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 sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
73 const struct sctp_association
*asoc
,
74 const struct sctp_chunk
*init_chunk
,
76 const __u8
*raw_addrs
, int addrs_len
);
77 static int sctp_process_param(struct sctp_association
*asoc
,
78 union sctp_params param
,
79 const union sctp_addr
*peer_addr
,
81 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
83 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*, int len
,
86 /* Control chunk destructor */
87 static void sctp_control_release_owner(struct sk_buff
*skb
)
89 /*TODO: do memory release */
92 static void sctp_control_set_owner_w(struct sctp_chunk
*chunk
)
94 struct sctp_association
*asoc
= chunk
->asoc
;
95 struct sk_buff
*skb
= chunk
->skb
;
97 /* TODO: properly account for control chunks.
98 * To do it right we'll need:
99 * 1) endpoint if association isn't known.
100 * 2) proper memory accounting.
102 * For now don't do anything for now.
104 skb
->sk
= asoc
? asoc
->base
.sk
: NULL
;
105 skb
->destructor
= sctp_control_release_owner
;
108 /* What was the inbound interface for this chunk? */
109 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
111 struct sk_buff
*skb
= chunk
->skb
;
113 return SCTP_INPUT_CB(skb
)->af
->skb_iif(skb
);
116 /* RFC 2960 3.3.2 Initiation (INIT) (1)
118 * Note 2: The ECN capable field is reserved for future use of
119 * Explicit Congestion Notification.
121 static const struct sctp_paramhdr ecap_param
= {
122 SCTP_PARAM_ECN_CAPABLE
,
123 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
125 static const struct sctp_paramhdr prsctp_param
= {
126 SCTP_PARAM_FWD_TSN_SUPPORT
,
127 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
130 /* A helper to initialize an op error inside a
131 * provided chunk, as most cause codes will be embedded inside an
134 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
140 /* Cause code constants are now defined in network order. */
141 err
.cause
= cause_code
;
142 len
= sizeof(sctp_errhdr_t
) + paylen
;
143 err
.length
= htons(len
);
144 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
147 /* A helper to initialize an op error inside a
148 * provided chunk, as most cause codes will be embedded inside an
149 * abort chunk. Differs from sctp_init_cause in that it won't oops
150 * if there isn't enough space in the op error chunk
152 static int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
158 /* Cause code constants are now defined in network order. */
159 err
.cause
= cause_code
;
160 len
= sizeof(sctp_errhdr_t
) + paylen
;
161 err
.length
= htons(len
);
163 if (skb_tailroom(chunk
->skb
) < len
)
165 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
,
166 sizeof(sctp_errhdr_t
),
170 /* 3.3.2 Initiation (INIT) (1)
172 * This chunk is used to initiate a SCTP association between two
173 * endpoints. The format of the INIT chunk is shown below:
176 * 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
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
178 * | Type = 1 | Chunk Flags | Chunk Length |
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * | Advertised Receiver Window Credit (a_rwnd) |
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 * | Number of Outbound Streams | Number of Inbound Streams |
185 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * / Optional/Variable-Length Parameters /
191 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * The INIT chunk contains the following parameters. Unless otherwise
195 * noted, each parameter MUST only be included once in the INIT chunk.
197 * Fixed Parameters Status
198 * ----------------------------------------------
199 * Initiate Tag Mandatory
200 * Advertised Receiver Window Credit Mandatory
201 * Number of Outbound Streams Mandatory
202 * Number of Inbound Streams Mandatory
203 * Initial TSN Mandatory
205 * Variable Parameters Status Type Value
206 * -------------------------------------------------------------
207 * IPv4 Address (Note 1) Optional 5
208 * IPv6 Address (Note 1) Optional 6
209 * Cookie Preservative Optional 9
210 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
211 * Host Name Address (Note 3) Optional 11
212 * Supported Address Types (Note 4) Optional 12
214 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
215 const struct sctp_bind_addr
*bp
,
216 gfp_t gfp
, int vparam_len
)
218 struct net
*net
= sock_net(asoc
->base
.sk
);
219 struct sctp_endpoint
*ep
= asoc
->ep
;
221 union sctp_params addrs
;
223 struct sctp_chunk
*retval
= NULL
;
224 int num_types
, addrs_len
= 0;
225 struct sctp_sock
*sp
;
226 sctp_supported_addrs_param_t sat
;
228 sctp_adaptation_ind_param_t aiparam
;
229 sctp_supported_ext_param_t ext_param
;
232 sctp_paramhdr_t
*auth_chunks
= NULL
,
235 /* RFC 2960 3.3.2 Initiation (INIT) (1)
237 * Note 1: The INIT chunks can contain multiple addresses that
238 * 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
= (sctp_paramhdr_t
*)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
= (sctp_paramhdr_t
*)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(sctp_supported_ext_param_t
) +
311 /* RFC 2960 3.3.2 Initiation (INIT) (1)
313 * Note 3: An INIT chunk MUST NOT contain more than one Host
314 * Name address parameter. Moreover, the sender of the INIT
315 * MUST NOT combine any other address types with the Host Name
316 * address in the INIT. The receiver of INIT MUST ignore any
317 * other address types if the Host Name address parameter is
318 * present in the received INIT chunk.
320 * PLEASE DO NOT FIXME [This version does not support Host Name.]
323 retval
= sctp_make_control(asoc
, SCTP_CID_INIT
, 0, chunksize
, gfp
);
327 retval
->subh
.init_hdr
=
328 sctp_addto_chunk(retval
, sizeof(init
), &init
);
329 retval
->param_hdr
.v
=
330 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
332 /* RFC 2960 3.3.2 Initiation (INIT) (1)
334 * Note 4: This parameter, when present, specifies all the
335 * address types the sending endpoint can support. The absence
336 * of this parameter indicates that the sending endpoint can
337 * support any address type.
339 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
340 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
341 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
342 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
344 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
346 /* Add the supported extensions parameter. Be nice and add this
347 * fist before addiding the parameters for the extensions themselves
350 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
351 ext_param
.param_hdr
.length
=
352 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
353 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
355 sctp_addto_param(retval
, num_ext
, extensions
);
358 if (asoc
->prsctp_enable
)
359 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
361 if (sp
->adaptation_ind
) {
362 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
363 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
364 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
365 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
368 /* Add SCTP-AUTH chunks to the parameter list */
369 if (ep
->auth_enable
) {
370 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
371 asoc
->c
.auth_random
);
373 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
376 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
384 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
385 const struct sctp_chunk
*chunk
,
386 gfp_t gfp
, int unkparam_len
)
388 sctp_inithdr_t initack
;
389 struct sctp_chunk
*retval
;
390 union sctp_params addrs
;
391 struct sctp_sock
*sp
;
393 sctp_cookie_param_t
*cookie
;
396 sctp_adaptation_ind_param_t aiparam
;
397 sctp_supported_ext_param_t ext_param
;
400 sctp_paramhdr_t
*auth_chunks
= NULL
,
406 /* Note: there may be no addresses to embed. */
407 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
409 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
410 initack
.a_rwnd
= htonl(asoc
->rwnd
);
411 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
412 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
413 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
415 /* FIXME: We really ought to build the cookie right
416 * into the packet instead of allocating more fresh memory.
418 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
423 /* Calculate the total size of allocation, include the reserved
424 * space for reporting unknown parameters if it is specified.
426 sp
= sctp_sk(asoc
->base
.sk
);
427 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
429 /* Tell peer that we'll do ECN only if peer advertised such cap. */
430 if (asoc
->peer
.ecn_capable
)
431 chunksize
+= sizeof(ecap_param
);
433 if (asoc
->peer
.prsctp_capable
)
434 chunksize
+= sizeof(prsctp_param
);
436 if (asoc
->peer
.asconf_capable
) {
437 extensions
[num_ext
] = SCTP_CID_ASCONF
;
438 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
442 if (asoc
->peer
.reconf_capable
) {
443 extensions
[num_ext
] = SCTP_CID_RECONF
;
447 if (sp
->adaptation_ind
)
448 chunksize
+= sizeof(aiparam
);
450 if (asoc
->peer
.auth_capable
) {
451 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
452 chunksize
+= ntohs(auth_random
->length
);
454 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
455 if (auth_hmacs
->length
)
456 chunksize
+= SCTP_PAD4(ntohs(auth_hmacs
->length
));
460 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
461 if (auth_chunks
->length
)
462 chunksize
+= SCTP_PAD4(ntohs(auth_chunks
->length
));
466 extensions
[num_ext
] = SCTP_CID_AUTH
;
471 chunksize
+= SCTP_PAD4(sizeof(sctp_supported_ext_param_t
) +
474 /* Now allocate and fill out the chunk. */
475 retval
= sctp_make_control(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
, gfp
);
479 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
481 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
482 * HEARTBEAT ACK, * etc.) to the same destination transport
483 * address from which it received the DATA or control chunk
484 * to which it is replying.
486 * [INIT ACK back to where the INIT came from.]
488 retval
->transport
= chunk
->transport
;
490 retval
->subh
.init_hdr
=
491 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
492 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
493 sctp_addto_chunk(retval
, cookie_len
, cookie
);
494 if (asoc
->peer
.ecn_capable
)
495 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
497 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
498 ext_param
.param_hdr
.length
=
499 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
500 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
502 sctp_addto_param(retval
, num_ext
, extensions
);
504 if (asoc
->peer
.prsctp_capable
)
505 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
507 if (sp
->adaptation_ind
) {
508 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
509 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
510 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
511 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
514 if (asoc
->peer
.auth_capable
) {
515 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
518 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
521 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
525 /* We need to remove the const qualifier at this point. */
526 retval
->asoc
= (struct sctp_association
*) asoc
;
535 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
537 * This chunk is used only during the initialization of an association.
538 * It is sent by the initiator of an association to its peer to complete
539 * the initialization process. This chunk MUST precede any DATA chunk
540 * sent within the association, but MAY be bundled with one or more DATA
541 * chunks in the same packet.
544 * 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
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Type = 10 |Chunk Flags | Length |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 * Set to zero on transmit and ignored on receipt.
556 * Length: 16 bits (unsigned integer)
558 * Set to the size of the chunk in bytes, including the 4 bytes of
559 * the chunk header and the size of the Cookie.
561 * Cookie: variable size
563 * This field must contain the exact cookie received in the
564 * State Cookie parameter from the previous INIT ACK.
566 * An implementation SHOULD make the cookie as small as possible
567 * to insure interoperability.
