1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * C. Robin <chris@hundredacre.ac.uk>
37 * Jon Grimm <jgrimm@us.ibm.com>
38 * Xingang Guo <xingang.guo@intel.com>
39 * Dajiang Zhang <dajiang.zhang@nokia.com>
40 * Sridhar Samudrala <sri@us.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Ardelle Fan <ardelle.fan@intel.com>
43 * Kevin Gao <kevin.gao@intel.com>
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <crypto/hash.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
52 #include <linux/ipv6.h>
53 #include <linux/net.h>
54 #include <linux/inet.h>
55 #include <linux/scatterlist.h>
56 #include <linux/slab.h>
59 #include <linux/skbuff.h>
60 #include <linux/random.h> /* for get_random_bytes */
61 #include <net/sctp/sctp.h>
62 #include <net/sctp/sm.h>
64 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
65 __u8 type
, __u8 flags
, int paylen
,
67 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
68 __u8 flags
, int paylen
, gfp_t gfp
);
69 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
70 __u8 type
, __u8 flags
, int paylen
,
72 static struct sctp_cookie_param
*sctp_pack_cookie(
73 const struct sctp_endpoint
*ep
,
74 const struct sctp_association
*asoc
,
75 const struct sctp_chunk
*init_chunk
,
77 const __u8
*raw_addrs
, int addrs_len
);
78 static int sctp_process_param(struct sctp_association
*asoc
,
79 union sctp_params param
,
80 const union sctp_addr
*peer_addr
,
82 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
84 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*, int len
,
87 /* Control chunk destructor */
88 static void sctp_control_release_owner(struct sk_buff
*skb
)
90 /*TODO: do memory release */
93 static void sctp_control_set_owner_w(struct sctp_chunk
*chunk
)
95 struct sctp_association
*asoc
= chunk
->asoc
;
96 struct sk_buff
*skb
= chunk
->skb
;
98 /* TODO: properly account for control chunks.
99 * To do it right we'll need:
100 * 1) endpoint if association isn't known.
101 * 2) proper memory accounting.
103 * For now don't do anything for now.
105 skb
->sk
= asoc
? asoc
->base
.sk
: NULL
;
106 skb
->destructor
= sctp_control_release_owner
;
109 /* What was the inbound interface for this chunk? */
110 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
112 struct sk_buff
*skb
= chunk
->skb
;
114 return SCTP_INPUT_CB(skb
)->af
->skb_iif(skb
);
117 /* RFC 2960 3.3.2 Initiation (INIT) (1)
119 * Note 2: The ECN capable field is reserved for future use of
120 * Explicit Congestion Notification.
122 static const struct sctp_paramhdr ecap_param
= {
123 SCTP_PARAM_ECN_CAPABLE
,
124 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
126 static const struct sctp_paramhdr prsctp_param
= {
127 SCTP_PARAM_FWD_TSN_SUPPORT
,
128 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
131 /* A helper to initialize an op error inside a
132 * provided chunk, as most cause codes will be embedded inside an
135 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
138 struct sctp_errhdr err
;
141 /* Cause code constants are now defined in network order. */
142 err
.cause
= cause_code
;
143 len
= sizeof(err
) + paylen
;
144 err
.length
= htons(len
);
145 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(err
), &err
);
148 /* A helper to initialize an op error inside a
149 * provided chunk, as most cause codes will be embedded inside an
150 * abort chunk. Differs from sctp_init_cause in that it won't oops
151 * if there isn't enough space in the op error chunk
153 static int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
156 struct sctp_errhdr err
;
159 /* Cause code constants are now defined in network order. */
160 err
.cause
= cause_code
;
161 len
= sizeof(err
) + paylen
;
162 err
.length
= htons(len
);
164 if (skb_tailroom(chunk
->skb
) < len
)
167 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
, sizeof(err
), &err
);
171 /* 3.3.2 Initiation (INIT) (1)
173 * This chunk is used to initiate a SCTP association between two
174 * endpoints. The format of the INIT chunk is shown below:
177 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * | Type = 1 | Chunk Flags | Chunk Length |
180 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Advertised Receiver Window Credit (a_rwnd) |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
185 * | Number of Outbound Streams | Number of Inbound Streams |
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
190 * / Optional/Variable-Length Parameters /
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
195 * The INIT chunk contains the following parameters. Unless otherwise
196 * noted, each parameter MUST only be included once in the INIT chunk.
198 * Fixed Parameters Status
199 * ----------------------------------------------
200 * Initiate Tag Mandatory
201 * Advertised Receiver Window Credit Mandatory
202 * Number of Outbound Streams Mandatory
203 * Number of Inbound Streams Mandatory
204 * Initial TSN Mandatory
206 * Variable Parameters Status Type Value
207 * -------------------------------------------------------------
208 * IPv4 Address (Note 1) Optional 5
209 * IPv6 Address (Note 1) Optional 6
210 * Cookie Preservative Optional 9
211 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
212 * Host Name Address (Note 3) Optional 11
213 * Supported Address Types (Note 4) Optional 12
215 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
216 const struct sctp_bind_addr
*bp
,
217 gfp_t gfp
, int vparam_len
)
219 struct net
*net
= sock_net(asoc
->base
.sk
);
220 struct sctp_supported_ext_param ext_param
;
221 struct sctp_adaptation_ind_param aiparam
;
222 struct sctp_paramhdr
*auth_chunks
= NULL
;
223 struct sctp_paramhdr
*auth_hmacs
= NULL
;
224 struct sctp_supported_addrs_param sat
;
225 struct sctp_endpoint
*ep
= asoc
->ep
;
226 struct sctp_chunk
*retval
= NULL
;
227 int num_types
, addrs_len
= 0;
228 struct sctp_inithdr init
;
229 union sctp_params addrs
;
230 struct sctp_sock
*sp
;
236 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 * Note 1: The INIT chunks can contain multiple addresses that
239 * can be IPv4 and/or IPv6 in any combination.
242 /* Convert the provided bind address list to raw format. */
243 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
245 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
246 init
.a_rwnd
= htonl(asoc
->rwnd
);
247 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
248 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
249 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
251 /* How many address types are needed? */
252 sp
= sctp_sk(asoc
->base
.sk
);
253 num_types
= sp
->pf
->supported_addrs(sp
, types
);
255 chunksize
= sizeof(init
) + addrs_len
;
256 chunksize
+= SCTP_PAD4(SCTP_SAT_LEN(num_types
));
257 chunksize
+= sizeof(ecap_param
);
259 if (asoc
->prsctp_enable
)
260 chunksize
+= sizeof(prsctp_param
);
262 /* ADDIP: Section 4.2.7:
263 * An implementation supporting this extension [ADDIP] MUST list
264 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
265 * INIT-ACK parameters.
267 if (net
->sctp
.addip_enable
) {
268 extensions
[num_ext
] = SCTP_CID_ASCONF
;
269 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
273 if (asoc
->reconf_enable
) {
274 extensions
[num_ext
] = SCTP_CID_RECONF
;
278 if (sp
->adaptation_ind
)
279 chunksize
+= sizeof(aiparam
);
281 chunksize
+= vparam_len
;
283 /* Account for AUTH related parameters */
284 if (ep
->auth_enable
) {
285 /* Add random parameter length*/
286 chunksize
+= sizeof(asoc
->c
.auth_random
);
288 /* Add HMACS parameter length if any were defined */
289 auth_hmacs
= (struct sctp_paramhdr
*)asoc
->c
.auth_hmacs
;
290 if (auth_hmacs
->length
)
291 chunksize
+= SCTP_PAD4(ntohs(auth_hmacs
->length
));
295 /* Add CHUNKS parameter length */
296 auth_chunks
= (struct sctp_paramhdr
*)asoc
->c
.auth_chunks
;
297 if (auth_chunks
->length
)
298 chunksize
+= SCTP_PAD4(ntohs(auth_chunks
->length
));
302 extensions
[num_ext
] = SCTP_CID_AUTH
;
306 /* If we have any extensions to report, account for that */
308 chunksize
+= SCTP_PAD4(sizeof(ext_param
) + num_ext
);
310 /* RFC 2960 3.3.2 Initiation (INIT) (1)
312 * Note 3: An INIT chunk MUST NOT contain more than one Host
313 * Name address parameter. Moreover, the sender of the INIT
314 * MUST NOT combine any other address types with the Host Name
315 * address in the INIT. The receiver of INIT MUST ignore any
316 * other address types if the Host Name address parameter is
317 * present in the received INIT chunk.
319 * PLEASE DO NOT FIXME [This version does not support Host Name.]
322 retval
= sctp_make_control(asoc
, SCTP_CID_INIT
, 0, chunksize
, gfp
);
326 retval
->subh
.init_hdr
=
327 sctp_addto_chunk(retval
, sizeof(init
), &init
);
328 retval
->param_hdr
.v
=
329 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
331 /* RFC 2960 3.3.2 Initiation (INIT) (1)
333 * Note 4: This parameter, when present, specifies all the
334 * address types the sending endpoint can support. The absence
335 * of this parameter indicates that the sending endpoint can
336 * support any address type.
338 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
339 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
340 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
341 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
343 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
345 /* Add the supported extensions parameter. Be nice and add this
346 * fist before addiding the parameters for the extensions themselves
349 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
350 ext_param
.param_hdr
.length
= htons(sizeof(ext_param
) + num_ext
);
351 sctp_addto_chunk(retval
, sizeof(ext_param
), &ext_param
);
352 sctp_addto_param(retval
, num_ext
, extensions
);
355 if (asoc
->prsctp_enable
)
356 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
358 if (sp
->adaptation_ind
) {
359 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
360 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
361 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
362 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
365 /* Add SCTP-AUTH chunks to the parameter list */
366 if (ep
->auth_enable
) {
367 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
368 asoc
->c
.auth_random
);
370 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
373 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
381 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
382 const struct sctp_chunk
*chunk
,
383 gfp_t gfp
, int unkparam_len
)
385 struct sctp_supported_ext_param ext_param
;
386 struct sctp_adaptation_ind_param aiparam
;
387 struct sctp_paramhdr
*auth_chunks
= NULL
;
388 struct sctp_paramhdr
*auth_random
= NULL
;
389 struct sctp_paramhdr
*auth_hmacs
= NULL
;
390 struct sctp_chunk
*retval
= NULL
;
391 struct sctp_cookie_param
*cookie
;
392 struct sctp_inithdr initack
;
393 union sctp_params addrs
;
394 struct sctp_sock
*sp
;
401 /* Note: there may be no addresses to embed. */
402 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
404 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
405 initack
.a_rwnd
= htonl(asoc
->rwnd
);
406 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
407 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
408 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
410 /* FIXME: We really ought to build the cookie right
411 * into the packet instead of allocating more fresh memory.
413 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
418 /* Calculate the total size of allocation, include the reserved
419 * space for reporting unknown parameters if it is specified.
