1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2002 Intel Corp.
8 * This file is part of the SCTP kernel implementation
10 * These functions work with the state functions in sctp_sm_statefuns.c
11 * to implement the state operations. These functions implement the
12 * steps which require modifying existing data structures.
14 * Please send any bug reports or fixes you make to the
16 * lksctp developers <linux-sctp@vger.kernel.org>
18 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * C. Robin <chris@hundredacre.ac.uk>
22 * Jon Grimm <jgrimm@us.ibm.com>
23 * Xingang Guo <xingang.guo@intel.com>
24 * Dajiang Zhang <dajiang.zhang@nokia.com>
25 * Sridhar Samudrala <sri@us.ibm.com>
26 * Daisy Chang <daisyc@us.ibm.com>
27 * Ardelle Fan <ardelle.fan@intel.com>
28 * Kevin Gao <kevin.gao@intel.com>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <crypto/hash.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
37 #include <linux/ipv6.h>
38 #include <linux/net.h>
39 #include <linux/inet.h>
40 #include <linux/scatterlist.h>
41 #include <linux/slab.h>
44 #include <linux/skbuff.h>
45 #include <linux/random.h> /* for get_random_bytes */
46 #include <net/sctp/sctp.h>
47 #include <net/sctp/sm.h>
49 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
50 __u8 type, __u8 flags, int paylen,
52 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
53 __u8 flags, int paylen, gfp_t gfp);
54 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
55 __u8 type, __u8 flags, int paylen,
57 static struct sctp_cookie_param *sctp_pack_cookie(
58 const struct sctp_endpoint *ep,
59 const struct sctp_association *asoc,
60 const struct sctp_chunk *init_chunk,
62 const __u8 *raw_addrs, int addrs_len);
63 static int sctp_process_param(struct sctp_association *asoc,
64 union sctp_params param,
65 const union sctp_addr *peer_addr,
67 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
70 /* Control chunk destructor */
71 static void sctp_control_release_owner(struct sk_buff *skb)
73 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
76 struct sctp_shared_key *shkey = chunk->shkey;
77 struct sctp_association *asoc = chunk->asoc;
79 /* refcnt == 2 and !list_empty mean after this release, it's
80 * not being used anywhere, and it's time to notify userland
81 * that this shkey can be freed if it's been deactivated.
83 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
84 refcount_read(&shkey->refcnt) == 2) {
85 struct sctp_ulpevent *ev;
87 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
91 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
93 sctp_auth_shkey_release(chunk->shkey);
97 static void sctp_control_set_owner_w(struct sctp_chunk *chunk)
99 struct sctp_association *asoc = chunk->asoc;
100 struct sk_buff *skb = chunk->skb;
102 /* TODO: properly account for control chunks.
103 * To do it right we'll need:
104 * 1) endpoint if association isn't known.
105 * 2) proper memory accounting.
107 * For now don't do anything for now.
110 chunk->shkey = asoc->shkey;
111 sctp_auth_shkey_hold(chunk->shkey);
113 skb->sk = asoc ? asoc->base.sk : NULL;
114 skb_shinfo(skb)->destructor_arg = chunk;
115 skb->destructor = sctp_control_release_owner;
118 /* What was the inbound interface for this chunk? */
119 int sctp_chunk_iif(const struct sctp_chunk *chunk)
121 struct sk_buff *skb = chunk->skb;
123 return SCTP_INPUT_CB(skb)->af->skb_iif(skb);
126 /* RFC 2960 3.3.2 Initiation (INIT) (1)
128 * Note 2: The ECN capable field is reserved for future use of
129 * Explicit Congestion Notification.
131 static const struct sctp_paramhdr ecap_param = {
132 SCTP_PARAM_ECN_CAPABLE,
133 cpu_to_be16(sizeof(struct sctp_paramhdr)),
135 static const struct sctp_paramhdr prsctp_param = {
136 SCTP_PARAM_FWD_TSN_SUPPORT,
137 cpu_to_be16(sizeof(struct sctp_paramhdr)),
140 /* A helper to initialize an op error inside a provided chunk, as most
141 * cause codes will be embedded inside an abort chunk.
143 int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
146 struct sctp_errhdr err;
149 /* Cause code constants are now defined in network order. */
150 err.cause = cause_code;
151 len = sizeof(err) + paylen;
152 err.length = htons(len);
154 if (skb_tailroom(chunk->skb) < len)
157 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
162 /* 3.3.2 Initiation (INIT) (1)
164 * This chunk is used to initiate a SCTP association between two
165 * endpoints. The format of the INIT chunk is shown below:
168 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * | Type = 1 | Chunk Flags | Chunk Length |
171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 * | Advertised Receiver Window Credit (a_rwnd) |
175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
176 * | Number of Outbound Streams | Number of Inbound Streams |
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * / Optional/Variable-Length Parameters /
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * The INIT chunk contains the following parameters. Unless otherwise
187 * noted, each parameter MUST only be included once in the INIT chunk.
189 * Fixed Parameters Status
190 * ----------------------------------------------
191 * Initiate Tag Mandatory
192 * Advertised Receiver Window Credit Mandatory
193 * Number of Outbound Streams Mandatory
194 * Number of Inbound Streams Mandatory
195 * Initial TSN Mandatory
197 * Variable Parameters Status Type Value
198 * -------------------------------------------------------------
199 * IPv4 Address (Note 1) Optional 5
200 * IPv6 Address (Note 1) Optional 6
201 * Cookie Preservative Optional 9
202 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
203 * Host Name Address (Note 3) Optional 11
204 * Supported Address Types (Note 4) Optional 12
206 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
207 const struct sctp_bind_addr *bp,
208 gfp_t gfp, int vparam_len)
210 struct sctp_supported_ext_param ext_param;
211 struct sctp_adaptation_ind_param aiparam;
212 struct sctp_paramhdr *auth_chunks = NULL;
213 struct sctp_paramhdr *auth_hmacs = NULL;
214 struct sctp_supported_addrs_param sat;
215 struct sctp_endpoint *ep = asoc->ep;
216 struct sctp_chunk *retval = NULL;
217 int num_types, addrs_len = 0;
218 struct sctp_inithdr init;
219 union sctp_params addrs;
220 struct sctp_sock *sp;
226 /* RFC 2960 3.3.2 Initiation (INIT) (1)
228 * Note 1: The INIT chunks can contain multiple addresses that
229 * can be IPv4 and/or IPv6 in any combination.
232 /* Convert the provided bind address list to raw format. */
233 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
235 init.init_tag = htonl(asoc->c.my_vtag);
236 init.a_rwnd = htonl(asoc->rwnd);
237 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
238 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
239 init.initial_tsn = htonl(asoc->c.initial_tsn);
241 /* How many address types are needed? */
242 sp = sctp_sk(asoc->base.sk);
243 num_types = sp->pf->supported_addrs(sp, types);
245 chunksize = sizeof(init) + addrs_len;
246 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
248 if (asoc->ep->ecn_enable)
249 chunksize += sizeof(ecap_param);
251 if (asoc->ep->prsctp_enable)
252 chunksize += sizeof(prsctp_param);
254 /* ADDIP: Section 4.2.7:
255 * An implementation supporting this extension [ADDIP] MUST list
256 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
257 * INIT-ACK parameters.
259 if (asoc->ep->asconf_enable) {
260 extensions[num_ext] = SCTP_CID_ASCONF;
261 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
265 if (asoc->ep->reconf_enable) {
266 extensions[num_ext] = SCTP_CID_RECONF;
270 if (sp->adaptation_ind)
271 chunksize += sizeof(aiparam);
273 if (asoc->ep->intl_enable) {
274 extensions[num_ext] = SCTP_CID_I_DATA;
278 chunksize += vparam_len;
280 /* Account for AUTH related parameters */
281 if (ep->auth_enable) {
282 /* Add random parameter length*/
283 chunksize += sizeof(asoc->c.auth_random);
285 /* Add HMACS parameter length if any were defined */
286 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
287 if (auth_hmacs->length)
288 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
292 /* Add CHUNKS parameter length */
293 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
294 if (auth_chunks->length)
295 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
299 extensions[num_ext] = SCTP_CID_AUTH;
303 /* If we have any extensions to report, account for that */
305 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
307 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 * Note 3: An INIT chunk MUST NOT contain more than one Host
310 * Name address parameter. Moreover, the sender of the INIT
311 * MUST NOT combine any other address types with the Host Name
312 * address in the INIT. The receiver of INIT MUST ignore any
313 * other address types if the Host Name address parameter is
314 * present in the received INIT chunk.
316 * PLEASE DO NOT FIXME [This version does not support Host Name.]
319 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
323 retval->subh.init_hdr =
324 sctp_addto_chunk(retval, sizeof(init), &init);
325 retval->param_hdr.v =
326 sctp_addto_chunk(retval, addrs_len, addrs.v);
328 /* RFC 2960 3.3.2 Initiation (INIT) (1)
330 * Note 4: This parameter, when present, specifies all the
331 * address types the sending endpoint can support. The absence
332 * of this parameter indicates that the sending endpoint can
333 * support any address type.
335 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
336 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
337 sctp_addto_chunk(retval, sizeof(sat), &sat);
338 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
340 if (asoc->ep->ecn_enable)
341 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
343 /* Add the supported extensions parameter. Be nice and add this
344 * fist before addiding the parameters for the extensions themselves
347 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
348 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
349 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
350 sctp_addto_param(retval, num_ext, extensions);
353 if (asoc->ep->prsctp_enable)
354 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
356 if (sp->adaptation_ind) {
357 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
358 aiparam.param_hdr.length = htons(sizeof(aiparam));
359 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
360 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
363 /* Add SCTP-AUTH chunks to the parameter list */
364 if (ep->auth_enable) {
365 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
366 asoc->c.auth_random);
368 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
371 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
379 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
380 const struct sctp_chunk *chunk,
381 gfp_t gfp, int unkparam_len)
383 struct sctp_supported_ext_param ext_param;
384 struct sctp_adaptation_ind_param aiparam;
385 struct sctp_paramhdr *auth_chunks = NULL;
386 struct sctp_paramhdr *auth_random = NULL;
387 struct sctp_paramhdr *auth_hmacs = NULL;
388 struct sctp_chunk *retval = NULL;
389 struct sctp_cookie_param *cookie;
390 struct sctp_inithdr initack;
391 union sctp_params addrs;
392 struct sctp_sock *sp;
399 /* Note: there may be no addresses to embed. */
400 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
402 initack.init_tag = htonl(asoc->c.my_vtag);
403 initack.a_rwnd = htonl(asoc->rwnd);
404 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
405 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
406 initack.initial_tsn = htonl(asoc->c.initial_tsn);
408 /* FIXME: We really ought to build the cookie right
409 * into the packet instead of allocating more fresh memory.
411 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
416 /* Calculate the total size of allocation, include the reserved
417 * space for reporting unknown parameters if it is specified.
