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 net *net = sock_net(asoc->base.sk);
211 struct sctp_supported_ext_param ext_param;
212 struct sctp_adaptation_ind_param aiparam;
213 struct sctp_paramhdr *auth_chunks = NULL;
214 struct sctp_paramhdr *auth_hmacs = NULL;
215 struct sctp_supported_addrs_param sat;
216 struct sctp_endpoint *ep = asoc->ep;
217 struct sctp_chunk *retval = NULL;
218 int num_types, addrs_len = 0;
219 struct sctp_inithdr init;
220 union sctp_params addrs;
221 struct sctp_sock *sp;
227 /* RFC 2960 3.3.2 Initiation (INIT) (1)
229 * Note 1: The INIT chunks can contain multiple addresses that
230 * can be IPv4 and/or IPv6 in any combination.
233 /* Convert the provided bind address list to raw format. */
234 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
236 init.init_tag = htonl(asoc->c.my_vtag);
237 init.a_rwnd = htonl(asoc->rwnd);
238 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
239 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
240 init.initial_tsn = htonl(asoc->c.initial_tsn);
242 /* How many address types are needed? */
243 sp = sctp_sk(asoc->base.sk);
244 num_types = sp->pf->supported_addrs(sp, types);
246 chunksize = sizeof(init) + addrs_len;
247 chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types));
248 chunksize += sizeof(ecap_param);
250 if (asoc->ep->prsctp_enable)
251 chunksize += sizeof(prsctp_param);
253 /* ADDIP: Section 4.2.7:
254 * An implementation supporting this extension [ADDIP] MUST list
255 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
256 * INIT-ACK parameters.
258 if (net->sctp.addip_enable) {
259 extensions[num_ext] = SCTP_CID_ASCONF;
260 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
264 if (asoc->ep->reconf_enable) {
265 extensions[num_ext] = SCTP_CID_RECONF;
269 if (sp->adaptation_ind)
270 chunksize += sizeof(aiparam);
272 if (asoc->ep->intl_enable) {
273 extensions[num_ext] = SCTP_CID_I_DATA;
277 chunksize += vparam_len;
279 /* Account for AUTH related parameters */
280 if (ep->auth_enable) {
281 /* Add random parameter length*/
282 chunksize += sizeof(asoc->c.auth_random);
284 /* Add HMACS parameter length if any were defined */
285 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
286 if (auth_hmacs->length)
287 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
291 /* Add CHUNKS parameter length */
292 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
293 if (auth_chunks->length)
294 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
298 extensions[num_ext] = SCTP_CID_AUTH;
302 /* If we have any extensions to report, account for that */
304 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
306 /* RFC 2960 3.3.2 Initiation (INIT) (1)
308 * Note 3: An INIT chunk MUST NOT contain more than one Host
309 * Name address parameter. Moreover, the sender of the INIT
310 * MUST NOT combine any other address types with the Host Name
311 * address in the INIT. The receiver of INIT MUST ignore any
312 * other address types if the Host Name address parameter is
313 * present in the received INIT chunk.
315 * PLEASE DO NOT FIXME [This version does not support Host Name.]
318 retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp);
322 retval->subh.init_hdr =
323 sctp_addto_chunk(retval, sizeof(init), &init);
324 retval->param_hdr.v =
325 sctp_addto_chunk(retval, addrs_len, addrs.v);
327 /* RFC 2960 3.3.2 Initiation (INIT) (1)
329 * Note 4: This parameter, when present, specifies all the
330 * address types the sending endpoint can support. The absence
331 * of this parameter indicates that the sending endpoint can
332 * support any address type.
334 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
335 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
336 sctp_addto_chunk(retval, sizeof(sat), &sat);
337 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
339 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
341 /* Add the supported extensions parameter. Be nice and add this
342 * fist before addiding the parameters for the extensions themselves
345 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
346 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
347 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
348 sctp_addto_param(retval, num_ext, extensions);
351 if (asoc->ep->prsctp_enable)
352 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
354 if (sp->adaptation_ind) {
355 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
356 aiparam.param_hdr.length = htons(sizeof(aiparam));
357 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
358 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
361 /* Add SCTP-AUTH chunks to the parameter list */
362 if (ep->auth_enable) {
363 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
364 asoc->c.auth_random);
366 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
369 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
377 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
378 const struct sctp_chunk *chunk,
379 gfp_t gfp, int unkparam_len)
381 struct sctp_supported_ext_param ext_param;
382 struct sctp_adaptation_ind_param aiparam;
383 struct sctp_paramhdr *auth_chunks = NULL;
384 struct sctp_paramhdr *auth_random = NULL;
385 struct sctp_paramhdr *auth_hmacs = NULL;
386 struct sctp_chunk *retval = NULL;
387 struct sctp_cookie_param *cookie;
388 struct sctp_inithdr initack;
389 union sctp_params addrs;
390 struct sctp_sock *sp;
397 /* Note: there may be no addresses to embed. */
398 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
400 initack.init_tag = htonl(asoc->c.my_vtag);
401 initack.a_rwnd = htonl(asoc->rwnd);
402 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
403 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
404 initack.initial_tsn = htonl(asoc->c.initial_tsn);
406 /* FIXME: We really ought to build the cookie right
407 * into the packet instead of allocating more fresh memory.
409 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
414 /* Calculate the total size of allocation, include the reserved
415 * space for reporting unknown parameters if it is specified.
417 sp = sctp_sk(asoc->base.sk);
418 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
420 /* Tell peer that we'll do ECN only if peer advertised such cap. */
421 if (asoc->peer.ecn_capable)
422 chunksize += sizeof(ecap_param);
424 if (asoc->peer.prsctp_capable)
425 chunksize += sizeof(prsctp_param);
427 if (asoc->peer.asconf_capable) {
428 extensions[num_ext] = SCTP_CID_ASCONF;
429 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
433 if (asoc->peer.reconf_capable) {
434 extensions[num_ext] = SCTP_CID_RECONF;
438 if (sp->adaptation_ind)
439 chunksize += sizeof(aiparam);
441 if (asoc->peer.intl_capable) {
442 extensions[num_ext] = SCTP_CID_I_DATA;
446 if (asoc->peer.auth_capable) {
447 auth_random = (struct sctp_paramhdr *)asoc->c.auth_random;
448 chunksize += ntohs(auth_random->length);
450 auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs;
451 if (auth_hmacs->length)
452 chunksize += SCTP_PAD4(ntohs(auth_hmacs->length));
456 auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks;
457 if (auth_chunks->length)
458 chunksize += SCTP_PAD4(ntohs(auth_chunks->length));
462 extensions[num_ext] = SCTP_CID_AUTH;
467 chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext);
469 /* Now allocate and fill out the chunk. */
470 retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp);
474 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
476 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
477 * HEARTBEAT ACK, * etc.) to the same destination transport
478 * address from which it received the DATA or control chunk
479 * to which it is replying.
481 * [INIT ACK back to where the INIT came from.]
483 if (chunk->transport)
485 sctp_assoc_lookup_paddr(asoc,
486 &chunk->transport->ipaddr);
488 retval->subh.init_hdr =
489 sctp_addto_chunk(retval, sizeof(initack), &initack);
490 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
491 sctp_addto_chunk(retval, cookie_len, cookie);
492 if (asoc->peer.ecn_capable)
493 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
495 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
496 ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext);
497 sctp_addto_chunk(retval, sizeof(ext_param), &ext_param);
498 sctp_addto_param(retval, num_ext, extensions);
500 if (asoc->peer.prsctp_capable)
501 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
503 if (sp->adaptation_ind) {
504 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
505 aiparam.param_hdr.length = htons(sizeof(aiparam));
506 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
507 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
510 if (asoc->peer.auth_capable) {
511 sctp_addto_chunk(retval, ntohs(auth_random->length),
514 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
517 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
521 /* We need to remove the const qualifier at this point. */
522 retval->asoc = (struct sctp_association *) asoc;
531 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
533 * This chunk is used only during the initialization of an association.
534 * It is sent by the initiator of an association to its peer to complete
535 * the initialization process. This chunk MUST precede any DATA chunk
536 * sent within the association, but MAY be bundled with one or more DATA
537 * chunks in the same packet.
540 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * | Type = 10 |Chunk Flags | Length |
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * Set to zero on transmit and ignored on receipt.
552 * Length: 16 bits (unsigned integer)
554 * Set to the size of the chunk in bytes, including the 4 bytes of
555 * the chunk header and the size of the Cookie.
557 * Cookie: variable size
559 * This field must contain the exact cookie received in the
560 * State Cookie parameter from the previous INIT ACK.
562 * An implementation SHOULD make the cookie as small as possible
563 * to insure interoperability.
565 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
566 const struct sctp_chunk *chunk)
568 struct sctp_chunk *retval;
572 cookie = asoc->peer.cookie;
573 cookie_len = asoc->peer.cookie_len;
575 /* Build a cookie echo chunk. */
576 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0,
577 cookie_len, GFP_ATOMIC);
580 retval->subh.cookie_hdr =
581 sctp_addto_chunk(retval, cookie_len, cookie);
583 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
585 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
586 * HEARTBEAT ACK, * etc.) to the same destination transport
587 * address from which it * received the DATA or control chunk
588 * to which it is replying.
590 * [COOKIE ECHO back to where the INIT ACK came from.]
593 retval->transport = chunk->transport;
599 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
601 * This chunk is used only during the initialization of an
602 * association. It is used to acknowledge the receipt of a COOKIE
603 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
604 * within the association, but MAY be bundled with one or more DATA
605 * chunks or SACK chunk in the same SCTP packet.
608 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
610 * | Type = 11 |Chunk Flags | Length = 4 |
611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
613 * Chunk Flags: 8 bits
615 * Set to zero on transmit and ignored on receipt.
617 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
618 const struct sctp_chunk *chunk)
620 struct sctp_chunk *retval;
622 retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC);
624 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
626 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
627 * HEARTBEAT ACK, * etc.) to the same destination transport
628 * address from which it * received the DATA or control chunk
629 * to which it is replying.
631 * [COOKIE ACK back to where the COOKIE ECHO came from.]
633 if (retval && chunk && chunk->transport)
635 sctp_assoc_lookup_paddr(asoc,
636 &chunk->transport->ipaddr);
642 * Appendix A: Explicit Congestion Notification:
645 * RFC 2481 details a specific bit for a sender to send in the header of
646 * its next outbound TCP segment to indicate to its peer that it has
647 * reduced its congestion window. This is termed the CWR bit. For
648 * SCTP the same indication is made by including the CWR chunk.
