Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement the state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * C. Robin <chris@hundredacre.ac.uk> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Xingang Guo <xingang.guo@intel.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Sridhar Samudrala <sri@us.ibm.com> | |
41 | * Daisy Chang <daisyc@us.ibm.com> | |
42 | * Ardelle Fan <ardelle.fan@intel.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
5821c769 | 48 | #include <crypto/hash.h> |
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/kernel.h> | |
51 | #include <linux/ip.h> | |
52 | #include <linux/ipv6.h> | |
53 | #include <linux/net.h> | |
54 | #include <linux/inet.h> | |
ebc3bbcf | 55 | #include <linux/scatterlist.h> |
5a0e3ad6 | 56 | #include <linux/slab.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | #include <linux/random.h> /* for get_random_bytes */ | |
61 | #include <net/sctp/sctp.h> | |
62 | #include <net/sctp/sm.h> | |
63 | ||
072017b4 | 64 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
65 | __u8 type, __u8 flags, int paylen, |
66 | gfp_t gfp); | |
072017b4 | 67 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 68 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 69 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
70 | __u8 type, __u8 flags, int paylen, |
71 | gfp_t gfp); | |
f48ef4c7 XL |
72 | static struct sctp_cookie_param *sctp_pack_cookie( |
73 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
74 | const struct sctp_association *asoc, |
75 | const struct sctp_chunk *init_chunk, | |
76 | int *cookie_len, | |
77 | const __u8 *raw_addrs, int addrs_len); | |
78 | static int sctp_process_param(struct sctp_association *asoc, | |
79 | union sctp_params param, | |
80 | const union sctp_addr *peer_addr, | |
dd0fc66f | 81 | gfp_t gfp); |
8ee4be37 VY |
82 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
83 | const void *data); | |
6daaf0de | 84 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, |
85 | const void *data); | |
1da177e4 | 86 | |
072017b4 VY |
87 | /* Control chunk destructor */ |
88 | static void sctp_control_release_owner(struct sk_buff *skb) | |
89 | { | |
90 | /*TODO: do memory release */ | |
91 | } | |
92 | ||
93 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
94 | { | |
95 | struct sctp_association *asoc = chunk->asoc; | |
96 | struct sk_buff *skb = chunk->skb; | |
97 | ||
98 | /* TODO: properly account for control chunks. | |
99 | * To do it right we'll need: | |
100 | * 1) endpoint if association isn't known. | |
101 | * 2) proper memory accounting. | |
102 | * | |
103 | * For now don't do anything for now. | |
104 | */ | |
105 | skb->sk = asoc ? asoc->base.sk : NULL; | |
106 | skb->destructor = sctp_control_release_owner; | |
107 | } | |
108 | ||
1da177e4 LT |
109 | /* What was the inbound interface for this chunk? */ |
110 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
111 | { | |
e7487c86 | 112 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 113 | |
e7487c86 | 114 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
115 | } |
116 | ||
117 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
118 | * | |
119 | * Note 2: The ECN capable field is reserved for future use of | |
120 | * Explicit Congestion Notification. | |
121 | */ | |
122 | static const struct sctp_paramhdr ecap_param = { | |
123 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 124 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
125 | }; |
126 | static const struct sctp_paramhdr prsctp_param = { | |
127 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 128 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
129 | }; |
130 | ||
5fa782c2 | 131 | /* A helper to initialize an op error inside a |
1da177e4 LT |
132 | * provided chunk, as most cause codes will be embedded inside an |
133 | * abort chunk. | |
134 | */ | |
327c0dab XL |
135 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
136 | size_t paylen) | |
1da177e4 | 137 | { |
d8238d9d | 138 | struct sctp_errhdr err; |
1da177e4 LT |
139 | __u16 len; |
140 | ||
d808ad9a | 141 | /* Cause code constants are now defined in network order. */ |
1da177e4 | 142 | err.cause = cause_code; |
d8238d9d | 143 | len = sizeof(err) + paylen; |
1da177e4 | 144 | err.length = htons(len); |
d8238d9d | 145 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); |
1da177e4 LT |
146 | } |
147 | ||
5fa782c2 NH |
148 | /* A helper to initialize an op error inside a |
149 | * provided chunk, as most cause codes will be embedded inside an | |
150 | * abort chunk. Differs from sctp_init_cause in that it won't oops | |
151 | * if there isn't enough space in the op error chunk | |
152 | */ | |
db28aafa | 153 | static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, |
327c0dab | 154 | size_t paylen) |
5fa782c2 | 155 | { |
d8238d9d | 156 | struct sctp_errhdr err; |
5fa782c2 NH |
157 | __u16 len; |
158 | ||
159 | /* Cause code constants are now defined in network order. */ | |
160 | err.cause = cause_code; | |
d8238d9d | 161 | len = sizeof(err) + paylen; |
5fa782c2 NH |
162 | err.length = htons(len); |
163 | ||
2e3219b5 | 164 | if (skb_tailroom(chunk->skb) < len) |
5fa782c2 | 165 | return -ENOSPC; |
d8238d9d XL |
166 | |
167 | chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err); | |
168 | ||
5fa782c2 NH |
169 | return 0; |
170 | } | |
1da177e4 LT |
171 | /* 3.3.2 Initiation (INIT) (1) |
172 | * | |
173 | * This chunk is used to initiate a SCTP association between two | |
174 | * endpoints. The format of the INIT chunk is shown below: | |
175 | * | |
176 | * 0 1 2 3 | |
177 | * 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 | |
178 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
179 | * | Type = 1 | Chunk Flags | Chunk Length | | |
180 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
181 | * | Initiate Tag | | |
182 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
183 | * | Advertised Receiver Window Credit (a_rwnd) | | |
184 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
185 | * | Number of Outbound Streams | Number of Inbound Streams | | |
186 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
187 | * | Initial TSN | | |
188 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
189 | * \ \ | |
190 | * / Optional/Variable-Length Parameters / | |
191 | * \ \ | |
192 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
193 | * | |
194 | * | |
195 | * The INIT chunk contains the following parameters. Unless otherwise | |
196 | * noted, each parameter MUST only be included once in the INIT chunk. | |
197 | * | |
198 | * Fixed Parameters Status | |
199 | * ---------------------------------------------- | |
200 | * Initiate Tag Mandatory | |
201 | * Advertised Receiver Window Credit Mandatory | |
202 | * Number of Outbound Streams Mandatory | |
203 | * Number of Inbound Streams Mandatory | |
204 | * Initial TSN Mandatory | |
205 | * | |
206 | * Variable Parameters Status Type Value | |
207 | * ------------------------------------------------------------- | |
208 | * IPv4 Address (Note 1) Optional 5 | |
209 | * IPv6 Address (Note 1) Optional 6 | |
210 | * Cookie Preservative Optional 9 | |
211 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
212 | * Host Name Address (Note 3) Optional 11 | |
213 | * Supported Address Types (Note 4) Optional 12 | |
214 | */ | |
215 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
327c0dab XL |
216 | const struct sctp_bind_addr *bp, |
217 | gfp_t gfp, int vparam_len) | |
1da177e4 | 218 | { |
e1fc3b14 | 219 | struct net *net = sock_net(asoc->base.sk); |
327c0dab XL |
220 | struct sctp_supported_ext_param ext_param; |
221 | struct sctp_adaptation_ind_param aiparam; | |
222 | struct sctp_paramhdr *auth_chunks = NULL; | |
223 | struct sctp_paramhdr *auth_hmacs = NULL; | |
224 | struct sctp_supported_addrs_param sat; | |
b14878cc | 225 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
226 | struct sctp_chunk *retval = NULL; |
227 | int num_types, addrs_len = 0; | |
327c0dab XL |
228 | struct sctp_inithdr init; |
229 | union sctp_params addrs; | |
1da177e4 | 230 | struct sctp_sock *sp; |
327c0dab XL |
231 | __u8 extensions[4]; |
232 | size_t chunksize; | |
3dbe8656 | 233 | __be16 types[2]; |
131a47e3 | 234 | int num_ext = 0; |
1da177e4 LT |
235 | |
236 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
237 | * | |
238 | * Note 1: The INIT chunks can contain multiple addresses that | |
239 | * can be IPv4 and/or IPv6 in any combination. | |
240 | */ | |
1da177e4 LT |
241 | |
242 | /* Convert the provided bind address list to raw format. */ | |
243 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
244 | ||
245 | init.init_tag = htonl(asoc->c.my_vtag); | |
246 | init.a_rwnd = htonl(asoc->rwnd); | |
247 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
248 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
249 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
250 | ||
251 | /* How many address types are needed? */ | |
252 | sp = sctp_sk(asoc->base.sk); | |
253 | num_types = sp->pf->supported_addrs(sp, types); | |
254 | ||
a8170c35 | 255 | chunksize = sizeof(init) + addrs_len; |
e2f036a9 | 256 | chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); |
1da177e4 | 257 | chunksize += sizeof(ecap_param); |
8ee4be37 | 258 | |
28aa4c26 | 259 | if (asoc->prsctp_enable) |
036b579b VY |
260 | chunksize += sizeof(prsctp_param); |
261 | ||
131a47e3 VY |
262 | /* ADDIP: Section 4.2.7: |
263 | * An implementation supporting this extension [ADDIP] MUST list | |
264 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
265 | * INIT-ACK parameters. | |
131a47e3 | 266 | */ |
e1fc3b14 | 267 | if (net->sctp.addip_enable) { |
131a47e3 VY |
268 | extensions[num_ext] = SCTP_CID_ASCONF; |
269 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
270 | num_ext += 2; | |
271 | } | |
272 | ||
c28445c3 XL |
273 | if (asoc->reconf_enable) { |
274 | extensions[num_ext] = SCTP_CID_RECONF; | |
275 | num_ext += 1; | |
276 | } | |
277 | ||
6fc791ee | 278 | if (sp->adaptation_ind) |
279 | chunksize += sizeof(aiparam); | |
280 | ||
1da177e4 LT |
281 | chunksize += vparam_len; |
282 | ||
730fc3d0 | 283 | /* Account for AUTH related parameters */ |
b14878cc | 284 | if (ep->auth_enable) { |
730fc3d0 VY |
285 | /* Add random parameter length*/ |
286 | chunksize += sizeof(asoc->c.auth_random); | |
287 | ||
288 | /* Add HMACS parameter length if any were defined */ | |
3c918704 | 289 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 290 | if (auth_hmacs->length) |
e2f036a9 | 291 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
292 | else |
293 | auth_hmacs = NULL; | |
294 | ||
295 | /* Add CHUNKS parameter length */ | |
3c918704 | 296 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 297 | if (auth_chunks->length) |
e2f036a9 | 298 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 | 299 | else |
9baffaa6 | 300 | auth_chunks = NULL; |
730fc3d0 VY |
301 | |
302 | extensions[num_ext] = SCTP_CID_AUTH; | |
303 | num_ext += 1; | |
304 | } | |
305 | ||
131a47e3 VY |
306 | /* If we have any extensions to report, account for that */ |
307 | if (num_ext) | |
15328d9f | 308 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
131a47e3 | 309 | |
1da177e4 LT |
310 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
311 | * | |
312 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
313 | * Name address parameter. Moreover, the sender of the INIT | |
314 | * MUST NOT combine any other address types with the Host Name | |
315 | * address in the INIT. The receiver of INIT MUST ignore any | |
316 | * other address types if the Host Name address parameter is | |
317 | * present in the received INIT chunk. | |
318 | * | |
319 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
320 | */ | |
321 | ||
cea8768f | 322 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); |
1da177e4 LT |
323 | if (!retval) |
324 | goto nodata; | |
325 | ||
326 | retval->subh.init_hdr = | |
327 | sctp_addto_chunk(retval, sizeof(init), &init); | |
328 | retval->param_hdr.v = | |
329 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
330 | ||
331 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
332 | * | |
333 | * Note 4: This parameter, when present, specifies all the | |
334 | * address types the sending endpoint can support. The absence | |
335 | * of this parameter indicates that the sending endpoint can | |
336 | * support any address type. | |
337 | */ | |
338 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
339 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
340 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
341 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
342 | ||
343 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 344 | |
7aa1b54b | 345 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
346 | * fist before addiding the parameters for the extensions themselves |
347 | */ | |
348 | if (num_ext) { | |
349 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
350 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
351 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 352 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
353 | } |
354 | ||
28aa4c26 | 355 | if (asoc->prsctp_enable) |
1da177e4 | 356 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 357 | |
6fc791ee | 358 | if (sp->adaptation_ind) { |
359 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
360 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
361 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
362 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
363 | } | |
131a47e3 | 364 | |
730fc3d0 | 365 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 366 | if (ep->auth_enable) { |
730fc3d0 VY |
367 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
368 | asoc->c.auth_random); | |
369 | if (auth_hmacs) | |
370 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
371 | auth_hmacs); | |
372 | if (auth_chunks) | |
373 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
374 | auth_chunks); | |
375 | } | |
1da177e4 | 376 | nodata: |
a51482bd | 377 | kfree(addrs.v); |
1da177e4 LT |
378 | return retval; |
379 | } | |
380 | ||
381 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
327c0dab XL |
382 | const struct sctp_chunk *chunk, |
383 | gfp_t gfp, int unkparam_len) | |
1da177e4 | 384 | { |
327c0dab XL |
385 | struct sctp_supported_ext_param ext_param; |
386 | struct sctp_adaptation_ind_param aiparam; | |
387 | struct sctp_paramhdr *auth_chunks = NULL; | |
388 | struct sctp_paramhdr *auth_random = NULL; | |
389 | struct sctp_paramhdr *auth_hmacs = NULL; | |
390 | struct sctp_chunk *retval = NULL; | |
391 | struct sctp_cookie_param *cookie; | |
4ae70c08 | 392 | struct sctp_inithdr initack; |
1da177e4 | 393 | union sctp_params addrs; |
6fc791ee | 394 | struct sctp_sock *sp; |
327c0dab | 395 | __u8 extensions[4]; |
1da177e4 | 396 | size_t chunksize; |
131a47e3 | 397 | int num_ext = 0; |
327c0dab XL |
398 | int cookie_len; |
399 | int addrs_len; | |
1da177e4 LT |
400 | |
401 | /* Note: there may be no addresses to embed. */ | |
402 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
403 | ||
404 | initack.init_tag = htonl(asoc->c.my_vtag); | |
405 | initack.a_rwnd = htonl(asoc->rwnd); | |
406 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
407 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
408 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
409 | ||
410 | /* FIXME: We really ought to build the cookie right | |
411 | * into the packet instead of allocating more fresh memory. | |
412 | */ | |
413 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
414 | addrs.v, addrs_len); | |
415 | if (!cookie) | |
416 | goto nomem_cookie; | |
417 | ||
418 | /* Calculate the total size of allocation, include the reserved | |
419 | * space for reporting unknown parameters if it is specified. | |
420 | */ | |
6fc791ee | 421 | sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
422 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
423 | ||
d808ad9a | 424 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
425 | if (asoc->peer.ecn_capable) |
426 | chunksize += sizeof(ecap_param); | |
427 | ||
5ffad5ac | 428 | if (asoc->peer.prsctp_capable) |
036b579b VY |
429 | chunksize += sizeof(prsctp_param); |
430 | ||
5ffad5ac | 431 | if (asoc->peer.asconf_capable) { |
131a47e3 VY |
432 | extensions[num_ext] = SCTP_CID_ASCONF; |
433 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
434 | num_ext += 2; | |
435 | } | |
436 | ||
c28445c3 XL |
437 | if (asoc->peer.reconf_capable) { |
438 | extensions[num_ext] = SCTP_CID_RECONF; | |
439 | num_ext += 1; | |
440 | } | |
441 | ||
6fc791ee | 442 | if (sp->adaptation_ind) |
443 | chunksize += sizeof(aiparam); | |
1da177e4 | 444 | |
730fc3d0 | 445 | if (asoc->peer.auth_capable) { |
3c918704 | 446 | auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; |
730fc3d0 VY |
447 | chunksize += ntohs(auth_random->length); |
448 | ||
3c918704 | 449 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 450 | if (auth_hmacs->length) |
e2f036a9 | 451 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
452 | else |
453 | auth_hmacs = NULL; | |
454 | ||
3c918704 | 455 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 456 | if (auth_chunks->length) |
e2f036a9 | 457 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 VY |
458 | else |
459 | auth_chunks = NULL; | |
460 | ||
461 | extensions[num_ext] = SCTP_CID_AUTH; | |
462 | num_ext += 1; | |
463 | } | |
464 | ||
8ee4be37 | 465 | if (num_ext) |
15328d9f | 466 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
8ee4be37 | 467 | |
1da177e4 | 468 | /* Now allocate and fill out the chunk. */ |
cea8768f | 469 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
470 | if (!retval) |
471 | goto nomem_chunk; | |
472 | ||