569 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
570 const struct sctp_chunk
*chunk
)
572 struct sctp_chunk
*retval
;
576 cookie
= asoc
->peer
.cookie
;
577 cookie_len
= asoc
->peer
.cookie_len
;
579 /* Build a cookie echo chunk. */
580 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ECHO
, 0,
581 cookie_len
, GFP_ATOMIC
);
584 retval
->subh
.cookie_hdr
=
585 sctp_addto_chunk(retval
, cookie_len
, cookie
);
587 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
589 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
590 * HEARTBEAT ACK, * etc.) to the same destination transport
591 * address from which it * received the DATA or control chunk
592 * to which it is replying.
594 * [COOKIE ECHO back to where the INIT ACK came from.]
597 retval
->transport
= chunk
->transport
;
603 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
605 * This chunk is used only during the initialization of an
606 * association. It is used to acknowledge the receipt of a COOKIE
607 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
608 * within the association, but MAY be bundled with one or more DATA
609 * chunks or SACK chunk in the same SCTP packet.
612 * 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
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
614 * | Type = 11 |Chunk Flags | Length = 4 |
615 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
617 * Chunk Flags: 8 bits
619 * Set to zero on transmit and ignored on receipt.
621 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
622 const struct sctp_chunk
*chunk
)
624 struct sctp_chunk
*retval
;
626 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0, GFP_ATOMIC
);
628 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
630 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
631 * HEARTBEAT ACK, * etc.) to the same destination transport
632 * address from which it * received the DATA or control chunk
633 * to which it is replying.
635 * [COOKIE ACK back to where the COOKIE ECHO came from.]
638 retval
->transport
= chunk
->transport
;
644 * Appendix A: Explicit Congestion Notification:
647 * RFC 2481 details a specific bit for a sender to send in the header of
648 * its next outbound TCP segment to indicate to its peer that it has
649 * reduced its congestion window. This is termed the CWR bit. For
650 * SCTP the same indication is made by including the CWR chunk.
651 * This chunk contains one data element, i.e. the TSN number that
652 * was sent in the ECNE chunk. This element represents the lowest
653 * TSN number in the datagram that was originally marked with the
657 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661 * | Lowest TSN Number |
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664 * Note: The CWR is considered a Control chunk.
666 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
667 const __u32 lowest_tsn
,
668 const struct sctp_chunk
*chunk
)
670 struct sctp_chunk
*retval
;
673 cwr
.lowest_tsn
= htonl(lowest_tsn
);
674 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_CWR
, 0,
675 sizeof(sctp_cwrhdr_t
), GFP_ATOMIC
);
680 retval
->subh
.ecn_cwr_hdr
=
681 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
683 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
685 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
686 * HEARTBEAT ACK, * etc.) to the same destination transport
687 * address from which it * received the DATA or control chunk
688 * to which it is replying.
690 * [Report a reduced congestion window back to where the ECNE
694 retval
->transport
= chunk
->transport
;
700 /* Make an ECNE chunk. This is a congestion experienced report. */
701 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
702 const __u32 lowest_tsn
)
704 struct sctp_chunk
*retval
;
707 ecne
.lowest_tsn
= htonl(lowest_tsn
);
708 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_ECNE
, 0,
709 sizeof(sctp_ecnehdr_t
), GFP_ATOMIC
);
712 retval
->subh
.ecne_hdr
=
713 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
719 /* Make a DATA chunk for the given association from the provided
720 * parameters. However, do not populate the data payload.
722 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
723 const struct sctp_sndrcvinfo
*sinfo
,
724 int data_len
, __u8 flags
, __u16 ssn
,
727 struct sctp_chunk
*retval
;
728 struct sctp_datahdr dp
;
731 /* We assign the TSN as LATE as possible, not here when
732 * creating the chunk.
735 dp
.stream
= htons(sinfo
->sinfo_stream
);
736 dp
.ppid
= sinfo
->sinfo_ppid
;
738 /* Set the flags for an unordered send. */
739 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
740 flags
|= SCTP_DATA_UNORDERED
;
745 chunk_len
= sizeof(dp
) + data_len
;
746 retval
= sctp_make_data(asoc
, flags
, chunk_len
, gfp
);
750 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
751 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
757 /* Create a selective ackowledgement (SACK) for the given
758 * association. This reports on which TSN's we've seen to date,
759 * including duplicates and gaps.
761 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
763 struct sctp_chunk
*retval
;
764 struct sctp_sackhdr sack
;
767 __u16 num_gabs
, num_dup_tsns
;
768 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
769 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
770 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
771 struct sctp_transport
*trans
;
773 memset(gabs
, 0, sizeof(gabs
));
774 ctsn
= sctp_tsnmap_get_ctsn(map
);
776 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__
, ctsn
);
778 /* How much room is needed in the chunk? */
779 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
780 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
782 /* Initialize the SACK header. */
783 sack
.cum_tsn_ack
= htonl(ctsn
);
784 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
785 sack
.num_gap_ack_blocks
= htons(num_gabs
);
786 sack
.num_dup_tsns
= htons(num_dup_tsns
);
789 + sizeof(struct sctp_gap_ack_block
) * num_gabs
790 + sizeof(__u32
) * num_dup_tsns
;
792 /* Create the chunk. */
793 retval
= sctp_make_control(asoc
, SCTP_CID_SACK
, 0, len
, GFP_ATOMIC
);
797 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
799 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
800 * HEARTBEAT ACK, etc.) to the same destination transport
801 * address from which it received the DATA or control chunk to
802 * which it is replying. This rule should also be followed if
803 * the endpoint is bundling DATA chunks together with the
806 * However, when acknowledging multiple DATA chunks received
807 * in packets from different source addresses in a single
808 * SACK, the SACK chunk may be transmitted to one of the
809 * destination transport addresses from which the DATA or
810 * control chunks being acknowledged were received.
812 * [BUG: We do not implement the following paragraph.
813 * Perhaps we should remember the last transport we used for a
814 * SACK and avoid that (if possible) if we have seen any
815 * duplicates. --piggy]
817 * When a receiver of a duplicate DATA chunk sends a SACK to a
818 * multi- homed endpoint it MAY be beneficial to vary the
819 * destination address and not use the source address of the
820 * DATA chunk. The reason being that receiving a duplicate
821 * from a multi-homed endpoint might indicate that the return
822 * path (as specified in the source address of the DATA chunk)
823 * for the SACK is broken.
825 * [Send to the address from which we last received a DATA chunk.]
827 retval
->transport
= asoc
->peer
.last_data_from
;
829 retval
->subh
.sack_hdr
=
830 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
832 /* Add the gap ack block information. */
834 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
837 /* Add the duplicate TSN information. */
839 aptr
->stats
.idupchunks
+= num_dup_tsns
;
840 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
841 sctp_tsnmap_get_dups(map
));
843 /* Once we have a sack generated, check to see what our sack
844 * generation is, if its 0, reset the transports to 0, and reset
845 * the association generation to 1
847 * The idea is that zero is never used as a valid generation for the
848 * association so no transport will match after a wrap event like this,
849 * Until the next sack
851 if (++aptr
->peer
.sack_generation
== 0) {
852 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
854 trans
->sack_generation
= 0;
855 aptr
->peer
.sack_generation
= 1;
861 /* Make a SHUTDOWN chunk. */
862 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
863 const struct sctp_chunk
*chunk
)
865 struct sctp_chunk
*retval
;
866 sctp_shutdownhdr_t shut
;
869 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
870 shut
.cum_tsn_ack
= htonl(ctsn
);
872 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN
, 0,
873 sizeof(sctp_shutdownhdr_t
), GFP_ATOMIC
);
877 retval
->subh
.shutdown_hdr
=
878 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
881 retval
->transport
= chunk
->transport
;
886 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
887 const struct sctp_chunk
*chunk
)
889 struct sctp_chunk
*retval
;
891 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0,
894 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
896 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
897 * HEARTBEAT ACK, * etc.) to the same destination transport
898 * address from which it * received the DATA or control chunk
899 * to which it is replying.
901 * [ACK back to where the SHUTDOWN came from.]
904 retval
->transport
= chunk
->transport
;
909 struct sctp_chunk
*sctp_make_shutdown_complete(
910 const struct sctp_association
*asoc
,
911 const struct sctp_chunk
*chunk
)
913 struct sctp_chunk
*retval
;
916 /* Set the T-bit if we have no association (vtag will be
919 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
921 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
,
924 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
926 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
927 * HEARTBEAT ACK, * etc.) to the same destination transport
928 * address from which it * received the DATA or control chunk
929 * to which it is replying.
931 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
935 retval
->transport
= chunk
->transport
;
940 /* Create an ABORT. Note that we set the T bit if we have no
941 * association, except when responding to an INIT (sctpimpguide 2.41).
943 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
944 const struct sctp_chunk
*chunk
,
947 struct sctp_chunk
*retval
;
950 /* Set the T-bit if we have no association and 'chunk' is not
951 * an INIT (vtag will be reflected).
954 if (chunk
&& chunk
->chunk_hdr
&&
955 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
958 flags
= SCTP_CHUNK_FLAG_T
;
961 retval
= sctp_make_control(asoc
, SCTP_CID_ABORT
, flags
, hint
,
964 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
966 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
967 * HEARTBEAT ACK, * etc.) to the same destination transport
968 * address from which it * received the DATA or control chunk
969 * to which it is replying.
971 * [ABORT back to where the offender came from.]
974 retval
->transport
= chunk
->transport
;
979 /* Helper to create ABORT with a NO_USER_DATA error. */
980 struct sctp_chunk
*sctp_make_abort_no_data(
981 const struct sctp_association
*asoc
,
982 const struct sctp_chunk
*chunk
, __u32 tsn
)
984 struct sctp_chunk
*retval
;
987 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
993 /* Put the tsn back into network byte order. */
994 payload
= htonl(tsn
);
995 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
996 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
998 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1000 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1001 * HEARTBEAT ACK, * etc.) to the same destination transport
1002 * address from which it * received the DATA or control chunk
1003 * to which it is replying.
1005 * [ABORT back to where the offender came from.]
