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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement the state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * C. Robin <chris@hundredacre.ac.uk> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Xingang Guo <xingang.guo@intel.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Sridhar Samudrala <sri@us.ibm.com> | |
41 | * Daisy Chang <daisyc@us.ibm.com> | |
42 | * Ardelle Fan <ardelle.fan@intel.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
5821c769 | 48 | #include <crypto/hash.h> |
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/kernel.h> | |
51 | #include <linux/ip.h> | |
52 | #include <linux/ipv6.h> | |
53 | #include <linux/net.h> | |
54 | #include <linux/inet.h> | |
ebc3bbcf | 55 | #include <linux/scatterlist.h> |
5a0e3ad6 | 56 | #include <linux/slab.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | #include <linux/random.h> /* for get_random_bytes */ | |
61 | #include <net/sctp/sctp.h> | |
62 | #include <net/sctp/sm.h> | |
63 | ||
072017b4 | 64 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
65 | __u8 type, __u8 flags, int paylen, |
66 | gfp_t gfp); | |
072017b4 | 67 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 68 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 69 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
70 | __u8 type, __u8 flags, int paylen, |
71 | gfp_t gfp); | |
f48ef4c7 XL |
72 | static struct sctp_cookie_param *sctp_pack_cookie( |
73 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
74 | const struct sctp_association *asoc, |
75 | const struct sctp_chunk *init_chunk, | |
76 | int *cookie_len, | |
77 | const __u8 *raw_addrs, int addrs_len); | |
78 | static int sctp_process_param(struct sctp_association *asoc, | |
79 | union sctp_params param, | |
80 | const union sctp_addr *peer_addr, | |
dd0fc66f | 81 | gfp_t gfp); |
8ee4be37 VY |
82 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
83 | const void *data); | |
1da177e4 | 84 | |
072017b4 VY |
85 | /* Control chunk destructor */ |
86 | static void sctp_control_release_owner(struct sk_buff *skb) | |
87 | { | |
1b1e0bc9 XL |
88 | struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg; |
89 | ||
ec2e506c XL |
90 | if (chunk->shkey) { |
91 | struct sctp_shared_key *shkey = chunk->shkey; | |
92 | struct sctp_association *asoc = chunk->asoc; | |
93 | ||
94 | /* refcnt == 2 and !list_empty mean after this release, it's | |
95 | * not being used anywhere, and it's time to notify userland | |
96 | * that this shkey can be freed if it's been deactivated. | |
97 | */ | |
98 | if (shkey->deactivated && !list_empty(&shkey->key_list) && | |
99 | refcount_read(&shkey->refcnt) == 2) { | |
100 | struct sctp_ulpevent *ev; | |
101 | ||
102 | ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id, | |
103 | SCTP_AUTH_FREE_KEY, | |
104 | GFP_KERNEL); | |
105 | if (ev) | |
106 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
107 | } | |
1b1e0bc9 | 108 | sctp_auth_shkey_release(chunk->shkey); |
ec2e506c | 109 | } |
072017b4 VY |
110 | } |
111 | ||
112 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
113 | { | |
114 | struct sctp_association *asoc = chunk->asoc; | |
115 | struct sk_buff *skb = chunk->skb; | |
116 | ||
117 | /* TODO: properly account for control chunks. | |
118 | * To do it right we'll need: | |
119 | * 1) endpoint if association isn't known. | |
120 | * 2) proper memory accounting. | |
121 | * | |
122 | * For now don't do anything for now. | |
123 | */ | |
1b1e0bc9 XL |
124 | if (chunk->auth) { |
125 | chunk->shkey = asoc->shkey; | |
126 | sctp_auth_shkey_hold(chunk->shkey); | |
127 | } | |
072017b4 | 128 | skb->sk = asoc ? asoc->base.sk : NULL; |
1b1e0bc9 | 129 | skb_shinfo(skb)->destructor_arg = chunk; |
072017b4 VY |
130 | skb->destructor = sctp_control_release_owner; |
131 | } | |
132 | ||
1da177e4 LT |
133 | /* What was the inbound interface for this chunk? */ |
134 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
135 | { | |
e7487c86 | 136 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 137 | |
e7487c86 | 138 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
139 | } |
140 | ||
141 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
142 | * | |
143 | * Note 2: The ECN capable field is reserved for future use of | |
144 | * Explicit Congestion Notification. | |
145 | */ | |
146 | static const struct sctp_paramhdr ecap_param = { | |
147 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 148 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
149 | }; |
150 | static const struct sctp_paramhdr prsctp_param = { | |
151 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 152 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
153 | }; |
154 | ||
8914f4ba MRL |
155 | /* A helper to initialize an op error inside a provided chunk, as most |
156 | * cause codes will be embedded inside an abort chunk. | |
1da177e4 | 157 | */ |
6d3e8aa8 MRL |
158 | int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
159 | size_t paylen) | |
1da177e4 | 160 | { |
d8238d9d | 161 | struct sctp_errhdr err; |
1da177e4 LT |
162 | __u16 len; |
163 | ||
d808ad9a | 164 | /* Cause code constants are now defined in network order. */ |
1da177e4 | 165 | err.cause = cause_code; |
d8238d9d | 166 | len = sizeof(err) + paylen; |
6d3e8aa8 MRL |
167 | err.length = htons(len); |
168 | ||
169 | if (skb_tailroom(chunk->skb) < len) | |
170 | return -ENOSPC; | |
171 | ||
d8238d9d | 172 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); |
6d3e8aa8 MRL |
173 | |
174 | return 0; | |
1da177e4 LT |
175 | } |
176 | ||
177 | /* 3.3.2 Initiation (INIT) (1) | |
178 | * | |
179 | * This chunk is used to initiate a SCTP association between two | |
180 | * endpoints. The format of the INIT chunk is shown below: | |
181 | * | |
182 | * 0 1 2 3 | |
183 | * 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 | |
184 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
185 | * | Type = 1 | Chunk Flags | Chunk Length | | |
186 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
187 | * | Initiate Tag | | |
188 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
189 | * | Advertised Receiver Window Credit (a_rwnd) | | |
190 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
191 | * | Number of Outbound Streams | Number of Inbound Streams | | |
192 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
193 | * | Initial TSN | | |
194 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
195 | * \ \ | |
196 | * / Optional/Variable-Length Parameters / | |
197 | * \ \ | |
198 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
199 | * | |
200 | * | |
201 | * The INIT chunk contains the following parameters. Unless otherwise | |
202 | * noted, each parameter MUST only be included once in the INIT chunk. | |
203 | * | |
204 | * Fixed Parameters Status | |
205 | * ---------------------------------------------- | |
206 | * Initiate Tag Mandatory | |
207 | * Advertised Receiver Window Credit Mandatory | |
208 | * Number of Outbound Streams Mandatory | |
209 | * Number of Inbound Streams Mandatory | |
210 | * Initial TSN Mandatory | |
211 | * | |
212 | * Variable Parameters Status Type Value | |
213 | * ------------------------------------------------------------- | |
214 | * IPv4 Address (Note 1) Optional 5 | |
215 | * IPv6 Address (Note 1) Optional 6 | |
216 | * Cookie Preservative Optional 9 | |
217 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
218 | * Host Name Address (Note 3) Optional 11 | |
219 | * Supported Address Types (Note 4) Optional 12 | |
220 | */ | |
221 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
327c0dab XL |
222 | const struct sctp_bind_addr *bp, |
223 | gfp_t gfp, int vparam_len) | |
1da177e4 | 224 | { |
e1fc3b14 | 225 | struct net *net = sock_net(asoc->base.sk); |
327c0dab XL |
226 | struct sctp_supported_ext_param ext_param; |
227 | struct sctp_adaptation_ind_param aiparam; | |
228 | struct sctp_paramhdr *auth_chunks = NULL; | |
229 | struct sctp_paramhdr *auth_hmacs = NULL; | |
230 | struct sctp_supported_addrs_param sat; | |
b14878cc | 231 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
232 | struct sctp_chunk *retval = NULL; |
233 | int num_types, addrs_len = 0; | |
327c0dab XL |
234 | struct sctp_inithdr init; |
235 | union sctp_params addrs; | |
1da177e4 | 236 | struct sctp_sock *sp; |
96b120b3 | 237 | __u8 extensions[5]; |
327c0dab | 238 | size_t chunksize; |
3dbe8656 | 239 | __be16 types[2]; |
131a47e3 | 240 | int num_ext = 0; |
1da177e4 LT |
241 | |
242 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
243 | * | |
244 | * Note 1: The INIT chunks can contain multiple addresses that | |
245 | * can be IPv4 and/or IPv6 in any combination. | |
246 | */ | |
1da177e4 LT |
247 | |
248 | /* Convert the provided bind address list to raw format. */ | |
249 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
250 | ||
251 | init.init_tag = htonl(asoc->c.my_vtag); | |
252 | init.a_rwnd = htonl(asoc->rwnd); | |
253 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
254 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
255 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
256 | ||
257 | /* How many address types are needed? */ | |
258 | sp = sctp_sk(asoc->base.sk); | |
259 | num_types = sp->pf->supported_addrs(sp, types); | |
260 | ||
a8170c35 | 261 | chunksize = sizeof(init) + addrs_len; |
e2f036a9 | 262 | chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); |
1da177e4 | 263 | chunksize += sizeof(ecap_param); |
8ee4be37 | 264 | |
28aa4c26 | 265 | if (asoc->prsctp_enable) |
036b579b VY |
266 | chunksize += sizeof(prsctp_param); |
267 | ||
131a47e3 VY |
268 | /* ADDIP: Section 4.2.7: |
269 | * An implementation supporting this extension [ADDIP] MUST list | |
270 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
271 | * INIT-ACK parameters. | |
131a47e3 | 272 | */ |
e1fc3b14 | 273 | if (net->sctp.addip_enable) { |
131a47e3 VY |
274 | extensions[num_ext] = SCTP_CID_ASCONF; |
275 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
276 | num_ext += 2; | |
277 | } | |
278 | ||
c28445c3 XL |
279 | if (asoc->reconf_enable) { |
280 | extensions[num_ext] = SCTP_CID_RECONF; | |
281 | num_ext += 1; | |
282 | } | |
283 | ||
6fc791ee | 284 | if (sp->adaptation_ind) |
285 | chunksize += sizeof(aiparam); | |
286 | ||
96b120b3 XL |
287 | if (sp->strm_interleave) { |
288 | extensions[num_ext] = SCTP_CID_I_DATA; | |
289 | num_ext += 1; | |
290 | } | |
291 | ||
1da177e4 LT |
292 | chunksize += vparam_len; |
293 | ||
730fc3d0 | 294 | /* Account for AUTH related parameters */ |
b14878cc | 295 | if (ep->auth_enable) { |
730fc3d0 VY |
296 | /* Add random parameter length*/ |
297 | chunksize += sizeof(asoc->c.auth_random); | |
298 | ||
299 | /* Add HMACS parameter length if any were defined */ | |
3c918704 | 300 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 301 | if (auth_hmacs->length) |
e2f036a9 | 302 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
303 | else |
304 | auth_hmacs = NULL; | |
305 | ||
306 | /* Add CHUNKS parameter length */ | |
3c918704 | 307 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 308 | if (auth_chunks->length) |
e2f036a9 | 309 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 | 310 | else |
9baffaa6 | 311 | auth_chunks = NULL; |
730fc3d0 VY |
312 | |
313 | extensions[num_ext] = SCTP_CID_AUTH; | |
314 | num_ext += 1; | |
315 | } | |
316 | ||
131a47e3 VY |
317 | /* If we have any extensions to report, account for that */ |
318 | if (num_ext) | |
15328d9f | 319 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
131a47e3 | 320 | |
1da177e4 LT |
321 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
322 | * | |
323 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
324 | * Name address parameter. Moreover, the sender of the INIT | |
325 | * MUST NOT combine any other address types with the Host Name | |
326 | * address in the INIT. The receiver of INIT MUST ignore any | |
327 | * other address types if the Host Name address parameter is | |
328 | * present in the received INIT chunk. | |
329 | * | |
330 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
331 | */ | |
332 | ||
cea8768f | 333 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); |
1da177e4 LT |
334 | if (!retval) |
335 | goto nodata; | |
336 | ||
337 | retval->subh.init_hdr = | |
338 | sctp_addto_chunk(retval, sizeof(init), &init); | |
339 | retval->param_hdr.v = | |
340 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
341 | ||
342 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
343 | * | |
344 | * Note 4: This parameter, when present, specifies all the | |
345 | * address types the sending endpoint can support. The absence | |
346 | * of this parameter indicates that the sending endpoint can | |
347 | * support any address type. | |
348 | */ | |
349 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
350 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
351 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
352 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
353 | ||
354 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 355 | |
7aa1b54b | 356 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
357 | * fist before addiding the parameters for the extensions themselves |
358 | */ | |
359 | if (num_ext) { | |
360 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
361 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
362 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 363 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
364 | } |
365 | ||
28aa4c26 | 366 | if (asoc->prsctp_enable) |
1da177e4 | 367 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 368 | |
6fc791ee | 369 | if (sp->adaptation_ind) { |
370 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
371 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
372 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
373 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
374 | } | |
131a47e3 | 375 | |
730fc3d0 | 376 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 377 | if (ep->auth_enable) { |
730fc3d0 VY |
378 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
379 | asoc->c.auth_random); | |
380 | if (auth_hmacs) | |
381 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
382 | auth_hmacs); | |
383 | if (auth_chunks) | |
384 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
385 | auth_chunks); | |
386 | } | |
1da177e4 | 387 | nodata: |
a51482bd | 388 | kfree(addrs.v); |
1da177e4 LT |
389 | return retval; |
390 | } | |
391 | ||
392 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
327c0dab XL |
393 | const struct sctp_chunk *chunk, |
394 | gfp_t gfp, int unkparam_len) | |
1da177e4 | 395 | { |
327c0dab XL |
396 | struct sctp_supported_ext_param ext_param; |
397 | struct sctp_adaptation_ind_param aiparam; | |
398 | struct sctp_paramhdr *auth_chunks = NULL; | |
399 | struct sctp_paramhdr *auth_random = NULL; | |
400 | struct sctp_paramhdr *auth_hmacs = NULL; | |
401 | struct sctp_chunk *retval = NULL; | |
402 | struct sctp_cookie_param *cookie; | |
4ae70c08 | 403 | struct sctp_inithdr initack; |
1da177e4 | 404 | union sctp_params addrs; |
6fc791ee | 405 | struct sctp_sock *sp; |
96b120b3 | 406 | __u8 extensions[5]; |
1da177e4 | 407 | size_t chunksize; |
131a47e3 | 408 | int num_ext = 0; |
327c0dab XL |
409 | int cookie_len; |
410 | int addrs_len; | |
1da177e4 LT |
411 | |
412 | /* Note: there may be no addresses to embed. */ | |
413 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
414 | ||
415 | initack.init_tag = htonl(asoc->c.my_vtag); | |
416 | initack.a_rwnd = htonl(asoc->rwnd); | |
417 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
418 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
419 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
420 | ||
421 | /* FIXME: We really ought to build the cookie right | |
422 | * into the packet instead of allocating more fresh memory. | |
423 | */ | |
424 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
425 | addrs.v, addrs_len); | |
426 | if (!cookie) | |
427 | goto nomem_cookie; | |
428 | ||
429 | /* Calculate the total size of allocation, include the reserved | |
430 | * space for reporting unknown parameters if it is specified. | |
431 | */ | |
6fc791ee | 432 | sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
433 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
434 | ||
d808ad9a | 435 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
436 | if (asoc->peer.ecn_capable) |
437 | chunksize += sizeof(ecap_param); | |
438 | ||
5ffad5ac | 439 | if (asoc->peer.prsctp_capable) |
036b579b VY |
440 | chunksize += sizeof(prsctp_param); |
441 | ||
5ffad5ac | 442 | if (asoc->peer.asconf_capable) { |
131a47e3 VY |
443 | extensions[num_ext] = SCTP_CID_ASCONF; |
444 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
445 | num_ext += 2; | |
446 | } | |
447 | ||
c28445c3 XL |
448 | if (asoc->peer.reconf_capable) { |
449 | extensions[num_ext] = SCTP_CID_RECONF; | |
450 | num_ext += 1; | |
451 | } | |
452 | ||
6fc791ee | 453 | if (sp->adaptation_ind) |
454 | chunksize += sizeof(aiparam); | |
1da177e4 | 455 | |
96b120b3 XL |
456 | if (asoc->intl_enable) { |
457 | extensions[num_ext] = SCTP_CID_I_DATA; | |
458 | num_ext += 1; | |
459 | } | |
460 | ||
730fc3d0 | 461 | if (asoc->peer.auth_capable) { |
3c918704 | 462 | auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; |
730fc3d0 VY |
463 | chunksize += ntohs(auth_random->length); |
464 | ||
3c918704 | 465 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 466 | if (auth_hmacs->length) |
e2f036a9 | 467 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
468 | else |
469 | auth_hmacs = NULL; | |
470 | ||
3c918704 | 471 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 472 | if (auth_chunks->length) |
e2f036a9 | 473 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 VY |
474 | else |
475 | auth_chunks = NULL; | |
476 | ||
477 | extensions[num_ext] = SCTP_CID_AUTH; | |
478 | num_ext += 1; | |
479 | } | |
480 | ||
8ee4be37 | 481 | if (num_ext) |
15328d9f | 482 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
8ee4be37 | 483 | |
1da177e4 | 484 | /* Now allocate and fill out the chunk. */ |
cea8768f | 485 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
486 | if (!retval) |
487 | goto nomem_chunk; | |
488 | ||
b99a4d53 DC |
489 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
490 | * | |
491 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
492 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
493 | * address from which it received the DATA or control chunk | |
494 | * to which it is replying. | |
495 | * | |
496 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 LT |
497 | */ |
498 | retval->transport = chunk->transport; | |
b99a4d53 | 499 | |
1da177e4 LT |
500 | retval->subh.init_hdr = |