419 sp = sctp_sk(asoc->base.sk);
420 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
422 /* Tell peer that we'll do ECN only if peer advertised such cap. */
423 if (asoc->peer.ecn_capable)
424 chunksize += sizeof(ecap_param);
426 if (asoc->peer.prsctp_capable)
427 chunksize += sizeof(prsctp_param);
429 if (asoc->peer.asconf_capable) {
430 extensions[num_ext] = SCTP_CID_ASCONF;
431 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
435 if (asoc->peer.reconf_capable) {
436 extensions[num_ext] = SCTP_CID_RECONF;
440 if (sp->adaptation_ind)
441 chunksize += sizeof(aiparam);
443 if (asoc->peer.intl_capable) {
444 extensions[num_ext] = SCTP_CID_I_DATA;
448 if (asoc->peer.auth_capable) {
449 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
450 chunksize += ntohs(auth_random->length);
452 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
453 if (auth_hmacs->length)
454 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
458 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
459 if (auth_chunks->length)
460 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
464 extensions[num_ext] = SCTP_CID_AUTH;
469 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
471 /* Now allocate and fill out the chunk. */
472 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
476 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
478 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
479 * HEARTBEAT ACK, * etc.) to the same destination transport
480 * address from which it received the DATA or control chunk
481 * to which it is replying.
483 * [INIT ACK back to where the INIT came from.]
485 if (chunk->transport)
487 sctp_assoc_lookup_paddr(asoc,
488 &chunk->transport->ipaddr);
490 retval->subh.init_hdr =
491 sctp_addto_chunk(retval, sizeof(initack), &initack);
492 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
493 sctp_addto_chunk(retval, cookie_len, cookie);
494 if (asoc->peer.ecn_capable)
495 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
497 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
498 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
499 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
500 sctp_addto_param(retval, num_ext, extensions);
502 if (asoc->peer.prsctp_capable)
503 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
505 if (sp->adaptation_ind) {
506 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
507 aiparam.param_hdr.length = htons(sizeof(aiparam));
508 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
509 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
512 if (asoc->peer.auth_capable) {
513 sctp_addto_chunk(retval, ntohs(auth_random->length),
516 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
519 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
523 /* We need to remove the const qualifier at this point. */
524 retval->asoc = (struct sctp_association *) asoc;
533 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
535 * This chunk is used only during the initialization of an association.
536 * It is sent by the initiator of an association to its peer to complete
537 * the initialization process. This chunk MUST precede any DATA chunk
538 * sent within the association, but MAY be bundled with one or more DATA
539 * chunks in the same packet.
542 * 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
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Type = 10 |Chunk Flags | Length |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * Set to zero on transmit and ignored on receipt.
554 * Length: 16 bits (unsigned integer)
556 * Set to the size of the chunk in bytes, including the 4 bytes of
557 * the chunk header and the size of the Cookie.
559 * Cookie: variable size
561 * This field must contain the exact cookie received in the
562 * State Cookie parameter from the previous INIT ACK.
564 * An implementation SHOULD make the cookie as small as possible
565 * to insure interoperability.
567 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
568 const struct sctp_chunk *chunk)
570 struct sctp_chunk *retval;
574 cookie = asoc->peer.cookie;
575 cookie_len = asoc->peer.cookie_len;
577 /* Build a cookie echo chunk. */
578 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
579 cookie_len, GFP_ATOMIC);
582 retval->subh.cookie_hdr =
583 sctp_addto_chunk(retval, cookie_len, cookie);
585 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
587 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
588 * HEARTBEAT ACK, * etc.) to the same destination transport
589 * address from which it * received the DATA or control chunk
590 * to which it is replying.
592 * [COOKIE ECHO back to where the INIT ACK came from.]
595 retval->transport = chunk->transport;
601 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
603 * This chunk is used only during the initialization of an
604 * association. It is used to acknowledge the receipt of a COOKIE
605 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
606 * within the association, but MAY be bundled with one or more DATA
607 * chunks or SACK chunk in the same SCTP packet.
610 * 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
611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * | Type = 11 |Chunk Flags | Length = 4 |
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
615 * Chunk Flags: 8 bits
617 * Set to zero on transmit and ignored on receipt.
619 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
620 const struct sctp_chunk *chunk)
622 struct sctp_chunk *retval;
624 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
626 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
628 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
629 * HEARTBEAT ACK, * etc.) to the same destination transport
630 * address from which it * received the DATA or control chunk
631 * to which it is replying.
633 * [COOKIE ACK back to where the COOKIE ECHO came from.]
635 if (retval && chunk && chunk->transport)
637 sctp_assoc_lookup_paddr(asoc,
638 &chunk->transport->ipaddr);
644 * Appendix A: Explicit Congestion Notification:
647 * RFC 2481 details a specific bit for a sender to send in the header of
648 * its next outbound TCP segment to indicate to its peer that it has
649 * reduced its congestion window. This is termed the CWR bit. For
650 * SCTP the same indication is made by including the CWR chunk.
651 * This chunk contains one data element, i.e. the TSN number that
652 * was sent in the ECNE chunk. This element represents the lowest
653 * TSN number in the datagram that was originally marked with the
657 * 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
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661 * | Lowest TSN Number |
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664 * Note: The CWR is considered a Control chunk.
666 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
667 const __u32 lowest_tsn,
668 const struct sctp_chunk *chunk)
670 struct sctp_chunk *retval;
671 struct sctp_cwrhdr cwr;
673 cwr.lowest_tsn = htonl(lowest_tsn);
674 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
675 sizeof(cwr), GFP_ATOMIC);
680 retval->subh.ecn_cwr_hdr =
681 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
683 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
685 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
686 * HEARTBEAT ACK, * etc.) to the same destination transport
687 * address from which it * received the DATA or control chunk
688 * to which it is replying.
690 * [Report a reduced congestion window back to where the ECNE
694 retval->transport = chunk->transport;
700 /* Make an ECNE chunk. This is a congestion experienced report. */
701 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
702 const __u32 lowest_tsn)
704 struct sctp_chunk *retval;
705 struct sctp_ecnehdr ecne;
707 ecne.lowest_tsn = htonl(lowest_tsn);
708 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
709 sizeof(ecne), GFP_ATOMIC);
712 retval->subh.ecne_hdr =
713 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
719 /* Make a DATA chunk for the given association from the provided
720 * parameters. However, do not populate the data payload.
722 struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
723 const struct sctp_sndrcvinfo *sinfo,
724 int len, __u8 flags, gfp_t gfp)
726 struct sctp_chunk *retval;
727 struct sctp_datahdr dp;
729 /* We assign the TSN as LATE as possible, not here when
730 * creating the chunk.
732 memset(&dp, 0, sizeof(dp));
733 dp.ppid = sinfo->sinfo_ppid;
734 dp.stream = htons(sinfo->sinfo_stream);
736 /* Set the flags for an unordered send. */
737 if (sinfo->sinfo_flags & SCTP_UNORDERED)
738 flags |= SCTP_DATA_UNORDERED;
740 retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp);
744 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
745 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
750 /* Create a selective ackowledgement (SACK) for the given
751 * association. This reports on which TSN's we've seen to date,
752 * including duplicates and gaps.
754 struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc)
756 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
757 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
758 __u16 num_gabs, num_dup_tsns;
759 struct sctp_transport *trans;
760 struct sctp_chunk *retval;
761 struct sctp_sackhdr sack;
765 memset(gabs, 0, sizeof(gabs));
766 ctsn = sctp_tsnmap_get_ctsn(map);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
770 /* How much room is needed in the chunk? */
771 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
772 num_dup_tsns = sctp_tsnmap_num_dups(map);
774 /* Initialize the SACK header. */
775 sack.cum_tsn_ack = htonl(ctsn);
776 sack.a_rwnd = htonl(asoc->a_rwnd);
777 sack.num_gap_ack_blocks = htons(num_gabs);
778 sack.num_dup_tsns = htons(num_dup_tsns);
781 + sizeof(struct sctp_gap_ack_block) * num_gabs
782 + sizeof(__u32) * num_dup_tsns;
784 /* Create the chunk. */
785 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval->transport = asoc->peer.last_data_from;
821 retval->subh.sack_hdr =
822 sctp_addto_chunk(retval, sizeof(sack), &sack);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
829 /* Add the duplicate TSN information. */
831 asoc->stats.idupchunks += num_dup_tsns;
832 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
833 sctp_tsnmap_get_dups(map));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++asoc->peer.sack_generation == 0) {
844 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
846 trans->sack_generation = 0;
847 asoc->peer.sack_generation = 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
855 const struct sctp_chunk *chunk)
857 struct sctp_shutdownhdr shut;
858 struct sctp_chunk *retval;
861 if (chunk && chunk->asoc)
862 ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map);
864 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
866 shut.cum_tsn_ack = htonl(ctsn);
868 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
869 sizeof(shut), GFP_ATOMIC);
873 retval->subh.shutdown_hdr =
874 sctp_addto_chunk(retval, sizeof(shut), &shut);
877 retval->transport = chunk->transport;
882 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
883 const struct sctp_chunk *chunk)
885 struct sctp_chunk *retval;
887 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
890 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
892 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
893 * HEARTBEAT ACK, * etc.) to the same destination transport
894 * address from which it * received the DATA or control chunk
895 * to which it is replying.
897 * [ACK back to where the SHUTDOWN came from.]
900 retval->transport = chunk->transport;
905 struct sctp_chunk *sctp_make_shutdown_complete(
906 const struct sctp_association *asoc,
907 const struct sctp_chunk *chunk)
909 struct sctp_chunk *retval;
912 /* Set the T-bit if we have no association (vtag will be
915 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
917 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
920 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
922 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
923 * HEARTBEAT ACK, * etc.) to the same destination transport
924 * address from which it * received the DATA or control chunk
925 * to which it is replying.
927 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
931 retval->transport = chunk->transport;
936 /* Create an ABORT. Note that we set the T bit if we have no
937 * association, except when responding to an INIT (sctpimpguide 2.41).
939 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
940 const struct sctp_chunk *chunk,
943 struct sctp_chunk *retval;
946 /* Set the T-bit if we have no association and 'chunk' is not
947 * an INIT (vtag will be reflected).
950 if (chunk && chunk->chunk_hdr &&
951 chunk->chunk_hdr->type == SCTP_CID_INIT)
954 flags = SCTP_CHUNK_FLAG_T;
957 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
960 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
962 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
963 * HEARTBEAT ACK, * etc.) to the same destination transport
964 * address from which it * received the DATA or control chunk
965 * to which it is replying.
967 * [ABORT back to where the offender came from.]
970 retval->transport = chunk->transport;
975 /* Helper to create ABORT with a NO_USER_DATA error. */
976 struct sctp_chunk *sctp_make_abort_no_data(
977 const struct sctp_association *asoc,
978 const struct sctp_chunk *chunk,
981 struct sctp_chunk *retval;
984 retval = sctp_make_abort(asoc, chunk,
985 sizeof(struct sctp_errhdr) + sizeof(tsn));
990 /* Put the tsn back into network byte order. */
991 payload = htonl(tsn);
992 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
993 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
995 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
997 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
998 * HEARTBEAT ACK, * etc.) to the same destination transport
999 * address from which it * received the DATA or control chunk
1000 * to which it is replying.
1002 * [ABORT back to where the offender came from.]
