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
)
114 af
= sctp_get_af_specific(ipver2af(ip_hdr(chunk
->skb
)->version
));
116 iif
= af
->skb_iif(chunk
->skb
);
121 /* RFC 2960 3.3.2 Initiation (INIT) (1)
123 * Note 2: The ECN capable field is reserved for future use of
124 * Explicit Congestion Notification.
126 static const struct sctp_paramhdr ecap_param
= {
127 SCTP_PARAM_ECN_CAPABLE
,
128 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
130 static const struct sctp_paramhdr prsctp_param
= {
131 SCTP_PARAM_FWD_TSN_SUPPORT
,
132 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
135 /* A helper to initialize an op error inside a
136 * provided chunk, as most cause codes will be embedded inside an
139 void sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
145 /* Cause code constants are now defined in network order. */
146 err
.cause
= cause_code
;
147 len
= sizeof(sctp_errhdr_t
) + paylen
;
148 err
.length
= htons(len
);
149 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(sctp_errhdr_t
), &err
);
152 /* A helper to initialize an op error inside a
153 * provided chunk, as most cause codes will be embedded inside an
154 * abort chunk. Differs from sctp_init_cause in that it won't oops
155 * if there isn't enough space in the op error chunk
157 static int sctp_init_cause_fixed(struct sctp_chunk
*chunk
, __be16 cause_code
,
163 /* Cause code constants are now defined in network order. */
164 err
.cause
= cause_code
;
165 len
= sizeof(sctp_errhdr_t
) + paylen
;
166 err
.length
= htons(len
);
168 if (skb_tailroom(chunk
->skb
) < len
)
170 chunk
->subh
.err_hdr
= sctp_addto_chunk_fixed(chunk
,
171 sizeof(sctp_errhdr_t
),
175 /* 3.3.2 Initiation (INIT) (1)
177 * This chunk is used to initiate a SCTP association between two
178 * endpoints. The format of the INIT chunk is shown below:
181 * 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
182 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
183 * | Type = 1 | Chunk Flags | Chunk Length |
184 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
187 * | Advertised Receiver Window Credit (a_rwnd) |
188 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
189 * | Number of Outbound Streams | Number of Inbound Streams |
190 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
192 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
194 * / Optional/Variable-Length Parameters /
196 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
199 * The INIT chunk contains the following parameters. Unless otherwise
200 * noted, each parameter MUST only be included once in the INIT chunk.
202 * Fixed Parameters Status
203 * ----------------------------------------------
204 * Initiate Tag Mandatory
205 * Advertised Receiver Window Credit Mandatory
206 * Number of Outbound Streams Mandatory
207 * Number of Inbound Streams Mandatory
208 * Initial TSN Mandatory
210 * Variable Parameters Status Type Value
211 * -------------------------------------------------------------
212 * IPv4 Address (Note 1) Optional 5
213 * IPv6 Address (Note 1) Optional 6
214 * Cookie Preservative Optional 9
215 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
216 * Host Name Address (Note 3) Optional 11
217 * Supported Address Types (Note 4) Optional 12
219 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
220 const struct sctp_bind_addr
*bp
,
221 gfp_t gfp
, int vparam_len
)
223 struct net
*net
= sock_net(asoc
->base
.sk
);
224 struct sctp_endpoint
*ep
= asoc
->ep
;
226 union sctp_params addrs
;
228 struct sctp_chunk
*retval
= NULL
;
229 int num_types
, addrs_len
= 0;
230 struct sctp_sock
*sp
;
231 sctp_supported_addrs_param_t sat
;
233 sctp_adaptation_ind_param_t aiparam
;
234 sctp_supported_ext_param_t ext_param
;
237 sctp_paramhdr_t
*auth_chunks
= NULL
,
240 /* RFC 2960 3.3.2 Initiation (INIT) (1)
242 * Note 1: The INIT chunks can contain multiple addresses that
243 * can be IPv4 and/or IPv6 in any combination.
247 /* Convert the provided bind address list to raw format. */
248 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
250 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
251 init
.a_rwnd
= htonl(asoc
->rwnd
);
252 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
253 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
254 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
256 /* How many address types are needed? */
257 sp
= sctp_sk(asoc
->base
.sk
);
258 num_types
= sp
->pf
->supported_addrs(sp
, types
);
260 chunksize
= sizeof(init
) + addrs_len
;
261 chunksize
+= WORD_ROUND(SCTP_SAT_LEN(num_types
));
262 chunksize
+= sizeof(ecap_param
);
264 if (asoc
->prsctp_enable
)
265 chunksize
+= sizeof(prsctp_param
);
267 /* ADDIP: Section 4.2.7:
268 * An implementation supporting this extension [ADDIP] MUST list
269 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
270 * INIT-ACK parameters.
272 if (net
->sctp
.addip_enable
) {
273 extensions
[num_ext
] = SCTP_CID_ASCONF
;
274 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
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
+= WORD_ROUND(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
+= WORD_ROUND(ntohs(auth_chunks
->length
));
302 extensions
[num_ext
] = SCTP_CID_AUTH
;
306 /* If we have any extensions to report, account for that */
308 chunksize
+= WORD_ROUND(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 (sp
->adaptation_ind
)
443 chunksize
+= sizeof(aiparam
);
445 if (asoc
->peer
.auth_capable
) {
446 auth_random
= (sctp_paramhdr_t
*)asoc
->c
.auth_random
;
447 chunksize
+= ntohs(auth_random
->length
);
449 auth_hmacs
= (sctp_paramhdr_t
*)asoc
->c
.auth_hmacs
;
450 if (auth_hmacs
->length
)
451 chunksize
+= WORD_ROUND(ntohs(auth_hmacs
->length
));
455 auth_chunks
= (sctp_paramhdr_t
*)asoc
->c
.auth_chunks
;
456 if (auth_chunks
->length
)
457 chunksize
+= WORD_ROUND(ntohs(auth_chunks
->length
));
461 extensions
[num_ext
] = SCTP_CID_AUTH
;
466 chunksize
+= WORD_ROUND(sizeof(sctp_supported_ext_param_t
) +
469 /* Now allocate and fill out the chunk. */
470 retval
= sctp_make_control(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
, gfp
);
474 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
476 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
477 * HEARTBEAT ACK, * etc.) to the same destination transport
478 * address from which it received the DATA or control chunk
479 * to which it is replying.
481 * [INIT ACK back to where the INIT came from.]
483 retval
->transport
= chunk
->transport
;
485 retval
->subh
.init_hdr
=
486 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
487 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
488 sctp_addto_chunk(retval
, cookie_len
, cookie
);
489 if (asoc
->peer
.ecn_capable
)
490 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
492 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
493 ext_param
.param_hdr
.length
=
494 htons(sizeof(sctp_supported_ext_param_t
) + num_ext
);
495 sctp_addto_chunk(retval
, sizeof(sctp_supported_ext_param_t
),
497 sctp_addto_param(retval
, num_ext
, extensions
);
499 if (asoc
->peer
.prsctp_capable
)
500 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
502 if (sp
->adaptation_ind
) {
503 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
504 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
505 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
506 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
509 if (asoc
->peer
.auth_capable
) {
510 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
513 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
516 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
520 /* We need to remove the const qualifier at this point. */
521 retval
->asoc
= (struct sctp_association
*) asoc
;
530 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
532 * This chunk is used only during the initialization of an association.
533 * It is sent by the initiator of an association to its peer to complete
534 * the initialization process. This chunk MUST precede any DATA chunk
535 * sent within the association, but MAY be bundled with one or more DATA
536 * chunks in the same packet.
539 * 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
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * | Type = 10 |Chunk Flags | Length |
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * Set to zero on transmit and ignored on receipt.
551 * Length: 16 bits (unsigned integer)
553 * Set to the size of the chunk in bytes, including the 4 bytes of
554 * the chunk header and the size of the Cookie.
556 * Cookie: variable size
558 * This field must contain the exact cookie received in the
559 * State Cookie parameter from the previous INIT ACK.
561 * An implementation SHOULD make the cookie as small as possible
562 * to insure interoperability.
564 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
565 const struct sctp_chunk
*chunk
)
567 struct sctp_chunk
*retval
;
571 cookie
= asoc
->peer
.cookie
;
572 cookie_len
= asoc
->peer
.cookie_len
;
574 /* Build a cookie echo chunk. */
575 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ECHO
, 0,
576 cookie_len
, GFP_ATOMIC
);
579 retval
->subh
.cookie_hdr
=
580 sctp_addto_chunk(retval
, cookie_len
, cookie
);
582 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
584 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
585 * HEARTBEAT ACK, * etc.) to the same destination transport
586 * address from which it * received the DATA or control chunk
587 * to which it is replying.
589 * [COOKIE ECHO back to where the INIT ACK came from.]
592 retval
->transport
= chunk
->transport
;
598 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
600 * This chunk is used only during the initialization of an
601 * association. It is used to acknowledge the receipt of a COOKIE
602 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
603 * within the association, but MAY be bundled with one or more DATA
604 * chunks or SACK chunk in the same SCTP packet.
607 * 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
608 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
609 * | Type = 11 |Chunk Flags | Length = 4 |
610 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * Chunk Flags: 8 bits
614 * Set to zero on transmit and ignored on receipt.
616 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
617 const struct sctp_chunk
*chunk
)
619 struct sctp_chunk
*retval
;
621 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0, GFP_ATOMIC
);
623 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
625 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
626 * HEARTBEAT ACK, * etc.) to the same destination transport
627 * address from which it * received the DATA or control chunk
628 * to which it is replying.
630 * [COOKIE ACK back to where the COOKIE ECHO came from.]
633 retval
->transport
= chunk
->transport
;
639 * Appendix A: Explicit Congestion Notification:
642 * RFC 2481 details a specific bit for a sender to send in the header of
643 * its next outbound TCP segment to indicate to its peer that it has
644 * reduced its congestion window. This is termed the CWR bit. For
645 * SCTP the same indication is made by including the CWR chunk.
