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(retval
->skb
, hmac_desc
->hmac_len
);
1300 memset(hmac
, 0, hmac_desc
->hmac_len
);
1302 /* Adjust the chunk header to include the empty MAC */
1303 retval
->chunk_hdr
->length
=
1304 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1305 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1311 /********************************************************************
1312 * 2nd Level Abstractions
1313 ********************************************************************/
1315 /* Turn an skb into a chunk.
1316 * FIXME: Eventually move the structure directly inside the skb->cb[].
1318 * sctpimpguide-05.txt Section 2.8.2
1319 * M1) Each time a new DATA chunk is transmitted
1320 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1321 * 'TSN.Missing.Report' count will be used to determine missing chunks
1322 * and when to fast retransmit.
1325 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1326 const struct sctp_association
*asoc
,
1327 struct sock
*sk
, gfp_t gfp
)
1329 struct sctp_chunk
*retval
;
1331 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, gfp
);
1336 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1338 INIT_LIST_HEAD(&retval
->list
);
1340 retval
->asoc
= (struct sctp_association
*)asoc
;
1341 retval
->singleton
= 1;
1343 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1345 /* Polish the bead hole. */
1346 INIT_LIST_HEAD(&retval
->transmitted_list
);
1347 INIT_LIST_HEAD(&retval
->frag_list
);
1348 SCTP_DBG_OBJCNT_INC(chunk
);
1349 atomic_set(&retval
->refcnt
, 1);
1355 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1356 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1357 union sctp_addr
*dest
)
1359 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1360 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1363 /* Extract the source address from a chunk. */
1364 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1366 /* If we have a known transport, use that. */
1367 if (chunk
->transport
) {
1368 return &chunk
->transport
->ipaddr
;
1370 /* Otherwise, extract it from the IP header. */
1371 return &chunk
->source
;
1375 /* Create a new chunk, setting the type and flags headers from the
1376 * arguments, reserving enough space for a 'paylen' byte payload.
1378 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1379 __u8 type
, __u8 flags
, int paylen
,
1382 struct sctp_chunk
*retval
;
1383 sctp_chunkhdr_t
*chunk_hdr
;
1384 struct sk_buff
*skb
;
1387 /* No need to allocate LL here, as this is only a chunk. */
1388 skb
= alloc_skb(SCTP_PAD4(sizeof(sctp_chunkhdr_t
) + paylen
), gfp
);
1392 /* Make room for the chunk header. */
1393 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1394 chunk_hdr
->type
= type
;
1395 chunk_hdr
->flags
= flags
;
1396 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1398 sk
= asoc
? asoc
->base
.sk
: NULL
;
1399 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1405 retval
->chunk_hdr
= chunk_hdr
;
1406 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1408 /* Determine if the chunk needs to be authenticated */
1409 if (sctp_auth_send_cid(type
, asoc
))
1417 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1418 __u8 flags
, int paylen
, gfp_t gfp
)
1420 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1423 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1424 __u8 type
, __u8 flags
, int paylen
,
1427 struct sctp_chunk
*chunk
;
1429 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1431 sctp_control_set_owner_w(chunk
);
1436 /* Release the memory occupied by a chunk. */
1437 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1439 BUG_ON(!list_empty(&chunk
->list
));
1440 list_del_init(&chunk
->transmitted_list
);
1442 consume_skb(chunk
->skb
);
1443 consume_skb(chunk
->auth_chunk
);
1445 SCTP_DBG_OBJCNT_DEC(chunk
);
1446 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1449 /* Possibly, free the chunk. */
1450 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1452 /* Release our reference on the message tracker. */
1454 sctp_datamsg_put(chunk
->msg
);
1456 sctp_chunk_put(chunk
);
1459 /* Grab a reference to the chunk. */
1460 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1462 atomic_inc(&ch
->refcnt
);
1465 /* Release a reference to the chunk. */
1466 void sctp_chunk_put(struct sctp_chunk
*ch
)
1468 if (atomic_dec_and_test(&ch
->refcnt
))
1469 sctp_chunk_destroy(ch
);
1472 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1475 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1479 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1480 int padlen
= SCTP_PAD4(chunklen
) - chunklen
;
1482 padding
= skb_put(chunk
->skb
, padlen
);
1483 target
= skb_put(chunk
->skb
, len
);
1485 memset(padding
, 0, padlen
);
1486 memcpy(target
, data
, len
);
1488 /* Adjust the chunk length field. */
1489 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1490 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1495 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1496 * space in the chunk
1498 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1499 int len
, const void *data
)
1501 if (skb_tailroom(chunk
->skb
) >= len
)
1502 return sctp_addto_chunk(chunk
, len
, data
);
1507 /* Append bytes from user space to the end of a chunk. Will panic if
1508 * chunk is not big enough.
1509 * Returns a kernel err value.
1511 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1512 struct iov_iter
*from
)
1517 /* Make room in chunk for data. */
1518 target
= skb_put(chunk
->skb
, len
);
1520 /* Copy data (whole iovec) into chunk */
1521 copied
= copy_from_iter(target
, len
, from
);
1525 /* Adjust the chunk length field. */
1526 chunk
->chunk_hdr
->length
=
1527 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1528 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1533 /* Helper function to assign a TSN if needed. This assumes that both
1534 * the data_hdr and association have already been assigned.
1536 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1538 struct sctp_datamsg
*msg
;
1539 struct sctp_chunk
*lchunk
;
1540 struct sctp_stream
*stream
;
1547 /* All fragments will be on the same stream */
1548 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1549 stream
= chunk
->asoc
->stream
;
1551 /* Now assign the sequence number to the entire message.
1552 * All fragments must have the same stream sequence number.
1555 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1556 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1559 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1560 ssn
= sctp_ssn_next(stream
, out
, sid
);
1562 ssn
= sctp_ssn_peek(stream
, out
, sid
);
1565 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1566 lchunk
->has_ssn
= 1;
1570 /* Helper function to assign a TSN if needed. This assumes that both
1571 * the data_hdr and association have already been assigned.
1573 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1575 if (!chunk
->has_tsn
) {
1576 /* This is the last possible instant to
1579 chunk
->subh
.data_hdr
->tsn
=
1580 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1585 /* Create a CLOSED association to use with an incoming packet. */
1586 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1587 struct sctp_chunk
*chunk
,
1590 struct sctp_association
*asoc
;
1591 struct sk_buff
*skb
;
1594 /* Create the bare association. */
1595 scope
= sctp_scope(sctp_source(chunk
));
1596 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1601 /* Create an entry for the source address of the packet. */
1602 SCTP_INPUT_CB(skb
)->af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1608 /* Build a cookie representing asoc.
1609 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1611 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1612 const struct sctp_association
*asoc
,
1613 const struct sctp_chunk
*init_chunk
,
1615 const __u8
*raw_addrs
, int addrs_len
)
1617 sctp_cookie_param_t
*retval
;
1618 struct sctp_signed_cookie
*cookie
;
1619 int headersize
, bodysize
;
1621 /* Header size is static data prior to the actual cookie, including
1624 headersize
= sizeof(sctp_paramhdr_t
) +
1625 (sizeof(struct sctp_signed_cookie
) -
1626 sizeof(struct sctp_cookie
));
1627 bodysize
= sizeof(struct sctp_cookie
)
1628 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1630 /* Pad out the cookie to a multiple to make the signature
1631 * functions simpler to write.
1633 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1634 bodysize
+= SCTP_COOKIE_MULTIPLE
1635 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1636 *cookie_len
= headersize
+ bodysize
;
1638 /* Clear this memory since we are sending this data structure
1639 * out on the network.