501 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
502 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
503 | sctp_addto_chunk(retval, cookie_len, cookie); | |
504 | if (asoc->peer.ecn_capable) | |
505 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
506 | if (num_ext) { |
507 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
508 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
509 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 510 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 511 | } |
1da177e4 LT |
512 | if (asoc->peer.prsctp_capable) |
513 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
514 | ||
6fc791ee | 515 | if (sp->adaptation_ind) { |
516 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
517 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
518 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
519 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
520 | } | |
1da177e4 | 521 | |
730fc3d0 VY |
522 | if (asoc->peer.auth_capable) { |
523 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
524 | auth_random); | |
525 | if (auth_hmacs) | |
526 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
527 | auth_hmacs); | |
528 | if (auth_chunks) | |
529 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
530 | auth_chunks); | |
531 | } | |
532 | ||
1da177e4 LT |
533 | /* We need to remove the const qualifier at this point. */ |
534 | retval->asoc = (struct sctp_association *) asoc; | |
535 | ||
1da177e4 LT |
536 | nomem_chunk: |
537 | kfree(cookie); | |
538 | nomem_cookie: | |
a51482bd | 539 | kfree(addrs.v); |
1da177e4 LT |
540 | return retval; |
541 | } | |
542 | ||
543 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
544 | * | |
545 | * This chunk is used only during the initialization of an association. | |
546 | * It is sent by the initiator of an association to its peer to complete | |
547 | * the initialization process. This chunk MUST precede any DATA chunk | |
548 | * sent within the association, but MAY be bundled with one or more DATA | |
549 | * chunks in the same packet. | |
550 | * | |
551 | * 0 1 2 3 | |
552 | * 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 | |
553 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
554 | * | Type = 10 |Chunk Flags | Length | | |
555 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
556 | * / Cookie / | |
557 | * \ \ | |
558 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
559 | * | |
560 | * Chunk Flags: 8 bit | |
561 | * | |
562 | * Set to zero on transmit and ignored on receipt. | |
563 | * | |
564 | * Length: 16 bits (unsigned integer) | |
565 | * | |
566 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
567 | * the chunk header and the size of the Cookie. | |
568 | * | |
569 | * Cookie: variable size | |
570 | * | |
571 | * This field must contain the exact cookie received in the | |
572 | * State Cookie parameter from the previous INIT ACK. | |
573 | * | |
574 | * An implementation SHOULD make the cookie as small as possible | |
575 | * to insure interoperability. | |
576 | */ | |
577 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
327c0dab | 578 | const struct sctp_chunk *chunk) |
1da177e4 LT |
579 | { |
580 | struct sctp_chunk *retval; | |
1da177e4 | 581 | int cookie_len; |
327c0dab | 582 | void *cookie; |
1da177e4 LT |
583 | |
584 | cookie = asoc->peer.cookie; | |
585 | cookie_len = asoc->peer.cookie_len; | |
586 | ||
587 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
588 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
589 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
590 | if (!retval) |
591 | goto nodata; | |
592 | retval->subh.cookie_hdr = | |
593 | sctp_addto_chunk(retval, cookie_len, cookie); | |
594 | ||
595 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
596 | * | |
597 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
598 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
599 | * address from which it * received the DATA or control chunk | |
600 | * to which it is replying. | |
601 | * | |
602 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
603 | */ | |
604 | if (chunk) | |
605 | retval->transport = chunk->transport; | |
606 | ||
607 | nodata: | |
608 | return retval; | |
609 | } | |
610 | ||
611 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
612 | * | |
613 | * This chunk is used only during the initialization of an | |
614 | * association. It is used to acknowledge the receipt of a COOKIE | |
615 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
616 | * within the association, but MAY be bundled with one or more DATA | |
617 | * chunks or SACK chunk in the same SCTP packet. | |
618 | * | |
619 | * 0 1 2 3 | |
620 | * 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 | |
621 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
622 | * | Type = 11 |Chunk Flags | Length = 4 | | |
623 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
624 | * | |
625 | * Chunk Flags: 8 bits | |
626 | * | |
627 | * Set to zero on transmit and ignored on receipt. | |
628 | */ | |
629 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
327c0dab | 630 | const struct sctp_chunk *chunk) |
1da177e4 LT |
631 | { |
632 | struct sctp_chunk *retval; | |
633 | ||
cea8768f | 634 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
635 | |
636 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
637 | * | |
638 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
639 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
640 | * address from which it * received the DATA or control chunk | |
641 | * to which it is replying. | |
642 | * | |
643 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
644 | */ | |
645 | if (retval && chunk) | |
646 | retval->transport = chunk->transport; | |
647 | ||
648 | return retval; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Appendix A: Explicit Congestion Notification: | |
653 | * CWR: | |
654 | * | |
655 | * RFC 2481 details a specific bit for a sender to send in the header of | |
656 | * its next outbound TCP segment to indicate to its peer that it has | |
657 | * reduced its congestion window. This is termed the CWR bit. For | |
658 | * SCTP the same indication is made by including the CWR chunk. | |
659 | * This chunk contains one data element, i.e. the TSN number that | |
660 | * was sent in the ECNE chunk. This element represents the lowest | |
661 | * TSN number in the datagram that was originally marked with the | |
662 | * CE bit. | |
663 | * | |
664 | * 0 1 2 3 | |
665 | * 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 | |
666 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
667 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
668 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
669 | * | Lowest TSN Number | | |
670 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
671 | * | |
672 | * Note: The CWR is considered a Control chunk. | |
673 | */ | |
674 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
327c0dab XL |
675 | const __u32 lowest_tsn, |
676 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
677 | { |
678 | struct sctp_chunk *retval; | |
65f77105 | 679 | struct sctp_cwrhdr cwr; |
1da177e4 LT |
680 | |
681 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 682 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
65f77105 | 683 | sizeof(cwr), GFP_ATOMIC); |
1da177e4 LT |
684 | |
685 | if (!retval) | |
686 | goto nodata; | |
687 | ||
688 | retval->subh.ecn_cwr_hdr = | |
689 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
690 | ||
691 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
692 | * | |
693 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
694 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
695 | * address from which it * received the DATA or control chunk | |
696 | * to which it is replying. | |
697 | * | |
698 | * [Report a reduced congestion window back to where the ECNE | |
699 | * came from.] | |
700 | */ | |
701 | if (chunk) | |
702 | retval->transport = chunk->transport; | |
703 | ||
704 | nodata: | |
705 | return retval; | |
706 | } | |
707 | ||
708 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
709 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
327c0dab | 710 | const __u32 lowest_tsn) |
1da177e4 LT |
711 | { |
712 | struct sctp_chunk *retval; | |
1fb6d83b | 713 | struct sctp_ecnehdr ecne; |
1da177e4 LT |
714 | |
715 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 716 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
1fb6d83b | 717 | sizeof(ecne), GFP_ATOMIC); |
1da177e4 LT |
718 | if (!retval) |
719 | goto nodata; | |
720 | retval->subh.ecne_hdr = | |
721 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
722 | ||
723 | nodata: | |
724 | return retval; | |
725 | } | |
726 | ||
727 | /* Make a DATA chunk for the given association from the provided | |
728 | * parameters. However, do not populate the data payload. | |
729 | */ | |
0c3f6f65 | 730 | struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, |
327c0dab | 731 | const struct sctp_sndrcvinfo *sinfo, |
0c3f6f65 | 732 | int len, __u8 flags, gfp_t gfp) |
1da177e4 LT |
733 | { |
734 | struct sctp_chunk *retval; | |
735 | struct sctp_datahdr dp; | |
1da177e4 LT |
736 | |
737 | /* We assign the TSN as LATE as possible, not here when | |
738 | * creating the chunk. | |
739 | */ | |
0c3f6f65 XL |
740 | memset(&dp, 0, sizeof(dp)); |
741 | dp.ppid = sinfo->sinfo_ppid; | |
1da177e4 | 742 | dp.stream = htons(sinfo->sinfo_stream); |
1da177e4 LT |
743 | |
744 | /* Set the flags for an unordered send. */ | |
0c3f6f65 | 745 | if (sinfo->sinfo_flags & SCTP_UNORDERED) |
1da177e4 | 746 | flags |= SCTP_DATA_UNORDERED; |
1da177e4 | 747 | |
0c3f6f65 | 748 | retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); |
1da177e4 | 749 | if (!retval) |
0c3f6f65 | 750 | return NULL; |
1da177e4 LT |
751 | |
752 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
753 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
754 | ||
1da177e4 LT |
755 | return retval; |
756 | } | |
757 | ||
758 | /* Create a selective ackowledgement (SACK) for the given | |
759 | * association. This reports on which TSN's we've seen to date, | |
760 | * including duplicates and gaps. | |
761 | */ | |
47b3ba51 | 762 | struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc) |
1da177e4 | 763 | { |
1da177e4 | 764 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
02015180 | 765 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
327c0dab | 766 | __u16 num_gabs, num_dup_tsns; |
4244854d | 767 | struct sctp_transport *trans; |
327c0dab XL |
768 | struct sctp_chunk *retval; |
769 | struct sctp_sackhdr sack; | |
770 | __u32 ctsn; | |
771 | int len; | |
1da177e4 | 772 | |
02015180 | 773 | memset(gabs, 0, sizeof(gabs)); |
1da177e4 | 774 | ctsn = sctp_tsnmap_get_ctsn(map); |
bb33381d DB |
775 | |
776 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); | |
1da177e4 LT |
777 | |
778 | /* How much room is needed in the chunk? */ | |
02015180 | 779 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
1da177e4 LT |
780 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
781 | ||
782 | /* Initialize the SACK header. */ | |
783 | sack.cum_tsn_ack = htonl(ctsn); | |
784 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
785 | sack.num_gap_ack_blocks = htons(num_gabs); | |
786 | sack.num_dup_tsns = htons(num_dup_tsns); | |
787 | ||
788 | len = sizeof(sack) | |
789 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
790 | + sizeof(__u32) * num_dup_tsns; | |
791 | ||
792 | /* Create the chunk. */ | |
cea8768f | 793 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); |
1da177e4 LT |
794 | if (!retval) |
795 | goto nodata; | |
796 | ||
797 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
798 | * | |
799 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
800 | * HEARTBEAT ACK, etc.) to the same destination transport | |
801 | * address from which it received the DATA or control chunk to | |
802 | * which it is replying. This rule should also be followed if | |
803 | * the endpoint is bundling DATA chunks together with the | |
804 | * reply chunk. | |
805 | * | |
806 | * However, when acknowledging multiple DATA chunks received | |
807 | * in packets from different source addresses in a single | |
808 | * SACK, the SACK chunk may be transmitted to one of the | |
809 | * destination transport addresses from which the DATA or | |
810 | * control chunks being acknowledged were received. | |
811 | * | |
812 | * [BUG: We do not implement the following paragraph. | |
813 | * Perhaps we should remember the last transport we used for a | |
814 | * SACK and avoid that (if possible) if we have seen any | |
815 | * duplicates. --piggy] | |
816 | * | |
817 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
818 | * multi- homed endpoint it MAY be beneficial to vary the | |
819 | * destination address and not use the source address of the | |
820 | * DATA chunk. The reason being that receiving a duplicate | |
821 | * from a multi-homed endpoint might indicate that the return | |
822 | * path (as specified in the source address of the DATA chunk) | |
823 | * for the SACK is broken. | |
824 | * | |
825 | * [Send to the address from which we last received a DATA chunk.] | |
826 | */ | |
827 | retval->transport = asoc->peer.last_data_from; | |
828 | ||
829 | retval->subh.sack_hdr = | |
830 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
831 | ||
832 | /* Add the gap ack block information. */ | |
833 | if (num_gabs) | |
834 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
02015180 | 835 | gabs); |
1da177e4 LT |
836 | |
837 | /* Add the duplicate TSN information. */ | |
196d6759 | 838 | if (num_dup_tsns) { |
47b3ba51 | 839 | asoc->stats.idupchunks += num_dup_tsns; |
1da177e4 LT |
840 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
841 | sctp_tsnmap_get_dups(map)); | |
196d6759 | 842 | } |
4244854d NH |
843 | /* Once we have a sack generated, check to see what our sack |
844 | * generation is, if its 0, reset the transports to 0, and reset | |
845 | * the association generation to 1 | |
846 | * | |
847 | * The idea is that zero is never used as a valid generation for the | |
848 | * association so no transport will match after a wrap event like this, | |
849 | * Until the next sack | |
850 | */ | |
47b3ba51 | 851 | if (++asoc->peer.sack_generation == 0) { |
4244854d NH |
852 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
853 | transports) | |
854 | trans->sack_generation = 0; | |
47b3ba51 | 855 | asoc->peer.sack_generation = 1; |
4244854d | 856 | } |
1da177e4 LT |
857 | nodata: |
858 | return retval; | |
859 | } | |
860 | ||
861 | /* Make a SHUTDOWN chunk. */ | |
862 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
863 | const struct sctp_chunk *chunk) | |
864 | { | |
e61e4055 | 865 | struct sctp_shutdownhdr shut; |
1da177e4 | 866 | struct sctp_chunk *retval; |
1da177e4 LT |
867 | __u32 ctsn; |
868 | ||
869 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
870 | shut.cum_tsn_ack = htonl(ctsn); | |
871 | ||
072017b4 | 872 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
e61e4055 | 873 | sizeof(shut), GFP_ATOMIC); |
1da177e4 LT |
874 | if (!retval) |
875 | goto nodata; | |
876 | ||
877 | retval->subh.shutdown_hdr = | |
878 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
879 | ||
880 | if (chunk) | |
881 | retval->transport = chunk->transport; | |
882 | nodata: | |
883 | return retval; | |
884 | } | |
885 | ||
886 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
327c0dab | 887 | const struct sctp_chunk *chunk) |
1da177e4 LT |
888 | { |
889 | struct sctp_chunk *retval; | |
890 | ||
cea8768f MRL |
891 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
892 | GFP_ATOMIC); | |
1da177e4 LT |
893 | |
894 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
895 | * | |
896 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
897 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
898 | * address from which it * received the DATA or control chunk | |
899 | * to which it is replying. | |
900 | * | |
901 | * [ACK back to where the SHUTDOWN came from.] | |
902 | */ | |
903 | if (retval && chunk) | |
904 | retval->transport = chunk->transport; | |
905 | ||
906 | return retval; | |
907 | } | |
908 | ||
909 | struct sctp_chunk *sctp_make_shutdown_complete( | |
327c0dab XL |
910 | const struct sctp_association *asoc, |
911 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
912 | { |
913 | struct sctp_chunk *retval; | |
914 | __u8 flags = 0; | |
915 | ||
047a2428 JF |
916 | /* Set the T-bit if we have no association (vtag will be |
917 | * reflected) | |
918 | */ | |
1da177e4 LT |
919 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
920 | ||
cea8768f MRL |
921 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
922 | 0, GFP_ATOMIC); | |
1da177e4 LT |
923 | |
924 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
925 | * | |
926 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
927 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
928 | * address from which it * received the DATA or control chunk | |
929 | * to which it is replying. | |
930 | * | |
931 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
932 | * came from.] | |
933 | */ | |
934 | if (retval && chunk) | |
935 | retval->transport = chunk->transport; | |
936 | ||
d808ad9a | 937 | return retval; |
1da177e4 LT |
938 | } |
939 | ||
940 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 941 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
942 | */ |
943 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
327c0dab XL |
944 | const struct sctp_chunk *chunk, |
945 | const size_t hint) | |
1da177e4 LT |
946 | { |
947 | struct sctp_chunk *retval; | |
948 | __u8 flags = 0; | |
949 | ||
047a2428 JF |
950 | /* Set the T-bit if we have no association and 'chunk' is not |
951 | * an INIT (vtag will be reflected). | |
952 | */ | |
953 | if (!asoc) { | |
954 | if (chunk && chunk->chunk_hdr && | |
955 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
956 | flags = 0; | |
957 | else | |
958 | flags = SCTP_CHUNK_FLAG_T; | |
959 | } | |
1da177e4 | 960 | |
cea8768f MRL |
961 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
962 | GFP_ATOMIC); | |
1da177e4 LT |
963 | |
964 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
965 | * | |
966 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
967 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
968 | * address from which it * received the DATA or control chunk | |
969 | * to which it is replying. | |
970 | * | |
971 | * [ABORT back to where the offender came from.] | |
972 | */ | |
973 | if (retval && chunk) | |
974 | retval->transport = chunk->transport; | |
975 | ||
976 | return retval; | |
977 | } | |
978 | ||
979 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
