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
;
1382 /* No need to allocate LL here, as this is only a chunk. */
1383 skb
= alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr
) + paylen
), gfp
);
1387 /* Make room for the chunk header. */
1388 chunk_hdr
= (struct sctp_chunkhdr
*)skb_put(skb
, sizeof(*chunk_hdr
));
1389 chunk_hdr
->type
= type
;
1390 chunk_hdr
->flags
= flags
;
1391 chunk_hdr
->length
= htons(sizeof(*chunk_hdr
));
1393 sk
= asoc
? asoc
->base
.sk
: NULL
;
1394 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1400 retval
->chunk_hdr
= chunk_hdr
;
1401 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(*chunk_hdr
);
1403 /* Determine if the chunk needs to be authenticated */
1404 if (sctp_auth_send_cid(type
, asoc
))
1412 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1413 __u8 flags
, int paylen
, gfp_t gfp
)
1415 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1418 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1419 __u8 type
, __u8 flags
, int paylen
,
1422 struct sctp_chunk
*chunk
;
1424 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1426 sctp_control_set_owner_w(chunk
);
1431 /* Release the memory occupied by a chunk. */
1432 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1434 BUG_ON(!list_empty(&chunk
->list
));
1435 list_del_init(&chunk
->transmitted_list
);
1437 consume_skb(chunk
->skb
);
1438 consume_skb(chunk
->auth_chunk
);
1440 SCTP_DBG_OBJCNT_DEC(chunk
);
1441 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1444 /* Possibly, free the chunk. */
1445 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1447 /* Release our reference on the message tracker. */
1449 sctp_datamsg_put(chunk
->msg
);
1451 sctp_chunk_put(chunk
);
1454 /* Grab a reference to the chunk. */
1455 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1457 refcount_inc(&ch
->refcnt
);
1460 /* Release a reference to the chunk. */
1461 void sctp_chunk_put(struct sctp_chunk
*ch
)
1463 if (refcount_dec_and_test(&ch
->refcnt
))
1464 sctp_chunk_destroy(ch
);
1467 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1470 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1472 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1473 int padlen
= SCTP_PAD4(chunklen
) - chunklen
;
1476 skb_put_zero(chunk
->skb
, padlen
);
1477 target
= skb_put_data(chunk
->skb
, data
, len
);
1479 /* Adjust the chunk length field. */
1480 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1481 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1486 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1487 * space in the chunk
1489 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1490 int len
, const void *data
)
1492 if (skb_tailroom(chunk
->skb
) >= len
)
1493 return sctp_addto_chunk(chunk
, len
, data
);
1498 /* Append bytes from user space to the end of a chunk. Will panic if
1499 * chunk is not big enough.
1500 * Returns a kernel err value.
1502 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1503 struct iov_iter
*from
)
1507 /* Make room in chunk for data. */
1508 target
= skb_put(chunk
->skb
, len
);
1510 /* Copy data (whole iovec) into chunk */
1511 if (!copy_from_iter_full(target
, len
, from
))
1514 /* Adjust the chunk length field. */
1515 chunk
->chunk_hdr
->length
=
1516 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1517 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1522 /* Helper function to assign a TSN if needed. This assumes that both
1523 * the data_hdr and association have already been assigned.
1525 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1527 struct sctp_stream
*stream
;
1528 struct sctp_chunk
*lchunk
;
1529 struct sctp_datamsg
*msg
;
1535 /* All fragments will be on the same stream */
1536 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1537 stream
= &chunk
->asoc
->stream
;
1539 /* Now assign the sequence number to the entire message.
1540 * All fragments must have the same stream sequence number.
1543 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1544 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1547 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1548 ssn
= sctp_ssn_next(stream
, out
, sid
);
1550 ssn
= sctp_ssn_peek(stream
, out
, sid
);
1553 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1554 lchunk
->has_ssn
= 1;
1558 /* Helper function to assign a TSN if needed. This assumes that both
1559 * the data_hdr and association have already been assigned.
1561 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1563 if (!chunk
->has_tsn
) {
1564 /* This is the last possible instant to
1567 chunk
->subh
.data_hdr
->tsn
=
1568 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1573 /* Create a CLOSED association to use with an incoming packet. */
1574 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1575 struct sctp_chunk
*chunk
,
1578 struct sctp_association
*asoc
;
1579 enum sctp_scope scope
;
1580 struct sk_buff
*skb
;
1582 /* Create the bare association. */
1583 scope
= sctp_scope(sctp_source(chunk
));
1584 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1589 /* Create an entry for the source address of the packet. */
1590 SCTP_INPUT_CB(skb
)->af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1596 /* Build a cookie representing asoc.
1597 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1599 static struct sctp_cookie_param
*sctp_pack_cookie(
1600 const struct sctp_endpoint
*ep
,
1601 const struct sctp_association
*asoc
,
1602 const struct sctp_chunk
*init_chunk
,
1603 int *cookie_len
, const __u8
*raw_addrs
,
1606 struct sctp_signed_cookie
*cookie
;
1607 struct sctp_cookie_param
*retval
;
1608 int headersize
, bodysize
;
1610 /* Header size is static data prior to the actual cookie, including
1613 headersize
= sizeof(struct sctp_paramhdr
) +
1614 (sizeof(struct sctp_signed_cookie
) -
1615 sizeof(struct sctp_cookie
));
1616 bodysize
= sizeof(struct sctp_cookie
)
1617 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1619 /* Pad out the cookie to a multiple to make the signature
1620 * functions simpler to write.
1622 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1623 bodysize
+= SCTP_COOKIE_MULTIPLE
1624 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1625 *cookie_len
= headersize
+ bodysize
;
1627 /* Clear this memory since we are sending this data structure
1628 * out on the network.
1630 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1634 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1636 /* Set up the parameter header. */
1637 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1638 retval
->p
.length
= htons(*cookie_len
);
1640 /* Copy the cookie part of the association itself. */
1641 cookie
->c
= asoc
->c
;
1642 /* Save the raw address list length in the cookie. */
1643 cookie
->c
.raw_addr_list_len
= addrs_len
;
1645 /* Remember PR-SCTP capability. */
1646 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1648 /* Save adaptation indication in the cookie. */
1649 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1651 /* Set an expiration time for the cookie. */
1652 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1655 /* Copy the peer's init packet. */
1656 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1657 ntohs(init_chunk
->chunk_hdr
->length
));
1659 /* Copy the raw local address list of the association. */
1660 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1661 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1663 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1664 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1667 /* Sign the message. */
1668 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1671 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1672 sizeof(ep
->secret_key
)) ?:
1673 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1675 shash_desc_zero(desc
);
1689 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1690 struct sctp_association
*sctp_unpack_cookie(
1691 const struct sctp_endpoint
*ep
,
1692 const struct sctp_association
*asoc
,
1693 struct sctp_chunk
*chunk
, gfp_t gfp
,
1694 int *error
, struct sctp_chunk
**errp
)
1696 struct sctp_association
*retval
= NULL
;
1697 int headersize
, bodysize
, fixed_size
;
1698 struct sctp_signed_cookie
*cookie
;
1699 struct sk_buff
*skb
= chunk
->skb
;
1700 struct sctp_cookie
*bear_cookie
;
1701 __u8
*digest
= ep
->digest
;
1702 enum sctp_scope scope
;
1706 /* Header size is static data prior to the actual cookie, including
1709 headersize
= sizeof(struct sctp_chunkhdr
) +
1710 (sizeof(struct sctp_signed_cookie
) -
1711 sizeof(struct sctp_cookie
));
1712 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1713 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1715 /* Verify that the chunk looks like it even has a cookie.