1008 retval
->transport
= chunk
->transport
;
1014 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1015 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
1019 struct sctp_chunk
*retval
;
1020 void *payload
= NULL
;
1023 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
1028 /* Put the msg_iov together into payload. */
1029 payload
= kmalloc(paylen
, GFP_KERNEL
);
1033 err
= memcpy_from_msg(payload
, msg
, paylen
);
1038 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1039 sctp_addto_chunk(retval
, paylen
, payload
);
1049 sctp_chunk_free(retval
);
1055 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1058 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1062 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1064 target
= skb_put(chunk
->skb
, len
);
1067 memcpy(target
, data
, len
);
1069 memset(target
, 0, len
);
1071 /* Adjust the chunk length field. */
1072 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1073 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1078 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1079 struct sctp_chunk
*sctp_make_abort_violation(
1080 const struct sctp_association
*asoc
,
1081 const struct sctp_chunk
*chunk
,
1082 const __u8
*payload
,
1083 const size_t paylen
)
1085 struct sctp_chunk
*retval
;
1086 struct sctp_paramhdr phdr
;
1088 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1089 + sizeof(sctp_paramhdr_t
));
1093 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1094 + sizeof(sctp_paramhdr_t
));
1096 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1097 phdr
.length
= chunk
->chunk_hdr
->length
;
1098 sctp_addto_chunk(retval
, paylen
, payload
);
1099 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1105 struct sctp_chunk
*sctp_make_violation_paramlen(
1106 const struct sctp_association
*asoc
,
1107 const struct sctp_chunk
*chunk
,
1108 struct sctp_paramhdr
*param
)
1110 struct sctp_chunk
*retval
;
1111 static const char error
[] = "The following parameter had invalid length:";
1112 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1113 sizeof(sctp_paramhdr_t
);
1115 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1119 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1120 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1121 sctp_addto_chunk(retval
, sizeof(error
), error
);
1122 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1128 struct sctp_chunk
*sctp_make_violation_max_retrans(
1129 const struct sctp_association
*asoc
,
1130 const struct sctp_chunk
*chunk
)
1132 struct sctp_chunk
*retval
;
1133 static const char error
[] = "Association exceeded its max_retans count";
1134 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
);
1136 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1140 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1141 sctp_addto_chunk(retval
, sizeof(error
), error
);
1147 /* Make a HEARTBEAT chunk. */
1148 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1149 const struct sctp_transport
*transport
)
1151 struct sctp_chunk
*retval
;
1152 sctp_sender_hb_info_t hbinfo
;
1154 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT
, 0,
1155 sizeof(hbinfo
), GFP_ATOMIC
);
1160 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1161 hbinfo
.param_hdr
.length
= htons(sizeof(sctp_sender_hb_info_t
));
1162 hbinfo
.daddr
= transport
->ipaddr
;
1163 hbinfo
.sent_at
= jiffies
;
1164 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1166 /* Cast away the 'const', as this is just telling the chunk
1167 * what transport it belongs to.
1169 retval
->transport
= (struct sctp_transport
*) transport
;
1170 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1177 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1178 const struct sctp_chunk
*chunk
,
1179 const void *payload
, const size_t paylen
)
1181 struct sctp_chunk
*retval
;
1183 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
,
1188 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1190 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1192 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1193 * HEARTBEAT ACK, * etc.) to the same destination transport
1194 * address from which it * received the DATA or control chunk
1195 * to which it is replying.
1197 * [HBACK back to where the HEARTBEAT came from.]
1200 retval
->transport
= chunk
->transport
;
1206 /* Create an Operation Error chunk with the specified space reserved.
1207 * This routine can be used for containing multiple causes in the chunk.
1209 static struct sctp_chunk
*sctp_make_op_error_space(
1210 const struct sctp_association
*asoc
,
1211 const struct sctp_chunk
*chunk
,
1214 struct sctp_chunk
*retval
;
1216 retval
= sctp_make_control(asoc
, SCTP_CID_ERROR
, 0,
1217 sizeof(sctp_errhdr_t
) + size
, GFP_ATOMIC
);
1221 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1223 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1224 * HEARTBEAT ACK, etc.) to the same destination transport
1225 * address from which it received the DATA or control chunk
1226 * to which it is replying.
1230 retval
->transport
= chunk
->transport
;
1236 /* Create an Operation Error chunk of a fixed size,
1237 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1238 * This is a helper function to allocate an error chunk for
1239 * for those invalid parameter codes in which we may not want
1240 * to report all the errors, if the incoming chunk is large
1242 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1243 const struct sctp_association
*asoc
,
1244 const struct sctp_chunk
*chunk
)
1246 size_t size
= asoc
? asoc
->pathmtu
: 0;
1249 size
= SCTP_DEFAULT_MAXSEGMENT
;
1251 return sctp_make_op_error_space(asoc
, chunk
, size
);
1254 /* Create an Operation Error chunk. */
1255 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1256 const struct sctp_chunk
*chunk
,
1257 __be16 cause_code
, const void *payload
,
1258 size_t paylen
, size_t reserve_tail
)
1260 struct sctp_chunk
*retval
;
1262 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1266 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1267 sctp_addto_chunk(retval
, paylen
, payload
);
1269 sctp_addto_param(retval
, reserve_tail
, NULL
);
1275 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1277 struct sctp_chunk
*retval
;
1278 struct sctp_hmac
*hmac_desc
;
1279 struct sctp_authhdr auth_hdr
;
1282 /* Get the first hmac that the peer told us to use */
1283 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1284 if (unlikely(!hmac_desc
))
1287 retval
= sctp_make_control(asoc
, SCTP_CID_AUTH
, 0,
1288 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
),
1293 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1294 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1296 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1299 hmac
= skb_put_zero(retval
->skb
, hmac_desc
->hmac_len
);
1301 /* Adjust the chunk header to include the empty MAC */
1302 retval
->chunk_hdr
->length
=
1303 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1304 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1310 /********************************************************************
1311 * 2nd Level Abstractions
1312 ********************************************************************/
1314 /* Turn an skb into a chunk.
1315 * FIXME: Eventually move the structure directly inside the skb->cb[].
1317 * sctpimpguide-05.txt Section 2.8.2
1318 * M1) Each time a new DATA chunk is transmitted
1319 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1320 * 'TSN.Missing.Report' count will be used to determine missing chunks
1321 * and when to fast retransmit.
1324 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1325 const struct sctp_association
*asoc
,
1326 struct sock
*sk
, gfp_t gfp
)
1328 struct sctp_chunk
*retval
;
1330 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, gfp
);
1335 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1337 INIT_LIST_HEAD(&retval
->list
);
1339 retval
->asoc
= (struct sctp_association
*)asoc
;
1340 retval
->singleton
= 1;
1342 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1344 /* Polish the bead hole. */
1345 INIT_LIST_HEAD(&retval
->transmitted_list
);
1346 INIT_LIST_HEAD(&retval
->frag_list
);
1347 SCTP_DBG_OBJCNT_INC(chunk
);
1348 atomic_set(&retval
->refcnt
, 1);
1354 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1355 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1356 union sctp_addr
*dest
)
1358 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1359 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1362 /* Extract the source address from a chunk. */
1363 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1365 /* If we have a known transport, use that. */
1366 if (chunk
->transport
) {
1367 return &chunk
->transport
->ipaddr
;
1369 /* Otherwise, extract it from the IP header. */
1370 return &chunk
->source
;
1374 /* Create a new chunk, setting the type and flags headers from the
1375 * arguments, reserving enough space for a 'paylen' byte payload.
1377 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1378 __u8 type
, __u8 flags
, int paylen
,
1381 struct sctp_chunk
*retval
;
1382 sctp_chunkhdr_t
*chunk_hdr
;
1383 struct sk_buff
*skb
;
1386 /* No need to allocate LL here, as this is only a chunk. */
1387 skb
= alloc_skb(SCTP_PAD4(sizeof(sctp_chunkhdr_t
) + paylen
), gfp
);
1391 /* Make room for the chunk header. */
1392 chunk_hdr
= skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1393 chunk_hdr
->type
= type
;
1394 chunk_hdr
->flags
= flags
;
1395 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1397 sk
= asoc
? asoc
->base
.sk
: NULL
;
1398 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1404 retval
->chunk_hdr
= chunk_hdr
;
1405 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1407 /* Determine if the chunk needs to be authenticated */
1408 if (sctp_auth_send_cid(type
, asoc
))
1416 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1417 __u8 flags
, int paylen
, gfp_t gfp
)
1419 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1422 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1423 __u8 type
, __u8 flags
, int paylen
,
1426 struct sctp_chunk
*chunk
;
1428 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1430 sctp_control_set_owner_w(chunk
);
1435 /* Release the memory occupied by a chunk. */
1436 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1438 BUG_ON(!list_empty(&chunk
->list
));
1439 list_del_init(&chunk
->transmitted_list
);
1441 consume_skb(chunk
->skb
);
1442 consume_skb(chunk
->auth_chunk
);
1444 SCTP_DBG_OBJCNT_DEC(chunk
);
1445 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1448 /* Possibly, free the chunk. */
1449 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1451 /* Release our reference on the message tracker. */
1453 sctp_datamsg_put(chunk
->msg
);
1455 sctp_chunk_put(chunk
);
1458 /* Grab a reference to the chunk. */
1459 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1461 atomic_inc(&ch
->refcnt
);
1464 /* Release a reference to the chunk. */
1465 void sctp_chunk_put(struct sctp_chunk
*ch
)
1467 if (atomic_dec_and_test(&ch
->refcnt
))
1468 sctp_chunk_destroy(ch
);
1471 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1474 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1477 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1478 int padlen
= SCTP_PAD4(chunklen
) - chunklen
;
1480 skb_put_zero(chunk
->skb
, padlen
);
1481 target
= skb_put_data(chunk
->skb
, data
, len
);
1483 /* Adjust the chunk length field. */
1484 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1485 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1490 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1491 * space in the chunk
1493 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1494 int len
, const void *data
)
1496 if (skb_tailroom(chunk
->skb
) >= len
)
1497 return sctp_addto_chunk(chunk
, len
, data
);
1502 /* Append bytes from user space to the end of a chunk. Will panic if
1503 * chunk is not big enough.
1504 * Returns a kernel err value.
1506 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1507 struct iov_iter
*from
)
1511 /* Make room in chunk for data. */
1512 target
= skb_put(chunk
->skb
, len
);
1514 /* Copy data (whole iovec) into chunk */
1515 if (!copy_from_iter_full(target
, len
, from
))
1518 /* Adjust the chunk length field. */
1519 chunk
->chunk_hdr
->length
=
1520 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1521 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1526 /* Helper function to assign a TSN if needed. This assumes that both
1527 * the data_hdr and association have already been assigned.
1529 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1531 struct sctp_datamsg
*msg
;
1532 struct sctp_chunk
*lchunk
;
1533 struct sctp_stream
*stream
;
1540 /* All fragments will be on the same stream */
1541 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1542 stream
= &chunk
->asoc
->stream
;
1544 /* Now assign the sequence number to the entire message.
1545 * All fragments must have the same stream sequence number.
1548 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1549 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1552 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1553 ssn
= sctp_ssn_next(stream
, out
, sid
);
1555 ssn
= sctp_ssn_peek(stream
, out
, sid
);
1558 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1559 lchunk
->has_ssn
= 1;
1563 /* Helper function to assign a TSN if needed. This assumes that both
1564 * the data_hdr and association have already been assigned.
