]>
Commit | Line | Data |
---|---|---|
47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001-2002 Intel Corp. | |
7 | * | |
60c778b2 | 8 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
9 | * |
10 | * These functions work with the state functions in sctp_sm_statefuns.c | |
11 | * to implement the state operations. These functions implement the | |
12 | * steps which require modifying existing data structures. | |
13 | * | |
1da177e4 LT |
14 | * Please send any bug reports or fixes you make to the |
15 | * email address(es): | |
91705c61 | 16 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 17 | * |
1da177e4 LT |
18 | * Written or modified by: |
19 | * La Monte H.P. Yarroll <piggy@acm.org> | |
20 | * Karl Knutson <karl@athena.chicago.il.us> | |
21 | * C. Robin <chris@hundredacre.ac.uk> | |
22 | * Jon Grimm <jgrimm@us.ibm.com> | |
23 | * Xingang Guo <xingang.guo@intel.com> | |
24 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
25 | * Sridhar Samudrala <sri@us.ibm.com> | |
26 | * Daisy Chang <daisyc@us.ibm.com> | |
27 | * Ardelle Fan <ardelle.fan@intel.com> | |
28 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
29 | */ |
30 | ||
145ce502 JP |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5821c769 | 33 | #include <crypto/hash.h> |
1da177e4 LT |
34 | #include <linux/types.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/ip.h> | |
37 | #include <linux/ipv6.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/inet.h> | |
ebc3bbcf | 40 | #include <linux/scatterlist.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | #include <net/sock.h> |
43 | ||
44 | #include <linux/skbuff.h> | |
45 | #include <linux/random.h> /* for get_random_bytes */ | |
46 | #include <net/sctp/sctp.h> | |
47 | #include <net/sctp/sm.h> | |
48 | ||
072017b4 | 49 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
50 | __u8 type, __u8 flags, int paylen, |
51 | gfp_t gfp); | |
072017b4 | 52 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 53 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 54 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
55 | __u8 type, __u8 flags, int paylen, |
56 | gfp_t gfp); | |
f48ef4c7 XL |
57 | static struct sctp_cookie_param *sctp_pack_cookie( |
58 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
59 | const struct sctp_association *asoc, |
60 | const struct sctp_chunk *init_chunk, | |
61 | int *cookie_len, | |
62 | const __u8 *raw_addrs, int addrs_len); | |
63 | static int sctp_process_param(struct sctp_association *asoc, | |
64 | union sctp_params param, | |
65 | const union sctp_addr *peer_addr, | |
dd0fc66f | 66 | gfp_t gfp); |
8ee4be37 VY |
67 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
68 | const void *data); | |
1da177e4 | 69 | |
072017b4 VY |
70 | /* Control chunk destructor */ |
71 | static void sctp_control_release_owner(struct sk_buff *skb) | |
72 | { | |
1b1e0bc9 XL |
73 | struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg; |
74 | ||
ec2e506c XL |
75 | if (chunk->shkey) { |
76 | struct sctp_shared_key *shkey = chunk->shkey; | |
77 | struct sctp_association *asoc = chunk->asoc; | |
78 | ||
79 | /* refcnt == 2 and !list_empty mean after this release, it's | |
80 | * not being used anywhere, and it's time to notify userland | |
81 | * that this shkey can be freed if it's been deactivated. | |
82 | */ | |
83 | if (shkey->deactivated && !list_empty(&shkey->key_list) && | |
84 | refcount_read(&shkey->refcnt) == 2) { | |
85 | struct sctp_ulpevent *ev; | |
86 | ||
87 | ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id, | |
88 | SCTP_AUTH_FREE_KEY, | |
89 | GFP_KERNEL); | |
90 | if (ev) | |
91 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
92 | } | |
1b1e0bc9 | 93 | sctp_auth_shkey_release(chunk->shkey); |
ec2e506c | 94 | } |
072017b4 VY |
95 | } |
96 | ||
97 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
98 | { | |
99 | struct sctp_association *asoc = chunk->asoc; | |
100 | struct sk_buff *skb = chunk->skb; | |
101 | ||
102 | /* TODO: properly account for control chunks. | |
103 | * To do it right we'll need: | |
104 | * 1) endpoint if association isn't known. | |
105 | * 2) proper memory accounting. | |
106 | * | |
107 | * For now don't do anything for now. | |
108 | */ | |
1b1e0bc9 XL |
109 | if (chunk->auth) { |
110 | chunk->shkey = asoc->shkey; | |
111 | sctp_auth_shkey_hold(chunk->shkey); | |
112 | } | |
072017b4 | 113 | skb->sk = asoc ? asoc->base.sk : NULL; |
1b1e0bc9 | 114 | skb_shinfo(skb)->destructor_arg = chunk; |
072017b4 VY |
115 | skb->destructor = sctp_control_release_owner; |
116 | } | |
117 | ||
1da177e4 LT |
118 | /* What was the inbound interface for this chunk? */ |
119 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
120 | { | |
e7487c86 | 121 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 122 | |
e7487c86 | 123 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
124 | } |
125 | ||
126 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
127 | * | |
128 | * Note 2: The ECN capable field is reserved for future use of | |
129 | * Explicit Congestion Notification. | |
130 | */ | |
131 | static const struct sctp_paramhdr ecap_param = { | |
132 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 133 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
134 | }; |
135 | static const struct sctp_paramhdr prsctp_param = { | |
136 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 137 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
138 | }; |
139 | ||
8914f4ba MRL |
140 | /* A helper to initialize an op error inside a provided chunk, as most |
141 | * cause codes will be embedded inside an abort chunk. | |
1da177e4 | 142 | */ |
6d3e8aa8 MRL |
143 | int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
144 | size_t paylen) | |
1da177e4 | 145 | { |
d8238d9d | 146 | struct sctp_errhdr err; |
1da177e4 LT |
147 | __u16 len; |
148 | ||
d808ad9a | 149 | /* Cause code constants are now defined in network order. */ |
1da177e4 | 150 | err.cause = cause_code; |
d8238d9d | 151 | len = sizeof(err) + paylen; |
6d3e8aa8 MRL |
152 | err.length = htons(len); |
153 | ||
154 | if (skb_tailroom(chunk->skb) < len) | |
155 | return -ENOSPC; | |
156 | ||
d8238d9d | 157 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); |
6d3e8aa8 MRL |
158 | |
159 | return 0; | |
1da177e4 LT |
160 | } |
161 | ||
162 | /* 3.3.2 Initiation (INIT) (1) | |
163 | * | |
164 | * This chunk is used to initiate a SCTP association between two | |
165 | * endpoints. The format of the INIT chunk is shown below: | |
166 | * | |
167 | * 0 1 2 3 | |
168 | * 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 | |
169 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
170 | * | Type = 1 | Chunk Flags | Chunk Length | | |
171 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
172 | * | Initiate Tag | | |
173 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
174 | * | Advertised Receiver Window Credit (a_rwnd) | | |
175 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
176 | * | Number of Outbound Streams | Number of Inbound Streams | | |
177 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
178 | * | Initial TSN | | |
179 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
180 | * \ \ | |
181 | * / Optional/Variable-Length Parameters / | |
182 | * \ \ | |
183 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
184 | * | |
185 | * | |
186 | * The INIT chunk contains the following parameters. Unless otherwise | |
187 | * noted, each parameter MUST only be included once in the INIT chunk. | |
188 | * | |
189 | * Fixed Parameters Status | |
190 | * ---------------------------------------------- | |
191 | * Initiate Tag Mandatory | |
192 | * Advertised Receiver Window Credit Mandatory | |
193 | * Number of Outbound Streams Mandatory | |
194 | * Number of Inbound Streams Mandatory | |
195 | * Initial TSN Mandatory | |
196 | * | |
197 | * Variable Parameters Status Type Value | |
198 | * ------------------------------------------------------------- | |
199 | * IPv4 Address (Note 1) Optional 5 | |
200 | * IPv6 Address (Note 1) Optional 6 | |
201 | * Cookie Preservative Optional 9 | |
202 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
203 | * Host Name Address (Note 3) Optional 11 | |
204 | * Supported Address Types (Note 4) Optional 12 | |
205 | */ | |
206 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
327c0dab XL |
207 | const struct sctp_bind_addr *bp, |
208 | gfp_t gfp, int vparam_len) | |
1da177e4 | 209 | { |
327c0dab XL |
210 | struct sctp_supported_ext_param ext_param; |
211 | struct sctp_adaptation_ind_param aiparam; | |
212 | struct sctp_paramhdr *auth_chunks = NULL; | |
213 | struct sctp_paramhdr *auth_hmacs = NULL; | |
214 | struct sctp_supported_addrs_param sat; | |
b14878cc | 215 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
216 | struct sctp_chunk *retval = NULL; |
217 | int num_types, addrs_len = 0; | |
327c0dab XL |
218 | struct sctp_inithdr init; |
219 | union sctp_params addrs; | |
1da177e4 | 220 | struct sctp_sock *sp; |
96b120b3 | 221 | __u8 extensions[5]; |
327c0dab | 222 | size_t chunksize; |
3dbe8656 | 223 | __be16 types[2]; |
131a47e3 | 224 | int num_ext = 0; |
1da177e4 LT |
225 | |
226 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
227 | * | |
228 | * Note 1: The INIT chunks can contain multiple addresses that | |
229 | * can be IPv4 and/or IPv6 in any combination. | |
230 | */ | |
1da177e4 LT |
231 | |
232 | /* Convert the provided bind address list to raw format. */ | |
233 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
234 | ||
235 | init.init_tag = htonl(asoc->c.my_vtag); | |
236 | init.a_rwnd = htonl(asoc->rwnd); | |
237 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
238 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
239 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
240 | ||
241 | /* How many address types are needed? */ | |
242 | sp = sctp_sk(asoc->base.sk); | |
243 | num_types = sp->pf->supported_addrs(sp, types); | |
244 | ||
a8170c35 | 245 | chunksize = sizeof(init) + addrs_len; |
e2f036a9 | 246 | chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); |
1b0b8114 XL |
247 | |
248 | if (asoc->ep->ecn_enable) | |
249 | chunksize += sizeof(ecap_param); | |
8ee4be37 | 250 | |
1c134753 | 251 | if (asoc->ep->prsctp_enable) |
036b579b VY |
252 | chunksize += sizeof(prsctp_param); |
253 | ||
131a47e3 VY |
254 | /* ADDIP: Section 4.2.7: |
255 | * An implementation supporting this extension [ADDIP] MUST list | |
256 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
257 | * INIT-ACK parameters. | |
131a47e3 | 258 | */ |
4e27428f | 259 | if (asoc->ep->asconf_enable) { |
131a47e3 VY |
260 | extensions[num_ext] = SCTP_CID_ASCONF; |
261 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
262 | num_ext += 2; | |
263 | } | |
264 | ||
a96701fb | 265 | if (asoc->ep->reconf_enable) { |
c28445c3 XL |
266 | extensions[num_ext] = SCTP_CID_RECONF; |
267 | num_ext += 1; | |
268 | } | |
269 | ||
6fc791ee | 270 | if (sp->adaptation_ind) |
271 | chunksize += sizeof(aiparam); | |
272 | ||
e55f4b8b | 273 | if (asoc->ep->intl_enable) { |
96b120b3 XL |
274 | extensions[num_ext] = SCTP_CID_I_DATA; |
275 | num_ext += 1; | |
276 | } | |
277 | ||
1da177e4 LT |
278 | chunksize += vparam_len; |
279 | ||
730fc3d0 | 280 | /* Account for AUTH related parameters */ |
b14878cc | 281 | if (ep->auth_enable) { |
730fc3d0 VY |
282 | /* Add random parameter length*/ |
283 | chunksize += sizeof(asoc->c.auth_random); | |
284 | ||
285 | /* Add HMACS parameter length if any were defined */ | |
3c918704 | 286 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 287 | if (auth_hmacs->length) |
e2f036a9 | 288 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
289 | else |
290 | auth_hmacs = NULL; | |
291 | ||
292 | /* Add CHUNKS parameter length */ | |
3c918704 | 293 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 294 | if (auth_chunks->length) |
e2f036a9 | 295 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 | 296 | else |
9baffaa6 | 297 | auth_chunks = NULL; |
730fc3d0 VY |
298 | |
299 | extensions[num_ext] = SCTP_CID_AUTH; | |
300 | num_ext += 1; | |
301 | } | |
302 | ||
131a47e3 VY |
303 | /* If we have any extensions to report, account for that */ |
304 | if (num_ext) | |
15328d9f | 305 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
131a47e3 | 306 | |
1da177e4 LT |
307 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
308 | * | |
309 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
310 | * Name address parameter. Moreover, the sender of the INIT | |
311 | * MUST NOT combine any other address types with the Host Name | |
312 | * address in the INIT. The receiver of INIT MUST ignore any | |
313 | * other address types if the Host Name address parameter is | |
314 | * present in the received INIT chunk. | |
315 | * | |
316 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
317 | */ | |
318 | ||
cea8768f | 319 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); |
1da177e4 LT |
320 | if (!retval) |
321 | goto nodata; | |
322 | ||
323 | retval->subh.init_hdr = | |
324 | sctp_addto_chunk(retval, sizeof(init), &init); | |
325 | retval->param_hdr.v = | |
326 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
327 | ||
328 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
329 | * | |
330 | * Note 4: This parameter, when present, specifies all the | |
331 | * address types the sending endpoint can support. The absence | |
332 | * of this parameter indicates that the sending endpoint can | |
333 | * support any address type. | |
334 | */ | |
335 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
336 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
337 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
338 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
339 | ||
1b0b8114 XL |
340 | if (asoc->ep->ecn_enable) |
341 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 342 | |
7aa1b54b | 343 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
344 | * fist before addiding the parameters for the extensions themselves |
345 | */ | |
346 | if (num_ext) { | |
347 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
348 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
349 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 350 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
351 | } |
352 | ||
1c134753 | 353 | if (asoc->ep->prsctp_enable) |
1da177e4 | 354 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 355 | |
6fc791ee | 356 | if (sp->adaptation_ind) { |
357 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
358 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
359 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
360 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
361 | } | |
131a47e3 | 362 | |
730fc3d0 | 363 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 364 | if (ep->auth_enable) { |
730fc3d0 VY |
365 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
366 | asoc->c.auth_random); | |
367 | if (auth_hmacs) | |
368 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
369 | auth_hmacs); | |
370 | if (auth_chunks) | |
371 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
372 | auth_chunks); | |
373 | } | |
1da177e4 | 374 | nodata: |
a51482bd | 375 | kfree(addrs.v); |
1da177e4 LT |
376 | return retval; |
377 | } | |
378 | ||
379 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
327c0dab XL |
380 | const struct sctp_chunk *chunk, |
381 | gfp_t gfp, int unkparam_len) | |
1da177e4 | 382 | { |
327c0dab XL |
383 | struct sctp_supported_ext_param ext_param; |
384 | struct sctp_adaptation_ind_param aiparam; | |
385 | struct sctp_paramhdr *auth_chunks = NULL; | |
386 | struct sctp_paramhdr *auth_random = NULL; | |
387 | struct sctp_paramhdr *auth_hmacs = NULL; | |
388 | struct sctp_chunk *retval = NULL; | |
389 | struct sctp_cookie_param *cookie; | |
4ae70c08 | 390 | struct sctp_inithdr initack; |
1da177e4 | 391 | union sctp_params addrs; |
6fc791ee | 392 | struct sctp_sock *sp; |
96b120b3 | 393 | __u8 extensions[5]; |
1da177e4 | 394 | size_t chunksize; |
131a47e3 | 395 | int num_ext = 0; |
327c0dab XL |
396 | int cookie_len; |
397 | int addrs_len; | |
1da177e4 LT |
398 | |
399 | /* Note: there may be no addresses to embed. */ | |
400 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
401 | ||
402 | initack.init_tag = htonl(asoc->c.my_vtag); | |
403 | initack.a_rwnd = htonl(asoc->rwnd); | |
404 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
405 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
406 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
407 | ||
408 | /* FIXME: We really ought to build the cookie right | |
409 | * into the packet instead of allocating more fresh memory. | |
410 | */ | |
411 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
412 | addrs.v, addrs_len); | |
413 | if (!cookie) | |
414 | goto nomem_cookie; | |
415 | ||
416 | /* Calculate the total size of allocation, include the reserved | |
417 | * space for reporting unknown parameters if it is specified. | |
418 | */ | |
6fc791ee | 419 | sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
420 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
421 | ||
d808ad9a | 422 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
423 | if (asoc->peer.ecn_capable) |
424 | chunksize += sizeof(ecap_param); | |
425 | ||
5ffad5ac | 426 | if (asoc->peer.prsctp_capable) |
036b579b VY |
427 | chunksize += sizeof(prsctp_param); |
428 | ||
5ffad5ac | 429 | if (asoc->peer.asconf_capable) { |
131a47e3 VY |
430 | extensions[num_ext] = SCTP_CID_ASCONF; |
431 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
432 | num_ext += 2; | |
433 | } | |
434 | ||
c28445c3 XL |
435 | if (asoc->peer.reconf_capable) { |
436 | extensions[num_ext] = SCTP_CID_RECONF; | |
437 | num_ext += 1; | |
438 | } | |
439 | ||
6fc791ee | 440 | if (sp->adaptation_ind) |
441 | chunksize += sizeof(aiparam); | |
1da177e4 | 442 | |
da1f6d4d | 443 | if (asoc->peer.intl_capable) { |
96b120b3 XL |
444 | extensions[num_ext] = SCTP_CID_I_DATA; |
445 | num_ext += 1; | |
446 | } | |
447 | ||
730fc3d0 | 448 | if (asoc->peer.auth_capable) { |
3c918704 | 449 | auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; |
730fc3d0 VY |
450 | chunksize += ntohs(auth_random->length); |
451 | ||
3c918704 | 452 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 453 | if (auth_hmacs->length) |
e2f036a9 | 454 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
455 | else |
456 | auth_hmacs = NULL; | |
457 | ||
3c918704 | 458 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 459 | if (auth_chunks->length) |
e2f036a9 | 460 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 VY |
461 | else |
462 | auth_chunks = NULL; | |
463 | ||
464 | extensions[num_ext] = SCTP_CID_AUTH; | |
465 | num_ext += 1; | |
466 | } | |
467 | ||
8ee4be37 | 468 | if (num_ext) |
15328d9f | 469 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
8ee4be37 | 470 | |