421 sp
= sctp_sk(asoc
->base
.sk
);
422 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
424 /* Tell peer that we'll do ECN only if peer advertised such cap. */
425 if (asoc
->peer
.ecn_capable
)
426 chunksize
+= sizeof(ecap_param
);
428 if (asoc
->peer
.prsctp_capable
)
429 chunksize
+= sizeof(prsctp_param
);
431 if (asoc
->peer
.asconf_capable
) {
432 extensions
[num_ext
] = SCTP_CID_ASCONF
;
433 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
437 if (asoc
->peer
.reconf_capable
) {
438 extensions
[num_ext
] = SCTP_CID_RECONF
;
442 if (sp
->adaptation_ind
)
443 chunksize
+= sizeof(aiparam
);
445 if (asoc
->peer
.auth_capable
) {
446 auth_random
= (struct sctp_paramhdr
*)asoc
->c
.auth_random
;
447 chunksize
+= ntohs(auth_random
->length
);
449 auth_hmacs
= (struct sctp_paramhdr
*)asoc
->c
.auth_hmacs
;
450 if (auth_hmacs
->length
)
451 chunksize
+= SCTP_PAD4(ntohs(auth_hmacs
->length
));
455 auth_chunks
= (struct sctp_paramhdr
*)asoc
->c
.auth_chunks
;
456 if (auth_chunks
->length
)
457 chunksize
+= SCTP_PAD4(ntohs(auth_chunks
->length
));
461 extensions
[num_ext
] = SCTP_CID_AUTH
;
466 chunksize
+= SCTP_PAD4(sizeof(ext_param
) + num_ext
);
468 /* Now allocate and fill out the chunk. */
469 retval
= sctp_make_control(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
, gfp
);
473 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
475 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
476 * HEARTBEAT ACK, * etc.) to the same destination transport
477 * address from which it received the DATA or control chunk
478 * to which it is replying.
480 * [INIT ACK back to where the INIT came from.]
482 retval
->transport
= chunk
->transport
;
484 retval
->subh
.init_hdr
=
485 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
486 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
487 sctp_addto_chunk(retval
, cookie_len
, cookie
);
488 if (asoc
->peer
.ecn_capable
)
489 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
491 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
492 ext_param
.param_hdr
.length
= htons(sizeof(ext_param
) + num_ext
);
493 sctp_addto_chunk(retval
, sizeof(ext_param
), &ext_param
);
494 sctp_addto_param(retval
, num_ext
, extensions
);
496 if (asoc
->peer
.prsctp_capable
)
497 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
499 if (sp
->adaptation_ind
) {
500 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
501 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
502 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
503 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
506 if (asoc
->peer
.auth_capable
) {
507 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
510 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
513 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
517 /* We need to remove the const qualifier at this point. */
518 retval
->asoc
= (struct sctp_association
*) asoc
;
527 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
529 * This chunk is used only during the initialization of an association.
530 * It is sent by the initiator of an association to its peer to complete
531 * the initialization process. This chunk MUST precede any DATA chunk
532 * sent within the association, but MAY be bundled with one or more DATA
533 * chunks in the same packet.
536 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * | Type = 10 |Chunk Flags | Length |
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * Set to zero on transmit and ignored on receipt.
548 * Length: 16 bits (unsigned integer)
550 * Set to the size of the chunk in bytes, including the 4 bytes of
551 * the chunk header and the size of the Cookie.
553 * Cookie: variable size
555 * This field must contain the exact cookie received in the
556 * State Cookie parameter from the previous INIT ACK.
558 * An implementation SHOULD make the cookie as small as possible
559 * to insure interoperability.
561 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
562 const struct sctp_chunk
*chunk
)
564 struct sctp_chunk
*retval
;
568 cookie
= asoc
->peer
.cookie
;
569 cookie_len
= asoc
->peer
.cookie_len
;
571 /* Build a cookie echo chunk. */
572 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ECHO
, 0,
573 cookie_len
, GFP_ATOMIC
);
576 retval
->subh
.cookie_hdr
=
577 sctp_addto_chunk(retval
, cookie_len
, cookie
);
579 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
581 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
582 * HEARTBEAT ACK, * etc.) to the same destination transport
583 * address from which it * received the DATA or control chunk
584 * to which it is replying.
586 * [COOKIE ECHO back to where the INIT ACK came from.]
589 retval
->transport
= chunk
->transport
;
595 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
597 * This chunk is used only during the initialization of an
598 * association. It is used to acknowledge the receipt of a COOKIE
599 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
600 * within the association, but MAY be bundled with one or more DATA
601 * chunks or SACK chunk in the same SCTP packet.
604 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
606 * | Type = 11 |Chunk Flags | Length = 4 |
607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * Chunk Flags: 8 bits
611 * Set to zero on transmit and ignored on receipt.
613 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
614 const struct sctp_chunk
*chunk
)
616 struct sctp_chunk
*retval
;
618 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0, GFP_ATOMIC
);
620 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
622 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
623 * HEARTBEAT ACK, * etc.) to the same destination transport
624 * address from which it * received the DATA or control chunk
625 * to which it is replying.
627 * [COOKIE ACK back to where the COOKIE ECHO came from.]
630 retval
->transport
= chunk
->transport
;
636 * Appendix A: Explicit Congestion Notification:
639 * RFC 2481 details a specific bit for a sender to send in the header of
640 * its next outbound TCP segment to indicate to its peer that it has
641 * reduced its congestion window. This is termed the CWR bit. For
642 * SCTP the same indication is made by including the CWR chunk.
643 * This chunk contains one data element, i.e. the TSN number that
644 * was sent in the ECNE chunk. This element represents the lowest
645 * TSN number in the datagram that was originally marked with the
649 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
650 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
652 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653 * | Lowest TSN Number |
654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * Note: The CWR is considered a Control chunk.
658 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
659 const __u32 lowest_tsn
,
660 const struct sctp_chunk
*chunk
)
662 struct sctp_chunk
*retval
;
663 struct sctp_cwrhdr cwr
;
665 cwr
.lowest_tsn
= htonl(lowest_tsn
);
666 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_CWR
, 0,
667 sizeof(cwr
), GFP_ATOMIC
);
672 retval
->subh
.ecn_cwr_hdr
=
673 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
675 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
677 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
678 * HEARTBEAT ACK, * etc.) to the same destination transport
679 * address from which it * received the DATA or control chunk
680 * to which it is replying.
682 * [Report a reduced congestion window back to where the ECNE
686 retval
->transport
= chunk
->transport
;
692 /* Make an ECNE chunk. This is a congestion experienced report. */
693 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
694 const __u32 lowest_tsn
)
696 struct sctp_chunk
*retval
;
697 struct sctp_ecnehdr ecne
;
699 ecne
.lowest_tsn
= htonl(lowest_tsn
);
700 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_ECNE
, 0,
701 sizeof(ecne
), GFP_ATOMIC
);
704 retval
->subh
.ecne_hdr
=
705 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
711 /* Make a DATA chunk for the given association from the provided
712 * parameters. However, do not populate the data payload.
714 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
715 const struct sctp_sndrcvinfo
*sinfo
,
716 int data_len
, __u8 flags
, __u16 ssn
,
719 struct sctp_chunk
*retval
;
720 struct sctp_datahdr dp
;
723 /* We assign the TSN as LATE as possible, not here when
724 * creating the chunk.
727 dp
.stream
= htons(sinfo
->sinfo_stream
);
728 dp
.ppid
= sinfo
->sinfo_ppid
;
730 /* Set the flags for an unordered send. */
731 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
732 flags
|= SCTP_DATA_UNORDERED
;
737 chunk_len
= sizeof(dp
) + data_len
;
738 retval
= sctp_make_data(asoc
, flags
, chunk_len
, gfp
);
742 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
743 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
749 /* Create a selective ackowledgement (SACK) for the given
750 * association. This reports on which TSN's we've seen to date,
751 * including duplicates and gaps.
753 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
755 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
756 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
757 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
758 __u16 num_gabs
, num_dup_tsns
;
759 struct sctp_transport
*trans
;
760 struct sctp_chunk
*retval
;
761 struct sctp_sackhdr sack
;
765 memset(gabs
, 0, sizeof(gabs
));
766 ctsn
= sctp_tsnmap_get_ctsn(map
);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__
, ctsn
);
770 /* How much room is needed in the chunk? */
771 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
772 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
774 /* Initialize the SACK header. */
775 sack
.cum_tsn_ack
= htonl(ctsn
);
776 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
777 sack
.num_gap_ack_blocks
= htons(num_gabs
);
778 sack
.num_dup_tsns
= htons(num_dup_tsns
);
781 + sizeof(struct sctp_gap_ack_block
) * num_gabs
782 + sizeof(__u32
) * num_dup_tsns
;
784 /* Create the chunk. */
785 retval
= sctp_make_control(asoc
, SCTP_CID_SACK
, 0, len
, GFP_ATOMIC
);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval
->transport
= asoc
->peer
.last_data_from
;
821 retval
->subh
.sack_hdr
=
822 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
829 /* Add the duplicate TSN information. */
831 aptr
->stats
.idupchunks
+= num_dup_tsns
;
832 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
833 sctp_tsnmap_get_dups(map
));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++aptr
->peer
.sack_generation
== 0) {
844 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
846 trans
->sack_generation
= 0;
847 aptr
->peer
.sack_generation
= 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
855 const struct sctp_chunk
*chunk
)
857 struct sctp_shutdownhdr shut
;
858 struct sctp_chunk
*retval
;
861 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
862 shut
.cum_tsn_ack
= htonl(ctsn
);
864 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN
, 0,
865 sizeof(shut
), GFP_ATOMIC
);
869 retval
->subh
.shutdown_hdr
=
870 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
873 retval
->transport
= chunk
->transport
;
878 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
879 const struct sctp_chunk
*chunk
)
881 struct sctp_chunk
*retval
;
883 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0,
886 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
888 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
889 * HEARTBEAT ACK, * etc.) to the same destination transport
890 * address from which it * received the DATA or control chunk
891 * to which it is replying.
893 * [ACK back to where the SHUTDOWN came from.]
896 retval
->transport
= chunk
->transport
;
901 struct sctp_chunk
*sctp_make_shutdown_complete(
902 const struct sctp_association
*asoc
,
903 const struct sctp_chunk
*chunk
)
905 struct sctp_chunk
*retval
;
908 /* Set the T-bit if we have no association (vtag will be
911 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
913 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
,
916 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
918 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
919 * HEARTBEAT ACK, * etc.) to the same destination transport
920 * address from which it * received the DATA or control chunk
921 * to which it is replying.
923 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
927 retval
->transport
= chunk
->transport
;
932 /* Create an ABORT. Note that we set the T bit if we have no
933 * association, except when responding to an INIT (sctpimpguide 2.41).
935 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
936 const struct sctp_chunk
*chunk
,
939 struct sctp_chunk
*retval
;
942 /* Set the T-bit if we have no association and 'chunk' is not
943 * an INIT (vtag will be reflected).
946 if (chunk
&& chunk
->chunk_hdr
&&
947 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
950 flags
= SCTP_CHUNK_FLAG_T
;
953 retval
= sctp_make_control(asoc
, SCTP_CID_ABORT
, flags
, hint
,
956 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
958 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
959 * HEARTBEAT ACK, * etc.) to the same destination transport
960 * address from which it * received the DATA or control chunk
961 * to which it is replying.
963 * [ABORT back to where the offender came from.]
