1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <linux-sctp@vger.kernel.org>
34 * Written or modified by:
35 * La Monte H.P. Yarroll <piggy@acm.org>
36 * Karl Knutson <karl@athena.chicago.il.us>
37 * C. Robin <chris@hundredacre.ac.uk>
38 * Jon Grimm <jgrimm@us.ibm.com>
39 * Xingang Guo <xingang.guo@intel.com>
40 * Dajiang Zhang <dajiang.zhang@nokia.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
44 * Kevin Gao <kevin.gao@intel.com>
47 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
49 #include <linux/types.h>
50 #include <linux/kernel.h>
52 #include <linux/ipv6.h>
53 #include <linux/net.h>
54 #include <linux/inet.h>
55 #include <linux/scatterlist.h>
56 #include <linux/crypto.h>
57 #include <linux/slab.h>
60 #include <linux/skbuff.h>
61 #include <linux/random.h> /* for get_random_bytes */
62 #include <net/sctp/sctp.h>
63 #include <net/sctp/sm.h>
65 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
66 __u8 type
, __u8 flags
, int paylen
);
67 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
68 __u8 flags
, int paylen
);
69 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
70 __u8 type
, __u8 flags
, int paylen
);
71 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
72 const struct sctp_association
*asoc
,
73 const struct sctp_chunk
*init_chunk
,
75 const __u8
*raw_addrs
, int addrs_len
);
76 static int sctp_process_param(struct sctp_association
*asoc
,
77 union sctp_params param
,
78 const union sctp_addr
*peer_addr
,
80 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
83 /* Control chunk destructor */
84 static void sctp_control_release_owner(struct sk_buff
*skb
)
86 /*TODO: do memory release */
89 static void sctp_control_set_owner_w(struct sctp_chunk
*chunk
)
91 struct sctp_association
*asoc
= chunk
->asoc
;
92 struct sk_buff
*skb
= chunk
->skb
;
94 /* TODO: properly account for control chunks.
95 * To do it right we'll need:
96 * 1) endpoint if association isn't known.
97 * 2) proper memory accounting.
99 * For now don't do anything for now.
101 skb
->sk
= asoc
? asoc
->base
.sk
: NULL
;
102 skb
->destructor
= sctp_control_release_owner
;
105 /* What was the inbound interface for this chunk? */
106 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
111 af
= sctp_get_af_specific(ipver2af(ip_hdr(chunk
->skb
)->version
));
113 iif
= af
->skb_iif(chunk
->skb
);
118 /* RFC 2960 3.3.2 Initiation (INIT) (1)
120 * Note 2: The ECN capable field is reserved for future use of
121 * Explicit Congestion Notification.
123 static const struct sctp_paramhdr ecap_param
= {
124 SCTP_PARAM_ECN_CAPABLE
,
125 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
127 static const struct sctp_paramhdr prsctp_param
= {
128 SCTP_PARAM_FWD_TSN_SUPPORT
,
129 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
132 /* A helper to initialize an op error inside a
133 * provided chunk, as most cause codes will be embedded inside an
136 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
142 /* Cause code constants are now defined in network order. */
143 err
.cause
= cause_code
;
144 len
= sizeof(sctp_errhdr_t
) + paylen
;
145 err
.length
= htons(len
);
146 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
149 /* A helper to initialize an op error inside a
150 * provided chunk, as most cause codes will be embedded inside an
151 * abort chunk. Differs from sctp_init_cause in that it won't oops
152 * if there isn't enough space in the op error chunk
154 static int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
160 /* Cause code constants are now defined in network order. */
161 err
.cause
= cause_code
;
162 len
= sizeof(sctp_errhdr_t
) + paylen
;
163 err
.length
= htons(len
);
165 if (skb_tailroom(chunk
->skb
) < len
)
167 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
,
168 sizeof(sctp_errhdr_t
),
172 /* 3.3.2 Initiation (INIT) (1)
174 * This chunk is used to initiate a SCTP association between two
175 * endpoints. The format of the INIT chunk is shown below:
178 * 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
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
180 * | Type = 1 | Chunk Flags | Chunk Length |
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 * | Advertised Receiver Window Credit (a_rwnd) |
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * | Number of Outbound Streams | Number of Inbound Streams |
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
191 * / Optional/Variable-Length Parameters /
193 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
196 * The INIT chunk contains the following parameters. Unless otherwise
197 * noted, each parameter MUST only be included once in the INIT chunk.
199 * Fixed Parameters Status
200 * ----------------------------------------------
201 * Initiate Tag Mandatory
202 * Advertised Receiver Window Credit Mandatory
203 * Number of Outbound Streams Mandatory
204 * Number of Inbound Streams Mandatory
205 * Initial TSN Mandatory
207 * Variable Parameters Status Type Value
208 * -------------------------------------------------------------
209 * IPv4 Address (Note 1) Optional 5
210 * IPv6 Address (Note 1) Optional 6
211 * Cookie Preservative Optional 9
212 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
213 * Host Name Address (Note 3) Optional 11
214 * Supported Address Types (Note 4) Optional 12
216 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
217 const struct sctp_bind_addr
*bp
,
218 gfp_t gfp
, int vparam_len
)
220 struct net
*net
= sock_net(asoc
->base
.sk
);
222 union sctp_params addrs
;
224 struct sctp_chunk
*retval
= NULL
;
225 int num_types
, addrs_len
= 0;
226 struct sctp_sock
*sp
;
227 sctp_supported_addrs_param_t sat
;
229 sctp_adaptation_ind_param_t aiparam
;
230 sctp_supported_ext_param_t ext_param
;
233 sctp_paramhdr_t
*auth_chunks
= NULL
,
236 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 * Note 1: The INIT chunks can contain multiple addresses that
239 * can be IPv4 and/or IPv6 in any combination.
243 /* Convert the provided bind address list to raw format. */
244 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
246 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
247 init
.a_rwnd
= htonl(asoc
->rwnd
);
248 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
249 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
250 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
252 /* How many address types are needed? */
253 sp
= sctp_sk(asoc
->base
.sk
);
254 num_types
= sp
->pf
->supported_addrs(sp
, types
);
256 chunksize
= sizeof(init
) + addrs_len
;
257 chunksize
+= WORD_ROUND(SCTP_SAT_LEN(num_types
));
258 chunksize
+= sizeof(ecap_param
);
260 if (net
->sctp
.prsctp_enable
)
261 chunksize
+= sizeof(prsctp_param
);
263 /* ADDIP: Section 4.2.7:
264 * An implementation supporting this extension [ADDIP] MUST list
265 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
266 * INIT-ACK parameters.
268 if (net
->sctp
.addip_enable
) {
269 extensions
[num_ext
] = SCTP_CID_ASCONF
;
270 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
274 if (sp
->adaptation_ind
)
275 chunksize
+= sizeof(aiparam
);
277 chunksize
+= vparam_len
;
279 /* Account for AUTH related parameters */
280 if (net
->sctp
.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
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
286 if (auth_hmacs
->length
)
287 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
291 /* Add CHUNKS parameter length */
292 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
293 if (auth_chunks
->length
)
294 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
298 extensions
[num_ext
] = SCTP_CID_AUTH
;
302 /* If we have any extensions to report, account for that */
304 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
307 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 * Note 3: An INIT chunk MUST NOT contain more than one Host
310 * Name address parameter. Moreover, the sender of the INIT
311 * MUST NOT combine any other address types with the Host Name
312 * address in the INIT. The receiver of INIT MUST ignore any
313 * other address types if the Host Name address parameter is
314 * present in the received INIT chunk.
316 * PLEASE DO NOT FIXME [This version does not support Host Name.]
319 retval
= sctp_make_control(asoc
, SCTP_CID_INIT
, 0, chunksize
);
323 retval
->subh
.init_hdr
=
324 sctp_addto_chunk(retval
, sizeof(init
), &init
);
325 retval
->param_hdr
.v
=
326 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
328 /* RFC 2960 3.3.2 Initiation (INIT) (1)
330 * Note 4: This parameter, when present, specifies all the
331 * address types the sending endpoint can support. The absence
332 * of this parameter indicates that the sending endpoint can
333 * support any address type.
335 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
336 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
337 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
338 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
340 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
342 /* Add the supported extensions parameter. Be nice and add this
343 * fist before addiding the parameters for the extensions themselves
346 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
347 ext_param
.param_hdr
.length
=
348 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
349 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
351 sctp_addto_param(retval
, num_ext
, extensions
);
354 if (net
->sctp
.prsctp_enable
)
355 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
357 if (sp
->adaptation_ind
) {
358 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
359 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
360 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
361 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
364 /* Add SCTP-AUTH chunks to the parameter list */
365 if (net
->sctp
.auth_enable
) {
366 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
367 asoc
->c
.auth_random
);
369 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
372 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
380 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
381 const struct sctp_chunk
*chunk
,
382 gfp_t gfp
, int unkparam_len
)
384 sctp_inithdr_t initack
;
385 struct sctp_chunk
*retval
;
386 union sctp_params addrs
;
387 struct sctp_sock
*sp
;
389 sctp_cookie_param_t
*cookie
;
392 sctp_adaptation_ind_param_t aiparam
;
393 sctp_supported_ext_param_t ext_param
;
396 sctp_paramhdr_t
*auth_chunks
= NULL
,
402 /* Note: there may be no addresses to embed. */
403 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
405 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
406 initack
.a_rwnd
= htonl(asoc
->rwnd
);
407 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
408 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
409 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
411 /* FIXME: We really ought to build the cookie right
412 * into the packet instead of allocating more fresh memory.
414 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
419 /* Calculate the total size of allocation, include the reserved
420 * space for reporting unknown parameters if it is specified.
