Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/net/sctp/sm_make_chunk.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 83748 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* SCTP kernel reference Implementation |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. |
4 | * Copyright (c) 1999-2001 Motorola, Inc. |
5 | * Copyright (c) 2001-2002 Intel Corp. |
6 | * |
7 | * This file is part of the SCTP kernel reference Implementation |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c |
10 | * to implement the state operations. These functions implement the |
11 | * steps which require modifying existing data structures. |
12 | * |
13 | * The SCTP reference implementation is free software; |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2, or (at your option) |
17 | * any later version. |
18 | * |
19 | * The SCTP reference implementation is distributed in the hope that it |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
23 | * See the GNU General Public License for more details. |
24 | * |
25 | * You should have received a copy of the GNU General Public License |
26 | * along with GNU CC; see the file COPYING. If not, write to |
27 | * the Free Software Foundation, 59 Temple Place - Suite 330, |
28 | * Boston, MA 02111-1307, USA. |
29 | * |
30 | * Please send any bug reports or fixes you make to the |
31 | * email address(es): |
32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> |
33 | * |
34 | * Or submit a bug report through the following website: |
35 | * http://www.sf.net/projects/lksctp |
36 | * |
37 | * Written or modified by: |
38 | * La Monte H.P. Yarroll <piggy@acm.org> |
39 | * Karl Knutson <karl@athena.chicago.il.us> |
40 | * C. Robin <chris@hundredacre.ac.uk> |
41 | * Jon Grimm <jgrimm@us.ibm.com> |
42 | * Xingang Guo <xingang.guo@intel.com> |
43 | * Dajiang Zhang <dajiang.zhang@nokia.com> |
44 | * Sridhar Samudrala <sri@us.ibm.com> |
45 | * Daisy Chang <daisyc@us.ibm.com> |
46 | * Ardelle Fan <ardelle.fan@intel.com> |
47 | * Kevin Gao <kevin.gao@intel.com> |
48 | * |
49 | * Any bugs reported given to us we will try to fix... any fixes shared will |
50 | * be incorporated into the next SCTP release. |
51 | */ |
52 | |
53 | #include <linux/types.h> |
54 | #include <linux/kernel.h> |
55 | #include <linux/ip.h> |
56 | #include <linux/ipv6.h> |
57 | #include <linux/net.h> |
58 | #include <linux/inet.h> |
59 | #include <asm/scatterlist.h> |
60 | #include <linux/crypto.h> |
61 | #include <net/sock.h> |
62 | |
63 | #include <linux/skbuff.h> |
64 | #include <linux/random.h> /* for get_random_bytes */ |
65 | #include <net/sctp/sctp.h> |
66 | #include <net/sctp/sm.h> |
67 | |
68 | extern kmem_cache_t *sctp_chunk_cachep; |
69 | |
70 | SCTP_STATIC |
71 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, |
72 | __u8 type, __u8 flags, int paylen); |
73 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
74 | const struct sctp_association *asoc, |
75 | const struct sctp_chunk *init_chunk, |
76 | int *cookie_len, |
77 | const __u8 *raw_addrs, int addrs_len); |
78 | static int sctp_process_param(struct sctp_association *asoc, |
79 | union sctp_params param, |
80 | const union sctp_addr *peer_addr, |
81 | int gfp); |
82 | |
83 | /* What was the inbound interface for this chunk? */ |
84 | int sctp_chunk_iif(const struct sctp_chunk *chunk) |
85 | { |
86 | struct sctp_af *af; |
87 | int iif = 0; |
88 | |
89 | af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version)); |
90 | if (af) |
91 | iif = af->skb_iif(chunk->skb); |
92 | |
93 | return iif; |
94 | } |
95 | |
96 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
97 | * |
98 | * Note 2: The ECN capable field is reserved for future use of |
99 | * Explicit Congestion Notification. |
100 | */ |
101 | static const struct sctp_paramhdr ecap_param = { |
102 | SCTP_PARAM_ECN_CAPABLE, |
103 | __constant_htons(sizeof(struct sctp_paramhdr)), |
104 | }; |
105 | static const struct sctp_paramhdr prsctp_param = { |
106 | SCTP_PARAM_FWD_TSN_SUPPORT, |
107 | __constant_htons(sizeof(struct sctp_paramhdr)), |
108 | }; |
109 | |
110 | /* A helper to initialize to initialize an op error inside a |
111 | * provided chunk, as most cause codes will be embedded inside an |
112 | * abort chunk. |
113 | */ |
114 | void sctp_init_cause(struct sctp_chunk *chunk, __u16 cause_code, |
115 | const void *payload, size_t paylen) |
116 | { |
117 | sctp_errhdr_t err; |
118 | int padlen; |
119 | __u16 len; |
120 | |
121 | /* Cause code constants are now defined in network order. */ |
122 | err.cause = cause_code; |
123 | len = sizeof(sctp_errhdr_t) + paylen; |
124 | padlen = len % 4; |
125 | err.length = htons(len); |
126 | len += padlen; |
127 | sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); |
128 | chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload); |
129 | } |
130 | |
131 | /* 3.3.2 Initiation (INIT) (1) |
132 | * |
133 | * This chunk is used to initiate a SCTP association between two |
134 | * endpoints. The format of the INIT chunk is shown below: |
135 | * |
136 | * 0 1 2 3 |
137 | * 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 |
138 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
139 | * | Type = 1 | Chunk Flags | Chunk Length | |
140 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
141 | * | Initiate Tag | |
142 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
143 | * | Advertised Receiver Window Credit (a_rwnd) | |
144 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
145 | * | Number of Outbound Streams | Number of Inbound Streams | |
146 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
147 | * | Initial TSN | |
148 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
149 | * \ \ |
150 | * / Optional/Variable-Length Parameters / |
151 | * \ \ |
152 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
153 | * |
154 | * |
155 | * The INIT chunk contains the following parameters. Unless otherwise |
156 | * noted, each parameter MUST only be included once in the INIT chunk. |
157 | * |
158 | * Fixed Parameters Status |
159 | * ---------------------------------------------- |
160 | * Initiate Tag Mandatory |
161 | * Advertised Receiver Window Credit Mandatory |
162 | * Number of Outbound Streams Mandatory |
163 | * Number of Inbound Streams Mandatory |
164 | * Initial TSN Mandatory |
165 | * |
166 | * Variable Parameters Status Type Value |
167 | * ------------------------------------------------------------- |
168 | * IPv4 Address (Note 1) Optional 5 |
169 | * IPv6 Address (Note 1) Optional 6 |
170 | * Cookie Preservative Optional 9 |
171 | * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) |
172 | * Host Name Address (Note 3) Optional 11 |
173 | * Supported Address Types (Note 4) Optional 12 |
174 | */ |
175 | struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, |
176 | const struct sctp_bind_addr *bp, |
177 | int gfp, int vparam_len) |
178 | { |
179 | sctp_inithdr_t init; |
180 | union sctp_params addrs; |
181 | size_t chunksize; |
182 | struct sctp_chunk *retval = NULL; |
183 | int num_types, addrs_len = 0; |
184 | struct sctp_sock *sp; |
185 | sctp_supported_addrs_param_t sat; |
186 | __u16 types[2]; |
187 | sctp_adaption_ind_param_t aiparam; |
188 | |
189 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
190 | * |
191 | * Note 1: The INIT chunks can contain multiple addresses that |
192 | * can be IPv4 and/or IPv6 in any combination. |
193 | */ |
194 | retval = NULL; |
195 | |
196 | /* Convert the provided bind address list to raw format. */ |
197 | addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); |
198 | |
199 | init.init_tag = htonl(asoc->c.my_vtag); |
200 | init.a_rwnd = htonl(asoc->rwnd); |
201 | init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); |
202 | init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); |
203 | init.initial_tsn = htonl(asoc->c.initial_tsn); |
204 | |
205 | /* How many address types are needed? */ |
206 | sp = sctp_sk(asoc->base.sk); |
207 | num_types = sp->pf->supported_addrs(sp, types); |
208 | |
209 | chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); |
210 | chunksize += sizeof(ecap_param); |
211 | if (sctp_prsctp_enable) |
212 | chunksize += sizeof(prsctp_param); |
213 | chunksize += sizeof(aiparam); |
214 | chunksize += vparam_len; |
215 | |
216 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
217 | * |
218 | * Note 3: An INIT chunk MUST NOT contain more than one Host |
219 | * Name address parameter. Moreover, the sender of the INIT |
220 | * MUST NOT combine any other address types with the Host Name |
221 | * address in the INIT. The receiver of INIT MUST ignore any |
222 | * other address types if the Host Name address parameter is |
223 | * present in the received INIT chunk. |
224 | * |
225 | * PLEASE DO NOT FIXME [This version does not support Host Name.] |
226 | */ |
227 | |
228 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); |
229 | if (!retval) |
230 | goto nodata; |
231 | |
232 | retval->subh.init_hdr = |
233 | sctp_addto_chunk(retval, sizeof(init), &init); |
234 | retval->param_hdr.v = |
235 | sctp_addto_chunk(retval, addrs_len, addrs.v); |
236 | |
237 | /* RFC 2960 3.3.2 Initiation (INIT) (1) |
238 | * |
239 | * Note 4: This parameter, when present, specifies all the |
240 | * address types the sending endpoint can support. The absence |
241 | * of this parameter indicates that the sending endpoint can |
242 | * support any address type. |
243 | */ |
244 | sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; |
245 | sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); |
246 | sctp_addto_chunk(retval, sizeof(sat), &sat); |
247 | sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); |
248 | |
249 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); |
250 | if (sctp_prsctp_enable) |
251 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
252 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; |
253 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
254 | aiparam.adaption_ind = htonl(sp->adaption_ind); |
255 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
256 | nodata: |
257 | if (addrs.v) |
258 | kfree(addrs.v); |
259 | return retval; |
260 | } |
261 | |
262 | struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, |
263 | const struct sctp_chunk *chunk, |
264 | int gfp, int unkparam_len) |
265 | { |
266 | sctp_inithdr_t initack; |
267 | struct sctp_chunk *retval; |
268 | union sctp_params addrs; |
269 | int addrs_len; |
270 | sctp_cookie_param_t *cookie; |
271 | int cookie_len; |
272 | size_t chunksize; |
273 | sctp_adaption_ind_param_t aiparam; |
274 | |
275 | retval = NULL; |
276 | |
277 | /* Note: there may be no addresses to embed. */ |
278 | addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); |
279 | |
280 | initack.init_tag = htonl(asoc->c.my_vtag); |
281 | initack.a_rwnd = htonl(asoc->rwnd); |
282 | initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); |
283 | initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); |
284 | initack.initial_tsn = htonl(asoc->c.initial_tsn); |
285 | |
286 | /* FIXME: We really ought to build the cookie right |
287 | * into the packet instead of allocating more fresh memory. |
288 | */ |
289 | cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, |
290 | addrs.v, addrs_len); |
291 | if (!cookie) |
292 | goto nomem_cookie; |
293 | |
294 | /* Calculate the total size of allocation, include the reserved |
295 | * space for reporting unknown parameters if it is specified. |
296 | */ |
297 | chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; |
298 | |
299 | /* Tell peer that we'll do ECN only if peer advertised such cap. */ |
300 | if (asoc->peer.ecn_capable) |
301 | chunksize += sizeof(ecap_param); |
302 | |
303 | /* Tell peer that we'll do PR-SCTP only if peer advertised. */ |
304 | if (asoc->peer.prsctp_capable) |
305 | chunksize += sizeof(prsctp_param); |
306 | |
307 | chunksize += sizeof(aiparam); |
308 | |
309 | /* Now allocate and fill out the chunk. */ |
310 | retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); |
311 | if (!retval) |
312 | goto nomem_chunk; |
313 | |
314 | /* Per the advice in RFC 2960 6.4, send this reply to |
315 | * the source of the INIT packet. |
316 | */ |
317 | retval->transport = chunk->transport; |
318 | retval->subh.init_hdr = |
