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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 | |
26 | * along with GNU CC; see the file COPYING. If not, write to | |
27 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
28 | * Boston, MA 02111-1307, USA. | |
29 | * | |
30 | * Please send any bug reports or fixes you make to the | |
31 | * email address(es): | |
32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
33 | * | |
34 | * Or submit a bug report through the following website: | |
35 | * http://www.sf.net/projects/lksctp | |
36 | * | |
37 | * Written or modified by: | |
38 | * La Monte H.P. Yarroll <piggy@acm.org> | |
39 | * Karl Knutson <karl@athena.chicago.il.us> | |
40 | * C. Robin <chris@hundredacre.ac.uk> | |
41 | * Jon Grimm <jgrimm@us.ibm.com> | |
42 | * Xingang Guo <xingang.guo@intel.com> | |
43 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
44 | * Sridhar Samudrala <sri@us.ibm.com> | |
45 | * Daisy Chang <daisyc@us.ibm.com> | |
46 | * Ardelle Fan <ardelle.fan@intel.com> | |
47 | * Kevin Gao <kevin.gao@intel.com> | |
48 | * | |
49 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
50 | * be incorporated into the next SCTP release. | |
51 | */ | |
52 | ||
53 | #include <linux/types.h> | |
54 | #include <linux/kernel.h> | |
55 | #include <linux/ip.h> | |
56 | #include <linux/ipv6.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/inet.h> | |
ebc3bbcf | 59 | #include <linux/scatterlist.h> |
1da177e4 LT |
60 | #include <linux/crypto.h> |
61 | #include <net/sock.h> | |
62 | ||
63 | #include <linux/skbuff.h> | |
64 | #include <linux/random.h> /* for get_random_bytes */ | |
65 | #include <net/sctp/sctp.h> | |
66 | #include <net/sctp/sm.h> | |
67 | ||
1da177e4 LT |
68 | SCTP_STATIC |
69 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, | |
70 | __u8 type, __u8 flags, int paylen); | |
71 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
72 | const struct sctp_association *asoc, | |
73 | const struct sctp_chunk *init_chunk, | |
74 | int *cookie_len, | |
75 | const __u8 *raw_addrs, int addrs_len); | |
76 | static int sctp_process_param(struct sctp_association *asoc, | |
77 | union sctp_params param, | |
78 | const union sctp_addr *peer_addr, | |
dd0fc66f | 79 | gfp_t gfp); |
8ee4be37 VY |
80 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
81 | const void *data); | |
1da177e4 LT |
82 | |
83 | /* What was the inbound interface for this chunk? */ | |
84 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
85 | { | |
86 | struct sctp_af *af; | |
87 | int iif = 0; | |
88 | ||
eddc9ec5 | 89 | af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); |
1da177e4 LT |
90 | if (af) |
91 | iif = af->skb_iif(chunk->skb); | |
92 | ||
93 | return iif; | |
94 | } | |
95 | ||
96 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
97 | * | |
98 | * Note 2: The ECN capable field is reserved for future use of | |
99 | * Explicit Congestion Notification. | |
100 | */ | |
101 | static const struct sctp_paramhdr ecap_param = { | |
102 | SCTP_PARAM_ECN_CAPABLE, | |
103 | __constant_htons(sizeof(struct sctp_paramhdr)), | |
104 | }; | |
105 | static const struct sctp_paramhdr prsctp_param = { | |
106 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
107 | __constant_htons(sizeof(struct sctp_paramhdr)), | |
108 | }; | |
109 | ||
110 | /* A helper to initialize to initialize an op error inside a | |
111 | * provided chunk, as most cause codes will be embedded inside an | |
112 | * abort chunk. | |
113 | */ | |
5bf2db03 | 114 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
00f1c2df | 115 | size_t paylen) |
1da177e4 LT |
116 | { |
117 | sctp_errhdr_t err; | |
1da177e4 LT |
118 | __u16 len; |
119 | ||
d808ad9a | 120 | /* Cause code constants are now defined in network order. */ |
1da177e4 LT |
121 | err.cause = cause_code; |
122 | len = sizeof(sctp_errhdr_t) + paylen; | |
1da177e4 | 123 | err.length = htons(len); |
4a1c0107 | 124 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); |
1da177e4 LT |
125 | } |
126 | ||
127 | /* 3.3.2 Initiation (INIT) (1) | |
128 | * | |
129 | * This chunk is used to initiate a SCTP association between two | |
130 | * endpoints. The format of the INIT chunk is shown below: | |
131 | * | |
132 | * 0 1 2 3 | |
133 | * 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 | |
134 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
135 | * | Type = 1 | Chunk Flags | Chunk Length | | |
136 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
137 | * | Initiate Tag | | |
138 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
139 | * | Advertised Receiver Window Credit (a_rwnd) | | |
140 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
141 | * | Number of Outbound Streams | Number of Inbound Streams | | |
142 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
143 | * | Initial TSN | | |
144 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
145 | * \ \ | |
146 | * / Optional/Variable-Length Parameters / | |
147 | * \ \ | |
148 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
149 | * | |
150 | * | |
151 | * The INIT chunk contains the following parameters. Unless otherwise | |
152 | * noted, each parameter MUST only be included once in the INIT chunk. | |
153 | * | |
154 | * Fixed Parameters Status | |
155 | * ---------------------------------------------- | |
156 | * Initiate Tag Mandatory | |
157 | * Advertised Receiver Window Credit Mandatory | |
158 | * Number of Outbound Streams Mandatory | |
159 | * Number of Inbound Streams Mandatory | |
160 | * Initial TSN Mandatory | |
161 | * | |
162 | * Variable Parameters Status Type Value | |
163 | * ------------------------------------------------------------- | |
164 | * IPv4 Address (Note 1) Optional 5 | |
165 | * IPv6 Address (Note 1) Optional 6 | |
166 | * Cookie Preservative Optional 9 | |
167 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
168 | * Host Name Address (Note 3) Optional 11 | |
169 | * Supported Address Types (Note 4) Optional 12 | |
170 | */ | |
171 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
172 | const struct sctp_bind_addr *bp, | |
dd0fc66f | 173 | gfp_t gfp, int vparam_len) |
1da177e4 LT |
174 | { |
175 | sctp_inithdr_t init; | |
176 | union sctp_params addrs; | |
177 | size_t chunksize; | |
178 | struct sctp_chunk *retval = NULL; | |
179 | int num_types, addrs_len = 0; | |
180 | struct sctp_sock *sp; | |
181 | sctp_supported_addrs_param_t sat; | |
3dbe8656 | 182 | __be16 types[2]; |
0f3fffd8 | 183 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
184 | sctp_supported_ext_param_t ext_param; |
185 | int num_ext = 0; | |
186 | __u8 extensions[3]; | |
730fc3d0 VY |
187 | sctp_paramhdr_t *auth_chunks = NULL, |
188 | *auth_hmacs = NULL; | |
1da177e4 LT |
189 | |
190 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
191 | * | |
192 | * Note 1: The INIT chunks can contain multiple addresses that | |
193 | * can be IPv4 and/or IPv6 in any combination. | |
194 | */ | |
195 | retval = NULL; | |
196 | ||
197 | /* Convert the provided bind address list to raw format. */ | |
198 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
199 | ||
200 | init.init_tag = htonl(asoc->c.my_vtag); | |
201 | init.a_rwnd = htonl(asoc->rwnd); | |
202 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
203 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
204 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
205 | ||
206 | /* How many address types are needed? */ | |
207 | sp = sctp_sk(asoc->base.sk); | |
208 | num_types = sp->pf->supported_addrs(sp, types); | |
209 | ||
210 | chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); | |
211 | chunksize += sizeof(ecap_param); | |
8ee4be37 | 212 | |
036b579b VY |
213 | if (sctp_prsctp_enable) |
214 | chunksize += sizeof(prsctp_param); | |
215 | ||
131a47e3 VY |
216 | /* ADDIP: Section 4.2.7: |
217 | * An implementation supporting this extension [ADDIP] MUST list | |
218 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
219 | * INIT-ACK parameters. | |
131a47e3 VY |
220 | */ |
221 | if (sctp_addip_enable) { | |
222 | extensions[num_ext] = SCTP_CID_ASCONF; | |
223 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
224 | num_ext += 2; | |
225 | } | |
226 | ||
1da177e4 LT |
227 | chunksize += sizeof(aiparam); |
228 | chunksize += vparam_len; | |
229 | ||
730fc3d0 VY |
230 | /* Account for AUTH related parameters */ |
231 | if (sctp_auth_enable) { | |
232 | /* Add random parameter length*/ | |
233 | chunksize += sizeof(asoc->c.auth_random); | |
234 | ||
235 | /* Add HMACS parameter length if any were defined */ | |
236 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
237 | if (auth_hmacs->length) | |
238 | chunksize += ntohs(auth_hmacs->length); | |
239 | else | |
240 | auth_hmacs = NULL; | |
241 | ||
242 | /* Add CHUNKS parameter length */ | |
243 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
244 | if (auth_chunks->length) | |
245 | chunksize += ntohs(auth_chunks->length); | |
246 | else | |
9baffaa6 | 247 | auth_chunks = NULL; |
730fc3d0 VY |
248 | |
249 | extensions[num_ext] = SCTP_CID_AUTH; | |
250 | num_ext += 1; | |
251 | } | |
252 | ||
131a47e3 VY |
253 | /* If we have any extensions to report, account for that */ |
254 | if (num_ext) | |
255 | chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; | |
256 | ||
1da177e4 LT |
257 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
258 | * | |
259 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
260 | * Name address parameter. Moreover, the sender of the INIT | |
261 | * MUST NOT combine any other address types with the Host Name | |
262 | * address in the INIT. The receiver of INIT MUST ignore any | |
263 | * other address types if the Host Name address parameter is | |
264 | * present in the received INIT chunk. | |
265 | * | |
266 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
267 | */ | |
268 | ||
269 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); | |
270 | if (!retval) | |
271 | goto nodata; | |
272 | ||
273 | retval->subh.init_hdr = | |
274 | sctp_addto_chunk(retval, sizeof(init), &init); | |
275 | retval->param_hdr.v = | |
276 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
277 | ||
278 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
279 | * | |
280 | * Note 4: This parameter, when present, specifies all the | |
281 | * address types the sending endpoint can support. The absence | |
282 | * of this parameter indicates that the sending endpoint can | |
283 | * support any address type. | |
284 | */ | |
285 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
286 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
287 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
288 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
289 | ||
290 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 291 | |
7aa1b54b | 292 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
293 | * fist before addiding the parameters for the extensions themselves |
294 | */ | |
295 | if (num_ext) { | |
296 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
297 | ext_param.param_hdr.length = | |
298 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
299 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
300 | &ext_param); | |
8ee4be37 | 301 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
302 | } |
303 | ||
1da177e4 LT |
304 | if (sctp_prsctp_enable) |
305 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
131a47e3 | 306 | |
0f3fffd8 | 307 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; |
1da177e4 | 308 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
0f3fffd8 | 309 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); |
1da177e4 | 310 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
131a47e3 | 311 | |
730fc3d0 VY |
312 | /* Add SCTP-AUTH chunks to the parameter list */ |
313 | if (sctp_auth_enable) { | |
314 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), | |
315 | asoc->c.auth_random); | |
316 | if (auth_hmacs) | |
317 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
318 | auth_hmacs); | |
319 | if (auth_chunks) | |
320 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
321 | auth_chunks); | |
322 | } | |
1da177e4 | 323 | nodata: |
a51482bd | 324 | kfree(addrs.v); |
1da177e4 LT |
325 | return retval; |
326 | } | |
327 | ||
328 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
329 | const struct sctp_chunk *chunk, | |
dd0fc66f | 330 | gfp_t gfp, int unkparam_len) |
1da177e4 LT |
331 | { |
332 | sctp_inithdr_t initack; | |
333 | struct sctp_chunk *retval; | |
334 | union sctp_params addrs; | |
335 | int addrs_len; | |
336 | sctp_cookie_param_t *cookie; | |
337 | int cookie_len; | |
338 | size_t chunksize; | |
0f3fffd8 | 339 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
340 | sctp_supported_ext_param_t ext_param; |
341 | int num_ext = 0; | |
342 | __u8 extensions[3]; | |
730fc3d0 VY |
343 | sctp_paramhdr_t *auth_chunks = NULL, |
344 | *auth_hmacs = NULL, | |
345 | *auth_random = NULL; | |
1da177e4 LT |
346 | |
347 | retval = NULL; | |
348 | ||
349 | /* Note: there may be no addresses to embed. */ | |
350 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
351 | ||
352 | initack.init_tag = htonl(asoc->c.my_vtag); | |
353 | initack.a_rwnd = htonl(asoc->rwnd); | |
354 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
355 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
356 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
357 | ||
358 | /* FIXME: We really ought to build the cookie right | |
359 | * into the packet instead of allocating more fresh memory. | |
360 | */ | |
361 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
362 | addrs.v, addrs_len); | |
363 | if (!cookie) | |
364 | goto nomem_cookie; | |
365 | ||
366 | /* Calculate the total size of allocation, include the reserved | |
367 | * space for reporting unknown parameters if it is specified. | |
368 | */ | |
369 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; | |
370 | ||
d808ad9a | 371 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
372 | if (asoc->peer.ecn_capable) |
373 | chunksize += sizeof(ecap_param); | |
374 | ||
036b579b VY |
375 | if (sctp_prsctp_enable) |
376 | chunksize += sizeof(prsctp_param); | |
377 | ||
131a47e3 VY |
378 | if (sctp_addip_enable) { |
379 | extensions[num_ext] = SCTP_CID_ASCONF; | |
380 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
381 | num_ext += 2; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | chunksize += sizeof(aiparam); |
385 | ||
730fc3d0 VY |
386 | if (asoc->peer.auth_capable) { |
387 | auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; | |
388 | chunksize += ntohs(auth_random->length); | |
389 | ||
390 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
391 | if (auth_hmacs->length) | |
392 | chunksize += ntohs(auth_hmacs->length); | |
393 | else | |
394 | auth_hmacs = NULL; | |
395 | ||
396 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
397 | if (auth_chunks->length) | |
398 | chunksize += ntohs(auth_chunks->length); | |
399 | else | |
400 | auth_chunks = NULL; | |
401 | ||
402 | extensions[num_ext] = SCTP_CID_AUTH; | |
403 | num_ext += 1; | |
404 | } | |
405 | ||
8ee4be37 VY |
406 | if (num_ext) |
407 | chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; | |
408 | ||
1da177e4 LT |
