1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2002 Intel Corp.
8 * This file is part of the SCTP kernel implementation
10 * These functions work with the state functions in sctp_sm_statefuns.c
11 * to implement the state operations. These functions implement the
12 * steps which require modifying existing data structures.
14 * Please send any bug reports or fixes you make to the
16 * lksctp developers <linux-sctp@vger.kernel.org>
18 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * C. Robin <chris@hundredacre.ac.uk>
22 * Jon Grimm <jgrimm@us.ibm.com>
23 * Xingang Guo <xingang.guo@intel.com>
24 * Dajiang Zhang <dajiang.zhang@nokia.com>
25 * Sridhar Samudrala <sri@us.ibm.com>
26 * Daisy Chang <daisyc@us.ibm.com>
27 * Ardelle Fan <ardelle.fan@intel.com>
28 * Kevin Gao <kevin.gao@intel.com>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <crypto/hash.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
37 #include <linux/ipv6.h>
38 #include <linux/net.h>
39 #include <linux/inet.h>
40 #include <linux/scatterlist.h>
41 #include <linux/slab.h>
44 #include <linux/skbuff.h>
45 #include <linux/random.h> /* for get_random_bytes */
46 #include <net/sctp/sctp.h>
47 #include <net/sctp/sm.h>
49 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
50 __u8 type
, __u8 flags
, int paylen
,
52 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
53 __u8 flags
, int paylen
, gfp_t gfp
);
54 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
55 __u8 type
, __u8 flags
, int paylen
,
57 static struct sctp_cookie_param
*sctp_pack_cookie(
58 const struct sctp_endpoint
*ep
,
59 const struct sctp_association
*asoc
,
60 const struct sctp_chunk
*init_chunk
,
62 const __u8
*raw_addrs
, int addrs_len
);
63 static int sctp_process_param(struct sctp_association
*asoc
,
64 union sctp_params param
,
65 const union sctp_addr
*peer_addr
,
67 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
70 /* Control chunk destructor */
71 static void sctp_control_release_owner(struct sk_buff
*skb
)
73 struct sctp_chunk
*chunk
= skb_shinfo(skb
)->destructor_arg
;
76 struct sctp_shared_key
*shkey
= chunk
->shkey
;
77 struct sctp_association
*asoc
= chunk
->asoc
;
79 /* refcnt == 2 and !list_empty mean after this release, it's
80 * not being used anywhere, and it's time to notify userland
81 * that this shkey can be freed if it's been deactivated.
83 if (shkey
->deactivated
&& !list_empty(&shkey
->key_list
) &&
84 refcount_read(&shkey
->refcnt
) == 2) {
85 struct sctp_ulpevent
*ev
;
87 ev
= sctp_ulpevent_make_authkey(asoc
, shkey
->key_id
,
91 asoc
->stream
.si
->enqueue_event(&asoc
->ulpq
, ev
);
93 sctp_auth_shkey_release(chunk
->shkey
);
97 static void sctp_control_set_owner_w(struct sctp_chunk
*chunk
)
99 struct sctp_association
*asoc
= chunk
->asoc
;
100 struct sk_buff
*skb
= chunk
->skb
;
102 /* TODO: properly account for control chunks.
103 * To do it right we'll need:
104 * 1) endpoint if association isn't known.
105 * 2) proper memory accounting.
107 * For now don't do anything for now.
110 chunk
->shkey
= asoc
->shkey
;
111 sctp_auth_shkey_hold(chunk
->shkey
);
113 skb
->sk
= asoc
? asoc
->base
.sk
: NULL
;
114 skb_shinfo(skb
)->destructor_arg
= chunk
;
115 skb
->destructor
= sctp_control_release_owner
;
118 /* What was the inbound interface for this chunk? */
119 int sctp_chunk_iif(const struct sctp_chunk
*chunk
)
121 struct sk_buff
*skb
= chunk
->skb
;
123 return SCTP_INPUT_CB(skb
)->af
->skb_iif(skb
);
126 /* RFC 2960 3.3.2 Initiation (INIT) (1)
128 * Note 2: The ECN capable field is reserved for future use of
129 * Explicit Congestion Notification.
131 static const struct sctp_paramhdr ecap_param
= {
132 SCTP_PARAM_ECN_CAPABLE
,
133 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
135 static const struct sctp_paramhdr prsctp_param
= {
136 SCTP_PARAM_FWD_TSN_SUPPORT
,
137 cpu_to_be16(sizeof(struct sctp_paramhdr
)),
140 /* A helper to initialize an op error inside a provided chunk, as most
141 * cause codes will be embedded inside an abort chunk.
143 int sctp_init_cause(struct sctp_chunk
*chunk
, __be16 cause_code
,
146 struct sctp_errhdr err
;
149 /* Cause code constants are now defined in network order. */
150 err
.cause
= cause_code
;
151 len
= sizeof(err
) + paylen
;
152 err
.length
= htons(len
);
154 if (skb_tailroom(chunk
->skb
) < len
)
157 chunk
->subh
.err_hdr
= sctp_addto_chunk(chunk
, sizeof(err
), &err
);
162 /* 3.3.2 Initiation (INIT) (1)
164 * This chunk is used to initiate a SCTP association between two
165 * endpoints. The format of the INIT chunk is shown below:
168 * 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
169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * | Type = 1 | Chunk Flags | Chunk Length |
171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 * | Advertised Receiver Window Credit (a_rwnd) |
175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
176 * | Number of Outbound Streams | Number of Inbound Streams |
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * / Optional/Variable-Length Parameters /
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
186 * The INIT chunk contains the following parameters. Unless otherwise
187 * noted, each parameter MUST only be included once in the INIT chunk.
189 * Fixed Parameters Status
190 * ----------------------------------------------
191 * Initiate Tag Mandatory
192 * Advertised Receiver Window Credit Mandatory
193 * Number of Outbound Streams Mandatory
194 * Number of Inbound Streams Mandatory
195 * Initial TSN Mandatory
197 * Variable Parameters Status Type Value
198 * -------------------------------------------------------------
199 * IPv4 Address (Note 1) Optional 5
200 * IPv6 Address (Note 1) Optional 6
201 * Cookie Preservative Optional 9
202 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
203 * Host Name Address (Note 3) Optional 11
204 * Supported Address Types (Note 4) Optional 12
206 struct sctp_chunk
*sctp_make_init(const struct sctp_association
*asoc
,
207 const struct sctp_bind_addr
*bp
,
208 gfp_t gfp
, int vparam_len
)
210 struct sctp_supported_ext_param ext_param
;
211 struct sctp_adaptation_ind_param aiparam
;
212 struct sctp_paramhdr
*auth_chunks
= NULL
;
213 struct sctp_paramhdr
*auth_hmacs
= NULL
;
214 struct sctp_supported_addrs_param sat
;
215 struct sctp_endpoint
*ep
= asoc
->ep
;
216 struct sctp_chunk
*retval
= NULL
;
217 int num_types
, addrs_len
= 0;
218 struct sctp_inithdr init
;
219 union sctp_params addrs
;
220 struct sctp_sock
*sp
;
226 /* RFC 2960 3.3.2 Initiation (INIT) (1)
228 * Note 1: The INIT chunks can contain multiple addresses that
229 * can be IPv4 and/or IPv6 in any combination.
232 /* Convert the provided bind address list to raw format. */
233 addrs
= sctp_bind_addrs_to_raw(bp
, &addrs_len
, gfp
);
235 init
.init_tag
= htonl(asoc
->c
.my_vtag
);
236 init
.a_rwnd
= htonl(asoc
->rwnd
);
237 init
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
238 init
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
239 init
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
241 /* How many address types are needed? */
242 sp
= sctp_sk(asoc
->base
.sk
);
243 num_types
= sp
->pf
->supported_addrs(sp
, types
);
245 chunksize
= sizeof(init
) + addrs_len
;
246 chunksize
+= SCTP_PAD4(SCTP_SAT_LEN(num_types
));
248 if (asoc
->ep
->ecn_enable
)
249 chunksize
+= sizeof(ecap_param
);
251 if (asoc
->ep
->prsctp_enable
)
252 chunksize
+= sizeof(prsctp_param
);
254 /* ADDIP: Section 4.2.7:
255 * An implementation supporting this extension [ADDIP] MUST list
256 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
257 * INIT-ACK parameters.
259 if (asoc
->ep
->asconf_enable
) {
260 extensions
[num_ext
] = SCTP_CID_ASCONF
;
261 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
265 if (asoc
->ep
->reconf_enable
) {
266 extensions
[num_ext
] = SCTP_CID_RECONF
;
270 if (sp
->adaptation_ind
)
271 chunksize
+= sizeof(aiparam
);
273 if (asoc
->ep
->intl_enable
) {
274 extensions
[num_ext
] = SCTP_CID_I_DATA
;
278 chunksize
+= vparam_len
;
280 /* Account for AUTH related parameters */
281 if (ep
->auth_enable
) {
282 /* Add random parameter length*/
283 chunksize
+= sizeof(asoc
->c
.auth_random
);
285 /* Add HMACS parameter length if any were defined */
286 auth_hmacs
= (struct sctp_paramhdr
*)asoc
->c
.auth_hmacs
;
287 if (auth_hmacs
->length
)
288 chunksize
+= SCTP_PAD4(ntohs(auth_hmacs
->length
));
292 /* Add CHUNKS parameter length */
293 auth_chunks
= (struct sctp_paramhdr
*)asoc
->c
.auth_chunks
;
294 if (auth_chunks
->length
)
295 chunksize
+= SCTP_PAD4(ntohs(auth_chunks
->length
));
299 extensions
[num_ext
] = SCTP_CID_AUTH
;
303 /* If we have any extensions to report, account for that */
305 chunksize
+= SCTP_PAD4(sizeof(ext_param
) + num_ext
);
307 /* RFC 2960 3.3.2 Initiation (INIT) (1)
309 * Note 3: An INIT chunk MUST NOT contain more than one Host
310 * Name address parameter. Moreover, the sender of the INIT
311 * MUST NOT combine any other address types with the Host Name
312 * address in the INIT. The receiver of INIT MUST ignore any
313 * other address types if the Host Name address parameter is
314 * present in the received INIT chunk.
316 * PLEASE DO NOT FIXME [This version does not support Host Name.]
319 retval
= sctp_make_control(asoc
, SCTP_CID_INIT
, 0, chunksize
, gfp
);
323 retval
->subh
.init_hdr
=
324 sctp_addto_chunk(retval
, sizeof(init
), &init
);
325 retval
->param_hdr
.v
=
326 sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
328 /* RFC 2960 3.3.2 Initiation (INIT) (1)
330 * Note 4: This parameter, when present, specifies all the
331 * address types the sending endpoint can support. The absence
332 * of this parameter indicates that the sending endpoint can
333 * support any address type.