1716 * There must be enough room for our cookie and our peer's
1719 len
= ntohs(chunk
->chunk_hdr
->length
);
1720 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1723 /* Verify that the cookie has been padded out. */
1724 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1727 /* Process the cookie. */
1728 cookie
= chunk
->subh
.cookie_hdr
;
1729 bear_cookie
= &cookie
->c
;
1731 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1734 /* Check the signature. */
1736 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1739 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1742 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1743 sizeof(ep
->secret_key
)) ?:
1744 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1746 shash_desc_zero(desc
);
1749 *error
= -SCTP_IERROR_NOMEM
;
1754 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1755 *error
= -SCTP_IERROR_BAD_SIG
;
1760 /* IG Section 2.35.2:
1761 * 3) Compare the port numbers and the verification tag contained
1762 * within the COOKIE ECHO chunk to the actual port numbers and the
1763 * verification tag within the SCTP common header of the received
1764 * packet. If these values do not match the packet MUST be silently
1767 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1768 *error
= -SCTP_IERROR_BAD_TAG
;
1772 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1773 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1774 *error
= -SCTP_IERROR_BAD_PORTS
;
1778 /* Check to see if the cookie is stale. If there is already
1779 * an association, there is no need to check cookie's expiration
1780 * for init collision case of lost COOKIE ACK.
1781 * If skb has been timestamped, then use the stamp, otherwise
1782 * use current time. This introduces a small possibility that
1783 * that a cookie may be considered expired, but his would only slow
1784 * down the new association establishment instead of every packet.
1786 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1787 kt
= skb_get_ktime(skb
);
1789 kt
= ktime_get_real();
1791 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1793 * Section 3.3.10.3 Stale Cookie Error (3)
1797 * Stale Cookie Error: Indicates the receipt of a valid State
1798 * Cookie that has expired.
1800 len
= ntohs(chunk
->chunk_hdr
->length
);
1801 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1803 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1804 __be32 n
= htonl(usecs
);
1806 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1808 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1809 *error
= -SCTP_IERROR_STALE_COOKIE
;
1811 *error
= -SCTP_IERROR_NOMEM
;
1816 /* Make a new base association. */
1817 scope
= sctp_scope(sctp_source(chunk
));
1818 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1820 *error
= -SCTP_IERROR_NOMEM
;
1824 /* Set up our peer's port number. */
1825 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1827 /* Populate the association from the cookie. */
1828 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1830 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1832 *error
= -SCTP_IERROR_NOMEM
;
1836 /* Also, add the destination address. */
1837 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1838 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1839 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1843 retval
->next_tsn
= retval
->c
.initial_tsn
;
1844 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1845 retval
->addip_serial
= retval
->c
.initial_tsn
;
1846 retval
->strreset_outseq
= retval
->c
.initial_tsn
;
1847 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1848 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1849 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1851 /* The INIT stuff will be done by the side effects. */
1856 sctp_association_free(retval
);
1861 /* Yikes! The packet is either corrupt or deliberately
1864 *error
= -SCTP_IERROR_MALFORMED
;
1868 /********************************************************************
1869 * 3rd Level Abstractions
1870 ********************************************************************/
1872 struct __sctp_missing
{
1878 * Report a missing mandatory parameter.
1880 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1881 enum sctp_param paramtype
,
1882 struct sctp_chunk
*chunk
,
1883 struct sctp_chunk
**errp
)
1885 struct __sctp_missing report
;
1888 len
= SCTP_PAD4(sizeof(report
));
1890 /* Make an ERROR chunk, preparing enough room for
1891 * returning multiple unknown parameters.
1894 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1897 report
.num_missing
= htonl(1);
1898 report
.type
= paramtype
;
1899 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1901 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1904 /* Stop processing this chunk. */
1908 /* Report an Invalid Mandatory Parameter. */
1909 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1910 struct sctp_chunk
*chunk
,
1911 struct sctp_chunk
**errp
)
1913 /* Invalid Mandatory Parameter Error has no payload. */
1916 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1919 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1921 /* Stop processing this chunk. */
1925 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1926 struct sctp_paramhdr
*param
,
1927 const struct sctp_chunk
*chunk
,
1928 struct sctp_chunk
**errp
)
1930 /* This is a fatal error. Any accumulated non-fatal errors are
1934 sctp_chunk_free(*errp
);
1936 /* Create an error chunk and fill it in with our payload. */
1937 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1943 /* Do not attempt to handle the HOST_NAME parm. However, do
1944 * send back an indicator to the peer.
1946 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1947 union sctp_params param
,
1948 struct sctp_chunk
*chunk
,
1949 struct sctp_chunk
**errp
)
1951 __u16 len
= ntohs(param
.p
->length
);
1953 /* Processing of the HOST_NAME parameter will generate an
1954 * ABORT. If we've accumulated any non-fatal errors, they
1955 * would be unrecognized parameters and we should not include
1956 * them in the ABORT.
1959 sctp_chunk_free(*errp
);
1961 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1964 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1965 sctp_addto_chunk(*errp
, len
, param
.v
);
1968 /* Stop processing this chunk. */
1972 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1974 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
1975 int have_asconf
= 0;
1979 for (i
= 0; i
< num_ext
; i
++) {
1980 switch (param
.ext
->chunks
[i
]) {
1984 case SCTP_CID_ASCONF
:
1985 case SCTP_CID_ASCONF_ACK
:
1991 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1992 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1993 * only if ADD-IP is turned on and we are not backward-compatible
1996 if (net
->sctp
.addip_noauth
)
1999 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
2005 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2006 union sctp_params param
)
2008 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2009 struct net
*net
= sock_net(asoc
->base
.sk
);
2012 for (i
= 0; i
< num_ext
; i
++) {
2013 switch (param
.ext
->chunks
[i
]) {
2014 case SCTP_CID_RECONF
:
2015 if (asoc
->reconf_enable
&&
2016 !asoc
->peer
.reconf_capable
)
2017 asoc
->peer
.reconf_capable
= 1;
2019 case SCTP_CID_FWD_TSN
:
2020 if (asoc
->prsctp_enable
&& !asoc
->peer
.prsctp_capable
)
2021 asoc
->peer
.prsctp_capable
= 1;
2024 /* if the peer reports AUTH, assume that he
2027 if (asoc
->ep
->auth_enable
)
2028 asoc
->peer
.auth_capable
= 1;
2030 case SCTP_CID_ASCONF
:
2031 case SCTP_CID_ASCONF_ACK
:
2032 if (net
->sctp
.addip_enable
)
2033 asoc
->peer
.asconf_capable
= 1;
2041 /* RFC 3.2.1 & the Implementers Guide 2.2.
2043 * The Parameter Types are encoded such that the
2044 * highest-order two bits specify the action that must be
2045 * taken if the processing endpoint does not recognize the
2048 * 00 - Stop processing this parameter; do not process any further
2049 * parameters within this chunk
2051 * 01 - Stop processing this parameter, do not process any further
2052 * parameters within this chunk, and report the unrecognized
2053 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2055 * 10 - Skip this parameter and continue processing.
2057 * 11 - Skip this parameter and continue processing but
2058 * report the unrecognized parameter in an
2059 * 'Unrecognized Parameter' ERROR chunk.
