1 /* SCTP kernel 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.
7 * This file is part of the SCTP kernel implementation
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.
13 * This SCTP 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)
19 * This SCTP 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.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * C. Robin <chris@hundredacre.ac.uk>
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * Xingang Guo <xingang.guo@intel.com>
39 * Dajiang Zhang <dajiang.zhang@nokia.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Ardelle Fan <ardelle.fan@intel.com>
43 * Kevin Gao <kevin.gao@intel.com>
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <crypto/hash.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
52 #include <linux/ipv6.h>
53 #include <linux/net.h>
54 #include <linux/inet.h>
55 #include <linux/scatterlist.h>
56 #include <linux/slab.h>
59 #include <linux/skbuff.h>
60 #include <linux/random.h> /* for get_random_bytes */
61 #include <net/sctp/sctp.h>
62 #include <net/sctp/sm.h>
64 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
65 __u8 type, __u8 flags, int paylen,
67 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
68 __u8 flags, int paylen, gfp_t gfp);
69 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
70 __u8 type, __u8 flags, int paylen,
72 static struct sctp_cookie_param *sctp_pack_cookie(
73 const struct sctp_endpoint *ep,
74 const struct sctp_association *asoc,
75 const struct sctp_chunk *init_chunk,
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,
82 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
84 static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
87 /* Control chunk destructor */
88 static void sctp_control_release_owner(struct sk_buff *skb)
90 /*TODO: do memory release */
93 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
95 struct sctp_association *asoc = chunk->asoc;
96 struct sk_buff *skb = chunk->skb;
98 /* TODO: properly account for control chunks.
99 * To do it right we'll need:
100 * 1) endpoint if association isn't known.
101 * 2) proper memory accounting.
103 * For now don't do anything for now.
105 skb->sk = asoc ? asoc->base.sk : NULL;
106 skb->destructor = sctp_control_release_owner;
109 /* What was the inbound interface for this chunk? */
110 int sctp_chunk_iif(const struct sctp_chunk *chunk)
112 struct sk_buff *skb = chunk->skb;
114 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
117 /* RFC 2960 3.3.2 Initiation (INIT) (1)
119 * Note 2: The ECN capable field is reserved for future use of
120 * Explicit Congestion Notification.
122 static const struct sctp_paramhdr ecap_param = {
123 SCTP_PARAM_ECN_CAPABLE,
124 cpu_to_be16(sizeof(struct sctp_paramhdr)),
126 static const struct sctp_paramhdr prsctp_param = {
127 SCTP_PARAM_FWD_TSN_SUPPORT,
128 cpu_to_be16(sizeof(struct sctp_paramhdr)),
131 /* A helper to initialize an op error inside a
132 * provided chunk, as most cause codes will be embedded inside an
135 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
138 struct sctp_errhdr err;
141 /* Cause code constants are now defined in network order. */
142 err.cause = cause_code;
143 len = sizeof(err) + paylen;
144 err.length = htons(len);
145 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
148 /* A helper to initialize an op error inside a
149 * provided chunk, as most cause codes will be embedded inside an
150 * abort chunk. Differs from sctp_init_cause in that it won't oops
151 * if there isn't enough space in the op error chunk
153 static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
156 struct sctp_errhdr err;
159 /* Cause code constants are now defined in network order. */
160 err.cause = cause_code;
161 len = sizeof(err) + paylen;
162 err.length = htons(len);
164 if (skb_tailroom(chunk->skb) < len)
167 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err);
171 /* 3.3.2 Initiation (INIT) (1)
173 * This chunk is used to initiate a SCTP association between two
174 * endpoints. The format of the INIT chunk is shown below:
177 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * | Type = 1 | Chunk Flags | Chunk Length |
180 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Advertised Receiver Window Credit (a_rwnd) |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Number of Outbound Streams | Number of Inbound Streams |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
190 * / Optional/Variable-Length Parameters /
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
195 * The INIT chunk contains the following parameters. Unless otherwise
196 * noted, each parameter MUST only be included once in the INIT chunk.
198 * Fixed Parameters Status
199 * ----------------------------------------------
200 * Initiate Tag Mandatory
201 * Advertised Receiver Window Credit Mandatory
202 * Number of Outbound Streams Mandatory
203 * Number of Inbound Streams Mandatory
204 * Initial TSN Mandatory
206 * Variable Parameters Status Type Value
207 * -------------------------------------------------------------
208 * IPv4 Address (Note 1) Optional 5
209 * IPv6 Address (Note 1) Optional 6
210 * Cookie Preservative Optional 9
211 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
212 * Host Name Address (Note 3) Optional 11
213 * Supported Address Types (Note 4) Optional 12
215 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
216 const struct sctp_bind_addr *bp,
217 gfp_t gfp, int vparam_len)
219 struct net *net = sock_net(asoc->base.sk);
220 struct sctp_supported_ext_param ext_param;
221 struct sctp_adaptation_ind_param aiparam;
222 struct sctp_paramhdr *auth_chunks = NULL;
223 struct sctp_paramhdr *auth_hmacs = NULL;
224 struct sctp_supported_addrs_param sat;
225 struct sctp_endpoint *ep = asoc->ep;
226 struct sctp_chunk *retval = NULL;
227 int num_types, addrs_len = 0;
228 struct sctp_inithdr init;
229 union sctp_params addrs;
230 struct sctp_sock *sp;
236 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 * Note 1: The INIT chunks can contain multiple addresses that
239 * can be IPv4 and/or IPv6 in any combination.
242 /* Convert the provided bind address list to raw format. */
243 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
245 init.init_tag = htonl(asoc->c.my_vtag);
246 init.a_rwnd = htonl(asoc->rwnd);
247 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
248 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
249 init.initial_tsn = htonl(asoc->c.initial_tsn);
251 /* How many address types are needed? */
252 sp = sctp_sk(asoc->base.sk);
253 num_types = sp->pf->supported_addrs(sp, types);
255 chunksize = sizeof(init) + addrs_len;
256 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
257 chunksize += sizeof(ecap_param);
259 if (asoc->prsctp_enable)
260 chunksize += sizeof(prsctp_param);
262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
267 if (net->sctp.addip_enable) {
268 extensions[num_ext] = SCTP_CID_ASCONF;
269 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
273 if (asoc->reconf_enable) {
274 extensions[num_ext] = SCTP_CID_RECONF;
278 if (sp->adaptation_ind)
279 chunksize += sizeof(aiparam);
281 chunksize += vparam_len;
283 /* Account for AUTH related parameters */
284 if (ep->auth_enable) {
285 /* Add random parameter length*/
286 chunksize += sizeof(asoc->c.auth_random);
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
290 if (auth_hmacs->length)
291 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
295 /* Add CHUNKS parameter length */
296 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
297 if (auth_chunks->length)
298 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
302 extensions[num_ext] = SCTP_CID_AUTH;
306 /* If we have any extensions to report, account for that */
308 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
310 /* RFC 2960 3.3.2 Initiation (INIT) (1)
312 * Note 3: An INIT chunk MUST NOT contain more than one Host
313 * Name address parameter. Moreover, the sender of the INIT
314 * MUST NOT combine any other address types with the Host Name
315 * address in the INIT. The receiver of INIT MUST ignore any
316 * other address types if the Host Name address parameter is
317 * present in the received INIT chunk.
319 * PLEASE DO NOT FIXME [This version does not support Host Name.]
322 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
326 retval->subh.init_hdr =
327 sctp_addto_chunk(retval, sizeof(init), &init);
328 retval->param_hdr.v =
329 sctp_addto_chunk(retval, addrs_len, addrs.v);
331 /* RFC 2960 3.3.2 Initiation (INIT) (1)
333 * Note 4: This parameter, when present, specifies all the
334 * address types the sending endpoint can support. The absence
335 * of this parameter indicates that the sending endpoint can
336 * support any address type.
338 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
339 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
340 sctp_addto_chunk(retval, sizeof(sat), &sat);
341 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
343 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
345 /* Add the supported extensions parameter. Be nice and add this
346 * fist before addiding the parameters for the extensions themselves
349 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
350 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
351 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
352 sctp_addto_param(retval, num_ext, extensions);
355 if (asoc->prsctp_enable)
356 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
358 if (sp->adaptation_ind) {
359 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
360 aiparam.param_hdr.length = htons(sizeof(aiparam));
361 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
362 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
365 /* Add SCTP-AUTH chunks to the parameter list */
366 if (ep->auth_enable) {
367 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
368 asoc->c.auth_random);
370 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
373 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
381 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
382 const struct sctp_chunk *chunk,
383 gfp_t gfp, int unkparam_len)
385 struct sctp_supported_ext_param ext_param;
386 struct sctp_adaptation_ind_param aiparam;
387 struct sctp_paramhdr *auth_chunks = NULL;
388 struct sctp_paramhdr *auth_random = NULL;
389 struct sctp_paramhdr *auth_hmacs = NULL;
390 struct sctp_chunk *retval = NULL;
391 struct sctp_cookie_param *cookie;
392 struct sctp_inithdr initack;
393 union sctp_params addrs;
394 struct sctp_sock *sp;
401 /* Note: there may be no addresses to embed. */
402 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
404 initack.init_tag = htonl(asoc->c.my_vtag);
405 initack.a_rwnd = htonl(asoc->rwnd);
406 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
407 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
408 initack.initial_tsn = htonl(asoc->c.initial_tsn);
410 /* FIXME: We really ought to build the cookie right
411 * into the packet instead of allocating more fresh memory.
413 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
418 /* Calculate the total size of allocation, include the reserved
419 * space for reporting unknown parameters if it is specified.
421 sp = sctp_sk(asoc->base.sk);
422 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
424 /* Tell peer that we'll do ECN only if peer advertised such cap. */
425 if (asoc->peer.ecn_capable)
426 chunksize += sizeof(ecap_param);
428 if (asoc->peer.prsctp_capable)
429 chunksize += sizeof(prsctp_param);
431 if (asoc->peer.asconf_capable) {
432 extensions[num_ext] = SCTP_CID_ASCONF;
433 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
437 if (asoc->peer.reconf_capable) {
438 extensions[num_ext] = SCTP_CID_RECONF;
442 if (sp->adaptation_ind)
443 chunksize += sizeof(aiparam);
445 if (asoc->peer.auth_capable) {
446 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
447 chunksize += ntohs(auth_random->length);
449 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
450 if (auth_hmacs->length)
451 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
455 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
456 if (auth_chunks->length)
457 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
461 extensions[num_ext] = SCTP_CID_AUTH;
466 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
468 /* Now allocate and fill out the chunk. */
469 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
473 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
475 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
476 * HEARTBEAT ACK, * etc.) to the same destination transport
477 * address from which it received the DATA or control chunk
478 * to which it is replying.
480 * [INIT ACK back to where the INIT came from.]