422 sp
= sctp_sk(asoc
->base
.sk
);
423 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
425 /* Tell peer that we'll do ECN only if peer advertised such cap. */
426 if (asoc
->peer
.ecn_capable
)
427 chunksize
+= sizeof(ecap_param
);
429 if (asoc
->peer
.prsctp_capable
)
430 chunksize
+= sizeof(prsctp_param
);
432 if (asoc
->peer
.asconf_capable
) {
433 extensions
[num_ext
] = SCTP_CID_ASCONF
;
434 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
438 if (sp
->adaptation_ind
)
439 chunksize
+= sizeof(aiparam
);
441 if (asoc
->peer
.auth_capable
) {
442 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
443 chunksize
+= ntohs(auth_random
->length
);
445 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
446 if (auth_hmacs
->length
)
447 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
451 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
452 if (auth_chunks
->length
)
453 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
457 extensions
[num_ext
] = SCTP_CID_AUTH
;
462 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
465 /* Now allocate and fill out the chunk. */
466 retval
= sctp_make_control(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
);
470 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
472 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
473 * HEARTBEAT ACK, * etc.) to the same destination transport
474 * address from which it received the DATA or control chunk
475 * to which it is replying.
477 * [INIT ACK back to where the INIT came from.]
479 retval
->transport
= chunk
->transport
;
481 retval
->subh
.init_hdr
=
482 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
483 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
484 sctp_addto_chunk(retval
, cookie_len
, cookie
);
485 if (asoc
->peer
.ecn_capable
)
486 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
488 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
489 ext_param
.param_hdr
.length
=
490 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
491 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
493 sctp_addto_param(retval
, num_ext
, extensions
);
495 if (asoc
->peer
.prsctp_capable
)
496 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
498 if (sp
->adaptation_ind
) {
499 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
500 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
501 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
502 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
505 if (asoc
->peer
.auth_capable
) {
506 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
509 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
512 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
516 /* We need to remove the const qualifier at this point. */
517 retval
->asoc
= (struct sctp_association
*) asoc
;
526 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
528 * This chunk is used only during the initialization of an association.
529 * It is sent by the initiator of an association to its peer to complete
530 * the initialization process. This chunk MUST precede any DATA chunk
531 * sent within the association, but MAY be bundled with one or more DATA
532 * chunks in the same packet.
535 * 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
536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
537 * | Type = 10 |Chunk Flags | Length |
538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
545 * Set to zero on transmit and ignored on receipt.
547 * Length: 16 bits (unsigned integer)
549 * Set to the size of the chunk in bytes, including the 4 bytes of
550 * the chunk header and the size of the Cookie.
552 * Cookie: variable size
554 * This field must contain the exact cookie received in the
555 * State Cookie parameter from the previous INIT ACK.
557 * An implementation SHOULD make the cookie as small as possible
558 * to insure interoperability.
560 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
561 const struct sctp_chunk
*chunk
)
563 struct sctp_chunk
*retval
;
567 cookie
= asoc
->peer
.cookie
;
568 cookie_len
= asoc
->peer
.cookie_len
;
570 /* Build a cookie echo chunk. */
571 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ECHO
, 0, cookie_len
);
574 retval
->subh
.cookie_hdr
=
575 sctp_addto_chunk(retval
, cookie_len
, cookie
);
577 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
579 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
580 * HEARTBEAT ACK, * etc.) to the same destination transport
581 * address from which it * received the DATA or control chunk
582 * to which it is replying.
584 * [COOKIE ECHO back to where the INIT ACK came from.]
587 retval
->transport
= chunk
->transport
;
593 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
595 * This chunk is used only during the initialization of an
596 * association. It is used to acknowledge the receipt of a COOKIE
597 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
598 * within the association, but MAY be bundled with one or more DATA
599 * chunks or SACK chunk in the same SCTP packet.
602 * 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
603 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
604 * | Type = 11 |Chunk Flags | Length = 4 |
605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
607 * Chunk Flags: 8 bits
609 * Set to zero on transmit and ignored on receipt.
611 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
612 const struct sctp_chunk
*chunk
)
614 struct sctp_chunk
*retval
;
616 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0);
618 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
620 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
621 * HEARTBEAT ACK, * etc.) to the same destination transport
622 * address from which it * received the DATA or control chunk
623 * to which it is replying.
625 * [COOKIE ACK back to where the COOKIE ECHO came from.]
628 retval
->transport
= chunk
->transport
;
634 * Appendix A: Explicit Congestion Notification:
637 * RFC 2481 details a specific bit for a sender to send in the header of
638 * its next outbound TCP segment to indicate to its peer that it has
639 * reduced its congestion window. This is termed the CWR bit. For
640 * SCTP the same indication is made by including the CWR chunk.
641 * This chunk contains one data element, i.e. the TSN number that
642 * was sent in the ECNE chunk. This element represents the lowest
643 * TSN number in the datagram that was originally marked with the
647 * 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
648 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
649 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651 * | Lowest TSN Number |
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
654 * Note: The CWR is considered a Control chunk.
656 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
657 const __u32 lowest_tsn
,
658 const struct sctp_chunk
*chunk
)
660 struct sctp_chunk
*retval
;
663 cwr
.lowest_tsn
= htonl(lowest_tsn
);
664 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_CWR
, 0,
665 sizeof(sctp_cwrhdr_t
));
670 retval
->subh
.ecn_cwr_hdr
=
671 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
673 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
675 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
676 * HEARTBEAT ACK, * etc.) to the same destination transport
677 * address from which it * received the DATA or control chunk
678 * to which it is replying.
680 * [Report a reduced congestion window back to where the ECNE
684 retval
->transport
= chunk
->transport
;
690 /* Make an ECNE chunk. This is a congestion experienced report. */
691 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
692 const __u32 lowest_tsn
)
694 struct sctp_chunk
*retval
;
697 ecne
.lowest_tsn
= htonl(lowest_tsn
);
698 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_ECNE
, 0,
699 sizeof(sctp_ecnehdr_t
));
702 retval
->subh
.ecne_hdr
=
703 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
709 /* Make a DATA chunk for the given association from the provided
710 * parameters. However, do not populate the data payload.
712 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
713 const struct sctp_sndrcvinfo
*sinfo
,
714 int data_len
, __u8 flags
, __u16 ssn
)
716 struct sctp_chunk
*retval
;
717 struct sctp_datahdr dp
;
720 /* We assign the TSN as LATE as possible, not here when
721 * creating the chunk.
724 dp
.stream
= htons(sinfo
->sinfo_stream
);
725 dp
.ppid
= sinfo
->sinfo_ppid
;
727 /* Set the flags for an unordered send. */
728 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
729 flags
|= SCTP_DATA_UNORDERED
;
734 chunk_len
= sizeof(dp
) + data_len
;
735 retval
= sctp_make_data(asoc
, flags
, chunk_len
);
739 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
740 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
746 /* Create a selective ackowledgement (SACK) for the given
747 * association. This reports on which TSN's we've seen to date,
748 * including duplicates and gaps.
750 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
752 struct sctp_chunk
*retval
;
753 struct sctp_sackhdr sack
;
756 __u16 num_gabs
, num_dup_tsns
;
757 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
758 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
759 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
760 struct sctp_transport
*trans
;
762 memset(gabs
, 0, sizeof(gabs
));
763 ctsn
= sctp_tsnmap_get_ctsn(map
);
765 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__
, ctsn
);
767 /* How much room is needed in the chunk? */
768 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
769 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
771 /* Initialize the SACK header. */
772 sack
.cum_tsn_ack
= htonl(ctsn
);
773 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
774 sack
.num_gap_ack_blocks
= htons(num_gabs
);
775 sack
.num_dup_tsns
= htons(num_dup_tsns
);
778 + sizeof(struct sctp_gap_ack_block
) * num_gabs
779 + sizeof(__u32
) * num_dup_tsns
;
781 /* Create the chunk. */
782 retval
= sctp_make_control(asoc
, SCTP_CID_SACK
, 0, len
);
786 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
788 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
789 * HEARTBEAT ACK, etc.) to the same destination transport
790 * address from which it received the DATA or control chunk to
791 * which it is replying. This rule should also be followed if
792 * the endpoint is bundling DATA chunks together with the
795 * However, when acknowledging multiple DATA chunks received
796 * in packets from different source addresses in a single
797 * SACK, the SACK chunk may be transmitted to one of the
798 * destination transport addresses from which the DATA or
799 * control chunks being acknowledged were received.
801 * [BUG: We do not implement the following paragraph.
802 * Perhaps we should remember the last transport we used for a
803 * SACK and avoid that (if possible) if we have seen any
804 * duplicates. --piggy]
806 * When a receiver of a duplicate DATA chunk sends a SACK to a
807 * multi- homed endpoint it MAY be beneficial to vary the
808 * destination address and not use the source address of the
809 * DATA chunk. The reason being that receiving a duplicate
810 * from a multi-homed endpoint might indicate that the return
811 * path (as specified in the source address of the DATA chunk)
812 * for the SACK is broken.
814 * [Send to the address from which we last received a DATA chunk.]
816 retval
->transport
= asoc
->peer
.last_data_from
;
818 retval
->subh
.sack_hdr
=
819 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
821 /* Add the gap ack block information. */
823 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
826 /* Add the duplicate TSN information. */
828 aptr
->stats
.idupchunks
+= num_dup_tsns
;
829 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
830 sctp_tsnmap_get_dups(map
));
832 /* Once we have a sack generated, check to see what our sack
833 * generation is, if its 0, reset the transports to 0, and reset
834 * the association generation to 1
836 * The idea is that zero is never used as a valid generation for the
837 * association so no transport will match after a wrap event like this,
838 * Until the next sack
840 if (++aptr
->peer
.sack_generation
== 0) {
841 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
843 trans
->sack_generation
= 0;
844 aptr
->peer
.sack_generation
= 1;
850 /* Make a SHUTDOWN chunk. */
851 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
852 const struct sctp_chunk
*chunk
)
854 struct sctp_chunk
*retval
;
855 sctp_shutdownhdr_t shut
;
858 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
859 shut
.cum_tsn_ack
= htonl(ctsn
);
861 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN
, 0,
862 sizeof(sctp_shutdownhdr_t
));
866 retval
->subh
.shutdown_hdr
=
867 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
870 retval
->transport
= chunk
->transport
;
875 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
876 const struct sctp_chunk
*chunk
)
878 struct sctp_chunk
*retval
;
880 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0);
882 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
884 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
885 * HEARTBEAT ACK, * etc.) to the same destination transport
886 * address from which it * received the DATA or control chunk
887 * to which it is replying.
