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,
85 /* Control chunk destructor */
86 static void sctp_control_release_owner(struct sk_buff *skb)
88 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
91 struct sctp_shared_key *shkey = chunk->shkey;
92 struct sctp_association *asoc = chunk->asoc;
94 /* refcnt == 2 and !list_empty mean after this release, it's
95 * not being used anywhere, and it's time to notify userland
96 * that this shkey can be freed if it's been deactivated.
98 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
99 refcount_read(&shkey->refcnt) == 2) {
100 struct sctp_ulpevent *ev;
102 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
106 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
108 sctp_auth_shkey_release(chunk->shkey);
112 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
114 struct sctp_association *asoc = chunk->asoc;
115 struct sk_buff *skb = chunk->skb;
117 /* TODO: properly account for control chunks.
118 * To do it right we'll need:
119 * 1) endpoint if association isn't known.
120 * 2) proper memory accounting.
122 * For now don't do anything for now.
125 chunk->shkey = asoc->shkey;
126 sctp_auth_shkey_hold(chunk->shkey);
128 skb->sk = asoc ? asoc->base.sk : NULL;
129 skb_shinfo(skb)->destructor_arg = chunk;
130 skb->destructor = sctp_control_release_owner;
133 /* What was the inbound interface for this chunk? */
134 int sctp_chunk_iif(const struct sctp_chunk *chunk)
136 struct sk_buff *skb = chunk->skb;
138 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
141 /* RFC 2960 3.3.2 Initiation (INIT) (1)
143 * Note 2: The ECN capable field is reserved for future use of
144 * Explicit Congestion Notification.
146 static const struct sctp_paramhdr ecap_param = {
147 SCTP_PARAM_ECN_CAPABLE,
148 cpu_to_be16(sizeof(struct sctp_paramhdr)),
150 static const struct sctp_paramhdr prsctp_param = {
151 SCTP_PARAM_FWD_TSN_SUPPORT,
152 cpu_to_be16(sizeof(struct sctp_paramhdr)),
155 /* A helper to initialize an op error inside a provided chunk, as most
156 * cause codes will be embedded inside an abort chunk.
158 int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
161 struct sctp_errhdr err;
164 /* Cause code constants are now defined in network order. */
165 err.cause = cause_code;
166 len = sizeof(err) + paylen;
167 err.length = htons(len);
169 if (skb_tailroom(chunk->skb) < len)
172 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
177 /* 3.3.2 Initiation (INIT) (1)
179 * This chunk is used to initiate a SCTP association between two
180 * endpoints. The format of the INIT chunk is shown below:
183 * 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
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Type = 1 | Chunk Flags | Chunk Length |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * | Advertised Receiver Window Credit (a_rwnd) |
190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
191 * | Number of Outbound Streams | Number of Inbound Streams |
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
196 * / Optional/Variable-Length Parameters /
198 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
201 * The INIT chunk contains the following parameters. Unless otherwise
202 * noted, each parameter MUST only be included once in the INIT chunk.
204 * Fixed Parameters Status
205 * ----------------------------------------------
206 * Initiate Tag Mandatory
207 * Advertised Receiver Window Credit Mandatory
208 * Number of Outbound Streams Mandatory
209 * Number of Inbound Streams Mandatory
210 * Initial TSN Mandatory
212 * Variable Parameters Status Type Value
213 * -------------------------------------------------------------
214 * IPv4 Address (Note 1) Optional 5
215 * IPv6 Address (Note 1) Optional 6
216 * Cookie Preservative Optional 9
217 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
218 * Host Name Address (Note 3) Optional 11
219 * Supported Address Types (Note 4) Optional 12
221 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
222 const struct sctp_bind_addr *bp,
223 gfp_t gfp, int vparam_len)
225 struct net *net = sock_net(asoc->base.sk);
226 struct sctp_supported_ext_param ext_param;
227 struct sctp_adaptation_ind_param aiparam;
228 struct sctp_paramhdr *auth_chunks = NULL;
229 struct sctp_paramhdr *auth_hmacs = NULL;
230 struct sctp_supported_addrs_param sat;
231 struct sctp_endpoint *ep = asoc->ep;
232 struct sctp_chunk *retval = NULL;
233 int num_types, addrs_len = 0;
234 struct sctp_inithdr init;
235 union sctp_params addrs;
236 struct sctp_sock *sp;
242 /* RFC 2960 3.3.2 Initiation (INIT) (1)
244 * Note 1: The INIT chunks can contain multiple addresses that
245 * can be IPv4 and/or IPv6 in any combination.
248 /* Convert the provided bind address list to raw format. */
249 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
251 init.init_tag = htonl(asoc->c.my_vtag);
252 init.a_rwnd = htonl(asoc->rwnd);
253 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
254 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
255 init.initial_tsn = htonl(asoc->c.initial_tsn);
257 /* How many address types are needed? */
258 sp = sctp_sk(asoc->base.sk);
259 num_types = sp->pf->supported_addrs(sp, types);
261 chunksize = sizeof(init) + addrs_len;
262 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
263 chunksize += sizeof(ecap_param);
265 if (asoc->prsctp_enable)
266 chunksize += sizeof(prsctp_param);
268 /* ADDIP: Section 4.2.7:
269 * An implementation supporting this extension [ADDIP] MUST list
270 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
271 * INIT-ACK parameters.
273 if (net->sctp.addip_enable) {
274 extensions[num_ext] = SCTP_CID_ASCONF;
275 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
279 if (asoc->reconf_enable) {
280 extensions[num_ext] = SCTP_CID_RECONF;
284 if (sp->adaptation_ind)
285 chunksize += sizeof(aiparam);
287 if (sp->strm_interleave) {
288 extensions[num_ext] = SCTP_CID_I_DATA;
292 chunksize += vparam_len;
294 /* Account for AUTH related parameters */
295 if (ep->auth_enable) {
296 /* Add random parameter length*/
297 chunksize += sizeof(asoc->c.auth_random);
299 /* Add HMACS parameter length if any were defined */
300 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
301 if (auth_hmacs->length)
302 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
306 /* Add CHUNKS parameter length */
307 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
308 if (auth_chunks->length)
309 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
313 extensions[num_ext] = SCTP_CID_AUTH;
317 /* If we have any extensions to report, account for that */
319 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
321 /* RFC 2960 3.3.2 Initiation (INIT) (1)
323 * Note 3: An INIT chunk MUST NOT contain more than one Host
324 * Name address parameter. Moreover, the sender of the INIT
325 * MUST NOT combine any other address types with the Host Name
326 * address in the INIT. The receiver of INIT MUST ignore any
327 * other address types if the Host Name address parameter is
328 * present in the received INIT chunk.
330 * PLEASE DO NOT FIXME [This version does not support Host Name.]
333 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
337 retval->subh.init_hdr =
338 sctp_addto_chunk(retval, sizeof(init), &init);
339 retval->param_hdr.v =
340 sctp_addto_chunk(retval, addrs_len, addrs.v);
342 /* RFC 2960 3.3.2 Initiation (INIT) (1)
344 * Note 4: This parameter, when present, specifies all the
345 * address types the sending endpoint can support. The absence
346 * of this parameter indicates that the sending endpoint can
347 * support any address type.
349 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
350 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
351 sctp_addto_chunk(retval, sizeof(sat), &sat);
352 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
354 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
356 /* Add the supported extensions parameter. Be nice and add this
357 * fist before addiding the parameters for the extensions themselves
360 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
361 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
362 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
363 sctp_addto_param(retval, num_ext, extensions);
366 if (asoc->prsctp_enable)
367 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
369 if (sp->adaptation_ind) {
370 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
371 aiparam.param_hdr.length = htons(sizeof(aiparam));
372 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
373 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
376 /* Add SCTP-AUTH chunks to the parameter list */
377 if (ep->auth_enable) {
378 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
379 asoc->c.auth_random);
381 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
384 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
392 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
393 const struct sctp_chunk *chunk,
394 gfp_t gfp, int unkparam_len)
396 struct sctp_supported_ext_param ext_param;
397 struct sctp_adaptation_ind_param aiparam;
398 struct sctp_paramhdr *auth_chunks = NULL;
399 struct sctp_paramhdr *auth_random = NULL;
400 struct sctp_paramhdr *auth_hmacs = NULL;
401 struct sctp_chunk *retval = NULL;
402 struct sctp_cookie_param *cookie;
403 struct sctp_inithdr initack;
404 union sctp_params addrs;
405 struct sctp_sock *sp;
412 /* Note: there may be no addresses to embed. */
413 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
415 initack.init_tag = htonl(asoc->c.my_vtag);
416 initack.a_rwnd = htonl(asoc->rwnd);
417 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
418 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
419 initack.initial_tsn = htonl(asoc->c.initial_tsn);
421 /* FIXME: We really ought to build the cookie right
422 * into the packet instead of allocating more fresh memory.
424 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
429 /* Calculate the total size of allocation, include the reserved
430 * space for reporting unknown parameters if it is specified.
432 sp = sctp_sk(asoc->base.sk);
433 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
435 /* Tell peer that we'll do ECN only if peer advertised such cap. */
436 if (asoc->peer.ecn_capable)
437 chunksize += sizeof(ecap_param);
439 if (asoc->peer.prsctp_capable)
440 chunksize += sizeof(prsctp_param);
442 if (asoc->peer.asconf_capable) {
443 extensions[num_ext] = SCTP_CID_ASCONF;
444 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
448 if (asoc->peer.reconf_capable) {
449 extensions[num_ext] = SCTP_CID_RECONF;
453 if (sp->adaptation_ind)
454 chunksize += sizeof(aiparam);
456 if (asoc->intl_enable) {
457 extensions[num_ext] = SCTP_CID_I_DATA;
461 if (asoc->peer.auth_capable) {
462 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
463 chunksize += ntohs(auth_random->length);
465 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
466 if (auth_hmacs->length)
467 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
471 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
472 if (auth_chunks->length)
473 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
477 extensions[num_ext] = SCTP_CID_AUTH;
482 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
484 /* Now allocate and fill out the chunk. */
485 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
489 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
491 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
492 * HEARTBEAT ACK, * etc.) to the same destination transport
493 * address from which it received the DATA or control chunk
494 * to which it is replying.
496 * [INIT ACK back to where the INIT came from.]
498 if (chunk->transport)
500 sctp_assoc_lookup_paddr(asoc,
501 &chunk->transport->ipaddr);
503 retval->subh.init_hdr =
504 sctp_addto_chunk(retval, sizeof(initack), &initack);
505 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
506 sctp_addto_chunk(retval, cookie_len, cookie);
507 if (asoc->peer.ecn_capable)
508 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
510 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
511 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
512 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
513 sctp_addto_param(retval, num_ext, extensions);
515 if (asoc->peer.prsctp_capable)
516 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
518 if (sp->adaptation_ind) {
519 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
520 aiparam.param_hdr.length = htons(sizeof(aiparam));
521 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
522 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
525 if (asoc->peer.auth_capable) {
526 sctp_addto_chunk(retval, ntohs(auth_random->length),
529 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
532 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
536 /* We need to remove the const qualifier at this point. */
537 retval->asoc = (struct sctp_association *) asoc;
546 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
548 * This chunk is used only during the initialization of an association.