1566 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1568 if (!chunk
->has_tsn
) {
1569 /* This is the last possible instant to
1572 chunk
->subh
.data_hdr
->tsn
=
1573 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1578 /* Create a CLOSED association to use with an incoming packet. */
1579 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1580 struct sctp_chunk
*chunk
,
1583 struct sctp_association
*asoc
;
1584 struct sk_buff
*skb
;
1587 /* Create the bare association. */
1588 scope
= sctp_scope(sctp_source(chunk
));
1589 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1594 /* Create an entry for the source address of the packet. */
1595 SCTP_INPUT_CB(skb
)->af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1601 /* Build a cookie representing asoc.
1602 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1604 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1605 const struct sctp_association
*asoc
,
1606 const struct sctp_chunk
*init_chunk
,
1608 const __u8
*raw_addrs
, int addrs_len
)
1610 sctp_cookie_param_t
*retval
;
1611 struct sctp_signed_cookie
*cookie
;
1612 int headersize
, bodysize
;
1614 /* Header size is static data prior to the actual cookie, including
1617 headersize
= sizeof(sctp_paramhdr_t
) +
1618 (sizeof(struct sctp_signed_cookie
) -
1619 sizeof(struct sctp_cookie
));
1620 bodysize
= sizeof(struct sctp_cookie
)
1621 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1623 /* Pad out the cookie to a multiple to make the signature
1624 * functions simpler to write.
1626 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1627 bodysize
+= SCTP_COOKIE_MULTIPLE
1628 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1629 *cookie_len
= headersize
+ bodysize
;
1631 /* Clear this memory since we are sending this data structure
1632 * out on the network.
1634 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1638 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1640 /* Set up the parameter header. */
1641 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1642 retval
->p
.length
= htons(*cookie_len
);
1644 /* Copy the cookie part of the association itself. */
1645 cookie
->c
= asoc
->c
;
1646 /* Save the raw address list length in the cookie. */
1647 cookie
->c
.raw_addr_list_len
= addrs_len
;
1649 /* Remember PR-SCTP capability. */
1650 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1652 /* Save adaptation indication in the cookie. */
1653 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1655 /* Set an expiration time for the cookie. */
1656 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1659 /* Copy the peer's init packet. */
1660 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1661 ntohs(init_chunk
->chunk_hdr
->length
));
1663 /* Copy the raw local address list of the association. */
1664 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1665 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1667 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1668 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1671 /* Sign the message. */
1672 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1675 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1676 sizeof(ep
->secret_key
)) ?:
1677 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1679 shash_desc_zero(desc
);
1693 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1694 struct sctp_association
*sctp_unpack_cookie(
1695 const struct sctp_endpoint
*ep
,
1696 const struct sctp_association
*asoc
,
1697 struct sctp_chunk
*chunk
, gfp_t gfp
,
1698 int *error
, struct sctp_chunk
**errp
)
1700 struct sctp_association
*retval
= NULL
;
1701 struct sctp_signed_cookie
*cookie
;
1702 struct sctp_cookie
*bear_cookie
;
1703 int headersize
, bodysize
, fixed_size
;
1704 __u8
*digest
= ep
->digest
;
1707 struct sk_buff
*skb
= chunk
->skb
;
1710 /* Header size is static data prior to the actual cookie, including
1713 headersize
= sizeof(sctp_chunkhdr_t
) +
1714 (sizeof(struct sctp_signed_cookie
) -
1715 sizeof(struct sctp_cookie
));
1716 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1717 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1719 /* Verify that the chunk looks like it even has a cookie.
1720 * There must be enough room for our cookie and our peer's
1723 len
= ntohs(chunk
->chunk_hdr
->length
);
1724 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1727 /* Verify that the cookie has been padded out. */
1728 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1731 /* Process the cookie. */
1732 cookie
= chunk
->subh
.cookie_hdr
;
1733 bear_cookie
= &cookie
->c
;
1735 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1738 /* Check the signature. */
1740 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1743 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1746 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1747 sizeof(ep
->secret_key
)) ?:
1748 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1750 shash_desc_zero(desc
);
1753 *error
= -SCTP_IERROR_NOMEM
;
1758 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1759 *error
= -SCTP_IERROR_BAD_SIG
;
1764 /* IG Section 2.35.2:
1765 * 3) Compare the port numbers and the verification tag contained
1766 * within the COOKIE ECHO chunk to the actual port numbers and the
1767 * verification tag within the SCTP common header of the received
1768 * packet. If these values do not match the packet MUST be silently
1771 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1772 *error
= -SCTP_IERROR_BAD_TAG
;
1776 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1777 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1778 *error
= -SCTP_IERROR_BAD_PORTS
;
1782 /* Check to see if the cookie is stale. If there is already
1783 * an association, there is no need to check cookie's expiration
1784 * for init collision case of lost COOKIE ACK.
1785 * If skb has been timestamped, then use the stamp, otherwise
1786 * use current time. This introduces a small possibility that
1787 * that a cookie may be considered expired, but his would only slow
1788 * down the new association establishment instead of every packet.
1790 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1791 kt
= skb_get_ktime(skb
);
1793 kt
= ktime_get_real();
1795 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1797 * Section 3.3.10.3 Stale Cookie Error (3)
1801 * Stale Cookie Error: Indicates the receipt of a valid State
1802 * Cookie that has expired.
1804 len
= ntohs(chunk
->chunk_hdr
->length
);
1805 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1807 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1808 __be32 n
= htonl(usecs
);
1810 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1812 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1813 *error
= -SCTP_IERROR_STALE_COOKIE
;
1815 *error
= -SCTP_IERROR_NOMEM
;
1820 /* Make a new base association. */
1821 scope
= sctp_scope(sctp_source(chunk
));
1822 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1824 *error
= -SCTP_IERROR_NOMEM
;
1828 /* Set up our peer's port number. */
1829 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1831 /* Populate the association from the cookie. */
1832 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1834 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1836 *error
= -SCTP_IERROR_NOMEM
;
1840 /* Also, add the destination address. */
1841 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1842 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1843 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1847 retval
->next_tsn
= retval
->c
.initial_tsn
;
1848 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1849 retval
->addip_serial
= retval
->c
.initial_tsn
;
1850 retval
->strreset_outseq
= retval
->c
.initial_tsn
;
1851 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1852 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1853 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1855 /* The INIT stuff will be done by the side effects. */
1860 sctp_association_free(retval
);
1865 /* Yikes! The packet is either corrupt or deliberately
1868 *error
= -SCTP_IERROR_MALFORMED
;
1872 /********************************************************************
1873 * 3rd Level Abstractions
1874 ********************************************************************/
1876 struct __sctp_missing
{
1882 * Report a missing mandatory parameter.
1884 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1885 sctp_param_t paramtype
,
1886 struct sctp_chunk
*chunk
,
1887 struct sctp_chunk
**errp
)
1889 struct __sctp_missing report
;
1892 len
= SCTP_PAD4(sizeof(report
));
1894 /* Make an ERROR chunk, preparing enough room for
1895 * returning multiple unknown parameters.
1898 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1901 report
.num_missing
= htonl(1);
1902 report
.type
= paramtype
;
1903 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1905 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1908 /* Stop processing this chunk. */
1912 /* Report an Invalid Mandatory Parameter. */
1913 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1914 struct sctp_chunk
*chunk
,
1915 struct sctp_chunk
**errp
)
1917 /* Invalid Mandatory Parameter Error has no payload. */
1920 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1923 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1925 /* Stop processing this chunk. */
1929 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1930 struct sctp_paramhdr
*param
,
1931 const struct sctp_chunk
*chunk
,
1932 struct sctp_chunk
**errp
)
1934 /* This is a fatal error. Any accumulated non-fatal errors are
1938 sctp_chunk_free(*errp
);
1940 /* Create an error chunk and fill it in with our payload. */
1941 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1947 /* Do not attempt to handle the HOST_NAME parm. However, do
1948 * send back an indicator to the peer.
1950 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1951 union sctp_params param
,
1952 struct sctp_chunk
*chunk
,
1953 struct sctp_chunk
**errp
)
1955 __u16 len
= ntohs(param
.p
->length
);
1957 /* Processing of the HOST_NAME parameter will generate an
1958 * ABORT. If we've accumulated any non-fatal errors, they
1959 * would be unrecognized parameters and we should not include
1960 * them in the ABORT.
1963 sctp_chunk_free(*errp
);
1965 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1968 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1969 sctp_addto_chunk(*errp
, len
, param
.v
);
1972 /* Stop processing this chunk. */
1976 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1978 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1980 int have_asconf
= 0;
1983 for (i
= 0; i
< num_ext
; i
++) {
1984 switch (param
.ext
->chunks
[i
]) {
1988 case SCTP_CID_ASCONF
:
1989 case SCTP_CID_ASCONF_ACK
:
1995 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1996 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1997 * only if ADD-IP is turned on and we are not backward-compatible
2000 if (net
->sctp
.addip_noauth
)
2003 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
2009 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2010 union sctp_params param
)
2012 struct net
*net
= sock_net(asoc
->base
.sk
);
2013 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2016 for (i
= 0; i
< num_ext
; i
++) {
2017 switch (param
.ext
->chunks
[i
]) {
2018 case SCTP_CID_RECONF
:
2019 if (asoc
->reconf_enable
&&
2020 !asoc
->peer
.reconf_capable
)
2021 asoc
->peer
.reconf_capable
= 1;
2023 case SCTP_CID_FWD_TSN
:
2024 if (asoc
->prsctp_enable
&& !asoc
->peer
.prsctp_capable
)
2025 asoc
->peer
.prsctp_capable
= 1;
2028 /* if the peer reports AUTH, assume that he
2031 if (asoc
->ep
->auth_enable
)
2032 asoc
->peer
.auth_capable
= 1;
2034 case SCTP_CID_ASCONF
:
2035 case SCTP_CID_ASCONF_ACK
:
2036 if (net
->sctp
.addip_enable
)
2037 asoc
->peer
.asconf_capable
= 1;
2045 /* RFC 3.2.1 & the Implementers Guide 2.2.
2047 * The Parameter Types are encoded such that the
2048 * highest-order two bits specify the action that must be
2049 * taken if the processing endpoint does not recognize the
2052 * 00 - Stop processing this parameter; do not process any further
2053 * parameters within this chunk
2055 * 01 - Stop processing this parameter, do not process any further
2056 * parameters within this chunk, and report the unrecognized
2057 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2059 * 10 - Skip this parameter and continue processing.
2061 * 11 - Skip this parameter and continue processing but
2062 * report the unrecognized parameter in an
2063 * 'Unrecognized Parameter' ERROR chunk.
2066 * SCTP_IERROR_NO_ERROR - continue with the chunk
2067 * SCTP_IERROR_ERROR - stop and report an error.
2068 * SCTP_IERROR_NOMEME - out of memory.