2062 * SCTP_IERROR_NO_ERROR - continue with the chunk
2063 * SCTP_IERROR_ERROR - stop and report an error.
2064 * SCTP_IERROR_NOMEME - out of memory.
2066 static enum sctp_ierror
sctp_process_unk_param(
2067 const struct sctp_association
*asoc
,
2068 union sctp_params param
,
2069 struct sctp_chunk
*chunk
,
2070 struct sctp_chunk
**errp
)
2072 int retval
= SCTP_IERROR_NO_ERROR
;
2074 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2075 case SCTP_PARAM_ACTION_DISCARD
:
2076 retval
= SCTP_IERROR_ERROR
;
2078 case SCTP_PARAM_ACTION_SKIP
:
2080 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2081 retval
= SCTP_IERROR_ERROR
;
2083 case SCTP_PARAM_ACTION_SKIP_ERR
:
2084 /* Make an ERROR chunk, preparing enough room for
2085 * returning multiple unknown parameters.
2088 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2091 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2092 SCTP_PAD4(ntohs(param
.p
->length
))))
2093 sctp_addto_chunk_fixed(*errp
,
2094 SCTP_PAD4(ntohs(param
.p
->length
)),
2097 /* If there is no memory for generating the ERROR
2098 * report as specified, an ABORT will be triggered
2099 * to the peer and the association won't be
2102 retval
= SCTP_IERROR_NOMEM
;
2112 /* Verify variable length parameters
2114 * SCTP_IERROR_ABORT - trigger an ABORT
2115 * SCTP_IERROR_NOMEM - out of memory (abort)
2116 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2117 * SCTP_IERROR_NO_ERROR - continue with the chunk
2119 static enum sctp_ierror
sctp_verify_param(struct net
*net
,
2120 const struct sctp_endpoint
*ep
,
2121 const struct sctp_association
*asoc
,
2122 union sctp_params param
,
2124 struct sctp_chunk
*chunk
,
2125 struct sctp_chunk
**err_chunk
)
2127 struct sctp_hmac_algo_param
*hmacs
;
2128 int retval
= SCTP_IERROR_NO_ERROR
;
2129 __u16 n_elt
, id
= 0;
2132 /* FIXME - This routine is not looking at each parameter per the
2133 * chunk type, i.e., unrecognized parameters should be further
2134 * identified based on the chunk id.
2137 switch (param
.p
->type
) {
2138 case SCTP_PARAM_IPV4_ADDRESS
:
2139 case SCTP_PARAM_IPV6_ADDRESS
:
2140 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2141 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2142 case SCTP_PARAM_STATE_COOKIE
:
2143 case SCTP_PARAM_HEARTBEAT_INFO
:
2144 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2145 case SCTP_PARAM_ECN_CAPABLE
:
2146 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2149 case SCTP_PARAM_SUPPORTED_EXT
:
2150 if (!sctp_verify_ext_param(net
, param
))
2151 return SCTP_IERROR_ABORT
;
2154 case SCTP_PARAM_SET_PRIMARY
:
2155 if (net
->sctp
.addip_enable
)
2159 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2160 /* Tell the peer, we won't support this param. */
2161 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2162 retval
= SCTP_IERROR_ABORT
;
2165 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2166 if (ep
->prsctp_enable
)
2170 case SCTP_PARAM_RANDOM
:
2171 if (!ep
->auth_enable
)
2174 /* SCTP-AUTH: Secion 6.1
2175 * If the random number is not 32 byte long the association
2176 * MUST be aborted. The ABORT chunk SHOULD contain the error
2177 * cause 'Protocol Violation'.
2179 if (SCTP_AUTH_RANDOM_LENGTH
!=
2180 ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
)) {
2181 sctp_process_inv_paramlength(asoc
, param
.p
,
2183 retval
= SCTP_IERROR_ABORT
;
2187 case SCTP_PARAM_CHUNKS
:
2188 if (!ep
->auth_enable
)
2191 /* SCTP-AUTH: Section 3.2
2192 * The CHUNKS parameter MUST be included once in the INIT or
2193 * INIT-ACK chunk if the sender wants to receive authenticated
2194 * chunks. Its maximum length is 260 bytes.
2196 if (260 < ntohs(param
.p
->length
)) {
2197 sctp_process_inv_paramlength(asoc
, param
.p
,
2199 retval
= SCTP_IERROR_ABORT
;
2203 case SCTP_PARAM_HMAC_ALGO
:
2204 if (!ep
->auth_enable
)
2207 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2208 n_elt
= (ntohs(param
.p
->length
) -
2209 sizeof(struct sctp_paramhdr
)) >> 1;
2211 /* SCTP-AUTH: Section 6.1
2212 * The HMAC algorithm based on SHA-1 MUST be supported and
2213 * included in the HMAC-ALGO parameter.
2215 for (i
= 0; i
< n_elt
; i
++) {
2216 id
= ntohs(hmacs
->hmac_ids
[i
]);
2218 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2222 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2223 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2225 retval
= SCTP_IERROR_ABORT
;
2230 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2231 __func__
, ntohs(param
.p
->type
), cid
);
2233 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2239 /* Verify the INIT packet before we process it. */
2240 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2241 const struct sctp_association
*asoc
, enum sctp_cid cid
,
2242 struct sctp_init_chunk
*peer_init
,
2243 struct sctp_chunk
*chunk
, struct sctp_chunk
**errp
)
2245 union sctp_params param
;
2246 bool has_cookie
= false;
2249 /* Check for missing mandatory parameters. Note: Initial TSN is
2250 * also mandatory, but is not checked here since the valid range
2251 * is 0..2**32-1. RFC4960, section 3.3.3.
2253 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2254 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2255 peer_init
->init_hdr
.init_tag
== 0 ||
2256 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2257 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2259 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2260 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2264 /* There is a possibility that a parameter length was bad and
2265 * in that case we would have stoped walking the parameters.
2266 * The current param.p would point at the bad one.
2267 * Current consensus on the mailing list is to generate a PROTOCOL
2268 * VIOLATION error. We build the ERROR chunk here and let the normal
2269 * error handling code build and send the packet.
2271 if (param
.v
!= (void *)chunk
->chunk_end
)
2272 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2274 /* The only missing mandatory param possible today is
2275 * the state cookie for an INIT-ACK chunk.
2277 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2278 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2281 /* Verify all the variable length parameters */
2282 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2283 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2286 case SCTP_IERROR_ABORT
:
2287 case SCTP_IERROR_NOMEM
:
2289 case SCTP_IERROR_ERROR
:
2291 case SCTP_IERROR_NO_ERROR
:
2296 } /* for (loop through all parameters) */
2301 /* Unpack the parameters in an INIT packet into an association.
2302 * Returns 0 on failure, else success.
2303 * FIXME: This is an association method.
2305 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2306 const union sctp_addr
*peer_addr
,
2307 struct sctp_init_chunk
*peer_init
, gfp_t gfp
)
2309 struct net
*net
= sock_net(asoc
->base
.sk
);
2310 struct sctp_transport
*transport
;
2311 struct list_head
*pos
, *temp
;
2312 union sctp_params param
;
2313 union sctp_addr addr
;
2318 /* We must include the address that the INIT packet came from.
2319 * This is the only address that matters for an INIT packet.
2320 * When processing a COOKIE ECHO, we retrieve the from address
2321 * of the INIT from the cookie.
2324 /* This implementation defaults to making the first transport
2325 * added as the primary transport. The source address seems to
2326 * be a a better choice than any of the embedded addresses.