1641 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1645 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1647 /* Set up the parameter header. */
1648 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1649 retval
->p
.length
= htons(*cookie_len
);
1651 /* Copy the cookie part of the association itself. */
1652 cookie
->c
= asoc
->c
;
1653 /* Save the raw address list length in the cookie. */
1654 cookie
->c
.raw_addr_list_len
= addrs_len
;
1656 /* Remember PR-SCTP capability. */
1657 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1659 /* Save adaptation indication in the cookie. */
1660 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1662 /* Set an expiration time for the cookie. */
1663 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1666 /* Copy the peer's init packet. */
1667 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1668 ntohs(init_chunk
->chunk_hdr
->length
));
1670 /* Copy the raw local address list of the association. */
1671 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1672 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1674 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1675 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1678 /* Sign the message. */
1679 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1682 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1683 sizeof(ep
->secret_key
)) ?:
1684 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1686 shash_desc_zero(desc
);
1700 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1701 struct sctp_association
*sctp_unpack_cookie(
1702 const struct sctp_endpoint
*ep
,
1703 const struct sctp_association
*asoc
,
1704 struct sctp_chunk
*chunk
, gfp_t gfp
,
1705 int *error
, struct sctp_chunk
**errp
)
1707 struct sctp_association
*retval
= NULL
;
1708 struct sctp_signed_cookie
*cookie
;
1709 struct sctp_cookie
*bear_cookie
;
1710 int headersize
, bodysize
, fixed_size
;
1711 __u8
*digest
= ep
->digest
;
1714 struct sk_buff
*skb
= chunk
->skb
;
1717 /* Header size is static data prior to the actual cookie, including
1720 headersize
= sizeof(sctp_chunkhdr_t
) +
1721 (sizeof(struct sctp_signed_cookie
) -
1722 sizeof(struct sctp_cookie
));
1723 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1724 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1726 /* Verify that the chunk looks like it even has a cookie.
1727 * There must be enough room for our cookie and our peer's
1730 len
= ntohs(chunk
->chunk_hdr
->length
);
1731 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1734 /* Verify that the cookie has been padded out. */
1735 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1738 /* Process the cookie. */
1739 cookie
= chunk
->subh
.cookie_hdr
;
1740 bear_cookie
= &cookie
->c
;
1742 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1745 /* Check the signature. */
1747 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1750 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1753 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1754 sizeof(ep
->secret_key
)) ?:
1755 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1757 shash_desc_zero(desc
);
1760 *error
= -SCTP_IERROR_NOMEM
;
1765 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1766 *error
= -SCTP_IERROR_BAD_SIG
;
1771 /* IG Section 2.35.2:
1772 * 3) Compare the port numbers and the verification tag contained
1773 * within the COOKIE ECHO chunk to the actual port numbers and the
1774 * verification tag within the SCTP common header of the received
1775 * packet. If these values do not match the packet MUST be silently
1778 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1779 *error
= -SCTP_IERROR_BAD_TAG
;
1783 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1784 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1785 *error
= -SCTP_IERROR_BAD_PORTS
;
1789 /* Check to see if the cookie is stale. If there is already
1790 * an association, there is no need to check cookie's expiration
1791 * for init collision case of lost COOKIE ACK.
1792 * If skb has been timestamped, then use the stamp, otherwise
1793 * use current time. This introduces a small possibility that
1794 * that a cookie may be considered expired, but his would only slow
1795 * down the new association establishment instead of every packet.
1797 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1798 kt
= skb_get_ktime(skb
);
1800 kt
= ktime_get_real();
1802 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1804 * Section 3.3.10.3 Stale Cookie Error (3)
1808 * Stale Cookie Error: Indicates the receipt of a valid State
1809 * Cookie that has expired.
1811 len
= ntohs(chunk
->chunk_hdr
->length
);
1812 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1814 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1815 __be32 n
= htonl(usecs
);
1817 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1819 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1820 *error
= -SCTP_IERROR_STALE_COOKIE
;
1822 *error
= -SCTP_IERROR_NOMEM
;
1827 /* Make a new base association. */
1828 scope
= sctp_scope(sctp_source(chunk
));
1829 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1831 *error
= -SCTP_IERROR_NOMEM
;
1835 /* Set up our peer's port number. */
1836 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1838 /* Populate the association from the cookie. */
1839 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1841 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1843 *error
= -SCTP_IERROR_NOMEM
;
1847 /* Also, add the destination address. */
1848 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1849 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1850 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1854 retval
->next_tsn
= retval
->c
.initial_tsn
;
1855 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1856 retval
->addip_serial
= retval
->c
.initial_tsn
;
1857 retval
->strreset_outseq
= retval
->c
.initial_tsn
;
1858 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1859 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1860 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1862 /* The INIT stuff will be done by the side effects. */
1867 sctp_association_free(retval
);
1872 /* Yikes! The packet is either corrupt or deliberately
1875 *error
= -SCTP_IERROR_MALFORMED
;
1879 /********************************************************************
1880 * 3rd Level Abstractions
1881 ********************************************************************/
1883 struct __sctp_missing
{
1889 * Report a missing mandatory parameter.
1891 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1892 sctp_param_t paramtype
,
1893 struct sctp_chunk
*chunk
,
1894 struct sctp_chunk
**errp
)
1896 struct __sctp_missing report
;
1899 len
= SCTP_PAD4(sizeof(report
));
1901 /* Make an ERROR chunk, preparing enough room for
1902 * returning multiple unknown parameters.
1905 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1908 report
.num_missing
= htonl(1);
1909 report
.type
= paramtype
;
1910 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1912 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1915 /* Stop processing this chunk. */
1919 /* Report an Invalid Mandatory Parameter. */
1920 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1921 struct sctp_chunk
*chunk
,
1922 struct sctp_chunk
**errp
)
1924 /* Invalid Mandatory Parameter Error has no payload. */
1927 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1930 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1932 /* Stop processing this chunk. */
1936 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1937 struct sctp_paramhdr
*param
,
1938 const struct sctp_chunk
*chunk
,
1939 struct sctp_chunk
**errp
)
1941 /* This is a fatal error. Any accumulated non-fatal errors are
1945 sctp_chunk_free(*errp
);
1947 /* Create an error chunk and fill it in with our payload. */
1948 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1954 /* Do not attempt to handle the HOST_NAME parm. However, do
1955 * send back an indicator to the peer.
1957 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1958 union sctp_params param
,
1959 struct sctp_chunk
*chunk
,
1960 struct sctp_chunk
**errp
)
1962 __u16 len
= ntohs(param
.p
->length
);
1964 /* Processing of the HOST_NAME parameter will generate an
1965 * ABORT. If we've accumulated any non-fatal errors, they
1966 * would be unrecognized parameters and we should not include
1967 * them in the ABORT.
