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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001-2002 Intel Corp. | |
7 | * | |
60c778b2 | 8 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
9 | * |
10 | * These functions work with the state functions in sctp_sm_statefuns.c | |
11 | * to implement the state operations. These functions implement the | |
12 | * steps which require modifying existing data structures. | |
13 | * | |
1da177e4 LT |
14 | * Please send any bug reports or fixes you make to the |
15 | * email address(es): | |
91705c61 | 16 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 17 | * |
1da177e4 LT |
18 | * Written or modified by: |
19 | * La Monte H.P. Yarroll <piggy@acm.org> | |
20 | * Karl Knutson <karl@athena.chicago.il.us> | |
21 | * C. Robin <chris@hundredacre.ac.uk> | |
22 | * Jon Grimm <jgrimm@us.ibm.com> | |
23 | * Xingang Guo <xingang.guo@intel.com> | |
24 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
25 | * Sridhar Samudrala <sri@us.ibm.com> | |
26 | * Daisy Chang <daisyc@us.ibm.com> | |
27 | * Ardelle Fan <ardelle.fan@intel.com> | |
28 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
29 | */ |
30 | ||
145ce502 JP |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5821c769 | 33 | #include <crypto/hash.h> |
1da177e4 LT |
34 | #include <linux/types.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/ip.h> | |
37 | #include <linux/ipv6.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/inet.h> | |
ebc3bbcf | 40 | #include <linux/scatterlist.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | #include <net/sock.h> |
43 | ||
44 | #include <linux/skbuff.h> | |
45 | #include <linux/random.h> /* for get_random_bytes */ | |
46 | #include <net/sctp/sctp.h> | |
47 | #include <net/sctp/sm.h> | |
48 | ||
072017b4 | 49 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
50 | __u8 type, __u8 flags, int paylen, |
51 | gfp_t gfp); | |
072017b4 | 52 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 53 | __u8 flags, int paylen, gfp_t gfp); |
072017b4 | 54 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
cea8768f MRL |
55 | __u8 type, __u8 flags, int paylen, |
56 | gfp_t gfp); | |
f48ef4c7 XL |
57 | static struct sctp_cookie_param *sctp_pack_cookie( |
58 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
59 | const struct sctp_association *asoc, |
60 | const struct sctp_chunk *init_chunk, | |
61 | int *cookie_len, | |
62 | const __u8 *raw_addrs, int addrs_len); | |
63 | static int sctp_process_param(struct sctp_association *asoc, | |
64 | union sctp_params param, | |
65 | const union sctp_addr *peer_addr, | |
dd0fc66f | 66 | gfp_t gfp); |
8ee4be37 VY |
67 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, |
68 | const void *data); | |
1da177e4 | 69 | |
072017b4 VY |
70 | /* Control chunk destructor */ |
71 | static void sctp_control_release_owner(struct sk_buff *skb) | |
72 | { | |
1b1e0bc9 XL |
73 | struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg; |
74 | ||
ec2e506c XL |
75 | if (chunk->shkey) { |
76 | struct sctp_shared_key *shkey = chunk->shkey; | |
77 | struct sctp_association *asoc = chunk->asoc; | |
78 | ||
79 | /* refcnt == 2 and !list_empty mean after this release, it's | |
80 | * not being used anywhere, and it's time to notify userland | |
81 | * that this shkey can be freed if it's been deactivated. | |
82 | */ | |
83 | if (shkey->deactivated && !list_empty(&shkey->key_list) && | |
84 | refcount_read(&shkey->refcnt) == 2) { | |
85 | struct sctp_ulpevent *ev; | |
86 | ||
87 | ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id, | |
88 | SCTP_AUTH_FREE_KEY, | |
89 | GFP_KERNEL); | |
90 | if (ev) | |
91 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
92 | } | |
1b1e0bc9 | 93 | sctp_auth_shkey_release(chunk->shkey); |
ec2e506c | 94 | } |
072017b4 VY |
95 | } |
96 | ||
97 | static void sctp_control_set_owner_w(struct sctp_chunk *chunk) | |
98 | { | |
99 | struct sctp_association *asoc = chunk->asoc; | |
100 | struct sk_buff *skb = chunk->skb; | |
101 | ||
102 | /* TODO: properly account for control chunks. | |
103 | * To do it right we'll need: | |
104 | * 1) endpoint if association isn't known. | |
105 | * 2) proper memory accounting. | |
106 | * | |
107 | * For now don't do anything for now. | |
108 | */ | |
1b1e0bc9 XL |
109 | if (chunk->auth) { |
110 | chunk->shkey = asoc->shkey; | |
111 | sctp_auth_shkey_hold(chunk->shkey); | |
112 | } | |
072017b4 | 113 | skb->sk = asoc ? asoc->base.sk : NULL; |
1b1e0bc9 | 114 | skb_shinfo(skb)->destructor_arg = chunk; |
072017b4 VY |
115 | skb->destructor = sctp_control_release_owner; |
116 | } | |
117 | ||
1da177e4 LT |
118 | /* What was the inbound interface for this chunk? */ |
119 | int sctp_chunk_iif(const struct sctp_chunk *chunk) | |
120 | { | |
e7487c86 | 121 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 122 | |
e7487c86 | 123 | return SCTP_INPUT_CB(skb)->af->skb_iif(skb); |
1da177e4 LT |
124 | } |
125 | ||
126 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
127 | * | |
128 | * Note 2: The ECN capable field is reserved for future use of | |
129 | * Explicit Congestion Notification. | |
130 | */ | |
131 | static const struct sctp_paramhdr ecap_param = { | |
132 | SCTP_PARAM_ECN_CAPABLE, | |
09640e63 | 133 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
134 | }; |
135 | static const struct sctp_paramhdr prsctp_param = { | |
136 | SCTP_PARAM_FWD_TSN_SUPPORT, | |
09640e63 | 137 | cpu_to_be16(sizeof(struct sctp_paramhdr)), |
1da177e4 LT |
138 | }; |
139 | ||
8914f4ba MRL |
140 | /* A helper to initialize an op error inside a provided chunk, as most |
141 | * cause codes will be embedded inside an abort chunk. | |
1da177e4 | 142 | */ |
6d3e8aa8 MRL |
143 | int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, |
144 | size_t paylen) | |
1da177e4 | 145 | { |
d8238d9d | 146 | struct sctp_errhdr err; |
1da177e4 LT |
147 | __u16 len; |
148 | ||
d808ad9a | 149 | /* Cause code constants are now defined in network order. */ |
1da177e4 | 150 | err.cause = cause_code; |
d8238d9d | 151 | len = sizeof(err) + paylen; |
6d3e8aa8 MRL |
152 | err.length = htons(len); |
153 | ||
154 | if (skb_tailroom(chunk->skb) < len) | |
155 | return -ENOSPC; | |
156 | ||
d8238d9d | 157 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); |
6d3e8aa8 MRL |
158 | |
159 | return 0; | |
1da177e4 LT |
160 | } |
161 | ||
162 | /* 3.3.2 Initiation (INIT) (1) | |
163 | * | |
164 | * This chunk is used to initiate a SCTP association between two | |
165 | * endpoints. The format of the INIT chunk is shown below: | |
166 | * | |
167 | * 0 1 2 3 | |
168 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
169 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
170 | * | Type = 1 | Chunk Flags | Chunk Length | | |
171 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
172 | * | Initiate Tag | | |
173 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
174 | * | Advertised Receiver Window Credit (a_rwnd) | | |
175 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
176 | * | Number of Outbound Streams | Number of Inbound Streams | | |
177 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
178 | * | Initial TSN | | |
179 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
180 | * \ \ | |
181 | * / Optional/Variable-Length Parameters / | |
182 | * \ \ | |
183 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
184 | * | |
185 | * | |
186 | * The INIT chunk contains the following parameters. Unless otherwise | |
187 | * noted, each parameter MUST only be included once in the INIT chunk. | |
188 | * | |
189 | * Fixed Parameters Status | |
190 | * ---------------------------------------------- | |
191 | * Initiate Tag Mandatory | |
192 | * Advertised Receiver Window Credit Mandatory | |
193 | * Number of Outbound Streams Mandatory | |
194 | * Number of Inbound Streams Mandatory | |
195 | * Initial TSN Mandatory | |
196 | * | |
197 | * Variable Parameters Status Type Value | |
198 | * ------------------------------------------------------------- | |
199 | * IPv4 Address (Note 1) Optional 5 | |
200 | * IPv6 Address (Note 1) Optional 6 | |
201 | * Cookie Preservative Optional 9 | |
202 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) | |
203 | * Host Name Address (Note 3) Optional 11 | |
204 | * Supported Address Types (Note 4) Optional 12 | |
205 | */ | |
206 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, | |
327c0dab XL |
207 | const struct sctp_bind_addr *bp, |
208 | gfp_t gfp, int vparam_len) | |
1da177e4 | 209 | { |
e1fc3b14 | 210 | struct net *net = sock_net(asoc->base.sk); |
327c0dab XL |
211 | struct sctp_supported_ext_param ext_param; |
212 | struct sctp_adaptation_ind_param aiparam; | |
213 | struct sctp_paramhdr *auth_chunks = NULL; | |
214 | struct sctp_paramhdr *auth_hmacs = NULL; | |
215 | struct sctp_supported_addrs_param sat; | |
b14878cc | 216 | struct sctp_endpoint *ep = asoc->ep; |
1da177e4 LT |
217 | struct sctp_chunk *retval = NULL; |
218 | int num_types, addrs_len = 0; | |
327c0dab XL |
219 | struct sctp_inithdr init; |
220 | union sctp_params addrs; | |
1da177e4 | 221 | struct sctp_sock *sp; |
96b120b3 | 222 | __u8 extensions[5]; |
327c0dab | 223 | size_t chunksize; |
3dbe8656 | 224 | __be16 types[2]; |
131a47e3 | 225 | int num_ext = 0; |
1da177e4 LT |
226 | |
227 | /* RFC 2960 3.3.2 Initiation (INIT) (1) | |
228 | * | |
229 | * Note 1: The INIT chunks can contain multiple addresses that | |
230 | * can be IPv4 and/or IPv6 in any combination. | |
231 | */ | |
1da177e4 LT |
232 | |
233 | /* Convert the provided bind address list to raw format. */ | |
234 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); | |
235 | ||
236 | init.init_tag = htonl(asoc->c.my_vtag); | |
237 | init.a_rwnd = htonl(asoc->rwnd); | |
238 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
239 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
240 | init.initial_tsn = htonl(asoc->c.initial_tsn); | |
241 | ||
242 | /* How many address types are needed? */ | |
243 | sp = sctp_sk(asoc->base.sk); | |
244 | num_types = sp->pf->supported_addrs(sp, types); | |
245 | ||
a8170c35 | 246 | chunksize = sizeof(init) + addrs_len; |
e2f036a9 | 247 | chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); |
1da177e4 | 248 | chunksize += sizeof(ecap_param); |
8ee4be37 | 249 | |
28aa4c26 | 250 | if (asoc->prsctp_enable) |
036b579b VY |
251 | chunksize += sizeof(prsctp_param); |
252 | ||
131a47e3 VY |
253 | /* ADDIP: Section 4.2.7: |
254 | * An implementation supporting this extension [ADDIP] MUST list | |
255 | * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and | |
256 | * INIT-ACK parameters. | |
131a47e3 | 257 | */ |
e1fc3b14 | 258 | if (net->sctp.addip_enable) { |
131a47e3 VY |
259 | extensions[num_ext] = SCTP_CID_ASCONF; |
260 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
261 | num_ext += 2; | |
262 | } | |
263 | ||
c28445c3 XL |
264 | if (asoc->reconf_enable) { |
265 | extensions[num_ext] = SCTP_CID_RECONF; | |
266 | num_ext += 1; | |
267 | } | |
268 | ||
6fc791ee | 269 | if (sp->adaptation_ind) |
270 | chunksize += sizeof(aiparam); | |
271 | ||
96b120b3 XL |
272 | if (sp->strm_interleave) { |
273 | extensions[num_ext] = SCTP_CID_I_DATA; | |
274 | num_ext += 1; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | chunksize += vparam_len; |
278 | ||
730fc3d0 | 279 | /* Account for AUTH related parameters */ |
b14878cc | 280 | if (ep->auth_enable) { |
730fc3d0 VY |
281 | /* Add random parameter length*/ |
282 | chunksize += sizeof(asoc->c.auth_random); | |
283 | ||
284 | /* Add HMACS parameter length if any were defined */ | |
3c918704 | 285 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 286 | if (auth_hmacs->length) |
e2f036a9 | 287 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
288 | else |
289 | auth_hmacs = NULL; | |
290 | ||
291 | /* Add CHUNKS parameter length */ | |
3c918704 | 292 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 293 | if (auth_chunks->length) |
e2f036a9 | 294 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 | 295 | else |
9baffaa6 | 296 | auth_chunks = NULL; |
730fc3d0 VY |
297 | |
298 | extensions[num_ext] = SCTP_CID_AUTH; | |
299 | num_ext += 1; | |
300 | } | |
301 | ||
131a47e3 VY |
302 | /* If we have any extensions to report, account for that */ |
303 | if (num_ext) | |
15328d9f | 304 | chunksize += SCTP_PAD4(sizeof(ext_param) + 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; | |
15328d9f XL |
346 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
347 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 348 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 VY |
349 | } |
350 | ||
28aa4c26 | 351 | if (asoc->prsctp_enable) |
1da177e4 | 352 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
131a47e3 | 353 | |
6fc791ee | 354 | if (sp->adaptation_ind) { |
355 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
356 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
357 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
358 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
359 | } | |
131a47e3 | 360 | |
730fc3d0 | 361 | /* Add SCTP-AUTH chunks to the parameter list */ |
b14878cc | 362 | if (ep->auth_enable) { |
730fc3d0 VY |
363 | sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), |
364 | asoc->c.auth_random); | |
365 | if (auth_hmacs) | |
366 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
367 | auth_hmacs); | |
368 | if (auth_chunks) | |
369 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
370 | auth_chunks); | |
371 | } | |
1da177e4 | 372 | nodata: |
a51482bd | 373 | kfree(addrs.v); |
1da177e4 LT |
374 | return retval; |
375 | } | |
376 | ||
377 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, | |
327c0dab XL |
378 | const struct sctp_chunk *chunk, |
379 | gfp_t gfp, int unkparam_len) | |
1da177e4 | 380 | { |
327c0dab XL |
381 | struct sctp_supported_ext_param ext_param; |
382 | struct sctp_adaptation_ind_param aiparam; | |
383 | struct sctp_paramhdr *auth_chunks = NULL; | |
384 | struct sctp_paramhdr *auth_random = NULL; | |
385 | struct sctp_paramhdr *auth_hmacs = NULL; | |
386 | struct sctp_chunk *retval = NULL; | |
387 | struct sctp_cookie_param *cookie; | |
4ae70c08 | 388 | struct sctp_inithdr initack; |
1da177e4 | 389 | union sctp_params addrs; |
6fc791ee | 390 | struct sctp_sock *sp; |
96b120b3 | 391 | __u8 extensions[5]; |
1da177e4 | 392 | size_t chunksize; |
131a47e3 | 393 | int num_ext = 0; |
327c0dab XL |
394 | int cookie_len; |
395 | int addrs_len; | |
1da177e4 LT |
396 | |
397 | /* Note: there may be no addresses to embed. */ | |
398 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); | |
399 | ||
400 | initack.init_tag = htonl(asoc->c.my_vtag); | |
401 | initack.a_rwnd = htonl(asoc->rwnd); | |
402 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); | |
403 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); | |
404 | initack.initial_tsn = htonl(asoc->c.initial_tsn); | |
405 | ||
406 | /* FIXME: We really ought to build the cookie right | |
407 | * into the packet instead of allocating more fresh memory. | |
408 | */ | |
409 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, | |
410 | addrs.v, addrs_len); | |
411 | if (!cookie) | |
412 | goto nomem_cookie; | |
413 | ||
414 | /* Calculate the total size of allocation, include the reserved | |
415 | * space for reporting unknown parameters if it is specified. | |
416 | */ | |
6fc791ee | 417 | sp = sctp_sk(asoc->base.sk); |
1da177e4 LT |
418 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
419 | ||
d808ad9a | 420 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
1da177e4 LT |
421 | if (asoc->peer.ecn_capable) |
422 | chunksize += sizeof(ecap_param); | |
423 | ||
5ffad5ac | 424 | if (asoc->peer.prsctp_capable) |
036b579b VY |
425 | chunksize += sizeof(prsctp_param); |
426 | ||
5ffad5ac | 427 | if (asoc->peer.asconf_capable) { |
131a47e3 VY |
428 | extensions[num_ext] = SCTP_CID_ASCONF; |
429 | extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; | |
430 | num_ext += 2; | |
431 | } | |
432 | ||
c28445c3 XL |
433 | if (asoc->peer.reconf_capable) { |
434 | extensions[num_ext] = SCTP_CID_RECONF; | |
435 | num_ext += 1; | |
436 | } | |
437 | ||
6fc791ee | 438 | if (sp->adaptation_ind) |
439 | chunksize += sizeof(aiparam); | |
1da177e4 | 440 | |
96b120b3 XL |
441 | if (asoc->intl_enable) { |
442 | extensions[num_ext] = SCTP_CID_I_DATA; | |
443 | num_ext += 1; | |
444 | } | |
445 | ||
730fc3d0 | 446 | if (asoc->peer.auth_capable) { |
3c918704 | 447 | auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; |
730fc3d0 VY |
448 | chunksize += ntohs(auth_random->length); |
449 | ||
3c918704 | 450 | auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; |
730fc3d0 | 451 | if (auth_hmacs->length) |
e2f036a9 | 452 | chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); |
730fc3d0 VY |
453 | else |
454 | auth_hmacs = NULL; | |
455 | ||
3c918704 | 456 | auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; |
730fc3d0 | 457 | if (auth_chunks->length) |
e2f036a9 | 458 | chunksize += SCTP_PAD4(ntohs(auth_chunks->length)); |
730fc3d0 VY |
459 | else |
460 | auth_chunks = NULL; | |
461 | ||
462 | extensions[num_ext] = SCTP_CID_AUTH; | |
463 | num_ext += 1; | |
464 | } | |
465 | ||
8ee4be37 | 466 | if (num_ext) |
15328d9f | 467 | chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); |
8ee4be37 | 468 | |
1da177e4 | 469 | /* Now allocate and fill out the chunk. */ |
cea8768f | 470 | retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); |
1da177e4 LT |
471 | if (!retval) |
472 | goto nomem_chunk; | |
473 | ||
b99a4d53 DC |
474 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
475 | * | |
476 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
477 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
478 | * address from which it received the DATA or control chunk | |
479 | * to which it is replying. | |
480 | * | |
481 | * [INIT ACK back to where the INIT came from.] | |
1da177e4 | 482 | */ |
4ff40b86 XL |
483 | if (chunk->transport) |
484 | retval->transport = | |
485 | sctp_assoc_lookup_paddr(asoc, | |
486 | &chunk->transport->ipaddr); | |
b99a4d53 | 487 | |
1da177e4 LT |
488 | retval->subh.init_hdr = |
489 | sctp_addto_chunk(retval, sizeof(initack), &initack); | |
490 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); | |
491 | sctp_addto_chunk(retval, cookie_len, cookie); | |
492 | if (asoc->peer.ecn_capable) | |
493 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); | |
131a47e3 VY |
494 | if (num_ext) { |
495 | ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; | |
15328d9f XL |
496 | ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); |
497 | sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); | |
8ee4be37 | 498 | sctp_addto_param(retval, num_ext, extensions); |
131a47e3 | 499 | } |
1da177e4 LT |
500 | if (asoc->peer.prsctp_capable) |
501 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); | |
502 | ||
6fc791ee | 503 | if (sp->adaptation_ind) { |
504 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; | |
505 | aiparam.param_hdr.length = htons(sizeof(aiparam)); | |
506 | aiparam.adaptation_ind = htonl(sp->adaptation_ind); | |