409 | /* Now allocate and fill out the chunk. */ |
410 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); | |
411 | if (!retval) | |
412 | goto nomem_chunk; | |
413 | ||
414 | /* Per the advice in RFC 2960 6.4, send this reply to | |
415 | * the source of the INIT packet. | |
416 | */ | |
417 | retval->transport = chunk->transport; | |
418 | retval->subh.init_hdr = | |
419 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
420 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
421 | sctp_addto_chunk(retval, cookie_len, cookie); | |
422 | if (asoc->peer.ecn_capable) | |
423 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
424 | if (num_ext) { |
425 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
426 | ext_param.param_hdr.length = | |
427 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
428 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
429 | &ext_param); | |
8ee4be37 | 430 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 431 | } |
1da177e4 LT |
432 | if (asoc->peer.prsctp_capable) |
433 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
434 | ||
0f3fffd8 | 435 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; |
1da177e4 | 436 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
0f3fffd8 | 437 | aiparam.adaptation_ind = htonl(sctp_sk(asoc->base.sk)->adaptation_ind); |
1da177e4 LT |
438 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
439 | ||
730fc3d0 VY |
440 | if (asoc->peer.auth_capable) { |
441 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
442 | auth_random); | |
443 | if (auth_hmacs) | |
444 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
445 | auth_hmacs); | |
446 | if (auth_chunks) | |
447 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
448 | auth_chunks); | |
449 | } | |
450 | ||
1da177e4 LT |
451 | /* We need to remove the const qualifier at this point. */ |
452 | retval->asoc = (struct sctp_association *) asoc; | |
453 | ||
454 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
455 | * | |
456 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
457 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
458 | * address from which it received the DATA or control chunk | |
459 | * to which it is replying. | |
460 | * | |
461 | * [INIT ACK back to where the INIT came from.] | |
462 | */ | |
463 | if (chunk) | |
464 | retval->transport = chunk->transport; | |
465 | ||
466 | nomem_chunk: | |
467 | kfree(cookie); | |
468 | nomem_cookie: | |
a51482bd | 469 | kfree(addrs.v); |
1da177e4 LT |
470 | return retval; |
471 | } | |
472 | ||
473 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
474 | * | |
475 | * This chunk is used only during the initialization of an association. | |
476 | * It is sent by the initiator of an association to its peer to complete | |
477 | * the initialization process. This chunk MUST precede any DATA chunk | |
478 | * sent within the association, but MAY be bundled with one or more DATA | |
479 | * chunks in the same packet. | |
480 | * | |
481 | * 0 1 2 3 | |
482 | * 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 | |
483 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
484 | * | Type = 10 |Chunk Flags | Length | | |
485 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
486 | * / Cookie / | |
487 | * \ \ | |
488 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
489 | * | |
490 | * Chunk Flags: 8 bit | |
491 | * | |
492 | * Set to zero on transmit and ignored on receipt. | |
493 | * | |
494 | * Length: 16 bits (unsigned integer) | |
495 | * | |
496 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
497 | * the chunk header and the size of the Cookie. | |
498 | * | |
499 | * Cookie: variable size | |
500 | * | |
501 | * This field must contain the exact cookie received in the | |
502 | * State Cookie parameter from the previous INIT ACK. | |
503 | * | |
504 | * An implementation SHOULD make the cookie as small as possible | |
505 | * to insure interoperability. | |
506 | */ | |
507 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
508 | const struct sctp_chunk *chunk) | |
509 | { | |
510 | struct sctp_chunk *retval; | |
511 | void *cookie; | |
512 | int cookie_len; | |
513 | ||
514 | cookie = asoc->peer.cookie; | |
515 | cookie_len = asoc->peer.cookie_len; | |
516 | ||
517 | /* Build a cookie echo chunk. */ | |
518 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); | |
519 | if (!retval) | |
520 | goto nodata; | |
521 | retval->subh.cookie_hdr = | |
522 | sctp_addto_chunk(retval, cookie_len, cookie); | |
523 | ||
524 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
525 | * | |
526 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
527 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
528 | * address from which it * received the DATA or control chunk | |
529 | * to which it is replying. | |
530 | * | |
531 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
532 | */ | |
533 | if (chunk) | |
534 | retval->transport = chunk->transport; | |
535 | ||
536 | nodata: | |
537 | return retval; | |
538 | } | |
539 | ||
540 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
541 | * | |
542 | * This chunk is used only during the initialization of an | |
543 | * association. It is used to acknowledge the receipt of a COOKIE | |
544 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
545 | * within the association, but MAY be bundled with one or more DATA | |
546 | * chunks or SACK chunk in the same SCTP packet. | |
547 | * | |
548 | * 0 1 2 3 | |
549 | * 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 | |
550 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
551 | * | Type = 11 |Chunk Flags | Length = 4 | | |
552 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
553 | * | |
554 | * Chunk Flags: 8 bits | |
555 | * | |
556 | * Set to zero on transmit and ignored on receipt. | |
557 | */ | |
558 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
559 | const struct sctp_chunk *chunk) | |
560 | { | |
561 | struct sctp_chunk *retval; | |
562 | ||
563 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); | |
564 | ||
565 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
566 | * | |
567 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
568 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
569 | * address from which it * received the DATA or control chunk | |
570 | * to which it is replying. | |
571 | * | |
572 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
573 | */ | |
574 | if (retval && chunk) | |
575 | retval->transport = chunk->transport; | |
576 | ||
577 | return retval; | |
578 | } | |
579 | ||
580 | /* | |
581 | * Appendix A: Explicit Congestion Notification: | |
582 | * CWR: | |
583 | * | |
584 | * RFC 2481 details a specific bit for a sender to send in the header of | |
585 | * its next outbound TCP segment to indicate to its peer that it has | |
586 | * reduced its congestion window. This is termed the CWR bit. For | |
587 | * SCTP the same indication is made by including the CWR chunk. | |
588 | * This chunk contains one data element, i.e. the TSN number that | |
589 | * was sent in the ECNE chunk. This element represents the lowest | |
590 | * TSN number in the datagram that was originally marked with the | |
591 | * CE bit. | |
592 | * | |
593 | * 0 1 2 3 | |
594 | * 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 | |
595 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
596 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
597 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
598 | * | Lowest TSN Number | | |
599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
600 | * | |
601 | * Note: The CWR is considered a Control chunk. | |
602 | */ | |
603 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
604 | const __u32 lowest_tsn, | |
605 | const struct sctp_chunk *chunk) | |
606 | { | |
607 | struct sctp_chunk *retval; | |
608 | sctp_cwrhdr_t cwr; | |
609 | ||
610 | cwr.lowest_tsn = htonl(lowest_tsn); | |
611 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, | |
612 | sizeof(sctp_cwrhdr_t)); | |
613 | ||
614 | if (!retval) | |
615 | goto nodata; | |
616 | ||
617 | retval->subh.ecn_cwr_hdr = | |
618 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
619 | ||
620 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
621 | * | |
622 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
623 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
624 | * address from which it * received the DATA or control chunk | |
625 | * to which it is replying. | |
626 | * | |
627 | * [Report a reduced congestion window back to where the ECNE | |
628 | * came from.] | |
629 | */ | |
630 | if (chunk) | |
631 | retval->transport = chunk->transport; | |
632 | ||
633 | nodata: | |
634 | return retval; | |
635 | } | |
636 | ||
637 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
638 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
639 | const __u32 lowest_tsn) | |
640 | { | |
641 | struct sctp_chunk *retval; | |
642 | sctp_ecnehdr_t ecne; | |
643 | ||
644 | ecne.lowest_tsn = htonl(lowest_tsn); | |
645 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, | |
646 | sizeof(sctp_ecnehdr_t)); | |
647 | if (!retval) | |
648 | goto nodata; | |
649 | retval->subh.ecne_hdr = | |
650 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
651 | ||
652 | nodata: | |
653 | return retval; | |
654 | } | |
655 | ||
656 | /* Make a DATA chunk for the given association from the provided | |
657 | * parameters. However, do not populate the data payload. | |
658 | */ | |
659 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, | |
660 | const struct sctp_sndrcvinfo *sinfo, | |
661 | int data_len, __u8 flags, __u16 ssn) | |
662 | { | |
663 | struct sctp_chunk *retval; | |
664 | struct sctp_datahdr dp; | |
665 | int chunk_len; | |
666 | ||
667 | /* We assign the TSN as LATE as possible, not here when | |
668 | * creating the chunk. | |
669 | */ | |
670 | dp.tsn = 0; | |
671 | dp.stream = htons(sinfo->sinfo_stream); | |
672 | dp.ppid = sinfo->sinfo_ppid; | |
673 | ||
674 | /* Set the flags for an unordered send. */ | |
eaa5c54d | 675 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
1da177e4 LT |
676 | flags |= SCTP_DATA_UNORDERED; |
677 | dp.ssn = 0; | |
678 | } else | |
679 | dp.ssn = htons(ssn); | |
680 | ||
681 | chunk_len = sizeof(dp) + data_len; | |
682 | retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); | |
683 | if (!retval) | |
684 | goto nodata; | |
685 | ||
686 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
687 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
688 | ||
689 | nodata: | |
690 | return retval; | |
691 | } | |
692 | ||
693 | /* Create a selective ackowledgement (SACK) for the given | |
694 | * association. This reports on which TSN's we've seen to date, | |
695 | * including duplicates and gaps. | |
696 | */ | |
697 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) | |
698 | { | |
699 | struct sctp_chunk *retval; | |
700 | struct sctp_sackhdr sack; | |
701 | int len; | |
702 | __u32 ctsn; | |
703 | __u16 num_gabs, num_dup_tsns; | |
704 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; | |
705 | ||
706 | ctsn = sctp_tsnmap_get_ctsn(map); | |
707 | SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); | |
708 | ||
709 | /* How much room is needed in the chunk? */ | |
710 | num_gabs = sctp_tsnmap_num_gabs(map); | |
711 | num_dup_tsns = sctp_tsnmap_num_dups(map); | |
712 | ||
713 | /* Initialize the SACK header. */ | |
714 | sack.cum_tsn_ack = htonl(ctsn); | |
715 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
716 | sack.num_gap_ack_blocks = htons(num_gabs); | |
717 | sack.num_dup_tsns = htons(num_dup_tsns); | |
718 | ||
719 | len = sizeof(sack) | |
720 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
721 | + sizeof(__u32) * num_dup_tsns; | |
722 | ||
723 | /* Create the chunk. */ | |
724 | retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); | |
725 | if (!retval) | |
726 | goto nodata; | |
727 | ||
728 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
729 | * | |
730 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
731 | * HEARTBEAT ACK, etc.) to the same destination transport | |
732 | * address from which it received the DATA or control chunk to | |
733 | * which it is replying. This rule should also be followed if | |
734 | * the endpoint is bundling DATA chunks together with the | |
735 | * reply chunk. | |
736 | * | |
737 | * However, when acknowledging multiple DATA chunks received | |
738 | * in packets from different source addresses in a single | |
739 | * SACK, the SACK chunk may be transmitted to one of the | |
740 | * destination transport addresses from which the DATA or | |
741 | * control chunks being acknowledged were received. | |
742 | * | |
743 | * [BUG: We do not implement the following paragraph. | |
744 | * Perhaps we should remember the last transport we used for a | |
745 | * SACK and avoid that (if possible) if we have seen any | |
746 | * duplicates. --piggy] | |
747 | * | |
748 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
749 | * multi- homed endpoint it MAY be beneficial to vary the | |
750 | * destination address and not use the source address of the | |
751 | * DATA chunk. The reason being that receiving a duplicate | |
752 | * from a multi-homed endpoint might indicate that the return | |
753 | * path (as specified in the source address of the DATA chunk) | |
754 | * for the SACK is broken. | |
755 | * | |
756 | * [Send to the address from which we last received a DATA chunk.] | |
757 | */ | |
758 | retval->transport = asoc->peer.last_data_from; | |
759 | ||
760 | retval->subh.sack_hdr = | |
761 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
762 | ||
763 | /* Add the gap ack block information. */ | |
764 | if (num_gabs) | |
765 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
766 | sctp_tsnmap_get_gabs(map)); | |
767 | ||
768 | /* Add the duplicate TSN information. */ | |
769 | if (num_dup_tsns) | |
770 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, | |
771 | sctp_tsnmap_get_dups(map)); | |
772 | ||
773 | nodata: | |
774 | return retval; | |
775 | } | |
776 | ||
777 | /* Make a SHUTDOWN chunk. */ | |
778 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
779 | const struct sctp_chunk *chunk) | |
780 | { | |
781 | struct sctp_chunk *retval; | |
782 | sctp_shutdownhdr_t shut; | |
783 | __u32 ctsn; | |
784 | ||
785 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
786 | shut.cum_tsn_ack = htonl(ctsn); | |
787 | ||
788 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, | |
789 | sizeof(sctp_shutdownhdr_t)); | |
790 | if (!retval) | |
791 | goto nodata; | |
792 | ||
793 | retval->subh.shutdown_hdr = | |
794 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
795 | ||
796 | if (chunk) | |
797 | retval->transport = chunk->transport; | |
798 | nodata: | |
799 | return retval; | |
800 | } | |
801 | ||
802 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
803 | const struct sctp_chunk *chunk) | |
804 | { | |
805 | struct sctp_chunk *retval; | |
806 | ||
807 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); | |
808 | ||
809 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
810 | * | |
811 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
812 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