319 | sctp_addto_chunk(retval, sizeof(initack), &initack); |
320 | retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); |
321 | sctp_addto_chunk(retval, cookie_len, cookie); |
322 | if (asoc->peer.ecn_capable) |
323 | sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); |
324 | if (asoc->peer.prsctp_capable) |
325 | sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); |
326 | |
327 | aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; |
328 | aiparam.param_hdr.length = htons(sizeof(aiparam)); |
329 | aiparam.adaption_ind = htonl(sctp_sk(asoc->base.sk)->adaption_ind); |
330 | sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); |
331 | |
332 | /* We need to remove the const qualifier at this point. */ |
333 | retval->asoc = (struct sctp_association *) asoc; |
334 | |
335 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
336 | * |
337 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
338 | * HEARTBEAT ACK, * etc.) to the same destination transport |
339 | * address from which it received the DATA or control chunk |
340 | * to which it is replying. |
341 | * |
342 | * [INIT ACK back to where the INIT came from.] |
343 | */ |
344 | if (chunk) |
345 | retval->transport = chunk->transport; |
346 | |
347 | nomem_chunk: |
348 | kfree(cookie); |
349 | nomem_cookie: |
350 | if (addrs.v) |
351 | kfree(addrs.v); |
352 | return retval; |
353 | } |
354 | |
355 | /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): |
356 | * |
357 | * This chunk is used only during the initialization of an association. |
358 | * It is sent by the initiator of an association to its peer to complete |
359 | * the initialization process. This chunk MUST precede any DATA chunk |
360 | * sent within the association, but MAY be bundled with one or more DATA |
361 | * chunks in the same packet. |
362 | * |
363 | * 0 1 2 3 |
364 | * 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 |
365 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
366 | * | Type = 10 |Chunk Flags | Length | |
367 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
368 | * / Cookie / |
369 | * \ \ |
370 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
371 | * |
372 | * Chunk Flags: 8 bit |
373 | * |
374 | * Set to zero on transmit and ignored on receipt. |
375 | * |
376 | * Length: 16 bits (unsigned integer) |
377 | * |
378 | * Set to the size of the chunk in bytes, including the 4 bytes of |
379 | * the chunk header and the size of the Cookie. |
380 | * |
381 | * Cookie: variable size |
382 | * |
383 | * This field must contain the exact cookie received in the |
384 | * State Cookie parameter from the previous INIT ACK. |
385 | * |
386 | * An implementation SHOULD make the cookie as small as possible |
387 | * to insure interoperability. |
388 | */ |
389 | struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, |
390 | const struct sctp_chunk *chunk) |
391 | { |
392 | struct sctp_chunk *retval; |
393 | void *cookie; |
394 | int cookie_len; |
395 | |
396 | cookie = asoc->peer.cookie; |
397 | cookie_len = asoc->peer.cookie_len; |
398 | |
399 | /* Build a cookie echo chunk. */ |
400 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); |
401 | if (!retval) |
402 | goto nodata; |
403 | retval->subh.cookie_hdr = |
404 | sctp_addto_chunk(retval, cookie_len, cookie); |
405 | |
406 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
407 | * |
408 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
409 | * HEARTBEAT ACK, * etc.) to the same destination transport |
410 | * address from which it * received the DATA or control chunk |
411 | * to which it is replying. |
412 | * |
413 | * [COOKIE ECHO back to where the INIT ACK came from.] |
414 | */ |
415 | if (chunk) |
416 | retval->transport = chunk->transport; |
417 | |
418 | nodata: |
419 | return retval; |
420 | } |
421 | |
422 | /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): |
423 | * |
424 | * This chunk is used only during the initialization of an |
425 | * association. It is used to acknowledge the receipt of a COOKIE |
426 | * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent |
427 | * within the association, but MAY be bundled with one or more DATA |
428 | * chunks or SACK chunk in the same SCTP packet. |
429 | * |
430 | * 0 1 2 3 |
431 | * 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 |
432 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
433 | * | Type = 11 |Chunk Flags | Length = 4 | |
434 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
435 | * |
436 | * Chunk Flags: 8 bits |
437 | * |
438 | * Set to zero on transmit and ignored on receipt. |
439 | */ |
440 | struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, |
441 | const struct sctp_chunk *chunk) |
442 | { |
443 | struct sctp_chunk *retval; |
444 | |
445 | retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); |
446 | |
447 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
448 | * |
449 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
450 | * HEARTBEAT ACK, * etc.) to the same destination transport |
451 | * address from which it * received the DATA or control chunk |
452 | * to which it is replying. |
453 | * |
454 | * [COOKIE ACK back to where the COOKIE ECHO came from.] |
455 | */ |
456 | if (retval && chunk) |
457 | retval->transport = chunk->transport; |
458 | |
459 | return retval; |
460 | } |
461 | |
462 | /* |
463 | * Appendix A: Explicit Congestion Notification: |
464 | * CWR: |
465 | * |
466 | * RFC 2481 details a specific bit for a sender to send in the header of |
467 | * its next outbound TCP segment to indicate to its peer that it has |
468 | * reduced its congestion window. This is termed the CWR bit. For |
469 | * SCTP the same indication is made by including the CWR chunk. |
470 | * This chunk contains one data element, i.e. the TSN number that |
471 | * was sent in the ECNE chunk. This element represents the lowest |
472 | * TSN number in the datagram that was originally marked with the |
473 | * CE bit. |
474 | * |
475 | * 0 1 2 3 |
476 | * 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 |
477 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
478 | * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | |
479 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
480 | * | Lowest TSN Number | |
481 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
482 | * |
483 | * Note: The CWR is considered a Control chunk. |
484 | */ |
485 | struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, |
486 | const __u32 lowest_tsn, |
487 | const struct sctp_chunk *chunk) |
488 | { |
489 | struct sctp_chunk *retval; |
490 | sctp_cwrhdr_t cwr; |
491 | |
492 | cwr.lowest_tsn = htonl(lowest_tsn); |
493 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, |
494 | sizeof(sctp_cwrhdr_t)); |
495 | |
496 | if (!retval) |
497 | goto nodata; |
498 | |
499 | retval->subh.ecn_cwr_hdr = |
500 | sctp_addto_chunk(retval, sizeof(cwr), &cwr); |
501 | |
502 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
503 | * |
504 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
505 | * HEARTBEAT ACK, * etc.) to the same destination transport |
506 | * address from which it * received the DATA or control chunk |
507 | * to which it is replying. |
508 | * |
509 | * [Report a reduced congestion window back to where the ECNE |
510 | * came from.] |
511 | */ |
512 | if (chunk) |
513 | retval->transport = chunk->transport; |
514 | |
515 | nodata: |
516 | return retval; |
517 | } |
518 | |
519 | /* Make an ECNE chunk. This is a congestion experienced report. */ |
520 | struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, |
521 | const __u32 lowest_tsn) |
522 | { |
523 | struct sctp_chunk *retval; |
524 | sctp_ecnehdr_t ecne; |
525 | |
526 | ecne.lowest_tsn = htonl(lowest_tsn); |
527 | retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, |
528 | sizeof(sctp_ecnehdr_t)); |
529 | if (!retval) |
530 | goto nodata; |
531 | retval->subh.ecne_hdr = |
532 | sctp_addto_chunk(retval, sizeof(ecne), &ecne); |
533 | |
534 | nodata: |
535 | return retval; |
536 | } |
537 | |
538 | /* Make a DATA chunk for the given association from the provided |
539 | * parameters. However, do not populate the data payload. |
540 | */ |
541 | struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, |
542 | const struct sctp_sndrcvinfo *sinfo, |
543 | int data_len, __u8 flags, __u16 ssn) |
544 | { |
545 | struct sctp_chunk *retval; |
546 | struct sctp_datahdr dp; |
547 | int chunk_len; |
548 | |
549 | /* We assign the TSN as LATE as possible, not here when |
550 | * creating the chunk. |
551 | */ |
552 | dp.tsn = 0; |
553 | dp.stream = htons(sinfo->sinfo_stream); |
554 | dp.ppid = sinfo->sinfo_ppid; |
555 | |
556 | /* Set the flags for an unordered send. */ |
557 | if (sinfo->sinfo_flags & MSG_UNORDERED) { |
558 | flags |= SCTP_DATA_UNORDERED; |
559 | dp.ssn = 0; |
560 | } else |
561 | dp.ssn = htons(ssn); |
562 | |
563 | chunk_len = sizeof(dp) + data_len; |
564 | retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); |
565 | if (!retval) |
566 | goto nodata; |
567 | |
568 | retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); |
569 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); |
570 | |
571 | nodata: |
572 | return retval; |
573 | } |
574 | |
575 | /* Create a selective ackowledgement (SACK) for the given |
576 | * association. This reports on which TSN's we've seen to date, |
577 | * including duplicates and gaps. |
578 | */ |
579 | struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) |
580 | { |
581 | struct sctp_chunk *retval; |
582 | struct sctp_sackhdr sack; |
583 | int len; |
584 | __u32 ctsn; |
585 | __u16 num_gabs, num_dup_tsns; |
586 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
587 | |
588 | ctsn = sctp_tsnmap_get_ctsn(map); |
589 | SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); |
590 | |
591 | /* How much room is needed in the chunk? */ |
592 | num_gabs = sctp_tsnmap_num_gabs(map); |
593 | num_dup_tsns = sctp_tsnmap_num_dups(map); |
594 | |
595 | /* Initialize the SACK header. */ |
596 | sack.cum_tsn_ack = htonl(ctsn); |
597 | sack.a_rwnd = htonl(asoc->a_rwnd); |
598 | sack.num_gap_ack_blocks = htons(num_gabs); |
599 | sack.num_dup_tsns = htons(num_dup_tsns); |
600 | |
601 | len = sizeof(sack) |
602 | + sizeof(struct sctp_gap_ack_block) * num_gabs |
603 | + sizeof(__u32) * num_dup_tsns; |
604 | |
605 | /* Create the chunk. */ |
606 | retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); |
607 | if (!retval) |
608 | goto nodata; |
609 | |
610 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
611 | * |
612 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
613 | * HEARTBEAT ACK, etc.) to the same destination transport |
614 | * address from which it received the DATA or control chunk to |
615 | * which it is replying. This rule should also be followed if |
616 | * the endpoint is bundling DATA chunks together with the |
617 | * reply chunk. |
618 | * |
619 | * However, when acknowledging multiple DATA chunks received |
620 | * in packets from different source addresses in a single |
621 | * SACK, the SACK chunk may be transmitted to one of the |
622 | * destination transport addresses from which the DATA or |
623 | * control chunks being acknowledged were received. |
624 | * |
625 | * [BUG: We do not implement the following paragraph. |
626 | * Perhaps we should remember the last transport we used for a |
627 | * SACK and avoid that (if possible) if we have seen any |
628 | * duplicates. --piggy] |
629 | * |
630 | * When a receiver of a duplicate DATA chunk sends a SACK to a |
631 | * multi- homed endpoint it MAY be beneficial to vary the |
632 | * destination address and not use the source address of the |
633 | * DATA chunk. The reason being that receiving a duplicate |
634 | * from a multi-homed endpoint might indicate that the return |
635 | * path (as specified in the source address of the DATA chunk) |
636 | * for the SACK is broken. |
637 | * |
638 | * [Send to the address from which we last received a DATA chunk.] |
639 | */ |
640 | retval->transport = asoc->peer.last_data_from; |
641 | |
642 | retval->subh.sack_hdr = |
643 | sctp_addto_chunk(retval, sizeof(sack), &sack); |
644 | |
645 | /* Add the gap ack block information. */ |
646 | if (num_gabs) |