507 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); | |
508 | } | |
1da177e4 | 509 | |
730fc3d0 VY |
510 | if (asoc->peer.auth_capable) { |
511 | sctp_addto_chunk(retval, ntohs(auth_random->length), | |
512 | auth_random); | |
513 | if (auth_hmacs) | |
514 | sctp_addto_chunk(retval, ntohs(auth_hmacs->length), | |
515 | auth_hmacs); | |
516 | if (auth_chunks) | |
517 | sctp_addto_chunk(retval, ntohs(auth_chunks->length), | |
518 | auth_chunks); | |
519 | } | |
520 | ||
1da177e4 LT |
521 | /* We need to remove the const qualifier at this point. */ |
522 | retval->asoc = (struct sctp_association *) asoc; | |
523 | ||
1da177e4 LT |
524 | nomem_chunk: |
525 | kfree(cookie); | |
526 | nomem_cookie: | |
a51482bd | 527 | kfree(addrs.v); |
1da177e4 LT |
528 | return retval; |
529 | } | |
530 | ||
531 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): | |
532 | * | |
533 | * This chunk is used only during the initialization of an association. | |
534 | * It is sent by the initiator of an association to its peer to complete | |
535 | * the initialization process. This chunk MUST precede any DATA chunk | |
536 | * sent within the association, but MAY be bundled with one or more DATA | |
537 | * chunks in the same packet. | |
538 | * | |
539 | * 0 1 2 3 | |
540 | * 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 | |
541 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
542 | * | Type = 10 |Chunk Flags | Length | | |
543 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
544 | * / Cookie / | |
545 | * \ \ | |
546 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
547 | * | |
548 | * Chunk Flags: 8 bit | |
549 | * | |
550 | * Set to zero on transmit and ignored on receipt. | |
551 | * | |
552 | * Length: 16 bits (unsigned integer) | |
553 | * | |
554 | * Set to the size of the chunk in bytes, including the 4 bytes of | |
555 | * the chunk header and the size of the Cookie. | |
556 | * | |
557 | * Cookie: variable size | |
558 | * | |
559 | * This field must contain the exact cookie received in the | |
560 | * State Cookie parameter from the previous INIT ACK. | |
561 | * | |
562 | * An implementation SHOULD make the cookie as small as possible | |
563 | * to insure interoperability. | |
564 | */ | |
565 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, | |
327c0dab | 566 | const struct sctp_chunk *chunk) |
1da177e4 LT |
567 | { |
568 | struct sctp_chunk *retval; | |
1da177e4 | 569 | int cookie_len; |
327c0dab | 570 | void *cookie; |
1da177e4 LT |
571 | |
572 | cookie = asoc->peer.cookie; | |
573 | cookie_len = asoc->peer.cookie_len; | |
574 | ||
575 | /* Build a cookie echo chunk. */ | |
cea8768f MRL |
576 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, |
577 | cookie_len, GFP_ATOMIC); | |
1da177e4 LT |
578 | if (!retval) |
579 | goto nodata; | |
580 | retval->subh.cookie_hdr = | |
581 | sctp_addto_chunk(retval, cookie_len, cookie); | |
582 | ||
583 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
584 | * | |
585 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
586 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
587 | * address from which it * received the DATA or control chunk | |
588 | * to which it is replying. | |
589 | * | |
590 | * [COOKIE ECHO back to where the INIT ACK came from.] | |
591 | */ | |
592 | if (chunk) | |
593 | retval->transport = chunk->transport; | |
594 | ||
595 | nodata: | |
596 | return retval; | |
597 | } | |
598 | ||
599 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): | |
600 | * | |
601 | * This chunk is used only during the initialization of an | |
602 | * association. It is used to acknowledge the receipt of a COOKIE | |
603 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent | |
604 | * within the association, but MAY be bundled with one or more DATA | |
605 | * chunks or SACK chunk in the same SCTP packet. | |
606 | * | |
607 | * 0 1 2 3 | |
608 | * 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 | |
609 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
610 | * | Type = 11 |Chunk Flags | Length = 4 | | |
611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
612 | * | |
613 | * Chunk Flags: 8 bits | |
614 | * | |
615 | * Set to zero on transmit and ignored on receipt. | |
616 | */ | |
617 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, | |
327c0dab | 618 | const struct sctp_chunk *chunk) |
1da177e4 LT |
619 | { |
620 | struct sctp_chunk *retval; | |
621 | ||
cea8768f | 622 | retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); |
1da177e4 LT |
623 | |
624 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
625 | * | |
626 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
627 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
628 | * address from which it * received the DATA or control chunk | |
629 | * to which it is replying. | |
630 | * | |
631 | * [COOKIE ACK back to where the COOKIE ECHO came from.] | |
632 | */ | |
4ff40b86 XL |
633 | if (retval && chunk && chunk->transport) |
634 | retval->transport = | |
635 | sctp_assoc_lookup_paddr(asoc, | |
636 | &chunk->transport->ipaddr); | |
1da177e4 LT |
637 | |
638 | return retval; | |
639 | } | |
640 | ||
641 | /* | |
642 | * Appendix A: Explicit Congestion Notification: | |
643 | * CWR: | |
644 | * | |
645 | * RFC 2481 details a specific bit for a sender to send in the header of | |
646 | * its next outbound TCP segment to indicate to its peer that it has | |
647 | * reduced its congestion window. This is termed the CWR bit. For | |
648 | * SCTP the same indication is made by including the CWR chunk. | |
649 | * This chunk contains one data element, i.e. the TSN number that | |
650 | * was sent in the ECNE chunk. This element represents the lowest | |
651 | * TSN number in the datagram that was originally marked with the | |
652 | * CE bit. | |
653 | * | |
654 | * 0 1 2 3 | |
655 | * 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 | |
656 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
657 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | | |
658 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
659 | * | Lowest TSN Number | | |
660 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
661 | * | |
662 | * Note: The CWR is considered a Control chunk. | |
663 | */ | |
664 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, | |
327c0dab XL |
665 | const __u32 lowest_tsn, |
666 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
667 | { |
668 | struct sctp_chunk *retval; | |
65f77105 | 669 | struct sctp_cwrhdr cwr; |
1da177e4 LT |
670 | |
671 | cwr.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 672 | retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, |
65f77105 | 673 | sizeof(cwr), GFP_ATOMIC); |
1da177e4 LT |
674 | |
675 | if (!retval) | |
676 | goto nodata; | |
677 | ||
678 | retval->subh.ecn_cwr_hdr = | |
679 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); | |
680 | ||
681 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
682 | * | |
683 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
684 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
685 | * address from which it * received the DATA or control chunk | |
686 | * to which it is replying. | |
687 | * | |
688 | * [Report a reduced congestion window back to where the ECNE | |
689 | * came from.] | |
690 | */ | |
691 | if (chunk) | |
692 | retval->transport = chunk->transport; | |
693 | ||
694 | nodata: | |
695 | return retval; | |
696 | } | |
697 | ||
698 | /* Make an ECNE chunk. This is a congestion experienced report. */ | |
699 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, | |
327c0dab | 700 | const __u32 lowest_tsn) |
1da177e4 LT |
701 | { |
702 | struct sctp_chunk *retval; | |
1fb6d83b | 703 | struct sctp_ecnehdr ecne; |
1da177e4 LT |
704 | |
705 | ecne.lowest_tsn = htonl(lowest_tsn); | |
072017b4 | 706 | retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, |
1fb6d83b | 707 | sizeof(ecne), GFP_ATOMIC); |
1da177e4 LT |
708 | if (!retval) |
709 | goto nodata; | |
710 | retval->subh.ecne_hdr = | |
711 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); | |
712 | ||
713 | nodata: | |
714 | return retval; | |
715 | } | |
716 | ||
717 | /* Make a DATA chunk for the given association from the provided | |
718 | * parameters. However, do not populate the data payload. | |
719 | */ | |
0c3f6f65 | 720 | struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc, |
327c0dab | 721 | const struct sctp_sndrcvinfo *sinfo, |
0c3f6f65 | 722 | int len, __u8 flags, gfp_t gfp) |
1da177e4 LT |
723 | { |
724 | struct sctp_chunk *retval; | |
725 | struct sctp_datahdr dp; | |
1da177e4 LT |
726 | |
727 | /* We assign the TSN as LATE as possible, not here when | |
728 | * creating the chunk. | |
729 | */ | |
0c3f6f65 XL |
730 | memset(&dp, 0, sizeof(dp)); |
731 | dp.ppid = sinfo->sinfo_ppid; | |
1da177e4 | 732 | dp.stream = htons(sinfo->sinfo_stream); |
1da177e4 LT |
733 | |
734 | /* Set the flags for an unordered send. */ | |
0c3f6f65 | 735 | if (sinfo->sinfo_flags & SCTP_UNORDERED) |
1da177e4 | 736 | flags |= SCTP_DATA_UNORDERED; |
1da177e4 | 737 | |
0c3f6f65 | 738 | retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp); |
1da177e4 | 739 | if (!retval) |
0c3f6f65 | 740 | return NULL; |
1da177e4 LT |
741 | |
742 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
743 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
744 | ||
1da177e4 LT |
745 | return retval; |
746 | } | |
747 | ||
748 | /* Create a selective ackowledgement (SACK) for the given | |
749 | * association. This reports on which TSN's we've seen to date, | |
750 | * including duplicates and gaps. | |
751 | */ | |
47b3ba51 | 752 | struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc) |
1da177e4 | 753 | { |
1da177e4 | 754 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
02015180 | 755 | struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; |
327c0dab | 756 | __u16 num_gabs, num_dup_tsns; |
4244854d | 757 | struct sctp_transport *trans; |
327c0dab XL |
758 | struct sctp_chunk *retval; |
759 | struct sctp_sackhdr sack; | |
760 | __u32 ctsn; | |
761 | int len; | |
1da177e4 | 762 | |
02015180 | 763 | memset(gabs, 0, sizeof(gabs)); |
1da177e4 | 764 | ctsn = sctp_tsnmap_get_ctsn(map); |
bb33381d DB |
765 | |
766 | pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); | |
1da177e4 LT |
767 | |
768 | /* How much room is needed in the chunk? */ | |
02015180 | 769 | num_gabs = sctp_tsnmap_num_gabs(map, gabs); |
1da177e4 LT |
770 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
771 | ||
772 | /* Initialize the SACK header. */ | |
773 | sack.cum_tsn_ack = htonl(ctsn); | |
774 | sack.a_rwnd = htonl(asoc->a_rwnd); | |
775 | sack.num_gap_ack_blocks = htons(num_gabs); | |
776 | sack.num_dup_tsns = htons(num_dup_tsns); | |
777 | ||
778 | len = sizeof(sack) | |
779 | + sizeof(struct sctp_gap_ack_block) * num_gabs | |
780 | + sizeof(__u32) * num_dup_tsns; | |
781 | ||
782 | /* Create the chunk. */ | |
cea8768f | 783 | retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); |
1da177e4 LT |
784 | if (!retval) |
785 | goto nodata; | |
786 | ||
787 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
788 | * | |
789 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
790 | * HEARTBEAT ACK, etc.) to the same destination transport | |
791 | * address from which it received the DATA or control chunk to | |
792 | * which it is replying. This rule should also be followed if | |
793 | * the endpoint is bundling DATA chunks together with the | |
794 | * reply chunk. | |
795 | * | |
796 | * However, when acknowledging multiple DATA chunks received | |
797 | * in packets from different source addresses in a single | |
798 | * SACK, the SACK chunk may be transmitted to one of the | |
799 | * destination transport addresses from which the DATA or | |
800 | * control chunks being acknowledged were received. | |
801 | * | |
802 | * [BUG: We do not implement the following paragraph. | |
803 | * Perhaps we should remember the last transport we used for a | |
804 | * SACK and avoid that (if possible) if we have seen any | |
805 | * duplicates. --piggy] | |
806 | * | |
807 | * When a receiver of a duplicate DATA chunk sends a SACK to a | |
808 | * multi- homed endpoint it MAY be beneficial to vary the | |
809 | * destination address and not use the source address of the | |
810 | * DATA chunk. The reason being that receiving a duplicate | |
811 | * from a multi-homed endpoint might indicate that the return | |
812 | * path (as specified in the source address of the DATA chunk) | |
813 | * for the SACK is broken. | |
814 | * | |
815 | * [Send to the address from which we last received a DATA chunk.] | |
816 | */ | |
817 | retval->transport = asoc->peer.last_data_from; | |
818 | ||
819 | retval->subh.sack_hdr = | |
820 | sctp_addto_chunk(retval, sizeof(sack), &sack); | |
821 | ||
822 | /* Add the gap ack block information. */ | |
823 | if (num_gabs) | |
824 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, | |
02015180 | 825 | gabs); |
1da177e4 LT |
826 | |
827 | /* Add the duplicate TSN information. */ | |
196d6759 | 828 | if (num_dup_tsns) { |
47b3ba51 | 829 | asoc->stats.idupchunks += num_dup_tsns; |
1da177e4 LT |
830 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
831 | sctp_tsnmap_get_dups(map)); | |
196d6759 | 832 | } |
4244854d NH |
833 | /* Once we have a sack generated, check to see what our sack |
834 | * generation is, if its 0, reset the transports to 0, and reset | |
835 | * the association generation to 1 | |
836 | * | |
837 | * The idea is that zero is never used as a valid generation for the | |
838 | * association so no transport will match after a wrap event like this, | |
839 | * Until the next sack | |
840 | */ | |
47b3ba51 | 841 | if (++asoc->peer.sack_generation == 0) { |
4244854d NH |
842 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
843 | transports) | |
844 | trans->sack_generation = 0; | |
47b3ba51 | 845 | asoc->peer.sack_generation = 1; |
4244854d | 846 | } |
1da177e4 LT |
847 | nodata: |
848 | return retval; | |
849 | } | |
850 | ||
851 | /* Make a SHUTDOWN chunk. */ | |
852 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, | |
853 | const struct sctp_chunk *chunk) | |
854 | { | |
e61e4055 | 855 | struct sctp_shutdownhdr shut; |
1da177e4 | 856 | struct sctp_chunk *retval; |
1da177e4 LT |
857 | __u32 ctsn; |
858 | ||
859 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
860 | shut.cum_tsn_ack = htonl(ctsn); | |
861 | ||
072017b4 | 862 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, |
e61e4055 | 863 | sizeof(shut), GFP_ATOMIC); |
1da177e4 LT |
864 | if (!retval) |
865 | goto nodata; | |
866 | ||
867 | retval->subh.shutdown_hdr = | |
868 | sctp_addto_chunk(retval, sizeof(shut), &shut); | |
869 | ||
870 | if (chunk) | |
871 | retval->transport = chunk->transport; | |
872 | nodata: | |
873 | return retval; | |
874 | } | |
875 | ||
876 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, | |
327c0dab | 877 | const struct sctp_chunk *chunk) |
1da177e4 LT |
878 | { |
879 | struct sctp_chunk *retval; | |
880 | ||
cea8768f MRL |
881 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, |
882 | GFP_ATOMIC); | |
1da177e4 LT |
883 | |
884 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
885 | * | |
886 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
887 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
888 | * address from which it * received the DATA or control chunk | |
889 | * to which it is replying. | |
890 | * | |
891 | * [ACK back to where the SHUTDOWN came from.] | |
892 | */ | |
893 | if (retval && chunk) | |
894 | retval->transport = chunk->transport; | |
895 | ||
896 | return retval; | |
897 | } | |
898 | ||
899 | struct sctp_chunk *sctp_make_shutdown_complete( | |
327c0dab XL |
900 | const struct sctp_association *asoc, |
901 | const struct sctp_chunk *chunk) | |
1da177e4 LT |
902 | { |
903 | struct sctp_chunk *retval; | |
904 | __u8 flags = 0; | |
905 | ||
047a2428 JF |
906 | /* Set the T-bit if we have no association (vtag will be |
907 | * reflected) | |
908 | */ | |
1da177e4 LT |
909 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
910 | ||
cea8768f MRL |
911 | retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, |
912 | 0, GFP_ATOMIC); | |
1da177e4 LT |
913 | |
914 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
915 | * | |
916 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
917 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
918 | * address from which it * received the DATA or control chunk | |
919 | * to which it is replying. | |
920 | * | |
921 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK | |
922 | * came from.] | |
923 | */ | |
924 | if (retval && chunk) | |
925 | retval->transport = chunk->transport; | |
926 | ||
d808ad9a | 927 | return retval; |
1da177e4 LT |
928 | } |
929 | ||
930 | /* Create an ABORT. Note that we set the T bit if we have no | |
047a2428 | 931 | * association, except when responding to an INIT (sctpimpguide 2.41). |
1da177e4 LT |
932 | */ |
933 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, | |
327c0dab XL |
934 | const struct sctp_chunk *chunk, |
935 | const size_t hint) | |
1da177e4 LT |
936 | { |
937 | struct sctp_chunk *retval; | |
938 | __u8 flags = 0; | |
939 | ||
047a2428 JF |
940 | /* Set the T-bit if we have no association and 'chunk' is not |
941 | * an INIT (vtag will be reflected). | |
942 | */ | |
943 | if (!asoc) { | |
944 | if (chunk && chunk->chunk_hdr && | |
945 | chunk->chunk_hdr->type == SCTP_CID_INIT) | |
946 | flags = 0; | |
947 | else | |
948 | flags = SCTP_CHUNK_FLAG_T; | |
949 | } | |
1da177e4 | 950 | |
cea8768f MRL |
951 | retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, |
952 | GFP_ATOMIC); | |
1da177e4 LT |
953 | |
954 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
955 | * | |
956 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
957 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
958 | * address from which it * received the DATA or control chunk | |
959 | * to which it is replying. | |
960 | * | |
961 | * [ABORT back to where the offender came from.] | |
962 | */ | |
963 | if (retval && chunk) | |
964 | retval->transport = chunk->transport; | |
965 | ||
966 | return retval; | |
967 | } | |
968 | ||
969 | /* Helper to create ABORT with a NO_USER_DATA error. */ | |
970 | struct sctp_chunk *sctp_make_abort_no_data( | |
327c0dab XL |
971 | const struct sctp_association *asoc, |
972 | const struct sctp_chunk *chunk, | |
973 | __u32 tsn) | |
1da177e4 LT |
974 | { |
975 | struct sctp_chunk *retval; | |
9f81bcd9 | 976 | __be32 payload; |
1da177e4 | 977 | |
d8238d9d XL |
978 | retval = sctp_make_abort(asoc, chunk, |
979 | sizeof(struct sctp_errhdr) + sizeof(tsn)); | |
1da177e4 LT |
980 | |
981 | if (!retval) | |
982 | goto no_mem; | |
983 | ||
984 | /* Put the tsn back into network byte order. */ | |
985 | payload = htonl(tsn); | |
00f1c2df WY |
986 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); |
987 | sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); | |
1da177e4 LT |
988 | |
989 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
990 | * | |
991 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