646 * This chunk contains one data element, i.e. the TSN number that
647 * was sent in the ECNE chunk. This element represents the lowest
648 * TSN number in the datagram that was originally marked with the
652 * 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
653 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
654 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
655 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * | Lowest TSN Number |
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * Note: The CWR is considered a Control chunk.
661 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
662 const __u32 lowest_tsn
,
663 const struct sctp_chunk
*chunk
)
665 struct sctp_chunk
*retval
;
668 cwr
.lowest_tsn
= htonl(lowest_tsn
);
669 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_CWR
, 0,
670 sizeof(sctp_cwrhdr_t
), GFP_ATOMIC
);
675 retval
->subh
.ecn_cwr_hdr
=
676 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
678 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
680 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
681 * HEARTBEAT ACK, * etc.) to the same destination transport
682 * address from which it * received the DATA or control chunk
683 * to which it is replying.
685 * [Report a reduced congestion window back to where the ECNE
689 retval
->transport
= chunk
->transport
;
695 /* Make an ECNE chunk. This is a congestion experienced report. */
696 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
697 const __u32 lowest_tsn
)
699 struct sctp_chunk
*retval
;
702 ecne
.lowest_tsn
= htonl(lowest_tsn
);
703 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_ECNE
, 0,
704 sizeof(sctp_ecnehdr_t
), GFP_ATOMIC
);
707 retval
->subh
.ecne_hdr
=
708 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
714 static void sctp_set_prsctp_policy(struct sctp_chunk
*chunk
,
715 const struct sctp_sndrcvinfo
*sinfo
)
717 if (!chunk
->asoc
->prsctp_enable
)
720 if (SCTP_PR_TTL_ENABLED(sinfo
->sinfo_flags
))
721 chunk
->prsctp_param
=
722 jiffies
+ msecs_to_jiffies(sinfo
->sinfo_timetolive
);
723 else if (SCTP_PR_RTX_ENABLED(sinfo
->sinfo_flags
) ||
724 SCTP_PR_PRIO_ENABLED(sinfo
->sinfo_flags
))
725 chunk
->prsctp_param
= sinfo
->sinfo_timetolive
;
728 /* Make a DATA chunk for the given association from the provided
729 * parameters. However, do not populate the data payload.
731 struct sctp_chunk
*sctp_make_datafrag_empty(struct sctp_association
*asoc
,
732 const struct sctp_sndrcvinfo
*sinfo
,
733 int data_len
, __u8 flags
, __u16 ssn
,
736 struct sctp_chunk
*retval
;
737 struct sctp_datahdr dp
;
740 /* We assign the TSN as LATE as possible, not here when
741 * creating the chunk.
744 dp
.stream
= htons(sinfo
->sinfo_stream
);
745 dp
.ppid
= sinfo
->sinfo_ppid
;
747 /* Set the flags for an unordered send. */
748 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
) {
749 flags
|= SCTP_DATA_UNORDERED
;
754 chunk_len
= sizeof(dp
) + data_len
;
755 retval
= sctp_make_data(asoc
, flags
, chunk_len
, gfp
);
759 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
760 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
761 sctp_set_prsctp_policy(retval
, sinfo
);
767 /* Create a selective ackowledgement (SACK) for the given
768 * association. This reports on which TSN's we've seen to date,
769 * including duplicates and gaps.
771 struct sctp_chunk
*sctp_make_sack(const struct sctp_association
*asoc
)
773 struct sctp_chunk
*retval
;
774 struct sctp_sackhdr sack
;
777 __u16 num_gabs
, num_dup_tsns
;
778 struct sctp_association
*aptr
= (struct sctp_association
*)asoc
;
779 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
780 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
781 struct sctp_transport
*trans
;
783 memset(gabs
, 0, sizeof(gabs
));
784 ctsn
= sctp_tsnmap_get_ctsn(map
);
786 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__
, ctsn
);
788 /* How much room is needed in the chunk? */
789 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
790 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
792 /* Initialize the SACK header. */
793 sack
.cum_tsn_ack
= htonl(ctsn
);
794 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
795 sack
.num_gap_ack_blocks
= htons(num_gabs
);
796 sack
.num_dup_tsns
= htons(num_dup_tsns
);
799 + sizeof(struct sctp_gap_ack_block
) * num_gabs
800 + sizeof(__u32
) * num_dup_tsns
;
802 /* Create the chunk. */
803 retval
= sctp_make_control(asoc
, SCTP_CID_SACK
, 0, len
, GFP_ATOMIC
);
807 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
809 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
810 * HEARTBEAT ACK, etc.) to the same destination transport
811 * address from which it received the DATA or control chunk to
812 * which it is replying. This rule should also be followed if
813 * the endpoint is bundling DATA chunks together with the
816 * However, when acknowledging multiple DATA chunks received
817 * in packets from different source addresses in a single
818 * SACK, the SACK chunk may be transmitted to one of the
819 * destination transport addresses from which the DATA or
820 * control chunks being acknowledged were received.
822 * [BUG: We do not implement the following paragraph.
823 * Perhaps we should remember the last transport we used for a
824 * SACK and avoid that (if possible) if we have seen any
825 * duplicates. --piggy]
827 * When a receiver of a duplicate DATA chunk sends a SACK to a
828 * multi- homed endpoint it MAY be beneficial to vary the
829 * destination address and not use the source address of the
830 * DATA chunk. The reason being that receiving a duplicate
831 * from a multi-homed endpoint might indicate that the return
832 * path (as specified in the source address of the DATA chunk)
833 * for the SACK is broken.
835 * [Send to the address from which we last received a DATA chunk.]
837 retval
->transport
= asoc
->peer
.last_data_from
;
839 retval
->subh
.sack_hdr
=
840 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
842 /* Add the gap ack block information. */
844 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
847 /* Add the duplicate TSN information. */
849 aptr
->stats
.idupchunks
+= num_dup_tsns
;
850 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
851 sctp_tsnmap_get_dups(map
));
853 /* Once we have a sack generated, check to see what our sack
854 * generation is, if its 0, reset the transports to 0, and reset
855 * the association generation to 1
857 * The idea is that zero is never used as a valid generation for the
858 * association so no transport will match after a wrap event like this,
859 * Until the next sack
861 if (++aptr
->peer
.sack_generation
== 0) {
862 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
864 trans
->sack_generation
= 0;
865 aptr
->peer
.sack_generation
= 1;
871 /* Make a SHUTDOWN chunk. */
872 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
873 const struct sctp_chunk
*chunk
)
875 struct sctp_chunk
*retval
;
876 sctp_shutdownhdr_t shut
;
879 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
880 shut
.cum_tsn_ack
= htonl(ctsn
);
882 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN
, 0,
883 sizeof(sctp_shutdownhdr_t
), GFP_ATOMIC
);
887 retval
->subh
.shutdown_hdr
=
888 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
891 retval
->transport
= chunk
->transport
;
896 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
897 const struct sctp_chunk
*chunk
)
899 struct sctp_chunk
*retval
;
901 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0,
904 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
906 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
907 * HEARTBEAT ACK, * etc.) to the same destination transport
908 * address from which it * received the DATA or control chunk
909 * to which it is replying.
911 * [ACK back to where the SHUTDOWN came from.]
914 retval
->transport
= chunk
->transport
;
919 struct sctp_chunk
*sctp_make_shutdown_complete(
920 const struct sctp_association
*asoc
,
921 const struct sctp_chunk
*chunk
)
923 struct sctp_chunk
*retval
;
926 /* Set the T-bit if we have no association (vtag will be
929 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
931 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
,
934 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
936 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
937 * HEARTBEAT ACK, * etc.) to the same destination transport
938 * address from which it * received the DATA or control chunk
939 * to which it is replying.
941 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
945 retval
->transport
= chunk
->transport
;
950 /* Create an ABORT. Note that we set the T bit if we have no
951 * association, except when responding to an INIT (sctpimpguide 2.41).
953 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
954 const struct sctp_chunk
*chunk
,
957 struct sctp_chunk
*retval
;
960 /* Set the T-bit if we have no association and 'chunk' is not
961 * an INIT (vtag will be reflected).
964 if (chunk
&& chunk
->chunk_hdr
&&
965 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
968 flags
= SCTP_CHUNK_FLAG_T
;
971 retval
= sctp_make_control(asoc
, SCTP_CID_ABORT
, flags
, hint
,
974 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
976 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
977 * HEARTBEAT ACK, * etc.) to the same destination transport
978 * address from which it * received the DATA or control chunk
979 * to which it is replying.
981 * [ABORT back to where the offender came from.]
984 retval
->transport
= chunk
->transport
;
989 /* Helper to create ABORT with a NO_USER_DATA error. */
990 struct sctp_chunk
*sctp_make_abort_no_data(
991 const struct sctp_association
*asoc
,
992 const struct sctp_chunk
*chunk
, __u32 tsn
)
994 struct sctp_chunk
*retval
;
997 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
)
1003 /* Put the tsn back into network byte order. */
1004 payload
= htonl(tsn
);
1005 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
1006 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
1008 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1010 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1011 * HEARTBEAT ACK, * etc.) to the same destination transport
1012 * address from which it * received the DATA or control chunk
1013 * to which it is replying.
1015 * [ABORT back to where the offender came from.]