980 | struct sctp_chunk *sctp_make_abort_no_data( | |
327c0dab XL |
981 | const struct sctp_association *asoc, |
982 | const struct sctp_chunk *chunk, | |
983 | __u32 tsn) | |
1da177e4 LT |
984 | { |
985 | struct sctp_chunk *retval; | |
9f81bcd9 | 986 | __be32 payload; |
1da177e4 | 987 | |
d8238d9d XL |
988 | retval = sctp_make_abort(asoc, chunk, |
989 | sizeof(struct sctp_errhdr) + sizeof(tsn)); | |
1da177e4 LT |
990 | |
991 | if (!retval) | |
992 | goto no_mem; | |
993 | ||
994 | /* Put the tsn back into network byte order. */ | |
995 | payload = htonl(tsn); | |
00f1c2df WY |
996 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
997 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
998 | |
999 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1000 | * | |
1001 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1002 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1003 | * address from which it * received the DATA or control chunk | |
1004 | * to which it is replying. | |
1005 | * | |
1006 | * [ABORT back to where the offender came from.] | |
1007 | */ | |
1008 | if (chunk) | |
1009 | retval->transport = chunk->transport; | |
1010 | ||
1011 | no_mem: | |
1012 | return retval; | |
1013 | } | |
1014 | ||
1015 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1016 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1017 | struct msghdr *msg, |
c164a9ba | 1018 | size_t paylen) |
1da177e4 LT |
1019 | { |
1020 | struct sctp_chunk *retval; | |
c164a9ba SS |
1021 | void *payload = NULL; |
1022 | int err; | |
1da177e4 | 1023 | |
d8238d9d XL |
1024 | retval = sctp_make_abort(asoc, NULL, |
1025 | sizeof(struct sctp_errhdr) + paylen); | |
1da177e4 LT |
1026 | if (!retval) |
1027 | goto err_chunk; | |
1028 | ||
1029 | if (paylen) { | |
1030 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1031 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1032 | if (!payload) |
1033 | goto err_payload; | |
c164a9ba | 1034 | |
6ce8e9ce | 1035 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1036 | if (err < 0) |
1037 | goto err_copy; | |
1da177e4 LT |
1038 | } |
1039 | ||
00f1c2df WY |
1040 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1041 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1042 | |
1043 | if (paylen) | |
1044 | kfree(payload); | |
1045 | ||
1046 | return retval; | |
1047 | ||
1048 | err_copy: | |
1049 | kfree(payload); | |
1050 | err_payload: | |
1051 | sctp_chunk_free(retval); | |
1052 | retval = NULL; | |
1053 | err_chunk: | |
1054 | return retval; | |
1055 | } | |
1056 | ||
5c94bf86 AB |
1057 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1058 | * enough. | |
1059 | */ | |
1060 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1061 | const void *data) | |
1062 | { | |
5c94bf86 | 1063 | int chunklen = ntohs(chunk->chunk_hdr->length); |
327c0dab | 1064 | void *target; |
5c94bf86 AB |
1065 | |
1066 | target = skb_put(chunk->skb, len); | |
1067 | ||
6383cfb3 VY |
1068 | if (data) |
1069 | memcpy(target, data, len); | |
1070 | else | |
1071 | memset(target, 0, len); | |
5c94bf86 AB |
1072 | |
1073 | /* Adjust the chunk length field. */ | |
1074 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1075 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1076 | ||
1077 | return target; | |
1078 | } | |
1079 | ||
d808ad9a | 1080 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 | 1081 | struct sctp_chunk *sctp_make_abort_violation( |
327c0dab XL |
1082 | const struct sctp_association *asoc, |
1083 | const struct sctp_chunk *chunk, | |
1084 | const __u8 *payload, | |
1085 | const size_t paylen) | |
1da177e4 LT |
1086 | { |
1087 | struct sctp_chunk *retval; | |
1088 | struct sctp_paramhdr phdr; | |
1089 | ||
d8238d9d XL |
1090 | retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + |
1091 | paylen + sizeof(phdr)); | |
1da177e4 LT |
1092 | if (!retval) |
1093 | goto end; | |
1094 | ||
3c918704 XL |
1095 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + |
1096 | sizeof(phdr)); | |
1da177e4 LT |
1097 | |
1098 | phdr.type = htons(chunk->chunk_hdr->type); | |
1099 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df | 1100 | sctp_addto_chunk(retval, paylen, payload); |
3c918704 | 1101 | sctp_addto_param(retval, sizeof(phdr), &phdr); |
1da177e4 LT |
1102 | |
1103 | end: | |
1104 | return retval; | |
1105 | } | |
1106 | ||
ba016670 | 1107 | struct sctp_chunk *sctp_make_violation_paramlen( |
327c0dab XL |
1108 | const struct sctp_association *asoc, |
1109 | const struct sctp_chunk *chunk, | |
1110 | struct sctp_paramhdr *param) | |
ba016670 | 1111 | { |
ba016670 | 1112 | static const char error[] = "The following parameter had invalid length:"; |
d8238d9d | 1113 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + |
3c918704 | 1114 | sizeof(*param); |
327c0dab | 1115 | struct sctp_chunk *retval; |
ba016670 WY |
1116 | |
1117 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1118 | if (!retval) | |
1119 | goto nodata; | |
1120 | ||
1121 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
3c918704 | 1122 | sizeof(error) + sizeof(*param)); |
ba016670 | 1123 | sctp_addto_chunk(retval, sizeof(error), error); |
3c918704 | 1124 | sctp_addto_param(retval, sizeof(*param), param); |
ba016670 WY |
1125 | |
1126 | nodata: | |
1127 | return retval; | |
1128 | } | |
1129 | ||
de4594a5 | 1130 | struct sctp_chunk *sctp_make_violation_max_retrans( |
327c0dab XL |
1131 | const struct sctp_association *asoc, |
1132 | const struct sctp_chunk *chunk) | |
de4594a5 | 1133 | { |
39a2d5cb | 1134 | static const char error[] = "Association exceeded its max_retrans count"; |
d8238d9d | 1135 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); |
327c0dab | 1136 | struct sctp_chunk *retval; |
de4594a5 NH |
1137 | |
1138 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1139 | if (!retval) | |
1140 | goto nodata; | |
1141 | ||
1142 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1143 | sctp_addto_chunk(retval, sizeof(error), error); | |
1144 | ||
1145 | nodata: | |
1146 | return retval; | |
1147 | } | |
1148 | ||
1da177e4 LT |
1149 | /* Make a HEARTBEAT chunk. */ |
1150 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
edf903f8 | 1151 | const struct sctp_transport *transport) |
1da177e4 | 1152 | { |
edf903f8 | 1153 | struct sctp_sender_hb_info hbinfo; |
92c73af5 | 1154 | struct sctp_chunk *retval; |
92c73af5 | 1155 | |
cea8768f MRL |
1156 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1157 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1158 | |
1159 | if (!retval) | |
1160 | goto nodata; | |
1161 | ||
92c73af5 | 1162 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
edf903f8 | 1163 | hbinfo.param_hdr.length = htons(sizeof(hbinfo)); |
92c73af5 WY |
1164 | hbinfo.daddr = transport->ipaddr; |
1165 | hbinfo.sent_at = jiffies; | |
1166 | hbinfo.hb_nonce = transport->hb_nonce; | |
1167 | ||
1da177e4 LT |
1168 | /* Cast away the 'const', as this is just telling the chunk |
1169 | * what transport it belongs to. | |
1170 | */ | |
1171 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1172 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1173 | &hbinfo); | |
1da177e4 LT |
1174 | |
1175 | nodata: | |
1176 | return retval; | |
1177 | } | |
1178 | ||
1179 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
327c0dab XL |
1180 | const struct sctp_chunk *chunk, |
1181 | const void *payload, | |
1182 | const size_t paylen) | |
1da177e4 LT |
1183 | { |
1184 | struct sctp_chunk *retval; | |
1185 | ||
cea8768f MRL |
1186 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1187 | GFP_ATOMIC); | |
1da177e4 LT |
1188 | if (!retval) |
1189 | goto nodata; | |
1190 | ||
1191 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1192 | ||
1193 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1194 | * | |
1195 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1196 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1197 | * address from which it * received the DATA or control chunk | |
1198 | * to which it is replying. | |
1199 | * | |
1200 | * [HBACK back to where the HEARTBEAT came from.] | |
1201 | */ | |
1202 | if (chunk) | |
1203 | retval->transport = chunk->transport; | |
1204 | ||
1205 | nodata: | |
1206 | return retval; | |
1207 | } | |
1208 | ||
1209 | /* Create an Operation Error chunk with the specified space reserved. | |
1210 | * This routine can be used for containing multiple causes in the chunk. | |
1211 | */ | |
1212 | static struct sctp_chunk *sctp_make_op_error_space( | |
327c0dab XL |
1213 | const struct sctp_association *asoc, |
1214 | const struct sctp_chunk *chunk, | |
1215 | size_t size) | |
1da177e4 LT |
1216 | { |
1217 | struct sctp_chunk *retval; | |
1218 | ||
072017b4 | 1219 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
d8238d9d XL |
1220 | sizeof(struct sctp_errhdr) + size, |
1221 | GFP_ATOMIC); | |
1da177e4 LT |
1222 | if (!retval) |
1223 | goto nodata; | |
1224 | ||
1225 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1226 | * | |
1227 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1228 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1229 | * address from which it received the DATA or control chunk | |
1230 | * to which it is replying. | |
1231 | * | |
1232 | */ | |
1233 | if (chunk) | |
1234 | retval->transport = chunk->transport; | |
1235 | ||
1236 | nodata: | |
1237 | return retval; | |
1238 | } | |
1239 | ||
8914f4ba MRL |
1240 | /* Create an Operation Error chunk of a fixed size, specifically, |
1241 | * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. | |
1242 | * This is a helper function to allocate an error chunk for for those | |
1243 | * invalid parameter codes in which we may not want to report all the | |
1244 | * errors, if the incoming chunk is large. If it can't fit in a single | |
1245 | * packet, we ignore it. | |
5fa782c2 | 1246 | */ |
8914f4ba | 1247 | static inline struct sctp_chunk *sctp_make_op_error_limited( |
327c0dab XL |
1248 | const struct sctp_association *asoc, |
1249 | const struct sctp_chunk *chunk) | |
5fa782c2 | 1250 | { |
8914f4ba MRL |
1251 | size_t size = SCTP_DEFAULT_MAXSEGMENT; |
1252 | struct sctp_sock *sp = NULL; | |
1253 | ||
1254 | if (asoc) { | |
1255 | size = min_t(size_t, size, asoc->pathmtu); | |
1256 | sp = sctp_sk(asoc->base.sk); | |
1257 | } | |
5fa782c2 | 1258 | |
8914f4ba | 1259 | size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); |
5fa782c2 NH |
1260 | |
1261 | return sctp_make_op_error_space(asoc, chunk, size); | |
1262 | } | |
1263 | ||
1da177e4 LT |
1264 | /* Create an Operation Error chunk. */ |
1265 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
327c0dab XL |
1266 | const struct sctp_chunk *chunk, |
1267 | __be16 cause_code, const void *payload, | |
1268 | size_t paylen, size_t reserve_tail) | |
1da177e4 LT |
1269 | { |
1270 | struct sctp_chunk *retval; | |
1271 | ||
6383cfb3 | 1272 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1273 | if (!retval) |
1274 | goto nodata; | |
1275 | ||
6383cfb3 | 1276 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1277 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1278 | if (reserve_tail) |
1279 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1280 | |
1281 | nodata: | |
1282 | return retval; | |
1283 | } | |
1284 | ||
1b1e0bc9 XL |
1285 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, |
1286 | __u16 key_id) | |
4cd57c80 | 1287 | { |
4cd57c80 | 1288 | struct sctp_authhdr auth_hdr; |
327c0dab XL |
1289 | struct sctp_hmac *hmac_desc; |
1290 | struct sctp_chunk *retval; | |
4cd57c80 VY |
1291 | |
1292 | /* Get the first hmac that the peer told us to use */ | |
1293 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1294 | if (unlikely(!hmac_desc)) | |
1295 | return NULL; | |
1296 | ||
072017b4 | 1297 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
96f7ef4d XL |
1298 | hmac_desc->hmac_len + sizeof(auth_hdr), |
1299 | GFP_ATOMIC); | |
4cd57c80 VY |
1300 | if (!retval) |
1301 | return NULL; | |
1302 | ||
1303 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1b1e0bc9 | 1304 | auth_hdr.shkey_id = htons(key_id); |
4cd57c80 | 1305 | |
96f7ef4d XL |
1306 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), |
1307 | &auth_hdr); | |
4cd57c80 | 1308 | |
594831a8 | 1309 | skb_put_zero(retval->skb, hmac_desc->hmac_len); |
4cd57c80 VY |
1310 | |
1311 | /* Adjust the chunk header to include the empty MAC */ | |
1312 | retval->chunk_hdr->length = | |
1313 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1314 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1315 | ||
1316 | return retval; | |
1317 | } | |
1318 | ||
1319 | ||
1da177e4 LT |
1320 | /******************************************************************** |
1321 | * 2nd Level Abstractions | |
1322 | ********************************************************************/ | |
1323 | ||
1324 | /* Turn an skb into a chunk. | |
1325 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1326 | * |
1327 | * sctpimpguide-05.txt Section 2.8.2 | |
1328 | * M1) Each time a new DATA chunk is transmitted | |
1329 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1330 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1331 | * and when to fast retransmit. | |
1332 | * | |
1da177e4 LT |
1333 | */ |
1334 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
327c0dab XL |
1335 | const struct sctp_association *asoc, |
1336 | struct sock *sk, gfp_t gfp) | |
1da177e4 LT |
1337 | { |
1338 | struct sctp_chunk *retval; | |
1339 | ||
cea8768f | 1340 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1341 | |
1342 | if (!retval) | |
1343 | goto nodata; | |
bb33381d DB |
1344 | if (!sk) |
1345 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1346 | |
79af02c2 | 1347 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1348 | retval->skb = skb; |
1349 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1350 | retval->singleton = 1; |
1da177e4 | 1351 | |
3dc0a548 | 1352 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1353 | |
1354 | /* Polish the bead hole. */ | |
1355 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1356 | INIT_LIST_HEAD(&retval->frag_list); | |
1357 | SCTP_DBG_OBJCNT_INC(chunk); | |
e7f02796 | 1358 | refcount_set(&retval->refcnt, 1); |
1da177e4 LT |
1359 | |
1360 | nodata: | |
1361 | return retval; | |
1362 | } | |
1363 | ||
1364 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1365 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1366 | union sctp_addr *dest) | |
1367 | { | |
f235fca3 | 1368 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1369 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* Extract the source address from a chunk. */ | |
1373 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1374 | { | |
1375 | /* If we have a known transport, use that. */ | |
1376 | if (chunk->transport) { | |
6a1e5f33 | 1377 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1378 | } else { |
1379 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1380 | return &chunk->source; |
1da177e4 LT |
1381 | } |
1382 | } | |
1383 | ||
1384 | /* Create a new chunk, setting the type and flags headers from the | |
1385 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1386 | */ | |
072017b4 | 1387 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
327c0dab XL |
1388 | __u8 type, __u8 flags, int paylen, |
1389 | gfp_t gfp) | |
1da177e4 | 1390 | { |
922dbc5b | 1391 | struct sctp_chunkhdr *chunk_hdr; |
327c0dab | 1392 | struct sctp_chunk *retval; |
1da177e4 LT |
1393 | struct sk_buff *skb; |
1394 | struct sock *sk; | |
07f2c7ab AK |
1395 | int chunklen; |
1396 | ||
1397 | chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); | |
1398 | if (chunklen > SCTP_MAX_CHUNK_LEN) | |
1399 | goto nodata; | |
1da177e4 LT |
1400 | |
1401 | /* No need to allocate LL here, as this is only a chunk. */ | |
07f2c7ab | 1402 | skb = alloc_skb(chunklen, gfp); |
1da177e4 LT |
1403 | if (!skb) |
1404 | goto nodata; | |
1405 | ||
1406 | /* Make room for the chunk header. */ | |
922dbc5b | 1407 | chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); |
1da177e4 LT |
1408 | chunk_hdr->type = type; |
1409 | chunk_hdr->flags = flags; | |
922dbc5b | 1410 | chunk_hdr->length = htons(sizeof(*chunk_hdr)); |
1da177e4 LT |
1411 | |
1412 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1413 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1414 | if (!retval) { |
1415 | kfree_skb(skb); | |
1416 | goto nodata; | |
1417 | } | |
1418 | ||
1419 | retval->chunk_hdr = chunk_hdr; | |
922dbc5b | 1420 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); |
1da177e4 | 1421 | |
4cd57c80 VY |
1422 | /* Determine if the chunk needs to be authenticated */ |
1423 | if (sctp_auth_send_cid(type, asoc)) | |
1424 | retval->auth = 1; | |
1425 | ||
1da177e4 LT |
1426 | return retval; |
1427 | nodata: | |
1428 | return NULL; | |
1429 | } | |
1430 | ||
072017b4 | 1431 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1432 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1433 | { |
cea8768f | 1434 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1435 | } |
1436 | ||
ad05a7a0 XL |
1437 | struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, |
1438 | __u8 flags, int paylen, gfp_t gfp) | |
1439 | { | |
1440 | return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); | |
1441 | } | |
1442 | ||
072017b4 | 1443 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
1444 | __u8 type, __u8 flags, int paylen, |
1445 | gfp_t gfp) | |
072017b4 | 1446 | { |
cea8768f | 1447 | struct sctp_chunk *chunk; |
072017b4 | 1448 | |
cea8768f | 1449 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1450 | if (chunk) |
1451 | sctp_control_set_owner_w(chunk); | |
1452 | ||
1453 | return chunk; | |
1454 | } | |
1da177e4 LT |
1455 | |
1456 | /* Release the memory occupied by a chunk. */ | |
1457 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1458 | { | |
a08de64d VY |
1459 | BUG_ON(!list_empty(&chunk->list)); |
1460 | list_del_init(&chunk->transmitted_list); | |
1461 | ||
c485658b DB |
1462 | consume_skb(chunk->skb); |
1463 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1464 | |
1465 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1466 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1467 | } | |
1468 | ||
1469 | /* Possibly, free the chunk. */ | |
1470 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1471 | { | |
1da177e4 LT |
1472 | /* Release our reference on the message tracker. */ |
1473 | if (chunk->msg) | |
1474 | sctp_datamsg_put(chunk->msg); | |
1475 | ||
1476 | sctp_chunk_put(chunk); | |
1477 | } | |
1478 | ||
1479 | /* Grab a reference to the chunk. */ | |
1480 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1481 | { | |
e7f02796 | 1482 | refcount_inc(&ch->refcnt); |
1da177e4 LT |
1483 | } |
1484 | ||
1485 | /* Release a reference to the chunk. */ | |