649 * This chunk contains one data element, i.e. the TSN number that
650 * was sent in the ECNE chunk. This element represents the lowest
651 * TSN number in the datagram that was originally marked with the
655 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
656 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
657 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Lowest TSN Number |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
662 * Note: The CWR is considered a Control chunk.
664 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
665 const __u32 lowest_tsn,
666 const struct sctp_chunk *chunk)
668 struct sctp_chunk *retval;
669 struct sctp_cwrhdr cwr;
671 cwr.lowest_tsn = htonl(lowest_tsn);
672 retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0,
673 sizeof(cwr), GFP_ATOMIC);
678 retval->subh.ecn_cwr_hdr =
679 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
681 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
683 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
684 * HEARTBEAT ACK, * etc.) to the same destination transport
685 * address from which it * received the DATA or control chunk
686 * to which it is replying.
688 * [Report a reduced congestion window back to where the ECNE
692 retval->transport = chunk->transport;
698 /* Make an ECNE chunk. This is a congestion experienced report. */
699 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
700 const __u32 lowest_tsn)
702 struct sctp_chunk *retval;
703 struct sctp_ecnehdr ecne;
705 ecne.lowest_tsn = htonl(lowest_tsn);
706 retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0,
707 sizeof(ecne), GFP_ATOMIC);
710 retval->subh.ecne_hdr =
711 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
717 /* Make a DATA chunk for the given association from the provided
718 * parameters. However, do not populate the data payload.
720 struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
721 const struct sctp_sndrcvinfo *sinfo,
722 int len, __u8 flags, gfp_t gfp)
724 struct sctp_chunk *retval;
725 struct sctp_datahdr dp;
727 /* We assign the TSN as LATE as possible, not here when
728 * creating the chunk.
730 memset(&dp, 0, sizeof(dp));
731 dp.ppid = sinfo->sinfo_ppid;
732 dp.stream = htons(sinfo->sinfo_stream);
734 /* Set the flags for an unordered send. */
735 if (sinfo->sinfo_flags & SCTP_UNORDERED)
736 flags |= SCTP_DATA_UNORDERED;
738 retval = sctp_make_data(asoc, flags, sizeof(dp) + len, gfp);
742 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
743 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
748 /* Create a selective ackowledgement (SACK) for the given
749 * association. This reports on which TSN's we've seen to date,
750 * including duplicates and gaps.
752 struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc)
754 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
755 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
756 __u16 num_gabs, num_dup_tsns;
757 struct sctp_transport *trans;
758 struct sctp_chunk *retval;
759 struct sctp_sackhdr sack;
763 memset(gabs, 0, sizeof(gabs));
764 ctsn = sctp_tsnmap_get_ctsn(map);
766 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
768 /* How much room is needed in the chunk? */
769 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
770 num_dup_tsns = sctp_tsnmap_num_dups(map);
772 /* Initialize the SACK header. */
773 sack.cum_tsn_ack = htonl(ctsn);
774 sack.a_rwnd = htonl(asoc->a_rwnd);
775 sack.num_gap_ack_blocks = htons(num_gabs);
776 sack.num_dup_tsns = htons(num_dup_tsns);
779 + sizeof(struct sctp_gap_ack_block) * num_gabs
780 + sizeof(__u32) * num_dup_tsns;
782 /* Create the chunk. */
783 retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC);
787 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
789 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
790 * HEARTBEAT ACK, etc.) to the same destination transport
791 * address from which it received the DATA or control chunk to
792 * which it is replying. This rule should also be followed if
793 * the endpoint is bundling DATA chunks together with the
796 * However, when acknowledging multiple DATA chunks received
797 * in packets from different source addresses in a single
798 * SACK, the SACK chunk may be transmitted to one of the
799 * destination transport addresses from which the DATA or
800 * control chunks being acknowledged were received.
802 * [BUG: We do not implement the following paragraph.
803 * Perhaps we should remember the last transport we used for a
804 * SACK and avoid that (if possible) if we have seen any
805 * duplicates. --piggy]
807 * When a receiver of a duplicate DATA chunk sends a SACK to a
808 * multi- homed endpoint it MAY be beneficial to vary the
809 * destination address and not use the source address of the
810 * DATA chunk. The reason being that receiving a duplicate
811 * from a multi-homed endpoint might indicate that the return
812 * path (as specified in the source address of the DATA chunk)
813 * for the SACK is broken.
815 * [Send to the address from which we last received a DATA chunk.]
817 retval->transport = asoc->peer.last_data_from;
819 retval->subh.sack_hdr =
820 sctp_addto_chunk(retval, sizeof(sack), &sack);
822 /* Add the gap ack block information. */
824 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
827 /* Add the duplicate TSN information. */
829 asoc->stats.idupchunks += num_dup_tsns;
830 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
831 sctp_tsnmap_get_dups(map));
833 /* Once we have a sack generated, check to see what our sack
834 * generation is, if its 0, reset the transports to 0, and reset
835 * the association generation to 1
837 * The idea is that zero is never used as a valid generation for the
838 * association so no transport will match after a wrap event like this,
839 * Until the next sack
841 if (++asoc->peer.sack_generation == 0) {
842 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
844 trans->sack_generation = 0;
845 asoc->peer.sack_generation = 1;
851 /* Make a SHUTDOWN chunk. */
852 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
853 const struct sctp_chunk *chunk)
855 struct sctp_shutdownhdr shut;
856 struct sctp_chunk *retval;
859 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
860 shut.cum_tsn_ack = htonl(ctsn);
862 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,
863 sizeof(shut), GFP_ATOMIC);
867 retval->subh.shutdown_hdr =
868 sctp_addto_chunk(retval, sizeof(shut), &shut);
871 retval->transport = chunk->transport;
876 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
877 const struct sctp_chunk *chunk)
879 struct sctp_chunk *retval;
881 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0,
884 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
886 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
887 * HEARTBEAT ACK, * etc.) to the same destination transport
888 * address from which it * received the DATA or control chunk
889 * to which it is replying.
891 * [ACK back to where the SHUTDOWN came from.]
894 retval->transport = chunk->transport;
899 struct sctp_chunk *sctp_make_shutdown_complete(
900 const struct sctp_association *asoc,
901 const struct sctp_chunk *chunk)
903 struct sctp_chunk *retval;
906 /* Set the T-bit if we have no association (vtag will be
909 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
911 retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags,
914 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
916 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
917 * HEARTBEAT ACK, * etc.) to the same destination transport
918 * address from which it * received the DATA or control chunk
919 * to which it is replying.
921 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
925 retval->transport = chunk->transport;
930 /* Create an ABORT. Note that we set the T bit if we have no
931 * association, except when responding to an INIT (sctpimpguide 2.41).
933 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
934 const struct sctp_chunk *chunk,
937 struct sctp_chunk *retval;
940 /* Set the T-bit if we have no association and 'chunk' is not
941 * an INIT (vtag will be reflected).
944 if (chunk && chunk->chunk_hdr &&
945 chunk->chunk_hdr->type == SCTP_CID_INIT)
948 flags = SCTP_CHUNK_FLAG_T;
951 retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint,
954 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
956 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
957 * HEARTBEAT ACK, * etc.) to the same destination transport
958 * address from which it * received the DATA or control chunk
959 * to which it is replying.
961 * [ABORT back to where the offender came from.]
964 retval->transport = chunk->transport;
969 /* Helper to create ABORT with a NO_USER_DATA error. */
970 struct sctp_chunk *sctp_make_abort_no_data(
971 const struct sctp_association *asoc,
972 const struct sctp_chunk *chunk,
975 struct sctp_chunk *retval;
978 retval = sctp_make_abort(asoc, chunk,
979 sizeof(struct sctp_errhdr) + sizeof(tsn));
984 /* Put the tsn back into network byte order. */
985 payload = htonl(tsn);
986 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
987 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
989 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
991 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
992 * HEARTBEAT ACK, * etc.) to the same destination transport
993 * address from which it * received the DATA or control chunk
994 * to which it is replying.
996 * [ABORT back to where the offender came from.]
999 retval->transport = chunk->transport;
1005 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1006 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
1010 struct sctp_chunk *retval;
1011 void *payload = NULL;
1014 retval = sctp_make_abort(asoc, NULL,
1015 sizeof(struct sctp_errhdr) + paylen);
1020 /* Put the msg_iov together into payload. */
1021 payload = kmalloc(paylen, GFP_KERNEL);
1025 err = memcpy_from_msg(payload, msg, paylen);
1030 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
1031 sctp_addto_chunk(retval, paylen, payload);
1041 sctp_chunk_free(retval);
1047 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1050 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1053 int chunklen = ntohs(chunk->chunk_hdr->length);
1056 target = skb_put(chunk->skb, len);
1059 memcpy(target, data, len);
1061 memset(target, 0, len);
1063 /* Adjust the chunk length field. */
1064 chunk->chunk_hdr->length = htons(chunklen + len);
1065 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1070 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1071 struct sctp_chunk *sctp_make_abort_violation(
1072 const struct sctp_association *asoc,
1073 const struct sctp_chunk *chunk,
1074 const __u8 *payload,
1075 const size_t paylen)
1077 struct sctp_chunk *retval;
1078 struct sctp_paramhdr phdr;
1080 retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) +
1081 paylen + sizeof(phdr));
1085 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen +
1088 phdr.type = htons(chunk->chunk_hdr->type);
1089 phdr.length = chunk->chunk_hdr->length;
1090 sctp_addto_chunk(retval, paylen, payload);
1091 sctp_addto_param(retval, sizeof(phdr), &phdr);
1097 struct sctp_chunk *sctp_make_violation_paramlen(
1098 const struct sctp_association *asoc,
1099 const struct sctp_chunk *chunk,
1100 struct sctp_paramhdr *param)
1102 static const char error[] = "The following parameter had invalid length:";
1103 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) +
1105 struct sctp_chunk *retval;
1107 retval = sctp_make_abort(asoc, chunk, payload_len);
1111 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1112 sizeof(error) + sizeof(*param));
1113 sctp_addto_chunk(retval, sizeof(error), error);
1114 sctp_addto_param(retval, sizeof(*param), param);
1120 struct sctp_chunk *sctp_make_violation_max_retrans(
1121 const struct sctp_association *asoc,
1122 const struct sctp_chunk *chunk)
1124 static const char error[] = "Association exceeded its max_retrans count";
1125 size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr);
1126 struct sctp_chunk *retval;
1128 retval = sctp_make_abort(asoc, chunk, payload_len);
1132 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error));
1133 sctp_addto_chunk(retval, sizeof(error), error);
1139 /* Make a HEARTBEAT chunk. */
1140 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1141 const struct sctp_transport *transport)
1143 struct sctp_sender_hb_info hbinfo;
1144 struct sctp_chunk *retval;
1146 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,
1147 sizeof(hbinfo), GFP_ATOMIC);
1152 hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO;
1153 hbinfo.param_hdr.length = htons(sizeof(hbinfo));
1154 hbinfo.daddr = transport->ipaddr;
1155 hbinfo.sent_at = jiffies;
1156 hbinfo.hb_nonce = transport->hb_nonce;
1158 /* Cast away the 'const', as this is just telling the chunk
1159 * what transport it belongs to.
