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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement the state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * C. Robin <chris@hundredacre.ac.uk> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Xingang Guo <xingang.guo@intel.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Sridhar Samudrala <sri@us.ibm.com> | |
41 | * Daisy Chang <daisyc@us.ibm.com> | |
42 | * Ardelle Fan <ardelle.fan@intel.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
5821c769 | 48 | #include <crypto/hash.h> |
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/kernel.h> | |
51 | #include <linux/ip.h> | |
52 | #include <linux/ipv6.h> | |
53 | #include <linux/net.h> | |
54 | #include <linux/inet.h> | |
ebc3bbcf | 55 | #include <linux/scatterlist.h> |
5a0e3ad6 | 56 | #include <linux/slab.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | #include <linux/random.h> /* for get_random_bytes */ | |
61 | #include <net/sctp/sctp.h> | |
62 | #include <net/sctp/sm.h> | |
63 | ||
072017b4 | 64 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
65 | __u8 type, __u8 flags, int paylen, |
66 | gfp_t gfp); | |
072017b4 | 67 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 68 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 69 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
70 | __u8 type, __u8 flags, int paylen, |
71 | gfp_t gfp); | |
1da177e4 LT |
72 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
73 | const struct sctp_association *asoc, | |
74 | const struct sctp_chunk *init_chunk, | |
75 | int *cookie_len, | |
76 | const __u8 *raw_addrs, int addrs_len); | |
77 | static int sctp_process_param(struct sctp_association *asoc, | |
78 | union sctp_params param, | |
79 | const union sctp_addr *peer_addr, | |
dd0fc66f | 80 | gfp_t gfp); |
8ee4be37 VY |
81 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
82 | const void *data); | |
6daaf0de | 83 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, |
84 | const void *data); | |
1da177e4 | 85 | |
072017b4 VY |
86 | /* Control chunk destructor */ |
87 | static void sctp_control_release_owner(struct sk_buff *skb) | |
88 | { | |
89 | /*TODO: do memory release */ | |
90 | } | |
91 | ||
92 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
93 | { | |
94 | struct sctp_association *asoc = chunk->asoc; | |
95 | struct sk_buff *skb = chunk->skb; | |
96 | ||
97 | /* TODO: properly account for control chunks. | |
98 | * To do it right we'll need: | |
99 | * 1) endpoint if association isn't known. | |
100 | * 2) proper memory accounting. | |
101 | * | |
102 | * For now don't do anything for now. | |
103 | */ | |
104 | skb->sk = asoc ? asoc->base.sk : NULL; | |
105 | skb->destructor = sctp_control_release_owner; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* What was the inbound interface for this chunk? */ |
109 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
110 | { | |
e7487c86 | 111 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 112 | |
e7487c86 | 113 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
114 | } |
115 | ||
116 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
117 | * | |
118 | * Note 2: The ECN capable field is reserved for future use of | |
119 | * Explicit Congestion Notification. | |
120 | */ | |
121 | static const struct sctp_paramhdr ecap_param = { | |
122 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 123 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
124 | }; |
125 | static const struct sctp_paramhdr prsctp_param = { | |
126 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 127 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
128 | }; |
129 | ||
5fa782c2 | 130 | /* A helper to initialize an op error inside a |
1da177e4 LT |
131 | * provided chunk, as most cause codes will be embedded inside an |
132 | * abort chunk. | |
133 | */ | |
5bf2db03 | 134 | void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
00f1c2df | 135 | size_t paylen) |
1da177e4 LT |
136 | { |
137 | sctp_errhdr_t err; | |
1da177e4 LT |
138 | __u16 len; |
139 | ||
d808ad9a | 140 | /* Cause code constants are now defined in network order. */ |
1da177e4 LT |
141 | err.cause = cause_code; |
142 | len = sizeof(sctp_errhdr_t) + paylen; | |
1da177e4 | 143 | err.length = htons(len); |
4a1c0107 | 144 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); |
1da177e4 LT |
145 | } |
146 | ||
5fa782c2 NH |
147 | /* A helper to initialize an op error inside a |
148 | * provided chunk, as most cause codes will be embedded inside an | |
149 | * abort chunk. Differs from sctp_init_cause in that it won't oops | |
150 | * if there isn't enough space in the op error chunk | |
151 | */ | |
db28aafa | 152 | static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, |
5fa782c2 NH |
153 | size_t paylen) |
154 | { | |
155 | sctp_errhdr_t err; | |
156 | __u16 len; | |
157 | ||
158 | /* Cause code constants are now defined in network order. */ | |
159 | err.cause = cause_code; | |
160 | len = sizeof(sctp_errhdr_t) + paylen; | |
161 | err.length = htons(len); | |
162 | ||
2e3219b5 | 163 | if (skb_tailroom(chunk->skb) < len) |
5fa782c2 NH |
164 | return -ENOSPC; |
165 | chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, | |
166 | sizeof(sctp_errhdr_t), | |
167 | &err); | |
168 | return 0; | |
169 | } | |
1da177e4 LT |
170 | /* 3.3.2 Initiation (INIT) (1) |
171 | * | |
172 | * This chunk is used to initiate a SCTP association between two | |
173 | * endpoints. The format of the INIT chunk is shown below: | |
174 | * | |
175 | * 0 1 2 3 | |
176 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
177 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
178 | * | Type = 1 | Chunk Flags | Chunk Length | | |
179 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
180 | * | Initiate Tag | | |
181 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
182 | * | Advertised Receiver Window Credit (a_rwnd) | | |
183 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
184 | * | Number of Outbound Streams | Number of Inbound Streams | | |
185 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
186 | * | Initial TSN | | |
187 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
188 | * \ \ | |
189 | * / Optional/Variable-Length Parameters / | |
190 | * \ \ | |
191 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
192 | * | |
193 | * | |
194 | * The INIT chunk contains the following parameters. Unless otherwise | |
195 | * noted, each parameter MUST only be included once in the INIT chunk. | |
196 | * | |
197 | * Fixed Parameters Status | |
198 | * ---------------------------------------------- | |
199 | * Initiate Tag Mandatory | |
200 | * Advertised Receiver Window Credit Mandatory | |
201 | * Number of Outbound Streams Mandatory | |
202 | * Number of Inbound Streams Mandatory | |
203 | * Initial TSN Mandatory | |
204 | * | |
205 | * Variable Parameters Status Type Value | |
206 | * ------------------------------------------------------------- | |
207 | * IPv4 Address (Note 1) Optional 5 | |
208 | * IPv6 Address (Note 1) Optional 6 | |
209 | * Cookie Preservative Optional 9 | |
210 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
211 | * Host Name Address (Note 3) Optional 11 | |
212 | * Supported Address Types (Note 4) Optional 12 | |
213 | */ | |
214 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
215 | const struct sctp_bind_addr *bp, | |
dd0fc66f | 216 | gfp_t gfp, int vparam_len) |
1da177e4 | 217 | { |
e1fc3b14 | 218 | struct net *net = sock_net(asoc->base.sk); |
b14878cc | 219 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
220 | sctp_inithdr_t init; |
221 | union sctp_params addrs; | |
222 | size_t chunksize; | |
223 | struct sctp_chunk *retval = NULL; | |
224 | int num_types, addrs_len = 0; | |
225 | struct sctp_sock *sp; | |
226 | sctp_supported_addrs_param_t sat; | |
3dbe8656 | 227 | __be16 types[2]; |
0f3fffd8 | 228 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
229 | sctp_supported_ext_param_t ext_param; |
230 | int num_ext = 0; | |
231 | __u8 extensions[3]; | |
730fc3d0 VY |
232 | sctp_paramhdr_t *auth_chunks = NULL, |
233 | *auth_hmacs = NULL; | |
1da177e4 LT |
234 | |
235 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
236 | * | |
237 | * Note 1: The INIT chunks can contain multiple addresses that | |
238 | * can be IPv4 and/or IPv6 in any combination. | |
239 | */ | |
240 | retval = NULL; | |
241 | ||
242 | /* Convert the provided bind address list to raw format. */ | |
243 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
244 | ||
245 | init.init_tag = htonl(asoc->c.my_vtag); | |
246 | init.a_rwnd = htonl(asoc->rwnd); | |
247 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
248 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
249 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
250 | ||
251 | /* How many address types are needed? */ | |
252 | sp = sctp_sk(asoc->base.sk); | |
253 | num_types = sp->pf->supported_addrs(sp, types); | |
254 | ||
a8170c35 WY |
255 | chunksize = sizeof(init) + addrs_len; |
256 | chunksize += WORD_ROUND(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 | ||
6fc791ee | 273 | if (sp->adaptation_ind) |
274 | chunksize += sizeof(aiparam); | |
275 | ||
1da177e4 LT |
276 | chunksize += vparam_len; |
277 | ||
730fc3d0 | 278 | /* Account for AUTH related parameters */ |
b14878cc | 279 | if (ep->auth_enable) { |
730fc3d0 VY |
280 | /* Add random parameter length*/ |
281 | chunksize += sizeof(asoc->c.auth_random); | |
282 | ||
283 | /* Add HMACS parameter length if any were defined */ | |
284 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
285 | if (auth_hmacs->length) | |
a8170c35 | 286 | chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
287 | else |
288 | auth_hmacs = NULL; | |
289 | ||
290 | /* Add CHUNKS parameter length */ | |
291 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
292 | if (auth_chunks->length) | |
a8170c35 | 293 | chunksize += WORD_ROUND(ntohs(auth_chunks->length)); |
730fc3d0 | 294 | else |
9baffaa6 | 295 | auth_chunks = NULL; |
730fc3d0 VY |
296 | |
297 | extensions[num_ext] = SCTP_CID_AUTH; | |
298 | num_ext += 1; | |
299 | } | |
300 | ||
131a47e3 VY |
301 | /* If we have any extensions to report, account for that */ |
302 | if (num_ext) | |
a8170c35 WY |
303 | chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + |
304 | num_ext); | |
131a47e3 | 305 | |
1da177e4 LT |
306 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
307 | * | |
308 | * Note 3: An INIT chunk MUST NOT contain more than one Host | |
309 | * Name address parameter. Moreover, the sender of the INIT | |
310 | * MUST NOT combine any other address types with the Host Name | |
311 | * address in the INIT. The receiver of INIT MUST ignore any | |
312 | * other address types if the Host Name address parameter is | |
313 | * present in the received INIT chunk. | |
314 | * | |
315 | * PLEASE DO NOT FIXME [This version does not support Host Name.] | |
316 | */ | |
317 | ||
cea8768f | 318 | retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); |
1da177e4 LT |
319 | if (!retval) |
320 | goto nodata; | |
321 | ||
322 | retval->subh.init_hdr = | |
323 | sctp_addto_chunk(retval, sizeof(init), &init); | |
324 | retval->param_hdr.v = | |
325 | sctp_addto_chunk(retval, addrs_len, addrs.v); | |
326 | ||
327 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
328 | * | |
329 | * Note 4: This parameter, when present, specifies all the | |
330 | * address types the sending endpoint can support. The absence | |
331 | * of this parameter indicates that the sending endpoint can | |
332 | * support any address type. | |
333 | */ | |
334 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; | |
335 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); | |
336 | sctp_addto_chunk(retval, sizeof(sat), &sat); | |
337 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); | |
338 | ||
339 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 | 340 | |
7aa1b54b | 341 | /* Add the supported extensions parameter. Be nice and add this |
131a47e3 VY |
342 | * fist before addiding the parameters for the extensions themselves |
343 | */ | |
344 | if (num_ext) { | |
345 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
346 | ext_param.param_hdr.length = | |
347 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
348 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
349 | &ext_param); | |
8ee4be37 | 350 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
351 | } |
352 | ||
28aa4c26 | 353 | if (asoc->prsctp_enable) |
1da177e4 | 354 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 355 | |
6fc791ee | 356 | if (sp->adaptation_ind) { |
357 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
358 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
359 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
360 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
361 | } | |
131a47e3 | 362 | |
730fc3d0 | 363 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 364 | if (ep->auth_enable) { |
730fc3d0 VY |
365 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
366 | asoc->c.auth_random); | |
367 | if (auth_hmacs) | |
368 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
369 | auth_hmacs); | |
370 | if (auth_chunks) | |
371 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
372 | auth_chunks); | |
373 | } | |
1da177e4 | 374 | nodata: |
a51482bd | 375 | kfree(addrs.v); |
1da177e4 LT |
376 | return retval; |
377 | } | |
378 | ||
379 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
380 | const struct sctp_chunk *chunk, | |
dd0fc66f | 381 | gfp_t gfp, int unkparam_len) |
1da177e4 LT |
382 | { |
383 | sctp_inithdr_t initack; | |
384 | struct sctp_chunk *retval; | |
385 | union sctp_params addrs; | |
6fc791ee | 386 | struct sctp_sock *sp; |
1da177e4 LT |
387 | int addrs_len; |
388 | sctp_cookie_param_t *cookie; | |
389 | int cookie_len; | |
390 | size_t chunksize; | |
0f3fffd8 | 391 | sctp_adaptation_ind_param_t aiparam; |
131a47e3 VY |
392 | sctp_supported_ext_param_t ext_param; |
393 | int num_ext = 0; | |
394 | __u8 extensions[3]; | |
730fc3d0 VY |
395 | sctp_paramhdr_t *auth_chunks = NULL, |
396 | *auth_hmacs = NULL, | |
397 | *auth_random = NULL; | |
1da177e4 LT |
398 | |
399 | retval = NULL; | |
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 | ||
6fc791ee | 437 | if (sp->adaptation_ind) |
438 | chunksize += sizeof(aiparam); | |
1da177e4 | 439 | |
730fc3d0 VY |
440 | if (asoc->peer.auth_capable) { |
441 | auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; | |
442 | chunksize += ntohs(auth_random->length); | |
443 | ||
444 | auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; | |
445 | if (auth_hmacs->length) | |
a8170c35 | 446 | chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
447 | else |
448 | auth_hmacs = NULL; | |
449 | ||
450 | auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; | |
451 | if (auth_chunks->length) | |
a8170c35 | 452 | chunksize += WORD_ROUND(ntohs(auth_chunks->length)); |
730fc3d0 VY |
453 | else |
454 | auth_chunks = NULL; | |
455 | ||
456 | extensions[num_ext] = SCTP_CID_AUTH; | |
457 | num_ext += 1; | |
458 | } | |
459 | ||
8ee4be37 | 460 | if (num_ext) |
a8170c35 WY |
461 | chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + |
462 | num_ext); | |
8ee4be37 | 463 | |
1da177e4 | 464 | /* Now allocate and fill out the chunk. */ |
cea8768f | 465 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
466 | if (!retval) |
467 | goto nomem_chunk; | |
468 | ||
b99a4d53 DC |
469 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
470 | * | |
471 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
472 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
473 | * address from which it received the DATA or control chunk | |
474 | * to which it is replying. | |
475 | * | |
476 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 LT |
477 | */ |
478 | retval->transport = chunk->transport; | |
b99a4d53 | 479 | |
1da177e4 LT |
480 | retval->subh.init_hdr = |
481 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
482 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
483 | sctp_addto_chunk(retval, cookie_len, cookie); | |
484 | if (asoc->peer.ecn_capable) | |
485 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
486 | if (num_ext) { |
487 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
488 | ext_param.param_hdr.length = | |
489 | htons(sizeof(sctp_supported_ext_param_t) + num_ext); | |
490 | sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), | |
491 | &ext_param); | |