335 sat
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
;
336 sat
.param_hdr
.length
= htons(SCTP_SAT_LEN(num_types
));
337 sctp_addto_chunk(retval
, sizeof(sat
), &sat
);
338 sctp_addto_chunk(retval
, num_types
* sizeof(__u16
), &types
);
340 if (asoc
->ep
->ecn_enable
)
341 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
343 /* Add the supported extensions parameter. Be nice and add this
344 * fist before addiding the parameters for the extensions themselves
347 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
348 ext_param
.param_hdr
.length
= htons(sizeof(ext_param
) + num_ext
);
349 sctp_addto_chunk(retval
, sizeof(ext_param
), &ext_param
);
350 sctp_addto_param(retval
, num_ext
, extensions
);
353 if (asoc
->ep
->prsctp_enable
)
354 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
356 if (sp
->adaptation_ind
) {
357 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
358 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
359 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
360 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
363 /* Add SCTP-AUTH chunks to the parameter list */
364 if (ep
->auth_enable
) {
365 sctp_addto_chunk(retval
, sizeof(asoc
->c
.auth_random
),
366 asoc
->c
.auth_random
);
368 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
371 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
379 struct sctp_chunk
*sctp_make_init_ack(const struct sctp_association
*asoc
,
380 const struct sctp_chunk
*chunk
,
381 gfp_t gfp
, int unkparam_len
)
383 struct sctp_supported_ext_param ext_param
;
384 struct sctp_adaptation_ind_param aiparam
;
385 struct sctp_paramhdr
*auth_chunks
= NULL
;
386 struct sctp_paramhdr
*auth_random
= NULL
;
387 struct sctp_paramhdr
*auth_hmacs
= NULL
;
388 struct sctp_chunk
*retval
= NULL
;
389 struct sctp_cookie_param
*cookie
;
390 struct sctp_inithdr initack
;
391 union sctp_params addrs
;
392 struct sctp_sock
*sp
;
399 /* Note: there may be no addresses to embed. */
400 addrs
= sctp_bind_addrs_to_raw(&asoc
->base
.bind_addr
, &addrs_len
, gfp
);
402 initack
.init_tag
= htonl(asoc
->c
.my_vtag
);
403 initack
.a_rwnd
= htonl(asoc
->rwnd
);
404 initack
.num_outbound_streams
= htons(asoc
->c
.sinit_num_ostreams
);
405 initack
.num_inbound_streams
= htons(asoc
->c
.sinit_max_instreams
);
406 initack
.initial_tsn
= htonl(asoc
->c
.initial_tsn
);
408 /* FIXME: We really ought to build the cookie right
409 * into the packet instead of allocating more fresh memory.
411 cookie
= sctp_pack_cookie(asoc
->ep
, asoc
, chunk
, &cookie_len
,
416 /* Calculate the total size of allocation, include the reserved
417 * space for reporting unknown parameters if it is specified.
419 sp
= sctp_sk(asoc
->base
.sk
);
420 chunksize
= sizeof(initack
) + addrs_len
+ cookie_len
+ unkparam_len
;
422 /* Tell peer that we'll do ECN only if peer advertised such cap. */
423 if (asoc
->peer
.ecn_capable
)
424 chunksize
+= sizeof(ecap_param
);
426 if (asoc
->peer
.prsctp_capable
)
427 chunksize
+= sizeof(prsctp_param
);
429 if (asoc
->peer
.asconf_capable
) {
430 extensions
[num_ext
] = SCTP_CID_ASCONF
;
431 extensions
[num_ext
+1] = SCTP_CID_ASCONF_ACK
;
435 if (asoc
->peer
.reconf_capable
) {
436 extensions
[num_ext
] = SCTP_CID_RECONF
;
440 if (sp
->adaptation_ind
)
441 chunksize
+= sizeof(aiparam
);
443 if (asoc
->peer
.intl_capable
) {
444 extensions
[num_ext
] = SCTP_CID_I_DATA
;
448 if (asoc
->peer
.auth_capable
) {
449 auth_random
= (struct sctp_paramhdr
*)asoc
->c
.auth_random
;
450 chunksize
+= ntohs(auth_random
->length
);
452 auth_hmacs
= (struct sctp_paramhdr
*)asoc
->c
.auth_hmacs
;
453 if (auth_hmacs
->length
)
454 chunksize
+= SCTP_PAD4(ntohs(auth_hmacs
->length
));
458 auth_chunks
= (struct sctp_paramhdr
*)asoc
->c
.auth_chunks
;
459 if (auth_chunks
->length
)
460 chunksize
+= SCTP_PAD4(ntohs(auth_chunks
->length
));
464 extensions
[num_ext
] = SCTP_CID_AUTH
;
469 chunksize
+= SCTP_PAD4(sizeof(ext_param
) + num_ext
);
471 /* Now allocate and fill out the chunk. */
472 retval
= sctp_make_control(asoc
, SCTP_CID_INIT_ACK
, 0, chunksize
, gfp
);
476 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
478 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
479 * HEARTBEAT ACK, * etc.) to the same destination transport
480 * address from which it received the DATA or control chunk
481 * to which it is replying.
483 * [INIT ACK back to where the INIT came from.]
485 if (chunk
->transport
)
487 sctp_assoc_lookup_paddr(asoc
,
488 &chunk
->transport
->ipaddr
);
490 retval
->subh
.init_hdr
=
491 sctp_addto_chunk(retval
, sizeof(initack
), &initack
);
492 retval
->param_hdr
.v
= sctp_addto_chunk(retval
, addrs_len
, addrs
.v
);
493 sctp_addto_chunk(retval
, cookie_len
, cookie
);
494 if (asoc
->peer
.ecn_capable
)
495 sctp_addto_chunk(retval
, sizeof(ecap_param
), &ecap_param
);
497 ext_param
.param_hdr
.type
= SCTP_PARAM_SUPPORTED_EXT
;
498 ext_param
.param_hdr
.length
= htons(sizeof(ext_param
) + num_ext
);
499 sctp_addto_chunk(retval
, sizeof(ext_param
), &ext_param
);
500 sctp_addto_param(retval
, num_ext
, extensions
);
502 if (asoc
->peer
.prsctp_capable
)
503 sctp_addto_chunk(retval
, sizeof(prsctp_param
), &prsctp_param
);
505 if (sp
->adaptation_ind
) {
506 aiparam
.param_hdr
.type
= SCTP_PARAM_ADAPTATION_LAYER_IND
;
507 aiparam
.param_hdr
.length
= htons(sizeof(aiparam
));
508 aiparam
.adaptation_ind
= htonl(sp
->adaptation_ind
);
509 sctp_addto_chunk(retval
, sizeof(aiparam
), &aiparam
);
512 if (asoc
->peer
.auth_capable
) {
513 sctp_addto_chunk(retval
, ntohs(auth_random
->length
),
516 sctp_addto_chunk(retval
, ntohs(auth_hmacs
->length
),
519 sctp_addto_chunk(retval
, ntohs(auth_chunks
->length
),
523 /* We need to remove the const qualifier at this point. */
524 retval
->asoc
= (struct sctp_association
*) asoc
;
533 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
535 * This chunk is used only during the initialization of an association.
536 * It is sent by the initiator of an association to its peer to complete
537 * the initialization process. This chunk MUST precede any DATA chunk
538 * sent within the association, but MAY be bundled with one or more DATA
539 * chunks in the same packet.
542 * 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
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Type = 10 |Chunk Flags | Length |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * Set to zero on transmit and ignored on receipt.
554 * Length: 16 bits (unsigned integer)
556 * Set to the size of the chunk in bytes, including the 4 bytes of
557 * the chunk header and the size of the Cookie.
559 * Cookie: variable size
561 * This field must contain the exact cookie received in the
562 * State Cookie parameter from the previous INIT ACK.
564 * An implementation SHOULD make the cookie as small as possible
565 * to insure interoperability.
567 struct sctp_chunk
*sctp_make_cookie_echo(const struct sctp_association
*asoc
,
568 const struct sctp_chunk
*chunk
)
570 struct sctp_chunk
*retval
;
574 cookie
= asoc
->peer
.cookie
;
575 cookie_len
= asoc
->peer
.cookie_len
;
577 /* Build a cookie echo chunk. */
578 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ECHO
, 0,
579 cookie_len
, GFP_ATOMIC
);
582 retval
->subh
.cookie_hdr
=
583 sctp_addto_chunk(retval
, cookie_len
, cookie
);
585 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
587 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
588 * HEARTBEAT ACK, * etc.) to the same destination transport
589 * address from which it * received the DATA or control chunk
590 * to which it is replying.
592 * [COOKIE ECHO back to where the INIT ACK came from.]
595 retval
->transport
= chunk
->transport
;
601 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
603 * This chunk is used only during the initialization of an
604 * association. It is used to acknowledge the receipt of a COOKIE
605 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
606 * within the association, but MAY be bundled with one or more DATA
607 * chunks or SACK chunk in the same SCTP packet.
610 * 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
611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * | Type = 11 |Chunk Flags | Length = 4 |
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
615 * Chunk Flags: 8 bits
617 * Set to zero on transmit and ignored on receipt.
619 struct sctp_chunk
*sctp_make_cookie_ack(const struct sctp_association
*asoc
,
620 const struct sctp_chunk
*chunk
)
622 struct sctp_chunk
*retval
;
624 retval
= sctp_make_control(asoc
, SCTP_CID_COOKIE_ACK
, 0, 0, GFP_ATOMIC
);
626 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
628 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
629 * HEARTBEAT ACK, * etc.) to the same destination transport
630 * address from which it * received the DATA or control chunk
631 * to which it is replying.
633 * [COOKIE ACK back to where the COOKIE ECHO came from.]
635 if (retval
&& chunk
&& chunk
->transport
)
637 sctp_assoc_lookup_paddr(asoc
,
638 &chunk
->transport
->ipaddr
);
644 * Appendix A: Explicit Congestion Notification:
647 * RFC 2481 details a specific bit for a sender to send in the header of
648 * its next outbound TCP segment to indicate to its peer that it has
649 * reduced its congestion window. This is termed the CWR bit. For
650 * SCTP the same indication is made by including the CWR chunk.
651 * This chunk contains one data element, i.e. the TSN number that
652 * was sent in the ECNE chunk. This element represents the lowest
653 * TSN number in the datagram that was originally marked with the
657 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661 * | Lowest TSN Number |
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664 * Note: The CWR is considered a Control chunk.
666 struct sctp_chunk
*sctp_make_cwr(const struct sctp_association
*asoc
,
667 const __u32 lowest_tsn
,
668 const struct sctp_chunk
*chunk
)
670 struct sctp_chunk
*retval
;
671 struct sctp_cwrhdr cwr
;
673 cwr
.lowest_tsn
= htonl(lowest_tsn
);
674 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_CWR
, 0,
675 sizeof(cwr
), GFP_ATOMIC
);
680 retval
->subh
.ecn_cwr_hdr
=
681 sctp_addto_chunk(retval
, sizeof(cwr
), &cwr
);
683 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
685 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
686 * HEARTBEAT ACK, * etc.) to the same destination transport
687 * address from which it * received the DATA or control chunk
688 * to which it is replying.