1005 retval->transport = chunk->transport;
1011 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1012 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1016 struct sctp_chunk *retval;
1017 void *payload = NULL;
1020 retval = sctp_make_abort(asoc, NULL,
1021 sizeof(struct sctp_errhdr) + paylen);
1026 /* Put the msg_iov together into payload. */
1027 payload = kmalloc(paylen, GFP_KERNEL);
1031 err = memcpy_from_msg(payload, msg, paylen);
1036 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1037 sctp_addto_chunk(retval, paylen, payload);
1047 sctp_chunk_free(retval);
1053 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1056 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1059 int chunklen = ntohs(chunk->chunk_hdr->length);
1062 target = skb_put(chunk->skb, len);
1065 memcpy(target, data, len);
1067 memset(target, 0, len);
1069 /* Adjust the chunk length field. */
1070 chunk->chunk_hdr->length = htons(chunklen + len);
1071 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1076 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1077 struct sctp_chunk *sctp_make_abort_violation(
1078 const struct sctp_association *asoc,
1079 const struct sctp_chunk *chunk,
1080 const __u8 *payload,
1081 const size_t paylen)
1083 struct sctp_chunk *retval;
1084 struct sctp_paramhdr phdr;
1086 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1087 paylen + sizeof(phdr));
1091 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1094 phdr.type = htons(chunk->chunk_hdr->type);
1095 phdr.length = chunk->chunk_hdr->length;
1096 sctp_addto_chunk(retval, paylen, payload);
1097 sctp_addto_param(retval, sizeof(phdr), &phdr);
1103 struct sctp_chunk *sctp_make_violation_paramlen(
1104 const struct sctp_association *asoc,
1105 const struct sctp_chunk *chunk,
1106 struct sctp_paramhdr *param)
1108 static const char error[] = "The following parameter had invalid length:";
1109 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1111 struct sctp_chunk *retval;
1113 retval = sctp_make_abort(asoc, chunk, payload_len);
1117 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1118 sizeof(error) + sizeof(*param));
1119 sctp_addto_chunk(retval, sizeof(error), error);
1120 sctp_addto_param(retval, sizeof(*param), param);
1126 struct sctp_chunk *sctp_make_violation_max_retrans(
1127 const struct sctp_association *asoc,
1128 const struct sctp_chunk *chunk)
1130 static const char error[] = "Association exceeded its max_retrans count";
1131 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1132 struct sctp_chunk *retval;
1134 retval = sctp_make_abort(asoc, chunk, payload_len);
1138 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1139 sctp_addto_chunk(retval, sizeof(error), error);
1145 /* Make a HEARTBEAT chunk. */
1146 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1147 const struct sctp_transport *transport)
1149 struct sctp_sender_hb_info hbinfo;
1150 struct sctp_chunk *retval;
1152 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1153 sizeof(hbinfo), GFP_ATOMIC);
1158 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1159 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1160 hbinfo.daddr = transport->ipaddr;
1161 hbinfo.sent_at = jiffies;
1162 hbinfo.hb_nonce = transport->hb_nonce;
1164 /* Cast away the 'const', as this is just telling the chunk
1165 * what transport it belongs to.
1167 retval->transport = (struct sctp_transport *) transport;
1168 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1175 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1176 const struct sctp_chunk *chunk,
1177 const void *payload,
1178 const size_t paylen)
1180 struct sctp_chunk *retval;
1182 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1187 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1189 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1191 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1192 * HEARTBEAT ACK, * etc.) to the same destination transport
1193 * address from which it * received the DATA or control chunk
1194 * to which it is replying.
1196 * [HBACK back to where the HEARTBEAT came from.]
1199 retval->transport = chunk->transport;
1205 /* Create an Operation Error chunk with the specified space reserved.
1206 * This routine can be used for containing multiple causes in the chunk.
1208 static struct sctp_chunk *sctp_make_op_error_space(
1209 const struct sctp_association *asoc,
1210 const struct sctp_chunk *chunk,
1213 struct sctp_chunk *retval;
1215 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1216 sizeof(struct sctp_errhdr) + size,
1221 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1223 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1224 * HEARTBEAT ACK, etc.) to the same destination transport
1225 * address from which it received the DATA or control chunk
1226 * to which it is replying.
1230 retval->transport = chunk->transport;
1236 /* Create an Operation Error chunk of a fixed size, specifically,
1237 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1238 * This is a helper function to allocate an error chunk for those
1239 * invalid parameter codes in which we may not want to report all the
1240 * errors, if the incoming chunk is large. If it can't fit in a single
1241 * packet, we ignore it.
1243 static inline struct sctp_chunk *sctp_make_op_error_limited(
1244 const struct sctp_association *asoc,
1245 const struct sctp_chunk *chunk)
1247 size_t size = SCTP_DEFAULT_MAXSEGMENT;
1248 struct sctp_sock *sp = NULL;
1251 size = min_t(size_t, size, asoc->pathmtu);
1252 sp = sctp_sk(asoc->base.sk);
1255 size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
1257 return sctp_make_op_error_space(asoc, chunk, size);
1260 /* Create an Operation Error chunk. */
1261 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1262 const struct sctp_chunk *chunk,
1263 __be16 cause_code, const void *payload,
1264 size_t paylen, size_t reserve_tail)
1266 struct sctp_chunk *retval;
1268 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1272 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1273 sctp_addto_chunk(retval, paylen, payload);
1275 sctp_addto_param(retval, reserve_tail, NULL);
1281 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
1284 struct sctp_authhdr auth_hdr;
1285 struct sctp_hmac *hmac_desc;
1286 struct sctp_chunk *retval;
1288 /* Get the first hmac that the peer told us to use */
1289 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1290 if (unlikely(!hmac_desc))
1293 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1294 hmac_desc->hmac_len + sizeof(auth_hdr),
1299 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1300 auth_hdr.shkey_id = htons(key_id);
1302 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1305 skb_put_zero(retval->skb, hmac_desc->hmac_len);
1307 /* Adjust the chunk header to include the empty MAC */
1308 retval->chunk_hdr->length =
1309 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1310 retval->chunk_end = skb_tail_pointer(retval->skb);
1316 /********************************************************************
1317 * 2nd Level Abstractions
1318 ********************************************************************/
1320 /* Turn an skb into a chunk.
1321 * FIXME: Eventually move the structure directly inside the skb->cb[].
1323 * sctpimpguide-05.txt Section 2.8.2
1324 * M1) Each time a new DATA chunk is transmitted
1325 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1326 * 'TSN.Missing.Report' count will be used to determine missing chunks
1327 * and when to fast retransmit.
1330 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1331 const struct sctp_association *asoc,
1332 struct sock *sk, gfp_t gfp)
1334 struct sctp_chunk *retval;
1336 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1341 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1343 INIT_LIST_HEAD(&retval->list);
1345 retval->asoc = (struct sctp_association *)asoc;
1346 retval->singleton = 1;
1348 retval->fast_retransmit = SCTP_CAN_FRTX;
1350 /* Polish the bead hole. */
1351 INIT_LIST_HEAD(&retval->transmitted_list);
1352 INIT_LIST_HEAD(&retval->frag_list);
1353 SCTP_DBG_OBJCNT_INC(chunk);
1354 refcount_set(&retval->refcnt, 1);
1360 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1361 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1362 union sctp_addr *dest)
1364 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1365 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1368 /* Extract the source address from a chunk. */
1369 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1371 /* If we have a known transport, use that. */
1372 if (chunk->transport) {
1373 return &chunk->transport->ipaddr;
1375 /* Otherwise, extract it from the IP header. */
1376 return &chunk->source;
1380 /* Create a new chunk, setting the type and flags headers from the
1381 * arguments, reserving enough space for a 'paylen' byte payload.
1383 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1384 __u8 type, __u8 flags, int paylen,
1387 struct sctp_chunkhdr *chunk_hdr;
1388 struct sctp_chunk *retval;
1389 struct sk_buff *skb;
1393 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1394 if (chunklen > SCTP_MAX_CHUNK_LEN)
1397 /* No need to allocate LL here, as this is only a chunk. */
1398 skb = alloc_skb(chunklen, gfp);
1402 /* Make room for the chunk header. */
1403 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1404 chunk_hdr->type = type;
1405 chunk_hdr->flags = flags;
1406 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1408 sk = asoc ? asoc->base.sk : NULL;
1409 retval = sctp_chunkify(skb, asoc, sk, gfp);
1415 retval->chunk_hdr = chunk_hdr;
1416 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1418 /* Determine if the chunk needs to be authenticated */
1419 if (sctp_auth_send_cid(type, asoc))
1427 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1428 __u8 flags, int paylen, gfp_t gfp)
1430 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1433 struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
1434 __u8 flags, int paylen, gfp_t gfp)
1436 return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);
1439 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1440 __u8 type, __u8 flags, int paylen,
1443 struct sctp_chunk *chunk;
1445 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1447 sctp_control_set_owner_w(chunk);
1452 /* Release the memory occupied by a chunk. */
1453 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1455 BUG_ON(!list_empty(&chunk->list));
1456 list_del_init(&chunk->transmitted_list);
1458 consume_skb(chunk->skb);
1459 consume_skb(chunk->auth_chunk);
1461 SCTP_DBG_OBJCNT_DEC(chunk);
1462 kmem_cache_free(sctp_chunk_cachep, chunk);
1465 /* Possibly, free the chunk. */
1466 void sctp_chunk_free(struct sctp_chunk *chunk)
1468 /* Release our reference on the message tracker. */
1470 sctp_datamsg_put(chunk->msg);
1472 sctp_chunk_put(chunk);
1475 /* Grab a reference to the chunk. */
1476 void sctp_chunk_hold(struct sctp_chunk *ch)
1478 refcount_inc(&ch->refcnt);
1481 /* Release a reference to the chunk. */
1482 void sctp_chunk_put(struct sctp_chunk *ch)
1484 if (refcount_dec_and_test(&ch->refcnt))
1485 sctp_chunk_destroy(ch);
1488 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1491 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1493 int chunklen = ntohs(chunk->chunk_hdr->length);
1494 int padlen = SCTP_PAD4(chunklen) - chunklen;
1497 skb_put_zero(chunk->skb, padlen);
1498 target = skb_put_data(chunk->skb, data, len);
1500 /* Adjust the chunk length field. */
1501 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1502 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1507 /* Append bytes from user space to the end of a chunk. Will panic if
1508 * chunk is not big enough.
1509 * Returns a kernel err value.
1511 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1512 struct iov_iter *from)
1516 /* Make room in chunk for data. */
1517 target = skb_put(chunk->skb, len);
1519 /* Copy data (whole iovec) into chunk */
1520 if (!copy_from_iter_full(target, len, from))
1523 /* Adjust the chunk length field. */
1524 chunk->chunk_hdr->length =
1525 htons(ntohs(chunk->chunk_hdr->length) + len);
1526 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1531 /* Helper function to assign a TSN if needed. This assumes that both
1532 * the data_hdr and association have already been assigned.
1534 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1536 struct sctp_stream *stream;
1537 struct sctp_chunk *lchunk;
1538 struct sctp_datamsg *msg;
1544 /* All fragments will be on the same stream */
1545 sid = ntohs(chunk->subh.data_hdr->stream);
1546 stream = &chunk->asoc->stream;
1548 /* Now assign the sequence number to the entire message.
1549 * All fragments must have the same stream sequence number.
1552 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1553 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1556 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1557 ssn = sctp_ssn_next(stream, out, sid);
1559 ssn = sctp_ssn_peek(stream, out, sid);
1562 lchunk->subh.data_hdr->ssn = htons(ssn);
1563 lchunk->has_ssn = 1;
1567 /* Helper function to assign a TSN if needed. This assumes that both
1568 * the data_hdr and association have already been assigned.