1018 retval
->transport
= chunk
->transport
;
1024 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1025 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
1029 struct sctp_chunk
*retval
;
1030 void *payload
= NULL
;
1033 retval
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
) + paylen
);
1038 /* Put the msg_iov together into payload. */
1039 payload
= kmalloc(paylen
, GFP_KERNEL
);
1043 err
= memcpy_from_msg(payload
, msg
, paylen
);
1048 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1049 sctp_addto_chunk(retval
, paylen
, payload
);
1059 sctp_chunk_free(retval
);
1065 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1068 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1072 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1074 target
= skb_put(chunk
->skb
, len
);
1077 memcpy(target
, data
, len
);
1079 memset(target
, 0, len
);
1081 /* Adjust the chunk length field. */
1082 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1083 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1088 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1089 struct sctp_chunk
*sctp_make_abort_violation(
1090 const struct sctp_association
*asoc
,
1091 const struct sctp_chunk
*chunk
,
1092 const __u8
*payload
,
1093 const size_t paylen
)
1095 struct sctp_chunk
*retval
;
1096 struct sctp_paramhdr phdr
;
1098 retval
= sctp_make_abort(asoc
, chunk
, sizeof(sctp_errhdr_t
) + paylen
1099 + sizeof(sctp_paramhdr_t
));
1103 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
1104 + sizeof(sctp_paramhdr_t
));
1106 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1107 phdr
.length
= chunk
->chunk_hdr
->length
;
1108 sctp_addto_chunk(retval
, paylen
, payload
);
1109 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), &phdr
);
1115 struct sctp_chunk
*sctp_make_violation_paramlen(
1116 const struct sctp_association
*asoc
,
1117 const struct sctp_chunk
*chunk
,
1118 struct sctp_paramhdr
*param
)
1120 struct sctp_chunk
*retval
;
1121 static const char error
[] = "The following parameter had invalid length:";
1122 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
) +
1123 sizeof(sctp_paramhdr_t
);
1125 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1129 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1130 sizeof(error
) + sizeof(sctp_paramhdr_t
));
1131 sctp_addto_chunk(retval
, sizeof(error
), error
);
1132 sctp_addto_param(retval
, sizeof(sctp_paramhdr_t
), param
);
1138 struct sctp_chunk
*sctp_make_violation_max_retrans(
1139 const struct sctp_association
*asoc
,
1140 const struct sctp_chunk
*chunk
)
1142 struct sctp_chunk
*retval
;
1143 static const char error
[] = "Association exceeded its max_retans count";
1144 size_t payload_len
= sizeof(error
) + sizeof(sctp_errhdr_t
);
1146 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1150 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1151 sctp_addto_chunk(retval
, sizeof(error
), error
);
1157 /* Make a HEARTBEAT chunk. */
1158 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1159 const struct sctp_transport
*transport
)
1161 struct sctp_chunk
*retval
;
1162 sctp_sender_hb_info_t hbinfo
;
1164 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT
, 0,
1165 sizeof(hbinfo
), GFP_ATOMIC
);
1170 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1171 hbinfo
.param_hdr
.length
= htons(sizeof(sctp_sender_hb_info_t
));
1172 hbinfo
.daddr
= transport
->ipaddr
;
1173 hbinfo
.sent_at
= jiffies
;
1174 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1176 /* Cast away the 'const', as this is just telling the chunk
1177 * what transport it belongs to.
1179 retval
->transport
= (struct sctp_transport
*) transport
;
1180 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1187 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1188 const struct sctp_chunk
*chunk
,
1189 const void *payload
, const size_t paylen
)
1191 struct sctp_chunk
*retval
;
1193 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
,
1198 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1200 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1202 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1203 * HEARTBEAT ACK, * etc.) to the same destination transport
1204 * address from which it * received the DATA or control chunk
1205 * to which it is replying.
1207 * [HBACK back to where the HEARTBEAT came from.]
1210 retval
->transport
= chunk
->transport
;
1216 /* Create an Operation Error chunk with the specified space reserved.
1217 * This routine can be used for containing multiple causes in the chunk.
1219 static struct sctp_chunk
*sctp_make_op_error_space(
1220 const struct sctp_association
*asoc
,
1221 const struct sctp_chunk
*chunk
,
1224 struct sctp_chunk
*retval
;
1226 retval
= sctp_make_control(asoc
, SCTP_CID_ERROR
, 0,
1227 sizeof(sctp_errhdr_t
) + size
, GFP_ATOMIC
);
1231 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1233 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1234 * HEARTBEAT ACK, etc.) to the same destination transport
1235 * address from which it received the DATA or control chunk
1236 * to which it is replying.
1240 retval
->transport
= chunk
->transport
;
1246 /* Create an Operation Error chunk of a fixed size,
1247 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1248 * This is a helper function to allocate an error chunk for
1249 * for those invalid parameter codes in which we may not want
1250 * to report all the errors, if the incoming chunk is large
1252 static inline struct sctp_chunk
*sctp_make_op_error_fixed(
1253 const struct sctp_association
*asoc
,
1254 const struct sctp_chunk
*chunk
)
1256 size_t size
= asoc
? asoc
->pathmtu
: 0;
1259 size
= SCTP_DEFAULT_MAXSEGMENT
;
1261 return sctp_make_op_error_space(asoc
, chunk
, size
);
1264 /* Create an Operation Error chunk. */
1265 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1266 const struct sctp_chunk
*chunk
,
1267 __be16 cause_code
, const void *payload
,
1268 size_t paylen
, size_t reserve_tail
)
1270 struct sctp_chunk
*retval
;
1272 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1276 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1277 sctp_addto_chunk(retval
, paylen
, payload
);
1279 sctp_addto_param(retval
, reserve_tail
, NULL
);
1285 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
)
1287 struct sctp_chunk
*retval
;
1288 struct sctp_hmac
*hmac_desc
;
1289 struct sctp_authhdr auth_hdr
;
1292 /* Get the first hmac that the peer told us to use */
1293 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1294 if (unlikely(!hmac_desc
))
1297 retval
= sctp_make_control(asoc
, SCTP_CID_AUTH
, 0,
1298 hmac_desc
->hmac_len
+ sizeof(sctp_authhdr_t
),
1303 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1304 auth_hdr
.shkey_id
= htons(asoc
->active_key_id
);
1306 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(sctp_authhdr_t
),
1309 hmac
= skb_put(retval
->skb
, hmac_desc
->hmac_len
);
1310 memset(hmac
, 0, hmac_desc
->hmac_len
);
1312 /* Adjust the chunk header to include the empty MAC */
1313 retval
->chunk_hdr
->length
=
1314 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1315 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1321 /********************************************************************
1322 * 2nd Level Abstractions
1323 ********************************************************************/
1325 /* Turn an skb into a chunk.
1326 * FIXME: Eventually move the structure directly inside the skb->cb[].
1328 * sctpimpguide-05.txt Section 2.8.2
1329 * M1) Each time a new DATA chunk is transmitted
1330 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1331 * 'TSN.Missing.Report' count will be used to determine missing chunks
1332 * and when to fast retransmit.
1335 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1336 const struct sctp_association
*asoc
,
1337 struct sock
*sk
, gfp_t gfp
)
1339 struct sctp_chunk
*retval
;
1341 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, gfp
);
1346 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1348 INIT_LIST_HEAD(&retval
->list
);
1350 retval
->asoc
= (struct sctp_association
*)asoc
;
1351 retval
->singleton
= 1;
1353 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1355 /* Polish the bead hole. */
1356 INIT_LIST_HEAD(&retval
->transmitted_list
);
1357 INIT_LIST_HEAD(&retval
->frag_list
);
1358 SCTP_DBG_OBJCNT_INC(chunk
);
1359 atomic_set(&retval
->refcnt
, 1);
1365 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1366 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1367 union sctp_addr
*dest
)
1369 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1370 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1373 /* Extract the source address from a chunk. */
1374 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1376 /* If we have a known transport, use that. */
1377 if (chunk
->transport
) {
1378 return &chunk
->transport
->ipaddr
;
1380 /* Otherwise, extract it from the IP header. */
1381 return &chunk
->source
;
1385 /* Create a new chunk, setting the type and flags headers from the
1386 * arguments, reserving enough space for a 'paylen' byte payload.
1388 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1389 __u8 type
, __u8 flags
, int paylen
,
1392 struct sctp_chunk
*retval
;
1393 sctp_chunkhdr_t
*chunk_hdr
;
1394 struct sk_buff
*skb
;
1397 /* No need to allocate LL here, as this is only a chunk. */
1398 skb
= alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t
) + paylen
), gfp
);
1402 /* Make room for the chunk header. */
1403 chunk_hdr
= (sctp_chunkhdr_t
*)skb_put(skb
, sizeof(sctp_chunkhdr_t
));
1404 chunk_hdr
->type
= type
;
1405 chunk_hdr
->flags
= flags
;
1406 chunk_hdr
->length
= htons(sizeof(sctp_chunkhdr_t
));
1408 sk
= asoc
? asoc
->base
.sk
: NULL
;
1409 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1415 retval
->chunk_hdr
= chunk_hdr
;
1416 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(struct sctp_chunkhdr
);
1418 /* Determine if the chunk needs to be authenticated */
1419 if (sctp_auth_send_cid(type
, asoc
))
1427 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1428 __u8 flags
, int paylen
, gfp_t gfp
)
1430 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1433 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1434 __u8 type
, __u8 flags
, int paylen
,
1437 struct sctp_chunk
*chunk
;
1439 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1441 sctp_control_set_owner_w(chunk
);
1446 /* Release the memory occupied by a chunk. */
1447 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1449 BUG_ON(!list_empty(&chunk
->list
));
1450 list_del_init(&chunk
->transmitted_list
);
1452 consume_skb(chunk
->skb
);
1453 consume_skb(chunk
->auth_chunk
);
1455 SCTP_DBG_OBJCNT_DEC(chunk
);
1456 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1459 /* Possibly, free the chunk. */
1460 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1462 /* Release our reference on the message tracker. */
1464 sctp_datamsg_put(chunk
->msg
);
1466 sctp_chunk_put(chunk
);
1469 /* Grab a reference to the chunk. */
1470 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1472 atomic_inc(&ch
->refcnt
);
1475 /* Release a reference to the chunk. */
1476 void sctp_chunk_put(struct sctp_chunk
*ch
)
1478 if (atomic_dec_and_test(&ch
->refcnt
))
1479 sctp_chunk_destroy(ch
);
1482 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1485 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1489 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1490 int padlen
= WORD_ROUND(chunklen
) - chunklen
;
1492 padding
= skb_put(chunk
->skb
, padlen
);
1493 target
= skb_put(chunk
->skb
, len
);
1495 memset(padding
, 0, padlen
);
1496 memcpy(target
, data
, len
);
1498 /* Adjust the chunk length field. */
1499 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1500 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1505 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1506 * space in the chunk
1508 static void *sctp_addto_chunk_fixed(struct sctp_chunk
*chunk
,
1509 int len
, const void *data
)
1511 if (skb_tailroom(chunk
->skb
) >= len
)
1512 return sctp_addto_chunk(chunk
, len
, data
);
1517 /* Append bytes from user space to the end of a chunk. Will panic if
1518 * chunk is not big enough.