690 * [Report a reduced congestion window back to where the ECNE
694 retval
->transport
= chunk
->transport
;
700 /* Make an ECNE chunk. This is a congestion experienced report. */
701 struct sctp_chunk
*sctp_make_ecne(const struct sctp_association
*asoc
,
702 const __u32 lowest_tsn
)
704 struct sctp_chunk
*retval
;
705 struct sctp_ecnehdr ecne
;
707 ecne
.lowest_tsn
= htonl(lowest_tsn
);
708 retval
= sctp_make_control(asoc
, SCTP_CID_ECN_ECNE
, 0,
709 sizeof(ecne
), GFP_ATOMIC
);
712 retval
->subh
.ecne_hdr
=
713 sctp_addto_chunk(retval
, sizeof(ecne
), &ecne
);
719 /* Make a DATA chunk for the given association from the provided
720 * parameters. However, do not populate the data payload.
722 struct sctp_chunk
*sctp_make_datafrag_empty(const struct sctp_association
*asoc
,
723 const struct sctp_sndrcvinfo
*sinfo
,
724 int len
, __u8 flags
, gfp_t gfp
)
726 struct sctp_chunk
*retval
;
727 struct sctp_datahdr dp
;
729 /* We assign the TSN as LATE as possible, not here when
730 * creating the chunk.
732 memset(&dp
, 0, sizeof(dp
));
733 dp
.ppid
= sinfo
->sinfo_ppid
;
734 dp
.stream
= htons(sinfo
->sinfo_stream
);
736 /* Set the flags for an unordered send. */
737 if (sinfo
->sinfo_flags
& SCTP_UNORDERED
)
738 flags
|= SCTP_DATA_UNORDERED
;
740 retval
= sctp_make_data(asoc
, flags
, sizeof(dp
) + len
, gfp
);
744 retval
->subh
.data_hdr
= sctp_addto_chunk(retval
, sizeof(dp
), &dp
);
745 memcpy(&retval
->sinfo
, sinfo
, sizeof(struct sctp_sndrcvinfo
));
750 /* Create a selective ackowledgement (SACK) for the given
751 * association. This reports on which TSN's we've seen to date,
752 * including duplicates and gaps.
754 struct sctp_chunk
*sctp_make_sack(struct sctp_association
*asoc
)
756 struct sctp_tsnmap
*map
= (struct sctp_tsnmap
*)&asoc
->peer
.tsn_map
;
757 struct sctp_gap_ack_block gabs
[SCTP_MAX_GABS
];
758 __u16 num_gabs
, num_dup_tsns
;
759 struct sctp_transport
*trans
;
760 struct sctp_chunk
*retval
;
761 struct sctp_sackhdr sack
;
765 memset(gabs
, 0, sizeof(gabs
));
766 ctsn
= sctp_tsnmap_get_ctsn(map
);
768 pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__
, ctsn
);
770 /* How much room is needed in the chunk? */
771 num_gabs
= sctp_tsnmap_num_gabs(map
, gabs
);
772 num_dup_tsns
= sctp_tsnmap_num_dups(map
);
774 /* Initialize the SACK header. */
775 sack
.cum_tsn_ack
= htonl(ctsn
);
776 sack
.a_rwnd
= htonl(asoc
->a_rwnd
);
777 sack
.num_gap_ack_blocks
= htons(num_gabs
);
778 sack
.num_dup_tsns
= htons(num_dup_tsns
);
781 + sizeof(struct sctp_gap_ack_block
) * num_gabs
782 + sizeof(__u32
) * num_dup_tsns
;
784 /* Create the chunk. */
785 retval
= sctp_make_control(asoc
, SCTP_CID_SACK
, 0, len
, GFP_ATOMIC
);
789 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
791 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
792 * HEARTBEAT ACK, etc.) to the same destination transport
793 * address from which it received the DATA or control chunk to
794 * which it is replying. This rule should also be followed if
795 * the endpoint is bundling DATA chunks together with the
798 * However, when acknowledging multiple DATA chunks received
799 * in packets from different source addresses in a single
800 * SACK, the SACK chunk may be transmitted to one of the
801 * destination transport addresses from which the DATA or
802 * control chunks being acknowledged were received.
804 * [BUG: We do not implement the following paragraph.
805 * Perhaps we should remember the last transport we used for a
806 * SACK and avoid that (if possible) if we have seen any
807 * duplicates. --piggy]
809 * When a receiver of a duplicate DATA chunk sends a SACK to a
810 * multi- homed endpoint it MAY be beneficial to vary the
811 * destination address and not use the source address of the
812 * DATA chunk. The reason being that receiving a duplicate
813 * from a multi-homed endpoint might indicate that the return
814 * path (as specified in the source address of the DATA chunk)
815 * for the SACK is broken.
817 * [Send to the address from which we last received a DATA chunk.]
819 retval
->transport
= asoc
->peer
.last_data_from
;
821 retval
->subh
.sack_hdr
=
822 sctp_addto_chunk(retval
, sizeof(sack
), &sack
);
824 /* Add the gap ack block information. */
826 sctp_addto_chunk(retval
, sizeof(__u32
) * num_gabs
,
829 /* Add the duplicate TSN information. */
831 asoc
->stats
.idupchunks
+= num_dup_tsns
;
832 sctp_addto_chunk(retval
, sizeof(__u32
) * num_dup_tsns
,
833 sctp_tsnmap_get_dups(map
));
835 /* Once we have a sack generated, check to see what our sack
836 * generation is, if its 0, reset the transports to 0, and reset
837 * the association generation to 1
839 * The idea is that zero is never used as a valid generation for the
840 * association so no transport will match after a wrap event like this,
841 * Until the next sack
843 if (++asoc
->peer
.sack_generation
== 0) {
844 list_for_each_entry(trans
, &asoc
->peer
.transport_addr_list
,
846 trans
->sack_generation
= 0;
847 asoc
->peer
.sack_generation
= 1;
853 /* Make a SHUTDOWN chunk. */
854 struct sctp_chunk
*sctp_make_shutdown(const struct sctp_association
*asoc
,
855 const struct sctp_chunk
*chunk
)
857 struct sctp_shutdownhdr shut
;
858 struct sctp_chunk
*retval
;
861 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
862 shut
.cum_tsn_ack
= htonl(ctsn
);
864 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN
, 0,
865 sizeof(shut
), GFP_ATOMIC
);
869 retval
->subh
.shutdown_hdr
=
870 sctp_addto_chunk(retval
, sizeof(shut
), &shut
);
873 retval
->transport
= chunk
->transport
;
878 struct sctp_chunk
*sctp_make_shutdown_ack(const struct sctp_association
*asoc
,
879 const struct sctp_chunk
*chunk
)
881 struct sctp_chunk
*retval
;
883 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_ACK
, 0, 0,
886 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
888 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
889 * HEARTBEAT ACK, * etc.) to the same destination transport
890 * address from which it * received the DATA or control chunk
891 * to which it is replying.
893 * [ACK back to where the SHUTDOWN came from.]
896 retval
->transport
= chunk
->transport
;
901 struct sctp_chunk
*sctp_make_shutdown_complete(
902 const struct sctp_association
*asoc
,
903 const struct sctp_chunk
*chunk
)
905 struct sctp_chunk
*retval
;
908 /* Set the T-bit if we have no association (vtag will be
911 flags
|= asoc
? 0 : SCTP_CHUNK_FLAG_T
;
913 retval
= sctp_make_control(asoc
, SCTP_CID_SHUTDOWN_COMPLETE
, flags
,
916 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
918 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
919 * HEARTBEAT ACK, * etc.) to the same destination transport
920 * address from which it * received the DATA or control chunk
921 * to which it is replying.
923 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
927 retval
->transport
= chunk
->transport
;
932 /* Create an ABORT. Note that we set the T bit if we have no
933 * association, except when responding to an INIT (sctpimpguide 2.41).
935 struct sctp_chunk
*sctp_make_abort(const struct sctp_association
*asoc
,
936 const struct sctp_chunk
*chunk
,
939 struct sctp_chunk
*retval
;
942 /* Set the T-bit if we have no association and 'chunk' is not
943 * an INIT (vtag will be reflected).
946 if (chunk
&& chunk
->chunk_hdr
&&
947 chunk
->chunk_hdr
->type
== SCTP_CID_INIT
)
950 flags
= SCTP_CHUNK_FLAG_T
;
953 retval
= sctp_make_control(asoc
, SCTP_CID_ABORT
, flags
, hint
,
956 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
958 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
959 * HEARTBEAT ACK, * etc.) to the same destination transport
960 * address from which it * received the DATA or control chunk
961 * to which it is replying.
963 * [ABORT back to where the offender came from.]
966 retval
->transport
= chunk
->transport
;
971 /* Helper to create ABORT with a NO_USER_DATA error. */
972 struct sctp_chunk
*sctp_make_abort_no_data(
973 const struct sctp_association
*asoc
,
974 const struct sctp_chunk
*chunk
,
977 struct sctp_chunk
*retval
;
980 retval
= sctp_make_abort(asoc
, chunk
,
981 sizeof(struct sctp_errhdr
) + sizeof(tsn
));
986 /* Put the tsn back into network byte order. */
987 payload
= htonl(tsn
);
988 sctp_init_cause(retval
, SCTP_ERROR_NO_DATA
, sizeof(payload
));
989 sctp_addto_chunk(retval
, sizeof(payload
), (const void *)&payload
);
991 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
993 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
994 * HEARTBEAT ACK, * etc.) to the same destination transport
995 * address from which it * received the DATA or control chunk
996 * to which it is replying.
998 * [ABORT back to where the offender came from.]