647 | sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, |
648 | sctp_tsnmap_get_gabs(map)); |
649 | |
650 | /* Add the duplicate TSN information. */ |
651 | if (num_dup_tsns) |
652 | sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, |
653 | sctp_tsnmap_get_dups(map)); |
654 | |
655 | nodata: |
656 | return retval; |
657 | } |
658 | |
659 | /* Make a SHUTDOWN chunk. */ |
660 | struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, |
661 | const struct sctp_chunk *chunk) |
662 | { |
663 | struct sctp_chunk *retval; |
664 | sctp_shutdownhdr_t shut; |
665 | __u32 ctsn; |
666 | |
667 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
668 | shut.cum_tsn_ack = htonl(ctsn); |
669 | |
670 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, |
671 | sizeof(sctp_shutdownhdr_t)); |
672 | if (!retval) |
673 | goto nodata; |
674 | |
675 | retval->subh.shutdown_hdr = |
676 | sctp_addto_chunk(retval, sizeof(shut), &shut); |
677 | |
678 | if (chunk) |
679 | retval->transport = chunk->transport; |
680 | nodata: |
681 | return retval; |
682 | } |
683 | |
684 | struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, |
685 | const struct sctp_chunk *chunk) |
686 | { |
687 | struct sctp_chunk *retval; |
688 | |
689 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); |
690 | |
691 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
692 | * |
693 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
694 | * HEARTBEAT ACK, * etc.) to the same destination transport |
695 | * address from which it * received the DATA or control chunk |
696 | * to which it is replying. |
697 | * |
698 | * [ACK back to where the SHUTDOWN came from.] |
699 | */ |
700 | if (retval && chunk) |
701 | retval->transport = chunk->transport; |
702 | |
703 | return retval; |
704 | } |
705 | |
706 | struct sctp_chunk *sctp_make_shutdown_complete( |
707 | const struct sctp_association *asoc, |
708 | const struct sctp_chunk *chunk) |
709 | { |
710 | struct sctp_chunk *retval; |
711 | __u8 flags = 0; |
712 | |
713 | /* Set the T-bit if we have no association (vtag will be |
714 | * reflected) |
715 | */ |
716 | flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; |
717 | |
718 | retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); |
719 | |
720 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
721 | * |
722 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
723 | * HEARTBEAT ACK, * etc.) to the same destination transport |
724 | * address from which it * received the DATA or control chunk |
725 | * to which it is replying. |
726 | * |
727 | * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK |
728 | * came from.] |
729 | */ |
730 | if (retval && chunk) |
731 | retval->transport = chunk->transport; |
732 | |
733 | return retval; |
734 | } |
735 | |
736 | /* Create an ABORT. Note that we set the T bit if we have no |
737 | * association, except when responding to an INIT (sctpimpguide 2.41). |
738 | */ |
739 | struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, |
740 | const struct sctp_chunk *chunk, |
741 | const size_t hint) |
742 | { |
743 | struct sctp_chunk *retval; |
744 | __u8 flags = 0; |
745 | |
746 | /* Set the T-bit if we have no association and 'chunk' is not |
747 | * an INIT (vtag will be reflected). |
748 | */ |
749 | if (!asoc) { |
750 | if (chunk && chunk->chunk_hdr && |
751 | chunk->chunk_hdr->type == SCTP_CID_INIT) |
752 | flags = 0; |
753 | else |
754 | flags = SCTP_CHUNK_FLAG_T; |
755 | } |
756 | |
757 | retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); |
758 | |
759 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
760 | * |
761 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
762 | * HEARTBEAT ACK, * etc.) to the same destination transport |
763 | * address from which it * received the DATA or control chunk |
764 | * to which it is replying. |
765 | * |
766 | * [ABORT back to where the offender came from.] |
767 | */ |
768 | if (retval && chunk) |
769 | retval->transport = chunk->transport; |
770 | |
771 | return retval; |
772 | } |
773 | |
774 | /* Helper to create ABORT with a NO_USER_DATA error. */ |
775 | struct sctp_chunk *sctp_make_abort_no_data( |
776 | const struct sctp_association *asoc, |
777 | const struct sctp_chunk *chunk, __u32 tsn) |
778 | { |
779 | struct sctp_chunk *retval; |
780 | __u32 payload; |
781 | |
782 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) |
783 | + sizeof(tsn)); |
784 | |
785 | if (!retval) |
786 | goto no_mem; |
787 | |
788 | /* Put the tsn back into network byte order. */ |
789 | payload = htonl(tsn); |
790 | sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload, |
791 | sizeof(payload)); |
792 | |
793 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
794 | * |
795 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
796 | * HEARTBEAT ACK, * etc.) to the same destination transport |
797 | * address from which it * received the DATA or control chunk |
798 | * to which it is replying. |
799 | * |
800 | * [ABORT back to where the offender came from.] |
801 | */ |
802 | if (chunk) |
803 | retval->transport = chunk->transport; |
804 | |
805 | no_mem: |
806 | return retval; |
807 | } |
808 | |
809 | /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ |
810 | struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, |
811 | const struct sctp_chunk *chunk, |
812 | const struct msghdr *msg) |
813 | { |
814 | struct sctp_chunk *retval; |
815 | void *payload = NULL, *payoff; |
816 | size_t paylen = 0; |
817 | struct iovec *iov = NULL; |
818 | int iovlen = 0; |
819 | |
820 | if (msg) { |
821 | iov = msg->msg_iov; |
822 | iovlen = msg->msg_iovlen; |
823 | paylen = get_user_iov_size(iov, iovlen); |
824 | } |
825 | |
826 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen); |
827 | if (!retval) |
828 | goto err_chunk; |
829 | |
830 | if (paylen) { |
831 | /* Put the msg_iov together into payload. */ |
832 | payload = kmalloc(paylen, GFP_ATOMIC); |
833 | if (!payload) |
834 | goto err_payload; |
835 | payoff = payload; |
836 | |
837 | for (; iovlen > 0; --iovlen) { |
838 | if (copy_from_user(payoff, iov->iov_base,iov->iov_len)) |
839 | goto err_copy; |
840 | payoff += iov->iov_len; |
841 | iov++; |
842 | } |
843 | } |
844 | |
845 | sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen); |
846 | |
847 | if (paylen) |
848 | kfree(payload); |
849 | |
850 | return retval; |
851 | |
852 | err_copy: |
853 | kfree(payload); |
854 | err_payload: |
855 | sctp_chunk_free(retval); |
856 | retval = NULL; |
857 | err_chunk: |
858 | return retval; |
859 | } |
860 | |
861 | /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ |
862 | struct sctp_chunk *sctp_make_abort_violation( |
863 | const struct sctp_association *asoc, |
864 | const struct sctp_chunk *chunk, |
865 | const __u8 *payload, |
866 | const size_t paylen) |
867 | { |
868 | struct sctp_chunk *retval; |
869 | struct sctp_paramhdr phdr; |
870 | |
871 | retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen |
872 | + sizeof(sctp_chunkhdr_t)); |
873 | if (!retval) |
874 | goto end; |
875 | |
876 | sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, payload, paylen); |
877 | |
878 | phdr.type = htons(chunk->chunk_hdr->type); |
879 | phdr.length = chunk->chunk_hdr->length; |
880 | sctp_addto_chunk(retval, sizeof(sctp_paramhdr_t), &phdr); |
881 | |
882 | end: |
883 | return retval; |
884 | } |
885 | |
886 | /* Make a HEARTBEAT chunk. */ |
887 | struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, |
888 | const struct sctp_transport *transport, |
889 | const void *payload, const size_t paylen) |
890 | { |
891 | struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, |
892 | 0, paylen); |
893 | |
894 | if (!retval) |
895 | goto nodata; |
896 | |
897 | /* Cast away the 'const', as this is just telling the chunk |
898 | * what transport it belongs to. |
899 | */ |
900 | retval->transport = (struct sctp_transport *) transport; |
901 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); |
902 | |
903 | nodata: |
904 | return retval; |
905 | } |
906 | |
907 | struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, |
908 | const struct sctp_chunk *chunk, |
909 | const void *payload, const size_t paylen) |
910 | { |
911 | struct sctp_chunk *retval; |
912 | |
913 | retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); |
914 | if (!retval) |
915 | goto nodata; |
916 | |
917 | retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); |
918 | |
919 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
920 | * |
921 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
922 | * HEARTBEAT ACK, * etc.) to the same destination transport |
923 | * address from which it * received the DATA or control chunk |
924 | * to which it is replying. |
925 | * |
926 | * [HBACK back to where the HEARTBEAT came from.] |
927 | */ |
928 | if (chunk) |
929 | retval->transport = chunk->transport; |
930 | |
931 | nodata: |
932 | return retval; |
933 | } |
934 | |
935 | /* Create an Operation Error chunk with the specified space reserved. |
936 | * This routine can be used for containing multiple causes in the chunk. |
937 | */ |
938 | static struct sctp_chunk *sctp_make_op_error_space( |
939 | const struct sctp_association *asoc, |
940 | const struct sctp_chunk *chunk, |
941 | size_t size) |
942 | { |
943 | struct sctp_chunk *retval; |
944 | |
945 | retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, |
946 | sizeof(sctp_errhdr_t) + size); |
947 | if (!retval) |
948 | goto nodata; |
949 | |
950 | /* RFC 2960 6.4 Multi-homed SCTP Endpoints |
951 | * |
952 | * An endpoint SHOULD transmit reply chunks (e.g., SACK, |
953 | * HEARTBEAT ACK, etc.) to the same destination transport |
954 | * address from which it received the DATA or control chunk |
955 | * to which it is replying. |
956 | * |
957 | */ |
958 | if (chunk) |
959 | retval->transport = chunk->transport; |
960 | |
961 | nodata: |
962 | return retval; |
963 | } |
964 | |
965 | /* Create an Operation Error chunk. */ |
966 | struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, |
967 | const struct sctp_chunk *chunk, |
968 | __u16 cause_code, const void *payload, |
969 | size_t paylen) |
970 | { |
971 | struct sctp_chunk *retval; |
972 | |
973 | retval = sctp_make_op_error_space(asoc, chunk, paylen); |
974 | if (!retval) |
975 | goto nodata; |
976 | |
977 | sctp_init_cause(retval, cause_code, payload, paylen); |
978 | |
979 | nodata: |
980 | return retval; |
981 | } |
982 | |
983 | /******************************************************************** |
984 | * 2nd Level Abstractions |
985 | ********************************************************************/ |
986 | |
987 | /* Turn an skb into a chunk. |
988 | * FIXME: Eventually move the structure directly inside the skb->cb[]. |
989 | */ |
990 | struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, |
991 | const struct sctp_association *asoc, |
992 | struct sock *sk) |
993 | { |
994 | struct sctp_chunk *retval; |
995 | |
996 | retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC); |
997 | |
998 | if (!retval) |
999 | goto nodata; |
1000 | memset(retval, 0, sizeof(struct sctp_chunk)); |
1001 | |
1002 | if (!sk) { |
1003 | SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); |
1004 | } |
1005 | |
1006 | retval->skb = skb; |
1007 | retval->asoc = (struct sctp_association *)asoc; |
1008 | retval->resent = 0; |
1009 | retval->has_tsn = 0; |
1010 | retval->has_ssn = 0; |
1011 | retval->rtt_in_progress = 0; |
1012 | retval->sent_at = 0; |
1013 | retval->singleton = 1; |
1014 | retval->end_of_packet = 0; |
1015 | retval->ecn_ce_done = 0; |
1016 | retval->pdiscard = 0; |
1017 | |
1018 | /* sctpimpguide-05.txt Section 2.8.2 |
1019 | * M1) Each time a new DATA chunk is transmitted |
1020 | * set the 'TSN.Missing.Report' count for that TSN to 0. The |
1021 | * 'TSN.Missing.Report' count will be used to determine missing chunks |
1022 | * and when to fast retransmit. |
1023 | */ |
1024 | retval->tsn_missing_report = 0; |
1025 | retval->tsn_gap_acked = 0; |
1026 | retval->fast_retransmit = 0; |
1027 | |
1028 | /* If this is a fragmented message, track all fragments |
1029 | * of the message (for SEND_FAILED). |
1030 | */ |
1031 | retval->msg = NULL; |
1032 | |
1033 | /* Polish the bead hole. */ |
1034 | INIT_LIST_HEAD(&retval->transmitted_list); |