889 * [ACK back to where the SHUTDOWN came from.]
892 retval
->transport
= chunk
->transport
;
897 struct sctp_chunk
*sctp_make_shutdown_complete(
898 const struct sctp_association
*asoc
,
899 const struct sctp_chunk
*chunk
)
901 struct sctp_chunk
*retval
;
904 /* Set the T-bit if we have no association (vtag will be
907 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
909 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
, 0);
911 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
913 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
914 * HEARTBEAT ACK, * etc.) to the same destination transport
915 * address from which it * received the DATA or control chunk
916 * to which it is replying.
918 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
922 retval
->transport
= chunk
->transport
;
927 /* Create an ABORT. Note that we set the T bit if we have no
928 * association, except when responding to an INIT (sctpimpguide 2.41).
930 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
931 const struct sctp_chunk
*chunk
,
934 struct sctp_chunk
*retval
;
937 /* Set the T-bit if we have no association and 'chunk' is not
938 * an INIT (vtag will be reflected).
941 if (chunk
&& chunk
->chunk_hdr
&&
942 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
945 flags
= SCTP_CHUNK_FLAG_T
;
948 retval
= sctp_make_control(asoc
, SCTP_CID_ABORT
, flags
, hint
);
950 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
952 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
953 * HEARTBEAT ACK, * etc.) to the same destination transport
954 * address from which it * received the DATA or control chunk
955 * to which it is replying.
957 * [ABORT back to where the offender came from.]
960 retval
->transport
= chunk
->transport
;
965 /* Helper to create ABORT with a NO_USER_DATA error. */
966 struct sctp_chunk
*sctp_make_abort_no_data(
967 const struct sctp_association
*asoc
,
968 const struct sctp_chunk
*chunk
, __u32 tsn
)
970 struct sctp_chunk
*retval
;
973 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
979 /* Put the tsn back into network byte order. */
980 payload
= htonl(tsn
);
981 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
982 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
984 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
986 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
987 * HEARTBEAT ACK, * etc.) to the same destination transport
988 * address from which it * received the DATA or control chunk
989 * to which it is replying.
991 * [ABORT back to where the offender came from.]
994 retval
->transport
= chunk
->transport
;
1000 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1001 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
1002 const struct msghdr
*msg
,
1005 struct sctp_chunk
*retval
;
1006 void *payload
= NULL
;
1009 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
1014 /* Put the msg_iov together into payload. */
1015 payload
= kmalloc(paylen
, GFP_KERNEL
);
1019 err
= memcpy_fromiovec(payload
, msg
->msg_iov
, paylen
);
1024 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1025 sctp_addto_chunk(retval
, paylen
, payload
);
1035 sctp_chunk_free(retval
);
1041 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1044 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1048 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1050 target
= skb_put(chunk
->skb
, len
);
1053 memcpy(target
, data
, len
);
1055 memset(target
, 0, len
);
1057 /* Adjust the chunk length field. */
1058 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1059 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1064 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1065 struct sctp_chunk
*sctp_make_abort_violation(
1066 const struct sctp_association
*asoc
,
1067 const struct sctp_chunk
*chunk
,
1068 const __u8
*payload
,
1069 const size_t paylen
)
1071 struct sctp_chunk
*retval
;
1072 struct sctp_paramhdr phdr
;
1074 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1075 + sizeof(sctp_paramhdr_t
));
1079 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1080 + sizeof(sctp_paramhdr_t
));
1082 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1083 phdr
.length
= chunk
->chunk_hdr
->length
;
1084 sctp_addto_chunk(retval
, paylen
, payload
);
1085 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1091 struct sctp_chunk
*sctp_make_violation_paramlen(
1092 const struct sctp_association
*asoc
,
1093 const struct sctp_chunk
*chunk
,
1094 struct sctp_paramhdr
*param
)
1096 struct sctp_chunk
*retval
;
1097 static const char error
[] = "The following parameter had invalid length:";
1098 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1099 sizeof(sctp_paramhdr_t
);
1101 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1105 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1106 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1107 sctp_addto_chunk(retval
, sizeof(error
), error
);
1108 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1114 struct sctp_chunk
*sctp_make_violation_max_retrans(
1115 const struct sctp_association
*asoc
,
1116 const struct sctp_chunk
*chunk
)
1118 struct sctp_chunk
*retval
;
1119 static const char error
[] = "Association exceeded its max_retans count";
1120 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
);
1122 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1126 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1127 sctp_addto_chunk(retval
, sizeof(error
), error
);
1133 /* Make a HEARTBEAT chunk. */
1134 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1135 const struct sctp_transport
*transport
)
1137 struct sctp_chunk
*retval
;
1138 sctp_sender_hb_info_t hbinfo
;
1140 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT
, 0, sizeof(hbinfo
));
1145 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1146 hbinfo
.param_hdr
.length
= htons(sizeof(sctp_sender_hb_info_t
));
1147 hbinfo
.daddr
= transport
->ipaddr
;
1148 hbinfo
.sent_at
= jiffies
;
1149 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1151 /* Cast away the 'const', as this is just telling the chunk
1152 * what transport it belongs to.
1154 retval
->transport
= (struct sctp_transport
*) transport
;
1155 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1162 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1163 const struct sctp_chunk
*chunk
,
1164 const void *payload
, const size_t paylen
)
1166 struct sctp_chunk
*retval
;
1168 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
);
1172 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1174 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1176 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1177 * HEARTBEAT ACK, * etc.) to the same destination transport
1178 * address from which it * received the DATA or control chunk
1179 * to which it is replying.
1181 * [HBACK back to where the HEARTBEAT came from.]
1184 retval
->transport
= chunk
->transport
;
1190 /* Create an Operation Error chunk with the specified space reserved.
1191 * This routine can be used for containing multiple causes in the chunk.
1193 static struct sctp_chunk
*sctp_make_op_error_space(
1194 const struct sctp_association
*asoc
,
1195 const struct sctp_chunk
*chunk
,
1198 struct sctp_chunk
*retval
;
1200 retval
= sctp_make_control(asoc
, SCTP_CID_ERROR
, 0,
1201 sizeof(sctp_errhdr_t
) + size
);
1205 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1207 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1208 * HEARTBEAT ACK, etc.) to the same destination transport
1209 * address from which it received the DATA or control chunk
1210 * to which it is replying.
1214 retval
->transport
= chunk
->transport
;
1220 /* Create an Operation Error chunk of a fixed size,
1221 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1222 * This is a helper function to allocate an error chunk for
1223 * for those invalid parameter codes in which we may not want
1224 * to report all the errors, if the incoming chunk is large
1226 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1227 const struct sctp_association
*asoc
,
1228 const struct sctp_chunk
*chunk
)
1230 size_t size
= asoc
? asoc
->pathmtu
: 0;
1233 size
= SCTP_DEFAULT_MAXSEGMENT
;
1235 return sctp_make_op_error_space(asoc
, chunk
, size
);
1238 /* Create an Operation Error chunk. */
1239 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1240 const struct sctp_chunk
*chunk
,
1241 __be16 cause_code
, const void *payload
,
1242 size_t paylen
, size_t reserve_tail
)
1244 struct sctp_chunk
*retval
;
1246 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1250 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1251 sctp_addto_chunk(retval
, paylen
, payload
);
1253 sctp_addto_param(retval
, reserve_tail
, NULL
);
1259 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1261 struct sctp_chunk
*retval
;
1262 struct sctp_hmac
*hmac_desc
;
1263 struct sctp_authhdr auth_hdr
;
1266 /* Get the first hmac that the peer told us to use */
1267 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1268 if (unlikely(!hmac_desc
))
1271 retval
= sctp_make_control(asoc
, SCTP_CID_AUTH
, 0,
1272 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
));
1276 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1277 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1279 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1282 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1283 memset(hmac
, 0, hmac_desc
->hmac_len
);
1285 /* Adjust the chunk header to include the empty MAC */
1286 retval
->chunk_hdr
->length
=
1287 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1288 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1294 /********************************************************************
1295 * 2nd Level Abstractions
1296 ********************************************************************/
1298 /* Turn an skb into a chunk.
1299 * FIXME: Eventually move the structure directly inside the skb->cb[].
1301 * sctpimpguide-05.txt Section 2.8.2
1302 * M1) Each time a new DATA chunk is transmitted
1303 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1304 * 'TSN.Missing.Report' count will be used to determine missing chunks
1305 * and when to fast retransmit.
1308 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1309 const struct sctp_association
*asoc
,
1312 struct sctp_chunk
*retval
;
1314 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, GFP_ATOMIC
);
1319 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1321 INIT_LIST_HEAD(&retval
->list
);
1323 retval
->asoc
= (struct sctp_association
*)asoc
;
1324 retval
->singleton
= 1;
1326 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1328 /* Polish the bead hole. */
1329 INIT_LIST_HEAD(&retval
->transmitted_list
);
1330 INIT_LIST_HEAD(&retval
->frag_list
);
1331 SCTP_DBG_OBJCNT_INC(chunk
);
1332 atomic_set(&retval
->refcnt
, 1);
1338 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1339 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1340 union sctp_addr
*dest
)
1342 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1343 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1346 /* Extract the source address from a chunk. */
1347 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1349 /* If we have a known transport, use that. */
1350 if (chunk
->transport
) {
1351 return &chunk
->transport
->ipaddr
;
1353 /* Otherwise, extract it from the IP header. */
1354 return &chunk
->source
;
1358 /* Create a new chunk, setting the type and flags headers from the
1359 * arguments, reserving enough space for a 'paylen' byte payload.