1001 retval
->transport
= chunk
->transport
;
1007 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
1008 struct sctp_chunk
*sctp_make_abort_user(const struct sctp_association
*asoc
,
1012 struct sctp_chunk
*retval
;
1013 void *payload
= NULL
;
1016 retval
= sctp_make_abort(asoc
, NULL
,
1017 sizeof(struct sctp_errhdr
) + paylen
);
1022 /* Put the msg_iov together into payload. */
1023 payload
= kmalloc(paylen
, GFP_KERNEL
);
1027 err
= memcpy_from_msg(payload
, msg
, paylen
);
1032 sctp_init_cause(retval
, SCTP_ERROR_USER_ABORT
, paylen
);
1033 sctp_addto_chunk(retval
, paylen
, payload
);
1043 sctp_chunk_free(retval
);
1049 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1052 static void *sctp_addto_param(struct sctp_chunk
*chunk
, int len
,
1055 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1058 target
= skb_put(chunk
->skb
, len
);
1061 memcpy(target
, data
, len
);
1063 memset(target
, 0, len
);
1065 /* Adjust the chunk length field. */
1066 chunk
->chunk_hdr
->length
= htons(chunklen
+ len
);
1067 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1072 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1073 struct sctp_chunk
*sctp_make_abort_violation(
1074 const struct sctp_association
*asoc
,
1075 const struct sctp_chunk
*chunk
,
1076 const __u8
*payload
,
1077 const size_t paylen
)
1079 struct sctp_chunk
*retval
;
1080 struct sctp_paramhdr phdr
;
1082 retval
= sctp_make_abort(asoc
, chunk
, sizeof(struct sctp_errhdr
) +
1083 paylen
+ sizeof(phdr
));
1087 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, paylen
+
1090 phdr
.type
= htons(chunk
->chunk_hdr
->type
);
1091 phdr
.length
= chunk
->chunk_hdr
->length
;
1092 sctp_addto_chunk(retval
, paylen
, payload
);
1093 sctp_addto_param(retval
, sizeof(phdr
), &phdr
);
1099 struct sctp_chunk
*sctp_make_violation_paramlen(
1100 const struct sctp_association
*asoc
,
1101 const struct sctp_chunk
*chunk
,
1102 struct sctp_paramhdr
*param
)
1104 static const char error
[] = "The following parameter had invalid length:";
1105 size_t payload_len
= sizeof(error
) + sizeof(struct sctp_errhdr
) +
1107 struct sctp_chunk
*retval
;
1109 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1113 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
,
1114 sizeof(error
) + sizeof(*param
));
1115 sctp_addto_chunk(retval
, sizeof(error
), error
);
1116 sctp_addto_param(retval
, sizeof(*param
), param
);
1122 struct sctp_chunk
*sctp_make_violation_max_retrans(
1123 const struct sctp_association
*asoc
,
1124 const struct sctp_chunk
*chunk
)
1126 static const char error
[] = "Association exceeded its max_retrans count";
1127 size_t payload_len
= sizeof(error
) + sizeof(struct sctp_errhdr
);
1128 struct sctp_chunk
*retval
;
1130 retval
= sctp_make_abort(asoc
, chunk
, payload_len
);
1134 sctp_init_cause(retval
, SCTP_ERROR_PROTO_VIOLATION
, sizeof(error
));
1135 sctp_addto_chunk(retval
, sizeof(error
), error
);
1141 /* Make a HEARTBEAT chunk. */
1142 struct sctp_chunk
*sctp_make_heartbeat(const struct sctp_association
*asoc
,
1143 const struct sctp_transport
*transport
)
1145 struct sctp_sender_hb_info hbinfo
;
1146 struct sctp_chunk
*retval
;
1148 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT
, 0,
1149 sizeof(hbinfo
), GFP_ATOMIC
);
1154 hbinfo
.param_hdr
.type
= SCTP_PARAM_HEARTBEAT_INFO
;
1155 hbinfo
.param_hdr
.length
= htons(sizeof(hbinfo
));
1156 hbinfo
.daddr
= transport
->ipaddr
;
1157 hbinfo
.sent_at
= jiffies
;
1158 hbinfo
.hb_nonce
= transport
->hb_nonce
;
1160 /* Cast away the 'const', as this is just telling the chunk
1161 * what transport it belongs to.
1163 retval
->transport
= (struct sctp_transport
*) transport
;
1164 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, sizeof(hbinfo
),
1171 struct sctp_chunk
*sctp_make_heartbeat_ack(const struct sctp_association
*asoc
,
1172 const struct sctp_chunk
*chunk
,
1173 const void *payload
,
1174 const size_t paylen
)
1176 struct sctp_chunk
*retval
;
1178 retval
= sctp_make_control(asoc
, SCTP_CID_HEARTBEAT_ACK
, 0, paylen
,
1183 retval
->subh
.hbs_hdr
= sctp_addto_chunk(retval
, paylen
, payload
);
1185 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1187 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1188 * HEARTBEAT ACK, * etc.) to the same destination transport
1189 * address from which it * received the DATA or control chunk
1190 * to which it is replying.
1192 * [HBACK back to where the HEARTBEAT came from.]
1195 retval
->transport
= chunk
->transport
;
1201 /* Create an Operation Error chunk with the specified space reserved.
1202 * This routine can be used for containing multiple causes in the chunk.
1204 static struct sctp_chunk
*sctp_make_op_error_space(
1205 const struct sctp_association
*asoc
,
1206 const struct sctp_chunk
*chunk
,
1209 struct sctp_chunk
*retval
;
1211 retval
= sctp_make_control(asoc
, SCTP_CID_ERROR
, 0,
1212 sizeof(struct sctp_errhdr
) + size
,
1217 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1219 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1220 * HEARTBEAT ACK, etc.) to the same destination transport
1221 * address from which it received the DATA or control chunk
1222 * to which it is replying.
1226 retval
->transport
= chunk
->transport
;
1232 /* Create an Operation Error chunk of a fixed size, specifically,
1233 * min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
1234 * This is a helper function to allocate an error chunk for for those
1235 * invalid parameter codes in which we may not want to report all the
1236 * errors, if the incoming chunk is large. If it can't fit in a single
1237 * packet, we ignore it.
1239 static inline struct sctp_chunk
*sctp_make_op_error_limited(
1240 const struct sctp_association
*asoc
,
1241 const struct sctp_chunk
*chunk
)
1243 size_t size
= SCTP_DEFAULT_MAXSEGMENT
;
1244 struct sctp_sock
*sp
= NULL
;
1247 size
= min_t(size_t, size
, asoc
->pathmtu
);
1248 sp
= sctp_sk(asoc
->base
.sk
);
1251 size
= sctp_mtu_payload(sp
, size
, sizeof(struct sctp_errhdr
));
1253 return sctp_make_op_error_space(asoc
, chunk
, size
);
1256 /* Create an Operation Error chunk. */
1257 struct sctp_chunk
*sctp_make_op_error(const struct sctp_association
*asoc
,
1258 const struct sctp_chunk
*chunk
,
1259 __be16 cause_code
, const void *payload
,
1260 size_t paylen
, size_t reserve_tail
)
1262 struct sctp_chunk
*retval
;
1264 retval
= sctp_make_op_error_space(asoc
, chunk
, paylen
+ reserve_tail
);
1268 sctp_init_cause(retval
, cause_code
, paylen
+ reserve_tail
);
1269 sctp_addto_chunk(retval
, paylen
, payload
);
1271 sctp_addto_param(retval
, reserve_tail
, NULL
);
1277 struct sctp_chunk
*sctp_make_auth(const struct sctp_association
*asoc
,
1280 struct sctp_authhdr auth_hdr
;
1281 struct sctp_hmac
*hmac_desc
;
1282 struct sctp_chunk
*retval
;
1284 /* Get the first hmac that the peer told us to use */
1285 hmac_desc
= sctp_auth_asoc_get_hmac(asoc
);
1286 if (unlikely(!hmac_desc
))
1289 retval
= sctp_make_control(asoc
, SCTP_CID_AUTH
, 0,
1290 hmac_desc
->hmac_len
+ sizeof(auth_hdr
),
1295 auth_hdr
.hmac_id
= htons(hmac_desc
->hmac_id
);
1296 auth_hdr
.shkey_id
= htons(key_id
);
1298 retval
->subh
.auth_hdr
= sctp_addto_chunk(retval
, sizeof(auth_hdr
),
1301 skb_put_zero(retval
->skb
, hmac_desc
->hmac_len
);
1303 /* Adjust the chunk header to include the empty MAC */
1304 retval
->chunk_hdr
->length
=
1305 htons(ntohs(retval
->chunk_hdr
->length
) + hmac_desc
->hmac_len
);
1306 retval
->chunk_end
= skb_tail_pointer(retval
->skb
);
1312 /********************************************************************
1313 * 2nd Level Abstractions
1314 ********************************************************************/
1316 /* Turn an skb into a chunk.
1317 * FIXME: Eventually move the structure directly inside the skb->cb[].
1319 * sctpimpguide-05.txt Section 2.8.2
1320 * M1) Each time a new DATA chunk is transmitted
1321 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1322 * 'TSN.Missing.Report' count will be used to determine missing chunks
1323 * and when to fast retransmit.
1326 struct sctp_chunk
*sctp_chunkify(struct sk_buff
*skb
,
1327 const struct sctp_association
*asoc
,
1328 struct sock
*sk
, gfp_t gfp
)
1330 struct sctp_chunk
*retval
;
1332 retval
= kmem_cache_zalloc(sctp_chunk_cachep
, gfp
);
1337 pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__
, skb
);
1339 INIT_LIST_HEAD(&retval
->list
);
1341 retval
->asoc
= (struct sctp_association
*)asoc
;
1342 retval
->singleton
= 1;
1344 retval
->fast_retransmit
= SCTP_CAN_FRTX
;
1346 /* Polish the bead hole. */
1347 INIT_LIST_HEAD(&retval
->transmitted_list
);
1348 INIT_LIST_HEAD(&retval
->frag_list
);
1349 SCTP_DBG_OBJCNT_INC(chunk
);
1350 refcount_set(&retval
->refcnt
, 1);
1356 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1357 void sctp_init_addrs(struct sctp_chunk
*chunk
, union sctp_addr
*src
,
1358 union sctp_addr
*dest
)
1360 memcpy(&chunk
->source
, src
, sizeof(union sctp_addr
));
1361 memcpy(&chunk
->dest
, dest
, sizeof(union sctp_addr
));
1364 /* Extract the source address from a chunk. */
1365 const union sctp_addr
*sctp_source(const struct sctp_chunk
*chunk
)
1367 /* If we have a known transport, use that. */
1368 if (chunk
->transport
) {
1369 return &chunk
->transport
->ipaddr
;
1371 /* Otherwise, extract it from the IP header. */
1372 return &chunk
->source
;
1376 /* Create a new chunk, setting the type and flags headers from the
1377 * arguments, reserving enough space for a 'paylen' byte payload.