1519 * Returns a kernel err value.
1521 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1522 struct iov_iter
*from
)
1527 /* Make room in chunk for data. */
1528 target
= skb_put(chunk
->skb
, len
);
1530 /* Copy data (whole iovec) into chunk */
1531 copied
= copy_from_iter(target
, len
, from
);
1535 /* Adjust the chunk length field. */
1536 chunk
->chunk_hdr
->length
=
1537 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1538 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1543 /* Helper function to assign a TSN if needed. This assumes that both
1544 * the data_hdr and association have already been assigned.
1546 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1548 struct sctp_datamsg
*msg
;
1549 struct sctp_chunk
*lchunk
;
1550 struct sctp_stream
*stream
;
1557 /* All fragments will be on the same stream */
1558 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1559 stream
= &chunk
->asoc
->ssnmap
->out
;
1561 /* Now assign the sequence number to the entire message.
1562 * All fragments must have the same stream sequence number.
1565 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1566 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1569 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1570 ssn
= sctp_ssn_next(stream
, sid
);
1572 ssn
= sctp_ssn_peek(stream
, sid
);
1575 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1576 lchunk
->has_ssn
= 1;
1580 /* Helper function to assign a TSN if needed. This assumes that both
1581 * the data_hdr and association have already been assigned.
1583 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1585 if (!chunk
->has_tsn
) {
1586 /* This is the last possible instant to
1589 chunk
->subh
.data_hdr
->tsn
=
1590 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1595 /* Create a CLOSED association to use with an incoming packet. */
1596 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1597 struct sctp_chunk
*chunk
,
1600 struct sctp_association
*asoc
;
1601 struct sk_buff
*skb
;
1605 /* Create the bare association. */
1606 scope
= sctp_scope(sctp_source(chunk
));
1607 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1612 /* Create an entry for the source address of the packet. */
1613 af
= sctp_get_af_specific(ipver2af(ip_hdr(skb
)->version
));
1616 af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1621 sctp_association_free(asoc
);
1625 /* Build a cookie representing asoc.
1626 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1628 static sctp_cookie_param_t
*sctp_pack_cookie(const struct sctp_endpoint
*ep
,
1629 const struct sctp_association
*asoc
,
1630 const struct sctp_chunk
*init_chunk
,
1632 const __u8
*raw_addrs
, int addrs_len
)
1634 sctp_cookie_param_t
*retval
;
1635 struct sctp_signed_cookie
*cookie
;
1636 int headersize
, bodysize
;
1638 /* Header size is static data prior to the actual cookie, including
1641 headersize
= sizeof(sctp_paramhdr_t
) +
1642 (sizeof(struct sctp_signed_cookie
) -
1643 sizeof(struct sctp_cookie
));
1644 bodysize
= sizeof(struct sctp_cookie
)
1645 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1647 /* Pad out the cookie to a multiple to make the signature
1648 * functions simpler to write.
1650 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1651 bodysize
+= SCTP_COOKIE_MULTIPLE
1652 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1653 *cookie_len
= headersize
+ bodysize
;
1655 /* Clear this memory since we are sending this data structure
1656 * out on the network.
1658 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1662 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1664 /* Set up the parameter header. */
1665 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1666 retval
->p
.length
= htons(*cookie_len
);
1668 /* Copy the cookie part of the association itself. */
1669 cookie
->c
= asoc
->c
;
1670 /* Save the raw address list length in the cookie. */
1671 cookie
->c
.raw_addr_list_len
= addrs_len
;
1673 /* Remember PR-SCTP capability. */
1674 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1676 /* Save adaptation indication in the cookie. */
1677 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1679 /* Set an expiration time for the cookie. */
1680 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1683 /* Copy the peer's init packet. */
1684 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1685 ntohs(init_chunk
->chunk_hdr
->length
));
1687 /* Copy the raw local address list of the association. */
1688 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1689 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1691 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1692 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1695 /* Sign the message. */
1696 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1699 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1700 sizeof(ep
->secret_key
)) ?:
1701 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1703 shash_desc_zero(desc
);
1717 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1718 struct sctp_association
*sctp_unpack_cookie(
1719 const struct sctp_endpoint
*ep
,
1720 const struct sctp_association
*asoc
,
1721 struct sctp_chunk
*chunk
, gfp_t gfp
,
1722 int *error
, struct sctp_chunk
**errp
)
1724 struct sctp_association
*retval
= NULL
;
1725 struct sctp_signed_cookie
*cookie
;
1726 struct sctp_cookie
*bear_cookie
;
1727 int headersize
, bodysize
, fixed_size
;
1728 __u8
*digest
= ep
->digest
;
1731 struct sk_buff
*skb
= chunk
->skb
;
1734 /* Header size is static data prior to the actual cookie, including
1737 headersize
= sizeof(sctp_chunkhdr_t
) +
1738 (sizeof(struct sctp_signed_cookie
) -
1739 sizeof(struct sctp_cookie
));
1740 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1741 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1743 /* Verify that the chunk looks like it even has a cookie.
1744 * There must be enough room for our cookie and our peer's
1747 len
= ntohs(chunk
->chunk_hdr
->length
);
1748 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1751 /* Verify that the cookie has been padded out. */
1752 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1755 /* Process the cookie. */
1756 cookie
= chunk
->subh
.cookie_hdr
;
1757 bear_cookie
= &cookie
->c
;
1759 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1762 /* Check the signature. */
1764 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1767 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1770 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1771 sizeof(ep
->secret_key
)) ?:
1772 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1774 shash_desc_zero(desc
);
1777 *error
= -SCTP_IERROR_NOMEM
;
1782 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1783 *error
= -SCTP_IERROR_BAD_SIG
;
1788 /* IG Section 2.35.2:
1789 * 3) Compare the port numbers and the verification tag contained
1790 * within the COOKIE ECHO chunk to the actual port numbers and the
1791 * verification tag within the SCTP common header of the received
1792 * packet. If these values do not match the packet MUST be silently
1795 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1796 *error
= -SCTP_IERROR_BAD_TAG
;
1800 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1801 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1802 *error
= -SCTP_IERROR_BAD_PORTS
;
1806 /* Check to see if the cookie is stale. If there is already
1807 * an association, there is no need to check cookie's expiration
1808 * for init collision case of lost COOKIE ACK.
1809 * If skb has been timestamped, then use the stamp, otherwise
1810 * use current time. This introduces a small possibility that
1811 * that a cookie may be considered expired, but his would only slow
1812 * down the new association establishment instead of every packet.
1814 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1815 kt
= skb_get_ktime(skb
);
1817 kt
= ktime_get_real();
1819 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1821 * Section 3.3.10.3 Stale Cookie Error (3)
1825 * Stale Cookie Error: Indicates the receipt of a valid State
1826 * Cookie that has expired.
1828 len
= ntohs(chunk
->chunk_hdr
->length
);
1829 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1831 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1832 __be32 n
= htonl(usecs
);
1834 sctp_init_cause(*errp
, SCTP_ERROR_STALE_COOKIE
,
1836 sctp_addto_chunk(*errp
, sizeof(n
), &n
);
1837 *error
= -SCTP_IERROR_STALE_COOKIE
;
1839 *error
= -SCTP_IERROR_NOMEM
;
1844 /* Make a new base association. */
1845 scope
= sctp_scope(sctp_source(chunk
));
1846 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1848 *error
= -SCTP_IERROR_NOMEM
;
1852 /* Set up our peer's port number. */
1853 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1855 /* Populate the association from the cookie. */
1856 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1858 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1860 *error
= -SCTP_IERROR_NOMEM
;
1864 /* Also, add the destination address. */
1865 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1866 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1867 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1871 retval
->next_tsn
= retval
->c
.initial_tsn
;
1872 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1873 retval
->addip_serial
= retval
->c
.initial_tsn
;
1874 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1875 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1876 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1878 /* The INIT stuff will be done by the side effects. */
1883 sctp_association_free(retval
);
1888 /* Yikes! The packet is either corrupt or deliberately
1891 *error
= -SCTP_IERROR_MALFORMED
;
1895 /********************************************************************
1896 * 3rd Level Abstractions
1897 ********************************************************************/
1899 struct __sctp_missing
{
1905 * Report a missing mandatory parameter.
1907 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1908 sctp_param_t paramtype
,
1909 struct sctp_chunk
*chunk
,
1910 struct sctp_chunk
**errp
)
1912 struct __sctp_missing report
;
1915 len
= WORD_ROUND(sizeof(report
));
1917 /* Make an ERROR chunk, preparing enough room for
1918 * returning multiple unknown parameters.
1921 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1924 report
.num_missing
= htonl(1);
1925 report
.type
= paramtype
;
1926 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1928 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1931 /* Stop processing this chunk. */
1935 /* Report an Invalid Mandatory Parameter. */
1936 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1937 struct sctp_chunk
*chunk
,
1938 struct sctp_chunk
**errp
)
1940 /* Invalid Mandatory Parameter Error has no payload. */
1943 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1946 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1948 /* Stop processing this chunk. */
1952 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1953 struct sctp_paramhdr
*param
,
1954 const struct sctp_chunk
*chunk
,
1955 struct sctp_chunk
**errp
)
1957 /* This is a fatal error. Any accumulated non-fatal errors are
1961 sctp_chunk_free(*errp
);
1963 /* Create an error chunk and fill it in with our payload. */
1964 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1970 /* Do not attempt to handle the HOST_NAME parm. However, do
1971 * send back an indicator to the peer.