1da177e4 | 471 | /* Now allocate and fill out the chunk. */ |
cea8768f | 472 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
473 | if (!retval) |
474 | goto nomem_chunk; | |
475 | ||
b99a4d53 DC |
476 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
477 | * | |
478 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
479 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
480 | * address from which it received the DATA or control chunk | |
481 | * to which it is replying. | |
482 | * | |
483 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 | 484 | */ |
4ff40b86 XL |
485 | if (chunk->transport) |
486 | retval->transport = | |
487 | sctp_assoc_lookup_paddr(asoc, | |
488 | &chunk->transport->ipaddr); | |
b99a4d53 | 489 | |
1da177e4 LT |
490 | retval->subh.init_hdr = |
491 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
492 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
493 | sctp_addto_chunk(retval, cookie_len, cookie); | |
494 | if (asoc->peer.ecn_capable) | |
495 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
496 | if (num_ext) { |
497 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
498 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
499 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 500 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 501 | } |
1da177e4 LT |
502 | if (asoc->peer.prsctp_capable) |
503 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
504 | ||
6fc791ee | 505 | if (sp->adaptation_ind) { |
506 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
507 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
508 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
509 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
510 | } | |
1da177e4 | 511 | |
730fc3d0 VY |
512 | if (asoc->peer.auth_capable) { |
513 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
514 | auth_random); | |
515 | if (auth_hmacs) | |
516 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
517 | auth_hmacs); | |
518 | if (auth_chunks) | |
519 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
520 | auth_chunks); | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* We need to remove the const qualifier at this point. */ |
524 | retval->asoc = (struct sctp_association *) asoc; | |
525 | ||
1da177e4 LT |
526 | nomem_chunk: |
527 | kfree(cookie); | |
528 | nomem_cookie: | |
a51482bd | 529 | kfree(addrs.v); |
1da177e4 LT |
530 | return retval; |
531 | } | |
532 | ||
533 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
534 | * | |
535 | * This chunk is used only during the initialization of an association. | |
536 | * It is sent by the initiator of an association to its peer to complete | |
537 | * the initialization process. This chunk MUST precede any DATA chunk | |
538 | * sent within the association, but MAY be bundled with one or more DATA | |
539 | * chunks in the same packet. | |
540 | * | |
541 | * 0 1 2 3 | |
542 | * 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 | |
543 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
544 | * | Type = 10 |Chunk Flags | Length | | |
545 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
546 | * / Cookie / | |
547 | * \ \ | |
548 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
549 | * | |
550 | * Chunk Flags: 8 bit | |
551 | * | |
552 | * Set to zero on transmit and ignored on receipt. | |
553 | * | |
554 | * Length: 16 bits (unsigned integer) | |
555 | * | |
556 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
557 | * the chunk header and the size of the Cookie. | |
558 | * | |
559 | * Cookie: variable size | |
560 | * | |
561 | * This field must contain the exact cookie received in the | |
562 | * State Cookie parameter from the previous INIT ACK. | |
563 | * | |
564 | * An implementation SHOULD make the cookie as small as possible | |
565 | * to insure interoperability. | |
566 | */ | |
567 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
327c0dab | 568 | const struct sctp_chunk *chunk) |
1da177e4 LT |
569 | { |
570 | struct sctp_chunk *retval; | |
1da177e4 | 571 | int cookie_len; |
327c0dab | 572 | void *cookie; |
1da177e4 LT |
573 | |
574 | cookie = asoc->peer.cookie; | |
575 | cookie_len = asoc->peer.cookie_len; | |
576 | ||
577 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
578 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
579 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
580 | if (!retval) |
581 | goto nodata; | |
582 | retval->subh.cookie_hdr = | |
583 | sctp_addto_chunk(retval, cookie_len, cookie); | |
584 | ||
585 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
586 | * | |
587 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
588 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
589 | * address from which it * received the DATA or control chunk | |
590 | * to which it is replying. | |
591 | * | |
592 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
593 | */ | |
594 | if (chunk) | |
595 | retval->transport = chunk->transport; | |
596 | ||
597 | nodata: | |
598 | return retval; | |
599 | } | |
600 | ||
601 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
602 | * | |
603 | * This chunk is used only during the initialization of an | |
604 | * association. It is used to acknowledge the receipt of a COOKIE | |
605 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
606 | * within the association, but MAY be bundled with one or more DATA | |
607 | * chunks or SACK chunk in the same SCTP packet. | |
608 | * | |
609 | * 0 1 2 3 | |
610 | * 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 | |
611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
612 | * | Type = 11 |Chunk Flags | Length = 4 | | |
613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
614 | * | |
615 | * Chunk Flags: 8 bits | |
616 | * | |
617 | * Set to zero on transmit and ignored on receipt. | |
618 | */ | |
619 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
327c0dab | 620 | const struct sctp_chunk *chunk) |
1da177e4 LT |
621 | { |
622 | struct sctp_chunk *retval; | |
623 | ||
cea8768f | 624 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
625 | |
626 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
627 | * | |
628 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
629 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
630 | * address from which it * received the DATA or control chunk | |
631 | * to which it is replying. | |
632 | * | |
633 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
634 | */ | |
4ff40b86 XL |
635 | if (retval && chunk && chunk->transport) |
636 | retval->transport = | |
637 | sctp_assoc_lookup_paddr(asoc, | |
638 | &chunk->transport->ipaddr); | |
1da177e4 LT |
639 | |
640 | return retval; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Appendix A: Explicit Congestion Notification: | |
645 | * CWR: | |
646 | * | |
647 | * RFC 2481 details a specific bit for a sender to send in the header of | |
648 | * its next outbound TCP segment to indicate to its peer that it has | |
649 | * reduced its congestion window. This is termed the CWR bit. For | |
650 | * SCTP the same indication is made by including the CWR chunk. | |
651 | * This chunk contains one data element, i.e. the TSN number that | |
652 | * was sent in the ECNE chunk. This element represents the lowest | |
653 | * TSN number in the datagram that was originally marked with the | |
654 | * CE bit. | |
655 | * | |
656 | * 0 1 2 3 | |
657 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
658 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
659 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
660 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
661 | * | Lowest TSN Number | | |
662 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
663 | * | |
664 | * Note: The CWR is considered a Control chunk. | |
665 | */ | |
666 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
327c0dab XL |
667 | const __u32 lowest_tsn, |
668 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
669 | { |
670 | struct sctp_chunk *retval; | |
65f77105 | 671 | struct sctp_cwrhdr cwr; |
1da177e4 LT |
672 | |
673 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 674 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
65f77105 | 675 | sizeof(cwr), GFP_ATOMIC); |
1da177e4 LT |
676 | |
677 | if (!retval) | |
678 | goto nodata; | |
679 | ||
680 | retval->subh.ecn_cwr_hdr = | |
681 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
682 | ||
683 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
684 | * | |
685 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
686 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
687 | * address from which it * received the DATA or control chunk | |
688 | * to which it is replying. | |
689 | * | |
690 | * [Report a reduced congestion window back to where the ECNE | |
691 | * came from.] | |
692 | */ | |
693 | if (chunk) | |
694 | retval->transport = chunk->transport; | |
695 | ||
696 | nodata: | |
697 | return retval; | |
698 | } | |
699 | ||
700 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
701 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
327c0dab | 702 | const __u32 lowest_tsn) |
1da177e4 LT |
703 | { |
704 | struct sctp_chunk *retval; | |
1fb6d83b | 705 | struct sctp_ecnehdr ecne; |
1da177e4 LT |
706 | |
707 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 708 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
1fb6d83b | 709 | sizeof(ecne), GFP_ATOMIC); |
1da177e4 LT |
710 | if (!retval) |
711 | goto nodata; | |
712 | retval->subh.ecne_hdr = | |
713 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
714 | ||
715 | nodata: | |
716 | return retval; | |
717 | } | |
718 | ||
719 | /* Make a DATA chunk for the given association from the provided | |
720 | * parameters. However, do not populate the data payload. | |
721 | */ | |
0c3f6f65 | 722 | struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, |
327c0dab | 723 | const struct sctp_sndrcvinfo *sinfo, |
0c3f6f65 | 724 | int len, __u8 flags, gfp_t gfp) |
1da177e4 LT |
725 | { |
726 | struct sctp_chunk *retval; | |
727 | struct sctp_datahdr dp; | |
1da177e4 LT |
728 | |
729 | /* We assign the TSN as LATE as possible, not here when | |
730 | * creating the chunk. | |
731 | */ | |
0c3f6f65 XL |
732 | memset(&dp, 0, sizeof(dp)); |
733 | dp.ppid = sinfo->sinfo_ppid; | |
1da177e4 | 734 | dp.stream = htons(sinfo->sinfo_stream); |
1da177e4 LT |
735 | |
736 | /* Set the flags for an unordered send. */ | |
0c3f6f65 | 737 | if (sinfo->sinfo_flags & SCTP_UNORDERED) |
1da177e4 | 738 | flags |= SCTP_DATA_UNORDERED; |
1da177e4 | 739 | |
0c3f6f65 | 740 | retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); |
1da177e4 | 741 | if (!retval) |
0c3f6f65 | 742 | return NULL; |
1da177e4 LT |
743 | |
744 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
745 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
746 | ||
1da177e4 LT |
747 | return retval; |
748 | } | |
749 | ||
750 | /* Create a selective ackowledgement (SACK) for the given | |
751 | * association. This reports on which TSN's we've seen to date, | |
752 | * including duplicates and gaps. | |
753 | */ | |
47b3ba51 | 754 | struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc) |
1da177e4 | 755 | { |
1da177e4 | 756 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
02015180 | 757 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
327c0dab | 758 | __u16 num_gabs, num_dup_tsns; |
4244854d | 759 | struct sctp_transport *trans; |
327c0dab XL |
760 | struct sctp_chunk *retval; |
761 | struct sctp_sackhdr sack; | |
762 | __u32 ctsn; | |
763 | int len; | |
1da177e4 | 764 | |
02015180 | 765 | memset(gabs, 0, sizeof(gabs)); |
1da177e4 | 766 | ctsn = sctp_tsnmap_get_ctsn(map); |
bb33381d DB |
767 | |
768 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); | |
1da177e4 LT |
769 | |
770 | /* How much room is needed in the chunk? */ | |
02015180 | 771 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
1da177e4 LT |
772 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
773 | ||
774 | /* Initialize the SACK header. */ | |
775 | sack.cum_tsn_ack = htonl(ctsn); | |
776 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
777 | sack.num_gap_ack_blocks = htons(num_gabs); | |
778 | sack.num_dup_tsns = htons(num_dup_tsns); | |
779 | ||
780 | len = sizeof(sack) | |
781 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
782 | + sizeof(__u32) * num_dup_tsns; | |
783 | ||
784 | /* Create the chunk. */ | |
cea8768f | 785 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); |
1da177e4 LT |
786 | if (!retval) |
787 | goto nodata; | |
788 | ||
789 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
790 | * | |
791 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
792 | * HEARTBEAT ACK, etc.) to the same destination transport | |
793 | * address from which it received the DATA or control chunk to | |
794 | * which it is replying. This rule should also be followed if | |
795 | * the endpoint is bundling DATA chunks together with the | |
796 | * reply chunk. | |
797 | * | |
798 | * However, when acknowledging multiple DATA chunks received | |
799 | * in packets from different source addresses in a single | |
800 | * SACK, the SACK chunk may be transmitted to one of the | |
801 | * destination transport addresses from which the DATA or | |
802 | * control chunks being acknowledged were received. | |
803 | * | |
804 | * [BUG: We do not implement the following paragraph. | |
805 | * Perhaps we should remember the last transport we used for a | |
806 | * SACK and avoid that (if possible) if we have seen any | |
807 | * duplicates. --piggy] | |
808 | * | |
809 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
810 | * multi- homed endpoint it MAY be beneficial to vary the | |
811 | * destination address and not use the source address of the | |
812 | * DATA chunk. The reason being that receiving a duplicate | |
813 | * from a multi-homed endpoint might indicate that the return | |
814 | * path (as specified in the source address of the DATA chunk) | |
815 | * for the SACK is broken. | |
816 | * | |
817 | * [Send to the address from which we last received a DATA chunk.] | |
818 | */ | |
819 | retval->transport = asoc->peer.last_data_from; | |
820 | ||
821 | retval->subh.sack_hdr = | |
822 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
823 | ||
824 | /* Add the gap ack block information. */ | |
825 | if (num_gabs) | |
826 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
02015180 | 827 | gabs); |
1da177e4 LT |
828 | |
829 | /* Add the duplicate TSN information. */ | |
196d6759 | 830 | if (num_dup_tsns) { |
47b3ba51 | 831 | asoc->stats.idupchunks += num_dup_tsns; |
1da177e4 LT |
832 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
833 | sctp_tsnmap_get_dups(map)); | |
196d6759 | 834 | } |
4244854d NH |
835 | /* Once we have a sack generated, check to see what our sack |
836 | * generation is, if its 0, reset the transports to 0, and reset | |
837 | * the association generation to 1 | |
838 | * | |
839 | * The idea is that zero is never used as a valid generation for the | |
840 | * association so no transport will match after a wrap event like this, | |
841 | * Until the next sack | |
842 | */ | |
47b3ba51 | 843 | if (++asoc->peer.sack_generation == 0) { |
4244854d NH |
844 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
845 | transports) | |
846 | trans->sack_generation = 0; | |
47b3ba51 | 847 | asoc->peer.sack_generation = 1; |
4244854d | 848 | } |
1da177e4 LT |
849 | nodata: |
850 | return retval; | |
851 | } | |
852 | ||
853 | /* Make a SHUTDOWN chunk. */ | |
854 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
855 | const struct sctp_chunk *chunk) | |
856 | { | |
e61e4055 | 857 | struct sctp_shutdownhdr shut; |
1da177e4 | 858 | struct sctp_chunk *retval; |
1da177e4 LT |
859 | __u32 ctsn; |
860 | ||
12dfd78e JL |
861 | if (chunk && chunk->asoc) |
862 | ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map); | |
863 | else | |
864 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
865 | ||
1da177e4 LT |
866 | shut.cum_tsn_ack = htonl(ctsn); |
867 | ||
072017b4 | 868 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
e61e4055 | 869 | sizeof(shut), GFP_ATOMIC); |
1da177e4 LT |
870 | if (!retval) |
871 | goto nodata; | |
872 | ||
873 | retval->subh.shutdown_hdr = | |
874 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
875 | ||
876 | if (chunk) | |
877 | retval->transport = chunk->transport; | |
878 | nodata: | |
879 | return retval; | |
880 | } | |
881 | ||
882 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
327c0dab | 883 | const struct sctp_chunk *chunk) |
1da177e4 LT |
884 | { |
885 | struct sctp_chunk *retval; | |
886 | ||
cea8768f MRL |
887 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
888 | GFP_ATOMIC); | |
1da177e4 LT |
889 | |
890 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
891 | * | |
892 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
893 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
894 | * address from which it * received the DATA or control chunk | |
895 | * to which it is replying. | |
896 | * | |
897 | * [ACK back to where the SHUTDOWN came from.] | |
898 | */ | |
899 | if (retval && chunk) | |
900 | retval->transport = chunk->transport; | |
901 | ||
902 | return retval; | |
903 | } | |
904 | ||
905 | struct sctp_chunk *sctp_make_shutdown_complete( | |
327c0dab XL |
906 | const struct sctp_association *asoc, |
907 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
908 | { |
909 | struct sctp_chunk *retval; | |
910 | __u8 flags = 0; | |
911 | ||
047a2428 JF |
912 | /* Set the T-bit if we have no association (vtag will be |
913 | * reflected) | |
914 | */ | |
1da177e4 LT |
915 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
916 | ||
cea8768f MRL |
917 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
918 | 0, GFP_ATOMIC); | |
1da177e4 LT |
919 | |
920 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
921 | * | |
922 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
923 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
924 | * address from which it * received the DATA or control chunk | |
925 | * to which it is replying. | |
926 | * | |
927 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
928 | * came from.] | |
929 | */ | |
930 | if (retval && chunk) | |
931 | retval->transport = chunk->transport; | |
932 | ||
d808ad9a | 933 | return retval; |
1da177e4 LT |
934 | } |
935 | ||
936 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 937 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
938 | */ |
939 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
327c0dab XL |
940 | const struct sctp_chunk *chunk, |
941 | const size_t hint) | |
1da177e4 LT |
942 | { |
943 | struct sctp_chunk *retval; | |
944 | __u8 flags = 0; | |
945 | ||
047a2428 JF |
946 | /* Set the T-bit if we have no association and 'chunk' is not |
947 | * an INIT (vtag will be reflected). | |
948 | */ | |