549 * It is sent by the initiator of an association to its peer to complete
550 * the initialization process. This chunk MUST precede any DATA chunk
551 * sent within the association, but MAY be bundled with one or more DATA
552 * chunks in the same packet.
555 * 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
556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557 * | Type = 10 |Chunk Flags | Length |
558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
565 * Set to zero on transmit and ignored on receipt.
567 * Length: 16 bits (unsigned integer)
569 * Set to the size of the chunk in bytes, including the 4 bytes of
570 * the chunk header and the size of the Cookie.
572 * Cookie: variable size
574 * This field must contain the exact cookie received in the
575 * State Cookie parameter from the previous INIT ACK.
577 * An implementation SHOULD make the cookie as small as possible
578 * to insure interoperability.
580 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
581 const struct sctp_chunk *chunk)
583 struct sctp_chunk *retval;
587 cookie = asoc->peer.cookie;
588 cookie_len = asoc->peer.cookie_len;
590 /* Build a cookie echo chunk. */
591 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
592 cookie_len, GFP_ATOMIC);
595 retval->subh.cookie_hdr =
596 sctp_addto_chunk(retval, cookie_len, cookie);
598 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
600 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
601 * HEARTBEAT ACK, * etc.) to the same destination transport
602 * address from which it * received the DATA or control chunk
603 * to which it is replying.
605 * [COOKIE ECHO back to where the INIT ACK came from.]
608 retval->transport = chunk->transport;
614 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
616 * This chunk is used only during the initialization of an
617 * association. It is used to acknowledge the receipt of a COOKIE
618 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
619 * within the association, but MAY be bundled with one or more DATA
620 * chunks or SACK chunk in the same SCTP packet.
623 * 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
624 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
625 * | Type = 11 |Chunk Flags | Length = 4 |
626 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
628 * Chunk Flags: 8 bits
630 * Set to zero on transmit and ignored on receipt.
632 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
633 const struct sctp_chunk *chunk)
635 struct sctp_chunk *retval;
637 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
639 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
641 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
642 * HEARTBEAT ACK, * etc.) to the same destination transport
643 * address from which it * received the DATA or control chunk
644 * to which it is replying.
646 * [COOKIE ACK back to where the COOKIE ECHO came from.]
648 if (retval && chunk && chunk->transport)
650 sctp_assoc_lookup_paddr(asoc,
651 &chunk->transport->ipaddr);
657 * Appendix A: Explicit Congestion Notification:
660 * RFC 2481 details a specific bit for a sender to send in the header of
661 * its next outbound TCP segment to indicate to its peer that it has
662 * reduced its congestion window. This is termed the CWR bit. For
663 * SCTP the same indication is made by including the CWR chunk.
664 * This chunk contains one data element, i.e. the TSN number that
665 * was sent in the ECNE chunk. This element represents the lowest
666 * TSN number in the datagram that was originally marked with the
670 * 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
671 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
672 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
674 * | Lowest TSN Number |
675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
677 * Note: The CWR is considered a Control chunk.
679 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
680 const __u32 lowest_tsn,
681 const struct sctp_chunk *chunk)
683 struct sctp_chunk *retval;
684 struct sctp_cwrhdr cwr;
686 cwr.lowest_tsn = htonl(lowest_tsn);
687 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
688 sizeof(cwr), GFP_ATOMIC);
693 retval->subh.ecn_cwr_hdr =
694 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
696 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
698 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
699 * HEARTBEAT ACK, * etc.) to the same destination transport
700 * address from which it * received the DATA or control chunk
701 * to which it is replying.
703 * [Report a reduced congestion window back to where the ECNE
707 retval->transport = chunk->transport;
713 /* Make an ECNE chunk. This is a congestion experienced report. */
714 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
715 const __u32 lowest_tsn)
717 struct sctp_chunk *retval;
718 struct sctp_ecnehdr ecne;
720 ecne.lowest_tsn = htonl(lowest_tsn);
721 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
722 sizeof(ecne), GFP_ATOMIC);
725 retval->subh.ecne_hdr =
726 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
732 /* Make a DATA chunk for the given association from the provided
733 * parameters. However, do not populate the data payload.
735 struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
736 const struct sctp_sndrcvinfo *sinfo,
737 int len, __u8 flags, gfp_t gfp)
739 struct sctp_chunk *retval;
740 struct sctp_datahdr dp;
742 /* We assign the TSN as LATE as possible, not here when
743 * creating the chunk.
745 memset(&dp, 0, sizeof(dp));
746 dp.ppid = sinfo->sinfo_ppid;
747 dp.stream = htons(sinfo->sinfo_stream);
749 /* Set the flags for an unordered send. */
750 if (sinfo->sinfo_flags & SCTP_UNORDERED)
751 flags |= SCTP_DATA_UNORDERED;
753 retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp);
757 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
758 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
763 /* Create a selective ackowledgement (SACK) for the given
764 * association. This reports on which TSN's we've seen to date,
765 * including duplicates and gaps.
767 struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc)
769 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
770 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
771 __u16 num_gabs, num_dup_tsns;
772 struct sctp_transport *trans;
773 struct sctp_chunk *retval;
774 struct sctp_sackhdr sack;
778 memset(gabs, 0, sizeof(gabs));
779 ctsn = sctp_tsnmap_get_ctsn(map);
781 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
783 /* How much room is needed in the chunk? */
784 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
785 num_dup_tsns = sctp_tsnmap_num_dups(map);
787 /* Initialize the SACK header. */
788 sack.cum_tsn_ack = htonl(ctsn);
789 sack.a_rwnd = htonl(asoc->a_rwnd);
790 sack.num_gap_ack_blocks = htons(num_gabs);
791 sack.num_dup_tsns = htons(num_dup_tsns);
794 + sizeof(struct sctp_gap_ack_block) * num_gabs
795 + sizeof(__u32) * num_dup_tsns;
797 /* Create the chunk. */
798 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
802 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
804 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
805 * HEARTBEAT ACK, etc.) to the same destination transport
806 * address from which it received the DATA or control chunk to
807 * which it is replying. This rule should also be followed if
808 * the endpoint is bundling DATA chunks together with the
811 * However, when acknowledging multiple DATA chunks received
812 * in packets from different source addresses in a single
813 * SACK, the SACK chunk may be transmitted to one of the
814 * destination transport addresses from which the DATA or
815 * control chunks being acknowledged were received.
817 * [BUG: We do not implement the following paragraph.
818 * Perhaps we should remember the last transport we used for a
819 * SACK and avoid that (if possible) if we have seen any
820 * duplicates. --piggy]
822 * When a receiver of a duplicate DATA chunk sends a SACK to a
823 * multi- homed endpoint it MAY be beneficial to vary the
824 * destination address and not use the source address of the
825 * DATA chunk. The reason being that receiving a duplicate
826 * from a multi-homed endpoint might indicate that the return
827 * path (as specified in the source address of the DATA chunk)
828 * for the SACK is broken.
830 * [Send to the address from which we last received a DATA chunk.]
832 retval->transport = asoc->peer.last_data_from;
834 retval->subh.sack_hdr =
835 sctp_addto_chunk(retval, sizeof(sack), &sack);
837 /* Add the gap ack block information. */
839 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
842 /* Add the duplicate TSN information. */
844 asoc->stats.idupchunks += num_dup_tsns;
845 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
846 sctp_tsnmap_get_dups(map));
848 /* Once we have a sack generated, check to see what our sack
849 * generation is, if its 0, reset the transports to 0, and reset
850 * the association generation to 1
852 * The idea is that zero is never used as a valid generation for the
853 * association so no transport will match after a wrap event like this,
854 * Until the next sack
856 if (++asoc->peer.sack_generation == 0) {
857 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
859 trans->sack_generation = 0;
860 asoc->peer.sack_generation = 1;
866 /* Make a SHUTDOWN chunk. */
867 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
868 const struct sctp_chunk *chunk)
870 struct sctp_shutdownhdr shut;
871 struct sctp_chunk *retval;
874 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
875 shut.cum_tsn_ack = htonl(ctsn);
877 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
878 sizeof(shut), GFP_ATOMIC);
882 retval->subh.shutdown_hdr =
883 sctp_addto_chunk(retval, sizeof(shut), &shut);
886 retval->transport = chunk->transport;
891 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
892 const struct sctp_chunk *chunk)
894 struct sctp_chunk *retval;
896 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
899 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
901 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
902 * HEARTBEAT ACK, * etc.) to the same destination transport
903 * address from which it * received the DATA or control chunk
904 * to which it is replying.
906 * [ACK back to where the SHUTDOWN came from.]
909 retval->transport = chunk->transport;
914 struct sctp_chunk *sctp_make_shutdown_complete(
915 const struct sctp_association *asoc,
916 const struct sctp_chunk *chunk)
918 struct sctp_chunk *retval;
921 /* Set the T-bit if we have no association (vtag will be
924 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
926 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
929 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
931 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
932 * HEARTBEAT ACK, * etc.) to the same destination transport
933 * address from which it * received the DATA or control chunk
934 * to which it is replying.
936 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
940 retval->transport = chunk->transport;
945 /* Create an ABORT. Note that we set the T bit if we have no
946 * association, except when responding to an INIT (sctpimpguide 2.41).
948 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
949 const struct sctp_chunk *chunk,
952 struct sctp_chunk *retval;
955 /* Set the T-bit if we have no association and 'chunk' is not
956 * an INIT (vtag will be reflected).
959 if (chunk && chunk->chunk_hdr &&
960 chunk->chunk_hdr->type == SCTP_CID_INIT)
963 flags = SCTP_CHUNK_FLAG_T;
966 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
969 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
971 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
972 * HEARTBEAT ACK, * etc.) to the same destination transport
973 * address from which it * received the DATA or control chunk
974 * to which it is replying.
976 * [ABORT back to where the offender came from.]
979 retval->transport = chunk->transport;
984 /* Helper to create ABORT with a NO_USER_DATA error. */
985 struct sctp_chunk *sctp_make_abort_no_data(
986 const struct sctp_association *asoc,
987 const struct sctp_chunk *chunk,
990 struct sctp_chunk *retval;
993 retval = sctp_make_abort(asoc, chunk,
994 sizeof(struct sctp_errhdr) + sizeof(tsn));
999 /* Put the tsn back into network byte order. */
1000 payload = htonl(tsn);
1001 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
1002 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
1004 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1006 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1007 * HEARTBEAT ACK, * etc.) to the same destination transport
1008 * address from which it * received the DATA or control chunk
1009 * to which it is replying.
1011 * [ABORT back to where the offender came from.]