1035 | INIT_LIST_HEAD(&retval->frag_list); |
1036 | SCTP_DBG_OBJCNT_INC(chunk); |
1037 | atomic_set(&retval->refcnt, 1); |
1038 | |
1039 | nodata: |
1040 | return retval; |
1041 | } |
1042 | |
1043 | /* Set chunk->source and dest based on the IP header in chunk->skb. */ |
1044 | void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, |
1045 | union sctp_addr *dest) |
1046 | { |
1047 | memcpy(&chunk->source, src, sizeof(union sctp_addr)); |
1048 | memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); |
1049 | } |
1050 | |
1051 | /* Extract the source address from a chunk. */ |
1052 | const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) |
1053 | { |
1054 | /* If we have a known transport, use that. */ |
1055 | if (chunk->transport) { |
1056 | return &chunk->transport->ipaddr; |
1057 | } else { |
1058 | /* Otherwise, extract it from the IP header. */ |
1059 | return &chunk->source; |
1060 | } |
1061 | } |
1062 | |
1063 | /* Create a new chunk, setting the type and flags headers from the |
1064 | * arguments, reserving enough space for a 'paylen' byte payload. |
1065 | */ |
1066 | SCTP_STATIC |
1067 | struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, |
1068 | __u8 type, __u8 flags, int paylen) |
1069 | { |
1070 | struct sctp_chunk *retval; |
1071 | sctp_chunkhdr_t *chunk_hdr; |
1072 | struct sk_buff *skb; |
1073 | struct sock *sk; |
1074 | |
1075 | /* No need to allocate LL here, as this is only a chunk. */ |
1076 | skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), |
1077 | GFP_ATOMIC); |
1078 | if (!skb) |
1079 | goto nodata; |
1080 | |
1081 | /* Make room for the chunk header. */ |
1082 | chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); |
1083 | chunk_hdr->type = type; |
1084 | chunk_hdr->flags = flags; |
1085 | chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); |
1086 | |
1087 | sk = asoc ? asoc->base.sk : NULL; |
1088 | retval = sctp_chunkify(skb, asoc, sk); |
1089 | if (!retval) { |
1090 | kfree_skb(skb); |
1091 | goto nodata; |
1092 | } |
1093 | |
1094 | retval->chunk_hdr = chunk_hdr; |
1095 | retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); |
1096 | |
1097 | /* Set the skb to the belonging sock for accounting. */ |
1098 | skb->sk = sk; |
1099 | |
1100 | return retval; |
1101 | nodata: |
1102 | return NULL; |
1103 | } |
1104 | |
1105 | |
1106 | /* Release the memory occupied by a chunk. */ |
1107 | static void sctp_chunk_destroy(struct sctp_chunk *chunk) |
1108 | { |
1109 | /* Free the chunk skb data and the SCTP_chunk stub itself. */ |
1110 | dev_kfree_skb(chunk->skb); |
1111 | |
1112 | SCTP_DBG_OBJCNT_DEC(chunk); |
1113 | kmem_cache_free(sctp_chunk_cachep, chunk); |
1114 | } |
1115 | |
1116 | /* Possibly, free the chunk. */ |
1117 | void sctp_chunk_free(struct sctp_chunk *chunk) |
1118 | { |
1119 | /* Make sure that we are not on any list. */ |
1120 | skb_unlink((struct sk_buff *) chunk); |
1121 | list_del_init(&chunk->transmitted_list); |
1122 | |
1123 | /* Release our reference on the message tracker. */ |
1124 | if (chunk->msg) |
1125 | sctp_datamsg_put(chunk->msg); |
1126 | |
1127 | sctp_chunk_put(chunk); |
1128 | } |
1129 | |
1130 | /* Grab a reference to the chunk. */ |
1131 | void sctp_chunk_hold(struct sctp_chunk *ch) |
1132 | { |
1133 | atomic_inc(&ch->refcnt); |
1134 | } |
1135 | |
1136 | /* Release a reference to the chunk. */ |
1137 | void sctp_chunk_put(struct sctp_chunk *ch) |
1138 | { |
1139 | if (atomic_dec_and_test(&ch->refcnt)) |
1140 | sctp_chunk_destroy(ch); |
1141 | } |
1142 | |
1143 | /* Append bytes to the end of a chunk. Will panic if chunk is not big |
1144 | * enough. |
1145 | */ |
1146 | void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) |
1147 | { |
1148 | void *target; |
1149 | void *padding; |
1150 | int chunklen = ntohs(chunk->chunk_hdr->length); |
1151 | int padlen = chunklen % 4; |
1152 | |
1153 | padding = skb_put(chunk->skb, padlen); |
1154 | target = skb_put(chunk->skb, len); |
1155 | |
1156 | memset(padding, 0, padlen); |
1157 | memcpy(target, data, len); |
1158 | |
1159 | /* Adjust the chunk length field. */ |
1160 | chunk->chunk_hdr->length = htons(chunklen + padlen + len); |
1161 | chunk->chunk_end = chunk->skb->tail; |
1162 | |
1163 | return target; |
1164 | } |
1165 | |
1166 | /* Append bytes from user space to the end of a chunk. Will panic if |
1167 | * chunk is not big enough. |
1168 | * Returns a kernel err value. |
1169 | */ |
1170 | int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, |
1171 | struct iovec *data) |
1172 | { |
1173 | __u8 *target; |
1174 | int err = 0; |
1175 | |
1176 | /* Make room in chunk for data. */ |
1177 | target = skb_put(chunk->skb, len); |
1178 | |
1179 | /* Copy data (whole iovec) into chunk */ |
1180 | if ((err = memcpy_fromiovecend(target, data, off, len))) |
1181 | goto out; |
1182 | |
1183 | /* Adjust the chunk length field. */ |
1184 | chunk->chunk_hdr->length = |
1185 | htons(ntohs(chunk->chunk_hdr->length) + len); |
1186 | chunk->chunk_end = chunk->skb->tail; |
1187 | |
1188 | out: |
1189 | return err; |
1190 | } |
1191 | |
1192 | /* Helper function to assign a TSN if needed. This assumes that both |
1193 | * the data_hdr and association have already been assigned. |
1194 | */ |
1195 | void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) |
1196 | { |
1197 | __u16 ssn; |
1198 | __u16 sid; |
1199 | |
1200 | if (chunk->has_ssn) |
1201 | return; |
1202 | |
1203 | /* This is the last possible instant to assign a SSN. */ |
1204 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
1205 | ssn = 0; |
1206 | } else { |
1207 | sid = htons(chunk->subh.data_hdr->stream); |
1208 | if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) |
1209 | ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid); |
1210 | else |
1211 | ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid); |
1212 | ssn = htons(ssn); |
1213 | } |
1214 | |
1215 | chunk->subh.data_hdr->ssn = ssn; |
1216 | chunk->has_ssn = 1; |
1217 | } |
1218 | |
1219 | /* Helper function to assign a TSN if needed. This assumes that both |
1220 | * the data_hdr and association have already been assigned. |
1221 | */ |
1222 | void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) |
1223 | { |
1224 | if (!chunk->has_tsn) { |
1225 | /* This is the last possible instant to |
1226 | * assign a TSN. |
1227 | */ |
1228 | chunk->subh.data_hdr->tsn = |
1229 | htonl(sctp_association_get_next_tsn(chunk->asoc)); |
1230 | chunk->has_tsn = 1; |
1231 | } |
1232 | } |
1233 | |
1234 | /* Create a CLOSED association to use with an incoming packet. */ |
1235 | struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, |
1236 | struct sctp_chunk *chunk, int gfp) |
1237 | { |
1238 | struct sctp_association *asoc; |
1239 | struct sk_buff *skb; |
1240 | sctp_scope_t scope; |
1241 | struct sctp_af *af; |
1242 | |
1243 | /* Create the bare association. */ |
1244 | scope = sctp_scope(sctp_source(chunk)); |
1245 | asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); |
1246 | if (!asoc) |
1247 | goto nodata; |
1248 | asoc->temp = 1; |
1249 | skb = chunk->skb; |
1250 | /* Create an entry for the source address of the packet. */ |
1251 | af = sctp_get_af_specific(ipver2af(skb->nh.iph->version)); |
1252 | if (unlikely(!af)) |
1253 | goto fail; |
1254 | af->from_skb(&asoc->c.peer_addr, skb, 1); |
1255 | nodata: |
1256 | return asoc; |
1257 | |
1258 | fail: |
1259 | sctp_association_free(asoc); |
1260 | return NULL; |
1261 | } |
1262 | |
1263 | /* Build a cookie representing asoc. |
1264 | * This INCLUDES the param header needed to put the cookie in the INIT ACK. |
1265 | */ |
1266 | static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, |
1267 | const struct sctp_association *asoc, |
1268 | const struct sctp_chunk *init_chunk, |
1269 | int *cookie_len, |
1270 | const __u8 *raw_addrs, int addrs_len) |
1271 | { |
1272 | sctp_cookie_param_t *retval; |
1273 | struct sctp_signed_cookie *cookie; |
1274 | struct scatterlist sg; |
1275 | int headersize, bodysize; |
1276 | unsigned int keylen; |
1277 | char *key; |
1278 | |
1279 | headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE; |
1280 | bodysize = sizeof(struct sctp_cookie) |
1281 | + ntohs(init_chunk->chunk_hdr->length) + addrs_len; |
1282 | |
1283 | /* Pad out the cookie to a multiple to make the signature |
1284 | * functions simpler to write. |
1285 | */ |
1286 | if (bodysize % SCTP_COOKIE_MULTIPLE) |
1287 | bodysize += SCTP_COOKIE_MULTIPLE |
1288 | - (bodysize % SCTP_COOKIE_MULTIPLE); |
1289 | *cookie_len = headersize + bodysize; |
1290 | |
1291 | retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC); |
1292 | |
1293 | if (!retval) { |
1294 | *cookie_len = 0; |
1295 | goto nodata; |
1296 | } |
1297 | |
1298 | /* Clear this memory since we are sending this data structure |
1299 | * out on the network. |
1300 | */ |
1301 | memset(retval, 0x00, *cookie_len); |
1302 | cookie = (struct sctp_signed_cookie *) retval->body; |
1303 | |
1304 | /* Set up the parameter header. */ |
1305 | retval->p.type = SCTP_PARAM_STATE_COOKIE; |
1306 | retval->p.length = htons(*cookie_len); |
1307 | |
1308 | /* Copy the cookie part of the association itself. */ |
1309 | cookie->c = asoc->c; |
1310 | /* Save the raw address list length in the cookie. */ |
1311 | cookie->c.raw_addr_list_len = addrs_len; |
1312 | |
1313 | /* Remember PR-SCTP capability. */ |
1314 | cookie->c.prsctp_capable = asoc->peer.prsctp_capable; |
1315 | |
1316 | /* Save adaption indication in the cookie. */ |
1317 | cookie->c.adaption_ind = asoc->peer.adaption_ind; |
1318 | |
1319 | /* Set an expiration time for the cookie. */ |
1320 | do_gettimeofday(&cookie->c.expiration); |
1321 | TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); |
1322 | |
1323 | /* Copy the peer's init packet. */ |
1324 | memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, |
1325 | ntohs(init_chunk->chunk_hdr->length)); |
1326 | |
1327 | /* Copy the raw local address list of the association. */ |
1328 | memcpy((__u8 *)&cookie->c.peer_init[0] + |
1329 | ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); |
1330 | |
1331 | if (sctp_sk(ep->base.sk)->hmac) { |
1332 | /* Sign the message. */ |
1333 | sg.page = virt_to_page(&cookie->c); |
1334 | sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE; |
1335 | sg.length = bodysize; |
1336 | keylen = SCTP_SECRET_SIZE; |
1337 | key = (char *)ep->secret_key[ep->current_key]; |
1338 | |
1339 | sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, |
1340 | &sg, 1, cookie->signature); |
1341 | } |
1342 | |
1343 | nodata: |
1344 | return retval; |
1345 | } |
1346 | |
1347 | /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ |
1348 | struct sctp_association *sctp_unpack_cookie( |
1349 | const struct sctp_endpoint *ep, |
1350 | const struct sctp_association *asoc, |
1351 | struct sctp_chunk *chunk, int gfp, |
1352 | int *error, struct sctp_chunk **errp) |
1353 | { |
1354 | struct sctp_association *retval = NULL; |
1355 | struct sctp_signed_cookie *cookie; |
1356 | struct sctp_cookie *bear_cookie; |
1357 | int headersize, bodysize, fixed_size; |
1358 | __u8 digest[SCTP_SIGNATURE_SIZE]; |
1359 | struct scatterlist sg; |
1360 | unsigned int keylen, len; |
1361 | char *key; |
1362 | sctp_scope_t scope; |
1363 | struct sk_buff *skb = chunk->skb; |
1364 | |
1365 | headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE; |
1366 | bodysize = ntohs(chunk->chunk_hdr->length) - headersize; |
1367 | fixed_size = headersize + sizeof(struct sctp_cookie); |
1368 | |
1369 | /* Verify that the chunk looks like it even has a cookie. |
1370 | * There must be enough room for our cookie and our peer's |
1371 | * INIT chunk. |
1372 | */ |
1373 | len = ntohs(chunk->chunk_hdr->length); |
1374 | if (len < fixed_size + sizeof(struct sctp_chunkhdr)) |
1375 | goto malformed; |
1376 | |
1377 | /* Verify that the cookie has been padded out. */ |
1378 | if (bodysize % SCTP_COOKIE_MULTIPLE) |
1379 | goto malformed; |
1380 | |
1381 | /* Process the cookie. */ |
1382 | cookie = chunk->subh.cookie_hdr; |
1383 | bear_cookie = &cookie->c; |
1384 | |
1385 | if (!sctp_sk(ep->base.sk)->hmac) |
1386 | goto no_hmac; |
1387 | |
1388 | /* Check the signature. */ |
1389 | keylen = SCTP_SECRET_SIZE; |
1390 | sg.page = virt_to_page(bear_cookie); |
1391 | sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE; |