8ee4be37 | 492 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 493 | } |
1da177e4 LT |
494 | if (asoc->peer.prsctp_capable) |
495 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
496 | ||
6fc791ee | 497 | if (sp->adaptation_ind) { |
498 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
499 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
500 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
501 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
502 | } | |
1da177e4 | 503 | |
730fc3d0 VY |
504 | if (asoc->peer.auth_capable) { |
505 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
506 | auth_random); | |
507 | if (auth_hmacs) | |
508 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
509 | auth_hmacs); | |
510 | if (auth_chunks) | |
511 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
512 | auth_chunks); | |
513 | } | |
514 | ||
1da177e4 LT |
515 | /* We need to remove the const qualifier at this point. */ |
516 | retval->asoc = (struct sctp_association *) asoc; | |
517 | ||
1da177e4 LT |
518 | nomem_chunk: |
519 | kfree(cookie); | |
520 | nomem_cookie: | |
a51482bd | 521 | kfree(addrs.v); |
1da177e4 LT |
522 | return retval; |
523 | } | |
524 | ||
525 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
526 | * | |
527 | * This chunk is used only during the initialization of an association. | |
528 | * It is sent by the initiator of an association to its peer to complete | |
529 | * the initialization process. This chunk MUST precede any DATA chunk | |
530 | * sent within the association, but MAY be bundled with one or more DATA | |
531 | * chunks in the same packet. | |
532 | * | |
533 | * 0 1 2 3 | |
534 | * 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 | |
535 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
536 | * | Type = 10 |Chunk Flags | Length | | |
537 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
538 | * / Cookie / | |
539 | * \ \ | |
540 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
541 | * | |
542 | * Chunk Flags: 8 bit | |
543 | * | |
544 | * Set to zero on transmit and ignored on receipt. | |
545 | * | |
546 | * Length: 16 bits (unsigned integer) | |
547 | * | |
548 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
549 | * the chunk header and the size of the Cookie. | |
550 | * | |
551 | * Cookie: variable size | |
552 | * | |
553 | * This field must contain the exact cookie received in the | |
554 | * State Cookie parameter from the previous INIT ACK. | |
555 | * | |
556 | * An implementation SHOULD make the cookie as small as possible | |
557 | * to insure interoperability. | |
558 | */ | |
559 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
560 | const struct sctp_chunk *chunk) | |
561 | { | |
562 | struct sctp_chunk *retval; | |
563 | void *cookie; | |
564 | int cookie_len; | |
565 | ||
566 | cookie = asoc->peer.cookie; | |
567 | cookie_len = asoc->peer.cookie_len; | |
568 | ||
569 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
570 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
571 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
572 | if (!retval) |
573 | goto nodata; | |
574 | retval->subh.cookie_hdr = | |
575 | sctp_addto_chunk(retval, cookie_len, cookie); | |
576 | ||
577 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
578 | * | |
579 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
580 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
581 | * address from which it * received the DATA or control chunk | |
582 | * to which it is replying. | |
583 | * | |
584 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
585 | */ | |
586 | if (chunk) | |
587 | retval->transport = chunk->transport; | |
588 | ||
589 | nodata: | |
590 | return retval; | |
591 | } | |
592 | ||
593 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
594 | * | |
595 | * This chunk is used only during the initialization of an | |
596 | * association. It is used to acknowledge the receipt of a COOKIE | |
597 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
598 | * within the association, but MAY be bundled with one or more DATA | |
599 | * chunks or SACK chunk in the same SCTP packet. | |
600 | * | |
601 | * 0 1 2 3 | |
602 | * 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 | |
603 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
604 | * | Type = 11 |Chunk Flags | Length = 4 | | |
605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
606 | * | |
607 | * Chunk Flags: 8 bits | |
608 | * | |
609 | * Set to zero on transmit and ignored on receipt. | |
610 | */ | |
611 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
612 | const struct sctp_chunk *chunk) | |
613 | { | |
614 | struct sctp_chunk *retval; | |
615 | ||
cea8768f | 616 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
617 | |
618 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
619 | * | |
620 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
621 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
622 | * address from which it * received the DATA or control chunk | |
623 | * to which it is replying. | |
624 | * | |
625 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
626 | */ | |
627 | if (retval && chunk) | |
628 | retval->transport = chunk->transport; | |
629 | ||
630 | return retval; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Appendix A: Explicit Congestion Notification: | |
635 | * CWR: | |
636 | * | |
637 | * RFC 2481 details a specific bit for a sender to send in the header of | |
638 | * its next outbound TCP segment to indicate to its peer that it has | |
639 | * reduced its congestion window. This is termed the CWR bit. For | |
640 | * SCTP the same indication is made by including the CWR chunk. | |
641 | * This chunk contains one data element, i.e. the TSN number that | |
642 | * was sent in the ECNE chunk. This element represents the lowest | |
643 | * TSN number in the datagram that was originally marked with the | |
644 | * CE bit. | |
645 | * | |
646 | * 0 1 2 3 | |
647 | * 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 | |
648 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
649 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
650 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
651 | * | Lowest TSN Number | | |
652 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
653 | * | |
654 | * Note: The CWR is considered a Control chunk. | |
655 | */ | |
656 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
657 | const __u32 lowest_tsn, | |
658 | const struct sctp_chunk *chunk) | |
659 | { | |
660 | struct sctp_chunk *retval; | |
661 | sctp_cwrhdr_t cwr; | |
662 | ||
663 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 664 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
cea8768f | 665 | sizeof(sctp_cwrhdr_t), GFP_ATOMIC); |
1da177e4 LT |
666 | |
667 | if (!retval) | |
668 | goto nodata; | |
669 | ||
670 | retval->subh.ecn_cwr_hdr = | |
671 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
672 | ||
673 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
674 | * | |
675 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
676 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
677 | * address from which it * received the DATA or control chunk | |
678 | * to which it is replying. | |
679 | * | |
680 | * [Report a reduced congestion window back to where the ECNE | |
681 | * came from.] | |
682 | */ | |
683 | if (chunk) | |
684 | retval->transport = chunk->transport; | |
685 | ||
686 | nodata: | |
687 | return retval; | |
688 | } | |
689 | ||
690 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
691 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
692 | const __u32 lowest_tsn) | |
693 | { | |
694 | struct sctp_chunk *retval; | |
695 | sctp_ecnehdr_t ecne; | |
696 | ||
697 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 698 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
cea8768f | 699 | sizeof(sctp_ecnehdr_t), GFP_ATOMIC); |
1da177e4 LT |
700 | if (!retval) |
701 | goto nodata; | |
702 | retval->subh.ecne_hdr = | |
703 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
704 | ||
705 | nodata: | |
706 | return retval; | |
707 | } | |
708 | ||
a6c2f792 XL |
709 | static void sctp_set_prsctp_policy(struct sctp_chunk *chunk, |
710 | const struct sctp_sndrcvinfo *sinfo) | |
711 | { | |
712 | if (!chunk->asoc->prsctp_enable) | |
713 | return; | |
714 | ||
715 | if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags)) | |
716 | chunk->prsctp_param = | |
717 | jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive); | |
8dbdf1f5 XL |
718 | else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags) || |
719 | SCTP_PR_PRIO_ENABLED(sinfo->sinfo_flags)) | |
01aadb3a | 720 | chunk->prsctp_param = sinfo->sinfo_timetolive; |
a6c2f792 XL |
721 | } |
722 | ||
1da177e4 LT |
723 | /* Make a DATA chunk for the given association from the provided |
724 | * parameters. However, do not populate the data payload. | |
725 | */ | |
726 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, | |
727 | const struct sctp_sndrcvinfo *sinfo, | |
cea8768f MRL |
728 | int data_len, __u8 flags, __u16 ssn, |
729 | gfp_t gfp) | |
1da177e4 LT |
730 | { |
731 | struct sctp_chunk *retval; | |
732 | struct sctp_datahdr dp; | |
733 | int chunk_len; | |
734 | ||
735 | /* We assign the TSN as LATE as possible, not here when | |
736 | * creating the chunk. | |
737 | */ | |
738 | dp.tsn = 0; | |
739 | dp.stream = htons(sinfo->sinfo_stream); | |
740 | dp.ppid = sinfo->sinfo_ppid; | |
741 | ||
742 | /* Set the flags for an unordered send. */ | |
eaa5c54d | 743 | if (sinfo->sinfo_flags & SCTP_UNORDERED) { |
1da177e4 LT |
744 | flags |= SCTP_DATA_UNORDERED; |
745 | dp.ssn = 0; | |
746 | } else | |
747 | dp.ssn = htons(ssn); | |
748 | ||
749 | chunk_len = sizeof(dp) + data_len; | |
cea8768f | 750 | retval = sctp_make_data(asoc, flags, chunk_len, gfp); |
1da177e4 LT |
751 | if (!retval) |
752 | goto nodata; | |
753 | ||
754 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
755 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
a6c2f792 | 756 | sctp_set_prsctp_policy(retval, sinfo); |
1da177e4 LT |
757 | |
758 | nodata: | |
759 | return retval; | |
760 | } | |
761 | ||
762 | /* Create a selective ackowledgement (SACK) for the given | |
763 | * association. This reports on which TSN's we've seen to date, | |
764 | * including duplicates and gaps. | |
765 | */ | |
766 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) | |
767 | { | |
768 | struct sctp_chunk *retval; | |
769 | struct sctp_sackhdr sack; | |
770 | int len; | |
771 | __u32 ctsn; | |
772 | __u16 num_gabs, num_dup_tsns; | |
4244854d | 773 | struct sctp_association *aptr = (struct sctp_association *)asoc; |
1da177e4 | 774 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
02015180 | 775 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
4244854d | 776 | struct sctp_transport *trans; |
1da177e4 | 777 | |
02015180 | 778 | memset(gabs, 0, sizeof(gabs)); |
1da177e4 | 779 | ctsn = sctp_tsnmap_get_ctsn(map); |
bb33381d DB |
780 | |
781 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); | |
1da177e4 LT |
782 | |
783 | /* How much room is needed in the chunk? */ | |
02015180 | 784 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
1da177e4 LT |
785 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
786 | ||
787 | /* Initialize the SACK header. */ | |
788 | sack.cum_tsn_ack = htonl(ctsn); | |
789 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
790 | sack.num_gap_ack_blocks = htons(num_gabs); | |
791 | sack.num_dup_tsns = htons(num_dup_tsns); | |
792 | ||
793 | len = sizeof(sack) | |
794 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
795 | + sizeof(__u32) * num_dup_tsns; | |
796 | ||
797 | /* Create the chunk. */ | |
cea8768f | 798 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); |
1da177e4 LT |
799 | if (!retval) |
800 | goto nodata; | |
801 | ||
802 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
803 | * | |
804 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
805 | * HEARTBEAT ACK, etc.) to the same destination transport | |
806 | * address from which it received the DATA or control chunk to | |
807 | * which it is replying. This rule should also be followed if | |
808 | * the endpoint is bundling DATA chunks together with the | |
809 | * reply chunk. | |
810 | * | |
811 | * However, when acknowledging multiple DATA chunks received | |
812 | * in packets from different source addresses in a single | |
813 | * SACK, the SACK chunk may be transmitted to one of the | |
814 | * destination transport addresses from which the DATA or | |
815 | * control chunks being acknowledged were received. | |
816 | * | |
817 | * [BUG: We do not implement the following paragraph. | |
818 | * Perhaps we should remember the last transport we used for a | |
819 | * SACK and avoid that (if possible) if we have seen any | |
820 | * duplicates. --piggy] | |
821 | * | |
822 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
823 | * multi- homed endpoint it MAY be beneficial to vary the | |
824 | * destination address and not use the source address of the | |
825 | * DATA chunk. The reason being that receiving a duplicate | |
826 | * from a multi-homed endpoint might indicate that the return | |
827 | * path (as specified in the source address of the DATA chunk) | |
828 | * for the SACK is broken. | |
829 | * | |
830 | * [Send to the address from which we last received a DATA chunk.] | |
831 | */ | |
832 | retval->transport = asoc->peer.last_data_from; | |
833 | ||
834 | retval->subh.sack_hdr = | |
835 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
836 | ||
837 | /* Add the gap ack block information. */ | |
838 | if (num_gabs) | |
839 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
02015180 | 840 | gabs); |
1da177e4 LT |
841 | |
842 | /* Add the duplicate TSN information. */ | |
196d6759 MB |
843 | if (num_dup_tsns) { |
844 | aptr->stats.idupchunks += num_dup_tsns; | |
1da177e4 LT |
845 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
846 | sctp_tsnmap_get_dups(map)); | |
196d6759 | 847 | } |
4244854d NH |
848 | /* Once we have a sack generated, check to see what our sack |
849 | * generation is, if its 0, reset the transports to 0, and reset | |
850 | * the association generation to 1 | |
851 | * | |
852 | * The idea is that zero is never used as a valid generation for the | |
853 | * association so no transport will match after a wrap event like this, | |
854 | * Until the next sack | |
855 | */ | |
856 | if (++aptr->peer.sack_generation == 0) { | |
857 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
858 | transports) | |
859 | trans->sack_generation = 0; | |
860 | aptr->peer.sack_generation = 1; | |
861 | } | |
1da177e4 LT |
862 | nodata: |
863 | return retval; | |
864 | } | |
865 | ||
866 | /* Make a SHUTDOWN chunk. */ | |
867 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
868 | const struct sctp_chunk *chunk) | |
869 | { | |
870 | struct sctp_chunk *retval; | |
871 | sctp_shutdownhdr_t shut; | |
872 | __u32 ctsn; | |
873 | ||
874 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
875 | shut.cum_tsn_ack = htonl(ctsn); | |
876 | ||
072017b4 | 877 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
cea8768f | 878 | sizeof(sctp_shutdownhdr_t), GFP_ATOMIC); |
1da177e4 LT |
879 | if (!retval) |
880 | goto nodata; | |
881 | ||
882 | retval->subh.shutdown_hdr = | |
883 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
884 | ||
885 | if (chunk) | |
886 | retval->transport = chunk->transport; | |
887 | nodata: | |
888 | return retval; | |
889 | } | |
890 | ||
891 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
892 | const struct sctp_chunk *chunk) | |
893 | { | |
894 | struct sctp_chunk *retval; | |
895 | ||
cea8768f MRL |
896 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
897 | GFP_ATOMIC); | |
1da177e4 LT |
898 | |
899 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
900 | * | |
901 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
902 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
903 | * address from which it * received the DATA or control chunk | |
904 | * to which it is replying. | |
905 | * | |
906 | * [ACK back to where the SHUTDOWN came from.] | |
907 | */ | |
908 | if (retval && chunk) | |
909 | retval->transport = chunk->transport; | |
910 | ||
911 | return retval; | |
912 | } | |
913 | ||
914 | struct sctp_chunk *sctp_make_shutdown_complete( | |
915 | const struct sctp_association *asoc, | |
916 | const struct sctp_chunk *chunk) | |
917 | { | |
918 | struct sctp_chunk *retval; | |