1161 retval->transport = (struct sctp_transport *) transport;
1162 retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo),
1169 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1170 const struct sctp_chunk *chunk,
1171 const void *payload,
1172 const size_t paylen)
1174 struct sctp_chunk *retval;
1176 retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen,
1181 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1183 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1185 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1186 * HEARTBEAT ACK, * etc.) to the same destination transport
1187 * address from which it * received the DATA or control chunk
1188 * to which it is replying.
1190 * [HBACK back to where the HEARTBEAT came from.]
1193 retval->transport = chunk->transport;
1199 /* Create an Operation Error chunk with the specified space reserved.
1200 * This routine can be used for containing multiple causes in the chunk.
1202 static struct sctp_chunk *sctp_make_op_error_space(
1203 const struct sctp_association *asoc,
1204 const struct sctp_chunk *chunk,
1207 struct sctp_chunk *retval;
1209 retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0,
1210 sizeof(struct sctp_errhdr) + size,
1215 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1217 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1218 * HEARTBEAT ACK, etc.) to the same destination transport
1219 * address from which it received the DATA or control chunk
1220 * to which it is replying.
1224 retval->transport = chunk->transport;
1230 /* Create an Operation Error chunk of a fixed size, specifically,
1231 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1232 * This is a helper function to allocate an error chunk for for those
1233 * invalid parameter codes in which we may not want to report all the
1234 * errors, if the incoming chunk is large. If it can't fit in a single
1235 * packet, we ignore it.
1237 static inline struct sctp_chunk *sctp_make_op_error_limited(
1238 const struct sctp_association *asoc,
1239 const struct sctp_chunk *chunk)
1241 size_t size = SCTP_DEFAULT_MAXSEGMENT;
1242 struct sctp_sock *sp = NULL;
1245 size = min_t(size_t, size, asoc->pathmtu);
1246 sp = sctp_sk(asoc->base.sk);
1249 size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
1251 return sctp_make_op_error_space(asoc, chunk, size);
1254 /* Create an Operation Error chunk. */
1255 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1256 const struct sctp_chunk *chunk,
1257 __be16 cause_code, const void *payload,
1258 size_t paylen, size_t reserve_tail)
1260 struct sctp_chunk *retval;
1262 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1266 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1267 sctp_addto_chunk(retval, paylen, payload);
1269 sctp_addto_param(retval, reserve_tail, NULL);
1275 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc,
1278 struct sctp_authhdr auth_hdr;
1279 struct sctp_hmac *hmac_desc;
1280 struct sctp_chunk *retval;
1282 /* Get the first hmac that the peer told us to use */
1283 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1284 if (unlikely(!hmac_desc))
1287 retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0,
1288 hmac_desc->hmac_len + sizeof(auth_hdr),
1293 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1294 auth_hdr.shkey_id = htons(key_id);
1296 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr),
1299 skb_put_zero(retval->skb, hmac_desc->hmac_len);
1301 /* Adjust the chunk header to include the empty MAC */
1302 retval->chunk_hdr->length =
1303 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1304 retval->chunk_end = skb_tail_pointer(retval->skb);
1310 /********************************************************************
1311 * 2nd Level Abstractions
1312 ********************************************************************/
1314 /* Turn an skb into a chunk.
1315 * FIXME: Eventually move the structure directly inside the skb->cb[].
1317 * sctpimpguide-05.txt Section 2.8.2
1318 * M1) Each time a new DATA chunk is transmitted
1319 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1320 * 'TSN.Missing.Report' count will be used to determine missing chunks
1321 * and when to fast retransmit.
1324 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1325 const struct sctp_association *asoc,
1326 struct sock *sk, gfp_t gfp)
1328 struct sctp_chunk *retval;
1330 retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp);
1335 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
1337 INIT_LIST_HEAD(&retval->list);
1339 retval->asoc = (struct sctp_association *)asoc;
1340 retval->singleton = 1;
1342 retval->fast_retransmit = SCTP_CAN_FRTX;
1344 /* Polish the bead hole. */
1345 INIT_LIST_HEAD(&retval->transmitted_list);
1346 INIT_LIST_HEAD(&retval->frag_list);
1347 SCTP_DBG_OBJCNT_INC(chunk);
1348 refcount_set(&retval->refcnt, 1);
1354 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1355 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1356 union sctp_addr *dest)
1358 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1359 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1362 /* Extract the source address from a chunk. */
1363 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1365 /* If we have a known transport, use that. */
1366 if (chunk->transport) {
1367 return &chunk->transport->ipaddr;
1369 /* Otherwise, extract it from the IP header. */
1370 return &chunk->source;
1374 /* Create a new chunk, setting the type and flags headers from the
1375 * arguments, reserving enough space for a 'paylen' byte payload.
1377 static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc,
1378 __u8 type, __u8 flags, int paylen,
1381 struct sctp_chunkhdr *chunk_hdr;
1382 struct sctp_chunk *retval;
1383 struct sk_buff *skb;
1387 chunklen = SCTP_PAD4(sizeof(*chunk_hdr) + paylen);
1388 if (chunklen > SCTP_MAX_CHUNK_LEN)
1391 /* No need to allocate LL here, as this is only a chunk. */
1392 skb = alloc_skb(chunklen, gfp);
1396 /* Make room for the chunk header. */
1397 chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr));
1398 chunk_hdr->type = type;
1399 chunk_hdr->flags = flags;
1400 chunk_hdr->length = htons(sizeof(*chunk_hdr));
1402 sk = asoc ? asoc->base.sk : NULL;
1403 retval = sctp_chunkify(skb, asoc, sk, gfp);
1409 retval->chunk_hdr = chunk_hdr;
1410 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr);
1412 /* Determine if the chunk needs to be authenticated */
1413 if (sctp_auth_send_cid(type, asoc))
1421 static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc,
1422 __u8 flags, int paylen, gfp_t gfp)
1424 return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp);
1427 struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
1428 __u8 flags, int paylen, gfp_t gfp)
1430 return _sctp_make_chunk(asoc, SCTP_CID_I_DATA, flags, paylen, gfp);
1433 static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc,
1434 __u8 type, __u8 flags, int paylen,
1437 struct sctp_chunk *chunk;
1439 chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp);
1441 sctp_control_set_owner_w(chunk);
1446 /* Release the memory occupied by a chunk. */
1447 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1449 BUG_ON(!list_empty(&chunk->list));
1450 list_del_init(&chunk->transmitted_list);
1452 consume_skb(chunk->skb);
1453 consume_skb(chunk->auth_chunk);
1455 SCTP_DBG_OBJCNT_DEC(chunk);
1456 kmem_cache_free(sctp_chunk_cachep, chunk);
1459 /* Possibly, free the chunk. */
1460 void sctp_chunk_free(struct sctp_chunk *chunk)
1462 /* Release our reference on the message tracker. */
1464 sctp_datamsg_put(chunk->msg);
1466 sctp_chunk_put(chunk);
1469 /* Grab a reference to the chunk. */
1470 void sctp_chunk_hold(struct sctp_chunk *ch)
1472 refcount_inc(&ch->refcnt);
1475 /* Release a reference to the chunk. */
1476 void sctp_chunk_put(struct sctp_chunk *ch)
1478 if (refcount_dec_and_test(&ch->refcnt))
1479 sctp_chunk_destroy(ch);
1482 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1485 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1487 int chunklen = ntohs(chunk->chunk_hdr->length);
1488 int padlen = SCTP_PAD4(chunklen) - chunklen;
1491 skb_put_zero(chunk->skb, padlen);
1492 target = skb_put_data(chunk->skb, data, len);
1494 /* Adjust the chunk length field. */
1495 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1496 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1501 /* Append bytes from user space to the end of a chunk. Will panic if
1502 * chunk is not big enough.
1503 * Returns a kernel err value.
1505 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
1506 struct iov_iter *from)
1510 /* Make room in chunk for data. */
1511 target = skb_put(chunk->skb, len);
1513 /* Copy data (whole iovec) into chunk */
1514 if (!copy_from_iter_full(target, len, from))
1517 /* Adjust the chunk length field. */
1518 chunk->chunk_hdr->length =
1519 htons(ntohs(chunk->chunk_hdr->length) + len);
1520 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1525 /* Helper function to assign a TSN if needed. This assumes that both
1526 * the data_hdr and association have already been assigned.
1528 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1530 struct sctp_stream *stream;
1531 struct sctp_chunk *lchunk;
1532 struct sctp_datamsg *msg;
1538 /* All fragments will be on the same stream */
1539 sid = ntohs(chunk->subh.data_hdr->stream);
1540 stream = &chunk->asoc->stream;
1542 /* Now assign the sequence number to the entire message.
1543 * All fragments must have the same stream sequence number.
1546 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1547 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1550 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1551 ssn = sctp_ssn_next(stream, out, sid);
1553 ssn = sctp_ssn_peek(stream, out, sid);
1556 lchunk->subh.data_hdr->ssn = htons(ssn);
1557 lchunk->has_ssn = 1;
1561 /* Helper function to assign a TSN if needed. This assumes that both
1562 * the data_hdr and association have already been assigned.
1564 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1566 if (!chunk->has_tsn) {
1567 /* This is the last possible instant to
1570 chunk->subh.data_hdr->tsn =
1571 htonl(sctp_association_get_next_tsn(chunk->asoc));
1576 /* Create a CLOSED association to use with an incoming packet. */
1577 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1578 struct sctp_chunk *chunk,
1581 struct sctp_association *asoc;
1582 enum sctp_scope scope;
1583 struct sk_buff *skb;
1585 /* Create the bare association. */
1586 scope = sctp_scope(sctp_source(chunk));
1587 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1592 /* Create an entry for the source address of the packet. */
1593 SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1);
1599 /* Build a cookie representing asoc.
1600 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1602 static struct sctp_cookie_param *sctp_pack_cookie(
1603 const struct sctp_endpoint *ep,
1604 const struct sctp_association *asoc,
1605 const struct sctp_chunk *init_chunk,
1606 int *cookie_len, const __u8 *raw_addrs,
1609 struct sctp_signed_cookie *cookie;
1610 struct sctp_cookie_param *retval;
1611 int headersize, bodysize;
1613 /* Header size is static data prior to the actual cookie, including
1616 headersize = sizeof(struct sctp_paramhdr) +
1617 (sizeof(struct sctp_signed_cookie) -
1618 sizeof(struct sctp_cookie));
1619 bodysize = sizeof(struct sctp_cookie)
1620 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1622 /* Pad out the cookie to a multiple to make the signature
1623 * functions simpler to write.