1379 static struct sctp_chunk
*_sctp_make_chunk(const struct sctp_association
*asoc
,
1380 __u8 type
, __u8 flags
, int paylen
,
1383 struct sctp_chunkhdr
*chunk_hdr
;
1384 struct sctp_chunk
*retval
;
1385 struct sk_buff
*skb
;
1389 chunklen
= SCTP_PAD4(sizeof(*chunk_hdr
) + paylen
);
1390 if (chunklen
> SCTP_MAX_CHUNK_LEN
)
1393 /* No need to allocate LL here, as this is only a chunk. */
1394 skb
= alloc_skb(chunklen
, gfp
);
1398 /* Make room for the chunk header. */
1399 chunk_hdr
= (struct sctp_chunkhdr
*)skb_put(skb
, sizeof(*chunk_hdr
));
1400 chunk_hdr
->type
= type
;
1401 chunk_hdr
->flags
= flags
;
1402 chunk_hdr
->length
= htons(sizeof(*chunk_hdr
));
1404 sk
= asoc
? asoc
->base
.sk
: NULL
;
1405 retval
= sctp_chunkify(skb
, asoc
, sk
, gfp
);
1411 retval
->chunk_hdr
= chunk_hdr
;
1412 retval
->chunk_end
= ((__u8
*)chunk_hdr
) + sizeof(*chunk_hdr
);
1414 /* Determine if the chunk needs to be authenticated */
1415 if (sctp_auth_send_cid(type
, asoc
))
1423 static struct sctp_chunk
*sctp_make_data(const struct sctp_association
*asoc
,
1424 __u8 flags
, int paylen
, gfp_t gfp
)
1426 return _sctp_make_chunk(asoc
, SCTP_CID_DATA
, flags
, paylen
, gfp
);
1429 struct sctp_chunk
*sctp_make_idata(const struct sctp_association
*asoc
,
1430 __u8 flags
, int paylen
, gfp_t gfp
)
1432 return _sctp_make_chunk(asoc
, SCTP_CID_I_DATA
, flags
, paylen
, gfp
);
1435 static struct sctp_chunk
*sctp_make_control(const struct sctp_association
*asoc
,
1436 __u8 type
, __u8 flags
, int paylen
,
1439 struct sctp_chunk
*chunk
;
1441 chunk
= _sctp_make_chunk(asoc
, type
, flags
, paylen
, gfp
);
1443 sctp_control_set_owner_w(chunk
);
1448 /* Release the memory occupied by a chunk. */
1449 static void sctp_chunk_destroy(struct sctp_chunk
*chunk
)
1451 BUG_ON(!list_empty(&chunk
->list
));
1452 list_del_init(&chunk
->transmitted_list
);
1454 consume_skb(chunk
->skb
);
1455 consume_skb(chunk
->auth_chunk
);
1457 SCTP_DBG_OBJCNT_DEC(chunk
);
1458 kmem_cache_free(sctp_chunk_cachep
, chunk
);
1461 /* Possibly, free the chunk. */
1462 void sctp_chunk_free(struct sctp_chunk
*chunk
)
1464 /* Release our reference on the message tracker. */
1466 sctp_datamsg_put(chunk
->msg
);
1468 sctp_chunk_put(chunk
);
1471 /* Grab a reference to the chunk. */
1472 void sctp_chunk_hold(struct sctp_chunk
*ch
)
1474 refcount_inc(&ch
->refcnt
);
1477 /* Release a reference to the chunk. */
1478 void sctp_chunk_put(struct sctp_chunk
*ch
)
1480 if (refcount_dec_and_test(&ch
->refcnt
))
1481 sctp_chunk_destroy(ch
);
1484 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1487 void *sctp_addto_chunk(struct sctp_chunk
*chunk
, int len
, const void *data
)
1489 int chunklen
= ntohs(chunk
->chunk_hdr
->length
);
1490 int padlen
= SCTP_PAD4(chunklen
) - chunklen
;
1493 skb_put_zero(chunk
->skb
, padlen
);
1494 target
= skb_put_data(chunk
->skb
, data
, len
);
1496 /* Adjust the chunk length field. */
1497 chunk
->chunk_hdr
->length
= htons(chunklen
+ padlen
+ len
);
1498 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1503 /* Append bytes from user space to the end of a chunk. Will panic if
1504 * chunk is not big enough.
1505 * Returns a kernel err value.
1507 int sctp_user_addto_chunk(struct sctp_chunk
*chunk
, int len
,
1508 struct iov_iter
*from
)
1512 /* Make room in chunk for data. */
1513 target
= skb_put(chunk
->skb
, len
);
1515 /* Copy data (whole iovec) into chunk */
1516 if (!copy_from_iter_full(target
, len
, from
))
1519 /* Adjust the chunk length field. */
1520 chunk
->chunk_hdr
->length
=
1521 htons(ntohs(chunk
->chunk_hdr
->length
) + len
);
1522 chunk
->chunk_end
= skb_tail_pointer(chunk
->skb
);
1527 /* Helper function to assign a TSN if needed. This assumes that both
1528 * the data_hdr and association have already been assigned.
1530 void sctp_chunk_assign_ssn(struct sctp_chunk
*chunk
)
1532 struct sctp_stream
*stream
;
1533 struct sctp_chunk
*lchunk
;
1534 struct sctp_datamsg
*msg
;
1540 /* All fragments will be on the same stream */
1541 sid
= ntohs(chunk
->subh
.data_hdr
->stream
);
1542 stream
= &chunk
->asoc
->stream
;
1544 /* Now assign the sequence number to the entire message.
1545 * All fragments must have the same stream sequence number.
1548 list_for_each_entry(lchunk
, &msg
->chunks
, frag_list
) {
1549 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_UNORDERED
) {
1552 if (lchunk
->chunk_hdr
->flags
& SCTP_DATA_LAST_FRAG
)
1553 ssn
= sctp_ssn_next(stream
, out
, sid
);
1555 ssn
= sctp_ssn_peek(stream
, out
, sid
);
1558 lchunk
->subh
.data_hdr
->ssn
= htons(ssn
);
1559 lchunk
->has_ssn
= 1;
1563 /* Helper function to assign a TSN if needed. This assumes that both
1564 * the data_hdr and association have already been assigned.
1566 void sctp_chunk_assign_tsn(struct sctp_chunk
*chunk
)
1568 if (!chunk
->has_tsn
) {
1569 /* This is the last possible instant to
1572 chunk
->subh
.data_hdr
->tsn
=
1573 htonl(sctp_association_get_next_tsn(chunk
->asoc
));
1578 /* Create a CLOSED association to use with an incoming packet. */
1579 struct sctp_association
*sctp_make_temp_asoc(const struct sctp_endpoint
*ep
,
1580 struct sctp_chunk
*chunk
,
1583 struct sctp_association
*asoc
;
1584 enum sctp_scope scope
;
1585 struct sk_buff
*skb
;
1587 /* Create the bare association. */
1588 scope
= sctp_scope(sctp_source(chunk
));
1589 asoc
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1594 /* Create an entry for the source address of the packet. */
1595 SCTP_INPUT_CB(skb
)->af
->from_skb(&asoc
->c
.peer_addr
, skb
, 1);
1601 /* Build a cookie representing asoc.
1602 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1604 static struct sctp_cookie_param
*sctp_pack_cookie(
1605 const struct sctp_endpoint
*ep
,
1606 const struct sctp_association
*asoc
,
1607 const struct sctp_chunk
*init_chunk
,
1608 int *cookie_len
, const __u8
*raw_addrs
,
1611 struct sctp_signed_cookie
*cookie
;
1612 struct sctp_cookie_param
*retval
;
1613 int headersize
, bodysize
;
1615 /* Header size is static data prior to the actual cookie, including
1618 headersize
= sizeof(struct sctp_paramhdr
) +
1619 (sizeof(struct sctp_signed_cookie
) -
1620 sizeof(struct sctp_cookie
));
1621 bodysize
= sizeof(struct sctp_cookie
)
1622 + ntohs(init_chunk
->chunk_hdr
->length
) + addrs_len
;
1624 /* Pad out the cookie to a multiple to make the signature
1625 * functions simpler to write.
1627 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1628 bodysize
+= SCTP_COOKIE_MULTIPLE
1629 - (bodysize
% SCTP_COOKIE_MULTIPLE
);
1630 *cookie_len
= headersize
+ bodysize
;
1632 /* Clear this memory since we are sending this data structure
1633 * out on the network.
1635 retval
= kzalloc(*cookie_len
, GFP_ATOMIC
);
1639 cookie
= (struct sctp_signed_cookie
*) retval
->body
;
1641 /* Set up the parameter header. */
1642 retval
->p
.type
= SCTP_PARAM_STATE_COOKIE
;
1643 retval
->p
.length
= htons(*cookie_len
);
1645 /* Copy the cookie part of the association itself. */
1646 cookie
->c
= asoc
->c
;
1647 /* Save the raw address list length in the cookie. */
1648 cookie
->c
.raw_addr_list_len
= addrs_len
;
1650 /* Remember PR-SCTP capability. */
1651 cookie
->c
.prsctp_capable
= asoc
->peer
.prsctp_capable
;
1653 /* Save adaptation indication in the cookie. */
1654 cookie
->c
.adaptation_ind
= asoc
->peer
.adaptation_ind
;
1656 /* Set an expiration time for the cookie. */
1657 cookie
->c
.expiration
= ktime_add(asoc
->cookie_life
,
1660 /* Copy the peer's init packet. */
1661 memcpy(&cookie
->c
.peer_init
[0], init_chunk
->chunk_hdr
,
1662 ntohs(init_chunk
->chunk_hdr
->length
));
1664 /* Copy the raw local address list of the association. */
1665 memcpy((__u8
*)&cookie
->c
.peer_init
[0] +
1666 ntohs(init_chunk
->chunk_hdr
->length
), raw_addrs
, addrs_len
);
1668 if (sctp_sk(ep
->base
.sk
)->hmac
) {
1669 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1672 /* Sign the message. */
1673 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1675 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1676 sizeof(ep
->secret_key
)) ?:
1677 crypto_shash_digest(desc
, (u8
*)&cookie
->c
, bodysize
,
1679 shash_desc_zero(desc
);
1693 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1694 struct sctp_association
*sctp_unpack_cookie(
1695 const struct sctp_endpoint
*ep
,
1696 const struct sctp_association
*asoc
,
1697 struct sctp_chunk
*chunk
, gfp_t gfp
,
1698 int *error
, struct sctp_chunk
**errp
)
1700 struct sctp_association
*retval
= NULL
;
1701 int headersize
, bodysize
, fixed_size
;
1702 struct sctp_signed_cookie
*cookie
;
1703 struct sk_buff
*skb
= chunk
->skb
;
1704 struct sctp_cookie
*bear_cookie
;
1705 __u8
*digest
= ep
->digest
;
1706 enum sctp_scope scope
;
1710 /* Header size is static data prior to the actual cookie, including
1713 headersize
= sizeof(struct sctp_chunkhdr
) +
1714 (sizeof(struct sctp_signed_cookie
) -
1715 sizeof(struct sctp_cookie
));
1716 bodysize
= ntohs(chunk
->chunk_hdr
->length
) - headersize
;
1717 fixed_size
= headersize
+ sizeof(struct sctp_cookie
);
1719 /* Verify that the chunk looks like it even has a cookie.
1720 * There must be enough room for our cookie and our peer's
1723 len
= ntohs(chunk
->chunk_hdr
->length
);
1724 if (len
< fixed_size
+ sizeof(struct sctp_chunkhdr
))
1727 /* Verify that the cookie has been padded out. */
1728 if (bodysize
% SCTP_COOKIE_MULTIPLE
)
1731 /* Process the cookie. */
1732 cookie
= chunk
->subh
.cookie_hdr
;
1733 bear_cookie
= &cookie
->c
;
1735 if (!sctp_sk(ep
->base
.sk
)->hmac
)
1738 /* Check the signature. */
1740 SHASH_DESC_ON_STACK(desc
, sctp_sk(ep
->base
.sk
)->hmac
);
1743 desc
->tfm
= sctp_sk(ep
->base
.sk
)->hmac
;
1745 err
= crypto_shash_setkey(desc
->tfm
, ep
->secret_key
,
1746 sizeof(ep
->secret_key
)) ?:
1747 crypto_shash_digest(desc
, (u8
*)bear_cookie
, bodysize
,
1749 shash_desc_zero(desc
);
1752 *error
= -SCTP_IERROR_NOMEM
;
1757 if (memcmp(digest
, cookie
->signature
, SCTP_SIGNATURE_SIZE
)) {
1758 *error
= -SCTP_IERROR_BAD_SIG
;
1763 /* IG Section 2.35.2:
1764 * 3) Compare the port numbers and the verification tag contained
1765 * within the COOKIE ECHO chunk to the actual port numbers and the
1766 * verification tag within the SCTP common header of the received
1767 * packet. If these values do not match the packet MUST be silently
1770 if (ntohl(chunk
->sctp_hdr
->vtag
) != bear_cookie
->my_vtag
) {
1771 *error
= -SCTP_IERROR_BAD_TAG
;
1775 if (chunk
->sctp_hdr
->source
!= bear_cookie
->peer_addr
.v4
.sin_port
||
1776 ntohs(chunk
->sctp_hdr
->dest
) != bear_cookie
->my_port
) {
1777 *error
= -SCTP_IERROR_BAD_PORTS
;
1781 /* Check to see if the cookie is stale. If there is already
1782 * an association, there is no need to check cookie's expiration
1783 * for init collision case of lost COOKIE ACK.