949 | if (!asoc) { | |
950 | if (chunk && chunk->chunk_hdr && | |
951 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
952 | flags = 0; | |
953 | else | |
954 | flags = SCTP_CHUNK_FLAG_T; | |
955 | } | |
1da177e4 | 956 | |
cea8768f MRL |
957 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
958 | GFP_ATOMIC); | |
1da177e4 LT |
959 | |
960 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
961 | * | |
962 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
963 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
964 | * address from which it * received the DATA or control chunk | |
965 | * to which it is replying. | |
966 | * | |
967 | * [ABORT back to where the offender came from.] | |
968 | */ | |
969 | if (retval && chunk) | |
970 | retval->transport = chunk->transport; | |
971 | ||
972 | return retval; | |
973 | } | |
974 | ||
975 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
976 | struct sctp_chunk *sctp_make_abort_no_data( | |
327c0dab XL |
977 | const struct sctp_association *asoc, |
978 | const struct sctp_chunk *chunk, | |
979 | __u32 tsn) | |
1da177e4 LT |
980 | { |
981 | struct sctp_chunk *retval; | |
9f81bcd9 | 982 | __be32 payload; |
1da177e4 | 983 | |
d8238d9d XL |
984 | retval = sctp_make_abort(asoc, chunk, |
985 | sizeof(struct sctp_errhdr) + sizeof(tsn)); | |
1da177e4 LT |
986 | |
987 | if (!retval) | |
988 | goto no_mem; | |
989 | ||
990 | /* Put the tsn back into network byte order. */ | |
991 | payload = htonl(tsn); | |
00f1c2df WY |
992 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
993 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
994 | |
995 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
996 | * | |
997 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
998 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
999 | * address from which it * received the DATA or control chunk | |
1000 | * to which it is replying. | |
1001 | * | |
1002 | * [ABORT back to where the offender came from.] | |
1003 | */ | |
1004 | if (chunk) | |
1005 | retval->transport = chunk->transport; | |
1006 | ||
1007 | no_mem: | |
1008 | return retval; | |
1009 | } | |
1010 | ||
1011 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1012 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1013 | struct msghdr *msg, |
c164a9ba | 1014 | size_t paylen) |
1da177e4 LT |
1015 | { |
1016 | struct sctp_chunk *retval; | |
c164a9ba SS |
1017 | void *payload = NULL; |
1018 | int err; | |
1da177e4 | 1019 | |
d8238d9d XL |
1020 | retval = sctp_make_abort(asoc, NULL, |
1021 | sizeof(struct sctp_errhdr) + paylen); | |
1da177e4 LT |
1022 | if (!retval) |
1023 | goto err_chunk; | |
1024 | ||
1025 | if (paylen) { | |
1026 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1027 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1028 | if (!payload) |
1029 | goto err_payload; | |
c164a9ba | 1030 | |
6ce8e9ce | 1031 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1032 | if (err < 0) |
1033 | goto err_copy; | |
1da177e4 LT |
1034 | } |
1035 | ||
00f1c2df WY |
1036 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1037 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1038 | |
1039 | if (paylen) | |
1040 | kfree(payload); | |
1041 | ||
1042 | return retval; | |
1043 | ||
1044 | err_copy: | |
1045 | kfree(payload); | |
1046 | err_payload: | |
1047 | sctp_chunk_free(retval); | |
1048 | retval = NULL; | |
1049 | err_chunk: | |
1050 | return retval; | |
1051 | } | |
1052 | ||
5c94bf86 AB |
1053 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1054 | * enough. | |
1055 | */ | |
1056 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1057 | const void *data) | |
1058 | { | |
5c94bf86 | 1059 | int chunklen = ntohs(chunk->chunk_hdr->length); |
327c0dab | 1060 | void *target; |
5c94bf86 AB |
1061 | |
1062 | target = skb_put(chunk->skb, len); | |
1063 | ||
6383cfb3 VY |
1064 | if (data) |
1065 | memcpy(target, data, len); | |
1066 | else | |
1067 | memset(target, 0, len); | |
5c94bf86 AB |
1068 | |
1069 | /* Adjust the chunk length field. */ | |
1070 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1071 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1072 | ||
1073 | return target; | |
1074 | } | |
1075 | ||
d808ad9a | 1076 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 | 1077 | struct sctp_chunk *sctp_make_abort_violation( |
327c0dab XL |
1078 | const struct sctp_association *asoc, |
1079 | const struct sctp_chunk *chunk, | |
1080 | const __u8 *payload, | |
1081 | const size_t paylen) | |
1da177e4 LT |
1082 | { |
1083 | struct sctp_chunk *retval; | |
1084 | struct sctp_paramhdr phdr; | |
1085 | ||
d8238d9d XL |
1086 | retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + |
1087 | paylen + sizeof(phdr)); | |
1da177e4 LT |
1088 | if (!retval) |
1089 | goto end; | |
1090 | ||
3c918704 XL |
1091 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + |
1092 | sizeof(phdr)); | |
1da177e4 LT |
1093 | |
1094 | phdr.type = htons(chunk->chunk_hdr->type); | |
1095 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df | 1096 | sctp_addto_chunk(retval, paylen, payload); |
3c918704 | 1097 | sctp_addto_param(retval, sizeof(phdr), &phdr); |
1da177e4 LT |
1098 | |
1099 | end: | |
1100 | return retval; | |
1101 | } | |
1102 | ||
ba016670 | 1103 | struct sctp_chunk *sctp_make_violation_paramlen( |
327c0dab XL |
1104 | const struct sctp_association *asoc, |
1105 | const struct sctp_chunk *chunk, | |
1106 | struct sctp_paramhdr *param) | |
ba016670 | 1107 | { |
ba016670 | 1108 | static const char error[] = "The following parameter had invalid length:"; |
d8238d9d | 1109 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + |
3c918704 | 1110 | sizeof(*param); |
327c0dab | 1111 | struct sctp_chunk *retval; |
ba016670 WY |
1112 | |
1113 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1114 | if (!retval) | |
1115 | goto nodata; | |
1116 | ||
1117 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
3c918704 | 1118 | sizeof(error) + sizeof(*param)); |
ba016670 | 1119 | sctp_addto_chunk(retval, sizeof(error), error); |
3c918704 | 1120 | sctp_addto_param(retval, sizeof(*param), param); |
ba016670 WY |
1121 | |
1122 | nodata: | |
1123 | return retval; | |
1124 | } | |
1125 | ||
de4594a5 | 1126 | struct sctp_chunk *sctp_make_violation_max_retrans( |
327c0dab XL |
1127 | const struct sctp_association *asoc, |
1128 | const struct sctp_chunk *chunk) | |
de4594a5 | 1129 | { |
39a2d5cb | 1130 | static const char error[] = "Association exceeded its max_retrans count"; |
d8238d9d | 1131 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); |
327c0dab | 1132 | struct sctp_chunk *retval; |
de4594a5 NH |
1133 | |
1134 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1135 | if (!retval) | |
1136 | goto nodata; | |
1137 | ||
1138 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1139 | sctp_addto_chunk(retval, sizeof(error), error); | |
1140 | ||
1141 | nodata: | |
1142 | return retval; | |
1143 | } | |
1144 | ||
1da177e4 LT |
1145 | /* Make a HEARTBEAT chunk. */ |
1146 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
edf903f8 | 1147 | const struct sctp_transport *transport) |
1da177e4 | 1148 | { |
edf903f8 | 1149 | struct sctp_sender_hb_info hbinfo; |
92c73af5 | 1150 | struct sctp_chunk *retval; |
92c73af5 | 1151 | |
cea8768f MRL |
1152 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1153 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1154 | |
1155 | if (!retval) | |
1156 | goto nodata; | |
1157 | ||
92c73af5 | 1158 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
edf903f8 | 1159 | hbinfo.param_hdr.length = htons(sizeof(hbinfo)); |
92c73af5 WY |
1160 | hbinfo.daddr = transport->ipaddr; |
1161 | hbinfo.sent_at = jiffies; | |
1162 | hbinfo.hb_nonce = transport->hb_nonce; | |
1163 | ||
1da177e4 LT |
1164 | /* Cast away the 'const', as this is just telling the chunk |
1165 | * what transport it belongs to. | |
1166 | */ | |
1167 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1168 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1169 | &hbinfo); | |
1da177e4 LT |
1170 | |
1171 | nodata: | |
1172 | return retval; | |
1173 | } | |
1174 | ||
1175 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
327c0dab XL |
1176 | const struct sctp_chunk *chunk, |
1177 | const void *payload, | |
1178 | const size_t paylen) | |
1da177e4 LT |
1179 | { |
1180 | struct sctp_chunk *retval; | |
1181 | ||
cea8768f MRL |
1182 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1183 | GFP_ATOMIC); | |
1da177e4 LT |
1184 | if (!retval) |
1185 | goto nodata; | |
1186 | ||
1187 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1188 | ||
1189 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1190 | * | |
1191 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1192 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1193 | * address from which it * received the DATA or control chunk | |
1194 | * to which it is replying. | |
1195 | * | |
1196 | * [HBACK back to where the HEARTBEAT came from.] | |
1197 | */ | |
1198 | if (chunk) | |
1199 | retval->transport = chunk->transport; | |
1200 | ||
1201 | nodata: | |
1202 | return retval; | |
1203 | } | |
1204 | ||
1205 | /* Create an Operation Error chunk with the specified space reserved. | |
1206 | * This routine can be used for containing multiple causes in the chunk. | |
1207 | */ | |
1208 | static struct sctp_chunk *sctp_make_op_error_space( | |
327c0dab XL |
1209 | const struct sctp_association *asoc, |
1210 | const struct sctp_chunk *chunk, | |
1211 | size_t size) | |
1da177e4 LT |
1212 | { |
1213 | struct sctp_chunk *retval; | |
1214 | ||
072017b4 | 1215 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
d8238d9d XL |
1216 | sizeof(struct sctp_errhdr) + size, |
1217 | GFP_ATOMIC); | |
1da177e4 LT |
1218 | if (!retval) |
1219 | goto nodata; | |
1220 | ||
1221 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1222 | * | |
1223 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1224 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1225 | * address from which it received the DATA or control chunk | |
1226 | * to which it is replying. | |
1227 | * | |
1228 | */ | |
1229 | if (chunk) | |
1230 | retval->transport = chunk->transport; | |
1231 | ||
1232 | nodata: | |
1233 | return retval; | |
1234 | } | |
1235 | ||
8914f4ba MRL |
1236 | /* Create an Operation Error chunk of a fixed size, specifically, |
1237 | * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. | |
1238 | * This is a helper function to allocate an error chunk for for those | |
1239 | * invalid parameter codes in which we may not want to report all the | |
1240 | * errors, if the incoming chunk is large. If it can't fit in a single | |
1241 | * packet, we ignore it. | |
5fa782c2 | 1242 | */ |
8914f4ba | 1243 | static inline struct sctp_chunk *sctp_make_op_error_limited( |
327c0dab XL |
1244 | const struct sctp_association *asoc, |
1245 | const struct sctp_chunk *chunk) | |
5fa782c2 | 1246 | { |
8914f4ba MRL |
1247 | size_t size = SCTP_DEFAULT_MAXSEGMENT; |
1248 | struct sctp_sock *sp = NULL; | |
1249 | ||
1250 | if (asoc) { | |
1251 | size = min_t(size_t, size, asoc->pathmtu); | |
1252 | sp = sctp_sk(asoc->base.sk); | |
1253 | } | |
5fa782c2 | 1254 | |
8914f4ba | 1255 | size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); |
5fa782c2 NH |
1256 | |
1257 | return sctp_make_op_error_space(asoc, chunk, size); | |
1258 | } | |
1259 | ||
1da177e4 LT |
1260 | /* Create an Operation Error chunk. */ |
1261 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
327c0dab XL |
1262 | const struct sctp_chunk *chunk, |
1263 | __be16 cause_code, const void *payload, | |
1264 | size_t paylen, size_t reserve_tail) | |
1da177e4 LT |
1265 | { |
1266 | struct sctp_chunk *retval; | |
1267 | ||
6383cfb3 | 1268 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1269 | if (!retval) |
1270 | goto nodata; | |
1271 | ||
6383cfb3 | 1272 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1273 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1274 | if (reserve_tail) |
1275 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1276 | |
1277 | nodata: | |
1278 | return retval; | |
1279 | } | |
1280 | ||
1b1e0bc9 XL |
1281 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, |
1282 | __u16 key_id) | |
4cd57c80 | 1283 | { |
4cd57c80 | 1284 | struct sctp_authhdr auth_hdr; |
327c0dab XL |
1285 | struct sctp_hmac *hmac_desc; |
1286 | struct sctp_chunk *retval; | |
4cd57c80 VY |
1287 | |
1288 | /* Get the first hmac that the peer told us to use */ | |
1289 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1290 | if (unlikely(!hmac_desc)) | |
1291 | return NULL; | |
1292 | ||
072017b4 | 1293 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
96f7ef4d XL |
1294 | hmac_desc->hmac_len + sizeof(auth_hdr), |
1295 | GFP_ATOMIC); | |
4cd57c80 VY |
1296 | if (!retval) |
1297 | return NULL; | |
1298 | ||
1299 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1b1e0bc9 | 1300 | auth_hdr.shkey_id = htons(key_id); |
4cd57c80 | 1301 | |
96f7ef4d XL |
1302 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), |
1303 | &auth_hdr); | |
4cd57c80 | 1304 | |
594831a8 | 1305 | skb_put_zero(retval->skb, hmac_desc->hmac_len); |
4cd57c80 VY |
1306 | |
1307 | /* Adjust the chunk header to include the empty MAC */ | |
1308 | retval->chunk_hdr->length = | |
1309 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1310 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1311 | ||
1312 | return retval; | |
1313 | } | |
1314 | ||
1315 | ||
1da177e4 LT |
1316 | /******************************************************************** |
1317 | * 2nd Level Abstractions | |
1318 | ********************************************************************/ | |
1319 | ||
1320 | /* Turn an skb into a chunk. | |
1321 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1322 | * |
1323 | * sctpimpguide-05.txt Section 2.8.2 | |
1324 | * M1) Each time a new DATA chunk is transmitted | |
1325 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1326 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1327 | * and when to fast retransmit. | |
1328 | * | |
1da177e4 LT |
1329 | */ |
1330 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
327c0dab XL |
1331 | const struct sctp_association *asoc, |
1332 | struct sock *sk, gfp_t gfp) | |
1da177e4 LT |
1333 | { |
1334 | struct sctp_chunk *retval; | |
1335 | ||
cea8768f | 1336 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1337 | |
1338 | if (!retval) | |
1339 | goto nodata; | |
bb33381d DB |
1340 | if (!sk) |
1341 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1342 | |
79af02c2 | 1343 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1344 | retval->skb = skb; |
1345 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1346 | retval->singleton = 1; |
1da177e4 | 1347 | |
3dc0a548 | 1348 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1349 | |
1350 | /* Polish the bead hole. */ | |
1351 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1352 | INIT_LIST_HEAD(&retval->frag_list); | |
1353 | SCTP_DBG_OBJCNT_INC(chunk); | |
e7f02796 | 1354 | refcount_set(&retval->refcnt, 1); |
1da177e4 LT |
1355 | |
1356 | nodata: | |
1357 | return retval; | |
1358 | } | |
1359 | ||
1360 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1361 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1362 | union sctp_addr *dest) | |
1363 | { | |
f235fca3 | 1364 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1365 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1366 | } |
1367 | ||
1368 | /* Extract the source address from a chunk. */ | |
1369 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1370 | { | |
1371 | /* If we have a known transport, use that. */ | |
1372 | if (chunk->transport) { | |
6a1e5f33 | 1373 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1374 | } else { |
1375 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1376 | return &chunk->source; |
1da177e4 LT |
1377 | } |
1378 | } | |
1379 | ||
1380 | /* Create a new chunk, setting the type and flags headers from the | |
1381 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1382 | */ | |
072017b4 | 1383 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
327c0dab XL |
1384 | __u8 type, __u8 flags, int paylen, |
1385 | gfp_t gfp) | |
1da177e4 | 1386 | { |
922dbc5b | 1387 | struct sctp_chunkhdr *chunk_hdr; |
327c0dab | 1388 | struct sctp_chunk *retval; |
1da177e4 LT |
1389 | struct sk_buff *skb; |
1390 | struct sock *sk; | |
07f2c7ab AK |
1391 | int chunklen; |
1392 | ||
1393 | chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); | |
1394 | if (chunklen > SCTP_MAX_CHUNK_LEN) | |
1395 | goto nodata; | |
1da177e4 LT |
1396 | |
1397 | /* No need to allocate LL here, as this is only a chunk. */ | |
07f2c7ab | 1398 | skb = alloc_skb(chunklen, gfp); |
1da177e4 LT |
1399 | if (!skb) |
1400 | goto nodata; | |
1401 | ||
1402 | /* Make room for the chunk header. */ | |
922dbc5b | 1403 | chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); |
1da177e4 LT |
1404 | chunk_hdr->type = type; |
1405 | chunk_hdr->flags = flags; | |
922dbc5b | 1406 | chunk_hdr->length = htons(sizeof(*chunk_hdr)); |
1da177e4 LT |
1407 | |
1408 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1409 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1410 | if (!retval) { |
1411 | kfree_skb(skb); | |
1412 | goto nodata; | |
1413 | } | |
1414 | ||
1415 | retval->chunk_hdr = chunk_hdr; | |
922dbc5b | 1416 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); |
1da177e4 | 1417 | |
4cd57c80 VY |
1418 | /* Determine if the chunk needs to be authenticated */ |
1419 | if (sctp_auth_send_cid(type, asoc)) | |
1420 | retval->auth = 1; | |
1421 | ||
1da177e4 LT |
1422 | return retval; |
1423 | nodata: | |
1424 | return NULL; | |
1425 | } | |
1426 | ||
072017b4 | 1427 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1428 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1429 | { |
cea8768f | 1430 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1431 | } |
1432 | ||
ad05a7a0 XL |
1433 | struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, |
1434 | __u8 flags, int paylen, gfp_t gfp) | |
1435 | { | |
1436 | return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); | |
1437 | } | |
1438 | ||
072017b4 | 1439 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
1440 | __u8 type, __u8 flags, int paylen, |
1441 | gfp_t gfp) | |
072017b4 | 1442 | { |
cea8768f | 1443 | struct sctp_chunk *chunk; |
072017b4 | 1444 | |
cea8768f | 1445 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1446 | if (chunk) |
1447 | sctp_control_set_owner_w(chunk); | |
1448 | ||
1449 | return chunk; | |
1450 | } | |
1da177e4 LT |
1451 | |
1452 | /* Release the memory occupied by a chunk. */ | |
1453 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1454 | { | |
a08de64d VY |
1455 | BUG_ON(!list_empty(&chunk->list)); |
1456 | list_del_init(&chunk->transmitted_list); | |
1457 | ||
c485658b DB |
1458 | consume_skb(chunk->skb); |