1014 retval->transport = chunk->transport;
1020 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1021 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1025 struct sctp_chunk *retval;
1026 void *payload = NULL;
1029 retval = sctp_make_abort(asoc, NULL,
1030 sizeof(struct sctp_errhdr) + paylen);
1035 /* Put the msg_iov together into payload. */
1036 payload = kmalloc(paylen, GFP_KERNEL);
1040 err = memcpy_from_msg(payload, msg, paylen);
1045 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1046 sctp_addto_chunk(retval, paylen, payload);
1056 sctp_chunk_free(retval);
1062 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1065 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1068 int chunklen = ntohs(chunk->chunk_hdr->length);
1071 target = skb_put(chunk->skb, len);
1074 memcpy(target, data, len);
1076 memset(target, 0, len);
1078 /* Adjust the chunk length field. */
1079 chunk->chunk_hdr->length = htons(chunklen + len);
1080 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1085 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1086 struct sctp_chunk *sctp_make_abort_violation(
1087 const struct sctp_association *asoc,
1088 const struct sctp_chunk *chunk,
1089 const __u8 *payload,
1090 const size_t paylen)
1092 struct sctp_chunk *retval;
1093 struct sctp_paramhdr phdr;
1095 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1096 paylen + sizeof(phdr));
1100 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1103 phdr.type = htons(chunk->chunk_hdr->type);
1104 phdr.length = chunk->chunk_hdr->length;
1105 sctp_addto_chunk(retval, paylen, payload);
1106 sctp_addto_param(retval, sizeof(phdr), &phdr);
1112 struct sctp_chunk *sctp_make_violation_paramlen(
1113 const struct sctp_association *asoc,
1114 const struct sctp_chunk *chunk,
1115 struct sctp_paramhdr *param)
1117 static const char error[] = "The following parameter had invalid length:";
1118 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1120 struct sctp_chunk *retval;
1122 retval = sctp_make_abort(asoc, chunk, payload_len);
1126 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1127 sizeof(error) + sizeof(*param));
1128 sctp_addto_chunk(retval, sizeof(error), error);
1129 sctp_addto_param(retval, sizeof(*param), param);
1135 struct sctp_chunk *sctp_make_violation_max_retrans(
1136 const struct sctp_association *asoc,
1137 const struct sctp_chunk *chunk)
1139 static const char error[] = "Association exceeded its max_retrans count";
1140 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1141 struct sctp_chunk *retval;
1143 retval = sctp_make_abort(asoc, chunk, payload_len);
1147 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1148 sctp_addto_chunk(retval, sizeof(error), error);
1154 /* Make a HEARTBEAT chunk. */
1155 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1156 const struct sctp_transport *transport)
1158 struct sctp_sender_hb_info hbinfo;
1159 struct sctp_chunk *retval;
1161 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1162 sizeof(hbinfo), GFP_ATOMIC);
1167 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1168 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1169 hbinfo.daddr = transport->ipaddr;
1170 hbinfo.sent_at = jiffies;
1171 hbinfo.hb_nonce = transport->hb_nonce;
1173 /* Cast away the 'const', as this is just telling the chunk
1174 * what transport it belongs to.
1176 retval->transport = (struct sctp_transport *) transport;
1177 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1184 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1185 const struct sctp_chunk *chunk,
1186 const void *payload,
1187 const size_t paylen)
1189 struct sctp_chunk *retval;
1191 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1196 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1198 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1200 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1201 * HEARTBEAT ACK, * etc.) to the same destination transport
1202 * address from which it * received the DATA or control chunk
1203 * to which it is replying.
1205 * [HBACK back to where the HEARTBEAT came from.]
1208 retval->transport = chunk->transport;
1214 /* Create an Operation Error chunk with the specified space reserved.
1215 * This routine can be used for containing multiple causes in the chunk.
1217 static struct sctp_chunk *sctp_make_op_error_space(
1218 const struct sctp_association *asoc,
1219 const struct sctp_chunk *chunk,
1222 struct sctp_chunk *retval;
1224 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1225 sizeof(struct sctp_errhdr) + size,
1230 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1232 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1233 * HEARTBEAT ACK, etc.) to the same destination transport
1234 * address from which it received the DATA or control chunk
1235 * to which it is replying.
1239 retval->transport = chunk->transport;
1245 /* Create an Operation Error chunk of a fixed size, specifically,
1246 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1247 * This is a helper function to allocate an error chunk for for those
1248 * invalid parameter codes in which we may not want to report all the
1249 * errors, if the incoming chunk is large. If it can't fit in a single
1250 * packet, we ignore it.
1252 static inline struct sctp_chunk *sctp_make_op_error_limited(
1253 const struct sctp_association *asoc,
1254 const struct sctp_chunk *chunk)
1256 size_t size = SCTP_DEFAULT_MAXSEGMENT;
1257 struct sctp_sock *sp = NULL;
1260 size = min_t(size_t, size, asoc->pathmtu);
1261 sp = sctp_sk(asoc->base.sk);
1264 size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
1266 return sctp_make_op_error_space(asoc, chunk, size);
1269 /* Create an Operation Error chunk. */
1270 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1271 const struct sctp_chunk *chunk,
1272 __be16 cause_code, const void *payload,
1273 size_t paylen, size_t reserve_tail)
1275 struct sctp_chunk *retval;
1277 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1281 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1282 sctp_addto_chunk(retval, paylen, payload);
1284 sctp_addto_param(retval, reserve_tail, NULL);
1290 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
1293 struct sctp_authhdr auth_hdr;
1294 struct sctp_hmac *hmac_desc;
1295 struct sctp_chunk *retval;
1297 /* Get the first hmac that the peer told us to use */
1298 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1299 if (unlikely(!hmac_desc))
1302 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1303 hmac_desc->hmac_len + sizeof(auth_hdr),
1308 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1309 auth_hdr.shkey_id = htons(key_id);
1311 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1314 skb_put_zero(retval->skb, hmac_desc->hmac_len);
1316 /* Adjust the chunk header to include the empty MAC */
1317 retval->chunk_hdr->length =
1318 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1319 retval->chunk_end = skb_tail_pointer(retval->skb);
1325 /********************************************************************
1326 * 2nd Level Abstractions
1327 ********************************************************************/
1329 /* Turn an skb into a chunk.
1330 * FIXME: Eventually move the structure directly inside the skb->cb[].
1332 * sctpimpguide-05.txt Section 2.8.2
1333 * M1) Each time a new DATA chunk is transmitted
1334 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1335 * 'TSN.Missing.Report' count will be used to determine missing chunks
1336 * and when to fast retransmit.
1339 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1340 const struct sctp_association *asoc,
1341 struct sock *sk, gfp_t gfp)
1343 struct sctp_chunk *retval;
1345 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1350 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1352 INIT_LIST_HEAD(&retval->list);
1354 retval->asoc = (struct sctp_association *)asoc;
1355 retval->singleton = 1;
1357 retval->fast_retransmit = SCTP_CAN_FRTX;
1359 /* Polish the bead hole. */
1360 INIT_LIST_HEAD(&retval->transmitted_list);
1361 INIT_LIST_HEAD(&retval->frag_list);
1362 SCTP_DBG_OBJCNT_INC(chunk);
1363 refcount_set(&retval->refcnt, 1);
1369 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1370 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1371 union sctp_addr *dest)
1373 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1374 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1377 /* Extract the source address from a chunk. */
1378 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1380 /* If we have a known transport, use that. */
1381 if (chunk->transport) {
1382 return &chunk->transport->ipaddr;
1384 /* Otherwise, extract it from the IP header. */
1385 return &chunk->source;
1389 /* Create a new chunk, setting the type and flags headers from the
1390 * arguments, reserving enough space for a 'paylen' byte payload.
1392 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1393 __u8 type, __u8 flags, int paylen,
1396 struct sctp_chunkhdr *chunk_hdr;
1397 struct sctp_chunk *retval;
1398 struct sk_buff *skb;
1402 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1403 if (chunklen > SCTP_MAX_CHUNK_LEN)
1406 /* No need to allocate LL here, as this is only a chunk. */
1407 skb = alloc_skb(chunklen, gfp);
1411 /* Make room for the chunk header. */
1412 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1413 chunk_hdr->type = type;
1414 chunk_hdr->flags = flags;
1415 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1417 sk = asoc ? asoc->base.sk : NULL;
1418 retval = sctp_chunkify(skb, asoc, sk, gfp);
1424 retval->chunk_hdr = chunk_hdr;
1425 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1427 /* Determine if the chunk needs to be authenticated */
1428 if (sctp_auth_send_cid(type, asoc))
1436 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1437 __u8 flags, int paylen, gfp_t gfp)
1439 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1442 struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
1443 __u8 flags, int paylen, gfp_t gfp)
1445 return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);
1448 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1449 __u8 type, __u8 flags, int paylen,
1452 struct sctp_chunk *chunk;
1454 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1456 sctp_control_set_owner_w(chunk);
1461 /* Release the memory occupied by a chunk. */
1462 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1464 BUG_ON(!list_empty(&chunk->list));
1465 list_del_init(&chunk->transmitted_list);
1467 consume_skb(chunk->skb);
1468 consume_skb(chunk->auth_chunk);
1470 SCTP_DBG_OBJCNT_DEC(chunk);
1471 kmem_cache_free(sctp_chunk_cachep, chunk);
1474 /* Possibly, free the chunk. */
1475 void sctp_chunk_free(struct sctp_chunk *chunk)
1477 /* Release our reference on the message tracker. */
1479 sctp_datamsg_put(chunk->msg);
1481 sctp_chunk_put(chunk);
1484 /* Grab a reference to the chunk. */
1485 void sctp_chunk_hold(struct sctp_chunk *ch)
1487 refcount_inc(&ch->refcnt);
1490 /* Release a reference to the chunk. */
1491 void sctp_chunk_put(struct sctp_chunk *ch)
1493 if (refcount_dec_and_test(&ch->refcnt))
1494 sctp_chunk_destroy(ch);
1497 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1500 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1502 int chunklen = ntohs(chunk->chunk_hdr->length);
1503 int padlen = SCTP_PAD4(chunklen) - chunklen;
1506 skb_put_zero(chunk->skb, padlen);
1507 target = skb_put_data(chunk->skb, data, len);
1509 /* Adjust the chunk length field. */
1510 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1511 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1516 /* Append bytes from user space to the end of a chunk. Will panic if
1517 * chunk is not big enough.
1518 * Returns a kernel err value.
1520 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1521 struct iov_iter *from)
1525 /* Make room in chunk for data. */
1526 target = skb_put(chunk->skb, len);
1528 /* Copy data (whole iovec) into chunk */
1529 if (!copy_from_iter_full(target, len, from))
1532 /* Adjust the chunk length field. */
1533 chunk->chunk_hdr->length =
1534 htons(ntohs(chunk->chunk_hdr->length) + len);
1535 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1540 /* Helper function to assign a TSN if needed. This assumes that both
1541 * the data_hdr and association have already been assigned.
1543 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1545 struct sctp_stream *stream;
1546 struct sctp_chunk *lchunk;
1547 struct sctp_datamsg *msg;
1553 /* All fragments will be on the same stream */
1554 sid = ntohs(chunk->subh.data_hdr->stream);
1555 stream = &chunk->asoc->stream;
1557 /* Now assign the sequence number to the entire message.
1558 * All fragments must have the same stream sequence number.
1561 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1562 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1565 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1566 ssn = sctp_ssn_next(stream, out, sid);
1568 ssn = sctp_ssn_peek(stream, out, sid);
1571 lchunk->subh.data_hdr->ssn = htons(ssn);
1572 lchunk->has_ssn = 1;
1576 /* Helper function to assign a TSN if needed. This assumes that both
1577 * the data_hdr and association have already been assigned.