919 | __u8 flags = 0; | |
920 | ||
047a2428 JF |
921 | /* Set the T-bit if we have no association (vtag will be |
922 | * reflected) | |
923 | */ | |
1da177e4 LT |
924 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
925 | ||
cea8768f MRL |
926 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
927 | 0, GFP_ATOMIC); | |
1da177e4 LT |
928 | |
929 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
930 | * | |
931 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
932 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
933 | * address from which it * received the DATA or control chunk | |
934 | * to which it is replying. | |
935 | * | |
936 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
937 | * came from.] | |
938 | */ | |
939 | if (retval && chunk) | |
940 | retval->transport = chunk->transport; | |
941 | ||
d808ad9a | 942 | return retval; |
1da177e4 LT |
943 | } |
944 | ||
945 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 946 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
947 | */ |
948 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
949 | const struct sctp_chunk *chunk, | |
950 | const size_t hint) | |
951 | { | |
952 | struct sctp_chunk *retval; | |
953 | __u8 flags = 0; | |
954 | ||
047a2428 JF |
955 | /* Set the T-bit if we have no association and 'chunk' is not |
956 | * an INIT (vtag will be reflected). | |
957 | */ | |
958 | if (!asoc) { | |
959 | if (chunk && chunk->chunk_hdr && | |
960 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
961 | flags = 0; | |
962 | else | |
963 | flags = SCTP_CHUNK_FLAG_T; | |
964 | } | |
1da177e4 | 965 | |
cea8768f MRL |
966 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
967 | GFP_ATOMIC); | |
1da177e4 LT |
968 | |
969 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
970 | * | |
971 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
972 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
973 | * address from which it * received the DATA or control chunk | |
974 | * to which it is replying. | |
975 | * | |
976 | * [ABORT back to where the offender came from.] | |
977 | */ | |
978 | if (retval && chunk) | |
979 | retval->transport = chunk->transport; | |
980 | ||
981 | return retval; | |
982 | } | |
983 | ||
984 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
985 | struct sctp_chunk *sctp_make_abort_no_data( | |
986 | const struct sctp_association *asoc, | |
987 | const struct sctp_chunk *chunk, __u32 tsn) | |
988 | { | |
989 | struct sctp_chunk *retval; | |
9f81bcd9 | 990 | __be32 payload; |
1da177e4 LT |
991 | |
992 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) | |
993 | + sizeof(tsn)); | |
994 | ||
995 | if (!retval) | |
996 | goto no_mem; | |
997 | ||
998 | /* Put the tsn back into network byte order. */ | |
999 | payload = htonl(tsn); | |
00f1c2df WY |
1000 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
1001 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
1002 | |
1003 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1004 | * | |
1005 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1006 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1007 | * address from which it * received the DATA or control chunk | |
1008 | * to which it is replying. | |
1009 | * | |
1010 | * [ABORT back to where the offender came from.] | |
1011 | */ | |
1012 | if (chunk) | |
1013 | retval->transport = chunk->transport; | |
1014 | ||
1015 | no_mem: | |
1016 | return retval; | |
1017 | } | |
1018 | ||
1019 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1020 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1021 | struct msghdr *msg, |
c164a9ba | 1022 | size_t paylen) |
1da177e4 LT |
1023 | { |
1024 | struct sctp_chunk *retval; | |
c164a9ba SS |
1025 | void *payload = NULL; |
1026 | int err; | |
1da177e4 | 1027 | |
c164a9ba | 1028 | retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); |
1da177e4 LT |
1029 | if (!retval) |
1030 | goto err_chunk; | |
1031 | ||
1032 | if (paylen) { | |
1033 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1034 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1035 | if (!payload) |
1036 | goto err_payload; | |
c164a9ba | 1037 | |
6ce8e9ce | 1038 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1039 | if (err < 0) |
1040 | goto err_copy; | |
1da177e4 LT |
1041 | } |
1042 | ||
00f1c2df WY |
1043 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1044 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1045 | |
1046 | if (paylen) | |
1047 | kfree(payload); | |
1048 | ||
1049 | return retval; | |
1050 | ||
1051 | err_copy: | |
1052 | kfree(payload); | |
1053 | err_payload: | |
1054 | sctp_chunk_free(retval); | |
1055 | retval = NULL; | |
1056 | err_chunk: | |
1057 | return retval; | |
1058 | } | |
1059 | ||
5c94bf86 AB |
1060 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1061 | * enough. | |
1062 | */ | |
1063 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1064 | const void *data) | |
1065 | { | |
1066 | void *target; | |
1067 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
1068 | ||
1069 | target = skb_put(chunk->skb, len); | |
1070 | ||
6383cfb3 VY |
1071 | if (data) |
1072 | memcpy(target, data, len); | |
1073 | else | |
1074 | memset(target, 0, len); | |
5c94bf86 AB |
1075 | |
1076 | /* Adjust the chunk length field. */ | |
1077 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1078 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1079 | ||
1080 | return target; | |
1081 | } | |
1082 | ||
d808ad9a | 1083 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 LT |
1084 | struct sctp_chunk *sctp_make_abort_violation( |
1085 | const struct sctp_association *asoc, | |
1086 | const struct sctp_chunk *chunk, | |
1087 | const __u8 *payload, | |
1088 | const size_t paylen) | |
1089 | { | |
1090 | struct sctp_chunk *retval; | |
1091 | struct sctp_paramhdr phdr; | |
1092 | ||
1093 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen | |
00f1c2df | 1094 | + sizeof(sctp_paramhdr_t)); |
1da177e4 LT |
1095 | if (!retval) |
1096 | goto end; | |
1097 | ||
00f1c2df WY |
1098 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen |
1099 | + sizeof(sctp_paramhdr_t)); | |
1da177e4 LT |
1100 | |
1101 | phdr.type = htons(chunk->chunk_hdr->type); | |
1102 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df WY |
1103 | sctp_addto_chunk(retval, paylen, payload); |
1104 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); | |
1da177e4 LT |
1105 | |
1106 | end: | |
1107 | return retval; | |
1108 | } | |
1109 | ||
ba016670 WY |
1110 | struct sctp_chunk *sctp_make_violation_paramlen( |
1111 | const struct sctp_association *asoc, | |
1112 | const struct sctp_chunk *chunk, | |
1113 | struct sctp_paramhdr *param) | |
1114 | { | |
1115 | struct sctp_chunk *retval; | |
1116 | static const char error[] = "The following parameter had invalid length:"; | |
1117 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + | |
1118 | sizeof(sctp_paramhdr_t); | |
1119 | ||
1120 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1121 | if (!retval) | |
1122 | goto nodata; | |
1123 | ||
1124 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
1125 | sizeof(error) + sizeof(sctp_paramhdr_t)); | |
1126 | sctp_addto_chunk(retval, sizeof(error), error); | |
1127 | sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); | |
1128 | ||
1129 | nodata: | |
1130 | return retval; | |
1131 | } | |
1132 | ||
de4594a5 NH |
1133 | struct sctp_chunk *sctp_make_violation_max_retrans( |
1134 | const struct sctp_association *asoc, | |
1135 | const struct sctp_chunk *chunk) | |
1136 | { | |
1137 | struct sctp_chunk *retval; | |
1138 | static const char error[] = "Association exceeded its max_retans count"; | |
1139 | size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); | |
1140 | ||
1141 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1142 | if (!retval) | |
1143 | goto nodata; | |
1144 | ||
1145 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1146 | sctp_addto_chunk(retval, sizeof(error), error); | |
1147 | ||
1148 | nodata: | |
1149 | return retval; | |
1150 | } | |
1151 | ||
1da177e4 LT |
1152 | /* Make a HEARTBEAT chunk. */ |
1153 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
92c73af5 | 1154 | const struct sctp_transport *transport) |
1da177e4 | 1155 | { |
92c73af5 WY |
1156 | struct sctp_chunk *retval; |
1157 | sctp_sender_hb_info_t hbinfo; | |
1158 | ||
cea8768f MRL |
1159 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1160 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1161 | |
1162 | if (!retval) | |
1163 | goto nodata; | |
1164 | ||
92c73af5 WY |
1165 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
1166 | hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); | |
1167 | hbinfo.daddr = transport->ipaddr; | |
1168 | hbinfo.sent_at = jiffies; | |
1169 | hbinfo.hb_nonce = transport->hb_nonce; | |
1170 | ||
1da177e4 LT |
1171 | /* Cast away the 'const', as this is just telling the chunk |
1172 | * what transport it belongs to. | |
1173 | */ | |
1174 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1175 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1176 | &hbinfo); | |
1da177e4 LT |
1177 | |
1178 | nodata: | |
1179 | return retval; | |
1180 | } | |
1181 | ||
1182 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
1183 | const struct sctp_chunk *chunk, | |
1184 | const void *payload, const size_t paylen) | |
1185 | { | |
1186 | struct sctp_chunk *retval; | |
1187 | ||
cea8768f MRL |
1188 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1189 | GFP_ATOMIC); | |
1da177e4 LT |
1190 | if (!retval) |
1191 | goto nodata; | |
1192 | ||
1193 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1194 | ||
1195 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1196 | * | |
1197 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1198 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1199 | * address from which it * received the DATA or control chunk | |
1200 | * to which it is replying. | |
1201 | * | |
1202 | * [HBACK back to where the HEARTBEAT came from.] | |
1203 | */ | |
1204 | if (chunk) | |
1205 | retval->transport = chunk->transport; | |
1206 | ||
1207 | nodata: | |
1208 | return retval; | |
1209 | } | |
1210 | ||
1211 | /* Create an Operation Error chunk with the specified space reserved. | |
1212 | * This routine can be used for containing multiple causes in the chunk. | |
1213 | */ | |
1214 | static struct sctp_chunk *sctp_make_op_error_space( | |
1215 | const struct sctp_association *asoc, | |
1216 | const struct sctp_chunk *chunk, | |
1217 | size_t size) | |
1218 | { | |
1219 | struct sctp_chunk *retval; | |
1220 | ||
072017b4 | 1221 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
cea8768f | 1222 | sizeof(sctp_errhdr_t) + size, GFP_ATOMIC); |
1da177e4 LT |
1223 | if (!retval) |
1224 | goto nodata; | |
1225 | ||
1226 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1227 | * | |
1228 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1229 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1230 | * address from which it received the DATA or control chunk | |
1231 | * to which it is replying. | |
1232 | * | |
1233 | */ | |
1234 | if (chunk) | |
1235 | retval->transport = chunk->transport; | |
1236 | ||
1237 | nodata: | |
1238 | return retval; | |
1239 | } | |
1240 | ||
5fa782c2 NH |
1241 | /* Create an Operation Error chunk of a fixed size, |
1242 | * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) | |
1243 | * This is a helper function to allocate an error chunk for | |
1244 | * for those invalid parameter codes in which we may not want | |
d82603c6 | 1245 | * to report all the errors, if the incoming chunk is large |
5fa782c2 NH |
1246 | */ |
1247 | static inline struct sctp_chunk *sctp_make_op_error_fixed( | |
1248 | const struct sctp_association *asoc, | |
1249 | const struct sctp_chunk *chunk) | |
1250 | { | |
1251 | size_t size = asoc ? asoc->pathmtu : 0; | |
1252 | ||
1253 | if (!size) | |
1254 | size = SCTP_DEFAULT_MAXSEGMENT; | |
1255 | ||
1256 | return sctp_make_op_error_space(asoc, chunk, size); | |
1257 | } | |
1258 | ||
1da177e4 LT |
1259 | /* Create an Operation Error chunk. */ |
1260 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
1261 | const struct sctp_chunk *chunk, | |
63706c5c | 1262 | __be16 cause_code, const void *payload, |
6383cfb3 | 1263 | size_t paylen, size_t reserve_tail) |
1da177e4 LT |
1264 | { |
1265 | struct sctp_chunk *retval; | |
1266 | ||
6383cfb3 | 1267 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1268 | if (!retval) |
1269 | goto nodata; | |
1270 | ||
6383cfb3 | 1271 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1272 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1273 | if (reserve_tail) |
1274 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1275 | |
1276 | nodata: | |
1277 | return retval; | |
1278 | } | |
1279 | ||
4cd57c80 VY |
1280 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) |
1281 | { | |
1282 | struct sctp_chunk *retval; | |
1283 | struct sctp_hmac *hmac_desc; | |
1284 | struct sctp_authhdr auth_hdr; | |
1285 | __u8 *hmac; | |
1286 | ||
1287 | /* Get the first hmac that the peer told us to use */ | |
1288 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1289 | if (unlikely(!hmac_desc)) | |
1290 | return NULL; | |
1291 | ||
072017b4 | 1292 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
cea8768f MRL |
1293 | hmac_desc->hmac_len + sizeof(sctp_authhdr_t), |
1294 | GFP_ATOMIC); | |
4cd57c80 VY |
1295 | if (!retval) |
1296 | return NULL; | |
1297 | ||
1298 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1299 | auth_hdr.shkey_id = htons(asoc->active_key_id); | |
1300 | ||
1301 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), | |
1302 | &auth_hdr); | |
1303 | ||
1304 | hmac = skb_put(retval->skb, hmac_desc->hmac_len); | |
1305 | memset(hmac, 0, hmac_desc->hmac_len); | |
1306 | ||
1307 | /* Adjust the chunk header to include the empty MAC */ | |
1308 | retval->chunk_hdr->length = | |
1309 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1310 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1311 | ||
1312 | return retval; | |
1313 | } | |
1314 | ||
1315 | ||
1da177e4 LT |
1316 | /******************************************************************** |
1317 | * 2nd Level Abstractions | |
1318 | ********************************************************************/ | |
1319 | ||
1320 | /* Turn an skb into a chunk. | |
1321 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1322 | * |
1323 | * sctpimpguide-05.txt Section 2.8.2 | |
1324 | * M1) Each time a new DATA chunk is transmitted | |
1325 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1326 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1327 | * and when to fast retransmit. | |
1328 | * | |
1da177e4 LT |
1329 | */ |
1330 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
1331 | const struct sctp_association *asoc, | |
cea8768f | 1332 | struct sock *sk, gfp_t gfp) |
1da177e4 LT |
1333 | { |
1334 | struct sctp_chunk *retval; | |
1335 | ||
cea8768f | 1336 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1337 | |
1338 | if (!retval) | |
1339 | goto nodata; | |
bb33381d DB |
1340 | if (!sk) |
1341 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1342 | |
79af02c2 | 1343 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1344 | retval->skb = skb; |
1345 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1346 | retval->singleton = 1; |
1da177e4 | 1347 | |
3dc0a548 | 1348 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1349 | |
1350 | /* Polish the bead hole. */ | |
1351 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1352 | INIT_LIST_HEAD(&retval->frag_list); | |
1353 | SCTP_DBG_OBJCNT_INC(chunk); | |
1354 | atomic_set(&retval->refcnt, 1); | |
1355 | ||
1356 | nodata: | |
1357 | return retval; | |
1358 | } | |
1359 | ||
1360 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1361 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1362 | union sctp_addr *dest) | |
1363 | { | |
f235fca3 | 1364 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1365 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1366 | } |
1367 | ||
1368 | /* Extract the source address from a chunk. */ | |
1369 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1370 | { | |
1371 | /* If we have a known transport, use that. */ | |
1372 | if (chunk->transport) { | |
6a1e5f33 | 1373 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1374 | } else { |
1375 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1376 | return &chunk->source; |
1da177e4 LT |
1377 | } |
1378 | } | |
1379 | ||