813 | * address from which it * received the DATA or control chunk | |
814 | * to which it is replying. | |
815 | * | |
816 | * [ACK back to where the SHUTDOWN came from.] | |
817 | */ | |
818 | if (retval && chunk) | |
819 | retval->transport = chunk->transport; | |
820 | ||
821 | return retval; | |
822 | } | |
823 | ||
824 | struct sctp_chunk *sctp_make_shutdown_complete( | |
825 | const struct sctp_association *asoc, | |
826 | const struct sctp_chunk *chunk) | |
827 | { | |
828 | struct sctp_chunk *retval; | |
829 | __u8 flags = 0; | |
830 | ||
047a2428 JF |
831 | /* Set the T-bit if we have no association (vtag will be |
832 | * reflected) | |
833 | */ | |
1da177e4 LT |
834 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
835 | ||
836 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); | |
837 | ||
838 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
839 | * | |
840 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
841 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
842 | * address from which it * received the DATA or control chunk | |
843 | * to which it is replying. | |
844 | * | |
845 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
846 | * came from.] | |
847 | */ | |
848 | if (retval && chunk) | |
849 | retval->transport = chunk->transport; | |
850 | ||
d808ad9a | 851 | return retval; |
1da177e4 LT |
852 | } |
853 | ||
854 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 855 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
856 | */ |
857 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
858 | const struct sctp_chunk *chunk, | |
859 | const size_t hint) | |
860 | { | |
861 | struct sctp_chunk *retval; | |
862 | __u8 flags = 0; | |
863 | ||
047a2428 JF |
864 | /* Set the T-bit if we have no association and 'chunk' is not |
865 | * an INIT (vtag will be reflected). | |
866 | */ | |
867 | if (!asoc) { | |
868 | if (chunk && chunk->chunk_hdr && | |
869 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
870 | flags = 0; | |
871 | else | |
872 | flags = SCTP_CHUNK_FLAG_T; | |
873 | } | |
1da177e4 LT |
874 | |
875 | retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); | |
876 | ||
877 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
878 | * | |
879 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
880 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
881 | * address from which it * received the DATA or control chunk | |
882 | * to which it is replying. | |
883 | * | |
884 | * [ABORT back to where the offender came from.] | |
885 | */ | |
886 | if (retval && chunk) | |
887 | retval->transport = chunk->transport; | |
888 | ||
889 | return retval; | |
890 | } | |
891 | ||
892 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
893 | struct sctp_chunk *sctp_make_abort_no_data( | |
894 | const struct sctp_association *asoc, | |
895 | const struct sctp_chunk *chunk, __u32 tsn) | |
896 | { | |
897 | struct sctp_chunk *retval; | |
9f81bcd9 | 898 | __be32 payload; |
1da177e4 LT |
899 | |
900 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) | |
901 | + sizeof(tsn)); | |
902 | ||
903 | if (!retval) | |
904 | goto no_mem; | |
905 | ||
906 | /* Put the tsn back into network byte order. */ | |
907 | payload = htonl(tsn); | |
00f1c2df WY |
908 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
909 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
910 | |
911 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
912 | * | |
913 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
914 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
915 | * address from which it * received the DATA or control chunk | |
916 | * to which it is replying. | |
917 | * | |
918 | * [ABORT back to where the offender came from.] | |
919 | */ | |
920 | if (chunk) | |
921 | retval->transport = chunk->transport; | |
922 | ||
923 | no_mem: | |
924 | return retval; | |
925 | } | |
926 | ||
927 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
928 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
c164a9ba SS |
929 | const struct msghdr *msg, |
930 | size_t paylen) | |
1da177e4 LT |
931 | { |
932 | struct sctp_chunk *retval; | |
c164a9ba SS |
933 | void *payload = NULL; |
934 | int err; | |
1da177e4 | 935 | |
c164a9ba | 936 | retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); |
1da177e4 LT |
937 | if (!retval) |
938 | goto err_chunk; | |
939 | ||
940 | if (paylen) { | |
941 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 942 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
943 | if (!payload) |
944 | goto err_payload; | |
c164a9ba SS |
945 | |
946 | err = memcpy_fromiovec(payload, msg->msg_iov, paylen); | |
947 | if (err < 0) | |
948 | goto err_copy; | |
1da177e4 LT |
949 | } |
950 | ||
00f1c2df WY |
951 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
952 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
953 | |
954 | if (paylen) | |
955 | kfree(payload); | |
956 | ||
957 | return retval; | |
958 | ||
959 | err_copy: | |
960 | kfree(payload); | |
961 | err_payload: | |
962 | sctp_chunk_free(retval); | |
963 | retval = NULL; | |
964 | err_chunk: | |
965 | return retval; | |
966 | } | |
967 | ||
5c94bf86 AB |
968 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
969 | * enough. | |
970 | */ | |
971 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
972 | const void *data) | |
973 | { | |
974 | void *target; | |
975 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
976 | ||
977 | target = skb_put(chunk->skb, len); | |
978 | ||
979 | memcpy(target, data, len); | |
980 | ||
981 | /* Adjust the chunk length field. */ | |
982 | chunk->chunk_hdr->length = htons(chunklen + len); | |
983 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
984 | ||
985 | return target; | |
986 | } | |
987 | ||
d808ad9a | 988 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 LT |
989 | struct sctp_chunk *sctp_make_abort_violation( |
990 | const struct sctp_association *asoc, | |
991 | const struct sctp_chunk *chunk, | |
992 | const __u8 *payload, | |
993 | const size_t paylen) | |
994 | { | |
995 | struct sctp_chunk *retval; | |
996 | struct sctp_paramhdr phdr; | |
997 | ||
998 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen | |
00f1c2df | 999 | + sizeof(sctp_paramhdr_t)); |
1da177e4 LT |
1000 | if (!retval) |
1001 | goto end; | |
1002 | ||
00f1c2df WY |
1003 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen |
1004 | + sizeof(sctp_paramhdr_t)); | |
1da177e4 LT |
1005 | |
1006 | phdr.type = htons(chunk->chunk_hdr->type); | |
1007 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df WY |
1008 | sctp_addto_chunk(retval, paylen, payload); |
1009 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); | |
1da177e4 LT |
1010 | |
1011 | end: | |
1012 | return retval; | |
1013 | } | |
1014 | ||
1015 | /* Make a HEARTBEAT chunk. */ | |
1016 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
1017 | const struct sctp_transport *transport, | |
1018 | const void *payload, const size_t paylen) | |
1019 | { | |
1020 | struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, | |
1021 | 0, paylen); | |
1022 | ||
1023 | if (!retval) | |
1024 | goto nodata; | |
1025 | ||
1026 | /* Cast away the 'const', as this is just telling the chunk | |
1027 | * what transport it belongs to. | |
1028 | */ | |
1029 | retval->transport = (struct sctp_transport *) transport; | |
1030 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1031 | ||
1032 | nodata: | |
1033 | return retval; | |
1034 | } | |
1035 | ||
1036 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
1037 | const struct sctp_chunk *chunk, | |
1038 | const void *payload, const size_t paylen) | |
1039 | { | |
1040 | struct sctp_chunk *retval; | |
1041 | ||
1042 | retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); | |
1043 | if (!retval) | |
1044 | goto nodata; | |
1045 | ||
1046 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1047 | ||
1048 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1049 | * | |
1050 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1051 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1052 | * address from which it * received the DATA or control chunk | |
1053 | * to which it is replying. | |
1054 | * | |
1055 | * [HBACK back to where the HEARTBEAT came from.] | |
1056 | */ | |
1057 | if (chunk) | |
1058 | retval->transport = chunk->transport; | |
1059 | ||
1060 | nodata: | |
1061 | return retval; | |
1062 | } | |
1063 | ||
1064 | /* Create an Operation Error chunk with the specified space reserved. | |
1065 | * This routine can be used for containing multiple causes in the chunk. | |
1066 | */ | |
1067 | static struct sctp_chunk *sctp_make_op_error_space( | |
1068 | const struct sctp_association *asoc, | |
1069 | const struct sctp_chunk *chunk, | |
1070 | size_t size) | |
1071 | { | |
1072 | struct sctp_chunk *retval; | |
1073 | ||
1074 | retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, | |
1075 | sizeof(sctp_errhdr_t) + size); | |
1076 | if (!retval) | |
1077 | goto nodata; | |
1078 | ||
1079 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1080 | * | |
1081 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1082 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1083 | * address from which it received the DATA or control chunk | |
1084 | * to which it is replying. | |
1085 | * | |
1086 | */ | |
1087 | if (chunk) | |
1088 | retval->transport = chunk->transport; | |
1089 | ||
1090 | nodata: | |
1091 | return retval; | |
1092 | } | |
1093 | ||
1094 | /* Create an Operation Error chunk. */ | |
1095 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
1096 | const struct sctp_chunk *chunk, | |
63706c5c | 1097 | __be16 cause_code, const void *payload, |
1da177e4 LT |
1098 | size_t paylen) |
1099 | { | |
1100 | struct sctp_chunk *retval; | |
1101 | ||
1102 | retval = sctp_make_op_error_space(asoc, chunk, paylen); | |
1103 | if (!retval) | |
1104 | goto nodata; | |
1105 | ||
00f1c2df WY |
1106 | sctp_init_cause(retval, cause_code, paylen); |
1107 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1108 | |
1109 | nodata: | |
1110 | return retval; | |
1111 | } | |
1112 | ||
4cd57c80 VY |
1113 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) |
1114 | { | |
1115 | struct sctp_chunk *retval; | |
1116 | struct sctp_hmac *hmac_desc; | |
1117 | struct sctp_authhdr auth_hdr; | |
1118 | __u8 *hmac; | |
1119 | ||
1120 | /* Get the first hmac that the peer told us to use */ | |
1121 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1122 | if (unlikely(!hmac_desc)) | |
1123 | return NULL; | |
1124 | ||
1125 | retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, | |
1126 | hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); | |
1127 | if (!retval) | |
1128 | return NULL; | |
1129 | ||
1130 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1131 | auth_hdr.shkey_id = htons(asoc->active_key_id); | |
1132 | ||
1133 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), | |
1134 | &auth_hdr); | |
1135 | ||
1136 | hmac = skb_put(retval->skb, hmac_desc->hmac_len); | |
1137 | memset(hmac, 0, hmac_desc->hmac_len); | |
1138 | ||
1139 | /* Adjust the chunk header to include the empty MAC */ | |
1140 | retval->chunk_hdr->length = | |
1141 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1142 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1143 | ||
1144 | return retval; | |
1145 | } | |
1146 | ||
1147 | ||
1da177e4 LT |
1148 | /******************************************************************** |
1149 | * 2nd Level Abstractions | |
1150 | ********************************************************************/ | |
1151 | ||
1152 | /* Turn an skb into a chunk. | |
1153 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
1154 | */ | |
1155 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
1156 | const struct sctp_association *asoc, | |
1157 | struct sock *sk) | |
1158 | { | |
1159 | struct sctp_chunk *retval; | |
1160 | ||
c3762229 | 1161 | retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); |
1da177e4 LT |
1162 | |
1163 | if (!retval) | |
1164 | goto nodata; | |
1da177e4 LT |
1165 | |
1166 | if (!sk) { | |
1167 | SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); | |
1168 | } | |
1169 | ||
79af02c2 | 1170 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1171 | retval->skb = skb; |
1172 | retval->asoc = (struct sctp_association *)asoc; | |
1173 | retval->resent = 0; | |
1174 | retval->has_tsn = 0; | |
1175 | retval->has_ssn = 0; | |
1176 | retval->rtt_in_progress = 0; | |
1177 | retval->sent_at = 0; | |
1178 | retval->singleton = 1; | |
1179 | retval->end_of_packet = 0; | |
1180 | retval->ecn_ce_done = 0; | |
1181 | retval->pdiscard = 0; | |
1182 | ||
1183 | /* sctpimpguide-05.txt Section 2.8.2 | |
1184 | * M1) Each time a new DATA chunk is transmitted | |
1185 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1186 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1187 | * and when to fast retransmit. | |
1188 | */ | |
1189 | retval->tsn_missing_report = 0; | |
1190 | retval->tsn_gap_acked = 0; | |
1191 | retval->fast_retransmit = 0; | |
1192 | ||
1193 | /* If this is a fragmented message, track all fragments | |
1194 | * of the message (for SEND_FAILED). | |
1195 | */ | |
1196 | retval->msg = NULL; | |
1197 | ||
1198 | /* Polish the bead hole. */ | |
1199 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1200 | INIT_LIST_HEAD(&retval->frag_list); | |
1201 | SCTP_DBG_OBJCNT_INC(chunk); | |
1202 | atomic_set(&retval->refcnt, 1); | |
1203 | ||
1204 | nodata: | |
1205 | return retval; | |
1206 | } | |
1207 | ||
1208 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1209 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1210 | union sctp_addr *dest) | |
1211 | { | |
f235fca3 | 1212 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1213 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | /* Extract the source address from a chunk. */ | |
1217 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1218 | { | |
1219 | /* If we have a known transport, use that. */ | |
1220 | if (chunk->transport) { | |
6a1e5f33 | 1221 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1222 | } else { |
1223 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1224 | return &chunk->source; |
1da177e4 LT |
1225 | } |
1226 | } | |
1227 | ||
1228 | /* Create a new chunk, setting the type and flags headers from the | |
1229 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1230 | */ | |
1231 | SCTP_STATIC | |
1232 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, | |
1233 | __u8 type, __u8 flags, int paylen) | |
1234 | { | |
1235 | struct sctp_chunk *retval; | |
1236 | sctp_chunkhdr_t *chunk_hdr; | |
1237 | struct sk_buff *skb; | |
1238 | struct sock *sk; | |
1239 | ||
1240 | /* No need to allocate LL here, as this is only a chunk. */ | |
1241 | skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), | |
1242 | GFP_ATOMIC); | |
1243 | if (!skb) | |
1244 | goto nodata; | |
1245 | ||
1246 | /* Make room for the chunk header. */ | |
1247 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); | |
1248 | chunk_hdr->type = type; | |
1249 | chunk_hdr->flags = flags; | |
1250 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); | |
1251 | ||
1252 | sk = asoc ? asoc->base.sk : NULL; | |
1253 | retval = sctp_chunkify(skb, asoc, sk); | |