2328 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2331 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2334 /* Process the initialization parameters. */
2335 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2336 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2337 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2338 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2339 af
->from_addr_param(&addr
, param
.addr
,
2340 chunk
->sctp_hdr
->source
, 0);
2341 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2345 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2349 /* source address of chunk may not match any valid address */
2353 /* AUTH: After processing the parameters, make sure that we
2354 * have all the required info to potentially do authentications.
2356 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2357 !asoc
->peer
.peer_hmacs
))
2358 asoc
->peer
.auth_capable
= 0;
2360 /* In a non-backward compatible mode, if the peer claims
2361 * support for ADD-IP but not AUTH, the ADD-IP spec states
2362 * that we MUST ABORT the association. Section 6. The section
2363 * also give us an option to silently ignore the packet, which
2364 * is what we'll do here.
2366 if (!net
->sctp
.addip_noauth
&&
2367 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2368 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2370 SCTP_PARAM_SET_PRIMARY
);
2371 asoc
->peer
.asconf_capable
= 0;
2375 /* Walk list of transports, removing transports in the UNKNOWN state. */
2376 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2377 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2378 if (transport
->state
== SCTP_UNKNOWN
) {
2379 sctp_assoc_rm_peer(asoc
, transport
);
2383 /* The fixed INIT headers are always in network byte
2386 asoc
->peer
.i
.init_tag
=
2387 ntohl(peer_init
->init_hdr
.init_tag
);
2388 asoc
->peer
.i
.a_rwnd
=
2389 ntohl(peer_init
->init_hdr
.a_rwnd
);
2390 asoc
->peer
.i
.num_outbound_streams
=
2391 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2392 asoc
->peer
.i
.num_inbound_streams
=
2393 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2394 asoc
->peer
.i
.initial_tsn
=
2395 ntohl(peer_init
->init_hdr
.initial_tsn
);
2397 asoc
->strreset_inseq
= asoc
->peer
.i
.initial_tsn
;
2399 /* Apply the upper bounds for output streams based on peer's
2400 * number of inbound streams.
2402 if (asoc
->c
.sinit_num_ostreams
>
2403 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2404 asoc
->c
.sinit_num_ostreams
=
2405 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2408 if (asoc
->c
.sinit_max_instreams
>
2409 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2410 asoc
->c
.sinit_max_instreams
=
2411 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2414 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2415 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2417 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2418 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2420 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2421 cookie
= asoc
->peer
.cookie
;
2423 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2424 if (!asoc
->peer
.cookie
)
2428 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2429 * high (for example, implementations MAY use the size of the receiver
2430 * advertised window).
2432 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2434 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2437 /* Set up the TSN tracking pieces. */
2438 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2439 asoc
->peer
.i
.initial_tsn
, gfp
))
2442 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2444 * The stream sequence number in all the streams shall start
2445 * from 0 when the association is established. Also, when the
2446 * stream sequence number reaches the value 65535 the next
2447 * stream sequence number shall be set to 0.
2450 if (sctp_stream_init(&asoc
->stream
, asoc
->c
.sinit_num_ostreams
,
2451 asoc
->c
.sinit_max_instreams
, gfp
))
2454 if (!asoc
->temp
&& sctp_assoc_set_id(asoc
, gfp
))
2457 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2459 * When an endpoint has an ASCONF signaled change to be sent to the
2460 * remote endpoint it should do the following:
2462 * A2) A serial number should be assigned to the Chunk. The serial
2463 * number should be a monotonically increasing number. All serial
2464 * numbers are defined to be initialized at the start of the
2465 * association to the same value as the Initial TSN.
2467 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2471 /* Release the transport structures. */
2472 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2473 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2474 if (transport
->state
!= SCTP_ACTIVE
)
2475 sctp_assoc_rm_peer(asoc
, transport
);
2483 /* Update asoc with the option described in param.
2485 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2487 * asoc is the association to update.
2488 * param is the variable length parameter to use for update.
2489 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2490 * If the current packet is an INIT we want to minimize the amount of
2491 * work we do. In particular, we should not build transport
2492 * structures for the addresses.
2494 static int sctp_process_param(struct sctp_association
*asoc
,
2495 union sctp_params param
,
2496 const union sctp_addr
*peer_addr
,
2499 struct net
*net
= sock_net(asoc
->base
.sk
);
2500 struct sctp_endpoint
*ep
= asoc
->ep
;
2501 union sctp_addr_param
*addr_param
;
2502 struct sctp_transport
*t
;
2503 enum sctp_scope scope
;
2504 union sctp_addr addr
;
2510 /* We maintain all INIT parameters in network byte order all the
2511 * time. This allows us to not worry about whether the parameters
2512 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2514 switch (param
.p
->type
) {
2515 case SCTP_PARAM_IPV6_ADDRESS
:
2516 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2520 case SCTP_PARAM_IPV4_ADDRESS
:
2521 /* v4 addresses are not allowed on v6-only socket */
2522 if (ipv6_only_sock(asoc
->base
.sk
))
2525 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2526 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2527 scope
= sctp_scope(peer_addr
);
2528 if (sctp_in_scope(net
, &addr
, scope
))
2529 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2533 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2534 if (!net
->sctp
.cookie_preserve_enable
)
2537 stale
= ntohl(param
.life
->lifespan_increment
);
2539 /* Suggested Cookie Life span increment's unit is msec,
2542 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2545 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2546 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2549 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2550 /* Turn off the default values first so we'll know which
2551 * ones are really set by the peer.
2553 asoc
->peer
.ipv4_address
= 0;
2554 asoc
->peer
.ipv6_address
= 0;
2556 /* Assume that peer supports the address family
2557 * by which it sends a packet.
2559 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2560 asoc
->peer
.ipv6_address
= 1;
2561 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2562 asoc
->peer
.ipv4_address
= 1;
2564 /* Cycle through address types; avoid divide by 0. */
2565 sat
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2567 sat
/= sizeof(__u16
);
2569 for (i
= 0; i
< sat
; ++i
) {
2570 switch (param
.sat
->types
[i
]) {
2571 case SCTP_PARAM_IPV4_ADDRESS
:
2572 asoc
->peer
.ipv4_address
= 1;
2575 case SCTP_PARAM_IPV6_ADDRESS
:
2576 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2577 asoc
->peer
.ipv6_address
= 1;
2580 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2581 asoc
->peer
.hostname_address
= 1;
2584 default: /* Just ignore anything else. */
2590 case SCTP_PARAM_STATE_COOKIE
:
2591 asoc
->peer
.cookie_len
=
2592 ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2593 asoc
->peer
.cookie
= param
.cookie
->body
;
2596 case SCTP_PARAM_HEARTBEAT_INFO
:
2597 /* Would be odd to receive, but it causes no problems. */
2600 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2601 /* Rejected during verify stage. */
2604 case SCTP_PARAM_ECN_CAPABLE
:
2605 asoc
->peer
.ecn_capable
= 1;
2608 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2609 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2612 case SCTP_PARAM_SET_PRIMARY
:
2613 if (!net
->sctp
.addip_enable
)
2616 addr_param
= param
.v
+ sizeof(struct sctp_addip_param
);
2618 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2622 af
->from_addr_param(&addr
, addr_param
,
2623 htons(asoc
->peer
.port
), 0);
2625 /* if the address is invalid, we can't process it.
2626 * XXX: see spec for what to do.