1380 | /* Create a new chunk, setting the type and flags headers from the | |
1381 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1382 | */ | |
072017b4 | 1383 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
1384 | __u8 type, __u8 flags, int paylen, |
1385 | gfp_t gfp) | |
1da177e4 LT |
1386 | { |
1387 | struct sctp_chunk *retval; | |
1388 | sctp_chunkhdr_t *chunk_hdr; | |
1389 | struct sk_buff *skb; | |
1390 | struct sock *sk; | |
1391 | ||
1392 | /* No need to allocate LL here, as this is only a chunk. */ | |
cea8768f | 1393 | skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), gfp); |
1da177e4 LT |
1394 | if (!skb) |
1395 | goto nodata; | |
1396 | ||
1397 | /* Make room for the chunk header. */ | |
1398 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); | |
1399 | chunk_hdr->type = type; | |
1400 | chunk_hdr->flags = flags; | |
1401 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); | |
1402 | ||
1403 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1404 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1405 | if (!retval) { |
1406 | kfree_skb(skb); | |
1407 | goto nodata; | |
1408 | } | |
1409 | ||
1410 | retval->chunk_hdr = chunk_hdr; | |
1411 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); | |
1412 | ||
4cd57c80 VY |
1413 | /* Determine if the chunk needs to be authenticated */ |
1414 | if (sctp_auth_send_cid(type, asoc)) | |
1415 | retval->auth = 1; | |
1416 | ||
1da177e4 LT |
1417 | return retval; |
1418 | nodata: | |
1419 | return NULL; | |
1420 | } | |
1421 | ||
072017b4 | 1422 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1423 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1424 | { |
cea8768f | 1425 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1426 | } |
1427 | ||
1428 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, | |
cea8768f MRL |
1429 | __u8 type, __u8 flags, int paylen, |
1430 | gfp_t gfp) | |
072017b4 | 1431 | { |
cea8768f | 1432 | struct sctp_chunk *chunk; |
072017b4 | 1433 | |
cea8768f | 1434 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1435 | if (chunk) |
1436 | sctp_control_set_owner_w(chunk); | |
1437 | ||
1438 | return chunk; | |
1439 | } | |
1da177e4 LT |
1440 | |
1441 | /* Release the memory occupied by a chunk. */ | |
1442 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1443 | { | |
a08de64d VY |
1444 | BUG_ON(!list_empty(&chunk->list)); |
1445 | list_del_init(&chunk->transmitted_list); | |
1446 | ||
c485658b DB |
1447 | consume_skb(chunk->skb); |
1448 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1449 | |
1450 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1451 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1452 | } | |
1453 | ||
1454 | /* Possibly, free the chunk. */ | |
1455 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1456 | { | |
1da177e4 LT |
1457 | /* Release our reference on the message tracker. */ |
1458 | if (chunk->msg) | |
1459 | sctp_datamsg_put(chunk->msg); | |
1460 | ||
1461 | sctp_chunk_put(chunk); | |
1462 | } | |
1463 | ||
1464 | /* Grab a reference to the chunk. */ | |
1465 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1466 | { | |
1467 | atomic_inc(&ch->refcnt); | |
1468 | } | |
1469 | ||
1470 | /* Release a reference to the chunk. */ | |
1471 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1472 | { | |
1473 | if (atomic_dec_and_test(&ch->refcnt)) | |
1474 | sctp_chunk_destroy(ch); | |
1475 | } | |
1476 | ||
1477 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1478 | * enough. | |
1479 | */ | |
1480 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1481 | { | |
1482 | void *target; | |
1483 | void *padding; | |
1484 | int chunklen = ntohs(chunk->chunk_hdr->length); | |
8d614ade | 1485 | int padlen = WORD_ROUND(chunklen) - chunklen; |
1da177e4 LT |
1486 | |
1487 | padding = skb_put(chunk->skb, padlen); | |
1488 | target = skb_put(chunk->skb, len); | |
1489 | ||
1490 | memset(padding, 0, padlen); | |
1491 | memcpy(target, data, len); | |
1492 | ||
1493 | /* Adjust the chunk length field. */ | |
1494 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1495 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1496 | |
1497 | return target; | |
1498 | } | |
1499 | ||
5fa782c2 NH |
1500 | /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient |
1501 | * space in the chunk | |
1502 | */ | |
6daaf0de | 1503 | static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, |
1504 | int len, const void *data) | |
5fa782c2 | 1505 | { |
2e3219b5 | 1506 | if (skb_tailroom(chunk->skb) >= len) |
5fa782c2 NH |
1507 | return sctp_addto_chunk(chunk, len, data); |
1508 | else | |
1509 | return NULL; | |
1510 | } | |
1511 | ||
1da177e4 LT |
1512 | /* Append bytes from user space to the end of a chunk. Will panic if |
1513 | * chunk is not big enough. | |
1514 | * Returns a kernel err value. | |
1515 | */ | |
e0eb093e AV |
1516 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1517 | struct iov_iter *from) | |
1da177e4 | 1518 | { |
e0eb093e AV |
1519 | void *target; |
1520 | ssize_t copied; | |
1da177e4 LT |
1521 | |
1522 | /* Make room in chunk for data. */ | |
1523 | target = skb_put(chunk->skb, len); | |
1524 | ||
1525 | /* Copy data (whole iovec) into chunk */ | |
e0eb093e AV |
1526 | copied = copy_from_iter(target, len, from); |
1527 | if (copied != len) | |
1528 | return -EFAULT; | |
1da177e4 LT |
1529 | |
1530 | /* Adjust the chunk length field. */ | |
1531 | chunk->chunk_hdr->length = | |
1532 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1533 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1534 | |
e0eb093e | 1535 | return 0; |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | /* Helper function to assign a TSN if needed. This assumes that both | |
1539 | * the data_hdr and association have already been assigned. | |
1540 | */ | |
1541 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1542 | { | |
ab3e5e7b VY |
1543 | struct sctp_datamsg *msg; |
1544 | struct sctp_chunk *lchunk; | |
1545 | struct sctp_stream *stream; | |
1da177e4 LT |
1546 | __u16 ssn; |
1547 | __u16 sid; | |
1548 | ||
1549 | if (chunk->has_ssn) | |
1550 | return; | |
1551 | ||
ab3e5e7b VY |
1552 | /* All fragments will be on the same stream */ |
1553 | sid = ntohs(chunk->subh.data_hdr->stream); | |
1554 | stream = &chunk->asoc->ssnmap->out; | |
1da177e4 | 1555 | |
ab3e5e7b VY |
1556 | /* Now assign the sequence number to the entire message. |
1557 | * All fragments must have the same stream sequence number. | |
1558 | */ | |
1559 | msg = chunk->msg; | |
1560 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1561 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1562 | ssn = 0; | |
1563 | } else { | |
1564 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
1565 | ssn = sctp_ssn_next(stream, sid); | |
1566 | else | |
1567 | ssn = sctp_ssn_peek(stream, sid); | |
1568 | } | |
1569 | ||
1570 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1571 | lchunk->has_ssn = 1; | |
1572 | } | |
1da177e4 LT |
1573 | } |
1574 | ||
1575 | /* Helper function to assign a TSN if needed. This assumes that both | |
1576 | * the data_hdr and association have already been assigned. | |
1577 | */ | |
1578 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1579 | { | |
1580 | if (!chunk->has_tsn) { | |
1581 | /* This is the last possible instant to | |
1582 | * assign a TSN. | |
1583 | */ | |
1584 | chunk->subh.data_hdr->tsn = | |
1585 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1586 | chunk->has_tsn = 1; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | /* Create a CLOSED association to use with an incoming packet. */ | |
1591 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
3182cd84 | 1592 | struct sctp_chunk *chunk, |
dd0fc66f | 1593 | gfp_t gfp) |
1da177e4 LT |
1594 | { |
1595 | struct sctp_association *asoc; | |
1596 | struct sk_buff *skb; | |
1597 | sctp_scope_t scope; | |
1da177e4 LT |
1598 | |
1599 | /* Create the bare association. */ | |
1600 | scope = sctp_scope(sctp_source(chunk)); | |
1601 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1602 | if (!asoc) | |
1603 | goto nodata; | |
1604 | asoc->temp = 1; | |
1605 | skb = chunk->skb; | |
1606 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1607 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1608 | ||
1da177e4 LT |
1609 | nodata: |
1610 | return asoc; | |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | /* Build a cookie representing asoc. | |
1614 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1615 | */ | |
1616 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, | |
1617 | const struct sctp_association *asoc, | |
1618 | const struct sctp_chunk *init_chunk, | |
1619 | int *cookie_len, | |
1620 | const __u8 *raw_addrs, int addrs_len) | |
1621 | { | |
1622 | sctp_cookie_param_t *retval; | |
1623 | struct sctp_signed_cookie *cookie; | |
1da177e4 | 1624 | int headersize, bodysize; |
1da177e4 | 1625 | |
9834a2bb VY |
1626 | /* Header size is static data prior to the actual cookie, including |
1627 | * any padding. | |
1628 | */ | |
d808ad9a YH |
1629 | headersize = sizeof(sctp_paramhdr_t) + |
1630 | (sizeof(struct sctp_signed_cookie) - | |
9834a2bb | 1631 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1632 | bodysize = sizeof(struct sctp_cookie) |
1633 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1634 | ||
1635 | /* Pad out the cookie to a multiple to make the signature | |
1636 | * functions simpler to write. | |
1637 | */ | |
1638 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1639 | bodysize += SCTP_COOKIE_MULTIPLE | |
1640 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1641 | *cookie_len = headersize + bodysize; | |
1642 | ||
1da177e4 LT |
1643 | /* Clear this memory since we are sending this data structure |
1644 | * out on the network. | |
1645 | */ | |
af997d8c ACM |
1646 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1647 | if (!retval) | |
1648 | goto nodata; | |
1649 | ||
1da177e4 LT |
1650 | cookie = (struct sctp_signed_cookie *) retval->body; |
1651 | ||
1652 | /* Set up the parameter header. */ | |
1653 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1654 | retval->p.length = htons(*cookie_len); | |
1655 | ||
1656 | /* Copy the cookie part of the association itself. */ | |
1657 | cookie->c = asoc->c; | |
1658 | /* Save the raw address list length in the cookie. */ | |
1659 | cookie->c.raw_addr_list_len = addrs_len; | |
1660 | ||
1661 | /* Remember PR-SCTP capability. */ | |
1662 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1663 | ||
0f3fffd8 ISJ |
1664 | /* Save adaptation indication in the cookie. */ |
1665 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1666 | |
1667 | /* Set an expiration time for the cookie. */ | |
52db882f | 1668 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1669 | ktime_get_real()); |
1da177e4 LT |
1670 | |
1671 | /* Copy the peer's init packet. */ | |
1672 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1673 | ntohs(init_chunk->chunk_hdr->length)); | |
1674 | ||
1675 | /* Copy the raw local address list of the association. */ | |
1676 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1677 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1678 | ||
d808ad9a | 1679 | if (sctp_sk(ep->base.sk)->hmac) { |
5821c769 HX |
1680 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); |
1681 | int err; | |
1b489e11 | 1682 | |
1da177e4 | 1683 | /* Sign the message. */ |
5821c769 HX |
1684 | desc->tfm = sctp_sk(ep->base.sk)->hmac; |
1685 | desc->flags = 0; | |
1686 | ||
1687 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1688 | sizeof(ep->secret_key)) ?: | |
1689 | crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, | |
1690 | cookie->signature); | |
1691 | shash_desc_zero(desc); | |
1692 | if (err) | |
1b489e11 | 1693 | goto free_cookie; |
1da177e4 LT |
1694 | } |
1695 | ||
1da177e4 | 1696 | return retval; |
1b489e11 HX |
1697 | |
1698 | free_cookie: | |
1699 | kfree(retval); | |
1700 | nodata: | |
1701 | *cookie_len = 0; | |
1702 | return NULL; | |
1da177e4 LT |
1703 | } |
1704 | ||
1705 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1706 | struct sctp_association *sctp_unpack_cookie( | |
1707 | const struct sctp_endpoint *ep, | |
1708 | const struct sctp_association *asoc, | |
dd0fc66f | 1709 | struct sctp_chunk *chunk, gfp_t gfp, |
1da177e4 LT |
1710 | int *error, struct sctp_chunk **errp) |
1711 | { | |
1712 | struct sctp_association *retval = NULL; | |
1713 | struct sctp_signed_cookie *cookie; | |
1714 | struct sctp_cookie *bear_cookie; | |
1715 | int headersize, bodysize, fixed_size; | |
313e7b4d | 1716 | __u8 *digest = ep->digest; |
570617e7 | 1717 | unsigned int len; |
1da177e4 LT |
1718 | sctp_scope_t scope; |
1719 | struct sk_buff *skb = chunk->skb; | |
52db882f | 1720 | ktime_t kt; |
1da177e4 | 1721 | |
9834a2bb VY |
1722 | /* Header size is static data prior to the actual cookie, including |
1723 | * any padding. | |
1724 | */ | |
1725 | headersize = sizeof(sctp_chunkhdr_t) + | |
d808ad9a | 1726 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1727 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1728 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1729 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1730 | ||
1731 | /* Verify that the chunk looks like it even has a cookie. | |
1732 | * There must be enough room for our cookie and our peer's | |
1733 | * INIT chunk. | |
1734 | */ | |
1735 | len = ntohs(chunk->chunk_hdr->length); | |
1736 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1737 | goto malformed; | |
1738 | ||
1739 | /* Verify that the cookie has been padded out. */ | |
1740 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1741 | goto malformed; | |
1742 | ||
1743 | /* Process the cookie. */ | |
1744 | cookie = chunk->subh.cookie_hdr; | |
1745 | bear_cookie = &cookie->c; | |
1746 | ||
1747 | if (!sctp_sk(ep->base.sk)->hmac) | |
1748 | goto no_hmac; | |
1749 | ||
1750 | /* Check the signature. */ | |
5821c769 HX |
1751 | { |
1752 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); | |
1753 | int err; | |
1754 | ||
1755 | desc->tfm = sctp_sk(ep->base.sk)->hmac; | |
1756 | desc->flags = 0; | |
1757 | ||
1758 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1759 | sizeof(ep->secret_key)) ?: | |
1760 | crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, | |
1761 | digest); | |
1762 | shash_desc_zero(desc); | |
1763 | ||
1764 | if (err) { | |
1765 | *error = -SCTP_IERROR_NOMEM; | |
1766 | goto fail; | |
1767 | } | |
1b489e11 | 1768 | } |
1da177e4 LT |
1769 | |
1770 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
570617e7 DB |
1771 | *error = -SCTP_IERROR_BAD_SIG; |
1772 | goto fail; | |
1da177e4 LT |
1773 | } |
1774 | ||
1775 | no_hmac: | |
1776 | /* IG Section 2.35.2: | |
1777 | * 3) Compare the port numbers and the verification tag contained | |
1778 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1779 | * verification tag within the SCTP common header of the received | |
1780 | * packet. If these values do not match the packet MUST be silently | |
1781 | * discarded, | |
1782 | */ | |
1783 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1784 | *error = -SCTP_IERROR_BAD_TAG; | |
1785 | goto fail; | |
1786 | } | |
1787 | ||
9b1dfad0 | 1788 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1789 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1790 | *error = -SCTP_IERROR_BAD_PORTS; | |
1791 | goto fail; | |
1792 | } | |
1793 | ||
1794 | /* Check to see if the cookie is stale. If there is already | |
1795 | * an association, there is no need to check cookie's expiration | |
1796 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1797 | * If skb has been timestamped, then use the stamp, otherwise |
1798 | * use current time. This introduces a small possibility that | |
1799 | * that a cookie may be considered expired, but his would only slow | |
1800 | * down the new association establishment instead of every packet. | |
1da177e4 | 1801 | */ |
f236218b | 1802 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
52db882f | 1803 | kt = skb_get_ktime(skb); |
f236218b | 1804 | else |
cb5e173e | 1805 | kt = ktime_get_real(); |
f236218b | 1806 | |
67cb9366 | 1807 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
1da177e4 LT |
1808 | /* |
1809 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1810 | * | |
1811 | * Cause of error | |
1812 | * --------------- | |
1813 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1814 | * Cookie that has expired. | |
1815 | */ | |
1816 | len = ntohs(chunk->chunk_hdr->length); | |