966 retval
->transport
= chunk
->transport
;
971 /* Helper to create ABORT with a NO_USER_DATA error. */
972 struct sctp_chunk
*sctp_make_abort_no_data(
973 const struct sctp_association
*asoc
,
974 const struct sctp_chunk
*chunk
,
977 struct sctp_chunk
*retval
;
980 retval
= sctp_make_abort(asoc
, chunk
,
981 sizeof(struct sctp_errhdr
) + sizeof(tsn
));
986 /* Put the tsn back into network byte order. */
987 payload
= htonl(tsn
);
988 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
989 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
991 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
993 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
994 * HEARTBEAT ACK, * etc.) to the same destination transport
995 * address from which it * received the DATA or control chunk
996 * to which it is replying.
998 * [ABORT back to where the offender came from.]
1001 retval
->transport
= chunk
->transport
;
1007 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1008 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
1012 struct sctp_chunk
*retval
;
1013 void *payload
= NULL
;
1016 retval
= sctp_make_abort(asoc
, NULL
,
1017 sizeof(struct sctp_errhdr
) + paylen
);
1022 /* Put the msg_iov together into payload. */
1023 payload
= kmalloc(paylen
, GFP_KERNEL
);
1027 err
= memcpy_from_msg(payload
, msg
, paylen
);
1032 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1033 sctp_addto_chunk(retval
, paylen
, payload
);
1043 sctp_chunk_free(retval
);
1049 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1052 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1055 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1058 target
= skb_put(chunk
->skb
, len
);
1061 memcpy(target
, data
, len
);
1063 memset(target
, 0, len
);
1065 /* Adjust the chunk length field. */
1066 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1067 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1072 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1073 struct sctp_chunk
*sctp_make_abort_violation(
1074 const struct sctp_association
*asoc
,
1075 const struct sctp_chunk
*chunk
,
1076 const __u8
*payload
,
1077 const size_t paylen
)
1079 struct sctp_chunk
*retval
;
1080 struct sctp_paramhdr phdr
;
1082 retval
= sctp_make_abort(asoc
, chunk
, sizeof(struct sctp_errhdr
) +
1083 paylen
+ sizeof(phdr
));
1087 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
+
1090 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1091 phdr
.length
= chunk
->chunk_hdr
->length
;
1092 sctp_addto_chunk(retval
, paylen
, payload
);
1093 sctp_addto_param(retval
, sizeof(phdr
), &phdr
);
1099 struct sctp_chunk
*sctp_make_violation_paramlen(
1100 const struct sctp_association
*asoc
,
1101 const struct sctp_chunk
*chunk
,
1102 struct sctp_paramhdr
*param
)
1104 static const char error
[] = "The following parameter had invalid length:";
1105 size_t payload_len
= sizeof(error
) + sizeof(struct sctp_errhdr
) +
1107 struct sctp_chunk
*retval
;
1109 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1113 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1114 sizeof(error
) + sizeof(*param
));
1115 sctp_addto_chunk(retval
, sizeof(error
), error
);
1116 sctp_addto_param(retval
, sizeof(*param
), param
);
1122 struct sctp_chunk
*sctp_make_violation_max_retrans(
1123 const struct sctp_association
*asoc
,
1124 const struct sctp_chunk
*chunk
)
1126 static const char error
[] = "Association exceeded its max_retans count";
1127 size_t payload_len
= sizeof(error
) + sizeof(struct sctp_errhdr
);
1128 struct sctp_chunk
*retval
;
1130 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1134 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1135 sctp_addto_chunk(retval
, sizeof(error
), error
);
1141 /* Make a HEARTBEAT chunk. */
1142 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1143 const struct sctp_transport
*transport
)
1145 struct sctp_sender_hb_info hbinfo
;
1146 struct sctp_chunk
*retval
;
1148 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT
, 0,
1149 sizeof(hbinfo
), GFP_ATOMIC
);
1154 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1155 hbinfo
.param_hdr
.length
= htons(sizeof(hbinfo
));
1156 hbinfo
.daddr
= transport
->ipaddr
;
1157 hbinfo
.sent_at
= jiffies
;
1158 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1160 /* Cast away the 'const', as this is just telling the chunk
1161 * what transport it belongs to.
1163 retval
->transport
= (struct sctp_transport
*) transport
;
1164 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1171 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1172 const struct sctp_chunk
*chunk
,
1173 const void *payload
,
1174 const size_t paylen
)
1176 struct sctp_chunk
*retval
;
1178 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
,
1183 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1185 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1187 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1188 * HEARTBEAT ACK, * etc.) to the same destination transport
1189 * address from which it * received the DATA or control chunk
1190 * to which it is replying.
1192 * [HBACK back to where the HEARTBEAT came from.]
1195 retval
->transport
= chunk
->transport
;
1201 /* Create an Operation Error chunk with the specified space reserved.
1202 * This routine can be used for containing multiple causes in the chunk.
1204 static struct sctp_chunk
*sctp_make_op_error_space(
1205 const struct sctp_association
*asoc
,
1206 const struct sctp_chunk
*chunk
,
1209 struct sctp_chunk
*retval
;
1211 retval
= sctp_make_control(asoc
, SCTP_CID_ERROR
, 0,
1212 sizeof(struct sctp_errhdr
) + size
,
1217 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1219 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1220 * HEARTBEAT ACK, etc.) to the same destination transport
1221 * address from which it received the DATA or control chunk
1222 * to which it is replying.
1226 retval
->transport
= chunk
->transport
;
1232 /* Create an Operation Error chunk of a fixed size,
1233 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1234 * This is a helper function to allocate an error chunk for
1235 * for those invalid parameter codes in which we may not want
1236 * to report all the errors, if the incoming chunk is large
1238 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1239 const struct sctp_association
*asoc
,
1240 const struct sctp_chunk
*chunk
)
1242 size_t size
= asoc
? asoc
->pathmtu
: 0;
1245 size
= SCTP_DEFAULT_MAXSEGMENT
;
1247 return sctp_make_op_error_space(asoc
, chunk
, size
);
1250 /* Create an Operation Error chunk. */
1251 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1252 const struct sctp_chunk
*chunk
,
1253 __be16 cause_code
, const void *payload
,
1254 size_t paylen
, size_t reserve_tail
)
1256 struct sctp_chunk
*retval
;
1258 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1262 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1263 sctp_addto_chunk(retval
, paylen
, payload
);
1265 sctp_addto_param(retval
, reserve_tail
, NULL
);
1271 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1273 struct sctp_authhdr auth_hdr
;
1274 struct sctp_hmac
*hmac_desc
;
1275 struct sctp_chunk
*retval
;
1278 /* Get the first hmac that the peer told us to use */
1279 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1280 if (unlikely(!hmac_desc
))
1283 retval
= sctp_make_control(asoc
, SCTP_CID_AUTH
, 0,
1284 hmac_desc
->hmac_len
+ sizeof(auth_hdr
),
1289 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1290 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1292 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(auth_hdr
),
1295 hmac
= skb_put_zero(retval
->skb
, hmac_desc
->hmac_len
);
1297 /* Adjust the chunk header to include the empty MAC */
1298 retval
->chunk_hdr
->length
=
1299 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1300 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1306 /********************************************************************
1307 * 2nd Level Abstractions
1308 ********************************************************************/
1310 /* Turn an skb into a chunk.
1311 * FIXME: Eventually move the structure directly inside the skb->cb[].
1313 * sctpimpguide-05.txt Section 2.8.2
1314 * M1) Each time a new DATA chunk is transmitted
1315 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1316 * 'TSN.Missing.Report' count will be used to determine missing chunks
1317 * and when to fast retransmit.
1320 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1321 const struct sctp_association
*asoc
,
1322 struct sock
*sk
, gfp_t gfp
)
1324 struct sctp_chunk
*retval
;
1326 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, gfp
);
1331 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1333 INIT_LIST_HEAD(&retval
->list
);
1335 retval
->asoc
= (struct sctp_association
*)asoc
;
1336 retval
->singleton
= 1;
1338 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1340 /* Polish the bead hole. */
1341 INIT_LIST_HEAD(&retval
->transmitted_list
);
1342 INIT_LIST_HEAD(&retval
->frag_list
);
1343 SCTP_DBG_OBJCNT_INC(chunk
);
1344 refcount_set(&retval
->refcnt
, 1);
1350 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1351 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1352 union sctp_addr
*dest
)
1354 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1355 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1358 /* Extract the source address from a chunk. */
1359 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1361 /* If we have a known transport, use that. */
1362 if (chunk
->transport
) {
1363 return &chunk
->transport
->ipaddr
;
1365 /* Otherwise, extract it from the IP header. */
1366 return &chunk
->source
;
1370 /* Create a new chunk, setting the type and flags headers from the
1371 * arguments, reserving enough space for a 'paylen' byte payload.
1373 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1374 __u8 type
, __u8 flags
, int paylen
,
1377 struct sctp_chunkhdr
*chunk_hdr
;
1378 struct sctp_chunk
*retval
;
1379 struct sk_buff
*skb
;
1383 chunklen
= SCTP_PAD4(sizeof(*chunk_hdr
) + paylen
);
1384 if (chunklen
> SCTP_MAX_CHUNK_LEN
)
1387 /* No need to allocate LL here, as this is only a chunk. */
1388 skb
= alloc_skb(chunklen
, gfp
);
1392 /* Make room for the chunk header. */
1393 chunk_hdr
= (struct sctp_chunkhdr
*)skb_put(skb
, sizeof(*chunk_hdr
));
1394 chunk_hdr
->type
= type
;
1395 chunk_hdr
->flags
= flags
;
1396 chunk_hdr
->length
= htons(sizeof(*chunk_hdr
));
1398 sk
= asoc
? asoc
->base
.sk
: NULL
;
1399 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1405 retval
->chunk_hdr
= chunk_hdr
;
1406 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(*chunk_hdr
);
1408 /* Determine if the chunk needs to be authenticated */
1409 if (sctp_auth_send_cid(type
, asoc
))
1417 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1418 __u8 flags
, int paylen
, gfp_t gfp
)
1420 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1423 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1424 __u8 type
, __u8 flags
, int paylen
,
1427 struct sctp_chunk
*chunk
;
1429 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1431 sctp_control_set_owner_w(chunk
);
1436 /* Release the memory occupied by a chunk. */
1437 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1439 BUG_ON(!list_empty(&chunk
->list
));
1440 list_del_init(&chunk
->transmitted_list
);
1442 consume_skb(chunk
->skb
);
1443 consume_skb(chunk
->auth_chunk
);
1445 SCTP_DBG_OBJCNT_DEC(chunk
);
1446 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1449 /* Possibly, free the chunk. */
1450 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1452 /* Release our reference on the message tracker. */
1454 sctp_datamsg_put(chunk
->msg
);
1456 sctp_chunk_put(chunk
);
1459 /* Grab a reference to the chunk. */
1460 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1462 refcount_inc(&ch
->refcnt
);
1465 /* Release a reference to the chunk. */
1466 void sctp_chunk_put(struct sctp_chunk
*ch
)
1468 if (refcount_dec_and_test(&ch
->refcnt
))
1469 sctp_chunk_destroy(ch
);
1472 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1475 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1477 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1478 int padlen
= SCTP_PAD4(chunklen
) - chunklen
;
1481 skb_put_zero(chunk
->skb
, padlen
);
1482 target
= skb_put_data(chunk
->skb
, data
, len
);
1484 /* Adjust the chunk length field. */
1485 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1486 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1491 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1492 * space in the chunk
1494 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1495 int len
, const void *data
)
1497 if (skb_tailroom(chunk
->skb
) >= len
)
1498 return sctp_addto_chunk(chunk
, len
, data
);
1503 /* Append bytes from user space to the end of a chunk. Will panic if
1504 * chunk is not big enough.