1784 * If skb has been timestamped, then use the stamp, otherwise
1785 * use current time. This introduces a small possibility that
1786 * that a cookie may be considered expired, but his would only slow
1787 * down the new association establishment instead of every packet.
1789 if (sock_flag(ep
->base
.sk
, SOCK_TIMESTAMP
))
1790 kt
= skb_get_ktime(skb
);
1792 kt
= ktime_get_real();
1794 if (!asoc
&& ktime_before(bear_cookie
->expiration
, kt
)) {
1795 suseconds_t usecs
= ktime_to_us(ktime_sub(kt
, bear_cookie
->expiration
));
1796 __be32 n
= htonl(usecs
);
1799 * Section 3.3.10.3 Stale Cookie Error (3)
1803 * Stale Cookie Error: Indicates the receipt of a valid State
1804 * Cookie that has expired.
1806 *errp
= sctp_make_op_error(asoc
, chunk
,
1807 SCTP_ERROR_STALE_COOKIE
, &n
,
1810 *error
= -SCTP_IERROR_STALE_COOKIE
;
1812 *error
= -SCTP_IERROR_NOMEM
;
1817 /* Make a new base association. */
1818 scope
= sctp_scope(sctp_source(chunk
));
1819 retval
= sctp_association_new(ep
, ep
->base
.sk
, scope
, gfp
);
1821 *error
= -SCTP_IERROR_NOMEM
;
1825 /* Set up our peer's port number. */
1826 retval
->peer
.port
= ntohs(chunk
->sctp_hdr
->source
);
1828 /* Populate the association from the cookie. */
1829 memcpy(&retval
->c
, bear_cookie
, sizeof(*bear_cookie
));
1831 if (sctp_assoc_set_bind_addr_from_cookie(retval
, bear_cookie
,
1833 *error
= -SCTP_IERROR_NOMEM
;
1837 /* Also, add the destination address. */
1838 if (list_empty(&retval
->base
.bind_addr
.address_list
)) {
1839 sctp_add_bind_addr(&retval
->base
.bind_addr
, &chunk
->dest
,
1840 sizeof(chunk
->dest
), SCTP_ADDR_SRC
,
1844 retval
->next_tsn
= retval
->c
.initial_tsn
;
1845 retval
->ctsn_ack_point
= retval
->next_tsn
- 1;
1846 retval
->addip_serial
= retval
->c
.initial_tsn
;
1847 retval
->strreset_outseq
= retval
->c
.initial_tsn
;
1848 retval
->adv_peer_ack_point
= retval
->ctsn_ack_point
;
1849 retval
->peer
.prsctp_capable
= retval
->c
.prsctp_capable
;
1850 retval
->peer
.adaptation_ind
= retval
->c
.adaptation_ind
;
1852 /* The INIT stuff will be done by the side effects. */
1857 sctp_association_free(retval
);
1862 /* Yikes! The packet is either corrupt or deliberately
1865 *error
= -SCTP_IERROR_MALFORMED
;
1869 /********************************************************************
1870 * 3rd Level Abstractions
1871 ********************************************************************/
1873 struct __sctp_missing
{
1879 * Report a missing mandatory parameter.
1881 static int sctp_process_missing_param(const struct sctp_association
*asoc
,
1882 enum sctp_param paramtype
,
1883 struct sctp_chunk
*chunk
,
1884 struct sctp_chunk
**errp
)
1886 struct __sctp_missing report
;
1889 len
= SCTP_PAD4(sizeof(report
));
1891 /* Make an ERROR chunk, preparing enough room for
1892 * returning multiple unknown parameters.
1895 *errp
= sctp_make_op_error_space(asoc
, chunk
, len
);
1898 report
.num_missing
= htonl(1);
1899 report
.type
= paramtype
;
1900 sctp_init_cause(*errp
, SCTP_ERROR_MISS_PARAM
,
1902 sctp_addto_chunk(*errp
, sizeof(report
), &report
);
1905 /* Stop processing this chunk. */
1909 /* Report an Invalid Mandatory Parameter. */
1910 static int sctp_process_inv_mandatory(const struct sctp_association
*asoc
,
1911 struct sctp_chunk
*chunk
,
1912 struct sctp_chunk
**errp
)
1914 /* Invalid Mandatory Parameter Error has no payload. */
1917 *errp
= sctp_make_op_error_space(asoc
, chunk
, 0);
1920 sctp_init_cause(*errp
, SCTP_ERROR_INV_PARAM
, 0);
1922 /* Stop processing this chunk. */
1926 static int sctp_process_inv_paramlength(const struct sctp_association
*asoc
,
1927 struct sctp_paramhdr
*param
,
1928 const struct sctp_chunk
*chunk
,
1929 struct sctp_chunk
**errp
)
1931 /* This is a fatal error. Any accumulated non-fatal errors are
1935 sctp_chunk_free(*errp
);
1937 /* Create an error chunk and fill it in with our payload. */
1938 *errp
= sctp_make_violation_paramlen(asoc
, chunk
, param
);
1944 /* Do not attempt to handle the HOST_NAME parm. However, do
1945 * send back an indicator to the peer.
1947 static int sctp_process_hn_param(const struct sctp_association
*asoc
,
1948 union sctp_params param
,
1949 struct sctp_chunk
*chunk
,
1950 struct sctp_chunk
**errp
)
1952 __u16 len
= ntohs(param
.p
->length
);
1954 /* Processing of the HOST_NAME parameter will generate an
1955 * ABORT. If we've accumulated any non-fatal errors, they
1956 * would be unrecognized parameters and we should not include
1957 * them in the ABORT.
1960 sctp_chunk_free(*errp
);
1962 *errp
= sctp_make_op_error(asoc
, chunk
, SCTP_ERROR_DNS_FAILED
,
1965 /* Stop processing this chunk. */
1969 static int sctp_verify_ext_param(struct net
*net
,
1970 const struct sctp_endpoint
*ep
,
1971 union sctp_params param
)
1973 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
1974 int have_asconf
= 0;
1978 for (i
= 0; i
< num_ext
; i
++) {
1979 switch (param
.ext
->chunks
[i
]) {
1983 case SCTP_CID_ASCONF
:
1984 case SCTP_CID_ASCONF_ACK
:
1990 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1991 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1992 * only if ADD-IP is turned on and we are not backward-compatible
1995 if (net
->sctp
.addip_noauth
)
1998 if (ep
->asconf_enable
&& !have_auth
&& have_asconf
)
2004 static void sctp_process_ext_param(struct sctp_association
*asoc
,
2005 union sctp_params param
)
2007 __u16 num_ext
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2010 for (i
= 0; i
< num_ext
; i
++) {
2011 switch (param
.ext
->chunks
[i
]) {
2012 case SCTP_CID_RECONF
:
2013 if (asoc
->ep
->reconf_enable
)
2014 asoc
->peer
.reconf_capable
= 1;
2016 case SCTP_CID_FWD_TSN
:
2017 if (asoc
->ep
->prsctp_enable
)
2018 asoc
->peer
.prsctp_capable
= 1;
2021 /* if the peer reports AUTH, assume that he
2024 if (asoc
->ep
->auth_enable
)
2025 asoc
->peer
.auth_capable
= 1;
2027 case SCTP_CID_ASCONF
:
2028 case SCTP_CID_ASCONF_ACK
:
2029 if (asoc
->ep
->asconf_enable
)
2030 asoc
->peer
.asconf_capable
= 1;
2032 case SCTP_CID_I_DATA
:
2033 if (asoc
->ep
->intl_enable
)
2034 asoc
->peer
.intl_capable
= 1;
2042 /* RFC 3.2.1 & the Implementers Guide 2.2.
2044 * The Parameter Types are encoded such that the
2045 * highest-order two bits specify the action that must be
2046 * taken if the processing endpoint does not recognize the
2049 * 00 - Stop processing this parameter; do not process any further
2050 * parameters within this chunk
2052 * 01 - Stop processing this parameter, do not process any further
2053 * parameters within this chunk, and report the unrecognized
2054 * parameter in an 'Unrecognized Parameter' ERROR chunk.
2056 * 10 - Skip this parameter and continue processing.
2058 * 11 - Skip this parameter and continue processing but
2059 * report the unrecognized parameter in an
2060 * 'Unrecognized Parameter' ERROR chunk.
2063 * SCTP_IERROR_NO_ERROR - continue with the chunk
2064 * SCTP_IERROR_ERROR - stop and report an error.
2065 * SCTP_IERROR_NOMEME - out of memory.
2067 static enum sctp_ierror
sctp_process_unk_param(
2068 const struct sctp_association
*asoc
,
2069 union sctp_params param
,
2070 struct sctp_chunk
*chunk
,
2071 struct sctp_chunk
**errp
)
2073 int retval
= SCTP_IERROR_NO_ERROR
;
2075 switch (param
.p
->type
& SCTP_PARAM_ACTION_MASK
) {
2076 case SCTP_PARAM_ACTION_DISCARD
:
2077 retval
= SCTP_IERROR_ERROR
;
2079 case SCTP_PARAM_ACTION_SKIP
:
2081 case SCTP_PARAM_ACTION_DISCARD_ERR
:
2082 retval
= SCTP_IERROR_ERROR
;
2084 case SCTP_PARAM_ACTION_SKIP_ERR
:
2085 /* Make an ERROR chunk, preparing enough room for
2086 * returning multiple unknown parameters.
2089 *errp
= sctp_make_op_error_limited(asoc
, chunk
);
2091 /* If there is no memory for generating the
2092 * ERROR report as specified, an ABORT will be
2093 * triggered to the peer and the association
2094 * won't be established.
2096 retval
= SCTP_IERROR_NOMEM
;
2101 if (!sctp_init_cause(*errp
, SCTP_ERROR_UNKNOWN_PARAM
,
2102 ntohs(param
.p
->length
)))
2103 sctp_addto_chunk(*errp
, ntohs(param
.p
->length
),
2113 /* Verify variable length parameters
2115 * SCTP_IERROR_ABORT - trigger an ABORT
2116 * SCTP_IERROR_NOMEM - out of memory (abort)
2117 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2118 * SCTP_IERROR_NO_ERROR - continue with the chunk
2120 static enum sctp_ierror
sctp_verify_param(struct net
*net
,
2121 const struct sctp_endpoint
*ep
,
2122 const struct sctp_association
*asoc
,
2123 union sctp_params param
,
2125 struct sctp_chunk
*chunk
,
2126 struct sctp_chunk
**err_chunk
)
2128 struct sctp_hmac_algo_param
*hmacs
;
2129 int retval
= SCTP_IERROR_NO_ERROR
;
2130 __u16 n_elt
, id
= 0;
2133 /* FIXME - This routine is not looking at each parameter per the
2134 * chunk type, i.e., unrecognized parameters should be further
2135 * identified based on the chunk id.