1817 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1818 | if (*errp) { | |
52db882f | 1819 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
34bcca28 | 1820 | __be32 n = htonl(usecs); |
1da177e4 | 1821 | |
1da177e4 | 1822 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
00f1c2df WY |
1823 | sizeof(n)); |
1824 | sctp_addto_chunk(*errp, sizeof(n), &n); | |
1da177e4 LT |
1825 | *error = -SCTP_IERROR_STALE_COOKIE; |
1826 | } else | |
1827 | *error = -SCTP_IERROR_NOMEM; | |
1828 | ||
1829 | goto fail; | |
1830 | } | |
1831 | ||
1832 | /* Make a new base association. */ | |
1833 | scope = sctp_scope(sctp_source(chunk)); | |
1834 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1835 | if (!retval) { | |
1836 | *error = -SCTP_IERROR_NOMEM; | |
1837 | goto fail; | |
1838 | } | |
1839 | ||
1840 | /* Set up our peer's port number. */ | |
1841 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1842 | ||
1843 | /* Populate the association from the cookie. */ | |
1844 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1845 | ||
1846 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1847 | GFP_ATOMIC) < 0) { | |
1848 | *error = -SCTP_IERROR_NOMEM; | |
1849 | goto fail; | |
1850 | } | |
1851 | ||
1852 | /* Also, add the destination address. */ | |
1853 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1854 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1855 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1856 | GFP_ATOMIC); | |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | retval->next_tsn = retval->c.initial_tsn; | |
1860 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1861 | retval->addip_serial = retval->c.initial_tsn; | |
1862 | retval->adv_peer_ack_point = retval->ctsn_ack_point; | |
1863 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1864 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1865 | |
1866 | /* The INIT stuff will be done by the side effects. */ | |
1867 | return retval; | |
1868 | ||
1869 | fail: | |
1870 | if (retval) | |
1871 | sctp_association_free(retval); | |
1872 | ||
1873 | return NULL; | |
1874 | ||
1875 | malformed: | |
1876 | /* Yikes! The packet is either corrupt or deliberately | |
1877 | * malformed. | |
1878 | */ | |
1879 | *error = -SCTP_IERROR_MALFORMED; | |
1880 | goto fail; | |
1881 | } | |
1882 | ||
1883 | /******************************************************************** | |
1884 | * 3rd Level Abstractions | |
1885 | ********************************************************************/ | |
1886 | ||
1887 | struct __sctp_missing { | |
9f81bcd9 AV |
1888 | __be32 num_missing; |
1889 | __be16 type; | |
bc10502d | 1890 | } __packed; |
1da177e4 LT |
1891 | |
1892 | /* | |
1893 | * Report a missing mandatory parameter. | |
1894 | */ | |
1895 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
1896 | sctp_param_t paramtype, | |
1897 | struct sctp_chunk *chunk, | |
1898 | struct sctp_chunk **errp) | |
1899 | { | |
1900 | struct __sctp_missing report; | |
1901 | __u16 len; | |
1902 | ||
1903 | len = WORD_ROUND(sizeof(report)); | |
1904 | ||
1905 | /* Make an ERROR chunk, preparing enough room for | |
1906 | * returning multiple unknown parameters. | |
1907 | */ | |
1908 | if (!*errp) | |
1909 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1910 | ||
1911 | if (*errp) { | |
1912 | report.num_missing = htonl(1); | |
1913 | report.type = paramtype; | |
ebdfcad4 | 1914 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1915 | sizeof(report)); |
1916 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | /* Stop processing this chunk. */ | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | /* Report an Invalid Mandatory Parameter. */ | |
1924 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1925 | struct sctp_chunk *chunk, | |
1926 | struct sctp_chunk **errp) | |
1927 | { | |
1928 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1929 | ||
1930 | if (!*errp) | |
1931 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1932 | ||
1933 | if (*errp) | |
00f1c2df | 1934 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1935 | |
1936 | /* Stop processing this chunk. */ | |
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1941 | struct sctp_paramhdr *param, | |
1942 | const struct sctp_chunk *chunk, | |
1943 | struct sctp_chunk **errp) | |
1944 | { | |
7ab90804 VY |
1945 | /* This is a fatal error. Any accumulated non-fatal errors are |
1946 | * not reported. | |
1947 | */ | |
1948 | if (*errp) | |
1949 | sctp_chunk_free(*errp); | |
1950 | ||
1da177e4 | 1951 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1952 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1953 | |
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | ||
1958 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1959 | * send back an indicator to the peer. | |
1960 | */ | |
1961 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1962 | union sctp_params param, | |
1963 | struct sctp_chunk *chunk, | |
1964 | struct sctp_chunk **errp) | |
1965 | { | |
1966 | __u16 len = ntohs(param.p->length); | |
1967 | ||
7ab90804 VY |
1968 | /* Processing of the HOST_NAME parameter will generate an |
1969 | * ABORT. If we've accumulated any non-fatal errors, they | |
1970 | * would be unrecognized parameters and we should not include | |
1971 | * them in the ABORT. | |
1972 | */ | |
1973 | if (*errp) | |
1974 | sctp_chunk_free(*errp); | |
1975 | ||
1976 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1da177e4 | 1977 | |
00f1c2df WY |
1978 | if (*errp) { |
1979 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); | |
1980 | sctp_addto_chunk(*errp, len, param.v); | |
1981 | } | |
1da177e4 LT |
1982 | |
1983 | /* Stop processing this chunk. */ | |
1984 | return 0; | |
1985 | } | |
1986 | ||
f53b5b09 | 1987 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
d6701191 VY |
1988 | { |
1989 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
1990 | int have_auth = 0; | |
1991 | int have_asconf = 0; | |
1992 | int i; | |
1993 | ||
1994 | for (i = 0; i < num_ext; i++) { | |
1995 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1996 | case SCTP_CID_AUTH: |
1997 | have_auth = 1; | |
1998 | break; | |
1999 | case SCTP_CID_ASCONF: | |
2000 | case SCTP_CID_ASCONF_ACK: | |
2001 | have_asconf = 1; | |
2002 | break; | |
d6701191 VY |
2003 | } |
2004 | } | |
2005 | ||
2006 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
2007 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
2008 | * only if ADD-IP is turned on and we are not backward-compatible | |
2009 | * mode. | |
2010 | */ | |
e1fc3b14 | 2011 | if (net->sctp.addip_noauth) |
d6701191 VY |
2012 | return 1; |
2013 | ||
e1fc3b14 | 2014 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
d6701191 VY |
2015 | return 0; |
2016 | ||
2017 | return 1; | |
2018 | } | |
2019 | ||
131a47e3 VY |
2020 | static void sctp_process_ext_param(struct sctp_association *asoc, |
2021 | union sctp_params param) | |
2022 | { | |
e1fc3b14 | 2023 | struct net *net = sock_net(asoc->base.sk); |
131a47e3 VY |
2024 | __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
2025 | int i; | |
2026 | ||
2027 | for (i = 0; i < num_ext; i++) { | |
2028 | switch (param.ext->chunks[i]) { | |
f7010e61 | 2029 | case SCTP_CID_FWD_TSN: |
28aa4c26 XL |
2030 | if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) |
2031 | asoc->peer.prsctp_capable = 1; | |
f7010e61 | 2032 | break; |
2033 | case SCTP_CID_AUTH: | |
2034 | /* if the peer reports AUTH, assume that he | |
2035 | * supports AUTH. | |
2036 | */ | |
b14878cc | 2037 | if (asoc->ep->auth_enable) |
f7010e61 | 2038 | asoc->peer.auth_capable = 1; |
2039 | break; | |
2040 | case SCTP_CID_ASCONF: | |
2041 | case SCTP_CID_ASCONF_ACK: | |
2042 | if (net->sctp.addip_enable) | |
2043 | asoc->peer.asconf_capable = 1; | |
2044 | break; | |
2045 | default: | |
2046 | break; | |
131a47e3 VY |
2047 | } |
2048 | } | |
2049 | } | |
2050 | ||
1da177e4 LT |
2051 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2052 | * | |
2053 | * The Parameter Types are encoded such that the | |
2054 | * highest-order two bits specify the action that must be | |
2055 | * taken if the processing endpoint does not recognize the | |
2056 | * Parameter Type. | |
2057 | * | |
7ab90804 VY |
2058 | * 00 - Stop processing this parameter; do not process any further |
2059 | * parameters within this chunk | |
1da177e4 | 2060 | * |
7ab90804 VY |
2061 | * 01 - Stop processing this parameter, do not process any further |
2062 | * parameters within this chunk, and report the unrecognized | |
2063 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2064 | * |
2065 | * 10 - Skip this parameter and continue processing. | |
2066 | * | |
2067 | * 11 - Skip this parameter and continue processing but | |
2068 | * report the unrecognized parameter in an | |
7ab90804 | 2069 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2070 | * |
2071 | * Return value: | |
7ab90804 VY |
2072 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2073 | * SCTP_IERROR_ERROR - stop and report an error. | |
2074 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2075 | */ |
7ab90804 VY |
2076 | static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, |
2077 | union sctp_params param, | |
2078 | struct sctp_chunk *chunk, | |
2079 | struct sctp_chunk **errp) | |
1da177e4 | 2080 | { |
7ab90804 | 2081 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2082 | |
2083 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2084 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2085 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2086 | break; |
2087 | case SCTP_PARAM_ACTION_SKIP: | |
2088 | break; | |
7ab90804 VY |
2089 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2090 | retval = SCTP_IERROR_ERROR; | |
2091 | /* Fall through */ | |
1da177e4 LT |
2092 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2093 | /* Make an ERROR chunk, preparing enough room for | |
2094 | * returning multiple unknown parameters. | |
2095 | */ | |
2096 | if (NULL == *errp) | |
5fa782c2 | 2097 | *errp = sctp_make_op_error_fixed(asoc, chunk); |
1da177e4 LT |
2098 | |
2099 | if (*errp) { | |
2205a6ea JB |
2100 | if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
2101 | WORD_ROUND(ntohs(param.p->length)))) | |
2102 | sctp_addto_chunk_fixed(*errp, | |
2103 | WORD_ROUND(ntohs(param.p->length)), | |
2104 | param.v); | |
1da177e4 LT |
2105 | } else { |
2106 | /* If there is no memory for generating the ERROR | |
2107 | * report as specified, an ABORT will be triggered | |
2108 | * to the peer and the association won't be | |
2109 | * established. | |
2110 | */ | |
7ab90804 | 2111 | retval = SCTP_IERROR_NOMEM; |
1da177e4 | 2112 | } |
1da177e4 LT |
2113 | break; |
2114 | default: | |
2115 | break; | |
2116 | } | |
2117 | ||
2118 | return retval; | |
2119 | } | |
2120 | ||
7ab90804 | 2121 | /* Verify variable length parameters |
1da177e4 | 2122 | * Return values: |
7ab90804 VY |
2123 | * SCTP_IERROR_ABORT - trigger an ABORT |
2124 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2125 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2126 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2127 | */ |
f53b5b09 | 2128 | static sctp_ierror_t sctp_verify_param(struct net *net, |
b14878cc | 2129 | const struct sctp_endpoint *ep, |
f53b5b09 | 2130 | const struct sctp_association *asoc, |
7ab90804 VY |
2131 | union sctp_params param, |
2132 | sctp_cid_t cid, | |
2133 | struct sctp_chunk *chunk, | |
2134 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2135 | { |
72da7b38 | 2136 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2137 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2138 | __u16 n_elt, id = 0; |
2139 | int i; | |
1da177e4 LT |
2140 | |
2141 | /* FIXME - This routine is not looking at each parameter per the | |
2142 | * chunk type, i.e., unrecognized parameters should be further | |
2143 | * identified based on the chunk id. | |
2144 | */ | |
2145 | ||
2146 | switch (param.p->type) { | |
2147 | case SCTP_PARAM_IPV4_ADDRESS: | |
2148 | case SCTP_PARAM_IPV6_ADDRESS: | |
2149 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2150 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2151 | case SCTP_PARAM_STATE_COOKIE: | |
2152 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2153 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2154 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2155 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2156 | break; |
2157 | ||
131a47e3 | 2158 | case SCTP_PARAM_SUPPORTED_EXT: |
f53b5b09 | 2159 | if (!sctp_verify_ext_param(net, param)) |
d6701191 | 2160 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2161 | break; |
2162 | ||
d6de3097 | 2163 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2164 | if (net->sctp.addip_enable) |
d6de3097 VY |
2165 | break; |
2166 | goto fallthrough; | |
2167 | ||
1da177e4 LT |
2168 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2169 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2170 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2171 | retval = SCTP_IERROR_ABORT; | |
2172 | break; | |
131a47e3 | 2173 | |
1da177e4 | 2174 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2175 | if (ep->prsctp_enable) |
1da177e4 | 2176 | break; |
730fc3d0 VY |
2177 | goto fallthrough; |
2178 | ||
2179 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2180 | if (!ep->auth_enable) |
730fc3d0 VY |
2181 | goto fallthrough; |
2182 | ||
2183 | /* SCTP-AUTH: Secion 6.1 | |
2184 | * If the random number is not 32 byte long the association | |
2185 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2186 | * cause 'Protocol Violation'. | |
2187 | */ | |
2188 | if (SCTP_AUTH_RANDOM_LENGTH != | |
7ab90804 VY |
2189 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { |
2190 | sctp_process_inv_paramlength(asoc, param.p, | |
730fc3d0 | 2191 | chunk, err_chunk); |
7ab90804 VY |
2192 | retval = SCTP_IERROR_ABORT; |
2193 | } | |
730fc3d0 VY |
2194 | break; |
2195 | ||
2196 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2197 | if (!ep->auth_enable) |
730fc3d0 VY |
2198 | goto fallthrough; |
2199 | ||
2200 | /* SCTP-AUTH: Section 3.2 | |
2201 | * The CHUNKS parameter MUST be included once in the INIT or | |
2202 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2203 | * chunks. Its maximum length is 260 bytes. | |
2204 | */ | |
7ab90804 VY |
2205 | if (260 < ntohs(param.p->length)) { |
2206 | sctp_process_inv_paramlength(asoc, param.p, | |
2207 | chunk, err_chunk); | |
2208 | retval = SCTP_IERROR_ABORT; | |
2209 | } | |
730fc3d0 VY |
2210 | break; |
2211 | ||
2212 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2213 | if (!ep->auth_enable) |
72da7b38 WY |
2214 | goto fallthrough; |
2215 | ||
2216 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
2217 | n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; | |
2218 | ||
2219 | /* SCTP-AUTH: Section 6.1 | |
2220 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2221 | * included in the HMAC-ALGO parameter. | |
2222 | */ | |
2223 | for (i = 0; i < n_elt; i++) { | |
2224 | id = ntohs(hmacs->hmac_ids[i]); | |
2225 | ||
2226 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2227 | break; | |
2228 | } | |
2229 | ||
2230 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2231 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2232 | err_chunk); | |
2233 | retval = SCTP_IERROR_ABORT; | |
2234 | } | |
2235 | break; | |
730fc3d0 | 2236 | fallthrough: |
1da177e4 | 2237 | default: |
bb33381d DB |
2238 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2239 | __func__, ntohs(param.p->type), cid); | |
2240 | ||
7ab90804 | 2241 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2242 | break; |
2243 | } | |
2244 | return retval; | |
2245 | } | |
2246 | ||
2247 | /* Verify the INIT packet before we process it. */ | |
b14878cc VY |
2248 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
2249 | const struct sctp_association *asoc, sctp_cid_t cid, | |
2250 | sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, | |
1da177e4 LT |
2251 | struct sctp_chunk **errp) |
2252 | { | |
2253 | union sctp_params param; | |
7613f5fe | 2254 | bool has_cookie = false; |
7ab90804 | 2255 | int result; |
1da177e4 | 2256 | |
7613f5fe DB |
2257 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2258 | * also mandatory, but is not checked here since the valid range | |
2259 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2260 | */ | |
2261 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2262 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2263 | peer_init->init_hdr.init_tag == 0 || | |