1625 if (bodysize % SCTP_COOKIE_MULTIPLE)
1626 bodysize += SCTP_COOKIE_MULTIPLE
1627 - (bodysize % SCTP_COOKIE_MULTIPLE);
1628 *cookie_len = headersize + bodysize;
1630 /* Clear this memory since we are sending this data structure
1631 * out on the network.
1633 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1637 cookie = (struct sctp_signed_cookie *) retval->body;
1639 /* Set up the parameter header. */
1640 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1641 retval->p.length = htons(*cookie_len);
1643 /* Copy the cookie part of the association itself. */
1644 cookie->c = asoc->c;
1645 /* Save the raw address list length in the cookie. */
1646 cookie->c.raw_addr_list_len = addrs_len;
1648 /* Remember PR-SCTP capability. */
1649 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1651 /* Save adaptation indication in the cookie. */
1652 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1654 /* Set an expiration time for the cookie. */
1655 cookie->c.expiration = ktime_add(asoc->cookie_life,
1658 /* Copy the peer's init packet. */
1659 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1660 ntohs(init_chunk->chunk_hdr->length));
1662 /* Copy the raw local address list of the association. */
1663 memcpy((__u8 *)&cookie->c.peer_init[0] +
1664 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1666 if (sctp_sk(ep->base.sk)->hmac) {
1667 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1670 /* Sign the message. */
1671 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1673 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1674 sizeof(ep->secret_key)) ?:
1675 crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
1677 shash_desc_zero(desc);
1691 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1692 struct sctp_association *sctp_unpack_cookie(
1693 const struct sctp_endpoint *ep,
1694 const struct sctp_association *asoc,
1695 struct sctp_chunk *chunk, gfp_t gfp,
1696 int *error, struct sctp_chunk **errp)
1698 struct sctp_association *retval = NULL;
1699 int headersize, bodysize, fixed_size;
1700 struct sctp_signed_cookie *cookie;
1701 struct sk_buff *skb = chunk->skb;
1702 struct sctp_cookie *bear_cookie;
1703 __u8 *digest = ep->digest;
1704 enum sctp_scope scope;
1708 /* Header size is static data prior to the actual cookie, including
1711 headersize = sizeof(struct sctp_chunkhdr) +
1712 (sizeof(struct sctp_signed_cookie) -
1713 sizeof(struct sctp_cookie));
1714 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1715 fixed_size = headersize + sizeof(struct sctp_cookie);
1717 /* Verify that the chunk looks like it even has a cookie.
1718 * There must be enough room for our cookie and our peer's
1721 len = ntohs(chunk->chunk_hdr->length);
1722 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1725 /* Verify that the cookie has been padded out. */
1726 if (bodysize % SCTP_COOKIE_MULTIPLE)
1729 /* Process the cookie. */
1730 cookie = chunk->subh.cookie_hdr;
1731 bear_cookie = &cookie->c;
1733 if (!sctp_sk(ep->base.sk)->hmac)
1736 /* Check the signature. */
1738 SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
1741 desc->tfm = sctp_sk(ep->base.sk)->hmac;
1743 err = crypto_shash_setkey(desc->tfm, ep->secret_key,
1744 sizeof(ep->secret_key)) ?:
1745 crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
1747 shash_desc_zero(desc);
1750 *error = -SCTP_IERROR_NOMEM;
1755 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1756 *error = -SCTP_IERROR_BAD_SIG;
1761 /* IG Section 2.35.2:
1762 * 3) Compare the port numbers and the verification tag contained
1763 * within the COOKIE ECHO chunk to the actual port numbers and the
1764 * verification tag within the SCTP common header of the received
1765 * packet. If these values do not match the packet MUST be silently
1768 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1769 *error = -SCTP_IERROR_BAD_TAG;
1773 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1774 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1775 *error = -SCTP_IERROR_BAD_PORTS;
1779 /* Check to see if the cookie is stale. If there is already
1780 * an association, there is no need to check cookie's expiration
1781 * for init collision case of lost COOKIE ACK.
1782 * If skb has been timestamped, then use the stamp, otherwise
1783 * use current time. This introduces a small possibility that
1784 * that a cookie may be considered expired, but his would only slow
1785 * down the new association establishment instead of every packet.
1787 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1788 kt = skb_get_ktime(skb);
1790 kt = ktime_get_real();
1792 if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
1793 suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
1794 __be32 n = htonl(usecs);
1797 * Section 3.3.10.3 Stale Cookie Error (3)
1801 * Stale Cookie Error: Indicates the receipt of a valid State
1802 * Cookie that has expired.
1804 *errp = sctp_make_op_error(asoc, chunk,
1805 SCTP_ERROR_STALE_COOKIE, &n,
1808 *error = -SCTP_IERROR_STALE_COOKIE;
1810 *error = -SCTP_IERROR_NOMEM;
1815 /* Make a new base association. */
1816 scope = sctp_scope(sctp_source(chunk));
1817 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1819 *error = -SCTP_IERROR_NOMEM;
1823 /* Set up our peer's port number. */
1824 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1826 /* Populate the association from the cookie. */
1827 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1829 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1831 *error = -SCTP_IERROR_NOMEM;
1835 /* Also, add the destination address. */
1836 if (list_empty(&retval->base.bind_addr.address_list)) {
1837 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1838 sizeof(chunk->dest), SCTP_ADDR_SRC,
1842 retval->next_tsn = retval->c.initial_tsn;
1843 retval->ctsn_ack_point = retval->next_tsn - 1;
1844 retval->addip_serial = retval->c.initial_tsn;
1845 retval->strreset_outseq = retval->c.initial_tsn;
1846 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1847 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1848 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1850 /* The INIT stuff will be done by the side effects. */
1855 sctp_association_free(retval);
1860 /* Yikes! The packet is either corrupt or deliberately
1863 *error = -SCTP_IERROR_MALFORMED;
1867 /********************************************************************
1868 * 3rd Level Abstractions
1869 ********************************************************************/
1871 struct __sctp_missing {
1877 * Report a missing mandatory parameter.
1879 static int sctp_process_missing_param(const struct sctp_association *asoc,
1880 enum sctp_param paramtype,
1881 struct sctp_chunk *chunk,
1882 struct sctp_chunk **errp)
1884 struct __sctp_missing report;
1887 len = SCTP_PAD4(sizeof(report));
1889 /* Make an ERROR chunk, preparing enough room for
1890 * returning multiple unknown parameters.
1893 *errp = sctp_make_op_error_space(asoc, chunk, len);
1896 report.num_missing = htonl(1);
1897 report.type = paramtype;
1898 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1900 sctp_addto_chunk(*errp, sizeof(report), &report);
1903 /* Stop processing this chunk. */
1907 /* Report an Invalid Mandatory Parameter. */
1908 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1909 struct sctp_chunk *chunk,
1910 struct sctp_chunk **errp)
1912 /* Invalid Mandatory Parameter Error has no payload. */
1915 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1918 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1920 /* Stop processing this chunk. */
1924 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1925 struct sctp_paramhdr *param,
1926 const struct sctp_chunk *chunk,
1927 struct sctp_chunk **errp)
1929 /* This is a fatal error. Any accumulated non-fatal errors are
1933 sctp_chunk_free(*errp);
1935 /* Create an error chunk and fill it in with our payload. */
1936 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1942 /* Do not attempt to handle the HOST_NAME parm. However, do
1943 * send back an indicator to the peer.
1945 static int sctp_process_hn_param(const struct sctp_association *asoc,
1946 union sctp_params param,
1947 struct sctp_chunk *chunk,
1948 struct sctp_chunk **errp)
1950 __u16 len = ntohs(param.p->length);
1952 /* Processing of the HOST_NAME parameter will generate an
1953 * ABORT. If we've accumulated any non-fatal errors, they
1954 * would be unrecognized parameters and we should not include
1955 * them in the ABORT.
1958 sctp_chunk_free(*errp);
1960 *errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
1963 /* Stop processing this chunk. */
1967 static int sctp_verify_ext_param(struct net *net, union sctp_params param)
1969 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
1970 int have_asconf = 0;
1974 for (i = 0; i < num_ext; i++) {
1975 switch (param.ext->chunks[i]) {
1979 case SCTP_CID_ASCONF:
1980 case SCTP_CID_ASCONF_ACK:
1986 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1987 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1988 * only if ADD-IP is turned on and we are not backward-compatible
1991 if (net->sctp.addip_noauth)
1994 if (net->sctp.addip_enable && !have_auth && have_asconf)
2000 static void sctp_process_ext_param(struct sctp_association *asoc,
2001 union sctp_params param)
2003 __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2004 struct net *net = sock_net(asoc->base.sk);
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 (net->sctp.addip_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, param))
2149 return SCTP_IERROR_ABORT;
2152 case SCTP_PARAM_SET_PRIMARY:
2153 if (net->sctp.addip_enable)
2157 case SCTP_PARAM_HOST_NAME_ADDRESS:
2158 /* Tell the peer, we won't support this param. */
2159 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2160 retval = SCTP_IERROR_ABORT;
2163 case SCTP_PARAM_FWD_TSN_SUPPORT:
2164 if (ep->prsctp_enable)
2168 case SCTP_PARAM_RANDOM:
2169 if (!ep->auth_enable)
2172 /* SCTP-AUTH: Secion 6.1
2173 * If the random number is not 32 byte long the association
2174 * MUST be aborted. The ABORT chunk SHOULD contain the error
2175 * cause 'Protocol Violation'.
2177 if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
2178 sizeof(struct sctp_paramhdr)) {
2179 sctp_process_inv_paramlength(asoc, param.p,
2181 retval = SCTP_IERROR_ABORT;
2185 case SCTP_PARAM_CHUNKS:
2186 if (!ep->auth_enable)
2189 /* SCTP-AUTH: Section 3.2
2190 * The CHUNKS parameter MUST be included once in the INIT or
2191 * INIT-ACK chunk if the sender wants to receive authenticated
2192 * chunks. Its maximum length is 260 bytes.