1579 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1581 if (!chunk->has_tsn) {
1582 /* This is the last possible instant to
1585 chunk->subh.data_hdr->tsn =
1586 htonl(sctp_association_get_next_tsn(chunk->asoc));
1591 /* Create a CLOSED association to use with an incoming packet. */
1592 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1593 struct sctp_chunk *chunk,
1596 struct sctp_association *asoc;
1597 enum sctp_scope scope;
1598 struct sk_buff *skb;
1600 /* Create the bare association. */
1601 scope = sctp_scope(sctp_source(chunk));
1602 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1607 /* Create an entry for the source address of the packet. */
1608 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1614 /* Build a cookie representing asoc.
1615 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1617 static struct sctp_cookie_param *sctp_pack_cookie(
1618 const struct sctp_endpoint *ep,
1619 const struct sctp_association *asoc,
1620 const struct sctp_chunk *init_chunk,
1621 int *cookie_len, const __u8 *raw_addrs,
1624 struct sctp_signed_cookie *cookie;
1625 struct sctp_cookie_param *retval;
1626 int headersize, bodysize;
1628 /* Header size is static data prior to the actual cookie, including
1631 headersize = sizeof(struct sctp_paramhdr) +
1632 (sizeof(struct sctp_signed_cookie) -
1633 sizeof(struct sctp_cookie));
1634 bodysize = sizeof(struct sctp_cookie)
1635 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1637 /* Pad out the cookie to a multiple to make the signature
1638 * functions simpler to write.
1640 if (bodysize % SCTP_COOKIE_MULTIPLE)
1641 bodysize += SCTP_COOKIE_MULTIPLE
1642 - (bodysize % SCTP_COOKIE_MULTIPLE);
1643 *cookie_len = headersize + bodysize;
1645 /* Clear this memory since we are sending this data structure
1646 * out on the network.
1648 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1652 cookie = (struct sctp_signed_cookie *) retval->body;
1654 /* Set up the parameter header. */
1655 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1656 retval->p.length = htons(*cookie_len);
1658 /* Copy the cookie part of the association itself. */
1659 cookie->c = asoc->c;
1660 /* Save the raw address list length in the cookie. */
1661 cookie->c.raw_addr_list_len = addrs_len;
1663 /* Remember PR-SCTP capability. */
1664 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1666 /* Save adaptation indication in the cookie. */
1667 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1669 /* Set an expiration time for the cookie. */
1670 cookie->c.expiration = ktime_add(asoc->cookie_life,
1673 /* Copy the peer's init packet. */
1674 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1675 ntohs(init_chunk->chunk_hdr->length));
1677 /* Copy the raw local address list of the association. */
1678 memcpy((__u8 *)&cookie->c.peer_init[0] +
1679 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1681 if (sctp_sk(ep->base.sk)->hmac) {
1682 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1685 /* Sign the message. */
1686 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1688 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1689 sizeof(ep->secret_key)) ?:
1690 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1692 shash_desc_zero(desc);
1706 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1707 struct sctp_association *sctp_unpack_cookie(
1708 const struct sctp_endpoint *ep,
1709 const struct sctp_association *asoc,
1710 struct sctp_chunk *chunk, gfp_t gfp,
1711 int *error, struct sctp_chunk **errp)
1713 struct sctp_association *retval = NULL;
1714 int headersize, bodysize, fixed_size;
1715 struct sctp_signed_cookie *cookie;
1716 struct sk_buff *skb = chunk->skb;
1717 struct sctp_cookie *bear_cookie;
1718 __u8 *digest = ep->digest;
1719 enum sctp_scope scope;
1723 /* Header size is static data prior to the actual cookie, including
1726 headersize = sizeof(struct sctp_chunkhdr) +
1727 (sizeof(struct sctp_signed_cookie) -
1728 sizeof(struct sctp_cookie));
1729 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1730 fixed_size = headersize + sizeof(struct sctp_cookie);
1732 /* Verify that the chunk looks like it even has a cookie.
1733 * There must be enough room for our cookie and our peer's
1736 len = ntohs(chunk->chunk_hdr->length);
1737 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1740 /* Verify that the cookie has been padded out. */
1741 if (bodysize % SCTP_COOKIE_MULTIPLE)
1744 /* Process the cookie. */
1745 cookie = chunk->subh.cookie_hdr;
1746 bear_cookie = &cookie->c;
1748 if (!sctp_sk(ep->base.sk)->hmac)
1751 /* Check the signature. */
1753 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1756 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1758 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1759 sizeof(ep->secret_key)) ?:
1760 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1762 shash_desc_zero(desc);
1765 *error = -SCTP_IERROR_NOMEM;
1770 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1771 *error = -SCTP_IERROR_BAD_SIG;
1776 /* IG Section 2.35.2:
1777 * 3) Compare the port numbers and the verification tag contained
1778 * within the COOKIE ECHO chunk to the actual port numbers and the
1779 * verification tag within the SCTP common header of the received
1780 * packet. If these values do not match the packet MUST be silently
1783 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1784 *error = -SCTP_IERROR_BAD_TAG;
1788 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1789 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1790 *error = -SCTP_IERROR_BAD_PORTS;
1794 /* Check to see if the cookie is stale. If there is already
1795 * an association, there is no need to check cookie's expiration
1796 * for init collision case of lost COOKIE ACK.
1797 * If skb has been timestamped, then use the stamp, otherwise
1798 * use current time. This introduces a small possibility that
1799 * that a cookie may be considered expired, but his would only slow
1800 * down the new association establishment instead of every packet.
1802 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1803 kt = skb_get_ktime(skb);
1805 kt = ktime_get_real();
1807 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1808 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1809 __be32 n = htonl(usecs);
1812 * Section 3.3.10.3 Stale Cookie Error (3)
1816 * Stale Cookie Error: Indicates the receipt of a valid State
1817 * Cookie that has expired.
1819 *errp = sctp_make_op_error(asoc, chunk,
1820 SCTP_ERROR_STALE_COOKIE, &n,
1823 *error = -SCTP_IERROR_STALE_COOKIE;
1825 *error = -SCTP_IERROR_NOMEM;
1830 /* Make a new base association. */
1831 scope = sctp_scope(sctp_source(chunk));
1832 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1834 *error = -SCTP_IERROR_NOMEM;
1838 /* Set up our peer's port number. */
1839 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1841 /* Populate the association from the cookie. */
1842 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1844 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1846 *error = -SCTP_IERROR_NOMEM;
1850 /* Also, add the destination address. */
1851 if (list_empty(&retval->base.bind_addr.address_list)) {
1852 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1853 sizeof(chunk->dest), SCTP_ADDR_SRC,
1857 retval->next_tsn = retval->c.initial_tsn;
1858 retval->ctsn_ack_point = retval->next_tsn - 1;
1859 retval->addip_serial = retval->c.initial_tsn;
1860 retval->strreset_outseq = retval->c.initial_tsn;
1861 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1862 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1863 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1865 /* The INIT stuff will be done by the side effects. */
1870 sctp_association_free(retval);
1875 /* Yikes! The packet is either corrupt or deliberately
1878 *error = -SCTP_IERROR_MALFORMED;
1882 /********************************************************************
1883 * 3rd Level Abstractions
1884 ********************************************************************/
1886 struct __sctp_missing {
1892 * Report a missing mandatory parameter.
1894 static int sctp_process_missing_param(const struct sctp_association *asoc,
1895 enum sctp_param paramtype,
1896 struct sctp_chunk *chunk,
1897 struct sctp_chunk **errp)
1899 struct __sctp_missing report;
1902 len = SCTP_PAD4(sizeof(report));
1904 /* Make an ERROR chunk, preparing enough room for
1905 * returning multiple unknown parameters.
1908 *errp = sctp_make_op_error_space(asoc, chunk, len);
1911 report.num_missing = htonl(1);
1912 report.type = paramtype;
1913 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1915 sctp_addto_chunk(*errp, sizeof(report), &report);
1918 /* Stop processing this chunk. */
1922 /* Report an Invalid Mandatory Parameter. */
1923 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1924 struct sctp_chunk *chunk,
1925 struct sctp_chunk **errp)
1927 /* Invalid Mandatory Parameter Error has no payload. */
1930 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1933 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1935 /* Stop processing this chunk. */
1939 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1940 struct sctp_paramhdr *param,
1941 const struct sctp_chunk *chunk,
1942 struct sctp_chunk **errp)
1944 /* This is a fatal error. Any accumulated non-fatal errors are
1948 sctp_chunk_free(*errp);
1950 /* Create an error chunk and fill it in with our payload. */
1951 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1957 /* Do not attempt to handle the HOST_NAME parm. However, do
1958 * send back an indicator to the peer.
1960 static int sctp_process_hn_param(const struct sctp_association *asoc,
1961 union sctp_params param,
1962 struct sctp_chunk *chunk,
1963 struct sctp_chunk **errp)
1965 __u16 len = ntohs(param.p->length);
1967 /* Processing of the HOST_NAME parameter will generate an
1968 * ABORT. If we've accumulated any non-fatal errors, they
1969 * would be unrecognized parameters and we should not include
1970 * them in the ABORT.
1973 sctp_chunk_free(*errp);
1975 *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
1978 /* Stop processing this chunk. */
1982 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1984 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1985 int have_asconf = 0;
1989 for (i = 0; i < num_ext; i++) {
1990 switch (param.ext->chunks[i]) {
1994 case SCTP_CID_ASCONF:
1995 case SCTP_CID_ASCONF_ACK:
2001 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2002 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2003 * only if ADD-IP is turned on and we are not backward-compatible
2006 if (net->sctp.addip_noauth)
2009 if (net->sctp.addip_enable && !have_auth && have_asconf)
2015 static void sctp_process_ext_param(struct sctp_association *asoc,
2016 union sctp_params param)
2018 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2019 struct net *net = sock_net(asoc->base.sk);
2022 for (i = 0; i < num_ext; i++) {
2023 switch (param.ext->chunks[i]) {
2024 case SCTP_CID_RECONF:
2025 if (asoc->reconf_enable &&
2026 !asoc->peer.reconf_capable)
2027 asoc->peer.reconf_capable = 1;
2029 case SCTP_CID_FWD_TSN:
2030 if (asoc->prsctp_enable && !asoc->peer.prsctp_capable)
2031 asoc->peer.prsctp_capable = 1;
2034 /* if the peer reports AUTH, assume that he
2037 if (asoc->ep->auth_enable)
2038 asoc->peer.auth_capable = 1;
2040 case SCTP_CID_ASCONF:
2041 case SCTP_CID_ASCONF_ACK:
2042 if (net->sctp.addip_enable)
2043 asoc->peer.asconf_capable = 1;
2045 case SCTP_CID_I_DATA:
2046 if (sctp_sk(asoc->base.sk)->strm_interleave)
2047 asoc->intl_enable = 1;
2055 /* RFC 3.2.1 & the Implementers Guide 2.2.
2057 * The Parameter Types are encoded such that the
2058 * highest-order two bits specify the action that must be
2059 * taken if the processing endpoint does not recognize the
2062 * 00 - Stop processing this parameter; do not process any further
2063 * parameters within this chunk
2065 * 01 - Stop processing this parameter, do not process any further
2066 * parameters within this chunk, and report the unrecognized
2067 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2069 * 10 - Skip this parameter and continue processing.
2071 * 11 - Skip this parameter and continue processing but
2072 * report the unrecognized parameter in an
2073 * 'Unrecognized Parameter' ERROR chunk.