1570 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1572 if (!chunk->has_tsn) {
1573 /* This is the last possible instant to
1576 chunk->subh.data_hdr->tsn =
1577 htonl(sctp_association_get_next_tsn(chunk->asoc));
1582 /* Create a CLOSED association to use with an incoming packet. */
1583 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1584 struct sctp_chunk *chunk,
1587 struct sctp_association *asoc;
1588 enum sctp_scope scope;
1589 struct sk_buff *skb;
1591 /* Create the bare association. */
1592 scope = sctp_scope(sctp_source(chunk));
1593 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1598 /* Create an entry for the source address of the packet. */
1599 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1605 /* Build a cookie representing asoc.
1606 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1608 static struct sctp_cookie_param *sctp_pack_cookie(
1609 const struct sctp_endpoint *ep,
1610 const struct sctp_association *asoc,
1611 const struct sctp_chunk *init_chunk,
1612 int *cookie_len, const __u8 *raw_addrs,
1615 struct sctp_signed_cookie *cookie;
1616 struct sctp_cookie_param *retval;
1617 int headersize, bodysize;
1619 /* Header size is static data prior to the actual cookie, including
1622 headersize = sizeof(struct sctp_paramhdr) +
1623 (sizeof(struct sctp_signed_cookie) -
1624 sizeof(struct sctp_cookie));
1625 bodysize = sizeof(struct sctp_cookie)
1626 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1628 /* Pad out the cookie to a multiple to make the signature
1629 * functions simpler to write.
1631 if (bodysize % SCTP_COOKIE_MULTIPLE)
1632 bodysize += SCTP_COOKIE_MULTIPLE
1633 - (bodysize % SCTP_COOKIE_MULTIPLE);
1634 *cookie_len = headersize + bodysize;
1636 /* Clear this memory since we are sending this data structure
1637 * out on the network.
1639 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1643 cookie = (struct sctp_signed_cookie *) retval->body;
1645 /* Set up the parameter header. */
1646 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1647 retval->p.length = htons(*cookie_len);
1649 /* Copy the cookie part of the association itself. */
1650 cookie->c = asoc->c;
1651 /* Save the raw address list length in the cookie. */
1652 cookie->c.raw_addr_list_len = addrs_len;
1654 /* Remember PR-SCTP capability. */
1655 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1657 /* Save adaptation indication in the cookie. */
1658 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1660 /* Set an expiration time for the cookie. */
1661 cookie->c.expiration = ktime_add(asoc->cookie_life,
1664 /* Copy the peer's init packet. */
1665 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1666 ntohs(init_chunk->chunk_hdr->length));
1668 /* Copy the raw local address list of the association. */
1669 memcpy((__u8 *)&cookie->c.peer_init[0] +
1670 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1672 if (sctp_sk(ep->base.sk)->hmac) {
1673 struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac;
1676 /* Sign the message. */
1677 err = crypto_shash_setkey(tfm, ep->secret_key,
1678 sizeof(ep->secret_key)) ?:
1679 crypto_shash_tfm_digest(tfm, (u8 *)&cookie->c, bodysize,
1694 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1695 struct sctp_association *sctp_unpack_cookie(
1696 const struct sctp_endpoint *ep,
1697 const struct sctp_association *asoc,
1698 struct sctp_chunk *chunk, gfp_t gfp,
1699 int *error, struct sctp_chunk **errp)
1701 struct sctp_association *retval = NULL;
1702 int headersize, bodysize, fixed_size;
1703 struct sctp_signed_cookie *cookie;
1704 struct sk_buff *skb = chunk->skb;
1705 struct sctp_cookie *bear_cookie;
1706 __u8 *digest = ep->digest;
1707 enum sctp_scope scope;
1711 /* Header size is static data prior to the actual cookie, including
1714 headersize = sizeof(struct sctp_chunkhdr) +
1715 (sizeof(struct sctp_signed_cookie) -
1716 sizeof(struct sctp_cookie));
1717 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1718 fixed_size = headersize + sizeof(struct sctp_cookie);
1720 /* Verify that the chunk looks like it even has a cookie.
1721 * There must be enough room for our cookie and our peer's
1724 len = ntohs(chunk->chunk_hdr->length);
1725 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1728 /* Verify that the cookie has been padded out. */
1729 if (bodysize % SCTP_COOKIE_MULTIPLE)
1732 /* Process the cookie. */
1733 cookie = chunk->subh.cookie_hdr;
1734 bear_cookie = &cookie->c;
1736 if (!sctp_sk(ep->base.sk)->hmac)
1739 /* Check the signature. */
1741 struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac;
1744 err = crypto_shash_setkey(tfm, ep->secret_key,
1745 sizeof(ep->secret_key)) ?:
1746 crypto_shash_tfm_digest(tfm, (u8 *)bear_cookie, bodysize,
1749 *error = -SCTP_IERROR_NOMEM;
1754 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1755 *error = -SCTP_IERROR_BAD_SIG;
1760 /* IG Section 2.35.2:
1761 * 3) Compare the port numbers and the verification tag contained
1762 * within the COOKIE ECHO chunk to the actual port numbers and the
1763 * verification tag within the SCTP common header of the received
1764 * packet. If these values do not match the packet MUST be silently
1767 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1768 *error = -SCTP_IERROR_BAD_TAG;
1772 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1773 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1774 *error = -SCTP_IERROR_BAD_PORTS;
1778 /* Check to see if the cookie is stale. If there is already
1779 * an association, there is no need to check cookie's expiration
1780 * for init collision case of lost COOKIE ACK.
1781 * If skb has been timestamped, then use the stamp, otherwise
1782 * use current time. This introduces a small possibility that
1783 * a cookie may be considered expired, but this would only slow
1784 * down the new association establishment instead of every packet.
1786 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1787 kt = skb_get_ktime(skb);
1789 kt = ktime_get_real();
1791 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1792 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1793 __be32 n = htonl(usecs);
1796 * Section 3.3.10.3 Stale Cookie Error (3)
1800 * Stale Cookie Error: Indicates the receipt of a valid State
1801 * Cookie that has expired.
1803 *errp = sctp_make_op_error(asoc, chunk,
1804 SCTP_ERROR_STALE_COOKIE, &n,
1807 *error = -SCTP_IERROR_STALE_COOKIE;
1809 *error = -SCTP_IERROR_NOMEM;
1814 /* Make a new base association. */
1815 scope = sctp_scope(sctp_source(chunk));
1816 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1818 *error = -SCTP_IERROR_NOMEM;
1822 /* Set up our peer's port number. */
1823 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1825 /* Populate the association from the cookie. */
1826 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1828 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1830 *error = -SCTP_IERROR_NOMEM;
1834 /* Also, add the destination address. */
1835 if (list_empty(&retval->base.bind_addr.address_list)) {
1836 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1837 sizeof(chunk->dest), SCTP_ADDR_SRC,
1841 retval->next_tsn = retval->c.initial_tsn;
1842 retval->ctsn_ack_point = retval->next_tsn - 1;
1843 retval->addip_serial = retval->c.initial_tsn;
1844 retval->strreset_outseq = retval->c.initial_tsn;
1845 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1846 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1847 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1849 /* The INIT stuff will be done by the side effects. */
1854 sctp_association_free(retval);
1859 /* Yikes! The packet is either corrupt or deliberately
1862 *error = -SCTP_IERROR_MALFORMED;
1866 /********************************************************************
1867 * 3rd Level Abstractions
1868 ********************************************************************/
1870 struct __sctp_missing {
1876 * Report a missing mandatory parameter.
1878 static int sctp_process_missing_param(const struct sctp_association *asoc,
1879 enum sctp_param paramtype,
1880 struct sctp_chunk *chunk,
1881 struct sctp_chunk **errp)
1883 struct __sctp_missing report;
1886 len = SCTP_PAD4(sizeof(report));
1888 /* Make an ERROR chunk, preparing enough room for
1889 * returning multiple unknown parameters.
1892 *errp = sctp_make_op_error_space(asoc, chunk, len);
1895 report.num_missing = htonl(1);
1896 report.type = paramtype;
1897 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1899 sctp_addto_chunk(*errp, sizeof(report), &report);
1902 /* Stop processing this chunk. */
1906 /* Report an Invalid Mandatory Parameter. */
1907 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1908 struct sctp_chunk *chunk,
1909 struct sctp_chunk **errp)
1911 /* Invalid Mandatory Parameter Error has no payload. */
1914 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1917 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1919 /* Stop processing this chunk. */
1923 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1924 struct sctp_paramhdr *param,
1925 const struct sctp_chunk *chunk,
1926 struct sctp_chunk **errp)
1928 /* This is a fatal error. Any accumulated non-fatal errors are
1932 sctp_chunk_free(*errp);
1934 /* Create an error chunk and fill it in with our payload. */
1935 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1941 /* Do not attempt to handle the HOST_NAME parm. However, do
1942 * send back an indicator to the peer.
1944 static int sctp_process_hn_param(const struct sctp_association *asoc,
1945 union sctp_params param,
1946 struct sctp_chunk *chunk,
1947 struct sctp_chunk **errp)
1949 __u16 len = ntohs(param.p->length);
1951 /* Processing of the HOST_NAME parameter will generate an
1952 * ABORT. If we've accumulated any non-fatal errors, they
1953 * would be unrecognized parameters and we should not include
1954 * them in the ABORT.
1957 sctp_chunk_free(*errp);
1959 *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
1962 /* Stop processing this chunk. */
1966 static int sctp_verify_ext_param(struct net *net,
1967 const struct sctp_endpoint *ep,
1968 union sctp_params param)
1970 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1971 int have_asconf = 0;
1975 for (i = 0; i < num_ext; i++) {
1976 switch (param.ext->chunks[i]) {
1980 case SCTP_CID_ASCONF:
1981 case SCTP_CID_ASCONF_ACK:
1987 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1988 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1989 * only if ADD-IP is turned on and we are not backward-compatible
1992 if (net->sctp.addip_noauth)
1995 if (ep->asconf_enable && !have_auth && have_asconf)
2001 static void sctp_process_ext_param(struct sctp_association *asoc,
2002 union sctp_params param)
2004 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2007 for (i = 0; i < num_ext; i++) {
2008 switch (param.ext->chunks[i]) {
2009 case SCTP_CID_RECONF:
2010 if (asoc->ep->reconf_enable)
2011 asoc->peer.reconf_capable = 1;
2013 case SCTP_CID_FWD_TSN:
2014 if (asoc->ep->prsctp_enable)
2015 asoc->peer.prsctp_capable = 1;
2018 /* if the peer reports AUTH, assume that he
2021 if (asoc->ep->auth_enable)
2022 asoc->peer.auth_capable = 1;
2024 case SCTP_CID_ASCONF:
2025 case SCTP_CID_ASCONF_ACK:
2026 if (asoc->ep->asconf_enable)
2027 asoc->peer.asconf_capable = 1;
2029 case SCTP_CID_I_DATA:
2030 if (asoc->ep->intl_enable)
2031 asoc->peer.intl_capable = 1;
2039 /* RFC 3.2.1 & the Implementers Guide 2.2.
2041 * The Parameter Types are encoded such that the
2042 * highest-order two bits specify the action that must be
2043 * taken if the processing endpoint does not recognize the
2046 * 00 - Stop processing this parameter; do not process any further
2047 * parameters within this chunk
2049 * 01 - Stop processing this parameter, do not process any further
2050 * parameters within this chunk, and report the unrecognized
2051 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2053 * 10 - Skip this parameter and continue processing.