2194 if (260 < ntohs(param.p->length)) {
2195 sctp_process_inv_paramlength(asoc, param.p,
2197 retval = SCTP_IERROR_ABORT;
2201 case SCTP_PARAM_HMAC_ALGO:
2202 if (!ep->auth_enable)
2205 hmacs = (struct sctp_hmac_algo_param *)param.p;
2206 n_elt = (ntohs(param.p->length) -
2207 sizeof(struct sctp_paramhdr)) >> 1;
2209 /* SCTP-AUTH: Section 6.1
2210 * The HMAC algorithm based on SHA-1 MUST be supported and
2211 * included in the HMAC-ALGO parameter.
2213 for (i = 0; i < n_elt; i++) {
2214 id = ntohs(hmacs->hmac_ids[i]);
2216 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2220 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2221 sctp_process_inv_paramlength(asoc, param.p, chunk,
2223 retval = SCTP_IERROR_ABORT;
2228 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2229 __func__, ntohs(param.p->type), cid);
2231 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2237 /* Verify the INIT packet before we process it. */
2238 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
2239 const struct sctp_association *asoc, enum sctp_cid cid,
2240 struct sctp_init_chunk *peer_init,
2241 struct sctp_chunk *chunk, struct sctp_chunk **errp)
2243 union sctp_params param;
2244 bool has_cookie = false;
2247 /* Check for missing mandatory parameters. Note: Initial TSN is
2248 * also mandatory, but is not checked here since the valid range
2249 * is 0..2**32-1. RFC4960, section 3.3.3.
2251 if (peer_init->init_hdr.num_outbound_streams == 0 ||
2252 peer_init->init_hdr.num_inbound_streams == 0 ||
2253 peer_init->init_hdr.init_tag == 0 ||
2254 ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW)
2255 return sctp_process_inv_mandatory(asoc, chunk, errp);
2257 sctp_walk_params(param, peer_init, init_hdr.params) {
2258 if (param.p->type == SCTP_PARAM_STATE_COOKIE)
2262 /* There is a possibility that a parameter length was bad and
2263 * in that case we would have stoped walking the parameters.
2264 * The current param.p would point at the bad one.
2265 * Current consensus on the mailing list is to generate a PROTOCOL
2266 * VIOLATION error. We build the ERROR chunk here and let the normal
2267 * error handling code build and send the packet.
2269 if (param.v != (void *)chunk->chunk_end)
2270 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2272 /* The only missing mandatory param possible today is
2273 * the state cookie for an INIT-ACK chunk.
2275 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2276 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2279 /* Verify all the variable length parameters */
2280 sctp_walk_params(param, peer_init, init_hdr.params) {
2281 result = sctp_verify_param(net, ep, asoc, param, cid,
2284 case SCTP_IERROR_ABORT:
2285 case SCTP_IERROR_NOMEM:
2287 case SCTP_IERROR_ERROR:
2289 case SCTP_IERROR_NO_ERROR:
2294 } /* for (loop through all parameters) */
2299 /* Unpack the parameters in an INIT packet into an association.
2300 * Returns 0 on failure, else success.
2301 * FIXME: This is an association method.
2303 int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
2304 const union sctp_addr *peer_addr,
2305 struct sctp_init_chunk *peer_init, gfp_t gfp)
2307 struct net *net = sock_net(asoc->base.sk);
2308 struct sctp_transport *transport;
2309 struct list_head *pos, *temp;
2310 union sctp_params param;
2311 union sctp_addr addr;
2315 /* We must include the address that the INIT packet came from.
2316 * This is the only address that matters for an INIT packet.
2317 * When processing a COOKIE ECHO, we retrieve the from address
2318 * of the INIT from the cookie.
2321 /* This implementation defaults to making the first transport
2322 * added as the primary transport. The source address seems to
2323 * be a a better choice than any of the embedded addresses.
2325 if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2328 if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
2331 /* Process the initialization parameters. */
2332 sctp_walk_params(param, peer_init, init_hdr.params) {
2333 if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
2334 param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
2335 af = sctp_get_af_specific(param_type2af(param.p->type));
2336 af->from_addr_param(&addr, param.addr,
2337 chunk->sctp_hdr->source, 0);
2338 if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
2342 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2346 /* source address of chunk may not match any valid address */
2350 /* AUTH: After processing the parameters, make sure that we
2351 * have all the required info to potentially do authentications.
2353 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2354 !asoc->peer.peer_hmacs))
2355 asoc->peer.auth_capable = 0;
2357 /* In a non-backward compatible mode, if the peer claims
2358 * support for ADD-IP but not AUTH, the ADD-IP spec states
2359 * that we MUST ABORT the association. Section 6. The section
2360 * also give us an option to silently ignore the packet, which
2361 * is what we'll do here.
2363 if (!net->sctp.addip_noauth &&
2364 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2365 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2367 SCTP_PARAM_SET_PRIMARY);
2368 asoc->peer.asconf_capable = 0;
2372 /* Walk list of transports, removing transports in the UNKNOWN state. */
2373 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2374 transport = list_entry(pos, struct sctp_transport, transports);
2375 if (transport->state == SCTP_UNKNOWN) {
2376 sctp_assoc_rm_peer(asoc, transport);
2380 /* The fixed INIT headers are always in network byte
2383 asoc->peer.i.init_tag =
2384 ntohl(peer_init->init_hdr.init_tag);
2385 asoc->peer.i.a_rwnd =
2386 ntohl(peer_init->init_hdr.a_rwnd);
2387 asoc->peer.i.num_outbound_streams =
2388 ntohs(peer_init->init_hdr.num_outbound_streams);
2389 asoc->peer.i.num_inbound_streams =
2390 ntohs(peer_init->init_hdr.num_inbound_streams);
2391 asoc->peer.i.initial_tsn =
2392 ntohl(peer_init->init_hdr.initial_tsn);
2394 asoc->strreset_inseq = asoc->peer.i.initial_tsn;
2396 /* Apply the upper bounds for output streams based on peer's
2397 * number of inbound streams.
2399 if (asoc->c.sinit_num_ostreams >
2400 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2401 asoc->c.sinit_num_ostreams =
2402 ntohs(peer_init->init_hdr.num_inbound_streams);
2405 if (asoc->c.sinit_max_instreams >
2406 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2407 asoc->c.sinit_max_instreams =
2408 ntohs(peer_init->init_hdr.num_outbound_streams);
2411 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2412 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2414 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2415 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2417 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2418 * high (for example, implementations MAY use the size of the receiver
2419 * advertised window).
2421 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2423 transport->ssthresh = asoc->peer.i.a_rwnd;
2426 /* Set up the TSN tracking pieces. */
2427 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2428 asoc->peer.i.initial_tsn, gfp))
2431 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2433 * The stream sequence number in all the streams shall start
2434 * from 0 when the association is established. Also, when the
2435 * stream sequence number reaches the value 65535 the next
2436 * stream sequence number shall be set to 0.
2439 if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
2440 asoc->c.sinit_max_instreams, gfp))
2443 /* Update frag_point when stream_interleave may get changed. */
2444 sctp_assoc_update_frag_point(asoc);
2446 if (!asoc->temp && sctp_assoc_set_id(asoc, gfp))
2449 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2451 * When an endpoint has an ASCONF signaled change to be sent to the
2452 * remote endpoint it should do the following:
2454 * A2) A serial number should be assigned to the Chunk. The serial
2455 * number should be a monotonically increasing number. All serial
2456 * numbers are defined to be initialized at the start of the
2457 * association to the same value as the Initial TSN.
2459 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2463 /* Release the transport structures. */
2464 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2465 transport = list_entry(pos, struct sctp_transport, transports);
2466 if (transport->state != SCTP_ACTIVE)
2467 sctp_assoc_rm_peer(asoc, transport);
2475 /* Update asoc with the option described in param.
2477 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2479 * asoc is the association to update.
2480 * param is the variable length parameter to use for update.
2481 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2482 * If the current packet is an INIT we want to minimize the amount of
2483 * work we do. In particular, we should not build transport
2484 * structures for the addresses.
2486 static int sctp_process_param(struct sctp_association *asoc,
2487 union sctp_params param,
2488 const union sctp_addr *peer_addr,
2491 struct net *net = sock_net(asoc->base.sk);
2492 struct sctp_endpoint *ep = asoc->ep;
2493 union sctp_addr_param *addr_param;
2494 struct sctp_transport *t;
2495 enum sctp_scope scope;
2496 union sctp_addr addr;
2502 /* We maintain all INIT parameters in network byte order all the
2503 * time. This allows us to not worry about whether the parameters
2504 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2506 switch (param.p->type) {
2507 case SCTP_PARAM_IPV6_ADDRESS:
2508 if (PF_INET6 != asoc->base.sk->sk_family)
2512 case SCTP_PARAM_IPV4_ADDRESS:
2513 /* v4 addresses are not allowed on v6-only socket */
2514 if (ipv6_only_sock(asoc->base.sk))
2517 af = sctp_get_af_specific(param_type2af(param.p->type));
2518 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2519 scope = sctp_scope(peer_addr);
2520 if (sctp_in_scope(net, &addr, scope))
2521 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2525 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2526 if (!net->sctp.cookie_preserve_enable)
2529 stale = ntohl(param.life->lifespan_increment);
2531 /* Suggested Cookie Life span increment's unit is msec,
2534 asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale);
2537 case SCTP_PARAM_HOST_NAME_ADDRESS:
2538 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
2541 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2542 /* Turn off the default values first so we'll know which
2543 * ones are really set by the peer.
2545 asoc->peer.ipv4_address = 0;
2546 asoc->peer.ipv6_address = 0;
2548 /* Assume that peer supports the address family
2549 * by which it sends a packet.
2551 if (peer_addr->sa.sa_family == AF_INET6)
2552 asoc->peer.ipv6_address = 1;
2553 else if (peer_addr->sa.sa_family == AF_INET)
2554 asoc->peer.ipv4_address = 1;
2556 /* Cycle through address types; avoid divide by 0. */
2557 sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2559 sat /= sizeof(__u16);
2561 for (i = 0; i < sat; ++i) {
2562 switch (param.sat->types[i]) {
2563 case SCTP_PARAM_IPV4_ADDRESS:
2564 asoc->peer.ipv4_address = 1;
2567 case SCTP_PARAM_IPV6_ADDRESS:
2568 if (PF_INET6 == asoc->base.sk->sk_family)
2569 asoc->peer.ipv6_address = 1;
2572 case SCTP_PARAM_HOST_NAME_ADDRESS:
2573 asoc->peer.hostname_address = 1;
2576 default: /* Just ignore anything else. */
2582 case SCTP_PARAM_STATE_COOKIE:
2583 asoc->peer.cookie_len =
2584 ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
2585 kfree(asoc->peer.cookie);
2586 asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
2587 if (!asoc->peer.cookie)
2591 case SCTP_PARAM_HEARTBEAT_INFO:
2592 /* Would be odd to receive, but it causes no problems. */
2595 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2596 /* Rejected during verify stage. */
2599 case SCTP_PARAM_ECN_CAPABLE:
2600 asoc->peer.ecn_capable = 1;
2603 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2604 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2607 case SCTP_PARAM_SET_PRIMARY:
2608 if (!net->sctp.addip_enable)
2611 addr_param = param.v + sizeof(struct sctp_addip_param);
2613 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
2617 af->from_addr_param(&addr, addr_param,
2618 htons(asoc->peer.port), 0);
2620 /* if the address is invalid, we can't process it.