1973 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1974 union sctp_params param
,
1975 struct sctp_chunk
*chunk
,
1976 struct sctp_chunk
**errp
)
1978 __u16 len
= ntohs(param
.p
->length
);
1980 /* Processing of the HOST_NAME parameter will generate an
1981 * ABORT. If we've accumulated any non-fatal errors, they
1982 * would be unrecognized parameters and we should not include
1983 * them in the ABORT.
1986 sctp_chunk_free(*errp
);
1988 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1991 sctp_init_cause(*errp
, SCTP_ERROR_DNS_FAILED
, len
);
1992 sctp_addto_chunk(*errp
, len
, param
.v
);
1995 /* Stop processing this chunk. */
1999 static int sctp_verify_ext_param(struct net
*net
, union sctp_params param
)
2001 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2003 int have_asconf
= 0;
2006 for (i
= 0; i
< num_ext
; i
++) {
2007 switch (param
.ext
->chunks
[i
]) {
2011 case SCTP_CID_ASCONF
:
2012 case SCTP_CID_ASCONF_ACK
:
2018 /* ADD-IP Security: The draft requires us to ABORT or ignore the
2019 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
2020 * only if ADD-IP is turned on and we are not backward-compatible
2023 if (net
->sctp
.addip_noauth
)
2026 if (net
->sctp
.addip_enable
&& !have_auth
&& have_asconf
)
2032 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2033 union sctp_params param
)
2035 struct net
*net
= sock_net(asoc
->base
.sk
);
2036 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2039 for (i
= 0; i
< num_ext
; i
++) {
2040 switch (param
.ext
->chunks
[i
]) {
2041 case SCTP_CID_FWD_TSN
:
2042 if (asoc
->prsctp_enable
&& !asoc
->peer
.prsctp_capable
)
2043 asoc
->peer
.prsctp_capable
= 1;
2046 /* if the peer reports AUTH, assume that he
2049 if (asoc
->ep
->auth_enable
)
2050 asoc
->peer
.auth_capable
= 1;
2052 case SCTP_CID_ASCONF
:
2053 case SCTP_CID_ASCONF_ACK
:
2054 if (net
->sctp
.addip_enable
)
2055 asoc
->peer
.asconf_capable
= 1;
2063 /* RFC 3.2.1 & the Implementers Guide 2.2.
2065 * The Parameter Types are encoded such that the
2066 * highest-order two bits specify the action that must be
2067 * taken if the processing endpoint does not recognize the
2070 * 00 - Stop processing this parameter; do not process any further
2071 * parameters within this chunk
2073 * 01 - Stop processing this parameter, do not process any further
2074 * parameters within this chunk, and report the unrecognized
2075 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2077 * 10 - Skip this parameter and continue processing.
2079 * 11 - Skip this parameter and continue processing but
2080 * report the unrecognized parameter in an
2081 * 'Unrecognized Parameter' ERROR chunk.
2084 * SCTP_IERROR_NO_ERROR - continue with the chunk
2085 * SCTP_IERROR_ERROR - stop and report an error.
2086 * SCTP_IERROR_NOMEME - out of memory.
2088 static sctp_ierror_t
sctp_process_unk_param(const struct sctp_association
*asoc
,
2089 union sctp_params param
,
2090 struct sctp_chunk
*chunk
,
2091 struct sctp_chunk
**errp
)
2093 int retval
= SCTP_IERROR_NO_ERROR
;
2095 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2096 case SCTP_PARAM_ACTION_DISCARD
:
2097 retval
= SCTP_IERROR_ERROR
;
2099 case SCTP_PARAM_ACTION_SKIP
:
2101 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2102 retval
= SCTP_IERROR_ERROR
;
2104 case SCTP_PARAM_ACTION_SKIP_ERR
:
2105 /* Make an ERROR chunk, preparing enough room for
2106 * returning multiple unknown parameters.
2109 *errp
= sctp_make_op_error_fixed(asoc
, chunk
);
2112 if (!sctp_init_cause_fixed(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2113 WORD_ROUND(ntohs(param
.p
->length
))))
2114 sctp_addto_chunk_fixed(*errp
,
2115 WORD_ROUND(ntohs(param
.p
->length
)),
2118 /* If there is no memory for generating the ERROR
2119 * report as specified, an ABORT will be triggered
2120 * to the peer and the association won't be
2123 retval
= SCTP_IERROR_NOMEM
;
2133 /* Verify variable length parameters
2135 * SCTP_IERROR_ABORT - trigger an ABORT
2136 * SCTP_IERROR_NOMEM - out of memory (abort)
2137 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2138 * SCTP_IERROR_NO_ERROR - continue with the chunk
2140 static sctp_ierror_t
sctp_verify_param(struct net
*net
,
2141 const struct sctp_endpoint
*ep
,
2142 const struct sctp_association
*asoc
,
2143 union sctp_params param
,
2145 struct sctp_chunk
*chunk
,
2146 struct sctp_chunk
**err_chunk
)
2148 struct sctp_hmac_algo_param
*hmacs
;
2149 int retval
= SCTP_IERROR_NO_ERROR
;
2150 __u16 n_elt
, id
= 0;
2153 /* FIXME - This routine is not looking at each parameter per the
2154 * chunk type, i.e., unrecognized parameters should be further
2155 * identified based on the chunk id.
2158 switch (param
.p
->type
) {
2159 case SCTP_PARAM_IPV4_ADDRESS
:
2160 case SCTP_PARAM_IPV6_ADDRESS
:
2161 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2162 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2163 case SCTP_PARAM_STATE_COOKIE
:
2164 case SCTP_PARAM_HEARTBEAT_INFO
:
2165 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2166 case SCTP_PARAM_ECN_CAPABLE
:
2167 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2170 case SCTP_PARAM_SUPPORTED_EXT
:
2171 if (!sctp_verify_ext_param(net
, param
))
2172 return SCTP_IERROR_ABORT
;
2175 case SCTP_PARAM_SET_PRIMARY
:
2176 if (net
->sctp
.addip_enable
)
2180 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2181 /* Tell the peer, we won't support this param. */
2182 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2183 retval
= SCTP_IERROR_ABORT
;
2186 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2187 if (ep
->prsctp_enable
)
2191 case SCTP_PARAM_RANDOM
:
2192 if (!ep
->auth_enable
)
2195 /* SCTP-AUTH: Secion 6.1
2196 * If the random number is not 32 byte long the association
2197 * MUST be aborted. The ABORT chunk SHOULD contain the error
2198 * cause 'Protocol Violation'.
2200 if (SCTP_AUTH_RANDOM_LENGTH
!=
2201 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) {
2202 sctp_process_inv_paramlength(asoc
, param
.p
,
2204 retval
= SCTP_IERROR_ABORT
;
2208 case SCTP_PARAM_CHUNKS
:
2209 if (!ep
->auth_enable
)
2212 /* SCTP-AUTH: Section 3.2
2213 * The CHUNKS parameter MUST be included once in the INIT or
2214 * INIT-ACK chunk if the sender wants to receive authenticated
2215 * chunks. Its maximum length is 260 bytes.
2217 if (260 < ntohs(param
.p
->length
)) {
2218 sctp_process_inv_paramlength(asoc
, param
.p
,
2220 retval
= SCTP_IERROR_ABORT
;
2224 case SCTP_PARAM_HMAC_ALGO
:
2225 if (!ep
->auth_enable
)
2228 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2229 n_elt
= (ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
)) >> 1;
2231 /* SCTP-AUTH: Section 6.1
2232 * The HMAC algorithm based on SHA-1 MUST be supported and
2233 * included in the HMAC-ALGO parameter.
2235 for (i
= 0; i
< n_elt
; i
++) {
2236 id
= ntohs(hmacs
->hmac_ids
[i
]);
2238 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2242 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2243 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2245 retval
= SCTP_IERROR_ABORT
;
2250 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2251 __func__
, ntohs(param
.p
->type
), cid
);
2253 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2259 /* Verify the INIT packet before we process it. */
2260 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2261 const struct sctp_association
*asoc
, sctp_cid_t cid
,
2262 sctp_init_chunk_t
*peer_init
, struct sctp_chunk
*chunk
,
2263 struct sctp_chunk
**errp
)
2265 union sctp_params param
;
2266 bool has_cookie
= false;
2269 /* Check for missing mandatory parameters. Note: Initial TSN is
2270 * also mandatory, but is not checked here since the valid range
2271 * is 0..2**32-1. RFC4960, section 3.3.3.
2273 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2274 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2275 peer_init
->init_hdr
.init_tag
== 0 ||
2276 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2277 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2279 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2280 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2284 /* There is a possibility that a parameter length was bad and
2285 * in that case we would have stoped walking the parameters.
2286 * The current param.p would point at the bad one.
2287 * Current consensus on the mailing list is to generate a PROTOCOL
2288 * VIOLATION error. We build the ERROR chunk here and let the normal
2289 * error handling code build and send the packet.
2291 if (param
.v
!= (void *)chunk
->chunk_end
)
2292 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2294 /* The only missing mandatory param possible today is
2295 * the state cookie for an INIT-ACK chunk.
2297 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2298 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2301 /* Verify all the variable length parameters */
2302 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2303 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2306 case SCTP_IERROR_ABORT
:
2307 case SCTP_IERROR_NOMEM
:
2309 case SCTP_IERROR_ERROR
:
2311 case SCTP_IERROR_NO_ERROR
:
2316 } /* for (loop through all parameters) */
2321 /* Unpack the parameters in an INIT packet into an association.