2070 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2071 union sctp_params param
,
2072 struct sctp_chunk
*chunk
,
2073 struct sctp_chunk
**errp
)
2075 int retval
= SCTP_IERROR_NO_ERROR
;
2077 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2078 case SCTP_PARAM_ACTION_DISCARD
:
2079 retval
= SCTP_IERROR_ERROR
;
2081 case SCTP_PARAM_ACTION_SKIP
:
2083 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2084 retval
= SCTP_IERROR_ERROR
;
2086 case SCTP_PARAM_ACTION_SKIP_ERR
:
2087 /* Make an ERROR chunk, preparing enough room for
2088 * returning multiple unknown parameters.
2091 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2094 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2095 SCTP_PAD4(ntohs(param
.p
->length
))))
2096 sctp_addto_chunk_fixed(*errp
,
2097 SCTP_PAD4(ntohs(param
.p
->length
)),
2100 /* If there is no memory for generating the ERROR
2101 * report as specified, an ABORT will be triggered
2102 * to the peer and the association won't be
2105 retval
= SCTP_IERROR_NOMEM
;
2115 /* Verify variable length parameters
2117 * SCTP_IERROR_ABORT - trigger an ABORT
2118 * SCTP_IERROR_NOMEM - out of memory (abort)
2119 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2120 * SCTP_IERROR_NO_ERROR - continue with the chunk
2122 static sctp_ierror_t
sctp_verify_param(struct net
*net
,
2123 const struct sctp_endpoint
*ep
,
2124 const struct sctp_association
*asoc
,
2125 union sctp_params param
,
2127 struct sctp_chunk
*chunk
,
2128 struct sctp_chunk
**err_chunk
)
2130 struct sctp_hmac_algo_param
*hmacs
;
2131 int retval
= SCTP_IERROR_NO_ERROR
;
2132 __u16 n_elt
, id
= 0;
2135 /* FIXME - This routine is not looking at each parameter per the
2136 * chunk type, i.e., unrecognized parameters should be further
2137 * identified based on the chunk id.
2140 switch (param
.p
->type
) {
2141 case SCTP_PARAM_IPV4_ADDRESS
:
2142 case SCTP_PARAM_IPV6_ADDRESS
:
2143 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2144 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2145 case SCTP_PARAM_STATE_COOKIE
:
2146 case SCTP_PARAM_HEARTBEAT_INFO
:
2147 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2148 case SCTP_PARAM_ECN_CAPABLE
:
2149 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2152 case SCTP_PARAM_SUPPORTED_EXT
:
2153 if (!sctp_verify_ext_param(net
, param
))
2154 return SCTP_IERROR_ABORT
;
2157 case SCTP_PARAM_SET_PRIMARY
:
2158 if (net
->sctp
.addip_enable
)
2162 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2163 /* Tell the peer, we won't support this param. */
2164 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2165 retval
= SCTP_IERROR_ABORT
;
2168 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2169 if (ep
->prsctp_enable
)
2173 case SCTP_PARAM_RANDOM
:
2174 if (!ep
->auth_enable
)
2177 /* SCTP-AUTH: Secion 6.1
2178 * If the random number is not 32 byte long the association
2179 * MUST be aborted. The ABORT chunk SHOULD contain the error
2180 * cause 'Protocol Violation'.
2182 if (SCTP_AUTH_RANDOM_LENGTH
!=
2183 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2184 sctp_process_inv_paramlength(asoc
, param
.p
,
2186 retval
= SCTP_IERROR_ABORT
;
2190 case SCTP_PARAM_CHUNKS
:
2191 if (!ep
->auth_enable
)
2194 /* SCTP-AUTH: Section 3.2
2195 * The CHUNKS parameter MUST be included once in the INIT or
2196 * INIT-ACK chunk if the sender wants to receive authenticated
2197 * chunks. Its maximum length is 260 bytes.
2199 if (260 < ntohs(param
.p
->length
)) {
2200 sctp_process_inv_paramlength(asoc
, param
.p
,
2202 retval
= SCTP_IERROR_ABORT
;
2206 case SCTP_PARAM_HMAC_ALGO
:
2207 if (!ep
->auth_enable
)
2210 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2211 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2213 /* SCTP-AUTH: Section 6.1
2214 * The HMAC algorithm based on SHA-1 MUST be supported and
2215 * included in the HMAC-ALGO parameter.
2217 for (i
= 0; i
< n_elt
; i
++) {
2218 id
= ntohs(hmacs
->hmac_ids
[i
]);
2220 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2224 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2225 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2227 retval
= SCTP_IERROR_ABORT
;
2232 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2233 __func__
, ntohs(param
.p
->type
), cid
);
2235 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2241 /* Verify the INIT packet before we process it. */
2242 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2243 const struct sctp_association
*asoc
, sctp_cid_t cid
,
2244 sctp_init_chunk_t
*peer_init
, struct sctp_chunk
*chunk
,
2245 struct sctp_chunk
**errp
)
2247 union sctp_params param
;
2248 bool has_cookie
= false;
2251 /* Check for missing mandatory parameters. Note: Initial TSN is
2252 * also mandatory, but is not checked here since the valid range
2253 * is 0..2**32-1. RFC4960, section 3.3.3.
2255 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2256 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2257 peer_init
->init_hdr
.init_tag
== 0 ||
2258 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2259 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2261 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2262 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2266 /* There is a possibility that a parameter length was bad and
2267 * in that case we would have stoped walking the parameters.
2268 * The current param.p would point at the bad one.
2269 * Current consensus on the mailing list is to generate a PROTOCOL
2270 * VIOLATION error. We build the ERROR chunk here and let the normal
2271 * error handling code build and send the packet.
2273 if (param
.v
!= (void *)chunk
->chunk_end
)
2274 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2276 /* The only missing mandatory param possible today is
2277 * the state cookie for an INIT-ACK chunk.
2279 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2280 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2283 /* Verify all the variable length parameters */
2284 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2285 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2288 case SCTP_IERROR_ABORT
:
2289 case SCTP_IERROR_NOMEM
:
2291 case SCTP_IERROR_ERROR
:
2293 case SCTP_IERROR_NO_ERROR
:
2298 } /* for (loop through all parameters) */
2303 /* Unpack the parameters in an INIT packet into an association.
2304 * Returns 0 on failure, else success.
2305 * FIXME: This is an association method.
2307 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2308 const union sctp_addr
*peer_addr
,
2309 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2311 struct net
*net
= sock_net(asoc
->base
.sk
);
2312 union sctp_params param
;
2313 struct sctp_transport
*transport
;
2314 struct list_head
*pos
, *temp
;
2316 union sctp_addr addr
;
2320 /* We must include the address that the INIT packet came from.
2321 * This is the only address that matters for an INIT packet.
2322 * When processing a COOKIE ECHO, we retrieve the from address
2323 * of the INIT from the cookie.
2326 /* This implementation defaults to making the first transport
2327 * added as the primary transport. The source address seems to
2328 * be a a better choice than any of the embedded addresses.
2330 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2333 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2336 /* Process the initialization parameters. */
2337 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2338 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2339 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2340 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2341 af
->from_addr_param(&addr
, param
.addr
,
2342 chunk
->sctp_hdr
->source
, 0);
2343 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2347 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2351 /* source address of chunk may not match any valid address */
2355 /* AUTH: After processing the parameters, make sure that we
2356 * have all the required info to potentially do authentications.
2358 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2359 !asoc
->peer
.peer_hmacs
))
2360 asoc
->peer
.auth_capable
= 0;
2362 /* In a non-backward compatible mode, if the peer claims
2363 * support for ADD-IP but not AUTH, the ADD-IP spec states
2364 * that we MUST ABORT the association. Section 6. The section
2365 * also give us an option to silently ignore the packet, which
2366 * is what we'll do here.
2368 if (!net
->sctp
.addip_noauth
&&
2369 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2370 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2372 SCTP_PARAM_SET_PRIMARY
);
2373 asoc
->peer
.asconf_capable
= 0;
2377 /* Walk list of transports, removing transports in the UNKNOWN state. */
2378 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2379 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2380 if (transport
->state
== SCTP_UNKNOWN
) {
2381 sctp_assoc_rm_peer(asoc
, transport
);
2385 /* The fixed INIT headers are always in network byte
2388 asoc
->peer
.i
.init_tag
=
2389 ntohl(peer_init
->init_hdr
.init_tag
);
2390 asoc
->peer
.i
.a_rwnd
=
2391 ntohl(peer_init
->init_hdr
.a_rwnd
);
2392 asoc
->peer
.i
.num_outbound_streams
=
2393 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2394 asoc
->peer
.i
.num_inbound_streams
=
2395 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2396 asoc
->peer
.i
.initial_tsn
=
2397 ntohl(peer_init
->init_hdr
.initial_tsn
);
2399 asoc
->strreset_inseq
= asoc
->peer
.i
.initial_tsn
;
2401 /* Apply the upper bounds for output streams based on peer's
2402 * number of inbound streams.
2404 if (asoc
->c
.sinit_num_ostreams
>
2405 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2406 asoc
->c
.sinit_num_ostreams
=
2407 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2410 if (asoc
->c
.sinit_max_instreams
>
2411 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2412 asoc
->c
.sinit_max_instreams
=
2413 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2416 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2417 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2419 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2420 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2422 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2423 cookie
= asoc
->peer
.cookie
;
2425 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2426 if (!asoc
->peer
.cookie
)
2430 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2431 * high (for example, implementations MAY use the size of the receiver
2432 * advertised window).
2434 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2436 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2439 /* Set up the TSN tracking pieces. */
2440 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2441 asoc
->peer
.i
.initial_tsn
, gfp
))
2444 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2446 * The stream sequence number in all the streams shall start
2447 * from 0 when the association is established. Also, when the
2448 * stream sequence number reaches the value 65535 the next
2449 * stream sequence number shall be set to 0.
2452 if (sctp_stream_init(&asoc
->stream
, asoc
->c
.sinit_num_ostreams
,
2453 asoc
->c
.sinit_max_instreams
, gfp
))
2456 if (!asoc
->temp
&& sctp_assoc_set_id(asoc
, gfp
))
2459 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2461 * When an endpoint has an ASCONF signaled change to be sent to the
2462 * remote endpoint it should do the following:
2464 * A2) A serial number should be assigned to the Chunk. The serial
2465 * number should be a monotonically increasing number. All serial
2466 * numbers are defined to be initialized at the start of the
2467 * association to the same value as the Initial TSN.
2469 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2473 /* Release the transport structures. */
2474 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2475 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2476 if (transport
->state
!= SCTP_ACTIVE
)
2477 sctp_assoc_rm_peer(asoc
, transport
);
2485 /* Update asoc with the option described in param.
2487 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2489 * asoc is the association to update.
2490 * param is the variable length parameter to use for update.
2491 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2492 * If the current packet is an INIT we want to minimize the amount of
2493 * work we do. In particular, we should not build transport
2494 * structures for the addresses.