482 retval->transport = chunk->transport;
484 retval->subh.init_hdr =
485 sctp_addto_chunk(retval, sizeof(initack), &initack);
486 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
487 sctp_addto_chunk(retval, cookie_len, cookie);
488 if (asoc->peer.ecn_capable)
489 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
491 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
492 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
493 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
494 sctp_addto_param(retval, num_ext, extensions);
496 if (asoc->peer.prsctp_capable)
497 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
499 if (sp->adaptation_ind) {
500 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
501 aiparam.param_hdr.length = htons(sizeof(aiparam));
502 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
503 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
506 if (asoc->peer.auth_capable) {
507 sctp_addto_chunk(retval, ntohs(auth_random->length),
510 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
513 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
517 /* We need to remove the const qualifier at this point. */
518 retval->asoc = (struct sctp_association *) asoc;
527 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
529 * This chunk is used only during the initialization of an association.
530 * It is sent by the initiator of an association to its peer to complete
531 * the initialization process. This chunk MUST precede any DATA chunk
532 * sent within the association, but MAY be bundled with one or more DATA
533 * chunks in the same packet.
536 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * | Type = 10 |Chunk Flags | Length |
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * Set to zero on transmit and ignored on receipt.
548 * Length: 16 bits (unsigned integer)
550 * Set to the size of the chunk in bytes, including the 4 bytes of
551 * the chunk header and the size of the Cookie.
553 * Cookie: variable size
555 * This field must contain the exact cookie received in the
556 * State Cookie parameter from the previous INIT ACK.
558 * An implementation SHOULD make the cookie as small as possible
559 * to insure interoperability.
561 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
562 const struct sctp_chunk *chunk)
564 struct sctp_chunk *retval;
568 cookie = asoc->peer.cookie;
569 cookie_len = asoc->peer.cookie_len;
571 /* Build a cookie echo chunk. */
572 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
573 cookie_len, GFP_ATOMIC);
576 retval->subh.cookie_hdr =
577 sctp_addto_chunk(retval, cookie_len, cookie);
579 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
581 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
582 * HEARTBEAT ACK, * etc.) to the same destination transport
583 * address from which it * received the DATA or control chunk
584 * to which it is replying.
586 * [COOKIE ECHO back to where the INIT ACK came from.]
589 retval->transport = chunk->transport;
595 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
597 * This chunk is used only during the initialization of an
598 * association. It is used to acknowledge the receipt of a COOKIE
599 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
600 * within the association, but MAY be bundled with one or more DATA
601 * chunks or SACK chunk in the same SCTP packet.
604 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
606 * | Type = 11 |Chunk Flags | Length = 4 |
607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * Chunk Flags: 8 bits
611 * Set to zero on transmit and ignored on receipt.
613 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
614 const struct sctp_chunk *chunk)
616 struct sctp_chunk *retval;
618 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
620 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
622 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
623 * HEARTBEAT ACK, * etc.) to the same destination transport
624 * address from which it * received the DATA or control chunk
625 * to which it is replying.
627 * [COOKIE ACK back to where the COOKIE ECHO came from.]
630 retval->transport = chunk->transport;
636 * Appendix A: Explicit Congestion Notification:
639 * RFC 2481 details a specific bit for a sender to send in the header of
640 * its next outbound TCP segment to indicate to its peer that it has
641 * reduced its congestion window. This is termed the CWR bit. For
642 * SCTP the same indication is made by including the CWR chunk.
643 * This chunk contains one data element, i.e. the TSN number that
644 * was sent in the ECNE chunk. This element represents the lowest
645 * TSN number in the datagram that was originally marked with the
649 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653 * | Lowest TSN Number |
654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * Note: The CWR is considered a Control chunk.
658 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
659 const __u32 lowest_tsn,
660 const struct sctp_chunk *chunk)
662 struct sctp_chunk *retval;
663 struct sctp_cwrhdr cwr;
665 cwr.lowest_tsn = htonl(lowest_tsn);
666 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
667 sizeof(cwr), GFP_ATOMIC);
672 retval->subh.ecn_cwr_hdr =
673 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
675 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
677 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
678 * HEARTBEAT ACK, * etc.) to the same destination transport
679 * address from which it * received the DATA or control chunk
680 * to which it is replying.
682 * [Report a reduced congestion window back to where the ECNE
686 retval->transport = chunk->transport;
692 /* Make an ECNE chunk. This is a congestion experienced report. */
693 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
694 const __u32 lowest_tsn)
696 struct sctp_chunk *retval;
697 struct sctp_ecnehdr ecne;
699 ecne.lowest_tsn = htonl(lowest_tsn);
700 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
701 sizeof(ecne), GFP_ATOMIC);
704 retval->subh.ecne_hdr =
705 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
711 /* Make a DATA chunk for the given association from the provided
712 * parameters. However, do not populate the data payload.
714 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
715 const struct sctp_sndrcvinfo *sinfo,
716 int data_len, __u8 flags, __u16 ssn,
719 struct sctp_chunk *retval;
720 struct sctp_datahdr dp;
723 /* We assign the TSN as LATE as possible, not here when
724 * creating the chunk.
727 dp.stream = htons(sinfo->sinfo_stream);
728 dp.ppid = sinfo->sinfo_ppid;
730 /* Set the flags for an unordered send. */
731 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
732 flags |= SCTP_DATA_UNORDERED;
737 chunk_len = sizeof(dp) + data_len;
738 retval = sctp_make_data(asoc, flags, chunk_len, gfp);
742 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
743 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
749 /* Create a selective ackowledgement (SACK) for the given
750 * association. This reports on which TSN's we've seen to date,
751 * including duplicates and gaps.
753 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
755 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
756 struct sctp_association *aptr = (struct sctp_association *)asoc;
757 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
758 __u16 num_gabs, num_dup_tsns;
759 struct sctp_transport *trans;
760 struct sctp_chunk *retval;
761 struct sctp_sackhdr sack;
765 memset(gabs, 0, sizeof(gabs));
766 ctsn = sctp_tsnmap_get_ctsn(map);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
770 /* How much room is needed in the chunk? */
771 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
772 num_dup_tsns = sctp_tsnmap_num_dups(map);
774 /* Initialize the SACK header. */
775 sack.cum_tsn_ack = htonl(ctsn);
776 sack.a_rwnd = htonl(asoc->a_rwnd);
777 sack.num_gap_ack_blocks = htons(num_gabs);
778 sack.num_dup_tsns = htons(num_dup_tsns);
781 + sizeof(struct sctp_gap_ack_block) * num_gabs
782 + sizeof(__u32) * num_dup_tsns;
784 /* Create the chunk. */
785 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval->transport = asoc->peer.last_data_from;
821 retval->subh.sack_hdr =
822 sctp_addto_chunk(retval, sizeof(sack), &sack);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
829 /* Add the duplicate TSN information. */
831 aptr->stats.idupchunks += num_dup_tsns;
832 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
833 sctp_tsnmap_get_dups(map));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++aptr->peer.sack_generation == 0) {
844 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
846 trans->sack_generation = 0;
847 aptr->peer.sack_generation = 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
857 struct sctp_shutdownhdr shut;
858 struct sctp_chunk *retval;
861 if (chunk && chunk->asoc)
862 ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map);
864 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
866 shut.cum_tsn_ack = htonl(ctsn);
868 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
869 sizeof(shut), GFP_ATOMIC);
873 retval->subh.shutdown_hdr =
874 sctp_addto_chunk(retval, sizeof(shut), &shut);
877 retval->transport = chunk->transport;
882 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
883 const struct sctp_chunk *chunk)
885 struct sctp_chunk *retval;
887 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
897 * [ACK back to where the SHUTDOWN came from.]
900 retval->transport = chunk->transport;
905 struct sctp_chunk *sctp_make_shutdown_complete(
906 const struct sctp_association *asoc,
907 const struct sctp_chunk *chunk)
909 struct sctp_chunk *retval;
912 /* Set the T-bit if we have no association (vtag will be
915 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
917 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
920 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
922 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
923 * HEARTBEAT ACK, * etc.) to the same destination transport
924 * address from which it * received the DATA or control chunk
925 * to which it is replying.
927 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
931 retval->transport = chunk->transport;
936 /* Create an ABORT. Note that we set the T bit if we have no
937 * association, except when responding to an INIT (sctpimpguide 2.41).
939 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
940 const struct sctp_chunk *chunk,
943 struct sctp_chunk *retval;
946 /* Set the T-bit if we have no association and 'chunk' is not
947 * an INIT (vtag will be reflected).
950 if (chunk && chunk->chunk_hdr &&
951 chunk->chunk_hdr->type == SCTP_CID_INIT)
954 flags = SCTP_CHUNK_FLAG_T;
957 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
960 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
962 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
963 * HEARTBEAT ACK, * etc.) to the same destination transport
964 * address from which it * received the DATA or control chunk
965 * to which it is replying.
967 * [ABORT back to where the offender came from.]
970 retval->transport = chunk->transport;
975 /* Helper to create ABORT with a NO_USER_DATA error. */
976 struct sctp_chunk *sctp_make_abort_no_data(
977 const struct sctp_association *asoc,
978 const struct sctp_chunk *chunk,
981 struct sctp_chunk *retval;
984 retval = sctp_make_abort(asoc, chunk,
985 sizeof(struct sctp_errhdr) + sizeof(tsn));
990 /* Put the tsn back into network byte order. */
991 payload = htonl(tsn);
992 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
993 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
995 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
997 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
998 * HEARTBEAT ACK, * etc.) to the same destination transport
999 * address from which it * received the DATA or control chunk
1000 * to which it is replying.
1002 * [ABORT back to where the offender came from.]
1005 retval->transport = chunk->transport;
1011 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1012 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1016 struct sctp_chunk *retval;
1017 void *payload = NULL;
1020 retval = sctp_make_abort(asoc, NULL,
1021 sizeof(struct sctp_errhdr) + paylen);
1026 /* Put the msg_iov together into payload. */
1027 payload = kmalloc(paylen, GFP_KERNEL);
1031 err = memcpy_from_msg(payload, msg, paylen);
1036 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1037 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_chunk_free(retval);
1053 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1056 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1059 int chunklen = ntohs(chunk->chunk_hdr->length);
1062 target = skb_put(chunk->skb, len);
1065 memcpy(target, data, len);
1067 memset(target, 0, len);
1069 /* Adjust the chunk length field. */
1070 chunk->chunk_hdr->length = htons(chunklen + len);
1071 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1076 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1077 struct sctp_chunk *sctp_make_abort_violation(
1078 const struct sctp_association *asoc,
1079 const struct sctp_chunk *chunk,
1080 const __u8 *payload,
1081 const size_t paylen)
1083 struct sctp_chunk *retval;
1084 struct sctp_paramhdr phdr;
1086 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1087 paylen + sizeof(phdr));
1091 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1094 phdr.type = htons(chunk->chunk_hdr->type);
1095 phdr.length = chunk->chunk_hdr->length;
1096 sctp_addto_chunk(retval, paylen, payload);
1097 sctp_addto_param(retval, sizeof(phdr), &phdr);
1103 struct sctp_chunk *sctp_make_violation_paramlen(
1104 const struct sctp_association *asoc,
1105 const struct sctp_chunk *chunk,
1106 struct sctp_paramhdr *param)
1108 static const char error[] = "The following parameter had invalid length:";
1109 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1111 struct sctp_chunk *retval;
1113 retval = sctp_make_abort(asoc, chunk, payload_len);
1117 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1118 sizeof(error) + sizeof(*param));
1119 sctp_addto_chunk(retval, sizeof(error), error);
1120 sctp_addto_param(retval, sizeof(*param), param);
1126 struct sctp_chunk *sctp_make_violation_max_retrans(
1127 const struct sctp_association *asoc,
1128 const struct sctp_chunk *chunk)
1130 static const char error[] = "Association exceeded its max_retans count";
1131 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1132 struct sctp_chunk *retval;
1134 retval = sctp_make_abort(asoc, chunk, payload_len);
1138 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1139 sctp_addto_chunk(retval, sizeof(error), error);
1145 /* Make a HEARTBEAT chunk. */
1146 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1147 const struct sctp_transport *transport)
1149 struct sctp_sender_hb_info hbinfo;
1150 struct sctp_chunk *retval;
1152 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1153 sizeof(hbinfo), GFP_ATOMIC);
1158 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1159 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1160 hbinfo.daddr = transport->ipaddr;
1161 hbinfo.sent_at = jiffies;
1162 hbinfo.hb_nonce = transport->hb_nonce;
1164 /* Cast away the 'const', as this is just telling the chunk
1165 * what transport it belongs to.