2076 * SCTP_IERROR_NO_ERROR - continue with the chunk
2077 * SCTP_IERROR_ERROR - stop and report an error.
2078 * SCTP_IERROR_NOMEME - out of memory.
2080 static enum sctp_ierror sctp_process_unk_param(
2081 const struct sctp_association *asoc,
2082 union sctp_params param,
2083 struct sctp_chunk *chunk,
2084 struct sctp_chunk **errp)
2086 int retval = SCTP_IERROR_NO_ERROR;
2088 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2089 case SCTP_PARAM_ACTION_DISCARD:
2090 retval = SCTP_IERROR_ERROR;
2092 case SCTP_PARAM_ACTION_SKIP:
2094 case SCTP_PARAM_ACTION_DISCARD_ERR:
2095 retval = SCTP_IERROR_ERROR;
2097 case SCTP_PARAM_ACTION_SKIP_ERR:
2098 /* Make an ERROR chunk, preparing enough room for
2099 * returning multiple unknown parameters.
2102 *errp = sctp_make_op_error_limited(asoc, chunk);
2104 /* If there is no memory for generating the
2105 * ERROR report as specified, an ABORT will be
2106 * triggered to the peer and the association
2107 * won't be established.
2109 retval = SCTP_IERROR_NOMEM;
2114 if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2115 ntohs(param.p->length)))
2116 sctp_addto_chunk(*errp, ntohs(param.p->length),
2126 /* Verify variable length parameters
2128 * SCTP_IERROR_ABORT - trigger an ABORT
2129 * SCTP_IERROR_NOMEM - out of memory (abort)
2130 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2131 * SCTP_IERROR_NO_ERROR - continue with the chunk
2133 static enum sctp_ierror sctp_verify_param(struct net *net,
2134 const struct sctp_endpoint *ep,
2135 const struct sctp_association *asoc,
2136 union sctp_params param,
2138 struct sctp_chunk *chunk,
2139 struct sctp_chunk **err_chunk)
2141 struct sctp_hmac_algo_param *hmacs;
2142 int retval = SCTP_IERROR_NO_ERROR;
2143 __u16 n_elt, id = 0;
2146 /* FIXME - This routine is not looking at each parameter per the
2147 * chunk type, i.e., unrecognized parameters should be further
2148 * identified based on the chunk id.
2151 switch (param.p->type) {
2152 case SCTP_PARAM_IPV4_ADDRESS:
2153 case SCTP_PARAM_IPV6_ADDRESS:
2154 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2155 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2156 case SCTP_PARAM_STATE_COOKIE:
2157 case SCTP_PARAM_HEARTBEAT_INFO:
2158 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2159 case SCTP_PARAM_ECN_CAPABLE:
2160 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2163 case SCTP_PARAM_SUPPORTED_EXT:
2164 if (!sctp_verify_ext_param(net, param))
2165 return SCTP_IERROR_ABORT;
2168 case SCTP_PARAM_SET_PRIMARY:
2169 if (net->sctp.addip_enable)
2173 case SCTP_PARAM_HOST_NAME_ADDRESS:
2174 /* Tell the peer, we won't support this param. */
2175 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2176 retval = SCTP_IERROR_ABORT;
2179 case SCTP_PARAM_FWD_TSN_SUPPORT:
2180 if (ep->prsctp_enable)
2184 case SCTP_PARAM_RANDOM:
2185 if (!ep->auth_enable)
2188 /* SCTP-AUTH: Secion 6.1
2189 * If the random number is not 32 byte long the association
2190 * MUST be aborted. The ABORT chunk SHOULD contain the error
2191 * cause 'Protocol Violation'.
2193 if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
2194 sizeof(struct sctp_paramhdr)) {
2195 sctp_process_inv_paramlength(asoc, param.p,
2197 retval = SCTP_IERROR_ABORT;
2201 case SCTP_PARAM_CHUNKS:
2202 if (!ep->auth_enable)
2205 /* SCTP-AUTH: Section 3.2
2206 * The CHUNKS parameter MUST be included once in the INIT or
2207 * INIT-ACK chunk if the sender wants to receive authenticated
2208 * chunks. Its maximum length is 260 bytes.
2210 if (260 < ntohs(param.p->length)) {
2211 sctp_process_inv_paramlength(asoc, param.p,
2213 retval = SCTP_IERROR_ABORT;
2217 case SCTP_PARAM_HMAC_ALGO:
2218 if (!ep->auth_enable)
2221 hmacs = (struct sctp_hmac_algo_param *)param.p;
2222 n_elt = (ntohs(param.p->length) -
2223 sizeof(struct sctp_paramhdr)) >> 1;
2225 /* SCTP-AUTH: Section 6.1
2226 * The HMAC algorithm based on SHA-1 MUST be supported and
2227 * included in the HMAC-ALGO parameter.
2229 for (i = 0; i < n_elt; i++) {
2230 id = ntohs(hmacs->hmac_ids[i]);
2232 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2236 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2237 sctp_process_inv_paramlength(asoc, param.p, chunk,
2239 retval = SCTP_IERROR_ABORT;
2244 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2245 __func__, ntohs(param.p->type), cid);
2247 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2253 /* Verify the INIT packet before we process it. */
2254 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2255 const struct sctp_association *asoc, enum sctp_cid cid,
2256 struct sctp_init_chunk *peer_init,
2257 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2259 union sctp_params param;
2260 bool has_cookie = false;
2263 /* Check for missing mandatory parameters. Note: Initial TSN is
2264 * also mandatory, but is not checked here since the valid range
2265 * is 0..2**32-1. RFC4960, section 3.3.3.
2267 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2268 peer_init->init_hdr.num_inbound_streams == 0 ||
2269 peer_init->init_hdr.init_tag == 0 ||
2270 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2271 return sctp_process_inv_mandatory(asoc, chunk, errp);
2273 sctp_walk_params(param, peer_init, init_hdr.params) {
2274 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2278 /* There is a possibility that a parameter length was bad and
2279 * in that case we would have stoped walking the parameters.
2280 * The current param.p would point at the bad one.
2281 * Current consensus on the mailing list is to generate a PROTOCOL
2282 * VIOLATION error. We build the ERROR chunk here and let the normal
2283 * error handling code build and send the packet.
2285 if (param.v != (void *)chunk->chunk_end)
2286 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2288 /* The only missing mandatory param possible today is
2289 * the state cookie for an INIT-ACK chunk.
2291 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2292 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2295 /* Verify all the variable length parameters */
2296 sctp_walk_params(param, peer_init, init_hdr.params) {
2297 result = sctp_verify_param(net, ep, asoc, param, cid,
2300 case SCTP_IERROR_ABORT:
2301 case SCTP_IERROR_NOMEM:
2303 case SCTP_IERROR_ERROR:
2305 case SCTP_IERROR_NO_ERROR:
2310 } /* for (loop through all parameters) */
2315 /* Unpack the parameters in an INIT packet into an association.
2316 * Returns 0 on failure, else success.
2317 * FIXME: This is an association method.
2319 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2320 const union sctp_addr *peer_addr,
2321 struct sctp_init_chunk *peer_init, gfp_t gfp)
2323 struct net *net = sock_net(asoc->base.sk);
2324 struct sctp_transport *transport;
2325 struct list_head *pos, *temp;
2326 union sctp_params param;
2327 union sctp_addr addr;
2332 /* We must include the address that the INIT packet came from.
2333 * This is the only address that matters for an INIT packet.
2334 * When processing a COOKIE ECHO, we retrieve the from address
2335 * of the INIT from the cookie.
2338 /* This implementation defaults to making the first transport
2339 * added as the primary transport. The source address seems to
2340 * be a a better choice than any of the embedded addresses.
2342 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2345 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2348 /* Process the initialization parameters. */
2349 sctp_walk_params(param, peer_init, init_hdr.params) {
2350 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2351 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2352 af = sctp_get_af_specific(param_type2af(param.p->type));
2353 af->from_addr_param(&addr, param.addr,
2354 chunk->sctp_hdr->source, 0);
2355 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2359 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2363 /* source address of chunk may not match any valid address */
2367 /* AUTH: After processing the parameters, make sure that we
2368 * have all the required info to potentially do authentications.
2370 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2371 !asoc->peer.peer_hmacs))
2372 asoc->peer.auth_capable = 0;
2374 /* In a non-backward compatible mode, if the peer claims
2375 * support for ADD-IP but not AUTH, the ADD-IP spec states
2376 * that we MUST ABORT the association. Section 6. The section
2377 * also give us an option to silently ignore the packet, which
2378 * is what we'll do here.
2380 if (!net->sctp.addip_noauth &&
2381 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2382 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2384 SCTP_PARAM_SET_PRIMARY);
2385 asoc->peer.asconf_capable = 0;
2389 /* Walk list of transports, removing transports in the UNKNOWN state. */
2390 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2391 transport = list_entry(pos, struct sctp_transport, transports);
2392 if (transport->state == SCTP_UNKNOWN) {
2393 sctp_assoc_rm_peer(asoc, transport);
2397 /* The fixed INIT headers are always in network byte
2400 asoc->peer.i.init_tag =
2401 ntohl(peer_init->init_hdr.init_tag);
2402 asoc->peer.i.a_rwnd =
2403 ntohl(peer_init->init_hdr.a_rwnd);
2404 asoc->peer.i.num_outbound_streams =
2405 ntohs(peer_init->init_hdr.num_outbound_streams);
2406 asoc->peer.i.num_inbound_streams =
2407 ntohs(peer_init->init_hdr.num_inbound_streams);
2408 asoc->peer.i.initial_tsn =
2409 ntohl(peer_init->init_hdr.initial_tsn);
2411 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2413 /* Apply the upper bounds for output streams based on peer's
2414 * number of inbound streams.
2416 if (asoc->c.sinit_num_ostreams >
2417 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2418 asoc->c.sinit_num_ostreams =
2419 ntohs(peer_init->init_hdr.num_inbound_streams);
2422 if (asoc->c.sinit_max_instreams >
2423 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2424 asoc->c.sinit_max_instreams =
2425 ntohs(peer_init->init_hdr.num_outbound_streams);
2428 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2429 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2431 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2432 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2434 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2435 cookie = asoc->peer.cookie;
2437 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2438 if (!asoc->peer.cookie)
2442 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2443 * high (for example, implementations MAY use the size of the receiver
2444 * advertised window).
2446 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2448 transport->ssthresh = asoc->peer.i.a_rwnd;
2451 /* Set up the TSN tracking pieces. */
2452 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2453 asoc->peer.i.initial_tsn, gfp))
2456 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2458 * The stream sequence number in all the streams shall start
2459 * from 0 when the association is established. Also, when the
2460 * stream sequence number reaches the value 65535 the next
2461 * stream sequence number shall be set to 0.
2464 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2465 asoc->c.sinit_max_instreams, gfp))
2468 /* Update frag_point when stream_interleave may get changed. */
2469 sctp_assoc_update_frag_point(asoc);
2471 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2474 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2476 * When an endpoint has an ASCONF signaled change to be sent to the
2477 * remote endpoint it should do the following:
2479 * A2) A serial number should be assigned to the Chunk. The serial
2480 * number should be a monotonically increasing number. All serial
2481 * numbers are defined to be initialized at the start of the
2482 * association to the same value as the Initial TSN.