1505 * Returns a kernel err value.
1507 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1508 struct iov_iter
*from
)
1512 /* Make room in chunk for data. */
1513 target
= skb_put(chunk
->skb
, len
);
1515 /* Copy data (whole iovec) into chunk */
1516 if (!copy_from_iter_full(target
, len
, from
))
1519 /* Adjust the chunk length field. */
1520 chunk
->chunk_hdr
->length
=
1521 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1522 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1527 /* Helper function to assign a TSN if needed. This assumes that both
1528 * the data_hdr and association have already been assigned.
1530 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1532 struct sctp_stream
*stream
;
1533 struct sctp_chunk
*lchunk
;
1534 struct sctp_datamsg
*msg
;
1540 /* All fragments will be on the same stream */
1541 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1542 stream
= &chunk
->asoc
->stream
;
1544 /* Now assign the sequence number to the entire message.
1545 * All fragments must have the same stream sequence number.
1548 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1549 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1552 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1553 ssn
= sctp_ssn_next(stream
, out
, sid
);
1555 ssn
= sctp_ssn_peek(stream
, out
, sid
);
1558 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1559 lchunk
->has_ssn
= 1;
1563 /* Helper function to assign a TSN if needed. This assumes that both
1564 * the data_hdr and association have already been assigned.
1566 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1568 if (!chunk
->has_tsn
) {
1569 /* This is the last possible instant to
1572 chunk
->subh
.data_hdr
->tsn
=
1573 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1578 /* Create a CLOSED association to use with an incoming packet. */
1579 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1580 struct sctp_chunk
*chunk
,
1583 struct sctp_association
*asoc
;
1584 enum sctp_scope scope
;
1585 struct sk_buff
*skb
;
1587 /* Create the bare association. */
1588 scope
= sctp_scope(sctp_source(chunk
));
1589 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1594 /* Create an entry for the source address of the packet. */
1595 SCTP_INPUT_CB(skb
)->af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1601 /* Build a cookie representing asoc.
1602 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1604 static struct sctp_cookie_param
*sctp_pack_cookie(
1605 const struct sctp_endpoint
*ep
,
1606 const struct sctp_association
*asoc
,
1607 const struct sctp_chunk
*init_chunk
,
1608 int *cookie_len
, const __u8
*raw_addrs
,
1611 struct sctp_signed_cookie
*cookie
;
1612 struct sctp_cookie_param
*retval
;
1613 int headersize
, bodysize
;
1615 /* Header size is static data prior to the actual cookie, including
1618 headersize
= sizeof(struct sctp_paramhdr
) +
1619 (sizeof(struct sctp_signed_cookie
) -
1620 sizeof(struct sctp_cookie
));
1621 bodysize
= sizeof(struct sctp_cookie
)
1622 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1624 /* Pad out the cookie to a multiple to make the signature
1625 * functions simpler to write.
1627 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1628 bodysize
+= SCTP_COOKIE_MULTIPLE
1629 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1630 *cookie_len
= headersize
+ bodysize
;
1632 /* Clear this memory since we are sending this data structure
1633 * out on the network.
1635 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1639 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1641 /* Set up the parameter header. */
1642 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1643 retval
->p
.length
= htons(*cookie_len
);
1645 /* Copy the cookie part of the association itself. */
1646 cookie
->c
= asoc
->c
;
1647 /* Save the raw address list length in the cookie. */
1648 cookie
->c
.raw_addr_list_len
= addrs_len
;
1650 /* Remember PR-SCTP capability. */
1651 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1653 /* Save adaptation indication in the cookie. */
1654 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1656 /* Set an expiration time for the cookie. */
1657 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1660 /* Copy the peer's init packet. */
1661 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1662 ntohs(init_chunk
->chunk_hdr
->length
));
1664 /* Copy the raw local address list of the association. */
1665 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1666 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1668 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1669 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1672 /* Sign the message. */
1673 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1676 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1677 sizeof(ep
->secret_key
)) ?:
1678 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1680 shash_desc_zero(desc
);
1694 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1695 struct sctp_association
*sctp_unpack_cookie(
1696 const struct sctp_endpoint
*ep
,
1697 const struct sctp_association
*asoc
,
1698 struct sctp_chunk
*chunk
, gfp_t gfp
,
1699 int *error
, struct sctp_chunk
**errp
)
1701 struct sctp_association
*retval
= NULL
;
1702 int headersize
, bodysize
, fixed_size
;
1703 struct sctp_signed_cookie
*cookie
;
1704 struct sk_buff
*skb
= chunk
->skb
;
1705 struct sctp_cookie
*bear_cookie
;
1706 __u8
*digest
= ep
->digest
;
1707 enum sctp_scope scope
;
1711 /* Header size is static data prior to the actual cookie, including
1714 headersize
= sizeof(struct sctp_chunkhdr
) +
1715 (sizeof(struct sctp_signed_cookie
) -
1716 sizeof(struct sctp_cookie
));
1717 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1718 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1720 /* Verify that the chunk looks like it even has a cookie.
1721 * There must be enough room for our cookie and our peer's
1724 len
= ntohs(chunk
->chunk_hdr
->length
);
1725 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1728 /* Verify that the cookie has been padded out. */
1729 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1732 /* Process the cookie. */
1733 cookie
= chunk
->subh
.cookie_hdr
;
1734 bear_cookie
= &cookie
->c
;
1736 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1739 /* Check the signature. */
1741 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1744 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1747 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1748 sizeof(ep
->secret_key
)) ?:
1749 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1751 shash_desc_zero(desc
);
1754 *error
= -SCTP_IERROR_NOMEM
;
1759 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1760 *error
= -SCTP_IERROR_BAD_SIG
;
1765 /* IG Section 2.35.2:
1766 * 3) Compare the port numbers and the verification tag contained
1767 * within the COOKIE ECHO chunk to the actual port numbers and the
1768 * verification tag within the SCTP common header of the received
1769 * packet. If these values do not match the packet MUST be silently
1772 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1773 *error
= -SCTP_IERROR_BAD_TAG
;
1777 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1778 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1779 *error
= -SCTP_IERROR_BAD_PORTS
;
1783 /* Check to see if the cookie is stale. If there is already
1784 * an association, there is no need to check cookie's expiration
1785 * for init collision case of lost COOKIE ACK.
1786 * If skb has been timestamped, then use the stamp, otherwise
1787 * use current time. This introduces a small possibility that
1788 * that a cookie may be considered expired, but his would only slow
1789 * down the new association establishment instead of every packet.
1791 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1792 kt
= skb_get_ktime(skb
);
1794 kt
= ktime_get_real();
1796 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1798 * Section 3.3.10.3 Stale Cookie Error (3)
1802 * Stale Cookie Error: Indicates the receipt of a valid State
1803 * Cookie that has expired.
1805 len
= ntohs(chunk
->chunk_hdr
->length
);
1806 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1808 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1809 __be32 n
= htonl(usecs
);
1811 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1813 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1814 *error
= -SCTP_IERROR_STALE_COOKIE
;
1816 *error
= -SCTP_IERROR_NOMEM
;
1821 /* Make a new base association. */
1822 scope
= sctp_scope(sctp_source(chunk
));
1823 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1825 *error
= -SCTP_IERROR_NOMEM
;
1829 /* Set up our peer's port number. */
1830 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1832 /* Populate the association from the cookie. */
1833 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1835 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1837 *error
= -SCTP_IERROR_NOMEM
;
1841 /* Also, add the destination address. */
1842 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1843 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1844 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1848 retval
->next_tsn
= retval
->c
.initial_tsn
;
1849 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1850 retval
->addip_serial
= retval
->c
.initial_tsn
;
1851 retval
->strreset_outseq
= retval
->c
.initial_tsn
;
1852 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1853 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1854 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1856 /* The INIT stuff will be done by the side effects. */
1861 sctp_association_free(retval
);
1866 /* Yikes! The packet is either corrupt or deliberately
1869 *error
= -SCTP_IERROR_MALFORMED
;
1873 /********************************************************************
1874 * 3rd Level Abstractions
1875 ********************************************************************/
1877 struct __sctp_missing
{
1883 * Report a missing mandatory parameter.
1885 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1886 enum sctp_param paramtype
,
1887 struct sctp_chunk
*chunk
,
1888 struct sctp_chunk
**errp
)
1890 struct __sctp_missing report
;
1893 len
= SCTP_PAD4(sizeof(report
));
1895 /* Make an ERROR chunk, preparing enough room for
1896 * returning multiple unknown parameters.
1899 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1902 report
.num_missing
= htonl(1);
1903 report
.type
= paramtype
;
1904 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1906 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1909 /* Stop processing this chunk. */
1913 /* Report an Invalid Mandatory Parameter. */
1914 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1915 struct sctp_chunk
*chunk
,
1916 struct sctp_chunk
**errp
)
1918 /* Invalid Mandatory Parameter Error has no payload. */
1921 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1924 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1926 /* Stop processing this chunk. */
1930 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1931 struct sctp_paramhdr
*param
,
1932 const struct sctp_chunk
*chunk
,
1933 struct sctp_chunk
**errp
)
1935 /* This is a fatal error. Any accumulated non-fatal errors are
1939 sctp_chunk_free(*errp
);
1941 /* Create an error chunk and fill it in with our payload. */
1942 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1948 /* Do not attempt to handle the HOST_NAME parm. However, do
1949 * send back an indicator to the peer.
1951 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1952 union sctp_params param
,
1953 struct sctp_chunk
*chunk
,
1954 struct sctp_chunk
**errp
)
1956 __u16 len
= ntohs(param
.p
->length
);
1958 /* Processing of the HOST_NAME parameter will generate an
1959 * ABORT. If we've accumulated any non-fatal errors, they
1960 * would be unrecognized parameters and we should not include
1961 * them in the ABORT.
1964 sctp_chunk_free(*errp
);
1966 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1969 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1970 sctp_addto_chunk(*errp
, len
, param
.v
);
1973 /* Stop processing this chunk. */
1977 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1979 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
1980 int have_asconf
= 0;
1984 for (i
= 0; i
< num_ext
; i
++) {
1985 switch (param
.ext
->chunks
[i
]) {
1989 case SCTP_CID_ASCONF
:
1990 case SCTP_CID_ASCONF_ACK
:
1996 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1997 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1998 * only if ADD-IP is turned on and we are not backward-compatible
2001 if (net
->sctp
.addip_noauth
)
2004 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
2010 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2011 union sctp_params param
)
2013 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2014 struct net
*net
= sock_net(asoc
->base
.sk
);
2017 for (i
= 0; i
< num_ext
; i
++) {
2018 switch (param
.ext
->chunks
[i
]) {
2019 case SCTP_CID_RECONF
:
2020 if (asoc
->reconf_enable
&&
2021 !asoc
->peer
.reconf_capable
)
2022 asoc
->peer
.reconf_capable
= 1;
2024 case SCTP_CID_FWD_TSN
:
2025 if (asoc
->prsctp_enable
&& !asoc
->peer
.prsctp_capable
)
2026 asoc
->peer
.prsctp_capable
= 1;
2029 /* if the peer reports AUTH, assume that he
2032 if (asoc
->ep
->auth_enable
)
2033 asoc
->peer
.auth_capable
= 1;
2035 case SCTP_CID_ASCONF
:
2036 case SCTP_CID_ASCONF_ACK
:
2037 if (net
->sctp
.addip_enable
)
2038 asoc
->peer
.asconf_capable
= 1;
2046 /* RFC 3.2.1 & the Implementers Guide 2.2.