1167 retval->transport = (struct sctp_transport *) transport;
1168 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1175 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1176 const struct sctp_chunk *chunk,
1177 const void *payload,
1178 const size_t paylen)
1180 struct sctp_chunk *retval;
1182 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1187 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1189 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1191 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1192 * HEARTBEAT ACK, * etc.) to the same destination transport
1193 * address from which it * received the DATA or control chunk
1194 * to which it is replying.
1196 * [HBACK back to where the HEARTBEAT came from.]
1199 retval->transport = chunk->transport;
1205 /* Create an Operation Error chunk with the specified space reserved.
1206 * This routine can be used for containing multiple causes in the chunk.
1208 static struct sctp_chunk *sctp_make_op_error_space(
1209 const struct sctp_association *asoc,
1210 const struct sctp_chunk *chunk,
1213 struct sctp_chunk *retval;
1215 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1216 sizeof(struct sctp_errhdr) + size,
1221 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1223 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1224 * HEARTBEAT ACK, etc.) to the same destination transport
1225 * address from which it received the DATA or control chunk
1226 * to which it is replying.
1230 retval->transport = chunk->transport;
1236 /* Create an Operation Error chunk of a fixed size,
1237 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1238 * This is a helper function to allocate an error chunk for
1239 * for those invalid parameter codes in which we may not want
1240 * to report all the errors, if the incoming chunk is large
1242 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1243 const struct sctp_association *asoc,
1244 const struct sctp_chunk *chunk)
1246 size_t size = asoc ? asoc->pathmtu : 0;
1249 size = SCTP_DEFAULT_MAXSEGMENT;
1251 return sctp_make_op_error_space(asoc, chunk, size);
1254 /* Create an Operation Error chunk. */
1255 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1256 const struct sctp_chunk *chunk,
1257 __be16 cause_code, const void *payload,
1258 size_t paylen, size_t reserve_tail)
1260 struct sctp_chunk *retval;
1262 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1266 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1267 sctp_addto_chunk(retval, paylen, payload);
1269 sctp_addto_param(retval, reserve_tail, NULL);
1275 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1277 struct sctp_authhdr auth_hdr;
1278 struct sctp_hmac *hmac_desc;
1279 struct sctp_chunk *retval;
1282 /* Get the first hmac that the peer told us to use */
1283 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1284 if (unlikely(!hmac_desc))
1287 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1288 hmac_desc->hmac_len + sizeof(auth_hdr),
1293 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1294 auth_hdr.shkey_id = htons(asoc->active_key_id);
1296 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1299 hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len);
1301 /* Adjust the chunk header to include the empty MAC */
1302 retval->chunk_hdr->length =
1303 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1304 retval->chunk_end = skb_tail_pointer(retval->skb);
1310 /********************************************************************
1311 * 2nd Level Abstractions
1312 ********************************************************************/
1314 /* Turn an skb into a chunk.
1315 * FIXME: Eventually move the structure directly inside the skb->cb[].
1317 * sctpimpguide-05.txt Section 2.8.2
1318 * M1) Each time a new DATA chunk is transmitted
1319 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1320 * 'TSN.Missing.Report' count will be used to determine missing chunks
1321 * and when to fast retransmit.
1324 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1325 const struct sctp_association *asoc,
1326 struct sock *sk, gfp_t gfp)
1328 struct sctp_chunk *retval;
1330 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1335 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1337 INIT_LIST_HEAD(&retval->list);
1339 retval->asoc = (struct sctp_association *)asoc;
1340 retval->singleton = 1;
1342 retval->fast_retransmit = SCTP_CAN_FRTX;
1344 /* Polish the bead hole. */
1345 INIT_LIST_HEAD(&retval->transmitted_list);
1346 INIT_LIST_HEAD(&retval->frag_list);
1347 SCTP_DBG_OBJCNT_INC(chunk);
1348 refcount_set(&retval->refcnt, 1);
1354 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1355 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1356 union sctp_addr *dest)
1358 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1359 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1362 /* Extract the source address from a chunk. */
1363 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1365 /* If we have a known transport, use that. */
1366 if (chunk->transport) {
1367 return &chunk->transport->ipaddr;
1369 /* Otherwise, extract it from the IP header. */
1370 return &chunk->source;
1374 /* Create a new chunk, setting the type and flags headers from the
1375 * arguments, reserving enough space for a 'paylen' byte payload.
1377 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1378 __u8 type, __u8 flags, int paylen,
1381 struct sctp_chunkhdr *chunk_hdr;
1382 struct sctp_chunk *retval;
1383 struct sk_buff *skb;
1387 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1388 if (chunklen > SCTP_MAX_CHUNK_LEN)
1391 /* No need to allocate LL here, as this is only a chunk. */
1392 skb = alloc_skb(chunklen, gfp);
1396 /* Make room for the chunk header. */
1397 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1398 chunk_hdr->type = type;
1399 chunk_hdr->flags = flags;
1400 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1402 sk = asoc ? asoc->base.sk : NULL;
1403 retval = sctp_chunkify(skb, asoc, sk, gfp);
1409 retval->chunk_hdr = chunk_hdr;
1410 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1412 /* Determine if the chunk needs to be authenticated */
1413 if (sctp_auth_send_cid(type, asoc))
1421 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1422 __u8 flags, int paylen, gfp_t gfp)
1424 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1427 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1428 __u8 type, __u8 flags, int paylen,
1431 struct sctp_chunk *chunk;
1433 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1435 sctp_control_set_owner_w(chunk);
1440 /* Release the memory occupied by a chunk. */
1441 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1443 BUG_ON(!list_empty(&chunk->list));
1444 list_del_init(&chunk->transmitted_list);
1446 consume_skb(chunk->skb);
1447 consume_skb(chunk->auth_chunk);
1449 SCTP_DBG_OBJCNT_DEC(chunk);
1450 kmem_cache_free(sctp_chunk_cachep, chunk);
1453 /* Possibly, free the chunk. */
1454 void sctp_chunk_free(struct sctp_chunk *chunk)
1456 /* Release our reference on the message tracker. */
1458 sctp_datamsg_put(chunk->msg);
1460 sctp_chunk_put(chunk);
1463 /* Grab a reference to the chunk. */
1464 void sctp_chunk_hold(struct sctp_chunk *ch)
1466 refcount_inc(&ch->refcnt);
1469 /* Release a reference to the chunk. */
1470 void sctp_chunk_put(struct sctp_chunk *ch)
1472 if (refcount_dec_and_test(&ch->refcnt))
1473 sctp_chunk_destroy(ch);
1476 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1479 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1481 int chunklen = ntohs(chunk->chunk_hdr->length);
1482 int padlen = SCTP_PAD4(chunklen) - chunklen;
1485 skb_put_zero(chunk->skb, padlen);
1486 target = skb_put_data(chunk->skb, data, len);
1488 /* Adjust the chunk length field. */
1489 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1490 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1495 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1496 * space in the chunk
1498 static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1499 int len, const void *data)
1501 if (skb_tailroom(chunk->skb) >= len)
1502 return sctp_addto_chunk(chunk, len, data);
1507 /* Append bytes from user space to the end of a chunk. Will panic if
1508 * chunk is not big enough.
1509 * Returns a kernel err value.
1511 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1512 struct iov_iter *from)
1516 /* Make room in chunk for data. */
1517 target = skb_put(chunk->skb, len);
1519 /* Copy data (whole iovec) into chunk */
1520 if (!copy_from_iter_full(target, len, from))
1523 /* Adjust the chunk length field. */
1524 chunk->chunk_hdr->length =
1525 htons(ntohs(chunk->chunk_hdr->length) + len);
1526 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1531 /* Helper function to assign a TSN if needed. This assumes that both
1532 * the data_hdr and association have already been assigned.
1534 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1536 struct sctp_stream *stream;
1537 struct sctp_chunk *lchunk;
1538 struct sctp_datamsg *msg;
1544 /* All fragments will be on the same stream */
1545 sid = ntohs(chunk->subh.data_hdr->stream);
1546 stream = &chunk->asoc->stream;
1548 /* Now assign the sequence number to the entire message.
1549 * All fragments must have the same stream sequence number.
1552 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1553 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1556 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1557 ssn = sctp_ssn_next(stream, out, sid);
1559 ssn = sctp_ssn_peek(stream, out, sid);
1562 lchunk->subh.data_hdr->ssn = htons(ssn);
1563 lchunk->has_ssn = 1;
1567 /* Helper function to assign a TSN if needed. This assumes that both
1568 * the data_hdr and association have already been assigned.
1570 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1572 if (!chunk->has_tsn) {
1573 /* This is the last possible instant to
1576 chunk->subh.data_hdr->tsn =
1577 htonl(sctp_association_get_next_tsn(chunk->asoc));
1582 /* Create a CLOSED association to use with an incoming packet. */
1583 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1584 struct sctp_chunk *chunk,
1587 struct sctp_association *asoc;
1588 enum sctp_scope scope;
1589 struct sk_buff *skb;
1591 /* Create the bare association. */
1592 scope = sctp_scope(sctp_source(chunk));
1593 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1598 /* Create an entry for the source address of the packet. */
1599 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1605 /* Build a cookie representing asoc.