b99a4d53 DC |
473 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
474 | * | |
475 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
476 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
477 | * address from which it received the DATA or control chunk | |
478 | * to which it is replying. | |
479 | * | |
480 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 LT |
481 | */ |
482 | retval->transport = chunk->transport; | |
b99a4d53 | 483 | |
1da177e4 LT |
484 | retval->subh.init_hdr = |
485 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
486 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
487 | sctp_addto_chunk(retval, cookie_len, cookie); | |
488 | if (asoc->peer.ecn_capable) | |
489 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
490 | if (num_ext) { |
491 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
492 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
493 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 494 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 495 | } |
1da177e4 LT |
496 | if (asoc->peer.prsctp_capable) |
497 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
498 | ||
6fc791ee | 499 | if (sp->adaptation_ind) { |
500 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
501 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
502 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
503 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
504 | } | |
1da177e4 | 505 | |
730fc3d0 VY |
506 | if (asoc->peer.auth_capable) { |
507 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
508 | auth_random); | |
509 | if (auth_hmacs) | |
510 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
511 | auth_hmacs); | |
512 | if (auth_chunks) | |
513 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
514 | auth_chunks); | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* We need to remove the const qualifier at this point. */ |
518 | retval->asoc = (struct sctp_association *) asoc; | |
519 | ||
1da177e4 LT |
520 | nomem_chunk: |
521 | kfree(cookie); | |
522 | nomem_cookie: | |
a51482bd | 523 | kfree(addrs.v); |
1da177e4 LT |
524 | return retval; |
525 | } | |
526 | ||
527 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
528 | * | |
529 | * This chunk is used only during the initialization of an association. | |
530 | * It is sent by the initiator of an association to its peer to complete | |
531 | * the initialization process. This chunk MUST precede any DATA chunk | |
532 | * sent within the association, but MAY be bundled with one or more DATA | |
533 | * chunks in the same packet. | |
534 | * | |
535 | * 0 1 2 3 | |
536 | * 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 | |
537 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
538 | * | Type = 10 |Chunk Flags | Length | | |
539 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
540 | * / Cookie / | |
541 | * \ \ | |
542 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
543 | * | |
544 | * Chunk Flags: 8 bit | |
545 | * | |
546 | * Set to zero on transmit and ignored on receipt. | |
547 | * | |
548 | * Length: 16 bits (unsigned integer) | |
549 | * | |
550 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
551 | * the chunk header and the size of the Cookie. | |
552 | * | |
553 | * Cookie: variable size | |
554 | * | |
555 | * This field must contain the exact cookie received in the | |
556 | * State Cookie parameter from the previous INIT ACK. | |
557 | * | |
558 | * An implementation SHOULD make the cookie as small as possible | |
559 | * to insure interoperability. | |
560 | */ | |
561 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
327c0dab | 562 | const struct sctp_chunk *chunk) |
1da177e4 LT |
563 | { |
564 | struct sctp_chunk *retval; | |
1da177e4 | 565 | int cookie_len; |
327c0dab | 566 | void *cookie; |
1da177e4 LT |
567 | |
568 | cookie = asoc->peer.cookie; | |
569 | cookie_len = asoc->peer.cookie_len; | |
570 | ||
571 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
572 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
573 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
574 | if (!retval) |
575 | goto nodata; | |
576 | retval->subh.cookie_hdr = | |
577 | sctp_addto_chunk(retval, cookie_len, cookie); | |
578 | ||
579 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
580 | * | |
581 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
582 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
583 | * address from which it * received the DATA or control chunk | |
584 | * to which it is replying. | |
585 | * | |
586 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
587 | */ | |
588 | if (chunk) | |
589 | retval->transport = chunk->transport; | |
590 | ||
591 | nodata: | |
592 | return retval; | |
593 | } | |
594 | ||
595 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
596 | * | |
597 | * This chunk is used only during the initialization of an | |
598 | * association. It is used to acknowledge the receipt of a COOKIE | |
599 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
600 | * within the association, but MAY be bundled with one or more DATA | |
601 | * chunks or SACK chunk in the same SCTP packet. | |
602 | * | |
603 | * 0 1 2 3 | |
604 | * 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 | |
605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
606 | * | Type = 11 |Chunk Flags | Length = 4 | | |
607 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
608 | * | |
609 | * Chunk Flags: 8 bits | |
610 | * | |
611 | * Set to zero on transmit and ignored on receipt. | |
612 | */ | |
613 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
327c0dab | 614 | const struct sctp_chunk *chunk) |
1da177e4 LT |
615 | { |
616 | struct sctp_chunk *retval; | |
617 | ||
cea8768f | 618 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
619 | |
620 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
621 | * | |
622 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
623 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
624 | * address from which it * received the DATA or control chunk | |
625 | * to which it is replying. | |
626 | * | |
627 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
628 | */ | |
629 | if (retval && chunk) | |
630 | retval->transport = chunk->transport; | |
631 | ||
632 | return retval; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Appendix A: Explicit Congestion Notification: | |
637 | * CWR: | |
638 | * | |
639 | * RFC 2481 details a specific bit for a sender to send in the header of | |
640 | * its next outbound TCP segment to indicate to its peer that it has | |
641 | * reduced its congestion window. This is termed the CWR bit. For | |
642 | * SCTP the same indication is made by including the CWR chunk. | |
643 | * This chunk contains one data element, i.e. the TSN number that | |
644 | * was sent in the ECNE chunk. This element represents the lowest | |
645 | * TSN number in the datagram that was originally marked with the | |
646 | * CE bit. | |
647 | * | |
648 | * 0 1 2 3 | |
649 | * 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 | |
650 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
651 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
652 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
653 | * | Lowest TSN Number | | |
654 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
655 | * | |
656 | * Note: The CWR is considered a Control chunk. | |
657 | */ | |
658 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
327c0dab XL |
659 | const __u32 lowest_tsn, |
660 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
661 | { |
662 | struct sctp_chunk *retval; | |
65f77105 | 663 | struct sctp_cwrhdr cwr; |
1da177e4 LT |
664 | |
665 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 666 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
65f77105 | 667 | sizeof(cwr), GFP_ATOMIC); |
1da177e4 LT |
668 | |
669 | if (!retval) | |
670 | goto nodata; | |
671 | ||
672 | retval->subh.ecn_cwr_hdr = | |
673 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
674 | ||
675 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
676 | * | |
677 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
678 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
679 | * address from which it * received the DATA or control chunk | |
680 | * to which it is replying. | |
681 | * | |
682 | * [Report a reduced congestion window back to where the ECNE | |
683 | * came from.] | |
684 | */ | |
685 | if (chunk) | |
686 | retval->transport = chunk->transport; | |
687 | ||
688 | nodata: | |
689 | return retval; | |
690 | } | |
691 | ||
692 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
693 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
327c0dab | 694 | const __u32 lowest_tsn) |
1da177e4 LT |
695 | { |
696 | struct sctp_chunk *retval; | |
1fb6d83b | 697 | struct sctp_ecnehdr ecne; |
1da177e4 LT |
698 | |
699 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 700 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
1fb6d83b | 701 | sizeof(ecne), GFP_ATOMIC); |
1da177e4 LT |
702 | if (!retval) |
703 | goto nodata; | |
704 | retval->subh.ecne_hdr = | |
705 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
706 | ||
707 | nodata: | |
708 | return retval; | |
709 | } | |
710 | ||
711 | /* Make a DATA chunk for the given association from the provided | |
712 | * parameters. However, do not populate the data payload. | |
713 | */ | |
714 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, | |
327c0dab XL |
715 | const struct sctp_sndrcvinfo *sinfo, |
716 | int data_len, __u8 flags, __u16 ssn, | |
717 | gfp_t gfp) | |
1da177e4 LT |
718 | { |
719 | struct sctp_chunk *retval; | |
720 | struct sctp_datahdr dp; | |
721 | int chunk_len; | |
722 | ||
723 | /* We assign the TSN as LATE as possible, not here when | |
724 | * creating the chunk. | |
725 | */ | |
726 | dp.tsn = 0; | |
727 | dp.stream = htons(sinfo->sinfo_stream); | |
728 | dp.ppid = sinfo->sinfo_ppid; | |
729 | ||
730 | /* Set the flags for an unordered send. */ | |
eaa5c54d | 731 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
1da177e4 LT |
732 | flags |= SCTP_DATA_UNORDERED; |
733 | dp.ssn = 0; | |
734 | } else | |
735 | dp.ssn = htons(ssn); | |
736 | ||
737 | chunk_len = sizeof(dp) + data_len; | |
cea8768f | 738 | retval = sctp_make_data(asoc, flags, chunk_len, gfp); |
1da177e4 LT |
739 | if (!retval) |
740 | goto nodata; | |
741 | ||
742 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
743 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
744 | ||
745 | nodata: | |
746 | return retval; | |
747 | } | |
748 | ||
749 | /* Create a selective ackowledgement (SACK) for the given | |
750 | * association. This reports on which TSN's we've seen to date, | |
751 | * including duplicates and gaps. | |
752 | */ | |
753 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) | |
754 | { | |
1da177e4 | 755 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
327c0dab | 756 | struct sctp_association *aptr = (struct sctp_association *)asoc; |
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 MB |
830 | if (num_dup_tsns) { |
831 | aptr->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 | */ | |
843 | if (++aptr->peer.sack_generation == 0) { | |
844 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
845 | transports) | |
846 | trans->sack_generation = 0; | |
847 | aptr->peer.sack_generation = 1; | |
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 | ||
861 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
862 | shut.cum_tsn_ack = htonl(ctsn); | |
863 | ||
072017b4 | 864 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
e61e4055 | 865 | sizeof(shut), GFP_ATOMIC); |
1da177e4 LT |
866 | if (!retval) |
867 | goto nodata; | |
868 | ||
869 | retval->subh.shutdown_hdr = | |
870 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
871 | ||
872 | if (chunk) | |
873 | retval->transport = chunk->transport; | |
874 | nodata: | |
875 | return retval; | |
876 | } | |
877 | ||
878 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
327c0dab | 879 | const struct sctp_chunk *chunk) |
1da177e4 LT |
880 | { |
881 | struct sctp_chunk *retval; | |
882 | ||
cea8768f MRL |
883 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
884 | GFP_ATOMIC); | |
1da177e4 LT |
885 | |
886 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
887 | * | |
888 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
889 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
890 | * address from which it * received the DATA or control chunk | |
891 | * to which it is replying. | |
892 | * | |
893 | * [ACK back to where the SHUTDOWN came from.] | |
894 | */ | |
895 | if (retval && chunk) | |
896 | retval->transport = chunk->transport; | |
897 | ||
898 | return retval; | |
899 | } | |
900 | ||
901 | struct sctp_chunk *sctp_make_shutdown_complete( | |
327c0dab XL |
902 | const struct sctp_association *asoc, |
903 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
904 | { |
905 | struct sctp_chunk *retval; | |
906 | __u8 flags = 0; | |
907 | ||
047a2428 JF |
908 | /* Set the T-bit if we have no association (vtag will be |
909 | * reflected) | |
910 | */ | |
1da177e4 LT |
911 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
912 | ||
cea8768f MRL |
913 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
914 | 0, GFP_ATOMIC); | |
1da177e4 LT |
915 | |
916 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
917 | * | |
918 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
919 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
920 | * address from which it * received the DATA or control chunk | |
921 | * to which it is replying. | |
922 | * | |
923 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
924 | * came from.] | |
925 | */ | |
926 | if (retval && chunk) | |
927 | retval->transport = chunk->transport; | |
928 | ||
d808ad9a | 929 | return retval; |
1da177e4 LT |
930 | } |
931 | ||
932 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 933 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
934 | */ |
935 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
327c0dab XL |
936 | const struct sctp_chunk *chunk, |
937 | const size_t hint) | |
1da177e4 LT |
938 | { |
939 | struct sctp_chunk *retval; | |
940 | __u8 flags = 0; | |
941 | ||
047a2428 JF |
942 | /* Set the T-bit if we have no association and 'chunk' is not |
943 | * an INIT (vtag will be reflected). | |
944 | */ | |
945 | if (!asoc) { | |
946 | if (chunk && chunk->chunk_hdr && | |
947 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
948 | flags = 0; | |
949 | else | |
950 | flags = SCTP_CHUNK_FLAG_T; | |
951 | } | |
1da177e4 | 952 | |
cea8768f MRL |
953 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
954 | GFP_ATOMIC); | |
1da177e4 LT |
955 | |
956 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
957 | * | |
958 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
959 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
960 | * address from which it * received the DATA or control chunk | |
961 | * to which it is replying. | |
962 | * | |
963 | * [ABORT back to where the offender came from.] | |
964 | */ | |
965 | if (retval && chunk) | |
966 | retval->transport = chunk->transport; | |
967 | ||
968 | return retval; | |
969 | } | |
970 | ||
971 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
972 | struct sctp_chunk *sctp_make_abort_no_data( | |
327c0dab XL |
973 | const struct sctp_association *asoc, |
974 | const struct sctp_chunk *chunk, | |
975 | __u32 tsn) | |
1da177e4 LT |
976 | { |
977 | struct sctp_chunk *retval; | |
9f81bcd9 | 978 | __be32 payload; |
1da177e4 | 979 | |
d8238d9d XL |
980 | retval = sctp_make_abort(asoc, chunk, |
981 | sizeof(struct sctp_errhdr) + sizeof(tsn)); | |
1da177e4 LT |
982 | |
983 | if (!retval) | |
984 | goto no_mem; | |
985 | ||
986 | /* Put the tsn back into network byte order. */ | |
987 | payload = htonl(tsn); | |
00f1c2df WY |
988 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
989 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
990 | |
991 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
992 | * | |
993 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
994 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
995 | * address from which it * received the DATA or control chunk | |
996 | * to which it is replying. | |
997 | * | |
998 | * [ABORT back to where the offender came from.] | |
999 | */ | |
1000 | if (chunk) | |
1001 | retval->transport = chunk->transport; | |
1002 | ||
1003 | no_mem: | |
1004 | return retval; | |
1005 | } | |
1006 | ||
1007 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1008 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1009 | struct msghdr *msg, |
c164a9ba | 1010 | size_t paylen) |
1da177e4 LT |
1011 | { |
1012 | struct sctp_chunk *retval; | |
c164a9ba SS |
1013 | void *payload = NULL; |
1014 | int err; | |
1da177e4 | 1015 | |
d8238d9d XL |
1016 | retval = sctp_make_abort(asoc, NULL, |
1017 | sizeof(struct sctp_errhdr) + paylen); | |
1da177e4 LT |
1018 | if (!retval) |
1019 | goto err_chunk; | |
1020 | ||
1021 | if (paylen) { | |
1022 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1023 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1024 | if (!payload) |
1025 | goto err_payload; | |
c164a9ba | 1026 | |
6ce8e9ce | 1027 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1028 | if (err < 0) |
1029 | goto err_copy; | |
1da177e4 LT |
1030 | } |
1031 | ||
00f1c2df WY |
1032 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1033 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1034 | |
1035 | if (paylen) | |
1036 | kfree(payload); | |
1037 | ||
1038 | return retval; | |
1039 | ||
1040 | err_copy: | |
1041 | kfree(payload); | |
1042 | err_payload: | |
1043 | sctp_chunk_free(retval); | |