2496 static int sctp_process_param(struct sctp_association
*asoc
,
2497 union sctp_params param
,
2498 const union sctp_addr
*peer_addr
,
2501 struct net
*net
= sock_net(asoc
->base
.sk
);
2502 union sctp_addr addr
;
2509 union sctp_addr_param
*addr_param
;
2510 struct sctp_transport
*t
;
2511 struct sctp_endpoint
*ep
= asoc
->ep
;
2513 /* We maintain all INIT parameters in network byte order all the
2514 * time. This allows us to not worry about whether the parameters
2515 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2517 switch (param
.p
->type
) {
2518 case SCTP_PARAM_IPV6_ADDRESS
:
2519 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2523 case SCTP_PARAM_IPV4_ADDRESS
:
2524 /* v4 addresses are not allowed on v6-only socket */
2525 if (ipv6_only_sock(asoc
->base
.sk
))
2528 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2529 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2530 scope
= sctp_scope(peer_addr
);
2531 if (sctp_in_scope(net
, &addr
, scope
))
2532 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2536 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2537 if (!net
->sctp
.cookie_preserve_enable
)
2540 stale
= ntohl(param
.life
->lifespan_increment
);
2542 /* Suggested Cookie Life span increment's unit is msec,
2545 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2548 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2549 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2552 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2553 /* Turn off the default values first so we'll know which
2554 * ones are really set by the peer.
2556 asoc
->peer
.ipv4_address
= 0;
2557 asoc
->peer
.ipv6_address
= 0;
2559 /* Assume that peer supports the address family
2560 * by which it sends a packet.
2562 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2563 asoc
->peer
.ipv6_address
= 1;
2564 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2565 asoc
->peer
.ipv4_address
= 1;
2567 /* Cycle through address types; avoid divide by 0. */
2568 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2570 sat
/= sizeof(__u16
);
2572 for (i
= 0; i
< sat
; ++i
) {
2573 switch (param
.sat
->types
[i
]) {
2574 case SCTP_PARAM_IPV4_ADDRESS
:
2575 asoc
->peer
.ipv4_address
= 1;
2578 case SCTP_PARAM_IPV6_ADDRESS
:
2579 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2580 asoc
->peer
.ipv6_address
= 1;
2583 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2584 asoc
->peer
.hostname_address
= 1;
2587 default: /* Just ignore anything else. */
2593 case SCTP_PARAM_STATE_COOKIE
:
2594 asoc
->peer
.cookie_len
=
2595 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2596 asoc
->peer
.cookie
= param
.cookie
->body
;
2599 case SCTP_PARAM_HEARTBEAT_INFO
:
2600 /* Would be odd to receive, but it causes no problems. */
2603 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2604 /* Rejected during verify stage. */
2607 case SCTP_PARAM_ECN_CAPABLE
:
2608 asoc
->peer
.ecn_capable
= 1;
2611 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2612 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2615 case SCTP_PARAM_SET_PRIMARY
:
2616 if (!net
->sctp
.addip_enable
)
2619 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2621 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2625 af
->from_addr_param(&addr
, addr_param
,
2626 htons(asoc
->peer
.port
), 0);
2628 /* if the address is invalid, we can't process it.
2629 * XXX: see spec for what to do.
2631 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2634 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2638 sctp_assoc_set_primary(asoc
, t
);
2641 case SCTP_PARAM_SUPPORTED_EXT
:
2642 sctp_process_ext_param(asoc
, param
);
2645 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2646 if (asoc
->prsctp_enable
) {
2647 asoc
->peer
.prsctp_capable
= 1;
2653 case SCTP_PARAM_RANDOM
:
2654 if (!ep
->auth_enable
)
2657 /* Save peer's random parameter */
2658 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2659 ntohs(param
.p
->length
), gfp
);
2660 if (!asoc
->peer
.peer_random
) {
2666 case SCTP_PARAM_HMAC_ALGO
:
2667 if (!ep
->auth_enable
)
2670 /* Save peer's HMAC list */
2671 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2672 ntohs(param
.p
->length
), gfp
);
2673 if (!asoc
->peer
.peer_hmacs
) {
2678 /* Set the default HMAC the peer requested*/
2679 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2682 case SCTP_PARAM_CHUNKS
:
2683 if (!ep
->auth_enable
)
2686 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2687 ntohs(param
.p
->length
), gfp
);
2688 if (!asoc
->peer
.peer_chunks
)
2693 /* Any unrecognized parameters should have been caught
2694 * and handled by sctp_verify_param() which should be
2695 * called prior to this routine. Simply log the error
2698 pr_debug("%s: ignoring param:%d for association:%p.\n",
2699 __func__
, ntohs(param
.p
->type
), asoc
);
2706 /* Select a new verification tag. */
2707 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2709 /* I believe that this random number generator complies with RFC1750.
2710 * A tag of 0 is reserved for special cases (e.g. INIT).
2715 get_random_bytes(&x
, sizeof(__u32
));
2721 /* Select an initial TSN to send during startup. */
2722 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2726 get_random_bytes(&retval
, sizeof(__u32
));
2731 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2733 * 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
2734 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2735 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2739 * | Address Parameter |
2740 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * | ASCONF Parameter #1 |
2742 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2746 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2747 * | ASCONF Parameter #N |
2748 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * Address Parameter and other parameter will not be wrapped in this function
2752 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2753 union sctp_addr
*addr
,
2756 sctp_addiphdr_t asconf
;
2757 struct sctp_chunk
*retval
;
2758 int length
= sizeof(asconf
) + vparam_len
;
2759 union sctp_addr_param addrparam
;
2761 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2763 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2768 /* Create the chunk. */
2769 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2774 asconf
.serial
= htonl(asoc
->addip_serial
++);
2776 retval
->subh
.addip_hdr
=
2777 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2778 retval
->param_hdr
.v
=
2779 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2785 * 3.2.1 Add IP Address
2787 * 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
2788 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * | Type = 0xC001 | Length = Variable |
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | ASCONF-Request Correlation ID |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 * | Address Parameter |
2794 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2796 * 3.2.2 Delete IP Address
2798 * 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
2799 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2800 * | Type = 0xC002 | Length = Variable |
2801 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2802 * | ASCONF-Request Correlation ID |
2803 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2804 * | Address Parameter |
2805 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2808 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2809 union sctp_addr
*laddr
,
2810 struct sockaddr
*addrs
,
2814 sctp_addip_param_t param
;
2815 struct sctp_chunk
*retval
;
2816 union sctp_addr_param addr_param
;
2817 union sctp_addr
*addr
;
2820 int paramlen
= sizeof(param
);
2821 int addr_param_len
= 0;
2826 /* Get total length of all the address parameters. */
2828 for (i
= 0; i
< addrcnt
; i
++) {
2830 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2831 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2833 totallen
+= paramlen
;
2834 totallen
+= addr_param_len
;
2836 addr_buf
+= af
->sockaddr_len
;
2837 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2838 /* reuse the parameter length from the same scope one */
2839 totallen
+= paramlen
;
2840 totallen
+= addr_param_len
;
2843 pr_debug("%s: picked same-scope del_pending addr, "
2844 "totallen for all addresses is %d\n",
2845 __func__
, totallen
);
2849 /* Create an asconf chunk with the required length. */
2850 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2854 /* Add the address parameters to the asconf chunk. */
2856 for (i
= 0; i
< addrcnt
; i
++) {
2858 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2859 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2860 param
.param_hdr
.type
= flags
;
2861 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2864 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2865 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2867 addr_buf
+= af
->sockaddr_len
;
2869 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2870 addr
= asoc
->asconf_addr_del_pending
;
2871 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2872 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2873 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2874 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2877 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2878 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2884 * 3.2.4 Set Primary IP Address
2886 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2887 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2888 * | Type =0xC004 | Length = Variable |
2889 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2890 * | ASCONF-Request Correlation ID |
2891 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2892 * | Address Parameter |
2893 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2895 * Create an ASCONF chunk with Set Primary IP address parameter.
2897 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2898 union sctp_addr
*addr
)
2900 sctp_addip_param_t param
;
2901 struct sctp_chunk
*retval
;
2902 int len
= sizeof(param
);
2903 union sctp_addr_param addrparam
;
2905 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2907 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2912 /* Create the chunk and make asconf header. */
2913 retval
= sctp_make_asconf(asoc
, addr
, len
);
2917 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2918 param
.param_hdr
.length
= htons(len
);
2921 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2922 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2927 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2929 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2930 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2931 * | Type = 0x80 | Chunk Flags | Chunk Length |
2932 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2934 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * | ASCONF Parameter Response#1 |
2936 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2941 * | ASCONF Parameter Response#N |
2942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2944 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2946 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2947 __u32 serial
, int vparam_len
)
2949 sctp_addiphdr_t asconf
;
2950 struct sctp_chunk
*retval
;
2951 int length
= sizeof(asconf
) + vparam_len
;
2953 /* Create the chunk. */
2954 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2959 asconf
.serial
= htonl(serial
);
2961 retval
->subh
.addip_hdr
=
2962 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2967 /* Add response parameters to an ASCONF_ACK chunk. */
2968 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2969 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2971 sctp_addip_param_t ack_param
;
2972 sctp_errhdr_t err_param
;
2973 int asconf_param_len
= 0;
2974 int err_param_len
= 0;
2975 __be16 response_type
;
2977 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2978 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2980 response_type
= SCTP_PARAM_ERR_CAUSE
;
2981 err_param_len
= sizeof(err_param
);
2984 ntohs(asconf_param
->param_hdr
.length
);
2987 /* Add Success Indication or Error Cause Indication parameter. */
2988 ack_param
.param_hdr
.type
= response_type
;
2989 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2992 ack_param
.crr_id
= crr_id
;
2993 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2995 if (SCTP_ERROR_NO_ERROR
== err_code
)
2998 /* Add Error Cause parameter. */
2999 err_param
.cause
= err_code
;
3000 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
3001 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
3003 /* Add the failed TLV copied from ASCONF chunk. */
3005 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3008 /* Process a asconf parameter. */
3009 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3010 struct sctp_chunk
*asconf
,
3011 sctp_addip_param_t
*asconf_param
)
3013 struct sctp_transport
*peer
;
3015 union sctp_addr addr
;
3016 union sctp_addr_param
*addr_param
;
3018 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3020 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3021 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3022 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3023 return SCTP_ERROR_UNKNOWN_PARAM
;
3025 switch (addr_param
->p
.type
) {
3026 case SCTP_PARAM_IPV6_ADDRESS
:
3027 if (!asoc
->peer
.ipv6_address
)
3028 return SCTP_ERROR_DNS_FAILED
;
3030 case SCTP_PARAM_IPV4_ADDRESS
:
3031 if (!asoc
->peer
.ipv4_address
)
3032 return SCTP_ERROR_DNS_FAILED
;
3035 return SCTP_ERROR_DNS_FAILED
;
3038 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3040 return SCTP_ERROR_DNS_FAILED
;
3042 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3044 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3045 * or multicast address.