2621 * XXX: see spec for what to do.
2623 if (!af->addr_valid(&addr, NULL, NULL))
2626 t = sctp_assoc_lookup_paddr(asoc, &addr);
2630 sctp_assoc_set_primary(asoc, t);
2633 case SCTP_PARAM_SUPPORTED_EXT:
2634 sctp_process_ext_param(asoc, param);
2637 case SCTP_PARAM_FWD_TSN_SUPPORT:
2638 if (asoc->ep->prsctp_enable) {
2639 asoc->peer.prsctp_capable = 1;
2645 case SCTP_PARAM_RANDOM:
2646 if (!ep->auth_enable)
2649 /* Save peer's random parameter */
2650 kfree(asoc->peer.peer_random);
2651 asoc->peer.peer_random = kmemdup(param.p,
2652 ntohs(param.p->length), gfp);
2653 if (!asoc->peer.peer_random) {
2659 case SCTP_PARAM_HMAC_ALGO:
2660 if (!ep->auth_enable)
2663 /* Save peer's HMAC list */
2664 kfree(asoc->peer.peer_hmacs);
2665 asoc->peer.peer_hmacs = kmemdup(param.p,
2666 ntohs(param.p->length), gfp);
2667 if (!asoc->peer.peer_hmacs) {
2672 /* Set the default HMAC the peer requested*/
2673 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2676 case SCTP_PARAM_CHUNKS:
2677 if (!ep->auth_enable)
2680 kfree(asoc->peer.peer_chunks);
2681 asoc->peer.peer_chunks = kmemdup(param.p,
2682 ntohs(param.p->length), gfp);
2683 if (!asoc->peer.peer_chunks)
2688 /* Any unrecognized parameters should have been caught
2689 * and handled by sctp_verify_param() which should be
2690 * called prior to this routine. Simply log the error
2693 pr_debug("%s: ignoring param:%d for association:%p.\n",
2694 __func__, ntohs(param.p->type), asoc);
2701 /* Select a new verification tag. */
2702 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2704 /* I believe that this random number generator complies with RFC1750.
2705 * A tag of 0 is reserved for special cases (e.g. INIT).
2710 get_random_bytes(&x, sizeof(__u32));
2716 /* Select an initial TSN to send during startup. */
2717 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2721 get_random_bytes(&retval, sizeof(__u32));
2726 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2728 * 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
2729 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2730 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2734 * | Address Parameter |
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2736 * | ASCONF Parameter #1 |
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 * | ASCONF Parameter #N |
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2745 * Address Parameter and other parameter will not be wrapped in this function
2747 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2748 union sctp_addr *addr,
2751 struct sctp_addiphdr asconf;
2752 struct sctp_chunk *retval;
2753 int length = sizeof(asconf) + vparam_len;
2754 union sctp_addr_param addrparam;
2756 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2758 addrlen = af->to_addr_param(addr, &addrparam);
2763 /* Create the chunk. */
2764 retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length,
2769 asconf.serial = htonl(asoc->addip_serial++);
2771 retval->subh.addip_hdr =
2772 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2773 retval->param_hdr.v =
2774 sctp_addto_chunk(retval, addrlen, &addrparam);
2780 * 3.2.1 Add IP Address
2782 * 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
2783 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2784 * | Type = 0xC001 | Length = Variable |
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | ASCONF-Request Correlation ID |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | Address Parameter |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * 3.2.2 Delete IP Address
2793 * 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
2794 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 * | Type = 0xC002 | Length = Variable |
2796 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2797 * | ASCONF-Request Correlation ID |
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | Address Parameter |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2804 union sctp_addr *laddr,
2805 struct sockaddr *addrs,
2806 int addrcnt, __be16 flags)
2808 union sctp_addr_param addr_param;
2809 struct sctp_addip_param param;
2810 int paramlen = sizeof(param);
2811 struct sctp_chunk *retval;
2812 int addr_param_len = 0;
2813 union sctp_addr *addr;
2814 int totallen = 0, i;
2819 /* Get total length of all the address parameters. */
2821 for (i = 0; i < addrcnt; i++) {
2823 af = sctp_get_af_specific(addr->v4.sin_family);
2824 addr_param_len = af->to_addr_param(addr, &addr_param);
2826 totallen += paramlen;
2827 totallen += addr_param_len;
2829 addr_buf += af->sockaddr_len;
2830 if (asoc->asconf_addr_del_pending && !del_pickup) {
2831 /* reuse the parameter length from the same scope one */
2832 totallen += paramlen;
2833 totallen += addr_param_len;
2836 pr_debug("%s: picked same-scope del_pending addr, "
2837 "totallen for all addresses is %d\n",
2838 __func__, totallen);
2842 /* Create an asconf chunk with the required length. */
2843 retval = sctp_make_asconf(asoc, laddr, totallen);
2847 /* Add the address parameters to the asconf chunk. */
2849 for (i = 0; i < addrcnt; i++) {
2851 af = sctp_get_af_specific(addr->v4.sin_family);
2852 addr_param_len = af->to_addr_param(addr, &addr_param);
2853 param.param_hdr.type = flags;
2854 param.param_hdr.length = htons(paramlen + addr_param_len);
2855 param.crr_id = htonl(i);
2857 sctp_addto_chunk(retval, paramlen, ¶m);
2858 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2860 addr_buf += af->sockaddr_len;
2862 if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
2863 addr = asoc->asconf_addr_del_pending;
2864 af = sctp_get_af_specific(addr->v4.sin_family);
2865 addr_param_len = af->to_addr_param(addr, &addr_param);
2866 param.param_hdr.type = SCTP_PARAM_DEL_IP;
2867 param.param_hdr.length = htons(paramlen + addr_param_len);
2868 param.crr_id = htonl(i);
2870 sctp_addto_chunk(retval, paramlen, ¶m);
2871 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2877 * 3.2.4 Set Primary IP Address
2879 * 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
2880 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2881 * | Type =0xC004 | Length = Variable |
2882 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2883 * | ASCONF-Request Correlation ID |
2884 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2885 * | Address Parameter |
2886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2888 * Create an ASCONF chunk with Set Primary IP address parameter.
2890 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2891 union sctp_addr *addr)
2893 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2894 union sctp_addr_param addrparam;
2895 struct sctp_addip_param param;
2896 struct sctp_chunk *retval;
2897 int len = sizeof(param);
2900 addrlen = af->to_addr_param(addr, &addrparam);
2905 /* Create the chunk and make asconf header. */
2906 retval = sctp_make_asconf(asoc, addr, len);
2910 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2911 param.param_hdr.length = htons(len);
2914 sctp_addto_chunk(retval, sizeof(param), ¶m);
2915 sctp_addto_chunk(retval, addrlen, &addrparam);
2920 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2922 * 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
2923 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2924 * | Type = 0x80 | Chunk Flags | Chunk Length |
2925 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2927 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2928 * | ASCONF Parameter Response#1 |
2929 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2933 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2934 * | ASCONF Parameter Response#N |
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2937 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2939 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2940 __u32 serial, int vparam_len)
2942 struct sctp_addiphdr asconf;
2943 struct sctp_chunk *retval;
2944 int length = sizeof(asconf) + vparam_len;
2946 /* Create the chunk. */
2947 retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length,
2952 asconf.serial = htonl(serial);
2954 retval->subh.addip_hdr =
2955 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2960 /* Add response parameters to an ASCONF_ACK chunk. */
2961 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2963 struct sctp_addip_param *asconf_param)
2965 struct sctp_addip_param ack_param;
2966 struct sctp_errhdr err_param;
2967 int asconf_param_len = 0;
2968 int err_param_len = 0;
2969 __be16 response_type;
2971 if (SCTP_ERROR_NO_ERROR == err_code) {
2972 response_type = SCTP_PARAM_SUCCESS_REPORT;
2974 response_type = SCTP_PARAM_ERR_CAUSE;
2975 err_param_len = sizeof(err_param);
2978 ntohs(asconf_param->param_hdr.length);
2981 /* Add Success Indication or Error Cause Indication parameter. */
2982 ack_param.param_hdr.type = response_type;
2983 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2986 ack_param.crr_id = crr_id;
2987 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2989 if (SCTP_ERROR_NO_ERROR == err_code)
2992 /* Add Error Cause parameter. */
2993 err_param.cause = err_code;
2994 err_param.length = htons(err_param_len + asconf_param_len);
2995 sctp_addto_chunk(chunk, err_param_len, &err_param);
2997 /* Add the failed TLV copied from ASCONF chunk. */
2999 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
3002 /* Process a asconf parameter. */
3003 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
3004 struct sctp_chunk *asconf,
3005 struct sctp_addip_param *asconf_param)
3007 union sctp_addr_param *addr_param;
3008 struct sctp_transport *peer;
3009 union sctp_addr addr;
3012 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3014 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
3015 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
3016 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
3017 return SCTP_ERROR_UNKNOWN_PARAM;
3019 switch (addr_param->p.type) {
3020 case SCTP_PARAM_IPV6_ADDRESS:
3021 if (!asoc->peer.ipv6_address)
3022 return SCTP_ERROR_DNS_FAILED;
3024 case SCTP_PARAM_IPV4_ADDRESS:
3025 if (!asoc->peer.ipv4_address)
3026 return SCTP_ERROR_DNS_FAILED;
3029 return SCTP_ERROR_DNS_FAILED;
3032 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3034 return SCTP_ERROR_DNS_FAILED;
3036 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
3038 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3039 * or multicast address.
3040 * (note: wildcard is permitted and requires special handling so
3041 * make sure we check for that)
3043 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
3044 return SCTP_ERROR_DNS_FAILED;
3046 switch (asconf_param->param_hdr.type) {
3047 case SCTP_PARAM_ADD_IP:
3049 * If the address 0.0.0.0 or ::0 is provided, the source
3050 * address of the packet MUST be added.
3052 if (af->is_any(&addr))
3053 memcpy(&addr, &asconf->source, sizeof(addr));
3055 if (security_sctp_bind_connect(asoc->ep->base.sk,
3057 (struct sockaddr *)&addr,
3059 return SCTP_ERROR_REQ_REFUSED;
3061 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3062 * request and does not have the local resources to add this
3063 * new address to the association, it MUST return an Error
3064 * Cause TLV set to the new error code 'Operation Refused
3065 * Due to Resource Shortage'.