1254 | if (!retval) { | |
1255 | kfree_skb(skb); | |
1256 | goto nodata; | |
1257 | } | |
1258 | ||
1259 | retval->chunk_hdr = chunk_hdr; | |
1260 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); | |
1261 | ||
4cd57c80 VY |
1262 | /* Determine if the chunk needs to be authenticated */ |
1263 | if (sctp_auth_send_cid(type, asoc)) | |
1264 | retval->auth = 1; | |
1265 | ||
1da177e4 LT |
1266 | /* Set the skb to the belonging sock for accounting. */ |
1267 | skb->sk = sk; | |
1268 | ||
1269 | return retval; | |
1270 | nodata: | |
1271 | return NULL; | |
1272 | } | |
1273 | ||
1274 | ||
1275 | /* Release the memory occupied by a chunk. */ | |
1276 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1277 | { | |
a08de64d VY |
1278 | BUG_ON(!list_empty(&chunk->list)); |
1279 | list_del_init(&chunk->transmitted_list); | |
1280 | ||
1da177e4 LT |
1281 | /* Free the chunk skb data and the SCTP_chunk stub itself. */ |
1282 | dev_kfree_skb(chunk->skb); | |
1283 | ||
1284 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1285 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1286 | } | |
1287 | ||
1288 | /* Possibly, free the chunk. */ | |
1289 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1290 | { | |
1da177e4 LT |
1291 | /* Release our reference on the message tracker. */ |
1292 | if (chunk->msg) | |
1293 | sctp_datamsg_put(chunk->msg); | |
1294 | ||
1295 | sctp_chunk_put(chunk); | |
1296 | } | |
1297 | ||
1298 | /* Grab a reference to the chunk. */ | |
1299 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1300 | { | |
1301 | atomic_inc(&ch->refcnt); | |
1302 | } | |
1303 | ||
1304 | /* Release a reference to the chunk. */ | |
1305 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1306 | { | |
1307 | if (atomic_dec_and_test(&ch->refcnt)) | |
1308 | sctp_chunk_destroy(ch); | |
1309 | } | |
1310 | ||
1311 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1312 | * enough. | |
1313 | */ | |
1314 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1315 | { | |
1316 | void *target; | |
1317 | void *padding; | |
1318 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
8d614ade | 1319 | int padlen = WORD_ROUND(chunklen) - chunklen; |
1da177e4 LT |
1320 | |
1321 | padding = skb_put(chunk->skb, padlen); | |
1322 | target = skb_put(chunk->skb, len); | |
1323 | ||
1324 | memset(padding, 0, padlen); | |
1325 | memcpy(target, data, len); | |
1326 | ||
1327 | /* Adjust the chunk length field. */ | |
1328 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1329 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1330 | |
1331 | return target; | |
1332 | } | |
1333 | ||
1334 | /* Append bytes from user space to the end of a chunk. Will panic if | |
1335 | * chunk is not big enough. | |
1336 | * Returns a kernel err value. | |
1337 | */ | |
1338 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, | |
1339 | struct iovec *data) | |
1340 | { | |
1341 | __u8 *target; | |
1342 | int err = 0; | |
1343 | ||
1344 | /* Make room in chunk for data. */ | |
1345 | target = skb_put(chunk->skb, len); | |
1346 | ||
1347 | /* Copy data (whole iovec) into chunk */ | |
1348 | if ((err = memcpy_fromiovecend(target, data, off, len))) | |
1349 | goto out; | |
1350 | ||
1351 | /* Adjust the chunk length field. */ | |
1352 | chunk->chunk_hdr->length = | |
1353 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1354 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1355 | |
1356 | out: | |
1357 | return err; | |
1358 | } | |
1359 | ||
1360 | /* Helper function to assign a TSN if needed. This assumes that both | |
1361 | * the data_hdr and association have already been assigned. | |
1362 | */ | |
1363 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1364 | { | |
ab3e5e7b VY |
1365 | struct sctp_datamsg *msg; |
1366 | struct sctp_chunk *lchunk; | |
1367 | struct sctp_stream *stream; | |
1da177e4 LT |
1368 | __u16 ssn; |
1369 | __u16 sid; | |
1370 | ||
1371 | if (chunk->has_ssn) | |
1372 | return; | |
1373 | ||
ab3e5e7b VY |
1374 | /* All fragments will be on the same stream */ |
1375 | sid = ntohs(chunk->subh.data_hdr->stream); | |
1376 | stream = &chunk->asoc->ssnmap->out; | |
1da177e4 | 1377 | |
ab3e5e7b VY |
1378 | /* Now assign the sequence number to the entire message. |
1379 | * All fragments must have the same stream sequence number. | |
1380 | */ | |
1381 | msg = chunk->msg; | |
1382 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1383 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1384 | ssn = 0; | |
1385 | } else { | |
1386 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
1387 | ssn = sctp_ssn_next(stream, sid); | |
1388 | else | |
1389 | ssn = sctp_ssn_peek(stream, sid); | |
1390 | } | |
1391 | ||
1392 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1393 | lchunk->has_ssn = 1; | |
1394 | } | |
1da177e4 LT |
1395 | } |
1396 | ||
1397 | /* Helper function to assign a TSN if needed. This assumes that both | |
1398 | * the data_hdr and association have already been assigned. | |
1399 | */ | |
1400 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1401 | { | |
1402 | if (!chunk->has_tsn) { | |
1403 | /* This is the last possible instant to | |
1404 | * assign a TSN. | |
1405 | */ | |
1406 | chunk->subh.data_hdr->tsn = | |
1407 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1408 | chunk->has_tsn = 1; | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | /* Create a CLOSED association to use with an incoming packet. */ | |
1413 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
3182cd84 | 1414 | struct sctp_chunk *chunk, |
dd0fc66f | 1415 | gfp_t gfp) |
1da177e4 LT |
1416 | { |
1417 | struct sctp_association *asoc; | |
1418 | struct sk_buff *skb; | |
1419 | sctp_scope_t scope; | |
1420 | struct sctp_af *af; | |
1421 | ||
1422 | /* Create the bare association. */ | |
1423 | scope = sctp_scope(sctp_source(chunk)); | |
1424 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1425 | if (!asoc) | |
1426 | goto nodata; | |
1427 | asoc->temp = 1; | |
1428 | skb = chunk->skb; | |
1429 | /* Create an entry for the source address of the packet. */ | |
eddc9ec5 | 1430 | af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); |
1da177e4 LT |
1431 | if (unlikely(!af)) |
1432 | goto fail; | |
d55c41b1 | 1433 | af->from_skb(&asoc->c.peer_addr, skb, 1); |
1da177e4 LT |
1434 | nodata: |
1435 | return asoc; | |
1436 | ||
1437 | fail: | |
1438 | sctp_association_free(asoc); | |
1439 | return NULL; | |
1440 | } | |
1441 | ||
1442 | /* Build a cookie representing asoc. | |
1443 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1444 | */ | |
1445 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
1446 | const struct sctp_association *asoc, | |
1447 | const struct sctp_chunk *init_chunk, | |
1448 | int *cookie_len, | |
1449 | const __u8 *raw_addrs, int addrs_len) | |
1450 | { | |
1451 | sctp_cookie_param_t *retval; | |
1452 | struct sctp_signed_cookie *cookie; | |
1453 | struct scatterlist sg; | |
1454 | int headersize, bodysize; | |
1455 | unsigned int keylen; | |
1456 | char *key; | |
1457 | ||
9834a2bb VY |
1458 | /* Header size is static data prior to the actual cookie, including |
1459 | * any padding. | |
1460 | */ | |
d808ad9a YH |
1461 | headersize = sizeof(sctp_paramhdr_t) + |
1462 | (sizeof(struct sctp_signed_cookie) - | |
9834a2bb | 1463 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1464 | bodysize = sizeof(struct sctp_cookie) |
1465 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1466 | ||
1467 | /* Pad out the cookie to a multiple to make the signature | |
1468 | * functions simpler to write. | |
1469 | */ | |
1470 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1471 | bodysize += SCTP_COOKIE_MULTIPLE | |
1472 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1473 | *cookie_len = headersize + bodysize; | |
1474 | ||
1da177e4 LT |
1475 | /* Clear this memory since we are sending this data structure |
1476 | * out on the network. | |
1477 | */ | |
af997d8c ACM |
1478 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1479 | if (!retval) | |
1480 | goto nodata; | |
1481 | ||
1da177e4 LT |
1482 | cookie = (struct sctp_signed_cookie *) retval->body; |
1483 | ||
1484 | /* Set up the parameter header. */ | |
1485 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1486 | retval->p.length = htons(*cookie_len); | |
1487 | ||
1488 | /* Copy the cookie part of the association itself. */ | |
1489 | cookie->c = asoc->c; | |
1490 | /* Save the raw address list length in the cookie. */ | |
1491 | cookie->c.raw_addr_list_len = addrs_len; | |
1492 | ||
1493 | /* Remember PR-SCTP capability. */ | |
1494 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1495 | ||
0f3fffd8 ISJ |
1496 | /* Save adaptation indication in the cookie. */ |
1497 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1498 | |
1499 | /* Set an expiration time for the cookie. */ | |
1500 | do_gettimeofday(&cookie->c.expiration); | |
1501 | TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); | |
1502 | ||
1503 | /* Copy the peer's init packet. */ | |
1504 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1505 | ntohs(init_chunk->chunk_hdr->length)); | |
1506 | ||
1507 | /* Copy the raw local address list of the association. */ | |
1508 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1509 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1510 | ||
d808ad9a | 1511 | if (sctp_sk(ep->base.sk)->hmac) { |
1b489e11 HX |
1512 | struct hash_desc desc; |
1513 | ||
1da177e4 | 1514 | /* Sign the message. */ |
68e3f5dd | 1515 | sg_init_one(&sg, &cookie->c, bodysize); |
1da177e4 LT |
1516 | keylen = SCTP_SECRET_SIZE; |
1517 | key = (char *)ep->secret_key[ep->current_key]; | |
d808ad9a YH |
1518 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
1519 | desc.flags = 0; | |
1da177e4 | 1520 | |
1b489e11 HX |
1521 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1522 | crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) | |
1523 | goto free_cookie; | |
1da177e4 LT |
1524 | } |
1525 | ||
1da177e4 | 1526 | return retval; |
1b489e11 HX |
1527 | |
1528 | free_cookie: | |
1529 | kfree(retval); | |
1530 | nodata: | |
1531 | *cookie_len = 0; | |
1532 | return NULL; | |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1536 | struct sctp_association *sctp_unpack_cookie( | |
1537 | const struct sctp_endpoint *ep, | |
1538 | const struct sctp_association *asoc, | |
dd0fc66f | 1539 | struct sctp_chunk *chunk, gfp_t gfp, |
1da177e4 LT |
1540 | int *error, struct sctp_chunk **errp) |
1541 | { | |
1542 | struct sctp_association *retval = NULL; | |
1543 | struct sctp_signed_cookie *cookie; | |
1544 | struct sctp_cookie *bear_cookie; | |
1545 | int headersize, bodysize, fixed_size; | |
313e7b4d | 1546 | __u8 *digest = ep->digest; |
1da177e4 LT |
1547 | struct scatterlist sg; |
1548 | unsigned int keylen, len; | |
1549 | char *key; | |
1550 | sctp_scope_t scope; | |
1551 | struct sk_buff *skb = chunk->skb; | |
a61bbcf2 | 1552 | struct timeval tv; |
1b489e11 | 1553 | struct hash_desc desc; |
1da177e4 | 1554 | |
9834a2bb VY |
1555 | /* Header size is static data prior to the actual cookie, including |
1556 | * any padding. | |
1557 | */ | |
1558 | headersize = sizeof(sctp_chunkhdr_t) + | |
d808ad9a | 1559 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1560 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1561 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1562 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1563 | ||
1564 | /* Verify that the chunk looks like it even has a cookie. | |
1565 | * There must be enough room for our cookie and our peer's | |
1566 | * INIT chunk. | |
1567 | */ | |
1568 | len = ntohs(chunk->chunk_hdr->length); | |
1569 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1570 | goto malformed; | |
1571 | ||
1572 | /* Verify that the cookie has been padded out. */ | |
1573 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1574 | goto malformed; | |
1575 | ||
1576 | /* Process the cookie. */ | |
1577 | cookie = chunk->subh.cookie_hdr; | |
1578 | bear_cookie = &cookie->c; | |
1579 | ||
1580 | if (!sctp_sk(ep->base.sk)->hmac) | |
1581 | goto no_hmac; | |
1582 | ||
1583 | /* Check the signature. */ | |
1584 | keylen = SCTP_SECRET_SIZE; | |
68e3f5dd | 1585 | sg_init_one(&sg, bear_cookie, bodysize); |
1da177e4 | 1586 | key = (char *)ep->secret_key[ep->current_key]; |
1b489e11 HX |
1587 | desc.tfm = sctp_sk(ep->base.sk)->hmac; |
1588 | desc.flags = 0; | |
1da177e4 | 1589 | |
8ca84481 | 1590 | memset(digest, 0x00, SCTP_SIGNATURE_SIZE); |
1b489e11 HX |
1591 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1592 | crypto_hash_digest(&desc, &sg, bodysize, digest)) { | |
1593 | *error = -SCTP_IERROR_NOMEM; | |
1594 | goto fail; | |
1595 | } | |
1da177e4 LT |
1596 | |
1597 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
1598 | /* Try the previous key. */ | |
1599 | key = (char *)ep->secret_key[ep->last_key]; | |
8ca84481 | 1600 | memset(digest, 0x00, SCTP_SIGNATURE_SIZE); |
1b489e11 HX |
1601 | if (crypto_hash_setkey(desc.tfm, key, keylen) || |
1602 | crypto_hash_digest(&desc, &sg, bodysize, digest)) { | |
1603 | *error = -SCTP_IERROR_NOMEM; | |
1604 | goto fail; | |
1605 | } | |
1da177e4 LT |
1606 | |
1607 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
1608 | /* Yikes! Still bad signature! */ | |
1609 | *error = -SCTP_IERROR_BAD_SIG; | |
1610 | goto fail; | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | no_hmac: | |
1615 | /* IG Section 2.35.2: | |
1616 | * 3) Compare the port numbers and the verification tag contained | |
1617 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1618 | * verification tag within the SCTP common header of the received | |
1619 | * packet. If these values do not match the packet MUST be silently | |
1620 | * discarded, | |
1621 | */ | |
1622 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1623 | *error = -SCTP_IERROR_BAD_TAG; | |
1624 | goto fail; | |
1625 | } | |
1626 | ||
9b1dfad0 | 1627 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1628 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1629 | *error = -SCTP_IERROR_BAD_PORTS; | |
1630 | goto fail; | |
1631 | } | |
1632 | ||
1633 | /* Check to see if the cookie is stale. If there is already | |
1634 | * an association, there is no need to check cookie's expiration | |
1635 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1636 | * If skb has been timestamped, then use the stamp, otherwise |
1637 | * use current time. This introduces a small possibility that | |
1638 | * that a cookie may be considered expired, but his would only slow | |
1639 | * down the new association establishment instead of every packet. | |
1da177e4 | 1640 | */ |
f236218b VY |
1641 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
1642 | skb_get_timestamp(skb, &tv); | |
1643 | else | |
1644 | do_gettimeofday(&tv); | |
1645 | ||
a61bbcf2 | 1646 | if (!asoc && tv_lt(bear_cookie->expiration, tv)) { |
1da177e4 LT |
1647 | /* |
1648 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1649 | * | |
1650 | * Cause of error | |
1651 | * --------------- | |
1652 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1653 | * Cookie that has expired. | |
1654 | */ | |
1655 | len = ntohs(chunk->chunk_hdr->length); | |
1656 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1657 | if (*errp) { | |