3046 * (note: wildcard is permitted and requires special handling so
3047 * make sure we check for that)
3049 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3050 return SCTP_ERROR_DNS_FAILED
;
3052 switch (asconf_param
->param_hdr
.type
) {
3053 case SCTP_PARAM_ADD_IP
:
3055 * If the address 0.0.0.0 or ::0 is provided, the source
3056 * address of the packet MUST be added.
3058 if (af
->is_any(&addr
))
3059 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3061 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3062 * request and does not have the local resources to add this
3063 * new address to the association, it MUST return an Error
3064 * Cause TLV set to the new error code 'Operation Refused
3065 * Due to Resource Shortage'.
3068 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3070 return SCTP_ERROR_RSRC_LOW
;
3072 /* Start the heartbeat timer. */
3073 sctp_transport_reset_hb_timer(peer
);
3074 asoc
->new_transport
= peer
;
3076 case SCTP_PARAM_DEL_IP
:
3077 /* ADDIP 4.3 D7) If a request is received to delete the
3078 * last remaining IP address of a peer endpoint, the receiver
3079 * MUST send an Error Cause TLV with the error cause set to the
3080 * new error code 'Request to Delete Last Remaining IP Address'.
3082 if (asoc
->peer
.transport_count
== 1)
3083 return SCTP_ERROR_DEL_LAST_IP
;
3085 /* ADDIP 4.3 D8) If a request is received to delete an IP
3086 * address which is also the source address of the IP packet
3087 * which contained the ASCONF chunk, the receiver MUST reject
3088 * this request. To reject the request the receiver MUST send
3089 * an Error Cause TLV set to the new error code 'Request to
3090 * Delete Source IP Address'
3092 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3093 return SCTP_ERROR_DEL_SRC_IP
;
3096 * If the address 0.0.0.0 or ::0 is provided, all
3097 * addresses of the peer except the source address of the
3098 * packet MUST be deleted.
3100 if (af
->is_any(&addr
)) {
3101 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3102 sctp_assoc_del_nonprimary_peers(asoc
,
3104 return SCTP_ERROR_NO_ERROR
;
3107 /* If the address is not part of the association, the
3108 * ASCONF-ACK with Error Cause Indication Parameter
3109 * which including cause of Unresolvable Address should
3112 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3114 return SCTP_ERROR_DNS_FAILED
;
3116 sctp_assoc_rm_peer(asoc
, peer
);
3118 case SCTP_PARAM_SET_PRIMARY
:
3119 /* ADDIP Section 4.2.4
3120 * If the address 0.0.0.0 or ::0 is provided, the receiver
3121 * MAY mark the source address of the packet as its
3124 if (af
->is_any(&addr
))
3125 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3127 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3129 return SCTP_ERROR_DNS_FAILED
;
3131 sctp_assoc_set_primary(asoc
, peer
);
3135 return SCTP_ERROR_NO_ERROR
;
3138 /* Verify the ASCONF packet before we process it. */
3139 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3140 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3141 struct sctp_paramhdr
**errp
)
3143 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) chunk
->chunk_hdr
;
3144 union sctp_params param
;
3145 bool addr_param_seen
= false;
3147 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3148 size_t length
= ntohs(param
.p
->length
);
3151 switch (param
.p
->type
) {
3152 case SCTP_PARAM_ERR_CAUSE
:
3154 case SCTP_PARAM_IPV4_ADDRESS
:
3155 if (length
!= sizeof(sctp_ipv4addr_param_t
))
3157 /* ensure there is only one addr param and it's in the
3158 * beginning of addip_hdr params, or we reject it.
3160 if (param
.v
!= addip
->addip_hdr
.params
)
3162 addr_param_seen
= true;
3164 case SCTP_PARAM_IPV6_ADDRESS
:
3165 if (length
!= sizeof(sctp_ipv6addr_param_t
))
3167 if (param
.v
!= addip
->addip_hdr
.params
)
3169 addr_param_seen
= true;
3171 case SCTP_PARAM_ADD_IP
:
3172 case SCTP_PARAM_DEL_IP
:
3173 case SCTP_PARAM_SET_PRIMARY
:
3174 /* In ASCONF chunks, these need to be first. */
3175 if (addr_param_needed
&& !addr_param_seen
)
3177 length
= ntohs(param
.addip
->param_hdr
.length
);
3178 if (length
< sizeof(sctp_addip_param_t
) +
3179 sizeof(sctp_paramhdr_t
))
3182 case SCTP_PARAM_SUCCESS_REPORT
:
3183 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3184 if (length
!= sizeof(sctp_addip_param_t
))
3188 /* This is unkown to us, reject! */
3193 /* Remaining sanity checks. */
3194 if (addr_param_needed
&& !addr_param_seen
)
3196 if (!addr_param_needed
&& addr_param_seen
)
3198 if (param
.v
!= chunk
->chunk_end
)
3204 /* Process an incoming ASCONF chunk with the next expected serial no. and
3205 * return an ASCONF_ACK chunk to be sent in response.
3207 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3208 struct sctp_chunk
*asconf
)
3210 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) asconf
->chunk_hdr
;
3211 bool all_param_pass
= true;
3212 union sctp_params param
;
3213 sctp_addiphdr_t
*hdr
;
3214 union sctp_addr_param
*addr_param
;
3215 struct sctp_chunk
*asconf_ack
;
3221 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3222 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3223 serial
= ntohl(hdr
->serial
);
3225 /* Skip the addiphdr and store a pointer to address parameter. */
3226 length
= sizeof(sctp_addiphdr_t
);
3227 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3228 chunk_len
-= length
;
3230 /* Skip the address parameter and store a pointer to the first
3233 length
= ntohs(addr_param
->p
.length
);
3234 chunk_len
-= length
;
3236 /* create an ASCONF_ACK chunk.
3237 * Based on the definitions of parameters, we know that the size of
3238 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3241 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3245 /* Process the TLVs contained within the ASCONF chunk. */
3246 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3247 /* Skip preceeding address parameters. */
3248 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3249 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3252 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3255 * If an error response is received for a TLV parameter,
3256 * all TLVs with no response before the failed TLV are
3257 * considered successful if not reported. All TLVs after
3258 * the failed response are considered unsuccessful unless
3259 * a specific success indication is present for the parameter.
3261 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3262 all_param_pass
= false;
3263 if (!all_param_pass
)
3264 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3265 err_code
, param
.addip
);
3267 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3268 * an IP address sends an 'Out of Resource' in its response, it
3269 * MUST also fail any subsequent add or delete requests bundled
3272 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3276 asoc
->peer
.addip_serial
++;
3278 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3279 * after freeing the reference to old asconf ack if any.
3282 sctp_chunk_hold(asconf_ack
);
3283 list_add_tail(&asconf_ack
->transmitted_list
,
3284 &asoc
->asconf_ack_list
);
3290 /* Process a asconf parameter that is successfully acked. */
3291 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3292 sctp_addip_param_t
*asconf_param
)
3295 union sctp_addr addr
;
3296 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3297 union sctp_addr_param
*addr_param
;
3298 struct sctp_transport
*transport
;
3299 struct sctp_sockaddr_entry
*saddr
;
3301 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3303 /* We have checked the packet before, so we do not check again. */
3304 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3305 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3307 switch (asconf_param
->param_hdr
.type
) {
3308 case SCTP_PARAM_ADD_IP
:
3309 /* This is always done in BH context with a socket lock
3310 * held, so the list can not change.
3313 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3314 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3315 saddr
->state
= SCTP_ADDR_SRC
;
3318 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3320 sctp_transport_dst_release(transport
);
3323 case SCTP_PARAM_DEL_IP
:
3325 sctp_del_bind_addr(bp
, &addr
);
3326 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3327 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3328 kfree(asoc
->asconf_addr_del_pending
);
3329 asoc
->asconf_addr_del_pending
= NULL
;
3332 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3334 sctp_transport_dst_release(transport
);
3342 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3343 * for the given asconf parameter. If there is no response for this parameter,
3344 * return the error code based on the third argument 'no_err'.
3346 * A7) If an error response is received for a TLV parameter, all TLVs with no
3347 * response before the failed TLV are considered successful if not reported.
3348 * All TLVs after the failed response are considered unsuccessful unless a
3349 * specific success indication is present for the parameter.
3351 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3352 sctp_addip_param_t
*asconf_param
,
3355 sctp_addip_param_t
*asconf_ack_param
;
3356 sctp_errhdr_t
*err_param
;
3362 err_code
= SCTP_ERROR_NO_ERROR
;
3364 err_code
= SCTP_ERROR_REQ_REFUSED
;
3366 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3367 sizeof(sctp_chunkhdr_t
);
3369 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3370 * the first asconf_ack parameter.
3372 length
= sizeof(sctp_addiphdr_t
);
3373 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3375 asconf_ack_len
-= length
;
3377 while (asconf_ack_len
> 0) {
3378 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3379 switch (asconf_ack_param
->param_hdr
.type
) {
3380 case SCTP_PARAM_SUCCESS_REPORT
:
3381 return SCTP_ERROR_NO_ERROR
;
3382 case SCTP_PARAM_ERR_CAUSE
:
3383 length
= sizeof(sctp_addip_param_t
);
3384 err_param
= (void *)asconf_ack_param
+ length
;
3385 asconf_ack_len
-= length
;
3386 if (asconf_ack_len
> 0)
3387 return err_param
->cause
;
3389 return SCTP_ERROR_INV_PARAM
;
3392 return SCTP_ERROR_INV_PARAM
;
3396 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3397 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3398 asconf_ack_len
-= length
;
3404 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3405 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3406 struct sctp_chunk
*asconf_ack
)
3408 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3409 union sctp_addr_param
*addr_param
;
3410 sctp_addip_param_t
*asconf_param
;
3412 int asconf_len
= asconf
->skb
->len
;
3413 int all_param_pass
= 0;
3416 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3418 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3419 * a pointer to address parameter.
3421 length
= sizeof(sctp_addip_chunk_t
);
3422 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3423 asconf_len
-= length
;
3425 /* Skip the address parameter in the last asconf sent and store a
3426 * pointer to the first asconf parameter.