992 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
993 | * address from which it * received the DATA or control chunk | |
994 | * to which it is replying. | |
995 | * | |
996 | * [ABORT back to where the offender came from.] | |
997 | */ | |
998 | if (chunk) | |
999 | retval->transport = chunk->transport; | |
1000 | ||
1001 | no_mem: | |
1002 | return retval; | |
1003 | } | |
1004 | ||
1005 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ | |
1006 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, | |
6ce8e9ce | 1007 | struct msghdr *msg, |
c164a9ba | 1008 | size_t paylen) |
1da177e4 LT |
1009 | { |
1010 | struct sctp_chunk *retval; | |
c164a9ba SS |
1011 | void *payload = NULL; |
1012 | int err; | |
1da177e4 | 1013 | |
d8238d9d XL |
1014 | retval = sctp_make_abort(asoc, NULL, |
1015 | sizeof(struct sctp_errhdr) + paylen); | |
1da177e4 LT |
1016 | if (!retval) |
1017 | goto err_chunk; | |
1018 | ||
1019 | if (paylen) { | |
1020 | /* Put the msg_iov together into payload. */ | |
c164a9ba | 1021 | payload = kmalloc(paylen, GFP_KERNEL); |
1da177e4 LT |
1022 | if (!payload) |
1023 | goto err_payload; | |
c164a9ba | 1024 | |
6ce8e9ce | 1025 | err = memcpy_from_msg(payload, msg, paylen); |
c164a9ba SS |
1026 | if (err < 0) |
1027 | goto err_copy; | |
1da177e4 LT |
1028 | } |
1029 | ||
00f1c2df WY |
1030 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); |
1031 | sctp_addto_chunk(retval, paylen, payload); | |
1da177e4 LT |
1032 | |
1033 | if (paylen) | |
1034 | kfree(payload); | |
1035 | ||
1036 | return retval; | |
1037 | ||
1038 | err_copy: | |
1039 | kfree(payload); | |
1040 | err_payload: | |
1041 | sctp_chunk_free(retval); | |
1042 | retval = NULL; | |
1043 | err_chunk: | |
1044 | return retval; | |
1045 | } | |
1046 | ||
5c94bf86 AB |
1047 | /* Append bytes to the end of a parameter. Will panic if chunk is not big |
1048 | * enough. | |
1049 | */ | |
1050 | static void *sctp_addto_param(struct sctp_chunk *chunk, int len, | |
1051 | const void *data) | |
1052 | { | |
5c94bf86 | 1053 | int chunklen = ntohs(chunk->chunk_hdr->length); |
327c0dab | 1054 | void *target; |
5c94bf86 AB |
1055 | |
1056 | target = skb_put(chunk->skb, len); | |
1057 | ||
6383cfb3 VY |
1058 | if (data) |
1059 | memcpy(target, data, len); | |
1060 | else | |
1061 | memset(target, 0, len); | |
5c94bf86 AB |
1062 | |
1063 | /* Adjust the chunk length field. */ | |
1064 | chunk->chunk_hdr->length = htons(chunklen + len); | |
1065 | chunk->chunk_end = skb_tail_pointer(chunk->skb); | |
1066 | ||
1067 | return target; | |
1068 | } | |
1069 | ||
d808ad9a | 1070 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
1da177e4 | 1071 | struct sctp_chunk *sctp_make_abort_violation( |
327c0dab XL |
1072 | const struct sctp_association *asoc, |
1073 | const struct sctp_chunk *chunk, | |
1074 | const __u8 *payload, | |
1075 | const size_t paylen) | |
1da177e4 LT |
1076 | { |
1077 | struct sctp_chunk *retval; | |
1078 | struct sctp_paramhdr phdr; | |
1079 | ||
d8238d9d XL |
1080 | retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + |
1081 | paylen + sizeof(phdr)); | |
1da177e4 LT |
1082 | if (!retval) |
1083 | goto end; | |
1084 | ||
3c918704 XL |
1085 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + |
1086 | sizeof(phdr)); | |
1da177e4 LT |
1087 | |
1088 | phdr.type = htons(chunk->chunk_hdr->type); | |
1089 | phdr.length = chunk->chunk_hdr->length; | |
00f1c2df | 1090 | sctp_addto_chunk(retval, paylen, payload); |
3c918704 | 1091 | sctp_addto_param(retval, sizeof(phdr), &phdr); |
1da177e4 LT |
1092 | |
1093 | end: | |
1094 | return retval; | |
1095 | } | |
1096 | ||
ba016670 | 1097 | struct sctp_chunk *sctp_make_violation_paramlen( |
327c0dab XL |
1098 | const struct sctp_association *asoc, |
1099 | const struct sctp_chunk *chunk, | |
1100 | struct sctp_paramhdr *param) | |
ba016670 | 1101 | { |
ba016670 | 1102 | static const char error[] = "The following parameter had invalid length:"; |
d8238d9d | 1103 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + |
3c918704 | 1104 | sizeof(*param); |
327c0dab | 1105 | struct sctp_chunk *retval; |
ba016670 WY |
1106 | |
1107 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1108 | if (!retval) | |
1109 | goto nodata; | |
1110 | ||
1111 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, | |
3c918704 | 1112 | sizeof(error) + sizeof(*param)); |
ba016670 | 1113 | sctp_addto_chunk(retval, sizeof(error), error); |
3c918704 | 1114 | sctp_addto_param(retval, sizeof(*param), param); |
ba016670 WY |
1115 | |
1116 | nodata: | |
1117 | return retval; | |
1118 | } | |
1119 | ||
de4594a5 | 1120 | struct sctp_chunk *sctp_make_violation_max_retrans( |
327c0dab XL |
1121 | const struct sctp_association *asoc, |
1122 | const struct sctp_chunk *chunk) | |
de4594a5 | 1123 | { |
39a2d5cb | 1124 | static const char error[] = "Association exceeded its max_retrans count"; |
d8238d9d | 1125 | size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); |
327c0dab | 1126 | struct sctp_chunk *retval; |
de4594a5 NH |
1127 | |
1128 | retval = sctp_make_abort(asoc, chunk, payload_len); | |
1129 | if (!retval) | |
1130 | goto nodata; | |
1131 | ||
1132 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); | |
1133 | sctp_addto_chunk(retval, sizeof(error), error); | |
1134 | ||
1135 | nodata: | |
1136 | return retval; | |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | /* Make a HEARTBEAT chunk. */ |
1140 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, | |
edf903f8 | 1141 | const struct sctp_transport *transport) |
1da177e4 | 1142 | { |
edf903f8 | 1143 | struct sctp_sender_hb_info hbinfo; |
92c73af5 | 1144 | struct sctp_chunk *retval; |
92c73af5 | 1145 | |
cea8768f MRL |
1146 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, |
1147 | sizeof(hbinfo), GFP_ATOMIC); | |
1da177e4 LT |
1148 | |
1149 | if (!retval) | |
1150 | goto nodata; | |
1151 | ||
92c73af5 | 1152 | hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; |
edf903f8 | 1153 | hbinfo.param_hdr.length = htons(sizeof(hbinfo)); |
92c73af5 WY |
1154 | hbinfo.daddr = transport->ipaddr; |
1155 | hbinfo.sent_at = jiffies; | |
1156 | hbinfo.hb_nonce = transport->hb_nonce; | |
1157 | ||
1da177e4 LT |
1158 | /* Cast away the 'const', as this is just telling the chunk |
1159 | * what transport it belongs to. | |
1160 | */ | |
1161 | retval->transport = (struct sctp_transport *) transport; | |
92c73af5 WY |
1162 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), |
1163 | &hbinfo); | |
1da177e4 LT |
1164 | |
1165 | nodata: | |
1166 | return retval; | |
1167 | } | |
1168 | ||
1169 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, | |
327c0dab XL |
1170 | const struct sctp_chunk *chunk, |
1171 | const void *payload, | |
1172 | const size_t paylen) | |
1da177e4 LT |
1173 | { |
1174 | struct sctp_chunk *retval; | |
1175 | ||
cea8768f MRL |
1176 | retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, |
1177 | GFP_ATOMIC); | |
1da177e4 LT |
1178 | if (!retval) |
1179 | goto nodata; | |
1180 | ||
1181 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); | |
1182 | ||
1183 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1184 | * | |
1185 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1186 | * HEARTBEAT ACK, * etc.) to the same destination transport | |
1187 | * address from which it * received the DATA or control chunk | |
1188 | * to which it is replying. | |
1189 | * | |
1190 | * [HBACK back to where the HEARTBEAT came from.] | |
1191 | */ | |
1192 | if (chunk) | |
1193 | retval->transport = chunk->transport; | |
1194 | ||
1195 | nodata: | |
1196 | return retval; | |
1197 | } | |
1198 | ||
1199 | /* Create an Operation Error chunk with the specified space reserved. | |
1200 | * This routine can be used for containing multiple causes in the chunk. | |
1201 | */ | |
1202 | static struct sctp_chunk *sctp_make_op_error_space( | |
327c0dab XL |
1203 | const struct sctp_association *asoc, |
1204 | const struct sctp_chunk *chunk, | |
1205 | size_t size) | |
1da177e4 LT |
1206 | { |
1207 | struct sctp_chunk *retval; | |
1208 | ||
072017b4 | 1209 | retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, |
d8238d9d XL |
1210 | sizeof(struct sctp_errhdr) + size, |
1211 | GFP_ATOMIC); | |
1da177e4 LT |
1212 | if (!retval) |
1213 | goto nodata; | |
1214 | ||
1215 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints | |
1216 | * | |
1217 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, | |
1218 | * HEARTBEAT ACK, etc.) to the same destination transport | |
1219 | * address from which it received the DATA or control chunk | |
1220 | * to which it is replying. | |
1221 | * | |
1222 | */ | |
1223 | if (chunk) | |
1224 | retval->transport = chunk->transport; | |
1225 | ||
1226 | nodata: | |
1227 | return retval; | |
1228 | } | |
1229 | ||
8914f4ba MRL |
1230 | /* Create an Operation Error chunk of a fixed size, specifically, |
1231 | * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads. | |
1232 | * This is a helper function to allocate an error chunk for for those | |
1233 | * invalid parameter codes in which we may not want to report all the | |
1234 | * errors, if the incoming chunk is large. If it can't fit in a single | |
1235 | * packet, we ignore it. | |
5fa782c2 | 1236 | */ |
8914f4ba | 1237 | static inline struct sctp_chunk *sctp_make_op_error_limited( |
327c0dab XL |
1238 | const struct sctp_association *asoc, |
1239 | const struct sctp_chunk *chunk) | |
5fa782c2 | 1240 | { |
8914f4ba MRL |
1241 | size_t size = SCTP_DEFAULT_MAXSEGMENT; |
1242 | struct sctp_sock *sp = NULL; | |
1243 | ||
1244 | if (asoc) { | |
1245 | size = min_t(size_t, size, asoc->pathmtu); | |
1246 | sp = sctp_sk(asoc->base.sk); | |
1247 | } | |
5fa782c2 | 1248 | |
8914f4ba | 1249 | size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr)); |
5fa782c2 NH |
1250 | |
1251 | return sctp_make_op_error_space(asoc, chunk, size); | |
1252 | } | |
1253 | ||
1da177e4 LT |
1254 | /* Create an Operation Error chunk. */ |
1255 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, | |
327c0dab XL |
1256 | const struct sctp_chunk *chunk, |
1257 | __be16 cause_code, const void *payload, | |
1258 | size_t paylen, size_t reserve_tail) | |
1da177e4 LT |
1259 | { |
1260 | struct sctp_chunk *retval; | |
1261 | ||
6383cfb3 | 1262 | retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); |
1da177e4 LT |
1263 | if (!retval) |
1264 | goto nodata; | |
1265 | ||
6383cfb3 | 1266 | sctp_init_cause(retval, cause_code, paylen + reserve_tail); |
00f1c2df | 1267 | sctp_addto_chunk(retval, paylen, payload); |
6383cfb3 VY |
1268 | if (reserve_tail) |
1269 | sctp_addto_param(retval, reserve_tail, NULL); | |
1da177e4 LT |
1270 | |
1271 | nodata: | |
1272 | return retval; | |
1273 | } | |
1274 | ||
1b1e0bc9 XL |
1275 | struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc, |
1276 | __u16 key_id) | |
4cd57c80 | 1277 | { |
4cd57c80 | 1278 | struct sctp_authhdr auth_hdr; |
327c0dab XL |
1279 | struct sctp_hmac *hmac_desc; |
1280 | struct sctp_chunk *retval; | |
4cd57c80 VY |
1281 | |
1282 | /* Get the first hmac that the peer told us to use */ | |
1283 | hmac_desc = sctp_auth_asoc_get_hmac(asoc); | |
1284 | if (unlikely(!hmac_desc)) | |
1285 | return NULL; | |
1286 | ||
072017b4 | 1287 | retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, |
96f7ef4d XL |
1288 | hmac_desc->hmac_len + sizeof(auth_hdr), |
1289 | GFP_ATOMIC); | |
4cd57c80 VY |
1290 | if (!retval) |
1291 | return NULL; | |
1292 | ||
1293 | auth_hdr.hmac_id = htons(hmac_desc->hmac_id); | |
1b1e0bc9 | 1294 | auth_hdr.shkey_id = htons(key_id); |
4cd57c80 | 1295 | |
96f7ef4d XL |
1296 | retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), |
1297 | &auth_hdr); | |
4cd57c80 | 1298 | |
594831a8 | 1299 | skb_put_zero(retval->skb, hmac_desc->hmac_len); |
4cd57c80 VY |
1300 | |
1301 | /* Adjust the chunk header to include the empty MAC */ | |
1302 | retval->chunk_hdr->length = | |
1303 | htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); | |
1304 | retval->chunk_end = skb_tail_pointer(retval->skb); | |
1305 | ||
1306 | return retval; | |
1307 | } | |
1308 | ||
1309 | ||
1da177e4 LT |
1310 | /******************************************************************** |
1311 | * 2nd Level Abstractions | |
1312 | ********************************************************************/ | |
1313 | ||
1314 | /* Turn an skb into a chunk. | |
1315 | * FIXME: Eventually move the structure directly inside the skb->cb[]. | |
3dc0a548 | 1316 | * |
1317 | * sctpimpguide-05.txt Section 2.8.2 | |
1318 | * M1) Each time a new DATA chunk is transmitted | |
1319 | * set the 'TSN.Missing.Report' count for that TSN to 0. The | |
1320 | * 'TSN.Missing.Report' count will be used to determine missing chunks | |
1321 | * and when to fast retransmit. | |
1322 | * | |
1da177e4 LT |
1323 | */ |
1324 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, | |
327c0dab XL |
1325 | const struct sctp_association *asoc, |
1326 | struct sock *sk, gfp_t gfp) | |
1da177e4 LT |
1327 | { |
1328 | struct sctp_chunk *retval; | |
1329 | ||
cea8768f | 1330 | retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); |
1da177e4 LT |
1331 | |
1332 | if (!retval) | |
1333 | goto nodata; | |
bb33381d DB |
1334 | if (!sk) |
1335 | pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); | |
1da177e4 | 1336 | |
79af02c2 | 1337 | INIT_LIST_HEAD(&retval->list); |
1da177e4 LT |
1338 | retval->skb = skb; |
1339 | retval->asoc = (struct sctp_association *)asoc; | |
1da177e4 | 1340 | retval->singleton = 1; |
1da177e4 | 1341 | |
3dc0a548 | 1342 | retval->fast_retransmit = SCTP_CAN_FRTX; |
1da177e4 LT |
1343 | |
1344 | /* Polish the bead hole. */ | |
1345 | INIT_LIST_HEAD(&retval->transmitted_list); | |
1346 | INIT_LIST_HEAD(&retval->frag_list); | |
1347 | SCTP_DBG_OBJCNT_INC(chunk); | |
e7f02796 | 1348 | refcount_set(&retval->refcnt, 1); |
1da177e4 LT |
1349 | |
1350 | nodata: | |
1351 | return retval; | |
1352 | } | |
1353 | ||
1354 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ | |
1355 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, | |
1356 | union sctp_addr *dest) | |
1357 | { | |
f235fca3 | 1358 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
16b0a030 | 1359 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1da177e4 LT |
1360 | } |
1361 | ||
1362 | /* Extract the source address from a chunk. */ | |
1363 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) | |
1364 | { | |
1365 | /* If we have a known transport, use that. */ | |
1366 | if (chunk->transport) { | |
6a1e5f33 | 1367 | return &chunk->transport->ipaddr; |
1da177e4 LT |
1368 | } else { |
1369 | /* Otherwise, extract it from the IP header. */ | |
6a1e5f33 | 1370 | return &chunk->source; |
1da177e4 LT |
1371 | } |
1372 | } | |
1373 | ||
1374 | /* Create a new chunk, setting the type and flags headers from the | |
1375 | * arguments, reserving enough space for a 'paylen' byte payload. | |
1376 | */ | |
072017b4 | 1377 | static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, |
327c0dab XL |
1378 | __u8 type, __u8 flags, int paylen, |
1379 | gfp_t gfp) | |
1da177e4 | 1380 | { |
922dbc5b | 1381 | struct sctp_chunkhdr *chunk_hdr; |
327c0dab | 1382 | struct sctp_chunk *retval; |
1da177e4 LT |
1383 | struct sk_buff *skb; |
1384 | struct sock *sk; | |
07f2c7ab AK |
1385 | int chunklen; |
1386 | ||
1387 | chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen); | |
1388 | if (chunklen > SCTP_MAX_CHUNK_LEN) | |
1389 | goto nodata; | |
1da177e4 LT |
1390 | |
1391 | /* No need to allocate LL here, as this is only a chunk. */ | |
07f2c7ab | 1392 | skb = alloc_skb(chunklen, gfp); |
1da177e4 LT |
1393 | if (!skb) |
1394 | goto nodata; | |
1395 | ||
1396 | /* Make room for the chunk header. */ | |
922dbc5b | 1397 | chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); |
1da177e4 LT |
1398 | chunk_hdr->type = type; |
1399 | chunk_hdr->flags = flags; | |
922dbc5b | 1400 | chunk_hdr->length = htons(sizeof(*chunk_hdr)); |
1da177e4 LT |
1401 | |
1402 | sk = asoc ? asoc->base.sk : NULL; | |
cea8768f | 1403 | retval = sctp_chunkify(skb, asoc, sk, gfp); |
1da177e4 LT |
1404 | if (!retval) { |
1405 | kfree_skb(skb); | |
1406 | goto nodata; | |
1407 | } | |
1408 | ||
1409 | retval->chunk_hdr = chunk_hdr; | |
922dbc5b | 1410 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); |
1da177e4 | 1411 | |
4cd57c80 VY |
1412 | /* Determine if the chunk needs to be authenticated */ |
1413 | if (sctp_auth_send_cid(type, asoc)) | |
1414 | retval->auth = 1; | |
1415 | ||
1da177e4 LT |
1416 | return retval; |
1417 | nodata: | |
1418 | return NULL; | |
1419 | } | |
1420 | ||
072017b4 | 1421 | static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, |
cea8768f | 1422 | __u8 flags, int paylen, gfp_t gfp) |
072017b4 | 1423 | { |
cea8768f | 1424 | return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); |
072017b4 VY |
1425 | } |
1426 | ||
ad05a7a0 XL |
1427 | struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc, |
1428 | __u8 flags, int paylen, gfp_t gfp) | |
1429 | { | |
1430 | return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp); | |
1431 | } | |
1432 | ||
072017b4 | 1433 | static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, |
cea8768f MRL |
1434 | __u8 type, __u8 flags, int paylen, |
1435 | gfp_t gfp) | |
072017b4 | 1436 | { |
cea8768f | 1437 | struct sctp_chunk *chunk; |
072017b4 | 1438 | |
cea8768f | 1439 | chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); |
072017b4 VY |
1440 | if (chunk) |
1441 | sctp_control_set_owner_w(chunk); | |
1442 | ||
1443 | return chunk; | |
1444 | } | |
1da177e4 LT |
1445 | |
1446 | /* Release the memory occupied by a chunk. */ | |
1447 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) | |
1448 | { | |
a08de64d VY |
1449 | BUG_ON(!list_empty(&chunk->list)); |
1450 | list_del_init(&chunk->transmitted_list); | |
1451 | ||
c485658b DB |
1452 | consume_skb(chunk->skb); |
1453 | consume_skb(chunk->auth_chunk); | |
1da177e4 LT |
1454 | |
1455 | SCTP_DBG_OBJCNT_DEC(chunk); | |
1456 | kmem_cache_free(sctp_chunk_cachep, chunk); | |
1457 | } | |
1458 | ||
1459 | /* Possibly, free the chunk. */ | |
1460 | void sctp_chunk_free(struct sctp_chunk *chunk) | |
1461 | { | |
1da177e4 LT |
1462 | /* Release our reference on the message tracker. */ |
1463 | if (chunk->msg) | |
1464 | sctp_datamsg_put(chunk->msg); | |
1465 | ||
1466 | sctp_chunk_put(chunk); | |
1467 | } | |
1468 | ||
1469 | /* Grab a reference to the chunk. */ | |
1470 | void sctp_chunk_hold(struct sctp_chunk *ch) | |
1471 | { | |
e7f02796 | 1472 | refcount_inc(&ch->refcnt); |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | /* Release a reference to the chunk. */ | |
1476 | void sctp_chunk_put(struct sctp_chunk *ch) | |
1477 | { | |
e7f02796 | 1478 | if (refcount_dec_and_test(&ch->refcnt)) |
1da177e4 LT |
1479 | sctp_chunk_destroy(ch); |
1480 | } | |
1481 | ||
1482 | /* Append bytes to the end of a chunk. Will panic if chunk is not big | |
1483 | * enough. | |
1484 | */ | |
1485 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) | |
1486 | { | |
1da177e4 | 1487 | int chunklen = ntohs(chunk->chunk_hdr->length); |
e2f036a9 | 1488 | int padlen = SCTP_PAD4(chunklen) - chunklen; |