2138 switch (param
.p
->type
) {
2139 case SCTP_PARAM_IPV4_ADDRESS
:
2140 case SCTP_PARAM_IPV6_ADDRESS
:
2141 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2142 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2143 case SCTP_PARAM_STATE_COOKIE
:
2144 case SCTP_PARAM_HEARTBEAT_INFO
:
2145 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2146 case SCTP_PARAM_ECN_CAPABLE
:
2147 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2150 case SCTP_PARAM_SUPPORTED_EXT
:
2151 if (!sctp_verify_ext_param(net
, ep
, param
))
2152 return SCTP_IERROR_ABORT
;
2155 case SCTP_PARAM_SET_PRIMARY
:
2156 if (ep
->asconf_enable
)
2160 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2161 /* Tell the peer, we won't support this param. */
2162 sctp_process_hn_param(asoc
, param
, chunk
, err_chunk
);
2163 retval
= SCTP_IERROR_ABORT
;
2166 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2167 if (ep
->prsctp_enable
)
2171 case SCTP_PARAM_RANDOM
:
2172 if (!ep
->auth_enable
)
2175 /* SCTP-AUTH: Secion 6.1
2176 * If the random number is not 32 byte long the association
2177 * MUST be aborted. The ABORT chunk SHOULD contain the error
2178 * cause 'Protocol Violation'.
2180 if (SCTP_AUTH_RANDOM_LENGTH
!= ntohs(param
.p
->length
) -
2181 sizeof(struct sctp_paramhdr
)) {
2182 sctp_process_inv_paramlength(asoc
, param
.p
,
2184 retval
= SCTP_IERROR_ABORT
;
2188 case SCTP_PARAM_CHUNKS
:
2189 if (!ep
->auth_enable
)
2192 /* SCTP-AUTH: Section 3.2
2193 * The CHUNKS parameter MUST be included once in the INIT or
2194 * INIT-ACK chunk if the sender wants to receive authenticated
2195 * chunks. Its maximum length is 260 bytes.
2197 if (260 < ntohs(param
.p
->length
)) {
2198 sctp_process_inv_paramlength(asoc
, param
.p
,
2200 retval
= SCTP_IERROR_ABORT
;
2204 case SCTP_PARAM_HMAC_ALGO
:
2205 if (!ep
->auth_enable
)
2208 hmacs
= (struct sctp_hmac_algo_param
*)param
.p
;
2209 n_elt
= (ntohs(param
.p
->length
) -
2210 sizeof(struct sctp_paramhdr
)) >> 1;
2212 /* SCTP-AUTH: Section 6.1
2213 * The HMAC algorithm based on SHA-1 MUST be supported and
2214 * included in the HMAC-ALGO parameter.
2216 for (i
= 0; i
< n_elt
; i
++) {
2217 id
= ntohs(hmacs
->hmac_ids
[i
]);
2219 if (id
== SCTP_AUTH_HMAC_ID_SHA1
)
2223 if (id
!= SCTP_AUTH_HMAC_ID_SHA1
) {
2224 sctp_process_inv_paramlength(asoc
, param
.p
, chunk
,
2226 retval
= SCTP_IERROR_ABORT
;
2231 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
2232 __func__
, ntohs(param
.p
->type
), cid
);
2234 retval
= sctp_process_unk_param(asoc
, param
, chunk
, err_chunk
);
2240 /* Verify the INIT packet before we process it. */
2241 int sctp_verify_init(struct net
*net
, const struct sctp_endpoint
*ep
,
2242 const struct sctp_association
*asoc
, enum sctp_cid cid
,
2243 struct sctp_init_chunk
*peer_init
,
2244 struct sctp_chunk
*chunk
, struct sctp_chunk
**errp
)
2246 union sctp_params param
;
2247 bool has_cookie
= false;
2250 /* Check for missing mandatory parameters. Note: Initial TSN is
2251 * also mandatory, but is not checked here since the valid range
2252 * is 0..2**32-1. RFC4960, section 3.3.3.
2254 if (peer_init
->init_hdr
.num_outbound_streams
== 0 ||
2255 peer_init
->init_hdr
.num_inbound_streams
== 0 ||
2256 peer_init
->init_hdr
.init_tag
== 0 ||
2257 ntohl(peer_init
->init_hdr
.a_rwnd
) < SCTP_DEFAULT_MINWINDOW
)
2258 return sctp_process_inv_mandatory(asoc
, chunk
, errp
);
2260 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2261 if (param
.p
->type
== SCTP_PARAM_STATE_COOKIE
)
2265 /* There is a possibility that a parameter length was bad and
2266 * in that case we would have stoped walking the parameters.
2267 * The current param.p would point at the bad one.
2268 * Current consensus on the mailing list is to generate a PROTOCOL
2269 * VIOLATION error. We build the ERROR chunk here and let the normal
2270 * error handling code build and send the packet.
2272 if (param
.v
!= (void *)chunk
->chunk_end
)
2273 return sctp_process_inv_paramlength(asoc
, param
.p
, chunk
, errp
);
2275 /* The only missing mandatory param possible today is
2276 * the state cookie for an INIT-ACK chunk.
2278 if ((SCTP_CID_INIT_ACK
== cid
) && !has_cookie
)
2279 return sctp_process_missing_param(asoc
, SCTP_PARAM_STATE_COOKIE
,
2282 /* Verify all the variable length parameters */
2283 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2284 result
= sctp_verify_param(net
, ep
, asoc
, param
, cid
,
2287 case SCTP_IERROR_ABORT
:
2288 case SCTP_IERROR_NOMEM
:
2290 case SCTP_IERROR_ERROR
:
2292 case SCTP_IERROR_NO_ERROR
:
2297 } /* for (loop through all parameters) */
2302 /* Unpack the parameters in an INIT packet into an association.
2303 * Returns 0 on failure, else success.
2304 * FIXME: This is an association method.
2306 int sctp_process_init(struct sctp_association
*asoc
, struct sctp_chunk
*chunk
,
2307 const union sctp_addr
*peer_addr
,
2308 struct sctp_init_chunk
*peer_init
, gfp_t gfp
)
2310 struct net
*net
= sock_net(asoc
->base
.sk
);
2311 struct sctp_transport
*transport
;
2312 struct list_head
*pos
, *temp
;
2313 union sctp_params param
;
2314 union sctp_addr addr
;
2318 /* We must include the address that the INIT packet came from.
2319 * This is the only address that matters for an INIT packet.
2320 * When processing a COOKIE ECHO, we retrieve the from address
2321 * of the INIT from the cookie.
2324 /* This implementation defaults to making the first transport
2325 * added as the primary transport. The source address seems to
2326 * be a a better choice than any of the embedded addresses.
2328 if (!sctp_assoc_add_peer(asoc
, peer_addr
, gfp
, SCTP_ACTIVE
))
2331 if (sctp_cmp_addr_exact(sctp_source(chunk
), peer_addr
))
2334 /* Process the initialization parameters. */
2335 sctp_walk_params(param
, peer_init
, init_hdr
.params
) {
2336 if (!src_match
&& (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
2337 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)) {
2338 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2339 af
->from_addr_param(&addr
, param
.addr
,
2340 chunk
->sctp_hdr
->source
, 0);
2341 if (sctp_cmp_addr_exact(sctp_source(chunk
), &addr
))
2345 if (!sctp_process_param(asoc
, param
, peer_addr
, gfp
))
2349 /* source address of chunk may not match any valid address */
2353 /* AUTH: After processing the parameters, make sure that we
2354 * have all the required info to potentially do authentications.
2356 if (asoc
->peer
.auth_capable
&& (!asoc
->peer
.peer_random
||
2357 !asoc
->peer
.peer_hmacs
))
2358 asoc
->peer
.auth_capable
= 0;
2360 /* In a non-backward compatible mode, if the peer claims
2361 * support for ADD-IP but not AUTH, the ADD-IP spec states
2362 * that we MUST ABORT the association. Section 6. The section
2363 * also give us an option to silently ignore the packet, which
2364 * is what we'll do here.
2366 if (!net
->sctp
.addip_noauth
&&
2367 (asoc
->peer
.asconf_capable
&& !asoc
->peer
.auth_capable
)) {
2368 asoc
->peer
.addip_disabled_mask
|= (SCTP_PARAM_ADD_IP
|
2370 SCTP_PARAM_SET_PRIMARY
);
2371 asoc
->peer
.asconf_capable
= 0;
2375 /* Walk list of transports, removing transports in the UNKNOWN state. */
2376 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2377 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2378 if (transport
->state
== SCTP_UNKNOWN
) {
2379 sctp_assoc_rm_peer(asoc
, transport
);
2383 /* The fixed INIT headers are always in network byte
2386 asoc
->peer
.i
.init_tag
=
2387 ntohl(peer_init
->init_hdr
.init_tag
);
2388 asoc
->peer
.i
.a_rwnd
=
2389 ntohl(peer_init
->init_hdr
.a_rwnd
);
2390 asoc
->peer
.i
.num_outbound_streams
=
2391 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2392 asoc
->peer
.i
.num_inbound_streams
=
2393 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2394 asoc
->peer
.i
.initial_tsn
=
2395 ntohl(peer_init
->init_hdr
.initial_tsn
);
2397 asoc
->strreset_inseq
= asoc
->peer
.i
.initial_tsn
;
2399 /* Apply the upper bounds for output streams based on peer's
2400 * number of inbound streams.
2402 if (asoc
->c
.sinit_num_ostreams
>
2403 ntohs(peer_init
->init_hdr
.num_inbound_streams
)) {
2404 asoc
->c
.sinit_num_ostreams
=
2405 ntohs(peer_init
->init_hdr
.num_inbound_streams
);
2408 if (asoc
->c
.sinit_max_instreams
>
2409 ntohs(peer_init
->init_hdr
.num_outbound_streams
)) {
2410 asoc
->c
.sinit_max_instreams
=
2411 ntohs(peer_init
->init_hdr
.num_outbound_streams
);
2414 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2415 asoc
->c
.peer_vtag
= asoc
->peer
.i
.init_tag
;
2417 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2418 asoc
->peer
.rwnd
= asoc
->peer
.i
.a_rwnd
;
2420 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2421 * high (for example, implementations MAY use the size of the receiver
2422 * advertised window).
2424 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
2426 transport
->ssthresh
= asoc
->peer
.i
.a_rwnd
;
2429 /* Set up the TSN tracking pieces. */
2430 if (!sctp_tsnmap_init(&asoc
->peer
.tsn_map
, SCTP_TSN_MAP_INITIAL
,
2431 asoc
->peer
.i
.initial_tsn
, gfp
))
2434 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2436 * The stream sequence number in all the streams shall start
2437 * from 0 when the association is established. Also, when the
2438 * stream sequence number reaches the value 65535 the next
2439 * stream sequence number shall be set to 0.