1970 sctp_chunk_free(*errp
);
1972 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1975 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1976 sctp_addto_chunk(*errp
, len
, param
.v
);
1979 /* Stop processing this chunk. */
1983 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
1985 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
1987 int have_asconf
= 0;
1990 for (i
= 0; i
< num_ext
; i
++) {
1991 switch (param
.ext
->chunks
[i
]) {
1995 case SCTP_CID_ASCONF
:
1996 case SCTP_CID_ASCONF_ACK
:
2002 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2003 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2004 * only if ADD-IP is turned on and we are not backward-compatible
2007 if (net
->sctp
.addip_noauth
)
2010 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
2016 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2017 union sctp_params param
)
2019 struct net
*net
= sock_net(asoc
->base
.sk
);
2020 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2023 for (i
= 0; i
< num_ext
; i
++) {
2024 switch (param
.ext
->chunks
[i
]) {
2025 case SCTP_CID_RECONF
:
2026 if (asoc
->reconf_enable
&&
2027 !asoc
->peer
.reconf_capable
)
2028 asoc
->peer
.reconf_capable
= 1;
2030 case SCTP_CID_FWD_TSN
:
2031 if (asoc
->prsctp_enable
&& !asoc
->peer
.prsctp_capable
)
2032 asoc
->peer
.prsctp_capable
= 1;
2035 /* if the peer reports AUTH, assume that he
2038 if (asoc
->ep
->auth_enable
)
2039 asoc
->peer
.auth_capable
= 1;
2041 case SCTP_CID_ASCONF
:
2042 case SCTP_CID_ASCONF_ACK
:
2043 if (net
->sctp
.addip_enable
)
2044 asoc
->peer
.asconf_capable
= 1;
2052 /* RFC 3.2.1 & the Implementers Guide 2.2.
2054 * The Parameter Types are encoded such that the
2055 * highest-order two bits specify the action that must be
2056 * taken if the processing endpoint does not recognize the
2059 * 00 - Stop processing this parameter; do not process any further
2060 * parameters within this chunk
2062 * 01 - Stop processing this parameter, do not process any further
2063 * parameters within this chunk, and report the unrecognized
2064 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2066 * 10 - Skip this parameter and continue processing.
2068 * 11 - Skip this parameter and continue processing but
2069 * report the unrecognized parameter in an
2070 * 'Unrecognized Parameter' ERROR chunk.
2073 * SCTP_IERROR_NO_ERROR - continue with the chunk
2074 * SCTP_IERROR_ERROR - stop and report an error.
2075 * SCTP_IERROR_NOMEME - out of memory.
2077 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2078 union sctp_params param
,
2079 struct sctp_chunk
*chunk
,
2080 struct sctp_chunk
**errp
)
2082 int retval
= SCTP_IERROR_NO_ERROR
;
2084 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2085 case SCTP_PARAM_ACTION_DISCARD
:
2086 retval
= SCTP_IERROR_ERROR
;
2088 case SCTP_PARAM_ACTION_SKIP
:
2090 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2091 retval
= SCTP_IERROR_ERROR
;
2093 case SCTP_PARAM_ACTION_SKIP_ERR
:
2094 /* Make an ERROR chunk, preparing enough room for
2095 * returning multiple unknown parameters.
2098 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2101 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2102 SCTP_PAD4(ntohs(param
.p
->length
))))
2103 sctp_addto_chunk_fixed(*errp
,
2104 SCTP_PAD4(ntohs(param
.p
->length
)),
2107 /* If there is no memory for generating the ERROR
2108 * report as specified, an ABORT will be triggered
2109 * to the peer and the association won't be
2112 retval
= SCTP_IERROR_NOMEM
;
2122 /* Verify variable length parameters
2124 * SCTP_IERROR_ABORT - trigger an ABORT
2125 * SCTP_IERROR_NOMEM - out of memory (abort)
2126 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2127 * SCTP_IERROR_NO_ERROR - continue with the chunk
2129 static sctp_ierror_t
sctp_verify_param(struct net
*net
,
2130 const struct sctp_endpoint
*ep
,
2131 const struct sctp_association
*asoc
,
2132 union sctp_params param
,
2134 struct sctp_chunk
*chunk
,
2135 struct sctp_chunk
**err_chunk
)
2137 struct sctp_hmac_algo_param
*hmacs
;
2138 int retval
= SCTP_IERROR_NO_ERROR
;
2139 __u16 n_elt
, id
= 0;
2142 /* FIXME - This routine is not looking at each parameter per the
2143 * chunk type, i.e., unrecognized parameters should be further
2144 * identified based on the chunk id.
2147 switch (param
.p
->type
) {
2148 case SCTP_PARAM_IPV4_ADDRESS
:
2149 case SCTP_PARAM_IPV6_ADDRESS
:
2150 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2151 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2152 case SCTP_PARAM_STATE_COOKIE
:
2153 case SCTP_PARAM_HEARTBEAT_INFO
:
2154 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2155 case SCTP_PARAM_ECN_CAPABLE
:
2156 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2159 case SCTP_PARAM_SUPPORTED_EXT
:
2160 if (!sctp_verify_ext_param(net
, param
))
2161 return SCTP_IERROR_ABORT
;
2164 case SCTP_PARAM_SET_PRIMARY
:
2165 if (net
->sctp
.addip_enable
)
2169 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2170 /* Tell the peer, we won't support this param. */
2171 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2172 retval
= SCTP_IERROR_ABORT
;
2175 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2176 if (ep
->prsctp_enable
)
2180 case SCTP_PARAM_RANDOM
:
2181 if (!ep
->auth_enable
)
2184 /* SCTP-AUTH: Secion 6.1
2185 * If the random number is not 32 byte long the association
2186 * MUST be aborted. The ABORT chunk SHOULD contain the error
2187 * cause 'Protocol Violation'.
2189 if (SCTP_AUTH_RANDOM_LENGTH
!=
2190 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2191 sctp_process_inv_paramlength(asoc
, param
.p
,
2193 retval
= SCTP_IERROR_ABORT
;
2197 case SCTP_PARAM_CHUNKS
:
2198 if (!ep
->auth_enable
)
2201 /* SCTP-AUTH: Section 3.2
2202 * The CHUNKS parameter MUST be included once in the INIT or
2203 * INIT-ACK chunk if the sender wants to receive authenticated
2204 * chunks. Its maximum length is 260 bytes.
2206 if (260 < ntohs(param
.p
->length
)) {
2207 sctp_process_inv_paramlength(asoc
, param
.p
,
2209 retval
= SCTP_IERROR_ABORT
;
2213 case SCTP_PARAM_HMAC_ALGO
:
2214 if (!ep
->auth_enable
)
2217 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2218 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2220 /* SCTP-AUTH: Section 6.1
2221 * The HMAC algorithm based on SHA-1 MUST be supported and
2222 * included in the HMAC-ALGO parameter.
2224 for (i
= 0; i
< n_elt
; i
++) {
2225 id
= ntohs(hmacs
->hmac_ids
[i
]);
2227 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2231 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2232 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2234 retval
= SCTP_IERROR_ABORT
;
2239 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2240 __func__
, ntohs(param
.p
->type
), cid
);
2242 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2248 /* Verify the INIT packet before we process it. */
2249 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2250 const struct sctp_association
*asoc
, sctp_cid_t cid
,
2251 sctp_init_chunk_t
*peer_init
, struct sctp_chunk
*chunk
,
2252 struct sctp_chunk
**errp
)
2254 union sctp_params param
;
2255 bool has_cookie
= false;
2258 /* Check for missing mandatory parameters. Note: Initial TSN is
2259 * also mandatory, but is not checked here since the valid range
2260 * is 0..2**32-1. RFC4960, section 3.3.3.
2262 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2263 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2264 peer_init
->init_hdr
.init_tag
== 0 ||
2265 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2266 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2268 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2269 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2273 /* There is a possibility that a parameter length was bad and
2274 * in that case we would have stoped walking the parameters.
2275 * The current param.p would point at the bad one.
2276 * Current consensus on the mailing list is to generate a PROTOCOL
2277 * VIOLATION error. We build the ERROR chunk here and let the normal
2278 * error handling code build and send the packet.
2280 if (param
.v
!= (void *)chunk
->chunk_end
)
2281 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2283 /* The only missing mandatory param possible today is
2284 * the state cookie for an INIT-ACK chunk.