1459 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1460 | |
1461 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1462 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1463 | } | |
1464 | ||
1465 | /* Possibly, free the chunk. */ | |
1466 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1467 | { | |
1da177e4 LT |
1468 | /* Release our reference on the message tracker. */ |
1469 | if (chunk->msg) | |
1470 | sctp_datamsg_put(chunk->msg); | |
1471 | ||
1472 | sctp_chunk_put(chunk); | |
1473 | } | |
1474 | ||
1475 | /* Grab a reference to the chunk. */ | |
1476 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1477 | { | |
e7f02796 | 1478 | refcount_inc(&ch->refcnt); |
1da177e4 LT |
1479 | } |
1480 | ||
1481 | /* Release a reference to the chunk. */ | |
1482 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1483 | { | |
e7f02796 | 1484 | if (refcount_dec_and_test(&ch->refcnt)) |
1da177e4 LT |
1485 | sctp_chunk_destroy(ch); |
1486 | } | |
1487 | ||
1488 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1489 | * enough. | |
1490 | */ | |
1491 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1492 | { | |
1da177e4 | 1493 | int chunklen = ntohs(chunk->chunk_hdr->length); |
e2f036a9 | 1494 | int padlen = SCTP_PAD4(chunklen) - chunklen; |
327c0dab | 1495 | void *target; |
1da177e4 | 1496 | |
b952f4df | 1497 | skb_put_zero(chunk->skb, padlen); |
59ae1d12 | 1498 | target = skb_put_data(chunk->skb, data, len); |
1da177e4 LT |
1499 | |
1500 | /* Adjust the chunk length field. */ | |
1501 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1502 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1503 | |
1504 | return target; | |
1505 | } | |
1506 | ||
1507 | /* Append bytes from user space to the end of a chunk. Will panic if | |
1508 | * chunk is not big enough. | |
1509 | * Returns a kernel err value. | |
1510 | */ | |
e0eb093e AV |
1511 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1512 | struct iov_iter *from) | |
1da177e4 | 1513 | { |
e0eb093e | 1514 | void *target; |
1da177e4 LT |
1515 | |
1516 | /* Make room in chunk for data. */ | |
1517 | target = skb_put(chunk->skb, len); | |
1518 | ||
1519 | /* Copy data (whole iovec) into chunk */ | |
3b6d4dbf | 1520 | if (!copy_from_iter_full(target, len, from)) |
e0eb093e | 1521 | return -EFAULT; |
1da177e4 LT |
1522 | |
1523 | /* Adjust the chunk length field. */ | |
1524 | chunk->chunk_hdr->length = | |
1525 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1526 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1527 | |
e0eb093e | 1528 | return 0; |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | /* Helper function to assign a TSN if needed. This assumes that both | |
1532 | * the data_hdr and association have already been assigned. | |
1533 | */ | |
1534 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1535 | { | |
ab3e5e7b | 1536 | struct sctp_stream *stream; |
327c0dab XL |
1537 | struct sctp_chunk *lchunk; |
1538 | struct sctp_datamsg *msg; | |
1539 | __u16 ssn, sid; | |
1da177e4 LT |
1540 | |
1541 | if (chunk->has_ssn) | |
1542 | return; | |
1543 | ||
ab3e5e7b VY |
1544 | /* All fragments will be on the same stream */ |
1545 | sid = ntohs(chunk->subh.data_hdr->stream); | |
cee360ab | 1546 | stream = &chunk->asoc->stream; |
1da177e4 | 1547 | |
ab3e5e7b VY |
1548 | /* Now assign the sequence number to the entire message. |
1549 | * All fragments must have the same stream sequence number. | |
1550 | */ | |
1551 | msg = chunk->msg; | |
1552 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1553 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1554 | ssn = 0; | |
1555 | } else { | |
1556 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
a8386317 | 1557 | ssn = sctp_ssn_next(stream, out, sid); |
ab3e5e7b | 1558 | else |
a8386317 | 1559 | ssn = sctp_ssn_peek(stream, out, sid); |
ab3e5e7b VY |
1560 | } |
1561 | ||
1562 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1563 | lchunk->has_ssn = 1; | |
1564 | } | |
1da177e4 LT |
1565 | } |
1566 | ||
1567 | /* Helper function to assign a TSN if needed. This assumes that both | |
1568 | * the data_hdr and association have already been assigned. | |
1569 | */ | |
1570 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1571 | { | |
1572 | if (!chunk->has_tsn) { | |
1573 | /* This is the last possible instant to | |
1574 | * assign a TSN. | |
1575 | */ | |
1576 | chunk->subh.data_hdr->tsn = | |
1577 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1578 | chunk->has_tsn = 1; | |
1579 | } | |
1580 | } | |
1581 | ||
1582 | /* Create a CLOSED association to use with an incoming packet. */ | |
1583 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
327c0dab XL |
1584 | struct sctp_chunk *chunk, |
1585 | gfp_t gfp) | |
1da177e4 LT |
1586 | { |
1587 | struct sctp_association *asoc; | |
1c662018 | 1588 | enum sctp_scope scope; |
1da177e4 | 1589 | struct sk_buff *skb; |
1da177e4 LT |
1590 | |
1591 | /* Create the bare association. */ | |
1592 | scope = sctp_scope(sctp_source(chunk)); | |
1593 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1594 | if (!asoc) | |
1595 | goto nodata; | |
1596 | asoc->temp = 1; | |
1597 | skb = chunk->skb; | |
1598 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1599 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1600 | ||
1da177e4 LT |
1601 | nodata: |
1602 | return asoc; | |
1da177e4 LT |
1603 | } |
1604 | ||
1605 | /* Build a cookie representing asoc. | |
1606 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1607 | */ | |
f48ef4c7 XL |
1608 | static struct sctp_cookie_param *sctp_pack_cookie( |
1609 | const struct sctp_endpoint *ep, | |
1610 | const struct sctp_association *asoc, | |
1611 | const struct sctp_chunk *init_chunk, | |
327c0dab XL |
1612 | int *cookie_len, const __u8 *raw_addrs, |
1613 | int addrs_len) | |
1da177e4 | 1614 | { |
1da177e4 | 1615 | struct sctp_signed_cookie *cookie; |
f48ef4c7 | 1616 | struct sctp_cookie_param *retval; |
1da177e4 | 1617 | int headersize, bodysize; |
1da177e4 | 1618 | |
9834a2bb VY |
1619 | /* Header size is static data prior to the actual cookie, including |
1620 | * any padding. | |
1621 | */ | |
3c918704 | 1622 | headersize = sizeof(struct sctp_paramhdr) + |
d808ad9a | 1623 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1624 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1625 | bodysize = sizeof(struct sctp_cookie) |
1626 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1627 | ||
1628 | /* Pad out the cookie to a multiple to make the signature | |
1629 | * functions simpler to write. | |
1630 | */ | |
1631 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1632 | bodysize += SCTP_COOKIE_MULTIPLE | |
1633 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1634 | *cookie_len = headersize + bodysize; | |
1635 | ||
1da177e4 LT |
1636 | /* Clear this memory since we are sending this data structure |
1637 | * out on the network. | |
1638 | */ | |
af997d8c ACM |
1639 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1640 | if (!retval) | |
1641 | goto nodata; | |
1642 | ||
1da177e4 LT |
1643 | cookie = (struct sctp_signed_cookie *) retval->body; |
1644 | ||
1645 | /* Set up the parameter header. */ | |
1646 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1647 | retval->p.length = htons(*cookie_len); | |
1648 | ||
1649 | /* Copy the cookie part of the association itself. */ | |
1650 | cookie->c = asoc->c; | |
1651 | /* Save the raw address list length in the cookie. */ | |
1652 | cookie->c.raw_addr_list_len = addrs_len; | |
1653 | ||
1654 | /* Remember PR-SCTP capability. */ | |
1655 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1656 | ||
0f3fffd8 ISJ |
1657 | /* Save adaptation indication in the cookie. */ |
1658 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1659 | |
1660 | /* Set an expiration time for the cookie. */ | |
52db882f | 1661 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1662 | ktime_get_real()); |
1da177e4 LT |
1663 | |
1664 | /* Copy the peer's init packet. */ | |
1665 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1666 | ntohs(init_chunk->chunk_hdr->length)); | |
1667 | ||
1668 | /* Copy the raw local address list of the association. */ | |
1669 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1670 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1671 | ||
d808ad9a | 1672 | if (sctp_sk(ep->base.sk)->hmac) { |
75b93c63 | 1673 | struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; |
5821c769 | 1674 | int err; |
1b489e11 | 1675 | |
1da177e4 | 1676 | /* Sign the message. */ |
75b93c63 | 1677 | err = crypto_shash_setkey(tfm, ep->secret_key, |
5821c769 | 1678 | sizeof(ep->secret_key)) ?: |
75b93c63 EB |
1679 | crypto_shash_tfm_digest(tfm, (u8 *)&cookie->c, bodysize, |
1680 | cookie->signature); | |
5821c769 | 1681 | if (err) |
1b489e11 | 1682 | goto free_cookie; |
1da177e4 LT |
1683 | } |
1684 | ||
1da177e4 | 1685 | return retval; |
1b489e11 HX |
1686 | |
1687 | free_cookie: | |
1688 | kfree(retval); | |
1689 | nodata: | |
1690 | *cookie_len = 0; | |
1691 | return NULL; | |
1da177e4 LT |
1692 | } |
1693 | ||
1694 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1695 | struct sctp_association *sctp_unpack_cookie( | |
327c0dab XL |
1696 | const struct sctp_endpoint *ep, |
1697 | const struct sctp_association *asoc, | |
1698 | struct sctp_chunk *chunk, gfp_t gfp, | |
1699 | int *error, struct sctp_chunk **errp) | |
1da177e4 LT |
1700 | { |
1701 | struct sctp_association *retval = NULL; | |
327c0dab | 1702 | int headersize, bodysize, fixed_size; |
1da177e4 | 1703 | struct sctp_signed_cookie *cookie; |
327c0dab | 1704 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 1705 | struct sctp_cookie *bear_cookie; |
313e7b4d | 1706 | __u8 *digest = ep->digest; |
1c662018 | 1707 | enum sctp_scope scope; |
327c0dab | 1708 | unsigned int len; |
52db882f | 1709 | ktime_t kt; |
1da177e4 | 1710 | |
9834a2bb VY |
1711 | /* Header size is static data prior to the actual cookie, including |
1712 | * any padding. | |
1713 | */ | |
922dbc5b | 1714 | headersize = sizeof(struct sctp_chunkhdr) + |
d808ad9a | 1715 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1716 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1717 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1718 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1719 | ||
1720 | /* Verify that the chunk looks like it even has a cookie. | |
1721 | * There must be enough room for our cookie and our peer's | |
1722 | * INIT chunk. | |
1723 | */ | |
1724 | len = ntohs(chunk->chunk_hdr->length); | |
1725 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1726 | goto malformed; | |
1727 | ||
1728 | /* Verify that the cookie has been padded out. */ | |
1729 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1730 | goto malformed; | |
1731 | ||
1732 | /* Process the cookie. */ | |
1733 | cookie = chunk->subh.cookie_hdr; | |
1734 | bear_cookie = &cookie->c; | |
1735 | ||
1736 | if (!sctp_sk(ep->base.sk)->hmac) | |
1737 | goto no_hmac; | |
1738 | ||
1739 | /* Check the signature. */ | |
5821c769 | 1740 | { |
75b93c63 | 1741 | struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac; |
5821c769 HX |
1742 | int err; |
1743 | ||
75b93c63 | 1744 | err = crypto_shash_setkey(tfm, ep->secret_key, |
5821c769 | 1745 | sizeof(ep->secret_key)) ?: |
75b93c63 EB |
1746 | crypto_shash_tfm_digest(tfm, (u8 *)bear_cookie, bodysize, |
1747 | digest); | |
5821c769 HX |
1748 | if (err) { |
1749 | *error = -SCTP_IERROR_NOMEM; | |
1750 | goto fail; | |
1751 | } | |
1b489e11 | 1752 | } |
1da177e4 LT |
1753 | |
1754 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
570617e7 DB |
1755 | *error = -SCTP_IERROR_BAD_SIG; |
1756 | goto fail; | |
1da177e4 LT |
1757 | } |
1758 | ||
1759 | no_hmac: | |
1760 | /* IG Section 2.35.2: | |
1761 | * 3) Compare the port numbers and the verification tag contained | |
1762 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1763 | * verification tag within the SCTP common header of the received | |
1764 | * packet. If these values do not match the packet MUST be silently | |
1765 | * discarded, | |
1766 | */ | |
1767 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1768 | *error = -SCTP_IERROR_BAD_TAG; | |
1769 | goto fail; | |
1770 | } | |
1771 | ||
9b1dfad0 | 1772 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1773 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1774 | *error = -SCTP_IERROR_BAD_PORTS; | |
1775 | goto fail; | |
1776 | } | |
1777 | ||
1778 | /* Check to see if the cookie is stale. If there is already | |
1779 | * an association, there is no need to check cookie's expiration | |
1780 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1781 | * If skb has been timestamped, then use the stamp, otherwise |
1782 | * use current time. This introduces a small possibility that | |
1783 | * that a cookie may be considered expired, but his would only slow | |
1784 | * down the new association establishment instead of every packet. | |
1da177e4 | 1785 | */ |
f236218b | 1786 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
52db882f | 1787 | kt = skb_get_ktime(skb); |
f236218b | 1788 | else |
cb5e173e | 1789 | kt = ktime_get_real(); |
f236218b | 1790 | |
67cb9366 | 1791 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
8914f4ba MRL |
1792 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
1793 | __be32 n = htonl(usecs); | |
1794 | ||
1da177e4 LT |
1795 | /* |
1796 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1797 | * | |
1798 | * Cause of error | |
1799 | * --------------- | |
1800 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1801 | * Cookie that has expired. | |
1802 | */ | |
8914f4ba MRL |
1803 | *errp = sctp_make_op_error(asoc, chunk, |
1804 | SCTP_ERROR_STALE_COOKIE, &n, | |
1805 | sizeof(n), 0); | |
1806 | if (*errp) | |
1da177e4 | 1807 | *error = -SCTP_IERROR_STALE_COOKIE; |
8914f4ba | 1808 | else |
1da177e4 LT |
1809 | *error = -SCTP_IERROR_NOMEM; |
1810 | ||
1811 | goto fail; | |
1812 | } | |
1813 | ||
1814 | /* Make a new base association. */ | |
1815 | scope = sctp_scope(sctp_source(chunk)); | |
1816 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1817 | if (!retval) { | |
1818 | *error = -SCTP_IERROR_NOMEM; | |
1819 | goto fail; | |
1820 | } | |
1821 | ||
1822 | /* Set up our peer's port number. */ | |
1823 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1824 | ||
1825 | /* Populate the association from the cookie. */ | |
1826 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1827 | ||
1828 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1829 | GFP_ATOMIC) < 0) { | |
1830 | *error = -SCTP_IERROR_NOMEM; | |
1831 | goto fail; | |
1832 | } | |
1833 | ||
1834 | /* Also, add the destination address. */ | |
1835 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1836 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1837 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1838 | GFP_ATOMIC); | |
1da177e4 LT |
1839 | } |
1840 | ||
1841 | retval->next_tsn = retval->c.initial_tsn; | |
1842 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1843 | retval->addip_serial = retval->c.initial_tsn; | |
cc16f00f | 1844 | retval->strreset_outseq = retval->c.initial_tsn; |
1da177e4 LT |
1845 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1846 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1847 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1848 | |
1849 | /* The INIT stuff will be done by the side effects. */ | |
1850 | return retval; | |
1851 | ||
1852 | fail: | |
1853 | if (retval) | |
1854 | sctp_association_free(retval); | |
1855 | ||
1856 | return NULL; | |
1857 | ||
1858 | malformed: | |
1859 | /* Yikes! The packet is either corrupt or deliberately | |
1860 | * malformed. | |
1861 | */ | |
1862 | *error = -SCTP_IERROR_MALFORMED; | |
1863 | goto fail; | |
1864 | } | |
1865 | ||
1866 | /******************************************************************** | |
1867 | * 3rd Level Abstractions | |
1868 | ********************************************************************/ | |
1869 | ||
1870 | struct __sctp_missing { | |
9f81bcd9 AV |
1871 | __be32 num_missing; |
1872 | __be16 type; | |
bc10502d | 1873 | } __packed; |
1da177e4 LT |
1874 | |
1875 | /* | |
1876 | * Report a missing mandatory parameter. | |
1877 | */ | |
1878 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
34b4e29b | 1879 | enum sctp_param paramtype, |
1da177e4 LT |
1880 | struct sctp_chunk *chunk, |
1881 | struct sctp_chunk **errp) | |
1882 | { | |
1883 | struct __sctp_missing report; | |
1884 | __u16 len; | |
1885 | ||
e2f036a9 | 1886 | len = SCTP_PAD4(sizeof(report)); |
1da177e4 LT |
1887 | |
1888 | /* Make an ERROR chunk, preparing enough room for | |
1889 | * returning multiple unknown parameters. | |
1890 | */ | |
1891 | if (!*errp) | |
1892 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1893 | ||
1894 | if (*errp) { | |
1895 | report.num_missing = htonl(1); | |
1896 | report.type = paramtype; | |
ebdfcad4 | 1897 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1898 | sizeof(report)); |
1899 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1900 | } |
1901 | ||
1902 | /* Stop processing this chunk. */ | |
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | /* Report an Invalid Mandatory Parameter. */ | |
1907 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1908 | struct sctp_chunk *chunk, | |
1909 | struct sctp_chunk **errp) | |
1910 | { | |
1911 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1912 | ||
1913 | if (!*errp) | |
1914 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1915 | ||
1916 | if (*errp) | |
00f1c2df | 1917 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1918 | |
1919 | /* Stop processing this chunk. */ | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1924 | struct sctp_paramhdr *param, | |
1925 | const struct sctp_chunk *chunk, | |
1926 | struct sctp_chunk **errp) | |
1927 | { | |
7ab90804 VY |
1928 | /* This is a fatal error. Any accumulated non-fatal errors are |
1929 | * not reported. | |
1930 | */ | |
1931 | if (*errp) | |
1932 | sctp_chunk_free(*errp); | |
1933 | ||
1da177e4 | 1934 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1935 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1936 | |
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | ||
1941 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1942 | * send back an indicator to the peer. | |
1943 | */ | |
1944 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1945 | union sctp_params param, | |
1946 | struct sctp_chunk *chunk, | |
1947 | struct sctp_chunk **errp) | |
1948 | { | |
1949 | __u16 len = ntohs(param.p->length); | |
1950 | ||
7ab90804 VY |
1951 | /* Processing of the HOST_NAME parameter will generate an |
1952 | * ABORT. If we've accumulated any non-fatal errors, they | |
1953 | * would be unrecognized parameters and we should not include | |
1954 | * them in the ABORT. | |
1955 | */ | |
1956 | if (*errp) | |
1957 | sctp_chunk_free(*errp); | |