2055 * 11 - Skip this parameter and continue processing but
2056 * report the unrecognized parameter in an
2057 * 'Unrecognized Parameter' ERROR chunk.
2060 * SCTP_IERROR_NO_ERROR - continue with the chunk
2061 * SCTP_IERROR_ERROR - stop and report an error.
2062 * SCTP_IERROR_NOMEME - out of memory.
2064 static enum sctp_ierror sctp_process_unk_param(
2065 const struct sctp_association *asoc,
2066 union sctp_params param,
2067 struct sctp_chunk *chunk,
2068 struct sctp_chunk **errp)
2070 int retval = SCTP_IERROR_NO_ERROR;
2072 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2073 case SCTP_PARAM_ACTION_DISCARD:
2074 retval = SCTP_IERROR_ERROR;
2076 case SCTP_PARAM_ACTION_SKIP:
2078 case SCTP_PARAM_ACTION_DISCARD_ERR:
2079 retval = SCTP_IERROR_ERROR;
2081 case SCTP_PARAM_ACTION_SKIP_ERR:
2082 /* Make an ERROR chunk, preparing enough room for
2083 * returning multiple unknown parameters.
2086 *errp = sctp_make_op_error_limited(asoc, chunk);
2088 /* If there is no memory for generating the
2089 * ERROR report as specified, an ABORT will be
2090 * triggered to the peer and the association
2091 * won't be established.
2093 retval = SCTP_IERROR_NOMEM;
2098 if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2099 ntohs(param.p->length)))
2100 sctp_addto_chunk(*errp, ntohs(param.p->length),
2110 /* Verify variable length parameters
2112 * SCTP_IERROR_ABORT - trigger an ABORT
2113 * SCTP_IERROR_NOMEM - out of memory (abort)
2114 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2115 * SCTP_IERROR_NO_ERROR - continue with the chunk
2117 static enum sctp_ierror sctp_verify_param(struct net *net,
2118 const struct sctp_endpoint *ep,
2119 const struct sctp_association *asoc,
2120 union sctp_params param,
2122 struct sctp_chunk *chunk,
2123 struct sctp_chunk **err_chunk)
2125 struct sctp_hmac_algo_param *hmacs;
2126 int retval = SCTP_IERROR_NO_ERROR;
2127 __u16 n_elt, id = 0;
2130 /* FIXME - This routine is not looking at each parameter per the
2131 * chunk type, i.e., unrecognized parameters should be further
2132 * identified based on the chunk id.
2135 switch (param.p->type) {
2136 case SCTP_PARAM_IPV4_ADDRESS:
2137 case SCTP_PARAM_IPV6_ADDRESS:
2138 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2139 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2140 case SCTP_PARAM_STATE_COOKIE:
2141 case SCTP_PARAM_HEARTBEAT_INFO:
2142 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2143 case SCTP_PARAM_ECN_CAPABLE:
2144 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2147 case SCTP_PARAM_SUPPORTED_EXT:
2148 if (!sctp_verify_ext_param(net, ep, param))
2149 return SCTP_IERROR_ABORT;
2152 case SCTP_PARAM_SET_PRIMARY:
2153 if (!ep->asconf_enable)
2156 if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) +
2157 sizeof(struct sctp_paramhdr)) {
2158 sctp_process_inv_paramlength(asoc, param.p,
2160 retval = SCTP_IERROR_ABORT;
2164 case SCTP_PARAM_HOST_NAME_ADDRESS:
2165 /* Tell the peer, we won't support this param. */
2166 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2167 retval = SCTP_IERROR_ABORT;
2170 case SCTP_PARAM_FWD_TSN_SUPPORT:
2171 if (ep->prsctp_enable)
2175 case SCTP_PARAM_RANDOM:
2176 if (!ep->auth_enable)
2179 /* SCTP-AUTH: Secion 6.1
2180 * If the random number is not 32 byte long the association
2181 * MUST be aborted. The ABORT chunk SHOULD contain the error
2182 * cause 'Protocol Violation'.
2184 if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
2185 sizeof(struct sctp_paramhdr)) {
2186 sctp_process_inv_paramlength(asoc, param.p,
2188 retval = SCTP_IERROR_ABORT;
2192 case SCTP_PARAM_CHUNKS:
2193 if (!ep->auth_enable)
2196 /* SCTP-AUTH: Section 3.2
2197 * The CHUNKS parameter MUST be included once in the INIT or
2198 * INIT-ACK chunk if the sender wants to receive authenticated
2199 * chunks. Its maximum length is 260 bytes.
2201 if (260 < ntohs(param.p->length)) {
2202 sctp_process_inv_paramlength(asoc, param.p,
2204 retval = SCTP_IERROR_ABORT;
2208 case SCTP_PARAM_HMAC_ALGO:
2209 if (!ep->auth_enable)
2212 hmacs = (struct sctp_hmac_algo_param *)param.p;
2213 n_elt = (ntohs(param.p->length) -
2214 sizeof(struct sctp_paramhdr)) >> 1;
2216 /* SCTP-AUTH: Section 6.1
2217 * The HMAC algorithm based on SHA-1 MUST be supported and
2218 * included in the HMAC-ALGO parameter.
2220 for (i = 0; i < n_elt; i++) {
2221 id = ntohs(hmacs->hmac_ids[i]);
2223 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2227 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2228 sctp_process_inv_paramlength(asoc, param.p, chunk,
2230 retval = SCTP_IERROR_ABORT;
2235 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2236 __func__, ntohs(param.p->type), cid);
2238 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2244 /* Verify the INIT packet before we process it. */
2245 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2246 const struct sctp_association *asoc, enum sctp_cid cid,
2247 struct sctp_init_chunk *peer_init,
2248 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2250 union sctp_params param;
2251 bool has_cookie = false;
2254 /* Check for missing mandatory parameters. Note: Initial TSN is
2255 * also mandatory, but is not checked here since the valid range
2256 * is 0..2**32-1. RFC4960, section 3.3.3.
2258 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2259 peer_init->init_hdr.num_inbound_streams == 0 ||
2260 peer_init->init_hdr.init_tag == 0 ||
2261 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2262 return sctp_process_inv_mandatory(asoc, chunk, errp);
2264 sctp_walk_params(param, peer_init, init_hdr.params) {
2265 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2269 /* There is a possibility that a parameter length was bad and
2270 * in that case we would have stoped walking the parameters.
2271 * The current param.p would point at the bad one.
2272 * Current consensus on the mailing list is to generate a PROTOCOL
2273 * VIOLATION error. We build the ERROR chunk here and let the normal
2274 * error handling code build and send the packet.
2276 if (param.v != (void *)chunk->chunk_end)
2277 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2279 /* The only missing mandatory param possible today is
2280 * the state cookie for an INIT-ACK chunk.
2282 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2283 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2286 /* Verify all the variable length parameters */
2287 sctp_walk_params(param, peer_init, init_hdr.params) {
2288 result = sctp_verify_param(net, ep, asoc, param, cid,
2291 case SCTP_IERROR_ABORT:
2292 case SCTP_IERROR_NOMEM:
2294 case SCTP_IERROR_ERROR:
2296 case SCTP_IERROR_NO_ERROR:
2301 } /* for (loop through all parameters) */
2306 /* Unpack the parameters in an INIT packet into an association.
2307 * Returns 0 on failure, else success.
2308 * FIXME: This is an association method.
2310 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2311 const union sctp_addr *peer_addr,
2312 struct sctp_init_chunk *peer_init, gfp_t gfp)
2314 struct sctp_transport *transport;
2315 struct list_head *pos, *temp;
2316 union sctp_params param;
2317 union sctp_addr addr;
2321 /* We must include the address that the INIT packet came from.
2322 * This is the only address that matters for an INIT packet.
2323 * When processing a COOKIE ECHO, we retrieve the from address
2324 * of the INIT from the cookie.
2327 /* This implementation defaults to making the first transport
2328 * added as the primary transport. The source address seems to
2329 * be a better choice than any of the embedded addresses.
2331 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2334 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2337 /* Process the initialization parameters. */
2338 sctp_walk_params(param, peer_init, init_hdr.params) {
2340 (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2341 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2342 af = sctp_get_af_specific(param_type2af(param.p->type));
2343 if (!af->from_addr_param(&addr, param.addr,
2344 chunk->sctp_hdr->source, 0))
2346 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2350 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2354 /* source address of chunk may not match any valid address */
2358 /* AUTH: After processing the parameters, make sure that we
2359 * have all the required info to potentially do authentications.
2361 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2362 !asoc->peer.peer_hmacs))
2363 asoc->peer.auth_capable = 0;
2365 /* In a non-backward compatible mode, if the peer claims
2366 * support for ADD-IP but not AUTH, the ADD-IP spec states
2367 * that we MUST ABORT the association. Section 6. The section
2368 * also give us an option to silently ignore the packet, which
2369 * is what we'll do here.
2371 if (!asoc->base.net->sctp.addip_noauth &&
2372 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2373 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2375 SCTP_PARAM_SET_PRIMARY);
2376 asoc->peer.asconf_capable = 0;
2380 /* Walk list of transports, removing transports in the UNKNOWN state. */
2381 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2382 transport = list_entry(pos, struct sctp_transport, transports);
2383 if (transport->state == SCTP_UNKNOWN) {
2384 sctp_assoc_rm_peer(asoc, transport);
2388 /* The fixed INIT headers are always in network byte
2391 asoc->peer.i.init_tag =
2392 ntohl(peer_init->init_hdr.init_tag);
2393 asoc->peer.i.a_rwnd =
2394 ntohl(peer_init->init_hdr.a_rwnd);
2395 asoc->peer.i.num_outbound_streams =
2396 ntohs(peer_init->init_hdr.num_outbound_streams);
2397 asoc->peer.i.num_inbound_streams =
2398 ntohs(peer_init->init_hdr.num_inbound_streams);
2399 asoc->peer.i.initial_tsn =
2400 ntohl(peer_init->init_hdr.initial_tsn);
2402 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2404 /* Apply the upper bounds for output streams based on peer's
2405 * number of inbound streams.
2407 if (asoc->c.sinit_num_ostreams >
2408 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2409 asoc->c.sinit_num_ostreams =
2410 ntohs(peer_init->init_hdr.num_inbound_streams);
2413 if (asoc->c.sinit_max_instreams >
2414 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2415 asoc->c.sinit_max_instreams =
2416 ntohs(peer_init->init_hdr.num_outbound_streams);
2419 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2420 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2422 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2423 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2425 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2426 * high (for example, implementations MAY use the size of the receiver
2427 * advertised window).
2429 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2431 transport->ssthresh = asoc->peer.i.a_rwnd;
2434 /* Set up the TSN tracking pieces. */
2435 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2436 asoc->peer.i.initial_tsn, gfp))
2439 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2441 * The stream sequence number in all the streams shall start
2442 * from 0 when the association is established. Also, when the
2443 * stream sequence number reaches the value 65535 the next
2444 * stream sequence number shall be set to 0.
2447 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2448 asoc->c.sinit_max_instreams, gfp))
2451 /* Update frag_point when stream_interleave may get changed. */
2452 sctp_assoc_update_frag_point(asoc);
2454 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2457 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2459 * When an endpoint has an ASCONF signaled change to be sent to the
2460 * remote endpoint it should do the following:
2462 * A2) A serial number should be assigned to the Chunk. The serial
2463 * number should be a monotonically increasing number. All serial
2464 * numbers are defined to be initialized at the start of the
2465 * association to the same value as the Initial TSN.