2286 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2287 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2290 /* Verify all the variable length parameters */
2291 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2292 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2295 case SCTP_IERROR_ABORT
:
2296 case SCTP_IERROR_NOMEM
:
2298 case SCTP_IERROR_ERROR
:
2300 case SCTP_IERROR_NO_ERROR
:
2305 } /* for (loop through all parameters) */
2310 /* Unpack the parameters in an INIT packet into an association.
2311 * Returns 0 on failure, else success.
2312 * FIXME: This is an association method.
2314 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2315 const union sctp_addr
*peer_addr
,
2316 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2318 struct net
*net
= sock_net(asoc
->base
.sk
);
2319 union sctp_params param
;
2320 struct sctp_transport
*transport
;
2321 struct list_head
*pos
, *temp
;
2323 union sctp_addr addr
;
2327 /* We must include the address that the INIT packet came from.
2328 * This is the only address that matters for an INIT packet.
2329 * When processing a COOKIE ECHO, we retrieve the from address
2330 * of the INIT from the cookie.
2333 /* This implementation defaults to making the first transport
2334 * added as the primary transport. The source address seems to
2335 * be a a better choice than any of the embedded addresses.
2337 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2340 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2343 /* Process the initialization parameters. */
2344 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2345 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2346 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2347 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2348 af
->from_addr_param(&addr
, param
.addr
,
2349 chunk
->sctp_hdr
->source
, 0);
2350 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2354 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2358 /* source address of chunk may not match any valid address */
2362 /* AUTH: After processing the parameters, make sure that we
2363 * have all the required info to potentially do authentications.
2365 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2366 !asoc
->peer
.peer_hmacs
))
2367 asoc
->peer
.auth_capable
= 0;
2369 /* In a non-backward compatible mode, if the peer claims
2370 * support for ADD-IP but not AUTH, the ADD-IP spec states
2371 * that we MUST ABORT the association. Section 6. The section
2372 * also give us an option to silently ignore the packet, which
2373 * is what we'll do here.
2375 if (!net
->sctp
.addip_noauth
&&
2376 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2377 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2379 SCTP_PARAM_SET_PRIMARY
);
2380 asoc
->peer
.asconf_capable
= 0;
2384 /* Walk list of transports, removing transports in the UNKNOWN state. */
2385 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2386 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2387 if (transport
->state
== SCTP_UNKNOWN
) {
2388 sctp_assoc_rm_peer(asoc
, transport
);
2392 /* The fixed INIT headers are always in network byte
2395 asoc
->peer
.i
.init_tag
=
2396 ntohl(peer_init
->init_hdr
.init_tag
);
2397 asoc
->peer
.i
.a_rwnd
=
2398 ntohl(peer_init
->init_hdr
.a_rwnd
);
2399 asoc
->peer
.i
.num_outbound_streams
=
2400 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2401 asoc
->peer
.i
.num_inbound_streams
=
2402 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2403 asoc
->peer
.i
.initial_tsn
=
2404 ntohl(peer_init
->init_hdr
.initial_tsn
);
2406 asoc
->strreset_inseq
= asoc
->peer
.i
.initial_tsn
;
2408 /* Apply the upper bounds for output streams based on peer's
2409 * number of inbound streams.
2411 if (asoc
->c
.sinit_num_ostreams
>
2412 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2413 asoc
->c
.sinit_num_ostreams
=
2414 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2417 if (asoc
->c
.sinit_max_instreams
>
2418 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2419 asoc
->c
.sinit_max_instreams
=
2420 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2423 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2424 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2426 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2427 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2429 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2430 cookie
= asoc
->peer
.cookie
;
2432 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2433 if (!asoc
->peer
.cookie
)
2437 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2438 * high (for example, implementations MAY use the size of the receiver
2439 * advertised window).
2441 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2443 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2446 /* Set up the TSN tracking pieces. */
2447 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2448 asoc
->peer
.i
.initial_tsn
, gfp
))
2451 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2453 * The stream sequence number in all the streams shall start
2454 * from 0 when the association is established. Also, when the
2455 * stream sequence number reaches the value 65535 the next
2456 * stream sequence number shall be set to 0.
2459 /* Allocate storage for the negotiated streams if it is not a temporary
2465 asoc
->stream
= sctp_stream_new(asoc
->c
.sinit_max_instreams
,
2466 asoc
->c
.sinit_num_ostreams
, gfp
);
2470 error
= sctp_assoc_set_id(asoc
, gfp
);
2475 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2477 * When an endpoint has an ASCONF signaled change to be sent to the
2478 * remote endpoint it should do the following:
2480 * A2) A serial number should be assigned to the Chunk. The serial
2481 * number should be a monotonically increasing number. All serial
2482 * numbers are defined to be initialized at the start of the
2483 * association to the same value as the Initial TSN.
2485 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2489 /* Release the transport structures. */
2490 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2491 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2492 if (transport
->state
!= SCTP_ACTIVE
)
2493 sctp_assoc_rm_peer(asoc
, transport
);
2501 /* Update asoc with the option described in param.
2503 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2505 * asoc is the association to update.
2506 * param is the variable length parameter to use for update.
2507 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2508 * If the current packet is an INIT we want to minimize the amount of
2509 * work we do. In particular, we should not build transport
2510 * structures for the addresses.
2512 static int sctp_process_param(struct sctp_association
*asoc
,
2513 union sctp_params param
,
2514 const union sctp_addr
*peer_addr
,
2517 struct net
*net
= sock_net(asoc
->base
.sk
);
2518 union sctp_addr addr
;
2525 union sctp_addr_param
*addr_param
;
2526 struct sctp_transport
*t
;
2527 struct sctp_endpoint
*ep
= asoc
->ep
;
2529 /* We maintain all INIT parameters in network byte order all the
2530 * time. This allows us to not worry about whether the parameters
2531 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2533 switch (param
.p
->type
) {
2534 case SCTP_PARAM_IPV6_ADDRESS
:
2535 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2539 case SCTP_PARAM_IPV4_ADDRESS
:
2540 /* v4 addresses are not allowed on v6-only socket */
2541 if (ipv6_only_sock(asoc
->base
.sk
))
2544 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2545 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2546 scope
= sctp_scope(peer_addr
);
2547 if (sctp_in_scope(net
, &addr
, scope
))
2548 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2552 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2553 if (!net
->sctp
.cookie_preserve_enable
)
2556 stale
= ntohl(param
.life
->lifespan_increment
);
2558 /* Suggested Cookie Life span increment's unit is msec,
2561 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2564 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2565 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2568 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2569 /* Turn off the default values first so we'll know which
2570 * ones are really set by the peer.
2572 asoc
->peer
.ipv4_address
= 0;
2573 asoc
->peer
.ipv6_address
= 0;
2575 /* Assume that peer supports the address family
2576 * by which it sends a packet.