327c0dab | 1489 | void *target; |
1da177e4 | 1490 | |
b952f4df | 1491 | skb_put_zero(chunk->skb, padlen); |
59ae1d12 | 1492 | target = skb_put_data(chunk->skb, data, len); |
1da177e4 LT |
1493 | |
1494 | /* Adjust the chunk length field. */ | |
1495 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); | |
27a884dc | 1496 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 LT |
1497 | |
1498 | return target; | |
1499 | } | |
1500 | ||
1501 | /* Append bytes from user space to the end of a chunk. Will panic if | |
1502 | * chunk is not big enough. | |
1503 | * Returns a kernel err value. | |
1504 | */ | |
e0eb093e AV |
1505 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
1506 | struct iov_iter *from) | |
1da177e4 | 1507 | { |
e0eb093e | 1508 | void *target; |
1da177e4 LT |
1509 | |
1510 | /* Make room in chunk for data. */ | |
1511 | target = skb_put(chunk->skb, len); | |
1512 | ||
1513 | /* Copy data (whole iovec) into chunk */ | |
3b6d4dbf | 1514 | if (!copy_from_iter_full(target, len, from)) |
e0eb093e | 1515 | return -EFAULT; |
1da177e4 LT |
1516 | |
1517 | /* Adjust the chunk length field. */ | |
1518 | chunk->chunk_hdr->length = | |
1519 | htons(ntohs(chunk->chunk_hdr->length) + len); | |
27a884dc | 1520 | chunk->chunk_end = skb_tail_pointer(chunk->skb); |
1da177e4 | 1521 | |
e0eb093e | 1522 | return 0; |
1da177e4 LT |
1523 | } |
1524 | ||
1525 | /* Helper function to assign a TSN if needed. This assumes that both | |
1526 | * the data_hdr and association have already been assigned. | |
1527 | */ | |
1528 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) | |
1529 | { | |
ab3e5e7b | 1530 | struct sctp_stream *stream; |
327c0dab XL |
1531 | struct sctp_chunk *lchunk; |
1532 | struct sctp_datamsg *msg; | |
1533 | __u16 ssn, sid; | |
1da177e4 LT |
1534 | |
1535 | if (chunk->has_ssn) | |
1536 | return; | |
1537 | ||
ab3e5e7b VY |
1538 | /* All fragments will be on the same stream */ |
1539 | sid = ntohs(chunk->subh.data_hdr->stream); | |
cee360ab | 1540 | stream = &chunk->asoc->stream; |
1da177e4 | 1541 | |
ab3e5e7b VY |
1542 | /* Now assign the sequence number to the entire message. |
1543 | * All fragments must have the same stream sequence number. | |
1544 | */ | |
1545 | msg = chunk->msg; | |
1546 | list_for_each_entry(lchunk, &msg->chunks, frag_list) { | |
1547 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { | |
1548 | ssn = 0; | |
1549 | } else { | |
1550 | if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) | |
a8386317 | 1551 | ssn = sctp_ssn_next(stream, out, sid); |
ab3e5e7b | 1552 | else |
a8386317 | 1553 | ssn = sctp_ssn_peek(stream, out, sid); |
ab3e5e7b VY |
1554 | } |
1555 | ||
1556 | lchunk->subh.data_hdr->ssn = htons(ssn); | |
1557 | lchunk->has_ssn = 1; | |
1558 | } | |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | /* Helper function to assign a TSN if needed. This assumes that both | |
1562 | * the data_hdr and association have already been assigned. | |
1563 | */ | |
1564 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) | |
1565 | { | |
1566 | if (!chunk->has_tsn) { | |
1567 | /* This is the last possible instant to | |
1568 | * assign a TSN. | |
1569 | */ | |
1570 | chunk->subh.data_hdr->tsn = | |
1571 | htonl(sctp_association_get_next_tsn(chunk->asoc)); | |
1572 | chunk->has_tsn = 1; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | /* Create a CLOSED association to use with an incoming packet. */ | |
1577 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, | |
327c0dab XL |
1578 | struct sctp_chunk *chunk, |
1579 | gfp_t gfp) | |
1da177e4 LT |
1580 | { |
1581 | struct sctp_association *asoc; | |
1c662018 | 1582 | enum sctp_scope scope; |
1da177e4 | 1583 | struct sk_buff *skb; |
1da177e4 LT |
1584 | |
1585 | /* Create the bare association. */ | |
1586 | scope = sctp_scope(sctp_source(chunk)); | |
1587 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1588 | if (!asoc) | |
1589 | goto nodata; | |
1590 | asoc->temp = 1; | |
1591 | skb = chunk->skb; | |
1592 | /* Create an entry for the source address of the packet. */ | |
e7487c86 MRL |
1593 | SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); |
1594 | ||
1da177e4 LT |
1595 | nodata: |
1596 | return asoc; | |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | /* Build a cookie representing asoc. | |
1600 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. | |
1601 | */ | |
f48ef4c7 XL |
1602 | static struct sctp_cookie_param *sctp_pack_cookie( |
1603 | const struct sctp_endpoint *ep, | |
1604 | const struct sctp_association *asoc, | |
1605 | const struct sctp_chunk *init_chunk, | |
327c0dab XL |
1606 | int *cookie_len, const __u8 *raw_addrs, |
1607 | int addrs_len) | |
1da177e4 | 1608 | { |
1da177e4 | 1609 | struct sctp_signed_cookie *cookie; |
f48ef4c7 | 1610 | struct sctp_cookie_param *retval; |
1da177e4 | 1611 | int headersize, bodysize; |
1da177e4 | 1612 | |
9834a2bb VY |
1613 | /* Header size is static data prior to the actual cookie, including |
1614 | * any padding. | |
1615 | */ | |
3c918704 | 1616 | headersize = sizeof(struct sctp_paramhdr) + |
d808ad9a | 1617 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1618 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1619 | bodysize = sizeof(struct sctp_cookie) |
1620 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; | |
1621 | ||
1622 | /* Pad out the cookie to a multiple to make the signature | |
1623 | * functions simpler to write. | |
1624 | */ | |
1625 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1626 | bodysize += SCTP_COOKIE_MULTIPLE | |
1627 | - (bodysize % SCTP_COOKIE_MULTIPLE); | |
1628 | *cookie_len = headersize + bodysize; | |
1629 | ||
1da177e4 LT |
1630 | /* Clear this memory since we are sending this data structure |
1631 | * out on the network. | |
1632 | */ | |
af997d8c ACM |
1633 | retval = kzalloc(*cookie_len, GFP_ATOMIC); |
1634 | if (!retval) | |
1635 | goto nodata; | |
1636 | ||
1da177e4 LT |
1637 | cookie = (struct sctp_signed_cookie *) retval->body; |
1638 | ||
1639 | /* Set up the parameter header. */ | |
1640 | retval->p.type = SCTP_PARAM_STATE_COOKIE; | |
1641 | retval->p.length = htons(*cookie_len); | |
1642 | ||
1643 | /* Copy the cookie part of the association itself. */ | |
1644 | cookie->c = asoc->c; | |
1645 | /* Save the raw address list length in the cookie. */ | |
1646 | cookie->c.raw_addr_list_len = addrs_len; | |
1647 | ||
1648 | /* Remember PR-SCTP capability. */ | |
1649 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; | |
1650 | ||
0f3fffd8 ISJ |
1651 | /* Save adaptation indication in the cookie. */ |
1652 | cookie->c.adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
1653 | |
1654 | /* Set an expiration time for the cookie. */ | |
52db882f | 1655 | cookie->c.expiration = ktime_add(asoc->cookie_life, |
cb5e173e | 1656 | ktime_get_real()); |
1da177e4 LT |
1657 | |
1658 | /* Copy the peer's init packet. */ | |
1659 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, | |
1660 | ntohs(init_chunk->chunk_hdr->length)); | |
1661 | ||
1662 | /* Copy the raw local address list of the association. */ | |
1663 | memcpy((__u8 *)&cookie->c.peer_init[0] + | |
1664 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); | |
1665 | ||
d808ad9a | 1666 | if (sctp_sk(ep->base.sk)->hmac) { |
5821c769 HX |
1667 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); |
1668 | int err; | |
1b489e11 | 1669 | |
1da177e4 | 1670 | /* Sign the message. */ |
5821c769 | 1671 | desc->tfm = sctp_sk(ep->base.sk)->hmac; |
5821c769 HX |
1672 | |
1673 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1674 | sizeof(ep->secret_key)) ?: | |
1675 | crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, | |
1676 | cookie->signature); | |
1677 | shash_desc_zero(desc); | |
1678 | if (err) | |
1b489e11 | 1679 | goto free_cookie; |
1da177e4 LT |
1680 | } |
1681 | ||
1da177e4 | 1682 | return retval; |
1b489e11 HX |
1683 | |
1684 | free_cookie: | |
1685 | kfree(retval); | |
1686 | nodata: | |
1687 | *cookie_len = 0; | |
1688 | return NULL; | |
1da177e4 LT |
1689 | } |
1690 | ||
1691 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ | |
1692 | struct sctp_association *sctp_unpack_cookie( | |
327c0dab XL |
1693 | const struct sctp_endpoint *ep, |
1694 | const struct sctp_association *asoc, | |
1695 | struct sctp_chunk *chunk, gfp_t gfp, | |
1696 | int *error, struct sctp_chunk **errp) | |
1da177e4 LT |
1697 | { |
1698 | struct sctp_association *retval = NULL; | |
327c0dab | 1699 | int headersize, bodysize, fixed_size; |
1da177e4 | 1700 | struct sctp_signed_cookie *cookie; |
327c0dab | 1701 | struct sk_buff *skb = chunk->skb; |
1da177e4 | 1702 | struct sctp_cookie *bear_cookie; |
313e7b4d | 1703 | __u8 *digest = ep->digest; |
1c662018 | 1704 | enum sctp_scope scope; |
327c0dab | 1705 | unsigned int len; |
52db882f | 1706 | ktime_t kt; |
1da177e4 | 1707 | |
9834a2bb VY |
1708 | /* Header size is static data prior to the actual cookie, including |
1709 | * any padding. | |
1710 | */ | |
922dbc5b | 1711 | headersize = sizeof(struct sctp_chunkhdr) + |
d808ad9a | 1712 | (sizeof(struct sctp_signed_cookie) - |
9834a2bb | 1713 | sizeof(struct sctp_cookie)); |
1da177e4 LT |
1714 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1715 | fixed_size = headersize + sizeof(struct sctp_cookie); | |
1716 | ||
1717 | /* Verify that the chunk looks like it even has a cookie. | |
1718 | * There must be enough room for our cookie and our peer's | |
1719 | * INIT chunk. | |
1720 | */ | |
1721 | len = ntohs(chunk->chunk_hdr->length); | |
1722 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) | |
1723 | goto malformed; | |
1724 | ||
1725 | /* Verify that the cookie has been padded out. */ | |
1726 | if (bodysize % SCTP_COOKIE_MULTIPLE) | |
1727 | goto malformed; | |
1728 | ||
1729 | /* Process the cookie. */ | |
1730 | cookie = chunk->subh.cookie_hdr; | |
1731 | bear_cookie = &cookie->c; | |
1732 | ||
1733 | if (!sctp_sk(ep->base.sk)->hmac) | |
1734 | goto no_hmac; | |
1735 | ||
1736 | /* Check the signature. */ | |
5821c769 HX |
1737 | { |
1738 | SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); | |
1739 | int err; | |
1740 | ||
1741 | desc->tfm = sctp_sk(ep->base.sk)->hmac; | |
5821c769 HX |
1742 | |
1743 | err = crypto_shash_setkey(desc->tfm, ep->secret_key, | |
1744 | sizeof(ep->secret_key)) ?: | |
1745 | crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, | |
1746 | digest); | |
1747 | shash_desc_zero(desc); | |
1748 | ||
1749 | if (err) { | |
1750 | *error = -SCTP_IERROR_NOMEM; | |
1751 | goto fail; | |
1752 | } | |
1b489e11 | 1753 | } |
1da177e4 LT |
1754 | |
1755 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { | |
570617e7 DB |
1756 | *error = -SCTP_IERROR_BAD_SIG; |
1757 | goto fail; | |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | no_hmac: | |
1761 | /* IG Section 2.35.2: | |
1762 | * 3) Compare the port numbers and the verification tag contained | |
1763 | * within the COOKIE ECHO chunk to the actual port numbers and the | |
1764 | * verification tag within the SCTP common header of the received | |
1765 | * packet. If these values do not match the packet MUST be silently | |
1766 | * discarded, | |
1767 | */ | |
1768 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { | |
1769 | *error = -SCTP_IERROR_BAD_TAG; | |
1770 | goto fail; | |
1771 | } | |
1772 | ||
9b1dfad0 | 1773 | if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || |
1da177e4 LT |
1774 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1775 | *error = -SCTP_IERROR_BAD_PORTS; | |
1776 | goto fail; | |
1777 | } | |
1778 | ||
1779 | /* Check to see if the cookie is stale. If there is already | |
1780 | * an association, there is no need to check cookie's expiration | |
1781 | * for init collision case of lost COOKIE ACK. | |
f236218b VY |
1782 | * If skb has been timestamped, then use the stamp, otherwise |
1783 | * use current time. This introduces a small possibility that | |
1784 | * that a cookie may be considered expired, but his would only slow | |
1785 | * down the new association establishment instead of every packet. | |
1da177e4 | 1786 | */ |
f236218b | 1787 | if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) |
52db882f | 1788 | kt = skb_get_ktime(skb); |
f236218b | 1789 | else |
cb5e173e | 1790 | kt = ktime_get_real(); |
f236218b | 1791 | |
67cb9366 | 1792 | if (!asoc && ktime_before(bear_cookie->expiration, kt)) { |
8914f4ba MRL |
1793 | suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); |
1794 | __be32 n = htonl(usecs); | |
1795 | ||
1da177e4 LT |
1796 | /* |
1797 | * Section 3.3.10.3 Stale Cookie Error (3) | |
1798 | * | |
1799 | * Cause of error | |
1800 | * --------------- | |
1801 | * Stale Cookie Error: Indicates the receipt of a valid State | |
1802 | * Cookie that has expired. | |
1803 | */ | |
8914f4ba MRL |
1804 | *errp = sctp_make_op_error(asoc, chunk, |
1805 | SCTP_ERROR_STALE_COOKIE, &n, | |
1806 | sizeof(n), 0); | |
1807 | if (*errp) | |
1da177e4 | 1808 | *error = -SCTP_IERROR_STALE_COOKIE; |
8914f4ba | 1809 | else |
1da177e4 LT |
1810 | *error = -SCTP_IERROR_NOMEM; |
1811 | ||
1812 | goto fail; | |
1813 | } | |
1814 | ||
1815 | /* Make a new base association. */ | |
1816 | scope = sctp_scope(sctp_source(chunk)); | |
1817 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); | |
1818 | if (!retval) { | |
1819 | *error = -SCTP_IERROR_NOMEM; | |
1820 | goto fail; | |
1821 | } | |
1822 | ||
1823 | /* Set up our peer's port number. */ | |
1824 | retval->peer.port = ntohs(chunk->sctp_hdr->source); | |
1825 | ||
1826 | /* Populate the association from the cookie. */ | |
1827 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); | |
1828 | ||
1829 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, | |
1830 | GFP_ATOMIC) < 0) { | |
1831 | *error = -SCTP_IERROR_NOMEM; | |
1832 | goto fail; | |
1833 | } | |
1834 | ||
1835 | /* Also, add the destination address. */ | |
1836 | if (list_empty(&retval->base.bind_addr.address_list)) { | |
f57d96b2 | 1837 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
133800d1 MRL |
1838 | sizeof(chunk->dest), SCTP_ADDR_SRC, |
1839 | GFP_ATOMIC); | |
1da177e4 LT |
1840 | } |
1841 | ||
1842 | retval->next_tsn = retval->c.initial_tsn; | |
1843 | retval->ctsn_ack_point = retval->next_tsn - 1; | |
1844 | retval->addip_serial = retval->c.initial_tsn; | |
cc16f00f | 1845 | retval->strreset_outseq = retval->c.initial_tsn; |
1da177e4 LT |
1846 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1847 | retval->peer.prsctp_capable = retval->c.prsctp_capable; | |
0f3fffd8 | 1848 | retval->peer.adaptation_ind = retval->c.adaptation_ind; |
1da177e4 LT |
1849 | |
1850 | /* The INIT stuff will be done by the side effects. */ | |
1851 | return retval; | |
1852 | ||
1853 | fail: | |
1854 | if (retval) | |
1855 | sctp_association_free(retval); | |
1856 | ||
1857 | return NULL; | |
1858 | ||
1859 | malformed: | |
1860 | /* Yikes! The packet is either corrupt or deliberately | |
1861 | * malformed. | |
1862 | */ | |
1863 | *error = -SCTP_IERROR_MALFORMED; | |
1864 | goto fail; | |
1865 | } | |
1866 | ||
1867 | /******************************************************************** | |
1868 | * 3rd Level Abstractions | |
1869 | ********************************************************************/ | |
1870 | ||
1871 | struct __sctp_missing { | |
9f81bcd9 AV |
1872 | __be32 num_missing; |
1873 | __be16 type; | |
bc10502d | 1874 | } __packed; |
1da177e4 LT |
1875 | |
1876 | /* | |
1877 | * Report a missing mandatory parameter. | |
1878 | */ | |
1879 | static int sctp_process_missing_param(const struct sctp_association *asoc, | |
34b4e29b | 1880 | enum sctp_param paramtype, |
1da177e4 LT |
1881 | struct sctp_chunk *chunk, |
1882 | struct sctp_chunk **errp) | |
1883 | { | |
1884 | struct __sctp_missing report; | |
1885 | __u16 len; | |
1886 | ||
e2f036a9 | 1887 | len = SCTP_PAD4(sizeof(report)); |
1da177e4 LT |
1888 | |
1889 | /* Make an ERROR chunk, preparing enough room for | |
1890 | * returning multiple unknown parameters. | |
1891 | */ | |
1892 | if (!*errp) | |
1893 | *errp = sctp_make_op_error_space(asoc, chunk, len); | |
1894 | ||
1895 | if (*errp) { | |
1896 | report.num_missing = htonl(1); | |
1897 | report.type = paramtype; | |
ebdfcad4 | 1898 | sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, |
00f1c2df WY |
1899 | sizeof(report)); |
1900 | sctp_addto_chunk(*errp, sizeof(report), &report); | |
1da177e4 LT |
1901 | } |
1902 | ||
1903 | /* Stop processing this chunk. */ | |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | /* Report an Invalid Mandatory Parameter. */ | |
1908 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, | |
1909 | struct sctp_chunk *chunk, | |
1910 | struct sctp_chunk **errp) | |
1911 | { | |
1912 | /* Invalid Mandatory Parameter Error has no payload. */ | |
1913 | ||
1914 | if (!*errp) | |
1915 | *errp = sctp_make_op_error_space(asoc, chunk, 0); | |
1916 | ||
1917 | if (*errp) | |
00f1c2df | 1918 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); |
1da177e4 LT |
1919 | |
1920 | /* Stop processing this chunk. */ | |
1921 | return 0; | |
1922 | } | |
1923 | ||
1924 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, | |
1925 | struct sctp_paramhdr *param, | |
1926 | const struct sctp_chunk *chunk, | |
1927 | struct sctp_chunk **errp) | |
1928 | { | |
7ab90804 VY |
1929 | /* This is a fatal error. Any accumulated non-fatal errors are |
1930 | * not reported. | |
1931 | */ | |
1932 | if (*errp) | |
1933 | sctp_chunk_free(*errp); | |
1934 | ||
1da177e4 | 1935 | /* Create an error chunk and fill it in with our payload. */ |
ba016670 | 1936 | *errp = sctp_make_violation_paramlen(asoc, chunk, param); |
1da177e4 LT |
1937 | |
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | ||
1942 | /* Do not attempt to handle the HOST_NAME parm. However, do | |
1943 | * send back an indicator to the peer. | |
1944 | */ | |
1945 | static int sctp_process_hn_param(const struct sctp_association *asoc, | |
1946 | union sctp_params param, | |
1947 | struct sctp_chunk *chunk, | |
1948 | struct sctp_chunk **errp) | |
1949 | { | |
1950 | __u16 len = ntohs(param.p->length); | |
1951 | ||
7ab90804 VY |
1952 | /* Processing of the HOST_NAME parameter will generate an |
1953 | * ABORT. If we've accumulated any non-fatal errors, they | |
1954 | * would be unrecognized parameters and we should not include | |
1955 | * them in the ABORT. | |
1956 | */ | |
1957 | if (*errp) | |
1958 | sctp_chunk_free(*errp); | |
1959 | ||
8914f4ba MRL |
1960 | *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED, |
1961 | param.v, len, 0); | |
1da177e4 LT |
1962 | |
1963 | /* Stop processing this chunk. */ | |
1964 | return 0; | |
1965 | } | |
1966 | ||
f53b5b09 | 1967 | static int sctp_verify_ext_param(struct net *net, union sctp_params param) |
d6701191 | 1968 | { |
3c918704 | 1969 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
d6701191 | 1970 | int have_asconf = 0; |
327c0dab | 1971 | int have_auth = 0; |
d6701191 VY |
1972 | int i; |
1973 | ||
1974 | for (i = 0; i < num_ext; i++) { | |
1975 | switch (param.ext->chunks[i]) { | |
f7010e61 | 1976 | case SCTP_CID_AUTH: |
1977 | have_auth = 1; | |
1978 | break; | |