2048 * The Parameter Types are encoded such that the
2049 * highest-order two bits specify the action that must be
2050 * taken if the processing endpoint does not recognize the
2053 * 00 - Stop processing this parameter; do not process any further
2054 * parameters within this chunk
2056 * 01 - Stop processing this parameter, do not process any further
2057 * parameters within this chunk, and report the unrecognized
2058 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2060 * 10 - Skip this parameter and continue processing.
2062 * 11 - Skip this parameter and continue processing but
2063 * report the unrecognized parameter in an
2064 * 'Unrecognized Parameter' ERROR chunk.
2067 * SCTP_IERROR_NO_ERROR - continue with the chunk
2068 * SCTP_IERROR_ERROR - stop and report an error.
2069 * SCTP_IERROR_NOMEME - out of memory.
2071 static enum sctp_ierror
sctp_process_unk_param(
2072 const struct sctp_association
*asoc
,
2073 union sctp_params param
,
2074 struct sctp_chunk
*chunk
,
2075 struct sctp_chunk
**errp
)
2077 int retval
= SCTP_IERROR_NO_ERROR
;
2079 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2080 case SCTP_PARAM_ACTION_DISCARD
:
2081 retval
= SCTP_IERROR_ERROR
;
2083 case SCTP_PARAM_ACTION_SKIP
:
2085 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2086 retval
= SCTP_IERROR_ERROR
;
2088 case SCTP_PARAM_ACTION_SKIP_ERR
:
2089 /* Make an ERROR chunk, preparing enough room for
2090 * returning multiple unknown parameters.
2093 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2096 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2097 SCTP_PAD4(ntohs(param
.p
->length
))))
2098 sctp_addto_chunk_fixed(*errp
,
2099 SCTP_PAD4(ntohs(param
.p
->length
)),
2102 /* If there is no memory for generating the ERROR
2103 * report as specified, an ABORT will be triggered
2104 * to the peer and the association won't be
2107 retval
= SCTP_IERROR_NOMEM
;
2117 /* Verify variable length parameters
2119 * SCTP_IERROR_ABORT - trigger an ABORT
2120 * SCTP_IERROR_NOMEM - out of memory (abort)
2121 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2122 * SCTP_IERROR_NO_ERROR - continue with the chunk
2124 static enum sctp_ierror
sctp_verify_param(struct net
*net
,
2125 const struct sctp_endpoint
*ep
,
2126 const struct sctp_association
*asoc
,
2127 union sctp_params param
,
2129 struct sctp_chunk
*chunk
,
2130 struct sctp_chunk
**err_chunk
)
2132 struct sctp_hmac_algo_param
*hmacs
;
2133 int retval
= SCTP_IERROR_NO_ERROR
;
2134 __u16 n_elt
, id
= 0;
2137 /* FIXME - This routine is not looking at each parameter per the
2138 * chunk type, i.e., unrecognized parameters should be further
2139 * identified based on the chunk id.
2142 switch (param
.p
->type
) {
2143 case SCTP_PARAM_IPV4_ADDRESS
:
2144 case SCTP_PARAM_IPV6_ADDRESS
:
2145 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2146 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2147 case SCTP_PARAM_STATE_COOKIE
:
2148 case SCTP_PARAM_HEARTBEAT_INFO
:
2149 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2150 case SCTP_PARAM_ECN_CAPABLE
:
2151 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2154 case SCTP_PARAM_SUPPORTED_EXT
:
2155 if (!sctp_verify_ext_param(net
, param
))
2156 return SCTP_IERROR_ABORT
;
2159 case SCTP_PARAM_SET_PRIMARY
:
2160 if (net
->sctp
.addip_enable
)
2164 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2165 /* Tell the peer, we won't support this param. */
2166 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2167 retval
= SCTP_IERROR_ABORT
;
2170 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2171 if (ep
->prsctp_enable
)
2175 case SCTP_PARAM_RANDOM
:
2176 if (!ep
->auth_enable
)
2179 /* SCTP-AUTH: Secion 6.1
2180 * If the random number is not 32 byte long the association
2181 * MUST be aborted. The ABORT chunk SHOULD contain the error
2182 * cause 'Protocol Violation'.
2184 if (SCTP_AUTH_RANDOM_LENGTH
!=
2185 ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
)) {
2186 sctp_process_inv_paramlength(asoc
, param
.p
,
2188 retval
= SCTP_IERROR_ABORT
;
2192 case SCTP_PARAM_CHUNKS
:
2193 if (!ep
->auth_enable
)
2196 /* SCTP-AUTH: Section 3.2
2197 * The CHUNKS parameter MUST be included once in the INIT or
2198 * INIT-ACK chunk if the sender wants to receive authenticated
2199 * chunks. Its maximum length is 260 bytes.
2201 if (260 < ntohs(param
.p
->length
)) {
2202 sctp_process_inv_paramlength(asoc
, param
.p
,
2204 retval
= SCTP_IERROR_ABORT
;
2208 case SCTP_PARAM_HMAC_ALGO
:
2209 if (!ep
->auth_enable
)
2212 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2213 n_elt
= (ntohs(param
.p
->length
) -
2214 sizeof(struct sctp_paramhdr
)) >> 1;
2216 /* SCTP-AUTH: Section 6.1
2217 * The HMAC algorithm based on SHA-1 MUST be supported and
2218 * included in the HMAC-ALGO parameter.
2220 for (i
= 0; i
< n_elt
; i
++) {
2221 id
= ntohs(hmacs
->hmac_ids
[i
]);
2223 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2227 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2228 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2230 retval
= SCTP_IERROR_ABORT
;
2235 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2236 __func__
, ntohs(param
.p
->type
), cid
);
2238 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2244 /* Verify the INIT packet before we process it. */
2245 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2246 const struct sctp_association
*asoc
, enum sctp_cid cid
,
2247 struct sctp_init_chunk
*peer_init
,
2248 struct sctp_chunk
*chunk
, struct sctp_chunk
**errp
)
2250 union sctp_params param
;
2251 bool has_cookie
= false;
2254 /* Check for missing mandatory parameters. Note: Initial TSN is
2255 * also mandatory, but is not checked here since the valid range
2256 * is 0..2**32-1. RFC4960, section 3.3.3.
2258 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2259 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2260 peer_init
->init_hdr
.init_tag
== 0 ||
2261 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2262 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2264 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2265 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2269 /* There is a possibility that a parameter length was bad and
2270 * in that case we would have stoped walking the parameters.
2271 * The current param.p would point at the bad one.
2272 * Current consensus on the mailing list is to generate a PROTOCOL
2273 * VIOLATION error. We build the ERROR chunk here and let the normal
2274 * error handling code build and send the packet.
2276 if (param
.v
!= (void *)chunk
->chunk_end
)
2277 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2279 /* The only missing mandatory param possible today is
2280 * the state cookie for an INIT-ACK chunk.
2282 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2283 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2286 /* Verify all the variable length parameters */
2287 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2288 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2291 case SCTP_IERROR_ABORT
:
2292 case SCTP_IERROR_NOMEM
:
2294 case SCTP_IERROR_ERROR
:
2296 case SCTP_IERROR_NO_ERROR
:
2301 } /* for (loop through all parameters) */
2306 /* Unpack the parameters in an INIT packet into an association.
2307 * Returns 0 on failure, else success.
2308 * FIXME: This is an association method.
2310 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2311 const union sctp_addr
*peer_addr
,
2312 struct sctp_init_chunk
*peer_init
, gfp_t gfp
)
2314 struct net
*net
= sock_net(asoc
->base
.sk
);
2315 struct sctp_transport
*transport
;
2316 struct list_head
*pos
, *temp
;
2317 union sctp_params param
;
2318 union sctp_addr addr
;
2323 /* We must include the address that the INIT packet came from.
2324 * This is the only address that matters for an INIT packet.
2325 * When processing a COOKIE ECHO, we retrieve the from address
2326 * of the INIT from the cookie.
2329 /* This implementation defaults to making the first transport
2330 * added as the primary transport. The source address seems to
2331 * be a a better choice than any of the embedded addresses.
2333 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2336 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2339 /* Process the initialization parameters. */
2340 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2341 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2342 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2343 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2344 af
->from_addr_param(&addr
, param
.addr
,
2345 chunk
->sctp_hdr
->source
, 0);
2346 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2350 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2354 /* source address of chunk may not match any valid address */
2358 /* AUTH: After processing the parameters, make sure that we
2359 * have all the required info to potentially do authentications.
2361 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2362 !asoc
->peer
.peer_hmacs
))
2363 asoc
->peer
.auth_capable
= 0;
2365 /* In a non-backward compatible mode, if the peer claims
2366 * support for ADD-IP but not AUTH, the ADD-IP spec states
2367 * that we MUST ABORT the association. Section 6. The section
2368 * also give us an option to silently ignore the packet, which
2369 * is what we'll do here.
2371 if (!net
->sctp
.addip_noauth
&&
2372 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2373 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2375 SCTP_PARAM_SET_PRIMARY
);
2376 asoc
->peer
.asconf_capable
= 0;
2380 /* Walk list of transports, removing transports in the UNKNOWN state. */
2381 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2382 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2383 if (transport
->state
== SCTP_UNKNOWN
) {
2384 sctp_assoc_rm_peer(asoc
, transport
);
2388 /* The fixed INIT headers are always in network byte
2391 asoc
->peer
.i
.init_tag
=
2392 ntohl(peer_init
->init_hdr
.init_tag
);
2393 asoc
->peer
.i
.a_rwnd
=
2394 ntohl(peer_init
->init_hdr
.a_rwnd
);
2395 asoc
->peer
.i
.num_outbound_streams
=
2396 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2397 asoc
->peer
.i
.num_inbound_streams
=
2398 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2399 asoc
->peer
.i
.initial_tsn
=
2400 ntohl(peer_init
->init_hdr
.initial_tsn
);
2402 asoc
->strreset_inseq
= asoc
->peer
.i
.initial_tsn
;
2404 /* Apply the upper bounds for output streams based on peer's
2405 * number of inbound streams.
2407 if (asoc
->c
.sinit_num_ostreams
>
2408 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2409 asoc
->c
.sinit_num_ostreams
=
2410 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2413 if (asoc
->c
.sinit_max_instreams
>
2414 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2415 asoc
->c
.sinit_max_instreams
=
2416 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2419 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2420 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2422 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2423 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2425 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2426 cookie
= asoc
->peer
.cookie
;
2428 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2429 if (!asoc
->peer
.cookie
)
2433 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2434 * high (for example, implementations MAY use the size of the receiver
2435 * advertised window).
2437 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2439 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2442 /* Set up the TSN tracking pieces. */
2443 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2444 asoc
->peer
.i
.initial_tsn
, gfp
))
2447 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2449 * The stream sequence number in all the streams shall start
2450 * from 0 when the association is established. Also, when the
2451 * stream sequence number reaches the value 65535 the next
2452 * stream sequence number shall be set to 0.