1486 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1487 | { | |
e7f02796 | 1488 | if (refcount_dec_and_test(&ch->refcnt)) |
1da177e4 LT |
1489 | sctp_chunk_destroy(ch); |
1490 | } | |
1491 | ||
1492 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1493 | * enough. | |
1494 | */ | |
1495 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1496 | { | |
1da177e4 | 1497 | int chunklen = ntohs(chunk->chunk_hdr->length); |
e2f036a9 | 1498 | int padlen = SCTP_PAD4(chunklen) - chunklen; |
327c0dab | 1499 | void *target; |
1da177e4 | 1500 | |
b952f4df | 1501 | skb_put_zero(chunk->skb, padlen); |
59ae1d12 | 1502 | target = skb_put_data(chunk->skb, data, len); |
1da177e4 LT |
1503 | |
1504 | /* Adjust the chunk length field. */ | |
1505 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1506 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1507 | |
1508 | return target; | |
1509 | } | |
1510 | ||
1511 | /* Append bytes from user space to the end of a chunk. Will panic if | |
1512 | * chunk is not big enough. | |
1513 | * Returns a kernel err value. | |
1514 | */ | |
e0eb093e AV |
1515 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1516 | struct iov_iter *from) | |
1da177e4 | 1517 | { |
e0eb093e | 1518 | void *target; |
1da177e4 LT |
1519 | |
1520 | /* Make room in chunk for data. */ | |
1521 | target = skb_put(chunk->skb, len); | |
1522 | ||
1523 | /* Copy data (whole iovec) into chunk */ | |
3b6d4dbf | 1524 | if (!copy_from_iter_full(target, len, from)) |
e0eb093e | 1525 | return -EFAULT; |
1da177e4 LT |
1526 | |
1527 | /* Adjust the chunk length field. */ | |
1528 | chunk->chunk_hdr->length = | |
1529 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1530 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1531 | |
e0eb093e | 1532 | return 0; |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | /* Helper function to assign a TSN if needed. This assumes that both | |
1536 | * the data_hdr and association have already been assigned. | |
1537 | */ | |
1538 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1539 | { | |
ab3e5e7b | 1540 | struct sctp_stream *stream; |
327c0dab XL |
1541 | struct sctp_chunk *lchunk; |
1542 | struct sctp_datamsg *msg; | |
1543 | __u16 ssn, sid; | |
1da177e4 LT |
1544 | |
1545 | if (chunk->has_ssn) | |
1546 | return; | |
1547 | ||
ab3e5e7b VY |
1548 | /* All fragments will be on the same stream */ |
1549 | sid = ntohs(chunk->subh.data_hdr->stream); | |
cee360ab | 1550 | stream = &chunk->asoc->stream; |
1da177e4 | 1551 | |
ab3e5e7b VY |
1552 | /* Now assign the sequence number to the entire message. |
1553 | * All fragments must have the same stream sequence number. | |
1554 | */ | |
1555 | msg = chunk->msg; | |
1556 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1557 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1558 | ssn = 0; | |
1559 | } else { | |
1560 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
a8386317 | 1561 | ssn = sctp_ssn_next(stream, out, sid); |
ab3e5e7b | 1562 | else |
a8386317 | 1563 | ssn = sctp_ssn_peek(stream, out, sid); |
ab3e5e7b VY |
1564 | } |
1565 | ||
1566 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1567 | lchunk->has_ssn = 1; | |
1568 | } | |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | /* Helper function to assign a TSN if needed. This assumes that both | |
1572 | * the data_hdr and association have already been assigned. | |
1573 | */ | |
1574 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1575 | { | |
1576 | if (!chunk->has_tsn) { | |
1577 | /* This is the last possible instant to | |
1578 | * assign a TSN. | |
1579 | */ | |
1580 | chunk->subh.data_hdr->tsn = | |
1581 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1582 | chunk->has_tsn = 1; | |
1583 | } | |
1584 | } | |
1585 | ||
1586 | /* Create a CLOSED association to use with an incoming packet. */ | |
1587 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
327c0dab XL |
1588 | struct sctp_chunk *chunk, |
1589 | gfp_t gfp) | |
1da177e4 LT |
1590 | { |
1591 | struct sctp_association *asoc; | |
1c662018 | 1592 | enum sctp_scope scope; |
1da177e4 | 1593 | struct sk_buff *skb; |
1da177e4 LT |
1594 | |
1595 | /* Create the bare association. */ | |
1596 | scope = sctp_scope(sctp_source(chunk)); | |
1597 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1598 | if (!asoc) | |
1599 | goto nodata; | |
1600 | asoc->temp = 1; | |
1601 | skb = chunk->skb; | |
1602 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1603 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1604 | ||
1da177e4 LT |
1605 | nodata: |
1606 | return asoc; | |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | /* Build a cookie representing asoc. | |
1610 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1611 | */ | |
f48ef4c7 XL |
1612 | static struct sctp_cookie_param *sctp_pack_cookie( |
1613 | const struct sctp_endpoint *ep, | |
1614 | const struct sctp_association *asoc, | |
1615 | const struct sctp_chunk *init_chunk, | |
327c0dab XL |
1616 | int *cookie_len, const __u8 *raw_addrs, |
1617 | int addrs_len) | |
1da177e4 | 1618 | { |
1da177e4 | 1619 | struct sctp_signed_cookie *cookie; |
f48ef4c7 | 1620 | struct sctp_cookie_param *retval; |
1da177e4 | 1621 | int headersize, bodysize; |
1da177e4 | 1622 | |
9834a2bb VY |
1623 | /* Header size is static data prior to the actual cookie, including |
1624 | * any padding. | |
1625 | */ | |
3c918704 | 1626 | headersize = sizeof(struct sctp_paramhdr) + |
d808ad9a | 1627 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1628 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1629 | bodysize = sizeof(struct sctp_cookie) |
1630 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1631 | ||
1632 | /* Pad out the cookie to a multiple to make the signature | |
1633 | * functions simpler to write. | |
1634 | */ | |
1635 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1636 | bodysize += SCTP_COOKIE_MULTIPLE | |
1637 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1638 | *cookie_len = headersize + bodysize; | |
1639 | ||
1da177e4 LT |
1640 | /* Clear this memory since we are sending this data structure |
1641 | * out on the network. | |
1642 | */ | |
af997d8c ACM |
1643 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1644 | if (!retval) | |
1645 | goto nodata; | |
1646 | ||
1da177e4 LT |
1647 | cookie = (struct sctp_signed_cookie *) retval->body; |
1648 | ||
1649 | /* Set up the parameter header. */ | |
1650 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1651 | retval->p.length = htons(*cookie_len); | |
1652 | ||
1653 | /* Copy the cookie part of the association itself. */ | |
1654 | cookie->c = asoc->c; | |
1655 | /* Save the raw address list length in the cookie. */ | |
1656 | cookie->c.raw_addr_list_len = addrs_len; | |
1657 | ||
1658 | /* Remember PR-SCTP capability. */ | |
1659 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1660 | ||
0f3fffd8 ISJ |
1661 | /* Save adaptation indication in the cookie. */ |
1662 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1663 | |
1664 | /* Set an expiration time for the cookie. */ | |
52db882f | 1665 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1666 | ktime_get_real()); |
1da177e4 LT |
1667 | |
1668 | /* Copy the peer's init packet. */ | |
1669 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1670 | ntohs(init_chunk->chunk_hdr->length)); | |
1671 | ||
1672 | /* Copy the raw local address list of the association. */ | |
1673 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1674 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1675 | ||
d808ad9a | 1676 | if (sctp_sk(ep->base.sk)->hmac) { |
5821c769 HX |
1677 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); |
1678 | int err; | |
1b489e11 | 1679 | |
1da177e4 | 1680 | /* Sign the message. */ |
5821c769 HX |
1681 | desc->tfm = sctp_sk(ep->base.sk)->hmac; |
1682 | desc->flags = 0; | |
1683 | ||
1684 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1685 | sizeof(ep->secret_key)) ?: | |
1686 | crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, | |
1687 | cookie->signature); | |
1688 | shash_desc_zero(desc); | |
1689 | if (err) | |
1b489e11 | 1690 | goto free_cookie; |
1da177e4 LT |
1691 | } |
1692 | ||
1da177e4 | 1693 | return retval; |
1b489e11 HX |
1694 | |
1695 | free_cookie: | |
1696 | kfree(retval); | |
1697 | nodata: | |
1698 | *cookie_len = 0; | |
1699 | return NULL; | |
1da177e4 LT |
1700 | } |
1701 | ||
1702 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1703 | struct sctp_association *sctp_unpack_cookie( | |
327c0dab XL |
1704 | const struct sctp_endpoint *ep, |
1705 | const struct sctp_association *asoc, | |
1706 | struct sctp_chunk *chunk, gfp_t gfp, | |
1707 | int *error, struct sctp_chunk **errp) | |
1da177e4 LT |
1708 | { |
1709 | struct sctp_association *retval = NULL; | |
327c0dab | 1710 | int headersize, bodysize, fixed_size; |
1da177e4 | 1711 | struct sctp_signed_cookie *cookie; |
327c0dab | 1712 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 1713 | struct sctp_cookie *bear_cookie; |
313e7b4d | 1714 | __u8 *digest = ep->digest; |
1c662018 | 1715 | enum sctp_scope scope; |
327c0dab | 1716 | unsigned int len; |
52db882f | 1717 | ktime_t kt; |
1da177e4 | 1718 | |
9834a2bb VY |
1719 | /* Header size is static data prior to the actual cookie, including |
1720 | * any padding. | |
1721 | */ | |
922dbc5b | 1722 | headersize = sizeof(struct sctp_chunkhdr) + |
d808ad9a | 1723 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1724 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1725 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1726 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1727 | ||
1728 | /* Verify that the chunk looks like it even has a cookie. | |
1729 | * There must be enough room for our cookie and our peer's | |
1730 | * INIT chunk. | |
1731 | */ | |
1732 | len = ntohs(chunk->chunk_hdr->length); | |
1733 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1734 | goto malformed; | |
1735 | ||
1736 | /* Verify that the cookie has been padded out. */ | |
1737 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1738 | goto malformed; | |
1739 | ||
1740 | /* Process the cookie. */ | |
1741 | cookie = chunk->subh.cookie_hdr; | |
1742 | bear_cookie = &cookie->c; | |
1743 | ||
1744 | if (!sctp_sk(ep->base.sk)->hmac) | |
1745 | goto no_hmac; | |
1746 | ||
1747 | /* Check the signature. */ | |
5821c769 HX |
1748 | { |
1749 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); | |
1750 | int err; | |
1751 | ||
1752 | desc->tfm = sctp_sk(ep->base.sk)->hmac; | |
1753 | desc->flags = 0; | |
1754 | ||
1755 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1756 | sizeof(ep->secret_key)) ?: | |
1757 | crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, | |
1758 | digest); | |
1759 | shash_desc_zero(desc); | |
1760 | ||
1761 | if (err) { | |
1762 | *error = -SCTP_IERROR_NOMEM; | |
1763 | goto fail; | |
1764 | } | |
1b489e11 | 1765 | } |
1da177e4 LT |
1766 | |
1767 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
570617e7 DB |
1768 | *error = -SCTP_IERROR_BAD_SIG; |
1769 | goto fail; | |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | no_hmac: | |
1773 | /* IG Section 2.35.2: | |
1774 | * 3) Compare the port numbers and the verification tag contained | |
1775 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1776 | * verification tag within the SCTP common header of the received | |
1777 | * packet. If these values do not match the packet MUST be silently | |
1778 | * discarded, | |
1779 | */ | |
1780 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1781 | *error = -SCTP_IERROR_BAD_TAG; | |
1782 | goto fail; | |
1783 | } | |
1784 | ||
9b1dfad0 | 1785 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1786 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1787 | *error = -SCTP_IERROR_BAD_PORTS; | |
1788 | goto fail; | |
1789 | } | |
1790 | ||
1791 | /* Check to see if the cookie is stale. If there is already | |
1792 | * an association, there is no need to check cookie's expiration | |
1793 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1794 | * If skb has been timestamped, then use the stamp, otherwise |
1795 | * use current time. This introduces a small possibility that | |
1796 | * that a cookie may be considered expired, but his would only slow | |
1797 | * down the new association establishment instead of every packet. | |
1da177e4 | 1798 | */ |
f236218b | 1799 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
52db882f | 1800 | kt = skb_get_ktime(skb); |
f236218b | 1801 | else |
cb5e173e | 1802 | kt = ktime_get_real(); |
f236218b | 1803 | |
67cb9366 | 1804 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
8914f4ba MRL |
1805 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
1806 | __be32 n = htonl(usecs); | |
1807 | ||
1da177e4 LT |
1808 | /* |
1809 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1810 | * | |
1811 | * Cause of error | |
1812 | * --------------- | |
1813 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1814 | * Cookie that has expired. | |
1815 | */ | |
8914f4ba MRL |
1816 | *errp = sctp_make_op_error(asoc, chunk, |
1817 | SCTP_ERROR_STALE_COOKIE, &n, | |
1818 | sizeof(n), 0); | |
1819 | if (*errp) | |
1da177e4 | 1820 | *error = -SCTP_IERROR_STALE_COOKIE; |
8914f4ba | 1821 | else |
1da177e4 LT |
1822 | *error = -SCTP_IERROR_NOMEM; |
1823 | ||
1824 | goto fail; | |
1825 | } | |
1826 | ||
1827 | /* Make a new base association. */ | |
1828 | scope = sctp_scope(sctp_source(chunk)); | |
1829 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1830 | if (!retval) { | |
1831 | *error = -SCTP_IERROR_NOMEM; | |
1832 | goto fail; | |
1833 | } | |
1834 | ||
1835 | /* Set up our peer's port number. */ | |
1836 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1837 | ||
1838 | /* Populate the association from the cookie. */ | |
1839 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1840 | ||
1841 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1842 | GFP_ATOMIC) < 0) { | |
1843 | *error = -SCTP_IERROR_NOMEM; | |
1844 | goto fail; | |
1845 | } | |
1846 | ||
1847 | /* Also, add the destination address. */ | |
1848 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1849 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1850 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1851 | GFP_ATOMIC); | |
1da177e4 LT |
1852 | } |
1853 | ||
1854 | retval->next_tsn = retval->c.initial_tsn; | |
1855 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1856 | retval->addip_serial = retval->c.initial_tsn; | |
cc16f00f | 1857 | retval->strreset_outseq = retval->c.initial_tsn; |
1da177e4 LT |
1858 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1859 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1860 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1861 | |
1862 | /* The INIT stuff will be done by the side effects. */ | |
1863 | return retval; | |
1864 | ||
1865 | fail: | |
1866 | if (retval) | |
1867 | sctp_association_free(retval); | |
1868 | ||
1869 | return NULL; | |
1870 | ||
1871 | malformed: | |
1872 | /* Yikes! The packet is either corrupt or deliberately | |
1873 | * malformed. | |
1874 | */ | |
1875 | *error = -SCTP_IERROR_MALFORMED; | |
1876 | goto fail; | |
1877 | } | |
1878 | ||
1879 | /******************************************************************** | |
1880 | * 3rd Level Abstractions | |
1881 | ********************************************************************/ | |
1882 | ||
1883 | struct __sctp_missing { | |
9f81bcd9 AV |
1884 | __be32 num_missing; |
1885 | __be16 type; | |
bc10502d | 1886 | } __packed; |
1da177e4 LT |
1887 | |
1888 | /* | |
1889 | * Report a missing mandatory parameter. | |
1890 | */ | |
1891 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
34b4e29b | 1892 | enum sctp_param paramtype, |
1da177e4 LT |
1893 | struct sctp_chunk *chunk, |
1894 | struct sctp_chunk **errp) | |
1895 | { | |
1896 | struct __sctp_missing report; | |
1897 | __u16 len; | |
1898 | ||
e2f036a9 | 1899 | len = SCTP_PAD4(sizeof(report)); |
1da177e4 LT |
1900 | |
1901 | /* Make an ERROR chunk, preparing enough room for | |
1902 | * returning multiple unknown parameters. | |
1903 | */ | |
1904 | if (!*errp) | |
1905 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1906 | ||
1907 | if (*errp) { | |
1908 | report.num_missing = htonl(1); | |
1909 | report.type = paramtype; | |
ebdfcad4 | 1910 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1911 | sizeof(report)); |
1912 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | /* Stop processing this chunk. */ | |
1916 | return 0; | |
1917 | } | |
1918 | ||
1919 | /* Report an Invalid Mandatory Parameter. */ | |
1920 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1921 | struct sctp_chunk *chunk, | |
1922 | struct sctp_chunk **errp) | |
1923 | { | |
1924 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1925 | ||
1926 | if (!*errp) | |
1927 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1928 | ||
1929 | if (*errp) | |
00f1c2df | 1930 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1931 | |
1932 | /* Stop processing this chunk. */ | |
1933 | return 0; | |
1934 | } | |
1935 | ||
1936 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1937 | struct sctp_paramhdr *param, | |
1938 | const struct sctp_chunk *chunk, | |
1939 | struct sctp_chunk **errp) | |
1940 | { | |
7ab90804 VY |
1941 | /* This is a fatal error. Any accumulated non-fatal errors are |
1942 | * not reported. | |
1943 | */ | |
1944 | if (*errp) | |
1945 | sctp_chunk_free(*errp); | |
1946 | ||
1da177e4 | 1947 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1948 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1949 | |
1950 | return 0; | |
1951 | } | |
1952 | ||
1953 | ||
1954 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1955 | * send back an indicator to the peer. | |
1956 | */ | |
1957 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1958 | union sctp_params param, | |
1959 | struct sctp_chunk *chunk, | |
1960 | struct sctp_chunk **errp) | |
1961 | { | |
1962 | __u16 len = ntohs(param.p->length); | |
1963 | ||
7ab90804 VY |
1964 | /* Processing of the HOST_NAME parameter will generate an |
1965 | * ABORT. If we've accumulated any non-fatal errors, they | |
1966 | * would be unrecognized parameters and we should not include | |
1967 | * them in the ABORT. | |
1968 | */ | |
1969 | if (*errp) | |
1970 | sctp_chunk_free(*errp); | |
1971 | ||
8914f4ba MRL |
1972 | *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, |
1973 | param.v, len, 0); | |
1da177e4 LT |
1974 | |
1975 | /* Stop processing this chunk. */ | |
1976 | return 0; | |
1977 | } | |
1978 | ||
f53b5b09 | 1979 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
d6701191 | 1980 | { |
3c918704 | 1981 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
d6701191 | 1982 | int have_asconf = 0; |