1979 | case SCTP_CID_ASCONF: | |
1980 | case SCTP_CID_ASCONF_ACK: | |
1981 | have_asconf = 1; | |
1982 | break; | |
d6701191 VY |
1983 | } |
1984 | } | |
1985 | ||
1986 | /* ADD-IP Security: The draft requires us to ABORT or ignore the | |
1987 | * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this | |
1988 | * only if ADD-IP is turned on and we are not backward-compatible | |
1989 | * mode. | |
1990 | */ | |
e1fc3b14 | 1991 | if (net->sctp.addip_noauth) |
d6701191 VY |
1992 | return 1; |
1993 | ||
e1fc3b14 | 1994 | if (net->sctp.addip_enable && !have_auth && have_asconf) |
d6701191 VY |
1995 | return 0; |
1996 | ||
1997 | return 1; | |
1998 | } | |
1999 | ||
131a47e3 | 2000 | static void sctp_process_ext_param(struct sctp_association *asoc, |
327c0dab | 2001 | union sctp_params param) |
131a47e3 | 2002 | { |
3c918704 | 2003 | __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
327c0dab | 2004 | struct net *net = sock_net(asoc->base.sk); |
131a47e3 VY |
2005 | int i; |
2006 | ||
2007 | for (i = 0; i < num_ext; i++) { | |
2008 | switch (param.ext->chunks[i]) { | |
c28445c3 XL |
2009 | case SCTP_CID_RECONF: |
2010 | if (asoc->reconf_enable && | |
2011 | !asoc->peer.reconf_capable) | |
2012 | asoc->peer.reconf_capable = 1; | |
2013 | break; | |
f7010e61 | 2014 | case SCTP_CID_FWD_TSN: |
28aa4c26 XL |
2015 | if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) |
2016 | asoc->peer.prsctp_capable = 1; | |
f7010e61 | 2017 | break; |
2018 | case SCTP_CID_AUTH: | |
2019 | /* if the peer reports AUTH, assume that he | |
2020 | * supports AUTH. | |
2021 | */ | |
b14878cc | 2022 | if (asoc->ep->auth_enable) |
f7010e61 | 2023 | asoc->peer.auth_capable = 1; |
2024 | break; | |
2025 | case SCTP_CID_ASCONF: | |
2026 | case SCTP_CID_ASCONF_ACK: | |
2027 | if (net->sctp.addip_enable) | |
2028 | asoc->peer.asconf_capable = 1; | |
2029 | break; | |
96b120b3 XL |
2030 | case SCTP_CID_I_DATA: |
2031 | if (sctp_sk(asoc->base.sk)->strm_interleave) | |
2032 | asoc->intl_enable = 1; | |
2033 | break; | |
f7010e61 | 2034 | default: |
2035 | break; | |
131a47e3 VY |
2036 | } |
2037 | } | |
2038 | } | |
2039 | ||
1da177e4 LT |
2040 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
2041 | * | |
2042 | * The Parameter Types are encoded such that the | |
2043 | * highest-order two bits specify the action that must be | |
2044 | * taken if the processing endpoint does not recognize the | |
2045 | * Parameter Type. | |
2046 | * | |
7ab90804 VY |
2047 | * 00 - Stop processing this parameter; do not process any further |
2048 | * parameters within this chunk | |
1da177e4 | 2049 | * |
7ab90804 VY |
2050 | * 01 - Stop processing this parameter, do not process any further |
2051 | * parameters within this chunk, and report the unrecognized | |
2052 | * parameter in an 'Unrecognized Parameter' ERROR chunk. | |
1da177e4 LT |
2053 | * |
2054 | * 10 - Skip this parameter and continue processing. | |
2055 | * | |
2056 | * 11 - Skip this parameter and continue processing but | |
2057 | * report the unrecognized parameter in an | |
7ab90804 | 2058 | * 'Unrecognized Parameter' ERROR chunk. |
1da177e4 LT |
2059 | * |
2060 | * Return value: | |
7ab90804 VY |
2061 | * SCTP_IERROR_NO_ERROR - continue with the chunk |
2062 | * SCTP_IERROR_ERROR - stop and report an error. | |
2063 | * SCTP_IERROR_NOMEME - out of memory. | |
1da177e4 | 2064 | */ |
4785c7ae XL |
2065 | static enum sctp_ierror sctp_process_unk_param( |
2066 | const struct sctp_association *asoc, | |
2067 | union sctp_params param, | |
2068 | struct sctp_chunk *chunk, | |
2069 | struct sctp_chunk **errp) | |
1da177e4 | 2070 | { |
7ab90804 | 2071 | int retval = SCTP_IERROR_NO_ERROR; |
1da177e4 LT |
2072 | |
2073 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { | |
2074 | case SCTP_PARAM_ACTION_DISCARD: | |
7ab90804 | 2075 | retval = SCTP_IERROR_ERROR; |
1da177e4 LT |
2076 | break; |
2077 | case SCTP_PARAM_ACTION_SKIP: | |
2078 | break; | |
7ab90804 VY |
2079 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
2080 | retval = SCTP_IERROR_ERROR; | |
2081 | /* Fall through */ | |
1da177e4 LT |
2082 | case SCTP_PARAM_ACTION_SKIP_ERR: |
2083 | /* Make an ERROR chunk, preparing enough room for | |
2084 | * returning multiple unknown parameters. | |
2085 | */ | |
8914f4ba MRL |
2086 | if (!*errp) { |
2087 | *errp = sctp_make_op_error_limited(asoc, chunk); | |
2088 | if (!*errp) { | |
2089 | /* If there is no memory for generating the | |
2090 | * ERROR report as specified, an ABORT will be | |
2091 | * triggered to the peer and the association | |
2092 | * won't be established. | |
2093 | */ | |
2094 | retval = SCTP_IERROR_NOMEM; | |
2095 | break; | |
2096 | } | |
1da177e4 | 2097 | } |
8914f4ba MRL |
2098 | |
2099 | if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, | |
2100 | ntohs(param.p->length))) | |
2101 | sctp_addto_chunk(*errp, ntohs(param.p->length), | |
2102 | param.v); | |
1da177e4 LT |
2103 | break; |
2104 | default: | |
2105 | break; | |
2106 | } | |
2107 | ||
2108 | return retval; | |
2109 | } | |
2110 | ||
7ab90804 | 2111 | /* Verify variable length parameters |
1da177e4 | 2112 | * Return values: |
7ab90804 VY |
2113 | * SCTP_IERROR_ABORT - trigger an ABORT |
2114 | * SCTP_IERROR_NOMEM - out of memory (abort) | |
2115 | * SCTP_IERROR_ERROR - stop processing, trigger an ERROR | |
2116 | * SCTP_IERROR_NO_ERROR - continue with the chunk | |
1da177e4 | 2117 | */ |
4785c7ae XL |
2118 | static enum sctp_ierror sctp_verify_param(struct net *net, |
2119 | const struct sctp_endpoint *ep, | |
2120 | const struct sctp_association *asoc, | |
2121 | union sctp_params param, | |
2122 | enum sctp_cid cid, | |
2123 | struct sctp_chunk *chunk, | |
2124 | struct sctp_chunk **err_chunk) | |
1da177e4 | 2125 | { |
72da7b38 | 2126 | struct sctp_hmac_algo_param *hmacs; |
7ab90804 | 2127 | int retval = SCTP_IERROR_NO_ERROR; |
72da7b38 WY |
2128 | __u16 n_elt, id = 0; |
2129 | int i; | |
1da177e4 LT |
2130 | |
2131 | /* FIXME - This routine is not looking at each parameter per the | |
2132 | * chunk type, i.e., unrecognized parameters should be further | |
2133 | * identified based on the chunk id. | |
2134 | */ | |
2135 | ||
2136 | switch (param.p->type) { | |
2137 | case SCTP_PARAM_IPV4_ADDRESS: | |
2138 | case SCTP_PARAM_IPV6_ADDRESS: | |
2139 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
2140 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2141 | case SCTP_PARAM_STATE_COOKIE: | |
2142 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2143 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2144 | case SCTP_PARAM_ECN_CAPABLE: | |
0f3fffd8 | 2145 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
d6701191 VY |
2146 | break; |
2147 | ||
131a47e3 | 2148 | case SCTP_PARAM_SUPPORTED_EXT: |
f53b5b09 | 2149 | if (!sctp_verify_ext_param(net, param)) |
d6701191 | 2150 | return SCTP_IERROR_ABORT; |
1da177e4 LT |
2151 | break; |
2152 | ||
d6de3097 | 2153 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2154 | if (net->sctp.addip_enable) |
d6de3097 VY |
2155 | break; |
2156 | goto fallthrough; | |
2157 | ||
1da177e4 LT |
2158 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2159 | /* Tell the peer, we won't support this param. */ | |
7ab90804 VY |
2160 | sctp_process_hn_param(asoc, param, chunk, err_chunk); |
2161 | retval = SCTP_IERROR_ABORT; | |
2162 | break; | |
131a47e3 | 2163 | |
1da177e4 | 2164 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2165 | if (ep->prsctp_enable) |
1da177e4 | 2166 | break; |
730fc3d0 VY |
2167 | goto fallthrough; |
2168 | ||
2169 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2170 | if (!ep->auth_enable) |
730fc3d0 VY |
2171 | goto fallthrough; |
2172 | ||
2173 | /* SCTP-AUTH: Secion 6.1 | |
2174 | * If the random number is not 32 byte long the association | |
2175 | * MUST be aborted. The ABORT chunk SHOULD contain the error | |
2176 | * cause 'Protocol Violation'. | |
2177 | */ | |
8914f4ba MRL |
2178 | if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) - |
2179 | sizeof(struct sctp_paramhdr)) { | |
7ab90804 | 2180 | sctp_process_inv_paramlength(asoc, param.p, |
8914f4ba | 2181 | chunk, err_chunk); |
7ab90804 VY |
2182 | retval = SCTP_IERROR_ABORT; |
2183 | } | |
730fc3d0 VY |
2184 | break; |
2185 | ||
2186 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2187 | if (!ep->auth_enable) |
730fc3d0 VY |
2188 | goto fallthrough; |
2189 | ||
2190 | /* SCTP-AUTH: Section 3.2 | |
2191 | * The CHUNKS parameter MUST be included once in the INIT or | |
2192 | * INIT-ACK chunk if the sender wants to receive authenticated | |
2193 | * chunks. Its maximum length is 260 bytes. | |
2194 | */ | |
7ab90804 VY |
2195 | if (260 < ntohs(param.p->length)) { |
2196 | sctp_process_inv_paramlength(asoc, param.p, | |
2197 | chunk, err_chunk); | |
2198 | retval = SCTP_IERROR_ABORT; | |
2199 | } | |
730fc3d0 VY |
2200 | break; |
2201 | ||
2202 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2203 | if (!ep->auth_enable) |
72da7b38 WY |
2204 | goto fallthrough; |
2205 | ||
2206 | hmacs = (struct sctp_hmac_algo_param *)param.p; | |
3c918704 XL |
2207 | n_elt = (ntohs(param.p->length) - |
2208 | sizeof(struct sctp_paramhdr)) >> 1; | |
72da7b38 WY |
2209 | |
2210 | /* SCTP-AUTH: Section 6.1 | |
2211 | * The HMAC algorithm based on SHA-1 MUST be supported and | |
2212 | * included in the HMAC-ALGO parameter. | |
2213 | */ | |
2214 | for (i = 0; i < n_elt; i++) { | |
2215 | id = ntohs(hmacs->hmac_ids[i]); | |
2216 | ||
2217 | if (id == SCTP_AUTH_HMAC_ID_SHA1) | |
2218 | break; | |
2219 | } | |
2220 | ||
2221 | if (id != SCTP_AUTH_HMAC_ID_SHA1) { | |
2222 | sctp_process_inv_paramlength(asoc, param.p, chunk, | |
2223 | err_chunk); | |
2224 | retval = SCTP_IERROR_ABORT; | |
2225 | } | |
2226 | break; | |
730fc3d0 | 2227 | fallthrough: |
1da177e4 | 2228 | default: |
bb33381d DB |
2229 | pr_debug("%s: unrecognized param:%d for chunk:%d\n", |
2230 | __func__, ntohs(param.p->type), cid); | |
2231 | ||
7ab90804 | 2232 | retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1da177e4 LT |
2233 | break; |
2234 | } | |
2235 | return retval; | |
2236 | } | |
2237 | ||
2238 | /* Verify the INIT packet before we process it. */ | |
b14878cc | 2239 | int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
6d85e68f | 2240 | const struct sctp_association *asoc, enum sctp_cid cid, |
01a992be XL |
2241 | struct sctp_init_chunk *peer_init, |
2242 | struct sctp_chunk *chunk, struct sctp_chunk **errp) | |
1da177e4 LT |
2243 | { |
2244 | union sctp_params param; | |
7613f5fe | 2245 | bool has_cookie = false; |
7ab90804 | 2246 | int result; |
1da177e4 | 2247 | |
7613f5fe DB |
2248 | /* Check for missing mandatory parameters. Note: Initial TSN is |
2249 | * also mandatory, but is not checked here since the valid range | |
2250 | * is 0..2**32-1. RFC4960, section 3.3.3. | |
2251 | */ | |
2252 | if (peer_init->init_hdr.num_outbound_streams == 0 || | |
2253 | peer_init->init_hdr.num_inbound_streams == 0 || | |
2254 | peer_init->init_hdr.init_tag == 0 || | |
2255 | ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) | |
7ab90804 | 2256 | return sctp_process_inv_mandatory(asoc, chunk, errp); |
1da177e4 | 2257 | |
1da177e4 | 2258 | sctp_walk_params(param, peer_init, init_hdr.params) { |
7613f5fe DB |
2259 | if (param.p->type == SCTP_PARAM_STATE_COOKIE) |
2260 | has_cookie = true; | |
2261 | } | |
1da177e4 LT |
2262 | |
2263 | /* There is a possibility that a parameter length was bad and | |
2264 | * in that case we would have stoped walking the parameters. | |
2265 | * The current param.p would point at the bad one. | |
2266 | * Current consensus on the mailing list is to generate a PROTOCOL | |
2267 | * VIOLATION error. We build the ERROR chunk here and let the normal | |
2268 | * error handling code build and send the packet. | |
2269 | */ | |
26ac8e5f | 2270 | if (param.v != (void *)chunk->chunk_end) |
7ab90804 | 2271 | return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1da177e4 LT |
2272 | |
2273 | /* The only missing mandatory param possible today is | |
2274 | * the state cookie for an INIT-ACK chunk. | |
2275 | */ | |
7ab90804 VY |
2276 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) |
2277 | return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, | |
2278 | chunk, errp); | |
1da177e4 | 2279 | |
7ab90804 | 2280 | /* Verify all the variable length parameters */ |
1da177e4 | 2281 | sctp_walk_params(param, peer_init, init_hdr.params) { |
b14878cc VY |
2282 | result = sctp_verify_param(net, ep, asoc, param, cid, |
2283 | chunk, errp); | |
7ab90804 | 2284 | switch (result) { |
f7010e61 | 2285 | case SCTP_IERROR_ABORT: |
2286 | case SCTP_IERROR_NOMEM: | |
2287 | return 0; | |
2288 | case SCTP_IERROR_ERROR: | |
2289 | return 1; | |
2290 | case SCTP_IERROR_NO_ERROR: | |
2291 | default: | |
2292 | break; | |
1da177e4 LT |
2293 | } |
2294 | ||
2295 | } /* for (loop through all parameters) */ | |
2296 | ||
2297 | return 1; | |
2298 | } | |
2299 | ||
2300 | /* Unpack the parameters in an INIT packet into an association. | |
2301 | * Returns 0 on failure, else success. | |
2302 | * FIXME: This is an association method. | |
2303 | */ | |
de6becdc | 2304 | int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, |
1da177e4 | 2305 | const union sctp_addr *peer_addr, |
01a992be | 2306 | struct sctp_init_chunk *peer_init, gfp_t gfp) |
1da177e4 | 2307 | { |
e1fc3b14 | 2308 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
2309 | struct sctp_transport *transport; |
2310 | struct list_head *pos, *temp; | |
327c0dab | 2311 | union sctp_params param; |
de6becdc | 2312 | union sctp_addr addr; |
327c0dab | 2313 | struct sctp_af *af; |
de6becdc | 2314 | int src_match = 0; |
327c0dab | 2315 | char *cookie; |
1da177e4 LT |
2316 | |
2317 | /* We must include the address that the INIT packet came from. | |
2318 | * This is the only address that matters for an INIT packet. | |
2319 | * When processing a COOKIE ECHO, we retrieve the from address | |
2320 | * of the INIT from the cookie. | |
2321 | */ | |
2322 | ||
2323 | /* This implementation defaults to making the first transport | |
2324 | * added as the primary transport. The source address seems to | |
2325 | * be a a better choice than any of the embedded addresses. | |
2326 | */ | |
cb3f837b | 2327 | if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) |
de6becdc WY |
2328 | goto nomem; |
2329 | ||
2330 | if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) | |
2331 | src_match = 1; | |
1da177e4 LT |
2332 | |
2333 | /* Process the initialization parameters. */ | |
1da177e4 | 2334 | sctp_walk_params(param, peer_init, init_hdr.params) { |
de6becdc WY |
2335 | if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || |
2336 | param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { | |
2337 | af = sctp_get_af_specific(param_type2af(param.p->type)); | |
2338 | af->from_addr_param(&addr, param.addr, | |
2339 | chunk->sctp_hdr->source, 0); | |
2340 | if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) | |
2341 | src_match = 1; | |
2342 | } | |
1da177e4 LT |
2343 | |
2344 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) | |
d808ad9a | 2345 | goto clean_up; |
1da177e4 LT |
2346 | } |
2347 | ||
de6becdc WY |
2348 | /* source address of chunk may not match any valid address */ |
2349 | if (!src_match) | |
2350 | goto clean_up; | |
2351 | ||
730fc3d0 VY |
2352 | /* AUTH: After processing the parameters, make sure that we |
2353 | * have all the required info to potentially do authentications. | |
2354 | */ | |
2355 | if (asoc->peer.auth_capable && (!asoc->peer.peer_random || | |
2356 | !asoc->peer.peer_hmacs)) | |
2357 | asoc->peer.auth_capable = 0; | |
2358 | ||
d6701191 VY |
2359 | /* In a non-backward compatible mode, if the peer claims |
2360 | * support for ADD-IP but not AUTH, the ADD-IP spec states | |
2361 | * that we MUST ABORT the association. Section 6. The section | |
2362 | * also give us an option to silently ignore the packet, which | |
2363 | * is what we'll do here. | |
6b2f9cb6 | 2364 | */ |
e1fc3b14 | 2365 | if (!net->sctp.addip_noauth && |
73d9c4fd | 2366 | (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { |
6b2f9cb6 VY |
2367 | asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | |
2368 | SCTP_PARAM_DEL_IP | | |
2369 | SCTP_PARAM_SET_PRIMARY); | |
88799fe5 | 2370 | asoc->peer.asconf_capable = 0; |
d6701191 | 2371 | goto clean_up; |
6b2f9cb6 VY |
2372 | } |
2373 | ||
3f7a87d2 FF |
2374 | /* Walk list of transports, removing transports in the UNKNOWN state. */ |
2375 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2376 | transport = list_entry(pos, struct sctp_transport, transports); | |
2377 | if (transport->state == SCTP_UNKNOWN) { | |
2378 | sctp_assoc_rm_peer(asoc, transport); | |
2379 | } | |
2380 | } | |
2381 | ||
1da177e4 LT |
2382 | /* The fixed INIT headers are always in network byte |
2383 | * order. | |
2384 | */ | |
2385 | asoc->peer.i.init_tag = | |
2386 | ntohl(peer_init->init_hdr.init_tag); | |
2387 | asoc->peer.i.a_rwnd = | |
2388 | ntohl(peer_init->init_hdr.a_rwnd); | |
2389 | asoc->peer.i.num_outbound_streams = | |
2390 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2391 | asoc->peer.i.num_inbound_streams = | |
2392 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2393 | asoc->peer.i.initial_tsn = | |
2394 | ntohl(peer_init->init_hdr.initial_tsn); | |
2395 | ||
cc16f00f XL |
2396 | asoc->strreset_inseq = asoc->peer.i.initial_tsn; |
2397 | ||
1da177e4 LT |
2398 | /* Apply the upper bounds for output streams based on peer's |
2399 | * number of inbound streams. | |
2400 | */ | |
2401 | if (asoc->c.sinit_num_ostreams > | |
2402 | ntohs(peer_init->init_hdr.num_inbound_streams)) { | |
2403 | asoc->c.sinit_num_ostreams = | |
2404 | ntohs(peer_init->init_hdr.num_inbound_streams); | |
2405 | } | |
2406 | ||
2407 | if (asoc->c.sinit_max_instreams > | |
2408 | ntohs(peer_init->init_hdr.num_outbound_streams)) { | |
2409 | asoc->c.sinit_max_instreams = | |
2410 | ntohs(peer_init->init_hdr.num_outbound_streams); | |
2411 | } | |
2412 | ||
2413 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ | |
2414 | asoc->c.peer_vtag = asoc->peer.i.init_tag; | |
2415 | ||
2416 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ | |
2417 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; | |
2418 | ||
2419 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ | |
2420 | cookie = asoc->peer.cookie; | |
2421 | if (cookie) { | |
af997d8c | 2422 | asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); |
1da177e4 LT |
2423 | if (!asoc->peer.cookie) |
2424 | goto clean_up; | |
1da177e4 LT |
2425 | } |
2426 | ||
2427 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily | |
2428 | * high (for example, implementations MAY use the size of the receiver | |
2429 | * advertised window). | |
2430 | */ | |
9dbc15f0 RD |
2431 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
2432 | transports) { | |
1da177e4 LT |
2433 | transport->ssthresh = asoc->peer.i.a_rwnd; |
2434 | } | |
2435 | ||
2436 | /* Set up the TSN tracking pieces. */ | |
8e1ee18c VY |
2437 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
2438 | asoc->peer.i.initial_tsn, gfp)) | |
2439 | goto clean_up; | |
1da177e4 LT |