1606 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1608 static struct sctp_cookie_param *sctp_pack_cookie(
1609 const struct sctp_endpoint *ep,
1610 const struct sctp_association *asoc,
1611 const struct sctp_chunk *init_chunk,
1612 int *cookie_len, const __u8 *raw_addrs,
1615 struct sctp_signed_cookie *cookie;
1616 struct sctp_cookie_param *retval;
1617 int headersize, bodysize;
1619 /* Header size is static data prior to the actual cookie, including
1622 headersize = sizeof(struct sctp_paramhdr) +
1623 (sizeof(struct sctp_signed_cookie) -
1624 sizeof(struct sctp_cookie));
1625 bodysize = sizeof(struct sctp_cookie)
1626 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1628 /* Pad out the cookie to a multiple to make the signature
1629 * functions simpler to write.
1631 if (bodysize % SCTP_COOKIE_MULTIPLE)
1632 bodysize += SCTP_COOKIE_MULTIPLE
1633 - (bodysize % SCTP_COOKIE_MULTIPLE);
1634 *cookie_len = headersize + bodysize;
1636 /* Clear this memory since we are sending this data structure
1637 * out on the network.
1639 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1643 cookie = (struct sctp_signed_cookie *) retval->body;
1645 /* Set up the parameter header. */
1646 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1647 retval->p.length = htons(*cookie_len);
1649 /* Copy the cookie part of the association itself. */
1650 cookie->c = asoc->c;
1651 /* Save the raw address list length in the cookie. */
1652 cookie->c.raw_addr_list_len = addrs_len;
1654 /* Remember PR-SCTP capability. */
1655 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1657 /* Save adaptation indication in the cookie. */
1658 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1660 /* Set an expiration time for the cookie. */
1661 cookie->c.expiration = ktime_add(asoc->cookie_life,
1664 /* Copy the peer's init packet. */
1665 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1666 ntohs(init_chunk->chunk_hdr->length));
1668 /* Copy the raw local address list of the association. */
1669 memcpy((__u8 *)&cookie->c.peer_init[0] +
1670 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1672 if (sctp_sk(ep->base.sk)->hmac) {
1673 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1676 /* Sign the message. */
1677 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1680 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1681 sizeof(ep->secret_key)) ?:
1682 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1684 shash_desc_zero(desc);
1698 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1699 struct sctp_association *sctp_unpack_cookie(
1700 const struct sctp_endpoint *ep,
1701 const struct sctp_association *asoc,
1702 struct sctp_chunk *chunk, gfp_t gfp,
1703 int *error, struct sctp_chunk **errp)
1705 struct sctp_association *retval = NULL;
1706 int headersize, bodysize, fixed_size;
1707 struct sctp_signed_cookie *cookie;
1708 struct sk_buff *skb = chunk->skb;
1709 struct sctp_cookie *bear_cookie;
1710 __u8 *digest = ep->digest;
1711 enum sctp_scope scope;
1715 /* Header size is static data prior to the actual cookie, including
1718 headersize = sizeof(struct sctp_chunkhdr) +
1719 (sizeof(struct sctp_signed_cookie) -
1720 sizeof(struct sctp_cookie));
1721 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1722 fixed_size = headersize + sizeof(struct sctp_cookie);
1724 /* Verify that the chunk looks like it even has a cookie.
1725 * There must be enough room for our cookie and our peer's
1728 len = ntohs(chunk->chunk_hdr->length);
1729 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1732 /* Verify that the cookie has been padded out. */
1733 if (bodysize % SCTP_COOKIE_MULTIPLE)
1736 /* Process the cookie. */
1737 cookie = chunk->subh.cookie_hdr;
1738 bear_cookie = &cookie->c;
1740 if (!sctp_sk(ep->base.sk)->hmac)
1743 /* Check the signature. */
1745 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1748 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1751 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1752 sizeof(ep->secret_key)) ?:
1753 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1755 shash_desc_zero(desc);
1758 *error = -SCTP_IERROR_NOMEM;
1763 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1764 *error = -SCTP_IERROR_BAD_SIG;
1769 /* IG Section 2.35.2:
1770 * 3) Compare the port numbers and the verification tag contained
1771 * within the COOKIE ECHO chunk to the actual port numbers and the
1772 * verification tag within the SCTP common header of the received
1773 * packet. If these values do not match the packet MUST be silently
1776 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1777 *error = -SCTP_IERROR_BAD_TAG;
1781 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1782 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1783 *error = -SCTP_IERROR_BAD_PORTS;
1787 /* Check to see if the cookie is stale. If there is already
1788 * an association, there is no need to check cookie's expiration
1789 * for init collision case of lost COOKIE ACK.
1790 * If skb has been timestamped, then use the stamp, otherwise
1791 * use current time. This introduces a small possibility that
1792 * that a cookie may be considered expired, but his would only slow
1793 * down the new association establishment instead of every packet.
1795 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1796 kt = skb_get_ktime(skb);
1798 kt = ktime_get_real();
1800 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1802 * Section 3.3.10.3 Stale Cookie Error (3)
1806 * Stale Cookie Error: Indicates the receipt of a valid State
1807 * Cookie that has expired.
1809 len = ntohs(chunk->chunk_hdr->length);
1810 *errp = sctp_make_op_error_space(asoc, chunk, len);
1812 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1813 __be32 n = htonl(usecs);
1815 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1817 sctp_addto_chunk(*errp, sizeof(n), &n);
1818 *error = -SCTP_IERROR_STALE_COOKIE;
1820 *error = -SCTP_IERROR_NOMEM;
1825 /* Make a new base association. */
1826 scope = sctp_scope(sctp_source(chunk));
1827 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1829 *error = -SCTP_IERROR_NOMEM;
1833 /* Set up our peer's port number. */
1834 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1836 /* Populate the association from the cookie. */
1837 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1839 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1841 *error = -SCTP_IERROR_NOMEM;
1845 /* Also, add the destination address. */
1846 if (list_empty(&retval->base.bind_addr.address_list)) {
1847 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1848 sizeof(chunk->dest), SCTP_ADDR_SRC,
1852 retval->next_tsn = retval->c.initial_tsn;
1853 retval->ctsn_ack_point = retval->next_tsn - 1;
1854 retval->addip_serial = retval->c.initial_tsn;
1855 retval->strreset_outseq = retval->c.initial_tsn;
1856 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1857 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1858 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1860 /* The INIT stuff will be done by the side effects. */
1865 sctp_association_free(retval);
1870 /* Yikes! The packet is either corrupt or deliberately
1873 *error = -SCTP_IERROR_MALFORMED;
1877 /********************************************************************
1878 * 3rd Level Abstractions
1879 ********************************************************************/
1881 struct __sctp_missing {
1887 * Report a missing mandatory parameter.
1889 static int sctp_process_missing_param(const struct sctp_association *asoc,
1890 enum sctp_param paramtype,
1891 struct sctp_chunk *chunk,
1892 struct sctp_chunk **errp)
1894 struct __sctp_missing report;
1897 len = SCTP_PAD4(sizeof(report));
1899 /* Make an ERROR chunk, preparing enough room for
1900 * returning multiple unknown parameters.
1903 *errp = sctp_make_op_error_space(asoc, chunk, len);
1906 report.num_missing = htonl(1);
1907 report.type = paramtype;
1908 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1910 sctp_addto_chunk(*errp, sizeof(report), &report);
1913 /* Stop processing this chunk. */
1917 /* Report an Invalid Mandatory Parameter. */
1918 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1919 struct sctp_chunk *chunk,
1920 struct sctp_chunk **errp)
1922 /* Invalid Mandatory Parameter Error has no payload. */
1925 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1928 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1930 /* Stop processing this chunk. */
1934 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1935 struct sctp_paramhdr *param,
1936 const struct sctp_chunk *chunk,
1937 struct sctp_chunk **errp)
1939 /* This is a fatal error. Any accumulated non-fatal errors are
1943 sctp_chunk_free(*errp);
1945 /* Create an error chunk and fill it in with our payload. */
1946 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1952 /* Do not attempt to handle the HOST_NAME parm. However, do
1953 * send back an indicator to the peer.
1955 static int sctp_process_hn_param(const struct sctp_association *asoc,
1956 union sctp_params param,
1957 struct sctp_chunk *chunk,
1958 struct sctp_chunk **errp)
1960 __u16 len = ntohs(param.p->length);
1962 /* Processing of the HOST_NAME parameter will generate an
1963 * ABORT. If we've accumulated any non-fatal errors, they
1964 * would be unrecognized parameters and we should not include
1965 * them in the ABORT.
1968 sctp_chunk_free(*errp);
1970 *errp = sctp_make_op_error_space(asoc, chunk, len);
1973 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1974 sctp_addto_chunk(*errp, len, param.v);
1977 /* Stop processing this chunk. */
1981 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1983 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1984 int have_asconf = 0;
1988 for (i = 0; i < num_ext; i++) {
1989 switch (param.ext->chunks[i]) {
1993 case SCTP_CID_ASCONF:
1994 case SCTP_CID_ASCONF_ACK:
2000 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2001 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2002 * only if ADD-IP is turned on and we are not backward-compatible
2005 if (net->sctp.addip_noauth)
2008 if (net->sctp.addip_enable && !have_auth && have_asconf)
2014 static void sctp_process_ext_param(struct sctp_association *asoc,
2015 union sctp_params param)
2017 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2018 struct net *net = sock_net(asoc->base.sk);
2021 for (i = 0; i < num_ext; i++) {
2022 switch (param.ext->chunks[i]) {
2023 case SCTP_CID_RECONF:
2024 if (asoc->reconf_enable &&
2025 !asoc->peer.reconf_capable)
2026 asoc->peer.reconf_capable = 1;
2028 case SCTP_CID_FWD_TSN:
2029 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2030 asoc->peer.prsctp_capable = 1;
2033 /* if the peer reports AUTH, assume that he
2036 if (asoc->ep->auth_enable)
2037 asoc->peer.auth_capable = 1;
2039 case SCTP_CID_ASCONF:
2040 case SCTP_CID_ASCONF_ACK:
2041 if (net->sctp.addip_enable)
2042 asoc->peer.asconf_capable = 1;
2050 /* RFC 3.2.1 & the Implementers Guide 2.2.
2052 * The Parameter Types are encoded such that the
2053 * highest-order two bits specify the action that must be
2054 * taken if the processing endpoint does not recognize the
2057 * 00 - Stop processing this parameter; do not process any further
2058 * parameters within this chunk
2060 * 01 - Stop processing this parameter, do not process any further
2061 * parameters within this chunk, and report the unrecognized
2062 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2064 * 10 - Skip this parameter and continue processing.
2066 * 11 - Skip this parameter and continue processing but
2067 * report the unrecognized parameter in an
2068 * 'Unrecognized Parameter' ERROR chunk.
2071 * SCTP_IERROR_NO_ERROR - continue with the chunk
2072 * SCTP_IERROR_ERROR - stop and report an error.
2073 * SCTP_IERROR_NOMEME - out of memory.