1044 | retval = NULL; | |
1045 | err_chunk: | |
1046 | return retval; | |
1047 | } | |
1048 | ||
5c94bf86 AB |
1049 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1050 | * enough. | |
1051 | */ | |
1052 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1053 | const void *data) | |
1054 | { | |
5c94bf86 | 1055 | int chunklen = ntohs(chunk->chunk_hdr->length); |
327c0dab | 1056 | void *target; |
5c94bf86 AB |
1057 | |
1058 | target = skb_put(chunk->skb, len); | |
1059 | ||
6383cfb3 VY |
1060 | if (data) |
1061 | memcpy(target, data, len); | |
1062 | else | |
1063 | memset(target, 0, len); | |
5c94bf86 AB |
1064 | |
1065 | /* Adjust the chunk length field. */ | |
1066 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1067 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1068 | ||
1069 | return target; | |
1070 | } | |
1071 | ||
d808ad9a | 1072 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 | 1073 | struct sctp_chunk *sctp_make_abort_violation( |
327c0dab XL |
1074 | const struct sctp_association *asoc, |
1075 | const struct sctp_chunk *chunk, | |
1076 | const __u8 *payload, | |
1077 | const size_t paylen) | |
1da177e4 LT |
1078 | { |
1079 | struct sctp_chunk *retval; | |
1080 | struct sctp_paramhdr phdr; | |
1081 | ||
d8238d9d XL |
1082 | retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + |
1083 | paylen + sizeof(phdr)); | |
1da177e4 LT |
1084 | if (!retval) |
1085 | goto end; | |
1086 | ||
3c918704 XL |
1087 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + |
1088 | sizeof(phdr)); | |
1da177e4 LT |
1089 | |
1090 | phdr.type = htons(chunk->chunk_hdr->type); | |
1091 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df | 1092 | sctp_addto_chunk(retval, paylen, payload); |
3c918704 | 1093 | sctp_addto_param(retval, sizeof(phdr), &phdr); |
1da177e4 LT |
1094 | |
1095 | end: | |
1096 | return retval; | |
1097 | } | |
1098 | ||
ba016670 | 1099 | struct sctp_chunk *sctp_make_violation_paramlen( |
327c0dab XL |
1100 | const struct sctp_association *asoc, |
1101 | const struct sctp_chunk *chunk, | |
1102 | struct sctp_paramhdr *param) | |
ba016670 | 1103 | { |
ba016670 | 1104 | static const char error[] = "The following parameter had invalid length:"; |
d8238d9d | 1105 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + |
3c918704 | 1106 | sizeof(*param); |
327c0dab | 1107 | struct sctp_chunk *retval; |
ba016670 WY |
1108 | |
1109 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1110 | if (!retval) | |
1111 | goto nodata; | |
1112 | ||
1113 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
3c918704 | 1114 | sizeof(error) + sizeof(*param)); |
ba016670 | 1115 | sctp_addto_chunk(retval, sizeof(error), error); |
3c918704 | 1116 | sctp_addto_param(retval, sizeof(*param), param); |
ba016670 WY |
1117 | |
1118 | nodata: | |
1119 | return retval; | |
1120 | } | |
1121 | ||
de4594a5 | 1122 | struct sctp_chunk *sctp_make_violation_max_retrans( |
327c0dab XL |
1123 | const struct sctp_association *asoc, |
1124 | const struct sctp_chunk *chunk) | |
de4594a5 | 1125 | { |
de4594a5 | 1126 | static const char error[] = "Association exceeded its max_retans count"; |
d8238d9d | 1127 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); |
327c0dab | 1128 | struct sctp_chunk *retval; |
de4594a5 NH |
1129 | |
1130 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1131 | if (!retval) | |
1132 | goto nodata; | |
1133 | ||
1134 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1135 | sctp_addto_chunk(retval, sizeof(error), error); | |
1136 | ||
1137 | nodata: | |
1138 | return retval; | |
1139 | } | |
1140 | ||
1da177e4 LT |
1141 | /* Make a HEARTBEAT chunk. */ |
1142 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
edf903f8 | 1143 | const struct sctp_transport *transport) |
1da177e4 | 1144 | { |
edf903f8 | 1145 | struct sctp_sender_hb_info hbinfo; |
92c73af5 | 1146 | struct sctp_chunk *retval; |
92c73af5 | 1147 | |
cea8768f MRL |
1148 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1149 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1150 | |
1151 | if (!retval) | |
1152 | goto nodata; | |
1153 | ||
92c73af5 | 1154 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
edf903f8 | 1155 | hbinfo.param_hdr.length = htons(sizeof(hbinfo)); |
92c73af5 WY |
1156 | hbinfo.daddr = transport->ipaddr; |
1157 | hbinfo.sent_at = jiffies; | |
1158 | hbinfo.hb_nonce = transport->hb_nonce; | |
1159 | ||
1da177e4 LT |
1160 | /* Cast away the 'const', as this is just telling the chunk |
1161 | * what transport it belongs to. | |
1162 | */ | |
1163 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1164 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1165 | &hbinfo); | |
1da177e4 LT |
1166 | |
1167 | nodata: | |
1168 | return retval; | |
1169 | } | |
1170 | ||
1171 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
327c0dab XL |
1172 | const struct sctp_chunk *chunk, |
1173 | const void *payload, | |
1174 | const size_t paylen) | |
1da177e4 LT |
1175 | { |
1176 | struct sctp_chunk *retval; | |
1177 | ||
cea8768f MRL |
1178 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1179 | GFP_ATOMIC); | |
1da177e4 LT |
1180 | if (!retval) |
1181 | goto nodata; | |
1182 | ||
1183 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1184 | ||
1185 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1186 | * | |
1187 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1188 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1189 | * address from which it * received the DATA or control chunk | |
1190 | * to which it is replying. | |
1191 | * | |
1192 | * [HBACK back to where the HEARTBEAT came from.] | |
1193 | */ | |
1194 | if (chunk) | |
1195 | retval->transport = chunk->transport; | |
1196 | ||
1197 | nodata: | |
1198 | return retval; | |
1199 | } | |
1200 | ||
1201 | /* Create an Operation Error chunk with the specified space reserved. | |
1202 | * This routine can be used for containing multiple causes in the chunk. | |
1203 | */ | |
1204 | static struct sctp_chunk *sctp_make_op_error_space( | |
327c0dab XL |
1205 | const struct sctp_association *asoc, |
1206 | const struct sctp_chunk *chunk, | |
1207 | size_t size) | |
1da177e4 LT |
1208 | { |
1209 | struct sctp_chunk *retval; | |
1210 | ||
072017b4 | 1211 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
d8238d9d XL |
1212 | sizeof(struct sctp_errhdr) + size, |
1213 | GFP_ATOMIC); | |
1da177e4 LT |
1214 | if (!retval) |
1215 | goto nodata; | |
1216 | ||
1217 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1218 | * | |
1219 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1220 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1221 | * address from which it received the DATA or control chunk | |
1222 | * to which it is replying. | |
1223 | * | |
1224 | */ | |
1225 | if (chunk) | |
1226 | retval->transport = chunk->transport; | |
1227 | ||
1228 | nodata: | |
1229 | return retval; | |
1230 | } | |
1231 | ||
5fa782c2 NH |
1232 | /* Create an Operation Error chunk of a fixed size, |
1233 | * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) | |
1234 | * This is a helper function to allocate an error chunk for | |
1235 | * for those invalid parameter codes in which we may not want | |
d82603c6 | 1236 | * to report all the errors, if the incoming chunk is large |
5fa782c2 NH |
1237 | */ |
1238 | static inline struct sctp_chunk *sctp_make_op_error_fixed( | |
327c0dab XL |
1239 | const struct sctp_association *asoc, |
1240 | const struct sctp_chunk *chunk) | |
5fa782c2 NH |
1241 | { |
1242 | size_t size = asoc ? asoc->pathmtu : 0; | |
1243 | ||
1244 | if (!size) | |
1245 | size = SCTP_DEFAULT_MAXSEGMENT; | |
1246 | ||
1247 | return sctp_make_op_error_space(asoc, chunk, size); | |
1248 | } | |
1249 | ||
1da177e4 LT |
1250 | /* Create an Operation Error chunk. */ |
1251 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
327c0dab XL |
1252 | const struct sctp_chunk *chunk, |
1253 | __be16 cause_code, const void *payload, | |
1254 | size_t paylen, size_t reserve_tail) | |
1da177e4 LT |
1255 | { |
1256 | struct sctp_chunk *retval; | |
1257 | ||
6383cfb3 | 1258 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1259 | if (!retval) |
1260 | goto nodata; | |
1261 | ||
6383cfb3 | 1262 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1263 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1264 | if (reserve_tail) |
1265 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1266 | |
1267 | nodata: | |
1268 | return retval; | |
1269 | } | |
1270 | ||
4cd57c80 VY |
1271 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) |
1272 | { | |
4cd57c80 | 1273 | struct sctp_authhdr auth_hdr; |
327c0dab XL |
1274 | struct sctp_hmac *hmac_desc; |
1275 | struct sctp_chunk *retval; | |
4cd57c80 VY |
1276 | __u8 *hmac; |
1277 | ||
1278 | /* Get the first hmac that the peer told us to use */ | |
1279 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1280 | if (unlikely(!hmac_desc)) | |
1281 | return NULL; | |
1282 | ||
072017b4 | 1283 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
96f7ef4d XL |
1284 | hmac_desc->hmac_len + sizeof(auth_hdr), |
1285 | GFP_ATOMIC); | |
4cd57c80 VY |
1286 | if (!retval) |
1287 | return NULL; | |
1288 | ||
1289 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1290 | auth_hdr.shkey_id = htons(asoc->active_key_id); | |
1291 | ||
96f7ef4d XL |
1292 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), |
1293 | &auth_hdr); | |
4cd57c80 | 1294 | |
aa9f979c | 1295 | hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len); |
4cd57c80 VY |
1296 | |
1297 | /* Adjust the chunk header to include the empty MAC */ | |
1298 | retval->chunk_hdr->length = | |
1299 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1300 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1301 | ||
1302 | return retval; | |
1303 | } | |
1304 | ||
1305 | ||
1da177e4 LT |
1306 | /******************************************************************** |
1307 | * 2nd Level Abstractions | |
1308 | ********************************************************************/ | |
1309 | ||
1310 | /* Turn an skb into a chunk. | |
1311 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1312 | * |
1313 | * sctpimpguide-05.txt Section 2.8.2 | |
1314 | * M1) Each time a new DATA chunk is transmitted | |
1315 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1316 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1317 | * and when to fast retransmit. | |
1318 | * | |
1da177e4 LT |
1319 | */ |
1320 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
327c0dab XL |
1321 | const struct sctp_association *asoc, |
1322 | struct sock *sk, gfp_t gfp) | |
1da177e4 LT |
1323 | { |
1324 | struct sctp_chunk *retval; | |
1325 | ||
cea8768f | 1326 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1327 | |
1328 | if (!retval) | |
1329 | goto nodata; | |
bb33381d DB |
1330 | if (!sk) |
1331 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1332 | |
79af02c2 | 1333 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1334 | retval->skb = skb; |
1335 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1336 | retval->singleton = 1; |
1da177e4 | 1337 | |
3dc0a548 | 1338 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1339 | |
1340 | /* Polish the bead hole. */ | |
1341 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1342 | INIT_LIST_HEAD(&retval->frag_list); | |
1343 | SCTP_DBG_OBJCNT_INC(chunk); | |
e7f02796 | 1344 | refcount_set(&retval->refcnt, 1); |
1da177e4 LT |
1345 | |
1346 | nodata: | |
1347 | return retval; | |
1348 | } | |
1349 | ||
1350 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1351 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1352 | union sctp_addr *dest) | |
1353 | { | |
f235fca3 | 1354 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1355 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1356 | } |
1357 | ||
1358 | /* Extract the source address from a chunk. */ | |
1359 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1360 | { | |
1361 | /* If we have a known transport, use that. */ | |
1362 | if (chunk->transport) { | |
6a1e5f33 | 1363 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1364 | } else { |
1365 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1366 | return &chunk->source; |
1da177e4 LT |
1367 | } |
1368 | } | |
1369 | ||
1370 | /* Create a new chunk, setting the type and flags headers from the | |
1371 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1372 | */ | |
072017b4 | 1373 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
327c0dab XL |
1374 | __u8 type, __u8 flags, int paylen, |
1375 | gfp_t gfp) | |
1da177e4 | 1376 | { |
922dbc5b | 1377 | struct sctp_chunkhdr *chunk_hdr; |
327c0dab | 1378 | struct sctp_chunk *retval; |
1da177e4 LT |
1379 | struct sk_buff *skb; |
1380 | struct sock *sk; | |
1381 | ||
1382 | /* No need to allocate LL here, as this is only a chunk. */ | |
922dbc5b | 1383 | skb = alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr) + paylen), gfp); |
1da177e4 LT |
1384 | if (!skb) |
1385 | goto nodata; | |
1386 | ||
1387 | /* Make room for the chunk header. */ | |
922dbc5b | 1388 | chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); |
1da177e4 LT |
1389 | chunk_hdr->type = type; |
1390 | chunk_hdr->flags = flags; | |
922dbc5b | 1391 | chunk_hdr->length = htons(sizeof(*chunk_hdr)); |
1da177e4 LT |
1392 | |
1393 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1394 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1395 | if (!retval) { |
1396 | kfree_skb(skb); | |
1397 | goto nodata; | |
1398 | } | |
1399 | ||
1400 | retval->chunk_hdr = chunk_hdr; | |
922dbc5b | 1401 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); |
1da177e4 | 1402 | |
4cd57c80 VY |
1403 | /* Determine if the chunk needs to be authenticated */ |
1404 | if (sctp_auth_send_cid(type, asoc)) | |
1405 | retval->auth = 1; | |
1406 | ||
1da177e4 LT |
1407 | return retval; |
1408 | nodata: | |
1409 | return NULL; | |
1410 | } | |
1411 | ||
072017b4 | 1412 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1413 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1414 | { |
cea8768f | 1415 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1416 | } |
1417 | ||
1418 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, | |
cea8768f MRL |
1419 | __u8 type, __u8 flags, int paylen, |
1420 | gfp_t gfp) | |
072017b4 | 1421 | { |
cea8768f | 1422 | struct sctp_chunk *chunk; |
072017b4 | 1423 | |
cea8768f | 1424 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1425 | if (chunk) |
1426 | sctp_control_set_owner_w(chunk); | |
1427 | ||
1428 | return chunk; | |
1429 | } | |
1da177e4 LT |
1430 | |
1431 | /* Release the memory occupied by a chunk. */ | |
1432 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1433 | { | |
a08de64d VY |
1434 | BUG_ON(!list_empty(&chunk->list)); |
1435 | list_del_init(&chunk->transmitted_list); | |
1436 | ||
c485658b DB |
1437 | consume_skb(chunk->skb); |
1438 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1439 | |
1440 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1441 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1442 | } | |
1443 | ||
1444 | /* Possibly, free the chunk. */ | |
1445 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1446 | { | |
1da177e4 LT |
1447 | /* Release our reference on the message tracker. */ |
1448 | if (chunk->msg) | |
1449 | sctp_datamsg_put(chunk->msg); | |
1450 | ||
1451 | sctp_chunk_put(chunk); | |
1452 | } | |
1453 | ||
1454 | /* Grab a reference to the chunk. */ | |
1455 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1456 | { | |
e7f02796 | 1457 | refcount_inc(&ch->refcnt); |
1da177e4 LT |
1458 | } |
1459 | ||
1460 | /* Release a reference to the chunk. */ | |
1461 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1462 | { | |
e7f02796 | 1463 | if (refcount_dec_and_test(&ch->refcnt)) |
1da177e4 LT |
1464 | sctp_chunk_destroy(ch); |
1465 | } | |
1466 | ||
1467 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1468 | * enough. | |
1469 | */ | |
1470 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1471 | { | |
1da177e4 | 1472 | int chunklen = ntohs(chunk->chunk_hdr->length); |
e2f036a9 | 1473 | int padlen = SCTP_PAD4(chunklen) - chunklen; |
327c0dab | 1474 | void *target; |
1da177e4 | 1475 | |
b952f4df | 1476 | skb_put_zero(chunk->skb, padlen); |
59ae1d12 | 1477 | target = skb_put_data(chunk->skb, data, len); |
1da177e4 LT |
1478 | |
1479 | /* Adjust the chunk length field. */ | |
1480 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1481 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1482 | |
1483 | return target; | |
1484 | } | |
1485 | ||
5fa782c2 NH |
1486 | /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient |
1487 | * space in the chunk | |
1488 | */ | |
6daaf0de | 1489 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, |
1490 | int len, const void *data) | |
5fa782c2 | 1491 | { |
2e3219b5 | 1492 | if (skb_tailroom(chunk->skb) >= len) |
5fa782c2 NH |
1493 | return sctp_addto_chunk(chunk, len, data); |
1494 | else | |
1495 | return NULL; | |
1496 | } | |
1497 | ||
1da177e4 LT |
1498 | /* Append bytes from user space to the end of a chunk. Will panic if |
1499 | * chunk is not big enough. | |
1500 | * Returns a kernel err value. | |
1501 | */ | |
e0eb093e AV |
1502 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1503 | struct iov_iter *from) | |
1da177e4 | 1504 | { |
e0eb093e | 1505 | void *target; |
1da177e4 LT |
1506 | |
1507 | /* Make room in chunk for data. */ | |
1508 | target = skb_put(chunk->skb, len); | |
1509 | ||
1510 | /* Copy data (whole iovec) into chunk */ | |
3b6d4dbf | 1511 | if (!copy_from_iter_full(target, len, from)) |
e0eb093e | 1512 | return -EFAULT; |
1da177e4 LT |
1513 | |
1514 | /* Adjust the chunk length field. */ | |
1515 | chunk->chunk_hdr->length = | |