2484 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2488 /* Release the transport structures. */
2489 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2490 transport = list_entry(pos, struct sctp_transport, transports);
2491 if (transport->state != SCTP_ACTIVE)
2492 sctp_assoc_rm_peer(asoc, transport);
2500 /* Update asoc with the option described in param.
2502 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2504 * asoc is the association to update.
2505 * param is the variable length parameter to use for update.
2506 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2507 * If the current packet is an INIT we want to minimize the amount of
2508 * work we do. In particular, we should not build transport
2509 * structures for the addresses.
2511 static int sctp_process_param(struct sctp_association *asoc,
2512 union sctp_params param,
2513 const union sctp_addr *peer_addr,
2516 struct net *net = sock_net(asoc->base.sk);
2517 struct sctp_endpoint *ep = asoc->ep;
2518 union sctp_addr_param *addr_param;
2519 struct sctp_transport *t;
2520 enum sctp_scope scope;
2521 union sctp_addr addr;
2527 /* We maintain all INIT parameters in network byte order all the
2528 * time. This allows us to not worry about whether the parameters
2529 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2531 switch (param.p->type) {
2532 case SCTP_PARAM_IPV6_ADDRESS:
2533 if (PF_INET6 != asoc->base.sk->sk_family)
2537 case SCTP_PARAM_IPV4_ADDRESS:
2538 /* v4 addresses are not allowed on v6-only socket */
2539 if (ipv6_only_sock(asoc->base.sk))
2542 af = sctp_get_af_specific(param_type2af(param.p->type));
2543 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2544 scope = sctp_scope(peer_addr);
2545 if (sctp_in_scope(net, &addr, scope))
2546 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2550 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2551 if (!net->sctp.cookie_preserve_enable)
2554 stale = ntohl(param.life->lifespan_increment);
2556 /* Suggested Cookie Life span increment's unit is msec,
2559 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2562 case SCTP_PARAM_HOST_NAME_ADDRESS:
2563 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2566 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2567 /* Turn off the default values first so we'll know which
2568 * ones are really set by the peer.
2570 asoc->peer.ipv4_address = 0;
2571 asoc->peer.ipv6_address = 0;
2573 /* Assume that peer supports the address family
2574 * by which it sends a packet.
2576 if (peer_addr->sa.sa_family == AF_INET6)
2577 asoc->peer.ipv6_address = 1;
2578 else if (peer_addr->sa.sa_family == AF_INET)
2579 asoc->peer.ipv4_address = 1;
2581 /* Cycle through address types; avoid divide by 0. */
2582 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2584 sat /= sizeof(__u16);
2586 for (i = 0; i < sat; ++i) {
2587 switch (param.sat->types[i]) {
2588 case SCTP_PARAM_IPV4_ADDRESS:
2589 asoc->peer.ipv4_address = 1;
2592 case SCTP_PARAM_IPV6_ADDRESS:
2593 if (PF_INET6 == asoc->base.sk->sk_family)
2594 asoc->peer.ipv6_address = 1;
2597 case SCTP_PARAM_HOST_NAME_ADDRESS:
2598 asoc->peer.hostname_address = 1;
2601 default: /* Just ignore anything else. */
2607 case SCTP_PARAM_STATE_COOKIE:
2608 asoc->peer.cookie_len =
2609 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2610 asoc->peer.cookie = param.cookie->body;
2613 case SCTP_PARAM_HEARTBEAT_INFO:
2614 /* Would be odd to receive, but it causes no problems. */
2617 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2618 /* Rejected during verify stage. */
2621 case SCTP_PARAM_ECN_CAPABLE:
2622 asoc->peer.ecn_capable = 1;
2625 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2626 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2629 case SCTP_PARAM_SET_PRIMARY:
2630 if (!net->sctp.addip_enable)
2633 addr_param = param.v + sizeof(struct sctp_addip_param);
2635 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2639 af->from_addr_param(&addr, addr_param,
2640 htons(asoc->peer.port), 0);
2642 /* if the address is invalid, we can't process it.
2643 * XXX: see spec for what to do.
2645 if (!af->addr_valid(&addr, NULL, NULL))
2648 t = sctp_assoc_lookup_paddr(asoc, &addr);
2652 sctp_assoc_set_primary(asoc, t);
2655 case SCTP_PARAM_SUPPORTED_EXT:
2656 sctp_process_ext_param(asoc, param);
2659 case SCTP_PARAM_FWD_TSN_SUPPORT:
2660 if (asoc->prsctp_enable) {
2661 asoc->peer.prsctp_capable = 1;
2667 case SCTP_PARAM_RANDOM:
2668 if (!ep->auth_enable)
2671 /* Save peer's random parameter */
2672 asoc->peer.peer_random = kmemdup(param.p,
2673 ntohs(param.p->length), gfp);
2674 if (!asoc->peer.peer_random) {
2680 case SCTP_PARAM_HMAC_ALGO:
2681 if (!ep->auth_enable)
2684 /* Save peer's HMAC list */
2685 asoc->peer.peer_hmacs = kmemdup(param.p,
2686 ntohs(param.p->length), gfp);
2687 if (!asoc->peer.peer_hmacs) {
2692 /* Set the default HMAC the peer requested*/
2693 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2696 case SCTP_PARAM_CHUNKS:
2697 if (!ep->auth_enable)
2700 asoc->peer.peer_chunks = kmemdup(param.p,
2701 ntohs(param.p->length), gfp);
2702 if (!asoc->peer.peer_chunks)
2707 /* Any unrecognized parameters should have been caught
2708 * and handled by sctp_verify_param() which should be
2709 * called prior to this routine. Simply log the error
2712 pr_debug("%s: ignoring param:%d for association:%p.\n",
2713 __func__, ntohs(param.p->type), asoc);
2720 /* Select a new verification tag. */
2721 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2723 /* I believe that this random number generator complies with RFC1750.
2724 * A tag of 0 is reserved for special cases (e.g. INIT).
2729 get_random_bytes(&x, sizeof(__u32));
2735 /* Select an initial TSN to send during startup. */
2736 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2740 get_random_bytes(&retval, sizeof(__u32));
2745 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2747 * 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
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2750 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * | Address Parameter |
2754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2755 * | ASCONF Parameter #1 |
2756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2760 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2761 * | ASCONF Parameter #N |
2762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2764 * Address Parameter and other parameter will not be wrapped in this function
2766 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2767 union sctp_addr *addr,
2770 struct sctp_addiphdr asconf;
2771 struct sctp_chunk *retval;
2772 int length = sizeof(asconf) + vparam_len;
2773 union sctp_addr_param addrparam;
2775 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2777 addrlen = af->to_addr_param(addr, &addrparam);
2782 /* Create the chunk. */
2783 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2788 asconf.serial = htonl(asoc->addip_serial++);
2790 retval->subh.addip_hdr =
2791 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2792 retval->param_hdr.v =
2793 sctp_addto_chunk(retval, addrlen, &addrparam);
2799 * 3.2.1 Add IP Address
2801 * 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
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * | Type = 0xC001 | Length = Variable |
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 * | ASCONF-Request Correlation ID |
2806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 * | Address Parameter |
2808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2810 * 3.2.2 Delete IP Address
2812 * 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
2813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2814 * | Type = 0xC002 | Length = Variable |
2815 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2816 * | ASCONF-Request Correlation ID |
2817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2818 * | Address Parameter |
2819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2822 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2823 union sctp_addr *laddr,
2824 struct sockaddr *addrs,
2825 int addrcnt, __be16 flags)
2827 union sctp_addr_param addr_param;
2828 struct sctp_addip_param param;
2829 int paramlen = sizeof(param);
2830 struct sctp_chunk *retval;
2831 int addr_param_len = 0;
2832 union sctp_addr *addr;
2833 int totallen = 0, i;
2838 /* Get total length of all the address parameters. */
2840 for (i = 0; i < addrcnt; i++) {
2842 af = sctp_get_af_specific(addr->v4.sin_family);
2843 addr_param_len = af->to_addr_param(addr, &addr_param);
2845 totallen += paramlen;
2846 totallen += addr_param_len;
2848 addr_buf += af->sockaddr_len;
2849 if (asoc->asconf_addr_del_pending && !del_pickup) {
2850 /* reuse the parameter length from the same scope one */
2851 totallen += paramlen;
2852 totallen += addr_param_len;
2855 pr_debug("%s: picked same-scope del_pending addr, "
2856 "totallen for all addresses is %d\n",
2857 __func__, totallen);
2861 /* Create an asconf chunk with the required length. */
2862 retval = sctp_make_asconf(asoc, laddr, totallen);
2866 /* Add the address parameters to the asconf chunk. */
2868 for (i = 0; i < addrcnt; i++) {
2870 af = sctp_get_af_specific(addr->v4.sin_family);
2871 addr_param_len = af->to_addr_param(addr, &addr_param);
2872 param.param_hdr.type = flags;
2873 param.param_hdr.length = htons(paramlen + addr_param_len);
2874 param.crr_id = htonl(i);
2876 sctp_addto_chunk(retval, paramlen, ¶m);
2877 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2879 addr_buf += af->sockaddr_len;
2881 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2882 addr = asoc->asconf_addr_del_pending;
2883 af = sctp_get_af_specific(addr->v4.sin_family);
2884 addr_param_len = af->to_addr_param(addr, &addr_param);
2885 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2886 param.param_hdr.length = htons(paramlen + addr_param_len);
2887 param.crr_id = htonl(i);
2889 sctp_addto_chunk(retval, paramlen, ¶m);
2890 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2896 * 3.2.4 Set Primary IP Address
2898 * 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
2899 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2900 * | Type =0xC004 | Length = Variable |
2901 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2902 * | ASCONF-Request Correlation ID |
2903 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2904 * | Address Parameter |
2905 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2907 * Create an ASCONF chunk with Set Primary IP address parameter.