1958 | ||
8914f4ba MRL |
1959 | *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, |
1960 | param.v, len, 0); | |
1da177e4 LT |
1961 | |
1962 | /* Stop processing this chunk. */ | |
1963 | return 0; | |
1964 | } | |
1965 | ||
4e27428f XL |
1966 | static int sctp_verify_ext_param(struct net *net, |
1967 | const struct sctp_endpoint *ep, | |
1968 | union sctp_params param) | |
d6701191 | 1969 | { |
3c918704 | 1970 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
d6701191 | 1971 | int have_asconf = 0; |
327c0dab | 1972 | int have_auth = 0; |
d6701191 VY |
1973 | int i; |
1974 | ||
1975 | for (i = 0; i < num_ext; i++) { | |
1976 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1977 | case SCTP_CID_AUTH: |
1978 | have_auth = 1; | |
1979 | break; | |
1980 | case SCTP_CID_ASCONF: | |
1981 | case SCTP_CID_ASCONF_ACK: | |
1982 | have_asconf = 1; | |
1983 | break; | |
d6701191 VY |
1984 | } |
1985 | } | |
1986 | ||
1987 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1988 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
1989 | * only if ADD-IP is turned on and we are not backward-compatible | |
1990 | * mode. | |
1991 | */ | |
e1fc3b14 | 1992 | if (net->sctp.addip_noauth) |
d6701191 VY |
1993 | return 1; |
1994 | ||
4e27428f | 1995 | if (ep->asconf_enable && !have_auth && have_asconf) |
d6701191 VY |
1996 | return 0; |
1997 | ||
1998 | return 1; | |
1999 | } | |
2000 | ||
131a47e3 | 2001 | static void sctp_process_ext_param(struct sctp_association *asoc, |
327c0dab | 2002 | union sctp_params param) |
131a47e3 | 2003 | { |
3c918704 | 2004 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
131a47e3 VY |
2005 | int i; |
2006 | ||
2007 | for (i = 0; i < num_ext; i++) { | |
2008 | switch (param.ext->chunks[i]) { | |
c28445c3 | 2009 | case SCTP_CID_RECONF: |
a96701fb | 2010 | if (asoc->ep->reconf_enable) |
c28445c3 XL |
2011 | asoc->peer.reconf_capable = 1; |
2012 | break; | |
f7010e61 | 2013 | case SCTP_CID_FWD_TSN: |
1c134753 | 2014 | if (asoc->ep->prsctp_enable) |
28aa4c26 | 2015 | asoc->peer.prsctp_capable = 1; |
f7010e61 | 2016 | break; |
2017 | case SCTP_CID_AUTH: | |
2018 | /* if the peer reports AUTH, assume that he | |
2019 | * supports AUTH. | |
2020 | */ | |
b14878cc | 2021 | if (asoc->ep->auth_enable) |
f7010e61 | 2022 | asoc->peer.auth_capable = 1; |
2023 | break; | |
2024 | case SCTP_CID_ASCONF: | |
2025 | case SCTP_CID_ASCONF_ACK: | |
4e27428f | 2026 | if (asoc->ep->asconf_enable) |
f7010e61 | 2027 | asoc->peer.asconf_capable = 1; |
2028 | break; | |
96b120b3 | 2029 | case SCTP_CID_I_DATA: |
e55f4b8b | 2030 | if (asoc->ep->intl_enable) |
da1f6d4d | 2031 | asoc->peer.intl_capable = 1; |
96b120b3 | 2032 | break; |
f7010e61 | 2033 | default: |
2034 | break; | |
131a47e3 VY |
2035 | } |
2036 | } | |
2037 | } | |
2038 | ||
1da177e4 LT |
2039 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2040 | * | |
2041 | * The Parameter Types are encoded such that the | |
2042 | * highest-order two bits specify the action that must be | |
2043 | * taken if the processing endpoint does not recognize the | |
2044 | * Parameter Type. | |
2045 | * | |
7ab90804 VY |
2046 | * 00 - Stop processing this parameter; do not process any further |
2047 | * parameters within this chunk | |
1da177e4 | 2048 | * |
7ab90804 VY |
2049 | * 01 - Stop processing this parameter, do not process any further |
2050 | * parameters within this chunk, and report the unrecognized | |
2051 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2052 | * |
2053 | * 10 - Skip this parameter and continue processing. | |
2054 | * | |
2055 | * 11 - Skip this parameter and continue processing but | |
2056 | * report the unrecognized parameter in an | |
7ab90804 | 2057 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2058 | * |
2059 | * Return value: | |
7ab90804 VY |
2060 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2061 | * SCTP_IERROR_ERROR - stop and report an error. | |
2062 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2063 | */ |
4785c7ae XL |
2064 | static enum sctp_ierror sctp_process_unk_param( |
2065 | const struct sctp_association *asoc, | |
2066 | union sctp_params param, | |
2067 | struct sctp_chunk *chunk, | |
2068 | struct sctp_chunk **errp) | |
1da177e4 | 2069 | { |
7ab90804 | 2070 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2071 | |
2072 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2073 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2074 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2075 | break; |
2076 | case SCTP_PARAM_ACTION_SKIP: | |
2077 | break; | |
7ab90804 VY |
2078 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2079 | retval = SCTP_IERROR_ERROR; | |
2080 | /* Fall through */ | |
1da177e4 LT |
2081 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2082 | /* Make an ERROR chunk, preparing enough room for | |
2083 | * returning multiple unknown parameters. | |
2084 | */ | |
8914f4ba MRL |
2085 | if (!*errp) { |
2086 | *errp = sctp_make_op_error_limited(asoc, chunk); | |
2087 | if (!*errp) { | |
2088 | /* If there is no memory for generating the | |
2089 | * ERROR report as specified, an ABORT will be | |
2090 | * triggered to the peer and the association | |
2091 | * won't be established. | |
2092 | */ | |
2093 | retval = SCTP_IERROR_NOMEM; | |
2094 | break; | |
2095 | } | |
1da177e4 | 2096 | } |
8914f4ba MRL |
2097 | |
2098 | if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
2099 | ntohs(param.p->length))) | |
2100 | sctp_addto_chunk(*errp, ntohs(param.p->length), | |
2101 | param.v); | |
1da177e4 LT |
2102 | break; |
2103 | default: | |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | return retval; | |
2108 | } | |
2109 | ||
7ab90804 | 2110 | /* Verify variable length parameters |
1da177e4 | 2111 | * Return values: |
7ab90804 VY |
2112 | * SCTP_IERROR_ABORT - trigger an ABORT |
2113 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2114 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2115 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2116 | */ |
4785c7ae XL |
2117 | static enum sctp_ierror sctp_verify_param(struct net *net, |
2118 | const struct sctp_endpoint *ep, | |
2119 | const struct sctp_association *asoc, | |
2120 | union sctp_params param, | |
2121 | enum sctp_cid cid, | |
2122 | struct sctp_chunk *chunk, | |
2123 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2124 | { |
72da7b38 | 2125 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2126 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2127 | __u16 n_elt, id = 0; |
2128 | int i; | |
1da177e4 LT |
2129 | |
2130 | /* FIXME - This routine is not looking at each parameter per the | |
2131 | * chunk type, i.e., unrecognized parameters should be further | |
2132 | * identified based on the chunk id. | |
2133 | */ | |
2134 | ||
2135 | switch (param.p->type) { | |
2136 | case SCTP_PARAM_IPV4_ADDRESS: | |
2137 | case SCTP_PARAM_IPV6_ADDRESS: | |
2138 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2139 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2140 | case SCTP_PARAM_STATE_COOKIE: | |
2141 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2142 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2143 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2144 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2145 | break; |
2146 | ||
131a47e3 | 2147 | case SCTP_PARAM_SUPPORTED_EXT: |
4e27428f | 2148 | if (!sctp_verify_ext_param(net, ep, param)) |
d6701191 | 2149 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2150 | break; |
2151 | ||
d6de3097 | 2152 | case SCTP_PARAM_SET_PRIMARY: |
4e27428f | 2153 | if (ep->asconf_enable) |
d6de3097 | 2154 | break; |
48f9bcf9 | 2155 | goto unhandled; |
d6de3097 | 2156 | |
1da177e4 LT |
2157 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2158 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2159 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2160 | retval = SCTP_IERROR_ABORT; | |
2161 | break; | |
131a47e3 | 2162 | |
1da177e4 | 2163 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2164 | if (ep->prsctp_enable) |
1da177e4 | 2165 | break; |
48f9bcf9 | 2166 | goto unhandled; |
730fc3d0 VY |
2167 | |
2168 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2169 | if (!ep->auth_enable) |
48f9bcf9 | 2170 | goto unhandled; |
730fc3d0 VY |
2171 | |
2172 | /* SCTP-AUTH: Secion 6.1 | |
2173 | * If the random number is not 32 byte long the association | |
2174 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2175 | * cause 'Protocol Violation'. | |
2176 | */ | |
8914f4ba MRL |
2177 | if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - |
2178 | sizeof(struct sctp_paramhdr)) { | |
7ab90804 | 2179 | sctp_process_inv_paramlength(asoc, param.p, |
8914f4ba | 2180 | chunk, err_chunk); |
7ab90804 VY |
2181 | retval = SCTP_IERROR_ABORT; |
2182 | } | |
730fc3d0 VY |
2183 | break; |
2184 | ||
2185 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2186 | if (!ep->auth_enable) |
48f9bcf9 | 2187 | goto unhandled; |
730fc3d0 VY |
2188 | |
2189 | /* SCTP-AUTH: Section 3.2 | |
2190 | * The CHUNKS parameter MUST be included once in the INIT or | |
2191 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2192 | * chunks. Its maximum length is 260 bytes. | |
2193 | */ | |
7ab90804 VY |
2194 | if (260 < ntohs(param.p->length)) { |
2195 | sctp_process_inv_paramlength(asoc, param.p, | |
2196 | chunk, err_chunk); | |
2197 | retval = SCTP_IERROR_ABORT; | |
2198 | } | |
730fc3d0 VY |
2199 | break; |
2200 | ||
2201 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2202 | if (!ep->auth_enable) |
48f9bcf9 | 2203 | goto unhandled; |
72da7b38 WY |
2204 | |
2205 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
3c918704 XL |
2206 | n_elt = (ntohs(param.p->length) - |
2207 | sizeof(struct sctp_paramhdr)) >> 1; | |
72da7b38 WY |
2208 | |
2209 | /* SCTP-AUTH: Section 6.1 | |
2210 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2211 | * included in the HMAC-ALGO parameter. | |
2212 | */ | |
2213 | for (i = 0; i < n_elt; i++) { | |
2214 | id = ntohs(hmacs->hmac_ids[i]); | |
2215 | ||
2216 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2217 | break; | |
2218 | } | |
2219 | ||
2220 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2221 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2222 | err_chunk); | |
2223 | retval = SCTP_IERROR_ABORT; | |
2224 | } | |
2225 | break; | |
48f9bcf9 | 2226 | unhandled: |
1da177e4 | 2227 | default: |
bb33381d DB |
2228 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2229 | __func__, ntohs(param.p->type), cid); | |
2230 | ||
7ab90804 | 2231 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2232 | break; |
2233 | } | |
2234 | return retval; | |
2235 | } | |
2236 | ||
2237 | /* Verify the INIT packet before we process it. */ | |
b14878cc | 2238 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
6d85e68f | 2239 | const struct sctp_association *asoc, enum sctp_cid cid, |
01a992be XL |
2240 | struct sctp_init_chunk *peer_init, |
2241 | struct sctp_chunk *chunk, struct sctp_chunk **errp) | |
1da177e4 LT |
2242 | { |
2243 | union sctp_params param; | |
7613f5fe | 2244 | bool has_cookie = false; |
7ab90804 | 2245 | int result; |
1da177e4 | 2246 | |
7613f5fe DB |
2247 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2248 | * also mandatory, but is not checked here since the valid range | |
2249 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2250 | */ | |
2251 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2252 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2253 | peer_init->init_hdr.init_tag == 0 || | |
2254 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2255 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2256 | |
1da177e4 | 2257 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2258 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2259 | has_cookie = true; | |
2260 | } | |
1da177e4 LT |
2261 | |
2262 | /* There is a possibility that a parameter length was bad and | |
2263 | * in that case we would have stoped walking the parameters. | |
2264 | * The current param.p would point at the bad one. | |
2265 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2266 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2267 | * error handling code build and send the packet. | |
2268 | */ | |
26ac8e5f | 2269 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2270 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2271 | |
2272 | /* The only missing mandatory param possible today is | |
2273 | * the state cookie for an INIT-ACK chunk. | |
2274 | */ | |
7ab90804 VY |
2275 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2276 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2277 | chunk, errp); | |
1da177e4 | 2278 | |
7ab90804 | 2279 | /* Verify all the variable length parameters */ |
1da177e4 | 2280 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2281 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2282 | chunk, errp); | |
7ab90804 | 2283 | switch (result) { |
f7010e61 | 2284 | case SCTP_IERROR_ABORT: |
2285 | case SCTP_IERROR_NOMEM: | |
2286 | return 0; | |
2287 | case SCTP_IERROR_ERROR: | |
2288 | return 1; | |
2289 | case SCTP_IERROR_NO_ERROR: | |
2290 | default: | |
2291 | break; | |
1da177e4 LT |
2292 | } |
2293 | ||
2294 | } /* for (loop through all parameters) */ | |
2295 | ||
2296 | return 1; | |
2297 | } | |
2298 | ||
2299 | /* Unpack the parameters in an INIT packet into an association. | |
2300 | * Returns 0 on failure, else success. | |
2301 | * FIXME: This is an association method. | |
2302 | */ | |
de6becdc | 2303 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2304 | const union sctp_addr *peer_addr, |
01a992be | 2305 | struct sctp_init_chunk *peer_init, gfp_t gfp) |
1da177e4 | 2306 | { |
1da177e4 LT |
2307 | struct sctp_transport *transport; |
2308 | struct list_head *pos, *temp; | |
327c0dab | 2309 | union sctp_params param; |
de6becdc | 2310 | union sctp_addr addr; |
327c0dab | 2311 | struct sctp_af *af; |
de6becdc | 2312 | int src_match = 0; |
1da177e4 LT |
2313 | |
2314 | /* We must include the address that the INIT packet came from. | |
2315 | * This is the only address that matters for an INIT packet. | |
2316 | * When processing a COOKIE ECHO, we retrieve the from address | |
2317 | * of the INIT from the cookie. | |
2318 | */ | |
2319 | ||
2320 | /* This implementation defaults to making the first transport | |
2321 | * added as the primary transport. The source address seems to | |
2322 | * be a a better choice than any of the embedded addresses. | |
2323 | */ | |
cb3f837b | 2324 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2325 | goto nomem; |
2326 | ||
2327 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2328 | src_match = 1; | |
1da177e4 LT |
2329 | |
2330 | /* Process the initialization parameters. */ | |
1da177e4 | 2331 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2332 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2333 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2334 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2335 | af->from_addr_param(&addr, param.addr, | |
2336 | chunk->sctp_hdr->source, 0); | |
2337 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2338 | src_match = 1; | |
2339 | } | |
1da177e4 LT |
2340 | |
2341 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2342 | goto clean_up; |
1da177e4 LT |
2343 | } |
2344 | ||
de6becdc WY |
2345 | /* source address of chunk may not match any valid address */ |
2346 | if (!src_match) | |
2347 | goto clean_up; | |
2348 | ||
730fc3d0 VY |
2349 | /* AUTH: After processing the parameters, make sure that we |
2350 | * have all the required info to potentially do authentications. | |
2351 | */ | |
2352 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2353 | !asoc->peer.peer_hmacs)) | |
2354 | asoc->peer.auth_capable = 0; | |
2355 | ||
d6701191 VY |
2356 | /* In a non-backward compatible mode, if the peer claims |
2357 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2358 | * that we MUST ABORT the association. Section 6. The section | |
2359 | * also give us an option to silently ignore the packet, which | |
2360 | * is what we'll do here. | |
6b2f9cb6 | 2361 | */ |
4e7696d9 XL |
2362 | if (!asoc->base.net->sctp.addip_noauth && |
2363 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { | |
6b2f9cb6 VY |
2364 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2365 | SCTP_PARAM_DEL_IP | | |
2366 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2367 | asoc->peer.asconf_capable = 0; |
d6701191 | 2368 | goto clean_up; |
6b2f9cb6 VY |
2369 | } |
2370 | ||
3f7a87d2 FF |
2371 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2372 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2373 | transport = list_entry(pos, struct sctp_transport, transports); | |
2374 | if (transport->state == SCTP_UNKNOWN) { | |
2375 | sctp_assoc_rm_peer(asoc, transport); | |
2376 | } | |
2377 | } | |
2378 | ||
1da177e4 LT |
2379 | /* The fixed INIT headers are always in network byte |
2380 | * order. | |
2381 | */ | |
2382 | asoc->peer.i.init_tag = | |
2383 | ntohl(peer_init->init_hdr.init_tag); | |
2384 | asoc->peer.i.a_rwnd = | |
2385 | ntohl(peer_init->init_hdr.a_rwnd); | |
2386 | asoc->peer.i.num_outbound_streams = | |
2387 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2388 | asoc->peer.i.num_inbound_streams = | |
2389 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2390 | asoc->peer.i.initial_tsn = | |
2391 | ntohl(peer_init->init_hdr.initial_tsn); | |
2392 | ||
cc16f00f XL |
2393 | asoc->strreset_inseq = asoc->peer.i.initial_tsn; |
2394 | ||
1da177e4 LT |
2395 | /* Apply the upper bounds for output streams based on peer's |
2396 | * number of inbound streams. | |
2397 | */ | |
2398 | if (asoc->c.sinit_num_ostreams > | |
2399 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2400 | asoc->c.sinit_num_ostreams = | |
2401 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2402 | } | |
2403 | ||
2404 | if (asoc->c.sinit_max_instreams > | |
2405 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2406 | asoc->c.sinit_max_instreams = | |
2407 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2408 | } | |
2409 | ||
2410 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2411 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2412 | ||
2413 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2414 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2415 | ||
1da177e4 LT |
2416 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily |
2417 | * high (for example, implementations MAY use the size of the receiver | |
2418 | * advertised window). | |
2419 | */ | |
9dbc15f0 RD |
2420 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2421 | transports) { | |
1da177e4 LT |
2422 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2423 | } | |
2424 | ||
2425 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2426 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2427 | asoc->peer.i.initial_tsn, gfp)) | |