2467 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2471 /* Release the transport structures. */
2472 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2473 transport = list_entry(pos, struct sctp_transport, transports);
2474 if (transport->state != SCTP_ACTIVE)
2475 sctp_assoc_rm_peer(asoc, transport);
2483 /* Update asoc with the option described in param.
2485 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2487 * asoc is the association to update.
2488 * param is the variable length parameter to use for update.
2489 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2490 * If the current packet is an INIT we want to minimize the amount of
2491 * work we do. In particular, we should not build transport
2492 * structures for the addresses.
2494 static int sctp_process_param(struct sctp_association *asoc,
2495 union sctp_params param,
2496 const union sctp_addr *peer_addr,
2499 struct sctp_endpoint *ep = asoc->ep;
2500 union sctp_addr_param *addr_param;
2501 struct net *net = asoc->base.net;
2502 struct sctp_transport *t;
2503 enum sctp_scope scope;
2504 union sctp_addr addr;
2510 /* We maintain all INIT parameters in network byte order all the
2511 * time. This allows us to not worry about whether the parameters
2512 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2514 switch (param.p->type) {
2515 case SCTP_PARAM_IPV6_ADDRESS:
2516 if (PF_INET6 != asoc->base.sk->sk_family)
2520 case SCTP_PARAM_IPV4_ADDRESS:
2521 /* v4 addresses are not allowed on v6-only socket */
2522 if (ipv6_only_sock(asoc->base.sk))
2525 af = sctp_get_af_specific(param_type2af(param.p->type));
2526 if (!af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0))
2528 scope = sctp_scope(peer_addr);
2529 if (sctp_in_scope(net, &addr, scope))
2530 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2534 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2535 if (!net->sctp.cookie_preserve_enable)
2538 stale = ntohl(param.life->lifespan_increment);
2540 /* Suggested Cookie Life span increment's unit is msec,
2543 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2546 case SCTP_PARAM_HOST_NAME_ADDRESS:
2547 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2550 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2551 /* Turn off the default values first so we'll know which
2552 * ones are really set by the peer.
2554 asoc->peer.ipv4_address = 0;
2555 asoc->peer.ipv6_address = 0;
2557 /* Assume that peer supports the address family
2558 * by which it sends a packet.
2560 if (peer_addr->sa.sa_family == AF_INET6)
2561 asoc->peer.ipv6_address = 1;
2562 else if (peer_addr->sa.sa_family == AF_INET)
2563 asoc->peer.ipv4_address = 1;
2565 /* Cycle through address types; avoid divide by 0. */
2566 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2568 sat /= sizeof(__u16);
2570 for (i = 0; i < sat; ++i) {
2571 switch (param.sat->types[i]) {
2572 case SCTP_PARAM_IPV4_ADDRESS:
2573 asoc->peer.ipv4_address = 1;
2576 case SCTP_PARAM_IPV6_ADDRESS:
2577 if (PF_INET6 == asoc->base.sk->sk_family)
2578 asoc->peer.ipv6_address = 1;
2581 case SCTP_PARAM_HOST_NAME_ADDRESS:
2582 asoc->peer.hostname_address = 1;
2585 default: /* Just ignore anything else. */
2591 case SCTP_PARAM_STATE_COOKIE:
2592 asoc->peer.cookie_len =
2593 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2594 kfree(asoc->peer.cookie);
2595 asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
2596 if (!asoc->peer.cookie)
2600 case SCTP_PARAM_HEARTBEAT_INFO:
2601 /* Would be odd to receive, but it causes no problems. */
2604 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2605 /* Rejected during verify stage. */
2608 case SCTP_PARAM_ECN_CAPABLE:
2609 if (asoc->ep->ecn_enable) {
2610 asoc->peer.ecn_capable = 1;
2617 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2618 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2621 case SCTP_PARAM_SET_PRIMARY:
2622 if (!ep->asconf_enable)
2625 addr_param = param.v + sizeof(struct sctp_addip_param);
2627 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2631 if (!af->from_addr_param(&addr, addr_param,
2632 htons(asoc->peer.port), 0))
2635 if (!af->addr_valid(&addr, NULL, NULL))
2638 t = sctp_assoc_lookup_paddr(asoc, &addr);
2642 sctp_assoc_set_primary(asoc, t);
2645 case SCTP_PARAM_SUPPORTED_EXT:
2646 sctp_process_ext_param(asoc, param);
2649 case SCTP_PARAM_FWD_TSN_SUPPORT:
2650 if (asoc->ep->prsctp_enable) {
2651 asoc->peer.prsctp_capable = 1;
2657 case SCTP_PARAM_RANDOM:
2658 if (!ep->auth_enable)
2661 /* Save peer's random parameter */
2662 kfree(asoc->peer.peer_random);
2663 asoc->peer.peer_random = kmemdup(param.p,
2664 ntohs(param.p->length), gfp);
2665 if (!asoc->peer.peer_random) {
2671 case SCTP_PARAM_HMAC_ALGO:
2672 if (!ep->auth_enable)
2675 /* Save peer's HMAC list */
2676 kfree(asoc->peer.peer_hmacs);
2677 asoc->peer.peer_hmacs = kmemdup(param.p,
2678 ntohs(param.p->length), gfp);
2679 if (!asoc->peer.peer_hmacs) {
2684 /* Set the default HMAC the peer requested*/
2685 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2688 case SCTP_PARAM_CHUNKS:
2689 if (!ep->auth_enable)
2692 kfree(asoc->peer.peer_chunks);
2693 asoc->peer.peer_chunks = kmemdup(param.p,
2694 ntohs(param.p->length), gfp);
2695 if (!asoc->peer.peer_chunks)
2700 /* Any unrecognized parameters should have been caught
2701 * and handled by sctp_verify_param() which should be
2702 * called prior to this routine. Simply log the error
2705 pr_debug("%s: ignoring param:%d for association:%p.\n",
2706 __func__, ntohs(param.p->type), asoc);
2713 /* Select a new verification tag. */
2714 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2716 /* I believe that this random number generator complies with RFC1750.
2717 * A tag of 0 is reserved for special cases (e.g. INIT).
2722 get_random_bytes(&x, sizeof(__u32));
2728 /* Select an initial TSN to send during startup. */
2729 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2733 get_random_bytes(&retval, sizeof(__u32));
2738 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2740 * 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
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2746 * | Address Parameter |
2747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2748 * | ASCONF Parameter #1 |
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * | ASCONF Parameter #N |
2755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2757 * Address Parameter and other parameter will not be wrapped in this function
2759 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2760 union sctp_addr *addr,
2763 struct sctp_addiphdr asconf;
2764 struct sctp_chunk *retval;
2765 int length = sizeof(asconf) + vparam_len;
2766 union sctp_addr_param addrparam;
2768 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2770 addrlen = af->to_addr_param(addr, &addrparam);
2775 /* Create the chunk. */
2776 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2781 asconf.serial = htonl(asoc->addip_serial++);
2783 retval->subh.addip_hdr =
2784 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2785 retval->param_hdr.v =
2786 sctp_addto_chunk(retval, addrlen, &addrparam);
2792 * 3.2.1 Add IP Address
2794 * 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
2795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2796 * | Type = 0xC001 | Length = Variable |
2797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2798 * | ASCONF-Request Correlation ID |
2799 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2800 * | Address Parameter |
2801 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * 3.2.2 Delete IP Address
2805 * 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
2806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 * | Type = 0xC002 | Length = Variable |
2808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2809 * | ASCONF-Request Correlation ID |
2810 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2811 * | Address Parameter |
2812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2815 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2816 union sctp_addr *laddr,
2817 struct sockaddr *addrs,
2818 int addrcnt, __be16 flags)
2820 union sctp_addr_param addr_param;
2821 struct sctp_addip_param param;
2822 int paramlen = sizeof(param);
2823 struct sctp_chunk *retval;
2824 int addr_param_len = 0;
2825 union sctp_addr *addr;
2826 int totallen = 0, i;
2831 /* Get total length of all the address parameters. */
2833 for (i = 0; i < addrcnt; i++) {
2835 af = sctp_get_af_specific(addr->v4.sin_family);
2836 addr_param_len = af->to_addr_param(addr, &addr_param);
2838 totallen += paramlen;
2839 totallen += addr_param_len;
2841 addr_buf += af->sockaddr_len;
2842 if (asoc->asconf_addr_del_pending && !del_pickup) {
2843 /* reuse the parameter length from the same scope one */
2844 totallen += paramlen;
2845 totallen += addr_param_len;
2848 pr_debug("%s: picked same-scope del_pending addr, "
2849 "totallen for all addresses is %d\n",
2850 __func__, totallen);
2854 /* Create an asconf chunk with the required length. */
2855 retval = sctp_make_asconf(asoc, laddr, totallen);
2859 /* Add the address parameters to the asconf chunk. */
2861 for (i = 0; i < addrcnt; i++) {
2863 af = sctp_get_af_specific(addr->v4.sin_family);
2864 addr_param_len = af->to_addr_param(addr, &addr_param);
2865 param.param_hdr.type = flags;
2866 param.param_hdr.length = htons(paramlen + addr_param_len);
2867 param.crr_id = htonl(i);
2869 sctp_addto_chunk(retval, paramlen, ¶m);
2870 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2872 addr_buf += af->sockaddr_len;
2874 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2875 addr = asoc->asconf_addr_del_pending;
2876 af = sctp_get_af_specific(addr->v4.sin_family);
2877 addr_param_len = af->to_addr_param(addr, &addr_param);
2878 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2879 param.param_hdr.length = htons(paramlen + addr_param_len);
2880 param.crr_id = htonl(i);
2882 sctp_addto_chunk(retval, paramlen, ¶m);
2883 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2889 * 3.2.4 Set Primary IP Address
2891 * 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
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2893 * | Type =0xC004 | Length = Variable |
2894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * | ASCONF-Request Correlation ID |
2896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2897 * | Address Parameter |
2898 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2900 * Create an ASCONF chunk with Set Primary IP address parameter.