2628 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2631 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2635 sctp_assoc_set_primary(asoc
, t
);
2638 case SCTP_PARAM_SUPPORTED_EXT
:
2639 sctp_process_ext_param(asoc
, param
);
2642 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2643 if (asoc
->prsctp_enable
) {
2644 asoc
->peer
.prsctp_capable
= 1;
2650 case SCTP_PARAM_RANDOM
:
2651 if (!ep
->auth_enable
)
2654 /* Save peer's random parameter */
2655 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2656 ntohs(param
.p
->length
), gfp
);
2657 if (!asoc
->peer
.peer_random
) {
2663 case SCTP_PARAM_HMAC_ALGO
:
2664 if (!ep
->auth_enable
)
2667 /* Save peer's HMAC list */
2668 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2669 ntohs(param
.p
->length
), gfp
);
2670 if (!asoc
->peer
.peer_hmacs
) {
2675 /* Set the default HMAC the peer requested*/
2676 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2679 case SCTP_PARAM_CHUNKS
:
2680 if (!ep
->auth_enable
)
2683 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2684 ntohs(param
.p
->length
), gfp
);
2685 if (!asoc
->peer
.peer_chunks
)
2690 /* Any unrecognized parameters should have been caught
2691 * and handled by sctp_verify_param() which should be
2692 * called prior to this routine. Simply log the error
2695 pr_debug("%s: ignoring param:%d for association:%p.\n",
2696 __func__
, ntohs(param
.p
->type
), asoc
);
2703 /* Select a new verification tag. */
2704 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2706 /* I believe that this random number generator complies with RFC1750.
2707 * A tag of 0 is reserved for special cases (e.g. INIT).
2712 get_random_bytes(&x
, sizeof(__u32
));
2718 /* Select an initial TSN to send during startup. */
2719 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2723 get_random_bytes(&retval
, sizeof(__u32
));
2728 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2730 * 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
2731 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2732 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2733 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2736 * | Address Parameter |
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | ASCONF Parameter #1 |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2744 * | ASCONF Parameter #N |
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * Address Parameter and other parameter will not be wrapped in this function
2749 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2750 union sctp_addr
*addr
,
2753 struct sctp_addiphdr asconf
;
2754 struct sctp_chunk
*retval
;
2755 int length
= sizeof(asconf
) + vparam_len
;
2756 union sctp_addr_param addrparam
;
2758 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2760 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2765 /* Create the chunk. */
2766 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2771 asconf
.serial
= htonl(asoc
->addip_serial
++);
2773 retval
->subh
.addip_hdr
=
2774 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2775 retval
->param_hdr
.v
=
2776 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2782 * 3.2.1 Add IP Address
2784 * 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
2785 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2786 * | Type = 0xC001 | Length = Variable |
2787 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2788 * | ASCONF-Request Correlation ID |
2789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2790 * | Address Parameter |
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 * 3.2.2 Delete IP Address
2795 * 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
2796 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2797 * | Type = 0xC002 | Length = Variable |
2798 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * | ASCONF-Request Correlation ID |
2800 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2801 * | Address Parameter |
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2806 union sctp_addr
*laddr
,
2807 struct sockaddr
*addrs
,
2808 int addrcnt
, __be16 flags
)
2810 union sctp_addr_param addr_param
;
2811 struct sctp_addip_param param
;
2812 int paramlen
= sizeof(param
);
2813 struct sctp_chunk
*retval
;
2814 int addr_param_len
= 0;
2815 union sctp_addr
*addr
;
2816 int totallen
= 0, i
;
2821 /* Get total length of all the address parameters. */
2823 for (i
= 0; i
< addrcnt
; i
++) {
2825 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2826 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2828 totallen
+= paramlen
;
2829 totallen
+= addr_param_len
;
2831 addr_buf
+= af
->sockaddr_len
;
2832 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2833 /* reuse the parameter length from the same scope one */
2834 totallen
+= paramlen
;
2835 totallen
+= addr_param_len
;
2838 pr_debug("%s: picked same-scope del_pending addr, "
2839 "totallen for all addresses is %d\n",
2840 __func__
, totallen
);
2844 /* Create an asconf chunk with the required length. */
2845 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2849 /* Add the address parameters to the asconf chunk. */
2851 for (i
= 0; i
< addrcnt
; i
++) {
2853 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2854 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2855 param
.param_hdr
.type
= flags
;
2856 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2857 param
.crr_id
= htonl(i
);
2859 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2860 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2862 addr_buf
+= af
->sockaddr_len
;
2864 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2865 addr
= asoc
->asconf_addr_del_pending
;
2866 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2867 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2868 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2869 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2870 param
.crr_id
= htonl(i
);
2872 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2873 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2879 * 3.2.4 Set Primary IP Address
2881 * 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
2882 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2883 * | Type =0xC004 | Length = Variable |
2884 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2885 * | ASCONF-Request Correlation ID |
2886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2887 * | Address Parameter |
2888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2890 * Create an ASCONF chunk with Set Primary IP address parameter.
2892 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2893 union sctp_addr
*addr
)
2895 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2896 union sctp_addr_param addrparam
;
2897 struct sctp_addip_param param
;
2898 struct sctp_chunk
*retval
;
2899 int len
= sizeof(param
);
2902 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2907 /* Create the chunk and make asconf header. */
2908 retval
= sctp_make_asconf(asoc
, addr
, len
);
2912 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2913 param
.param_hdr
.length
= htons(len
);
2916 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2917 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2922 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2924 * 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
2925 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2926 * | Type = 0x80 | Chunk Flags | Chunk Length |
2927 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2929 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2930 * | ASCONF Parameter Response#1 |
2931 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2936 * | ASCONF Parameter Response#N |
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2939 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2941 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2942 __u32 serial
, int vparam_len
)
2944 struct sctp_addiphdr asconf
;
2945 struct sctp_chunk
*retval
;
2946 int length
= sizeof(asconf
) + vparam_len
;
2948 /* Create the chunk. */
2949 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2954 asconf
.serial
= htonl(serial
);
2956 retval
->subh
.addip_hdr
=
2957 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2962 /* Add response parameters to an ASCONF_ACK chunk. */
2963 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2965 struct sctp_addip_param
*asconf_param
)
2967 struct sctp_addip_param ack_param
;
2968 struct sctp_errhdr err_param
;
2969 int asconf_param_len
= 0;
2970 int err_param_len
= 0;
2971 __be16 response_type
;
2973 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2974 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2976 response_type
= SCTP_PARAM_ERR_CAUSE
;
2977 err_param_len
= sizeof(err_param
);
2980 ntohs(asconf_param
->param_hdr
.length
);
2983 /* Add Success Indication or Error Cause Indication parameter. */
2984 ack_param
.param_hdr
.type
= response_type
;
2985 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2988 ack_param
.crr_id
= crr_id
;
2989 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2991 if (SCTP_ERROR_NO_ERROR
== err_code
)
2994 /* Add Error Cause parameter. */
2995 err_param
.cause
= err_code
;
2996 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
2997 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
2999 /* Add the failed TLV copied from ASCONF chunk. */
3001 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3004 /* Process a asconf parameter. */
3005 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3006 struct sctp_chunk
*asconf
,
3007 struct sctp_addip_param
*asconf_param
)
3009 union sctp_addr_param
*addr_param
;
3010 struct sctp_transport
*peer
;
3011 union sctp_addr addr
;
3014 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3016 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3017 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3018 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3019 return SCTP_ERROR_UNKNOWN_PARAM
;
3021 switch (addr_param
->p
.type
) {
3022 case SCTP_PARAM_IPV6_ADDRESS
:
3023 if (!asoc
->peer
.ipv6_address
)
3024 return SCTP_ERROR_DNS_FAILED
;
3026 case SCTP_PARAM_IPV4_ADDRESS
:
3027 if (!asoc
->peer
.ipv4_address
)
3028 return SCTP_ERROR_DNS_FAILED
;
3031 return SCTP_ERROR_DNS_FAILED
;
3034 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3036 return SCTP_ERROR_DNS_FAILED
;
3038 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3040 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3041 * or multicast address.