2440 | |
2441 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
2442 | * | |
2443 | * The stream sequence number in all the streams shall start | |
2444 | * from 0 when the association is established. Also, when the | |
2445 | * stream sequence number reaches the value 65535 the next | |
2446 | * stream sequence number shall be set to 0. | |
2447 | */ | |
2448 | ||
ff356414 XL |
2449 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
2450 | asoc->c.sinit_max_instreams, gfp)) | |
7e062977 | 2451 | goto clean_up; |
1da177e4 | 2452 | |
4135cce7 XL |
2453 | /* Update frag_point when stream_interleave may get changed. */ |
2454 | sctp_assoc_update_frag_point(asoc); | |
2455 | ||
7e062977 XL |
2456 | if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) |
2457 | goto clean_up; | |
1da177e4 LT |
2458 | |
2459 | /* ADDIP Section 4.1 ASCONF Chunk Procedures | |
2460 | * | |
2461 | * When an endpoint has an ASCONF signaled change to be sent to the | |
2462 | * remote endpoint it should do the following: | |
2463 | * ... | |
2464 | * A2) A serial number should be assigned to the Chunk. The serial | |
2465 | * number should be a monotonically increasing number. All serial | |
2466 | * numbers are defined to be initialized at the start of the | |
2467 | * association to the same value as the Initial TSN. | |
2468 | */ | |
2469 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; | |
2470 | return 1; | |
2471 | ||
2472 | clean_up: | |
2473 | /* Release the transport structures. */ | |
2474 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
2475 | transport = list_entry(pos, struct sctp_transport, transports); | |
add52379 VY |
2476 | if (transport->state != SCTP_ACTIVE) |
2477 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 | 2478 | } |
3f7a87d2 | 2479 | |
1da177e4 LT |
2480 | nomem: |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | ||
2485 | /* Update asoc with the option described in param. | |
2486 | * | |
2487 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT | |
2488 | * | |
2489 | * asoc is the association to update. | |
2490 | * param is the variable length parameter to use for update. | |
2491 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. | |
2492 | * If the current packet is an INIT we want to minimize the amount of | |
2493 | * work we do. In particular, we should not build transport | |
2494 | * structures for the addresses. | |
2495 | */ | |
2496 | static int sctp_process_param(struct sctp_association *asoc, | |
2497 | union sctp_params param, | |
2498 | const union sctp_addr *peer_addr, | |
dd0fc66f | 2499 | gfp_t gfp) |
1da177e4 | 2500 | { |
e7ff4a70 | 2501 | struct net *net = sock_net(asoc->base.sk); |
327c0dab | 2502 | struct sctp_endpoint *ep = asoc->ep; |
d6de3097 VY |
2503 | union sctp_addr_param *addr_param; |
2504 | struct sctp_transport *t; | |
327c0dab XL |
2505 | enum sctp_scope scope; |
2506 | union sctp_addr addr; | |
2507 | struct sctp_af *af; | |
2508 | int retval = 1, i; | |
2509 | u32 stale; | |
2510 | __u16 sat; | |
1da177e4 LT |
2511 | |
2512 | /* We maintain all INIT parameters in network byte order all the | |
2513 | * time. This allows us to not worry about whether the parameters | |
2514 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. | |
2515 | */ | |
2516 | switch (param.p->type) { | |
2517 | case SCTP_PARAM_IPV6_ADDRESS: | |
2518 | if (PF_INET6 != asoc->base.sk->sk_family) | |
2519 | break; | |
7dab83de VY |
2520 | goto do_addr_param; |
2521 | ||
1da177e4 | 2522 | case SCTP_PARAM_IPV4_ADDRESS: |
7dab83de VY |
2523 | /* v4 addresses are not allowed on v6-only socket */ |
2524 | if (ipv6_only_sock(asoc->base.sk)) | |
2525 | break; | |
2526 | do_addr_param: | |
1da177e4 | 2527 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
dd86d136 | 2528 | af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); |
1da177e4 | 2529 | scope = sctp_scope(peer_addr); |
e7ff4a70 | 2530 | if (sctp_in_scope(net, &addr, scope)) |
dd86d136 | 2531 | if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) |
1da177e4 LT |
2532 | return 0; |
2533 | break; | |
2534 | ||
2535 | case SCTP_PARAM_COOKIE_PRESERVATIVE: | |
e1fc3b14 | 2536 | if (!net->sctp.cookie_preserve_enable) |
1da177e4 LT |
2537 | break; |
2538 | ||
2539 | stale = ntohl(param.life->lifespan_increment); | |
2540 | ||
2541 | /* Suggested Cookie Life span increment's unit is msec, | |
2542 | * (1/1000sec). | |
2543 | */ | |
52db882f | 2544 | asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); |
1da177e4 LT |
2545 | break; |
2546 | ||
2547 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
bb33381d | 2548 | pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); |
1da177e4 LT |
2549 | break; |
2550 | ||
2551 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: | |
2552 | /* Turn off the default values first so we'll know which | |
2553 | * ones are really set by the peer. | |
2554 | */ | |
2555 | asoc->peer.ipv4_address = 0; | |
2556 | asoc->peer.ipv6_address = 0; | |
2557 | ||
140ee960 GJ |
2558 | /* Assume that peer supports the address family |
2559 | * by which it sends a packet. | |
2560 | */ | |
2561 | if (peer_addr->sa.sa_family == AF_INET6) | |
2562 | asoc->peer.ipv6_address = 1; | |
2563 | else if (peer_addr->sa.sa_family == AF_INET) | |
2564 | asoc->peer.ipv4_address = 1; | |
2565 | ||
1da177e4 | 2566 | /* Cycle through address types; avoid divide by 0. */ |
3c918704 | 2567 | sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2568 | if (sat) |
2569 | sat /= sizeof(__u16); | |
2570 | ||
2571 | for (i = 0; i < sat; ++i) { | |
2572 | switch (param.sat->types[i]) { | |
2573 | case SCTP_PARAM_IPV4_ADDRESS: | |
2574 | asoc->peer.ipv4_address = 1; | |
2575 | break; | |
2576 | ||
2577 | case SCTP_PARAM_IPV6_ADDRESS: | |
6e40a915 WY |
2578 | if (PF_INET6 == asoc->base.sk->sk_family) |
2579 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
2580 | break; |
2581 | ||
2582 | case SCTP_PARAM_HOST_NAME_ADDRESS: | |
2583 | asoc->peer.hostname_address = 1; | |
2584 | break; | |
2585 | ||
2586 | default: /* Just ignore anything else. */ | |
2587 | break; | |
3ff50b79 | 2588 | } |
1da177e4 LT |
2589 | } |
2590 | break; | |
2591 | ||
2592 | case SCTP_PARAM_STATE_COOKIE: | |
2593 | asoc->peer.cookie_len = | |
3c918704 | 2594 | ntohs(param.p->length) - sizeof(struct sctp_paramhdr); |
1da177e4 LT |
2595 | asoc->peer.cookie = param.cookie->body; |
2596 | break; | |
2597 | ||
2598 | case SCTP_PARAM_HEARTBEAT_INFO: | |
2599 | /* Would be odd to receive, but it causes no problems. */ | |
2600 | break; | |
2601 | ||
2602 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: | |
2603 | /* Rejected during verify stage. */ | |
2604 | break; | |
2605 | ||
2606 | case SCTP_PARAM_ECN_CAPABLE: | |
2607 | asoc->peer.ecn_capable = 1; | |
2608 | break; | |
2609 | ||
0f3fffd8 | 2610 | case SCTP_PARAM_ADAPTATION_LAYER_IND: |
e69c4e0f | 2611 | asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); |
1da177e4 LT |
2612 | break; |
2613 | ||
d6de3097 | 2614 | case SCTP_PARAM_SET_PRIMARY: |
e1fc3b14 | 2615 | if (!net->sctp.addip_enable) |
0ef46e28 VY |
2616 | goto fall_through; |
2617 | ||
8b32f234 | 2618 | addr_param = param.v + sizeof(struct sctp_addip_param); |
d6de3097 | 2619 | |
cfbf654e | 2620 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
e40607cb DB |
2621 | if (af == NULL) |
2622 | break; | |
2623 | ||
d6de3097 VY |
2624 | af->from_addr_param(&addr, addr_param, |
2625 | htons(asoc->peer.port), 0); | |
2626 | ||
2627 | /* if the address is invalid, we can't process it. | |
2628 | * XXX: see spec for what to do. | |
2629 | */ | |
2630 | if (!af->addr_valid(&addr, NULL, NULL)) | |
2631 | break; | |
2632 | ||
2633 | t = sctp_assoc_lookup_paddr(asoc, &addr); | |
2634 | if (!t) | |
2635 | break; | |
2636 | ||
2637 | sctp_assoc_set_primary(asoc, t); | |
2638 | break; | |
2639 | ||
131a47e3 VY |
2640 | case SCTP_PARAM_SUPPORTED_EXT: |
2641 | sctp_process_ext_param(asoc, param); | |
2642 | break; | |
2643 | ||
1da177e4 | 2644 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
28aa4c26 | 2645 | if (asoc->prsctp_enable) { |
1da177e4 LT |
2646 | asoc->peer.prsctp_capable = 1; |
2647 | break; | |
2648 | } | |
d808ad9a | 2649 | /* Fall Through */ |
730fc3d0 VY |
2650 | goto fall_through; |
2651 | ||
2652 | case SCTP_PARAM_RANDOM: | |
b14878cc | 2653 | if (!ep->auth_enable) |
730fc3d0 VY |
2654 | goto fall_through; |
2655 | ||
2656 | /* Save peer's random parameter */ | |
2657 | asoc->peer.peer_random = kmemdup(param.p, | |
2658 | ntohs(param.p->length), gfp); | |
2659 | if (!asoc->peer.peer_random) { | |
2660 | retval = 0; | |
2661 | break; | |
2662 | } | |
2663 | break; | |
2664 | ||
2665 | case SCTP_PARAM_HMAC_ALGO: | |
b14878cc | 2666 | if (!ep->auth_enable) |
730fc3d0 VY |
2667 | goto fall_through; |
2668 | ||
2669 | /* Save peer's HMAC list */ | |
2670 | asoc->peer.peer_hmacs = kmemdup(param.p, | |
2671 | ntohs(param.p->length), gfp); | |
2672 | if (!asoc->peer.peer_hmacs) { | |
2673 | retval = 0; | |
2674 | break; | |
2675 | } | |
2676 | ||
2677 | /* Set the default HMAC the peer requested*/ | |
2678 | sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); | |
2679 | break; | |
2680 | ||
2681 | case SCTP_PARAM_CHUNKS: | |
b14878cc | 2682 | if (!ep->auth_enable) |
730fc3d0 VY |
2683 | goto fall_through; |
2684 | ||
2685 | asoc->peer.peer_chunks = kmemdup(param.p, | |
2686 | ntohs(param.p->length), gfp); | |
2687 | if (!asoc->peer.peer_chunks) | |
2688 | retval = 0; | |
2689 | break; | |
2690 | fall_through: | |
1da177e4 LT |
2691 | default: |
2692 | /* Any unrecognized parameters should have been caught | |
2693 | * and handled by sctp_verify_param() which should be | |
2694 | * called prior to this routine. Simply log the error | |
2695 | * here. | |
2696 | */ | |
bb33381d DB |
2697 | pr_debug("%s: ignoring param:%d for association:%p.\n", |
2698 | __func__, ntohs(param.p->type), asoc); | |
1da177e4 | 2699 | break; |
3ff50b79 | 2700 | } |
1da177e4 LT |
2701 | |
2702 | return retval; | |
2703 | } | |
2704 | ||
2705 | /* Select a new verification tag. */ | |
2706 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) | |
2707 | { | |
2708 | /* I believe that this random number generator complies with RFC1750. | |
2709 | * A tag of 0 is reserved for special cases (e.g. INIT). | |
2710 | */ | |
2711 | __u32 x; | |
2712 | ||
2713 | do { | |
2714 | get_random_bytes(&x, sizeof(__u32)); | |
2715 | } while (x == 0); | |
2716 | ||
2717 | return x; | |
2718 | } | |
2719 | ||
2720 | /* Select an initial TSN to send during startup. */ | |
2721 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) | |
2722 | { | |
2723 | __u32 retval; | |
2724 | ||
2725 | get_random_bytes(&retval, sizeof(__u32)); | |
2726 | return retval; | |
2727 | } | |
2728 | ||
2729 | /* | |
2730 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) | |
2731 | * 0 1 2 3 | |
2732 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2733 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2734 | * | Type = 0xC1 | Chunk Flags | Chunk Length | | |
2735 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2736 | * | Serial Number | | |
2737 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2738 | * | Address Parameter | | |
2739 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2740 | * | ASCONF Parameter #1 | | |
2741 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2742 | * \ \ | |
2743 | * / .... / | |
2744 | * \ \ | |
2745 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2746 | * | ASCONF Parameter #N | | |
2747 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2748 | * | |
d808ad9a | 2749 | * Address Parameter and other parameter will not be wrapped in this function |
1da177e4 LT |
2750 | */ |
2751 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, | |
2752 | union sctp_addr *addr, | |
2753 | int vparam_len) | |
2754 | { | |
65205cc4 | 2755 | struct sctp_addiphdr asconf; |
1da177e4 LT |
2756 | struct sctp_chunk *retval; |
2757 | int length = sizeof(asconf) + vparam_len; | |
2758 | union sctp_addr_param addrparam; | |
2759 | int addrlen; | |
2760 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); | |
2761 | ||
2762 | addrlen = af->to_addr_param(addr, &addrparam); | |
2763 | if (!addrlen) | |
2764 | return NULL; | |
2765 | length += addrlen; | |
2766 | ||
2767 | /* Create the chunk. */ | |
cea8768f MRL |
2768 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, |
2769 | GFP_ATOMIC); | |
1da177e4 LT |
2770 | if (!retval) |
2771 | return NULL; | |
2772 | ||
2773 | asconf.serial = htonl(asoc->addip_serial++); | |
2774 | ||
2775 | retval->subh.addip_hdr = | |
2776 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2777 | retval->param_hdr.v = | |
2778 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2779 | ||
2780 | return retval; | |
2781 | } | |
2782 | ||
2783 | /* ADDIP | |
2784 | * 3.2.1 Add IP Address | |
2785 | * 0 1 2 3 | |
2786 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2788 | * | Type = 0xC001 | Length = Variable | | |
2789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2790 | * | ASCONF-Request Correlation ID | | |
2791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2792 | * | Address Parameter | | |
2793 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2794 | * | |
2795 | * 3.2.2 Delete IP Address | |
2796 | * 0 1 2 3 | |
2797 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2798 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2799 | * | Type = 0xC002 | Length = Variable | | |
2800 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2801 | * | ASCONF-Request Correlation ID | | |
2802 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2803 | * | Address Parameter | | |
2804 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2805 | * | |
2806 | */ | |
2807 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, | |
327c0dab XL |
2808 | union sctp_addr *laddr, |
2809 | struct sockaddr *addrs, | |
2810 | int addrcnt, __be16 flags) | |
1da177e4 | 2811 | { |
327c0dab | 2812 | union sctp_addr_param addr_param; |
8b32f234 | 2813 | struct sctp_addip_param param; |
327c0dab XL |
2814 | int paramlen = sizeof(param); |
2815 | struct sctp_chunk *retval; | |
2816 | int addr_param_len = 0; | |
2817 | union sctp_addr *addr; | |
2818 | int totallen = 0, i; | |
2819 | int del_pickup = 0; | |
2820 | struct sctp_af *af; | |
2821 | void *addr_buf; | |
1da177e4 LT |
2822 | |
2823 | /* Get total length of all the address parameters. */ | |
2824 | addr_buf = addrs; | |
2825 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2826 | addr = addr_buf; |
1da177e4 LT |
2827 | af = sctp_get_af_specific(addr->v4.sin_family); |
2828 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2829 | ||
2830 | totallen += paramlen; | |
2831 | totallen += addr_param_len; | |
2832 | ||
2833 | addr_buf += af->sockaddr_len; | |
8a07eb0a MH |
2834 | if (asoc->asconf_addr_del_pending && !del_pickup) { |
2835 | /* reuse the parameter length from the same scope one */ | |
2836 | totallen += paramlen; | |
2837 | totallen += addr_param_len; | |
2838 | del_pickup = 1; | |
bb33381d DB |
2839 | |
2840 | pr_debug("%s: picked same-scope del_pending addr, " | |
2841 | "totallen for all addresses is %d\n", | |
2842 | __func__, totallen); | |
8a07eb0a | 2843 | } |
1da177e4 LT |
2844 | } |
2845 | ||
2846 | /* Create an asconf chunk with the required length. */ | |
2847 | retval = sctp_make_asconf(asoc, laddr, totallen); | |
2848 | if (!retval) | |
2849 | return NULL; | |
2850 | ||
2851 | /* Add the address parameters to the asconf chunk. */ | |
2852 | addr_buf = addrs; | |
2853 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 2854 | addr = addr_buf; |
1da177e4 LT |
2855 | af = sctp_get_af_specific(addr->v4.sin_family); |
2856 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2857 | param.param_hdr.type = flags; | |
2858 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2859 | param.crr_id = htonl(i); |
1da177e4 LT |
2860 | |
2861 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2862 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2863 | ||
2864 | addr_buf += af->sockaddr_len; | |
2865 | } | |
8a07eb0a MH |
2866 | if (flags == SCTP_PARAM_ADD_IP && del_pickup) { |
2867 | addr = asoc->asconf_addr_del_pending; | |
2868 | af = sctp_get_af_specific(addr->v4.sin_family); | |
2869 | addr_param_len = af->to_addr_param(addr, &addr_param); | |
2870 | param.param_hdr.type = SCTP_PARAM_DEL_IP; | |
2871 | param.param_hdr.length = htons(paramlen + addr_param_len); | |
978aa047 | 2872 | param.crr_id = htonl(i); |
8a07eb0a MH |
2873 | |
2874 | sctp_addto_chunk(retval, paramlen, ¶m); | |
2875 | sctp_addto_chunk(retval, addr_param_len, &addr_param); | |
2876 | } | |
1da177e4 LT |
2877 | return retval; |
2878 | } | |
2879 | ||
2880 | /* ADDIP | |
2881 | * 3.2.4 Set Primary IP Address | |
2882 | * 0 1 2 3 | |
2883 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2884 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2885 | * | Type =0xC004 | Length = Variable | | |
2886 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2887 | * | ASCONF-Request Correlation ID | | |
2888 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2889 | * | Address Parameter | | |
2890 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2891 | * | |
d808ad9a | 2892 | * Create an ASCONF chunk with Set Primary IP address parameter. |
1da177e4 LT |
2893 | */ |
2894 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, | |
2895 | union sctp_addr *addr) | |
2896 | { | |
327c0dab XL |
2897 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2898 | union sctp_addr_param addrparam; | |
8b32f234 | 2899 | struct sctp_addip_param param; |
327c0dab XL |
2900 | struct sctp_chunk *retval; |
2901 | int len = sizeof(param); | |
2902 | int addrlen; | |
1da177e4 LT |
2903 | |
2904 | addrlen = af->to_addr_param(addr, &addrparam); | |
2905 | if (!addrlen) | |
2906 | return NULL; | |
2907 | len += addrlen; | |
2908 | ||
2909 | /* Create the chunk and make asconf header. */ | |
2910 | retval = sctp_make_asconf(asoc, addr, len); | |
2911 | if (!retval) | |
2912 | return NULL; | |
2913 | ||
2914 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; | |
2915 | param.param_hdr.length = htons(len); | |
2916 | param.crr_id = 0; | |
2917 | ||
2918 | sctp_addto_chunk(retval, sizeof(param), ¶m); | |
2919 | sctp_addto_chunk(retval, addrlen, &addrparam); | |
2920 | ||
2921 | return retval; | |
2922 | } | |
2923 | ||
2924 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) | |
2925 | * 0 1 2 3 | |
2926 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
2927 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2928 | * | Type = 0x80 | Chunk Flags | Chunk Length | | |
2929 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2930 | * | Serial Number | | |
2931 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2932 | * | ASCONF Parameter Response#1 | | |
2933 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2934 | * \ \ | |
2935 | * / .... / | |
2936 | * \ \ | |
2937 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2938 | * | ASCONF Parameter Response#N | | |
2939 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2940 | * | |
d808ad9a | 2941 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