a61bbcf2 | 1658 | suseconds_t usecs = (tv.tv_sec - |
1da177e4 | 1659 | bear_cookie->expiration.tv_sec) * 1000000L + |
a61bbcf2 | 1660 | tv.tv_usec - bear_cookie->expiration.tv_usec; |
34bcca28 | 1661 | __be32 n = htonl(usecs); |
1da177e4 | 1662 | |
1da177e4 | 1663 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
00f1c2df WY |
1664 | sizeof(n)); |
1665 | sctp_addto_chunk(*errp, sizeof(n), &n); | |
1da177e4 LT |
1666 | *error = -SCTP_IERROR_STALE_COOKIE; |
1667 | } else | |
1668 | *error = -SCTP_IERROR_NOMEM; | |
1669 | ||
1670 | goto fail; | |
1671 | } | |
1672 | ||
1673 | /* Make a new base association. */ | |
1674 | scope = sctp_scope(sctp_source(chunk)); | |
1675 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1676 | if (!retval) { | |
1677 | *error = -SCTP_IERROR_NOMEM; | |
1678 | goto fail; | |
1679 | } | |
1680 | ||
1681 | /* Set up our peer's port number. */ | |
1682 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1683 | ||
1684 | /* Populate the association from the cookie. */ | |
1685 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1686 | ||
1687 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1688 | GFP_ATOMIC) < 0) { | |
1689 | *error = -SCTP_IERROR_NOMEM; | |
1690 | goto fail; | |
1691 | } | |
1692 | ||
1693 | /* Also, add the destination address. */ | |
1694 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 VY |
1695 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
1696 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
1697 | } |
1698 | ||
1699 | retval->next_tsn = retval->c.initial_tsn; | |
1700 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1701 | retval->addip_serial = retval->c.initial_tsn; | |
1702 | retval->adv_peer_ack_point = retval->ctsn_ack_point; | |
1703 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1704 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1705 | |
1706 | /* The INIT stuff will be done by the side effects. */ | |
1707 | return retval; | |
1708 | ||
1709 | fail: | |
1710 | if (retval) | |
1711 | sctp_association_free(retval); | |
1712 | ||
1713 | return NULL; | |
1714 | ||
1715 | malformed: | |
1716 | /* Yikes! The packet is either corrupt or deliberately | |
1717 | * malformed. | |
1718 | */ | |
1719 | *error = -SCTP_IERROR_MALFORMED; | |
1720 | goto fail; | |
1721 | } | |
1722 | ||
1723 | /******************************************************************** | |
1724 | * 3rd Level Abstractions | |
1725 | ********************************************************************/ | |
1726 | ||
1727 | struct __sctp_missing { | |
9f81bcd9 AV |
1728 | __be32 num_missing; |
1729 | __be16 type; | |
1da177e4 LT |
1730 | } __attribute__((packed)); |
1731 | ||
1732 | /* | |
1733 | * Report a missing mandatory parameter. | |
1734 | */ | |
1735 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
1736 | sctp_param_t paramtype, | |
1737 | struct sctp_chunk *chunk, | |
1738 | struct sctp_chunk **errp) | |
1739 | { | |
1740 | struct __sctp_missing report; | |
1741 | __u16 len; | |
1742 | ||
1743 | len = WORD_ROUND(sizeof(report)); | |
1744 | ||
1745 | /* Make an ERROR chunk, preparing enough room for | |
1746 | * returning multiple unknown parameters. | |
1747 | */ | |
1748 | if (!*errp) | |
1749 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1750 | ||
1751 | if (*errp) { | |
1752 | report.num_missing = htonl(1); | |
1753 | report.type = paramtype; | |
ebdfcad4 | 1754 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1755 | sizeof(report)); |
1756 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1757 | } |
1758 | ||
1759 | /* Stop processing this chunk. */ | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | /* Report an Invalid Mandatory Parameter. */ | |
1764 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1765 | struct sctp_chunk *chunk, | |
1766 | struct sctp_chunk **errp) | |
1767 | { | |
1768 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1769 | ||
1770 | if (!*errp) | |
1771 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1772 | ||
1773 | if (*errp) | |
00f1c2df | 1774 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1775 | |
1776 | /* Stop processing this chunk. */ | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1781 | struct sctp_paramhdr *param, | |
1782 | const struct sctp_chunk *chunk, | |
1783 | struct sctp_chunk **errp) | |
1784 | { | |
1785 | char error[] = "The following parameter had invalid length:"; | |
d808ad9a | 1786 | size_t payload_len = WORD_ROUND(sizeof(error)) + |
1da177e4 LT |
1787 | sizeof(sctp_paramhdr_t); |
1788 | ||
1789 | ||
7ab90804 VY |
1790 | /* This is a fatal error. Any accumulated non-fatal errors are |
1791 | * not reported. | |
1792 | */ | |
1793 | if (*errp) | |
1794 | sctp_chunk_free(*errp); | |
1795 | ||
1da177e4 | 1796 | /* Create an error chunk and fill it in with our payload. */ |
7ab90804 | 1797 | *errp = sctp_make_op_error_space(asoc, chunk, payload_len); |
1da177e4 LT |
1798 | |
1799 | if (*errp) { | |
00f1c2df WY |
1800 | sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, |
1801 | sizeof(error) + sizeof(sctp_paramhdr_t)); | |
1802 | sctp_addto_chunk(*errp, sizeof(error), error); | |
1803 | sctp_addto_param(*errp, sizeof(sctp_paramhdr_t), param); | |
1da177e4 LT |
1804 | } |
1805 | ||
1806 | return 0; | |
1807 | } | |
1808 | ||
1809 | ||
1810 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1811 | * send back an indicator to the peer. | |
1812 | */ | |
1813 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1814 | union sctp_params param, | |
1815 | struct sctp_chunk *chunk, | |
1816 | struct sctp_chunk **errp) | |
1817 | { | |
1818 | __u16 len = ntohs(param.p->length); | |
1819 | ||
7ab90804 VY |
1820 | /* Processing of the HOST_NAME parameter will generate an |
1821 | * ABORT. If we've accumulated any non-fatal errors, they | |
1822 | * would be unrecognized parameters and we should not include | |
1823 | * them in the ABORT. | |
1824 | */ | |
1825 | if (*errp) | |
1826 | sctp_chunk_free(*errp); | |
1827 | ||
1828 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1da177e4 | 1829 | |
00f1c2df WY |
1830 | if (*errp) { |
1831 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); | |
1832 | sctp_addto_chunk(*errp, len, param.v); | |
1833 | } | |
1da177e4 LT |
1834 | |
1835 | /* Stop processing this chunk. */ | |
1836 | return 0; | |
1837 | } | |
1838 | ||
d6701191 VY |
1839 | static int sctp_verify_ext_param(union sctp_params param) |
1840 | { | |
1841 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
1842 | int have_auth = 0; | |
1843 | int have_asconf = 0; | |
1844 | int i; | |
1845 | ||
1846 | for (i = 0; i < num_ext; i++) { | |
1847 | switch (param.ext->chunks[i]) { | |
1848 | case SCTP_CID_AUTH: | |
1849 | have_auth = 1; | |
1850 | break; | |
1851 | case SCTP_CID_ASCONF: | |
1852 | case SCTP_CID_ASCONF_ACK: | |
1853 | have_asconf = 1; | |
1854 | break; | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1859 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
1860 | * only if ADD-IP is turned on and we are not backward-compatible | |
1861 | * mode. | |
1862 | */ | |
1863 | if (sctp_addip_noauth) | |
1864 | return 1; | |
1865 | ||
1866 | if (sctp_addip_enable && !have_auth && have_asconf) | |
1867 | return 0; | |
1868 | ||
1869 | return 1; | |
1870 | } | |
1871 | ||
131a47e3 VY |
1872 | static void sctp_process_ext_param(struct sctp_association *asoc, |
1873 | union sctp_params param) | |
1874 | { | |
1875 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
1876 | int i; | |
1877 | ||
1878 | for (i = 0; i < num_ext; i++) { | |
1879 | switch (param.ext->chunks[i]) { | |
1880 | case SCTP_CID_FWD_TSN: | |
1881 | if (sctp_prsctp_enable && | |
1882 | !asoc->peer.prsctp_capable) | |
1883 | asoc->peer.prsctp_capable = 1; | |
1884 | break; | |
730fc3d0 VY |
1885 | case SCTP_CID_AUTH: |
1886 | /* if the peer reports AUTH, assume that he | |
1887 | * supports AUTH. | |
1888 | */ | |
1889 | asoc->peer.auth_capable = 1; | |
1890 | break; | |
131a47e3 VY |
1891 | case SCTP_CID_ASCONF: |
1892 | case SCTP_CID_ASCONF_ACK: | |
88799fe5 | 1893 | asoc->peer.asconf_capable = 1; |
6b2f9cb6 | 1894 | break; |
131a47e3 VY |
1895 | default: |
1896 | break; | |
1897 | } | |
1898 | } | |
1899 | } | |
1900 | ||
1da177e4 LT |
1901 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
1902 | * | |
1903 | * The Parameter Types are encoded such that the | |
1904 | * highest-order two bits specify the action that must be | |
1905 | * taken if the processing endpoint does not recognize the | |
1906 | * Parameter Type. | |
1907 | * | |
7ab90804 VY |
1908 | * 00 - Stop processing this parameter; do not process any further |
1909 | * parameters within this chunk | |
1da177e4 | 1910 | * |
7ab90804 VY |
1911 | * 01 - Stop processing this parameter, do not process any further |
1912 | * parameters within this chunk, and report the unrecognized | |
1913 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
1914 | * |
1915 | * 10 - Skip this parameter and continue processing. | |
1916 | * | |
1917 | * 11 - Skip this parameter and continue processing but | |
1918 | * report the unrecognized parameter in an | |
7ab90804 | 1919 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
1920 | * |
1921 | * Return value: | |
7ab90804 VY |
1922 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
1923 | * SCTP_IERROR_ERROR - stop and report an error. | |
1924 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 1925 | */ |
7ab90804 VY |
1926 | static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, |
1927 | union sctp_params param, | |
1928 | struct sctp_chunk *chunk, | |
1929 | struct sctp_chunk **errp) | |
1da177e4 | 1930 | { |
7ab90804 | 1931 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
1932 | |
1933 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
1934 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 1935 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
1936 | break; |
1937 | case SCTP_PARAM_ACTION_SKIP: | |
1938 | break; | |
7ab90804 VY |
1939 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
1940 | retval = SCTP_IERROR_ERROR; | |
1941 | /* Fall through */ | |
1da177e4 LT |
1942 | case SCTP_PARAM_ACTION_SKIP_ERR: |
1943 | /* Make an ERROR chunk, preparing enough room for | |
1944 | * returning multiple unknown parameters. | |
1945 | */ | |
1946 | if (NULL == *errp) | |
1947 | *errp = sctp_make_op_error_space(asoc, chunk, | |
1948 | ntohs(chunk->chunk_hdr->length)); | |
1949 | ||
1950 | if (*errp) { | |
1951 | sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
1da177e4 | 1952 | WORD_ROUND(ntohs(param.p->length))); |
00f1c2df WY |
1953 | sctp_addto_chunk(*errp, |
1954 | WORD_ROUND(ntohs(param.p->length)), | |
1955 | param.v); | |
1da177e4 LT |
1956 | } else { |
1957 | /* If there is no memory for generating the ERROR | |
1958 | * report as specified, an ABORT will be triggered | |
1959 | * to the peer and the association won't be | |
1960 | * established. | |
1961 | */ | |
7ab90804 | 1962 | retval = SCTP_IERROR_NOMEM; |
1da177e4 | 1963 | } |
1da177e4 LT |
1964 | break; |
1965 | default: | |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | return retval; | |
1970 | } | |
1971 | ||
7ab90804 | 1972 | /* Verify variable length parameters |
1da177e4 | 1973 | * Return values: |
7ab90804 VY |
1974 | * SCTP_IERROR_ABORT - trigger an ABORT |
1975 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
1976 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
1977 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 1978 | */ |
7ab90804 VY |
1979 | static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc, |
1980 | union sctp_params param, | |
1981 | sctp_cid_t cid, | |
1982 | struct sctp_chunk *chunk, | |
1983 | struct sctp_chunk **err_chunk) | |
1da177e4 | 1984 | { |
7ab90804 | 1985 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
1986 | |
1987 | /* FIXME - This routine is not looking at each parameter per the | |
1988 | * chunk type, i.e., unrecognized parameters should be further | |
1989 | * identified based on the chunk id. | |
1990 | */ | |
1991 | ||
1992 | switch (param.p->type) { | |
1993 | case SCTP_PARAM_IPV4_ADDRESS: | |
1994 | case SCTP_PARAM_IPV6_ADDRESS: | |
1995 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
1996 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
1997 | case SCTP_PARAM_STATE_COOKIE: | |
1998 | case SCTP_PARAM_HEARTBEAT_INFO: | |
1999 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2000 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2001 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2002 | break; |
2003 | ||
131a47e3 | 2004 | case SCTP_PARAM_SUPPORTED_EXT: |
d6701191 VY |
2005 | if (!sctp_verify_ext_param(param)) |
2006 | return SCTP_IERROR_ABORT; | |
1da177e4 LT |
2007 | break; |
2008 | ||
d6de3097 VY |
2009 | case SCTP_PARAM_SET_PRIMARY: |
2010 | if (sctp_addip_enable) | |
2011 | break; | |
2012 | goto fallthrough; | |
2013 | ||
1da177e4 LT |
2014 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2015 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2016 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2017 | retval = SCTP_IERROR_ABORT; | |
2018 | break; | |
131a47e3 | 2019 | |
1da177e4 LT |
2020 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
2021 | if (sctp_prsctp_enable) | |
2022 | break; | |
730fc3d0 VY |
2023 | goto fallthrough; |
2024 | ||
2025 | case SCTP_PARAM_RANDOM: | |
2026 | if (!sctp_auth_enable) | |
2027 | goto fallthrough; | |
2028 | ||
2029 | /* SCTP-AUTH: Secion 6.1 | |
2030 | * If the random number is not 32 byte long the association | |
2031 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2032 | * cause 'Protocol Violation'. | |
2033 | */ | |
2034 | if (SCTP_AUTH_RANDOM_LENGTH != | |
7ab90804 VY |
2035 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { |
2036 | sctp_process_inv_paramlength(asoc, param.p, | |
730fc3d0 | 2037 | chunk, err_chunk); |
7ab90804 VY |
2038 | retval = SCTP_IERROR_ABORT; |
2039 | } | |
730fc3d0 VY |
2040 | break; |
2041 | ||
2042 | case SCTP_PARAM_CHUNKS: | |
2043 | if (!sctp_auth_enable) | |
2044 | goto fallthrough; | |
2045 | ||
2046 | /* SCTP-AUTH: Section 3.2 | |
2047 | * The CHUNKS parameter MUST be included once in the INIT or | |
2048 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2049 | * chunks. Its maximum length is 260 bytes. | |
2050 | */ | |
7ab90804 VY |
2051 | if (260 < ntohs(param.p->length)) { |
2052 | sctp_process_inv_paramlength(asoc, param.p, | |
2053 | chunk, err_chunk); | |
2054 | retval = SCTP_IERROR_ABORT; | |
2055 | } | |
730fc3d0 VY |
2056 | break; |
2057 | ||
2058 | case SCTP_PARAM_HMAC_ALGO: | |
ec9dbb1c | 2059 | if (sctp_auth_enable) |
730fc3d0 | 2060 | break; |
d808ad9a | 2061 | /* Fall Through */ |
730fc3d0 | 2062 | fallthrough: |
1da177e4 LT |
2063 | default: |
2064 | SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", | |
2065 | ntohs(param.p->type), cid); | |
7ab90804 | 2066 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2067 | break; |
2068 | } | |
2069 | return retval; | |
2070 | } | |
2071 | ||
2072 | /* Verify the INIT packet before we process it. */ | |
2073 | int sctp_verify_init(const struct sctp_association *asoc, | |
2074 | sctp_cid_t cid, | |
2075 | sctp_init_chunk_t *peer_init, | |
2076 | struct sctp_chunk *chunk, | |
2077 | struct sctp_chunk **errp) | |
2078 | { | |