3042 * (note: wildcard is permitted and requires special handling so
3043 * make sure we check for that)
3045 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3046 return SCTP_ERROR_DNS_FAILED
;
3048 switch (asconf_param
->param_hdr
.type
) {
3049 case SCTP_PARAM_ADD_IP
:
3051 * If the address 0.0.0.0 or ::0 is provided, the source
3052 * address of the packet MUST be added.
3054 if (af
->is_any(&addr
))
3055 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3057 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3058 * request and does not have the local resources to add this
3059 * new address to the association, it MUST return an Error
3060 * Cause TLV set to the new error code 'Operation Refused
3061 * Due to Resource Shortage'.
3064 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3066 return SCTP_ERROR_RSRC_LOW
;
3068 /* Start the heartbeat timer. */
3069 sctp_transport_reset_hb_timer(peer
);
3070 asoc
->new_transport
= peer
;
3072 case SCTP_PARAM_DEL_IP
:
3073 /* ADDIP 4.3 D7) If a request is received to delete the
3074 * last remaining IP address of a peer endpoint, the receiver
3075 * MUST send an Error Cause TLV with the error cause set to the
3076 * new error code 'Request to Delete Last Remaining IP Address'.
3078 if (asoc
->peer
.transport_count
== 1)
3079 return SCTP_ERROR_DEL_LAST_IP
;
3081 /* ADDIP 4.3 D8) If a request is received to delete an IP
3082 * address which is also the source address of the IP packet
3083 * which contained the ASCONF chunk, the receiver MUST reject
3084 * this request. To reject the request the receiver MUST send
3085 * an Error Cause TLV set to the new error code 'Request to
3086 * Delete Source IP Address'
3088 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3089 return SCTP_ERROR_DEL_SRC_IP
;
3092 * If the address 0.0.0.0 or ::0 is provided, all
3093 * addresses of the peer except the source address of the
3094 * packet MUST be deleted.
3096 if (af
->is_any(&addr
)) {
3097 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3098 sctp_assoc_del_nonprimary_peers(asoc
,
3100 return SCTP_ERROR_NO_ERROR
;
3103 /* If the address is not part of the association, the
3104 * ASCONF-ACK with Error Cause Indication Parameter
3105 * which including cause of Unresolvable Address should
3108 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3110 return SCTP_ERROR_DNS_FAILED
;
3112 sctp_assoc_rm_peer(asoc
, peer
);
3114 case SCTP_PARAM_SET_PRIMARY
:
3115 /* ADDIP Section 4.2.4
3116 * If the address 0.0.0.0 or ::0 is provided, the receiver
3117 * MAY mark the source address of the packet as its
3120 if (af
->is_any(&addr
))
3121 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3123 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3125 return SCTP_ERROR_DNS_FAILED
;
3127 sctp_assoc_set_primary(asoc
, peer
);
3131 return SCTP_ERROR_NO_ERROR
;
3134 /* Verify the ASCONF packet before we process it. */
3135 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3136 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3137 struct sctp_paramhdr
**errp
)
3139 struct sctp_addip_chunk
*addip
;
3140 bool addr_param_seen
= false;
3141 union sctp_params param
;
3143 addip
= (struct sctp_addip_chunk
*)chunk
->chunk_hdr
;
3144 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3145 size_t length
= ntohs(param
.p
->length
);
3148 switch (param
.p
->type
) {
3149 case SCTP_PARAM_ERR_CAUSE
:
3151 case SCTP_PARAM_IPV4_ADDRESS
:
3152 if (length
!= sizeof(struct sctp_ipv4addr_param
))
3154 /* ensure there is only one addr param and it's in the
3155 * beginning of addip_hdr params, or we reject it.
3157 if (param
.v
!= addip
->addip_hdr
.params
)
3159 addr_param_seen
= true;
3161 case SCTP_PARAM_IPV6_ADDRESS
:
3162 if (length
!= sizeof(struct sctp_ipv6addr_param
))
3164 if (param
.v
!= addip
->addip_hdr
.params
)
3166 addr_param_seen
= true;
3168 case SCTP_PARAM_ADD_IP
:
3169 case SCTP_PARAM_DEL_IP
:
3170 case SCTP_PARAM_SET_PRIMARY
:
3171 /* In ASCONF chunks, these need to be first. */
3172 if (addr_param_needed
&& !addr_param_seen
)
3174 length
= ntohs(param
.addip
->param_hdr
.length
);
3175 if (length
< sizeof(struct sctp_addip_param
) +
3179 case SCTP_PARAM_SUCCESS_REPORT
:
3180 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3181 if (length
!= sizeof(struct sctp_addip_param
))
3185 /* This is unkown to us, reject! */
3190 /* Remaining sanity checks. */
3191 if (addr_param_needed
&& !addr_param_seen
)
3193 if (!addr_param_needed
&& addr_param_seen
)
3195 if (param
.v
!= chunk
->chunk_end
)
3201 /* Process an incoming ASCONF chunk with the next expected serial no. and
3202 * return an ASCONF_ACK chunk to be sent in response.
3204 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3205 struct sctp_chunk
*asconf
)
3207 union sctp_addr_param
*addr_param
;
3208 struct sctp_addip_chunk
*addip
;
3209 struct sctp_chunk
*asconf_ack
;
3210 bool all_param_pass
= true;
3211 struct sctp_addiphdr
*hdr
;
3212 int length
= 0, chunk_len
;
3213 union sctp_params param
;
3217 addip
= (struct sctp_addip_chunk
*)asconf
->chunk_hdr
;
3218 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) -
3219 sizeof(struct sctp_chunkhdr
);
3220 hdr
= (struct sctp_addiphdr
*)asconf
->skb
->data
;
3221 serial
= ntohl(hdr
->serial
);
3223 /* Skip the addiphdr and store a pointer to address parameter. */
3224 length
= sizeof(*hdr
);
3225 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3226 chunk_len
-= length
;
3228 /* Skip the address parameter and store a pointer to the first
3231 length
= ntohs(addr_param
->p
.length
);
3232 chunk_len
-= length
;
3234 /* create an ASCONF_ACK chunk.
3235 * Based on the definitions of parameters, we know that the size of
3236 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3239 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3243 /* Process the TLVs contained within the ASCONF chunk. */
3244 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3245 /* Skip preceeding address parameters. */
3246 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3247 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3250 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3253 * If an error response is received for a TLV parameter,
3254 * all TLVs with no response before the failed TLV are
3255 * considered successful if not reported. All TLVs after
3256 * the failed response are considered unsuccessful unless
3257 * a specific success indication is present for the parameter.
3259 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3260 all_param_pass
= false;
3261 if (!all_param_pass
)
3262 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3263 err_code
, param
.addip
);
3265 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3266 * an IP address sends an 'Out of Resource' in its response, it
3267 * MUST also fail any subsequent add or delete requests bundled
3270 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3274 asoc
->peer
.addip_serial
++;
3276 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3277 * after freeing the reference to old asconf ack if any.