2075 static enum sctp_ierror sctp_process_unk_param(
2076 const struct sctp_association *asoc,
2077 union sctp_params param,
2078 struct sctp_chunk *chunk,
2079 struct sctp_chunk **errp)
2081 int retval = SCTP_IERROR_NO_ERROR;
2083 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2084 case SCTP_PARAM_ACTION_DISCARD:
2085 retval = SCTP_IERROR_ERROR;
2087 case SCTP_PARAM_ACTION_SKIP:
2089 case SCTP_PARAM_ACTION_DISCARD_ERR:
2090 retval = SCTP_IERROR_ERROR;
2092 case SCTP_PARAM_ACTION_SKIP_ERR:
2093 /* Make an ERROR chunk, preparing enough room for
2094 * returning multiple unknown parameters.
2097 *errp = sctp_make_op_error_fixed(asoc, chunk);
2100 if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2101 SCTP_PAD4(ntohs(param.p->length))))
2102 sctp_addto_chunk_fixed(*errp,
2103 SCTP_PAD4(ntohs(param.p->length)),
2106 /* If there is no memory for generating the ERROR
2107 * report as specified, an ABORT will be triggered
2108 * to the peer and the association won't be
2111 retval = SCTP_IERROR_NOMEM;
2121 /* Verify variable length parameters
2123 * SCTP_IERROR_ABORT - trigger an ABORT
2124 * SCTP_IERROR_NOMEM - out of memory (abort)
2125 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2126 * SCTP_IERROR_NO_ERROR - continue with the chunk
2128 static enum sctp_ierror sctp_verify_param(struct net *net,
2129 const struct sctp_endpoint *ep,
2130 const struct sctp_association *asoc,
2131 union sctp_params param,
2133 struct sctp_chunk *chunk,
2134 struct sctp_chunk **err_chunk)
2136 struct sctp_hmac_algo_param *hmacs;
2137 int retval = SCTP_IERROR_NO_ERROR;
2138 __u16 n_elt, id = 0;
2141 /* FIXME - This routine is not looking at each parameter per the
2142 * chunk type, i.e., unrecognized parameters should be further
2143 * identified based on the chunk id.
2146 switch (param.p->type) {
2147 case SCTP_PARAM_IPV4_ADDRESS:
2148 case SCTP_PARAM_IPV6_ADDRESS:
2149 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2150 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2151 case SCTP_PARAM_STATE_COOKIE:
2152 case SCTP_PARAM_HEARTBEAT_INFO:
2153 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2154 case SCTP_PARAM_ECN_CAPABLE:
2155 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2158 case SCTP_PARAM_SUPPORTED_EXT:
2159 if (!sctp_verify_ext_param(net, param))
2160 return SCTP_IERROR_ABORT;
2163 case SCTP_PARAM_SET_PRIMARY:
2164 if (!net->sctp.addip_enable)
2167 if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) +
2168 sizeof(struct sctp_paramhdr)) {
2169 sctp_process_inv_paramlength(asoc, param.p,
2171 retval = SCTP_IERROR_ABORT;
2175 case SCTP_PARAM_HOST_NAME_ADDRESS:
2176 /* Tell the peer, we won't support this param. */
2177 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2178 retval = SCTP_IERROR_ABORT;
2181 case SCTP_PARAM_FWD_TSN_SUPPORT:
2182 if (ep->prsctp_enable)
2186 case SCTP_PARAM_RANDOM:
2187 if (!ep->auth_enable)
2190 /* SCTP-AUTH: Secion 6.1
2191 * If the random number is not 32 byte long the association
2192 * MUST be aborted. The ABORT chunk SHOULD contain the error
2193 * cause 'Protocol Violation'.
2195 if (SCTP_AUTH_RANDOM_LENGTH !=
2196 ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) {
2197 sctp_process_inv_paramlength(asoc, param.p,
2199 retval = SCTP_IERROR_ABORT;
2203 case SCTP_PARAM_CHUNKS:
2204 if (!ep->auth_enable)
2207 /* SCTP-AUTH: Section 3.2
2208 * The CHUNKS parameter MUST be included once in the INIT or
2209 * INIT-ACK chunk if the sender wants to receive authenticated
2210 * chunks. Its maximum length is 260 bytes.
2212 if (260 < ntohs(param.p->length)) {
2213 sctp_process_inv_paramlength(asoc, param.p,
2215 retval = SCTP_IERROR_ABORT;
2219 case SCTP_PARAM_HMAC_ALGO:
2220 if (!ep->auth_enable)
2223 hmacs = (struct sctp_hmac_algo_param *)param.p;
2224 n_elt = (ntohs(param.p->length) -
2225 sizeof(struct sctp_paramhdr)) >> 1;
2227 /* SCTP-AUTH: Section 6.1
2228 * The HMAC algorithm based on SHA-1 MUST be supported and
2229 * included in the HMAC-ALGO parameter.
2231 for (i = 0; i < n_elt; i++) {
2232 id = ntohs(hmacs->hmac_ids[i]);
2234 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2238 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2239 sctp_process_inv_paramlength(asoc, param.p, chunk,
2241 retval = SCTP_IERROR_ABORT;
2246 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2247 __func__, ntohs(param.p->type), cid);
2249 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2255 /* Verify the INIT packet before we process it. */
2256 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2257 const struct sctp_association *asoc, enum sctp_cid cid,
2258 struct sctp_init_chunk *peer_init,
2259 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2261 union sctp_params param;
2262 bool has_cookie = false;
2265 /* Check for missing mandatory parameters. Note: Initial TSN is
2266 * also mandatory, but is not checked here since the valid range
2267 * is 0..2**32-1. RFC4960, section 3.3.3.
2269 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2270 peer_init->init_hdr.num_inbound_streams == 0 ||
2271 peer_init->init_hdr.init_tag == 0 ||
2272 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2273 return sctp_process_inv_mandatory(asoc, chunk, errp);
2275 sctp_walk_params(param, peer_init, init_hdr.params) {
2276 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2280 /* There is a possibility that a parameter length was bad and
2281 * in that case we would have stoped walking the parameters.
2282 * The current param.p would point at the bad one.
2283 * Current consensus on the mailing list is to generate a PROTOCOL
2284 * VIOLATION error. We build the ERROR chunk here and let the normal
2285 * error handling code build and send the packet.
2287 if (param.v != (void *)chunk->chunk_end)
2288 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2290 /* The only missing mandatory param possible today is
2291 * the state cookie for an INIT-ACK chunk.
2293 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2294 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2297 /* Verify all the variable length parameters */
2298 sctp_walk_params(param, peer_init, init_hdr.params) {
2299 result = sctp_verify_param(net, ep, asoc, param, cid,
2302 case SCTP_IERROR_ABORT:
2303 case SCTP_IERROR_NOMEM:
2305 case SCTP_IERROR_ERROR:
2307 case SCTP_IERROR_NO_ERROR:
2312 } /* for (loop through all parameters) */
2317 /* Unpack the parameters in an INIT packet into an association.
2318 * Returns 0 on failure, else success.
2319 * FIXME: This is an association method.
2321 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2322 const union sctp_addr *peer_addr,
2323 struct sctp_init_chunk *peer_init, gfp_t gfp)
2325 struct net *net = sock_net(asoc->base.sk);
2326 struct sctp_transport *transport;
2327 struct list_head *pos, *temp;
2328 union sctp_params param;
2329 union sctp_addr addr;
2333 /* We must include the address that the INIT packet came from.
2334 * This is the only address that matters for an INIT packet.
2335 * When processing a COOKIE ECHO, we retrieve the from address
2336 * of the INIT from the cookie.
2339 /* This implementation defaults to making the first transport
2340 * added as the primary transport. The source address seems to
2341 * be a a better choice than any of the embedded addresses.
2343 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2346 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2349 /* Process the initialization parameters. */
2350 sctp_walk_params(param, peer_init, init_hdr.params) {
2352 (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2353 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2354 af = sctp_get_af_specific(param_type2af(param.p->type));
2355 if (!af->from_addr_param(&addr, param.addr,
2356 chunk->sctp_hdr->source, 0))
2358 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2362 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2366 /* source address of chunk may not match any valid address */
2370 /* AUTH: After processing the parameters, make sure that we
2371 * have all the required info to potentially do authentications.
2373 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2374 !asoc->peer.peer_hmacs))
2375 asoc->peer.auth_capable = 0;
2377 /* In a non-backward compatible mode, if the peer claims
2378 * support for ADD-IP but not AUTH, the ADD-IP spec states
2379 * that we MUST ABORT the association. Section 6. The section
2380 * also give us an option to silently ignore the packet, which
2381 * is what we'll do here.
2383 if (!net->sctp.addip_noauth &&
2384 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2385 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2387 SCTP_PARAM_SET_PRIMARY);
2388 asoc->peer.asconf_capable = 0;
2392 /* Walk list of transports, removing transports in the UNKNOWN state. */
2393 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2394 transport = list_entry(pos, struct sctp_transport, transports);
2395 if (transport->state == SCTP_UNKNOWN) {
2396 sctp_assoc_rm_peer(asoc, transport);
2400 /* The fixed INIT headers are always in network byte
2403 asoc->peer.i.init_tag =
2404 ntohl(peer_init->init_hdr.init_tag);
2405 asoc->peer.i.a_rwnd =
2406 ntohl(peer_init->init_hdr.a_rwnd);
2407 asoc->peer.i.num_outbound_streams =
2408 ntohs(peer_init->init_hdr.num_outbound_streams);
2409 asoc->peer.i.num_inbound_streams =
2410 ntohs(peer_init->init_hdr.num_inbound_streams);
2411 asoc->peer.i.initial_tsn =
2412 ntohl(peer_init->init_hdr.initial_tsn);
2414 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2416 /* Apply the upper bounds for output streams based on peer's
2417 * number of inbound streams.
2419 if (asoc->c.sinit_num_ostreams >
2420 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2421 asoc->c.sinit_num_ostreams =
2422 ntohs(peer_init->init_hdr.num_inbound_streams);
2425 if (asoc->c.sinit_max_instreams >
2426 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2427 asoc->c.sinit_max_instreams =
2428 ntohs(peer_init->init_hdr.num_outbound_streams);
2431 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2432 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2434 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2435 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2437 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2438 * high (for example, implementations MAY use the size of the receiver
2439 * advertised window).
2441 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2443 transport->ssthresh = asoc->peer.i.a_rwnd;
2446 /* Set up the TSN tracking pieces. */
2447 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2448 asoc->peer.i.initial_tsn, gfp))
2451 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2453 * The stream sequence number in all the streams shall start
2454 * from 0 when the association is established. Also, when the
2455 * stream sequence number reaches the value 65535 the next
2456 * stream sequence number shall be set to 0.
2459 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2460 asoc->c.sinit_max_instreams, gfp))
2463 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2466 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2468 * When an endpoint has an ASCONF signaled change to be sent to the
2469 * remote endpoint it should do the following:
2471 * A2) A serial number should be assigned to the Chunk. The serial
2472 * number should be a monotonically increasing number. All serial
2473 * numbers are defined to be initialized at the start of the
2474 * association to the same value as the Initial TSN.
2476 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2480 /* Release the transport structures. */
2481 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2482 transport = list_entry(pos, struct sctp_transport, transports);
2483 if (transport->state != SCTP_ACTIVE)
2484 sctp_assoc_rm_peer(asoc, transport);
2492 /* Update asoc with the option described in param.