327c0dab | 1983 | int have_auth = 0; |
d6701191 VY |
1984 | int i; |
1985 | ||
1986 | for (i = 0; i < num_ext; i++) { | |
1987 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1988 | case SCTP_CID_AUTH: |
1989 | have_auth = 1; | |
1990 | break; | |
1991 | case SCTP_CID_ASCONF: | |
1992 | case SCTP_CID_ASCONF_ACK: | |
1993 | have_asconf = 1; | |
1994 | break; | |
d6701191 VY |
1995 | } |
1996 | } | |
1997 | ||
1998 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1999 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
2000 | * only if ADD-IP is turned on and we are not backward-compatible | |
2001 | * mode. | |
2002 | */ | |
e1fc3b14 | 2003 | if (net->sctp.addip_noauth) |
d6701191 VY |
2004 | return 1; |
2005 | ||
e1fc3b14 | 2006 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
d6701191 VY |
2007 | return 0; |
2008 | ||
2009 | return 1; | |
2010 | } | |
2011 | ||
131a47e3 | 2012 | static void sctp_process_ext_param(struct sctp_association *asoc, |
327c0dab | 2013 | union sctp_params param) |
131a47e3 | 2014 | { |
3c918704 | 2015 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
327c0dab | 2016 | struct net *net = sock_net(asoc->base.sk); |
131a47e3 VY |
2017 | int i; |
2018 | ||
2019 | for (i = 0; i < num_ext; i++) { | |
2020 | switch (param.ext->chunks[i]) { | |
c28445c3 XL |
2021 | case SCTP_CID_RECONF: |
2022 | if (asoc->reconf_enable && | |
2023 | !asoc->peer.reconf_capable) | |
2024 | asoc->peer.reconf_capable = 1; | |
2025 | break; | |
f7010e61 | 2026 | case SCTP_CID_FWD_TSN: |
28aa4c26 XL |
2027 | if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) |
2028 | asoc->peer.prsctp_capable = 1; | |
f7010e61 | 2029 | break; |
2030 | case SCTP_CID_AUTH: | |
2031 | /* if the peer reports AUTH, assume that he | |
2032 | * supports AUTH. | |
2033 | */ | |
b14878cc | 2034 | if (asoc->ep->auth_enable) |
f7010e61 | 2035 | asoc->peer.auth_capable = 1; |
2036 | break; | |
2037 | case SCTP_CID_ASCONF: | |
2038 | case SCTP_CID_ASCONF_ACK: | |
2039 | if (net->sctp.addip_enable) | |
2040 | asoc->peer.asconf_capable = 1; | |
2041 | break; | |
96b120b3 XL |
2042 | case SCTP_CID_I_DATA: |
2043 | if (sctp_sk(asoc->base.sk)->strm_interleave) | |
2044 | asoc->intl_enable = 1; | |
2045 | break; | |
f7010e61 | 2046 | default: |
2047 | break; | |
131a47e3 VY |
2048 | } |
2049 | } | |
2050 | } | |
2051 | ||
1da177e4 LT |
2052 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2053 | * | |
2054 | * The Parameter Types are encoded such that the | |
2055 | * highest-order two bits specify the action that must be | |
2056 | * taken if the processing endpoint does not recognize the | |
2057 | * Parameter Type. | |
2058 | * | |
7ab90804 VY |
2059 | * 00 - Stop processing this parameter; do not process any further |
2060 | * parameters within this chunk | |
1da177e4 | 2061 | * |
7ab90804 VY |
2062 | * 01 - Stop processing this parameter, do not process any further |
2063 | * parameters within this chunk, and report the unrecognized | |
2064 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2065 | * |
2066 | * 10 - Skip this parameter and continue processing. | |
2067 | * | |
2068 | * 11 - Skip this parameter and continue processing but | |
2069 | * report the unrecognized parameter in an | |
7ab90804 | 2070 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2071 | * |
2072 | * Return value: | |
7ab90804 VY |
2073 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2074 | * SCTP_IERROR_ERROR - stop and report an error. | |
2075 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2076 | */ |
4785c7ae XL |
2077 | static enum sctp_ierror sctp_process_unk_param( |
2078 | const struct sctp_association *asoc, | |
2079 | union sctp_params param, | |
2080 | struct sctp_chunk *chunk, | |
2081 | struct sctp_chunk **errp) | |
1da177e4 | 2082 | { |
7ab90804 | 2083 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2084 | |
2085 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2086 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2087 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2088 | break; |
2089 | case SCTP_PARAM_ACTION_SKIP: | |
2090 | break; | |
7ab90804 VY |
2091 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2092 | retval = SCTP_IERROR_ERROR; | |
2093 | /* Fall through */ | |
1da177e4 LT |
2094 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2095 | /* Make an ERROR chunk, preparing enough room for | |
2096 | * returning multiple unknown parameters. | |
2097 | */ | |
8914f4ba MRL |
2098 | if (!*errp) { |
2099 | *errp = sctp_make_op_error_limited(asoc, chunk); | |
2100 | if (!*errp) { | |
2101 | /* If there is no memory for generating the | |
2102 | * ERROR report as specified, an ABORT will be | |
2103 | * triggered to the peer and the association | |
2104 | * won't be established. | |
2105 | */ | |
2106 | retval = SCTP_IERROR_NOMEM; | |
2107 | break; | |
2108 | } | |
1da177e4 | 2109 | } |
8914f4ba MRL |
2110 | |
2111 | if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
2112 | ntohs(param.p->length))) | |
2113 | sctp_addto_chunk(*errp, ntohs(param.p->length), | |
2114 | param.v); | |
1da177e4 LT |
2115 | break; |
2116 | default: | |
2117 | break; | |
2118 | } | |
2119 | ||
2120 | return retval; | |
2121 | } | |
2122 | ||
7ab90804 | 2123 | /* Verify variable length parameters |
1da177e4 | 2124 | * Return values: |
7ab90804 VY |
2125 | * SCTP_IERROR_ABORT - trigger an ABORT |
2126 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2127 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2128 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2129 | */ |
4785c7ae XL |
2130 | static enum sctp_ierror sctp_verify_param(struct net *net, |
2131 | const struct sctp_endpoint *ep, | |
2132 | const struct sctp_association *asoc, | |
2133 | union sctp_params param, | |
2134 | enum sctp_cid cid, | |
2135 | struct sctp_chunk *chunk, | |
2136 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2137 | { |
72da7b38 | 2138 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2139 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2140 | __u16 n_elt, id = 0; |
2141 | int i; | |
1da177e4 LT |
2142 | |
2143 | /* FIXME - This routine is not looking at each parameter per the | |
2144 | * chunk type, i.e., unrecognized parameters should be further | |
2145 | * identified based on the chunk id. | |
2146 | */ | |
2147 | ||
2148 | switch (param.p->type) { | |
2149 | case SCTP_PARAM_IPV4_ADDRESS: | |
2150 | case SCTP_PARAM_IPV6_ADDRESS: | |
2151 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2152 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2153 | case SCTP_PARAM_STATE_COOKIE: | |
2154 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2155 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2156 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2157 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2158 | break; |
2159 | ||
131a47e3 | 2160 | case SCTP_PARAM_SUPPORTED_EXT: |
f53b5b09 | 2161 | if (!sctp_verify_ext_param(net, param)) |
d6701191 | 2162 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2163 | break; |
2164 | ||
d6de3097 | 2165 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2166 | if (net->sctp.addip_enable) |
d6de3097 VY |
2167 | break; |
2168 | goto fallthrough; | |
2169 | ||
1da177e4 LT |
2170 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2171 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2172 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2173 | retval = SCTP_IERROR_ABORT; | |
2174 | break; | |
131a47e3 | 2175 | |
1da177e4 | 2176 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2177 | if (ep->prsctp_enable) |
1da177e4 | 2178 | break; |
730fc3d0 VY |
2179 | goto fallthrough; |
2180 | ||
2181 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2182 | if (!ep->auth_enable) |
730fc3d0 VY |
2183 | goto fallthrough; |
2184 | ||
2185 | /* SCTP-AUTH: Secion 6.1 | |
2186 | * If the random number is not 32 byte long the association | |
2187 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2188 | * cause 'Protocol Violation'. | |
2189 | */ | |
8914f4ba MRL |
2190 | if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - |
2191 | sizeof(struct sctp_paramhdr)) { | |
7ab90804 | 2192 | sctp_process_inv_paramlength(asoc, param.p, |
8914f4ba | 2193 | chunk, err_chunk); |
7ab90804 VY |
2194 | retval = SCTP_IERROR_ABORT; |
2195 | } | |
730fc3d0 VY |
2196 | break; |
2197 | ||
2198 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2199 | if (!ep->auth_enable) |
730fc3d0 VY |
2200 | goto fallthrough; |
2201 | ||
2202 | /* SCTP-AUTH: Section 3.2 | |
2203 | * The CHUNKS parameter MUST be included once in the INIT or | |
2204 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2205 | * chunks. Its maximum length is 260 bytes. | |
2206 | */ | |
7ab90804 VY |
2207 | if (260 < ntohs(param.p->length)) { |
2208 | sctp_process_inv_paramlength(asoc, param.p, | |
2209 | chunk, err_chunk); | |
2210 | retval = SCTP_IERROR_ABORT; | |
2211 | } | |
730fc3d0 VY |
2212 | break; |
2213 | ||
2214 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2215 | if (!ep->auth_enable) |
72da7b38 WY |
2216 | goto fallthrough; |
2217 | ||
2218 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
3c918704 XL |
2219 | n_elt = (ntohs(param.p->length) - |
2220 | sizeof(struct sctp_paramhdr)) >> 1; | |
72da7b38 WY |
2221 | |
2222 | /* SCTP-AUTH: Section 6.1 | |
2223 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2224 | * included in the HMAC-ALGO parameter. | |
2225 | */ | |
2226 | for (i = 0; i < n_elt; i++) { | |
2227 | id = ntohs(hmacs->hmac_ids[i]); | |
2228 | ||
2229 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2230 | break; | |
2231 | } | |
2232 | ||
2233 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2234 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2235 | err_chunk); | |
2236 | retval = SCTP_IERROR_ABORT; | |
2237 | } | |
2238 | break; | |
730fc3d0 | 2239 | fallthrough: |
1da177e4 | 2240 | default: |
bb33381d DB |
2241 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2242 | __func__, ntohs(param.p->type), cid); | |
2243 | ||
7ab90804 | 2244 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2245 | break; |
2246 | } | |
2247 | return retval; | |
2248 | } | |
2249 | ||
2250 | /* Verify the INIT packet before we process it. */ | |
b14878cc | 2251 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
6d85e68f | 2252 | const struct sctp_association *asoc, enum sctp_cid cid, |
01a992be XL |
2253 | struct sctp_init_chunk *peer_init, |
2254 | struct sctp_chunk *chunk, struct sctp_chunk **errp) | |
1da177e4 LT |
2255 | { |
2256 | union sctp_params param; | |
7613f5fe | 2257 | bool has_cookie = false; |
7ab90804 | 2258 | int result; |
1da177e4 | 2259 | |
7613f5fe DB |
2260 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2261 | * also mandatory, but is not checked here since the valid range | |
2262 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2263 | */ | |
2264 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2265 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2266 | peer_init->init_hdr.init_tag == 0 || | |
2267 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2268 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2269 | |
1da177e4 | 2270 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2271 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2272 | has_cookie = true; | |
2273 | } | |
1da177e4 LT |
2274 | |
2275 | /* There is a possibility that a parameter length was bad and | |
2276 | * in that case we would have stoped walking the parameters. | |
2277 | * The current param.p would point at the bad one. | |
2278 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2279 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2280 | * error handling code build and send the packet. | |
2281 | */ | |
26ac8e5f | 2282 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2283 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2284 | |
2285 | /* The only missing mandatory param possible today is | |
2286 | * the state cookie for an INIT-ACK chunk. | |
2287 | */ | |
7ab90804 VY |
2288 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2289 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2290 | chunk, errp); | |
1da177e4 | 2291 | |
7ab90804 | 2292 | /* Verify all the variable length parameters */ |
1da177e4 | 2293 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2294 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2295 | chunk, errp); | |
7ab90804 | 2296 | switch (result) { |
f7010e61 | 2297 | case SCTP_IERROR_ABORT: |
2298 | case SCTP_IERROR_NOMEM: | |
2299 | return 0; | |
2300 | case SCTP_IERROR_ERROR: | |
2301 | return 1; | |
2302 | case SCTP_IERROR_NO_ERROR: | |
2303 | default: | |
2304 | break; | |
1da177e4 LT |
2305 | } |
2306 | ||
2307 | } /* for (loop through all parameters) */ | |
2308 | ||
2309 | return 1; | |
2310 | } | |
2311 | ||
2312 | /* Unpack the parameters in an INIT packet into an association. | |
2313 | * Returns 0 on failure, else success. | |
2314 | * FIXME: This is an association method. | |
2315 | */ | |
de6becdc | 2316 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2317 | const union sctp_addr *peer_addr, |
01a992be | 2318 | struct sctp_init_chunk *peer_init, gfp_t gfp) |
1da177e4 | 2319 | { |
e1fc3b14 | 2320 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2321 | struct sctp_transport *transport; |
2322 | struct list_head *pos, *temp; | |
327c0dab | 2323 | union sctp_params param; |
de6becdc | 2324 | union sctp_addr addr; |
327c0dab | 2325 | struct sctp_af *af; |
de6becdc | 2326 | int src_match = 0; |
327c0dab | 2327 | char *cookie; |
1da177e4 LT |
2328 | |
2329 | /* We must include the address that the INIT packet came from. | |
2330 | * This is the only address that matters for an INIT packet. | |
2331 | * When processing a COOKIE ECHO, we retrieve the from address | |
2332 | * of the INIT from the cookie. | |
2333 | */ | |
2334 | ||
2335 | /* This implementation defaults to making the first transport | |
2336 | * added as the primary transport. The source address seems to | |
2337 | * be a a better choice than any of the embedded addresses. | |
2338 | */ | |
cb3f837b | 2339 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2340 | goto nomem; |
2341 | ||
2342 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2343 | src_match = 1; | |
1da177e4 LT |
2344 | |
2345 | /* Process the initialization parameters. */ | |
1da177e4 | 2346 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2347 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2348 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2349 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2350 | af->from_addr_param(&addr, param.addr, | |
2351 | chunk->sctp_hdr->source, 0); | |
2352 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2353 | src_match = 1; | |
2354 | } | |
1da177e4 LT |
2355 | |
2356 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2357 | goto clean_up; |
1da177e4 LT |
2358 | } |
2359 | ||
de6becdc WY |
2360 | /* source address of chunk may not match any valid address */ |
2361 | if (!src_match) | |
2362 | goto clean_up; | |
2363 | ||
730fc3d0 VY |
2364 | /* AUTH: After processing the parameters, make sure that we |
2365 | * have all the required info to potentially do authentications. | |
2366 | */ | |
2367 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2368 | !asoc->peer.peer_hmacs)) | |
2369 | asoc->peer.auth_capable = 0; | |
2370 | ||
d6701191 VY |
2371 | /* In a non-backward compatible mode, if the peer claims |
2372 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2373 | * that we MUST ABORT the association. Section 6. The section | |
2374 | * also give us an option to silently ignore the packet, which | |
2375 | * is what we'll do here. | |
6b2f9cb6 | 2376 | */ |
e1fc3b14 | 2377 | if (!net->sctp.addip_noauth && |
73d9c4fd | 2378 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
6b2f9cb6 VY |
2379 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2380 | SCTP_PARAM_DEL_IP | | |
2381 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2382 | asoc->peer.asconf_capable = 0; |
d6701191 | 2383 | goto clean_up; |
6b2f9cb6 VY |
2384 | } |
2385 | ||
3f7a87d2 FF |
2386 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2387 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2388 | transport = list_entry(pos, struct sctp_transport, transports); | |
2389 | if (transport->state == SCTP_UNKNOWN) { | |
2390 | sctp_assoc_rm_peer(asoc, transport); | |
2391 | } | |
2392 | } | |
2393 | ||
1da177e4 LT |
2394 | /* The fixed INIT headers are always in network byte |
2395 | * order. | |
2396 | */ | |
2397 | asoc->peer.i.init_tag = | |
2398 | ntohl(peer_init->init_hdr.init_tag); | |
2399 | asoc->peer.i.a_rwnd = | |
2400 | ntohl(peer_init->init_hdr.a_rwnd); | |
2401 | asoc->peer.i.num_outbound_streams = | |
2402 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2403 | asoc->peer.i.num_inbound_streams = | |
2404 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2405 | asoc->peer.i.initial_tsn = | |
2406 | ntohl(peer_init->init_hdr.initial_tsn); | |
2407 | ||
cc16f00f XL |
2408 | asoc->strreset_inseq = asoc->peer.i.initial_tsn; |
2409 | ||
1da177e4 LT |
2410 | /* Apply the upper bounds for output streams based on peer's |
2411 | * number of inbound streams. | |
2412 | */ | |
2413 | if (asoc->c.sinit_num_ostreams > | |
2414 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2415 | asoc->c.sinit_num_ostreams = | |
2416 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2417 | } | |
2418 | ||
2419 | if (asoc->c.sinit_max_instreams > | |
2420 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2421 | asoc->c.sinit_max_instreams = | |
2422 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2423 | } | |
2424 | ||
2425 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2426 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2427 | ||
2428 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2429 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2430 | ||
2431 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2432 | cookie = asoc->peer.cookie; | |
2433 | if (cookie) { | |
af997d8c | 2434 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2435 | if (!asoc->peer.cookie) |
2436 | goto clean_up; | |
1da177e4 LT |
2437 | } |
2438 | ||
2439 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2440 | * high (for example, implementations MAY use the size of the receiver | |
2441 | * advertised window). | |
2442 | */ | |
9dbc15f0 RD |
2443 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2444 | transports) { | |
1da177e4 LT |
2445 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2446 | } | |
2447 | ||
2448 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2449 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2450 | asoc->peer.i.initial_tsn, gfp)) | |