2578 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2579 asoc
->peer
.ipv6_address
= 1;
2580 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2581 asoc
->peer
.ipv4_address
= 1;
2583 /* Cycle through address types; avoid divide by 0. */
2584 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2586 sat
/= sizeof(__u16
);
2588 for (i
= 0; i
< sat
; ++i
) {
2589 switch (param
.sat
->types
[i
]) {
2590 case SCTP_PARAM_IPV4_ADDRESS
:
2591 asoc
->peer
.ipv4_address
= 1;
2594 case SCTP_PARAM_IPV6_ADDRESS
:
2595 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2596 asoc
->peer
.ipv6_address
= 1;
2599 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2600 asoc
->peer
.hostname_address
= 1;
2603 default: /* Just ignore anything else. */
2609 case SCTP_PARAM_STATE_COOKIE
:
2610 asoc
->peer
.cookie_len
=
2611 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2612 asoc
->peer
.cookie
= param
.cookie
->body
;
2615 case SCTP_PARAM_HEARTBEAT_INFO
:
2616 /* Would be odd to receive, but it causes no problems. */
2619 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2620 /* Rejected during verify stage. */
2623 case SCTP_PARAM_ECN_CAPABLE
:
2624 asoc
->peer
.ecn_capable
= 1;
2627 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2628 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2631 case SCTP_PARAM_SET_PRIMARY
:
2632 if (!net
->sctp
.addip_enable
)
2635 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2637 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2641 af
->from_addr_param(&addr
, addr_param
,
2642 htons(asoc
->peer
.port
), 0);
2644 /* if the address is invalid, we can't process it.
2645 * XXX: see spec for what to do.
2647 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2650 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2654 sctp_assoc_set_primary(asoc
, t
);
2657 case SCTP_PARAM_SUPPORTED_EXT
:
2658 sctp_process_ext_param(asoc
, param
);
2661 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2662 if (asoc
->prsctp_enable
) {
2663 asoc
->peer
.prsctp_capable
= 1;
2669 case SCTP_PARAM_RANDOM
:
2670 if (!ep
->auth_enable
)
2673 /* Save peer's random parameter */
2674 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2675 ntohs(param
.p
->length
), gfp
);
2676 if (!asoc
->peer
.peer_random
) {
2682 case SCTP_PARAM_HMAC_ALGO
:
2683 if (!ep
->auth_enable
)
2686 /* Save peer's HMAC list */
2687 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2688 ntohs(param
.p
->length
), gfp
);
2689 if (!asoc
->peer
.peer_hmacs
) {
2694 /* Set the default HMAC the peer requested*/
2695 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2698 case SCTP_PARAM_CHUNKS
:
2699 if (!ep
->auth_enable
)
2702 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2703 ntohs(param
.p
->length
), gfp
);
2704 if (!asoc
->peer
.peer_chunks
)
2709 /* Any unrecognized parameters should have been caught
2710 * and handled by sctp_verify_param() which should be
2711 * called prior to this routine. Simply log the error
2714 pr_debug("%s: ignoring param:%d for association:%p.\n",
2715 __func__
, ntohs(param
.p
->type
), asoc
);
2722 /* Select a new verification tag. */
2723 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2725 /* I believe that this random number generator complies with RFC1750.
2726 * A tag of 0 is reserved for special cases (e.g. INIT).
2731 get_random_bytes(&x
, sizeof(__u32
));
2737 /* Select an initial TSN to send during startup. */
2738 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2742 get_random_bytes(&retval
, sizeof(__u32
));
2747 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2749 * 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
2750 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2751 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2752 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2754 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2755 * | Address Parameter |
2756 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2757 * | ASCONF Parameter #1 |
2758 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2762 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2763 * | ASCONF Parameter #N |
2764 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2766 * Address Parameter and other parameter will not be wrapped in this function
2768 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2769 union sctp_addr
*addr
,
2772 sctp_addiphdr_t asconf
;
2773 struct sctp_chunk
*retval
;
2774 int length
= sizeof(asconf
) + vparam_len
;
2775 union sctp_addr_param addrparam
;
2777 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2779 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2784 /* Create the chunk. */
2785 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2790 asconf
.serial
= htonl(asoc
->addip_serial
++);
2792 retval
->subh
.addip_hdr
=
2793 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2794 retval
->param_hdr
.v
=
2795 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2801 * 3.2.1 Add IP Address
2803 * 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
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 * | Type = 0xC001 | Length = Variable |
2806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 * | ASCONF-Request Correlation ID |
2808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2809 * | Address Parameter |
2810 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2812 * 3.2.2 Delete IP Address
2814 * 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
2815 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2816 * | Type = 0xC002 | Length = Variable |
2817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2818 * | ASCONF-Request Correlation ID |
2819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2820 * | Address Parameter |
2821 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2824 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2825 union sctp_addr
*laddr
,
2826 struct sockaddr
*addrs
,
2830 sctp_addip_param_t param
;
2831 struct sctp_chunk
*retval
;
2832 union sctp_addr_param addr_param
;
2833 union sctp_addr
*addr
;
2836 int paramlen
= sizeof(param
);
2837 int addr_param_len
= 0;
2842 /* Get total length of all the address parameters. */
2844 for (i
= 0; i
< addrcnt
; i
++) {
2846 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2847 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2849 totallen
+= paramlen
;
2850 totallen
+= addr_param_len
;
2852 addr_buf
+= af
->sockaddr_len
;
2853 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2854 /* reuse the parameter length from the same scope one */
2855 totallen
+= paramlen
;
2856 totallen
+= addr_param_len
;
2859 pr_debug("%s: picked same-scope del_pending addr, "
2860 "totallen for all addresses is %d\n",
2861 __func__
, totallen
);
2865 /* Create an asconf chunk with the required length. */
2866 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2870 /* Add the address parameters to the asconf chunk. */
2872 for (i
= 0; i
< addrcnt
; i
++) {
2874 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2875 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2876 param
.param_hdr
.type
= flags
;
2877 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2880 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2881 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2883 addr_buf
+= af
->sockaddr_len
;
2885 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2886 addr
= asoc
->asconf_addr_del_pending
;
2887 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2888 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2889 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2890 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2893 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2894 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2900 * 3.2.4 Set Primary IP Address
2902 * 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
2903 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2904 * | Type =0xC004 | Length = Variable |
2905 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2906 * | ASCONF-Request Correlation ID |
2907 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2908 * | Address Parameter |
2909 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2911 * Create an ASCONF chunk with Set Primary IP address parameter.
2913 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2914 union sctp_addr
*addr
)
2916 sctp_addip_param_t param
;
2917 struct sctp_chunk
*retval
;
2918 int len
= sizeof(param
);
2919 union sctp_addr_param addrparam
;
2921 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2923 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2928 /* Create the chunk and make asconf header. */
2929 retval
= sctp_make_asconf(asoc
, addr
, len
);
2933 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2934 param
.param_hdr
.length
= htons(len
);
2937 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2938 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2943 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2945 * 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
2946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2947 * | Type = 0x80 | Chunk Flags | Chunk Length |
2948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2951 * | ASCONF Parameter Response#1 |
2952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2956 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2957 * | ASCONF Parameter Response#N |
2958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2960 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2962 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2963 __u32 serial
, int vparam_len
)
2965 sctp_addiphdr_t asconf
;
2966 struct sctp_chunk
*retval
;
2967 int length
= sizeof(asconf
) + vparam_len
;
2969 /* Create the chunk. */
2970 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2975 asconf
.serial
= htonl(serial
);
2977 retval
->subh
.addip_hdr
=
2978 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2983 /* Add response parameters to an ASCONF_ACK chunk. */
2984 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2985 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2987 sctp_addip_param_t ack_param
;
2988 sctp_errhdr_t err_param
;
2989 int asconf_param_len
= 0;
2990 int err_param_len
= 0;
2991 __be16 response_type
;
2993 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2994 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2996 response_type
= SCTP_PARAM_ERR_CAUSE
;
2997 err_param_len
= sizeof(err_param
);
3000 ntohs(asconf_param
->param_hdr
.length
);
3003 /* Add Success Indication or Error Cause Indication parameter. */
3004 ack_param
.param_hdr
.type
= response_type
;
3005 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
3008 ack_param
.crr_id
= crr_id
;
3009 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
3011 if (SCTP_ERROR_NO_ERROR
== err_code
)
3014 /* Add Error Cause parameter. */
3015 err_param
.cause
= err_code
;
3016 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
3017 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
3019 /* Add the failed TLV copied from ASCONF chunk. */
3021 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3024 /* Process a asconf parameter. */
3025 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3026 struct sctp_chunk
*asconf
,
3027 sctp_addip_param_t
*asconf_param
)
3029 struct sctp_transport
*peer
;
3031 union sctp_addr addr
;
3032 union sctp_addr_param
*addr_param
;
3034 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3036 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3037 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3038 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3039 return SCTP_ERROR_UNKNOWN_PARAM
;
3041 switch (addr_param
->p
.type
) {
3042 case SCTP_PARAM_IPV6_ADDRESS
:
3043 if (!asoc
->peer
.ipv6_address
)
3044 return SCTP_ERROR_DNS_FAILED
;
3046 case SCTP_PARAM_IPV4_ADDRESS
:
3047 if (!asoc
->peer
.ipv4_address
)
3048 return SCTP_ERROR_DNS_FAILED
;
3051 return SCTP_ERROR_DNS_FAILED
;
3054 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3056 return SCTP_ERROR_DNS_FAILED
;
3058 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3060 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3061 * or multicast address.