2494 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2496 * asoc is the association to update.
2497 * param is the variable length parameter to use for update.
2498 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2499 * If the current packet is an INIT we want to minimize the amount of
2500 * work we do. In particular, we should not build transport
2501 * structures for the addresses.
2503 static int sctp_process_param(struct sctp_association *asoc,
2504 union sctp_params param,
2505 const union sctp_addr *peer_addr,
2508 struct net *net = sock_net(asoc->base.sk);
2509 struct sctp_endpoint *ep = asoc->ep;
2510 union sctp_addr_param *addr_param;
2511 struct sctp_transport *t;
2512 enum sctp_scope scope;
2513 union sctp_addr addr;
2519 /* We maintain all INIT parameters in network byte order all the
2520 * time. This allows us to not worry about whether the parameters
2521 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2523 switch (param.p->type) {
2524 case SCTP_PARAM_IPV6_ADDRESS:
2525 if (PF_INET6 != asoc->base.sk->sk_family)
2529 case SCTP_PARAM_IPV4_ADDRESS:
2530 /* v4 addresses are not allowed on v6-only socket */
2531 if (ipv6_only_sock(asoc->base.sk))
2534 af = sctp_get_af_specific(param_type2af(param.p->type));
2535 if (!af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0))
2537 scope = sctp_scope(peer_addr);
2538 if (sctp_in_scope(net, &addr, scope))
2539 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2543 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2544 if (!net->sctp.cookie_preserve_enable)
2547 stale = ntohl(param.life->lifespan_increment);
2549 /* Suggested Cookie Life span increment's unit is msec,
2552 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2555 case SCTP_PARAM_HOST_NAME_ADDRESS:
2556 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2559 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2560 /* Turn off the default values first so we'll know which
2561 * ones are really set by the peer.
2563 asoc->peer.ipv4_address = 0;
2564 asoc->peer.ipv6_address = 0;
2566 /* Assume that peer supports the address family
2567 * by which it sends a packet.
2569 if (peer_addr->sa.sa_family == AF_INET6)
2570 asoc->peer.ipv6_address = 1;
2571 else if (peer_addr->sa.sa_family == AF_INET)
2572 asoc->peer.ipv4_address = 1;
2574 /* Cycle through address types; avoid divide by 0. */
2575 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2577 sat /= sizeof(__u16);
2579 for (i = 0; i < sat; ++i) {
2580 switch (param.sat->types[i]) {
2581 case SCTP_PARAM_IPV4_ADDRESS:
2582 asoc->peer.ipv4_address = 1;
2585 case SCTP_PARAM_IPV6_ADDRESS:
2586 if (PF_INET6 == asoc->base.sk->sk_family)
2587 asoc->peer.ipv6_address = 1;
2590 case SCTP_PARAM_HOST_NAME_ADDRESS:
2591 asoc->peer.hostname_address = 1;
2594 default: /* Just ignore anything else. */
2600 case SCTP_PARAM_STATE_COOKIE:
2601 asoc->peer.cookie_len =
2602 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2603 if (asoc->peer.cookie)
2604 kfree(asoc->peer.cookie);
2605 asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
2606 if (!asoc->peer.cookie)
2610 case SCTP_PARAM_HEARTBEAT_INFO:
2611 /* Would be odd to receive, but it causes no problems. */
2614 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2615 /* Rejected during verify stage. */
2618 case SCTP_PARAM_ECN_CAPABLE:
2619 asoc->peer.ecn_capable = 1;
2622 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2623 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2626 case SCTP_PARAM_SET_PRIMARY:
2627 if (!net->sctp.addip_enable)
2630 addr_param = param.v + sizeof(struct sctp_addip_param);
2632 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2636 if (!af->from_addr_param(&addr, addr_param,
2637 htons(asoc->peer.port), 0))
2640 if (!af->addr_valid(&addr, NULL, NULL))
2643 t = sctp_assoc_lookup_paddr(asoc, &addr);
2647 sctp_assoc_set_primary(asoc, t);
2650 case SCTP_PARAM_SUPPORTED_EXT:
2651 sctp_process_ext_param(asoc, param);
2654 case SCTP_PARAM_FWD_TSN_SUPPORT:
2655 if (asoc->prsctp_enable) {
2656 asoc->peer.prsctp_capable = 1;
2662 case SCTP_PARAM_RANDOM:
2663 if (!ep->auth_enable)
2666 /* Save peer's random parameter */
2667 if (asoc->peer.peer_random)
2668 kfree(asoc->peer.peer_random);
2669 asoc->peer.peer_random = kmemdup(param.p,
2670 ntohs(param.p->length), gfp);
2671 if (!asoc->peer.peer_random) {
2677 case SCTP_PARAM_HMAC_ALGO:
2678 if (!ep->auth_enable)
2681 /* Save peer's HMAC list */
2682 if (asoc->peer.peer_hmacs)
2683 kfree(asoc->peer.peer_hmacs);
2684 asoc->peer.peer_hmacs = kmemdup(param.p,
2685 ntohs(param.p->length), gfp);
2686 if (!asoc->peer.peer_hmacs) {
2691 /* Set the default HMAC the peer requested*/
2692 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2695 case SCTP_PARAM_CHUNKS:
2696 if (!ep->auth_enable)
2699 if (asoc->peer.peer_chunks)
2700 kfree(asoc->peer.peer_chunks);
2701 asoc->peer.peer_chunks = kmemdup(param.p,
2702 ntohs(param.p->length), gfp);
2703 if (!asoc->peer.peer_chunks)
2708 /* Any unrecognized parameters should have been caught
2709 * and handled by sctp_verify_param() which should be
2710 * called prior to this routine. Simply log the error
2713 pr_debug("%s: ignoring param:%d for association:%p.\n",
2714 __func__, ntohs(param.p->type), asoc);
2721 /* Select a new verification tag. */
2722 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2724 /* I believe that this random number generator complies with RFC1750.
2725 * A tag of 0 is reserved for special cases (e.g. INIT).
2730 get_random_bytes(&x, sizeof(__u32));
2736 /* Select an initial TSN to send during startup. */
2737 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2741 get_random_bytes(&retval, sizeof(__u32));
2746 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2748 * 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
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | Address Parameter |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2756 * | ASCONF Parameter #1 |
2757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2762 * | ASCONF Parameter #N |
2763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2765 * Address Parameter and other parameter will not be wrapped in this function
2767 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2768 union sctp_addr *addr,
2771 struct sctp_addiphdr asconf;
2772 struct sctp_chunk *retval;
2773 int length = sizeof(asconf) + vparam_len;
2774 union sctp_addr_param addrparam;
2776 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2778 addrlen = af->to_addr_param(addr, &addrparam);
2783 /* Create the chunk. */
2784 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2789 asconf.serial = htonl(asoc->addip_serial++);
2791 retval->subh.addip_hdr =
2792 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2793 retval->param_hdr.v =
2794 sctp_addto_chunk(retval, addrlen, &addrparam);
2800 * 3.2.1 Add IP Address
2802 * 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
2803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2804 * | Type = 0xC001 | Length = Variable |
2805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2806 * | ASCONF-Request Correlation ID |
2807 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2808 * | Address Parameter |
2809 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2811 * 3.2.2 Delete IP Address
2813 * 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
2814 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2815 * | Type = 0xC002 | Length = Variable |
2816 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2817 * | ASCONF-Request Correlation ID |
2818 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2819 * | Address Parameter |
2820 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2823 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2824 union sctp_addr *laddr,
2825 struct sockaddr *addrs,
2826 int addrcnt, __be16 flags)
2828 union sctp_addr_param addr_param;
2829 struct sctp_addip_param param;
2830 int paramlen = sizeof(param);
2831 struct sctp_chunk *retval;
2832 int addr_param_len = 0;
2833 union sctp_addr *addr;
2834 int totallen = 0, i;
2839 /* Get total length of all the address parameters. */
2841 for (i = 0; i < addrcnt; i++) {
2843 af = sctp_get_af_specific(addr->v4.sin_family);
2844 addr_param_len = af->to_addr_param(addr, &addr_param);
2846 totallen += paramlen;
2847 totallen += addr_param_len;
2849 addr_buf += af->sockaddr_len;
2850 if (asoc->asconf_addr_del_pending && !del_pickup) {
2851 /* reuse the parameter length from the same scope one */
2852 totallen += paramlen;
2853 totallen += addr_param_len;
2856 pr_debug("%s: picked same-scope del_pending addr, "
2857 "totallen for all addresses is %d\n",
2858 __func__, totallen);
2862 /* Create an asconf chunk with the required length. */
2863 retval = sctp_make_asconf(asoc, laddr, totallen);
2867 /* Add the address parameters to the asconf chunk. */
2869 for (i = 0; i < addrcnt; i++) {
2871 af = sctp_get_af_specific(addr->v4.sin_family);
2872 addr_param_len = af->to_addr_param(addr, &addr_param);
2873 param.param_hdr.type = flags;
2874 param.param_hdr.length = htons(paramlen + addr_param_len);
2875 param.crr_id = htonl(i);
2877 sctp_addto_chunk(retval, paramlen, ¶m);
2878 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2880 addr_buf += af->sockaddr_len;
2882 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2883 addr = asoc->asconf_addr_del_pending;
2884 af = sctp_get_af_specific(addr->v4.sin_family);
2885 addr_param_len = af->to_addr_param(addr, &addr_param);
2886 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2887 param.param_hdr.length = htons(paramlen + addr_param_len);
2888 param.crr_id = htonl(i);
2890 sctp_addto_chunk(retval, paramlen, ¶m);
2891 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2897 * 3.2.4 Set Primary IP Address
2899 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2900 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2901 * | Type =0xC004 | Length = Variable |
2902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2903 * | ASCONF-Request Correlation ID |
2904 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2905 * | Address Parameter |
2906 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2908 * Create an ASCONF chunk with Set Primary IP address parameter.