2902 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2903 union sctp_addr *addr)
2905 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2906 union sctp_addr_param addrparam;
2907 struct sctp_addip_param param;
2908 struct sctp_chunk *retval;
2909 int len = sizeof(param);
2912 addrlen = af->to_addr_param(addr, &addrparam);
2917 /* Create the chunk and make asconf header. */
2918 retval = sctp_make_asconf(asoc, addr, len);
2922 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2923 param.param_hdr.length = htons(len);
2926 sctp_addto_chunk(retval, sizeof(param), ¶m);
2927 sctp_addto_chunk(retval, addrlen, &addrparam);
2932 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2934 * 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
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2936 * | Type = 0x80 | Chunk Flags | Chunk Length |
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2939 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2940 * | ASCONF Parameter Response#1 |
2941 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2946 * | ASCONF Parameter Response#N |
2947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2949 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2951 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2952 __u32 serial, int vparam_len)
2954 struct sctp_addiphdr asconf;
2955 struct sctp_chunk *retval;
2956 int length = sizeof(asconf) + vparam_len;
2958 /* Create the chunk. */
2959 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2964 asconf.serial = htonl(serial);
2966 retval->subh.addip_hdr =
2967 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2972 /* Add response parameters to an ASCONF_ACK chunk. */
2973 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2975 struct sctp_addip_param *asconf_param)
2977 struct sctp_addip_param ack_param;
2978 struct sctp_errhdr err_param;
2979 int asconf_param_len = 0;
2980 int err_param_len = 0;
2981 __be16 response_type;
2983 if (SCTP_ERROR_NO_ERROR == err_code) {
2984 response_type = SCTP_PARAM_SUCCESS_REPORT;
2986 response_type = SCTP_PARAM_ERR_CAUSE;
2987 err_param_len = sizeof(err_param);
2990 ntohs(asconf_param->param_hdr.length);
2993 /* Add Success Indication or Error Cause Indication parameter. */
2994 ack_param.param_hdr.type = response_type;
2995 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2998 ack_param.crr_id = crr_id;
2999 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
3001 if (SCTP_ERROR_NO_ERROR == err_code)
3004 /* Add Error Cause parameter. */
3005 err_param.cause = err_code;
3006 err_param.length = htons(err_param_len + asconf_param_len);
3007 sctp_addto_chunk(chunk, err_param_len, &err_param);
3009 /* Add the failed TLV copied from ASCONF chunk. */
3011 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3014 /* Process a asconf parameter. */
3015 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3016 struct sctp_chunk *asconf,
3017 struct sctp_addip_param *asconf_param)
3019 union sctp_addr_param *addr_param;
3020 struct sctp_transport *peer;
3021 union sctp_addr addr;
3024 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3026 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3027 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3028 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3029 return SCTP_ERROR_UNKNOWN_PARAM;
3031 switch (addr_param->p.type) {
3032 case SCTP_PARAM_IPV6_ADDRESS:
3033 if (!asoc->peer.ipv6_address)
3034 return SCTP_ERROR_DNS_FAILED;
3036 case SCTP_PARAM_IPV4_ADDRESS:
3037 if (!asoc->peer.ipv4_address)
3038 return SCTP_ERROR_DNS_FAILED;
3041 return SCTP_ERROR_DNS_FAILED;
3044 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3046 return SCTP_ERROR_DNS_FAILED;
3048 if (!af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0))
3049 return SCTP_ERROR_DNS_FAILED;
3051 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3052 * or multicast address.
3053 * (note: wildcard is permitted and requires special handling so
3054 * make sure we check for that)
3056 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3057 return SCTP_ERROR_DNS_FAILED;
3059 switch (asconf_param->param_hdr.type) {
3060 case SCTP_PARAM_ADD_IP:
3062 * If the address 0.0.0.0 or ::0 is provided, the source
3063 * address of the packet MUST be added.
3065 if (af->is_any(&addr))
3066 memcpy(&addr, &asconf->source, sizeof(addr));
3068 if (security_sctp_bind_connect(asoc->ep->base.sk,
3070 (struct sockaddr *)&addr,
3072 return SCTP_ERROR_REQ_REFUSED;
3074 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3075 * request and does not have the local resources to add this
3076 * new address to the association, it MUST return an Error
3077 * Cause TLV set to the new error code 'Operation Refused
3078 * Due to Resource Shortage'.
3081 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3083 return SCTP_ERROR_RSRC_LOW;
3085 /* Start the heartbeat timer. */
3086 sctp_transport_reset_hb_timer(peer);
3087 asoc->new_transport = peer;
3089 case SCTP_PARAM_DEL_IP:
3090 /* ADDIP 4.3 D7) If a request is received to delete the
3091 * last remaining IP address of a peer endpoint, the receiver
3092 * MUST send an Error Cause TLV with the error cause set to the
3093 * new error code 'Request to Delete Last Remaining IP Address'.
3095 if (asoc->peer.transport_count == 1)
3096 return SCTP_ERROR_DEL_LAST_IP;
3098 /* ADDIP 4.3 D8) If a request is received to delete an IP
3099 * address which is also the source address of the IP packet
3100 * which contained the ASCONF chunk, the receiver MUST reject
3101 * this request. To reject the request the receiver MUST send
3102 * an Error Cause TLV set to the new error code 'Request to
3103 * Delete Source IP Address'
3105 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3106 return SCTP_ERROR_DEL_SRC_IP;
3109 * If the address 0.0.0.0 or ::0 is provided, all
3110 * addresses of the peer except the source address of the
3111 * packet MUST be deleted.
3113 if (af->is_any(&addr)) {
3114 sctp_assoc_set_primary(asoc, asconf->transport);
3115 sctp_assoc_del_nonprimary_peers(asoc,
3117 return SCTP_ERROR_NO_ERROR;
3120 /* If the address is not part of the association, the
3121 * ASCONF-ACK with Error Cause Indication Parameter
3122 * which including cause of Unresolvable Address should
3125 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3127 return SCTP_ERROR_DNS_FAILED;
3129 sctp_assoc_rm_peer(asoc, peer);
3131 case SCTP_PARAM_SET_PRIMARY:
3132 /* ADDIP Section 4.2.4
3133 * If the address 0.0.0.0 or ::0 is provided, the receiver
3134 * MAY mark the source address of the packet as its
3137 if (af->is_any(&addr))
3138 memcpy(&addr, sctp_source(asconf), sizeof(addr));
3140 if (security_sctp_bind_connect(asoc->ep->base.sk,
3141 SCTP_PARAM_SET_PRIMARY,
3142 (struct sockaddr *)&addr,
3144 return SCTP_ERROR_REQ_REFUSED;
3146 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3148 return SCTP_ERROR_DNS_FAILED;
3150 sctp_assoc_set_primary(asoc, peer);
3154 return SCTP_ERROR_NO_ERROR;
3157 /* Verify the ASCONF packet before we process it. */
3158 bool sctp_verify_asconf(const struct sctp_association *asoc,
3159 struct sctp_chunk *chunk, bool addr_param_needed,
3160 struct sctp_paramhdr **errp)
3162 struct sctp_addip_chunk *addip;
3163 bool addr_param_seen = false;
3164 union sctp_params param;
3166 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3167 sctp_walk_params(param, addip, addip_hdr.params) {
3168 size_t length = ntohs(param.p->length);
3171 switch (param.p->type) {
3172 case SCTP_PARAM_ERR_CAUSE:
3174 case SCTP_PARAM_IPV4_ADDRESS:
3175 if (length != sizeof(struct sctp_ipv4addr_param))
3177 /* ensure there is only one addr param and it's in the
3178 * beginning of addip_hdr params, or we reject it.
3180 if (param.v != addip->addip_hdr.params)
3182 addr_param_seen = true;
3184 case SCTP_PARAM_IPV6_ADDRESS:
3185 if (length != sizeof(struct sctp_ipv6addr_param))
3187 if (param.v != addip->addip_hdr.params)
3189 addr_param_seen = true;
3191 case SCTP_PARAM_ADD_IP:
3192 case SCTP_PARAM_DEL_IP:
3193 case SCTP_PARAM_SET_PRIMARY:
3194 /* In ASCONF chunks, these need to be first. */
3195 if (addr_param_needed && !addr_param_seen)
3197 length = ntohs(param.addip->param_hdr.length);
3198 if (length < sizeof(struct sctp_addip_param) +
3202 case SCTP_PARAM_SUCCESS_REPORT:
3203 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3204 if (length != sizeof(struct sctp_addip_param))
3208 /* This is unkown to us, reject! */
3213 /* Remaining sanity checks. */
3214 if (addr_param_needed && !addr_param_seen)
3216 if (!addr_param_needed && addr_param_seen)
3218 if (param.v != chunk->chunk_end)
3224 /* Process an incoming ASCONF chunk with the next expected serial no. and
3225 * return an ASCONF_ACK chunk to be sent in response.
3227 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3228 struct sctp_chunk *asconf)
3230 union sctp_addr_param *addr_param;
3231 struct sctp_addip_chunk *addip;
3232 struct sctp_chunk *asconf_ack;
3233 bool all_param_pass = true;
3234 struct sctp_addiphdr *hdr;
3235 int length = 0, chunk_len;
3236 union sctp_params param;
3240 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3241 chunk_len = ntohs(asconf->chunk_hdr->length) -
3242 sizeof(struct sctp_chunkhdr);
3243 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3244 serial = ntohl(hdr->serial);
3246 /* Skip the addiphdr and store a pointer to address parameter. */
3247 length = sizeof(*hdr);
3248 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3249 chunk_len -= length;
3251 /* Skip the address parameter and store a pointer to the first
3254 length = ntohs(addr_param->p.length);
3255 chunk_len -= length;
3257 /* create an ASCONF_ACK chunk.
3258 * Based on the definitions of parameters, we know that the size of
3259 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3262 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3266 /* Process the TLVs contained within the ASCONF chunk. */
3267 sctp_walk_params(param, addip, addip_hdr.params) {
3268 /* Skip preceeding address parameters. */
3269 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3270 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3273 err_code = sctp_process_asconf_param(asoc, asconf,
3276 * If an error response is received for a TLV parameter,
3277 * all TLVs with no response before the failed TLV are
3278 * considered successful if not reported. All TLVs after
3279 * the failed response are considered unsuccessful unless
3280 * a specific success indication is present for the parameter.
3282 if (err_code != SCTP_ERROR_NO_ERROR)
3283 all_param_pass = false;
3284 if (!all_param_pass)
3285 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3286 err_code, param.addip);
3288 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3289 * an IP address sends an 'Out of Resource' in its response, it
3290 * MUST also fail any subsequent add or delete requests bundled
3293 if (err_code == SCTP_ERROR_RSRC_LOW)
3297 asoc->peer.addip_serial++;
3299 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3300 * after freeing the reference to old asconf ack if any.
3303 sctp_chunk_hold(asconf_ack);
3304 list_add_tail(&asconf_ack->transmitted_list,
3305 &asoc->asconf_ack_list);
3311 /* Process a asconf parameter that is successfully acked. */
3312 static void sctp_asconf_param_success(struct sctp_association *asoc,
3313 struct sctp_addip_param *asconf_param)
3315 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3316 union sctp_addr_param *addr_param;
3317 struct sctp_sockaddr_entry *saddr;
3318 struct sctp_transport *transport;
3319 union sctp_addr addr;
3322 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3324 /* We have checked the packet before, so we do not check again. */
3325 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3326 if (!af->from_addr_param(&addr, addr_param, htons(bp->port), 0))
3329 switch (asconf_param->param_hdr.type) {
3330 case SCTP_PARAM_ADD_IP:
3331 /* This is always done in BH context with a socket lock
3332 * held, so the list can not change.
3335 list_for_each_entry(saddr, &bp->address_list, list) {
3336 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3337 saddr->state = SCTP_ADDR_SRC;
3340 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3342 sctp_transport_dst_release(transport);
3345 case SCTP_PARAM_DEL_IP:
3347 sctp_del_bind_addr(bp, &addr);
3348 if (asoc->asconf_addr_del_pending != NULL &&
3349 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3350 kfree(asoc->asconf_addr_del_pending);
3351 asoc->asconf_addr_del_pending = NULL;
3354 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3356 sctp_transport_dst_release(transport);
3364 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3365 * for the given asconf parameter. If there is no response for this parameter,
3366 * return the error code based on the third argument 'no_err'.
3368 * A7) If an error response is received for a TLV parameter, all TLVs with no
3369 * response before the failed TLV are considered successful if not reported.