3428 length
= ntohs(addr_param
->p
.length
);
3429 asconf_param
= (void *)addr_param
+ length
;
3430 asconf_len
-= length
;
3433 * A8) If there is no response(s) to specific TLV parameter(s), and no
3434 * failures are indicated, then all request(s) are considered
3437 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3440 /* Process the TLVs contained in the last sent ASCONF chunk. */
3441 while (asconf_len
> 0) {
3443 err_code
= SCTP_ERROR_NO_ERROR
;
3445 err_code
= sctp_get_asconf_response(asconf_ack
,
3448 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3453 case SCTP_ERROR_NO_ERROR
:
3454 sctp_asconf_param_success(asoc
, asconf_param
);
3457 case SCTP_ERROR_RSRC_LOW
:
3461 case SCTP_ERROR_UNKNOWN_PARAM
:
3462 /* Disable sending this type of asconf parameter in
3465 asoc
->peer
.addip_disabled_mask
|=
3466 asconf_param
->param_hdr
.type
;
3469 case SCTP_ERROR_REQ_REFUSED
:
3470 case SCTP_ERROR_DEL_LAST_IP
:
3471 case SCTP_ERROR_DEL_SRC_IP
:
3476 /* Skip the processed asconf parameter and move to the next
3479 length
= ntohs(asconf_param
->param_hdr
.length
);
3480 asconf_param
= (void *)asconf_param
+ length
;
3481 asconf_len
-= length
;
3484 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3485 asoc
->src_out_of_asoc_ok
= 0;
3486 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3489 /* Free the cached last sent asconf chunk. */
3490 list_del_init(&asconf
->transmitted_list
);
3491 sctp_chunk_free(asconf
);
3492 asoc
->addip_last_asconf
= NULL
;
3497 /* Make a FWD TSN chunk. */
3498 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3499 __u32 new_cum_tsn
, size_t nstreams
,
3500 struct sctp_fwdtsn_skip
*skiplist
)
3502 struct sctp_chunk
*retval
= NULL
;
3503 struct sctp_fwdtsn_hdr ftsn_hdr
;
3504 struct sctp_fwdtsn_skip skip
;
3508 hint
= (nstreams
+ 1) * sizeof(__u32
);
3510 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3515 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3516 retval
->subh
.fwdtsn_hdr
=
3517 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3519 for (i
= 0; i
< nstreams
; i
++) {
3520 skip
.stream
= skiplist
[i
].stream
;
3521 skip
.ssn
= skiplist
[i
].ssn
;
3522 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);
3528 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3530 * 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
3531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3532 * | Type = 130 | Chunk Flags | Chunk Length |
3533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3535 * / Re-configuration Parameter /
3537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3539 * / Re-configuration Parameter (optional) /
3541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3543 static struct sctp_chunk
*sctp_make_reconf(
3544 const struct sctp_association
*asoc
,
3547 struct sctp_reconf_chunk
*reconf
;
3548 struct sctp_chunk
*retval
;
3550 retval
= sctp_make_control(asoc
, SCTP_CID_RECONF
, 0, length
,
3555 reconf
= (struct sctp_reconf_chunk
*)retval
->chunk_hdr
;
3556 retval
->param_hdr
.v
= reconf
->params
;
3561 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3563 * 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
3564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3565 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3567 * | Re-configuration Request Sequence Number |
3568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3569 * | Re-configuration Response Sequence Number |
3570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3571 * | Sender's Last Assigned TSN |
3572 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3573 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3574 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3576 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3577 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3578 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3580 * RE-CONFIG 4.2 (STREAM IN RESET)
3582 * 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
3583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3584 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3585 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3586 * | Re-configuration Request Sequence Number |
3587 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3588 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3589 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3591 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3592 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3593 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3595 struct sctp_chunk
*sctp_make_strreset_req(
3596 const struct sctp_association
*asoc
,
3597 __u16 stream_num
, __u16
*stream_list
,
3600 struct sctp_strreset_outreq outreq
;
3601 __u16 stream_len
= stream_num
* 2;
3602 struct sctp_strreset_inreq inreq
;
3603 struct sctp_chunk
*retval
;
3604 __u16 outlen
, inlen
;
3606 outlen
= (sizeof(outreq
) + stream_len
) * out
;
3607 inlen
= (sizeof(inreq
) + stream_len
) * in
;
3609 retval
= sctp_make_reconf(asoc
, outlen
+ inlen
);
3614 outreq
.param_hdr
.type
= SCTP_PARAM_RESET_OUT_REQUEST
;
3615 outreq
.param_hdr
.length
= htons(outlen
);
3616 outreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3617 outreq
.response_seq
= htonl(asoc
->strreset_inseq
- 1);
3618 outreq
.send_reset_at_tsn
= htonl(asoc
->next_tsn
- 1);
3620 sctp_addto_chunk(retval
, sizeof(outreq
), &outreq
);
3623 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3627 inreq
.param_hdr
.type
= SCTP_PARAM_RESET_IN_REQUEST
;
3628 inreq
.param_hdr
.length
= htons(inlen
);
3629 inreq
.request_seq
= htonl(asoc
->strreset_outseq
+ out
);
3631 sctp_addto_chunk(retval
, sizeof(inreq
), &inreq
);
3634 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3640 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3642 * 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
3643 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3644 * | Parameter Type = 15 | Parameter Length = 8 |
3645 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3646 * | Re-configuration Request Sequence Number |
3647 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3649 struct sctp_chunk
*sctp_make_strreset_tsnreq(
3650 const struct sctp_association
*asoc
)
3652 struct sctp_strreset_tsnreq tsnreq
;
3653 __u16 length
= sizeof(tsnreq
);
3654 struct sctp_chunk
*retval
;
3656 retval
= sctp_make_reconf(asoc
, length
);
3660 tsnreq
.param_hdr
.type
= SCTP_PARAM_RESET_TSN_REQUEST
;
3661 tsnreq
.param_hdr
.length
= htons(length
);
3662 tsnreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3664 sctp_addto_chunk(retval
, sizeof(tsnreq
), &tsnreq
);
3669 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3671 * 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
3672 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3673 * | Parameter Type = 17 | Parameter Length = 12 |
3674 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3675 * | Re-configuration Request Sequence Number |
3676 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3677 * | Number of new streams | Reserved |
3678 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3680 struct sctp_chunk
*sctp_make_strreset_addstrm(
3681 const struct sctp_association
*asoc
,
3682 __u16 out
, __u16 in
)
3684 struct sctp_strreset_addstrm addstrm
;
3685 __u16 size
= sizeof(addstrm
);
3686 struct sctp_chunk
*retval
;
3688 retval
= sctp_make_reconf(asoc
, (!!out
+ !!in
) * size
);
3693 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_OUT_STREAMS
;
3694 addstrm
.param_hdr
.length
= htons(size
);
3695 addstrm
.number_of_streams
= htons(out
);
3696 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
);
3697 addstrm
.reserved
= 0;
3699 sctp_addto_chunk(retval
, size
, &addstrm
);
3703 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_IN_STREAMS
;
3704 addstrm
.param_hdr
.length
= htons(size
);
3705 addstrm
.number_of_streams
= htons(in
);
3706 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
+ !!out
);
3707 addstrm
.reserved
= 0;
3709 sctp_addto_chunk(retval
, size
, &addstrm
);
3715 /* RE-CONFIG 4.4 (RESP)
3717 * 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
3718 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3719 * | Parameter Type = 16 | Parameter Length |
3720 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3721 * | Re-configuration Response Sequence Number |
3722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3726 struct sctp_chunk
*sctp_make_strreset_resp(
3727 const struct sctp_association
*asoc
,
3728 __u32 result
, __u32 sn
)
3730 struct sctp_strreset_resp resp
;
3731 __u16 length
= sizeof(resp
);
3732 struct sctp_chunk
*retval
;
3734 retval
= sctp_make_reconf(asoc
, length
);
3738 resp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3739 resp
.param_hdr
.length
= htons(length
);
3740 resp
.response_seq
= htonl(sn
);
3741 resp
.result
= htonl(result
);
3743 sctp_addto_chunk(retval
, sizeof(resp
), &resp
);
3748 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3750 * 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
3751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3752 * | Parameter Type = 16 | Parameter Length |
3753 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3754 * | Re-configuration Response Sequence Number |
3755 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3758 * | Sender's Next TSN (optional) |
3759 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3760 * | Receiver's Next TSN (optional) |
3761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3763 struct sctp_chunk
*sctp_make_strreset_tsnresp(
3764 struct sctp_association
*asoc
,
3765 __u32 result
, __u32 sn
,
3766 __u32 sender_tsn
, __u32 receiver_tsn
)
3768 struct sctp_strreset_resptsn tsnresp
;
3769 __u16 length
= sizeof(tsnresp
);
3770 struct sctp_chunk
*retval
;
3772 retval
= sctp_make_reconf(asoc
, length
);
3776 tsnresp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3777 tsnresp
.param_hdr
.length
= htons(length
);
3779 tsnresp
.response_seq
= htonl(sn
);
3780 tsnresp
.result
= htonl(result
);
3781 tsnresp
.senders_next_tsn
= htonl(sender_tsn
);
3782 tsnresp
.receivers_next_tsn
= htonl(receiver_tsn
);
3784 sctp_addto_chunk(retval
, sizeof(tsnresp
), &tsnresp
);
3789 bool sctp_verify_reconf(const struct sctp_association
*asoc
,
3790 struct sctp_chunk
*chunk
,
3791 struct sctp_paramhdr
**errp
)
3793 struct sctp_reconf_chunk
*hdr
;
3794 union sctp_params param
;
3795 __u16 last
= 0, cnt
= 0;
3797 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
3798 sctp_walk_params(param
, hdr
, params
) {
3799 __u16 length
= ntohs(param
.p
->length
);
3804 switch (param
.p
->type
) {
3805 case SCTP_PARAM_RESET_OUT_REQUEST
:
3806 if (length
< sizeof(struct sctp_strreset_outreq
) ||
3807 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3808 last
!= SCTP_PARAM_RESET_IN_REQUEST
))
3811 case SCTP_PARAM_RESET_IN_REQUEST
:
3812 if (length
< sizeof(struct sctp_strreset_inreq
) ||
3813 (last
&& last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3816 case SCTP_PARAM_RESET_RESPONSE
:
3817 if ((length
!= sizeof(struct sctp_strreset_resp
) &&
3818 length
!= sizeof(struct sctp_strreset_resptsn
)) ||
3819 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3820 last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3823 case SCTP_PARAM_RESET_TSN_REQUEST
:
3825 sizeof(struct sctp_strreset_tsnreq
) || last
)
3828 case SCTP_PARAM_RESET_ADD_IN_STREAMS
:
3829 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3830 (last
&& last
!= SCTP_PARAM_RESET_ADD_OUT_STREAMS
))
3833 case SCTP_PARAM_RESET_ADD_OUT_STREAMS
:
3834 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3835 (last
&& last
!= SCTP_PARAM_RESET_ADD_IN_STREAMS
))
3842 last
= param
.p
->type
;