1361 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1362 __u8 type
, __u8 flags
, int paylen
)
1364 struct sctp_chunk
*retval
;
1365 sctp_chunkhdr_t
*chunk_hdr
;
1366 struct sk_buff
*skb
;
1369 /* No need to allocate LL here, as this is only a chunk. */
1370 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
),
1375 /* Make room for the chunk header. */
1376 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1377 chunk_hdr
->type
= type
;
1378 chunk_hdr
->flags
= flags
;
1379 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1381 sk
= asoc
? asoc
->base
.sk
: NULL
;
1382 retval
= sctp_chunkify(skb
, asoc
, sk
);
1388 retval
->chunk_hdr
= chunk_hdr
;
1389 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1391 /* Determine if the chunk needs to be authenticated */
1392 if (sctp_auth_send_cid(type
, asoc
))
1400 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1401 __u8 flags
, int paylen
)
1403 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
);
1406 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1407 __u8 type
, __u8 flags
, int paylen
)
1409 struct sctp_chunk
*chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
);
1412 sctp_control_set_owner_w(chunk
);
1417 /* Release the memory occupied by a chunk. */
1418 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1420 BUG_ON(!list_empty(&chunk
->list
));
1421 list_del_init(&chunk
->transmitted_list
);
1423 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1424 dev_kfree_skb(chunk
->skb
);
1426 SCTP_DBG_OBJCNT_DEC(chunk
);
1427 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1430 /* Possibly, free the chunk. */
1431 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1433 /* Release our reference on the message tracker. */
1435 sctp_datamsg_put(chunk
->msg
);
1437 sctp_chunk_put(chunk
);
1440 /* Grab a reference to the chunk. */
1441 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1443 atomic_inc(&ch
->refcnt
);
1446 /* Release a reference to the chunk. */
1447 void sctp_chunk_put(struct sctp_chunk
*ch
)
1449 if (atomic_dec_and_test(&ch
->refcnt
))
1450 sctp_chunk_destroy(ch
);
1453 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1456 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1460 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1461 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1463 padding
= skb_put(chunk
->skb
, padlen
);
1464 target
= skb_put(chunk
->skb
, len
);
1466 memset(padding
, 0, padlen
);
1467 memcpy(target
, data
, len
);
1469 /* Adjust the chunk length field. */
1470 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1471 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1476 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1477 * space in the chunk
1479 void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1480 int len
, const void *data
)
1482 if (skb_tailroom(chunk
->skb
) >= len
)
1483 return sctp_addto_chunk(chunk
, len
, data
);
1488 /* Append bytes from user space to the end of a chunk. Will panic if
1489 * chunk is not big enough.
1490 * Returns a kernel err value.
1492 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int off
, int len
,
1498 /* Make room in chunk for data. */
1499 target
= skb_put(chunk
->skb
, len
);
1501 /* Copy data (whole iovec) into chunk */
1502 if ((err
= memcpy_fromiovecend(target
, data
, off
, len
)))
1505 /* Adjust the chunk length field. */
1506 chunk
->chunk_hdr
->length
=
1507 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1508 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1514 /* Helper function to assign a TSN if needed. This assumes that both
1515 * the data_hdr and association have already been assigned.
1517 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1519 struct sctp_datamsg
*msg
;
1520 struct sctp_chunk
*lchunk
;
1521 struct sctp_stream
*stream
;
1528 /* All fragments will be on the same stream */
1529 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1530 stream
= &chunk
->asoc
->ssnmap
->out
;
1532 /* Now assign the sequence number to the entire message.
1533 * All fragments must have the same stream sequence number.
1536 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1537 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1540 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1541 ssn
= sctp_ssn_next(stream
, sid
);
1543 ssn
= sctp_ssn_peek(stream
, sid
);
1546 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1547 lchunk
->has_ssn
= 1;
1551 /* Helper function to assign a TSN if needed. This assumes that both
1552 * the data_hdr and association have already been assigned.
1554 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1556 if (!chunk
->has_tsn
) {
1557 /* This is the last possible instant to
1560 chunk
->subh
.data_hdr
->tsn
=
1561 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1566 /* Create a CLOSED association to use with an incoming packet. */
1567 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1568 struct sctp_chunk
*chunk
,
1571 struct sctp_association
*asoc
;
1572 struct sk_buff
*skb
;
1576 /* Create the bare association. */
1577 scope
= sctp_scope(sctp_source(chunk
));
1578 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1583 /* Create an entry for the source address of the packet. */
1584 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1587 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1592 sctp_association_free(asoc
);
1596 /* Build a cookie representing asoc.
1597 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1599 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1600 const struct sctp_association
*asoc
,
1601 const struct sctp_chunk
*init_chunk
,
1603 const __u8
*raw_addrs
, int addrs_len
)
1605 sctp_cookie_param_t
*retval
;
1606 struct sctp_signed_cookie
*cookie
;
1607 struct scatterlist sg
;
1608 int headersize
, bodysize
;
1610 /* Header size is static data prior to the actual cookie, including
1613 headersize
= sizeof(sctp_paramhdr_t
) +
1614 (sizeof(struct sctp_signed_cookie
) -
1615 sizeof(struct sctp_cookie
));
1616 bodysize
= sizeof(struct sctp_cookie
)
1617 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1619 /* Pad out the cookie to a multiple to make the signature
1620 * functions simpler to write.
1622 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1623 bodysize
+= SCTP_COOKIE_MULTIPLE
1624 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1625 *cookie_len
= headersize
+ bodysize
;
1627 /* Clear this memory since we are sending this data structure
1628 * out on the network.
1630 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1634 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1636 /* Set up the parameter header. */
1637 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1638 retval
->p
.length
= htons(*cookie_len
);
1640 /* Copy the cookie part of the association itself. */
1641 cookie
->c
= asoc
->c
;
1642 /* Save the raw address list length in the cookie. */
1643 cookie
->c
.raw_addr_list_len
= addrs_len
;
1645 /* Remember PR-SCTP capability. */
1646 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1648 /* Save adaptation indication in the cookie. */
1649 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1651 /* Set an expiration time for the cookie. */
1652 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1655 /* Copy the peer's init packet. */
1656 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1657 ntohs(init_chunk
->chunk_hdr
->length
));
1659 /* Copy the raw local address list of the association. */
1660 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1661 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1663 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1664 struct hash_desc desc
;
1666 /* Sign the message. */
1667 sg_init_one(&sg
, &cookie
->c
, bodysize
);
1668 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1671 if (crypto_hash_setkey(desc
.tfm
, ep
->secret_key
,
1672 sizeof(ep
->secret_key
)) ||
1673 crypto_hash_digest(&desc
, &sg
, bodysize
, cookie
->signature
))
1686 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1687 struct sctp_association
*sctp_unpack_cookie(
1688 const struct sctp_endpoint
*ep
,
1689 const struct sctp_association
*asoc
,
1690 struct sctp_chunk
*chunk
, gfp_t gfp
,
1691 int *error
, struct sctp_chunk
**errp
)
1693 struct sctp_association
*retval
= NULL
;
1694 struct sctp_signed_cookie
*cookie
;
1695 struct sctp_cookie
*bear_cookie
;
1696 int headersize
, bodysize
, fixed_size
;
1697 __u8
*digest
= ep
->digest
;
1698 struct scatterlist sg
;
1701 struct sk_buff
*skb
= chunk
->skb
;
1703 struct hash_desc desc
;
1705 /* Header size is static data prior to the actual cookie, including
1708 headersize
= sizeof(sctp_chunkhdr_t
) +
1709 (sizeof(struct sctp_signed_cookie
) -
1710 sizeof(struct sctp_cookie
));
1711 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1712 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1714 /* Verify that the chunk looks like it even has a cookie.
1715 * There must be enough room for our cookie and our peer's
1718 len
= ntohs(chunk
->chunk_hdr
->length
);
1719 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1722 /* Verify that the cookie has been padded out. */
1723 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1726 /* Process the cookie. */
1727 cookie
= chunk
->subh
.cookie_hdr
;
1728 bear_cookie
= &cookie
->c
;
1730 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1733 /* Check the signature. */
1734 sg_init_one(&sg
, bear_cookie
, bodysize
);
1735 desc
.tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1738 memset(digest
, 0x00, SCTP_SIGNATURE_SIZE
);
1739 if (crypto_hash_setkey(desc
.tfm
, ep
->secret_key
,
1740 sizeof(ep
->secret_key
)) ||
1741 crypto_hash_digest(&desc
, &sg
, bodysize
, digest
)) {
1742 *error
= -SCTP_IERROR_NOMEM
;
1746 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1747 *error
= -SCTP_IERROR_BAD_SIG
;
1752 /* IG Section 2.35.2:
1753 * 3) Compare the port numbers and the verification tag contained
1754 * within the COOKIE ECHO chunk to the actual port numbers and the
1755 * verification tag within the SCTP common header of the received
1756 * packet. If these values do not match the packet MUST be silently
1759 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1760 *error
= -SCTP_IERROR_BAD_TAG
;
1764 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1765 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1766 *error
= -SCTP_IERROR_BAD_PORTS
;
1770 /* Check to see if the cookie is stale. If there is already
1771 * an association, there is no need to check cookie's expiration
1772 * for init collision case of lost COOKIE ACK.
1773 * If skb has been timestamped, then use the stamp, otherwise
1774 * use current time. This introduces a small possibility that
1775 * that a cookie may be considered expired, but his would only slow
1776 * down the new association establishment instead of every packet.
1778 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1779 kt
= skb_get_ktime(skb
);
1783 if (!asoc
&& ktime_compare(bear_cookie
->expiration
, kt
) < 0) {
1785 * Section 3.3.10.3 Stale Cookie Error (3)
1789 * Stale Cookie Error: Indicates the receipt of a valid State
1790 * Cookie that has expired.