3068 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
3070 return SCTP_ERROR_RSRC_LOW;
3072 /* Start the heartbeat timer. */
3073 sctp_transport_reset_hb_timer(peer);
3074 asoc->new_transport = peer;
3076 case SCTP_PARAM_DEL_IP:
3077 /* ADDIP 4.3 D7) If a request is received to delete the
3078 * last remaining IP address of a peer endpoint, the receiver
3079 * MUST send an Error Cause TLV with the error cause set to the
3080 * new error code 'Request to Delete Last Remaining IP Address'.
3082 if (asoc->peer.transport_count == 1)
3083 return SCTP_ERROR_DEL_LAST_IP;
3085 /* ADDIP 4.3 D8) If a request is received to delete an IP
3086 * address which is also the source address of the IP packet
3087 * which contained the ASCONF chunk, the receiver MUST reject
3088 * this request. To reject the request the receiver MUST send
3089 * an Error Cause TLV set to the new error code 'Request to
3090 * Delete Source IP Address'
3092 if (sctp_cmp_addr_exact(&asconf->source, &addr))
3093 return SCTP_ERROR_DEL_SRC_IP;
3096 * If the address 0.0.0.0 or ::0 is provided, all
3097 * addresses of the peer except the source address of the
3098 * packet MUST be deleted.
3100 if (af->is_any(&addr)) {
3101 sctp_assoc_set_primary(asoc, asconf->transport);
3102 sctp_assoc_del_nonprimary_peers(asoc,
3104 return SCTP_ERROR_NO_ERROR;
3107 /* If the address is not part of the association, the
3108 * ASCONF-ACK with Error Cause Indication Parameter
3109 * which including cause of Unresolvable Address should
3112 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3114 return SCTP_ERROR_DNS_FAILED;
3116 sctp_assoc_rm_peer(asoc, peer);
3118 case SCTP_PARAM_SET_PRIMARY:
3119 /* ADDIP Section 4.2.4
3120 * If the address 0.0.0.0 or ::0 is provided, the receiver
3121 * MAY mark the source address of the packet as its
3124 if (af->is_any(&addr))
3125 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3127 if (security_sctp_bind_connect(asoc->ep->base.sk,
3128 SCTP_PARAM_SET_PRIMARY,
3129 (struct sockaddr *)&addr,
3131 return SCTP_ERROR_REQ_REFUSED;
3133 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3135 return SCTP_ERROR_DNS_FAILED;
3137 sctp_assoc_set_primary(asoc, peer);
3141 return SCTP_ERROR_NO_ERROR;
3144 /* Verify the ASCONF packet before we process it. */
3145 bool sctp_verify_asconf(const struct sctp_association *asoc,
3146 struct sctp_chunk *chunk, bool addr_param_needed,
3147 struct sctp_paramhdr **errp)
3149 struct sctp_addip_chunk *addip;
3150 bool addr_param_seen = false;
3151 union sctp_params param;
3153 addip = (struct sctp_addip_chunk *)chunk->chunk_hdr;
3154 sctp_walk_params(param, addip, addip_hdr.params) {
3155 size_t length = ntohs(param.p->length);
3158 switch (param.p->type) {
3159 case SCTP_PARAM_ERR_CAUSE:
3161 case SCTP_PARAM_IPV4_ADDRESS:
3162 if (length != sizeof(struct sctp_ipv4addr_param))
3164 /* ensure there is only one addr param and it's in the
3165 * beginning of addip_hdr params, or we reject it.
3167 if (param.v != addip->addip_hdr.params)
3169 addr_param_seen = true;
3171 case SCTP_PARAM_IPV6_ADDRESS:
3172 if (length != sizeof(struct sctp_ipv6addr_param))
3174 if (param.v != addip->addip_hdr.params)
3176 addr_param_seen = true;
3178 case SCTP_PARAM_ADD_IP:
3179 case SCTP_PARAM_DEL_IP:
3180 case SCTP_PARAM_SET_PRIMARY:
3181 /* In ASCONF chunks, these need to be first. */
3182 if (addr_param_needed && !addr_param_seen)
3184 length = ntohs(param.addip->param_hdr.length);
3185 if (length < sizeof(struct sctp_addip_param) +
3189 case SCTP_PARAM_SUCCESS_REPORT:
3190 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3191 if (length != sizeof(struct sctp_addip_param))
3195 /* This is unkown to us, reject! */
3200 /* Remaining sanity checks. */
3201 if (addr_param_needed && !addr_param_seen)
3203 if (!addr_param_needed && addr_param_seen)
3205 if (param.v != chunk->chunk_end)
3211 /* Process an incoming ASCONF chunk with the next expected serial no. and
3212 * return an ASCONF_ACK chunk to be sent in response.
3214 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3215 struct sctp_chunk *asconf)
3217 union sctp_addr_param *addr_param;
3218 struct sctp_addip_chunk *addip;
3219 struct sctp_chunk *asconf_ack;
3220 bool all_param_pass = true;
3221 struct sctp_addiphdr *hdr;
3222 int length = 0, chunk_len;
3223 union sctp_params param;
3227 addip = (struct sctp_addip_chunk *)asconf->chunk_hdr;
3228 chunk_len = ntohs(asconf->chunk_hdr->length) -
3229 sizeof(struct sctp_chunkhdr);
3230 hdr = (struct sctp_addiphdr *)asconf->skb->data;
3231 serial = ntohl(hdr->serial);
3233 /* Skip the addiphdr and store a pointer to address parameter. */
3234 length = sizeof(*hdr);
3235 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3236 chunk_len -= length;
3238 /* Skip the address parameter and store a pointer to the first
3241 length = ntohs(addr_param->p.length);
3242 chunk_len -= length;
3244 /* create an ASCONF_ACK chunk.
3245 * Based on the definitions of parameters, we know that the size of
3246 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3249 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4);
3253 /* Process the TLVs contained within the ASCONF chunk. */
3254 sctp_walk_params(param, addip, addip_hdr.params) {
3255 /* Skip preceeding address parameters. */
3256 if (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
3257 param.p->type == SCTP_PARAM_IPV6_ADDRESS)
3260 err_code = sctp_process_asconf_param(asoc, asconf,
3263 * If an error response is received for a TLV parameter,
3264 * all TLVs with no response before the failed TLV are
3265 * considered successful if not reported. All TLVs after
3266 * the failed response are considered unsuccessful unless
3267 * a specific success indication is present for the parameter.
3269 if (err_code != SCTP_ERROR_NO_ERROR)
3270 all_param_pass = false;
3271 if (!all_param_pass)
3272 sctp_add_asconf_response(asconf_ack, param.addip->crr_id,
3273 err_code, param.addip);
3275 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3276 * an IP address sends an 'Out of Resource' in its response, it
3277 * MUST also fail any subsequent add or delete requests bundled
3280 if (err_code == SCTP_ERROR_RSRC_LOW)
3284 asoc->peer.addip_serial++;
3286 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3287 * after freeing the reference to old asconf ack if any.
3290 sctp_chunk_hold(asconf_ack);
3291 list_add_tail(&asconf_ack->transmitted_list,
3292 &asoc->asconf_ack_list);
3298 /* Process a asconf parameter that is successfully acked. */
3299 static void sctp_asconf_param_success(struct sctp_association *asoc,
3300 struct sctp_addip_param *asconf_param)
3302 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3303 union sctp_addr_param *addr_param;
3304 struct sctp_sockaddr_entry *saddr;
3305 struct sctp_transport *transport;
3306 union sctp_addr addr;
3309 addr_param = (void *)asconf_param + sizeof(*asconf_param);
3311 /* We have checked the packet before, so we do not check again. */
3312 af = sctp_get_af_specific(param_type2af(addr_param->p.type));
3313 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3315 switch (asconf_param->param_hdr.type) {
3316 case SCTP_PARAM_ADD_IP:
3317 /* This is always done in BH context with a socket lock
3318 * held, so the list can not change.
3321 list_for_each_entry(saddr, &bp->address_list, list) {
3322 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3323 saddr->state = SCTP_ADDR_SRC;
3326 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3328 sctp_transport_dst_release(transport);
3331 case SCTP_PARAM_DEL_IP:
3333 sctp_del_bind_addr(bp, &addr);
3334 if (asoc->asconf_addr_del_pending != NULL &&
3335 sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) {
3336 kfree(asoc->asconf_addr_del_pending);
3337 asoc->asconf_addr_del_pending = NULL;
3340 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3342 sctp_transport_dst_release(transport);
3350 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3351 * for the given asconf parameter. If there is no response for this parameter,
3352 * return the error code based on the third argument 'no_err'.
3354 * A7) If an error response is received for a TLV parameter, all TLVs with no
3355 * response before the failed TLV are considered successful if not reported.
3356 * All TLVs after the failed response are considered unsuccessful unless a
3357 * specific success indication is present for the parameter.
3359 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3360 struct sctp_addip_param *asconf_param,
3363 struct sctp_addip_param *asconf_ack_param;
3364 struct sctp_errhdr *err_param;
3370 err_code = SCTP_ERROR_NO_ERROR;
3372 err_code = SCTP_ERROR_REQ_REFUSED;
3374 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3375 sizeof(struct sctp_chunkhdr);
3377 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3378 * the first asconf_ack parameter.
3380 length = sizeof(struct sctp_addiphdr);
3381 asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data +
3383 asconf_ack_len -= length;
3385 while (asconf_ack_len > 0) {
3386 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3387 switch (asconf_ack_param->param_hdr.type) {
3388 case SCTP_PARAM_SUCCESS_REPORT:
3389 return SCTP_ERROR_NO_ERROR;
3390 case SCTP_PARAM_ERR_CAUSE:
3391 length = sizeof(*asconf_ack_param);
3392 err_param = (void *)asconf_ack_param + length;
3393 asconf_ack_len -= length;
3394 if (asconf_ack_len > 0)
3395 return err_param->cause;
3397 return SCTP_ERROR_INV_PARAM;
3400 return SCTP_ERROR_INV_PARAM;
3404 length = ntohs(asconf_ack_param->param_hdr.length);
3405 asconf_ack_param = (void *)asconf_ack_param + length;
3406 asconf_ack_len -= length;
3412 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3413 int sctp_process_asconf_ack(struct sctp_association *asoc,
3414 struct sctp_chunk *asconf_ack)
3416 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3417 struct sctp_addip_param *asconf_param;
3418 __be16 err_code = SCTP_ERROR_NO_ERROR;
3419 union sctp_addr_param *addr_param;
3420 int asconf_len = asconf->skb->len;
3421 int all_param_pass = 0;
3426 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3427 * a pointer to address parameter.