2451 | goto clean_up; | |
1da177e4 LT |
2452 | |
2453 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2454 | * | |
2455 | * The stream sequence number in all the streams shall start | |
2456 | * from 0 when the association is established. Also, when the | |
2457 | * stream sequence number reaches the value 65535 the next | |
2458 | * stream sequence number shall be set to 0. | |
2459 | */ | |
2460 | ||
ff356414 XL |
2461 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
2462 | asoc->c.sinit_max_instreams, gfp)) | |
7e062977 | 2463 | goto clean_up; |
1da177e4 | 2464 | |
4135cce7 XL |
2465 | /* Update frag_point when stream_interleave may get changed. */ |
2466 | sctp_assoc_update_frag_point(asoc); | |
2467 | ||
7e062977 XL |
2468 | if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) |
2469 | goto clean_up; | |
1da177e4 LT |
2470 | |
2471 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2472 | * | |
2473 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2474 | * remote endpoint it should do the following: | |
2475 | * ... | |
2476 | * A2) A serial number should be assigned to the Chunk. The serial | |
2477 | * number should be a monotonically increasing number. All serial | |
2478 | * numbers are defined to be initialized at the start of the | |
2479 | * association to the same value as the Initial TSN. | |
2480 | */ | |
2481 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2482 | return 1; | |
2483 | ||
2484 | clean_up: | |
2485 | /* Release the transport structures. */ | |
2486 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2487 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2488 | if (transport->state != SCTP_ACTIVE) |
2489 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2490 | } |
3f7a87d2 | 2491 | |
1da177e4 LT |
2492 | nomem: |
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | ||
2497 | /* Update asoc with the option described in param. | |
2498 | * | |
2499 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2500 | * | |
2501 | * asoc is the association to update. | |
2502 | * param is the variable length parameter to use for update. | |
2503 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2504 | * If the current packet is an INIT we want to minimize the amount of | |
2505 | * work we do. In particular, we should not build transport | |
2506 | * structures for the addresses. | |
2507 | */ | |
2508 | static int sctp_process_param(struct sctp_association *asoc, | |
2509 | union sctp_params param, | |
2510 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2511 | gfp_t gfp) |
1da177e4 | 2512 | { |
e7ff4a70 | 2513 | struct net *net = sock_net(asoc->base.sk); |
327c0dab | 2514 | struct sctp_endpoint *ep = asoc->ep; |
d6de3097 VY |
2515 | union sctp_addr_param *addr_param; |
2516 | struct sctp_transport *t; | |
327c0dab XL |
2517 | enum sctp_scope scope; |
2518 | union sctp_addr addr; | |
2519 | struct sctp_af *af; | |
2520 | int retval = 1, i; | |
2521 | u32 stale; | |
2522 | __u16 sat; | |
1da177e4 LT |
2523 | |
2524 | /* We maintain all INIT parameters in network byte order all the | |
2525 | * time. This allows us to not worry about whether the parameters | |
2526 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2527 | */ | |
2528 | switch (param.p->type) { | |
2529 | case SCTP_PARAM_IPV6_ADDRESS: | |
2530 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2531 | break; | |
7dab83de VY |
2532 | goto do_addr_param; |
2533 | ||
1da177e4 | 2534 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2535 | /* v4 addresses are not allowed on v6-only socket */ |
2536 | if (ipv6_only_sock(asoc->base.sk)) | |
2537 | break; | |
2538 | do_addr_param: | |
1da177e4 | 2539 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2540 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2541 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2542 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2543 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2544 | return 0; |
2545 | break; | |
2546 | ||
2547 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2548 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2549 | break; |
2550 | ||
2551 | stale = ntohl(param.life->lifespan_increment); | |
2552 | ||
2553 | /* Suggested Cookie Life span increment's unit is msec, | |
2554 | * (1/1000sec). | |
2555 | */ | |
52db882f | 2556 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2557 | break; |
2558 | ||
2559 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2560 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2561 | break; |
2562 | ||
2563 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2564 | /* Turn off the default values first so we'll know which | |
2565 | * ones are really set by the peer. | |
2566 | */ | |
2567 | asoc->peer.ipv4_address = 0; | |
2568 | asoc->peer.ipv6_address = 0; | |
2569 | ||
140ee960 GJ |
2570 | /* Assume that peer supports the address family |
2571 | * by which it sends a packet. | |
2572 | */ | |
2573 | if (peer_addr->sa.sa_family == AF_INET6) | |
2574 | asoc->peer.ipv6_address = 1; | |
2575 | else if (peer_addr->sa.sa_family == AF_INET) | |
2576 | asoc->peer.ipv4_address = 1; | |
2577 | ||
1da177e4 | 2578 | /* Cycle through address types; avoid divide by 0. */ |
3c918704 | 2579 | sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2580 | if (sat) |
2581 | sat /= sizeof(__u16); | |
2582 | ||
2583 | for (i = 0; i < sat; ++i) { | |
2584 | switch (param.sat->types[i]) { | |
2585 | case SCTP_PARAM_IPV4_ADDRESS: | |
2586 | asoc->peer.ipv4_address = 1; | |
2587 | break; | |
2588 | ||
2589 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2590 | if (PF_INET6 == asoc->base.sk->sk_family) |
2591 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2592 | break; |
2593 | ||
2594 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2595 | asoc->peer.hostname_address = 1; | |
2596 | break; | |
2597 | ||
2598 | default: /* Just ignore anything else. */ | |
2599 | break; | |
3ff50b79 | 2600 | } |
1da177e4 LT |
2601 | } |
2602 | break; | |
2603 | ||
2604 | case SCTP_PARAM_STATE_COOKIE: | |
2605 | asoc->peer.cookie_len = | |
3c918704 | 2606 | ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2607 | asoc->peer.cookie = param.cookie->body; |
2608 | break; | |
2609 | ||
2610 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2611 | /* Would be odd to receive, but it causes no problems. */ | |
2612 | break; | |
2613 | ||
2614 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2615 | /* Rejected during verify stage. */ | |
2616 | break; | |
2617 | ||
2618 | case SCTP_PARAM_ECN_CAPABLE: | |
2619 | asoc->peer.ecn_capable = 1; | |
2620 | break; | |
2621 | ||
0f3fffd8 | 2622 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2623 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2624 | break; |
2625 | ||
d6de3097 | 2626 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2627 | if (!net->sctp.addip_enable) |
0ef46e28 VY |
2628 | goto fall_through; |
2629 | ||
8b32f234 | 2630 | addr_param = param.v + sizeof(struct sctp_addip_param); |
d6de3097 | 2631 | |
cfbf654e | 2632 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2633 | if (af == NULL) |
2634 | break; | |
2635 | ||
d6de3097 VY |
2636 | af->from_addr_param(&addr, addr_param, |
2637 | htons(asoc->peer.port), 0); | |
2638 | ||
2639 | /* if the address is invalid, we can't process it. | |
2640 | * XXX: see spec for what to do. | |
2641 | */ | |
2642 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2643 | break; | |
2644 | ||
2645 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2646 | if (!t) | |
2647 | break; | |
2648 | ||
2649 | sctp_assoc_set_primary(asoc, t); | |
2650 | break; | |
2651 | ||
131a47e3 VY |
2652 | case SCTP_PARAM_SUPPORTED_EXT: |
2653 | sctp_process_ext_param(asoc, param); | |
2654 | break; | |
2655 | ||
1da177e4 | 2656 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2657 | if (asoc->prsctp_enable) { |
1da177e4 LT |
2658 | asoc->peer.prsctp_capable = 1; |
2659 | break; | |
2660 | } | |
d808ad9a | 2661 | /* Fall Through */ |
730fc3d0 VY |
2662 | goto fall_through; |
2663 | ||
2664 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2665 | if (!ep->auth_enable) |
730fc3d0 VY |
2666 | goto fall_through; |
2667 | ||
2668 | /* Save peer's random parameter */ | |
2669 | asoc->peer.peer_random = kmemdup(param.p, | |
2670 | ntohs(param.p->length), gfp); | |
2671 | if (!asoc->peer.peer_random) { | |
2672 | retval = 0; | |
2673 | break; | |
2674 | } | |
2675 | break; | |
2676 | ||
2677 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2678 | if (!ep->auth_enable) |
730fc3d0 VY |
2679 | goto fall_through; |
2680 | ||
2681 | /* Save peer's HMAC list */ | |
2682 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2683 | ntohs(param.p->length), gfp); | |
2684 | if (!asoc->peer.peer_hmacs) { | |
2685 | retval = 0; | |
2686 | break; | |
2687 | } | |
2688 | ||
2689 | /* Set the default HMAC the peer requested*/ | |
2690 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2691 | break; | |
2692 | ||
2693 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2694 | if (!ep->auth_enable) |
730fc3d0 VY |
2695 | goto fall_through; |
2696 | ||
2697 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2698 | ntohs(param.p->length), gfp); | |
2699 | if (!asoc->peer.peer_chunks) | |
2700 | retval = 0; | |
2701 | break; | |
2702 | fall_through: | |
1da177e4 LT |
2703 | default: |
2704 | /* Any unrecognized parameters should have been caught | |
2705 | * and handled by sctp_verify_param() which should be | |
2706 | * called prior to this routine. Simply log the error | |
2707 | * here. | |
2708 | */ | |
bb33381d DB |
2709 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2710 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2711 | break; |
3ff50b79 | 2712 | } |
1da177e4 LT |
2713 | |
2714 | return retval; | |
2715 | } | |
2716 | ||
2717 | /* Select a new verification tag. */ | |
2718 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2719 | { | |
2720 | /* I believe that this random number generator complies with RFC1750. | |
2721 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2722 | */ | |
2723 | __u32 x; | |
2724 | ||
2725 | do { | |
2726 | get_random_bytes(&x, sizeof(__u32)); | |
2727 | } while (x == 0); | |
2728 | ||
2729 | return x; | |
2730 | } | |
2731 | ||
2732 | /* Select an initial TSN to send during startup. */ | |
2733 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2734 | { | |
2735 | __u32 retval; | |
2736 | ||
2737 | get_random_bytes(&retval, sizeof(__u32)); | |
2738 | return retval; | |
2739 | } | |
2740 | ||
2741 | /* | |
2742 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2743 | * 0 1 2 3 | |
2744 | * 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 | |
2745 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2746 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2747 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2748 | * | Serial Number | | |
2749 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2750 | * | Address Parameter | | |
2751 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2752 | * | ASCONF Parameter #1 | | |
2753 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2754 | * \ \ | |
2755 | * / .... / | |
2756 | * \ \ | |
2757 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2758 | * | ASCONF Parameter #N | | |
2759 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2760 | * | |
d808ad9a | 2761 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2762 | */ |
2763 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2764 | union sctp_addr *addr, | |
2765 | int vparam_len) | |
2766 | { | |
65205cc4 | 2767 | struct sctp_addiphdr asconf; |
1da177e4 LT |
2768 | struct sctp_chunk *retval; |
2769 | int length = sizeof(asconf) + vparam_len; | |
2770 | union sctp_addr_param addrparam; | |
2771 | int addrlen; | |
2772 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2773 | ||
2774 | addrlen = af->to_addr_param(addr, &addrparam); | |
2775 | if (!addrlen) | |
2776 | return NULL; | |
2777 | length += addrlen; | |
2778 | ||
2779 | /* Create the chunk. */ | |
cea8768f MRL |
2780 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2781 | GFP_ATOMIC); | |
1da177e4 LT |
2782 | if (!retval) |
2783 | return NULL; | |
2784 | ||
2785 | asconf.serial = htonl(asoc->addip_serial++); | |
2786 | ||
2787 | retval->subh.addip_hdr = | |
2788 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2789 | retval->param_hdr.v = | |
2790 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2791 | ||
2792 | return retval; | |
2793 | } | |
2794 | ||
2795 | /* ADDIP | |
2796 | * 3.2.1 Add IP Address | |
2797 | * 0 1 2 3 | |
2798 | * 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 | |
2799 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2800 | * | Type = 0xC001 | Length = Variable | | |
2801 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2802 | * | ASCONF-Request Correlation ID | | |
2803 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2804 | * | Address Parameter | | |
2805 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2806 | * | |
2807 | * 3.2.2 Delete IP Address | |
2808 | * 0 1 2 3 | |
2809 | * 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 | |
2810 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2811 | * | Type = 0xC002 | Length = Variable | | |
2812 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2813 | * | ASCONF-Request Correlation ID | | |
2814 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2815 | * | Address Parameter | | |
2816 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2817 | * | |
2818 | */ | |
2819 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
327c0dab XL |
2820 | union sctp_addr *laddr, |
2821 | struct sockaddr *addrs, | |
2822 | int addrcnt, __be16 flags) | |
1da177e4 | 2823 | { |
327c0dab | 2824 | union sctp_addr_param addr_param; |
8b32f234 | 2825 | struct sctp_addip_param param; |
327c0dab XL |
2826 | int paramlen = sizeof(param); |
2827 | struct sctp_chunk *retval; | |
2828 | int addr_param_len = 0; | |
2829 | union sctp_addr *addr; | |
2830 | int totallen = 0, i; | |
2831 | int del_pickup = 0; | |
2832 | struct sctp_af *af; | |
2833 | void *addr_buf; | |
1da177e4 LT |
2834 | |
2835 | /* Get total length of all the address parameters. */ | |
2836 | addr_buf = addrs; | |
2837 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2838 | addr = addr_buf; |
1da177e4 LT |
2839 | af = sctp_get_af_specific(addr->v4.sin_family); |
2840 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2841 | ||
2842 | totallen += paramlen; | |
2843 | totallen += addr_param_len; | |
2844 | ||
2845 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2846 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2847 | /* reuse the parameter length from the same scope one */ | |
2848 | totallen += paramlen; | |
2849 | totallen += addr_param_len; | |
2850 | del_pickup = 1; | |
bb33381d DB |
2851 | |
2852 | pr_debug("%s: picked same-scope del_pending addr, " | |
2853 | "totallen for all addresses is %d\n", | |
2854 | __func__, totallen); | |
8a07eb0a | 2855 | } |
1da177e4 LT |
2856 | } |
2857 | ||
2858 | /* Create an asconf chunk with the required length. */ | |
2859 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2860 | if (!retval) | |
2861 | return NULL; | |
2862 | ||
2863 | /* Add the address parameters to the asconf chunk. */ | |
2864 | addr_buf = addrs; | |
2865 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2866 | addr = addr_buf; |
1da177e4 LT |
2867 | af = sctp_get_af_specific(addr->v4.sin_family); |
2868 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2869 | param.param_hdr.type = flags; | |
2870 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2871 | param.crr_id = htonl(i); |
1da177e4 LT |
2872 | |
2873 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2874 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2875 | ||
2876 | addr_buf += af->sockaddr_len; | |
2877 | } | |
8a07eb0a MH |
2878 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2879 | addr = asoc->asconf_addr_del_pending; | |
2880 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2881 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2882 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2883 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2884 | param.crr_id = htonl(i); |
8a07eb0a MH |
2885 | |
2886 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2887 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2888 | } | |
1da177e4 LT |
2889 | return retval; |
2890 | } | |
2891 | ||
2892 | /* ADDIP | |
2893 | * 3.2.4 Set Primary IP Address | |
2894 | * 0 1 2 3 | |
2895 | * 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 | |
2896 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2897 | * | Type =0xC004 | Length = Variable | | |
2898 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2899 | * | ASCONF-Request Correlation ID | | |
2900 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2901 | * | Address Parameter | | |
2902 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2903 | * | |
d808ad9a | 2904 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2905 | */ |
2906 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2907 | union sctp_addr *addr) | |
2908 | { | |
327c0dab XL |
2909 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2910 | union sctp_addr_param addrparam; | |
8b32f234 | 2911 | struct sctp_addip_param param; |
327c0dab XL |
2912 | struct sctp_chunk *retval; |
2913 | int len = sizeof(param); | |
2914 | int addrlen; | |
1da177e4 LT |
2915 | |
2916 | addrlen = af->to_addr_param(addr, &addrparam); | |
2917 | if (!addrlen) | |
2918 | return NULL; | |
2919 | len += addrlen; | |
2920 | ||
2921 | /* Create the chunk and make asconf header. */ | |
2922 | retval = sctp_make_asconf(asoc, addr, len); | |
2923 | if (!retval) | |
2924 | return NULL; | |
2925 | ||
2926 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2927 | param.param_hdr.length = htons(len); | |
2928 | param.crr_id = 0; | |
2929 | ||
2930 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2931 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2932 | ||
2933 | return retval; | |
2934 | } | |
2935 | ||
2936 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2937 | * 0 1 2 3 | |
2938 | * 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 | |
2939 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2940 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2941 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2942 | * | Serial Number | | |
2943 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2944 | * | ASCONF Parameter Response#1 | | |
2945 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2946 | * \ \ | |
2947 | * / .... / | |
2948 | * \ \ | |