1792 len
= ntohs(chunk
->chunk_hdr
->length
);
1793 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1795 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1796 __be32 n
= htonl(usecs
);
1798 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1800 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1801 *error
= -SCTP_IERROR_STALE_COOKIE
;
1803 *error
= -SCTP_IERROR_NOMEM
;
1808 /* Make a new base association. */
1809 scope
= sctp_scope(sctp_source(chunk
));
1810 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1812 *error
= -SCTP_IERROR_NOMEM
;
1816 /* Set up our peer's port number. */
1817 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1819 /* Populate the association from the cookie. */
1820 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1822 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1824 *error
= -SCTP_IERROR_NOMEM
;
1828 /* Also, add the destination address. */
1829 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1830 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1831 SCTP_ADDR_SRC
, GFP_ATOMIC
);
1834 retval
->next_tsn
= retval
->c
.initial_tsn
;
1835 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1836 retval
->addip_serial
= retval
->c
.initial_tsn
;
1837 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1838 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1839 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1841 /* The INIT stuff will be done by the side effects. */
1846 sctp_association_free(retval
);
1851 /* Yikes! The packet is either corrupt or deliberately
1854 *error
= -SCTP_IERROR_MALFORMED
;
1858 /********************************************************************
1859 * 3rd Level Abstractions
1860 ********************************************************************/
1862 struct __sctp_missing
{
1868 * Report a missing mandatory parameter.
1870 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1871 sctp_param_t paramtype
,
1872 struct sctp_chunk
*chunk
,
1873 struct sctp_chunk
**errp
)
1875 struct __sctp_missing report
;
1878 len
= WORD_ROUND(sizeof(report
));
1880 /* Make an ERROR chunk, preparing enough room for
1881 * returning multiple unknown parameters.
1884 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1887 report
.num_missing
= htonl(1);
1888 report
.type
= paramtype
;
1889 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1891 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1894 /* Stop processing this chunk. */
1898 /* Report an Invalid Mandatory Parameter. */
1899 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1900 struct sctp_chunk
*chunk
,
1901 struct sctp_chunk
**errp
)
1903 /* Invalid Mandatory Parameter Error has no payload. */
1906 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1909 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1911 /* Stop processing this chunk. */
1915 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1916 struct sctp_paramhdr
*param
,
1917 const struct sctp_chunk
*chunk
,
1918 struct sctp_chunk
**errp
)
1920 /* This is a fatal error. Any accumulated non-fatal errors are
1924 sctp_chunk_free(*errp
);
1926 /* Create an error chunk and fill it in with our payload. */
1927 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1933 /* Do not attempt to handle the HOST_NAME parm. However, do
1934 * send back an indicator to the peer.
1936 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1937 union sctp_params param
,
1938 struct sctp_chunk
*chunk
,
1939 struct sctp_chunk
**errp
)
1941 __u16 len
= ntohs(param
.p
->length
);
1943 /* Processing of the HOST_NAME parameter will generate an
1944 * ABORT. If we've accumulated any non-fatal errors, they
1945 * would be unrecognized parameters and we should not include
1946 * them in the ABORT.
1949 sctp_chunk_free(*errp
);
1951 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1954 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1955 sctp_addto_chunk(*errp
, len
, param
.v
);
1958 /* Stop processing this chunk. */
1962 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1964 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1966 int have_asconf
= 0;
1969 for (i
= 0; i
< num_ext
; i
++) {
1970 switch (param
.ext
->chunks
[i
]) {
1974 case SCTP_CID_ASCONF
:
1975 case SCTP_CID_ASCONF_ACK
:
1981 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1982 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1983 * only if ADD-IP is turned on and we are not backward-compatible
1986 if (net
->sctp
.addip_noauth
)
1989 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
1995 static void sctp_process_ext_param(struct sctp_association
*asoc
,
1996 union sctp_params param
)
1998 struct net
*net
= sock_net(asoc
->base
.sk
);
1999 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2002 for (i
= 0; i
< num_ext
; i
++) {
2003 switch (param
.ext
->chunks
[i
]) {
2004 case SCTP_CID_FWD_TSN
:
2005 if (net
->sctp
.prsctp_enable
&&
2006 !asoc
->peer
.prsctp_capable
)
2007 asoc
->peer
.prsctp_capable
= 1;
2010 /* if the peer reports AUTH, assume that he
2013 if (net
->sctp
.auth_enable
)
2014 asoc
->peer
.auth_capable
= 1;
2016 case SCTP_CID_ASCONF
:
2017 case SCTP_CID_ASCONF_ACK
:
2018 if (net
->sctp
.addip_enable
)
2019 asoc
->peer
.asconf_capable
= 1;
2027 /* RFC 3.2.1 & the Implementers Guide 2.2.
2029 * The Parameter Types are encoded such that the
2030 * highest-order two bits specify the action that must be
2031 * taken if the processing endpoint does not recognize the
2034 * 00 - Stop processing this parameter; do not process any further
2035 * parameters within this chunk
2037 * 01 - Stop processing this parameter, do not process any further
2038 * parameters within this chunk, and report the unrecognized
2039 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2041 * 10 - Skip this parameter and continue processing.
2043 * 11 - Skip this parameter and continue processing but
2044 * report the unrecognized parameter in an
2045 * 'Unrecognized Parameter' ERROR chunk.
2048 * SCTP_IERROR_NO_ERROR - continue with the chunk
2049 * SCTP_IERROR_ERROR - stop and report an error.
2050 * SCTP_IERROR_NOMEME - out of memory.
2052 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2053 union sctp_params param
,
2054 struct sctp_chunk
*chunk
,
2055 struct sctp_chunk
**errp
)
2057 int retval
= SCTP_IERROR_NO_ERROR
;
2059 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2060 case SCTP_PARAM_ACTION_DISCARD
:
2061 retval
= SCTP_IERROR_ERROR
;
2063 case SCTP_PARAM_ACTION_SKIP
:
2065 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2066 retval
= SCTP_IERROR_ERROR
;
2068 case SCTP_PARAM_ACTION_SKIP_ERR
:
2069 /* Make an ERROR chunk, preparing enough room for
2070 * returning multiple unknown parameters.
2073 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2076 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2077 WORD_ROUND(ntohs(param
.p
->length
))))
2078 sctp_addto_chunk_fixed(*errp
,
2079 WORD_ROUND(ntohs(param
.p
->length
)),
2082 /* If there is no memory for generating the ERROR
2083 * report as specified, an ABORT will be triggered
2084 * to the peer and the association won't be
2087 retval
= SCTP_IERROR_NOMEM
;
2097 /* Verify variable length parameters
2099 * SCTP_IERROR_ABORT - trigger an ABORT
2100 * SCTP_IERROR_NOMEM - out of memory (abort)
2101 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2102 * SCTP_IERROR_NO_ERROR - continue with the chunk
2104 static sctp_ierror_t
sctp_verify_param(struct net
*net
,
2105 const struct sctp_association
*asoc
,
2106 union sctp_params param
,
2108 struct sctp_chunk
*chunk
,
2109 struct sctp_chunk
**err_chunk
)
2111 struct sctp_hmac_algo_param
*hmacs
;
2112 int retval
= SCTP_IERROR_NO_ERROR
;
2113 __u16 n_elt
, id
= 0;
2116 /* FIXME - This routine is not looking at each parameter per the
2117 * chunk type, i.e., unrecognized parameters should be further
2118 * identified based on the chunk id.
2121 switch (param
.p
->type
) {
2122 case SCTP_PARAM_IPV4_ADDRESS
:
2123 case SCTP_PARAM_IPV6_ADDRESS
:
2124 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2125 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2126 case SCTP_PARAM_STATE_COOKIE
:
2127 case SCTP_PARAM_HEARTBEAT_INFO
:
2128 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2129 case SCTP_PARAM_ECN_CAPABLE
:
2130 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2133 case SCTP_PARAM_SUPPORTED_EXT
:
2134 if (!sctp_verify_ext_param(net
, param
))
2135 return SCTP_IERROR_ABORT
;
2138 case SCTP_PARAM_SET_PRIMARY
:
2139 if (net
->sctp
.addip_enable
)
2143 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2144 /* Tell the peer, we won't support this param. */
2145 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2146 retval
= SCTP_IERROR_ABORT
;
2149 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2150 if (net
->sctp
.prsctp_enable
)
2154 case SCTP_PARAM_RANDOM
:
2155 if (!net
->sctp
.auth_enable
)
2158 /* SCTP-AUTH: Secion 6.1
2159 * If the random number is not 32 byte long the association
2160 * MUST be aborted. The ABORT chunk SHOULD contain the error
2161 * cause 'Protocol Violation'.
2163 if (SCTP_AUTH_RANDOM_LENGTH
!=
2164 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2165 sctp_process_inv_paramlength(asoc
, param
.p
,
2167 retval
= SCTP_IERROR_ABORT
;
2171 case SCTP_PARAM_CHUNKS
:
2172 if (!net
->sctp
.auth_enable
)
2175 /* SCTP-AUTH: Section 3.2
2176 * The CHUNKS parameter MUST be included once in the INIT or
2177 * INIT-ACK chunk if the sender wants to receive authenticated
2178 * chunks. Its maximum length is 260 bytes.
2180 if (260 < ntohs(param
.p
->length
)) {
2181 sctp_process_inv_paramlength(asoc
, param
.p
,
2183 retval
= SCTP_IERROR_ABORT
;
2187 case SCTP_PARAM_HMAC_ALGO
:
2188 if (!net
->sctp
.auth_enable
)
2191 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2192 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2194 /* SCTP-AUTH: Section 6.1
2195 * The HMAC algorithm based on SHA-1 MUST be supported and
2196 * included in the HMAC-ALGO parameter.