2455 if (sctp_stream_init(&asoc
->stream
, asoc
->c
.sinit_num_ostreams
,
2456 asoc
->c
.sinit_max_instreams
, gfp
))
2459 if (!asoc
->temp
&& sctp_assoc_set_id(asoc
, gfp
))
2462 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2464 * When an endpoint has an ASCONF signaled change to be sent to the
2465 * remote endpoint it should do the following:
2467 * A2) A serial number should be assigned to the Chunk. The serial
2468 * number should be a monotonically increasing number. All serial
2469 * numbers are defined to be initialized at the start of the
2470 * association to the same value as the Initial TSN.
2472 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2476 /* Release the transport structures. */
2477 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2478 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2479 if (transport
->state
!= SCTP_ACTIVE
)
2480 sctp_assoc_rm_peer(asoc
, transport
);
2488 /* Update asoc with the option described in param.
2490 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2492 * asoc is the association to update.
2493 * param is the variable length parameter to use for update.
2494 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2495 * If the current packet is an INIT we want to minimize the amount of
2496 * work we do. In particular, we should not build transport
2497 * structures for the addresses.
2499 static int sctp_process_param(struct sctp_association
*asoc
,
2500 union sctp_params param
,
2501 const union sctp_addr
*peer_addr
,
2504 struct net
*net
= sock_net(asoc
->base
.sk
);
2505 struct sctp_endpoint
*ep
= asoc
->ep
;
2506 union sctp_addr_param
*addr_param
;
2507 struct sctp_transport
*t
;
2508 enum sctp_scope scope
;
2509 union sctp_addr addr
;
2515 /* We maintain all INIT parameters in network byte order all the
2516 * time. This allows us to not worry about whether the parameters
2517 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2519 switch (param
.p
->type
) {
2520 case SCTP_PARAM_IPV6_ADDRESS
:
2521 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2525 case SCTP_PARAM_IPV4_ADDRESS
:
2526 /* v4 addresses are not allowed on v6-only socket */
2527 if (ipv6_only_sock(asoc
->base
.sk
))
2530 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2531 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2532 scope
= sctp_scope(peer_addr
);
2533 if (sctp_in_scope(net
, &addr
, scope
))
2534 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2538 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2539 if (!net
->sctp
.cookie_preserve_enable
)
2542 stale
= ntohl(param
.life
->lifespan_increment
);
2544 /* Suggested Cookie Life span increment's unit is msec,
2547 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2550 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2551 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2554 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2555 /* Turn off the default values first so we'll know which
2556 * ones are really set by the peer.
2558 asoc
->peer
.ipv4_address
= 0;
2559 asoc
->peer
.ipv6_address
= 0;
2561 /* Assume that peer supports the address family
2562 * by which it sends a packet.
2564 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2565 asoc
->peer
.ipv6_address
= 1;
2566 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2567 asoc
->peer
.ipv4_address
= 1;
2569 /* Cycle through address types; avoid divide by 0. */
2570 sat
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2572 sat
/= sizeof(__u16
);
2574 for (i
= 0; i
< sat
; ++i
) {
2575 switch (param
.sat
->types
[i
]) {
2576 case SCTP_PARAM_IPV4_ADDRESS
:
2577 asoc
->peer
.ipv4_address
= 1;
2580 case SCTP_PARAM_IPV6_ADDRESS
:
2581 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2582 asoc
->peer
.ipv6_address
= 1;
2585 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2586 asoc
->peer
.hostname_address
= 1;
2589 default: /* Just ignore anything else. */
2595 case SCTP_PARAM_STATE_COOKIE
:
2596 asoc
->peer
.cookie_len
=
2597 ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2598 asoc
->peer
.cookie
= param
.cookie
->body
;
2601 case SCTP_PARAM_HEARTBEAT_INFO
:
2602 /* Would be odd to receive, but it causes no problems. */
2605 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2606 /* Rejected during verify stage. */
2609 case SCTP_PARAM_ECN_CAPABLE
:
2610 asoc
->peer
.ecn_capable
= 1;
2613 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2614 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2617 case SCTP_PARAM_SET_PRIMARY
:
2618 if (!net
->sctp
.addip_enable
)
2621 addr_param
= param
.v
+ sizeof(struct sctp_addip_param
);
2623 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2627 af
->from_addr_param(&addr
, addr_param
,
2628 htons(asoc
->peer
.port
), 0);
2630 /* if the address is invalid, we can't process it.
2631 * XXX: see spec for what to do.
2633 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2636 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2640 sctp_assoc_set_primary(asoc
, t
);
2643 case SCTP_PARAM_SUPPORTED_EXT
:
2644 sctp_process_ext_param(asoc
, param
);
2647 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2648 if (asoc
->prsctp_enable
) {
2649 asoc
->peer
.prsctp_capable
= 1;
2655 case SCTP_PARAM_RANDOM
:
2656 if (!ep
->auth_enable
)
2659 /* Save peer's random parameter */
2660 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2661 ntohs(param
.p
->length
), gfp
);
2662 if (!asoc
->peer
.peer_random
) {
2668 case SCTP_PARAM_HMAC_ALGO
:
2669 if (!ep
->auth_enable
)
2672 /* Save peer's HMAC list */
2673 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2674 ntohs(param
.p
->length
), gfp
);
2675 if (!asoc
->peer
.peer_hmacs
) {
2680 /* Set the default HMAC the peer requested*/
2681 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2684 case SCTP_PARAM_CHUNKS
:
2685 if (!ep
->auth_enable
)
2688 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2689 ntohs(param
.p
->length
), gfp
);
2690 if (!asoc
->peer
.peer_chunks
)
2695 /* Any unrecognized parameters should have been caught
2696 * and handled by sctp_verify_param() which should be
2697 * called prior to this routine. Simply log the error
2700 pr_debug("%s: ignoring param:%d for association:%p.\n",
2701 __func__
, ntohs(param
.p
->type
), asoc
);
2708 /* Select a new verification tag. */
2709 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2711 /* I believe that this random number generator complies with RFC1750.
2712 * A tag of 0 is reserved for special cases (e.g. INIT).
2717 get_random_bytes(&x
, sizeof(__u32
));
2723 /* Select an initial TSN to send during startup. */
2724 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2728 get_random_bytes(&retval
, sizeof(__u32
));
2733 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2735 * 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
2736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2737 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2738 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2740 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * | Address Parameter |
2742 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2743 * | ASCONF Parameter #1 |
2744 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * | ASCONF Parameter #N |
2750 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2752 * Address Parameter and other parameter will not be wrapped in this function
2754 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2755 union sctp_addr
*addr
,
2758 struct sctp_addiphdr asconf
;
2759 struct sctp_chunk
*retval
;
2760 int length
= sizeof(asconf
) + vparam_len
;
2761 union sctp_addr_param addrparam
;
2763 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2765 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2770 /* Create the chunk. */
2771 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2776 asconf
.serial
= htonl(asoc
->addip_serial
++);
2778 retval
->subh
.addip_hdr
=
2779 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2780 retval
->param_hdr
.v
=
2781 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2787 * 3.2.1 Add IP Address
2789 * 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
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | Type = 0xC001 | Length = Variable |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 * | ASCONF-Request Correlation ID |
2794 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2795 * | Address Parameter |
2796 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2798 * 3.2.2 Delete IP Address
2800 * 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
2801 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2802 * | Type = 0xC002 | Length = Variable |
2803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2804 * | ASCONF-Request Correlation ID |
2805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2806 * | Address Parameter |
2807 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2810 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2811 union sctp_addr
*laddr
,
2812 struct sockaddr
*addrs
,
2813 int addrcnt
, __be16 flags
)
2815 union sctp_addr_param addr_param
;
2816 struct sctp_addip_param param
;
2817 int paramlen
= sizeof(param
);
2818 struct sctp_chunk
*retval
;
2819 int addr_param_len
= 0;
2820 union sctp_addr
*addr
;
2821 int totallen
= 0, i
;
2826 /* Get total length of all the address parameters. */
2828 for (i
= 0; i
< addrcnt
; i
++) {
2830 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2831 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2833 totallen
+= paramlen
;
2834 totallen
+= addr_param_len
;
2836 addr_buf
+= af
->sockaddr_len
;
2837 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2838 /* reuse the parameter length from the same scope one */
2839 totallen
+= paramlen
;
2840 totallen
+= addr_param_len
;
2843 pr_debug("%s: picked same-scope del_pending addr, "
2844 "totallen for all addresses is %d\n",
2845 __func__
, totallen
);
2849 /* Create an asconf chunk with the required length. */
2850 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2854 /* Add the address parameters to the asconf chunk. */
2856 for (i
= 0; i
< addrcnt
; i
++) {
2858 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2859 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2860 param
.param_hdr
.type
= flags
;
2861 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2862 param
.crr_id
= htonl(i
);
2864 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2865 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2867 addr_buf
+= af
->sockaddr_len
;
2869 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2870 addr
= asoc
->asconf_addr_del_pending
;
2871 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2872 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2873 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2874 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2875 param
.crr_id
= htonl(i
);
2877 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2878 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2884 * 3.2.4 Set Primary IP Address
2886 * 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
2887 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2888 * | Type =0xC004 | Length = Variable |
2889 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2890 * | ASCONF-Request Correlation ID |
2891 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2892 * | Address Parameter |
2893 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * Create an ASCONF chunk with Set Primary IP address parameter.
2897 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2898 union sctp_addr
*addr
)
2900 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2901 union sctp_addr_param addrparam
;
2902 struct sctp_addip_param param
;
2903 struct sctp_chunk
*retval
;
2904 int len
= sizeof(param
);
2907 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2912 /* Create the chunk and make asconf header. */
2913 retval
= sctp_make_asconf(asoc
, addr
, len
);
2917 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2918 param
.param_hdr
.length
= htons(len
);
2921 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2922 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2927 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2929 * 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
2930 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2931 * | Type = 0x80 | Chunk Flags | Chunk Length |
2932 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2934 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * | ASCONF Parameter Response#1 |
2936 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2941 * | ASCONF Parameter Response#N |
2942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2946 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2947 __u32 serial
, int vparam_len
)
2949 struct sctp_addiphdr asconf
;
2950 struct sctp_chunk
*retval
;
2951 int length
= sizeof(asconf
) + vparam_len
;
2953 /* Create the chunk. */
2954 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2959 asconf
.serial
= htonl(serial
);
2961 retval
->subh
.addip_hdr
=
2962 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2967 /* Add response parameters to an ASCONF_ACK chunk. */
2968 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2970 struct sctp_addip_param
*asconf_param
)
2972 struct sctp_addip_param ack_param
;
2973 struct sctp_errhdr err_param
;
2974 int asconf_param_len
= 0;
2975 int err_param_len
= 0;
2976 __be16 response_type
;
2978 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2979 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2981 response_type
= SCTP_PARAM_ERR_CAUSE
;
2982 err_param_len
= sizeof(err_param
);
2985 ntohs(asconf_param
->param_hdr
.length
);
2988 /* Add Success Indication or Error Cause Indication parameter. */
2989 ack_param
.param_hdr
.type
= response_type
;
2990 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2993 ack_param
.crr_id
= crr_id
;
2994 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2996 if (SCTP_ERROR_NO_ERROR
== err_code
)
2999 /* Add Error Cause parameter. */
3000 err_param
.cause
= err_code
;
3001 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
3002 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
3004 /* Add the failed TLV copied from ASCONF chunk. */
3006 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3009 /* Process a asconf parameter. */
3010 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3011 struct sctp_chunk
*asconf
,
3012 struct sctp_addip_param
*asconf_param
)
3014 union sctp_addr_param
*addr_param
;
3015 struct sctp_transport
*peer
;
3016 union sctp_addr addr
;
3019 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3021 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3022 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3023 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3024 return SCTP_ERROR_UNKNOWN_PARAM
;
3026 switch (addr_param
->p
.type
) {
3027 case SCTP_PARAM_IPV6_ADDRESS
:
3028 if (!asoc
->peer
.ipv6_address
)
3029 return SCTP_ERROR_DNS_FAILED
;
3031 case SCTP_PARAM_IPV4_ADDRESS
:
3032 if (!asoc
->peer
.ipv4_address
)
3033 return SCTP_ERROR_DNS_FAILED
;
3036 return SCTP_ERROR_DNS_FAILED
;
3039 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3041 return SCTP_ERROR_DNS_FAILED
;
3043 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3045 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3046 * or multicast address.