1516 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1517 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1518 | |
e0eb093e | 1519 | return 0; |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | /* Helper function to assign a TSN if needed. This assumes that both | |
1523 | * the data_hdr and association have already been assigned. | |
1524 | */ | |
1525 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1526 | { | |
ab3e5e7b | 1527 | struct sctp_stream *stream; |
327c0dab XL |
1528 | struct sctp_chunk *lchunk; |
1529 | struct sctp_datamsg *msg; | |
1530 | __u16 ssn, sid; | |
1da177e4 LT |
1531 | |
1532 | if (chunk->has_ssn) | |
1533 | return; | |
1534 | ||
ab3e5e7b VY |
1535 | /* All fragments will be on the same stream */ |
1536 | sid = ntohs(chunk->subh.data_hdr->stream); | |
cee360ab | 1537 | stream = &chunk->asoc->stream; |
1da177e4 | 1538 | |
ab3e5e7b VY |
1539 | /* Now assign the sequence number to the entire message. |
1540 | * All fragments must have the same stream sequence number. | |
1541 | */ | |
1542 | msg = chunk->msg; | |
1543 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1544 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1545 | ssn = 0; | |
1546 | } else { | |
1547 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
a8386317 | 1548 | ssn = sctp_ssn_next(stream, out, sid); |
ab3e5e7b | 1549 | else |
a8386317 | 1550 | ssn = sctp_ssn_peek(stream, out, sid); |
ab3e5e7b VY |
1551 | } |
1552 | ||
1553 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1554 | lchunk->has_ssn = 1; | |
1555 | } | |
1da177e4 LT |
1556 | } |
1557 | ||
1558 | /* Helper function to assign a TSN if needed. This assumes that both | |
1559 | * the data_hdr and association have already been assigned. | |
1560 | */ | |
1561 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1562 | { | |
1563 | if (!chunk->has_tsn) { | |
1564 | /* This is the last possible instant to | |
1565 | * assign a TSN. | |
1566 | */ | |
1567 | chunk->subh.data_hdr->tsn = | |
1568 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1569 | chunk->has_tsn = 1; | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | /* Create a CLOSED association to use with an incoming packet. */ | |
1574 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
327c0dab XL |
1575 | struct sctp_chunk *chunk, |
1576 | gfp_t gfp) | |
1da177e4 LT |
1577 | { |
1578 | struct sctp_association *asoc; | |
1c662018 | 1579 | enum sctp_scope scope; |
1da177e4 | 1580 | struct sk_buff *skb; |
1da177e4 LT |
1581 | |
1582 | /* Create the bare association. */ | |
1583 | scope = sctp_scope(sctp_source(chunk)); | |
1584 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1585 | if (!asoc) | |
1586 | goto nodata; | |
1587 | asoc->temp = 1; | |
1588 | skb = chunk->skb; | |
1589 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1590 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1591 | ||
1da177e4 LT |
1592 | nodata: |
1593 | return asoc; | |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | /* Build a cookie representing asoc. | |
1597 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1598 | */ | |
f48ef4c7 XL |
1599 | static struct sctp_cookie_param *sctp_pack_cookie( |
1600 | const struct sctp_endpoint *ep, | |
1601 | const struct sctp_association *asoc, | |
1602 | const struct sctp_chunk *init_chunk, | |
327c0dab XL |
1603 | int *cookie_len, const __u8 *raw_addrs, |
1604 | int addrs_len) | |
1da177e4 | 1605 | { |
1da177e4 | 1606 | struct sctp_signed_cookie *cookie; |
f48ef4c7 | 1607 | struct sctp_cookie_param *retval; |
1da177e4 | 1608 | int headersize, bodysize; |
1da177e4 | 1609 | |
9834a2bb VY |
1610 | /* Header size is static data prior to the actual cookie, including |
1611 | * any padding. | |
1612 | */ | |
3c918704 | 1613 | headersize = sizeof(struct sctp_paramhdr) + |
d808ad9a | 1614 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1615 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1616 | bodysize = sizeof(struct sctp_cookie) |
1617 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1618 | ||
1619 | /* Pad out the cookie to a multiple to make the signature | |
1620 | * functions simpler to write. | |
1621 | */ | |
1622 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1623 | bodysize += SCTP_COOKIE_MULTIPLE | |
1624 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1625 | *cookie_len = headersize + bodysize; | |
1626 | ||
1da177e4 LT |
1627 | /* Clear this memory since we are sending this data structure |
1628 | * out on the network. | |
1629 | */ | |
af997d8c ACM |
1630 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1631 | if (!retval) | |
1632 | goto nodata; | |
1633 | ||
1da177e4 LT |
1634 | cookie = (struct sctp_signed_cookie *) retval->body; |
1635 | ||
1636 | /* Set up the parameter header. */ | |
1637 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1638 | retval->p.length = htons(*cookie_len); | |
1639 | ||
1640 | /* Copy the cookie part of the association itself. */ | |
1641 | cookie->c = asoc->c; | |
1642 | /* Save the raw address list length in the cookie. */ | |
1643 | cookie->c.raw_addr_list_len = addrs_len; | |
1644 | ||
1645 | /* Remember PR-SCTP capability. */ | |
1646 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1647 | ||
0f3fffd8 ISJ |
1648 | /* Save adaptation indication in the cookie. */ |
1649 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1650 | |
1651 | /* Set an expiration time for the cookie. */ | |
52db882f | 1652 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1653 | ktime_get_real()); |
1da177e4 LT |
1654 | |
1655 | /* Copy the peer's init packet. */ | |
1656 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1657 | ntohs(init_chunk->chunk_hdr->length)); | |
1658 | ||
1659 | /* Copy the raw local address list of the association. */ | |
1660 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1661 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1662 | ||
d808ad9a | 1663 | if (sctp_sk(ep->base.sk)->hmac) { |
5821c769 HX |
1664 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); |
1665 | int err; | |
1b489e11 | 1666 | |
1da177e4 | 1667 | /* Sign the message. */ |
5821c769 HX |
1668 | desc->tfm = sctp_sk(ep->base.sk)->hmac; |
1669 | desc->flags = 0; | |
1670 | ||
1671 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1672 | sizeof(ep->secret_key)) ?: | |
1673 | crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, | |
1674 | cookie->signature); | |
1675 | shash_desc_zero(desc); | |
1676 | if (err) | |
1b489e11 | 1677 | goto free_cookie; |
1da177e4 LT |
1678 | } |
1679 | ||
1da177e4 | 1680 | return retval; |
1b489e11 HX |
1681 | |
1682 | free_cookie: | |
1683 | kfree(retval); | |
1684 | nodata: | |
1685 | *cookie_len = 0; | |
1686 | return NULL; | |
1da177e4 LT |
1687 | } |
1688 | ||
1689 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1690 | struct sctp_association *sctp_unpack_cookie( | |
327c0dab XL |
1691 | const struct sctp_endpoint *ep, |
1692 | const struct sctp_association *asoc, | |
1693 | struct sctp_chunk *chunk, gfp_t gfp, | |
1694 | int *error, struct sctp_chunk **errp) | |
1da177e4 LT |
1695 | { |
1696 | struct sctp_association *retval = NULL; | |
327c0dab | 1697 | int headersize, bodysize, fixed_size; |
1da177e4 | 1698 | struct sctp_signed_cookie *cookie; |
327c0dab | 1699 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 1700 | struct sctp_cookie *bear_cookie; |
313e7b4d | 1701 | __u8 *digest = ep->digest; |
1c662018 | 1702 | enum sctp_scope scope; |
327c0dab | 1703 | unsigned int len; |
52db882f | 1704 | ktime_t kt; |
1da177e4 | 1705 | |
9834a2bb VY |
1706 | /* Header size is static data prior to the actual cookie, including |
1707 | * any padding. | |
1708 | */ | |
922dbc5b | 1709 | headersize = sizeof(struct sctp_chunkhdr) + |
d808ad9a | 1710 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1711 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1712 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1713 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1714 | ||
1715 | /* Verify that the chunk looks like it even has a cookie. | |
1716 | * There must be enough room for our cookie and our peer's | |
1717 | * INIT chunk. | |
1718 | */ | |
1719 | len = ntohs(chunk->chunk_hdr->length); | |
1720 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1721 | goto malformed; | |
1722 | ||
1723 | /* Verify that the cookie has been padded out. */ | |
1724 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1725 | goto malformed; | |
1726 | ||
1727 | /* Process the cookie. */ | |
1728 | cookie = chunk->subh.cookie_hdr; | |
1729 | bear_cookie = &cookie->c; | |
1730 | ||
1731 | if (!sctp_sk(ep->base.sk)->hmac) | |
1732 | goto no_hmac; | |
1733 | ||
1734 | /* Check the signature. */ | |
5821c769 HX |
1735 | { |
1736 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); | |
1737 | int err; | |
1738 | ||
1739 | desc->tfm = sctp_sk(ep->base.sk)->hmac; | |
1740 | desc->flags = 0; | |
1741 | ||
1742 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1743 | sizeof(ep->secret_key)) ?: | |
1744 | crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, | |
1745 | digest); | |
1746 | shash_desc_zero(desc); | |
1747 | ||
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)) { |
1da177e4 LT |
1792 | /* |
1793 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1794 | * | |
1795 | * Cause of error | |
1796 | * --------------- | |
1797 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1798 | * Cookie that has expired. | |
1799 | */ | |
1800 | len = ntohs(chunk->chunk_hdr->length); | |
1801 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1802 | if (*errp) { | |
52db882f | 1803 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
34bcca28 | 1804 | __be32 n = htonl(usecs); |
1da177e4 | 1805 | |
1da177e4 | 1806 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
00f1c2df WY |
1807 | sizeof(n)); |
1808 | sctp_addto_chunk(*errp, sizeof(n), &n); | |
1da177e4 LT |
1809 | *error = -SCTP_IERROR_STALE_COOKIE; |
1810 | } else | |
1811 | *error = -SCTP_IERROR_NOMEM; | |
1812 | ||
1813 | goto fail; | |
1814 | } | |
1815 | ||
1816 | /* Make a new base association. */ | |
1817 | scope = sctp_scope(sctp_source(chunk)); | |
1818 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1819 | if (!retval) { | |
1820 | *error = -SCTP_IERROR_NOMEM; | |
1821 | goto fail; | |
1822 | } | |
1823 | ||
1824 | /* Set up our peer's port number. */ | |
1825 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1826 | ||
1827 | /* Populate the association from the cookie. */ | |
1828 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1829 | ||
1830 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1831 | GFP_ATOMIC) < 0) { | |
1832 | *error = -SCTP_IERROR_NOMEM; | |
1833 | goto fail; | |
1834 | } | |
1835 | ||
1836 | /* Also, add the destination address. */ | |
1837 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1838 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1839 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1840 | GFP_ATOMIC); | |
1da177e4 LT |
1841 | } |
1842 | ||
1843 | retval->next_tsn = retval->c.initial_tsn; | |
1844 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1845 | retval->addip_serial = retval->c.initial_tsn; | |
cc16f00f | 1846 | retval->strreset_outseq = retval->c.initial_tsn; |
1da177e4 LT |
1847 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1848 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1849 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1850 | |
1851 | /* The INIT stuff will be done by the side effects. */ | |
1852 | return retval; | |
1853 | ||
1854 | fail: | |
1855 | if (retval) | |
1856 | sctp_association_free(retval); | |
1857 | ||
1858 | return NULL; | |
1859 | ||
1860 | malformed: | |
1861 | /* Yikes! The packet is either corrupt or deliberately | |
1862 | * malformed. | |
1863 | */ | |
1864 | *error = -SCTP_IERROR_MALFORMED; | |
1865 | goto fail; | |
1866 | } | |
1867 | ||
1868 | /******************************************************************** | |
1869 | * 3rd Level Abstractions | |
1870 | ********************************************************************/ | |
1871 | ||
1872 | struct __sctp_missing { | |
9f81bcd9 AV |
1873 | __be32 num_missing; |
1874 | __be16 type; | |
bc10502d | 1875 | } __packed; |
1da177e4 LT |
1876 | |
1877 | /* | |
1878 | * Report a missing mandatory parameter. | |
1879 | */ | |
1880 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
34b4e29b | 1881 | enum sctp_param paramtype, |
1da177e4 LT |
1882 | struct sctp_chunk *chunk, |
1883 | struct sctp_chunk **errp) | |
1884 | { | |
1885 | struct __sctp_missing report; | |
1886 | __u16 len; | |
1887 | ||
e2f036a9 | 1888 | len = SCTP_PAD4(sizeof(report)); |
1da177e4 LT |
1889 | |
1890 | /* Make an ERROR chunk, preparing enough room for | |
1891 | * returning multiple unknown parameters. | |
1892 | */ | |
1893 | if (!*errp) | |
1894 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1895 | ||
1896 | if (*errp) { | |
1897 | report.num_missing = htonl(1); | |
1898 | report.type = paramtype; | |
ebdfcad4 | 1899 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1900 | sizeof(report)); |
1901 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1902 | } |
1903 | ||
1904 | /* Stop processing this chunk. */ | |
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | /* Report an Invalid Mandatory Parameter. */ | |
1909 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1910 | struct sctp_chunk *chunk, | |
1911 | struct sctp_chunk **errp) | |
1912 | { | |
1913 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1914 | ||
1915 | if (!*errp) | |
1916 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1917 | ||
1918 | if (*errp) | |
00f1c2df | 1919 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1920 | |
1921 | /* Stop processing this chunk. */ | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1926 | struct sctp_paramhdr *param, | |
1927 | const struct sctp_chunk *chunk, | |
1928 | struct sctp_chunk **errp) | |
1929 | { | |
7ab90804 VY |
1930 | /* This is a fatal error. Any accumulated non-fatal errors are |
1931 | * not reported. | |
1932 | */ | |
1933 | if (*errp) | |
1934 | sctp_chunk_free(*errp); | |
1935 | ||
1da177e4 | 1936 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1937 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1938 | |
1939 | return 0; | |
1940 | } | |
1941 | ||
1942 | ||
1943 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1944 | * send back an indicator to the peer. | |
1945 | */ | |
1946 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1947 | union sctp_params param, | |
1948 | struct sctp_chunk *chunk, | |
1949 | struct sctp_chunk **errp) | |
1950 | { | |
1951 | __u16 len = ntohs(param.p->length); | |
1952 | ||
7ab90804 VY |
1953 | /* Processing of the HOST_NAME parameter will generate an |
1954 | * ABORT. If we've accumulated any non-fatal errors, they | |
1955 | * would be unrecognized parameters and we should not include | |
1956 | * them in the ABORT. | |
1957 | */ | |
1958 | if (*errp) | |
1959 | sctp_chunk_free(*errp); | |
1960 | ||
1961 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1da177e4 | 1962 | |
00f1c2df WY |
1963 | if (*errp) { |
1964 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); | |
1965 | sctp_addto_chunk(*errp, len, param.v); | |
1966 | } | |
1da177e4 LT |
1967 | |
1968 | /* Stop processing this chunk. */ | |
1969 | return 0; | |
1970 | } | |
1971 | ||
f53b5b09 | 1972 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
d6701191 | 1973 | { |
3c918704 | 1974 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
d6701191 | 1975 | int have_asconf = 0; |
327c0dab | 1976 | int have_auth = 0; |
d6701191 VY |
1977 | int i; |
1978 | ||
1979 | for (i = 0; i < num_ext; i++) { | |
1980 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1981 | case SCTP_CID_AUTH: |
1982 | have_auth = 1; | |
1983 | break; | |
1984 | case SCTP_CID_ASCONF: | |
1985 | case SCTP_CID_ASCONF_ACK: | |
1986 | have_asconf = 1; | |
1987 | break; | |
d6701191 VY |
1988 | } |
1989 | } | |
1990 | ||
1991 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1992 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
1993 | * only if ADD-IP is turned on and we are not backward-compatible | |
1994 | * mode. | |
1995 | */ | |
e1fc3b14 | 1996 | if (net->sctp.addip_noauth) |
d6701191 VY |
1997 | return 1; |
1998 | ||
e1fc3b14 | 1999 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
d6701191 VY |
2000 | return 0; |
2001 | ||
2002 | return 1; | |
2003 | } | |
2004 | ||
131a47e3 | 2005 | static void sctp_process_ext_param(struct sctp_association *asoc, |
327c0dab | 2006 | union sctp_params param) |
131a47e3 | 2007 | { |
3c918704 | 2008 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
327c0dab | 2009 | struct net *net = sock_net(asoc->base.sk); |
131a47e3 VY |
2010 | int i; |
2011 | ||
2012 | for (i = 0; i < num_ext; i++) { | |
2013 | switch (param.ext->chunks[i]) { | |
c28445c3 XL |
2014 | case SCTP_CID_RECONF: |
2015 | if (asoc->reconf_enable && | |
2016 | !asoc->peer.reconf_capable) | |
2017 | asoc->peer.reconf_capable = 1; | |
2018 | break; | |
f7010e61 | 2019 | case SCTP_CID_FWD_TSN: |
28aa4c26 XL |
2020 | if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) |
2021 | asoc->peer.prsctp_capable = 1; | |
f7010e61 | 2022 | break; |
2023 | case SCTP_CID_AUTH: | |
2024 | /* if the peer reports AUTH, assume that he | |
2025 | * supports AUTH. | |
2026 | */ | |
b14878cc | 2027 | if (asoc->ep->auth_enable) |
f7010e61 | 2028 | asoc->peer.auth_capable = 1; |
2029 | break; | |
2030 | case SCTP_CID_ASCONF: | |
2031 | case SCTP_CID_ASCONF_ACK: | |
2032 | if (net->sctp.addip_enable) | |
2033 | asoc->peer.asconf_capable = 1; | |
2034 | break; | |
2035 | default: | |
2036 | break; | |
131a47e3 VY |
2037 | } |
2038 | } | |
2039 | } | |
2040 | ||
1da177e4 LT |