1da177e4 LT |
2942 | */ |
2943 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, | |
2944 | __u32 serial, int vparam_len) | |
2945 | { | |
327c0dab XL |
2946 | struct sctp_addiphdr asconf; |
2947 | struct sctp_chunk *retval; | |
2948 | int length = sizeof(asconf) + vparam_len; | |
1da177e4 LT |
2949 | |
2950 | /* Create the chunk. */ | |
cea8768f MRL |
2951 | retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, |
2952 | GFP_ATOMIC); | |
1da177e4 LT |
2953 | if (!retval) |
2954 | return NULL; | |
2955 | ||
2956 | asconf.serial = htonl(serial); | |
2957 | ||
2958 | retval->subh.addip_hdr = | |
2959 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); | |
2960 | ||
2961 | return retval; | |
2962 | } | |
2963 | ||
2964 | /* Add response parameters to an ASCONF_ACK chunk. */ | |
9f81bcd9 | 2965 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, |
8b32f234 XL |
2966 | __be16 err_code, |
2967 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 2968 | { |
8b32f234 | 2969 | struct sctp_addip_param ack_param; |
327c0dab XL |
2970 | struct sctp_errhdr err_param; |
2971 | int asconf_param_len = 0; | |
2972 | int err_param_len = 0; | |
2973 | __be16 response_type; | |
1da177e4 LT |
2974 | |
2975 | if (SCTP_ERROR_NO_ERROR == err_code) { | |
2976 | response_type = SCTP_PARAM_SUCCESS_REPORT; | |
2977 | } else { | |
2978 | response_type = SCTP_PARAM_ERR_CAUSE; | |
2979 | err_param_len = sizeof(err_param); | |
2980 | if (asconf_param) | |
2981 | asconf_param_len = | |
2982 | ntohs(asconf_param->param_hdr.length); | |
2983 | } | |
2984 | ||
d808ad9a | 2985 | /* Add Success Indication or Error Cause Indication parameter. */ |
1da177e4 LT |
2986 | ack_param.param_hdr.type = response_type; |
2987 | ack_param.param_hdr.length = htons(sizeof(ack_param) + | |
2988 | err_param_len + | |
2989 | asconf_param_len); | |
2990 | ack_param.crr_id = crr_id; | |
2991 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); | |
2992 | ||
2993 | if (SCTP_ERROR_NO_ERROR == err_code) | |
2994 | return; | |
2995 | ||
2996 | /* Add Error Cause parameter. */ | |
2997 | err_param.cause = err_code; | |
2998 | err_param.length = htons(err_param_len + asconf_param_len); | |
2999 | sctp_addto_chunk(chunk, err_param_len, &err_param); | |
3000 | ||
3001 | /* Add the failed TLV copied from ASCONF chunk. */ | |
3002 | if (asconf_param) | |
3003 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); | |
3004 | } | |
3005 | ||
3006 | /* Process a asconf parameter. */ | |
dbc16db1 | 3007 | static __be16 sctp_process_asconf_param(struct sctp_association *asoc, |
8b32f234 XL |
3008 | struct sctp_chunk *asconf, |
3009 | struct sctp_addip_param *asconf_param) | |
1da177e4 | 3010 | { |
327c0dab | 3011 | union sctp_addr_param *addr_param; |
1da177e4 | 3012 | struct sctp_transport *peer; |
1da177e4 | 3013 | union sctp_addr addr; |
327c0dab | 3014 | struct sctp_af *af; |
5f242a13 | 3015 | |
8b32f234 | 3016 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
c1cc678a | 3017 | |
44e65c1e WY |
3018 | if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && |
3019 | asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && | |
3020 | asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) | |
3021 | return SCTP_ERROR_UNKNOWN_PARAM; | |
3022 | ||
6a435732 | 3023 | switch (addr_param->p.type) { |
c4492586 WY |
3024 | case SCTP_PARAM_IPV6_ADDRESS: |
3025 | if (!asoc->peer.ipv6_address) | |
945e5abc | 3026 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3027 | break; |
3028 | case SCTP_PARAM_IPV4_ADDRESS: | |
3029 | if (!asoc->peer.ipv4_address) | |
945e5abc | 3030 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3031 | break; |
3032 | default: | |
945e5abc | 3033 | return SCTP_ERROR_DNS_FAILED; |
c4492586 WY |
3034 | } |
3035 | ||
6a435732 | 3036 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
1da177e4 | 3037 | if (unlikely(!af)) |
945e5abc | 3038 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 | 3039 | |
dd86d136 | 3040 | af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); |
42e30bf3 VY |
3041 | |
3042 | /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast | |
3043 | * or multicast address. | |
3044 | * (note: wildcard is permitted and requires special handling so | |
3045 | * make sure we check for that) | |
3046 | */ | |
3047 | if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) | |
945e5abc | 3048 | return SCTP_ERROR_DNS_FAILED; |
42e30bf3 | 3049 | |
1da177e4 LT |
3050 | switch (asconf_param->param_hdr.type) { |
3051 | case SCTP_PARAM_ADD_IP: | |
42e30bf3 VY |
3052 | /* Section 4.2.1: |
3053 | * If the address 0.0.0.0 or ::0 is provided, the source | |
3054 | * address of the packet MUST be added. | |
3055 | */ | |
3056 | if (af->is_any(&addr)) | |
3057 | memcpy(&addr, &asconf->source, sizeof(addr)); | |
3058 | ||
2277c7cd RH |
3059 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3060 | SCTP_PARAM_ADD_IP, | |
3061 | (struct sockaddr *)&addr, | |
3062 | af->sockaddr_len)) | |
3063 | return SCTP_ERROR_REQ_REFUSED; | |
3064 | ||
1da177e4 | 3065 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
d808ad9a YH |
3066 | * request and does not have the local resources to add this |
3067 | * new address to the association, it MUST return an Error | |
3068 | * Cause TLV set to the new error code 'Operation Refused | |
3069 | * Due to Resource Shortage'. | |
3070 | */ | |
1da177e4 | 3071 | |
dd86d136 | 3072 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); |
1da177e4 LT |
3073 | if (!peer) |
3074 | return SCTP_ERROR_RSRC_LOW; | |
3075 | ||
3076 | /* Start the heartbeat timer. */ | |
ba6f5e33 | 3077 | sctp_transport_reset_hb_timer(peer); |
6af29ccc | 3078 | asoc->new_transport = peer; |
1da177e4 LT |
3079 | break; |
3080 | case SCTP_PARAM_DEL_IP: | |
3081 | /* ADDIP 4.3 D7) If a request is received to delete the | |
d808ad9a YH |
3082 | * last remaining IP address of a peer endpoint, the receiver |
3083 | * MUST send an Error Cause TLV with the error cause set to the | |
3084 | * new error code 'Request to Delete Last Remaining IP Address'. | |
3085 | */ | |
42e30bf3 | 3086 | if (asoc->peer.transport_count == 1) |
1da177e4 LT |
3087 | return SCTP_ERROR_DEL_LAST_IP; |
3088 | ||
3089 | /* ADDIP 4.3 D8) If a request is received to delete an IP | |
3090 | * address which is also the source address of the IP packet | |
3091 | * which contained the ASCONF chunk, the receiver MUST reject | |
3092 | * this request. To reject the request the receiver MUST send | |
3093 | * an Error Cause TLV set to the new error code 'Request to | |
3094 | * Delete Source IP Address' | |
3095 | */ | |
b1364104 | 3096 | if (sctp_cmp_addr_exact(&asconf->source, &addr)) |
1da177e4 LT |
3097 | return SCTP_ERROR_DEL_SRC_IP; |
3098 | ||
42e30bf3 VY |
3099 | /* Section 4.2.2 |
3100 | * If the address 0.0.0.0 or ::0 is provided, all | |
3101 | * addresses of the peer except the source address of the | |
3102 | * packet MUST be deleted. | |
3103 | */ | |
3104 | if (af->is_any(&addr)) { | |
3105 | sctp_assoc_set_primary(asoc, asconf->transport); | |
3106 | sctp_assoc_del_nonprimary_peers(asoc, | |
3107 | asconf->transport); | |
7c5a9461 | 3108 | return SCTP_ERROR_NO_ERROR; |
3109 | } | |
3110 | ||
3111 | /* If the address is not part of the association, the | |
3112 | * ASCONF-ACK with Error Cause Indication Parameter | |
3113 | * which including cause of Unresolvable Address should | |
3114 | * be sent. | |
3115 | */ | |
3116 | peer = sctp_assoc_lookup_paddr(asoc, &addr); | |
3117 | if (!peer) | |
3118 | return SCTP_ERROR_DNS_FAILED; | |
3119 | ||
3120 | sctp_assoc_rm_peer(asoc, peer); | |
1da177e4 LT |
3121 | break; |
3122 | case SCTP_PARAM_SET_PRIMARY: | |
42e30bf3 VY |
3123 | /* ADDIP Section 4.2.4 |
3124 | * If the address 0.0.0.0 or ::0 is provided, the receiver | |
3125 | * MAY mark the source address of the packet as its | |
3126 | * primary. | |
3127 | */ | |
3128 | if (af->is_any(&addr)) | |
3129 | memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); | |
3130 | ||
2277c7cd RH |
3131 | if (security_sctp_bind_connect(asoc->ep->base.sk, |
3132 | SCTP_PARAM_SET_PRIMARY, | |
3133 | (struct sockaddr *)&addr, | |
3134 | af->sockaddr_len)) | |
3135 | return SCTP_ERROR_REQ_REFUSED; | |
3136 | ||
dd86d136 | 3137 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
1da177e4 | 3138 | if (!peer) |
945e5abc | 3139 | return SCTP_ERROR_DNS_FAILED; |
1da177e4 LT |
3140 | |
3141 | sctp_assoc_set_primary(asoc, peer); | |
3142 | break; | |
1da177e4 LT |
3143 | } |
3144 | ||
3145 | return SCTP_ERROR_NO_ERROR; | |
3146 | } | |
3147 | ||
9de7922b DB |
3148 | /* Verify the ASCONF packet before we process it. */ |
3149 | bool sctp_verify_asconf(const struct sctp_association *asoc, | |
3150 | struct sctp_chunk *chunk, bool addr_param_needed, | |
3151 | struct sctp_paramhdr **errp) | |
3152 | { | |
68d75469 | 3153 | struct sctp_addip_chunk *addip; |
9de7922b | 3154 | bool addr_param_seen = false; |
327c0dab | 3155 | union sctp_params param; |
6f4c618d | 3156 | |
68d75469 | 3157 | addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; |
9de7922b DB |
3158 | sctp_walk_params(param, addip, addip_hdr.params) { |
3159 | size_t length = ntohs(param.p->length); | |
6f4c618d | 3160 | |
9de7922b | 3161 | *errp = param.p; |
6f4c618d | 3162 | switch (param.p->type) { |
9de7922b DB |
3163 | case SCTP_PARAM_ERR_CAUSE: |
3164 | break; | |
3165 | case SCTP_PARAM_IPV4_ADDRESS: | |
a38905e6 | 3166 | if (length != sizeof(struct sctp_ipv4addr_param)) |
9de7922b | 3167 | return false; |
ce7b4ccc | 3168 | /* ensure there is only one addr param and it's in the |
3169 | * beginning of addip_hdr params, or we reject it. | |
3170 | */ | |
3171 | if (param.v != addip->addip_hdr.params) | |
3172 | return false; | |
9de7922b DB |
3173 | addr_param_seen = true; |
3174 | break; | |
3175 | case SCTP_PARAM_IPV6_ADDRESS: | |
00987cc0 | 3176 | if (length != sizeof(struct sctp_ipv6addr_param)) |
9de7922b | 3177 | return false; |
ce7b4ccc | 3178 | if (param.v != addip->addip_hdr.params) |
3179 | return false; | |
9de7922b DB |
3180 | addr_param_seen = true; |
3181 | break; | |
6f4c618d WY |
3182 | case SCTP_PARAM_ADD_IP: |
3183 | case SCTP_PARAM_DEL_IP: | |
3184 | case SCTP_PARAM_SET_PRIMARY: | |
9de7922b DB |
3185 | /* In ASCONF chunks, these need to be first. */ |
3186 | if (addr_param_needed && !addr_param_seen) | |
3187 | return false; | |
3188 | length = ntohs(param.addip->param_hdr.length); | |
8b32f234 | 3189 | if (length < sizeof(struct sctp_addip_param) + |
3c918704 | 3190 | sizeof(**errp)) |
9de7922b | 3191 | return false; |
6f4c618d WY |
3192 | break; |
3193 | case SCTP_PARAM_SUCCESS_REPORT: | |
3194 | case SCTP_PARAM_ADAPTATION_LAYER_IND: | |
8b32f234 | 3195 | if (length != sizeof(struct sctp_addip_param)) |
9de7922b | 3196 | return false; |
6f4c618d WY |
3197 | break; |
3198 | default: | |
9de7922b DB |
3199 | /* This is unkown to us, reject! */ |
3200 | return false; | |
6f4c618d | 3201 | } |
6f4c618d WY |
3202 | } |
3203 | ||
9de7922b DB |
3204 | /* Remaining sanity checks. */ |
3205 | if (addr_param_needed && !addr_param_seen) | |
3206 | return false; | |
3207 | if (!addr_param_needed && addr_param_seen) | |
3208 | return false; | |
3209 | if (param.v != chunk->chunk_end) | |
3210 | return false; | |
6f4c618d | 3211 | |
9de7922b | 3212 | return true; |
6f4c618d WY |
3213 | } |
3214 | ||
d808ad9a | 3215 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
1da177e4 LT |
3216 | * return an ASCONF_ACK chunk to be sent in response. |
3217 | */ | |
3218 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, | |
3219 | struct sctp_chunk *asconf) | |
3220 | { | |
327c0dab | 3221 | union sctp_addr_param *addr_param; |
68d75469 | 3222 | struct sctp_addip_chunk *addip; |
327c0dab | 3223 | struct sctp_chunk *asconf_ack; |
9de7922b | 3224 | bool all_param_pass = true; |
327c0dab XL |
3225 | struct sctp_addiphdr *hdr; |
3226 | int length = 0, chunk_len; | |
9de7922b | 3227 | union sctp_params param; |
327c0dab XL |
3228 | __be16 err_code; |
3229 | __u32 serial; | |
1da177e4 | 3230 | |
68d75469 | 3231 | addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; |
922dbc5b XL |
3232 | chunk_len = ntohs(asconf->chunk_hdr->length) - |
3233 | sizeof(struct sctp_chunkhdr); | |
65205cc4 | 3234 | hdr = (struct sctp_addiphdr *)asconf->skb->data; |
1da177e4 LT |
3235 | serial = ntohl(hdr->serial); |
3236 | ||
d808ad9a | 3237 | /* Skip the addiphdr and store a pointer to address parameter. */ |
65205cc4 | 3238 | length = sizeof(*hdr); |
1da177e4 LT |
3239 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3240 | chunk_len -= length; | |
3241 | ||
3242 | /* Skip the address parameter and store a pointer to the first | |
7aa1b54b | 3243 | * asconf parameter. |
d808ad9a | 3244 | */ |
6a435732 | 3245 | length = ntohs(addr_param->p.length); |
1da177e4 LT |
3246 | chunk_len -= length; |
3247 | ||
d808ad9a | 3248 | /* create an ASCONF_ACK chunk. |
1da177e4 | 3249 | * Based on the definitions of parameters, we know that the size of |
2cab86be | 3250 | * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF |
7aa1b54b | 3251 | * parameters. |
1da177e4 | 3252 | */ |
2cab86be | 3253 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); |
1da177e4 LT |
3254 | if (!asconf_ack) |
3255 | goto done; | |
3256 | ||
3257 | /* Process the TLVs contained within the ASCONF chunk. */ | |
9de7922b DB |
3258 | sctp_walk_params(param, addip, addip_hdr.params) { |
3259 | /* Skip preceeding address parameters. */ | |
3260 | if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || | |
3261 | param.p->type == SCTP_PARAM_IPV6_ADDRESS) | |
3262 | continue; | |
3263 | ||
1da177e4 | 3264 | err_code = sctp_process_asconf_param(asoc, asconf, |
9de7922b | 3265 | param.addip); |
1da177e4 LT |
3266 | /* ADDIP 4.1 A7) |
3267 | * If an error response is received for a TLV parameter, | |
3268 | * all TLVs with no response before the failed TLV are | |
3269 | * considered successful if not reported. All TLVs after | |
3270 | * the failed response are considered unsuccessful unless | |
3271 | * a specific success indication is present for the parameter. | |
3272 | */ | |
9de7922b DB |
3273 | if (err_code != SCTP_ERROR_NO_ERROR) |
3274 | all_param_pass = false; | |
1da177e4 | 3275 | if (!all_param_pass) |
9de7922b DB |
3276 | sctp_add_asconf_response(asconf_ack, param.addip->crr_id, |
3277 | err_code, param.addip); | |
1da177e4 LT |
3278 | |
3279 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add | |
3280 | * an IP address sends an 'Out of Resource' in its response, it | |
3281 | * MUST also fail any subsequent add or delete requests bundled | |
d808ad9a | 3282 | * in the ASCONF. |
1da177e4 | 3283 | */ |
9de7922b | 3284 | if (err_code == SCTP_ERROR_RSRC_LOW) |
1da177e4 | 3285 | goto done; |
1da177e4 | 3286 | } |
1da177e4 LT |
3287 | done: |
3288 | asoc->peer.addip_serial++; | |
3289 | ||
3290 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc | |
d808ad9a | 3291 | * after freeing the reference to old asconf ack if any. |
1da177e4 LT |
3292 | */ |
3293 | if (asconf_ack) { | |
1da177e4 | 3294 | sctp_chunk_hold(asconf_ack); |
a08de64d VY |
3295 | list_add_tail(&asconf_ack->transmitted_list, |
3296 | &asoc->asconf_ack_list); | |
1da177e4 LT |
3297 | } |
3298 | ||
3299 | return asconf_ack; | |
3300 | } | |
3301 | ||
3302 | /* Process a asconf parameter that is successfully acked. */ | |
425e0f68 | 3303 | static void sctp_asconf_param_success(struct sctp_association *asoc, |
8b32f234 | 3304 | struct sctp_addip_param *asconf_param) |
1da177e4 | 3305 | { |
1da177e4 LT |
3306 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
3307 | union sctp_addr_param *addr_param; | |
dc022a98 | 3308 | struct sctp_sockaddr_entry *saddr; |
327c0dab XL |
3309 | struct sctp_transport *transport; |
3310 | union sctp_addr addr; | |
3311 | struct sctp_af *af; | |
1da177e4 | 3312 | |
8b32f234 | 3313 | addr_param = (void *)asconf_param + sizeof(*asconf_param); |
1da177e4 LT |
3314 | |
3315 | /* We have checked the packet before, so we do not check again. */ | |
6a435732 | 3316 | af = sctp_get_af_specific(param_type2af(addr_param->p.type)); |
dd86d136 | 3317 | af->from_addr_param(&addr, addr_param, htons(bp->port), 0); |
1da177e4 LT |
3318 | |
3319 | switch (asconf_param->param_hdr.type) { | |
3320 | case SCTP_PARAM_ADD_IP: | |
559cf710 VY |
3321 | /* This is always done in BH context with a socket lock |
3322 | * held, so the list can not change. | |
3323 | */ | |
0ed90fb0 | 3324 | local_bh_disable(); |
559cf710 | 3325 | list_for_each_entry(saddr, &bp->address_list, list) { |
dd86d136 | 3326 | if (sctp_cmp_addr_exact(&saddr->a, &addr)) |
f57d96b2 | 3327 | saddr->state = SCTP_ADDR_SRC; |
dc022a98 | 3328 | } |
0ed90fb0 | 3329 | local_bh_enable(); |
3cd9749c WY |
3330 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3331 | transports) { | |
c86a773c | 3332 | sctp_transport_dst_release(transport); |
3cd9749c | 3333 | } |
1da177e4 LT |
3334 | break; |
3335 | case SCTP_PARAM_DEL_IP: | |
0ed90fb0 | 3336 | local_bh_disable(); |
425e0f68 | 3337 | sctp_del_bind_addr(bp, &addr); |
8a07eb0a MH |
3338 | if (asoc->asconf_addr_del_pending != NULL && |
3339 | sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { | |
3340 | kfree(asoc->asconf_addr_del_pending); | |
3341 | asoc->asconf_addr_del_pending = NULL; | |
3342 | } | |
0ed90fb0 | 3343 | local_bh_enable(); |
9dbc15f0 RD |
3344 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
3345 | transports) { | |
c86a773c | 3346 | sctp_transport_dst_release(transport); |
1da177e4 LT |
3347 | } |
3348 | break; | |
3349 | default: | |
3350 | break; | |
3351 | } | |
1da177e4 LT |
3352 | } |
3353 | ||
3354 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk | |
3355 | * for the given asconf parameter. If there is no response for this parameter, | |
d808ad9a | 3356 | * return the error code based on the third argument 'no_err'. |
1da177e4 LT |
3357 | * ADDIP 4.1 |
3358 | * A7) If an error response is received for a TLV parameter, all TLVs with no | |
3359 | * response before the failed TLV are considered successful if not reported. | |
3360 | * All TLVs after the failed response are considered unsuccessful unless a | |
3361 | * specific success indication is present for the parameter. | |
3362 | */ | |
dbc16db1 | 3363 | static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
8b32f234 XL |
3364 | struct sctp_addip_param *asconf_param, |
3365 | int no_err) | |
1da177e4 | 3366 | { |
8b32f234 | 3367 | struct sctp_addip_param *asconf_ack_param; |
327c0dab XL |
3368 | struct sctp_errhdr *err_param; |
3369 | int asconf_ack_len; | |
3370 | __be16 err_code; | |
3371 | int length; | |
1da177e4 LT |
3372 | |
3373 | if (no_err) | |
3374 | err_code = SCTP_ERROR_NO_ERROR; | |
3375 | else | |
3376 | err_code = SCTP_ERROR_REQ_REFUSED; | |
3377 | ||
f3830ccc | 3378 | asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - |
922dbc5b | 3379 | sizeof(struct sctp_chunkhdr); |
f3830ccc | 3380 | |
1da177e4 LT |
3381 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
3382 | * the first asconf_ack parameter. | |
d808ad9a | 3383 | */ |
65205cc4 | 3384 | length = sizeof(struct sctp_addiphdr); |
8b32f234 XL |