2079 | union sctp_params param; | |
2080 | int has_cookie = 0; | |
7ab90804 | 2081 | int result; |
1da177e4 LT |
2082 | |
2083 | /* Verify stream values are non-zero. */ | |
2084 | if ((0 == peer_init->init_hdr.num_outbound_streams) || | |
d023f629 VY |
2085 | (0 == peer_init->init_hdr.num_inbound_streams) || |
2086 | (0 == peer_init->init_hdr.init_tag) || | |
2087 | (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { | |
1da177e4 | 2088 | |
7ab90804 | 2089 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 LT |
2090 | } |
2091 | ||
2092 | /* Check for missing mandatory parameters. */ | |
2093 | sctp_walk_params(param, peer_init, init_hdr.params) { | |
2094 | ||
2095 | if (SCTP_PARAM_STATE_COOKIE == param.p->type) | |
2096 | has_cookie = 1; | |
2097 | ||
2098 | } /* for (loop through all parameters) */ | |
2099 | ||
2100 | /* There is a possibility that a parameter length was bad and | |
2101 | * in that case we would have stoped walking the parameters. | |
2102 | * The current param.p would point at the bad one. | |
2103 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2104 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2105 | * error handling code build and send the packet. | |
2106 | */ | |
7ab90804 VY |
2107 | if (param.v != (void*)chunk->chunk_end) |
2108 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); | |
1da177e4 LT |
2109 | |
2110 | /* The only missing mandatory param possible today is | |
2111 | * the state cookie for an INIT-ACK chunk. | |
2112 | */ | |
7ab90804 VY |
2113 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2114 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2115 | chunk, errp); | |
1da177e4 | 2116 | |
7ab90804 | 2117 | /* Verify all the variable length parameters */ |
1da177e4 LT |
2118 | sctp_walk_params(param, peer_init, init_hdr.params) { |
2119 | ||
7ab90804 VY |
2120 | result = sctp_verify_param(asoc, param, cid, chunk, errp); |
2121 | switch (result) { | |
2122 | case SCTP_IERROR_ABORT: | |
2123 | case SCTP_IERROR_NOMEM: | |
1da177e4 | 2124 | return 0; |
7ab90804 | 2125 | case SCTP_IERROR_ERROR: |
1da177e4 | 2126 | return 1; |
7ab90804 VY |
2127 | case SCTP_IERROR_NO_ERROR: |
2128 | default: | |
2129 | break; | |
1da177e4 LT |
2130 | } |
2131 | ||
2132 | } /* for (loop through all parameters) */ | |
2133 | ||
2134 | return 1; | |
2135 | } | |
2136 | ||
2137 | /* Unpack the parameters in an INIT packet into an association. | |
2138 | * Returns 0 on failure, else success. | |
2139 | * FIXME: This is an association method. | |
2140 | */ | |
2141 | int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, | |
2142 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2143 | sctp_init_chunk_t *peer_init, gfp_t gfp) |
1da177e4 LT |
2144 | { |
2145 | union sctp_params param; | |
2146 | struct sctp_transport *transport; | |
2147 | struct list_head *pos, *temp; | |
2148 | char *cookie; | |
2149 | ||
2150 | /* We must include the address that the INIT packet came from. | |
2151 | * This is the only address that matters for an INIT packet. | |
2152 | * When processing a COOKIE ECHO, we retrieve the from address | |
2153 | * of the INIT from the cookie. | |
2154 | */ | |
2155 | ||
2156 | /* This implementation defaults to making the first transport | |
2157 | * added as the primary transport. The source address seems to | |
2158 | * be a a better choice than any of the embedded addresses. | |
2159 | */ | |
4bdf4b5f | 2160 | if (peer_addr) { |
6a1e5f33 | 2161 | if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
1da177e4 | 2162 | goto nomem; |
4bdf4b5f | 2163 | } |
1da177e4 LT |
2164 | |
2165 | /* Process the initialization parameters. */ | |
1da177e4 LT |
2166 | sctp_walk_params(param, peer_init, init_hdr.params) { |
2167 | ||
2168 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2169 | goto clean_up; |
1da177e4 LT |
2170 | } |
2171 | ||
730fc3d0 VY |
2172 | /* AUTH: After processing the parameters, make sure that we |
2173 | * have all the required info to potentially do authentications. | |
2174 | */ | |
2175 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2176 | !asoc->peer.peer_hmacs)) | |
2177 | asoc->peer.auth_capable = 0; | |
2178 | ||
d6701191 VY |
2179 | /* In a non-backward compatible mode, if the peer claims |
2180 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2181 | * that we MUST ABORT the association. Section 6. The section | |
2182 | * also give us an option to silently ignore the packet, which | |
2183 | * is what we'll do here. | |
6b2f9cb6 | 2184 | */ |
73d9c4fd VY |
2185 | if (!sctp_addip_noauth && |
2186 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { | |
6b2f9cb6 VY |
2187 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2188 | SCTP_PARAM_DEL_IP | | |
2189 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2190 | asoc->peer.asconf_capable = 0; |
d6701191 | 2191 | goto clean_up; |
6b2f9cb6 VY |
2192 | } |
2193 | ||
3f7a87d2 FF |
2194 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2195 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2196 | transport = list_entry(pos, struct sctp_transport, transports); | |
2197 | if (transport->state == SCTP_UNKNOWN) { | |
2198 | sctp_assoc_rm_peer(asoc, transport); | |
2199 | } | |
2200 | } | |
2201 | ||
1da177e4 LT |
2202 | /* The fixed INIT headers are always in network byte |
2203 | * order. | |
2204 | */ | |
2205 | asoc->peer.i.init_tag = | |
2206 | ntohl(peer_init->init_hdr.init_tag); | |
2207 | asoc->peer.i.a_rwnd = | |
2208 | ntohl(peer_init->init_hdr.a_rwnd); | |
2209 | asoc->peer.i.num_outbound_streams = | |
2210 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2211 | asoc->peer.i.num_inbound_streams = | |
2212 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2213 | asoc->peer.i.initial_tsn = | |
2214 | ntohl(peer_init->init_hdr.initial_tsn); | |
2215 | ||
2216 | /* Apply the upper bounds for output streams based on peer's | |
2217 | * number of inbound streams. | |
2218 | */ | |
2219 | if (asoc->c.sinit_num_ostreams > | |
2220 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2221 | asoc->c.sinit_num_ostreams = | |
2222 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2223 | } | |
2224 | ||
2225 | if (asoc->c.sinit_max_instreams > | |
2226 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2227 | asoc->c.sinit_max_instreams = | |
2228 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2229 | } | |
2230 | ||
2231 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2232 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2233 | ||
2234 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2235 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2236 | ||
2237 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2238 | cookie = asoc->peer.cookie; | |
2239 | if (cookie) { | |
af997d8c | 2240 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2241 | if (!asoc->peer.cookie) |
2242 | goto clean_up; | |
1da177e4 LT |
2243 | } |
2244 | ||
2245 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2246 | * high (for example, implementations MAY use the size of the receiver | |
2247 | * advertised window). | |
2248 | */ | |
2249 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
2250 | transport = list_entry(pos, struct sctp_transport, transports); | |
2251 | transport->ssthresh = asoc->peer.i.a_rwnd; | |
2252 | } | |
2253 | ||
2254 | /* Set up the TSN tracking pieces. */ | |
2255 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, | |
2256 | asoc->peer.i.initial_tsn); | |
2257 | ||
2258 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2259 | * | |
2260 | * The stream sequence number in all the streams shall start | |
2261 | * from 0 when the association is established. Also, when the | |
2262 | * stream sequence number reaches the value 65535 the next | |
2263 | * stream sequence number shall be set to 0. | |
2264 | */ | |
2265 | ||
3f7a87d2 | 2266 | /* Allocate storage for the negotiated streams if it is not a temporary |
d808ad9a | 2267 | * association. |
1da177e4 LT |
2268 | */ |
2269 | if (!asoc->temp) { | |
1da177e4 LT |
2270 | int error; |
2271 | ||
2272 | asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, | |
2273 | asoc->c.sinit_num_ostreams, gfp); | |
2274 | if (!asoc->ssnmap) | |
2275 | goto clean_up; | |
2276 | ||
07d93967 VY |
2277 | error = sctp_assoc_set_id(asoc, gfp); |
2278 | if (error) | |
1da177e4 | 2279 | goto clean_up; |
1da177e4 LT |
2280 | } |
2281 | ||
2282 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2283 | * | |
2284 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2285 | * remote endpoint it should do the following: | |
2286 | * ... | |
2287 | * A2) A serial number should be assigned to the Chunk. The serial | |
2288 | * number should be a monotonically increasing number. All serial | |
2289 | * numbers are defined to be initialized at the start of the | |
2290 | * association to the same value as the Initial TSN. | |
2291 | */ | |
2292 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2293 | return 1; | |
2294 | ||
2295 | clean_up: | |
2296 | /* Release the transport structures. */ | |
2297 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2298 | transport = list_entry(pos, struct sctp_transport, transports); | |
2299 | list_del_init(pos); | |
2300 | sctp_transport_free(transport); | |
2301 | } | |
3f7a87d2 FF |
2302 | |
2303 | asoc->peer.transport_count = 0; | |
2304 | ||
1da177e4 LT |
2305 | nomem: |
2306 | return 0; | |
2307 | } | |
2308 | ||
2309 | ||
2310 | /* Update asoc with the option described in param. | |
2311 | * | |
2312 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2313 | * | |
2314 | * asoc is the association to update. | |
2315 | * param is the variable length parameter to use for update. | |
2316 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2317 | * If the current packet is an INIT we want to minimize the amount of | |
2318 | * work we do. In particular, we should not build transport | |
2319 | * structures for the addresses. | |
2320 | */ | |
2321 | static int sctp_process_param(struct sctp_association *asoc, | |
2322 | union sctp_params param, | |
2323 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2324 | gfp_t gfp) |
1da177e4 LT |
2325 | { |
2326 | union sctp_addr addr; | |
2327 | int i; | |
2328 | __u16 sat; | |
2329 | int retval = 1; | |
2330 | sctp_scope_t scope; | |
2331 | time_t stale; | |
2332 | struct sctp_af *af; | |
d6de3097 VY |
2333 | union sctp_addr_param *addr_param; |
2334 | struct sctp_transport *t; | |
1da177e4 LT |
2335 | |
2336 | /* We maintain all INIT parameters in network byte order all the | |
2337 | * time. This allows us to not worry about whether the parameters | |
2338 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2339 | */ | |
2340 | switch (param.p->type) { | |
2341 | case SCTP_PARAM_IPV6_ADDRESS: | |
2342 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2343 | break; | |
2344 | /* Fall through. */ | |
2345 | case SCTP_PARAM_IPV4_ADDRESS: | |
2346 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
dd86d136 | 2347 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2348 | scope = sctp_scope(peer_addr); |
dd86d136 AV |
2349 | if (sctp_in_scope(&addr, scope)) |
2350 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) | |
1da177e4 LT |
2351 | return 0; |
2352 | break; | |
2353 | ||
2354 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2355 | if (!sctp_cookie_preserve_enable) | |
2356 | break; | |
2357 | ||
2358 | stale = ntohl(param.life->lifespan_increment); | |
2359 | ||
2360 | /* Suggested Cookie Life span increment's unit is msec, | |
2361 | * (1/1000sec). | |
2362 | */ | |
2363 | asoc->cookie_life.tv_sec += stale / 1000; | |
2364 | asoc->cookie_life.tv_usec += (stale % 1000) * 1000; | |
2365 | break; | |
2366 | ||
2367 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2368 | SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); | |
2369 | break; | |
2370 | ||
2371 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2372 | /* Turn off the default values first so we'll know which | |
2373 | * ones are really set by the peer. | |
2374 | */ | |
2375 | asoc->peer.ipv4_address = 0; | |
2376 | asoc->peer.ipv6_address = 0; | |
2377 | ||
140ee960 GJ |
2378 | /* Assume that peer supports the address family |
2379 | * by which it sends a packet. | |
2380 | */ | |
2381 | if (peer_addr->sa.sa_family == AF_INET6) | |
2382 | asoc->peer.ipv6_address = 1; | |
2383 | else if (peer_addr->sa.sa_family == AF_INET) | |
2384 | asoc->peer.ipv4_address = 1; | |
2385 | ||
1da177e4 LT |
2386 | /* Cycle through address types; avoid divide by 0. */ |
2387 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2388 | if (sat) | |
2389 | sat /= sizeof(__u16); | |
2390 | ||
2391 | for (i = 0; i < sat; ++i) { | |
2392 | switch (param.sat->types[i]) { | |
2393 | case SCTP_PARAM_IPV4_ADDRESS: | |
2394 | asoc->peer.ipv4_address = 1; | |
2395 | break; | |
2396 | ||
2397 | case SCTP_PARAM_IPV6_ADDRESS: | |
2398 | asoc->peer.ipv6_address = 1; | |
2399 | break; | |
2400 | ||
2401 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2402 | asoc->peer.hostname_address = 1; | |
2403 | break; | |
2404 | ||
2405 | default: /* Just ignore anything else. */ | |
2406 | break; | |
3ff50b79 | 2407 | } |
1da177e4 LT |
2408 | } |
2409 | break; | |
2410 | ||
2411 | case SCTP_PARAM_STATE_COOKIE: | |
2412 | asoc->peer.cookie_len = | |
2413 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2414 | asoc->peer.cookie = param.cookie->body; | |
2415 | break; | |
2416 | ||
2417 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2418 | /* Would be odd to receive, but it causes no problems. */ | |
2419 | break; | |
2420 | ||
2421 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2422 | /* Rejected during verify stage. */ | |
2423 | break; | |
2424 | ||
2425 | case SCTP_PARAM_ECN_CAPABLE: | |
2426 | asoc->peer.ecn_capable = 1; | |
2427 | break; | |
2428 | ||
0f3fffd8 ISJ |
2429 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
2430 | asoc->peer.adaptation_ind = param.aind->adaptation_ind; | |
1da177e4 LT |
2431 | break; |
2432 | ||
d6de3097 VY |
2433 | case SCTP_PARAM_SET_PRIMARY: |
2434 | addr_param = param.v + sizeof(sctp_addip_param_t); | |
2435 | ||
2436 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2437 | af->from_addr_param(&addr, addr_param, | |
2438 | htons(asoc->peer.port), 0); | |
2439 | ||
2440 | /* if the address is invalid, we can't process it. | |
2441 | * XXX: see spec for what to do. | |
2442 | */ | |
2443 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2444 | break; | |
2445 | ||
2446 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2447 | if (!t) | |
2448 | break; | |
2449 | ||
2450 | sctp_assoc_set_primary(asoc, t); | |
2451 | break; | |
2452 | ||
131a47e3 VY |
2453 | case SCTP_PARAM_SUPPORTED_EXT: |
2454 | sctp_process_ext_param(asoc, param); | |
2455 | break; | |
2456 | ||
1da177e4 LT |
2457 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
2458 | if (sctp_prsctp_enable) { | |
2459 | asoc->peer.prsctp_capable = 1; | |
2460 | break; | |
2461 | } | |
d808ad9a | 2462 | /* Fall Through */ |
730fc3d0 VY |
2463 | goto fall_through; |
2464 | ||
2465 | case SCTP_PARAM_RANDOM: | |
2466 | if (!sctp_auth_enable) | |
2467 | goto fall_through; | |
2468 | ||
2469 | /* Save peer's random parameter */ | |