2041 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2042 | * | |
2043 | * The Parameter Types are encoded such that the | |
2044 | * highest-order two bits specify the action that must be | |
2045 | * taken if the processing endpoint does not recognize the | |
2046 | * Parameter Type. | |
2047 | * | |
7ab90804 VY |
2048 | * 00 - Stop processing this parameter; do not process any further |
2049 | * parameters within this chunk | |
1da177e4 | 2050 | * |
7ab90804 VY |
2051 | * 01 - Stop processing this parameter, do not process any further |
2052 | * parameters within this chunk, and report the unrecognized | |
2053 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2054 | * |
2055 | * 10 - Skip this parameter and continue processing. | |
2056 | * | |
2057 | * 11 - Skip this parameter and continue processing but | |
2058 | * report the unrecognized parameter in an | |
7ab90804 | 2059 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2060 | * |
2061 | * Return value: | |
7ab90804 VY |
2062 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2063 | * SCTP_IERROR_ERROR - stop and report an error. | |
2064 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2065 | */ |
4785c7ae XL |
2066 | static enum sctp_ierror sctp_process_unk_param( |
2067 | const struct sctp_association *asoc, | |
2068 | union sctp_params param, | |
2069 | struct sctp_chunk *chunk, | |
2070 | struct sctp_chunk **errp) | |
1da177e4 | 2071 | { |
7ab90804 | 2072 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2073 | |
2074 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2075 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2076 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2077 | break; |
2078 | case SCTP_PARAM_ACTION_SKIP: | |
2079 | break; | |
7ab90804 VY |
2080 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2081 | retval = SCTP_IERROR_ERROR; | |
2082 | /* Fall through */ | |
1da177e4 LT |
2083 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2084 | /* Make an ERROR chunk, preparing enough room for | |
2085 | * returning multiple unknown parameters. | |
2086 | */ | |
2087 | if (NULL == *errp) | |
5fa782c2 | 2088 | *errp = sctp_make_op_error_fixed(asoc, chunk); |
1da177e4 LT |
2089 | |
2090 | if (*errp) { | |
2205a6ea | 2091 | if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
e2f036a9 | 2092 | SCTP_PAD4(ntohs(param.p->length)))) |
2205a6ea | 2093 | sctp_addto_chunk_fixed(*errp, |
e2f036a9 | 2094 | SCTP_PAD4(ntohs(param.p->length)), |
2205a6ea | 2095 | param.v); |
1da177e4 LT |
2096 | } else { |
2097 | /* If there is no memory for generating the ERROR | |
2098 | * report as specified, an ABORT will be triggered | |
2099 | * to the peer and the association won't be | |
2100 | * established. | |
2101 | */ | |
7ab90804 | 2102 | retval = SCTP_IERROR_NOMEM; |
1da177e4 | 2103 | } |
1da177e4 LT |
2104 | break; |
2105 | default: | |
2106 | break; | |
2107 | } | |
2108 | ||
2109 | return retval; | |
2110 | } | |
2111 | ||
7ab90804 | 2112 | /* Verify variable length parameters |
1da177e4 | 2113 | * Return values: |
7ab90804 VY |
2114 | * SCTP_IERROR_ABORT - trigger an ABORT |
2115 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2116 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2117 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2118 | */ |
4785c7ae XL |
2119 | static enum sctp_ierror sctp_verify_param(struct net *net, |
2120 | const struct sctp_endpoint *ep, | |
2121 | const struct sctp_association *asoc, | |
2122 | union sctp_params param, | |
2123 | enum sctp_cid cid, | |
2124 | struct sctp_chunk *chunk, | |
2125 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2126 | { |
72da7b38 | 2127 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2128 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2129 | __u16 n_elt, id = 0; |
2130 | int i; | |
1da177e4 LT |
2131 | |
2132 | /* FIXME - This routine is not looking at each parameter per the | |
2133 | * chunk type, i.e., unrecognized parameters should be further | |
2134 | * identified based on the chunk id. | |
2135 | */ | |
2136 | ||
2137 | switch (param.p->type) { | |
2138 | case SCTP_PARAM_IPV4_ADDRESS: | |
2139 | case SCTP_PARAM_IPV6_ADDRESS: | |
2140 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2141 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2142 | case SCTP_PARAM_STATE_COOKIE: | |
2143 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2144 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2145 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2146 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2147 | break; |
2148 | ||
131a47e3 | 2149 | case SCTP_PARAM_SUPPORTED_EXT: |
f53b5b09 | 2150 | if (!sctp_verify_ext_param(net, param)) |
d6701191 | 2151 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2152 | break; |
2153 | ||
d6de3097 | 2154 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2155 | if (net->sctp.addip_enable) |
d6de3097 VY |
2156 | break; |
2157 | goto fallthrough; | |
2158 | ||
1da177e4 LT |
2159 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2160 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2161 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2162 | retval = SCTP_IERROR_ABORT; | |
2163 | break; | |
131a47e3 | 2164 | |
1da177e4 | 2165 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2166 | if (ep->prsctp_enable) |
1da177e4 | 2167 | break; |
730fc3d0 VY |
2168 | goto fallthrough; |
2169 | ||
2170 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2171 | if (!ep->auth_enable) |
730fc3d0 VY |
2172 | goto fallthrough; |
2173 | ||
2174 | /* SCTP-AUTH: Secion 6.1 | |
2175 | * If the random number is not 32 byte long the association | |
2176 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2177 | * cause 'Protocol Violation'. | |
2178 | */ | |
2179 | if (SCTP_AUTH_RANDOM_LENGTH != | |
3c918704 | 2180 | ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) { |
7ab90804 | 2181 | sctp_process_inv_paramlength(asoc, param.p, |
730fc3d0 | 2182 | chunk, err_chunk); |
7ab90804 VY |
2183 | retval = SCTP_IERROR_ABORT; |
2184 | } | |
730fc3d0 VY |
2185 | break; |
2186 | ||
2187 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2188 | if (!ep->auth_enable) |
730fc3d0 VY |
2189 | goto fallthrough; |
2190 | ||
2191 | /* SCTP-AUTH: Section 3.2 | |
2192 | * The CHUNKS parameter MUST be included once in the INIT or | |
2193 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2194 | * chunks. Its maximum length is 260 bytes. | |
2195 | */ | |
7ab90804 VY |
2196 | if (260 < ntohs(param.p->length)) { |
2197 | sctp_process_inv_paramlength(asoc, param.p, | |
2198 | chunk, err_chunk); | |
2199 | retval = SCTP_IERROR_ABORT; | |
2200 | } | |
730fc3d0 VY |
2201 | break; |
2202 | ||
2203 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2204 | if (!ep->auth_enable) |
72da7b38 WY |
2205 | goto fallthrough; |
2206 | ||
2207 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
3c918704 XL |
2208 | n_elt = (ntohs(param.p->length) - |
2209 | sizeof(struct sctp_paramhdr)) >> 1; | |
72da7b38 WY |
2210 | |
2211 | /* SCTP-AUTH: Section 6.1 | |
2212 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2213 | * included in the HMAC-ALGO parameter. | |
2214 | */ | |
2215 | for (i = 0; i < n_elt; i++) { | |
2216 | id = ntohs(hmacs->hmac_ids[i]); | |
2217 | ||
2218 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2219 | break; | |
2220 | } | |
2221 | ||
2222 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2223 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2224 | err_chunk); | |
2225 | retval = SCTP_IERROR_ABORT; | |
2226 | } | |
2227 | break; | |
730fc3d0 | 2228 | fallthrough: |
1da177e4 | 2229 | default: |
bb33381d DB |
2230 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2231 | __func__, ntohs(param.p->type), cid); | |
2232 | ||
7ab90804 | 2233 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2234 | break; |
2235 | } | |
2236 | return retval; | |
2237 | } | |
2238 | ||
2239 | /* Verify the INIT packet before we process it. */ | |
b14878cc | 2240 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
6d85e68f | 2241 | const struct sctp_association *asoc, enum sctp_cid cid, |
01a992be XL |
2242 | struct sctp_init_chunk *peer_init, |
2243 | struct sctp_chunk *chunk, struct sctp_chunk **errp) | |
1da177e4 LT |
2244 | { |
2245 | union sctp_params param; | |
7613f5fe | 2246 | bool has_cookie = false; |
7ab90804 | 2247 | int result; |
1da177e4 | 2248 | |
7613f5fe DB |
2249 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2250 | * also mandatory, but is not checked here since the valid range | |
2251 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2252 | */ | |
2253 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2254 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2255 | peer_init->init_hdr.init_tag == 0 || | |
2256 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2257 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2258 | |
1da177e4 | 2259 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2260 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2261 | has_cookie = true; | |
2262 | } | |
1da177e4 LT |
2263 | |
2264 | /* There is a possibility that a parameter length was bad and | |
2265 | * in that case we would have stoped walking the parameters. | |
2266 | * The current param.p would point at the bad one. | |
2267 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2268 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2269 | * error handling code build and send the packet. | |
2270 | */ | |
26ac8e5f | 2271 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2272 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2273 | |
2274 | /* The only missing mandatory param possible today is | |
2275 | * the state cookie for an INIT-ACK chunk. | |
2276 | */ | |
7ab90804 VY |
2277 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2278 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2279 | chunk, errp); | |
1da177e4 | 2280 | |
7ab90804 | 2281 | /* Verify all the variable length parameters */ |
1da177e4 | 2282 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2283 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2284 | chunk, errp); | |
7ab90804 | 2285 | switch (result) { |
f7010e61 | 2286 | case SCTP_IERROR_ABORT: |
2287 | case SCTP_IERROR_NOMEM: | |
2288 | return 0; | |
2289 | case SCTP_IERROR_ERROR: | |
2290 | return 1; | |
2291 | case SCTP_IERROR_NO_ERROR: | |
2292 | default: | |
2293 | break; | |
1da177e4 LT |
2294 | } |
2295 | ||
2296 | } /* for (loop through all parameters) */ | |
2297 | ||
2298 | return 1; | |
2299 | } | |
2300 | ||
2301 | /* Unpack the parameters in an INIT packet into an association. | |
2302 | * Returns 0 on failure, else success. | |
2303 | * FIXME: This is an association method. | |
2304 | */ | |
de6becdc | 2305 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2306 | const union sctp_addr *peer_addr, |
01a992be | 2307 | struct sctp_init_chunk *peer_init, gfp_t gfp) |
1da177e4 | 2308 | { |
e1fc3b14 | 2309 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2310 | struct sctp_transport *transport; |
2311 | struct list_head *pos, *temp; | |
327c0dab | 2312 | union sctp_params param; |
de6becdc | 2313 | union sctp_addr addr; |
327c0dab | 2314 | struct sctp_af *af; |
de6becdc | 2315 | int src_match = 0; |
327c0dab | 2316 | char *cookie; |
1da177e4 LT |
2317 | |
2318 | /* We must include the address that the INIT packet came from. | |
2319 | * This is the only address that matters for an INIT packet. | |
2320 | * When processing a COOKIE ECHO, we retrieve the from address | |
2321 | * of the INIT from the cookie. | |
2322 | */ | |
2323 | ||
2324 | /* This implementation defaults to making the first transport | |
2325 | * added as the primary transport. The source address seems to | |
2326 | * be a a better choice than any of the embedded addresses. | |
2327 | */ | |
cb3f837b | 2328 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2329 | goto nomem; |
2330 | ||
2331 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2332 | src_match = 1; | |
1da177e4 LT |
2333 | |
2334 | /* Process the initialization parameters. */ | |
1da177e4 | 2335 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2336 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2337 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2338 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2339 | af->from_addr_param(&addr, param.addr, | |
2340 | chunk->sctp_hdr->source, 0); | |
2341 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2342 | src_match = 1; | |
2343 | } | |
1da177e4 LT |
2344 | |
2345 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2346 | goto clean_up; |
1da177e4 LT |
2347 | } |
2348 | ||
de6becdc WY |
2349 | /* source address of chunk may not match any valid address */ |
2350 | if (!src_match) | |
2351 | goto clean_up; | |
2352 | ||
730fc3d0 VY |
2353 | /* AUTH: After processing the parameters, make sure that we |
2354 | * have all the required info to potentially do authentications. | |
2355 | */ | |
2356 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2357 | !asoc->peer.peer_hmacs)) | |
2358 | asoc->peer.auth_capable = 0; | |
2359 | ||
d6701191 VY |
2360 | /* In a non-backward compatible mode, if the peer claims |
2361 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2362 | * that we MUST ABORT the association. Section 6. The section | |
2363 | * also give us an option to silently ignore the packet, which | |
2364 | * is what we'll do here. | |
6b2f9cb6 | 2365 | */ |
e1fc3b14 | 2366 | if (!net->sctp.addip_noauth && |
73d9c4fd | 2367 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
6b2f9cb6 VY |
2368 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2369 | SCTP_PARAM_DEL_IP | | |
2370 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2371 | asoc->peer.asconf_capable = 0; |
d6701191 | 2372 | goto clean_up; |
6b2f9cb6 VY |
2373 | } |
2374 | ||
3f7a87d2 FF |
2375 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2376 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2377 | transport = list_entry(pos, struct sctp_transport, transports); | |
2378 | if (transport->state == SCTP_UNKNOWN) { | |
2379 | sctp_assoc_rm_peer(asoc, transport); | |
2380 | } | |
2381 | } | |
2382 | ||
1da177e4 LT |
2383 | /* The fixed INIT headers are always in network byte |
2384 | * order. | |
2385 | */ | |
2386 | asoc->peer.i.init_tag = | |
2387 | ntohl(peer_init->init_hdr.init_tag); | |
2388 | asoc->peer.i.a_rwnd = | |
2389 | ntohl(peer_init->init_hdr.a_rwnd); | |
2390 | asoc->peer.i.num_outbound_streams = | |
2391 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2392 | asoc->peer.i.num_inbound_streams = | |
2393 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2394 | asoc->peer.i.initial_tsn = | |
2395 | ntohl(peer_init->init_hdr.initial_tsn); | |
2396 | ||
cc16f00f XL |
2397 | asoc->strreset_inseq = asoc->peer.i.initial_tsn; |
2398 | ||
1da177e4 LT |
2399 | /* Apply the upper bounds for output streams based on peer's |
2400 | * number of inbound streams. | |
2401 | */ | |
2402 | if (asoc->c.sinit_num_ostreams > | |
2403 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2404 | asoc->c.sinit_num_ostreams = | |
2405 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2406 | } | |
2407 | ||
2408 | if (asoc->c.sinit_max_instreams > | |
2409 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2410 | asoc->c.sinit_max_instreams = | |
2411 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2412 | } | |
2413 | ||
2414 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2415 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2416 | ||
2417 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2418 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2419 | ||
2420 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2421 | cookie = asoc->peer.cookie; | |
2422 | if (cookie) { | |
af997d8c | 2423 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2424 | if (!asoc->peer.cookie) |
2425 | goto clean_up; | |
1da177e4 LT |
2426 | } |
2427 | ||
2428 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2429 | * high (for example, implementations MAY use the size of the receiver | |
2430 | * advertised window). | |
2431 | */ | |
9dbc15f0 RD |
2432 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2433 | transports) { | |
1da177e4 LT |
2434 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2435 | } | |
2436 | ||
2437 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2438 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2439 | asoc->peer.i.initial_tsn, gfp)) | |
2440 | goto clean_up; | |
1da177e4 LT |
2441 | |
2442 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2443 | * | |
2444 | * The stream sequence number in all the streams shall start | |
2445 | * from 0 when the association is established. Also, when the | |
2446 | * stream sequence number reaches the value 65535 the next | |
2447 | * stream sequence number shall be set to 0. | |
2448 | */ | |
2449 | ||
ff356414 XL |
2450 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
2451 | asoc->c.sinit_max_instreams, gfp)) | |
7e062977 | 2452 | goto clean_up; |
1da177e4 | 2453 | |
7e062977 XL |
2454 | if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) |
2455 | goto clean_up; | |
1da177e4 LT |
2456 | |
2457 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2458 | * | |
2459 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2460 | * remote endpoint it should do the following: | |
2461 | * ... | |
2462 | * A2) A serial number should be assigned to the Chunk. The serial | |
2463 | * number should be a monotonically increasing number. All serial | |
2464 | * numbers are defined to be initialized at the start of the | |
2465 | * association to the same value as the Initial TSN. | |
2466 | */ | |