3385 | asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + |
3386 | length); | |
1da177e4 LT |
3387 | asconf_ack_len -= length; |
3388 | ||
3389 | while (asconf_ack_len > 0) { | |
3390 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { | |
cb3f837b | 3391 | switch (asconf_ack_param->param_hdr.type) { |
1da177e4 LT |
3392 | case SCTP_PARAM_SUCCESS_REPORT: |
3393 | return SCTP_ERROR_NO_ERROR; | |
3394 | case SCTP_PARAM_ERR_CAUSE: | |
8b32f234 | 3395 | length = sizeof(*asconf_ack_param); |
ea110733 | 3396 | err_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3397 | asconf_ack_len -= length; |
3398 | if (asconf_ack_len > 0) | |
3399 | return err_param->cause; | |
3400 | else | |
3401 | return SCTP_ERROR_INV_PARAM; | |
3402 | break; | |
3403 | default: | |
3404 | return SCTP_ERROR_INV_PARAM; | |
3405 | } | |
3406 | } | |
3407 | ||
3408 | length = ntohs(asconf_ack_param->param_hdr.length); | |
ea110733 | 3409 | asconf_ack_param = (void *)asconf_ack_param + length; |
1da177e4 LT |
3410 | asconf_ack_len -= length; |
3411 | } | |
3412 | ||
3413 | return err_code; | |
3414 | } | |
3415 | ||
3416 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ | |
3417 | int sctp_process_asconf_ack(struct sctp_association *asoc, | |
3418 | struct sctp_chunk *asconf_ack) | |
3419 | { | |
327c0dab XL |
3420 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
3421 | struct sctp_addip_param *asconf_param; | |
3422 | __be16 err_code = SCTP_ERROR_NO_ERROR; | |
3423 | union sctp_addr_param *addr_param; | |
3424 | int asconf_len = asconf->skb->len; | |
3425 | int all_param_pass = 0; | |
3426 | int length = 0; | |
3427 | int no_err = 1; | |
3428 | int retval = 0; | |
1da177e4 LT |
3429 | |
3430 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store | |
3431 | * a pointer to address parameter. | |
d808ad9a | 3432 | */ |
68d75469 | 3433 | length = sizeof(struct sctp_addip_chunk); |
1da177e4 LT |
3434 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
3435 | asconf_len -= length; | |
3436 | ||
3437 | /* Skip the address parameter in the last asconf sent and store a | |
7aa1b54b | 3438 | * pointer to the first asconf parameter. |
d808ad9a | 3439 | */ |
6a435732 | 3440 | length = ntohs(addr_param->p.length); |
ea110733 | 3441 | asconf_param = (void *)addr_param + length; |
1da177e4 LT |
3442 | asconf_len -= length; |
3443 | ||
3444 | /* ADDIP 4.1 | |
3445 | * A8) If there is no response(s) to specific TLV parameter(s), and no | |
3446 | * failures are indicated, then all request(s) are considered | |
3447 | * successful. | |
3448 | */ | |
65205cc4 | 3449 | if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) |
1da177e4 LT |
3450 | all_param_pass = 1; |
3451 | ||
3452 | /* Process the TLVs contained in the last sent ASCONF chunk. */ | |
3453 | while (asconf_len > 0) { | |
3454 | if (all_param_pass) | |
3455 | err_code = SCTP_ERROR_NO_ERROR; | |
3456 | else { | |
3457 | err_code = sctp_get_asconf_response(asconf_ack, | |
3458 | asconf_param, | |
3459 | no_err); | |
3460 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) | |
3461 | no_err = 0; | |
3462 | } | |
3463 | ||
3464 | switch (err_code) { | |
3465 | case SCTP_ERROR_NO_ERROR: | |
425e0f68 | 3466 | sctp_asconf_param_success(asoc, asconf_param); |
1da177e4 LT |
3467 | break; |
3468 | ||
3469 | case SCTP_ERROR_RSRC_LOW: | |
3470 | retval = 1; | |
3471 | break; | |
3472 | ||
a987f762 | 3473 | case SCTP_ERROR_UNKNOWN_PARAM: |
1da177e4 LT |
3474 | /* Disable sending this type of asconf parameter in |
3475 | * future. | |
d808ad9a | 3476 | */ |
1da177e4 LT |
3477 | asoc->peer.addip_disabled_mask |= |
3478 | asconf_param->param_hdr.type; | |
3479 | break; | |
3480 | ||
3481 | case SCTP_ERROR_REQ_REFUSED: | |
3482 | case SCTP_ERROR_DEL_LAST_IP: | |
3483 | case SCTP_ERROR_DEL_SRC_IP: | |
3484 | default: | |
3485 | break; | |
3486 | } | |
3487 | ||
3488 | /* Skip the processed asconf parameter and move to the next | |
3489 | * one. | |
d808ad9a | 3490 | */ |
1da177e4 | 3491 | length = ntohs(asconf_param->param_hdr.length); |
ea110733 | 3492 | asconf_param = (void *)asconf_param + length; |
1da177e4 LT |
3493 | asconf_len -= length; |
3494 | } | |
3495 | ||
ddc4bbee | 3496 | if (no_err && asoc->src_out_of_asoc_ok) { |
8a07eb0a | 3497 | asoc->src_out_of_asoc_ok = 0; |
ddc4bbee MH |
3498 | sctp_transport_immediate_rtx(asoc->peer.primary_path); |
3499 | } | |
8a07eb0a | 3500 | |
1da177e4 | 3501 | /* Free the cached last sent asconf chunk. */ |
5f9646c3 | 3502 | list_del_init(&asconf->transmitted_list); |
1da177e4 LT |
3503 | sctp_chunk_free(asconf); |
3504 | asoc->addip_last_asconf = NULL; | |
3505 | ||
1da177e4 LT |
3506 | return retval; |
3507 | } | |
3508 | ||
d808ad9a | 3509 | /* Make a FWD TSN chunk. */ |
1da177e4 LT |
3510 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
3511 | __u32 new_cum_tsn, size_t nstreams, | |
3512 | struct sctp_fwdtsn_skip *skiplist) | |
3513 | { | |
3514 | struct sctp_chunk *retval = NULL; | |
d808ad9a | 3515 | struct sctp_fwdtsn_hdr ftsn_hdr; |
1da177e4 LT |
3516 | struct sctp_fwdtsn_skip skip; |
3517 | size_t hint; | |
3518 | int i; | |
3519 | ||
3520 | hint = (nstreams + 1) * sizeof(__u32); | |
3521 | ||
cea8768f | 3522 | retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); |
1da177e4 LT |
3523 | |
3524 | if (!retval) | |
3525 | return NULL; | |
3526 | ||
1da177e4 LT |
3527 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
3528 | retval->subh.fwdtsn_hdr = | |
3529 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3530 | ||
3531 | for (i = 0; i < nstreams; i++) { | |
3532 | skip.stream = skiplist[i].stream; | |
3533 | skip.ssn = skiplist[i].ssn; | |
3534 | sctp_addto_chunk(retval, sizeof(skip), &skip); | |
3535 | } | |
3536 | ||
3537 | return retval; | |
3538 | } | |
cc16f00f | 3539 | |
2d07a49a XL |
3540 | struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc, |
3541 | __u32 new_cum_tsn, size_t nstreams, | |
3542 | struct sctp_ifwdtsn_skip *skiplist) | |
3543 | { | |
3544 | struct sctp_chunk *retval = NULL; | |
3545 | struct sctp_ifwdtsn_hdr ftsn_hdr; | |
3546 | size_t hint; | |
3547 | ||
3548 | hint = (nstreams + 1) * sizeof(__u32); | |
3549 | ||
3550 | retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint, | |
3551 | GFP_ATOMIC); | |
3552 | if (!retval) | |
3553 | return NULL; | |
3554 | ||
3555 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); | |
3556 | retval->subh.ifwdtsn_hdr = | |
3557 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); | |
3558 | ||
3559 | sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist); | |
3560 | ||
3561 | return retval; | |
3562 | } | |
3563 | ||
cc16f00f XL |
3564 | /* RE-CONFIG 3.1 (RE-CONFIG chunk) |
3565 | * 0 1 2 3 | |
3566 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3567 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3568 | * | Type = 130 | Chunk Flags | Chunk Length | | |
3569 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3570 | * \ \ | |
3571 | * / Re-configuration Parameter / | |
3572 | * \ \ | |
3573 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3574 | * \ \ | |
3575 | * / Re-configuration Parameter (optional) / | |
3576 | * \ \ | |
3577 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3578 | */ | |
327c0dab XL |
3579 | static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, |
3580 | int length) | |
cc16f00f XL |
3581 | { |
3582 | struct sctp_reconf_chunk *reconf; | |
3583 | struct sctp_chunk *retval; | |
3584 | ||
3585 | retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, | |
3586 | GFP_ATOMIC); | |
3587 | if (!retval) | |
3588 | return NULL; | |
3589 | ||
3590 | reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; | |
3591 | retval->param_hdr.v = reconf->params; | |
3592 | ||
3593 | return retval; | |
3594 | } | |
3595 | ||
3596 | /* RE-CONFIG 4.1 (STREAM OUT RESET) | |
3597 | * 0 1 2 3 | |
3598 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3600 | * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | | |
3601 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3602 | * | Re-configuration Request Sequence Number | | |
3603 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3604 | * | Re-configuration Response Sequence Number | | |
3605 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3606 | * | Sender's Last Assigned TSN | | |
3607 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3608 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3609 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3610 | * / ...... / | |
3611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3612 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3614 | * | |
3615 | * RE-CONFIG 4.2 (STREAM IN RESET) | |
3616 | * 0 1 2 3 | |
3617 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3618 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3619 | * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | | |
3620 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3621 | * | Re-configuration Request Sequence Number | | |
3622 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3623 | * | Stream Number 1 (optional) | Stream Number 2 (optional) | | |
3624 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3625 | * / ...... / | |
3626 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3627 | * | Stream Number N-1 (optional) | Stream Number N (optional) | | |
3628 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3629 | */ | |
3630 | struct sctp_chunk *sctp_make_strreset_req( | |
327c0dab | 3631 | const struct sctp_association *asoc, |
1da4fc97 | 3632 | __u16 stream_num, __be16 *stream_list, |
327c0dab | 3633 | bool out, bool in) |
cc16f00f | 3634 | { |
423852f8 | 3635 | __u16 stream_len = stream_num * sizeof(__u16); |
cc16f00f | 3636 | struct sctp_strreset_outreq outreq; |
cc16f00f XL |
3637 | struct sctp_strreset_inreq inreq; |
3638 | struct sctp_chunk *retval; | |
16e1a919 | 3639 | __u16 outlen, inlen; |
cc16f00f XL |
3640 | |
3641 | outlen = (sizeof(outreq) + stream_len) * out; | |
3642 | inlen = (sizeof(inreq) + stream_len) * in; | |
3643 | ||
3644 | retval = sctp_make_reconf(asoc, outlen + inlen); | |
3645 | if (!retval) | |
3646 | return NULL; | |
3647 | ||
cc16f00f XL |
3648 | if (outlen) { |
3649 | outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; | |
3650 | outreq.param_hdr.length = htons(outlen); | |
3651 | outreq.request_seq = htonl(asoc->strreset_outseq); | |
3652 | outreq.response_seq = htonl(asoc->strreset_inseq - 1); | |
3653 | outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); | |
3654 | ||
3655 | sctp_addto_chunk(retval, sizeof(outreq), &outreq); | |
3656 | ||
3657 | if (stream_len) | |
3658 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3659 | } | |
3660 | ||
3661 | if (inlen) { | |
3662 | inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; | |
3663 | inreq.param_hdr.length = htons(inlen); | |
3664 | inreq.request_seq = htonl(asoc->strreset_outseq + out); | |
3665 | ||
3666 | sctp_addto_chunk(retval, sizeof(inreq), &inreq); | |
3667 | ||
3668 | if (stream_len) | |
3669 | sctp_addto_chunk(retval, stream_len, stream_list); | |
3670 | } | |
3671 | ||
cc16f00f XL |
3672 | return retval; |
3673 | } | |
c56480a1 XL |
3674 | |
3675 | /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) | |
3676 | * 0 1 2 3 | |
3677 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3678 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3679 | * | Parameter Type = 15 | Parameter Length = 8 | | |
3680 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3681 | * | Re-configuration Request Sequence Number | | |
3682 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3683 | */ | |
3684 | struct sctp_chunk *sctp_make_strreset_tsnreq( | |
327c0dab | 3685 | const struct sctp_association *asoc) |
c56480a1 XL |
3686 | { |
3687 | struct sctp_strreset_tsnreq tsnreq; | |
3688 | __u16 length = sizeof(tsnreq); | |
3689 | struct sctp_chunk *retval; | |
3690 | ||
3691 | retval = sctp_make_reconf(asoc, length); | |
3692 | if (!retval) | |
3693 | return NULL; | |
3694 | ||
3695 | tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; | |
3696 | tsnreq.param_hdr.length = htons(length); | |
3697 | tsnreq.request_seq = htonl(asoc->strreset_outseq); | |
3698 | ||
3699 | sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); | |
3700 | ||
3701 | return retval; | |
3702 | } | |
78098117 XL |
3703 | |
3704 | /* RE-CONFIG 4.5/4.6 (ADD STREAM) | |
3705 | * 0 1 2 3 | |
3706 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3707 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3708 | * | Parameter Type = 17 | Parameter Length = 12 | | |
3709 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3710 | * | Re-configuration Request Sequence Number | | |
3711 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3712 | * | Number of new streams | Reserved | | |
3713 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3714 | */ | |
3715 | struct sctp_chunk *sctp_make_strreset_addstrm( | |
327c0dab XL |
3716 | const struct sctp_association *asoc, |
3717 | __u16 out, __u16 in) | |
78098117 XL |
3718 | { |
3719 | struct sctp_strreset_addstrm addstrm; | |
3720 | __u16 size = sizeof(addstrm); | |
3721 | struct sctp_chunk *retval; | |
3722 | ||
3723 | retval = sctp_make_reconf(asoc, (!!out + !!in) * size); | |
3724 | if (!retval) | |
3725 | return NULL; | |
3726 | ||
3727 | if (out) { | |
3728 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; | |
3729 | addstrm.param_hdr.length = htons(size); | |
3730 | addstrm.number_of_streams = htons(out); | |
3731 | addstrm.request_seq = htonl(asoc->strreset_outseq); | |
3732 | addstrm.reserved = 0; | |
3733 | ||
3734 | sctp_addto_chunk(retval, size, &addstrm); | |
3735 | } | |
3736 | ||
3737 | if (in) { | |
3738 | addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; | |
3739 | addstrm.param_hdr.length = htons(size); | |
3740 | addstrm.number_of_streams = htons(in); | |
3741 | addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); | |
3742 | addstrm.reserved = 0; | |
3743 | ||
3744 | sctp_addto_chunk(retval, size, &addstrm); | |
3745 | } | |
3746 | ||
3747 | return retval; | |
3748 | } | |
bd4b9f8b XL |
3749 | |
3750 | /* RE-CONFIG 4.4 (RESP) | |
3751 | * 0 1 2 3 | |
3752 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3753 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3754 | * | Parameter Type = 16 | Parameter Length | | |
3755 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3756 | * | Re-configuration Response Sequence Number | | |
3757 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3758 | * | Result | | |
3759 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3760 | */ | |
327c0dab XL |
3761 | struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, |
3762 | __u32 result, __u32 sn) | |
bd4b9f8b XL |
3763 | { |
3764 | struct sctp_strreset_resp resp; | |
3765 | __u16 length = sizeof(resp); | |
3766 | struct sctp_chunk *retval; | |
3767 | ||
3768 | retval = sctp_make_reconf(asoc, length); | |
3769 | if (!retval) | |
3770 | return NULL; | |
3771 | ||
3772 | resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3773 | resp.param_hdr.length = htons(length); | |
3774 | resp.response_seq = htonl(sn); | |
3775 | resp.result = htonl(result); | |
3776 | ||
3777 | sctp_addto_chunk(retval, sizeof(resp), &resp); | |
3778 | ||
3779 | return retval; | |
3780 | } | |
3781 | ||
3782 | /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) | |
3783 | * 0 1 2 3 | |
3784 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
3785 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3786 | * | Parameter Type = 16 | Parameter Length | | |
3787 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3788 | * | Re-configuration Response Sequence Number | | |
3789 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3790 | * | Result | | |
3791 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3792 | * | Sender's Next TSN (optional) | | |
3793 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3794 | * | Receiver's Next TSN (optional) | | |
3795 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
3796 | */ | |
327c0dab XL |
3797 | struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, |
3798 | __u32 result, __u32 sn, | |
3799 | __u32 sender_tsn, | |
3800 | __u32 receiver_tsn) | |
bd4b9f8b XL |
3801 | { |
3802 | struct sctp_strreset_resptsn tsnresp; | |
3803 | __u16 length = sizeof(tsnresp); | |
3804 | struct sctp_chunk *retval; | |
3805 | ||
3806 | retval = sctp_make_reconf(asoc, length); | |
3807 | if (!retval) | |
3808 | return NULL; | |
3809 | ||
3810 | tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; | |
3811 | tsnresp.param_hdr.length = htons(length); | |
3812 | ||
3813 | tsnresp.response_seq = htonl(sn); | |
3814 | tsnresp.result = htonl(result); | |
3815 | tsnresp.senders_next_tsn = htonl(sender_tsn); | |
3816 | tsnresp.receivers_next_tsn = htonl(receiver_tsn); | |
3817 | ||
3818 | sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); | |
3819 | ||
3820 | return retval; | |
3821 | } | |
ea625043 XL |
3822 | |
3823 | bool sctp_verify_reconf(const struct sctp_association *asoc, | |
3824 | struct sctp_chunk *chunk, | |
3825 | struct sctp_paramhdr **errp) | |
3826 | { | |
3827 | struct sctp_reconf_chunk *hdr; | |
3828 | union sctp_params param; | |
1da4fc97 XL |
3829 | __be16 last = 0; |
3830 | __u16 cnt = 0; | |
ea625043 XL |
3831 | |
3832 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3833 | sctp_walk_params(param, hdr, params) { | |
3834 | __u16 length = ntohs(param.p->length); | |
3835 | ||
3836 | *errp = param.p; | |
3837 | if (cnt++ > 2) | |
3838 | return false; | |
3839 | switch (param.p->type) { | |
3840 | case SCTP_PARAM_RESET_OUT_REQUEST: | |
3841 | if (length < sizeof(struct sctp_strreset_outreq) || | |
3842 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3843 | last != SCTP_PARAM_RESET_IN_REQUEST)) | |
3844 | return false; | |
3845 | break; | |
3846 | case SCTP_PARAM_RESET_IN_REQUEST: | |
3847 | if (length < sizeof(struct sctp_strreset_inreq) || | |
3848 | (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3849 | return false; | |
3850 | break; | |
3851 | case SCTP_PARAM_RESET_RESPONSE: | |
3852 | if ((length != sizeof(struct sctp_strreset_resp) && | |
3853 | length != sizeof(struct sctp_strreset_resptsn)) || | |
3854 | (last && last != SCTP_PARAM_RESET_RESPONSE && | |
3855 | last != SCTP_PARAM_RESET_OUT_REQUEST)) | |
3856 | return false; | |
3857 | break; | |
3858 | case SCTP_PARAM_RESET_TSN_REQUEST: | |
3859 | if (length != | |
3860 | sizeof(struct sctp_strreset_tsnreq) || last) | |
3861 | return false; | |
3862 | break; | |
3863 | case SCTP_PARAM_RESET_ADD_IN_STREAMS: | |
3864 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3865 | (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) | |
3866 | return false; | |
3867 | break; | |
3868 | case SCTP_PARAM_RESET_ADD_OUT_STREAMS: | |
3869 | if (length != sizeof(struct sctp_strreset_addstrm) || | |
3870 | (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) | |
3871 | return false; | |
3872 | break; | |
3873 | default: | |
3874 | return false; | |
3875 | } | |
3876 | ||
3877 | last = param.p->type; | |
3878 | } | |
3879 | ||
3880 | return true; | |
3881 | } |