3062 * (note: wildcard is permitted and requires special handling so
3063 * make sure we check for that)
3065 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3066 return SCTP_ERROR_DNS_FAILED
;
3068 switch (asconf_param
->param_hdr
.type
) {
3069 case SCTP_PARAM_ADD_IP
:
3071 * If the address 0.0.0.0 or ::0 is provided, the source
3072 * address of the packet MUST be added.
3074 if (af
->is_any(&addr
))
3075 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3077 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3078 * request and does not have the local resources to add this
3079 * new address to the association, it MUST return an Error
3080 * Cause TLV set to the new error code 'Operation Refused
3081 * Due to Resource Shortage'.
3084 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3086 return SCTP_ERROR_RSRC_LOW
;
3088 /* Start the heartbeat timer. */
3089 sctp_transport_reset_hb_timer(peer
);
3090 asoc
->new_transport
= peer
;
3092 case SCTP_PARAM_DEL_IP
:
3093 /* ADDIP 4.3 D7) If a request is received to delete the
3094 * last remaining IP address of a peer endpoint, the receiver
3095 * MUST send an Error Cause TLV with the error cause set to the
3096 * new error code 'Request to Delete Last Remaining IP Address'.
3098 if (asoc
->peer
.transport_count
== 1)
3099 return SCTP_ERROR_DEL_LAST_IP
;
3101 /* ADDIP 4.3 D8) If a request is received to delete an IP
3102 * address which is also the source address of the IP packet
3103 * which contained the ASCONF chunk, the receiver MUST reject
3104 * this request. To reject the request the receiver MUST send
3105 * an Error Cause TLV set to the new error code 'Request to
3106 * Delete Source IP Address'
3108 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3109 return SCTP_ERROR_DEL_SRC_IP
;
3112 * If the address 0.0.0.0 or ::0 is provided, all
3113 * addresses of the peer except the source address of the
3114 * packet MUST be deleted.
3116 if (af
->is_any(&addr
)) {
3117 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3118 sctp_assoc_del_nonprimary_peers(asoc
,
3120 return SCTP_ERROR_NO_ERROR
;
3123 /* If the address is not part of the association, the
3124 * ASCONF-ACK with Error Cause Indication Parameter
3125 * which including cause of Unresolvable Address should
3128 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3130 return SCTP_ERROR_DNS_FAILED
;
3132 sctp_assoc_rm_peer(asoc
, peer
);
3134 case SCTP_PARAM_SET_PRIMARY
:
3135 /* ADDIP Section 4.2.4
3136 * If the address 0.0.0.0 or ::0 is provided, the receiver
3137 * MAY mark the source address of the packet as its
3140 if (af
->is_any(&addr
))
3141 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3143 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3145 return SCTP_ERROR_DNS_FAILED
;
3147 sctp_assoc_set_primary(asoc
, peer
);
3151 return SCTP_ERROR_NO_ERROR
;
3154 /* Verify the ASCONF packet before we process it. */
3155 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3156 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3157 struct sctp_paramhdr
**errp
)
3159 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) chunk
->chunk_hdr
;
3160 union sctp_params param
;
3161 bool addr_param_seen
= false;
3163 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3164 size_t length
= ntohs(param
.p
->length
);
3167 switch (param
.p
->type
) {
3168 case SCTP_PARAM_ERR_CAUSE
:
3170 case SCTP_PARAM_IPV4_ADDRESS
:
3171 if (length
!= sizeof(sctp_ipv4addr_param_t
))
3173 /* ensure there is only one addr param and it's in the
3174 * beginning of addip_hdr params, or we reject it.
3176 if (param
.v
!= addip
->addip_hdr
.params
)
3178 addr_param_seen
= true;
3180 case SCTP_PARAM_IPV6_ADDRESS
:
3181 if (length
!= sizeof(sctp_ipv6addr_param_t
))
3183 if (param
.v
!= addip
->addip_hdr
.params
)
3185 addr_param_seen
= true;
3187 case SCTP_PARAM_ADD_IP
:
3188 case SCTP_PARAM_DEL_IP
:
3189 case SCTP_PARAM_SET_PRIMARY
:
3190 /* In ASCONF chunks, these need to be first. */
3191 if (addr_param_needed
&& !addr_param_seen
)
3193 length
= ntohs(param
.addip
->param_hdr
.length
);
3194 if (length
< sizeof(sctp_addip_param_t
) +
3195 sizeof(sctp_paramhdr_t
))
3198 case SCTP_PARAM_SUCCESS_REPORT
:
3199 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3200 if (length
!= sizeof(sctp_addip_param_t
))
3204 /* This is unkown to us, reject! */
3209 /* Remaining sanity checks. */
3210 if (addr_param_needed
&& !addr_param_seen
)
3212 if (!addr_param_needed
&& addr_param_seen
)
3214 if (param
.v
!= chunk
->chunk_end
)
3220 /* Process an incoming ASCONF chunk with the next expected serial no. and
3221 * return an ASCONF_ACK chunk to be sent in response.
3223 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3224 struct sctp_chunk
*asconf
)
3226 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) asconf
->chunk_hdr
;
3227 bool all_param_pass
= true;
3228 union sctp_params param
;
3229 sctp_addiphdr_t
*hdr
;
3230 union sctp_addr_param
*addr_param
;
3231 struct sctp_chunk
*asconf_ack
;
3237 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3238 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3239 serial
= ntohl(hdr
->serial
);
3241 /* Skip the addiphdr and store a pointer to address parameter. */
3242 length
= sizeof(sctp_addiphdr_t
);
3243 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3244 chunk_len
-= length
;
3246 /* Skip the address parameter and store a pointer to the first
3249 length
= ntohs(addr_param
->p
.length
);
3250 chunk_len
-= length
;
3252 /* create an ASCONF_ACK chunk.
3253 * Based on the definitions of parameters, we know that the size of
3254 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3257 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3261 /* Process the TLVs contained within the ASCONF chunk. */
3262 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3263 /* Skip preceeding address parameters. */
3264 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3265 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3268 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3271 * If an error response is received for a TLV parameter,
3272 * all TLVs with no response before the failed TLV are
3273 * considered successful if not reported. All TLVs after
3274 * the failed response are considered unsuccessful unless
3275 * a specific success indication is present for the parameter.