2467 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2468 | return 1; | |
2469 | ||
2470 | clean_up: | |
2471 | /* Release the transport structures. */ | |
2472 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2473 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2474 | if (transport->state != SCTP_ACTIVE) |
2475 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2476 | } |
3f7a87d2 | 2477 | |
1da177e4 LT |
2478 | nomem: |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | ||
2483 | /* Update asoc with the option described in param. | |
2484 | * | |
2485 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2486 | * | |
2487 | * asoc is the association to update. | |
2488 | * param is the variable length parameter to use for update. | |
2489 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2490 | * If the current packet is an INIT we want to minimize the amount of | |
2491 | * work we do. In particular, we should not build transport | |
2492 | * structures for the addresses. | |
2493 | */ | |
2494 | static int sctp_process_param(struct sctp_association *asoc, | |
2495 | union sctp_params param, | |
2496 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2497 | gfp_t gfp) |
1da177e4 | 2498 | { |
e7ff4a70 | 2499 | struct net *net = sock_net(asoc->base.sk); |
327c0dab | 2500 | struct sctp_endpoint *ep = asoc->ep; |
d6de3097 VY |
2501 | union sctp_addr_param *addr_param; |
2502 | struct sctp_transport *t; | |
327c0dab XL |
2503 | enum sctp_scope scope; |
2504 | union sctp_addr addr; | |
2505 | struct sctp_af *af; | |
2506 | int retval = 1, i; | |
2507 | u32 stale; | |
2508 | __u16 sat; | |
1da177e4 LT |
2509 | |
2510 | /* We maintain all INIT parameters in network byte order all the | |
2511 | * time. This allows us to not worry about whether the parameters | |
2512 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2513 | */ | |
2514 | switch (param.p->type) { | |
2515 | case SCTP_PARAM_IPV6_ADDRESS: | |
2516 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2517 | break; | |
7dab83de VY |
2518 | goto do_addr_param; |
2519 | ||
1da177e4 | 2520 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2521 | /* v4 addresses are not allowed on v6-only socket */ |
2522 | if (ipv6_only_sock(asoc->base.sk)) | |
2523 | break; | |
2524 | do_addr_param: | |
1da177e4 | 2525 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2526 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2527 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2528 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2529 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2530 | return 0; |
2531 | break; | |
2532 | ||
2533 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2534 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2535 | break; |
2536 | ||
2537 | stale = ntohl(param.life->lifespan_increment); | |
2538 | ||
2539 | /* Suggested Cookie Life span increment's unit is msec, | |
2540 | * (1/1000sec). | |
2541 | */ | |
52db882f | 2542 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2543 | break; |
2544 | ||
2545 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2546 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2547 | break; |
2548 | ||
2549 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2550 | /* Turn off the default values first so we'll know which | |
2551 | * ones are really set by the peer. | |
2552 | */ | |
2553 | asoc->peer.ipv4_address = 0; | |
2554 | asoc->peer.ipv6_address = 0; | |
2555 | ||
140ee960 GJ |
2556 | /* Assume that peer supports the address family |
2557 | * by which it sends a packet. | |
2558 | */ | |
2559 | if (peer_addr->sa.sa_family == AF_INET6) | |
2560 | asoc->peer.ipv6_address = 1; | |
2561 | else if (peer_addr->sa.sa_family == AF_INET) | |
2562 | asoc->peer.ipv4_address = 1; | |
2563 | ||
1da177e4 | 2564 | /* Cycle through address types; avoid divide by 0. */ |
3c918704 | 2565 | sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2566 | if (sat) |
2567 | sat /= sizeof(__u16); | |
2568 | ||
2569 | for (i = 0; i < sat; ++i) { | |
2570 | switch (param.sat->types[i]) { | |
2571 | case SCTP_PARAM_IPV4_ADDRESS: | |
2572 | asoc->peer.ipv4_address = 1; | |
2573 | break; | |
2574 | ||
2575 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2576 | if (PF_INET6 == asoc->base.sk->sk_family) |
2577 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2578 | break; |
2579 | ||
2580 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2581 | asoc->peer.hostname_address = 1; | |
2582 | break; | |
2583 | ||
2584 | default: /* Just ignore anything else. */ | |
2585 | break; | |
3ff50b79 | 2586 | } |
1da177e4 LT |
2587 | } |
2588 | break; | |
2589 | ||
2590 | case SCTP_PARAM_STATE_COOKIE: | |
2591 | asoc->peer.cookie_len = | |
3c918704 | 2592 | ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2593 | asoc->peer.cookie = param.cookie->body; |
2594 | break; | |
2595 | ||
2596 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2597 | /* Would be odd to receive, but it causes no problems. */ | |
2598 | break; | |
2599 | ||
2600 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2601 | /* Rejected during verify stage. */ | |
2602 | break; | |
2603 | ||
2604 | case SCTP_PARAM_ECN_CAPABLE: | |
2605 | asoc->peer.ecn_capable = 1; | |
2606 | break; | |
2607 | ||
0f3fffd8 | 2608 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2609 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2610 | break; |
2611 | ||
d6de3097 | 2612 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2613 | if (!net->sctp.addip_enable) |
0ef46e28 VY |
2614 | goto fall_through; |
2615 | ||
8b32f234 | 2616 | addr_param = param.v + sizeof(struct sctp_addip_param); |
d6de3097 | 2617 | |
cfbf654e | 2618 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2619 | if (af == NULL) |
2620 | break; | |
2621 | ||
d6de3097 VY |
2622 | af->from_addr_param(&addr, addr_param, |
2623 | htons(asoc->peer.port), 0); | |
2624 | ||
2625 | /* if the address is invalid, we can't process it. | |
2626 | * XXX: see spec for what to do. | |
2627 | */ | |
2628 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2629 | break; | |
2630 | ||
2631 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2632 | if (!t) | |
2633 | break; | |
2634 | ||
2635 | sctp_assoc_set_primary(asoc, t); | |
2636 | break; | |
2637 | ||
131a47e3 VY |
2638 | case SCTP_PARAM_SUPPORTED_EXT: |
2639 | sctp_process_ext_param(asoc, param); | |
2640 | break; | |
2641 | ||
1da177e4 | 2642 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2643 | if (asoc->prsctp_enable) { |
1da177e4 LT |
2644 | asoc->peer.prsctp_capable = 1; |
2645 | break; | |
2646 | } | |
d808ad9a | 2647 | /* Fall Through */ |
730fc3d0 VY |
2648 | goto fall_through; |
2649 | ||
2650 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2651 | if (!ep->auth_enable) |
730fc3d0 VY |
2652 | goto fall_through; |
2653 | ||
2654 | /* Save peer's random parameter */ | |
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 */ | |
2668 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2669 | ntohs(param.p->length), gfp); | |
2670 | if (!asoc->peer.peer_hmacs) { | |
2671 | retval = 0; | |
2672 | break; | |
2673 | } | |
2674 | ||
2675 | /* Set the default HMAC the peer requested*/ | |
2676 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2677 | break; | |
2678 | ||
2679 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2680 | if (!ep->auth_enable) |
730fc3d0 VY |
2681 | goto fall_through; |
2682 | ||
2683 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2684 | ntohs(param.p->length), gfp); | |
2685 | if (!asoc->peer.peer_chunks) | |
2686 | retval = 0; | |
2687 | break; | |
2688 | fall_through: | |
1da177e4 LT |
2689 | default: |
2690 | /* Any unrecognized parameters should have been caught | |
2691 | * and handled by sctp_verify_param() which should be | |
2692 | * called prior to this routine. Simply log the error | |
2693 | * here. | |
2694 | */ | |
bb33381d DB |
2695 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2696 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2697 | break; |
3ff50b79 | 2698 | } |
1da177e4 LT |
2699 | |
2700 | return retval; | |
2701 | } | |
2702 | ||
2703 | /* Select a new verification tag. */ | |
2704 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2705 | { | |
2706 | /* I believe that this random number generator complies with RFC1750. | |
2707 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2708 | */ | |
2709 | __u32 x; | |
2710 | ||
2711 | do { | |
2712 | get_random_bytes(&x, sizeof(__u32)); | |
2713 | } while (x == 0); | |
2714 | ||
2715 | return x; | |
2716 | } | |
2717 | ||
2718 | /* Select an initial TSN to send during startup. */ | |
2719 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2720 | { | |
2721 | __u32 retval; | |
2722 | ||
2723 | get_random_bytes(&retval, sizeof(__u32)); | |
2724 | return retval; | |
2725 | } | |
2726 | ||
2727 | /* | |
2728 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2729 | * 0 1 2 3 | |
2730 | * 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 | |
2731 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2732 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2733 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2734 | * | Serial Number | | |
2735 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2736 | * | Address Parameter | | |
2737 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2738 | * | ASCONF Parameter #1 | | |
2739 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2740 | * \ \ | |
2741 | * / .... / | |
2742 | * \ \ | |
2743 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2744 | * | ASCONF Parameter #N | | |
2745 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2746 | * | |
d808ad9a | 2747 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2748 | */ |
2749 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2750 | union sctp_addr *addr, | |
2751 | int vparam_len) | |
2752 | { | |
65205cc4 | 2753 | struct sctp_addiphdr asconf; |
1da177e4 LT |
2754 | struct sctp_chunk *retval; |
2755 | int length = sizeof(asconf) + vparam_len; | |
2756 | union sctp_addr_param addrparam; | |
2757 | int addrlen; | |
2758 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2759 | ||
2760 | addrlen = af->to_addr_param(addr, &addrparam); | |
2761 | if (!addrlen) | |
2762 | return NULL; | |
2763 | length += addrlen; | |
2764 | ||
2765 | /* Create the chunk. */ | |
cea8768f MRL |
2766 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2767 | GFP_ATOMIC); | |
1da177e4 LT |
2768 | if (!retval) |
2769 | return NULL; | |
2770 | ||
2771 | asconf.serial = htonl(asoc->addip_serial++); | |
2772 | ||
2773 | retval->subh.addip_hdr = | |
2774 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2775 | retval->param_hdr.v = | |
2776 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2777 | ||
2778 | return retval; | |
2779 | } | |
2780 | ||
2781 | /* ADDIP | |
2782 | * 3.2.1 Add IP Address | |
2783 | * 0 1 2 3 | |
2784 | * 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 | |
2785 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2786 | * | Type = 0xC001 | Length = Variable | | |
2787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2788 | * | ASCONF-Request Correlation ID | | |
2789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2790 | * | Address Parameter | | |
2791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2792 | * | |
2793 | * 3.2.2 Delete IP Address | |
2794 | * 0 1 2 3 | |
2795 | * 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 | |
2796 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2797 | * | Type = 0xC002 | Length = Variable | | |
2798 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2799 | * | ASCONF-Request Correlation ID | | |
2800 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2801 | * | Address Parameter | | |
2802 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2803 | * | |
2804 | */ | |
2805 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
327c0dab XL |
2806 | union sctp_addr *laddr, |
2807 | struct sockaddr *addrs, | |
2808 | int addrcnt, __be16 flags) | |
1da177e4 | 2809 | { |
327c0dab | 2810 | union sctp_addr_param addr_param; |
8b32f234 | 2811 | struct sctp_addip_param param; |
327c0dab XL |
2812 | int paramlen = sizeof(param); |
2813 | struct sctp_chunk *retval; | |
2814 | int addr_param_len = 0; | |
2815 | union sctp_addr *addr; | |
2816 | int totallen = 0, i; | |
2817 | int del_pickup = 0; | |
2818 | struct sctp_af *af; | |
2819 | void *addr_buf; | |
1da177e4 LT |
2820 | |
2821 | /* Get total length of all the address parameters. */ | |
2822 | addr_buf = addrs; | |
2823 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2824 | addr = addr_buf; |
1da177e4 LT |
2825 | af = sctp_get_af_specific(addr->v4.sin_family); |
2826 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2827 | ||
2828 | totallen += paramlen; | |
2829 | totallen += addr_param_len; | |
2830 | ||
2831 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2832 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2833 | /* reuse the parameter length from the same scope one */ | |
2834 | totallen += paramlen; | |
2835 | totallen += addr_param_len; | |
2836 | del_pickup = 1; | |
bb33381d DB |
2837 | |
2838 | pr_debug("%s: picked same-scope del_pending addr, " | |
2839 | "totallen for all addresses is %d\n", | |
2840 | __func__, totallen); | |
8a07eb0a | 2841 | } |
1da177e4 LT |
2842 | } |
2843 | ||
2844 | /* Create an asconf chunk with the required length. */ | |
2845 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2846 | if (!retval) | |
2847 | return NULL; | |
2848 | ||
2849 | /* Add the address parameters to the asconf chunk. */ | |
2850 | addr_buf = addrs; | |
2851 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2852 | addr = addr_buf; |
1da177e4 LT |
2853 | af = sctp_get_af_specific(addr->v4.sin_family); |
2854 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2855 | param.param_hdr.type = flags; | |
2856 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2857 | param.crr_id = htonl(i); |
1da177e4 LT |
2858 | |
2859 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2860 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2861 | ||
2862 | addr_buf += af->sockaddr_len; | |
2863 | } | |
8a07eb0a MH |
2864 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2865 | addr = asoc->asconf_addr_del_pending; | |
2866 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2867 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2868 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2869 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2870 | param.crr_id = htonl(i); |
8a07eb0a MH |
2871 | |
2872 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2873 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2874 | } | |
1da177e4 LT |
2875 | return retval; |
2876 | } | |
2877 | ||
2878 | /* ADDIP | |
2879 | * 3.2.4 Set Primary IP Address | |
2880 | * 0 1 2 3 | |
2881 | * 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 | |
2882 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2883 | * | Type =0xC004 | Length = Variable | | |
2884 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2885 | * | ASCONF-Request Correlation ID | | |
2886 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2887 | * | Address Parameter | | |
2888 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2889 | * | |
d808ad9a | 2890 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2891 | */ |
2892 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2893 | union sctp_addr *addr) | |
2894 | { | |
327c0dab XL |
2895 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2896 | union sctp_addr_param addrparam; | |
8b32f234 | 2897 | struct sctp_addip_param param; |
327c0dab XL |
2898 | struct sctp_chunk *retval; |
2899 | int len = sizeof(param); | |
2900 | int addrlen; | |
1da177e4 LT |
2901 | |
2902 | addrlen = af->to_addr_param(addr, &addrparam); | |
2903 | if (!addrlen) | |
2904 | return NULL; | |
2905 | len += addrlen; | |
2906 | ||
2907 | /* Create the chunk and make asconf header. */ | |
2908 | retval = sctp_make_asconf(asoc, addr, len); | |
2909 | if (!retval) | |
2910 | return NULL; | |
2911 | ||
2912 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2913 | param.param_hdr.length = htons(len); | |
2914 | param.crr_id = 0; | |
2915 | ||
2916 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2917 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2918 | ||
2919 | return retval; | |
2920 | } | |
2921 | ||
2922 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2923 | * 0 1 2 3 | |
2924 | * 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 | |
2925 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2926 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2927 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2928 | * | Serial Number | | |
2929 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2930 | * | ASCONF Parameter Response#1 | | |
2931 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2932 | * \ \ | |
2933 | * / .... / | |
2934 | * \ \ | |
2935 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2936 | * | ASCONF Parameter Response#N | | |
2937 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2938 | * | |
d808ad9a | 2939 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2940 | */ |
2941 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2942 | __u32 serial, int vparam_len) | |
2943 | { | |
327c0dab XL |
2944 | struct sctp_addiphdr asconf; |
2945 | struct sctp_chunk *retval; | |
2946 | int length = sizeof(asconf) + vparam_len; | |
1da177e4 LT |
2947 | |
2948 | /* Create the chunk. */ | |
cea8768f MRL |
2949 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2950 | GFP_ATOMIC); | |
1da177e4 LT |
2951 | if (!retval) |
2952 | return NULL; | |
2953 | ||
2954 | asconf.serial = htonl(serial); | |
2955 | ||
