||
3702 | sctp_addto_chunk(retval, size, &addstrm); | |
3703 | } | |
3704 | ||
3705 | if (in) { | |
3706 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; | |
3707 | addstrm.param_hdr.length = htons(size); | |
3708 | addstrm.number_of_streams = htons(in); | |
3709 | addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); | |
3710 | addstrm.reserved = 0; | |
3711 | ||
3712 | sctp_addto_chunk(retval, size, &addstrm); | |
3713 | } | |
3714 | ||
3715 | return retval; | |
3716 | } | |
bd4b9f8b XL |
3717 | |
3718 | /* RE-CONFIG 4.4 (RESP) | |
3719 | * 0 1 2 3 | |
3720 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3721 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3722 | * | Parameter Type = 16 | Parameter Length | | |
3723 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3724 | * | Re-configuration Response Sequence Number | | |
3725 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3726 | * | Result | | |
3727 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3728 | */ | |
3729 | struct sctp_chunk *sctp_make_strreset_resp( | |
3730 | const struct sctp_association *asoc, | |
3731 | __u32 result, __u32 sn) | |
3732 | { | |
3733 | struct sctp_strreset_resp resp; | |
3734 | __u16 length = sizeof(resp); | |
3735 | struct sctp_chunk *retval; | |
3736 | ||
3737 | retval = sctp_make_reconf(asoc, length); | |
3738 | if (!retval) | |
3739 | return NULL; | |
3740 | ||
3741 | resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3742 | resp.param_hdr.length = htons(length); | |
3743 | resp.response_seq = htonl(sn); | |
3744 | resp.result = htonl(result); | |
3745 | ||
3746 | sctp_addto_chunk(retval, sizeof(resp), &resp); | |
3747 | ||
3748 | return retval; | |
3749 | } | |
3750 | ||
3751 | /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) | |
3752 | * 0 1 2 3 | |
3753 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3754 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3755 | * | Parameter Type = 16 | Parameter Length | | |
3756 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3757 | * | Re-configuration Response Sequence Number | | |
3758 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3759 | * | Result | | |
3760 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3761 | * | Sender's Next TSN (optional) | | |
3762 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3763 | * | Receiver's Next TSN (optional) | | |
3764 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3765 | */ | |
3766 | struct sctp_chunk *sctp_make_strreset_tsnresp( | |
3767 | struct sctp_association *asoc, | |
3768 | __u32 result, __u32 sn, | |
3769 | __u32 sender_tsn, __u32 receiver_tsn) | |
3770 | { | |
3771 | struct sctp_strreset_resptsn tsnresp; | |
3772 | __u16 length = sizeof(tsnresp); | |
3773 | struct sctp_chunk *retval; | |
3774 | ||
3775 | retval = sctp_make_reconf(asoc, length); | |
3776 | if (!retval) | |
3777 | return NULL; | |
3778 | ||
3779 | tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3780 | tsnresp.param_hdr.length = htons(length); | |
3781 | ||
3782 | tsnresp.response_seq = htonl(sn); | |
3783 | tsnresp.result = htonl(result); | |
3784 | tsnresp.senders_next_tsn = htonl(sender_tsn); | |
3785 | tsnresp.receivers_next_tsn = htonl(receiver_tsn); | |
3786 | ||
3787 | sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); | |
3788 | ||
3789 | return retval; | |
3790 | } | |
ea625043 XL |
3791 | |
3792 | bool sctp_verify_reconf(const struct sctp_association *asoc, | |
3793 | struct sctp_chunk *chunk, | |
3794 | struct sctp_paramhdr **errp) | |
3795 | { | |
3796 | struct sctp_reconf_chunk *hdr; | |
3797 | union sctp_params param; | |
3798 | __u16 last = 0, cnt = 0; | |
3799 | ||
3800 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3801 | sctp_walk_params(param, hdr, params) { | |
3802 | __u16 length = ntohs(param.p->length); | |
3803 | ||
3804 | *errp = param.p; | |
3805 | if (cnt++ > 2) | |
3806 | return false; | |
3807 | switch (param.p->type) { | |
3808 | case SCTP_PARAM_RESET_OUT_REQUEST: | |
3809 | if (length < sizeof(struct sctp_strreset_outreq) || | |
3810 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3811 | last != SCTP_PARAM_RESET_IN_REQUEST)) | |
3812 | return false; | |
3813 | break; | |
3814 | case SCTP_PARAM_RESET_IN_REQUEST: | |
3815 | if (length < sizeof(struct sctp_strreset_inreq) || | |
3816 | (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3817 | return false; | |
3818 | break; | |
3819 | case SCTP_PARAM_RESET_RESPONSE: | |
3820 | if ((length != sizeof(struct sctp_strreset_resp) && | |
3821 | length != sizeof(struct sctp_strreset_resptsn)) || | |
3822 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3823 | last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3824 | return false; | |
3825 | break; | |
3826 | case SCTP_PARAM_RESET_TSN_REQUEST: | |
3827 | if (length != | |
3828 | sizeof(struct sctp_strreset_tsnreq) || last) | |
3829 | return false; | |
3830 | break; | |
3831 | case SCTP_PARAM_RESET_ADD_IN_STREAMS: | |
3832 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3833 | (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) | |
3834 | return false; | |
3835 | break; | |
3836 | case SCTP_PARAM_RESET_ADD_OUT_STREAMS: | |
3837 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3838 | (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) | |
3839 | return false; | |
3840 | break; | |
3841 | default: | |
3842 | return false; | |
3843 | } | |
3844 | ||
3845 | last = param.p->type; | |
3846 | } | |
3847 | ||
3848 | return true; | |
3849 | } |