3277 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3278 all_param_pass
= false;
3279 if (!all_param_pass
)
3280 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3281 err_code
, param
.addip
);
3283 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3284 * an IP address sends an 'Out of Resource' in its response, it
3285 * MUST also fail any subsequent add or delete requests bundled
3288 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3292 asoc
->peer
.addip_serial
++;
3294 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3295 * after freeing the reference to old asconf ack if any.
3298 sctp_chunk_hold(asconf_ack
);
3299 list_add_tail(&asconf_ack
->transmitted_list
,
3300 &asoc
->asconf_ack_list
);
3306 /* Process a asconf parameter that is successfully acked. */
3307 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3308 sctp_addip_param_t
*asconf_param
)
3311 union sctp_addr addr
;
3312 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3313 union sctp_addr_param
*addr_param
;
3314 struct sctp_transport
*transport
;
3315 struct sctp_sockaddr_entry
*saddr
;
3317 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3319 /* We have checked the packet before, so we do not check again. */
3320 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3321 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3323 switch (asconf_param
->param_hdr
.type
) {
3324 case SCTP_PARAM_ADD_IP
:
3325 /* This is always done in BH context with a socket lock
3326 * held, so the list can not change.
3329 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3330 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3331 saddr
->state
= SCTP_ADDR_SRC
;
3334 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3336 sctp_transport_dst_release(transport
);
3339 case SCTP_PARAM_DEL_IP
:
3341 sctp_del_bind_addr(bp
, &addr
);
3342 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3343 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3344 kfree(asoc
->asconf_addr_del_pending
);
3345 asoc
->asconf_addr_del_pending
= NULL
;
3348 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3350 sctp_transport_dst_release(transport
);
3358 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3359 * for the given asconf parameter. If there is no response for this parameter,
3360 * return the error code based on the third argument 'no_err'.
3362 * A7) If an error response is received for a TLV parameter, all TLVs with no
3363 * response before the failed TLV are considered successful if not reported.
3364 * All TLVs after the failed response are considered unsuccessful unless a
3365 * specific success indication is present for the parameter.
3367 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3368 sctp_addip_param_t
*asconf_param
,
3371 sctp_addip_param_t
*asconf_ack_param
;
3372 sctp_errhdr_t
*err_param
;
3378 err_code
= SCTP_ERROR_NO_ERROR
;
3380 err_code
= SCTP_ERROR_REQ_REFUSED
;
3382 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3383 sizeof(sctp_chunkhdr_t
);
3385 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3386 * the first asconf_ack parameter.
3388 length
= sizeof(sctp_addiphdr_t
);
3389 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3391 asconf_ack_len
-= length
;
3393 while (asconf_ack_len
> 0) {
3394 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3395 switch (asconf_ack_param
->param_hdr
.type
) {
3396 case SCTP_PARAM_SUCCESS_REPORT
:
3397 return SCTP_ERROR_NO_ERROR
;
3398 case SCTP_PARAM_ERR_CAUSE
:
3399 length
= sizeof(sctp_addip_param_t
);
3400 err_param
= (void *)asconf_ack_param
+ length
;
3401 asconf_ack_len
-= length
;
3402 if (asconf_ack_len
> 0)
3403 return err_param
->cause
;
3405 return SCTP_ERROR_INV_PARAM
;
3408 return SCTP_ERROR_INV_PARAM
;
3412 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3413 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3414 asconf_ack_len
-= length
;
3420 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3421 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3422 struct sctp_chunk
*asconf_ack
)
3424 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3425 union sctp_addr_param
*addr_param
;
3426 sctp_addip_param_t
*asconf_param
;
3428 int asconf_len
= asconf
->skb
->len
;
3429 int all_param_pass
= 0;
3432 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3434 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3435 * a pointer to address parameter.
3437 length
= sizeof(sctp_addip_chunk_t
);
3438 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3439 asconf_len
-= length
;
3441 /* Skip the address parameter in the last asconf sent and store a
3442 * pointer to the first asconf parameter.
3444 length
= ntohs(addr_param
->p
.length
);
3445 asconf_param
= (void *)addr_param
+ length
;
3446 asconf_len
-= length
;
3449 * A8) If there is no response(s) to specific TLV parameter(s), and no
3450 * failures are indicated, then all request(s) are considered
3453 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3456 /* Process the TLVs contained in the last sent ASCONF chunk. */
3457 while (asconf_len
> 0) {
3459 err_code
= SCTP_ERROR_NO_ERROR
;
3461 err_code
= sctp_get_asconf_response(asconf_ack
,
3464 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3469 case SCTP_ERROR_NO_ERROR
:
3470 sctp_asconf_param_success(asoc
, asconf_param
);
3473 case SCTP_ERROR_RSRC_LOW
:
3477 case SCTP_ERROR_UNKNOWN_PARAM
:
3478 /* Disable sending this type of asconf parameter in
3481 asoc
->peer
.addip_disabled_mask
|=
3482 asconf_param
->param_hdr
.type
;
3485 case SCTP_ERROR_REQ_REFUSED
:
3486 case SCTP_ERROR_DEL_LAST_IP
:
3487 case SCTP_ERROR_DEL_SRC_IP
:
3492 /* Skip the processed asconf parameter and move to the next
3495 length
= ntohs(asconf_param
->param_hdr
.length
);
3496 asconf_param
= (void *)asconf_param
+ length
;
3497 asconf_len
-= length
;
3500 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3501 asoc
->src_out_of_asoc_ok
= 0;
3502 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3505 /* Free the cached last sent asconf chunk. */
3506 list_del_init(&asconf
->transmitted_list
);
3507 sctp_chunk_free(asconf
);
3508 asoc
->addip_last_asconf
= NULL
;
3513 /* Make a FWD TSN chunk. */
3514 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3515 __u32 new_cum_tsn
, size_t nstreams
,
3516 struct sctp_fwdtsn_skip
*skiplist
)
3518 struct sctp_chunk
*retval
= NULL
;
3519 struct sctp_fwdtsn_hdr ftsn_hdr
;
3520 struct sctp_fwdtsn_skip skip
;
3524 hint
= (nstreams
+ 1) * sizeof(__u32
);
3526 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3531 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3532 retval
->subh
.fwdtsn_hdr
=
3533 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3535 for (i
= 0; i
< nstreams
; i
++) {
3536 skip
.stream
= skiplist
[i
].stream
;
3537 skip
.ssn
= skiplist
[i
].ssn
;
3538 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);
3544 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3546 * 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
3547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3548 * | Type = 130 | Chunk Flags | Chunk Length |
3549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3551 * / Re-configuration Parameter /
3553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3555 * / Re-configuration Parameter (optional) /
3557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3559 static struct sctp_chunk
*sctp_make_reconf(
3560 const struct sctp_association
*asoc
,
3563 struct sctp_reconf_chunk
*reconf
;
3564 struct sctp_chunk
*retval
;
3566 retval
= sctp_make_control(asoc
, SCTP_CID_RECONF
, 0, length
,
3571 reconf
= (struct sctp_reconf_chunk
*)retval
->chunk_hdr
;
3572 retval
->param_hdr
.v
= reconf
->params
;
3577 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3579 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
3580 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3581 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3582 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 * | Re-configuration Request Sequence Number |
3584 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3585 * | Re-configuration Response Sequence Number |