2198 for (i
= 0; i
< n_elt
; i
++) {
2199 id
= ntohs(hmacs
->hmac_ids
[i
]);
2201 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2205 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2206 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2208 retval
= SCTP_IERROR_ABORT
;
2213 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2214 __func__
, ntohs(param
.p
->type
), cid
);
2216 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2222 /* Verify the INIT packet before we process it. */
2223 int sctp_verify_init(struct net
*net
, const struct sctp_association
*asoc
,
2225 sctp_init_chunk_t
*peer_init
,
2226 struct sctp_chunk
*chunk
,
2227 struct sctp_chunk
**errp
)
2229 union sctp_params param
;
2230 bool has_cookie
= false;
2233 /* Check for missing mandatory parameters. Note: Initial TSN is
2234 * also mandatory, but is not checked here since the valid range
2235 * is 0..2**32-1. RFC4960, section 3.3.3.
2237 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2238 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2239 peer_init
->init_hdr
.init_tag
== 0 ||
2240 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2241 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2243 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2244 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2248 /* There is a possibility that a parameter length was bad and
2249 * in that case we would have stoped walking the parameters.
2250 * The current param.p would point at the bad one.
2251 * Current consensus on the mailing list is to generate a PROTOCOL
2252 * VIOLATION error. We build the ERROR chunk here and let the normal
2253 * error handling code build and send the packet.
2255 if (param
.v
!= (void*)chunk
->chunk_end
)
2256 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2258 /* The only missing mandatory param possible today is
2259 * the state cookie for an INIT-ACK chunk.
2261 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2262 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2265 /* Verify all the variable length parameters */
2266 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2268 result
= sctp_verify_param(net
, asoc
, param
, cid
, chunk
, errp
);
2270 case SCTP_IERROR_ABORT
:
2271 case SCTP_IERROR_NOMEM
:
2273 case SCTP_IERROR_ERROR
:
2275 case SCTP_IERROR_NO_ERROR
:
2280 } /* for (loop through all parameters) */
2285 /* Unpack the parameters in an INIT packet into an association.
2286 * Returns 0 on failure, else success.
2287 * FIXME: This is an association method.
2289 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2290 const union sctp_addr
*peer_addr
,
2291 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2293 struct net
*net
= sock_net(asoc
->base
.sk
);
2294 union sctp_params param
;
2295 struct sctp_transport
*transport
;
2296 struct list_head
*pos
, *temp
;
2298 union sctp_addr addr
;
2302 /* We must include the address that the INIT packet came from.
2303 * This is the only address that matters for an INIT packet.
2304 * When processing a COOKIE ECHO, we retrieve the from address
2305 * of the INIT from the cookie.
2308 /* This implementation defaults to making the first transport
2309 * added as the primary transport. The source address seems to
2310 * be a a better choice than any of the embedded addresses.
2312 if(!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2315 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2318 /* Process the initialization parameters. */
2319 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2320 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2321 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2322 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2323 af
->from_addr_param(&addr
, param
.addr
,
2324 chunk
->sctp_hdr
->source
, 0);
2325 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2329 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2333 /* source address of chunk may not match any valid address */
2337 /* AUTH: After processing the parameters, make sure that we
2338 * have all the required info to potentially do authentications.
2340 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2341 !asoc
->peer
.peer_hmacs
))
2342 asoc
->peer
.auth_capable
= 0;
2344 /* In a non-backward compatible mode, if the peer claims
2345 * support for ADD-IP but not AUTH, the ADD-IP spec states
2346 * that we MUST ABORT the association. Section 6. The section
2347 * also give us an option to silently ignore the packet, which
2348 * is what we'll do here.
2350 if (!net
->sctp
.addip_noauth
&&
2351 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2352 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2354 SCTP_PARAM_SET_PRIMARY
);
2355 asoc
->peer
.asconf_capable
= 0;
2359 /* Walk list of transports, removing transports in the UNKNOWN state. */
2360 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2361 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2362 if (transport
->state
== SCTP_UNKNOWN
) {
2363 sctp_assoc_rm_peer(asoc
, transport
);
2367 /* The fixed INIT headers are always in network byte
2370 asoc
->peer
.i
.init_tag
=
2371 ntohl(peer_init
->init_hdr
.init_tag
);
2372 asoc
->peer
.i
.a_rwnd
=
2373 ntohl(peer_init
->init_hdr
.a_rwnd
);
2374 asoc
->peer
.i
.num_outbound_streams
=
2375 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2376 asoc
->peer
.i
.num_inbound_streams
=
2377 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2378 asoc
->peer
.i
.initial_tsn
=
2379 ntohl(peer_init
->init_hdr
.initial_tsn
);
2381 /* Apply the upper bounds for output streams based on peer's
2382 * number of inbound streams.
2384 if (asoc
->c
.sinit_num_ostreams
>
2385 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2386 asoc
->c
.sinit_num_ostreams
=
2387 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2390 if (asoc
->c
.sinit_max_instreams
>
2391 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2392 asoc
->c
.sinit_max_instreams
=
2393 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2396 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2397 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2399 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2400 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2402 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2403 cookie
= asoc
->peer
.cookie
;
2405 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2406 if (!asoc
->peer
.cookie
)
2410 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2411 * high (for example, implementations MAY use the size of the receiver
2412 * advertised window).
2414 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2416 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2419 /* Set up the TSN tracking pieces. */
2420 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2421 asoc
->peer
.i
.initial_tsn
, gfp
))
2424 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2426 * The stream sequence number in all the streams shall start
2427 * from 0 when the association is established. Also, when the
2428 * stream sequence number reaches the value 65535 the next
2429 * stream sequence number shall be set to 0.
2432 /* Allocate storage for the negotiated streams if it is not a temporary
2438 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2439 asoc
->c
.sinit_num_ostreams
, gfp
);
2443 error
= sctp_assoc_set_id(asoc
, gfp
);
2448 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2450 * When an endpoint has an ASCONF signaled change to be sent to the
2451 * remote endpoint it should do the following:
2453 * A2) A serial number should be assigned to the Chunk. The serial
2454 * number should be a monotonically increasing number. All serial
2455 * numbers are defined to be initialized at the start of the
2456 * association to the same value as the Initial TSN.
2458 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2462 /* Release the transport structures. */
2463 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2464 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2465 if (transport
->state
!= SCTP_ACTIVE
)
2466 sctp_assoc_rm_peer(asoc
, transport
);
2474 /* Update asoc with the option described in param.
2476 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2478 * asoc is the association to update.
2479 * param is the variable length parameter to use for update.
2480 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2481 * If the current packet is an INIT we want to minimize the amount of
2482 * work we do. In particular, we should not build transport
2483 * structures for the addresses.
2485 static int sctp_process_param(struct sctp_association
*asoc
,
2486 union sctp_params param
,
2487 const union sctp_addr
*peer_addr
,
2490 struct net
*net
= sock_net(asoc
->base
.sk
);
2491 union sctp_addr addr
;
2498 union sctp_addr_param
*addr_param
;
2499 struct sctp_transport
*t
;
2501 /* We maintain all INIT parameters in network byte order all the
2502 * time. This allows us to not worry about whether the parameters
2503 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2505 switch (param
.p
->type
) {
2506 case SCTP_PARAM_IPV6_ADDRESS
:
2507 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2511 case SCTP_PARAM_IPV4_ADDRESS
:
2512 /* v4 addresses are not allowed on v6-only socket */
2513 if (ipv6_only_sock(asoc
->base
.sk
))
2516 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2517 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2518 scope
= sctp_scope(peer_addr
);
2519 if (sctp_in_scope(net
, &addr
, scope
))
2520 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2524 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2525 if (!net
->sctp
.cookie_preserve_enable
)
2528 stale
= ntohl(param
.life
->lifespan_increment
);
2530 /* Suggested Cookie Life span increment's unit is msec,
2533 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2536 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2537 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2540 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2541 /* Turn off the default values first so we'll know which
2542 * ones are really set by the peer.
2544 asoc
->peer
.ipv4_address
= 0;
2545 asoc
->peer
.ipv6_address
= 0;
2547 /* Assume that peer supports the address family
2548 * by which it sends a packet.
2550 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2551 asoc
->peer
.ipv6_address
= 1;
2552 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2553 asoc
->peer
.ipv4_address
= 1;
2555 /* Cycle through address types; avoid divide by 0. */
2556 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2558 sat
/= sizeof(__u16
);
2560 for (i
= 0; i
< sat
; ++i
) {
2561 switch (param
.sat
->types
[i
]) {
2562 case SCTP_PARAM_IPV4_ADDRESS
:
2563 asoc
->peer
.ipv4_address
= 1;
2566 case SCTP_PARAM_IPV6_ADDRESS
:
2567 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2568 asoc
->peer
.ipv6_address
= 1;
2571 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2572 asoc
->peer
.hostname_address
= 1;
2575 default: /* Just ignore anything else. */
2581 case SCTP_PARAM_STATE_COOKIE
:
2582 asoc
->peer
.cookie_len
=
2583 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2584 asoc
->peer
.cookie
= param
.cookie
->body
;
2587 case SCTP_PARAM_HEARTBEAT_INFO
:
2588 /* Would be odd to receive, but it causes no problems. */
2591 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2592 /* Rejected during verify stage. */
2595 case SCTP_PARAM_ECN_CAPABLE
:
2596 asoc
->peer
.ecn_capable
= 1;
2599 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2600 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2603 case SCTP_PARAM_SET_PRIMARY
:
2604 if (!net
->sctp
.addip_enable
)
2607 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2609 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2610 af
->from_addr_param(&addr
, addr_param
,
2611 htons(asoc
->peer
.port
), 0);
2613 /* if the address is invalid, we can't process it.
2614 * XXX: see spec for what to do.