2910 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2911 union sctp_addr *addr)
2913 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2914 union sctp_addr_param addrparam;
2915 struct sctp_addip_param param;
2916 struct sctp_chunk *retval;
2917 int len = sizeof(param);
2920 addrlen = af->to_addr_param(addr, &addrparam);
2925 /* Create the chunk and make asconf header. */
2926 retval = sctp_make_asconf(asoc, addr, len);
2930 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2931 param.param_hdr.length = htons(len);
2934 sctp_addto_chunk(retval, sizeof(param), ¶m);
2935 sctp_addto_chunk(retval, addrlen, &addrparam);
2940 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2942 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * | Type = 0x80 | Chunk Flags | Chunk Length |
2945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2948 * | ASCONF Parameter Response#1 |
2949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2954 * | ASCONF Parameter Response#N |
2955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2957 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2959 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2960 __u32 serial, int vparam_len)
2962 struct sctp_addiphdr asconf;
2963 struct sctp_chunk *retval;
2964 int length = sizeof(asconf) + vparam_len;
2966 /* Create the chunk. */
2967 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2972 asconf.serial = htonl(serial);
2974 retval->subh.addip_hdr =
2975 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2980 /* Add response parameters to an ASCONF_ACK chunk. */
2981 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2983 struct sctp_addip_param *asconf_param)
2985 struct sctp_addip_param ack_param;
2986 struct sctp_errhdr err_param;
2987 int asconf_param_len = 0;
2988 int err_param_len = 0;
2989 __be16 response_type;
2991 if (SCTP_ERROR_NO_ERROR == err_code) {
2992 response_type = SCTP_PARAM_SUCCESS_REPORT;
2994 response_type = SCTP_PARAM_ERR_CAUSE;
2995 err_param_len = sizeof(err_param);
2998 ntohs(asconf_param->param_hdr.length);
3001 /* Add Success Indication or Error Cause Indication parameter. */
3002 ack_param.param_hdr.type = response_type;
3003 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3006 ack_param.crr_id = crr_id;
3007 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3009 if (SCTP_ERROR_NO_ERROR == err_code)
3012 /* Add Error Cause parameter. */
3013 err_param.cause = err_code;
3014 err_param.length = htons(err_param_len + asconf_param_len);
3015 sctp_addto_chunk(chunk, err_param_len, &err_param);
3017 /* Add the failed TLV copied from ASCONF chunk. */
3019 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3022 /* Process a asconf parameter. */
3023 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3024 struct sctp_chunk *asconf,
3025 struct sctp_addip_param *asconf_param)
3027 union sctp_addr_param *addr_param;
3028 struct sctp_transport *peer;
3029 union sctp_addr addr;
3032 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3034 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3035 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3036 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3037 return SCTP_ERROR_UNKNOWN_PARAM;
3039 switch (addr_param->p.type) {
3040 case SCTP_PARAM_IPV6_ADDRESS:
3041 if (!asoc->peer.ipv6_address)
3042 return SCTP_ERROR_DNS_FAILED;
3044 case SCTP_PARAM_IPV4_ADDRESS:
3045 if (!asoc->peer.ipv4_address)
3046 return SCTP_ERROR_DNS_FAILED;
3049 return SCTP_ERROR_DNS_FAILED;
3052 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3054 return SCTP_ERROR_DNS_FAILED;
3056 if (!af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0))
3057 return SCTP_ERROR_DNS_FAILED;
3059 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3060 * or multicast address.
3061 * (note: wildcard is permitted and requires special handling so
3062 * make sure we check for that)
3064 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3065 return SCTP_ERROR_DNS_FAILED;
3067 switch (asconf_param->param_hdr.type) {
3068 case SCTP_PARAM_ADD_IP:
3070 * If the address 0.0.0.0 or ::0 is provided, the source
3071 * address of the packet MUST be added.
3073 if (af->is_any(&addr))
3074 memcpy(&addr, &asconf->source, sizeof(addr));
3076 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3077 * request and does not have the local resources to add this
3078 * new address to the association, it MUST return an Error
3079 * Cause TLV set to the new error code 'Operation Refused
3080 * Due to Resource Shortage'.
3083 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3085 return SCTP_ERROR_RSRC_LOW;
3087 /* Start the heartbeat timer. */
3088 sctp_transport_reset_hb_timer(peer);
3089 asoc->new_transport = peer;
3091 case SCTP_PARAM_DEL_IP:
3092 /* ADDIP 4.3 D7) If a request is received to delete the
3093 * last remaining IP address of a peer endpoint, the receiver
3094 * MUST send an Error Cause TLV with the error cause set to the
3095 * new error code 'Request to Delete Last Remaining IP Address'.
3097 if (asoc->peer.transport_count == 1)
3098 return SCTP_ERROR_DEL_LAST_IP;
3100 /* ADDIP 4.3 D8) If a request is received to delete an IP
3101 * address which is also the source address of the IP packet
3102 * which contained the ASCONF chunk, the receiver MUST reject
3103 * this request. To reject the request the receiver MUST send
3104 * an Error Cause TLV set to the new error code 'Request to
3105 * Delete Source IP Address'
3107 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3108 return SCTP_ERROR_DEL_SRC_IP;
3111 * If the address 0.0.0.0 or ::0 is provided, all
3112 * addresses of the peer except the source address of the
3113 * packet MUST be deleted.
3115 if (af->is_any(&addr)) {
3116 sctp_assoc_set_primary(asoc, asconf->transport);
3117 sctp_assoc_del_nonprimary_peers(asoc,
3119 return SCTP_ERROR_NO_ERROR;
3122 /* If the address is not part of the association, the
3123 * ASCONF-ACK with Error Cause Indication Parameter
3124 * which including cause of Unresolvable Address should
3127 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3129 return SCTP_ERROR_DNS_FAILED;
3131 sctp_assoc_rm_peer(asoc, peer);
3133 case SCTP_PARAM_SET_PRIMARY:
3134 /* ADDIP Section 4.2.4
3135 * If the address 0.0.0.0 or ::0 is provided, the receiver
3136 * MAY mark the source address of the packet as its
3139 if (af->is_any(&addr))
3140 memcpy(&addr, sctp_source(asconf), sizeof(addr));
3142 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3144 return SCTP_ERROR_DNS_FAILED;
3146 sctp_assoc_set_primary(asoc, peer);
3150 return SCTP_ERROR_NO_ERROR;
3153 /* Verify the ASCONF packet before we process it. */
3154 bool sctp_verify_asconf(const struct sctp_association *asoc,
3155 struct sctp_chunk *chunk, bool addr_param_needed,
3156 struct sctp_paramhdr **errp)
3158 struct sctp_addip_chunk *addip;
3159 bool addr_param_seen = false;
3160 union sctp_params param;
3162 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3163 sctp_walk_params(param, addip, addip_hdr.params) {
3164 size_t length = ntohs(param.p->length);
3167 switch (param.p->type) {
3168 case SCTP_PARAM_ERR_CAUSE:
3170 case SCTP_PARAM_IPV4_ADDRESS:
3171 if (length != sizeof(struct sctp_ipv4addr_param))
3173 /* ensure there is only one addr param and it's in the
3174 * beginning of addip_hdr params, or we reject it.
3176 if (param.v != addip->addip_hdr.params)
3178 addr_param_seen = true;
3180 case SCTP_PARAM_IPV6_ADDRESS:
3181 if (length != sizeof(struct sctp_ipv6addr_param))
3183 if (param.v != addip->addip_hdr.params)
3185 addr_param_seen = true;
3187 case SCTP_PARAM_ADD_IP:
3188 case SCTP_PARAM_DEL_IP:
3189 case SCTP_PARAM_SET_PRIMARY:
3190 /* In ASCONF chunks, these need to be first. */
3191 if (addr_param_needed && !addr_param_seen)
3193 length = ntohs(param.addip->param_hdr.length);
3194 if (length < sizeof(struct sctp_addip_param) +
3198 case SCTP_PARAM_SUCCESS_REPORT:
3199 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3200 if (length != sizeof(struct sctp_addip_param))
3204 /* This is unkown to us, reject! */
3209 /* Remaining sanity checks. */
3210 if (addr_param_needed && !addr_param_seen)
3212 if (!addr_param_needed && addr_param_seen)
3214 if (param.v != chunk->chunk_end)
3220 /* Process an incoming ASCONF chunk with the next expected serial no. and
3221 * return an ASCONF_ACK chunk to be sent in response.
3223 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3224 struct sctp_chunk *asconf)
3226 union sctp_addr_param *addr_param;
3227 struct sctp_addip_chunk *addip;
3228 struct sctp_chunk *asconf_ack;
3229 bool all_param_pass = true;
3230 struct sctp_addiphdr *hdr;
3231 int length = 0, chunk_len;
3232 union sctp_params param;
3236 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3237 chunk_len = ntohs(asconf->chunk_hdr->length) -
3238 sizeof(struct sctp_chunkhdr);
3239 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3240 serial = ntohl(hdr->serial);
3242 /* Skip the addiphdr and store a pointer to address parameter. */
3243 length = sizeof(*hdr);
3244 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3245 chunk_len -= length;
3247 /* Skip the address parameter and store a pointer to the first
3250 length = ntohs(addr_param->p.length);
3251 chunk_len -= length;
3253 /* create an ASCONF_ACK chunk.
3254 * Based on the definitions of parameters, we know that the size of
3255 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3258 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3262 /* Process the TLVs contained within the ASCONF chunk. */
3263 sctp_walk_params(param, addip, addip_hdr.params) {
3264 /* Skip preceeding address parameters. */
3265 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3266 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3269 err_code = sctp_process_asconf_param(asoc, asconf,
3272 * If an error response is received for a TLV parameter,
3273 * all TLVs with no response before the failed TLV are
3274 * considered successful if not reported. All TLVs after
3275 * the failed response are considered unsuccessful unless
3276 * a specific success indication is present for the parameter.
3278 if (err_code != SCTP_ERROR_NO_ERROR)
3279 all_param_pass = false;
3280 if (!all_param_pass)
3281 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3282 err_code, param.addip);
3284 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3285 * an IP address sends an 'Out of Resource' in its response, it
3286 * MUST also fail any subsequent add or delete requests bundled
3289 if (err_code == SCTP_ERROR_RSRC_LOW)
3293 asoc->peer.addip_serial++;
3295 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3296 * after freeing the reference to old asconf ack if any.
3299 sctp_chunk_hold(asconf_ack);
3300 list_add_tail(&asconf_ack->transmitted_list,
3301 &asoc->asconf_ack_list);
3307 /* Process a asconf parameter that is successfully acked. */
3308 static void sctp_asconf_param_success(struct sctp_association *asoc,
3309 struct sctp_addip_param *asconf_param)
3311 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3312 union sctp_addr_param *addr_param;
3313 struct sctp_sockaddr_entry *saddr;
3314 struct sctp_transport *transport;
3315 union sctp_addr addr;
3318 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3320 /* We have checked the packet before, so we do not check again. */
3321 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3322 if (!af->from_addr_param(&addr, addr_param, htons(bp->port), 0))
3325 switch (asconf_param->param_hdr.type) {
3326 case SCTP_PARAM_ADD_IP:
3327 /* This is always done in BH context with a socket lock
3328 * held, so the list can not change.
3331 list_for_each_entry(saddr, &bp->address_list, list) {
3332 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3333 saddr->state = SCTP_ADDR_SRC;
3336 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3338 sctp_transport_dst_release(transport);
3341 case SCTP_PARAM_DEL_IP:
3343 sctp_del_bind_addr(bp, &addr);
3344 if (asoc->asconf_addr_del_pending != NULL &&
3345 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3346 kfree(asoc->asconf_addr_del_pending);
3347 asoc->asconf_addr_del_pending = NULL;
3350 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3352 sctp_transport_dst_release(transport);
3360 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3361 * for the given asconf parameter. If there is no response for this parameter,
3362 * return the error code based on the third argument 'no_err'.