2264 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2265 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2266 | |
1da177e4 | 2267 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2268 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2269 | has_cookie = true; | |
2270 | } | |
1da177e4 LT |
2271 | |
2272 | /* There is a possibility that a parameter length was bad and | |
2273 | * in that case we would have stoped walking the parameters. | |
2274 | * The current param.p would point at the bad one. | |
2275 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2276 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2277 | * error handling code build and send the packet. | |
2278 | */ | |
26ac8e5f | 2279 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2280 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2281 | |
2282 | /* The only missing mandatory param possible today is | |
2283 | * the state cookie for an INIT-ACK chunk. | |
2284 | */ | |
7ab90804 VY |
2285 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2286 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2287 | chunk, errp); | |
1da177e4 | 2288 | |
7ab90804 | 2289 | /* Verify all the variable length parameters */ |
1da177e4 | 2290 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2291 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2292 | chunk, errp); | |
7ab90804 | 2293 | switch (result) { |
f7010e61 | 2294 | case SCTP_IERROR_ABORT: |
2295 | case SCTP_IERROR_NOMEM: | |
2296 | return 0; | |
2297 | case SCTP_IERROR_ERROR: | |
2298 | return 1; | |
2299 | case SCTP_IERROR_NO_ERROR: | |
2300 | default: | |
2301 | break; | |
1da177e4 LT |
2302 | } |
2303 | ||
2304 | } /* for (loop through all parameters) */ | |
2305 | ||
2306 | return 1; | |
2307 | } | |
2308 | ||
2309 | /* Unpack the parameters in an INIT packet into an association. | |
2310 | * Returns 0 on failure, else success. | |
2311 | * FIXME: This is an association method. | |
2312 | */ | |
de6becdc | 2313 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2314 | const union sctp_addr *peer_addr, |
dd0fc66f | 2315 | sctp_init_chunk_t *peer_init, gfp_t gfp) |
1da177e4 | 2316 | { |
e1fc3b14 | 2317 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2318 | union sctp_params param; |
2319 | struct sctp_transport *transport; | |
2320 | struct list_head *pos, *temp; | |
de6becdc WY |
2321 | struct sctp_af *af; |
2322 | union sctp_addr addr; | |
1da177e4 | 2323 | char *cookie; |
de6becdc | 2324 | int src_match = 0; |
1da177e4 LT |
2325 | |
2326 | /* We must include the address that the INIT packet came from. | |
2327 | * This is the only address that matters for an INIT packet. | |
2328 | * When processing a COOKIE ECHO, we retrieve the from address | |
2329 | * of the INIT from the cookie. | |
2330 | */ | |
2331 | ||
2332 | /* This implementation defaults to making the first transport | |
2333 | * added as the primary transport. The source address seems to | |
2334 | * be a a better choice than any of the embedded addresses. | |
2335 | */ | |
cb3f837b | 2336 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2337 | goto nomem; |
2338 | ||
2339 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2340 | src_match = 1; | |
1da177e4 LT |
2341 | |
2342 | /* Process the initialization parameters. */ | |
1da177e4 | 2343 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2344 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2345 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2346 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2347 | af->from_addr_param(&addr, param.addr, | |
2348 | chunk->sctp_hdr->source, 0); | |
2349 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2350 | src_match = 1; | |
2351 | } | |
1da177e4 LT |
2352 | |
2353 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2354 | goto clean_up; |
1da177e4 LT |
2355 | } |
2356 | ||
de6becdc WY |
2357 | /* source address of chunk may not match any valid address */ |
2358 | if (!src_match) | |
2359 | goto clean_up; | |
2360 | ||
730fc3d0 VY |
2361 | /* AUTH: After processing the parameters, make sure that we |
2362 | * have all the required info to potentially do authentications. | |
2363 | */ | |
2364 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2365 | !asoc->peer.peer_hmacs)) | |
2366 | asoc->peer.auth_capable = 0; | |
2367 | ||
d6701191 VY |
2368 | /* In a non-backward compatible mode, if the peer claims |
2369 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2370 | * that we MUST ABORT the association. Section 6. The section | |
2371 | * also give us an option to silently ignore the packet, which | |
2372 | * is what we'll do here. | |
6b2f9cb6 | 2373 | */ |
e1fc3b14 | 2374 | if (!net->sctp.addip_noauth && |
73d9c4fd | 2375 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
6b2f9cb6 VY |
2376 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2377 | SCTP_PARAM_DEL_IP | | |
2378 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2379 | asoc->peer.asconf_capable = 0; |
d6701191 | 2380 | goto clean_up; |
6b2f9cb6 VY |
2381 | } |
2382 | ||
3f7a87d2 FF |
2383 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2384 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2385 | transport = list_entry(pos, struct sctp_transport, transports); | |
2386 | if (transport->state == SCTP_UNKNOWN) { | |
2387 | sctp_assoc_rm_peer(asoc, transport); | |
2388 | } | |
2389 | } | |
2390 | ||
1da177e4 LT |
2391 | /* The fixed INIT headers are always in network byte |
2392 | * order. | |
2393 | */ | |
2394 | asoc->peer.i.init_tag = | |
2395 | ntohl(peer_init->init_hdr.init_tag); | |
2396 | asoc->peer.i.a_rwnd = | |
2397 | ntohl(peer_init->init_hdr.a_rwnd); | |
2398 | asoc->peer.i.num_outbound_streams = | |
2399 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2400 | asoc->peer.i.num_inbound_streams = | |
2401 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2402 | asoc->peer.i.initial_tsn = | |
2403 | ntohl(peer_init->init_hdr.initial_tsn); | |
2404 | ||
2405 | /* Apply the upper bounds for output streams based on peer's | |
2406 | * number of inbound streams. | |
2407 | */ | |
2408 | if (asoc->c.sinit_num_ostreams > | |
2409 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2410 | asoc->c.sinit_num_ostreams = | |
2411 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2412 | } | |
2413 | ||
2414 | if (asoc->c.sinit_max_instreams > | |
2415 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2416 | asoc->c.sinit_max_instreams = | |
2417 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2418 | } | |
2419 | ||
2420 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2421 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2422 | ||
2423 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2424 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2425 | ||
2426 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2427 | cookie = asoc->peer.cookie; | |
2428 | if (cookie) { | |
af997d8c | 2429 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2430 | if (!asoc->peer.cookie) |
2431 | goto clean_up; | |
1da177e4 LT |
2432 | } |
2433 | ||
2434 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2435 | * high (for example, implementations MAY use the size of the receiver | |
2436 | * advertised window). | |
2437 | */ | |
9dbc15f0 RD |
2438 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2439 | transports) { | |
1da177e4 LT |
2440 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2441 | } | |
2442 | ||
2443 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2444 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2445 | asoc->peer.i.initial_tsn, gfp)) | |
2446 | goto clean_up; | |
1da177e4 LT |
2447 | |
2448 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2449 | * | |
2450 | * The stream sequence number in all the streams shall start | |
2451 | * from 0 when the association is established. Also, when the | |
2452 | * stream sequence number reaches the value 65535 the next | |
2453 | * stream sequence number shall be set to 0. | |
2454 | */ | |
2455 | ||
3f7a87d2 | 2456 | /* Allocate storage for the negotiated streams if it is not a temporary |
d808ad9a | 2457 | * association. |
1da177e4 LT |
2458 | */ |
2459 | if (!asoc->temp) { | |
1da177e4 LT |
2460 | int error; |
2461 | ||
2462 | asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, | |
2463 | asoc->c.sinit_num_ostreams, gfp); | |
2464 | if (!asoc->ssnmap) | |
2465 | goto clean_up; | |
2466 | ||
07d93967 VY |
2467 | error = sctp_assoc_set_id(asoc, gfp); |
2468 | if (error) | |
1da177e4 | 2469 | goto clean_up; |
1da177e4 LT |
2470 | } |
2471 | ||
2472 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2473 | * | |
2474 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2475 | * remote endpoint it should do the following: | |
2476 | * ... | |
2477 | * A2) A serial number should be assigned to the Chunk. The serial | |
2478 | * number should be a monotonically increasing number. All serial | |
2479 | * numbers are defined to be initialized at the start of the | |
2480 | * association to the same value as the Initial TSN. | |
2481 | */ | |
2482 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2483 | return 1; | |
2484 | ||
2485 | clean_up: | |
2486 | /* Release the transport structures. */ | |
2487 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2488 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2489 | if (transport->state != SCTP_ACTIVE) |
2490 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2491 | } |
3f7a87d2 | 2492 | |
1da177e4 LT |
2493 | nomem: |
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | ||
2498 | /* Update asoc with the option described in param. | |
2499 | * | |
2500 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2501 | * | |
2502 | * asoc is the association to update. | |
2503 | * param is the variable length parameter to use for update. | |
2504 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2505 | * If the current packet is an INIT we want to minimize the amount of | |
2506 | * work we do. In particular, we should not build transport | |
2507 | * structures for the addresses. | |
2508 | */ | |
2509 | static int sctp_process_param(struct sctp_association *asoc, | |
2510 | union sctp_params param, | |
2511 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2512 | gfp_t gfp) |
1da177e4 | 2513 | { |
e7ff4a70 | 2514 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2515 | union sctp_addr addr; |
2516 | int i; | |
2517 | __u16 sat; | |
2518 | int retval = 1; | |
2519 | sctp_scope_t scope; | |
3ef0a25b | 2520 | u32 stale; |
1da177e4 | 2521 | struct sctp_af *af; |
d6de3097 VY |
2522 | union sctp_addr_param *addr_param; |
2523 | struct sctp_transport *t; | |
b14878cc | 2524 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
2525 | |
2526 | /* We maintain all INIT parameters in network byte order all the | |
2527 | * time. This allows us to not worry about whether the parameters | |
2528 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2529 | */ | |
2530 | switch (param.p->type) { | |
2531 | case SCTP_PARAM_IPV6_ADDRESS: | |
2532 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2533 | break; | |
7dab83de VY |
2534 | goto do_addr_param; |
2535 | ||
1da177e4 | 2536 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2537 | /* v4 addresses are not allowed on v6-only socket */ |
2538 | if (ipv6_only_sock(asoc->base.sk)) | |
2539 | break; | |
2540 | do_addr_param: | |
1da177e4 | 2541 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2542 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2543 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2544 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2545 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2546 | return 0; |
2547 | break; | |
2548 | ||
2549 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2550 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2551 | break; |
2552 | ||
2553 | stale = ntohl(param.life->lifespan_increment); | |
2554 | ||
2555 | /* Suggested Cookie Life span increment's unit is msec, | |
2556 | * (1/1000sec). | |
2557 | */ | |
52db882f | 2558 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2559 | break; |
2560 | ||
2561 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2562 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2563 | break; |
2564 | ||
2565 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2566 | /* Turn off the default values first so we'll know which | |
2567 | * ones are really set by the peer. | |
2568 | */ | |
2569 | asoc->peer.ipv4_address = 0; | |
2570 | asoc->peer.ipv6_address = 0; | |
2571 | ||
140ee960 GJ |
2572 | /* Assume that peer supports the address family |
2573 | * by which it sends a packet. | |
2574 | */ | |
2575 | if (peer_addr->sa.sa_family == AF_INET6) | |
2576 | asoc->peer.ipv6_address = 1; | |
2577 | else if (peer_addr->sa.sa_family == AF_INET) | |
2578 | asoc->peer.ipv4_address = 1; | |
2579 | ||
1da177e4 LT |
2580 | /* Cycle through address types; avoid divide by 0. */ |
2581 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2582 | if (sat) | |
2583 | sat /= sizeof(__u16); | |
2584 | ||
2585 | for (i = 0; i < sat; ++i) { | |
2586 | switch (param.sat->types[i]) { | |
2587 | case SCTP_PARAM_IPV4_ADDRESS: | |
2588 | asoc->peer.ipv4_address = 1; | |
2589 | break; | |
2590 | ||
2591 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2592 | if (PF_INET6 == asoc->base.sk->sk_family) |
2593 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2594 | break; |
2595 | ||
2596 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2597 | asoc->peer.hostname_address = 1; | |
2598 | break; | |
2599 | ||
2600 | default: /* Just ignore anything else. */ | |
2601 | break; | |
3ff50b79 | 2602 | } |
1da177e4 LT |
2603 | } |
2604 | break; | |
2605 | ||
2606 | case SCTP_PARAM_STATE_COOKIE: | |
2607 | asoc->peer.cookie_len = | |
2608 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); | |
2609 | asoc->peer.cookie = param.cookie->body; | |
2610 | break; | |
2611 | ||
2612 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2613 | /* Would be odd to receive, but it causes no problems. */ | |
2614 | break; | |
2615 | ||
2616 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2617 | /* Rejected during verify stage. */ | |
2618 | break; | |
2619 | ||
2620 | case SCTP_PARAM_ECN_CAPABLE: | |
2621 | asoc->peer.ecn_capable = 1; | |
2622 | break; | |
2623 | ||
0f3fffd8 | 2624 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2625 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2626 | break; |
2627 | ||
d6de3097 | 2628 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2629 | if (!net->sctp.addip_enable) |
0ef46e28 VY |
2630 | goto fall_through; |
2631 | ||
d6de3097 VY |
2632 | addr_param = param.v + sizeof(sctp_addip_param_t); |
2633 | ||
cfbf654e | 2634 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2635 | if (af == NULL) |
2636 | break; | |
2637 | ||
d6de3097 VY |
2638 | af->from_addr_param(&addr, addr_param, |
2639 | htons(asoc->peer.port), 0); | |
2640 | ||
2641 | /* if the address is invalid, we can't process it. | |
2642 | * XXX: see spec for what to do. | |
2643 | */ | |
2644 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2645 | break; | |
2646 | ||
2647 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2648 | if (!t) | |
2649 | break; | |
2650 | ||
2651 | sctp_assoc_set_primary(asoc, t); | |
2652 | break; | |
2653 | ||
131a47e3 VY |
2654 | case SCTP_PARAM_SUPPORTED_EXT: |
2655 | sctp_process_ext_param(asoc, param); | |
2656 | break; | |
2657 | ||
1da177e4 | 2658 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2659 | if (asoc->prsctp_enable) { |
1da177e4 LT |
2660 | asoc->peer.prsctp_capable = 1; |
2661 | break; | |
2662 | } | |
d808ad9a | 2663 | /* Fall Through */ |
730fc3d0 VY |
2664 | goto fall_through; |
2665 | ||
2666 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2667 | if (!ep->auth_enable) |
730fc3d0 VY |
2668 | goto fall_through; |
2669 | ||
2670 | /* Save peer's random parameter */ | |
2671 | asoc->peer.peer_random = kmemdup(param.p, | |
2672 | ntohs(param.p->length), gfp); | |
2673 | if (!asoc->peer.peer_random) { | |
2674 | retval = 0; | |
2675 | break; | |
2676 | } | |
2677 | break; | |
2678 | ||
2679 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2680 | if (!ep->auth_enable) |
730fc3d0 VY |
2681 | goto fall_through; |
2682 | ||
2683 | /* Save peer's HMAC list */ | |
2684 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2685 | ntohs(param.p->length), gfp); | |
2686 | if (!asoc->peer.peer_hmacs) { | |