2956 | retval->subh.addip_hdr = | |
2957 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2958 | ||
2959 | return retval; | |
2960 | } | |
2961 | ||
2962 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2963 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
8b32f234 XL |
2964 | __be16 err_code, |
2965 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 2966 | { |
8b32f234 | 2967 | struct sctp_addip_param ack_param; |
327c0dab XL |
2968 | struct sctp_errhdr err_param; |
2969 | int asconf_param_len = 0; | |
2970 | int err_param_len = 0; | |
2971 | __be16 response_type; | |
1da177e4 LT |
2972 | |
2973 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2974 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2975 | } else { | |
2976 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2977 | err_param_len = sizeof(err_param); | |
2978 | if (asconf_param) | |
2979 | asconf_param_len = | |
2980 | ntohs(asconf_param->param_hdr.length); | |
2981 | } | |
2982 | ||
d808ad9a | 2983 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2984 | ack_param.param_hdr.type = response_type; |
2985 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2986 | err_param_len + | |
2987 | asconf_param_len); | |
2988 | ack_param.crr_id = crr_id; | |
2989 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2990 | ||
2991 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2992 | return; | |
2993 | ||
2994 | /* Add Error Cause parameter. */ | |
2995 | err_param.cause = err_code; | |
2996 | err_param.length = htons(err_param_len + asconf_param_len); | |
2997 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
2998 | ||
2999 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3000 | if (asconf_param) | |
3001 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3002 | } | |
3003 | ||
3004 | /* Process a asconf parameter. */ | |
dbc16db1 | 3005 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
8b32f234 XL |
3006 | struct sctp_chunk *asconf, |
3007 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 3008 | { |
327c0dab | 3009 | union sctp_addr_param *addr_param; |
1da177e4 | 3010 | struct sctp_transport *peer; |
1da177e4 | 3011 | union sctp_addr addr; |
327c0dab | 3012 | struct sctp_af *af; |
5f242a13 | 3013 | |
8b32f234 | 3014 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
c1cc678a | 3015 | |
44e65c1e WY |
3016 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3017 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3018 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3019 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3020 | ||
6a435732 | 3021 | switch (addr_param->p.type) { |
c4492586 WY |
3022 | case SCTP_PARAM_IPV6_ADDRESS: |
3023 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3024 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3025 | break; |
3026 | case SCTP_PARAM_IPV4_ADDRESS: | |
3027 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3028 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3029 | break; |
3030 | default: | |
945e5abc | 3031 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3032 | } |
3033 | ||
6a435732 | 3034 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3035 | if (unlikely(!af)) |
945e5abc | 3036 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3037 | |
dd86d136 | 3038 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3039 | |
3040 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3041 | * or multicast address. | |
3042 | * (note: wildcard is permitted and requires special handling so | |
3043 | * make sure we check for that) | |
3044 | */ | |
3045 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3046 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3047 | |
1da177e4 LT |
3048 | switch (asconf_param->param_hdr.type) { |
3049 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3050 | /* Section 4.2.1: |
3051 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3052 | * address of the packet MUST be added. | |
3053 | */ | |
3054 | if (af->is_any(&addr)) | |
3055 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3056 | ||
1da177e4 | 3057 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3058 | * request and does not have the local resources to add this |
3059 | * new address to the association, it MUST return an Error | |
3060 | * Cause TLV set to the new error code 'Operation Refused | |
3061 | * Due to Resource Shortage'. | |
3062 | */ | |
1da177e4 | 3063 | |
dd86d136 | 3064 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3065 | if (!peer) |
3066 | return SCTP_ERROR_RSRC_LOW; | |
3067 | ||
3068 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3069 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3070 | asoc->new_transport = peer; |
1da177e4 LT |
3071 | break; |
3072 | case SCTP_PARAM_DEL_IP: | |
3073 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3074 | * last remaining IP address of a peer endpoint, the receiver |
3075 | * MUST send an Error Cause TLV with the error cause set to the | |
3076 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3077 | */ | |
42e30bf3 | 3078 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3079 | return SCTP_ERROR_DEL_LAST_IP; |
3080 | ||
3081 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3082 | * address which is also the source address of the IP packet | |
3083 | * which contained the ASCONF chunk, the receiver MUST reject | |
3084 | * this request. To reject the request the receiver MUST send | |
3085 | * an Error Cause TLV set to the new error code 'Request to | |
3086 | * Delete Source IP Address' | |
3087 | */ | |
b1364104 | 3088 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3089 | return SCTP_ERROR_DEL_SRC_IP; |
3090 | ||
42e30bf3 VY |
3091 | /* Section 4.2.2 |
3092 | * If the address 0.0.0.0 or ::0 is provided, all | |
3093 | * addresses of the peer except the source address of the | |
3094 | * packet MUST be deleted. | |
3095 | */ | |
3096 | if (af->is_any(&addr)) { | |
3097 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3098 | sctp_assoc_del_nonprimary_peers(asoc, | |
3099 | asconf->transport); | |
7c5a9461 | 3100 | return SCTP_ERROR_NO_ERROR; |
3101 | } | |
3102 | ||
3103 | /* If the address is not part of the association, the | |
3104 | * ASCONF-ACK with Error Cause Indication Parameter | |
3105 | * which including cause of Unresolvable Address should | |
3106 | * be sent. | |
3107 | */ | |
3108 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3109 | if (!peer) | |
3110 | return SCTP_ERROR_DNS_FAILED; | |
3111 | ||
3112 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3113 | break; |
3114 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3115 | /* ADDIP Section 4.2.4 |
3116 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3117 | * MAY mark the source address of the packet as its | |
3118 | * primary. | |
3119 | */ | |
3120 | if (af->is_any(&addr)) | |
3121 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3122 | ||
dd86d136 | 3123 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3124 | if (!peer) |
945e5abc | 3125 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3126 | |
3127 | sctp_assoc_set_primary(asoc, peer); | |
3128 | break; | |
1da177e4 LT |
3129 | } |
3130 | ||
3131 | return SCTP_ERROR_NO_ERROR; | |
3132 | } | |
3133 | ||
9de7922b DB |
3134 | /* Verify the ASCONF packet before we process it. */ |
3135 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3136 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3137 | struct sctp_paramhdr **errp) | |
3138 | { | |
68d75469 | 3139 | struct sctp_addip_chunk *addip; |
9de7922b | 3140 | bool addr_param_seen = false; |
327c0dab | 3141 | union sctp_params param; |
6f4c618d | 3142 | |
68d75469 | 3143 | addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; |
9de7922b DB |
3144 | sctp_walk_params(param, addip, addip_hdr.params) { |
3145 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3146 | |
9de7922b | 3147 | *errp = param.p; |
6f4c618d | 3148 | switch (param.p->type) { |
9de7922b DB |
3149 | case SCTP_PARAM_ERR_CAUSE: |
3150 | break; | |
3151 | case SCTP_PARAM_IPV4_ADDRESS: | |
a38905e6 | 3152 | if (length != sizeof(struct sctp_ipv4addr_param)) |
9de7922b | 3153 | return false; |
ce7b4ccc | 3154 | /* ensure there is only one addr param and it's in the |
3155 | * beginning of addip_hdr params, or we reject it. | |
3156 | */ | |
3157 | if (param.v != addip->addip_hdr.params) | |
3158 | return false; | |
9de7922b DB |
3159 | addr_param_seen = true; |
3160 | break; | |
3161 | case SCTP_PARAM_IPV6_ADDRESS: | |
00987cc0 | 3162 | if (length != sizeof(struct sctp_ipv6addr_param)) |
9de7922b | 3163 | return false; |
ce7b4ccc | 3164 | if (param.v != addip->addip_hdr.params) |
3165 | return false; | |
9de7922b DB |
3166 | addr_param_seen = true; |
3167 | break; | |
6f4c618d WY |
3168 | case SCTP_PARAM_ADD_IP: |
3169 | case SCTP_PARAM_DEL_IP: | |
3170 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3171 | /* In ASCONF chunks, these need to be first. */ |
3172 | if (addr_param_needed && !addr_param_seen) | |
3173 | return false; | |
3174 | length = ntohs(param.addip->param_hdr.length); | |
8b32f234 | 3175 | if (length < sizeof(struct sctp_addip_param) + |
3c918704 | 3176 | sizeof(**errp)) |
9de7922b | 3177 | return false; |
6f4c618d WY |
3178 | break; |
3179 | case SCTP_PARAM_SUCCESS_REPORT: | |
3180 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
8b32f234 | 3181 | if (length != sizeof(struct sctp_addip_param)) |
9de7922b | 3182 | return false; |
6f4c618d WY |
3183 | break; |
3184 | default: | |
9de7922b DB |
3185 | /* This is unkown to us, reject! */ |
3186 | return false; | |
6f4c618d | 3187 | } |
6f4c618d WY |
3188 | } |
3189 | ||
9de7922b DB |
3190 | /* Remaining sanity checks. */ |
3191 | if (addr_param_needed && !addr_param_seen) | |
3192 | return false; | |
3193 | if (!addr_param_needed && addr_param_seen) | |
3194 | return false; | |
3195 | if (param.v != chunk->chunk_end) | |
3196 | return false; | |
6f4c618d | 3197 | |
9de7922b | 3198 | return true; |
6f4c618d WY |
3199 | } |
3200 | ||
d808ad9a | 3201 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3202 | * return an ASCONF_ACK chunk to be sent in response. |
3203 | */ | |
3204 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3205 | struct sctp_chunk *asconf) | |
3206 | { | |
327c0dab | 3207 | union sctp_addr_param *addr_param; |
68d75469 | 3208 | struct sctp_addip_chunk *addip; |
327c0dab | 3209 | struct sctp_chunk *asconf_ack; |
9de7922b | 3210 | bool all_param_pass = true; |
327c0dab XL |
3211 | struct sctp_addiphdr *hdr; |
3212 | int length = 0, chunk_len; | |
9de7922b | 3213 | union sctp_params param; |
327c0dab XL |
3214 | __be16 err_code; |
3215 | __u32 serial; | |
1da177e4 | 3216 | |
68d75469 | 3217 | addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; |
922dbc5b XL |
3218 | chunk_len = ntohs(asconf->chunk_hdr->length) - |
3219 | sizeof(struct sctp_chunkhdr); | |
65205cc4 | 3220 | hdr = (struct sctp_addiphdr *)asconf->skb->data; |
1da177e4 LT |
3221 | serial = ntohl(hdr->serial); |
3222 | ||
d808ad9a | 3223 | /* Skip the addiphdr and store a pointer to address parameter. */ |
65205cc4 | 3224 | length = sizeof(*hdr); |
1da177e4 LT |
3225 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3226 | chunk_len -= length; | |
3227 | ||
3228 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3229 | * asconf parameter. |
d808ad9a | 3230 | */ |
6a435732 | 3231 | length = ntohs(addr_param->p.length); |
1da177e4 LT |
3232 | chunk_len -= length; |
3233 | ||
d808ad9a | 3234 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3235 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3236 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3237 | * parameters. |
1da177e4 | 3238 | */ |
2cab86be | 3239 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3240 | if (!asconf_ack) |
3241 | goto done; | |
3242 | ||
3243 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3244 | sctp_walk_params(param, addip, addip_hdr.params) { |
3245 | /* Skip preceeding address parameters. */ | |
3246 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3247 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3248 | continue; | |
3249 | ||
1da177e4 | 3250 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3251 | param.addip); |
1da177e4 LT |
3252 | /* ADDIP 4.1 A7) |
3253 | * If an error response is received for a TLV parameter, | |
3254 | * all TLVs with no response before the failed TLV are | |
3255 | * considered successful if not reported. All TLVs after | |
3256 | * the failed response are considered unsuccessful unless | |
3257 | * a specific success indication is present for the parameter. | |
3258 | */ | |
9de7922b DB |
3259 | if (err_code != SCTP_ERROR_NO_ERROR) |
3260 | all_param_pass = false; | |
1da177e4 | 3261 | if (!all_param_pass) |
9de7922b DB |
3262 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3263 | err_code, param.addip); | |
1da177e4 LT |
3264 | |
3265 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3266 | * an IP address sends an 'Out of Resource' in its response, it | |
3267 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3268 | * in the ASCONF. |
1da177e4 | 3269 | */ |
9de7922b | 3270 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3271 | goto done; |
1da177e4 | 3272 | } |
1da177e4 LT |
3273 | done: |
3274 | asoc->peer.addip_serial++; | |
3275 | ||
3276 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3277 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3278 | */ |
3279 | if (asconf_ack) { | |
1da177e4 | 3280 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3281 | list_add_tail(&asconf_ack->transmitted_list, |
3282 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3283 | } |
3284 | ||
3285 | return asconf_ack; | |
3286 | } | |
3287 | ||
3288 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3289 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
8b32f234 | 3290 | struct sctp_addip_param *asconf_param) |
1da177e4 | 3291 | { |
1da177e4 LT |
3292 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
3293 | union sctp_addr_param *addr_param; | |
dc022a98 | 3294 | struct sctp_sockaddr_entry *saddr; |
327c0dab XL |
3295 | struct sctp_transport *transport; |
3296 | union sctp_addr addr; | |
3297 | struct sctp_af *af; | |
1da177e4 | 3298 | |
8b32f234 | 3299 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
1da177e4 LT |
3300 | |
3301 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3302 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3303 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3304 | |
3305 | switch (asconf_param->param_hdr.type) { | |
3306 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3307 | /* This is always done in BH context with a socket lock |
3308 | * held, so the list can not change. | |
3309 | */ | |
0ed90fb0 | 3310 | local_bh_disable(); |
559cf710 | 3311 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3312 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3313 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3314 | } |
0ed90fb0 | 3315 | local_bh_enable(); |
3cd9749c WY |
3316 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3317 | transports) { | |
c86a773c | 3318 | sctp_transport_dst_release(transport); |
3cd9749c | 3319 | } |
1da177e4 LT |
3320 | break; |
3321 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3322 | local_bh_disable(); |
425e0f68 | 3323 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3324 | if (asoc->asconf_addr_del_pending != NULL && |
3325 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3326 | kfree(asoc->asconf_addr_del_pending); | |
3327 | asoc->asconf_addr_del_pending = NULL; | |
3328 | } | |
0ed90fb0 | 3329 | local_bh_enable(); |
9dbc15f0 RD |
3330 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3331 | transports) { | |
c86a773c | 3332 | sctp_transport_dst_release(transport); |
1da177e4 LT |
3333 | } |
3334 | break; | |
3335 | default: | |
3336 | break; | |
3337 | } | |
1da177e4 LT |
3338 | } |
3339 | ||
3340 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3341 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3342 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3343 | * ADDIP 4.1 |
3344 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3345 | * response before the failed TLV are considered successful if not reported. | |
3346 | * All TLVs after the failed response are considered unsuccessful unless a | |
3347 | * specific success indication is present for the parameter. | |
3348 | */ | |
dbc16db1 | 3349 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
8b32f234 XL |
3350 | struct sctp_addip_param *asconf_param, |
3351 | int no_err) | |
1da177e4 | 3352 | { |
8b32f234 | 3353 | struct sctp_addip_param *asconf_ack_param; |
327c0dab XL |
3354 | struct sctp_errhdr *err_param; |
3355 | int asconf_ack_len; | |
3356 | __be16 err_code; | |
3357 | int length; | |
1da177e4 LT |
3358 | |
3359 | if (no_err) | |
3360 | err_code = SCTP_ERROR_NO_ERROR; | |
3361 | else | |
3362 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3363 | ||
f3830ccc | 3364 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
922dbc5b | 3365 | sizeof(struct sctp_chunkhdr); |
f3830ccc | 3366 | |
1da177e4 LT |
3367 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3368 | * the first asconf_ack parameter. | |
d808ad9a | 3369 | */ |
65205cc4 | 3370 | length = sizeof(struct sctp_addiphdr); |
8b32f234 XL |
3371 | asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + |
3372 | length); | |
1da177e4 LT |
3373 | asconf_ack_len -= length; |
3374 | ||
3375 | while (asconf_ack_len > 0) { | |
3376 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3377 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3378 | case SCTP_PARAM_SUCCESS_REPORT: |
3379 | return SCTP_ERROR_NO_ERROR; | |
3380 | case SCTP_PARAM_ERR_CAUSE: | |