3364 * A7) If an error response is received for a TLV parameter, all TLVs with no
3365 * response before the failed TLV are considered successful if not reported.
3366 * All TLVs after the failed response are considered unsuccessful unless a
3367 * specific success indication is present for the parameter.
3369 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3370 struct sctp_addip_param *asconf_param,
3373 struct sctp_addip_param *asconf_ack_param;
3374 struct sctp_errhdr *err_param;
3380 err_code = SCTP_ERROR_NO_ERROR;
3382 err_code = SCTP_ERROR_REQ_REFUSED;
3384 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3385 sizeof(struct sctp_chunkhdr);
3387 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3388 * the first asconf_ack parameter.
3390 length = sizeof(struct sctp_addiphdr);
3391 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3393 asconf_ack_len -= length;
3395 while (asconf_ack_len > 0) {
3396 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3397 switch (asconf_ack_param->param_hdr.type) {
3398 case SCTP_PARAM_SUCCESS_REPORT:
3399 return SCTP_ERROR_NO_ERROR;
3400 case SCTP_PARAM_ERR_CAUSE:
3401 length = sizeof(*asconf_ack_param);
3402 err_param = (void *)asconf_ack_param + length;
3403 asconf_ack_len -= length;
3404 if (asconf_ack_len > 0)
3405 return err_param->cause;
3407 return SCTP_ERROR_INV_PARAM;
3410 return SCTP_ERROR_INV_PARAM;
3414 length = ntohs(asconf_ack_param->param_hdr.length);
3415 asconf_ack_param = (void *)asconf_ack_param + length;
3416 asconf_ack_len -= length;
3422 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3423 int sctp_process_asconf_ack(struct sctp_association *asoc,
3424 struct sctp_chunk *asconf_ack)
3426 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3427 struct sctp_addip_param *asconf_param;
3428 __be16 err_code = SCTP_ERROR_NO_ERROR;
3429 union sctp_addr_param *addr_param;
3430 int asconf_len = asconf->skb->len;
3431 int all_param_pass = 0;
3436 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3437 * a pointer to address parameter.
3439 length = sizeof(struct sctp_addip_chunk);
3440 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3441 asconf_len -= length;
3443 /* Skip the address parameter in the last asconf sent and store a
3444 * pointer to the first asconf parameter.
3446 length = ntohs(addr_param->p.length);
3447 asconf_param = (void *)addr_param + length;
3448 asconf_len -= length;
3451 * A8) If there is no response(s) to specific TLV parameter(s), and no
3452 * failures are indicated, then all request(s) are considered
3455 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3458 /* Process the TLVs contained in the last sent ASCONF chunk. */
3459 while (asconf_len > 0) {
3461 err_code = SCTP_ERROR_NO_ERROR;
3463 err_code = sctp_get_asconf_response(asconf_ack,
3466 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3471 case SCTP_ERROR_NO_ERROR:
3472 sctp_asconf_param_success(asoc, asconf_param);
3475 case SCTP_ERROR_RSRC_LOW:
3479 case SCTP_ERROR_UNKNOWN_PARAM:
3480 /* Disable sending this type of asconf parameter in
3483 asoc->peer.addip_disabled_mask |=
3484 asconf_param->param_hdr.type;
3487 case SCTP_ERROR_REQ_REFUSED:
3488 case SCTP_ERROR_DEL_LAST_IP:
3489 case SCTP_ERROR_DEL_SRC_IP:
3494 /* Skip the processed asconf parameter and move to the next
3497 length = ntohs(asconf_param->param_hdr.length);
3498 asconf_param = (void *)asconf_param + length;
3499 asconf_len -= length;
3502 if (no_err && asoc->src_out_of_asoc_ok) {
3503 asoc->src_out_of_asoc_ok = 0;
3504 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3507 /* Free the cached last sent asconf chunk. */
3508 list_del_init(&asconf->transmitted_list);
3509 sctp_chunk_free(asconf);
3510 asoc->addip_last_asconf = NULL;
3515 /* Make a FWD TSN chunk. */
3516 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3517 __u32 new_cum_tsn, size_t nstreams,
3518 struct sctp_fwdtsn_skip *skiplist)
3520 struct sctp_chunk *retval = NULL;
3521 struct sctp_fwdtsn_hdr ftsn_hdr;
3522 struct sctp_fwdtsn_skip skip;
3526 hint = (nstreams + 1) * sizeof(__u32);
3528 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3533 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3534 retval->subh.fwdtsn_hdr =
3535 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3537 for (i = 0; i < nstreams; i++) {
3538 skip.stream = skiplist[i].stream;
3539 skip.ssn = skiplist[i].ssn;
3540 sctp_addto_chunk(retval, sizeof(skip), &skip);
3546 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3548 * 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
3549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3550 * | Type = 130 | Chunk Flags | Chunk Length |
3551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3553 * / Re-configuration Parameter /
3555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3557 * / Re-configuration Parameter (optional) /
3559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3561 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3564 struct sctp_reconf_chunk *reconf;
3565 struct sctp_chunk *retval;
3567 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3572 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3573 retval->param_hdr.v = reconf->params;
3578 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3580 * 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
3581 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3582 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3584 * | Re-configuration Request Sequence Number |
3585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3586 * | Re-configuration Response Sequence Number |
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * | Sender's Last Assigned TSN |
3589 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3590 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3591 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3593 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3594 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3595 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3597 * RE-CONFIG 4.2 (STREAM IN RESET)
3599 * 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
3600 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3601 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3602 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3603 * | Re-configuration Request Sequence Number |
3604 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3605 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3606 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3609 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3612 struct sctp_chunk *sctp_make_strreset_req(
3613 const struct sctp_association *asoc,
3614 __u16 stream_num, __be16 *stream_list,
3617 struct sctp_strreset_outreq outreq;
3618 __u16 stream_len = stream_num * 2;
3619 struct sctp_strreset_inreq inreq;
3620 struct sctp_chunk *retval;
3621 __u16 outlen, inlen;
3623 outlen = (sizeof(outreq) + stream_len) * out;
3624 inlen = (sizeof(inreq) + stream_len) * in;
3626 retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
3631 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3632 outreq.param_hdr.length = htons(outlen);
3633 outreq.request_seq = htonl(asoc->strreset_outseq);
3634 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3635 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3637 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3640 sctp_addto_chunk(retval, stream_len, stream_list);
3644 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3645 inreq.param_hdr.length = htons(inlen);
3646 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3648 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3651 sctp_addto_chunk(retval, stream_len, stream_list);
3657 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3659 * 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
3660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3661 * | Parameter Type = 15 | Parameter Length = 8 |
3662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3663 * | Re-configuration Request Sequence Number |
3664 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3666 struct sctp_chunk *sctp_make_strreset_tsnreq(
3667 const struct sctp_association *asoc)
3669 struct sctp_strreset_tsnreq tsnreq;
3670 __u16 length = sizeof(tsnreq);
3671 struct sctp_chunk *retval;
3673 retval = sctp_make_reconf(asoc, length);
3677 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3678 tsnreq.param_hdr.length = htons(length);
3679 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3681 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3686 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3688 * 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
3689 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3690 * | Parameter Type = 17 | Parameter Length = 12 |
3691 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3692 * | Re-configuration Request Sequence Number |
3693 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3694 * | Number of new streams | Reserved |
3695 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3697 struct sctp_chunk *sctp_make_strreset_addstrm(
3698 const struct sctp_association *asoc,
3699 __u16 out, __u16 in)
3701 struct sctp_strreset_addstrm addstrm;
3702 __u16 size = sizeof(addstrm);
3703 struct sctp_chunk *retval;
3705 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3710 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3711 addstrm.param_hdr.length = htons(size);
3712 addstrm.number_of_streams = htons(out);
3713 addstrm.request_seq = htonl(asoc->strreset_outseq);
3714 addstrm.reserved = 0;
3716 sctp_addto_chunk(retval, size, &addstrm);
3720 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3721 addstrm.param_hdr.length = htons(size);
3722 addstrm.number_of_streams = htons(in);
3723 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3724 addstrm.reserved = 0;
3726 sctp_addto_chunk(retval, size, &addstrm);
3732 /* RE-CONFIG 4.4 (RESP)
3734 * 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
3735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3736 * | Parameter Type = 16 | Parameter Length |
3737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3738 * | Re-configuration Response Sequence Number |
3739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3743 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3744 __u32 result, __u32 sn)
3746 struct sctp_strreset_resp resp;
3747 __u16 length = sizeof(resp);
3748 struct sctp_chunk *retval;
3750 retval = sctp_make_reconf(asoc, length);
3754 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3755 resp.param_hdr.length = htons(length);
3756 resp.response_seq = htonl(sn);
3757 resp.result = htonl(result);
3759 sctp_addto_chunk(retval, sizeof(resp), &resp);
3764 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3766 * 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
3767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3768 * | Parameter Type = 16 | Parameter Length |
3769 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3770 * | Re-configuration Response Sequence Number |
3771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3773 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3774 * | Sender's Next TSN (optional) |
3775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3776 * | Receiver's Next TSN (optional) |
3777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3779 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3780 __u32 result, __u32 sn,
3784 struct sctp_strreset_resptsn tsnresp;
3785 __u16 length = sizeof(tsnresp);
3786 struct sctp_chunk *retval;
3788 retval = sctp_make_reconf(asoc, length);
3792 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3793 tsnresp.param_hdr.length = htons(length);
3795 tsnresp.response_seq = htonl(sn);
3796 tsnresp.result = htonl(result);
3797 tsnresp.senders_next_tsn = htonl(sender_tsn);
3798 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3800 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3805 bool sctp_verify_reconf(const struct sctp_association *asoc,
3806 struct sctp_chunk *chunk,
3807 struct sctp_paramhdr **errp)
3809 struct sctp_reconf_chunk *hdr;
3810 union sctp_params param;
3814 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3815 sctp_walk_params(param, hdr, params) {
3816 __u16 length = ntohs(param.p->length);
3821 switch (param.p->type) {
3822 case SCTP_PARAM_RESET_OUT_REQUEST:
3823 if (length < sizeof(struct sctp_strreset_outreq) ||
3824 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3825 last != SCTP_PARAM_RESET_IN_REQUEST))
3828 case SCTP_PARAM_RESET_IN_REQUEST:
3829 if (length < sizeof(struct sctp_strreset_inreq) ||
3830 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3833 case SCTP_PARAM_RESET_RESPONSE:
3834 if ((length != sizeof(struct sctp_strreset_resp) &&
3835 length != sizeof(struct sctp_strreset_resptsn)) ||
3836 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3837 last != SCTP_PARAM_RESET_OUT_REQUEST))
3840 case SCTP_PARAM_RESET_TSN_REQUEST:
3842 sizeof(struct sctp_strreset_tsnreq) || last)
3845 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3846 if (length != sizeof(struct sctp_strreset_addstrm) ||
3847 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3850 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3851 if (length != sizeof(struct sctp_strreset_addstrm) ||
3852 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3859 last = param.p->type;