2949 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2950 | * | ASCONF Parameter Response#N | | |
2951 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2952 | * | |
d808ad9a | 2953 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2954 | */ |
2955 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2956 | __u32 serial, int vparam_len) | |
2957 | { | |
327c0dab XL |
2958 | struct sctp_addiphdr asconf; |
2959 | struct sctp_chunk *retval; | |
2960 | int length = sizeof(asconf) + vparam_len; | |
1da177e4 LT |
2961 | |
2962 | /* Create the chunk. */ | |
cea8768f MRL |
2963 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2964 | GFP_ATOMIC); | |
1da177e4 LT |
2965 | if (!retval) |
2966 | return NULL; | |
2967 | ||
2968 | asconf.serial = htonl(serial); | |
2969 | ||
2970 | retval->subh.addip_hdr = | |
2971 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2972 | ||
2973 | return retval; | |
2974 | } | |
2975 | ||
2976 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2977 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
8b32f234 XL |
2978 | __be16 err_code, |
2979 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 2980 | { |
8b32f234 | 2981 | struct sctp_addip_param ack_param; |
327c0dab XL |
2982 | struct sctp_errhdr err_param; |
2983 | int asconf_param_len = 0; | |
2984 | int err_param_len = 0; | |
2985 | __be16 response_type; | |
1da177e4 LT |
2986 | |
2987 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2988 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2989 | } else { | |
2990 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2991 | err_param_len = sizeof(err_param); | |
2992 | if (asconf_param) | |
2993 | asconf_param_len = | |
2994 | ntohs(asconf_param->param_hdr.length); | |
2995 | } | |
2996 | ||
d808ad9a | 2997 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2998 | ack_param.param_hdr.type = response_type; |
2999 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
3000 | err_param_len + | |
3001 | asconf_param_len); | |
3002 | ack_param.crr_id = crr_id; | |
3003 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
3004 | ||
3005 | if (SCTP_ERROR_NO_ERROR == err_code) | |
3006 | return; | |
3007 | ||
3008 | /* Add Error Cause parameter. */ | |
3009 | err_param.cause = err_code; | |
3010 | err_param.length = htons(err_param_len + asconf_param_len); | |
3011 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
3012 | ||
3013 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3014 | if (asconf_param) | |
3015 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3016 | } | |
3017 | ||
3018 | /* Process a asconf parameter. */ | |
dbc16db1 | 3019 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
8b32f234 XL |
3020 | struct sctp_chunk *asconf, |
3021 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 3022 | { |
327c0dab | 3023 | union sctp_addr_param *addr_param; |
1da177e4 | 3024 | struct sctp_transport *peer; |
1da177e4 | 3025 | union sctp_addr addr; |
327c0dab | 3026 | struct sctp_af *af; |
5f242a13 | 3027 | |
8b32f234 | 3028 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
c1cc678a | 3029 | |
44e65c1e WY |
3030 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3031 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3032 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3033 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3034 | ||
6a435732 | 3035 | switch (addr_param->p.type) { |
c4492586 WY |
3036 | case SCTP_PARAM_IPV6_ADDRESS: |
3037 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3038 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3039 | break; |
3040 | case SCTP_PARAM_IPV4_ADDRESS: | |
3041 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3042 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3043 | break; |
3044 | default: | |
945e5abc | 3045 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3046 | } |
3047 | ||
6a435732 | 3048 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3049 | if (unlikely(!af)) |
945e5abc | 3050 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3051 | |
dd86d136 | 3052 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3053 | |
3054 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3055 | * or multicast address. | |
3056 | * (note: wildcard is permitted and requires special handling so | |
3057 | * make sure we check for that) | |
3058 | */ | |
3059 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3060 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3061 | |
1da177e4 LT |
3062 | switch (asconf_param->param_hdr.type) { |
3063 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3064 | /* Section 4.2.1: |
3065 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3066 | * address of the packet MUST be added. | |
3067 | */ | |
3068 | if (af->is_any(&addr)) | |
3069 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3070 | ||
2277c7cd RH |
3071 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3072 | SCTP_PARAM_ADD_IP, | |
3073 | (struct sockaddr *)&addr, | |
3074 | af->sockaddr_len)) | |
3075 | return SCTP_ERROR_REQ_REFUSED; | |
3076 | ||
1da177e4 | 3077 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3078 | * request and does not have the local resources to add this |
3079 | * new address to the association, it MUST return an Error | |
3080 | * Cause TLV set to the new error code 'Operation Refused | |
3081 | * Due to Resource Shortage'. | |
3082 | */ | |
1da177e4 | 3083 | |
dd86d136 | 3084 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3085 | if (!peer) |
3086 | return SCTP_ERROR_RSRC_LOW; | |
3087 | ||
3088 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3089 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3090 | asoc->new_transport = peer; |
1da177e4 LT |
3091 | break; |
3092 | case SCTP_PARAM_DEL_IP: | |
3093 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3094 | * last remaining IP address of a peer endpoint, the receiver |
3095 | * MUST send an Error Cause TLV with the error cause set to the | |
3096 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3097 | */ | |
42e30bf3 | 3098 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3099 | return SCTP_ERROR_DEL_LAST_IP; |
3100 | ||
3101 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3102 | * address which is also the source address of the IP packet | |
3103 | * which contained the ASCONF chunk, the receiver MUST reject | |
3104 | * this request. To reject the request the receiver MUST send | |
3105 | * an Error Cause TLV set to the new error code 'Request to | |
3106 | * Delete Source IP Address' | |
3107 | */ | |
b1364104 | 3108 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3109 | return SCTP_ERROR_DEL_SRC_IP; |
3110 | ||
42e30bf3 VY |
3111 | /* Section 4.2.2 |
3112 | * If the address 0.0.0.0 or ::0 is provided, all | |
3113 | * addresses of the peer except the source address of the | |
3114 | * packet MUST be deleted. | |
3115 | */ | |
3116 | if (af->is_any(&addr)) { | |
3117 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3118 | sctp_assoc_del_nonprimary_peers(asoc, | |
3119 | asconf->transport); | |
7c5a9461 | 3120 | return SCTP_ERROR_NO_ERROR; |
3121 | } | |
3122 | ||
3123 | /* If the address is not part of the association, the | |
3124 | * ASCONF-ACK with Error Cause Indication Parameter | |
3125 | * which including cause of Unresolvable Address should | |
3126 | * be sent. | |
3127 | */ | |
3128 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3129 | if (!peer) | |
3130 | return SCTP_ERROR_DNS_FAILED; | |
3131 | ||
3132 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3133 | break; |
3134 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3135 | /* ADDIP Section 4.2.4 |
3136 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3137 | * MAY mark the source address of the packet as its | |
3138 | * primary. | |
3139 | */ | |
3140 | if (af->is_any(&addr)) | |
3141 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3142 | ||
2277c7cd RH |
3143 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3144 | SCTP_PARAM_SET_PRIMARY, | |
3145 | (struct sockaddr *)&addr, | |
3146 | af->sockaddr_len)) | |
3147 | return SCTP_ERROR_REQ_REFUSED; | |
3148 | ||
dd86d136 | 3149 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3150 | if (!peer) |
945e5abc | 3151 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3152 | |
3153 | sctp_assoc_set_primary(asoc, peer); | |
3154 | break; | |
1da177e4 LT |
3155 | } |
3156 | ||
3157 | return SCTP_ERROR_NO_ERROR; | |
3158 | } | |
3159 | ||
9de7922b DB |
3160 | /* Verify the ASCONF packet before we process it. */ |
3161 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3162 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3163 | struct sctp_paramhdr **errp) | |
3164 | { | |
68d75469 | 3165 | struct sctp_addip_chunk *addip; |
9de7922b | 3166 | bool addr_param_seen = false; |
327c0dab | 3167 | union sctp_params param; |
6f4c618d | 3168 | |
68d75469 | 3169 | addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; |
9de7922b DB |
3170 | sctp_walk_params(param, addip, addip_hdr.params) { |
3171 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3172 | |
9de7922b | 3173 | *errp = param.p; |
6f4c618d | 3174 | switch (param.p->type) { |
9de7922b DB |
3175 | case SCTP_PARAM_ERR_CAUSE: |
3176 | break; | |
3177 | case SCTP_PARAM_IPV4_ADDRESS: | |
a38905e6 | 3178 | if (length != sizeof(struct sctp_ipv4addr_param)) |
9de7922b | 3179 | return false; |
ce7b4ccc | 3180 | /* ensure there is only one addr param and it's in the |
3181 | * beginning of addip_hdr params, or we reject it. | |
3182 | */ | |
3183 | if (param.v != addip->addip_hdr.params) | |
3184 | return false; | |
9de7922b DB |
3185 | addr_param_seen = true; |
3186 | break; | |
3187 | case SCTP_PARAM_IPV6_ADDRESS: | |
00987cc0 | 3188 | if (length != sizeof(struct sctp_ipv6addr_param)) |
9de7922b | 3189 | return false; |
ce7b4ccc | 3190 | if (param.v != addip->addip_hdr.params) |
3191 | return false; | |
9de7922b DB |
3192 | addr_param_seen = true; |
3193 | break; | |
6f4c618d WY |
3194 | case SCTP_PARAM_ADD_IP: |
3195 | case SCTP_PARAM_DEL_IP: | |
3196 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3197 | /* In ASCONF chunks, these need to be first. */ |
3198 | if (addr_param_needed && !addr_param_seen) | |
3199 | return false; | |
3200 | length = ntohs(param.addip->param_hdr.length); | |
8b32f234 | 3201 | if (length < sizeof(struct sctp_addip_param) + |
3c918704 | 3202 | sizeof(**errp)) |
9de7922b | 3203 | return false; |
6f4c618d WY |
3204 | break; |
3205 | case SCTP_PARAM_SUCCESS_REPORT: | |
3206 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
8b32f234 | 3207 | if (length != sizeof(struct sctp_addip_param)) |
9de7922b | 3208 | return false; |
6f4c618d WY |
3209 | break; |
3210 | default: | |
9de7922b DB |
3211 | /* This is unkown to us, reject! */ |
3212 | return false; | |
6f4c618d | 3213 | } |
6f4c618d WY |
3214 | } |
3215 | ||
9de7922b DB |
3216 | /* Remaining sanity checks. */ |
3217 | if (addr_param_needed && !addr_param_seen) | |
3218 | return false; | |
3219 | if (!addr_param_needed && addr_param_seen) | |
3220 | return false; | |
3221 | if (param.v != chunk->chunk_end) | |
3222 | return false; | |
6f4c618d | 3223 | |
9de7922b | 3224 | return true; |
6f4c618d WY |
3225 | } |
3226 | ||
d808ad9a | 3227 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3228 | * return an ASCONF_ACK chunk to be sent in response. |
3229 | */ | |
3230 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3231 | struct sctp_chunk *asconf) | |
3232 | { | |
327c0dab | 3233 | union sctp_addr_param *addr_param; |
68d75469 | 3234 | struct sctp_addip_chunk *addip; |
327c0dab | 3235 | struct sctp_chunk *asconf_ack; |
9de7922b | 3236 | bool all_param_pass = true; |
327c0dab XL |
3237 | struct sctp_addiphdr *hdr; |
3238 | int length = 0, chunk_len; | |
9de7922b | 3239 | union sctp_params param; |
327c0dab XL |
3240 | __be16 err_code; |
3241 | __u32 serial; | |
1da177e4 | 3242 | |
68d75469 | 3243 | addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; |
922dbc5b XL |
3244 | chunk_len = ntohs(asconf->chunk_hdr->length) - |
3245 | sizeof(struct sctp_chunkhdr); | |
65205cc4 | 3246 | hdr = (struct sctp_addiphdr *)asconf->skb->data; |
1da177e4 LT |
3247 | serial = ntohl(hdr->serial); |
3248 | ||
d808ad9a | 3249 | /* Skip the addiphdr and store a pointer to address parameter. */ |
65205cc4 | 3250 | length = sizeof(*hdr); |
1da177e4 LT |
3251 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3252 | chunk_len -= length; | |
3253 | ||
3254 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3255 | * asconf parameter. |
d808ad9a | 3256 | */ |
6a435732 | 3257 | length = ntohs(addr_param->p.length); |
1da177e4 LT |
3258 | chunk_len -= length; |
3259 | ||
d808ad9a | 3260 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3261 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3262 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3263 | * parameters. |
1da177e4 | 3264 | */ |
2cab86be | 3265 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3266 | if (!asconf_ack) |
3267 | goto done; | |
3268 | ||
3269 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3270 | sctp_walk_params(param, addip, addip_hdr.params) { |
3271 | /* Skip preceeding address parameters. */ | |
3272 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3273 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3274 | continue; | |
3275 | ||
1da177e4 | 3276 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3277 | param.addip); |
1da177e4 LT |
3278 | /* ADDIP 4.1 A7) |
3279 | * If an error response is received for a TLV parameter, | |
3280 | * all TLVs with no response before the failed TLV are | |
3281 | * considered successful if not reported. All TLVs after | |
3282 | * the failed response are considered unsuccessful unless | |
3283 | * a specific success indication is present for the parameter. | |
3284 | */ | |
9de7922b DB |
3285 | if (err_code != SCTP_ERROR_NO_ERROR) |
3286 | all_param_pass = false; | |
1da177e4 | 3287 | if (!all_param_pass) |
9de7922b DB |
3288 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3289 | err_code, param.addip); | |
1da177e4 LT |
3290 | |
3291 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3292 | * an IP address sends an 'Out of Resource' in its response, it | |
3293 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3294 | * in the ASCONF. |
1da177e4 | 3295 | */ |
9de7922b | 3296 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3297 | goto done; |
1da177e4 | 3298 | } |
1da177e4 LT |
3299 | done: |
3300 | asoc->peer.addip_serial++; | |
3301 | ||
3302 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3303 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3304 | */ |
3305 | if (asconf_ack) { | |
1da177e4 | 3306 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3307 | list_add_tail(&asconf_ack->transmitted_list, |
3308 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3309 | } |
3310 | ||
3311 | return asconf_ack; | |
3312 | } | |
3313 | ||
3314 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3315 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
8b32f234 | 3316 | struct sctp_addip_param *asconf_param) |
1da177e4 | 3317 | { |
1da177e4 LT |
3318 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
3319 | union sctp_addr_param *addr_param; | |
dc022a98 | 3320 | struct sctp_sockaddr_entry *saddr; |
327c0dab XL |
3321 | struct sctp_transport *transport; |
3322 | union sctp_addr addr; | |
3323 | struct sctp_af *af; | |
1da177e4 | 3324 | |
8b32f234 | 3325 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
1da177e4 LT |
3326 | |
3327 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3328 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3329 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3330 | |
3331 | switch (asconf_param->param_hdr.type) { | |
3332 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3333 | /* This is always done in BH context with a socket lock |
3334 | * held, so the list can not change. | |
3335 | */ | |
0ed90fb0 | 3336 | local_bh_disable(); |
559cf710 | 3337 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3338 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3339 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3340 | } |
0ed90fb0 | 3341 | local_bh_enable(); |
3cd9749c WY |
3342 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3343 | transports) { | |
c86a773c | 3344 | sctp_transport_dst_release(transport); |
3cd9749c | 3345 | } |
1da177e4 LT |
3346 | break; |
3347 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3348 | local_bh_disable(); |
425e0f68 | 3349 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3350 | if (asoc->asconf_addr_del_pending != NULL && |
3351 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3352 | kfree(asoc->asconf_addr_del_pending); | |
3353 | asoc->asconf_addr_del_pending = NULL; | |
3354 | } | |
0ed90fb0 | 3355 | local_bh_enable(); |
9dbc15f0 RD |
3356 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3357 | transports) { | |
c86a773c | 3358 | sctp_transport_dst_release(transport); |
1da177e4 LT |
3359 | } |
3360 | break; | |
3361 | default: | |
3362 | break; | |
3363 | } | |
1da177e4 LT |
3364 | } |
3365 | ||
3366 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3367 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3368 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3369 | * ADDIP 4.1 |
3370 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3371 | * response before the failed TLV are considered successful if not reported. | |
3372 | * All TLVs after the failed response are considered unsuccessful unless a | |
3373 | * specific success indication is present for the parameter. | |
3374 | */ | |
dbc16db1 | 3375 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
8b32f234 XL |
3376 | struct sctp_addip_param *asconf_param, |
3377 | int no_err) | |
1da177e4 | 3378 | { |
8b32f234 | 3379 | struct sctp_addip_param *asconf_ack_param; |
327c0dab XL |
3380 | struct sctp_errhdr *err_param; |
3381 | int asconf_ack_len; | |
3382 | __be16 err_code; | |
3383 | int length; | |
1da177e4 LT |
3384 | |
3385 | if (no_err) | |
3386 | err_code = SCTP_ERROR_NO_ERROR; | |
3387 | else | |
3388 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3389 | ||
f3830ccc | 3390 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
922dbc5b | 3391 | sizeof(struct sctp_chunkhdr); |
f3830ccc | 3392 | |
1da177e4 LT |
3393 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3394 | * the first asconf_ack parameter. | |
d808ad9a | 3395 | */ |
65205cc4 | 3396 | length = sizeof(struct sctp_addiphdr); |
8b32f234 XL |
3397 | asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + |
3398 | length); | |
1da177e4 LT |
3399 | asconf_ack_len -= length; |
3400 | ||
3401 | while (asconf_ack_len > 0) { | |