1392 | sg.length = bodysize; |
1393 | key = (char *)ep->secret_key[ep->current_key]; |
1394 | |
1395 | memset(digest, 0x00, sizeof(digest)); |
1396 | sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, &sg, |
1397 | 1, digest); |
1398 | |
1399 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { |
1400 | /* Try the previous key. */ |
1401 | key = (char *)ep->secret_key[ep->last_key]; |
1402 | memset(digest, 0x00, sizeof(digest)); |
1403 | sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, |
1404 | &sg, 1, digest); |
1405 | |
1406 | if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { |
1407 | /* Yikes! Still bad signature! */ |
1408 | *error = -SCTP_IERROR_BAD_SIG; |
1409 | goto fail; |
1410 | } |
1411 | } |
1412 | |
1413 | no_hmac: |
1414 | /* IG Section 2.35.2: |
1415 | * 3) Compare the port numbers and the verification tag contained |
1416 | * within the COOKIE ECHO chunk to the actual port numbers and the |
1417 | * verification tag within the SCTP common header of the received |
1418 | * packet. If these values do not match the packet MUST be silently |
1419 | * discarded, |
1420 | */ |
1421 | if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { |
1422 | *error = -SCTP_IERROR_BAD_TAG; |
1423 | goto fail; |
1424 | } |
1425 | |
1426 | if (ntohs(chunk->sctp_hdr->source) != bear_cookie->peer_addr.v4.sin_port || |
1427 | ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { |
1428 | *error = -SCTP_IERROR_BAD_PORTS; |
1429 | goto fail; |
1430 | } |
1431 | |
1432 | /* Check to see if the cookie is stale. If there is already |
1433 | * an association, there is no need to check cookie's expiration |
1434 | * for init collision case of lost COOKIE ACK. |
1435 | */ |
1436 | if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) { |
1437 | __u16 len; |
1438 | /* |
1439 | * Section 3.3.10.3 Stale Cookie Error (3) |
1440 | * |
1441 | * Cause of error |
1442 | * --------------- |
1443 | * Stale Cookie Error: Indicates the receipt of a valid State |
1444 | * Cookie that has expired. |
1445 | */ |
1446 | len = ntohs(chunk->chunk_hdr->length); |
1447 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
1448 | if (*errp) { |
1449 | suseconds_t usecs = (skb->stamp.tv_sec - |
1450 | bear_cookie->expiration.tv_sec) * 1000000L + |
1451 | skb->stamp.tv_usec - |
1452 | bear_cookie->expiration.tv_usec; |
1453 | |
1454 | usecs = htonl(usecs); |
1455 | sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, |
1456 | &usecs, sizeof(usecs)); |
1457 | *error = -SCTP_IERROR_STALE_COOKIE; |
1458 | } else |
1459 | *error = -SCTP_IERROR_NOMEM; |
1460 | |
1461 | goto fail; |
1462 | } |
1463 | |
1464 | /* Make a new base association. */ |
1465 | scope = sctp_scope(sctp_source(chunk)); |
1466 | retval = sctp_association_new(ep, ep->base.sk, scope, gfp); |
1467 | if (!retval) { |
1468 | *error = -SCTP_IERROR_NOMEM; |
1469 | goto fail; |
1470 | } |
1471 | |
1472 | /* Set up our peer's port number. */ |
1473 | retval->peer.port = ntohs(chunk->sctp_hdr->source); |
1474 | |
1475 | /* Populate the association from the cookie. */ |
1476 | memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); |
1477 | |
1478 | if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, |
1479 | GFP_ATOMIC) < 0) { |
1480 | *error = -SCTP_IERROR_NOMEM; |
1481 | goto fail; |
1482 | } |
1483 | |
1484 | /* Also, add the destination address. */ |
1485 | if (list_empty(&retval->base.bind_addr.address_list)) { |
1486 | sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, |
1487 | GFP_ATOMIC); |
1488 | } |
1489 | |
1490 | retval->next_tsn = retval->c.initial_tsn; |
1491 | retval->ctsn_ack_point = retval->next_tsn - 1; |
1492 | retval->addip_serial = retval->c.initial_tsn; |
1493 | retval->adv_peer_ack_point = retval->ctsn_ack_point; |
1494 | retval->peer.prsctp_capable = retval->c.prsctp_capable; |
1495 | retval->peer.adaption_ind = retval->c.adaption_ind; |
1496 | |
1497 | /* The INIT stuff will be done by the side effects. */ |
1498 | return retval; |
1499 | |
1500 | fail: |
1501 | if (retval) |
1502 | sctp_association_free(retval); |
1503 | |
1504 | return NULL; |
1505 | |
1506 | malformed: |
1507 | /* Yikes! The packet is either corrupt or deliberately |
1508 | * malformed. |
1509 | */ |
1510 | *error = -SCTP_IERROR_MALFORMED; |
1511 | goto fail; |
1512 | } |
1513 | |
1514 | /******************************************************************** |
1515 | * 3rd Level Abstractions |
1516 | ********************************************************************/ |
1517 | |
1518 | struct __sctp_missing { |
1519 | __u32 num_missing; |
1520 | __u16 type; |
1521 | } __attribute__((packed)); |
1522 | |
1523 | /* |
1524 | * Report a missing mandatory parameter. |
1525 | */ |
1526 | static int sctp_process_missing_param(const struct sctp_association *asoc, |
1527 | sctp_param_t paramtype, |
1528 | struct sctp_chunk *chunk, |
1529 | struct sctp_chunk **errp) |
1530 | { |
1531 | struct __sctp_missing report; |
1532 | __u16 len; |
1533 | |
1534 | len = WORD_ROUND(sizeof(report)); |
1535 | |
1536 | /* Make an ERROR chunk, preparing enough room for |
1537 | * returning multiple unknown parameters. |
1538 | */ |
1539 | if (!*errp) |
1540 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
1541 | |
1542 | if (*errp) { |
1543 | report.num_missing = htonl(1); |
1544 | report.type = paramtype; |
1545 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, |
1546 | &report, sizeof(report)); |
1547 | } |
1548 | |
1549 | /* Stop processing this chunk. */ |
1550 | return 0; |
1551 | } |
1552 | |
1553 | /* Report an Invalid Mandatory Parameter. */ |
1554 | static int sctp_process_inv_mandatory(const struct sctp_association *asoc, |
1555 | struct sctp_chunk *chunk, |
1556 | struct sctp_chunk **errp) |
1557 | { |
1558 | /* Invalid Mandatory Parameter Error has no payload. */ |
1559 | |
1560 | if (!*errp) |
1561 | *errp = sctp_make_op_error_space(asoc, chunk, 0); |
1562 | |
1563 | if (*errp) |
1564 | sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0); |
1565 | |
1566 | /* Stop processing this chunk. */ |
1567 | return 0; |
1568 | } |
1569 | |
1570 | static int sctp_process_inv_paramlength(const struct sctp_association *asoc, |
1571 | struct sctp_paramhdr *param, |
1572 | const struct sctp_chunk *chunk, |
1573 | struct sctp_chunk **errp) |
1574 | { |
1575 | char error[] = "The following parameter had invalid length:"; |
1576 | size_t payload_len = WORD_ROUND(sizeof(error)) + |
1577 | sizeof(sctp_paramhdr_t); |
1578 | |
1579 | |
1580 | /* Create an error chunk and fill it in with our payload. */ |
1581 | if (!*errp) |
1582 | *errp = sctp_make_op_error_space(asoc, chunk, payload_len); |
1583 | |
1584 | if (*errp) { |
1585 | sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, error, |
1586 | sizeof(error)); |
1587 | sctp_addto_chunk(*errp, sizeof(sctp_paramhdr_t), param); |
1588 | } |
1589 | |
1590 | return 0; |
1591 | } |
1592 | |
1593 | |
1594 | /* Do not attempt to handle the HOST_NAME parm. However, do |
1595 | * send back an indicator to the peer. |
1596 | */ |
1597 | static int sctp_process_hn_param(const struct sctp_association *asoc, |
1598 | union sctp_params param, |
1599 | struct sctp_chunk *chunk, |
1600 | struct sctp_chunk **errp) |
1601 | { |
1602 | __u16 len = ntohs(param.p->length); |
1603 | |
1604 | /* Make an ERROR chunk. */ |
1605 | if (!*errp) |
1606 | *errp = sctp_make_op_error_space(asoc, chunk, len); |
1607 | |
1608 | if (*errp) |
1609 | sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, |
1610 | param.v, len); |
1611 | |
1612 | /* Stop processing this chunk. */ |
1613 | return 0; |
1614 | } |
1615 | |
1616 | /* RFC 3.2.1 & the Implementers Guide 2.2. |
1617 | * |
1618 | * The Parameter Types are encoded such that the |
1619 | * highest-order two bits specify the action that must be |
1620 | * taken if the processing endpoint does not recognize the |
1621 | * Parameter Type. |
1622 | * |
1623 | * 00 - Stop processing this SCTP chunk and discard it, |
1624 | * do not process any further chunks within it. |
1625 | * |
1626 | * 01 - Stop processing this SCTP chunk and discard it, |
1627 | * do not process any further chunks within it, and report |
1628 | * the unrecognized parameter in an 'Unrecognized |
1629 | * Parameter Type' (in either an ERROR or in the INIT ACK). |
1630 | * |
1631 | * 10 - Skip this parameter and continue processing. |
1632 | * |
1633 | * 11 - Skip this parameter and continue processing but |
1634 | * report the unrecognized parameter in an |
1635 | * 'Unrecognized Parameter Type' (in either an ERROR or in |
1636 | * the INIT ACK). |
1637 | * |
1638 | * Return value: |
1639 | * 0 - discard the chunk |
1640 | * 1 - continue with the chunk |
1641 | */ |
1642 | static int sctp_process_unk_param(const struct sctp_association *asoc, |
1643 | union sctp_params param, |
1644 | struct sctp_chunk *chunk, |
1645 | struct sctp_chunk **errp) |
1646 | { |
1647 | int retval = 1; |
1648 | |
1649 | switch (param.p->type & SCTP_PARAM_ACTION_MASK) { |
1650 | case SCTP_PARAM_ACTION_DISCARD: |
1651 | retval = 0; |
1652 | break; |
1653 | case SCTP_PARAM_ACTION_DISCARD_ERR: |
1654 | retval = 0; |
1655 | /* Make an ERROR chunk, preparing enough room for |
1656 | * returning multiple unknown parameters. |
1657 | */ |
1658 | if (NULL == *errp) |
1659 | *errp = sctp_make_op_error_space(asoc, chunk, |
1660 | ntohs(chunk->chunk_hdr->length)); |
1661 | |
1662 | if (*errp) |
1663 | sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
1664 | param.v, |
1665 | WORD_ROUND(ntohs(param.p->length))); |
1666 | |
1667 | break; |
1668 | case SCTP_PARAM_ACTION_SKIP: |
1669 | break; |
1670 | case SCTP_PARAM_ACTION_SKIP_ERR: |
1671 | /* Make an ERROR chunk, preparing enough room for |
1672 | * returning multiple unknown parameters. |
1673 | */ |
1674 | if (NULL == *errp) |
1675 | *errp = sctp_make_op_error_space(asoc, chunk, |
1676 | ntohs(chunk->chunk_hdr->length)); |
1677 | |
1678 | if (*errp) { |
1679 | sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, |
1680 | param.v, |
1681 | WORD_ROUND(ntohs(param.p->length))); |
1682 | } else { |
1683 | /* If there is no memory for generating the ERROR |
1684 | * report as specified, an ABORT will be triggered |
1685 | * to the peer and the association won't be |
1686 | * established. |
1687 | */ |
1688 | retval = 0; |
1689 | } |
1690 | |
1691 | break; |
1692 | default: |
1693 | break; |
1694 | } |
1695 | |
1696 | return retval; |
1697 | } |
1698 | |
1699 | /* Find unrecognized parameters in the chunk. |
1700 | * Return values: |
1701 | * 0 - discard the chunk |
1702 | * 1 - continue with the chunk |
1703 | */ |
1704 | static int sctp_verify_param(const struct sctp_association *asoc, |
1705 | union sctp_params param, |
1706 | sctp_cid_t cid, |
1707 | struct sctp_chunk *chunk, |
1708 | struct sctp_chunk **err_chunk) |
1709 | { |
1710 | int retval = 1; |
1711 | |
1712 | /* FIXME - This routine is not looking at each parameter per the |
1713 | * chunk type, i.e., unrecognized parameters should be further |
1714 | * identified based on the chunk id. |
1715 | */ |
1716 | |
1717 | switch (param.p->type) { |
1718 | case SCTP_PARAM_IPV4_ADDRESS: |
1719 | case SCTP_PARAM_IPV6_ADDRESS: |
1720 | case SCTP_PARAM_COOKIE_PRESERVATIVE: |
1721 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: |
1722 | case SCTP_PARAM_STATE_COOKIE: |
1723 | case SCTP_PARAM_HEARTBEAT_INFO: |
1724 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: |
1725 | case SCTP_PARAM_ECN_CAPABLE: |
1726 | case SCTP_PARAM_ADAPTION_LAYER_IND: |
1727 | break; |
1728 | |
1729 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
1730 | /* Tell the peer, we won't support this param. */ |
1731 | return sctp_process_hn_param(asoc, param, chunk, err_chunk); |
1732 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
1733 | if (sctp_prsctp_enable) |
1734 | break; |
1735 | /* Fall Through */ |
1736 | default: |
1737 | SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", |
1738 | ntohs(param.p->type), cid); |
1739 | return sctp_process_unk_param(asoc, param, chunk, err_chunk); |
1740 | |
1741 | break; |
1742 | } |
1743 | return retval; |
1744 | } |
1745 | |
1746 | /* Verify the INIT packet before we process it. */ |
1747 | int sctp_verify_init(const struct sctp_association *asoc, |
1748 | sctp_cid_t cid, |