2470 | asoc->peer.peer_random = kmemdup(param.p, | |
2471 | ntohs(param.p->length), gfp); | |
2472 | if (!asoc->peer.peer_random) { | |
2473 | retval = 0; | |
2474 | break; | |
2475 | } | |
2476 | break; | |
2477 | ||
2478 | case SCTP_PARAM_HMAC_ALGO: | |
2479 | if (!sctp_auth_enable) | |
2480 | goto fall_through; | |
2481 | ||
2482 | /* Save peer's HMAC list */ | |
2483 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2484 | ntohs(param.p->length), gfp); | |
2485 | if (!asoc->peer.peer_hmacs) { | |
2486 | retval = 0; | |
2487 | break; | |
2488 | } | |
2489 | ||
2490 | /* Set the default HMAC the peer requested*/ | |
2491 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2492 | break; | |
2493 | ||
2494 | case SCTP_PARAM_CHUNKS: | |
2495 | if (!sctp_auth_enable) | |
2496 | goto fall_through; | |
2497 | ||
2498 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2499 | ntohs(param.p->length), gfp); | |
2500 | if (!asoc->peer.peer_chunks) | |
2501 | retval = 0; | |
2502 | break; | |
2503 | fall_through: | |
1da177e4 LT |
2504 | default: |
2505 | /* Any unrecognized parameters should have been caught | |
2506 | * and handled by sctp_verify_param() which should be | |
2507 | * called prior to this routine. Simply log the error | |
2508 | * here. | |
2509 | */ | |
2510 | SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", | |
2511 | ntohs(param.p->type), asoc); | |
2512 | break; | |
3ff50b79 | 2513 | } |
1da177e4 LT |
2514 | |
2515 | return retval; | |
2516 | } | |
2517 | ||
2518 | /* Select a new verification tag. */ | |
2519 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2520 | { | |
2521 | /* I believe that this random number generator complies with RFC1750. | |
2522 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2523 | */ | |
2524 | __u32 x; | |
2525 | ||
2526 | do { | |
2527 | get_random_bytes(&x, sizeof(__u32)); | |
2528 | } while (x == 0); | |
2529 | ||
2530 | return x; | |
2531 | } | |
2532 | ||
2533 | /* Select an initial TSN to send during startup. */ | |
2534 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2535 | { | |
2536 | __u32 retval; | |
2537 | ||
2538 | get_random_bytes(&retval, sizeof(__u32)); | |
2539 | return retval; | |
2540 | } | |
2541 | ||
2542 | /* | |
2543 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2544 | * 0 1 2 3 | |
2545 | * 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 | |
2546 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2547 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2548 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2549 | * | Serial Number | | |
2550 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2551 | * | Address Parameter | | |
2552 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2553 | * | ASCONF Parameter #1 | | |
2554 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2555 | * \ \ | |
2556 | * / .... / | |
2557 | * \ \ | |
2558 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2559 | * | ASCONF Parameter #N | | |
2560 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2561 | * | |
d808ad9a | 2562 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2563 | */ |
2564 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2565 | union sctp_addr *addr, | |
2566 | int vparam_len) | |
2567 | { | |
2568 | sctp_addiphdr_t asconf; | |
2569 | struct sctp_chunk *retval; | |
2570 | int length = sizeof(asconf) + vparam_len; | |
2571 | union sctp_addr_param addrparam; | |
2572 | int addrlen; | |
2573 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2574 | ||
2575 | addrlen = af->to_addr_param(addr, &addrparam); | |
2576 | if (!addrlen) | |
2577 | return NULL; | |
2578 | length += addrlen; | |
2579 | ||
2580 | /* Create the chunk. */ | |
2581 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); | |
2582 | if (!retval) | |
2583 | return NULL; | |
2584 | ||
2585 | asconf.serial = htonl(asoc->addip_serial++); | |
2586 | ||
2587 | retval->subh.addip_hdr = | |
2588 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2589 | retval->param_hdr.v = | |
2590 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2591 | ||
2592 | return retval; | |
2593 | } | |
2594 | ||
2595 | /* ADDIP | |
2596 | * 3.2.1 Add IP Address | |
2597 | * 0 1 2 3 | |
2598 | * 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 | |
2599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2600 | * | Type = 0xC001 | Length = Variable | | |
2601 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2602 | * | ASCONF-Request Correlation ID | | |
2603 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2604 | * | Address Parameter | | |
2605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2606 | * | |
2607 | * 3.2.2 Delete IP Address | |
2608 | * 0 1 2 3 | |
2609 | * 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 | |
2610 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2611 | * | Type = 0xC002 | Length = Variable | | |
2612 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2613 | * | ASCONF-Request Correlation ID | | |
2614 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2615 | * | Address Parameter | | |
2616 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2617 | * | |
2618 | */ | |
2619 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
2620 | union sctp_addr *laddr, | |
2621 | struct sockaddr *addrs, | |
2622 | int addrcnt, | |
dbc16db1 | 2623 | __be16 flags) |
1da177e4 LT |
2624 | { |
2625 | sctp_addip_param_t param; | |
2626 | struct sctp_chunk *retval; | |
2627 | union sctp_addr_param addr_param; | |
2628 | union sctp_addr *addr; | |
2629 | void *addr_buf; | |
2630 | struct sctp_af *af; | |
2631 | int paramlen = sizeof(param); | |
2632 | int addr_param_len = 0; | |
2633 | int totallen = 0; | |
2634 | int i; | |
2635 | ||
2636 | /* Get total length of all the address parameters. */ | |
2637 | addr_buf = addrs; | |
2638 | for (i = 0; i < addrcnt; i++) { | |
2639 | addr = (union sctp_addr *)addr_buf; | |
2640 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2641 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2642 | ||
2643 | totallen += paramlen; | |
2644 | totallen += addr_param_len; | |
2645 | ||
2646 | addr_buf += af->sockaddr_len; | |
2647 | } | |
2648 | ||
2649 | /* Create an asconf chunk with the required length. */ | |
2650 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2651 | if (!retval) | |
2652 | return NULL; | |
2653 | ||
2654 | /* Add the address parameters to the asconf chunk. */ | |
2655 | addr_buf = addrs; | |
2656 | for (i = 0; i < addrcnt; i++) { | |
2657 | addr = (union sctp_addr *)addr_buf; | |
2658 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2659 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2660 | param.param_hdr.type = flags; | |
2661 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2662 | param.crr_id = i; | |
2663 | ||
2664 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2665 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2666 | ||
2667 | addr_buf += af->sockaddr_len; | |
2668 | } | |
2669 | return retval; | |
2670 | } | |
2671 | ||
2672 | /* ADDIP | |
2673 | * 3.2.4 Set Primary IP Address | |
2674 | * 0 1 2 3 | |
2675 | * 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 | |
2676 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2677 | * | Type =0xC004 | Length = Variable | | |
2678 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2679 | * | ASCONF-Request Correlation ID | | |
2680 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2681 | * | Address Parameter | | |
2682 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2683 | * | |
d808ad9a | 2684 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2685 | */ |
2686 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2687 | union sctp_addr *addr) | |
2688 | { | |
2689 | sctp_addip_param_t param; | |
2690 | struct sctp_chunk *retval; | |
2691 | int len = sizeof(param); | |
2692 | union sctp_addr_param addrparam; | |
2693 | int addrlen; | |
2694 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2695 | ||
2696 | addrlen = af->to_addr_param(addr, &addrparam); | |
2697 | if (!addrlen) | |
2698 | return NULL; | |
2699 | len += addrlen; | |
2700 | ||
2701 | /* Create the chunk and make asconf header. */ | |
2702 | retval = sctp_make_asconf(asoc, addr, len); | |
2703 | if (!retval) | |
2704 | return NULL; | |
2705 | ||
2706 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2707 | param.param_hdr.length = htons(len); | |
2708 | param.crr_id = 0; | |
2709 | ||
2710 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2711 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2712 | ||
2713 | return retval; | |
2714 | } | |
2715 | ||
2716 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2717 | * 0 1 2 3 | |
2718 | * 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 | |
2719 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2720 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2721 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2722 | * | Serial Number | | |
2723 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2724 | * | ASCONF Parameter Response#1 | | |
2725 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2726 | * \ \ | |
2727 | * / .... / | |
2728 | * \ \ | |
2729 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2730 | * | ASCONF Parameter Response#N | | |
2731 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2732 | * | |
d808ad9a | 2733 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2734 | */ |
2735 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2736 | __u32 serial, int vparam_len) | |
2737 | { | |
2738 | sctp_addiphdr_t asconf; | |
2739 | struct sctp_chunk *retval; | |
2740 | int length = sizeof(asconf) + vparam_len; | |
2741 | ||
2742 | /* Create the chunk. */ | |
2743 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); | |
2744 | if (!retval) | |
2745 | return NULL; | |
2746 | ||
2747 | asconf.serial = htonl(serial); | |
2748 | ||
2749 | retval->subh.addip_hdr = | |
2750 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2751 | ||
2752 | return retval; | |
2753 | } | |
2754 | ||
2755 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2756 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
dbc16db1 | 2757 | __be16 err_code, sctp_addip_param_t *asconf_param) |
1da177e4 LT |
2758 | { |
2759 | sctp_addip_param_t ack_param; | |
2760 | sctp_errhdr_t err_param; | |
2761 | int asconf_param_len = 0; | |
2762 | int err_param_len = 0; | |
dbc16db1 | 2763 | __be16 response_type; |
1da177e4 LT |
2764 | |
2765 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2766 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2767 | } else { | |
2768 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2769 | err_param_len = sizeof(err_param); | |
2770 | if (asconf_param) | |
2771 | asconf_param_len = | |
2772 | ntohs(asconf_param->param_hdr.length); | |
2773 | } | |
2774 | ||
d808ad9a | 2775 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2776 | ack_param.param_hdr.type = response_type; |
2777 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2778 | err_param_len + | |
2779 | asconf_param_len); | |
2780 | ack_param.crr_id = crr_id; | |
2781 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2782 | ||
2783 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2784 | return; | |
2785 | ||
2786 | /* Add Error Cause parameter. */ | |
2787 | err_param.cause = err_code; | |
2788 | err_param.length = htons(err_param_len + asconf_param_len); | |
2789 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
2790 | ||
2791 | /* Add the failed TLV copied from ASCONF chunk. */ | |
2792 | if (asconf_param) | |
2793 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
2794 | } | |
2795 | ||
2796 | /* Process a asconf parameter. */ | |
dbc16db1 | 2797 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
1da177e4 LT |
2798 | struct sctp_chunk *asconf, |
2799 | sctp_addip_param_t *asconf_param) | |
2800 | { | |
2801 | struct sctp_transport *peer; | |
2802 | struct sctp_af *af; | |
2803 | union sctp_addr addr; | |
1da177e4 | 2804 | union sctp_addr_param *addr_param; |
5f242a13 | 2805 | |
1da177e4 LT |
2806 | addr_param = (union sctp_addr_param *) |
2807 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); | |
2808 | ||
2809 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); | |
2810 | if (unlikely(!af)) | |
2811 | return SCTP_ERROR_INV_PARAM; | |
2812 | ||
dd86d136 | 2813 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
2814 | |
2815 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
2816 | * or multicast address. | |
2817 | * (note: wildcard is permitted and requires special handling so | |
2818 | * make sure we check for that) | |
2819 | */ | |
2820 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
2821 | return SCTP_ERROR_INV_PARAM; | |
2822 | ||
1da177e4 LT |
2823 | switch (asconf_param->param_hdr.type) { |
2824 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
2825 | /* Section 4.2.1: |
2826 | * If the address 0.0.0.0 or ::0 is provided, the source | |
2827 | * address of the packet MUST be added. | |
2828 | */ | |
2829 | if (af->is_any(&addr)) | |
2830 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
2831 | ||
1da177e4 | 2832 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
2833 | * request and does not have the local resources to add this |
2834 | * new address to the association, it MUST return an Error | |
2835 | * Cause TLV set to the new error code 'Operation Refused | |
2836 | * Due to Resource Shortage'. | |
2837 | */ | |
1da177e4 | 2838 | |
dd86d136 | 2839 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
2840 | if (!peer) |
2841 | return SCTP_ERROR_RSRC_LOW; | |
2842 | ||
2843 | /* Start the heartbeat timer. */ | |
2844 | if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) | |
2845 | sctp_transport_hold(peer); | |
2846 | break; | |
2847 | case SCTP_PARAM_DEL_IP: | |
2848 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
2849 | * last remaining IP address of a peer endpoint, the receiver |
2850 | * MUST send an Error Cause TLV with the error cause set to the | |
2851 | * new error code 'Request to Delete Last Remaining IP Address'. | |
2852 | */ | |
42e30bf3 | 2853 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
2854 | return SCTP_ERROR_DEL_LAST_IP; |
2855 | ||
2856 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
2857 | * address which is also the source address of the IP packet | |
2858 | * which contained the ASCONF chunk, the receiver MUST reject | |
2859 | * this request. To reject the request the receiver MUST send | |
2860 | * an Error Cause TLV set to the new error code 'Request to | |
2861 | * Delete Source IP Address' | |
2862 | */ | |
6a1e5f33 | 2863 | if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) |
1da177e4 LT |
2864 | return SCTP_ERROR_DEL_SRC_IP; |
2865 | ||
42e30bf3 VY |
2866 | /* Section 4.2.2 |
2867 | * If the address 0.0.0.0 or ::0 is provided, all | |
2868 | * addresses of the peer except the source address of the | |
2869 | * packet MUST be deleted. | |
2870 | */ | |
2871 | if (af->is_any(&addr)) { | |
2872 | sctp_assoc_set_primary(asoc, asconf->transport); | |
2873 | sctp_assoc_del_nonprimary_peers(asoc, | |
2874 | asconf->transport); | |
2875 | } else | |
2876 | sctp_assoc_del_peer(asoc, &addr); | |
1da177e4 LT |
2877 | break; |
2878 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