2687 | retval = 0; | |
2688 | break; | |
2689 | } | |
2690 | ||
2691 | /* Set the default HMAC the peer requested*/ | |
2692 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2693 | break; | |
2694 | ||
2695 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2696 | if (!ep->auth_enable) |
730fc3d0 VY |
2697 | goto fall_through; |
2698 | ||
2699 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2700 | ntohs(param.p->length), gfp); | |
2701 | if (!asoc->peer.peer_chunks) | |
2702 | retval = 0; | |
2703 | break; | |
2704 | fall_through: | |
1da177e4 LT |
2705 | default: |
2706 | /* Any unrecognized parameters should have been caught | |
2707 | * and handled by sctp_verify_param() which should be | |
2708 | * called prior to this routine. Simply log the error | |
2709 | * here. | |
2710 | */ | |
bb33381d DB |
2711 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2712 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2713 | break; |
3ff50b79 | 2714 | } |
1da177e4 LT |
2715 | |
2716 | return retval; | |
2717 | } | |
2718 | ||
2719 | /* Select a new verification tag. */ | |
2720 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2721 | { | |
2722 | /* I believe that this random number generator complies with RFC1750. | |
2723 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2724 | */ | |
2725 | __u32 x; | |
2726 | ||
2727 | do { | |
2728 | get_random_bytes(&x, sizeof(__u32)); | |
2729 | } while (x == 0); | |
2730 | ||
2731 | return x; | |
2732 | } | |
2733 | ||
2734 | /* Select an initial TSN to send during startup. */ | |
2735 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2736 | { | |
2737 | __u32 retval; | |
2738 | ||
2739 | get_random_bytes(&retval, sizeof(__u32)); | |
2740 | return retval; | |
2741 | } | |
2742 | ||
2743 | /* | |
2744 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2745 | * 0 1 2 3 | |
2746 | * 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 | |
2747 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2748 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2749 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2750 | * | Serial Number | | |
2751 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2752 | * | Address Parameter | | |
2753 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2754 | * | ASCONF Parameter #1 | | |
2755 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2756 | * \ \ | |
2757 | * / .... / | |
2758 | * \ \ | |
2759 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2760 | * | ASCONF Parameter #N | | |
2761 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2762 | * | |
d808ad9a | 2763 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2764 | */ |
2765 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2766 | union sctp_addr *addr, | |
2767 | int vparam_len) | |
2768 | { | |
2769 | sctp_addiphdr_t asconf; | |
2770 | struct sctp_chunk *retval; | |
2771 | int length = sizeof(asconf) + vparam_len; | |
2772 | union sctp_addr_param addrparam; | |
2773 | int addrlen; | |
2774 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2775 | ||
2776 | addrlen = af->to_addr_param(addr, &addrparam); | |
2777 | if (!addrlen) | |
2778 | return NULL; | |
2779 | length += addrlen; | |
2780 | ||
2781 | /* Create the chunk. */ | |
cea8768f MRL |
2782 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2783 | GFP_ATOMIC); | |
1da177e4 LT |
2784 | if (!retval) |
2785 | return NULL; | |
2786 | ||
2787 | asconf.serial = htonl(asoc->addip_serial++); | |
2788 | ||
2789 | retval->subh.addip_hdr = | |
2790 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2791 | retval->param_hdr.v = | |
2792 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2793 | ||
2794 | return retval; | |
2795 | } | |
2796 | ||
2797 | /* ADDIP | |
2798 | * 3.2.1 Add IP Address | |
2799 | * 0 1 2 3 | |
2800 | * 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 | |
2801 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2802 | * | Type = 0xC001 | Length = Variable | | |
2803 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2804 | * | ASCONF-Request Correlation ID | | |
2805 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2806 | * | Address Parameter | | |
2807 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2808 | * | |
2809 | * 3.2.2 Delete IP Address | |
2810 | * 0 1 2 3 | |
2811 | * 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 | |
2812 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2813 | * | Type = 0xC002 | Length = Variable | | |
2814 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2815 | * | ASCONF-Request Correlation ID | | |
2816 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2817 | * | Address Parameter | | |
2818 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2819 | * | |
2820 | */ | |
2821 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
2822 | union sctp_addr *laddr, | |
2823 | struct sockaddr *addrs, | |
2824 | int addrcnt, | |
dbc16db1 | 2825 | __be16 flags) |
1da177e4 LT |
2826 | { |
2827 | sctp_addip_param_t param; | |
2828 | struct sctp_chunk *retval; | |
2829 | union sctp_addr_param addr_param; | |
2830 | union sctp_addr *addr; | |
2831 | void *addr_buf; | |
2832 | struct sctp_af *af; | |
2833 | int paramlen = sizeof(param); | |
2834 | int addr_param_len = 0; | |
2835 | int totallen = 0; | |
2836 | int i; | |
8a07eb0a | 2837 | int del_pickup = 0; |
1da177e4 LT |
2838 | |
2839 | /* Get total length of all the address parameters. */ | |
2840 | addr_buf = addrs; | |
2841 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2842 | addr = addr_buf; |
1da177e4 LT |
2843 | af = sctp_get_af_specific(addr->v4.sin_family); |
2844 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2845 | ||
2846 | totallen += paramlen; | |
2847 | totallen += addr_param_len; | |
2848 | ||
2849 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2850 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2851 | /* reuse the parameter length from the same scope one */ | |
2852 | totallen += paramlen; | |
2853 | totallen += addr_param_len; | |
2854 | del_pickup = 1; | |
bb33381d DB |
2855 | |
2856 | pr_debug("%s: picked same-scope del_pending addr, " | |
2857 | "totallen for all addresses is %d\n", | |
2858 | __func__, totallen); | |
8a07eb0a | 2859 | } |
1da177e4 LT |
2860 | } |
2861 | ||
2862 | /* Create an asconf chunk with the required length. */ | |
2863 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2864 | if (!retval) | |
2865 | return NULL; | |
2866 | ||
2867 | /* Add the address parameters to the asconf chunk. */ | |
2868 | addr_buf = addrs; | |
2869 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2870 | addr = addr_buf; |
1da177e4 LT |
2871 | af = sctp_get_af_specific(addr->v4.sin_family); |
2872 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2873 | param.param_hdr.type = flags; | |
2874 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2875 | param.crr_id = i; | |
2876 | ||
2877 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2878 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2879 | ||
2880 | addr_buf += af->sockaddr_len; | |
2881 | } | |
8a07eb0a MH |
2882 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2883 | addr = asoc->asconf_addr_del_pending; | |
2884 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2885 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2886 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2887 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
2888 | param.crr_id = i; | |
2889 | ||
2890 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2891 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2892 | } | |
1da177e4 LT |
2893 | return retval; |
2894 | } | |
2895 | ||
2896 | /* ADDIP | |
2897 | * 3.2.4 Set Primary IP Address | |
2898 | * 0 1 2 3 | |
2899 | * 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 | |
2900 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2901 | * | Type =0xC004 | Length = Variable | | |
2902 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2903 | * | ASCONF-Request Correlation ID | | |
2904 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2905 | * | Address Parameter | | |
2906 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2907 | * | |
d808ad9a | 2908 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2909 | */ |
2910 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2911 | union sctp_addr *addr) | |
2912 | { | |
2913 | sctp_addip_param_t param; | |
2914 | struct sctp_chunk *retval; | |
2915 | int len = sizeof(param); | |
2916 | union sctp_addr_param addrparam; | |
2917 | int addrlen; | |
2918 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2919 | ||
2920 | addrlen = af->to_addr_param(addr, &addrparam); | |
2921 | if (!addrlen) | |
2922 | return NULL; | |
2923 | len += addrlen; | |
2924 | ||
2925 | /* Create the chunk and make asconf header. */ | |
2926 | retval = sctp_make_asconf(asoc, addr, len); | |
2927 | if (!retval) | |
2928 | return NULL; | |
2929 | ||
2930 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2931 | param.param_hdr.length = htons(len); | |
2932 | param.crr_id = 0; | |
2933 | ||
2934 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2935 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2936 | ||
2937 | return retval; | |
2938 | } | |
2939 | ||
2940 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2941 | * 0 1 2 3 | |
2942 | * 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 | |
2943 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2944 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2945 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2946 | * | Serial Number | | |
2947 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2948 | * | ASCONF Parameter Response#1 | | |
2949 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2950 | * \ \ | |
2951 | * / .... / | |
2952 | * \ \ | |
2953 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2954 | * | ASCONF Parameter Response#N | | |
2955 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2956 | * | |
d808ad9a | 2957 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2958 | */ |
2959 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2960 | __u32 serial, int vparam_len) | |
2961 | { | |
2962 | sctp_addiphdr_t asconf; | |
2963 | struct sctp_chunk *retval; | |
2964 | int length = sizeof(asconf) + vparam_len; | |
2965 | ||
2966 | /* Create the chunk. */ | |
cea8768f MRL |
2967 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2968 | GFP_ATOMIC); | |
1da177e4 LT |
2969 | if (!retval) |
2970 | return NULL; | |
2971 | ||
2972 | asconf.serial = htonl(serial); | |
2973 | ||
2974 | retval->subh.addip_hdr = | |
2975 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2976 | ||
2977 | return retval; | |
2978 | } | |
2979 | ||
2980 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2981 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
dbc16db1 | 2982 | __be16 err_code, sctp_addip_param_t *asconf_param) |
1da177e4 LT |
2983 | { |
2984 | sctp_addip_param_t ack_param; | |
2985 | sctp_errhdr_t err_param; | |
2986 | int asconf_param_len = 0; | |
2987 | int err_param_len = 0; | |
dbc16db1 | 2988 | __be16 response_type; |
1da177e4 LT |
2989 | |
2990 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2991 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2992 | } else { | |
2993 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2994 | err_param_len = sizeof(err_param); | |
2995 | if (asconf_param) | |
2996 | asconf_param_len = | |
2997 | ntohs(asconf_param->param_hdr.length); | |
2998 | } | |
2999 | ||
d808ad9a | 3000 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
3001 | ack_param.param_hdr.type = response_type; |
3002 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
3003 | err_param_len + | |
3004 | asconf_param_len); | |
3005 | ack_param.crr_id = crr_id; | |
3006 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
3007 | ||
3008 | if (SCTP_ERROR_NO_ERROR == err_code) | |
3009 | return; | |
3010 | ||
3011 | /* Add Error Cause parameter. */ | |
3012 | err_param.cause = err_code; | |
3013 | err_param.length = htons(err_param_len + asconf_param_len); | |
3014 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
3015 | ||
3016 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3017 | if (asconf_param) | |
3018 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3019 | } | |
3020 | ||
3021 | /* Process a asconf parameter. */ | |
dbc16db1 | 3022 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
1da177e4 LT |
3023 | struct sctp_chunk *asconf, |
3024 | sctp_addip_param_t *asconf_param) | |
3025 | { | |
3026 | struct sctp_transport *peer; | |
3027 | struct sctp_af *af; | |
3028 | union sctp_addr addr; | |
1da177e4 | 3029 | union sctp_addr_param *addr_param; |
5f242a13 | 3030 | |
ea110733 | 3031 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
c1cc678a | 3032 | |
44e65c1e WY |
3033 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3034 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3035 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3036 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3037 | ||
6a435732 | 3038 | switch (addr_param->p.type) { |
c4492586 WY |
3039 | case SCTP_PARAM_IPV6_ADDRESS: |
3040 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3041 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3042 | break; |
3043 | case SCTP_PARAM_IPV4_ADDRESS: | |
3044 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3045 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3046 | break; |
3047 | default: | |
945e5abc | 3048 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3049 | } |
3050 | ||
6a435732 | 3051 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3052 | if (unlikely(!af)) |
945e5abc | 3053 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3054 | |
dd86d136 | 3055 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3056 | |
3057 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3058 | * or multicast address. | |
3059 | * (note: wildcard is permitted and requires special handling so | |
3060 | * make sure we check for that) | |
3061 | */ | |
3062 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3063 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3064 | |
1da177e4 LT |
3065 | switch (asconf_param->param_hdr.type) { |
3066 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3067 | /* Section 4.2.1: |
3068 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3069 | * address of the packet MUST be added. | |
3070 | */ | |
3071 | if (af->is_any(&addr)) | |
3072 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3073 | ||
1da177e4 | 3074 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3075 | * request and does not have the local resources to add this |
3076 | * new address to the association, it MUST return an Error | |
3077 | * Cause TLV set to the new error code 'Operation Refused | |
3078 | * Due to Resource Shortage'. | |
3079 | */ | |
1da177e4 | 3080 | |
dd86d136 | 3081 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3082 | if (!peer) |
3083 | return SCTP_ERROR_RSRC_LOW; | |
3084 | ||
3085 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3086 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3087 | asoc->new_transport = peer; |
1da177e4 LT |
3088 | break; |
3089 | case SCTP_PARAM_DEL_IP: | |
3090 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3091 | * last remaining IP address of a peer endpoint, the receiver |
3092 | * MUST send an Error Cause TLV with the error cause set to the | |
3093 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3094 | */ | |
42e30bf3 | 3095 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3096 | return SCTP_ERROR_DEL_LAST_IP; |
3097 | ||
3098 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3099 | * address which is also the source address of the IP packet | |
3100 | * which contained the ASCONF chunk, the receiver MUST reject | |
3101 | * this request. To reject the request the receiver MUST send | |
3102 | * an Error Cause TLV set to the new error code 'Request to | |
3103 | * Delete Source IP Address' | |
3104 | */ | |
b1364104 | 3105 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3106 | return SCTP_ERROR_DEL_SRC_IP; |
3107 | ||
42e30bf3 VY |
3108 | /* Section 4.2.2 |
3109 | * If the address 0.0.0.0 or ::0 is provided, all | |
3110 | * addresses of the peer except the source address of the | |
3111 | * packet MUST be deleted. | |
3112 | */ | |
3113 | if (af->is_any(&addr)) { | |
3114 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3115 | sctp_assoc_del_nonprimary_peers(asoc, | |