1749 | sctp_init_chunk_t *peer_init, |
1750 | struct sctp_chunk *chunk, |
1751 | struct sctp_chunk **errp) |
1752 | { |
1753 | union sctp_params param; |
1754 | int has_cookie = 0; |
1755 | |
1756 | /* Verify stream values are non-zero. */ |
1757 | if ((0 == peer_init->init_hdr.num_outbound_streams) || |
1758 | (0 == peer_init->init_hdr.num_inbound_streams)) { |
1759 | |
1760 | sctp_process_inv_mandatory(asoc, chunk, errp); |
1761 | return 0; |
1762 | } |
1763 | |
1764 | /* Check for missing mandatory parameters. */ |
1765 | sctp_walk_params(param, peer_init, init_hdr.params) { |
1766 | |
1767 | if (SCTP_PARAM_STATE_COOKIE == param.p->type) |
1768 | has_cookie = 1; |
1769 | |
1770 | } /* for (loop through all parameters) */ |
1771 | |
1772 | /* There is a possibility that a parameter length was bad and |
1773 | * in that case we would have stoped walking the parameters. |
1774 | * The current param.p would point at the bad one. |
1775 | * Current consensus on the mailing list is to generate a PROTOCOL |
1776 | * VIOLATION error. We build the ERROR chunk here and let the normal |
1777 | * error handling code build and send the packet. |
1778 | */ |
1779 | if (param.v < (void*)chunk->chunk_end - sizeof(sctp_paramhdr_t)) { |
1780 | sctp_process_inv_paramlength(asoc, param.p, chunk, errp); |
1781 | return 0; |
1782 | } |
1783 | |
1784 | /* The only missing mandatory param possible today is |
1785 | * the state cookie for an INIT-ACK chunk. |
1786 | */ |
1787 | if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) { |
1788 | sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, |
1789 | chunk, errp); |
1790 | return 0; |
1791 | } |
1792 | |
1793 | /* Find unrecognized parameters. */ |
1794 | |
1795 | sctp_walk_params(param, peer_init, init_hdr.params) { |
1796 | |
1797 | if (!sctp_verify_param(asoc, param, cid, chunk, errp)) { |
1798 | if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type) |
1799 | return 0; |
1800 | else |
1801 | return 1; |
1802 | } |
1803 | |
1804 | } /* for (loop through all parameters) */ |
1805 | |
1806 | return 1; |
1807 | } |
1808 | |
1809 | /* Unpack the parameters in an INIT packet into an association. |
1810 | * Returns 0 on failure, else success. |
1811 | * FIXME: This is an association method. |
1812 | */ |
1813 | int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, |
1814 | const union sctp_addr *peer_addr, |
1815 | sctp_init_chunk_t *peer_init, int gfp) |
1816 | { |
1817 | union sctp_params param; |
1818 | struct sctp_transport *transport; |
1819 | struct list_head *pos, *temp; |
1820 | char *cookie; |
1821 | |
1822 | /* We must include the address that the INIT packet came from. |
1823 | * This is the only address that matters for an INIT packet. |
1824 | * When processing a COOKIE ECHO, we retrieve the from address |
1825 | * of the INIT from the cookie. |
1826 | */ |
1827 | |
1828 | /* This implementation defaults to making the first transport |
1829 | * added as the primary transport. The source address seems to |
1830 | * be a a better choice than any of the embedded addresses. |
1831 | */ |
1832 | if (peer_addr) |
1833 | if(!sctp_assoc_add_peer(asoc, peer_addr, gfp)) |
1834 | goto nomem; |
1835 | |
1836 | /* Process the initialization parameters. */ |
1837 | |
1838 | sctp_walk_params(param, peer_init, init_hdr.params) { |
1839 | |
1840 | if (!sctp_process_param(asoc, param, peer_addr, gfp)) |
1841 | goto clean_up; |
1842 | } |
1843 | |
1844 | /* The fixed INIT headers are always in network byte |
1845 | * order. |
1846 | */ |
1847 | asoc->peer.i.init_tag = |
1848 | ntohl(peer_init->init_hdr.init_tag); |
1849 | asoc->peer.i.a_rwnd = |
1850 | ntohl(peer_init->init_hdr.a_rwnd); |
1851 | asoc->peer.i.num_outbound_streams = |
1852 | ntohs(peer_init->init_hdr.num_outbound_streams); |
1853 | asoc->peer.i.num_inbound_streams = |
1854 | ntohs(peer_init->init_hdr.num_inbound_streams); |
1855 | asoc->peer.i.initial_tsn = |
1856 | ntohl(peer_init->init_hdr.initial_tsn); |
1857 | |
1858 | /* Apply the upper bounds for output streams based on peer's |
1859 | * number of inbound streams. |
1860 | */ |
1861 | if (asoc->c.sinit_num_ostreams > |
1862 | ntohs(peer_init->init_hdr.num_inbound_streams)) { |
1863 | asoc->c.sinit_num_ostreams = |
1864 | ntohs(peer_init->init_hdr.num_inbound_streams); |
1865 | } |
1866 | |
1867 | if (asoc->c.sinit_max_instreams > |
1868 | ntohs(peer_init->init_hdr.num_outbound_streams)) { |
1869 | asoc->c.sinit_max_instreams = |
1870 | ntohs(peer_init->init_hdr.num_outbound_streams); |
1871 | } |
1872 | |
1873 | /* Copy Initiation tag from INIT to VT_peer in cookie. */ |
1874 | asoc->c.peer_vtag = asoc->peer.i.init_tag; |
1875 | |
1876 | /* Peer Rwnd : Current calculated value of the peer's rwnd. */ |
1877 | asoc->peer.rwnd = asoc->peer.i.a_rwnd; |
1878 | |
1879 | /* Copy cookie in case we need to resend COOKIE-ECHO. */ |
1880 | cookie = asoc->peer.cookie; |
1881 | if (cookie) { |
1882 | asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp); |
1883 | if (!asoc->peer.cookie) |
1884 | goto clean_up; |
1885 | memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len); |
1886 | } |
1887 | |
1888 | /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily |
1889 | * high (for example, implementations MAY use the size of the receiver |
1890 | * advertised window). |
1891 | */ |
1892 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
1893 | transport = list_entry(pos, struct sctp_transport, transports); |
1894 | transport->ssthresh = asoc->peer.i.a_rwnd; |
1895 | } |
1896 | |
1897 | /* Set up the TSN tracking pieces. */ |
1898 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, |
1899 | asoc->peer.i.initial_tsn); |
1900 | |
1901 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number |
1902 | * |
1903 | * The stream sequence number in all the streams shall start |
1904 | * from 0 when the association is established. Also, when the |
1905 | * stream sequence number reaches the value 65535 the next |
1906 | * stream sequence number shall be set to 0. |
1907 | */ |
1908 | |
1909 | /* Allocate storage for the negotiated streams if it is not a temporary * association. |
1910 | */ |
1911 | if (!asoc->temp) { |
1912 | int assoc_id; |
1913 | int error; |
1914 | |
1915 | asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, |
1916 | asoc->c.sinit_num_ostreams, gfp); |
1917 | if (!asoc->ssnmap) |
1918 | goto clean_up; |
1919 | |
1920 | retry: |
1921 | if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) |
1922 | goto clean_up; |
1923 | spin_lock_bh(&sctp_assocs_id_lock); |
1924 | error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, 1, |
1925 | &assoc_id); |
1926 | spin_unlock_bh(&sctp_assocs_id_lock); |
1927 | if (error == -EAGAIN) |
1928 | goto retry; |
1929 | else if (error) |
1930 | goto clean_up; |
1931 | |
1932 | asoc->assoc_id = (sctp_assoc_t) assoc_id; |
1933 | } |
1934 | |
1935 | /* ADDIP Section 4.1 ASCONF Chunk Procedures |
1936 | * |
1937 | * When an endpoint has an ASCONF signaled change to be sent to the |
1938 | * remote endpoint it should do the following: |
1939 | * ... |
1940 | * A2) A serial number should be assigned to the Chunk. The serial |
1941 | * number should be a monotonically increasing number. All serial |
1942 | * numbers are defined to be initialized at the start of the |
1943 | * association to the same value as the Initial TSN. |
1944 | */ |
1945 | asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; |
1946 | return 1; |
1947 | |
1948 | clean_up: |
1949 | /* Release the transport structures. */ |
1950 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
1951 | transport = list_entry(pos, struct sctp_transport, transports); |
1952 | list_del_init(pos); |
1953 | sctp_transport_free(transport); |
1954 | } |
1955 | nomem: |
1956 | return 0; |
1957 | } |
1958 | |
1959 | |
1960 | /* Update asoc with the option described in param. |
1961 | * |
1962 | * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT |
1963 | * |
1964 | * asoc is the association to update. |
1965 | * param is the variable length parameter to use for update. |
1966 | * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. |
1967 | * If the current packet is an INIT we want to minimize the amount of |
1968 | * work we do. In particular, we should not build transport |
1969 | * structures for the addresses. |
1970 | */ |
1971 | static int sctp_process_param(struct sctp_association *asoc, |
1972 | union sctp_params param, |
1973 | const union sctp_addr *peer_addr, |
1974 | int gfp) |
1975 | { |
1976 | union sctp_addr addr; |
1977 | int i; |
1978 | __u16 sat; |
1979 | int retval = 1; |
1980 | sctp_scope_t scope; |
1981 | time_t stale; |
1982 | struct sctp_af *af; |
1983 | |
1984 | /* We maintain all INIT parameters in network byte order all the |
1985 | * time. This allows us to not worry about whether the parameters |
1986 | * came from a fresh INIT, and INIT ACK, or were stored in a cookie. |
1987 | */ |
1988 | switch (param.p->type) { |
1989 | case SCTP_PARAM_IPV6_ADDRESS: |
1990 | if (PF_INET6 != asoc->base.sk->sk_family) |
1991 | break; |
1992 | /* Fall through. */ |
1993 | case SCTP_PARAM_IPV4_ADDRESS: |
1994 | af = sctp_get_af_specific(param_type2af(param.p->type)); |
1995 | af->from_addr_param(&addr, param.addr, asoc->peer.port, 0); |
1996 | scope = sctp_scope(peer_addr); |
1997 | if (sctp_in_scope(&addr, scope)) |
1998 | if (!sctp_assoc_add_peer(asoc, &addr, gfp)) |
1999 | return 0; |
2000 | break; |
2001 | |
2002 | case SCTP_PARAM_COOKIE_PRESERVATIVE: |
2003 | if (!sctp_cookie_preserve_enable) |
2004 | break; |
2005 | |
2006 | stale = ntohl(param.life->lifespan_increment); |
2007 | |
2008 | /* Suggested Cookie Life span increment's unit is msec, |
2009 | * (1/1000sec). |
2010 | */ |
2011 | asoc->cookie_life.tv_sec += stale / 1000; |
2012 | asoc->cookie_life.tv_usec += (stale % 1000) * 1000; |
2013 | break; |
2014 | |
2015 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2016 | SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); |
2017 | break; |
2018 | |
2019 | case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: |
2020 | /* Turn off the default values first so we'll know which |
2021 | * ones are really set by the peer. |
2022 | */ |
2023 | asoc->peer.ipv4_address = 0; |
2024 | asoc->peer.ipv6_address = 0; |
2025 | |
2026 | /* Cycle through address types; avoid divide by 0. */ |
2027 | sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
2028 | if (sat) |
2029 | sat /= sizeof(__u16); |
2030 | |
2031 | for (i = 0; i < sat; ++i) { |
2032 | switch (param.sat->types[i]) { |
2033 | case SCTP_PARAM_IPV4_ADDRESS: |
2034 | asoc->peer.ipv4_address = 1; |
2035 | break; |
2036 | |
2037 | case SCTP_PARAM_IPV6_ADDRESS: |
2038 | asoc->peer.ipv6_address = 1; |
2039 | break; |
2040 | |
2041 | case SCTP_PARAM_HOST_NAME_ADDRESS: |
2042 | asoc->peer.hostname_address = 1; |
2043 | break; |
2044 | |
2045 | default: /* Just ignore anything else. */ |
2046 | break; |
2047 | }; |
2048 | } |
2049 | break; |
2050 | |
2051 | case SCTP_PARAM_STATE_COOKIE: |
2052 | asoc->peer.cookie_len = |
2053 | ntohs(param.p->length) - sizeof(sctp_paramhdr_t); |
2054 | asoc->peer.cookie = param.cookie->body; |
2055 | break; |
2056 | |
2057 | case SCTP_PARAM_HEARTBEAT_INFO: |
2058 | /* Would be odd to receive, but it causes no problems. */ |
2059 | break; |
2060 | |
2061 | case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: |
2062 | /* Rejected during verify stage. */ |
2063 | break; |
2064 | |
2065 | case SCTP_PARAM_ECN_CAPABLE: |
2066 | asoc->peer.ecn_capable = 1; |
2067 | break; |
2068 | |
2069 | case SCTP_PARAM_ADAPTION_LAYER_IND: |
2070 | asoc->peer.adaption_ind = param.aind->adaption_ind; |
2071 | break; |
2072 | |
2073 | case SCTP_PARAM_FWD_TSN_SUPPORT: |
2074 | if (sctp_prsctp_enable) { |
2075 | asoc->peer.prsctp_capable = 1; |
2076 | break; |
2077 | } |
2078 | /* Fall Through */ |
2079 | default: |
2080 | /* Any unrecognized parameters should have been caught |
2081 | * and handled by sctp_verify_param() which should be |
2082 | * called prior to this routine. Simply log the error |
2083 | * here. |
2084 | */ |
2085 | SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", |
2086 | ntohs(param.p->type), asoc); |
2087 | break; |
2088 | }; |
2089 | |
2090 | return retval; |
2091 | } |
2092 | |