3586 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3587 * | Sender's Last Assigned TSN |
3588 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3589 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3590 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3592 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3593 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3594 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3596 * RE-CONFIG 4.2 (STREAM IN RESET)
3598 * 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
3599 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3600 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3601 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3602 * | Re-configuration Request Sequence Number |
3603 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3604 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3608 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3611 struct sctp_chunk
*sctp_make_strreset_req(
3612 const struct sctp_association
*asoc
,
3613 __u16 stream_num
, __u16
*stream_list
,
3616 struct sctp_strreset_outreq outreq
;
3617 __u16 stream_len
= stream_num
* 2;
3618 struct sctp_strreset_inreq inreq
;
3619 struct sctp_chunk
*retval
;
3620 __u16 outlen
, inlen
;
3622 outlen
= (sizeof(outreq
) + stream_len
) * out
;
3623 inlen
= (sizeof(inreq
) + stream_len
) * in
;
3625 retval
= sctp_make_reconf(asoc
, outlen
+ inlen
);
3630 outreq
.param_hdr
.type
= SCTP_PARAM_RESET_OUT_REQUEST
;
3631 outreq
.param_hdr
.length
= htons(outlen
);
3632 outreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3633 outreq
.response_seq
= htonl(asoc
->strreset_inseq
- 1);
3634 outreq
.send_reset_at_tsn
= htonl(asoc
->next_tsn
- 1);
3636 sctp_addto_chunk(retval
, sizeof(outreq
), &outreq
);
3639 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3643 inreq
.param_hdr
.type
= SCTP_PARAM_RESET_IN_REQUEST
;
3644 inreq
.param_hdr
.length
= htons(inlen
);
3645 inreq
.request_seq
= htonl(asoc
->strreset_outseq
+ out
);
3647 sctp_addto_chunk(retval
, sizeof(inreq
), &inreq
);
3650 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3656 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3658 * 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
3659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3660 * | Parameter Type = 15 | Parameter Length = 8 |
3661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3662 * | Re-configuration Request Sequence Number |
3663 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3665 struct sctp_chunk
*sctp_make_strreset_tsnreq(
3666 const struct sctp_association
*asoc
)
3668 struct sctp_strreset_tsnreq tsnreq
;
3669 __u16 length
= sizeof(tsnreq
);
3670 struct sctp_chunk
*retval
;
3672 retval
= sctp_make_reconf(asoc
, length
);
3676 tsnreq
.param_hdr
.type
= SCTP_PARAM_RESET_TSN_REQUEST
;
3677 tsnreq
.param_hdr
.length
= htons(length
);
3678 tsnreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3680 sctp_addto_chunk(retval
, sizeof(tsnreq
), &tsnreq
);
3685 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3687 * 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
3688 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3689 * | Parameter Type = 17 | Parameter Length = 12 |
3690 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3691 * | Re-configuration Request Sequence Number |
3692 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3693 * | Number of new streams | Reserved |
3694 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3696 struct sctp_chunk
*sctp_make_strreset_addstrm(
3697 const struct sctp_association
*asoc
,
3698 __u16 out
, __u16 in
)
3700 struct sctp_strreset_addstrm addstrm
;
3701 __u16 size
= sizeof(addstrm
);
3702 struct sctp_chunk
*retval
;
3704 retval
= sctp_make_reconf(asoc
, (!!out
+ !!in
) * size
);
3709 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_OUT_STREAMS
;
3710 addstrm
.param_hdr
.length
= htons(size
);
3711 addstrm
.number_of_streams
= htons(out
);
3712 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
);
3713 addstrm
.reserved
= 0;
3715 sctp_addto_chunk(retval
, size
, &addstrm
);
3719 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_IN_STREAMS
;
3720 addstrm
.param_hdr
.length
= htons(size
);
3721 addstrm
.number_of_streams
= htons(in
);
3722 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
+ !!out
);
3723 addstrm
.reserved
= 0;
3725 sctp_addto_chunk(retval
, size
, &addstrm
);
3731 /* RE-CONFIG 4.4 (RESP)
3733 * 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
3734 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3735 * | Parameter Type = 16 | Parameter Length |
3736 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3737 * | Re-configuration Response Sequence Number |
3738 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3740 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3742 struct sctp_chunk
*sctp_make_strreset_resp(
3743 const struct sctp_association
*asoc
,
3744 __u32 result
, __u32 sn
)
3746 struct sctp_strreset_resp resp
;
3747 __u16 length
= sizeof(resp
);
3748 struct sctp_chunk
*retval
;
3750 retval
= sctp_make_reconf(asoc
, length
);
3754 resp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3755 resp
.param_hdr
.length
= htons(length
);
3756 resp
.response_seq
= htonl(sn
);
3757 resp
.result
= htonl(result
);
3759 sctp_addto_chunk(retval
, sizeof(resp
), &resp
);
3764 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3766 * 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
3767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3768 * | Parameter Type = 16 | Parameter Length |
3769 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3770 * | Re-configuration Response Sequence Number |
3771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3773 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3774 * | Sender's Next TSN (optional) |
3775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3776 * | Receiver's Next TSN (optional) |
3777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3779 struct sctp_chunk
*sctp_make_strreset_tsnresp(
3780 struct sctp_association
*asoc
,
3781 __u32 result
, __u32 sn
,
3782 __u32 sender_tsn
, __u32 receiver_tsn
)
3784 struct sctp_strreset_resptsn tsnresp
;
3785 __u16 length
= sizeof(tsnresp
);
3786 struct sctp_chunk
*retval
;
3788 retval
= sctp_make_reconf(asoc
, length
);
3792 tsnresp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3793 tsnresp
.param_hdr
.length
= htons(length
);
3795 tsnresp
.response_seq
= htonl(sn
);
3796 tsnresp
.result
= htonl(result
);
3797 tsnresp
.senders_next_tsn
= htonl(sender_tsn
);
3798 tsnresp
.receivers_next_tsn
= htonl(receiver_tsn
);
3800 sctp_addto_chunk(retval
, sizeof(tsnresp
), &tsnresp
);
3805 bool sctp_verify_reconf(const struct sctp_association
*asoc
,
3806 struct sctp_chunk
*chunk
,
3807 struct sctp_paramhdr
**errp
)
3809 struct sctp_reconf_chunk
*hdr
;
3810 union sctp_params param
;
3811 __u16 last
= 0, cnt
= 0;
3813 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
3814 sctp_walk_params(param
, hdr
, params
) {
3815 __u16 length
= ntohs(param
.p
->length
);
3820 switch (param
.p
->type
) {
3821 case SCTP_PARAM_RESET_OUT_REQUEST
:
3822 if (length
< sizeof(struct sctp_strreset_outreq
) ||
3823 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3824 last
!= SCTP_PARAM_RESET_IN_REQUEST
))
3827 case SCTP_PARAM_RESET_IN_REQUEST
:
3828 if (length
< sizeof(struct sctp_strreset_inreq
) ||
3829 (last
&& last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3832 case SCTP_PARAM_RESET_RESPONSE
:
3833 if ((length
!= sizeof(struct sctp_strreset_resp
) &&
3834 length
!= sizeof(struct sctp_strreset_resptsn
)) ||
3835 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3836 last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3839 case SCTP_PARAM_RESET_TSN_REQUEST
:
3841 sizeof(struct sctp_strreset_tsnreq
) || last
)
3844 case SCTP_PARAM_RESET_ADD_IN_STREAMS
:
3845 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3846 (last
&& last
!= SCTP_PARAM_RESET_ADD_OUT_STREAMS
))
3849 case SCTP_PARAM_RESET_ADD_OUT_STREAMS
:
3850 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3851 (last
&& last
!= SCTP_PARAM_RESET_ADD_IN_STREAMS
))
3858 last
= param
.p
->type
;