2616 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2619 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2623 sctp_assoc_set_primary(asoc
, t
);
2626 case SCTP_PARAM_SUPPORTED_EXT
:
2627 sctp_process_ext_param(asoc
, param
);
2630 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2631 if (net
->sctp
.prsctp_enable
) {
2632 asoc
->peer
.prsctp_capable
= 1;
2638 case SCTP_PARAM_RANDOM
:
2639 if (!net
->sctp
.auth_enable
)
2642 /* Save peer's random parameter */
2643 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2644 ntohs(param
.p
->length
), gfp
);
2645 if (!asoc
->peer
.peer_random
) {
2651 case SCTP_PARAM_HMAC_ALGO
:
2652 if (!net
->sctp
.auth_enable
)
2655 /* Save peer's HMAC list */
2656 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2657 ntohs(param
.p
->length
), gfp
);
2658 if (!asoc
->peer
.peer_hmacs
) {
2663 /* Set the default HMAC the peer requested*/
2664 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2667 case SCTP_PARAM_CHUNKS
:
2668 if (!net
->sctp
.auth_enable
)
2671 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2672 ntohs(param
.p
->length
), gfp
);
2673 if (!asoc
->peer
.peer_chunks
)
2678 /* Any unrecognized parameters should have been caught
2679 * and handled by sctp_verify_param() which should be
2680 * called prior to this routine. Simply log the error
2683 pr_debug("%s: ignoring param:%d for association:%p.\n",
2684 __func__
, ntohs(param
.p
->type
), asoc
);
2691 /* Select a new verification tag. */
2692 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2694 /* I believe that this random number generator complies with RFC1750.
2695 * A tag of 0 is reserved for special cases (e.g. INIT).
2700 get_random_bytes(&x
, sizeof(__u32
));
2706 /* Select an initial TSN to send during startup. */
2707 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2711 get_random_bytes(&retval
, sizeof(__u32
));
2716 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2718 * 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
2719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2720 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2723 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2724 * | Address Parameter |
2725 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2726 * | ASCONF Parameter #1 |
2727 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2732 * | ASCONF Parameter #N |
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * Address Parameter and other parameter will not be wrapped in this function
2737 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2738 union sctp_addr
*addr
,
2741 sctp_addiphdr_t asconf
;
2742 struct sctp_chunk
*retval
;
2743 int length
= sizeof(asconf
) + vparam_len
;
2744 union sctp_addr_param addrparam
;
2746 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2748 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2753 /* Create the chunk. */
2754 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
);
2758 asconf
.serial
= htonl(asoc
->addip_serial
++);
2760 retval
->subh
.addip_hdr
=
2761 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2762 retval
->param_hdr
.v
=
2763 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2769 * 3.2.1 Add IP Address
2771 * 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
2772 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2773 * | Type = 0xC001 | Length = Variable |
2774 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2775 * | ASCONF-Request Correlation ID |
2776 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2777 * | Address Parameter |
2778 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2780 * 3.2.2 Delete 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 = 0xC002 | Length = Variable |
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | ASCONF-Request Correlation ID |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | Address Parameter |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2792 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2793 union sctp_addr
*laddr
,
2794 struct sockaddr
*addrs
,
2798 sctp_addip_param_t param
;
2799 struct sctp_chunk
*retval
;
2800 union sctp_addr_param addr_param
;
2801 union sctp_addr
*addr
;
2804 int paramlen
= sizeof(param
);
2805 int addr_param_len
= 0;
2810 /* Get total length of all the address parameters. */
2812 for (i
= 0; i
< addrcnt
; i
++) {
2814 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2815 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2817 totallen
+= paramlen
;
2818 totallen
+= addr_param_len
;
2820 addr_buf
+= af
->sockaddr_len
;
2821 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2822 /* reuse the parameter length from the same scope one */
2823 totallen
+= paramlen
;
2824 totallen
+= addr_param_len
;
2827 pr_debug("%s: picked same-scope del_pending addr, "
2828 "totallen for all addresses is %d\n",
2829 __func__
, totallen
);
2833 /* Create an asconf chunk with the required length. */
2834 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2838 /* Add the address parameters to the asconf chunk. */
2840 for (i
= 0; i
< addrcnt
; i
++) {
2842 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2843 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2844 param
.param_hdr
.type
= flags
;
2845 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2848 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2849 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2851 addr_buf
+= af
->sockaddr_len
;
2853 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2854 addr
= asoc
->asconf_addr_del_pending
;
2855 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2856 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2857 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2858 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2861 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2862 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2868 * 3.2.4 Set Primary IP Address
2870 * 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
2871 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2872 * | Type =0xC004 | Length = Variable |
2873 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2874 * | ASCONF-Request Correlation ID |
2875 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2876 * | Address Parameter |
2877 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2879 * Create an ASCONF chunk with Set Primary IP address parameter.
2881 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2882 union sctp_addr
*addr
)
2884 sctp_addip_param_t param
;
2885 struct sctp_chunk
*retval
;
2886 int len
= sizeof(param
);
2887 union sctp_addr_param addrparam
;
2889 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2891 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2896 /* Create the chunk and make asconf header. */
2897 retval
= sctp_make_asconf(asoc
, addr
, len
);
2901 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2902 param
.param_hdr
.length
= htons(len
);
2905 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2906 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2911 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2913 * 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
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | Type = 0x80 | Chunk Flags | Chunk Length |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2919 * | ASCONF Parameter Response#1 |
2920 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2924 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2925 * | ASCONF Parameter Response#N |
2926 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2928 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2930 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2931 __u32 serial
, int vparam_len
)
2933 sctp_addiphdr_t asconf
;
2934 struct sctp_chunk
*retval
;
2935 int length
= sizeof(asconf
) + vparam_len
;
2937 /* Create the chunk. */
2938 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
);
2942 asconf
.serial
= htonl(serial
);
2944 retval
->subh
.addip_hdr
=
2945 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2950 /* Add response parameters to an ASCONF_ACK chunk. */
2951 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2952 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2954 sctp_addip_param_t ack_param
;
2955 sctp_errhdr_t err_param
;
2956 int asconf_param_len
= 0;
2957 int err_param_len
= 0;
2958 __be16 response_type
;
2960 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2961 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2963 response_type
= SCTP_PARAM_ERR_CAUSE
;
2964 err_param_len
= sizeof(err_param
);
2967 ntohs(asconf_param
->param_hdr
.length
);
2970 /* Add Success Indication or Error Cause Indication parameter. */
2971 ack_param
.param_hdr
.type
= response_type
;
2972 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2975 ack_param
.crr_id
= crr_id
;
2976 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2978 if (SCTP_ERROR_NO_ERROR
== err_code
)
2981 /* Add Error Cause parameter. */
2982 err_param
.cause
= err_code
;
2983 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2984 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2986 /* Add the failed TLV copied from ASCONF chunk. */
2988 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
2991 /* Process a asconf parameter. */
2992 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
2993 struct sctp_chunk
*asconf
,
2994 sctp_addip_param_t
*asconf_param
)
2996 struct sctp_transport
*peer
;
2998 union sctp_addr addr
;
2999 union sctp_addr_param
*addr_param
;
3001 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3003 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3004 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3005 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3006 return SCTP_ERROR_UNKNOWN_PARAM
;
3008 switch (addr_param
->p
.type
) {
3009 case SCTP_PARAM_IPV6_ADDRESS
:
3010 if (!asoc
->peer
.ipv6_address
)
3011 return SCTP_ERROR_DNS_FAILED
;
3013 case SCTP_PARAM_IPV4_ADDRESS
:
3014 if (!asoc
->peer
.ipv4_address
)
3015 return SCTP_ERROR_DNS_FAILED
;
3018 return SCTP_ERROR_DNS_FAILED
;
3021 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3023 return SCTP_ERROR_DNS_FAILED
;
3025 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3027 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3028 * or multicast address.
3029 * (note: wildcard is permitted and requires special handling so
3030 * make sure we check for that)
3032 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3033 return SCTP_ERROR_DNS_FAILED
;
3035 switch (asconf_param
->param_hdr
.type
) {
3036 case SCTP_PARAM_ADD_IP
:
3038 * If the address 0.0.0.0 or ::0 is provided, the source
3039 * address of the packet MUST be added.
3041 if (af
->is_any(&addr
))
3042 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3044 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3045 * request and does not have the local resources to add this
3046 * new address to the association, it MUST return an Error
3047 * Cause TLV set to the new error code 'Operation Refused
3048 * Due to Resource Shortage'.
3051 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3053 return SCTP_ERROR_RSRC_LOW
;
3055 /* Start the heartbeat timer. */
3056 if (!mod_timer(&peer
->hb_timer
, sctp_transport_timeout(peer
)))
3057 sctp_transport_hold(peer
);
3058 asoc
->new_transport
= peer
;
3060 case SCTP_PARAM_DEL_IP
:
3061 /* ADDIP 4.3 D7) If a request is received to delete the
3062 * last remaining IP address of a peer endpoint, the receiver
3063 * MUST send an Error Cause TLV with the error cause set to the
3064 * new error code 'Request to Delete Last Remaining IP Address'.
3066 if (asoc
->peer
.transport_count
== 1)
3067 return SCTP_ERROR_DEL_LAST_IP
;
3069 /* ADDIP 4.3 D8) If a request is received to delete an IP
3070 * address which is also the source address of the IP packet
3071 * which contained the ASCONF chunk, the receiver MUST reject
3072 * this request. To reject the request the receiver MUST send
3073 * an Error Cause TLV set to the new error code 'Request to
3074 * Delete Source IP Address'
3076 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3077 return SCTP_ERROR_DEL_SRC_IP
;
3080 * If the address 0.0.0.0 or ::0 is provided, all
3081 * addresses of the peer except the source address of the
3082 * packet MUST be deleted.