2428 | goto clean_up; | |
1da177e4 LT |
2429 | |
2430 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2431 | * | |
2432 | * The stream sequence number in all the streams shall start | |
2433 | * from 0 when the association is established. Also, when the | |
2434 | * stream sequence number reaches the value 65535 the next | |
2435 | * stream sequence number shall be set to 0. | |
2436 | */ | |
2437 | ||
ff356414 XL |
2438 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
2439 | asoc->c.sinit_max_instreams, gfp)) | |
7e062977 | 2440 | goto clean_up; |
1da177e4 | 2441 | |
4135cce7 XL |
2442 | /* Update frag_point when stream_interleave may get changed. */ |
2443 | sctp_assoc_update_frag_point(asoc); | |
2444 | ||
7e062977 XL |
2445 | if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) |
2446 | goto clean_up; | |
1da177e4 LT |
2447 | |
2448 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2449 | * | |
2450 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2451 | * remote endpoint it should do the following: | |
2452 | * ... | |
2453 | * A2) A serial number should be assigned to the Chunk. The serial | |
2454 | * number should be a monotonically increasing number. All serial | |
2455 | * numbers are defined to be initialized at the start of the | |
2456 | * association to the same value as the Initial TSN. | |
2457 | */ | |
2458 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2459 | return 1; | |
2460 | ||
2461 | clean_up: | |
2462 | /* Release the transport structures. */ | |
2463 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2464 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2465 | if (transport->state != SCTP_ACTIVE) |
2466 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2467 | } |
3f7a87d2 | 2468 | |
1da177e4 LT |
2469 | nomem: |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | ||
2474 | /* Update asoc with the option described in param. | |
2475 | * | |
2476 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2477 | * | |
2478 | * asoc is the association to update. | |
2479 | * param is the variable length parameter to use for update. | |
2480 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2481 | * If the current packet is an INIT we want to minimize the amount of | |
2482 | * work we do. In particular, we should not build transport | |
2483 | * structures for the addresses. | |
2484 | */ | |
2485 | static int sctp_process_param(struct sctp_association *asoc, | |
2486 | union sctp_params param, | |
2487 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2488 | gfp_t gfp) |
1da177e4 | 2489 | { |
327c0dab | 2490 | struct sctp_endpoint *ep = asoc->ep; |
d6de3097 | 2491 | union sctp_addr_param *addr_param; |
4e7696d9 | 2492 | struct net *net = asoc->base.net; |
d6de3097 | 2493 | struct sctp_transport *t; |
327c0dab XL |
2494 | enum sctp_scope scope; |
2495 | union sctp_addr addr; | |
2496 | struct sctp_af *af; | |
2497 | int retval = 1, i; | |
2498 | u32 stale; | |
2499 | __u16 sat; | |
1da177e4 LT |
2500 | |
2501 | /* We maintain all INIT parameters in network byte order all the | |
2502 | * time. This allows us to not worry about whether the parameters | |
2503 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2504 | */ | |
2505 | switch (param.p->type) { | |
2506 | case SCTP_PARAM_IPV6_ADDRESS: | |
2507 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2508 | break; | |
7dab83de VY |
2509 | goto do_addr_param; |
2510 | ||
1da177e4 | 2511 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2512 | /* v4 addresses are not allowed on v6-only socket */ |
2513 | if (ipv6_only_sock(asoc->base.sk)) | |
2514 | break; | |
2515 | do_addr_param: | |
1da177e4 | 2516 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2517 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2518 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2519 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2520 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2521 | return 0; |
2522 | break; | |
2523 | ||
2524 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2525 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2526 | break; |
2527 | ||
2528 | stale = ntohl(param.life->lifespan_increment); | |
2529 | ||
2530 | /* Suggested Cookie Life span increment's unit is msec, | |
2531 | * (1/1000sec). | |
2532 | */ | |
52db882f | 2533 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2534 | break; |
2535 | ||
2536 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2537 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2538 | break; |
2539 | ||
2540 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2541 | /* Turn off the default values first so we'll know which | |
2542 | * ones are really set by the peer. | |
2543 | */ | |
2544 | asoc->peer.ipv4_address = 0; | |
2545 | asoc->peer.ipv6_address = 0; | |
2546 | ||
140ee960 GJ |
2547 | /* Assume that peer supports the address family |
2548 | * by which it sends a packet. | |
2549 | */ | |
2550 | if (peer_addr->sa.sa_family == AF_INET6) | |
2551 | asoc->peer.ipv6_address = 1; | |
2552 | else if (peer_addr->sa.sa_family == AF_INET) | |
2553 | asoc->peer.ipv4_address = 1; | |
2554 | ||
1da177e4 | 2555 | /* Cycle through address types; avoid divide by 0. */ |
3c918704 | 2556 | sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2557 | if (sat) |
2558 | sat /= sizeof(__u16); | |
2559 | ||
2560 | for (i = 0; i < sat; ++i) { | |
2561 | switch (param.sat->types[i]) { | |
2562 | case SCTP_PARAM_IPV4_ADDRESS: | |
2563 | asoc->peer.ipv4_address = 1; | |
2564 | break; | |
2565 | ||
2566 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2567 | if (PF_INET6 == asoc->base.sk->sk_family) |
2568 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2569 | break; |
2570 | ||
2571 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2572 | asoc->peer.hostname_address = 1; | |
2573 | break; | |
2574 | ||
2575 | default: /* Just ignore anything else. */ | |
2576 | break; | |
3ff50b79 | 2577 | } |
1da177e4 LT |
2578 | } |
2579 | break; | |
2580 | ||
2581 | case SCTP_PARAM_STATE_COOKIE: | |
2582 | asoc->peer.cookie_len = | |
3c918704 | 2583 | ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
86fda90a | 2584 | kfree(asoc->peer.cookie); |
0a8dd9f6 NH |
2585 | asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp); |
2586 | if (!asoc->peer.cookie) | |
2587 | retval = 0; | |
1da177e4 LT |
2588 | break; |
2589 | ||
2590 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2591 | /* Would be odd to receive, but it causes no problems. */ | |
2592 | break; | |
2593 | ||
2594 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2595 | /* Rejected during verify stage. */ | |
2596 | break; | |
2597 | ||
2598 | case SCTP_PARAM_ECN_CAPABLE: | |
1b0b8114 XL |
2599 | if (asoc->ep->ecn_enable) { |
2600 | asoc->peer.ecn_capable = 1; | |
2601 | break; | |
2602 | } | |
2603 | /* Fall Through */ | |
2604 | goto fall_through; | |
2605 | ||
1da177e4 | 2606 | |
0f3fffd8 | 2607 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2608 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2609 | break; |
2610 | ||
d6de3097 | 2611 | case SCTP_PARAM_SET_PRIMARY: |
4e27428f | 2612 | if (!ep->asconf_enable) |
0ef46e28 VY |
2613 | goto fall_through; |
2614 | ||
8b32f234 | 2615 | addr_param = param.v + sizeof(struct sctp_addip_param); |
d6de3097 | 2616 | |
cfbf654e | 2617 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2618 | if (af == NULL) |
2619 | break; | |
2620 | ||
d6de3097 VY |
2621 | af->from_addr_param(&addr, addr_param, |
2622 | htons(asoc->peer.port), 0); | |
2623 | ||
2624 | /* if the address is invalid, we can't process it. | |
2625 | * XXX: see spec for what to do. | |
2626 | */ | |
2627 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2628 | break; | |
2629 | ||
2630 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2631 | if (!t) | |
2632 | break; | |
2633 | ||
2634 | sctp_assoc_set_primary(asoc, t); | |
2635 | break; | |
2636 | ||
131a47e3 VY |
2637 | case SCTP_PARAM_SUPPORTED_EXT: |
2638 | sctp_process_ext_param(asoc, param); | |
2639 | break; | |
2640 | ||
1da177e4 | 2641 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
1c134753 | 2642 | if (asoc->ep->prsctp_enable) { |
1da177e4 LT |
2643 | asoc->peer.prsctp_capable = 1; |
2644 | break; | |
2645 | } | |
d808ad9a | 2646 | /* Fall Through */ |
730fc3d0 VY |
2647 | goto fall_through; |
2648 | ||
2649 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2650 | if (!ep->auth_enable) |
730fc3d0 VY |
2651 | goto fall_through; |
2652 | ||
2653 | /* Save peer's random parameter */ | |
86fda90a | 2654 | kfree(asoc->peer.peer_random); |
730fc3d0 VY |
2655 | asoc->peer.peer_random = kmemdup(param.p, |
2656 | ntohs(param.p->length), gfp); | |
2657 | if (!asoc->peer.peer_random) { | |
2658 | retval = 0; | |
2659 | break; | |
2660 | } | |
2661 | break; | |
2662 | ||
2663 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2664 | if (!ep->auth_enable) |
730fc3d0 VY |
2665 | goto fall_through; |
2666 | ||
2667 | /* Save peer's HMAC list */ | |
86fda90a | 2668 | kfree(asoc->peer.peer_hmacs); |
730fc3d0 VY |
2669 | asoc->peer.peer_hmacs = kmemdup(param.p, |
2670 | ntohs(param.p->length), gfp); | |
2671 | if (!asoc->peer.peer_hmacs) { | |
2672 | retval = 0; | |
2673 | break; | |
2674 | } | |
2675 | ||
2676 | /* Set the default HMAC the peer requested*/ | |
2677 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2678 | break; | |
2679 | ||
2680 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2681 | if (!ep->auth_enable) |
730fc3d0 VY |
2682 | goto fall_through; |
2683 | ||
86fda90a | 2684 | kfree(asoc->peer.peer_chunks); |
730fc3d0 VY |
2685 | asoc->peer.peer_chunks = kmemdup(param.p, |
2686 | ntohs(param.p->length), gfp); | |
2687 | if (!asoc->peer.peer_chunks) | |
2688 | retval = 0; | |
2689 | break; | |
2690 | fall_through: | |
1da177e4 LT |
2691 | default: |
2692 | /* Any unrecognized parameters should have been caught | |
2693 | * and handled by sctp_verify_param() which should be | |
2694 | * called prior to this routine. Simply log the error | |
2695 | * here. | |
2696 | */ | |
bb33381d DB |
2697 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2698 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2699 | break; |
3ff50b79 | 2700 | } |
1da177e4 LT |
2701 | |
2702 | return retval; | |
2703 | } | |
2704 | ||
2705 | /* Select a new verification tag. */ | |
2706 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2707 | { | |
2708 | /* I believe that this random number generator complies with RFC1750. | |
2709 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2710 | */ | |
2711 | __u32 x; | |
2712 | ||
2713 | do { | |
2714 | get_random_bytes(&x, sizeof(__u32)); | |
2715 | } while (x == 0); | |
2716 | ||
2717 | return x; | |
2718 | } | |
2719 | ||
2720 | /* Select an initial TSN to send during startup. */ | |
2721 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2722 | { | |
2723 | __u32 retval; | |
2724 | ||
2725 | get_random_bytes(&retval, sizeof(__u32)); | |
2726 | return retval; | |
2727 | } | |
2728 | ||
2729 | /* | |
2730 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2731 | * 0 1 2 3 | |
2732 | * 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 | |
2733 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2734 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2735 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2736 | * | Serial Number | | |
2737 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2738 | * | Address Parameter | | |
2739 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2740 | * | ASCONF Parameter #1 | | |
2741 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2742 | * \ \ | |
2743 | * / .... / | |
2744 | * \ \ | |
2745 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2746 | * | ASCONF Parameter #N | | |
2747 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2748 | * | |
d808ad9a | 2749 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2750 | */ |
2751 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2752 | union sctp_addr *addr, | |
2753 | int vparam_len) | |
2754 | { | |
65205cc4 | 2755 | struct sctp_addiphdr asconf; |
1da177e4 LT |
2756 | struct sctp_chunk *retval; |
2757 | int length = sizeof(asconf) + vparam_len; | |
2758 | union sctp_addr_param addrparam; | |
2759 | int addrlen; | |
2760 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2761 | ||
2762 | addrlen = af->to_addr_param(addr, &addrparam); | |
2763 | if (!addrlen) | |
2764 | return NULL; | |
2765 | length += addrlen; | |
2766 | ||
2767 | /* Create the chunk. */ | |
cea8768f MRL |
2768 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2769 | GFP_ATOMIC); | |
1da177e4 LT |
2770 | if (!retval) |
2771 | return NULL; | |
2772 | ||
2773 | asconf.serial = htonl(asoc->addip_serial++); | |
2774 | ||
2775 | retval->subh.addip_hdr = | |
2776 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2777 | retval->param_hdr.v = | |
2778 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2779 | ||
2780 | return retval; | |
2781 | } | |
2782 | ||
2783 | /* ADDIP | |
2784 | * 3.2.1 Add IP Address | |
2785 | * 0 1 2 3 | |
2786 | * 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 | |
2787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2788 | * | Type = 0xC001 | Length = Variable | | |
2789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2790 | * | ASCONF-Request Correlation ID | | |
2791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2792 | * | Address Parameter | | |
2793 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2794 | * | |
2795 | * 3.2.2 Delete IP Address | |
2796 | * 0 1 2 3 | |
2797 | * 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 | |
2798 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2799 | * | Type = 0xC002 | Length = Variable | | |
2800 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2801 | * | ASCONF-Request Correlation ID | | |
2802 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2803 | * | Address Parameter | | |
2804 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2805 | * | |
2806 | */ | |
2807 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
327c0dab XL |
2808 | union sctp_addr *laddr, |
2809 | struct sockaddr *addrs, | |
2810 | int addrcnt, __be16 flags) | |
1da177e4 | 2811 | { |
327c0dab | 2812 | union sctp_addr_param addr_param; |
8b32f234 | 2813 | struct sctp_addip_param param; |
327c0dab XL |
2814 | int paramlen = sizeof(param); |
2815 | struct sctp_chunk *retval; | |
2816 | int addr_param_len = 0; | |
2817 | union sctp_addr *addr; | |
2818 | int totallen = 0, i; | |
2819 | int del_pickup = 0; | |
2820 | struct sctp_af *af; | |
2821 | void *addr_buf; | |
1da177e4 LT |
2822 | |
2823 | /* Get total length of all the address parameters. */ | |
2824 | addr_buf = addrs; | |
2825 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2826 | addr = addr_buf; |
1da177e4 LT |
2827 | af = sctp_get_af_specific(addr->v4.sin_family); |
2828 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2829 | ||
2830 | totallen += paramlen; | |
2831 | totallen += addr_param_len; | |
2832 | ||
2833 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2834 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2835 | /* reuse the parameter length from the same scope one */ | |
2836 | totallen += paramlen; | |
2837 | totallen += addr_param_len; | |
2838 | del_pickup = 1; | |
bb33381d DB |
2839 | |
2840 | pr_debug("%s: picked same-scope del_pending addr, " | |
2841 | "totallen for all addresses is %d\n", | |
2842 | __func__, totallen); | |
8a07eb0a | 2843 | } |
1da177e4 LT |
2844 | } |
2845 | ||
2846 | /* Create an asconf chunk with the required length. */ | |
2847 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2848 | if (!retval) | |
2849 | return NULL; | |
2850 | ||
2851 | /* Add the address parameters to the asconf chunk. */ | |
2852 | addr_buf = addrs; | |
2853 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2854 | addr = addr_buf; |
1da177e4 LT |
2855 | af = sctp_get_af_specific(addr->v4.sin_family); |
2856 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2857 | param.param_hdr.type = flags; | |
2858 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2859 | param.crr_id = htonl(i); |
1da177e4 LT |
2860 | |
2861 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2862 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2863 | ||
2864 | addr_buf += af->sockaddr_len; | |
2865 | } | |
8a07eb0a MH |
2866 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2867 | addr = asoc->asconf_addr_del_pending; | |
2868 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2869 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2870 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2871 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2872 | param.crr_id = htonl(i); |
8a07eb0a MH |
2873 | |
2874 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2875 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2876 | } | |
1da177e4 LT |
2877 | return retval; |
2878 | } | |
2879 | ||
2880 | /* ADDIP | |
2881 | * 3.2.4 Set Primary IP Address | |
2882 | * 0 1 2 3 | |
2883 | * 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 | |
2884 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2885 | * | Type =0xC004 | Length = Variable | | |
2886 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2887 | * | ASCONF-Request Correlation ID | | |
2888 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2889 | * | Address Parameter | | |
2890 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2891 | * | |
d808ad9a | 2892 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2893 | */ |
2894 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2895 | union sctp_addr *addr) | |
2896 | { | |
327c0dab XL |
2897 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2898 | union sctp_addr_param addrparam; | |
8b32f234 | 2899 | struct sctp_addip_param param; |
327c0dab XL |
2900 | struct sctp_chunk *retval; |
2901 | int len = sizeof(param); | |
2902 | int addrlen; | |
1da177e4 LT |
2903 | |
2904 | addrlen = af->to_addr_param(addr, &addrparam); | |
2905 | if (!addrlen) | |
2906 | return NULL; | |
2907 | len += addrlen; | |
2908 | ||
2909 | /* Create the chunk and make asconf header. */ | |
2910 | retval = sctp_make_asconf(asoc, addr, len); | |
2911 | if (!retval) | |
2912 | return NULL; | |
2913 | ||
2914 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2915 | param.param_hdr.length = htons(len); | |
2916 | param.crr_id = 0; | |
2917 | ||
2918 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2919 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2920 | ||
2921 | return retval; | |
2922 | } | |
2923 | ||
2924 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2925 | * 0 1 2 3 | |
2926 | * 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 | |
2927 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2928 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2929 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2930 | * | Serial Number | | |