2322 * Returns 0 on failure, else success.
2323 * FIXME: This is an association method.
2325 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2326 const union sctp_addr
*peer_addr
,
2327 sctp_init_chunk_t
*peer_init
, gfp_t gfp
)
2329 struct net
*net
= sock_net(asoc
->base
.sk
);
2330 union sctp_params param
;
2331 struct sctp_transport
*transport
;
2332 struct list_head
*pos
, *temp
;
2334 union sctp_addr addr
;
2338 /* We must include the address that the INIT packet came from.
2339 * This is the only address that matters for an INIT packet.
2340 * When processing a COOKIE ECHO, we retrieve the from address
2341 * of the INIT from the cookie.
2344 /* This implementation defaults to making the first transport
2345 * added as the primary transport. The source address seems to
2346 * be a a better choice than any of the embedded addresses.
2348 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2351 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2354 /* Process the initialization parameters. */
2355 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2356 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2357 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2358 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2359 af
->from_addr_param(&addr
, param
.addr
,
2360 chunk
->sctp_hdr
->source
, 0);
2361 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2365 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2369 /* source address of chunk may not match any valid address */
2373 /* AUTH: After processing the parameters, make sure that we
2374 * have all the required info to potentially do authentications.
2376 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2377 !asoc
->peer
.peer_hmacs
))
2378 asoc
->peer
.auth_capable
= 0;
2380 /* In a non-backward compatible mode, if the peer claims
2381 * support for ADD-IP but not AUTH, the ADD-IP spec states
2382 * that we MUST ABORT the association. Section 6. The section
2383 * also give us an option to silently ignore the packet, which
2384 * is what we'll do here.
2386 if (!net
->sctp
.addip_noauth
&&
2387 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2388 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2390 SCTP_PARAM_SET_PRIMARY
);
2391 asoc
->peer
.asconf_capable
= 0;
2395 /* Walk list of transports, removing transports in the UNKNOWN state. */
2396 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2397 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2398 if (transport
->state
== SCTP_UNKNOWN
) {
2399 sctp_assoc_rm_peer(asoc
, transport
);
2403 /* The fixed INIT headers are always in network byte
2406 asoc
->peer
.i
.init_tag
=
2407 ntohl(peer_init
->init_hdr
.init_tag
);
2408 asoc
->peer
.i
.a_rwnd
=
2409 ntohl(peer_init
->init_hdr
.a_rwnd
);
2410 asoc
->peer
.i
.num_outbound_streams
=
2411 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2412 asoc
->peer
.i
.num_inbound_streams
=
2413 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2414 asoc
->peer
.i
.initial_tsn
=
2415 ntohl(peer_init
->init_hdr
.initial_tsn
);
2417 /* Apply the upper bounds for output streams based on peer's
2418 * number of inbound streams.
2420 if (asoc
->c
.sinit_num_ostreams
>
2421 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2422 asoc
->c
.sinit_num_ostreams
=
2423 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2426 if (asoc
->c
.sinit_max_instreams
>
2427 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2428 asoc
->c
.sinit_max_instreams
=
2429 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2432 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2433 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2435 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2436 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2438 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2439 cookie
= asoc
->peer
.cookie
;
2441 asoc
->peer
.cookie
= kmemdup(cookie
, asoc
->peer
.cookie_len
, gfp
);
2442 if (!asoc
->peer
.cookie
)
2446 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2447 * high (for example, implementations MAY use the size of the receiver
2448 * advertised window).
2450 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2452 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2455 /* Set up the TSN tracking pieces. */
2456 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2457 asoc
->peer
.i
.initial_tsn
, gfp
))
2460 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2462 * The stream sequence number in all the streams shall start
2463 * from 0 when the association is established. Also, when the
2464 * stream sequence number reaches the value 65535 the next
2465 * stream sequence number shall be set to 0.
2468 /* Allocate storage for the negotiated streams if it is not a temporary
2474 asoc
->ssnmap
= sctp_ssnmap_new(asoc
->c
.sinit_max_instreams
,
2475 asoc
->c
.sinit_num_ostreams
, gfp
);
2479 error
= sctp_assoc_set_id(asoc
, gfp
);
2484 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2486 * When an endpoint has an ASCONF signaled change to be sent to the
2487 * remote endpoint it should do the following:
2489 * A2) A serial number should be assigned to the Chunk. The serial
2490 * number should be a monotonically increasing number. All serial
2491 * numbers are defined to be initialized at the start of the
2492 * association to the same value as the Initial TSN.
2494 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2498 /* Release the transport structures. */
2499 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2500 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2501 if (transport
->state
!= SCTP_ACTIVE
)
2502 sctp_assoc_rm_peer(asoc
, transport
);
2510 /* Update asoc with the option described in param.
2512 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2514 * asoc is the association to update.
2515 * param is the variable length parameter to use for update.
2516 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2517 * If the current packet is an INIT we want to minimize the amount of
2518 * work we do. In particular, we should not build transport
2519 * structures for the addresses.
2521 static int sctp_process_param(struct sctp_association
*asoc
,
2522 union sctp_params param
,
2523 const union sctp_addr
*peer_addr
,
2526 struct net
*net
= sock_net(asoc
->base
.sk
);
2527 union sctp_addr addr
;
2534 union sctp_addr_param
*addr_param
;
2535 struct sctp_transport
*t
;
2536 struct sctp_endpoint
*ep
= asoc
->ep
;
2538 /* We maintain all INIT parameters in network byte order all the
2539 * time. This allows us to not worry about whether the parameters
2540 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2542 switch (param
.p
->type
) {
2543 case SCTP_PARAM_IPV6_ADDRESS
:
2544 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2548 case SCTP_PARAM_IPV4_ADDRESS
:
2549 /* v4 addresses are not allowed on v6-only socket */
2550 if (ipv6_only_sock(asoc
->base
.sk
))
2553 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2554 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2555 scope
= sctp_scope(peer_addr
);
2556 if (sctp_in_scope(net
, &addr
, scope
))
2557 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2561 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2562 if (!net
->sctp
.cookie_preserve_enable
)
2565 stale
= ntohl(param
.life
->lifespan_increment
);
2567 /* Suggested Cookie Life span increment's unit is msec,
2570 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2573 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2574 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2577 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2578 /* Turn off the default values first so we'll know which
2579 * ones are really set by the peer.
2581 asoc
->peer
.ipv4_address
= 0;
2582 asoc
->peer
.ipv6_address
= 0;
2584 /* Assume that peer supports the address family
2585 * by which it sends a packet.
2587 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2588 asoc
->peer
.ipv6_address
= 1;
2589 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2590 asoc
->peer
.ipv4_address
= 1;
2592 /* Cycle through address types; avoid divide by 0. */
2593 sat
= ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2595 sat
/= sizeof(__u16
);
2597 for (i
= 0; i
< sat
; ++i
) {
2598 switch (param
.sat
->types
[i
]) {
2599 case SCTP_PARAM_IPV4_ADDRESS
:
2600 asoc
->peer
.ipv4_address
= 1;
2603 case SCTP_PARAM_IPV6_ADDRESS
:
2604 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2605 asoc
->peer
.ipv6_address
= 1;
2608 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2609 asoc
->peer
.hostname_address
= 1;
2612 default: /* Just ignore anything else. */
2618 case SCTP_PARAM_STATE_COOKIE
:
2619 asoc
->peer
.cookie_len
=
2620 ntohs(param
.p
->length
) - sizeof(sctp_paramhdr_t
);
2621 asoc
->peer
.cookie
= param
.cookie
->body
;
2624 case SCTP_PARAM_HEARTBEAT_INFO
:
2625 /* Would be odd to receive, but it causes no problems. */
2628 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2629 /* Rejected during verify stage. */
2632 case SCTP_PARAM_ECN_CAPABLE
:
2633 asoc
->peer
.ecn_capable
= 1;
2636 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2637 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2640 case SCTP_PARAM_SET_PRIMARY
:
2641 if (!net
->sctp
.addip_enable
)
2644 addr_param
= param
.v
+ sizeof(sctp_addip_param_t
);
2646 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2650 af
->from_addr_param(&addr
, addr_param
,
2651 htons(asoc
->peer
.port
), 0);
2653 /* if the address is invalid, we can't process it.
2654 * XXX: see spec for what to do.
2656 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2659 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2663 sctp_assoc_set_primary(asoc
, t
);
2666 case SCTP_PARAM_SUPPORTED_EXT
:
2667 sctp_process_ext_param(asoc
, param
);
2670 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2671 if (asoc
->prsctp_enable
) {
2672 asoc
->peer
.prsctp_capable
= 1;
2678 case SCTP_PARAM_RANDOM
:
2679 if (!ep
->auth_enable
)
2682 /* Save peer's random parameter */
2683 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2684 ntohs(param
.p
->length
), gfp
);
2685 if (!asoc
->peer
.peer_random
) {
2691 case SCTP_PARAM_HMAC_ALGO
:
2692 if (!ep
->auth_enable
)
2695 /* Save peer's HMAC list */
2696 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2697 ntohs(param
.p
->length
), gfp
);
2698 if (!asoc
->peer
.peer_hmacs
) {
2703 /* Set the default HMAC the peer requested*/
2704 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2707 case SCTP_PARAM_CHUNKS
:
2708 if (!ep
->auth_enable
)
2711 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2712 ntohs(param
.p
->length
), gfp
);
2713 if (!asoc
->peer
.peer_chunks
)
2718 /* Any unrecognized parameters should have been caught
2719 * and handled by sctp_verify_param() which should be
2720 * called prior to this routine. Simply log the error
2723 pr_debug("%s: ignoring param:%d for association:%p.\n",
2724 __func__
, ntohs(param
.p
->type
), asoc
);
2731 /* Select a new verification tag. */
2732 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2734 /* I believe that this random number generator complies with RFC1750.