3402 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3403 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3404 | case SCTP_PARAM_SUCCESS_REPORT: |
3405 | return SCTP_ERROR_NO_ERROR; | |
3406 | case SCTP_PARAM_ERR_CAUSE: | |
8b32f234 | 3407 | length = sizeof(*asconf_ack_param); |
ea110733 | 3408 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3409 | asconf_ack_len -= length; |
3410 | if (asconf_ack_len > 0) | |
3411 | return err_param->cause; | |
3412 | else | |
3413 | return SCTP_ERROR_INV_PARAM; | |
3414 | break; | |
3415 | default: | |
3416 | return SCTP_ERROR_INV_PARAM; | |
3417 | } | |
3418 | } | |
3419 | ||
3420 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3421 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3422 | asconf_ack_len -= length; |
3423 | } | |
3424 | ||
3425 | return err_code; | |
3426 | } | |
3427 | ||
3428 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3429 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3430 | struct sctp_chunk *asconf_ack) | |
3431 | { | |
327c0dab XL |
3432 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
3433 | struct sctp_addip_param *asconf_param; | |
3434 | __be16 err_code = SCTP_ERROR_NO_ERROR; | |
3435 | union sctp_addr_param *addr_param; | |
3436 | int asconf_len = asconf->skb->len; | |
3437 | int all_param_pass = 0; | |
3438 | int length = 0; | |
3439 | int no_err = 1; | |
3440 | int retval = 0; | |
1da177e4 LT |
3441 | |
3442 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3443 | * a pointer to address parameter. | |
d808ad9a | 3444 | */ |
68d75469 | 3445 | length = sizeof(struct sctp_addip_chunk); |
1da177e4 LT |
3446 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3447 | asconf_len -= length; | |
3448 | ||
3449 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3450 | * pointer to the first asconf parameter. |
d808ad9a | 3451 | */ |
6a435732 | 3452 | length = ntohs(addr_param->p.length); |
ea110733 | 3453 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3454 | asconf_len -= length; |
3455 | ||
3456 | /* ADDIP 4.1 | |
3457 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3458 | * failures are indicated, then all request(s) are considered | |
3459 | * successful. | |
3460 | */ | |
65205cc4 | 3461 | if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) |
1da177e4 LT |
3462 | all_param_pass = 1; |
3463 | ||
3464 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3465 | while (asconf_len > 0) { | |
3466 | if (all_param_pass) | |
3467 | err_code = SCTP_ERROR_NO_ERROR; | |
3468 | else { | |
3469 | err_code = sctp_get_asconf_response(asconf_ack, | |
3470 | asconf_param, | |
3471 | no_err); | |
3472 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3473 | no_err = 0; | |
3474 | } | |
3475 | ||
3476 | switch (err_code) { | |
3477 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3478 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3479 | break; |
3480 | ||
3481 | case SCTP_ERROR_RSRC_LOW: | |
3482 | retval = 1; | |
3483 | break; | |
3484 | ||
a987f762 | 3485 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3486 | /* Disable sending this type of asconf parameter in |
3487 | * future. | |
d808ad9a | 3488 | */ |
1da177e4 LT |
3489 | asoc->peer.addip_disabled_mask |= |
3490 | asconf_param->param_hdr.type; | |
3491 | break; | |
3492 | ||
3493 | case SCTP_ERROR_REQ_REFUSED: | |
3494 | case SCTP_ERROR_DEL_LAST_IP: | |
3495 | case SCTP_ERROR_DEL_SRC_IP: | |
3496 | default: | |
3497 | break; | |
3498 | } | |
3499 | ||
3500 | /* Skip the processed asconf parameter and move to the next | |
3501 | * one. | |
d808ad9a | 3502 | */ |
1da177e4 | 3503 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3504 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3505 | asconf_len -= length; |
3506 | } | |
3507 | ||
ddc4bbee | 3508 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3509 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3510 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3511 | } | |
8a07eb0a | 3512 | |
1da177e4 | 3513 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3514 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3515 | sctp_chunk_free(asconf); |
3516 | asoc->addip_last_asconf = NULL; | |
3517 | ||
1da177e4 LT |
3518 | return retval; |
3519 | } | |
3520 | ||
d808ad9a | 3521 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3522 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3523 | __u32 new_cum_tsn, size_t nstreams, | |
3524 | struct sctp_fwdtsn_skip *skiplist) | |
3525 | { | |
3526 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3527 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3528 | struct sctp_fwdtsn_skip skip; |
3529 | size_t hint; | |
3530 | int i; | |
3531 | ||
3532 | hint = (nstreams + 1) * sizeof(__u32); | |
3533 | ||
cea8768f | 3534 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3535 | |
3536 | if (!retval) | |
3537 | return NULL; | |
3538 | ||
1da177e4 LT |
3539 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3540 | retval->subh.fwdtsn_hdr = | |
3541 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3542 | ||
3543 | for (i = 0; i < nstreams; i++) { | |
3544 | skip.stream = skiplist[i].stream; | |
3545 | skip.ssn = skiplist[i].ssn; | |
3546 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3547 | } | |
3548 | ||
3549 | return retval; | |
3550 | } | |
cc16f00f | 3551 | |
2d07a49a XL |
3552 | struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, |
3553 | __u32 new_cum_tsn, size_t nstreams, | |
3554 | struct sctp_ifwdtsn_skip *skiplist) | |
3555 | { | |
3556 | struct sctp_chunk *retval = NULL; | |
3557 | struct sctp_ifwdtsn_hdr ftsn_hdr; | |
3558 | size_t hint; | |
3559 | ||
3560 | hint = (nstreams + 1) * sizeof(__u32); | |
3561 | ||
3562 | retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, | |
3563 | GFP_ATOMIC); | |
3564 | if (!retval) | |
3565 | return NULL; | |
3566 | ||
3567 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); | |
3568 | retval->subh.ifwdtsn_hdr = | |
3569 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3570 | ||
3571 | sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); | |
3572 | ||
3573 | return retval; | |
3574 | } | |
3575 | ||
cc16f00f XL |
3576 | /* RE-CONFIG 3.1 (RE-CONFIG chunk) |
3577 | * 0 1 2 3 | |
3578 | * 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 | |
3579 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3580 | * | Type = 130 | Chunk Flags | Chunk Length | | |
3581 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3582 | * \ \ | |
3583 | * / Re-configuration Parameter / | |
3584 | * \ \ | |
3585 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3586 | * \ \ | |
3587 | * / Re-configuration Parameter (optional) / | |
3588 | * \ \ | |
3589 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3590 | */ | |
327c0dab XL |
3591 | static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, |
3592 | int length) | |
cc16f00f XL |
3593 | { |
3594 | struct sctp_reconf_chunk *reconf; | |
3595 | struct sctp_chunk *retval; | |
3596 | ||
3597 | retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, | |
3598 | GFP_ATOMIC); | |
3599 | if (!retval) | |
3600 | return NULL; | |
3601 | ||
3602 | reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; | |
3603 | retval->param_hdr.v = reconf->params; | |
3604 | ||
3605 | return retval; | |
3606 | } | |
3607 | ||
3608 | /* RE-CONFIG 4.1 (STREAM OUT RESET) | |
3609 | * 0 1 2 3 | |
3610 | * 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 | |
3611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3612 | * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | | |
3613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3614 | * | Re-configuration Request Sequence Number | | |
3615 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3616 | * | Re-configuration Response Sequence Number | | |
3617 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3618 | * | Sender's Last Assigned TSN | | |
3619 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3620 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3621 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3622 | * / ...... / | |
3623 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3624 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3625 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3626 | * | |
3627 | * RE-CONFIG 4.2 (STREAM IN RESET) | |
3628 | * 0 1 2 3 | |
3629 | * 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 | |
3630 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3631 | * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | | |
3632 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3633 | * | Re-configuration Request Sequence Number | | |
3634 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3635 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3636 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3637 | * / ...... / | |
3638 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3639 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3640 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3641 | */ | |
3642 | struct sctp_chunk *sctp_make_strreset_req( | |
327c0dab | 3643 | const struct sctp_association *asoc, |
1da4fc97 | 3644 | __u16 stream_num, __be16 *stream_list, |
327c0dab | 3645 | bool out, bool in) |
cc16f00f | 3646 | { |
423852f8 | 3647 | __u16 stream_len = stream_num * sizeof(__u16); |
cc16f00f | 3648 | struct sctp_strreset_outreq outreq; |
cc16f00f XL |
3649 | struct sctp_strreset_inreq inreq; |
3650 | struct sctp_chunk *retval; | |
16e1a919 | 3651 | __u16 outlen, inlen; |
cc16f00f XL |
3652 | |
3653 | outlen = (sizeof(outreq) + stream_len) * out; | |
3654 | inlen = (sizeof(inreq) + stream_len) * in; | |
3655 | ||
3656 | retval = sctp_make_reconf(asoc, outlen + inlen); | |
3657 | if (!retval) | |
3658 | return NULL; | |
3659 | ||
cc16f00f XL |
3660 | if (outlen) { |
3661 | outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; | |
3662 | outreq.param_hdr.length = htons(outlen); | |
3663 | outreq.request_seq = htonl(asoc->strreset_outseq); | |
3664 | outreq.response_seq = htonl(asoc->strreset_inseq - 1); | |
3665 | outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); | |
3666 | ||
3667 | sctp_addto_chunk(retval, sizeof(outreq), &outreq); | |
3668 | ||
3669 | if (stream_len) | |
3670 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3671 | } | |
3672 | ||
3673 | if (inlen) { | |
3674 | inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; | |
3675 | inreq.param_hdr.length = htons(inlen); | |
3676 | inreq.request_seq = htonl(asoc->strreset_outseq + out); | |
3677 | ||
3678 | sctp_addto_chunk(retval, sizeof(inreq), &inreq); | |
3679 | ||
3680 | if (stream_len) | |
3681 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3682 | } | |
3683 | ||
cc16f00f XL |
3684 | return retval; |
3685 | } | |
c56480a1 XL |
3686 | |
3687 | /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) | |
3688 | * 0 1 2 3 | |
3689 | * 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 | |
3690 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3691 | * | Parameter Type = 15 | Parameter Length = 8 | | |
3692 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3693 | * | Re-configuration Request Sequence Number | | |
3694 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3695 | */ | |
3696 | struct sctp_chunk *sctp_make_strreset_tsnreq( | |
327c0dab | 3697 | const struct sctp_association *asoc) |
c56480a1 XL |
3698 | { |
3699 | struct sctp_strreset_tsnreq tsnreq; | |
3700 | __u16 length = sizeof(tsnreq); | |
3701 | struct sctp_chunk *retval; | |
3702 | ||
3703 | retval = sctp_make_reconf(asoc, length); | |
3704 | if (!retval) | |
3705 | return NULL; | |
3706 | ||
3707 | tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; | |
3708 | tsnreq.param_hdr.length = htons(length); | |
3709 | tsnreq.request_seq = htonl(asoc->strreset_outseq); | |
3710 | ||
3711 | sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); | |
3712 | ||
3713 | return retval; | |
3714 | } | |
78098117 XL |
3715 | |
3716 | /* RE-CONFIG 4.5/4.6 (ADD STREAM) | |
3717 | * 0 1 2 3 | |
3718 | * 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 | |
3719 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3720 | * | Parameter Type = 17 | Parameter Length = 12 | | |
3721 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3722 | * | Re-configuration Request Sequence Number | | |
3723 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3724 | * | Number of new streams | Reserved | | |
3725 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3726 | */ | |
3727 | struct sctp_chunk *sctp_make_strreset_addstrm( | |
327c0dab XL |
3728 | const struct sctp_association *asoc, |
3729 | __u16 out, __u16 in) | |
78098117 XL |
3730 | { |
3731 | struct sctp_strreset_addstrm addstrm; | |
3732 | __u16 size = sizeof(addstrm); | |
3733 | struct sctp_chunk *retval; | |
3734 | ||
3735 | retval = sctp_make_reconf(asoc, (!!out + !!in) * size); | |
3736 | if (!retval) | |
3737 | return NULL; | |
3738 | ||
3739 | if (out) { | |
3740 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; | |
3741 | addstrm.param_hdr.length = htons(size); | |
3742 | addstrm.number_of_streams = htons(out); | |
3743 | addstrm.request_seq = htonl(asoc->strreset_outseq); | |
3744 | addstrm.reserved = 0; | |
3745 | ||
3746 | sctp_addto_chunk(retval, size, &addstrm); | |
3747 | } | |
3748 | ||
3749 | if (in) { | |
3750 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; | |
3751 | addstrm.param_hdr.length = htons(size); | |
3752 | addstrm.number_of_streams = htons(in); | |
3753 | addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); | |
3754 | addstrm.reserved = 0; | |
3755 | ||
3756 | sctp_addto_chunk(retval, size, &addstrm); | |
3757 | } | |
3758 | ||
3759 | return retval; | |
3760 | } | |
bd4b9f8b XL |
3761 | |
3762 | /* RE-CONFIG 4.4 (RESP) | |
3763 | * 0 1 2 3 | |
3764 | * 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 | |
3765 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3766 | * | Parameter Type = 16 | Parameter Length | | |
3767 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3768 | * | Re-configuration Response Sequence Number | | |
3769 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3770 | * | Result | | |
3771 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3772 | */ | |
327c0dab XL |
3773 | struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, |
3774 | __u32 result, __u32 sn) | |
bd4b9f8b XL |
3775 | { |
3776 | struct sctp_strreset_resp resp; | |
3777 | __u16 length = sizeof(resp); | |
3778 | struct sctp_chunk *retval; | |
3779 | ||
3780 | retval = sctp_make_reconf(asoc, length); | |
3781 | if (!retval) | |
3782 | return NULL; | |
3783 | ||
3784 | resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3785 | resp.param_hdr.length = htons(length); | |
3786 | resp.response_seq = htonl(sn); | |
3787 | resp.result = htonl(result); | |
3788 | ||
3789 | sctp_addto_chunk(retval, sizeof(resp), &resp); | |
3790 | ||
3791 | return retval; | |
3792 | } | |
3793 | ||
3794 | /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) | |
3795 | * 0 1 2 3 | |
3796 | * 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 | |
3797 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3798 | * | Parameter Type = 16 | Parameter Length | | |
3799 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3800 | * | Re-configuration Response Sequence Number | | |
3801 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3802 | * | Result | | |
3803 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3804 | * | Sender's Next TSN (optional) | | |
3805 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3806 | * | Receiver's Next TSN (optional) | | |
3807 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3808 | */ | |
327c0dab XL |
3809 | struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, |
3810 | __u32 result, __u32 sn, | |
3811 | __u32 sender_tsn, | |
3812 | __u32 receiver_tsn) | |
bd4b9f8b XL |
3813 | { |
3814 | struct sctp_strreset_resptsn tsnresp; | |
3815 | __u16 length = sizeof(tsnresp); | |
3816 | struct sctp_chunk *retval; | |
3817 | ||
3818 | retval = sctp_make_reconf(asoc, length); | |
3819 | if (!retval) | |
3820 | return NULL; | |
3821 | ||
3822 | tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3823 | tsnresp.param_hdr.length = htons(length); | |
3824 | ||
3825 | tsnresp.response_seq = htonl(sn); | |
3826 | tsnresp.result = htonl(result); | |
3827 | tsnresp.senders_next_tsn = htonl(sender_tsn); | |
3828 | tsnresp.receivers_next_tsn = htonl(receiver_tsn); | |
3829 | ||
3830 | sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); | |
3831 | ||
3832 | return retval; | |
3833 | } | |
ea625043 XL |
3834 | |
3835 | bool sctp_verify_reconf(const struct sctp_association *asoc, | |
3836 | struct sctp_chunk *chunk, | |
3837 | struct sctp_paramhdr **errp) | |
3838 | { | |
3839 | struct sctp_reconf_chunk *hdr; | |
3840 | union sctp_params param; | |
1da4fc97 XL |
3841 | __be16 last = 0; |
3842 | __u16 cnt = 0; | |
ea625043 XL |
3843 | |
3844 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3845 | sctp_walk_params(param, hdr, params) { | |
3846 | __u16 length = ntohs(param.p->length); | |
3847 | ||
3848 | *errp = param.p; | |
3849 | if (cnt++ > 2) | |
3850 | return false; | |
3851 | switch (param.p->type) { | |
3852 | case SCTP_PARAM_RESET_OUT_REQUEST: | |
3853 | if (length < sizeof(struct sctp_strreset_outreq) || | |
3854 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3855 | last != SCTP_PARAM_RESET_IN_REQUEST)) | |
3856 | return false; | |
3857 | break; | |
3858 | case SCTP_PARAM_RESET_IN_REQUEST: | |
3859 | if (length < sizeof(struct sctp_strreset_inreq) || | |
3860 | (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3861 | return false; | |
3862 | break; | |
3863 | case SCTP_PARAM_RESET_RESPONSE: | |
3864 | if ((length != sizeof(struct sctp_strreset_resp) && | |
3865 | length != sizeof(struct sctp_strreset_resptsn)) || | |
3866 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3867 | last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3868 | return false; | |
3869 | break; | |
3870 | case SCTP_PARAM_RESET_TSN_REQUEST: | |
3871 | if (length != | |
3872 | sizeof(struct sctp_strreset_tsnreq) || last) | |
3873 | return false; | |
3874 | break; | |
3875 | case SCTP_PARAM_RESET_ADD_IN_STREAMS: | |
3876 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3877 | (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) | |
3878 | return false; | |
3879 | break; | |
3880 | case SCTP_PARAM_RESET_ADD_OUT_STREAMS: | |
3881 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3882 | (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) | |
3883 | return false; | |
3884 | break; | |
3885 | default: | |
3886 | return false; | |
3887 | } | |
3888 | ||
3889 | last = param.p->type; | |
3890 | } | |
3891 | ||
3892 | return true; | |
3893 | } |