8b32f234 | 3381 | length = sizeof(*asconf_ack_param); |
ea110733 | 3382 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3383 | asconf_ack_len -= length; |
3384 | if (asconf_ack_len > 0) | |
3385 | return err_param->cause; | |
3386 | else | |
3387 | return SCTP_ERROR_INV_PARAM; | |
3388 | break; | |
3389 | default: | |
3390 | return SCTP_ERROR_INV_PARAM; | |
3391 | } | |
3392 | } | |
3393 | ||
3394 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3395 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3396 | asconf_ack_len -= length; |
3397 | } | |
3398 | ||
3399 | return err_code; | |
3400 | } | |
3401 | ||
3402 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3403 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3404 | struct sctp_chunk *asconf_ack) | |
3405 | { | |
327c0dab XL |
3406 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
3407 | struct sctp_addip_param *asconf_param; | |
3408 | __be16 err_code = SCTP_ERROR_NO_ERROR; | |
3409 | union sctp_addr_param *addr_param; | |
3410 | int asconf_len = asconf->skb->len; | |
3411 | int all_param_pass = 0; | |
3412 | int length = 0; | |
3413 | int no_err = 1; | |
3414 | int retval = 0; | |
1da177e4 LT |
3415 | |
3416 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3417 | * a pointer to address parameter. | |
d808ad9a | 3418 | */ |
68d75469 | 3419 | length = sizeof(struct sctp_addip_chunk); |
1da177e4 LT |
3420 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3421 | asconf_len -= length; | |
3422 | ||
3423 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3424 | * pointer to the first asconf parameter. |
d808ad9a | 3425 | */ |
6a435732 | 3426 | length = ntohs(addr_param->p.length); |
ea110733 | 3427 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3428 | asconf_len -= length; |
3429 | ||
3430 | /* ADDIP 4.1 | |
3431 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3432 | * failures are indicated, then all request(s) are considered | |
3433 | * successful. | |
3434 | */ | |
65205cc4 | 3435 | if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) |
1da177e4 LT |
3436 | all_param_pass = 1; |
3437 | ||
3438 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3439 | while (asconf_len > 0) { | |
3440 | if (all_param_pass) | |
3441 | err_code = SCTP_ERROR_NO_ERROR; | |
3442 | else { | |
3443 | err_code = sctp_get_asconf_response(asconf_ack, | |
3444 | asconf_param, | |
3445 | no_err); | |
3446 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3447 | no_err = 0; | |
3448 | } | |
3449 | ||
3450 | switch (err_code) { | |
3451 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3452 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3453 | break; |
3454 | ||
3455 | case SCTP_ERROR_RSRC_LOW: | |
3456 | retval = 1; | |
3457 | break; | |
3458 | ||
a987f762 | 3459 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3460 | /* Disable sending this type of asconf parameter in |
3461 | * future. | |
d808ad9a | 3462 | */ |
1da177e4 LT |
3463 | asoc->peer.addip_disabled_mask |= |
3464 | asconf_param->param_hdr.type; | |
3465 | break; | |
3466 | ||
3467 | case SCTP_ERROR_REQ_REFUSED: | |
3468 | case SCTP_ERROR_DEL_LAST_IP: | |
3469 | case SCTP_ERROR_DEL_SRC_IP: | |
3470 | default: | |
3471 | break; | |
3472 | } | |
3473 | ||
3474 | /* Skip the processed asconf parameter and move to the next | |
3475 | * one. | |
d808ad9a | 3476 | */ |
1da177e4 | 3477 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3478 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3479 | asconf_len -= length; |
3480 | } | |
3481 | ||
ddc4bbee | 3482 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3483 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3484 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3485 | } | |
8a07eb0a | 3486 | |
1da177e4 | 3487 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3488 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3489 | sctp_chunk_free(asconf); |
3490 | asoc->addip_last_asconf = NULL; | |
3491 | ||
1da177e4 LT |
3492 | return retval; |
3493 | } | |
3494 | ||
d808ad9a | 3495 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3496 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3497 | __u32 new_cum_tsn, size_t nstreams, | |
3498 | struct sctp_fwdtsn_skip *skiplist) | |
3499 | { | |
3500 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3501 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3502 | struct sctp_fwdtsn_skip skip; |
3503 | size_t hint; | |
3504 | int i; | |
3505 | ||
3506 | hint = (nstreams + 1) * sizeof(__u32); | |
3507 | ||
cea8768f | 3508 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3509 | |
3510 | if (!retval) | |
3511 | return NULL; | |
3512 | ||
1da177e4 LT |
3513 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3514 | retval->subh.fwdtsn_hdr = | |
3515 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3516 | ||
3517 | for (i = 0; i < nstreams; i++) { | |
3518 | skip.stream = skiplist[i].stream; | |
3519 | skip.ssn = skiplist[i].ssn; | |
3520 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3521 | } | |
3522 | ||
3523 | return retval; | |
3524 | } | |
cc16f00f XL |
3525 | |
3526 | /* RE-CONFIG 3.1 (RE-CONFIG chunk) | |
3527 | * 0 1 2 3 | |
3528 | * 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 | |
3529 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3530 | * | Type = 130 | Chunk Flags | Chunk Length | | |
3531 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3532 | * \ \ | |
3533 | * / Re-configuration Parameter / | |
3534 | * \ \ | |
3535 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3536 | * \ \ | |
3537 | * / Re-configuration Parameter (optional) / | |
3538 | * \ \ | |
3539 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3540 | */ | |
327c0dab XL |
3541 | static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, |
3542 | int length) | |
cc16f00f XL |
3543 | { |
3544 | struct sctp_reconf_chunk *reconf; | |
3545 | struct sctp_chunk *retval; | |
3546 | ||
3547 | retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, | |
3548 | GFP_ATOMIC); | |
3549 | if (!retval) | |
3550 | return NULL; | |
3551 | ||
3552 | reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; | |
3553 | retval->param_hdr.v = reconf->params; | |
3554 | ||
3555 | return retval; | |
3556 | } | |
3557 | ||
3558 | /* RE-CONFIG 4.1 (STREAM OUT RESET) | |
3559 | * 0 1 2 3 | |
3560 | * 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 | |
3561 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3562 | * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | | |
3563 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3564 | * | Re-configuration Request Sequence Number | | |
3565 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3566 | * | Re-configuration Response Sequence Number | | |
3567 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3568 | * | Sender's Last Assigned TSN | | |
3569 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3570 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3571 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3572 | * / ...... / | |
3573 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3574 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3575 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3576 | * | |
3577 | * RE-CONFIG 4.2 (STREAM IN RESET) | |
3578 | * 0 1 2 3 | |
3579 | * 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 | |
3580 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3581 | * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | | |
3582 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3583 | * | Re-configuration Request Sequence Number | | |
3584 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3585 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3586 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3587 | * / ...... / | |
3588 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3589 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3590 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3591 | */ | |
3592 | struct sctp_chunk *sctp_make_strreset_req( | |
327c0dab | 3593 | const struct sctp_association *asoc, |
1da4fc97 | 3594 | __u16 stream_num, __be16 *stream_list, |
327c0dab | 3595 | bool out, bool in) |
cc16f00f | 3596 | { |
423852f8 | 3597 | __u16 stream_len = stream_num * sizeof(__u16); |
cc16f00f | 3598 | struct sctp_strreset_outreq outreq; |
cc16f00f XL |
3599 | struct sctp_strreset_inreq inreq; |
3600 | struct sctp_chunk *retval; | |
16e1a919 | 3601 | __u16 outlen, inlen; |
cc16f00f XL |
3602 | |
3603 | outlen = (sizeof(outreq) + stream_len) * out; | |
3604 | inlen = (sizeof(inreq) + stream_len) * in; | |
3605 | ||
3606 | retval = sctp_make_reconf(asoc, outlen + inlen); | |
3607 | if (!retval) | |
3608 | return NULL; | |
3609 | ||
cc16f00f XL |
3610 | if (outlen) { |
3611 | outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; | |
3612 | outreq.param_hdr.length = htons(outlen); | |
3613 | outreq.request_seq = htonl(asoc->strreset_outseq); | |
3614 | outreq.response_seq = htonl(asoc->strreset_inseq - 1); | |
3615 | outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); | |
3616 | ||
3617 | sctp_addto_chunk(retval, sizeof(outreq), &outreq); | |
3618 | ||
3619 | if (stream_len) | |
3620 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3621 | } | |
3622 | ||
3623 | if (inlen) { | |
3624 | inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; | |
3625 | inreq.param_hdr.length = htons(inlen); | |
3626 | inreq.request_seq = htonl(asoc->strreset_outseq + out); | |
3627 | ||
3628 | sctp_addto_chunk(retval, sizeof(inreq), &inreq); | |
3629 | ||
3630 | if (stream_len) | |
3631 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3632 | } | |
3633 | ||
cc16f00f XL |
3634 | return retval; |
3635 | } | |
c56480a1 XL |
3636 | |
3637 | /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) | |
3638 | * 0 1 2 3 | |
3639 | * 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 | |
3640 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3641 | * | Parameter Type = 15 | Parameter Length = 8 | | |
3642 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3643 | * | Re-configuration Request Sequence Number | | |
3644 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3645 | */ | |
3646 | struct sctp_chunk *sctp_make_strreset_tsnreq( | |
327c0dab | 3647 | const struct sctp_association *asoc) |
c56480a1 XL |
3648 | { |
3649 | struct sctp_strreset_tsnreq tsnreq; | |
3650 | __u16 length = sizeof(tsnreq); | |
3651 | struct sctp_chunk *retval; | |
3652 | ||
3653 | retval = sctp_make_reconf(asoc, length); | |
3654 | if (!retval) | |
3655 | return NULL; | |
3656 | ||
3657 | tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; | |
3658 | tsnreq.param_hdr.length = htons(length); | |
3659 | tsnreq.request_seq = htonl(asoc->strreset_outseq); | |
3660 | ||
3661 | sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); | |
3662 | ||
3663 | return retval; | |
3664 | } | |
78098117 XL |
3665 | |
3666 | /* RE-CONFIG 4.5/4.6 (ADD STREAM) | |
3667 | * 0 1 2 3 | |
3668 | * 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 | |
3669 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3670 | * | Parameter Type = 17 | Parameter Length = 12 | | |
3671 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3672 | * | Re-configuration Request Sequence Number | | |
3673 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3674 | * | Number of new streams | Reserved | | |
3675 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3676 | */ | |
3677 | struct sctp_chunk *sctp_make_strreset_addstrm( | |
327c0dab XL |
3678 | const struct sctp_association *asoc, |
3679 | __u16 out, __u16 in) | |
78098117 XL |
3680 | { |
3681 | struct sctp_strreset_addstrm addstrm; | |
3682 | __u16 size = sizeof(addstrm); | |
3683 | struct sctp_chunk *retval; | |
3684 | ||
3685 | retval = sctp_make_reconf(asoc, (!!out + !!in) * size); | |
3686 | if (!retval) | |
3687 | return NULL; | |
3688 | ||
3689 | if (out) { | |
3690 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; | |
3691 | addstrm.param_hdr.length = htons(size); | |
3692 | addstrm.number_of_streams = htons(out); | |
3693 | addstrm.request_seq = htonl(asoc->strreset_outseq); | |
3694 | addstrm.reserved = 0; | |
3695 | ||
3696 | sctp_addto_chunk(retval, size, &addstrm); | |
3697 | } | |
3698 | ||
3699 | if (in) { | |
3700 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; | |
3701 | addstrm.param_hdr.length = htons(size); | |
3702 | addstrm.number_of_streams = htons(in); | |
3703 | addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); | |
3704 | addstrm.reserved = 0; | |
3705 | ||
3706 | sctp_addto_chunk(retval, size, &addstrm); | |
3707 | } | |
3708 | ||
3709 | return retval; | |
3710 | } | |
bd4b9f8b XL |
3711 | |
3712 | /* RE-CONFIG 4.4 (RESP) | |
3713 | * 0 1 2 3 | |
3714 | * 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 | |
3715 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3716 | * | Parameter Type = 16 | Parameter Length | | |
3717 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3718 | * | Re-configuration Response Sequence Number | | |
3719 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3720 | * | Result | | |
3721 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3722 | */ | |
327c0dab XL |
3723 | struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, |
3724 | __u32 result, __u32 sn) | |
bd4b9f8b XL |
3725 | { |
3726 | struct sctp_strreset_resp resp; | |
3727 | __u16 length = sizeof(resp); | |
3728 | struct sctp_chunk *retval; | |
3729 | ||
3730 | retval = sctp_make_reconf(asoc, length); | |
3731 | if (!retval) | |
3732 | return NULL; | |
3733 | ||
3734 | resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3735 | resp.param_hdr.length = htons(length); | |
3736 | resp.response_seq = htonl(sn); | |
3737 | resp.result = htonl(result); | |
3738 | ||
3739 | sctp_addto_chunk(retval, sizeof(resp), &resp); | |
3740 | ||
3741 | return retval; | |
3742 | } | |
3743 | ||
3744 | /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) | |
3745 | * 0 1 2 3 | |
3746 | * 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 | |
3747 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3748 | * | Parameter Type = 16 | Parameter Length | | |
3749 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3750 | * | Re-configuration Response Sequence Number | | |
3751 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3752 | * | Result | | |
3753 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3754 | * | Sender's Next TSN (optional) | | |
3755 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3756 | * | Receiver's Next TSN (optional) | | |
3757 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3758 | */ | |
327c0dab XL |
3759 | struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, |
3760 | __u32 result, __u32 sn, | |
3761 | __u32 sender_tsn, | |
3762 | __u32 receiver_tsn) | |
bd4b9f8b XL |
3763 | { |
3764 | struct sctp_strreset_resptsn tsnresp; | |
3765 | __u16 length = sizeof(tsnresp); | |
3766 | struct sctp_chunk *retval; | |
3767 | ||
3768 | retval = sctp_make_reconf(asoc, length); | |
3769 | if (!retval) | |
3770 | return NULL; | |
3771 | ||
3772 | tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3773 | tsnresp.param_hdr.length = htons(length); | |
3774 | ||
3775 | tsnresp.response_seq = htonl(sn); | |
3776 | tsnresp.result = htonl(result); | |
3777 | tsnresp.senders_next_tsn = htonl(sender_tsn); | |
3778 | tsnresp.receivers_next_tsn = htonl(receiver_tsn); | |
3779 | ||
3780 | sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); | |
3781 | ||
3782 | return retval; | |
3783 | } | |
ea625043 XL |
3784 | |
3785 | bool sctp_verify_reconf(const struct sctp_association *asoc, | |
3786 | struct sctp_chunk *chunk, | |
3787 | struct sctp_paramhdr **errp) | |
3788 | { | |
3789 | struct sctp_reconf_chunk *hdr; | |
3790 | union sctp_params param; | |
1da4fc97 XL |
3791 | __be16 last = 0; |
3792 | __u16 cnt = 0; | |
ea625043 XL |
3793 | |
3794 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3795 | sctp_walk_params(param, hdr, params) { | |
3796 | __u16 length = ntohs(param.p->length); | |
3797 | ||
3798 | *errp = param.p; | |
3799 | if (cnt++ > 2) | |
3800 | return false; | |
3801 | switch (param.p->type) { | |
3802 | case SCTP_PARAM_RESET_OUT_REQUEST: | |
3803 | if (length < sizeof(struct sctp_strreset_outreq) || | |
3804 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3805 | last != SCTP_PARAM_RESET_IN_REQUEST)) | |
3806 | return false; | |
3807 | break; | |
3808 | case SCTP_PARAM_RESET_IN_REQUEST: | |
3809 | if (length < sizeof(struct sctp_strreset_inreq) || | |
3810 | (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3811 | return false; | |
3812 | break; | |
3813 | case SCTP_PARAM_RESET_RESPONSE: | |
3814 | if ((length != sizeof(struct sctp_strreset_resp) && | |
3815 | length != sizeof(struct sctp_strreset_resptsn)) || | |
3816 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3817 | last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3818 | return false; | |
3819 | break; | |
3820 | case SCTP_PARAM_RESET_TSN_REQUEST: | |
3821 | if (length != | |
3822 | sizeof(struct sctp_strreset_tsnreq) || last) | |
3823 | return false; | |
3824 | break; | |
3825 | case SCTP_PARAM_RESET_ADD_IN_STREAMS: | |
3826 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3827 | (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) | |
3828 | return false; | |
3829 | break; | |
3830 | case SCTP_PARAM_RESET_ADD_OUT_STREAMS: | |
3831 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3832 | (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) | |
3833 | return false; | |
3834 | break; | |
3835 | default: | |
3836 | return false; | |
3837 | } | |
3838 | ||
3839 | last = param.p->type; | |
3840 | } | |
3841 | ||
3842 | return true; | |
3843 | } |