2735 * A tag of 0 is reserved for special cases (e.g. INIT).
2740 get_random_bytes(&x
, sizeof(__u32
));
2746 /* Select an initial TSN to send during startup. */
2747 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2751 get_random_bytes(&retval
, sizeof(__u32
));
2756 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2758 * 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
2759 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2760 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2764 * | Address Parameter |
2765 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2766 * | ASCONF Parameter #1 |
2767 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2771 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2772 * | ASCONF Parameter #N |
2773 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2775 * Address Parameter and other parameter will not be wrapped in this function
2777 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2778 union sctp_addr
*addr
,
2781 sctp_addiphdr_t asconf
;
2782 struct sctp_chunk
*retval
;
2783 int length
= sizeof(asconf
) + vparam_len
;
2784 union sctp_addr_param addrparam
;
2786 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2788 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2793 /* Create the chunk. */
2794 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2799 asconf
.serial
= htonl(asoc
->addip_serial
++);
2801 retval
->subh
.addip_hdr
=
2802 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2803 retval
->param_hdr
.v
=
2804 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2810 * 3.2.1 Add IP Address
2812 * 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
2813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2814 * | Type = 0xC001 | Length = Variable |
2815 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2816 * | ASCONF-Request Correlation ID |
2817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2818 * | Address Parameter |
2819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2821 * 3.2.2 Delete IP Address
2823 * 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
2824 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2825 * | Type = 0xC002 | Length = Variable |
2826 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2827 * | ASCONF-Request Correlation ID |
2828 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2829 * | Address Parameter |
2830 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2833 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2834 union sctp_addr
*laddr
,
2835 struct sockaddr
*addrs
,
2839 sctp_addip_param_t param
;
2840 struct sctp_chunk
*retval
;
2841 union sctp_addr_param addr_param
;
2842 union sctp_addr
*addr
;
2845 int paramlen
= sizeof(param
);
2846 int addr_param_len
= 0;
2851 /* Get total length of all the address parameters. */
2853 for (i
= 0; i
< addrcnt
; i
++) {
2855 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2856 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2858 totallen
+= paramlen
;
2859 totallen
+= addr_param_len
;
2861 addr_buf
+= af
->sockaddr_len
;
2862 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2863 /* reuse the parameter length from the same scope one */
2864 totallen
+= paramlen
;
2865 totallen
+= addr_param_len
;
2868 pr_debug("%s: picked same-scope del_pending addr, "
2869 "totallen for all addresses is %d\n",
2870 __func__
, totallen
);
2874 /* Create an asconf chunk with the required length. */
2875 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2879 /* Add the address parameters to the asconf chunk. */
2881 for (i
= 0; i
< addrcnt
; i
++) {
2883 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2884 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2885 param
.param_hdr
.type
= flags
;
2886 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2889 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2890 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2892 addr_buf
+= af
->sockaddr_len
;
2894 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2895 addr
= asoc
->asconf_addr_del_pending
;
2896 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2897 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2898 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2899 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2902 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2903 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2909 * 3.2.4 Set Primary IP Address
2911 * 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
2912 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2913 * | Type =0xC004 | Length = Variable |
2914 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2915 * | ASCONF-Request Correlation ID |
2916 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2917 * | Address Parameter |
2918 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2920 * Create an ASCONF chunk with Set Primary IP address parameter.
2922 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2923 union sctp_addr
*addr
)
2925 sctp_addip_param_t param
;
2926 struct sctp_chunk
*retval
;
2927 int len
= sizeof(param
);
2928 union sctp_addr_param addrparam
;
2930 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2932 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2937 /* Create the chunk and make asconf header. */
2938 retval
= sctp_make_asconf(asoc
, addr
, len
);
2942 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2943 param
.param_hdr
.length
= htons(len
);
2946 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2947 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2952 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2954 * 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
2955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2956 * | Type = 0x80 | Chunk Flags | Chunk Length |
2957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2959 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2960 * | ASCONF Parameter Response#1 |
2961 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2966 * | ASCONF Parameter Response#N |
2967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2969 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2971 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2972 __u32 serial
, int vparam_len
)
2974 sctp_addiphdr_t asconf
;
2975 struct sctp_chunk
*retval
;
2976 int length
= sizeof(asconf
) + vparam_len
;
2978 /* Create the chunk. */
2979 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2984 asconf
.serial
= htonl(serial
);
2986 retval
->subh
.addip_hdr
=
2987 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2992 /* Add response parameters to an ASCONF_ACK chunk. */
2993 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2994 __be16 err_code
, sctp_addip_param_t
*asconf_param
)
2996 sctp_addip_param_t ack_param
;
2997 sctp_errhdr_t err_param
;
2998 int asconf_param_len
= 0;
2999 int err_param_len
= 0;
3000 __be16 response_type
;
3002 if (SCTP_ERROR_NO_ERROR
== err_code
) {
3003 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
3005 response_type
= SCTP_PARAM_ERR_CAUSE
;
3006 err_param_len
= sizeof(err_param
);
3009 ntohs(asconf_param
->param_hdr
.length
);
3012 /* Add Success Indication or Error Cause Indication parameter. */
3013 ack_param
.param_hdr
.type
= response_type
;
3014 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
3017 ack_param
.crr_id
= crr_id
;
3018 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
3020 if (SCTP_ERROR_NO_ERROR
== err_code
)
3023 /* Add Error Cause parameter. */
3024 err_param
.cause
= err_code
;
3025 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
3026 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
3028 /* Add the failed TLV copied from ASCONF chunk. */
3030 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3033 /* Process a asconf parameter. */
3034 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3035 struct sctp_chunk
*asconf
,
3036 sctp_addip_param_t
*asconf_param
)
3038 struct sctp_transport
*peer
;
3040 union sctp_addr addr
;
3041 union sctp_addr_param
*addr_param
;
3043 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3045 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3046 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3047 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3048 return SCTP_ERROR_UNKNOWN_PARAM
;
3050 switch (addr_param
->p
.type
) {
3051 case SCTP_PARAM_IPV6_ADDRESS
:
3052 if (!asoc
->peer
.ipv6_address
)
3053 return SCTP_ERROR_DNS_FAILED
;
3055 case SCTP_PARAM_IPV4_ADDRESS
:
3056 if (!asoc
->peer
.ipv4_address
)
3057 return SCTP_ERROR_DNS_FAILED
;
3060 return SCTP_ERROR_DNS_FAILED
;
3063 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3065 return SCTP_ERROR_DNS_FAILED
;
3067 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3069 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3070 * or multicast address.
3071 * (note: wildcard is permitted and requires special handling so
3072 * make sure we check for that)
3074 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3075 return SCTP_ERROR_DNS_FAILED
;
3077 switch (asconf_param
->param_hdr
.type
) {
3078 case SCTP_PARAM_ADD_IP
:
3080 * If the address 0.0.0.0 or ::0 is provided, the source
3081 * address of the packet MUST be added.
3083 if (af
->is_any(&addr
))
3084 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3086 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3087 * request and does not have the local resources to add this
3088 * new address to the association, it MUST return an Error
3089 * Cause TLV set to the new error code 'Operation Refused
3090 * Due to Resource Shortage'.
3093 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3095 return SCTP_ERROR_RSRC_LOW
;
3097 /* Start the heartbeat timer. */
3098 sctp_transport_reset_hb_timer(peer
);
3099 asoc
->new_transport
= peer
;
3101 case SCTP_PARAM_DEL_IP
:
3102 /* ADDIP 4.3 D7) If a request is received to delete the
3103 * last remaining IP address of a peer endpoint, the receiver
3104 * MUST send an Error Cause TLV with the error cause set to the
3105 * new error code 'Request to Delete Last Remaining IP Address'.
3107 if (asoc
->peer
.transport_count
== 1)
3108 return SCTP_ERROR_DEL_LAST_IP
;
3110 /* ADDIP 4.3 D8) If a request is received to delete an IP
3111 * address which is also the source address of the IP packet
3112 * which contained the ASCONF chunk, the receiver MUST reject
3113 * this request. To reject the request the receiver MUST send
3114 * an Error Cause TLV set to the new error code 'Request to
3115 * Delete Source IP Address'
3117 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3118 return SCTP_ERROR_DEL_SRC_IP
;
3121 * If the address 0.0.0.0 or ::0 is provided, all
3122 * addresses of the peer except the source address of the
3123 * packet MUST be deleted.
3125 if (af
->is_any(&addr
)) {
3126 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3127 sctp_assoc_del_nonprimary_peers(asoc
,
3129 return SCTP_ERROR_NO_ERROR
;
3132 /* If the address is not part of the association, the
3133 * ASCONF-ACK with Error Cause Indication Parameter
3134 * which including cause of Unresolvable Address should
3137 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3139 return SCTP_ERROR_DNS_FAILED
;
3141 sctp_assoc_rm_peer(asoc
, peer
);
3143 case SCTP_PARAM_SET_PRIMARY
:
3144 /* ADDIP Section 4.2.4
3145 * If the address 0.0.0.0 or ::0 is provided, the receiver
3146 * MAY mark the source address of the packet as its
3149 if (af
->is_any(&addr
))
3150 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3152 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3154 return SCTP_ERROR_DNS_FAILED
;
3156 sctp_assoc_set_primary(asoc
, peer
);
3160 return SCTP_ERROR_NO_ERROR
;
3163 /* Verify the ASCONF packet before we process it. */
3164 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3165 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3166 struct sctp_paramhdr
**errp
)
3168 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) chunk
->chunk_hdr
;
3169 union sctp_params param
;
3170 bool addr_param_seen
= false;
3172 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3173 size_t length
= ntohs(param
.p
->length
);
3176 switch (param
.p
->type
) {
3177 case SCTP_PARAM_ERR_CAUSE
:
3179 case SCTP_PARAM_IPV4_ADDRESS
:
3180 if (length
!= sizeof(sctp_ipv4addr_param_t
))
3182 /* ensure there is only one addr param and it's in the
3183 * beginning of addip_hdr params, or we reject it.