2909 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2910 union sctp_addr *addr)
2912 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2913 union sctp_addr_param addrparam;
2914 struct sctp_addip_param param;
2915 struct sctp_chunk *retval;
2916 int len = sizeof(param);
2919 addrlen = af->to_addr_param(addr, &addrparam);
2924 /* Create the chunk and make asconf header. */
2925 retval = sctp_make_asconf(asoc, addr, len);
2929 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2930 param.param_hdr.length = htons(len);
2933 sctp_addto_chunk(retval, sizeof(param), ¶m);
2934 sctp_addto_chunk(retval, addrlen, &addrparam);
2939 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2941 * 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
2942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2943 * | Type = 0x80 | Chunk Flags | Chunk Length |
2944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * | ASCONF Parameter Response#1 |
2948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2953 * | ASCONF Parameter Response#N |
2954 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2956 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2958 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2959 __u32 serial, int vparam_len)
2961 struct sctp_addiphdr asconf;
2962 struct sctp_chunk *retval;
2963 int length = sizeof(asconf) + vparam_len;
2965 /* Create the chunk. */
2966 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2971 asconf.serial = htonl(serial);
2973 retval->subh.addip_hdr =
2974 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2979 /* Add response parameters to an ASCONF_ACK chunk. */
2980 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2982 struct sctp_addip_param *asconf_param)
2984 struct sctp_addip_param ack_param;
2985 struct sctp_errhdr err_param;
2986 int asconf_param_len = 0;
2987 int err_param_len = 0;
2988 __be16 response_type;
2990 if (SCTP_ERROR_NO_ERROR == err_code) {
2991 response_type = SCTP_PARAM_SUCCESS_REPORT;
2993 response_type = SCTP_PARAM_ERR_CAUSE;
2994 err_param_len = sizeof(err_param);
2997 ntohs(asconf_param->param_hdr.length);
3000 /* Add Success Indication or Error Cause Indication parameter. */
3001 ack_param.param_hdr.type = response_type;
3002 ack_param.param_hdr.length = htons(sizeof(ack_param) +
3005 ack_param.crr_id = crr_id;
3006 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3008 if (SCTP_ERROR_NO_ERROR == err_code)
3011 /* Add Error Cause parameter. */
3012 err_param.cause = err_code;
3013 err_param.length = htons(err_param_len + asconf_param_len);
3014 sctp_addto_chunk(chunk, err_param_len, &err_param);
3016 /* Add the failed TLV copied from ASCONF chunk. */
3018 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3021 /* Process a asconf parameter. */
3022 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3023 struct sctp_chunk *asconf,
3024 struct sctp_addip_param *asconf_param)
3026 union sctp_addr_param *addr_param;
3027 struct sctp_transport *peer;
3028 union sctp_addr addr;
3031 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3033 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3034 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3035 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3036 return SCTP_ERROR_UNKNOWN_PARAM;
3038 switch (addr_param->p.type) {
3039 case SCTP_PARAM_IPV6_ADDRESS:
3040 if (!asoc->peer.ipv6_address)
3041 return SCTP_ERROR_DNS_FAILED;
3043 case SCTP_PARAM_IPV4_ADDRESS:
3044 if (!asoc->peer.ipv4_address)
3045 return SCTP_ERROR_DNS_FAILED;
3048 return SCTP_ERROR_DNS_FAILED;
3051 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3053 return SCTP_ERROR_DNS_FAILED;
3055 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3057 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3058 * or multicast address.
3059 * (note: wildcard is permitted and requires special handling so
3060 * make sure we check for that)
3062 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3063 return SCTP_ERROR_DNS_FAILED;
3065 switch (asconf_param->param_hdr.type) {
3066 case SCTP_PARAM_ADD_IP:
3068 * If the address 0.0.0.0 or ::0 is provided, the source
3069 * address of the packet MUST be added.
3071 if (af->is_any(&addr))
3072 memcpy(&addr, &asconf->source, sizeof(addr));
3074 if (security_sctp_bind_connect(asoc->ep->base.sk,
3076 (struct sockaddr *)&addr,
3078 return SCTP_ERROR_REQ_REFUSED;
3080 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3081 * request and does not have the local resources to add this
3082 * new address to the association, it MUST return an Error
3083 * Cause TLV set to the new error code 'Operation Refused
3084 * Due to Resource Shortage'.
3087 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3089 return SCTP_ERROR_RSRC_LOW;
3091 /* Start the heartbeat timer. */
3092 sctp_transport_reset_hb_timer(peer);
3093 asoc->new_transport = peer;
3095 case SCTP_PARAM_DEL_IP:
3096 /* ADDIP 4.3 D7) If a request is received to delete the
3097 * last remaining IP address of a peer endpoint, the receiver
3098 * MUST send an Error Cause TLV with the error cause set to the
3099 * new error code 'Request to Delete Last Remaining IP Address'.
3101 if (asoc->peer.transport_count == 1)
3102 return SCTP_ERROR_DEL_LAST_IP;
3104 /* ADDIP 4.3 D8) If a request is received to delete an IP
3105 * address which is also the source address of the IP packet
3106 * which contained the ASCONF chunk, the receiver MUST reject
3107 * this request. To reject the request the receiver MUST send
3108 * an Error Cause TLV set to the new error code 'Request to
3109 * Delete Source IP Address'
3111 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3112 return SCTP_ERROR_DEL_SRC_IP;
3115 * If the address 0.0.0.0 or ::0 is provided, all
3116 * addresses of the peer except the source address of the
3117 * packet MUST be deleted.
3119 if (af->is_any(&addr)) {
3120 sctp_assoc_set_primary(asoc, asconf->transport);
3121 sctp_assoc_del_nonprimary_peers(asoc,
3123 return SCTP_ERROR_NO_ERROR;
3126 /* If the address is not part of the association, the
3127 * ASCONF-ACK with Error Cause Indication Parameter
3128 * which including cause of Unresolvable Address should
3131 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3133 return SCTP_ERROR_DNS_FAILED;
3135 sctp_assoc_rm_peer(asoc, peer);
3137 case SCTP_PARAM_SET_PRIMARY:
3138 /* ADDIP Section 4.2.4
3139 * If the address 0.0.0.0 or ::0 is provided, the receiver
3140 * MAY mark the source address of the packet as its
3143 if (af->is_any(&addr))
3144 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3146 if (security_sctp_bind_connect(asoc->ep->base.sk,
3147 SCTP_PARAM_SET_PRIMARY,
3148 (struct sockaddr *)&addr,
3150 return SCTP_ERROR_REQ_REFUSED;
3152 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3154 return SCTP_ERROR_DNS_FAILED;
3156 sctp_assoc_set_primary(asoc, peer);
3160 return SCTP_ERROR_NO_ERROR;
3163 /* Verify the ASCONF packet before we process it. */
3164 bool sctp_verify_asconf(const struct sctp_association *asoc,
3165 struct sctp_chunk *chunk, bool addr_param_needed,
3166 struct sctp_paramhdr **errp)
3168 struct sctp_addip_chunk *addip;
3169 bool addr_param_seen = false;
3170 union sctp_params param;
3172 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3173 sctp_walk_params(param, addip, addip_hdr.params) {
3174 size_t length = ntohs(param.p->length);
3177 switch (param.p->type) {
3178 case SCTP_PARAM_ERR_CAUSE:
3180 case SCTP_PARAM_IPV4_ADDRESS:
3181 if (length != sizeof(struct sctp_ipv4addr_param))
3183 /* ensure there is only one addr param and it's in the
3184 * beginning of addip_hdr params, or we reject it.
3186 if (param.v != addip->addip_hdr.params)
3188 addr_param_seen = true;
3190 case SCTP_PARAM_IPV6_ADDRESS:
3191 if (length != sizeof(struct sctp_ipv6addr_param))
3193 if (param.v != addip->addip_hdr.params)
3195 addr_param_seen = true;
3197 case SCTP_PARAM_ADD_IP:
3198 case SCTP_PARAM_DEL_IP:
3199 case SCTP_PARAM_SET_PRIMARY:
3200 /* In ASCONF chunks, these need to be first. */
3201 if (addr_param_needed && !addr_param_seen)
3203 length = ntohs(param.addip->param_hdr.length);
3204 if (length < sizeof(struct sctp_addip_param) +
3208 case SCTP_PARAM_SUCCESS_REPORT:
3209 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3210 if (length != sizeof(struct sctp_addip_param))
3214 /* This is unkown to us, reject! */
3219 /* Remaining sanity checks. */
3220 if (addr_param_needed && !addr_param_seen)
3222 if (!addr_param_needed && addr_param_seen)
3224 if (param.v != chunk->chunk_end)
3230 /* Process an incoming ASCONF chunk with the next expected serial no. and
3231 * return an ASCONF_ACK chunk to be sent in response.
3233 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3234 struct sctp_chunk *asconf)
3236 union sctp_addr_param *addr_param;
3237 struct sctp_addip_chunk *addip;
3238 struct sctp_chunk *asconf_ack;
3239 bool all_param_pass = true;
3240 struct sctp_addiphdr *hdr;
3241 int length = 0, chunk_len;
3242 union sctp_params param;
3246 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3247 chunk_len = ntohs(asconf->chunk_hdr->length) -
3248 sizeof(struct sctp_chunkhdr);
3249 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3250 serial = ntohl(hdr->serial);
3252 /* Skip the addiphdr and store a pointer to address parameter. */
3253 length = sizeof(*hdr);
3254 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3255 chunk_len -= length;
3257 /* Skip the address parameter and store a pointer to the first
3260 length = ntohs(addr_param->p.length);
3261 chunk_len -= length;
3263 /* create an ASCONF_ACK chunk.
3264 * Based on the definitions of parameters, we know that the size of
3265 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3268 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3272 /* Process the TLVs contained within the ASCONF chunk. */
3273 sctp_walk_params(param, addip, addip_hdr.params) {
3274 /* Skip preceeding address parameters. */
3275 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3276 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3279 err_code = sctp_process_asconf_param(asoc, asconf,
3282 * If an error response is received for a TLV parameter,
3283 * all TLVs with no response before the failed TLV are
3284 * considered successful if not reported. All TLVs after
3285 * the failed response are considered unsuccessful unless
3286 * a specific success indication is present for the parameter.
3288 if (err_code != SCTP_ERROR_NO_ERROR)
3289 all_param_pass = false;
3290 if (!all_param_pass)
3291 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3292 err_code, param.addip);
3294 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3295 * an IP address sends an 'Out of Resource' in its response, it
3296 * MUST also fail any subsequent add or delete requests bundled
3299 if (err_code == SCTP_ERROR_RSRC_LOW)
3303 asoc->peer.addip_serial++;
3305 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3306 * after freeing the reference to old asconf ack if any.
3309 sctp_chunk_hold(asconf_ack);
3310 list_add_tail(&asconf_ack->transmitted_list,
3311 &asoc->asconf_ack_list);
3317 /* Process a asconf parameter that is successfully acked. */
3318 static void sctp_asconf_param_success(struct sctp_association *asoc,
3319 struct sctp_addip_param *asconf_param)
3321 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3322 union sctp_addr_param *addr_param;
3323 struct sctp_sockaddr_entry *saddr;
3324 struct sctp_transport *transport;
3325 union sctp_addr addr;
3328 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3330 /* We have checked the packet before, so we do not check again. */
3331 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3332 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3334 switch (asconf_param->param_hdr.type) {
3335 case SCTP_PARAM_ADD_IP:
3336 /* This is always done in BH context with a socket lock
3337 * held, so the list can not change.
3340 list_for_each_entry(saddr, &bp->address_list, list) {
3341 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3342 saddr->state = SCTP_ADDR_SRC;
3345 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3347 sctp_transport_dst_release(transport);
3350 case SCTP_PARAM_DEL_IP:
3352 sctp_del_bind_addr(bp, &addr);
3353 if (asoc->asconf_addr_del_pending != NULL &&
3354 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3355 kfree(asoc->asconf_addr_del_pending);
3356 asoc->asconf_addr_del_pending = NULL;
3359 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3361 sctp_transport_dst_release(transport);
3369 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3370 * for the given asconf parameter. If there is no response for this parameter,
3371 * return the error code based on the third argument 'no_err'.
3373 * A7) If an error response is received for a TLV parameter, all TLVs with no
3374 * response before the failed TLV are considered successful if not reported.
3375 * All TLVs after the failed response are considered unsuccessful unless a
3376 * specific success indication is present for the parameter.