3047 * (note: wildcard is permitted and requires special handling so
3048 * make sure we check for that)
3050 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3051 return SCTP_ERROR_DNS_FAILED
;
3053 switch (asconf_param
->param_hdr
.type
) {
3054 case SCTP_PARAM_ADD_IP
:
3056 * If the address 0.0.0.0 or ::0 is provided, the source
3057 * address of the packet MUST be added.
3059 if (af
->is_any(&addr
))
3060 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3062 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3063 * request and does not have the local resources to add this
3064 * new address to the association, it MUST return an Error
3065 * Cause TLV set to the new error code 'Operation Refused
3066 * Due to Resource Shortage'.
3069 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3071 return SCTP_ERROR_RSRC_LOW
;
3073 /* Start the heartbeat timer. */
3074 sctp_transport_reset_hb_timer(peer
);
3075 asoc
->new_transport
= peer
;
3077 case SCTP_PARAM_DEL_IP
:
3078 /* ADDIP 4.3 D7) If a request is received to delete the
3079 * last remaining IP address of a peer endpoint, the receiver
3080 * MUST send an Error Cause TLV with the error cause set to the
3081 * new error code 'Request to Delete Last Remaining IP Address'.
3083 if (asoc
->peer
.transport_count
== 1)
3084 return SCTP_ERROR_DEL_LAST_IP
;
3086 /* ADDIP 4.3 D8) If a request is received to delete an IP
3087 * address which is also the source address of the IP packet
3088 * which contained the ASCONF chunk, the receiver MUST reject
3089 * this request. To reject the request the receiver MUST send
3090 * an Error Cause TLV set to the new error code 'Request to
3091 * Delete Source IP Address'
3093 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3094 return SCTP_ERROR_DEL_SRC_IP
;
3097 * If the address 0.0.0.0 or ::0 is provided, all
3098 * addresses of the peer except the source address of the
3099 * packet MUST be deleted.
3101 if (af
->is_any(&addr
)) {
3102 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3103 sctp_assoc_del_nonprimary_peers(asoc
,
3105 return SCTP_ERROR_NO_ERROR
;
3108 /* If the address is not part of the association, the
3109 * ASCONF-ACK with Error Cause Indication Parameter
3110 * which including cause of Unresolvable Address should
3113 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3115 return SCTP_ERROR_DNS_FAILED
;
3117 sctp_assoc_rm_peer(asoc
, peer
);
3119 case SCTP_PARAM_SET_PRIMARY
:
3120 /* ADDIP Section 4.2.4
3121 * If the address 0.0.0.0 or ::0 is provided, the receiver
3122 * MAY mark the source address of the packet as its
3125 if (af
->is_any(&addr
))
3126 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3128 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3130 return SCTP_ERROR_DNS_FAILED
;
3132 sctp_assoc_set_primary(asoc
, peer
);
3136 return SCTP_ERROR_NO_ERROR
;
3139 /* Verify the ASCONF packet before we process it. */
3140 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3141 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3142 struct sctp_paramhdr
**errp
)
3144 struct sctp_addip_chunk
*addip
;
3145 bool addr_param_seen
= false;
3146 union sctp_params param
;
3148 addip
= (struct sctp_addip_chunk
*)chunk
->chunk_hdr
;
3149 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3150 size_t length
= ntohs(param
.p
->length
);
3153 switch (param
.p
->type
) {
3154 case SCTP_PARAM_ERR_CAUSE
:
3156 case SCTP_PARAM_IPV4_ADDRESS
:
3157 if (length
!= sizeof(struct sctp_ipv4addr_param
))
3159 /* ensure there is only one addr param and it's in the
3160 * beginning of addip_hdr params, or we reject it.
3162 if (param
.v
!= addip
->addip_hdr
.params
)
3164 addr_param_seen
= true;
3166 case SCTP_PARAM_IPV6_ADDRESS
:
3167 if (length
!= sizeof(struct sctp_ipv6addr_param
))
3169 if (param
.v
!= addip
->addip_hdr
.params
)
3171 addr_param_seen
= true;
3173 case SCTP_PARAM_ADD_IP
:
3174 case SCTP_PARAM_DEL_IP
:
3175 case SCTP_PARAM_SET_PRIMARY
:
3176 /* In ASCONF chunks, these need to be first. */
3177 if (addr_param_needed
&& !addr_param_seen
)
3179 length
= ntohs(param
.addip
->param_hdr
.length
);
3180 if (length
< sizeof(struct sctp_addip_param
) +
3184 case SCTP_PARAM_SUCCESS_REPORT
:
3185 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3186 if (length
!= sizeof(struct sctp_addip_param
))
3190 /* This is unkown to us, reject! */
3195 /* Remaining sanity checks. */
3196 if (addr_param_needed
&& !addr_param_seen
)
3198 if (!addr_param_needed
&& addr_param_seen
)
3200 if (param
.v
!= chunk
->chunk_end
)
3206 /* Process an incoming ASCONF chunk with the next expected serial no. and
3207 * return an ASCONF_ACK chunk to be sent in response.
3209 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3210 struct sctp_chunk
*asconf
)
3212 union sctp_addr_param
*addr_param
;
3213 struct sctp_addip_chunk
*addip
;
3214 struct sctp_chunk
*asconf_ack
;
3215 bool all_param_pass
= true;
3216 struct sctp_addiphdr
*hdr
;
3217 int length
= 0, chunk_len
;
3218 union sctp_params param
;
3222 addip
= (struct sctp_addip_chunk
*)asconf
->chunk_hdr
;
3223 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) -
3224 sizeof(struct sctp_chunkhdr
);
3225 hdr
= (struct sctp_addiphdr
*)asconf
->skb
->data
;
3226 serial
= ntohl(hdr
->serial
);
3228 /* Skip the addiphdr and store a pointer to address parameter. */
3229 length
= sizeof(*hdr
);
3230 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3231 chunk_len
-= length
;
3233 /* Skip the address parameter and store a pointer to the first
3236 length
= ntohs(addr_param
->p
.length
);
3237 chunk_len
-= length
;
3239 /* create an ASCONF_ACK chunk.
3240 * Based on the definitions of parameters, we know that the size of
3241 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3244 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3248 /* Process the TLVs contained within the ASCONF chunk. */
3249 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3250 /* Skip preceeding address parameters. */
3251 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3252 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3255 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3258 * If an error response is received for a TLV parameter,
3259 * all TLVs with no response before the failed TLV are
3260 * considered successful if not reported. All TLVs after
3261 * the failed response are considered unsuccessful unless
3262 * a specific success indication is present for the parameter.
3264 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3265 all_param_pass
= false;
3266 if (!all_param_pass
)
3267 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3268 err_code
, param
.addip
);
3270 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3271 * an IP address sends an 'Out of Resource' in its response, it
3272 * MUST also fail any subsequent add or delete requests bundled
3275 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3279 asoc
->peer
.addip_serial
++;
3281 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3282 * after freeing the reference to old asconf ack if any.
3285 sctp_chunk_hold(asconf_ack
);
3286 list_add_tail(&asconf_ack
->transmitted_list
,
3287 &asoc
->asconf_ack_list
);
3293 /* Process a asconf parameter that is successfully acked. */
3294 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3295 struct sctp_addip_param
*asconf_param
)
3297 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3298 union sctp_addr_param
*addr_param
;
3299 struct sctp_sockaddr_entry
*saddr
;
3300 struct sctp_transport
*transport
;
3301 union sctp_addr addr
;
3304 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3306 /* We have checked the packet before, so we do not check again. */
3307 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3308 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3310 switch (asconf_param
->param_hdr
.type
) {
3311 case SCTP_PARAM_ADD_IP
:
3312 /* This is always done in BH context with a socket lock
3313 * held, so the list can not change.
3316 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3317 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3318 saddr
->state
= SCTP_ADDR_SRC
;
3321 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3323 sctp_transport_dst_release(transport
);
3326 case SCTP_PARAM_DEL_IP
:
3328 sctp_del_bind_addr(bp
, &addr
);
3329 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3330 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3331 kfree(asoc
->asconf_addr_del_pending
);
3332 asoc
->asconf_addr_del_pending
= NULL
;
3335 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3337 sctp_transport_dst_release(transport
);
3345 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3346 * for the given asconf parameter. If there is no response for this parameter,
3347 * return the error code based on the third argument 'no_err'.
3349 * A7) If an error response is received for a TLV parameter, all TLVs with no
3350 * response before the failed TLV are considered successful if not reported.
3351 * All TLVs after the failed response are considered unsuccessful unless a
3352 * specific success indication is present for the parameter.
3354 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3355 struct sctp_addip_param
*asconf_param
,
3358 struct sctp_addip_param
*asconf_ack_param
;
3359 struct sctp_errhdr
*err_param
;
3365 err_code
= SCTP_ERROR_NO_ERROR
;
3367 err_code
= SCTP_ERROR_REQ_REFUSED
;
3369 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3370 sizeof(struct sctp_chunkhdr
);
3372 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3373 * the first asconf_ack parameter.
3375 length
= sizeof(struct sctp_addiphdr
);
3376 asconf_ack_param
= (struct sctp_addip_param
*)(asconf_ack
->skb
->data
+
3378 asconf_ack_len
-= length
;
3380 while (asconf_ack_len
> 0) {
3381 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3382 switch (asconf_ack_param
->param_hdr
.type
) {
3383 case SCTP_PARAM_SUCCESS_REPORT
:
3384 return SCTP_ERROR_NO_ERROR
;
3385 case SCTP_PARAM_ERR_CAUSE
:
3386 length
= sizeof(*asconf_ack_param
);
3387 err_param
= (void *)asconf_ack_param
+ length
;
3388 asconf_ack_len
-= length
;
3389 if (asconf_ack_len
> 0)
3390 return err_param
->cause
;
3392 return SCTP_ERROR_INV_PARAM
;
3395 return SCTP_ERROR_INV_PARAM
;
3399 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3400 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3401 asconf_ack_len
-= length
;
3407 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3408 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3409 struct sctp_chunk
*asconf_ack
)
3411 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3412 struct sctp_addip_param
*asconf_param
;
3413 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3414 union sctp_addr_param
*addr_param
;
3415 int asconf_len
= asconf
->skb
->len
;
3416 int all_param_pass
= 0;
3421 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3422 * a pointer to address parameter.