3370 * All TLVs after the failed response are considered unsuccessful unless a
3371 * specific success indication is present for the parameter.
3373 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3374 struct sctp_addip_param *asconf_param,
3377 struct sctp_addip_param *asconf_ack_param;
3378 struct sctp_errhdr *err_param;
3384 err_code = SCTP_ERROR_NO_ERROR;
3386 err_code = SCTP_ERROR_REQ_REFUSED;
3388 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3389 sizeof(struct sctp_chunkhdr);
3391 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3392 * the first asconf_ack parameter.
3394 length = sizeof(struct sctp_addiphdr);
3395 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3397 asconf_ack_len -= length;
3399 while (asconf_ack_len > 0) {
3400 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3401 switch (asconf_ack_param->param_hdr.type) {
3402 case SCTP_PARAM_SUCCESS_REPORT:
3403 return SCTP_ERROR_NO_ERROR;
3404 case SCTP_PARAM_ERR_CAUSE:
3405 length = sizeof(*asconf_ack_param);
3406 err_param = (void *)asconf_ack_param + length;
3407 asconf_ack_len -= length;
3408 if (asconf_ack_len > 0)
3409 return err_param->cause;
3411 return SCTP_ERROR_INV_PARAM;
3414 return SCTP_ERROR_INV_PARAM;
3418 length = ntohs(asconf_ack_param->param_hdr.length);
3419 asconf_ack_param = (void *)asconf_ack_param + length;
3420 asconf_ack_len -= length;
3426 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3427 int sctp_process_asconf_ack(struct sctp_association *asoc,
3428 struct sctp_chunk *asconf_ack)
3430 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3431 struct sctp_addip_param *asconf_param;
3432 __be16 err_code = SCTP_ERROR_NO_ERROR;
3433 union sctp_addr_param *addr_param;
3434 int asconf_len = asconf->skb->len;
3435 int all_param_pass = 0;
3440 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3441 * a pointer to address parameter.
3443 length = sizeof(struct sctp_addip_chunk);
3444 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3445 asconf_len -= length;
3447 /* Skip the address parameter in the last asconf sent and store a
3448 * pointer to the first asconf parameter.
3450 length = ntohs(addr_param->p.length);
3451 asconf_param = (void *)addr_param + length;
3452 asconf_len -= length;
3455 * A8) If there is no response(s) to specific TLV parameter(s), and no
3456 * failures are indicated, then all request(s) are considered
3459 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3462 /* Process the TLVs contained in the last sent ASCONF chunk. */
3463 while (asconf_len > 0) {
3465 err_code = SCTP_ERROR_NO_ERROR;
3467 err_code = sctp_get_asconf_response(asconf_ack,
3470 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3475 case SCTP_ERROR_NO_ERROR:
3476 sctp_asconf_param_success(asoc, asconf_param);
3479 case SCTP_ERROR_RSRC_LOW:
3483 case SCTP_ERROR_UNKNOWN_PARAM:
3484 /* Disable sending this type of asconf parameter in
3487 asoc->peer.addip_disabled_mask |=
3488 asconf_param->param_hdr.type;
3491 case SCTP_ERROR_REQ_REFUSED:
3492 case SCTP_ERROR_DEL_LAST_IP:
3493 case SCTP_ERROR_DEL_SRC_IP:
3498 /* Skip the processed asconf parameter and move to the next
3501 length = ntohs(asconf_param->param_hdr.length);
3502 asconf_param = (void *)asconf_param + length;
3503 asconf_len -= length;
3506 if (no_err && asoc->src_out_of_asoc_ok) {
3507 asoc->src_out_of_asoc_ok = 0;
3508 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3511 /* Free the cached last sent asconf chunk. */
3512 list_del_init(&asconf->transmitted_list);
3513 sctp_chunk_free(asconf);
3514 asoc->addip_last_asconf = NULL;
3519 /* Make a FWD TSN chunk. */
3520 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3521 __u32 new_cum_tsn, size_t nstreams,
3522 struct sctp_fwdtsn_skip *skiplist)
3524 struct sctp_chunk *retval = NULL;
3525 struct sctp_fwdtsn_hdr ftsn_hdr;
3526 struct sctp_fwdtsn_skip skip;
3530 hint = (nstreams + 1) * sizeof(__u32);
3532 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3537 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3538 retval->subh.fwdtsn_hdr =
3539 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3541 for (i = 0; i < nstreams; i++) {
3542 skip.stream = skiplist[i].stream;
3543 skip.ssn = skiplist[i].ssn;
3544 sctp_addto_chunk(retval, sizeof(skip), &skip);
3550 struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
3551 __u32 new_cum_tsn, size_t nstreams,
3552 struct sctp_ifwdtsn_skip *skiplist)
3554 struct sctp_chunk *retval = NULL;
3555 struct sctp_ifwdtsn_hdr ftsn_hdr;
3558 hint = (nstreams + 1) * sizeof(__u32);
3560 retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
3565 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3566 retval->subh.ifwdtsn_hdr =
3567 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3569 sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
3574 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3576 * 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
3577 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3578 * | Type = 130 | Chunk Flags | Chunk Length |
3579 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3581 * / Re-configuration Parameter /
3583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3585 * / Re-configuration Parameter (optional) /
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3592 struct sctp_reconf_chunk *reconf;
3593 struct sctp_chunk *retval;
3595 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3600 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3601 retval->param_hdr.v = reconf->params;
3606 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3608 * 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
3609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3610 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3612 * | Re-configuration Request Sequence Number |
3613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3614 * | Re-configuration Response Sequence Number |
3615 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3616 * | Sender's Last Assigned TSN |
3617 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3618 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3619 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3621 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3622 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3623 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3625 * RE-CONFIG 4.2 (STREAM IN RESET)
3627 * 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
3628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3629 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3631 * | Re-configuration Request Sequence Number |
3632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3633 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3634 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3636 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3637 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3638 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3640 struct sctp_chunk *sctp_make_strreset_req(
3641 const struct sctp_association *asoc,
3642 __u16 stream_num, __be16 *stream_list,
3645 __u16 stream_len = stream_num * sizeof(__u16);
3646 struct sctp_strreset_outreq outreq;
3647 struct sctp_strreset_inreq inreq;
3648 struct sctp_chunk *retval;
3649 __u16 outlen, inlen;
3651 outlen = (sizeof(outreq) + stream_len) * out;
3652 inlen = (sizeof(inreq) + stream_len) * in;
3654 retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
3659 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3660 outreq.param_hdr.length = htons(outlen);
3661 outreq.request_seq = htonl(asoc->strreset_outseq);
3662 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3663 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3665 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3668 sctp_addto_chunk(retval, stream_len, stream_list);
3672 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3673 inreq.param_hdr.length = htons(inlen);
3674 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3676 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3679 sctp_addto_chunk(retval, stream_len, stream_list);
3685 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3687 * 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
3688 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3689 * | Parameter Type = 15 | Parameter Length = 8 |
3690 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3691 * | Re-configuration Request Sequence Number |
3692 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3694 struct sctp_chunk *sctp_make_strreset_tsnreq(
3695 const struct sctp_association *asoc)
3697 struct sctp_strreset_tsnreq tsnreq;
3698 __u16 length = sizeof(tsnreq);
3699 struct sctp_chunk *retval;
3701 retval = sctp_make_reconf(asoc, length);
3705 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3706 tsnreq.param_hdr.length = htons(length);
3707 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3709 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3714 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3716 * 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
3717 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3718 * | Parameter Type = 17 | Parameter Length = 12 |
3719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3720 * | Re-configuration Request Sequence Number |
3721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3722 * | Number of new streams | Reserved |
3723 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3725 struct sctp_chunk *sctp_make_strreset_addstrm(
3726 const struct sctp_association *asoc,
3727 __u16 out, __u16 in)
3729 struct sctp_strreset_addstrm addstrm;
3730 __u16 size = sizeof(addstrm);
3731 struct sctp_chunk *retval;
3733 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3738 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3739 addstrm.param_hdr.length = htons(size);
3740 addstrm.number_of_streams = htons(out);
3741 addstrm.request_seq = htonl(asoc->strreset_outseq);
3742 addstrm.reserved = 0;
3744 sctp_addto_chunk(retval, size, &addstrm);
3748 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3749 addstrm.param_hdr.length = htons(size);
3750 addstrm.number_of_streams = htons(in);
3751 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3752 addstrm.reserved = 0;
3754 sctp_addto_chunk(retval, size, &addstrm);
3760 /* RE-CONFIG 4.4 (RESP)
3762 * 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
3763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3764 * | Parameter Type = 16 | Parameter Length |
3765 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3766 * | Re-configuration Response Sequence Number |
3767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3769 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3771 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3772 __u32 result, __u32 sn)
3774 struct sctp_strreset_resp resp;
3775 __u16 length = sizeof(resp);
3776 struct sctp_chunk *retval;
3778 retval = sctp_make_reconf(asoc, length);
3782 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3783 resp.param_hdr.length = htons(length);
3784 resp.response_seq = htonl(sn);
3785 resp.result = htonl(result);
3787 sctp_addto_chunk(retval, sizeof(resp), &resp);
3792 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3794 * 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
3795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3796 * | Parameter Type = 16 | Parameter Length |
3797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3798 * | Re-configuration Response Sequence Number |
3799 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3801 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3802 * | Sender's Next TSN (optional) |
3803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3804 * | Receiver's Next TSN (optional) |
3805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3807 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3808 __u32 result, __u32 sn,
3812 struct sctp_strreset_resptsn tsnresp;
3813 __u16 length = sizeof(tsnresp);
3814 struct sctp_chunk *retval;
3816 retval = sctp_make_reconf(asoc, length);
3820 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3821 tsnresp.param_hdr.length = htons(length);
3823 tsnresp.response_seq = htonl(sn);
3824 tsnresp.result = htonl(result);
3825 tsnresp.senders_next_tsn = htonl(sender_tsn);
3826 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3828 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3833 bool sctp_verify_reconf(const struct sctp_association *asoc,
3834 struct sctp_chunk *chunk,
3835 struct sctp_paramhdr **errp)
3837 struct sctp_reconf_chunk *hdr;
3838 union sctp_params param;
3842 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3843 sctp_walk_params(param, hdr, params) {
3844 __u16 length = ntohs(param.p->length);
3849 switch (param.p->type) {
3850 case SCTP_PARAM_RESET_OUT_REQUEST:
3851 if (length < sizeof(struct sctp_strreset_outreq) ||
3852 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3853 last != SCTP_PARAM_RESET_IN_REQUEST))
3856 case SCTP_PARAM_RESET_IN_REQUEST:
3857 if (length < sizeof(struct sctp_strreset_inreq) ||
3858 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3861 case SCTP_PARAM_RESET_RESPONSE:
3862 if ((length != sizeof(struct sctp_strreset_resp) &&
3863 length != sizeof(struct sctp_strreset_resptsn)) ||
3864 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3865 last != SCTP_PARAM_RESET_OUT_REQUEST))
3868 case SCTP_PARAM_RESET_TSN_REQUEST:
3870 sizeof(struct sctp_strreset_tsnreq) || last)
3873 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3874 if (length != sizeof(struct sctp_strreset_addstrm) ||
3875 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3878 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3879 if (length != sizeof(struct sctp_strreset_addstrm) ||
3880 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3887 last = param.p->type;