3185 if (param
.v
!= addip
->addip_hdr
.params
)
3187 addr_param_seen
= true;
3189 case SCTP_PARAM_IPV6_ADDRESS
:
3190 if (length
!= sizeof(sctp_ipv6addr_param_t
))
3192 if (param
.v
!= addip
->addip_hdr
.params
)
3194 addr_param_seen
= true;
3196 case SCTP_PARAM_ADD_IP
:
3197 case SCTP_PARAM_DEL_IP
:
3198 case SCTP_PARAM_SET_PRIMARY
:
3199 /* In ASCONF chunks, these need to be first. */
3200 if (addr_param_needed
&& !addr_param_seen
)
3202 length
= ntohs(param
.addip
->param_hdr
.length
);
3203 if (length
< sizeof(sctp_addip_param_t
) +
3204 sizeof(sctp_paramhdr_t
))
3207 case SCTP_PARAM_SUCCESS_REPORT
:
3208 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3209 if (length
!= sizeof(sctp_addip_param_t
))
3213 /* This is unkown to us, reject! */
3218 /* Remaining sanity checks. */
3219 if (addr_param_needed
&& !addr_param_seen
)
3221 if (!addr_param_needed
&& addr_param_seen
)
3223 if (param
.v
!= chunk
->chunk_end
)
3229 /* Process an incoming ASCONF chunk with the next expected serial no. and
3230 * return an ASCONF_ACK chunk to be sent in response.
3232 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3233 struct sctp_chunk
*asconf
)
3235 sctp_addip_chunk_t
*addip
= (sctp_addip_chunk_t
*) asconf
->chunk_hdr
;
3236 bool all_param_pass
= true;
3237 union sctp_params param
;
3238 sctp_addiphdr_t
*hdr
;
3239 union sctp_addr_param
*addr_param
;
3240 sctp_addip_param_t
*asconf_param
;
3241 struct sctp_chunk
*asconf_ack
;
3247 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) - sizeof(sctp_chunkhdr_t
);
3248 hdr
= (sctp_addiphdr_t
*)asconf
->skb
->data
;
3249 serial
= ntohl(hdr
->serial
);
3251 /* Skip the addiphdr and store a pointer to address parameter. */
3252 length
= sizeof(sctp_addiphdr_t
);
3253 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3254 chunk_len
-= length
;
3256 /* Skip the address parameter and store a pointer to the first
3259 length
= ntohs(addr_param
->p
.length
);
3260 asconf_param
= (void *)addr_param
+ length
;
3261 chunk_len
-= length
;
3263 /* create an ASCONF_ACK chunk.
3264 * Based on the definitions of parameters, we know that the size of
3265 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3268 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3272 /* Process the TLVs contained within the ASCONF chunk. */
3273 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3274 /* Skip preceeding address parameters. */
3275 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3276 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3279 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3282 * If an error response is received for a TLV parameter,
3283 * all TLVs with no response before the failed TLV are
3284 * considered successful if not reported. All TLVs after
3285 * the failed response are considered unsuccessful unless
3286 * a specific success indication is present for the parameter.
3288 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3289 all_param_pass
= false;
3290 if (!all_param_pass
)
3291 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3292 err_code
, param
.addip
);
3294 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3295 * an IP address sends an 'Out of Resource' in its response, it
3296 * MUST also fail any subsequent add or delete requests bundled
3299 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3303 asoc
->peer
.addip_serial
++;
3305 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3306 * after freeing the reference to old asconf ack if any.
3309 sctp_chunk_hold(asconf_ack
);
3310 list_add_tail(&asconf_ack
->transmitted_list
,
3311 &asoc
->asconf_ack_list
);
3317 /* Process a asconf parameter that is successfully acked. */
3318 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3319 sctp_addip_param_t
*asconf_param
)
3322 union sctp_addr addr
;
3323 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3324 union sctp_addr_param
*addr_param
;
3325 struct sctp_transport
*transport
;
3326 struct sctp_sockaddr_entry
*saddr
;
3328 addr_param
= (void *)asconf_param
+ sizeof(sctp_addip_param_t
);
3330 /* We have checked the packet before, so we do not check again. */
3331 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3332 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3334 switch (asconf_param
->param_hdr
.type
) {
3335 case SCTP_PARAM_ADD_IP
:
3336 /* This is always done in BH context with a socket lock
3337 * held, so the list can not change.
3340 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3341 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3342 saddr
->state
= SCTP_ADDR_SRC
;
3345 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3347 dst_release(transport
->dst
);
3348 transport
->dst
= NULL
;
3351 case SCTP_PARAM_DEL_IP
:
3353 sctp_del_bind_addr(bp
, &addr
);
3354 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3355 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3356 kfree(asoc
->asconf_addr_del_pending
);
3357 asoc
->asconf_addr_del_pending
= NULL
;
3360 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3362 dst_release(transport
->dst
);
3363 transport
->dst
= NULL
;
3371 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3372 * for the given asconf parameter. If there is no response for this parameter,
3373 * return the error code based on the third argument 'no_err'.
3375 * A7) If an error response is received for a TLV parameter, all TLVs with no
3376 * response before the failed TLV are considered successful if not reported.
3377 * All TLVs after the failed response are considered unsuccessful unless a
3378 * specific success indication is present for the parameter.
3380 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3381 sctp_addip_param_t
*asconf_param
,
3384 sctp_addip_param_t
*asconf_ack_param
;
3385 sctp_errhdr_t
*err_param
;
3391 err_code
= SCTP_ERROR_NO_ERROR
;
3393 err_code
= SCTP_ERROR_REQ_REFUSED
;
3395 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3396 sizeof(sctp_chunkhdr_t
);
3398 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3399 * the first asconf_ack parameter.
3401 length
= sizeof(sctp_addiphdr_t
);
3402 asconf_ack_param
= (sctp_addip_param_t
*)(asconf_ack
->skb
->data
+
3404 asconf_ack_len
-= length
;
3406 while (asconf_ack_len
> 0) {
3407 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3408 switch (asconf_ack_param
->param_hdr
.type
) {
3409 case SCTP_PARAM_SUCCESS_REPORT
:
3410 return SCTP_ERROR_NO_ERROR
;
3411 case SCTP_PARAM_ERR_CAUSE
:
3412 length
= sizeof(sctp_addip_param_t
);
3413 err_param
= (void *)asconf_ack_param
+ length
;
3414 asconf_ack_len
-= length
;
3415 if (asconf_ack_len
> 0)
3416 return err_param
->cause
;
3418 return SCTP_ERROR_INV_PARAM
;
3421 return SCTP_ERROR_INV_PARAM
;
3425 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3426 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3427 asconf_ack_len
-= length
;
3433 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3434 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3435 struct sctp_chunk
*asconf_ack
)
3437 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3438 union sctp_addr_param
*addr_param
;
3439 sctp_addip_param_t
*asconf_param
;
3441 int asconf_len
= asconf
->skb
->len
;
3442 int all_param_pass
= 0;
3445 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3447 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3448 * a pointer to address parameter.
3450 length
= sizeof(sctp_addip_chunk_t
);
3451 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3452 asconf_len
-= length
;
3454 /* Skip the address parameter in the last asconf sent and store a
3455 * pointer to the first asconf parameter.
3457 length
= ntohs(addr_param
->p
.length
);
3458 asconf_param
= (void *)addr_param
+ length
;
3459 asconf_len
-= length
;
3462 * A8) If there is no response(s) to specific TLV parameter(s), and no
3463 * failures are indicated, then all request(s) are considered
3466 if (asconf_ack
->skb
->len
== sizeof(sctp_addiphdr_t
))
3469 /* Process the TLVs contained in the last sent ASCONF chunk. */
3470 while (asconf_len
> 0) {
3472 err_code
= SCTP_ERROR_NO_ERROR
;
3474 err_code
= sctp_get_asconf_response(asconf_ack
,
3477 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3482 case SCTP_ERROR_NO_ERROR
:
3483 sctp_asconf_param_success(asoc
, asconf_param
);
3486 case SCTP_ERROR_RSRC_LOW
:
3490 case SCTP_ERROR_UNKNOWN_PARAM
:
3491 /* Disable sending this type of asconf parameter in
3494 asoc
->peer
.addip_disabled_mask
|=
3495 asconf_param
->param_hdr
.type
;
3498 case SCTP_ERROR_REQ_REFUSED
:
3499 case SCTP_ERROR_DEL_LAST_IP
:
3500 case SCTP_ERROR_DEL_SRC_IP
:
3505 /* Skip the processed asconf parameter and move to the next
3508 length
= ntohs(asconf_param
->param_hdr
.length
);
3509 asconf_param
= (void *)asconf_param
+ length
;
3510 asconf_len
-= length
;
3513 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3514 asoc
->src_out_of_asoc_ok
= 0;
3515 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3518 /* Free the cached last sent asconf chunk. */
3519 list_del_init(&asconf
->transmitted_list
);
3520 sctp_chunk_free(asconf
);
3521 asoc
->addip_last_asconf
= NULL
;
3526 /* Make a FWD TSN chunk. */
3527 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3528 __u32 new_cum_tsn
, size_t nstreams
,
3529 struct sctp_fwdtsn_skip
*skiplist
)
3531 struct sctp_chunk
*retval
= NULL
;
3532 struct sctp_fwdtsn_hdr ftsn_hdr
;
3533 struct sctp_fwdtsn_skip skip
;
3537 hint
= (nstreams
+ 1) * sizeof(__u32
);
3539 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3544 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3545 retval
->subh
.fwdtsn_hdr
=
3546 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3548 for (i
= 0; i
< nstreams
; i
++) {
3549 skip
.stream
= skiplist
[i
].stream
;
3550 skip
.ssn
= skiplist
[i
].ssn
;
3551 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);