3424 length
= sizeof(struct sctp_addip_chunk
);
3425 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3426 asconf_len
-= length
;
3428 /* Skip the address parameter in the last asconf sent and store a
3429 * pointer to the first asconf parameter.
3431 length
= ntohs(addr_param
->p
.length
);
3432 asconf_param
= (void *)addr_param
+ length
;
3433 asconf_len
-= length
;
3436 * A8) If there is no response(s) to specific TLV parameter(s), and no
3437 * failures are indicated, then all request(s) are considered
3440 if (asconf_ack
->skb
->len
== sizeof(struct sctp_addiphdr
))
3443 /* Process the TLVs contained in the last sent ASCONF chunk. */
3444 while (asconf_len
> 0) {
3446 err_code
= SCTP_ERROR_NO_ERROR
;
3448 err_code
= sctp_get_asconf_response(asconf_ack
,
3451 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3456 case SCTP_ERROR_NO_ERROR
:
3457 sctp_asconf_param_success(asoc
, asconf_param
);
3460 case SCTP_ERROR_RSRC_LOW
:
3464 case SCTP_ERROR_UNKNOWN_PARAM
:
3465 /* Disable sending this type of asconf parameter in
3468 asoc
->peer
.addip_disabled_mask
|=
3469 asconf_param
->param_hdr
.type
;
3472 case SCTP_ERROR_REQ_REFUSED
:
3473 case SCTP_ERROR_DEL_LAST_IP
:
3474 case SCTP_ERROR_DEL_SRC_IP
:
3479 /* Skip the processed asconf parameter and move to the next
3482 length
= ntohs(asconf_param
->param_hdr
.length
);
3483 asconf_param
= (void *)asconf_param
+ length
;
3484 asconf_len
-= length
;
3487 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3488 asoc
->src_out_of_asoc_ok
= 0;
3489 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3492 /* Free the cached last sent asconf chunk. */
3493 list_del_init(&asconf
->transmitted_list
);
3494 sctp_chunk_free(asconf
);
3495 asoc
->addip_last_asconf
= NULL
;
3500 /* Make a FWD TSN chunk. */
3501 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3502 __u32 new_cum_tsn
, size_t nstreams
,
3503 struct sctp_fwdtsn_skip
*skiplist
)
3505 struct sctp_chunk
*retval
= NULL
;
3506 struct sctp_fwdtsn_hdr ftsn_hdr
;
3507 struct sctp_fwdtsn_skip skip
;
3511 hint
= (nstreams
+ 1) * sizeof(__u32
);
3513 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3518 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3519 retval
->subh
.fwdtsn_hdr
=
3520 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3522 for (i
= 0; i
< nstreams
; i
++) {
3523 skip
.stream
= skiplist
[i
].stream
;
3524 skip
.ssn
= skiplist
[i
].ssn
;
3525 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);
3531 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3533 * 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
3534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3535 * | Type = 130 | Chunk Flags | Chunk Length |
3536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3538 * / Re-configuration Parameter /
3540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3542 * / Re-configuration Parameter (optional) /
3544 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3546 static struct sctp_chunk
*sctp_make_reconf(const struct sctp_association
*asoc
,
3549 struct sctp_reconf_chunk
*reconf
;
3550 struct sctp_chunk
*retval
;
3552 retval
= sctp_make_control(asoc
, SCTP_CID_RECONF
, 0, length
,
3557 reconf
= (struct sctp_reconf_chunk
*)retval
->chunk_hdr
;
3558 retval
->param_hdr
.v
= reconf
->params
;
3563 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3565 * 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
3566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3567 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3569 * | Re-configuration Request Sequence Number |
3570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3571 * | Re-configuration Response Sequence Number |
3572 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3573 * | Sender's Last Assigned TSN |
3574 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3575 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3576 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3578 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3579 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3580 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3582 * RE-CONFIG 4.2 (STREAM IN RESET)
3584 * 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
3585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3586 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * | Re-configuration Request Sequence Number |
3589 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3590 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3591 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3593 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3594 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3595 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3597 struct sctp_chunk
*sctp_make_strreset_req(
3598 const struct sctp_association
*asoc
,
3599 __u16 stream_num
, __be16
*stream_list
,
3602 __u16 stream_len
= stream_num
* sizeof(__u16
);
3603 struct sctp_strreset_outreq outreq
;
3604 struct sctp_strreset_inreq inreq
;
3605 struct sctp_chunk
*retval
;
3606 __u16 outlen
, inlen
;
3608 outlen
= (sizeof(outreq
) + stream_len
) * out
;
3609 inlen
= (sizeof(inreq
) + stream_len
) * in
;
3611 retval
= sctp_make_reconf(asoc
, outlen
+ inlen
);
3616 outreq
.param_hdr
.type
= SCTP_PARAM_RESET_OUT_REQUEST
;
3617 outreq
.param_hdr
.length
= htons(outlen
);
3618 outreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3619 outreq
.response_seq
= htonl(asoc
->strreset_inseq
- 1);
3620 outreq
.send_reset_at_tsn
= htonl(asoc
->next_tsn
- 1);
3622 sctp_addto_chunk(retval
, sizeof(outreq
), &outreq
);
3625 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3629 inreq
.param_hdr
.type
= SCTP_PARAM_RESET_IN_REQUEST
;
3630 inreq
.param_hdr
.length
= htons(inlen
);
3631 inreq
.request_seq
= htonl(asoc
->strreset_outseq
+ out
);
3633 sctp_addto_chunk(retval
, sizeof(inreq
), &inreq
);
3636 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3642 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3644 * 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
3645 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3646 * | Parameter Type = 15 | Parameter Length = 8 |
3647 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3648 * | Re-configuration Request Sequence Number |
3649 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3651 struct sctp_chunk
*sctp_make_strreset_tsnreq(
3652 const struct sctp_association
*asoc
)
3654 struct sctp_strreset_tsnreq tsnreq
;
3655 __u16 length
= sizeof(tsnreq
);
3656 struct sctp_chunk
*retval
;
3658 retval
= sctp_make_reconf(asoc
, length
);
3662 tsnreq
.param_hdr
.type
= SCTP_PARAM_RESET_TSN_REQUEST
;
3663 tsnreq
.param_hdr
.length
= htons(length
);
3664 tsnreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3666 sctp_addto_chunk(retval
, sizeof(tsnreq
), &tsnreq
);
3671 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3673 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
3674 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3675 * | Parameter Type = 17 | Parameter Length = 12 |
3676 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3677 * | Re-configuration Request Sequence Number |
3678 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3679 * | Number of new streams | Reserved |
3680 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3682 struct sctp_chunk
*sctp_make_strreset_addstrm(
3683 const struct sctp_association
*asoc
,
3684 __u16 out
, __u16 in
)
3686 struct sctp_strreset_addstrm addstrm
;
3687 __u16 size
= sizeof(addstrm
);
3688 struct sctp_chunk
*retval
;
3690 retval
= sctp_make_reconf(asoc
, (!!out
+ !!in
) * size
);
3695 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_OUT_STREAMS
;
3696 addstrm
.param_hdr
.length
= htons(size
);
3697 addstrm
.number_of_streams
= htons(out
);
3698 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
);
3699 addstrm
.reserved
= 0;
3701 sctp_addto_chunk(retval
, size
, &addstrm
);
3705 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_IN_STREAMS
;
3706 addstrm
.param_hdr
.length
= htons(size
);
3707 addstrm
.number_of_streams
= htons(in
);
3708 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
+ !!out
);
3709 addstrm
.reserved
= 0;
3711 sctp_addto_chunk(retval
, size
, &addstrm
);
3717 /* RE-CONFIG 4.4 (RESP)
3719 * 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
3720 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3721 * | Parameter Type = 16 | Parameter Length |
3722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3723 * | Re-configuration Response Sequence Number |
3724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3728 struct sctp_chunk
*sctp_make_strreset_resp(const struct sctp_association
*asoc
,
3729 __u32 result
, __u32 sn
)
3731 struct sctp_strreset_resp resp
;
3732 __u16 length
= sizeof(resp
);
3733 struct sctp_chunk
*retval
;
3735 retval
= sctp_make_reconf(asoc
, length
);
3739 resp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3740 resp
.param_hdr
.length
= htons(length
);
3741 resp
.response_seq
= htonl(sn
);
3742 resp
.result
= htonl(result
);
3744 sctp_addto_chunk(retval
, sizeof(resp
), &resp
);
3749 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3751 * 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
3752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3753 * | Parameter Type = 16 | Parameter Length |
3754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3755 * | Re-configuration Response Sequence Number |
3756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3759 * | Sender's Next TSN (optional) |
3760 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3761 * | Receiver's Next TSN (optional) |
3762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3764 struct sctp_chunk
*sctp_make_strreset_tsnresp(struct sctp_association
*asoc
,
3765 __u32 result
, __u32 sn
,
3769 struct sctp_strreset_resptsn tsnresp
;
3770 __u16 length
= sizeof(tsnresp
);
3771 struct sctp_chunk
*retval
;
3773 retval
= sctp_make_reconf(asoc
, length
);
3777 tsnresp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3778 tsnresp
.param_hdr
.length
= htons(length
);
3780 tsnresp
.response_seq
= htonl(sn
);
3781 tsnresp
.result
= htonl(result
);
3782 tsnresp
.senders_next_tsn
= htonl(sender_tsn
);
3783 tsnresp
.receivers_next_tsn
= htonl(receiver_tsn
);
3785 sctp_addto_chunk(retval
, sizeof(tsnresp
), &tsnresp
);
3790 bool sctp_verify_reconf(const struct sctp_association
*asoc
,
3791 struct sctp_chunk
*chunk
,
3792 struct sctp_paramhdr
**errp
)
3794 struct sctp_reconf_chunk
*hdr
;
3795 union sctp_params param
;
3799 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
3800 sctp_walk_params(param
, hdr
, params
) {
3801 __u16 length
= ntohs(param
.p
->length
);
3806 switch (param
.p
->type
) {
3807 case SCTP_PARAM_RESET_OUT_REQUEST
:
3808 if (length
< sizeof(struct sctp_strreset_outreq
) ||
3809 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3810 last
!= SCTP_PARAM_RESET_IN_REQUEST
))
3813 case SCTP_PARAM_RESET_IN_REQUEST
:
3814 if (length
< sizeof(struct sctp_strreset_inreq
) ||
3815 (last
&& last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3818 case SCTP_PARAM_RESET_RESPONSE
:
3819 if ((length
!= sizeof(struct sctp_strreset_resp
) &&
3820 length
!= sizeof(struct sctp_strreset_resptsn
)) ||
3821 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3822 last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3825 case SCTP_PARAM_RESET_TSN_REQUEST
:
3827 sizeof(struct sctp_strreset_tsnreq
) || last
)
3830 case SCTP_PARAM_RESET_ADD_IN_STREAMS
:
3831 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3832 (last
&& last
!= SCTP_PARAM_RESET_ADD_OUT_STREAMS
))
3835 case SCTP_PARAM_RESET_ADD_OUT_STREAMS
:
3836 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3837 (last
&& last
!= SCTP_PARAM_RESET_ADD_IN_STREAMS
))
3844 last
= param
.p
->type
;