3116 | asconf->transport); | |
7c5a9461 | 3117 | return SCTP_ERROR_NO_ERROR; |
3118 | } | |
3119 | ||
3120 | /* If the address is not part of the association, the | |
3121 | * ASCONF-ACK with Error Cause Indication Parameter | |
3122 | * which including cause of Unresolvable Address should | |
3123 | * be sent. | |
3124 | */ | |
3125 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3126 | if (!peer) | |
3127 | return SCTP_ERROR_DNS_FAILED; | |
3128 | ||
3129 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3130 | break; |
3131 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3132 | /* ADDIP Section 4.2.4 |
3133 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3134 | * MAY mark the source address of the packet as its | |
3135 | * primary. | |
3136 | */ | |
3137 | if (af->is_any(&addr)) | |
3138 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3139 | ||
dd86d136 | 3140 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3141 | if (!peer) |
945e5abc | 3142 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3143 | |
3144 | sctp_assoc_set_primary(asoc, peer); | |
3145 | break; | |
1da177e4 LT |
3146 | } |
3147 | ||
3148 | return SCTP_ERROR_NO_ERROR; | |
3149 | } | |
3150 | ||
9de7922b DB |
3151 | /* Verify the ASCONF packet before we process it. */ |
3152 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3153 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3154 | struct sctp_paramhdr **errp) | |
3155 | { | |
3156 | sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; | |
6f4c618d | 3157 | union sctp_params param; |
9de7922b | 3158 | bool addr_param_seen = false; |
6f4c618d | 3159 | |
9de7922b DB |
3160 | sctp_walk_params(param, addip, addip_hdr.params) { |
3161 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3162 | |
9de7922b | 3163 | *errp = param.p; |
6f4c618d | 3164 | switch (param.p->type) { |
9de7922b DB |
3165 | case SCTP_PARAM_ERR_CAUSE: |
3166 | break; | |
3167 | case SCTP_PARAM_IPV4_ADDRESS: | |
3168 | if (length != sizeof(sctp_ipv4addr_param_t)) | |
3169 | return false; | |
ce7b4ccc | 3170 | /* ensure there is only one addr param and it's in the |
3171 | * beginning of addip_hdr params, or we reject it. | |
3172 | */ | |
3173 | if (param.v != addip->addip_hdr.params) | |
3174 | return false; | |
9de7922b DB |
3175 | addr_param_seen = true; |
3176 | break; | |
3177 | case SCTP_PARAM_IPV6_ADDRESS: | |
3178 | if (length != sizeof(sctp_ipv6addr_param_t)) | |
3179 | return false; | |
ce7b4ccc | 3180 | if (param.v != addip->addip_hdr.params) |
3181 | return false; | |
9de7922b DB |
3182 | addr_param_seen = true; |
3183 | break; | |
6f4c618d WY |
3184 | case SCTP_PARAM_ADD_IP: |
3185 | case SCTP_PARAM_DEL_IP: | |
3186 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3187 | /* In ASCONF chunks, these need to be first. */ |
3188 | if (addr_param_needed && !addr_param_seen) | |
3189 | return false; | |
3190 | length = ntohs(param.addip->param_hdr.length); | |
3191 | if (length < sizeof(sctp_addip_param_t) + | |
3192 | sizeof(sctp_paramhdr_t)) | |
3193 | return false; | |
6f4c618d WY |
3194 | break; |
3195 | case SCTP_PARAM_SUCCESS_REPORT: | |
3196 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
3197 | if (length != sizeof(sctp_addip_param_t)) | |
9de7922b | 3198 | return false; |
6f4c618d WY |
3199 | break; |
3200 | default: | |
9de7922b DB |
3201 | /* This is unkown to us, reject! */ |
3202 | return false; | |
6f4c618d | 3203 | } |
6f4c618d WY |
3204 | } |
3205 | ||
9de7922b DB |
3206 | /* Remaining sanity checks. */ |
3207 | if (addr_param_needed && !addr_param_seen) | |
3208 | return false; | |
3209 | if (!addr_param_needed && addr_param_seen) | |
3210 | return false; | |
3211 | if (param.v != chunk->chunk_end) | |
3212 | return false; | |
6f4c618d | 3213 | |
9de7922b | 3214 | return true; |
6f4c618d WY |
3215 | } |
3216 | ||
d808ad9a | 3217 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3218 | * return an ASCONF_ACK chunk to be sent in response. |
3219 | */ | |
3220 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3221 | struct sctp_chunk *asconf) | |
3222 | { | |
9de7922b DB |
3223 | sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; |
3224 | bool all_param_pass = true; | |
3225 | union sctp_params param; | |
1da177e4 LT |
3226 | sctp_addiphdr_t *hdr; |
3227 | union sctp_addr_param *addr_param; | |
3228 | sctp_addip_param_t *asconf_param; | |
3229 | struct sctp_chunk *asconf_ack; | |
dbc16db1 | 3230 | __be16 err_code; |
1da177e4 | 3231 | int length = 0; |
f3830ccc | 3232 | int chunk_len; |
1da177e4 | 3233 | __u32 serial; |
1da177e4 | 3234 | |
f3830ccc | 3235 | chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); |
1da177e4 LT |
3236 | hdr = (sctp_addiphdr_t *)asconf->skb->data; |
3237 | serial = ntohl(hdr->serial); | |
3238 | ||
d808ad9a | 3239 | /* Skip the addiphdr and store a pointer to address parameter. */ |
1da177e4 LT |
3240 | length = sizeof(sctp_addiphdr_t); |
3241 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
3242 | chunk_len -= length; | |
3243 | ||
3244 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3245 | * asconf parameter. |
d808ad9a | 3246 | */ |
6a435732 | 3247 | length = ntohs(addr_param->p.length); |
ea110733 | 3248 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3249 | chunk_len -= length; |
3250 | ||
d808ad9a | 3251 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3252 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3253 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3254 | * parameters. |
1da177e4 | 3255 | */ |
2cab86be | 3256 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3257 | if (!asconf_ack) |
3258 | goto done; | |
3259 | ||
3260 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3261 | sctp_walk_params(param, addip, addip_hdr.params) { |
3262 | /* Skip preceeding address parameters. */ | |
3263 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3264 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3265 | continue; | |
3266 | ||
1da177e4 | 3267 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3268 | param.addip); |
1da177e4 LT |
3269 | /* ADDIP 4.1 A7) |
3270 | * If an error response is received for a TLV parameter, | |
3271 | * all TLVs with no response before the failed TLV are | |
3272 | * considered successful if not reported. All TLVs after | |
3273 | * the failed response are considered unsuccessful unless | |
3274 | * a specific success indication is present for the parameter. | |
3275 | */ | |
9de7922b DB |
3276 | if (err_code != SCTP_ERROR_NO_ERROR) |
3277 | all_param_pass = false; | |
1da177e4 | 3278 | if (!all_param_pass) |
9de7922b DB |
3279 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3280 | err_code, param.addip); | |
1da177e4 LT |
3281 | |
3282 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3283 | * an IP address sends an 'Out of Resource' in its response, it | |
3284 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3285 | * in the ASCONF. |
1da177e4 | 3286 | */ |
9de7922b | 3287 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3288 | goto done; |
1da177e4 | 3289 | } |
1da177e4 LT |
3290 | done: |
3291 | asoc->peer.addip_serial++; | |
3292 | ||
3293 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3294 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3295 | */ |
3296 | if (asconf_ack) { | |
1da177e4 | 3297 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3298 | list_add_tail(&asconf_ack->transmitted_list, |
3299 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3300 | } |
3301 | ||
3302 | return asconf_ack; | |
3303 | } | |
3304 | ||
3305 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3306 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
1da177e4 LT |
3307 | sctp_addip_param_t *asconf_param) |
3308 | { | |
3309 | struct sctp_af *af; | |
3310 | union sctp_addr addr; | |
3311 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; | |
3312 | union sctp_addr_param *addr_param; | |
1da177e4 | 3313 | struct sctp_transport *transport; |
dc022a98 | 3314 | struct sctp_sockaddr_entry *saddr; |
1da177e4 | 3315 | |
ea110733 | 3316 | addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); |
1da177e4 LT |
3317 | |
3318 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3319 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3320 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3321 | |
3322 | switch (asconf_param->param_hdr.type) { | |
3323 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3324 | /* This is always done in BH context with a socket lock |
3325 | * held, so the list can not change. | |
3326 | */ | |
0ed90fb0 | 3327 | local_bh_disable(); |
559cf710 | 3328 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3329 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3330 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3331 | } |
0ed90fb0 | 3332 | local_bh_enable(); |
3cd9749c WY |
3333 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3334 | transports) { | |
3cd9749c | 3335 | dst_release(transport->dst); |
c6ef006b | 3336 | transport->dst = NULL; |
3cd9749c | 3337 | } |
1da177e4 LT |
3338 | break; |
3339 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3340 | local_bh_disable(); |
425e0f68 | 3341 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3342 | if (asoc->asconf_addr_del_pending != NULL && |
3343 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3344 | kfree(asoc->asconf_addr_del_pending); | |
3345 | asoc->asconf_addr_del_pending = NULL; | |
3346 | } | |
0ed90fb0 | 3347 | local_bh_enable(); |
9dbc15f0 RD |
3348 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3349 | transports) { | |
dc022a98 | 3350 | dst_release(transport->dst); |
c6ef006b | 3351 | transport->dst = NULL; |
1da177e4 LT |
3352 | } |
3353 | break; | |
3354 | default: | |
3355 | break; | |
3356 | } | |
1da177e4 LT |
3357 | } |
3358 | ||
3359 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3360 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3361 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3362 | * ADDIP 4.1 |
3363 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3364 | * response before the failed TLV are considered successful if not reported. | |
3365 | * All TLVs after the failed response are considered unsuccessful unless a | |
3366 | * specific success indication is present for the parameter. | |
3367 | */ | |
dbc16db1 | 3368 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
1da177e4 LT |
3369 | sctp_addip_param_t *asconf_param, |
3370 | int no_err) | |
3371 | { | |
3372 | sctp_addip_param_t *asconf_ack_param; | |
3373 | sctp_errhdr_t *err_param; | |
3374 | int length; | |
f3830ccc | 3375 | int asconf_ack_len; |
dbc16db1 | 3376 | __be16 err_code; |
1da177e4 LT |
3377 | |
3378 | if (no_err) | |
3379 | err_code = SCTP_ERROR_NO_ERROR; | |
3380 | else | |
3381 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3382 | ||
f3830ccc WY |
3383 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
3384 | sizeof(sctp_chunkhdr_t); | |
3385 | ||
1da177e4 LT |
3386 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3387 | * the first asconf_ack parameter. | |
d808ad9a | 3388 | */ |
1da177e4 LT |
3389 | length = sizeof(sctp_addiphdr_t); |
3390 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + | |
3391 | length); | |
3392 | asconf_ack_len -= length; | |
3393 | ||
3394 | while (asconf_ack_len > 0) { | |
3395 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3396 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3397 | case SCTP_PARAM_SUCCESS_REPORT: |
3398 | return SCTP_ERROR_NO_ERROR; | |
3399 | case SCTP_PARAM_ERR_CAUSE: | |
3400 | length = sizeof(sctp_addip_param_t); | |
ea110733 | 3401 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3402 | asconf_ack_len -= length; |
3403 | if (asconf_ack_len > 0) | |
3404 | return err_param->cause; | |
3405 | else | |
3406 | return SCTP_ERROR_INV_PARAM; | |
3407 | break; | |
3408 | default: | |
3409 | return SCTP_ERROR_INV_PARAM; | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3414 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3415 | asconf_ack_len -= length; |
3416 | } | |
3417 | ||
3418 | return err_code; | |
3419 | } | |
3420 | ||
3421 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3422 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3423 | struct sctp_chunk *asconf_ack) | |
3424 | { | |
3425 | struct sctp_chunk *asconf = asoc->addip_last_asconf; | |
3426 | union sctp_addr_param *addr_param; | |
3427 | sctp_addip_param_t *asconf_param; | |
3428 | int length = 0; | |
3429 | int asconf_len = asconf->skb->len; | |
3430 | int all_param_pass = 0; | |
3431 | int no_err = 1; | |
3432 | int retval = 0; | |
dbc16db1 | 3433 | __be16 err_code = SCTP_ERROR_NO_ERROR; |
1da177e4 LT |
3434 | |
3435 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3436 | * a pointer to address parameter. | |
d808ad9a | 3437 | */ |
1da177e4 LT |
3438 | length = sizeof(sctp_addip_chunk_t); |
3439 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); | |
3440 | asconf_len -= length; | |
3441 | ||
3442 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3443 | * pointer to the first asconf parameter. |
d808ad9a | 3444 | */ |
6a435732 | 3445 | length = ntohs(addr_param->p.length); |
ea110733 | 3446 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3447 | asconf_len -= length; |
3448 | ||
3449 | /* ADDIP 4.1 | |
3450 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3451 | * failures are indicated, then all request(s) are considered | |
3452 | * successful. | |
3453 | */ | |
3454 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) | |
3455 | all_param_pass = 1; | |
3456 | ||
3457 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3458 | while (asconf_len > 0) { | |
3459 | if (all_param_pass) | |
3460 | err_code = SCTP_ERROR_NO_ERROR; | |
3461 | else { | |
3462 | err_code = sctp_get_asconf_response(asconf_ack, | |
3463 | asconf_param, | |
3464 | no_err); | |
3465 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3466 | no_err = 0; | |
3467 | } | |
3468 | ||
3469 | switch (err_code) { | |
3470 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3471 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3472 | break; |
3473 | ||
3474 | case SCTP_ERROR_RSRC_LOW: | |
3475 | retval = 1; | |
3476 | break; | |
3477 | ||
a987f762 | 3478 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3479 | /* Disable sending this type of asconf parameter in |
3480 | * future. | |
d808ad9a | 3481 | */ |
1da177e4 LT |
3482 | asoc->peer.addip_disabled_mask |= |
3483 | asconf_param->param_hdr.type; | |
3484 | break; | |
3485 | ||
3486 | case SCTP_ERROR_REQ_REFUSED: | |
3487 | case SCTP_ERROR_DEL_LAST_IP: | |
3488 | case SCTP_ERROR_DEL_SRC_IP: | |
3489 | default: | |
3490 | break; | |
3491 | } | |
3492 | ||
3493 | /* Skip the processed asconf parameter and move to the next | |
3494 | * one. | |
d808ad9a | 3495 | */ |
1da177e4 | 3496 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3497 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3498 | asconf_len -= length; |
3499 | } | |
3500 | ||
ddc4bbee | 3501 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3502 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3503 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3504 | } | |
8a07eb0a | 3505 | |
1da177e4 | 3506 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3507 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3508 | sctp_chunk_free(asconf); |
3509 | asoc->addip_last_asconf = NULL; | |
3510 | ||
1da177e4 LT |
3511 | return retval; |
3512 | } | |
3513 | ||
d808ad9a | 3514 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3515 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3516 | __u32 new_cum_tsn, size_t nstreams, | |
3517 | struct sctp_fwdtsn_skip *skiplist) | |
3518 | { | |
3519 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3520 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3521 | struct sctp_fwdtsn_skip skip; |
3522 | size_t hint; | |
3523 | int i; | |
3524 | ||
3525 | hint = (nstreams + 1) * sizeof(__u32); | |
3526 | ||
cea8768f | 3527 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3528 | |
3529 | if (!retval) | |
3530 | return NULL; | |
3531 | ||
1da177e4 LT |
3532 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3533 | retval->subh.fwdtsn_hdr = | |
3534 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3535 | ||
3536 | for (i = 0; i < nstreams; i++) { | |
3537 | skip.stream = skiplist[i].stream; | |
3538 | skip.ssn = skiplist[i].ssn; | |
3539 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3540 | } | |
3541 | ||
3542 | return retval; | |
3543 | } |