3378 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3379 struct sctp_addip_param *asconf_param,
3382 struct sctp_addip_param *asconf_ack_param;
3383 struct sctp_errhdr *err_param;
3389 err_code = SCTP_ERROR_NO_ERROR;
3391 err_code = SCTP_ERROR_REQ_REFUSED;
3393 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3394 sizeof(struct sctp_chunkhdr);
3396 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3397 * the first asconf_ack parameter.
3399 length = sizeof(struct sctp_addiphdr);
3400 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3402 asconf_ack_len -= length;
3404 while (asconf_ack_len > 0) {
3405 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3406 switch (asconf_ack_param->param_hdr.type) {
3407 case SCTP_PARAM_SUCCESS_REPORT:
3408 return SCTP_ERROR_NO_ERROR;
3409 case SCTP_PARAM_ERR_CAUSE:
3410 length = sizeof(*asconf_ack_param);
3411 err_param = (void *)asconf_ack_param + length;
3412 asconf_ack_len -= length;
3413 if (asconf_ack_len > 0)
3414 return err_param->cause;
3416 return SCTP_ERROR_INV_PARAM;
3419 return SCTP_ERROR_INV_PARAM;
3423 length = ntohs(asconf_ack_param->param_hdr.length);
3424 asconf_ack_param = (void *)asconf_ack_param + length;
3425 asconf_ack_len -= length;
3431 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3432 int sctp_process_asconf_ack(struct sctp_association *asoc,
3433 struct sctp_chunk *asconf_ack)
3435 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3436 struct sctp_addip_param *asconf_param;
3437 __be16 err_code = SCTP_ERROR_NO_ERROR;
3438 union sctp_addr_param *addr_param;
3439 int asconf_len = asconf->skb->len;
3440 int all_param_pass = 0;
3445 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3446 * a pointer to address parameter.
3448 length = sizeof(struct sctp_addip_chunk);
3449 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3450 asconf_len -= length;
3452 /* Skip the address parameter in the last asconf sent and store a
3453 * pointer to the first asconf parameter.
3455 length = ntohs(addr_param->p.length);
3456 asconf_param = (void *)addr_param + length;
3457 asconf_len -= length;
3460 * A8) If there is no response(s) to specific TLV parameter(s), and no
3461 * failures are indicated, then all request(s) are considered
3464 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3467 /* Process the TLVs contained in the last sent ASCONF chunk. */
3468 while (asconf_len > 0) {
3470 err_code = SCTP_ERROR_NO_ERROR;
3472 err_code = sctp_get_asconf_response(asconf_ack,
3475 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3480 case SCTP_ERROR_NO_ERROR:
3481 sctp_asconf_param_success(asoc, asconf_param);
3484 case SCTP_ERROR_RSRC_LOW:
3488 case SCTP_ERROR_UNKNOWN_PARAM:
3489 /* Disable sending this type of asconf parameter in
3492 asoc->peer.addip_disabled_mask |=
3493 asconf_param->param_hdr.type;
3496 case SCTP_ERROR_REQ_REFUSED:
3497 case SCTP_ERROR_DEL_LAST_IP:
3498 case SCTP_ERROR_DEL_SRC_IP:
3503 /* Skip the processed asconf parameter and move to the next
3506 length = ntohs(asconf_param->param_hdr.length);
3507 asconf_param = (void *)asconf_param + length;
3508 asconf_len -= length;
3511 if (no_err && asoc->src_out_of_asoc_ok) {
3512 asoc->src_out_of_asoc_ok = 0;
3513 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3516 /* Free the cached last sent asconf chunk. */
3517 list_del_init(&asconf->transmitted_list);
3518 sctp_chunk_free(asconf);
3519 asoc->addip_last_asconf = NULL;
3524 /* Make a FWD TSN chunk. */
3525 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3526 __u32 new_cum_tsn, size_t nstreams,
3527 struct sctp_fwdtsn_skip *skiplist)
3529 struct sctp_chunk *retval = NULL;
3530 struct sctp_fwdtsn_hdr ftsn_hdr;
3531 struct sctp_fwdtsn_skip skip;
3535 hint = (nstreams + 1) * sizeof(__u32);
3537 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3542 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3543 retval->subh.fwdtsn_hdr =
3544 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3546 for (i = 0; i < nstreams; i++) {
3547 skip.stream = skiplist[i].stream;
3548 skip.ssn = skiplist[i].ssn;
3549 sctp_addto_chunk(retval, sizeof(skip), &skip);
3555 struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
3556 __u32 new_cum_tsn, size_t nstreams,
3557 struct sctp_ifwdtsn_skip *skiplist)
3559 struct sctp_chunk *retval = NULL;
3560 struct sctp_ifwdtsn_hdr ftsn_hdr;
3563 hint = (nstreams + 1) * sizeof(__u32);
3565 retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
3570 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3571 retval->subh.ifwdtsn_hdr =
3572 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3574 sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
3579 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3581 * 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
3582 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 * | Type = 130 | Chunk Flags | Chunk Length |
3584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3586 * / Re-configuration Parameter /
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3590 * / Re-configuration Parameter (optional) /
3592 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3594 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3597 struct sctp_reconf_chunk *reconf;
3598 struct sctp_chunk *retval;
3600 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3605 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3606 retval->param_hdr.v = reconf->params;
3611 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3613 * 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
3614 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3615 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3616 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3617 * | Re-configuration Request Sequence Number |
3618 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3619 * | Re-configuration Response Sequence Number |
3620 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3621 * | Sender's Last Assigned TSN |
3622 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3623 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3624 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3626 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3627 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3630 * RE-CONFIG 4.2 (STREAM IN RESET)
3632 * 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
3633 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3634 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3635 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3636 * | Re-configuration Request Sequence Number |
3637 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3638 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3639 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3641 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3642 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3643 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3645 struct sctp_chunk *sctp_make_strreset_req(
3646 const struct sctp_association *asoc,
3647 __u16 stream_num, __be16 *stream_list,
3650 __u16 stream_len = stream_num * sizeof(__u16);
3651 struct sctp_strreset_outreq outreq;
3652 struct sctp_strreset_inreq inreq;
3653 struct sctp_chunk *retval;
3654 __u16 outlen, inlen;
3656 outlen = (sizeof(outreq) + stream_len) * out;
3657 inlen = (sizeof(inreq) + stream_len) * in;
3659 retval = sctp_make_reconf(asoc, outlen + inlen);
3664 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3665 outreq.param_hdr.length = htons(outlen);
3666 outreq.request_seq = htonl(asoc->strreset_outseq);
3667 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3668 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3670 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3673 sctp_addto_chunk(retval, stream_len, stream_list);
3677 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3678 inreq.param_hdr.length = htons(inlen);
3679 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3681 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3684 sctp_addto_chunk(retval, stream_len, stream_list);
3690 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3692 * 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
3693 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3694 * | Parameter Type = 15 | Parameter Length = 8 |
3695 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3696 * | Re-configuration Request Sequence Number |
3697 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3699 struct sctp_chunk *sctp_make_strreset_tsnreq(
3700 const struct sctp_association *asoc)
3702 struct sctp_strreset_tsnreq tsnreq;
3703 __u16 length = sizeof(tsnreq);
3704 struct sctp_chunk *retval;
3706 retval = sctp_make_reconf(asoc, length);
3710 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3711 tsnreq.param_hdr.length = htons(length);
3712 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3714 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3719 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3721 * 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
3722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3723 * | Parameter Type = 17 | Parameter Length = 12 |
3724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3725 * | Re-configuration Request Sequence Number |
3726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3727 * | Number of new streams | Reserved |
3728 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3730 struct sctp_chunk *sctp_make_strreset_addstrm(
3731 const struct sctp_association *asoc,
3732 __u16 out, __u16 in)
3734 struct sctp_strreset_addstrm addstrm;
3735 __u16 size = sizeof(addstrm);
3736 struct sctp_chunk *retval;
3738 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3743 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3744 addstrm.param_hdr.length = htons(size);
3745 addstrm.number_of_streams = htons(out);
3746 addstrm.request_seq = htonl(asoc->strreset_outseq);
3747 addstrm.reserved = 0;
3749 sctp_addto_chunk(retval, size, &addstrm);
3753 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3754 addstrm.param_hdr.length = htons(size);
3755 addstrm.number_of_streams = htons(in);
3756 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3757 addstrm.reserved = 0;
3759 sctp_addto_chunk(retval, size, &addstrm);
3765 /* RE-CONFIG 4.4 (RESP)
3767 * 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
3768 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3769 * | Parameter Type = 16 | Parameter Length |
3770 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3771 * | Re-configuration Response Sequence Number |
3772 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3774 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3776 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3777 __u32 result, __u32 sn)
3779 struct sctp_strreset_resp resp;
3780 __u16 length = sizeof(resp);
3781 struct sctp_chunk *retval;
3783 retval = sctp_make_reconf(asoc, length);
3787 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3788 resp.param_hdr.length = htons(length);
3789 resp.response_seq = htonl(sn);
3790 resp.result = htonl(result);
3792 sctp_addto_chunk(retval, sizeof(resp), &resp);
3797 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3799 * 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
3800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3801 * | Parameter Type = 16 | Parameter Length |
3802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3803 * | Re-configuration Response Sequence Number |
3804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3807 * | Sender's Next TSN (optional) |
3808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3809 * | Receiver's Next TSN (optional) |
3810 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3812 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3813 __u32 result, __u32 sn,
3817 struct sctp_strreset_resptsn tsnresp;
3818 __u16 length = sizeof(tsnresp);
3819 struct sctp_chunk *retval;
3821 retval = sctp_make_reconf(asoc, length);
3825 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3826 tsnresp.param_hdr.length = htons(length);
3828 tsnresp.response_seq = htonl(sn);
3829 tsnresp.result = htonl(result);
3830 tsnresp.senders_next_tsn = htonl(sender_tsn);
3831 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3833 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3838 bool sctp_verify_reconf(const struct sctp_association *asoc,
3839 struct sctp_chunk *chunk,
3840 struct sctp_paramhdr **errp)
3842 struct sctp_reconf_chunk *hdr;
3843 union sctp_params param;
3847 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3848 sctp_walk_params(param, hdr, params) {
3849 __u16 length = ntohs(param.p->length);
3854 switch (param.p->type) {
3855 case SCTP_PARAM_RESET_OUT_REQUEST:
3856 if (length < sizeof(struct sctp_strreset_outreq) ||
3857 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3858 last != SCTP_PARAM_RESET_IN_REQUEST))
3861 case SCTP_PARAM_RESET_IN_REQUEST:
3862 if (length < sizeof(struct sctp_strreset_inreq) ||
3863 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3866 case SCTP_PARAM_RESET_RESPONSE:
3867 if ((length != sizeof(struct sctp_strreset_resp) &&
3868 length != sizeof(struct sctp_strreset_resptsn)) ||
3869 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3870 last != SCTP_PARAM_RESET_OUT_REQUEST))
3873 case SCTP_PARAM_RESET_TSN_REQUEST:
3875 sizeof(struct sctp_strreset_tsnreq) || last)
3878 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3879 if (length != sizeof(struct sctp_strreset_addstrm) ||
3880 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3883 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3884 if (length != sizeof(struct sctp_strreset_addstrm) ||
3885 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3892 last = param.p->type;