2931 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2932 | * | ASCONF Parameter Response#1 | | |
2933 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2934 | * \ \ | |
2935 | * / .... / | |
2936 | * \ \ | |
2937 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2938 | * | ASCONF Parameter Response#N | | |
2939 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2940 | * | |
d808ad9a | 2941 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2942 | */ |
2943 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2944 | __u32 serial, int vparam_len) | |
2945 | { | |
327c0dab XL |
2946 | struct sctp_addiphdr asconf; |
2947 | struct sctp_chunk *retval; | |
2948 | int length = sizeof(asconf) + vparam_len; | |
1da177e4 LT |
2949 | |
2950 | /* Create the chunk. */ | |
cea8768f MRL |
2951 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2952 | GFP_ATOMIC); | |
1da177e4 LT |
2953 | if (!retval) |
2954 | return NULL; | |
2955 | ||
2956 | asconf.serial = htonl(serial); | |
2957 | ||
2958 | retval->subh.addip_hdr = | |
2959 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2960 | ||
2961 | return retval; | |
2962 | } | |
2963 | ||
2964 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2965 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
8b32f234 XL |
2966 | __be16 err_code, |
2967 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 2968 | { |
8b32f234 | 2969 | struct sctp_addip_param ack_param; |
327c0dab XL |
2970 | struct sctp_errhdr err_param; |
2971 | int asconf_param_len = 0; | |
2972 | int err_param_len = 0; | |
2973 | __be16 response_type; | |
1da177e4 LT |
2974 | |
2975 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2976 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2977 | } else { | |
2978 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2979 | err_param_len = sizeof(err_param); | |
2980 | if (asconf_param) | |
2981 | asconf_param_len = | |
2982 | ntohs(asconf_param->param_hdr.length); | |
2983 | } | |
2984 | ||
d808ad9a | 2985 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2986 | ack_param.param_hdr.type = response_type; |
2987 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2988 | err_param_len + | |
2989 | asconf_param_len); | |
2990 | ack_param.crr_id = crr_id; | |
2991 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2992 | ||
2993 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2994 | return; | |
2995 | ||
2996 | /* Add Error Cause parameter. */ | |
2997 | err_param.cause = err_code; | |
2998 | err_param.length = htons(err_param_len + asconf_param_len); | |
2999 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
3000 | ||
3001 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3002 | if (asconf_param) | |
3003 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3004 | } | |
3005 | ||
3006 | /* Process a asconf parameter. */ | |
dbc16db1 | 3007 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
8b32f234 XL |
3008 | struct sctp_chunk *asconf, |
3009 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 3010 | { |
327c0dab | 3011 | union sctp_addr_param *addr_param; |
1da177e4 | 3012 | struct sctp_transport *peer; |
1da177e4 | 3013 | union sctp_addr addr; |
327c0dab | 3014 | struct sctp_af *af; |
5f242a13 | 3015 | |
8b32f234 | 3016 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
c1cc678a | 3017 | |
44e65c1e WY |
3018 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3019 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3020 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3021 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3022 | ||
6a435732 | 3023 | switch (addr_param->p.type) { |
c4492586 WY |
3024 | case SCTP_PARAM_IPV6_ADDRESS: |
3025 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3026 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3027 | break; |
3028 | case SCTP_PARAM_IPV4_ADDRESS: | |
3029 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3030 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3031 | break; |
3032 | default: | |
945e5abc | 3033 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3034 | } |
3035 | ||
6a435732 | 3036 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3037 | if (unlikely(!af)) |
945e5abc | 3038 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3039 | |
dd86d136 | 3040 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3041 | |
3042 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3043 | * or multicast address. | |
3044 | * (note: wildcard is permitted and requires special handling so | |
3045 | * make sure we check for that) | |
3046 | */ | |
3047 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3048 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3049 | |
1da177e4 LT |
3050 | switch (asconf_param->param_hdr.type) { |
3051 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3052 | /* Section 4.2.1: |
3053 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3054 | * address of the packet MUST be added. | |
3055 | */ | |
3056 | if (af->is_any(&addr)) | |
3057 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3058 | ||
2277c7cd RH |
3059 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3060 | SCTP_PARAM_ADD_IP, | |
3061 | (struct sockaddr *)&addr, | |
3062 | af->sockaddr_len)) | |
3063 | return SCTP_ERROR_REQ_REFUSED; | |
3064 | ||
1da177e4 | 3065 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3066 | * request and does not have the local resources to add this |
3067 | * new address to the association, it MUST return an Error | |
3068 | * Cause TLV set to the new error code 'Operation Refused | |
3069 | * Due to Resource Shortage'. | |
3070 | */ | |
1da177e4 | 3071 | |
dd86d136 | 3072 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3073 | if (!peer) |
3074 | return SCTP_ERROR_RSRC_LOW; | |
3075 | ||
3076 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3077 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3078 | asoc->new_transport = peer; |
1da177e4 LT |
3079 | break; |
3080 | case SCTP_PARAM_DEL_IP: | |
3081 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3082 | * last remaining IP address of a peer endpoint, the receiver |
3083 | * MUST send an Error Cause TLV with the error cause set to the | |
3084 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3085 | */ | |
42e30bf3 | 3086 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3087 | return SCTP_ERROR_DEL_LAST_IP; |
3088 | ||
3089 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3090 | * address which is also the source address of the IP packet | |
3091 | * which contained the ASCONF chunk, the receiver MUST reject | |
3092 | * this request. To reject the request the receiver MUST send | |
3093 | * an Error Cause TLV set to the new error code 'Request to | |
3094 | * Delete Source IP Address' | |
3095 | */ | |
b1364104 | 3096 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3097 | return SCTP_ERROR_DEL_SRC_IP; |
3098 | ||
42e30bf3 VY |
3099 | /* Section 4.2.2 |
3100 | * If the address 0.0.0.0 or ::0 is provided, all | |
3101 | * addresses of the peer except the source address of the | |
3102 | * packet MUST be deleted. | |
3103 | */ | |
3104 | if (af->is_any(&addr)) { | |
3105 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3106 | sctp_assoc_del_nonprimary_peers(asoc, | |
3107 | asconf->transport); | |
7c5a9461 | 3108 | return SCTP_ERROR_NO_ERROR; |
3109 | } | |
3110 | ||
3111 | /* If the address is not part of the association, the | |
3112 | * ASCONF-ACK with Error Cause Indication Parameter | |
3113 | * which including cause of Unresolvable Address should | |
3114 | * be sent. | |
3115 | */ | |
3116 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3117 | if (!peer) | |
3118 | return SCTP_ERROR_DNS_FAILED; | |
3119 | ||
3120 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3121 | break; |
3122 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3123 | /* ADDIP Section 4.2.4 |
3124 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3125 | * MAY mark the source address of the packet as its | |
3126 | * primary. | |
3127 | */ | |
3128 | if (af->is_any(&addr)) | |
3129 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3130 | ||
2277c7cd RH |
3131 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3132 | SCTP_PARAM_SET_PRIMARY, | |
3133 | (struct sockaddr *)&addr, | |
3134 | af->sockaddr_len)) | |
3135 | return SCTP_ERROR_REQ_REFUSED; | |
3136 | ||
dd86d136 | 3137 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3138 | if (!peer) |
945e5abc | 3139 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3140 | |
3141 | sctp_assoc_set_primary(asoc, peer); | |
3142 | break; | |
1da177e4 LT |
3143 | } |
3144 | ||
3145 | return SCTP_ERROR_NO_ERROR; | |
3146 | } | |
3147 | ||
9de7922b DB |
3148 | /* Verify the ASCONF packet before we process it. */ |
3149 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3150 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3151 | struct sctp_paramhdr **errp) | |
3152 | { | |
68d75469 | 3153 | struct sctp_addip_chunk *addip; |
9de7922b | 3154 | bool addr_param_seen = false; |
327c0dab | 3155 | union sctp_params param; |
6f4c618d | 3156 | |
68d75469 | 3157 | addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; |
9de7922b DB |
3158 | sctp_walk_params(param, addip, addip_hdr.params) { |
3159 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3160 | |
9de7922b | 3161 | *errp = param.p; |
6f4c618d | 3162 | switch (param.p->type) { |
9de7922b DB |
3163 | case SCTP_PARAM_ERR_CAUSE: |
3164 | break; | |
3165 | case SCTP_PARAM_IPV4_ADDRESS: | |
a38905e6 | 3166 | if (length != sizeof(struct sctp_ipv4addr_param)) |
9de7922b | 3167 | return false; |
ce7b4ccc | 3168 | /* ensure there is only one addr param and it's in the |
3169 | * beginning of addip_hdr params, or we reject it. | |
3170 | */ | |
3171 | if (param.v != addip->addip_hdr.params) | |
3172 | return false; | |
9de7922b DB |
3173 | addr_param_seen = true; |
3174 | break; | |
3175 | case SCTP_PARAM_IPV6_ADDRESS: | |
00987cc0 | 3176 | if (length != sizeof(struct sctp_ipv6addr_param)) |
9de7922b | 3177 | return false; |
ce7b4ccc | 3178 | if (param.v != addip->addip_hdr.params) |
3179 | return false; | |
9de7922b DB |
3180 | addr_param_seen = true; |
3181 | break; | |
6f4c618d WY |
3182 | case SCTP_PARAM_ADD_IP: |
3183 | case SCTP_PARAM_DEL_IP: | |
3184 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3185 | /* In ASCONF chunks, these need to be first. */ |
3186 | if (addr_param_needed && !addr_param_seen) | |
3187 | return false; | |
3188 | length = ntohs(param.addip->param_hdr.length); | |
8b32f234 | 3189 | if (length < sizeof(struct sctp_addip_param) + |
3c918704 | 3190 | sizeof(**errp)) |
9de7922b | 3191 | return false; |
6f4c618d WY |
3192 | break; |
3193 | case SCTP_PARAM_SUCCESS_REPORT: | |
3194 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
8b32f234 | 3195 | if (length != sizeof(struct sctp_addip_param)) |
9de7922b | 3196 | return false; |
6f4c618d WY |
3197 | break; |
3198 | default: | |
9de7922b DB |
3199 | /* This is unkown to us, reject! */ |
3200 | return false; | |
6f4c618d | 3201 | } |
6f4c618d WY |
3202 | } |
3203 | ||
9de7922b DB |
3204 | /* Remaining sanity checks. */ |
3205 | if (addr_param_needed && !addr_param_seen) | |
3206 | return false; | |
3207 | if (!addr_param_needed && addr_param_seen) | |
3208 | return false; | |
3209 | if (param.v != chunk->chunk_end) | |
3210 | return false; | |
6f4c618d | 3211 | |
9de7922b | 3212 | return true; |
6f4c618d WY |
3213 | } |
3214 | ||
d808ad9a | 3215 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3216 | * return an ASCONF_ACK chunk to be sent in response. |
3217 | */ | |
3218 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3219 | struct sctp_chunk *asconf) | |
3220 | { | |
327c0dab | 3221 | union sctp_addr_param *addr_param; |
68d75469 | 3222 | struct sctp_addip_chunk *addip; |
327c0dab | 3223 | struct sctp_chunk *asconf_ack; |
9de7922b | 3224 | bool all_param_pass = true; |
327c0dab XL |
3225 | struct sctp_addiphdr *hdr; |
3226 | int length = 0, chunk_len; | |
9de7922b | 3227 | union sctp_params param; |
327c0dab XL |
3228 | __be16 err_code; |
3229 | __u32 serial; | |
1da177e4 | 3230 | |
68d75469 | 3231 | addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; |
922dbc5b XL |
3232 | chunk_len = ntohs(asconf->chunk_hdr->length) - |
3233 | sizeof(struct sctp_chunkhdr); | |
65205cc4 | 3234 | hdr = (struct sctp_addiphdr *)asconf->skb->data; |
1da177e4 LT |
3235 | serial = ntohl(hdr->serial); |
3236 | ||
d808ad9a | 3237 | /* Skip the addiphdr and store a pointer to address parameter. */ |
65205cc4 | 3238 | length = sizeof(*hdr); |
1da177e4 LT |
3239 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3240 | chunk_len -= length; | |
3241 | ||
3242 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3243 | * asconf parameter. |
d808ad9a | 3244 | */ |
6a435732 | 3245 | length = ntohs(addr_param->p.length); |
1da177e4 LT |
3246 | chunk_len -= length; |
3247 | ||
d808ad9a | 3248 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3249 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3250 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3251 | * parameters. |
1da177e4 | 3252 | */ |
2cab86be | 3253 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3254 | if (!asconf_ack) |
3255 | goto done; | |
3256 | ||
3257 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3258 | sctp_walk_params(param, addip, addip_hdr.params) { |
3259 | /* Skip preceeding address parameters. */ | |
3260 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3261 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3262 | continue; | |
3263 | ||
1da177e4 | 3264 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3265 | param.addip); |
1da177e4 LT |
3266 | /* ADDIP 4.1 A7) |
3267 | * If an error response is received for a TLV parameter, | |
3268 | * all TLVs with no response before the failed TLV are | |
3269 | * considered successful if not reported. All TLVs after | |
3270 | * the failed response are considered unsuccessful unless | |
3271 | * a specific success indication is present for the parameter. | |
3272 | */ | |
9de7922b DB |
3273 | if (err_code != SCTP_ERROR_NO_ERROR) |
3274 | all_param_pass = false; | |
1da177e4 | 3275 | if (!all_param_pass) |
9de7922b DB |
3276 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3277 | err_code, param.addip); | |
1da177e4 LT |
3278 | |
3279 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3280 | * an IP address sends an 'Out of Resource' in its response, it | |
3281 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3282 | * in the ASCONF. |
1da177e4 | 3283 | */ |
9de7922b | 3284 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3285 | goto done; |
1da177e4 | 3286 | } |
1da177e4 LT |
3287 | done: |
3288 | asoc->peer.addip_serial++; | |
3289 | ||
3290 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3291 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3292 | */ |
3293 | if (asconf_ack) { | |
1da177e4 | 3294 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3295 | list_add_tail(&asconf_ack->transmitted_list, |
3296 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3297 | } |
3298 | ||
3299 | return asconf_ack; | |
3300 | } | |
3301 | ||
3302 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3303 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
8b32f234 | 3304 | struct sctp_addip_param *asconf_param) |
1da177e4 | 3305 | { |
1da177e4 LT |
3306 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
3307 | union sctp_addr_param *addr_param; | |
dc022a98 | 3308 | struct sctp_sockaddr_entry *saddr; |
327c0dab XL |
3309 | struct sctp_transport *transport; |
3310 | union sctp_addr addr; | |
3311 | struct sctp_af *af; | |
1da177e4 | 3312 | |
8b32f234 | 3313 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
1da177e4 LT |
3314 | |
3315 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3316 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3317 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3318 | |
3319 | switch (asconf_param->param_hdr.type) { | |
3320 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3321 | /* This is always done in BH context with a socket lock |
3322 | * held, so the list can not change. | |
3323 | */ | |
0ed90fb0 | 3324 | local_bh_disable(); |
559cf710 | 3325 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3326 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3327 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3328 | } |
0ed90fb0 | 3329 | local_bh_enable(); |
3cd9749c WY |
3330 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3331 | transports) { | |
c86a773c | 3332 | sctp_transport_dst_release(transport); |
3cd9749c | 3333 | } |
1da177e4 LT |
3334 | break; |
3335 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3336 | local_bh_disable(); |
425e0f68 | 3337 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3338 | if (asoc->asconf_addr_del_pending != NULL && |
3339 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3340 | kfree(asoc->asconf_addr_del_pending); | |
3341 | asoc->asconf_addr_del_pending = NULL; | |
3342 | } | |
0ed90fb0 | 3343 | local_bh_enable(); |
9dbc15f0 RD |
3344 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3345 | transports) { | |
c86a773c | 3346 | sctp_transport_dst_release(transport); |
1da177e4 LT |
3347 | } |
3348 | break; | |
3349 | default: | |
3350 | break; | |
3351 | } | |
1da177e4 LT |
3352 | } |
3353 | ||
3354 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3355 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3356 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3357 | * ADDIP 4.1 |
3358 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3359 | * response before the failed TLV are considered successful if not reported. | |
3360 | * All TLVs after the failed response are considered unsuccessful unless a | |
3361 | * specific success indication is present for the parameter. | |
3362 | */ | |
dbc16db1 | 3363 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
8b32f234 XL |
3364 | struct sctp_addip_param *asconf_param, |
3365 | int no_err) | |
1da177e4 | 3366 | { |
8b32f234 | 3367 | struct sctp_addip_param *asconf_ack_param; |
327c0dab XL |
3368 | struct sctp_errhdr *err_param; |
3369 | int asconf_ack_len; | |
3370 | __be16 err_code; | |
3371 | int length; | |
1da177e4 LT |
3372 | |
3373 | if (no_err) | |
3374 | err_code = SCTP_ERROR_NO_ERROR; | |
3375 | else | |
3376 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3377 | ||
f3830ccc | 3378 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
922dbc5b | 3379 | sizeof(struct sctp_chunkhdr); |
f3830ccc | 3380 | |
1da177e4 LT |
3381 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3382 | * the first asconf_ack parameter. | |
d808ad9a | 3383 | */ |
65205cc4 | 3384 | length = sizeof(struct sctp_addiphdr); |
8b32f234 XL |
3385 | asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + |
3386 | length); | |
1da177e4 LT |
3387 | asconf_ack_len -= length; |
3388 | ||
3389 | while (asconf_ack_len > 0) { | |
3390 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3391 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3392 | case SCTP_PARAM_SUCCESS_REPORT: |
3393 | return SCTP_ERROR_NO_ERROR; | |
3394 | case SCTP_PARAM_ERR_CAUSE: | |
8b32f234 | 3395 | length = sizeof(*asconf_ack_param); |
ea110733 | 3396 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3397 | asconf_ack_len -= length; |
3398 | if (asconf_ack_len > 0) | |
3399 | return err_param->cause; | |
3400 | else | |
3401 | return SCTP_ERROR_INV_PARAM; | |
3402 | break; | |
3403 | default: | |
3404 | return SCTP_ERROR_INV_PARAM; | |
3405 | } | |
3406 | } | |
3407 | ||
3408 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3409 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3410 | asconf_ack_len -= length; |
3411 | } | |
3412 | ||
3413 | return err_code; | |
3414 | } | |
3415 | ||
3416 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3417 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3418 | struct sctp_chunk *asconf_ack) | |
3419 | { | |
327c0dab XL |
3420 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
3421 | struct sctp_addip_param *asconf_param; | |
3422 | __be16 err_code = SCTP_ERROR_NO_ERROR; | |
3423 | union sctp_addr_param *addr_param; | |
3424 | int asconf_len = asconf->skb->len; | |
3425 | int all_param_pass = 0; | |
3426 | int length = 0; | |
3427 | int no_err = 1; | |
3428 | int retval = 0; | |
1da177e4 LT |
3429 | |
3430 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3431 | * a pointer to address parameter. | |
d808ad9a | 3432 | */ |
68d75469 | 3433 | length = sizeof(struct sctp_addip_chunk); |
1da177e4 LT |
3434 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3435 | asconf_len -= length; | |
3436 | ||
3437 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3438 | * pointer to the first asconf parameter. |
d808ad9a | 3439 | */ |
6a435732 | 3440 | length = ntohs(addr_param->p.length); |
ea110733 | 3441 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3442 | asconf_len -= length; |
3443 | ||
3444 | /* ADDIP 4.1 | |
3445 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3446 | * failures are indicated, then all request(s) are considered | |
3447 | * successful. | |
3448 | */ | |
65205cc4 | 3449 | if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) |
1da177e4 LT |
3450 | all_param_pass = 1; |
3451 | ||
3452 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3453 | while (asconf_len > 0) { | |
3454 | if (all_param_pass) | |
3455 | err_code = SCTP_ERROR_NO_ERROR; | |
3456 | else { | |
3457 | err_code = sctp_get_asconf_response(asconf_ack, | |
3458 | asconf_param, | |
3459 | no_err); | |
3460 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3461 | no_err = 0; | |
3462 | } | |
3463 | ||
3464 | switch (err_code) { | |
3465 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3466 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3467 | break; |
3468 | ||
3469 | case SCTP_ERROR_RSRC_LOW: | |
3470 | retval = 1; | |
3471 | break; | |
3472 | ||
a987f762 | 3473 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3474 | /* Disable sending this type of asconf parameter in |
3475 | * future. | |
d808ad9a | 3476 | */ |
1da177e4 LT |
3477 | asoc->peer.addip_disabled_mask |= |
3478 | asconf_param->param_hdr.type; | |
3479 | break; | |
3480 | ||
3481 | case SCTP_ERROR_REQ_REFUSED: | |
3482 | case SCTP_ERROR_DEL_LAST_IP: | |
3483 | case SCTP_ERROR_DEL_SRC_IP: | |
3484 | default: | |
3485 | break; | |
3486 | } | |
3487 | ||
3488 | /* Skip the processed asconf parameter and move to the next | |
3489 | * one. | |
d808ad9a | 3490 | */ |
1da177e4 | 3491 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3492 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3493 | asconf_len -= length; |
3494 | } | |
3495 | ||
ddc4bbee | 3496 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3497 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3498 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3499 | } | |
8a07eb0a | 3500 | |
1da177e4 | 3501 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3502 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3503 | sctp_chunk_free(asconf); |
3504 | asoc->addip_last_asconf = NULL; | |
3505 | ||
1da177e4 LT |
3506 | return retval; |
3507 | } | |
3508 | ||
d808ad9a | 3509 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3510 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3511 | __u32 new_cum_tsn, size_t nstreams, | |
3512 | struct sctp_fwdtsn_skip *skiplist) | |
3513 | { | |
3514 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3515 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3516 | struct sctp_fwdtsn_skip skip; |
3517 | size_t hint; | |
3518 | int i; | |
3519 | ||
3520 | hint = (nstreams + 1) * sizeof(__u32); | |
3521 | ||
cea8768f | 3522 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3523 | |
3524 | if (!retval) | |
3525 | return NULL; | |
3526 | ||
1da177e4 LT |
3527 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3528 | retval->subh.fwdtsn_hdr = | |
3529 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3530 | ||
3531 | for (i = 0; i < nstreams; i++) { | |
3532 | skip.stream = skiplist[i].stream; | |
3533 | skip.ssn = skiplist[i].ssn; | |
3534 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3535 | } | |
3536 | ||
3537 | return retval; | |
3538 | } | |
cc16f00f | 3539 | |
2d07a49a XL |
3540 | struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, |
3541 | __u32 new_cum_tsn, size_t nstreams, | |
3542 | struct sctp_ifwdtsn_skip *skiplist) | |
3543 | { | |
3544 | struct sctp_chunk *retval = NULL; | |
3545 | struct sctp_ifwdtsn_hdr ftsn_hdr; | |
3546 | size_t hint; | |
3547 | ||
3548 | hint = (nstreams + 1) * sizeof(__u32); | |
3549 | ||
3550 | retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, | |
3551 | GFP_ATOMIC); | |
3552 | if (!retval) | |
3553 | return NULL; | |
3554 | ||
3555 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); | |
3556 | retval->subh.ifwdtsn_hdr = | |
3557 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3558 | ||
3559 | sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); | |
3560 | ||
3561 | return retval; | |
3562 | } | |
3563 | ||
cc16f00f XL |
3564 | /* RE-CONFIG 3.1 (RE-CONFIG chunk) |
3565 | * 0 1 2 3 | |
3566 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3567 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3568 | * | Type = 130 | Chunk Flags | Chunk Length | | |
3569 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3570 | * \ \ | |
3571 | * / Re-configuration Parameter / | |
3572 | * \ \ | |
3573 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3574 | * \ \ | |
3575 | * / Re-configuration Parameter (optional) / | |
3576 | * \ \ | |
3577 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3578 | */ | |
327c0dab XL |
3579 | static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, |
3580 | int length) | |
cc16f00f XL |
3581 | { |
3582 | struct sctp_reconf_chunk *reconf; | |
3583 | struct sctp_chunk *retval; | |
3584 | ||
3585 | retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, | |
3586 | GFP_ATOMIC); | |
3587 | if (!retval) | |
3588 | return NULL; | |
3589 | ||
3590 | reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; | |
3591 | retval->param_hdr.v = reconf->params; | |
3592 | ||
3593 | return retval; | |
3594 | } | |
3595 | ||
3596 | /* RE-CONFIG 4.1 (STREAM OUT RESET) | |
3597 | * 0 1 2 3 | |
3598 | * 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 | |
3599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3600 | * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | | |
3601 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3602 | * | Re-configuration Request Sequence Number | | |
3603 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3604 | * | Re-configuration Response Sequence Number | | |
3605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3606 | * | Sender's Last Assigned TSN | | |
3607 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3608 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3609 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3610 | * / ...... / | |
3611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3612 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3614 | * | |
3615 | * RE-CONFIG 4.2 (STREAM IN RESET) | |
3616 | * 0 1 2 3 | |
3617 | * 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 | |
3618 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3619 | * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | | |
3620 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3621 | * | Re-configuration Request Sequence Number | | |
3622 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3623 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3624 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3625 | * / ...... / | |
3626 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3627 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3628 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3629 | */ | |
3630 | struct sctp_chunk *sctp_make_strreset_req( | |
327c0dab | 3631 | const struct sctp_association *asoc, |
1da4fc97 | 3632 | __u16 stream_num, __be16 *stream_list, |
327c0dab | 3633 | bool out, bool in) |
cc16f00f | 3634 | { |
423852f8 | 3635 | __u16 stream_len = stream_num * sizeof(__u16); |
cc16f00f | 3636 | struct sctp_strreset_outreq outreq; |
cc16f00f XL |
3637 | struct sctp_strreset_inreq inreq; |
3638 | struct sctp_chunk *retval; | |
16e1a919 | 3639 | __u16 outlen, inlen; |
cc16f00f XL |
3640 | |
3641 | outlen = (sizeof(outreq) + stream_len) * out; | |
3642 | inlen = (sizeof(inreq) + stream_len) * in; | |
3643 | ||
3644 | retval = sctp_make_reconf(asoc, outlen + inlen); | |
3645 | if (!retval) | |
3646 | return NULL; | |
3647 | ||
cc16f00f XL |
3648 | if (outlen) { |
3649 | outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; | |
3650 | outreq.param_hdr.length = htons(outlen); | |
3651 | outreq.request_seq = htonl(asoc->strreset_outseq); | |
3652 | outreq.response_seq = htonl(asoc->strreset_inseq - 1); | |
3653 | outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); | |
3654 | ||
3655 | sctp_addto_chunk(retval, sizeof(outreq), &outreq); | |
3656 | ||
3657 | if (stream_len) | |
3658 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3659 | } | |
3660 | ||
3661 | if (inlen) { | |
3662 | inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; | |
3663 | inreq.param_hdr.length = htons(inlen); | |
3664 | inreq.request_seq = htonl(asoc->strreset_outseq + out); | |
3665 | ||
3666 | sctp_addto_chunk(retval, sizeof(inreq), &inreq); | |
3667 | ||
3668 | if (stream_len) | |
3669 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3670 | } | |
3671 | ||
cc16f00f XL |
3672 | return retval; |
3673 | } | |
c56480a1 XL |
3674 | |
3675 | /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) | |
3676 | * 0 1 2 3 | |
3677 | * 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 | |
3678 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3679 | * | Parameter Type = 15 | Parameter Length = 8 | | |
3680 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3681 | * | Re-configuration Request Sequence Number | | |
3682 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3683 | */ | |
3684 | struct sctp_chunk *sctp_make_strreset_tsnreq( | |
327c0dab | 3685 | const struct sctp_association *asoc) |
c56480a1 XL |
3686 | { |
3687 | struct sctp_strreset_tsnreq tsnreq; | |
3688 | __u16 length = sizeof(tsnreq); | |
3689 | struct sctp_chunk *retval; | |
3690 | ||
3691 | retval = sctp_make_reconf(asoc, length); | |
3692 | if (!retval) | |
3693 | return NULL; | |
3694 | ||
3695 | tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; | |
3696 | tsnreq.param_hdr.length = htons(length); | |
3697 | tsnreq.request_seq = htonl(asoc->strreset_outseq); | |
3698 | ||
3699 | sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); | |
3700 | ||
3701 | return retval; | |
3702 | } | |
78098117 XL |
3703 | |
3704 | /* RE-CONFIG 4.5/4.6 (ADD STREAM) | |
3705 | * 0 1 2 3 | |
3706 | * 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 | |
3707 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3708 | * | Parameter Type = 17 | Parameter Length = 12 | | |
3709 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3710 | * | Re-configuration Request Sequence Number | | |
3711 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3712 | * | Number of new streams | Reserved | | |
3713 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3714 | */ | |
3715 | struct sctp_chunk *sctp_make_strreset_addstrm( | |
327c0dab XL |
3716 | const struct sctp_association *asoc, |
3717 | __u16 out, __u16 in) | |
78098117 XL |
3718 | { |
3719 | struct sctp_strreset_addstrm addstrm; | |
3720 | __u16 size = sizeof(addstrm); | |
3721 | struct sctp_chunk *retval; | |
3722 | ||
3723 | retval = sctp_make_reconf(asoc, (!!out + !!in) * size); | |
3724 | if (!retval) | |
3725 | return NULL; | |
3726 | ||
3727 | if (out) { | |
3728 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; | |
3729 | addstrm.param_hdr.length = htons(size); | |
3730 | addstrm.number_of_streams = htons(out); | |
3731 | addstrm.request_seq = htonl(asoc->strreset_outseq); | |
3732 | addstrm.reserved = 0; | |
3733 | ||
3734 | sctp_addto_chunk(retval, size, &addstrm); | |
3735 | } | |
3736 | ||
3737 | if (in) { | |
3738 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; | |
3739 | addstrm.param_hdr.length = htons(size); | |
3740 | addstrm.number_of_streams = htons(in); | |
3741 | addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); | |
3742 | addstrm.reserved = 0; | |
3743 | ||
3744 | sctp_addto_chunk(retval, size, &addstrm); | |
3745 | } | |
3746 | ||
3747 | return retval; | |
3748 | } | |
bd4b9f8b XL |
3749 | |
3750 | /* RE-CONFIG 4.4 (RESP) | |
3751 | * 0 1 2 3 | |
3752 | * 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 | |
3753 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3754 | * | Parameter Type = 16 | Parameter Length | | |
3755 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3756 | * | Re-configuration Response Sequence Number | | |
3757 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3758 | * | Result | | |
3759 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3760 | */ | |
327c0dab XL |
3761 | struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, |
3762 | __u32 result, __u32 sn) | |
bd4b9f8b XL |
3763 | { |
3764 | struct sctp_strreset_resp resp; | |
3765 | __u16 length = sizeof(resp); | |
3766 | struct sctp_chunk *retval; | |
3767 | ||
3768 | retval = sctp_make_reconf(asoc, length); | |
3769 | if (!retval) | |
3770 | return NULL; | |
3771 | ||
3772 | resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3773 | resp.param_hdr.length = htons(length); | |
3774 | resp.response_seq = htonl(sn); | |
3775 | resp.result = htonl(result); | |
3776 | ||
3777 | sctp_addto_chunk(retval, sizeof(resp), &resp); | |
3778 | ||
3779 | return retval; | |
3780 | } | |
3781 | ||
3782 | /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) | |
3783 | * 0 1 2 3 | |
3784 | * 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 | |
3785 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3786 | * | Parameter Type = 16 | Parameter Length | | |
3787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3788 | * | Re-configuration Response Sequence Number | | |
3789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3790 | * | Result | | |
3791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3792 | * | Sender's Next TSN (optional) | | |
3793 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3794 | * | Receiver's Next TSN (optional) | | |
3795 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3796 | */ | |
327c0dab XL |
3797 | struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, |
3798 | __u32 result, __u32 sn, | |
3799 | __u32 sender_tsn, | |
3800 | __u32 receiver_tsn) | |
bd4b9f8b XL |
3801 | { |
3802 | struct sctp_strreset_resptsn tsnresp; | |
3803 | __u16 length = sizeof(tsnresp); | |
3804 | struct sctp_chunk *retval; | |
3805 | ||
3806 | retval = sctp_make_reconf(asoc, length); | |
3807 | if (!retval) | |
3808 | return NULL; | |
3809 | ||
3810 | tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3811 | tsnresp.param_hdr.length = htons(length); | |
3812 | ||
3813 | tsnresp.response_seq = htonl(sn); | |
3814 | tsnresp.result = htonl(result); | |
3815 | tsnresp.senders_next_tsn = htonl(sender_tsn); | |
3816 | tsnresp.receivers_next_tsn = htonl(receiver_tsn); | |
3817 | ||
3818 | sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); | |
3819 | ||
3820 | return retval; | |
3821 | } | |
ea625043 XL |
3822 | |
3823 | bool sctp_verify_reconf(const struct sctp_association *asoc, | |
3824 | struct sctp_chunk *chunk, | |
3825 | struct sctp_paramhdr **errp) | |
3826 | { | |
3827 | struct sctp_reconf_chunk *hdr; | |
3828 | union sctp_params param; | |
1da4fc97 XL |
3829 | __be16 last = 0; |
3830 | __u16 cnt = 0; | |
ea625043 XL |
3831 | |
3832 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3833 | sctp_walk_params(param, hdr, params) { | |
3834 | __u16 length = ntohs(param.p->length); | |
3835 | ||
3836 | *errp = param.p; | |
3837 | if (cnt++ > 2) | |
3838 | return false; | |
3839 | switch (param.p->type) { | |
3840 | case SCTP_PARAM_RESET_OUT_REQUEST: | |
3841 | if (length < sizeof(struct sctp_strreset_outreq) || | |
3842 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3843 | last != SCTP_PARAM_RESET_IN_REQUEST)) | |
3844 | return false; | |
3845 | break; | |
3846 | case SCTP_PARAM_RESET_IN_REQUEST: | |
3847 | if (length < sizeof(struct sctp_strreset_inreq) || | |
3848 | (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3849 | return false; | |
3850 | break; | |
3851 | case SCTP_PARAM_RESET_RESPONSE: | |
3852 | if ((length != sizeof(struct sctp_strreset_resp) && | |
3853 | length != sizeof(struct sctp_strreset_resptsn)) || | |
3854 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3855 | last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3856 | return false; | |
3857 | break; | |
3858 | case SCTP_PARAM_RESET_TSN_REQUEST: | |
3859 | if (length != | |
3860 | sizeof(struct sctp_strreset_tsnreq) || last) | |
3861 | return false; | |
3862 | break; | |
3863 | case SCTP_PARAM_RESET_ADD_IN_STREAMS: | |
3864 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3865 | (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) | |
3866 | return false; | |
3867 | break; | |
3868 | case SCTP_PARAM_RESET_ADD_OUT_STREAMS: | |
3869 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3870 | (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) | |
3871 | return false; | |
3872 | break; | |
3873 | default: | |
3874 | return false; | |
3875 | } | |
3876 | ||
3877 | last = param.p->type; | |
3878 | } | |
3879 | ||
3880 | return true; | |
3881 | } |