2093 | /* Select a new verification tag. */ |
2094 | __u32 sctp_generate_tag(const struct sctp_endpoint *ep) |
2095 | { |
2096 | /* I believe that this random number generator complies with RFC1750. |
2097 | * A tag of 0 is reserved for special cases (e.g. INIT). |
2098 | */ |
2099 | __u32 x; |
2100 | |
2101 | do { |
2102 | get_random_bytes(&x, sizeof(__u32)); |
2103 | } while (x == 0); |
2104 | |
2105 | return x; |
2106 | } |
2107 | |
2108 | /* Select an initial TSN to send during startup. */ |
2109 | __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) |
2110 | { |
2111 | __u32 retval; |
2112 | |
2113 | get_random_bytes(&retval, sizeof(__u32)); |
2114 | return retval; |
2115 | } |
2116 | |
2117 | /* |
2118 | * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) |
2119 | * 0 1 2 3 |
2120 | * 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 |
2121 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2122 | * | Type = 0xC1 | Chunk Flags | Chunk Length | |
2123 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2124 | * | Serial Number | |
2125 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2126 | * | Address Parameter | |
2127 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2128 | * | ASCONF Parameter #1 | |
2129 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2130 | * \ \ |
2131 | * / .... / |
2132 | * \ \ |
2133 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2134 | * | ASCONF Parameter #N | |
2135 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2136 | * |
2137 | * Address Parameter and other parameter will not be wrapped in this function |
2138 | */ |
2139 | static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, |
2140 | union sctp_addr *addr, |
2141 | int vparam_len) |
2142 | { |
2143 | sctp_addiphdr_t asconf; |
2144 | struct sctp_chunk *retval; |
2145 | int length = sizeof(asconf) + vparam_len; |
2146 | union sctp_addr_param addrparam; |
2147 | int addrlen; |
2148 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2149 | |
2150 | addrlen = af->to_addr_param(addr, &addrparam); |
2151 | if (!addrlen) |
2152 | return NULL; |
2153 | length += addrlen; |
2154 | |
2155 | /* Create the chunk. */ |
2156 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); |
2157 | if (!retval) |
2158 | return NULL; |
2159 | |
2160 | asconf.serial = htonl(asoc->addip_serial++); |
2161 | |
2162 | retval->subh.addip_hdr = |
2163 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); |
2164 | retval->param_hdr.v = |
2165 | sctp_addto_chunk(retval, addrlen, &addrparam); |
2166 | |
2167 | return retval; |
2168 | } |
2169 | |
2170 | /* ADDIP |
2171 | * 3.2.1 Add IP Address |
2172 | * 0 1 2 3 |
2173 | * 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 |
2174 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2175 | * | Type = 0xC001 | Length = Variable | |
2176 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2177 | * | ASCONF-Request Correlation ID | |
2178 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2179 | * | Address Parameter | |
2180 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2181 | * |
2182 | * 3.2.2 Delete IP Address |
2183 | * 0 1 2 3 |
2184 | * 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 |
2185 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2186 | * | Type = 0xC002 | Length = Variable | |
2187 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2188 | * | ASCONF-Request Correlation ID | |
2189 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2190 | * | Address Parameter | |
2191 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2192 | * |
2193 | */ |
2194 | struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, |
2195 | union sctp_addr *laddr, |
2196 | struct sockaddr *addrs, |
2197 | int addrcnt, |
2198 | __u16 flags) |
2199 | { |
2200 | sctp_addip_param_t param; |
2201 | struct sctp_chunk *retval; |
2202 | union sctp_addr_param addr_param; |
2203 | union sctp_addr *addr; |
2204 | void *addr_buf; |
2205 | struct sctp_af *af; |
2206 | int paramlen = sizeof(param); |
2207 | int addr_param_len = 0; |
2208 | int totallen = 0; |
2209 | int i; |
2210 | |
2211 | /* Get total length of all the address parameters. */ |
2212 | addr_buf = addrs; |
2213 | for (i = 0; i < addrcnt; i++) { |
2214 | addr = (union sctp_addr *)addr_buf; |
2215 | af = sctp_get_af_specific(addr->v4.sin_family); |
2216 | addr_param_len = af->to_addr_param(addr, &addr_param); |
2217 | |
2218 | totallen += paramlen; |
2219 | totallen += addr_param_len; |
2220 | |
2221 | addr_buf += af->sockaddr_len; |
2222 | } |
2223 | |
2224 | /* Create an asconf chunk with the required length. */ |
2225 | retval = sctp_make_asconf(asoc, laddr, totallen); |
2226 | if (!retval) |
2227 | return NULL; |
2228 | |
2229 | /* Add the address parameters to the asconf chunk. */ |
2230 | addr_buf = addrs; |
2231 | for (i = 0; i < addrcnt; i++) { |
2232 | addr = (union sctp_addr *)addr_buf; |
2233 | af = sctp_get_af_specific(addr->v4.sin_family); |
2234 | addr_param_len = af->to_addr_param(addr, &addr_param); |
2235 | param.param_hdr.type = flags; |
2236 | param.param_hdr.length = htons(paramlen + addr_param_len); |
2237 | param.crr_id = i; |
2238 | |
2239 | sctp_addto_chunk(retval, paramlen, ¶m); |
2240 | sctp_addto_chunk(retval, addr_param_len, &addr_param); |
2241 | |
2242 | addr_buf += af->sockaddr_len; |
2243 | } |
2244 | return retval; |
2245 | } |
2246 | |
2247 | /* ADDIP |
2248 | * 3.2.4 Set Primary IP Address |
2249 | * 0 1 2 3 |
2250 | * 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 |
2251 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2252 | * | Type =0xC004 | Length = Variable | |
2253 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2254 | * | ASCONF-Request Correlation ID | |
2255 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2256 | * | Address Parameter | |
2257 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2258 | * |
2259 | * Create an ASCONF chunk with Set Primary IP address parameter. |
2260 | */ |
2261 | struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, |
2262 | union sctp_addr *addr) |
2263 | { |
2264 | sctp_addip_param_t param; |
2265 | struct sctp_chunk *retval; |
2266 | int len = sizeof(param); |
2267 | union sctp_addr_param addrparam; |
2268 | int addrlen; |
2269 | struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); |
2270 | |
2271 | addrlen = af->to_addr_param(addr, &addrparam); |
2272 | if (!addrlen) |
2273 | return NULL; |
2274 | len += addrlen; |
2275 | |
2276 | /* Create the chunk and make asconf header. */ |
2277 | retval = sctp_make_asconf(asoc, addr, len); |
2278 | if (!retval) |
2279 | return NULL; |
2280 | |
2281 | param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; |
2282 | param.param_hdr.length = htons(len); |
2283 | param.crr_id = 0; |
2284 | |
2285 | sctp_addto_chunk(retval, sizeof(param), ¶m); |
2286 | sctp_addto_chunk(retval, addrlen, &addrparam); |
2287 | |
2288 | return retval; |
2289 | } |
2290 | |
2291 | /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) |
2292 | * 0 1 2 3 |
2293 | * 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 |
2294 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2295 | * | Type = 0x80 | Chunk Flags | Chunk Length | |
2296 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2297 | * | Serial Number | |
2298 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2299 | * | ASCONF Parameter Response#1 | |
2300 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2301 | * \ \ |
2302 | * / .... / |
2303 | * \ \ |
2304 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2305 | * | ASCONF Parameter Response#N | |
2306 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
2307 | * |
2308 | * Create an ASCONF_ACK chunk with enough space for the parameter responses. |
2309 | */ |
2310 | static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, |
2311 | __u32 serial, int vparam_len) |
2312 | { |
2313 | sctp_addiphdr_t asconf; |
2314 | struct sctp_chunk *retval; |
2315 | int length = sizeof(asconf) + vparam_len; |
2316 | |
2317 | /* Create the chunk. */ |
2318 | retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); |
2319 | if (!retval) |
2320 | return NULL; |
2321 | |
2322 | asconf.serial = htonl(serial); |
2323 | |
2324 | retval->subh.addip_hdr = |
2325 | sctp_addto_chunk(retval, sizeof(asconf), &asconf); |
2326 | |
2327 | return retval; |
2328 | } |
2329 | |
2330 | /* Add response parameters to an ASCONF_ACK chunk. */ |
2331 | static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id, |
2332 | __u16 err_code, sctp_addip_param_t *asconf_param) |
2333 | { |
2334 | sctp_addip_param_t ack_param; |
2335 | sctp_errhdr_t err_param; |
2336 | int asconf_param_len = 0; |
2337 | int err_param_len = 0; |
2338 | __u16 response_type; |
2339 | |
2340 | if (SCTP_ERROR_NO_ERROR == err_code) { |
2341 | response_type = SCTP_PARAM_SUCCESS_REPORT; |
2342 | } else { |
2343 | response_type = SCTP_PARAM_ERR_CAUSE; |
2344 | err_param_len = sizeof(err_param); |
2345 | if (asconf_param) |
2346 | asconf_param_len = |
2347 | ntohs(asconf_param->param_hdr.length); |
2348 | } |
2349 | |
2350 | /* Add Success Indication or Error Cause Indication parameter. */ |
2351 | ack_param.param_hdr.type = response_type; |
2352 | ack_param.param_hdr.length = htons(sizeof(ack_param) + |
2353 | err_param_len + |
2354 | asconf_param_len); |
2355 | ack_param.crr_id = crr_id; |
2356 | sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); |
2357 | |
2358 | if (SCTP_ERROR_NO_ERROR == err_code) |
2359 | return; |
2360 | |
2361 | /* Add Error Cause parameter. */ |
2362 | err_param.cause = err_code; |
2363 | err_param.length = htons(err_param_len + asconf_param_len); |
2364 | sctp_addto_chunk(chunk, err_param_len, &err_param); |
2365 | |
2366 | /* Add the failed TLV copied from ASCONF chunk. */ |
2367 | if (asconf_param) |
2368 | sctp_addto_chunk(chunk, asconf_param_len, asconf_param); |
2369 | } |
2370 | |
2371 | /* Process a asconf parameter. */ |
2372 | static __u16 sctp_process_asconf_param(struct sctp_association *asoc, |
2373 | struct sctp_chunk *asconf, |
2374 | sctp_addip_param_t *asconf_param) |
2375 | { |
2376 | struct sctp_transport *peer; |
2377 | struct sctp_af *af; |
2378 | union sctp_addr addr; |
2379 | struct list_head *pos; |
2380 | union sctp_addr_param *addr_param; |
2381 | |
2382 | addr_param = (union sctp_addr_param *) |
2383 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); |
2384 | |
2385 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); |
2386 | if (unlikely(!af)) |
2387 | return SCTP_ERROR_INV_PARAM; |
2388 | |
2389 | af->from_addr_param(&addr, addr_param, asoc->peer.port, 0); |
2390 | switch (asconf_param->param_hdr.type) { |
2391 | case SCTP_PARAM_ADD_IP: |
2392 | /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address |
2393 | * request and does not have the local resources to add this |
2394 | * new address to the association, it MUST return an Error |
2395 | * Cause TLV set to the new error code 'Operation Refused |
2396 | * Due to Resource Shortage'. |
2397 | */ |
2398 | |
2399 | peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC); |
2400 | if (!peer) |
2401 | return SCTP_ERROR_RSRC_LOW; |
2402 | |
2403 | /* Start the heartbeat timer. */ |
2404 | if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) |
2405 | sctp_transport_hold(peer); |
2406 | break; |
2407 | case SCTP_PARAM_DEL_IP: |
2408 | /* ADDIP 4.3 D7) If a request is received to delete the |
2409 | * last remaining IP address of a peer endpoint, the receiver |
2410 | * MUST send an Error Cause TLV with the error cause set to the |
2411 | * new error code 'Request to Delete Last Remaining IP Address'. |
2412 | */ |
2413 | pos = asoc->peer.transport_addr_list.next; |
2414 | if (pos->next == &asoc->peer.transport_addr_list) |
2415 | return SCTP_ERROR_DEL_LAST_IP; |
2416 | |
2417 | /* ADDIP 4.3 D8) If a request is received to delete an IP |
2418 | * address which is also the source address of the IP packet |
2419 | * which contained the ASCONF chunk, the receiver MUST reject |
2420 | * this request. To reject the request the receiver MUST send |
2421 | * an Error Cause TLV set to the new error code 'Request to |
2422 | * Delete Source IP Address' |
2423 | */ |
2424 | if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) |
2425 | return SCTP_ERROR_DEL_SRC_IP; |