3280 sctp_chunk_hold(asconf_ack
);
3281 list_add_tail(&asconf_ack
->transmitted_list
,
3282 &asoc
->asconf_ack_list
);
3288 /* Process a asconf parameter that is successfully acked. */
3289 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3290 struct sctp_addip_param
*asconf_param
)
3292 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3293 union sctp_addr_param
*addr_param
;
3294 struct sctp_sockaddr_entry
*saddr
;
3295 struct sctp_transport
*transport
;
3296 union sctp_addr addr
;
3299 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3301 /* We have checked the packet before, so we do not check again. */
3302 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3303 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3305 switch (asconf_param
->param_hdr
.type
) {
3306 case SCTP_PARAM_ADD_IP
:
3307 /* This is always done in BH context with a socket lock
3308 * held, so the list can not change.
3311 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3312 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3313 saddr
->state
= SCTP_ADDR_SRC
;
3316 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3318 sctp_transport_dst_release(transport
);
3321 case SCTP_PARAM_DEL_IP
:
3323 sctp_del_bind_addr(bp
, &addr
);
3324 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3325 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3326 kfree(asoc
->asconf_addr_del_pending
);
3327 asoc
->asconf_addr_del_pending
= NULL
;
3330 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3332 sctp_transport_dst_release(transport
);
3340 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3341 * for the given asconf parameter. If there is no response for this parameter,
3342 * return the error code based on the third argument 'no_err'.
3344 * A7) If an error response is received for a TLV parameter, all TLVs with no
3345 * response before the failed TLV are considered successful if not reported.
3346 * All TLVs after the failed response are considered unsuccessful unless a
3347 * specific success indication is present for the parameter.
3349 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3350 struct sctp_addip_param
*asconf_param
,
3353 struct sctp_addip_param
*asconf_ack_param
;
3354 struct sctp_errhdr
*err_param
;
3360 err_code
= SCTP_ERROR_NO_ERROR
;
3362 err_code
= SCTP_ERROR_REQ_REFUSED
;
3364 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3365 sizeof(struct sctp_chunkhdr
);
3367 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3368 * the first asconf_ack parameter.
3370 length
= sizeof(struct sctp_addiphdr
);
3371 asconf_ack_param
= (struct sctp_addip_param
*)(asconf_ack
->skb
->data
+
3373 asconf_ack_len
-= length
;
3375 while (asconf_ack_len
> 0) {
3376 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3377 switch (asconf_ack_param
->param_hdr
.type
) {
3378 case SCTP_PARAM_SUCCESS_REPORT
:
3379 return SCTP_ERROR_NO_ERROR
;
3380 case SCTP_PARAM_ERR_CAUSE
:
3381 length
= sizeof(*asconf_ack_param
);
3382 err_param
= (void *)asconf_ack_param
+ length
;
3383 asconf_ack_len
-= length
;
3384 if (asconf_ack_len
> 0)
3385 return err_param
->cause
;
3387 return SCTP_ERROR_INV_PARAM
;
3390 return SCTP_ERROR_INV_PARAM
;
3394 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3395 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3396 asconf_ack_len
-= length
;
3402 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3403 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3404 struct sctp_chunk
*asconf_ack
)
3406 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3407 struct sctp_addip_param
*asconf_param
;
3408 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3409 union sctp_addr_param
*addr_param
;
3410 int asconf_len
= asconf
->skb
->len
;
3411 int all_param_pass
= 0;
3416 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3417 * a pointer to address parameter.
3419 length
= sizeof(struct sctp_addip_chunk
);
3420 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3421 asconf_len
-= length
;
3423 /* Skip the address parameter in the last asconf sent and store a
3424 * pointer to the first asconf parameter.
3426 length
= ntohs(addr_param
->p
.length
);
3427 asconf_param
= (void *)addr_param
+ length
;
3428 asconf_len
-= length
;
3431 * A8) If there is no response(s) to specific TLV parameter(s), and no
3432 * failures are indicated, then all request(s) are considered
3435 if (asconf_ack
->skb
->len
== sizeof(struct sctp_addiphdr
))
3438 /* Process the TLVs contained in the last sent ASCONF chunk. */
3439 while (asconf_len
> 0) {
3441 err_code
= SCTP_ERROR_NO_ERROR
;
3443 err_code
= sctp_get_asconf_response(asconf_ack
,
3446 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3451 case SCTP_ERROR_NO_ERROR
:
3452 sctp_asconf_param_success(asoc
, asconf_param
);
3455 case SCTP_ERROR_RSRC_LOW
:
3459 case SCTP_ERROR_UNKNOWN_PARAM
:
3460 /* Disable sending this type of asconf parameter in
3463 asoc
->peer
.addip_disabled_mask
|=
3464 asconf_param
->param_hdr
.type
;
3467 case SCTP_ERROR_REQ_REFUSED
:
3468 case SCTP_ERROR_DEL_LAST_IP
:
3469 case SCTP_ERROR_DEL_SRC_IP
:
3474 /* Skip the processed asconf parameter and move to the next
3477 length
= ntohs(asconf_param
->param_hdr
.length
);
3478 asconf_param
= (void *)asconf_param
+ length
;
3479 asconf_len
-= length
;
3482 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3483 asoc
->src_out_of_asoc_ok
= 0;
3484 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3487 /* Free the cached last sent asconf chunk. */
3488 list_del_init(&asconf
->transmitted_list
);
3489 sctp_chunk_free(asconf
);
3490 asoc
->addip_last_asconf
= NULL
;
3495 /* Make a FWD TSN chunk. */
3496 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3497 __u32 new_cum_tsn
, size_t nstreams
,
3498 struct sctp_fwdtsn_skip
*skiplist
)
3500 struct sctp_chunk
*retval
= NULL
;
3501 struct sctp_fwdtsn_hdr ftsn_hdr
;
3502 struct sctp_fwdtsn_skip skip
;
3506 hint
= (nstreams
+ 1) * sizeof(__u32
);
3508 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3513 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3514 retval
->subh
.fwdtsn_hdr
=
3515 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3517 for (i
= 0; i
< nstreams
; i
++) {
3518 skip
.stream
= skiplist
[i
].stream
;
3519 skip
.ssn
= skiplist
[i
].ssn
;
3520 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);
3526 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3528 * 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
3529 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3530 * | Type = 130 | Chunk Flags | Chunk Length |
3531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3533 * / Re-configuration Parameter /
3535 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3537 * / Re-configuration Parameter (optional) /
3539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3541 static struct sctp_chunk
*sctp_make_reconf(const struct sctp_association
*asoc
,
3544 struct sctp_reconf_chunk
*reconf
;
3545 struct sctp_chunk
*retval
;
3547 retval
= sctp_make_control(asoc
, SCTP_CID_RECONF
, 0, length
,
3552 reconf
= (struct sctp_reconf_chunk
*)retval
->chunk_hdr
;
3553 retval
->param_hdr
.v
= reconf
->params
;
3558 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3560 * 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
3561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3562 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3564 * | Re-configuration Request Sequence Number |
3565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3566 * | Re-configuration Response Sequence Number |
3567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3568 * | Sender's Last Assigned TSN |