3429 length = sizeof(struct sctp_addip_chunk);
3430 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3431 asconf_len -= length;
3433 /* Skip the address parameter in the last asconf sent and store a
3434 * pointer to the first asconf parameter.
3436 length = ntohs(addr_param->p.length);
3437 asconf_param = (void *)addr_param + length;
3438 asconf_len -= length;
3441 * A8) If there is no response(s) to specific TLV parameter(s), and no
3442 * failures are indicated, then all request(s) are considered
3445 if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr))
3448 /* Process the TLVs contained in the last sent ASCONF chunk. */
3449 while (asconf_len > 0) {
3451 err_code = SCTP_ERROR_NO_ERROR;
3453 err_code = sctp_get_asconf_response(asconf_ack,
3456 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3461 case SCTP_ERROR_NO_ERROR:
3462 sctp_asconf_param_success(asoc, asconf_param);
3465 case SCTP_ERROR_RSRC_LOW:
3469 case SCTP_ERROR_UNKNOWN_PARAM:
3470 /* Disable sending this type of asconf parameter in
3473 asoc->peer.addip_disabled_mask |=
3474 asconf_param->param_hdr.type;
3477 case SCTP_ERROR_REQ_REFUSED:
3478 case SCTP_ERROR_DEL_LAST_IP:
3479 case SCTP_ERROR_DEL_SRC_IP:
3484 /* Skip the processed asconf parameter and move to the next
3487 length = ntohs(asconf_param->param_hdr.length);
3488 asconf_param = (void *)asconf_param + length;
3489 asconf_len -= length;
3492 if (no_err && asoc->src_out_of_asoc_ok) {
3493 asoc->src_out_of_asoc_ok = 0;
3494 sctp_transport_immediate_rtx(asoc->peer.primary_path);
3497 /* Free the cached last sent asconf chunk. */
3498 list_del_init(&asconf->transmitted_list);
3499 sctp_chunk_free(asconf);
3500 asoc->addip_last_asconf = NULL;
3505 /* Make a FWD TSN chunk. */
3506 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3507 __u32 new_cum_tsn, size_t nstreams,
3508 struct sctp_fwdtsn_skip *skiplist)
3510 struct sctp_chunk *retval = NULL;
3511 struct sctp_fwdtsn_hdr ftsn_hdr;
3512 struct sctp_fwdtsn_skip skip;
3516 hint = (nstreams + 1) * sizeof(__u32);
3518 retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC);
3523 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3524 retval->subh.fwdtsn_hdr =
3525 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3527 for (i = 0; i < nstreams; i++) {
3528 skip.stream = skiplist[i].stream;
3529 skip.ssn = skiplist[i].ssn;
3530 sctp_addto_chunk(retval, sizeof(skip), &skip);
3536 struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
3537 __u32 new_cum_tsn, size_t nstreams,
3538 struct sctp_ifwdtsn_skip *skiplist)
3540 struct sctp_chunk *retval = NULL;
3541 struct sctp_ifwdtsn_hdr ftsn_hdr;
3544 hint = (nstreams + 1) * sizeof(__u32);
3546 retval = sctp_make_control(asoc, SCTP_CID_I_FWD_TSN, 0, hint,
3551 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3552 retval->subh.ifwdtsn_hdr =
3553 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3555 sctp_addto_chunk(retval, nstreams * sizeof(skiplist[0]), skiplist);
3560 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3562 * 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
3563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3564 * | Type = 130 | Chunk Flags | Chunk Length |
3565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3567 * / Re-configuration Parameter /
3569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3571 * / Re-configuration Parameter (optional) /
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3575 static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc,
3578 struct sctp_reconf_chunk *reconf;
3579 struct sctp_chunk *retval;
3581 retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length,
3586 reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr;
3587 retval->param_hdr.v = reconf->params;
3592 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3594 * 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
3595 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3596 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3597 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3598 * | Re-configuration Request Sequence Number |
3599 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3600 * | Re-configuration Response Sequence Number |
3601 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3602 * | Sender's Last Assigned TSN |
3603 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3604 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3608 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3611 * RE-CONFIG 4.2 (STREAM IN RESET)
3613 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
3614 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3615 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3616 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3617 * | Re-configuration Request Sequence Number |
3618 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3619 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3620 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3622 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3623 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3624 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3626 struct sctp_chunk *sctp_make_strreset_req(
3627 const struct sctp_association *asoc,
3628 __u16 stream_num, __be16 *stream_list,
3631 __u16 stream_len = stream_num * sizeof(__u16);
3632 struct sctp_strreset_outreq outreq;
3633 struct sctp_strreset_inreq inreq;
3634 struct sctp_chunk *retval;
3635 __u16 outlen, inlen;
3637 outlen = (sizeof(outreq) + stream_len) * out;
3638 inlen = (sizeof(inreq) + stream_len) * in;
3640 retval = sctp_make_reconf(asoc, outlen + inlen);
3645 outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST;
3646 outreq.param_hdr.length = htons(outlen);
3647 outreq.request_seq = htonl(asoc->strreset_outseq);
3648 outreq.response_seq = htonl(asoc->strreset_inseq - 1);
3649 outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1);
3651 sctp_addto_chunk(retval, sizeof(outreq), &outreq);
3654 sctp_addto_chunk(retval, stream_len, stream_list);
3658 inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST;
3659 inreq.param_hdr.length = htons(inlen);
3660 inreq.request_seq = htonl(asoc->strreset_outseq + out);
3662 sctp_addto_chunk(retval, sizeof(inreq), &inreq);
3665 sctp_addto_chunk(retval, stream_len, stream_list);
3671 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3673 * 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
3674 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3675 * | Parameter Type = 15 | Parameter Length = 8 |
3676 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3677 * | Re-configuration Request Sequence Number |
3678 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3680 struct sctp_chunk *sctp_make_strreset_tsnreq(
3681 const struct sctp_association *asoc)
3683 struct sctp_strreset_tsnreq tsnreq;
3684 __u16 length = sizeof(tsnreq);
3685 struct sctp_chunk *retval;
3687 retval = sctp_make_reconf(asoc, length);
3691 tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST;
3692 tsnreq.param_hdr.length = htons(length);
3693 tsnreq.request_seq = htonl(asoc->strreset_outseq);
3695 sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq);
3700 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3702 * 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
3703 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3704 * | Parameter Type = 17 | Parameter Length = 12 |
3705 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3706 * | Re-configuration Request Sequence Number |
3707 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3708 * | Number of new streams | Reserved |
3709 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3711 struct sctp_chunk *sctp_make_strreset_addstrm(
3712 const struct sctp_association *asoc,
3713 __u16 out, __u16 in)
3715 struct sctp_strreset_addstrm addstrm;
3716 __u16 size = sizeof(addstrm);
3717 struct sctp_chunk *retval;
3719 retval = sctp_make_reconf(asoc, (!!out + !!in) * size);
3724 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
3725 addstrm.param_hdr.length = htons(size);
3726 addstrm.number_of_streams = htons(out);
3727 addstrm.request_seq = htonl(asoc->strreset_outseq);
3728 addstrm.reserved = 0;
3730 sctp_addto_chunk(retval, size, &addstrm);
3734 addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;
3735 addstrm.param_hdr.length = htons(size);
3736 addstrm.number_of_streams = htons(in);
3737 addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);
3738 addstrm.reserved = 0;
3740 sctp_addto_chunk(retval, size, &addstrm);
3746 /* RE-CONFIG 4.4 (RESP)
3748 * 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
3749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3750 * | Parameter Type = 16 | Parameter Length |
3751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3752 * | Re-configuration Response Sequence Number |
3753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3757 struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
3758 __u32 result, __u32 sn)
3760 struct sctp_strreset_resp resp;
3761 __u16 length = sizeof(resp);
3762 struct sctp_chunk *retval;
3764 retval = sctp_make_reconf(asoc, length);
3768 resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3769 resp.param_hdr.length = htons(length);
3770 resp.response_seq = htonl(sn);
3771 resp.result = htonl(result);
3773 sctp_addto_chunk(retval, sizeof(resp), &resp);
3778 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3780 * 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
3781 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3782 * | Parameter Type = 16 | Parameter Length |
3783 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3784 * | Re-configuration Response Sequence Number |
3785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3788 * | Sender's Next TSN (optional) |
3789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3790 * | Receiver's Next TSN (optional) |
3791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3793 struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
3794 __u32 result, __u32 sn,
3798 struct sctp_strreset_resptsn tsnresp;
3799 __u16 length = sizeof(tsnresp);
3800 struct sctp_chunk *retval;
3802 retval = sctp_make_reconf(asoc, length);
3806 tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE;
3807 tsnresp.param_hdr.length = htons(length);
3809 tsnresp.response_seq = htonl(sn);
3810 tsnresp.result = htonl(result);
3811 tsnresp.senders_next_tsn = htonl(sender_tsn);
3812 tsnresp.receivers_next_tsn = htonl(receiver_tsn);
3814 sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp);
3819 bool sctp_verify_reconf(const struct sctp_association *asoc,
3820 struct sctp_chunk *chunk,
3821 struct sctp_paramhdr **errp)
3823 struct sctp_reconf_chunk *hdr;
3824 union sctp_params param;
3828 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
3829 sctp_walk_params(param, hdr, params) {
3830 __u16 length = ntohs(param.p->length);
3835 switch (param.p->type) {
3836 case SCTP_PARAM_RESET_OUT_REQUEST:
3837 if (length < sizeof(struct sctp_strreset_outreq) ||
3838 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3839 last != SCTP_PARAM_RESET_IN_REQUEST))
3842 case SCTP_PARAM_RESET_IN_REQUEST:
3843 if (length < sizeof(struct sctp_strreset_inreq) ||
3844 (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
3847 case SCTP_PARAM_RESET_RESPONSE:
3848 if ((length != sizeof(struct sctp_strreset_resp) &&
3849 length != sizeof(struct sctp_strreset_resptsn)) ||
3850 (last && last != SCTP_PARAM_RESET_RESPONSE &&
3851 last != SCTP_PARAM_RESET_OUT_REQUEST))
3854 case SCTP_PARAM_RESET_TSN_REQUEST:
3856 sizeof(struct sctp_strreset_tsnreq) || last)
3859 case SCTP_PARAM_RESET_ADD_IN_STREAMS:
3860 if (length != sizeof(struct sctp_strreset_addstrm) ||
3861 (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
3864 case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
3865 if (length != sizeof(struct sctp_strreset_addstrm) ||
3866 (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
3873 last = param.p->type;