3084 if (af
->is_any(&addr
)) {
3085 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3086 sctp_assoc_del_nonprimary_peers(asoc
,
3089 sctp_assoc_del_peer(asoc
, &addr
);
3091 case SCTP_PARAM_SET_PRIMARY
:
3092 /* ADDIP Section 4.2.4
3093 * If the address 0.0.0.0 or ::0 is provided, the receiver
3094 * MAY mark the source address of the packet as its
3097 if (af
->is_any(&addr
))
3098 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3100 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3102 return SCTP_ERROR_DNS_FAILED
;
3104 sctp_assoc_set_primary(asoc
, peer
);
3108 return SCTP_ERROR_NO_ERROR
;
3111 /* Verify the ASCONF packet before we process it. */
3112 int sctp_verify_asconf(const struct sctp_association
*asoc
,
3113 struct sctp_paramhdr
*param_hdr
, void *chunk_end
,
3114 struct sctp_paramhdr
**errp
) {
3115 sctp_addip_param_t
*asconf_param
;
3116 union sctp_params param
;
3119 param
.v
= (sctp_paramhdr_t
*) param_hdr
;
3120 while (param
.v
<= chunk_end
- sizeof(sctp_paramhdr_t
)) {
3121 length
= ntohs(param
.p
->length
);
3124 if (param
.v
> chunk_end
- length
||
3125 length
< sizeof(sctp_paramhdr_t
))
3128 switch (param
.p
->type
) {
3129 case SCTP_PARAM_ADD_IP
:
3130 case SCTP_PARAM_DEL_IP
:
3131 case SCTP_PARAM_SET_PRIMARY
:
3132 asconf_param
= (sctp_addip_param_t
*)param
.v
;
3133 plen
= ntohs(asconf_param
->param_hdr
.length
);
3134 if (plen
< sizeof(sctp_addip_param_t
) +
3135 sizeof(sctp_paramhdr_t
))
3138 case SCTP_PARAM_SUCCESS_REPORT
:
3139 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3140 if (length
!= sizeof(sctp_addip_param_t
))
3148 param
.v
+= WORD_ROUND(length
);
3151 if (param
.v
!= chunk_end
)
3157 /* Process an incoming ASCONF chunk with the next expected serial no. and
3158 * return an ASCONF_ACK chunk to be sent in response.
3160 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3161 struct sctp_chunk
*asconf
)
3163 sctp_addiphdr_t
*hdr
;
3164 union sctp_addr_param
*addr_param
;
3165 sctp_addip_param_t
*asconf_param
;
3166 struct sctp_chunk
*asconf_ack
;
3172 int all_param_pass
= 1;
3174 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3175 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3176 serial
= ntohl(hdr
->serial
);
3178 /* Skip the addiphdr and store a pointer to address parameter. */
3179 length
= sizeof(sctp_addiphdr_t
);
3180 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3181 chunk_len
-= length
;
3183 /* Skip the address parameter and store a pointer to the first
3186 length
= ntohs(addr_param
->p
.length
);
3187 asconf_param
= (void *)addr_param
+ length
;
3188 chunk_len
-= length
;
3190 /* create an ASCONF_ACK chunk.
3191 * Based on the definitions of parameters, we know that the size of
3192 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3195 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3199 /* Process the TLVs contained within the ASCONF chunk. */
3200 while (chunk_len
> 0) {
3201 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3204 * If an error response is received for a TLV parameter,
3205 * all TLVs with no response before the failed TLV are
3206 * considered successful if not reported. All TLVs after
3207 * the failed response are considered unsuccessful unless
3208 * a specific success indication is present for the parameter.
3210 if (SCTP_ERROR_NO_ERROR
!= err_code
)
3213 if (!all_param_pass
)
3214 sctp_add_asconf_response(asconf_ack
,
3215 asconf_param
->crr_id
, err_code
,
3218 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3219 * an IP address sends an 'Out of Resource' in its response, it
3220 * MUST also fail any subsequent add or delete requests bundled
3223 if (SCTP_ERROR_RSRC_LOW
== err_code
)
3226 /* Move to the next ASCONF param. */
3227 length
= ntohs(asconf_param
->param_hdr
.length
);
3228 asconf_param
= (void *)asconf_param
+ length
;
3229 chunk_len
-= length
;
3233 asoc
->peer
.addip_serial
++;
3235 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3236 * after freeing the reference to old asconf ack if any.
3239 sctp_chunk_hold(asconf_ack
);
3240 list_add_tail(&asconf_ack
->transmitted_list
,
3241 &asoc
->asconf_ack_list
);
3247 /* Process a asconf parameter that is successfully acked. */
3248 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3249 sctp_addip_param_t
*asconf_param
)
3252 union sctp_addr addr
;
3253 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3254 union sctp_addr_param
*addr_param
;
3255 struct sctp_transport
*transport
;
3256 struct sctp_sockaddr_entry
*saddr
;
3258 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3260 /* We have checked the packet before, so we do not check again. */
3261 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3262 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3264 switch (asconf_param
->param_hdr
.type
) {
3265 case SCTP_PARAM_ADD_IP
:
3266 /* This is always done in BH context with a socket lock
3267 * held, so the list can not change.
3270 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3271 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3272 saddr
->state
= SCTP_ADDR_SRC
;
3275 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3277 dst_release(transport
->dst
);
3278 transport
->dst
= NULL
;
3281 case SCTP_PARAM_DEL_IP
:
3283 sctp_del_bind_addr(bp
, &addr
);
3284 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3285 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3286 kfree(asoc
->asconf_addr_del_pending
);
3287 asoc
->asconf_addr_del_pending
= NULL
;
3290 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3292 dst_release(transport
->dst
);
3293 transport
->dst
= NULL
;
3301 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3302 * for the given asconf parameter. If there is no response for this parameter,
3303 * return the error code based on the third argument 'no_err'.
3305 * A7) If an error response is received for a TLV parameter, all TLVs with no
3306 * response before the failed TLV are considered successful if not reported.
3307 * All TLVs after the failed response are considered unsuccessful unless a
3308 * specific success indication is present for the parameter.
3310 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3311 sctp_addip_param_t
*asconf_param
,
3314 sctp_addip_param_t
*asconf_ack_param
;
3315 sctp_errhdr_t
*err_param
;
3321 err_code
= SCTP_ERROR_NO_ERROR
;
3323 err_code
= SCTP_ERROR_REQ_REFUSED
;
3325 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3326 sizeof(sctp_chunkhdr_t
);
3328 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3329 * the first asconf_ack parameter.
3331 length
= sizeof(sctp_addiphdr_t
);
3332 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3334 asconf_ack_len
-= length
;
3336 while (asconf_ack_len
> 0) {
3337 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3338 switch(asconf_ack_param
->param_hdr
.type
) {
3339 case SCTP_PARAM_SUCCESS_REPORT
:
3340 return SCTP_ERROR_NO_ERROR
;
3341 case SCTP_PARAM_ERR_CAUSE
:
3342 length
= sizeof(sctp_addip_param_t
);
3343 err_param
= (void *)asconf_ack_param
+ length
;
3344 asconf_ack_len
-= length
;
3345 if (asconf_ack_len
> 0)
3346 return err_param
->cause
;
3348 return SCTP_ERROR_INV_PARAM
;
3351 return SCTP_ERROR_INV_PARAM
;
3355 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3356 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3357 asconf_ack_len
-= length
;
3363 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3364 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3365 struct sctp_chunk
*asconf_ack
)
3367 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3368 union sctp_addr_param
*addr_param
;
3369 sctp_addip_param_t
*asconf_param
;
3371 int asconf_len
= asconf
->skb
->len
;
3372 int all_param_pass
= 0;
3375 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3377 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3378 * a pointer to address parameter.
3380 length
= sizeof(sctp_addip_chunk_t
);
3381 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3382 asconf_len
-= length
;
3384 /* Skip the address parameter in the last asconf sent and store a
3385 * pointer to the first asconf parameter.
3387 length
= ntohs(addr_param
->p
.length
);
3388 asconf_param
= (void *)addr_param
+ length
;
3389 asconf_len
-= length
;
3392 * A8) If there is no response(s) to specific TLV parameter(s), and no
3393 * failures are indicated, then all request(s) are considered
3396 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3399 /* Process the TLVs contained in the last sent ASCONF chunk. */
3400 while (asconf_len
> 0) {
3402 err_code
= SCTP_ERROR_NO_ERROR
;
3404 err_code
= sctp_get_asconf_response(asconf_ack
,
3407 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3412 case SCTP_ERROR_NO_ERROR
:
3413 sctp_asconf_param_success(asoc
, asconf_param
);
3416 case SCTP_ERROR_RSRC_LOW
:
3420 case SCTP_ERROR_UNKNOWN_PARAM
:
3421 /* Disable sending this type of asconf parameter in
3424 asoc
->peer
.addip_disabled_mask
|=
3425 asconf_param
->param_hdr
.type
;
3428 case SCTP_ERROR_REQ_REFUSED
:
3429 case SCTP_ERROR_DEL_LAST_IP
:
3430 case SCTP_ERROR_DEL_SRC_IP
:
3435 /* Skip the processed asconf parameter and move to the next
3438 length
= ntohs(asconf_param
->param_hdr
.length
);
3439 asconf_param
= (void *)asconf_param
+ length
;
3440 asconf_len
-= length
;
3443 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3444 asoc
->src_out_of_asoc_ok
= 0;
3445 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3448 /* Free the cached last sent asconf chunk. */
3449 list_del_init(&asconf
->transmitted_list
);
3450 sctp_chunk_free(asconf
);
3451 asoc
->addip_last_asconf
= NULL
;
3456 /* Make a FWD TSN chunk. */
3457 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3458 __u32 new_cum_tsn
, size_t nstreams
,
3459 struct sctp_fwdtsn_skip
*skiplist
)
3461 struct sctp_chunk
*retval
= NULL
;
3462 struct sctp_fwdtsn_hdr ftsn_hdr
;
3463 struct sctp_fwdtsn_skip skip
;
3467 hint
= (nstreams
+ 1) * sizeof(__u32
);
3469 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
);
3474 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3475 retval
->subh
.fwdtsn_hdr
=
3476 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3478 for (i
= 0; i
< nstreams
; i
++) {
3479 skip
.stream
= skiplist
[i
].stream
;
3480 skip
.ssn
= skiplist
[i
].ssn
;
3481 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);