3569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3570 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3574 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3577 * RE-CONFIG 4.2 (STREAM IN RESET)
3579 * 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
3580 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3581 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3582 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 * | Re-configuration Request Sequence Number |
3584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3585 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3590 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3592 struct sctp_chunk
*sctp_make_strreset_req(
3593 const struct sctp_association
*asoc
,
3594 __u16 stream_num
, __be16
*stream_list
,
3597 struct sctp_strreset_outreq outreq
;
3598 __u16 stream_len
= stream_num
* 2;
3599 struct sctp_strreset_inreq inreq
;
3600 struct sctp_chunk
*retval
;
3601 __u16 outlen
, inlen
;
3603 outlen
= (sizeof(outreq
) + stream_len
) * out
;
3604 inlen
= (sizeof(inreq
) + stream_len
) * in
;
3606 retval
= sctp_make_reconf(asoc
, outlen
+ inlen
);
3611 outreq
.param_hdr
.type
= SCTP_PARAM_RESET_OUT_REQUEST
;
3612 outreq
.param_hdr
.length
= htons(outlen
);
3613 outreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3614 outreq
.response_seq
= htonl(asoc
->strreset_inseq
- 1);
3615 outreq
.send_reset_at_tsn
= htonl(asoc
->next_tsn
- 1);
3617 sctp_addto_chunk(retval
, sizeof(outreq
), &outreq
);
3620 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3624 inreq
.param_hdr
.type
= SCTP_PARAM_RESET_IN_REQUEST
;
3625 inreq
.param_hdr
.length
= htons(inlen
);
3626 inreq
.request_seq
= htonl(asoc
->strreset_outseq
+ out
);
3628 sctp_addto_chunk(retval
, sizeof(inreq
), &inreq
);
3631 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3637 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3639 * 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
3640 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3641 * | Parameter Type = 15 | Parameter Length = 8 |
3642 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3643 * | Re-configuration Request Sequence Number |
3644 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3646 struct sctp_chunk
*sctp_make_strreset_tsnreq(
3647 const struct sctp_association
*asoc
)
3649 struct sctp_strreset_tsnreq tsnreq
;
3650 __u16 length
= sizeof(tsnreq
);
3651 struct sctp_chunk
*retval
;
3653 retval
= sctp_make_reconf(asoc
, length
);
3657 tsnreq
.param_hdr
.type
= SCTP_PARAM_RESET_TSN_REQUEST
;
3658 tsnreq
.param_hdr
.length
= htons(length
);
3659 tsnreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3661 sctp_addto_chunk(retval
, sizeof(tsnreq
), &tsnreq
);
3666 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3668 * 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
3669 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3670 * | Parameter Type = 17 | Parameter Length = 12 |
3671 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3672 * | Re-configuration Request Sequence Number |
3673 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3674 * | Number of new streams | Reserved |
3675 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3677 struct sctp_chunk
*sctp_make_strreset_addstrm(
3678 const struct sctp_association
*asoc
,
3679 __u16 out
, __u16 in
)
3681 struct sctp_strreset_addstrm addstrm
;
3682 __u16 size
= sizeof(addstrm
);
3683 struct sctp_chunk
*retval
;
3685 retval
= sctp_make_reconf(asoc
, (!!out
+ !!in
) * size
);
3690 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_OUT_STREAMS
;
3691 addstrm
.param_hdr
.length
= htons(size
);
3692 addstrm
.number_of_streams
= htons(out
);
3693 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
);
3694 addstrm
.reserved
= 0;
3696 sctp_addto_chunk(retval
, size
, &addstrm
);
3700 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_IN_STREAMS
;
3701 addstrm
.param_hdr
.length
= htons(size
);
3702 addstrm
.number_of_streams
= htons(in
);
3703 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
+ !!out
);
3704 addstrm
.reserved
= 0;
3706 sctp_addto_chunk(retval
, size
, &addstrm
);
3712 /* RE-CONFIG 4.4 (RESP)
3714 * 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
3715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3716 * | Parameter Type = 16 | Parameter Length |
3717 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3718 * | Re-configuration Response Sequence Number |
3719 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3721 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3723 struct sctp_chunk
*sctp_make_strreset_resp(const struct sctp_association
*asoc
,
3724 __u32 result
, __u32 sn
)
3726 struct sctp_strreset_resp resp
;
3727 __u16 length
= sizeof(resp
);
3728 struct sctp_chunk
*retval
;
3730 retval
= sctp_make_reconf(asoc
, length
);
3734 resp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3735 resp
.param_hdr
.length
= htons(length
);
3736 resp
.response_seq
= htonl(sn
);
3737 resp
.result
= htonl(result
);
3739 sctp_addto_chunk(retval
, sizeof(resp
), &resp
);
3744 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3746 * 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
3747 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3748 * | Parameter Type = 16 | Parameter Length |
3749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3750 * | Re-configuration Response Sequence Number |
3751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3754 * | Sender's Next TSN (optional) |
3755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3756 * | Receiver's Next TSN (optional) |
3757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3759 struct sctp_chunk
*sctp_make_strreset_tsnresp(struct sctp_association
*asoc
,
3760 __u32 result
, __u32 sn
,
3764 struct sctp_strreset_resptsn tsnresp
;
3765 __u16 length
= sizeof(tsnresp
);
3766 struct sctp_chunk
*retval
;
3768 retval
= sctp_make_reconf(asoc
, length
);
3772 tsnresp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3773 tsnresp
.param_hdr
.length
= htons(length
);
3775 tsnresp
.response_seq
= htonl(sn
);
3776 tsnresp
.result
= htonl(result
);
3777 tsnresp
.senders_next_tsn
= htonl(sender_tsn
);
3778 tsnresp
.receivers_next_tsn
= htonl(receiver_tsn
);
3780 sctp_addto_chunk(retval
, sizeof(tsnresp
), &tsnresp
);
3785 bool sctp_verify_reconf(const struct sctp_association
*asoc
,
3786 struct sctp_chunk
*chunk
,
3787 struct sctp_paramhdr
**errp
)
3789 struct sctp_reconf_chunk
*hdr
;
3790 union sctp_params param
;
3794 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
3795 sctp_walk_params(param
, hdr
, params
) {
3796 __u16 length
= ntohs(param
.p
->length
);
3801 switch (param
.p
->type
) {
3802 case SCTP_PARAM_RESET_OUT_REQUEST
:
3803 if (length
< sizeof(struct sctp_strreset_outreq
) ||
3804 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3805 last
!= SCTP_PARAM_RESET_IN_REQUEST
))
3808 case SCTP_PARAM_RESET_IN_REQUEST
:
3809 if (length
< sizeof(struct sctp_strreset_inreq
) ||
3810 (last
&& last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3813 case SCTP_PARAM_RESET_RESPONSE
:
3814 if ((length
!= sizeof(struct sctp_strreset_resp
) &&
3815 length
!= sizeof(struct sctp_strreset_resptsn
)) ||
3816 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3817 last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3820 case SCTP_PARAM_RESET_TSN_REQUEST
:
3822 sizeof(struct sctp_strreset_tsnreq
) || last
)
3825 case SCTP_PARAM_RESET_ADD_IN_STREAMS
:
3826 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3827 (last
&& last
!= SCTP_PARAM_RESET_ADD_OUT_STREAMS
))
3830 case SCTP_PARAM_RESET_ADD_OUT_STREAMS
:
3831 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3832 (last
&& last
!= SCTP_PARAM_RESET_ADD_IN_STREAMS
))
3839 last
= param
.p
->type
;