2879 | /* ADDIP Section 4.2.4 |
2880 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
2881 | * MAY mark the source address of the packet as its | |
2882 | * primary. | |
2883 | */ | |
2884 | if (af->is_any(&addr)) | |
2885 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
2886 | ||
dd86d136 | 2887 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 LT |
2888 | if (!peer) |
2889 | return SCTP_ERROR_INV_PARAM; | |
2890 | ||
2891 | sctp_assoc_set_primary(asoc, peer); | |
2892 | break; | |
2893 | default: | |
2894 | return SCTP_ERROR_INV_PARAM; | |
2895 | break; | |
2896 | } | |
2897 | ||
2898 | return SCTP_ERROR_NO_ERROR; | |
2899 | } | |
2900 | ||
6f4c618d WY |
2901 | /* Verify the ASCONF packet before we process it. */ |
2902 | int sctp_verify_asconf(const struct sctp_association *asoc, | |
2903 | struct sctp_paramhdr *param_hdr, void *chunk_end, | |
2904 | struct sctp_paramhdr **errp) { | |
2905 | sctp_addip_param_t *asconf_param; | |
2906 | union sctp_params param; | |
2907 | int length, plen; | |
2908 | ||
2909 | param.v = (sctp_paramhdr_t *) param_hdr; | |
2910 | while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { | |
2911 | length = ntohs(param.p->length); | |
2912 | *errp = param.p; | |
2913 | ||
2914 | if (param.v > chunk_end - length || | |
2915 | length < sizeof(sctp_paramhdr_t)) | |
2916 | return 0; | |
2917 | ||
2918 | switch (param.p->type) { | |
2919 | case SCTP_PARAM_ADD_IP: | |
2920 | case SCTP_PARAM_DEL_IP: | |
2921 | case SCTP_PARAM_SET_PRIMARY: | |
2922 | asconf_param = (sctp_addip_param_t *)param.v; | |
2923 | plen = ntohs(asconf_param->param_hdr.length); | |
2924 | if (plen < sizeof(sctp_addip_param_t) + | |
2925 | sizeof(sctp_paramhdr_t)) | |
2926 | return 0; | |
2927 | break; | |
2928 | case SCTP_PARAM_SUCCESS_REPORT: | |
2929 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
2930 | if (length != sizeof(sctp_addip_param_t)) | |
2931 | return 0; | |
2932 | ||
2933 | break; | |
2934 | default: | |
2935 | break; | |
2936 | } | |
2937 | ||
2938 | param.v += WORD_ROUND(length); | |
2939 | } | |
2940 | ||
2941 | if (param.v != chunk_end) | |
2942 | return 0; | |
2943 | ||
2944 | return 1; | |
2945 | } | |
2946 | ||
d808ad9a | 2947 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
2948 | * return an ASCONF_ACK chunk to be sent in response. |
2949 | */ | |
2950 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
2951 | struct sctp_chunk *asconf) | |
2952 | { | |
2953 | sctp_addiphdr_t *hdr; | |
2954 | union sctp_addr_param *addr_param; | |
2955 | sctp_addip_param_t *asconf_param; | |
2956 | struct sctp_chunk *asconf_ack; | |
2957 | ||
dbc16db1 | 2958 | __be16 err_code; |
1da177e4 | 2959 | int length = 0; |
f3830ccc | 2960 | int chunk_len; |
1da177e4 LT |
2961 | __u32 serial; |
2962 | int all_param_pass = 1; | |
2963 | ||
f3830ccc | 2964 | chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); |
1da177e4 LT |
2965 | hdr = (sctp_addiphdr_t *)asconf->skb->data; |
2966 | serial = ntohl(hdr->serial); | |
2967 | ||
d808ad9a | 2968 | /* Skip the addiphdr and store a pointer to address parameter. */ |
1da177e4 LT |
2969 | length = sizeof(sctp_addiphdr_t); |
2970 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
2971 | chunk_len -= length; | |
2972 | ||
2973 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 2974 | * asconf parameter. |
d808ad9a | 2975 | */ |
1da177e4 LT |
2976 | length = ntohs(addr_param->v4.param_hdr.length); |
2977 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); | |
2978 | chunk_len -= length; | |
2979 | ||
d808ad9a | 2980 | /* create an ASCONF_ACK chunk. |
1da177e4 LT |
2981 | * Based on the definitions of parameters, we know that the size of |
2982 | * ASCONF_ACK parameters are less than or equal to the twice of ASCONF | |
7aa1b54b | 2983 | * parameters. |
1da177e4 LT |
2984 | */ |
2985 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); | |
2986 | if (!asconf_ack) | |
2987 | goto done; | |
2988 | ||
2989 | /* Process the TLVs contained within the ASCONF chunk. */ | |
2990 | while (chunk_len > 0) { | |
2991 | err_code = sctp_process_asconf_param(asoc, asconf, | |
2992 | asconf_param); | |
2993 | /* ADDIP 4.1 A7) | |
2994 | * If an error response is received for a TLV parameter, | |
2995 | * all TLVs with no response before the failed TLV are | |
2996 | * considered successful if not reported. All TLVs after | |
2997 | * the failed response are considered unsuccessful unless | |
2998 | * a specific success indication is present for the parameter. | |
2999 | */ | |
3000 | if (SCTP_ERROR_NO_ERROR != err_code) | |
3001 | all_param_pass = 0; | |
3002 | ||
3003 | if (!all_param_pass) | |
3004 | sctp_add_asconf_response(asconf_ack, | |
3005 | asconf_param->crr_id, err_code, | |
3006 | asconf_param); | |
3007 | ||
3008 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3009 | * an IP address sends an 'Out of Resource' in its response, it | |
3010 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3011 | * in the ASCONF. |
1da177e4 LT |
3012 | */ |
3013 | if (SCTP_ERROR_RSRC_LOW == err_code) | |
3014 | goto done; | |
3015 | ||
3016 | /* Move to the next ASCONF param. */ | |
3017 | length = ntohs(asconf_param->param_hdr.length); | |
3018 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + | |
3019 | length); | |
3020 | chunk_len -= length; | |
3021 | } | |
d808ad9a | 3022 | |
1da177e4 LT |
3023 | done: |
3024 | asoc->peer.addip_serial++; | |
3025 | ||
3026 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3027 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3028 | */ |
3029 | if (asconf_ack) { | |
1da177e4 | 3030 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3031 | list_add_tail(&asconf_ack->transmitted_list, |
3032 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3033 | } |
3034 | ||
3035 | return asconf_ack; | |
3036 | } | |
3037 | ||
3038 | /* Process a asconf parameter that is successfully acked. */ | |
3039 | static int sctp_asconf_param_success(struct sctp_association *asoc, | |
3040 | sctp_addip_param_t *asconf_param) | |
3041 | { | |
3042 | struct sctp_af *af; | |
3043 | union sctp_addr addr; | |
3044 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; | |
3045 | union sctp_addr_param *addr_param; | |
3046 | struct list_head *pos; | |
3047 | struct sctp_transport *transport; | |
dc022a98 | 3048 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
3049 | int retval = 0; |
3050 | ||
3051 | addr_param = (union sctp_addr_param *) | |
3052 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); | |
3053 | ||
3054 | /* We have checked the packet before, so we do not check again. */ | |
3055 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); | |
dd86d136 | 3056 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3057 | |
3058 | switch (asconf_param->param_hdr.type) { | |
3059 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3060 | /* This is always done in BH context with a socket lock |
3061 | * held, so the list can not change. | |
3062 | */ | |
0ed90fb0 | 3063 | local_bh_disable(); |
559cf710 | 3064 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3065 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3066 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3067 | } |
0ed90fb0 | 3068 | local_bh_enable(); |
1da177e4 LT |
3069 | break; |
3070 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 VY |
3071 | local_bh_disable(); |
3072 | retval = sctp_del_bind_addr(bp, &addr); | |
3073 | local_bh_enable(); | |
1da177e4 LT |
3074 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
3075 | transport = list_entry(pos, struct sctp_transport, | |
3076 | transports); | |
dc022a98 | 3077 | dst_release(transport->dst); |
1da177e4 LT |
3078 | sctp_transport_route(transport, NULL, |
3079 | sctp_sk(asoc->base.sk)); | |
3080 | } | |
3081 | break; | |
3082 | default: | |
3083 | break; | |
3084 | } | |
3085 | ||
3086 | return retval; | |
3087 | } | |
3088 | ||
3089 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3090 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3091 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3092 | * ADDIP 4.1 |
3093 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3094 | * response before the failed TLV are considered successful if not reported. | |
3095 | * All TLVs after the failed response are considered unsuccessful unless a | |
3096 | * specific success indication is present for the parameter. | |
3097 | */ | |
dbc16db1 | 3098 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
1da177e4 LT |
3099 | sctp_addip_param_t *asconf_param, |
3100 | int no_err) | |
3101 | { | |
3102 | sctp_addip_param_t *asconf_ack_param; | |
3103 | sctp_errhdr_t *err_param; | |
3104 | int length; | |
f3830ccc | 3105 | int asconf_ack_len; |
dbc16db1 | 3106 | __be16 err_code; |
1da177e4 LT |
3107 | |
3108 | if (no_err) | |
3109 | err_code = SCTP_ERROR_NO_ERROR; | |
3110 | else | |
3111 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3112 | ||
f3830ccc WY |
3113 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
3114 | sizeof(sctp_chunkhdr_t); | |
3115 | ||
1da177e4 LT |
3116 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3117 | * the first asconf_ack parameter. | |
d808ad9a | 3118 | */ |
1da177e4 LT |
3119 | length = sizeof(sctp_addiphdr_t); |
3120 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + | |
3121 | length); | |
3122 | asconf_ack_len -= length; | |
3123 | ||
3124 | while (asconf_ack_len > 0) { | |
3125 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
3126 | switch(asconf_ack_param->param_hdr.type) { | |
3127 | case SCTP_PARAM_SUCCESS_REPORT: | |
3128 | return SCTP_ERROR_NO_ERROR; | |
3129 | case SCTP_PARAM_ERR_CAUSE: | |
3130 | length = sizeof(sctp_addip_param_t); | |
3131 | err_param = (sctp_errhdr_t *) | |
3132 | ((void *)asconf_ack_param + length); | |
3133 | asconf_ack_len -= length; | |
3134 | if (asconf_ack_len > 0) | |
3135 | return err_param->cause; | |
3136 | else | |
3137 | return SCTP_ERROR_INV_PARAM; | |
3138 | break; | |
3139 | default: | |
3140 | return SCTP_ERROR_INV_PARAM; | |
3141 | } | |
3142 | } | |
3143 | ||
3144 | length = ntohs(asconf_ack_param->param_hdr.length); | |
3145 | asconf_ack_param = (sctp_addip_param_t *) | |
3146 | ((void *)asconf_ack_param + length); | |
3147 | asconf_ack_len -= length; | |
3148 | } | |
3149 | ||
3150 | return err_code; | |
3151 | } | |
3152 | ||
3153 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3154 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3155 | struct sctp_chunk *asconf_ack) | |
3156 | { | |
3157 | struct sctp_chunk *asconf = asoc->addip_last_asconf; | |
3158 | union sctp_addr_param *addr_param; | |
3159 | sctp_addip_param_t *asconf_param; | |
3160 | int length = 0; | |
3161 | int asconf_len = asconf->skb->len; | |
3162 | int all_param_pass = 0; | |
3163 | int no_err = 1; | |
3164 | int retval = 0; | |
dbc16db1 | 3165 | __be16 err_code = SCTP_ERROR_NO_ERROR; |
1da177e4 LT |
3166 | |
3167 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3168 | * a pointer to address parameter. | |
d808ad9a | 3169 | */ |
1da177e4 LT |
3170 | length = sizeof(sctp_addip_chunk_t); |
3171 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
3172 | asconf_len -= length; | |
3173 | ||
3174 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3175 | * pointer to the first asconf parameter. |
d808ad9a | 3176 | */ |
1da177e4 LT |
3177 | length = ntohs(addr_param->v4.param_hdr.length); |
3178 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); | |
3179 | asconf_len -= length; | |
3180 | ||
3181 | /* ADDIP 4.1 | |
3182 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3183 | * failures are indicated, then all request(s) are considered | |
3184 | * successful. | |
3185 | */ | |
3186 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) | |
3187 | all_param_pass = 1; | |
3188 | ||
3189 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3190 | while (asconf_len > 0) { | |
3191 | if (all_param_pass) | |
3192 | err_code = SCTP_ERROR_NO_ERROR; | |
3193 | else { | |
3194 | err_code = sctp_get_asconf_response(asconf_ack, | |
3195 | asconf_param, | |
3196 | no_err); | |
3197 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3198 | no_err = 0; | |
3199 | } | |
3200 | ||
3201 | switch (err_code) { | |
3202 | case SCTP_ERROR_NO_ERROR: | |
3203 | retval = sctp_asconf_param_success(asoc, asconf_param); | |
3204 | break; | |
3205 | ||
3206 | case SCTP_ERROR_RSRC_LOW: | |
3207 | retval = 1; | |
3208 | break; | |
3209 | ||
3210 | case SCTP_ERROR_INV_PARAM: | |
3211 | /* Disable sending this type of asconf parameter in | |
3212 | * future. | |
d808ad9a | 3213 | */ |
1da177e4 LT |
3214 | asoc->peer.addip_disabled_mask |= |
3215 | asconf_param->param_hdr.type; | |
3216 | break; | |
3217 | ||
3218 | case SCTP_ERROR_REQ_REFUSED: | |
3219 | case SCTP_ERROR_DEL_LAST_IP: | |
3220 | case SCTP_ERROR_DEL_SRC_IP: | |
3221 | default: | |
3222 | break; | |
3223 | } | |
3224 | ||
3225 | /* Skip the processed asconf parameter and move to the next | |
3226 | * one. | |
d808ad9a | 3227 | */ |
1da177e4 LT |
3228 | length = ntohs(asconf_param->param_hdr.length); |
3229 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + | |
3230 | length); | |
3231 | asconf_len -= length; | |
3232 | } | |
3233 | ||
3234 | /* Free the cached last sent asconf chunk. */ | |
5f9646c3 | 3235 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3236 | sctp_chunk_free(asconf); |
3237 | asoc->addip_last_asconf = NULL; | |
3238 | ||
3239 | /* Send the next asconf chunk from the addip chunk queue. */ | |
79af02c2 DM |
3240 | if (!list_empty(&asoc->addip_chunk_list)) { |
3241 | struct list_head *entry = asoc->addip_chunk_list.next; | |
3242 | asconf = list_entry(entry, struct sctp_chunk, list); | |
3243 | ||
3244 | list_del_init(entry); | |
3245 | ||
1da177e4 LT |
3246 | /* Hold the chunk until an ASCONF_ACK is received. */ |
3247 | sctp_chunk_hold(asconf); | |
3248 | if (sctp_primitive_ASCONF(asoc, asconf)) | |
3249 | sctp_chunk_free(asconf); | |
3250 | else | |
3251 | asoc->addip_last_asconf = asconf; | |
3252 | } | |
3253 | ||
3254 | return retval; | |
3255 | } | |
3256 | ||
d808ad9a | 3257 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3258 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3259 | __u32 new_cum_tsn, size_t nstreams, | |
3260 | struct sctp_fwdtsn_skip *skiplist) | |
3261 | { | |
3262 | struct sctp_chunk *retval = NULL; | |
3263 | struct sctp_fwdtsn_chunk *ftsn_chunk; | |
d808ad9a | 3264 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3265 | struct sctp_fwdtsn_skip skip; |
3266 | size_t hint; | |
3267 | int i; | |
3268 | ||
3269 | hint = (nstreams + 1) * sizeof(__u32); | |
3270 | ||
1da177e4 LT |
3271 | retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); |
3272 | ||
3273 | if (!retval) | |
3274 | return NULL; | |
3275 | ||
3276 | ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; | |
3277 | ||
3278 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); | |
3279 | retval->subh.fwdtsn_hdr = | |
3280 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3281 | ||
3282 | for (i = 0; i < nstreams; i++) { | |
3283 | skip.stream = skiplist[i].stream; | |
3284 | skip.ssn = skiplist[i].ssn; | |
3285 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3286 | } | |
3287 | ||
3288 | return retval; | |
3289 | } |