2426 | |
2427 | sctp_assoc_del_peer(asoc, &addr); |
2428 | break; |
2429 | case SCTP_PARAM_SET_PRIMARY: |
2430 | peer = sctp_assoc_lookup_paddr(asoc, &addr); |
2431 | if (!peer) |
2432 | return SCTP_ERROR_INV_PARAM; |
2433 | |
2434 | sctp_assoc_set_primary(asoc, peer); |
2435 | break; |
2436 | default: |
2437 | return SCTP_ERROR_INV_PARAM; |
2438 | break; |
2439 | } |
2440 | |
2441 | return SCTP_ERROR_NO_ERROR; |
2442 | } |
2443 | |
2444 | /* Process an incoming ASCONF chunk with the next expected serial no. and |
2445 | * return an ASCONF_ACK chunk to be sent in response. |
2446 | */ |
2447 | struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, |
2448 | struct sctp_chunk *asconf) |
2449 | { |
2450 | sctp_addiphdr_t *hdr; |
2451 | union sctp_addr_param *addr_param; |
2452 | sctp_addip_param_t *asconf_param; |
2453 | struct sctp_chunk *asconf_ack; |
2454 | |
2455 | __u16 err_code; |
2456 | int length = 0; |
2457 | int chunk_len = asconf->skb->len; |
2458 | __u32 serial; |
2459 | int all_param_pass = 1; |
2460 | |
2461 | hdr = (sctp_addiphdr_t *)asconf->skb->data; |
2462 | serial = ntohl(hdr->serial); |
2463 | |
2464 | /* Skip the addiphdr and store a pointer to address parameter. */ |
2465 | length = sizeof(sctp_addiphdr_t); |
2466 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
2467 | chunk_len -= length; |
2468 | |
2469 | /* Skip the address parameter and store a pointer to the first |
2470 | * asconf paramter. |
2471 | */ |
2472 | length = ntohs(addr_param->v4.param_hdr.length); |
2473 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); |
2474 | chunk_len -= length; |
2475 | |
2476 | /* create an ASCONF_ACK chunk. |
2477 | * Based on the definitions of parameters, we know that the size of |
2478 | * ASCONF_ACK parameters are less than or equal to the twice of ASCONF |
2479 | * paramters. |
2480 | */ |
2481 | asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); |
2482 | if (!asconf_ack) |
2483 | goto done; |
2484 | |
2485 | /* Process the TLVs contained within the ASCONF chunk. */ |
2486 | while (chunk_len > 0) { |
2487 | err_code = sctp_process_asconf_param(asoc, asconf, |
2488 | asconf_param); |
2489 | /* ADDIP 4.1 A7) |
2490 | * If an error response is received for a TLV parameter, |
2491 | * all TLVs with no response before the failed TLV are |
2492 | * considered successful if not reported. All TLVs after |
2493 | * the failed response are considered unsuccessful unless |
2494 | * a specific success indication is present for the parameter. |
2495 | */ |
2496 | if (SCTP_ERROR_NO_ERROR != err_code) |
2497 | all_param_pass = 0; |
2498 | |
2499 | if (!all_param_pass) |
2500 | sctp_add_asconf_response(asconf_ack, |
2501 | asconf_param->crr_id, err_code, |
2502 | asconf_param); |
2503 | |
2504 | /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add |
2505 | * an IP address sends an 'Out of Resource' in its response, it |
2506 | * MUST also fail any subsequent add or delete requests bundled |
2507 | * in the ASCONF. |
2508 | */ |
2509 | if (SCTP_ERROR_RSRC_LOW == err_code) |
2510 | goto done; |
2511 | |
2512 | /* Move to the next ASCONF param. */ |
2513 | length = ntohs(asconf_param->param_hdr.length); |
2514 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + |
2515 | length); |
2516 | chunk_len -= length; |
2517 | } |
2518 | |
2519 | done: |
2520 | asoc->peer.addip_serial++; |
2521 | |
2522 | /* If we are sending a new ASCONF_ACK hold a reference to it in assoc |
2523 | * after freeing the reference to old asconf ack if any. |
2524 | */ |
2525 | if (asconf_ack) { |
2526 | if (asoc->addip_last_asconf_ack) |
2527 | sctp_chunk_free(asoc->addip_last_asconf_ack); |
2528 | |
2529 | sctp_chunk_hold(asconf_ack); |
2530 | asoc->addip_last_asconf_ack = asconf_ack; |
2531 | } |
2532 | |
2533 | return asconf_ack; |
2534 | } |
2535 | |
2536 | /* Process a asconf parameter that is successfully acked. */ |
2537 | static int sctp_asconf_param_success(struct sctp_association *asoc, |
2538 | sctp_addip_param_t *asconf_param) |
2539 | { |
2540 | struct sctp_af *af; |
2541 | union sctp_addr addr; |
2542 | struct sctp_bind_addr *bp = &asoc->base.bind_addr; |
2543 | union sctp_addr_param *addr_param; |
2544 | struct list_head *pos; |
2545 | struct sctp_transport *transport; |
2546 | int retval = 0; |
2547 | |
2548 | addr_param = (union sctp_addr_param *) |
2549 | ((void *)asconf_param + sizeof(sctp_addip_param_t)); |
2550 | |
2551 | /* We have checked the packet before, so we do not check again. */ |
2552 | af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); |
2553 | af->from_addr_param(&addr, addr_param, bp->port, 0); |
2554 | |
2555 | switch (asconf_param->param_hdr.type) { |
2556 | case SCTP_PARAM_ADD_IP: |
2557 | sctp_local_bh_disable(); |
2558 | sctp_write_lock(&asoc->base.addr_lock); |
2559 | retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC); |
2560 | sctp_write_unlock(&asoc->base.addr_lock); |
2561 | sctp_local_bh_enable(); |
2562 | break; |
2563 | case SCTP_PARAM_DEL_IP: |
2564 | sctp_local_bh_disable(); |
2565 | sctp_write_lock(&asoc->base.addr_lock); |
2566 | retval = sctp_del_bind_addr(bp, &addr); |
2567 | sctp_write_unlock(&asoc->base.addr_lock); |
2568 | sctp_local_bh_enable(); |
2569 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
2570 | transport = list_entry(pos, struct sctp_transport, |
2571 | transports); |
2572 | sctp_transport_route(transport, NULL, |
2573 | sctp_sk(asoc->base.sk)); |
2574 | } |
2575 | break; |
2576 | default: |
2577 | break; |
2578 | } |
2579 | |
2580 | return retval; |
2581 | } |
2582 | |
2583 | /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk |
2584 | * for the given asconf parameter. If there is no response for this parameter, |
2585 | * return the error code based on the third argument 'no_err'. |
2586 | * ADDIP 4.1 |
2587 | * A7) If an error response is received for a TLV parameter, all TLVs with no |
2588 | * response before the failed TLV are considered successful if not reported. |
2589 | * All TLVs after the failed response are considered unsuccessful unless a |
2590 | * specific success indication is present for the parameter. |
2591 | */ |
2592 | static __u16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, |
2593 | sctp_addip_param_t *asconf_param, |
2594 | int no_err) |
2595 | { |
2596 | sctp_addip_param_t *asconf_ack_param; |
2597 | sctp_errhdr_t *err_param; |
2598 | int length; |
2599 | int asconf_ack_len = asconf_ack->skb->len; |
2600 | __u16 err_code; |
2601 | |
2602 | if (no_err) |
2603 | err_code = SCTP_ERROR_NO_ERROR; |
2604 | else |
2605 | err_code = SCTP_ERROR_REQ_REFUSED; |
2606 | |
2607 | /* Skip the addiphdr from the asconf_ack chunk and store a pointer to |
2608 | * the first asconf_ack parameter. |
2609 | */ |
2610 | length = sizeof(sctp_addiphdr_t); |
2611 | asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + |
2612 | length); |
2613 | asconf_ack_len -= length; |
2614 | |
2615 | while (asconf_ack_len > 0) { |
2616 | if (asconf_ack_param->crr_id == asconf_param->crr_id) { |
2617 | switch(asconf_ack_param->param_hdr.type) { |
2618 | case SCTP_PARAM_SUCCESS_REPORT: |
2619 | return SCTP_ERROR_NO_ERROR; |
2620 | case SCTP_PARAM_ERR_CAUSE: |
2621 | length = sizeof(sctp_addip_param_t); |
2622 | err_param = (sctp_errhdr_t *) |
2623 | ((void *)asconf_ack_param + length); |
2624 | asconf_ack_len -= length; |
2625 | if (asconf_ack_len > 0) |
2626 | return err_param->cause; |
2627 | else |
2628 | return SCTP_ERROR_INV_PARAM; |
2629 | break; |
2630 | default: |
2631 | return SCTP_ERROR_INV_PARAM; |
2632 | } |
2633 | } |
2634 | |
2635 | length = ntohs(asconf_ack_param->param_hdr.length); |
2636 | asconf_ack_param = (sctp_addip_param_t *) |
2637 | ((void *)asconf_ack_param + length); |
2638 | asconf_ack_len -= length; |
2639 | } |
2640 | |
2641 | return err_code; |
2642 | } |
2643 | |
2644 | /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ |
2645 | int sctp_process_asconf_ack(struct sctp_association *asoc, |
2646 | struct sctp_chunk *asconf_ack) |
2647 | { |
2648 | struct sctp_chunk *asconf = asoc->addip_last_asconf; |
2649 | union sctp_addr_param *addr_param; |
2650 | sctp_addip_param_t *asconf_param; |
2651 | int length = 0; |
2652 | int asconf_len = asconf->skb->len; |
2653 | int all_param_pass = 0; |
2654 | int no_err = 1; |
2655 | int retval = 0; |
2656 | __u16 err_code = SCTP_ERROR_NO_ERROR; |
2657 | |
2658 | /* Skip the chunkhdr and addiphdr from the last asconf sent and store |
2659 | * a pointer to address parameter. |
2660 | */ |
2661 | length = sizeof(sctp_addip_chunk_t); |
2662 | addr_param = (union sctp_addr_param *)(asconf->skb->data + length); |
2663 | asconf_len -= length; |
2664 | |
2665 | /* Skip the address parameter in the last asconf sent and store a |
2666 | * pointer to the first asconf paramter. |
2667 | */ |
2668 | length = ntohs(addr_param->v4.param_hdr.length); |
2669 | asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); |
2670 | asconf_len -= length; |
2671 | |
2672 | /* ADDIP 4.1 |
2673 | * A8) If there is no response(s) to specific TLV parameter(s), and no |
2674 | * failures are indicated, then all request(s) are considered |
2675 | * successful. |
2676 | */ |
2677 | if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) |
2678 | all_param_pass = 1; |
2679 | |
2680 | /* Process the TLVs contained in the last sent ASCONF chunk. */ |
2681 | while (asconf_len > 0) { |
2682 | if (all_param_pass) |
2683 | err_code = SCTP_ERROR_NO_ERROR; |
2684 | else { |
2685 | err_code = sctp_get_asconf_response(asconf_ack, |
2686 | asconf_param, |
2687 | no_err); |
2688 | if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) |
2689 | no_err = 0; |
2690 | } |
2691 | |
2692 | switch (err_code) { |
2693 | case SCTP_ERROR_NO_ERROR: |
2694 | retval = sctp_asconf_param_success(asoc, asconf_param); |
2695 | break; |
2696 | |
2697 | case SCTP_ERROR_RSRC_LOW: |
2698 | retval = 1; |
2699 | break; |
2700 | |
2701 | case SCTP_ERROR_INV_PARAM: |
2702 | /* Disable sending this type of asconf parameter in |
2703 | * future. |
2704 | */ |
2705 | asoc->peer.addip_disabled_mask |= |
2706 | asconf_param->param_hdr.type; |
2707 | break; |
2708 | |
2709 | case SCTP_ERROR_REQ_REFUSED: |
2710 | case SCTP_ERROR_DEL_LAST_IP: |
2711 | case SCTP_ERROR_DEL_SRC_IP: |
2712 | default: |
2713 | break; |
2714 | } |
2715 | |
2716 | /* Skip the processed asconf parameter and move to the next |
2717 | * one. |
2718 | */ |
2719 | length = ntohs(asconf_param->param_hdr.length); |
2720 | asconf_param = (sctp_addip_param_t *)((void *)asconf_param + |
2721 | length); |
2722 | asconf_len -= length; |
2723 | } |
2724 | |
2725 | /* Free the cached last sent asconf chunk. */ |
2726 | sctp_chunk_free(asconf); |
2727 | asoc->addip_last_asconf = NULL; |
2728 | |
2729 | /* Send the next asconf chunk from the addip chunk queue. */ |
2730 | asconf = (struct sctp_chunk *)__skb_dequeue(&asoc->addip_chunks); |
2731 | if (asconf) { |
2732 | /* Hold the chunk until an ASCONF_ACK is received. */ |
2733 | sctp_chunk_hold(asconf); |
2734 | if (sctp_primitive_ASCONF(asoc, asconf)) |
2735 | sctp_chunk_free(asconf); |
2736 | else |
2737 | asoc->addip_last_asconf = asconf; |
2738 | } |
2739 | |
2740 | return retval; |
2741 | } |
2742 | |
2743 | /* Make a FWD TSN chunk. */ |
2744 | struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, |
2745 | __u32 new_cum_tsn, size_t nstreams, |
2746 | struct sctp_fwdtsn_skip *skiplist) |
2747 | { |
2748 | struct sctp_chunk *retval = NULL; |
2749 | struct sctp_fwdtsn_chunk *ftsn_chunk; |
2750 | struct sctp_fwdtsn_hdr ftsn_hdr; |
2751 | struct sctp_fwdtsn_skip skip; |
2752 | size_t hint; |
2753 | int i; |
2754 | |
2755 | hint = (nstreams + 1) * sizeof(__u32); |
2756 | |
2757 | retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); |
2758 | |
2759 | if (!retval) |
2760 | return NULL; |
2761 | |
2762 | ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; |
2763 | |
2764 | ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); |
2765 | retval->subh.fwdtsn_hdr = |
2766 | sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); |
2767 | |
2768 | for (i = 0; i < nstreams; i++) { |
2769 | skip.stream = skiplist[i].stream; |
2770 | skip.ssn = skiplist[i].ssn; |
2771 | sctp_addto_chunk(retval, sizeof(skip), &skip); |
2772 | } |
2773 | |
2774 | return retval; |
2775 | } |