2442 if (sctp_stream_init(&asoc
->stream
, asoc
->c
.sinit_num_ostreams
,
2443 asoc
->c
.sinit_max_instreams
, gfp
))
2446 /* Update frag_point when stream_interleave may get changed. */
2447 sctp_assoc_update_frag_point(asoc
);
2449 if (!asoc
->temp
&& sctp_assoc_set_id(asoc
, gfp
))
2452 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2454 * When an endpoint has an ASCONF signaled change to be sent to the
2455 * remote endpoint it should do the following:
2457 * A2) A serial number should be assigned to the Chunk. The serial
2458 * number should be a monotonically increasing number. All serial
2459 * numbers are defined to be initialized at the start of the
2460 * association to the same value as the Initial TSN.
2462 asoc
->peer
.addip_serial
= asoc
->peer
.i
.initial_tsn
- 1;
2466 /* Release the transport structures. */
2467 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
2468 transport
= list_entry(pos
, struct sctp_transport
, transports
);
2469 if (transport
->state
!= SCTP_ACTIVE
)
2470 sctp_assoc_rm_peer(asoc
, transport
);
2478 /* Update asoc with the option described in param.
2480 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2482 * asoc is the association to update.
2483 * param is the variable length parameter to use for update.
2484 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2485 * If the current packet is an INIT we want to minimize the amount of
2486 * work we do. In particular, we should not build transport
2487 * structures for the addresses.
2489 static int sctp_process_param(struct sctp_association
*asoc
,
2490 union sctp_params param
,
2491 const union sctp_addr
*peer_addr
,
2494 struct net
*net
= sock_net(asoc
->base
.sk
);
2495 struct sctp_endpoint
*ep
= asoc
->ep
;
2496 union sctp_addr_param
*addr_param
;
2497 struct sctp_transport
*t
;
2498 enum sctp_scope scope
;
2499 union sctp_addr addr
;
2505 /* We maintain all INIT parameters in network byte order all the
2506 * time. This allows us to not worry about whether the parameters
2507 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2509 switch (param
.p
->type
) {
2510 case SCTP_PARAM_IPV6_ADDRESS
:
2511 if (PF_INET6
!= asoc
->base
.sk
->sk_family
)
2515 case SCTP_PARAM_IPV4_ADDRESS
:
2516 /* v4 addresses are not allowed on v6-only socket */
2517 if (ipv6_only_sock(asoc
->base
.sk
))
2520 af
= sctp_get_af_specific(param_type2af(param
.p
->type
));
2521 af
->from_addr_param(&addr
, param
.addr
, htons(asoc
->peer
.port
), 0);
2522 scope
= sctp_scope(peer_addr
);
2523 if (sctp_in_scope(net
, &addr
, scope
))
2524 if (!sctp_assoc_add_peer(asoc
, &addr
, gfp
, SCTP_UNCONFIRMED
))
2528 case SCTP_PARAM_COOKIE_PRESERVATIVE
:
2529 if (!net
->sctp
.cookie_preserve_enable
)
2532 stale
= ntohl(param
.life
->lifespan_increment
);
2534 /* Suggested Cookie Life span increment's unit is msec,
2537 asoc
->cookie_life
= ktime_add_ms(asoc
->cookie_life
, stale
);
2540 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2541 pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__
);
2544 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES
:
2545 /* Turn off the default values first so we'll know which
2546 * ones are really set by the peer.
2548 asoc
->peer
.ipv4_address
= 0;
2549 asoc
->peer
.ipv6_address
= 0;
2551 /* Assume that peer supports the address family
2552 * by which it sends a packet.
2554 if (peer_addr
->sa
.sa_family
== AF_INET6
)
2555 asoc
->peer
.ipv6_address
= 1;
2556 else if (peer_addr
->sa
.sa_family
== AF_INET
)
2557 asoc
->peer
.ipv4_address
= 1;
2559 /* Cycle through address types; avoid divide by 0. */
2560 sat
= ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2562 sat
/= sizeof(__u16
);
2564 for (i
= 0; i
< sat
; ++i
) {
2565 switch (param
.sat
->types
[i
]) {
2566 case SCTP_PARAM_IPV4_ADDRESS
:
2567 asoc
->peer
.ipv4_address
= 1;
2570 case SCTP_PARAM_IPV6_ADDRESS
:
2571 if (PF_INET6
== asoc
->base
.sk
->sk_family
)
2572 asoc
->peer
.ipv6_address
= 1;
2575 case SCTP_PARAM_HOST_NAME_ADDRESS
:
2576 asoc
->peer
.hostname_address
= 1;
2579 default: /* Just ignore anything else. */
2585 case SCTP_PARAM_STATE_COOKIE
:
2586 asoc
->peer
.cookie_len
=
2587 ntohs(param
.p
->length
) - sizeof(struct sctp_paramhdr
);
2588 kfree(asoc
->peer
.cookie
);
2589 asoc
->peer
.cookie
= kmemdup(param
.cookie
->body
, asoc
->peer
.cookie_len
, gfp
);
2590 if (!asoc
->peer
.cookie
)
2594 case SCTP_PARAM_HEARTBEAT_INFO
:
2595 /* Would be odd to receive, but it causes no problems. */
2598 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS
:
2599 /* Rejected during verify stage. */
2602 case SCTP_PARAM_ECN_CAPABLE
:
2603 if (asoc
->ep
->ecn_enable
) {
2604 asoc
->peer
.ecn_capable
= 1;
2611 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
2612 asoc
->peer
.adaptation_ind
= ntohl(param
.aind
->adaptation_ind
);
2615 case SCTP_PARAM_SET_PRIMARY
:
2616 if (!ep
->asconf_enable
)
2619 addr_param
= param
.v
+ sizeof(struct sctp_addip_param
);
2621 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
2625 af
->from_addr_param(&addr
, addr_param
,
2626 htons(asoc
->peer
.port
), 0);
2628 /* if the address is invalid, we can't process it.
2629 * XXX: see spec for what to do.
2631 if (!af
->addr_valid(&addr
, NULL
, NULL
))
2634 t
= sctp_assoc_lookup_paddr(asoc
, &addr
);
2638 sctp_assoc_set_primary(asoc
, t
);
2641 case SCTP_PARAM_SUPPORTED_EXT
:
2642 sctp_process_ext_param(asoc
, param
);
2645 case SCTP_PARAM_FWD_TSN_SUPPORT
:
2646 if (asoc
->ep
->prsctp_enable
) {
2647 asoc
->peer
.prsctp_capable
= 1;
2653 case SCTP_PARAM_RANDOM
:
2654 if (!ep
->auth_enable
)
2657 /* Save peer's random parameter */
2658 kfree(asoc
->peer
.peer_random
);
2659 asoc
->peer
.peer_random
= kmemdup(param
.p
,
2660 ntohs(param
.p
->length
), gfp
);
2661 if (!asoc
->peer
.peer_random
) {
2667 case SCTP_PARAM_HMAC_ALGO
:
2668 if (!ep
->auth_enable
)
2671 /* Save peer's HMAC list */
2672 kfree(asoc
->peer
.peer_hmacs
);
2673 asoc
->peer
.peer_hmacs
= kmemdup(param
.p
,
2674 ntohs(param
.p
->length
), gfp
);
2675 if (!asoc
->peer
.peer_hmacs
) {
2680 /* Set the default HMAC the peer requested*/
2681 sctp_auth_asoc_set_default_hmac(asoc
, param
.hmac_algo
);
2684 case SCTP_PARAM_CHUNKS
:
2685 if (!ep
->auth_enable
)
2688 kfree(asoc
->peer
.peer_chunks
);
2689 asoc
->peer
.peer_chunks
= kmemdup(param
.p
,
2690 ntohs(param
.p
->length
), gfp
);
2691 if (!asoc
->peer
.peer_chunks
)
2696 /* Any unrecognized parameters should have been caught
2697 * and handled by sctp_verify_param() which should be
2698 * called prior to this routine. Simply log the error
2701 pr_debug("%s: ignoring param:%d for association:%p.\n",
2702 __func__
, ntohs(param
.p
->type
), asoc
);
2709 /* Select a new verification tag. */
2710 __u32
sctp_generate_tag(const struct sctp_endpoint
*ep
)
2712 /* I believe that this random number generator complies with RFC1750.
2713 * A tag of 0 is reserved for special cases (e.g. INIT).
2718 get_random_bytes(&x
, sizeof(__u32
));
2724 /* Select an initial TSN to send during startup. */
2725 __u32
sctp_generate_tsn(const struct sctp_endpoint
*ep
)
2729 get_random_bytes(&retval
, sizeof(__u32
));
2734 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2736 * 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
2737 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2738 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2739 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2741 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2742 * | Address Parameter |
2743 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2744 * | ASCONF Parameter #1 |
2745 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2749 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2750 * | ASCONF Parameter #N |
2751 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2753 * Address Parameter and other parameter will not be wrapped in this function
2755 static struct sctp_chunk
*sctp_make_asconf(struct sctp_association
*asoc
,
2756 union sctp_addr
*addr
,
2759 struct sctp_addiphdr asconf
;
2760 struct sctp_chunk
*retval
;
2761 int length
= sizeof(asconf
) + vparam_len
;
2762 union sctp_addr_param addrparam
;
2764 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2766 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2771 /* Create the chunk. */
2772 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF
, 0, length
,
2777 asconf
.serial
= htonl(asoc
->addip_serial
++);
2779 retval
->subh
.addip_hdr
=
2780 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2781 retval
->param_hdr
.v
=
2782 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2788 * 3.2.1 Add IP Address
2790 * 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
2791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2792 * | Type = 0xC001 | Length = Variable |
2793 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2794 * | ASCONF-Request Correlation ID |
2795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2796 * | Address Parameter |
2797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2799 * 3.2.2 Delete IP Address
2801 * 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
2802 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2803 * | Type = 0xC002 | Length = Variable |
2804 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2805 * | ASCONF-Request Correlation ID |
2806 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2807 * | Address Parameter |
2808 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2811 struct sctp_chunk
*sctp_make_asconf_update_ip(struct sctp_association
*asoc
,
2812 union sctp_addr
*laddr
,
2813 struct sockaddr
*addrs
,
2814 int addrcnt
, __be16 flags
)
2816 union sctp_addr_param addr_param
;
2817 struct sctp_addip_param param
;
2818 int paramlen
= sizeof(param
);
2819 struct sctp_chunk
*retval
;
2820 int addr_param_len
= 0;
2821 union sctp_addr
*addr
;
2822 int totallen
= 0, i
;
2827 /* Get total length of all the address parameters. */
2829 for (i
= 0; i
< addrcnt
; i
++) {
2831 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2832 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2834 totallen
+= paramlen
;
2835 totallen
+= addr_param_len
;
2837 addr_buf
+= af
->sockaddr_len
;
2838 if (asoc
->asconf_addr_del_pending
&& !del_pickup
) {
2839 /* reuse the parameter length from the same scope one */
2840 totallen
+= paramlen
;
2841 totallen
+= addr_param_len
;
2844 pr_debug("%s: picked same-scope del_pending addr, "
2845 "totallen for all addresses is %d\n",
2846 __func__
, totallen
);
2850 /* Create an asconf chunk with the required length. */
2851 retval
= sctp_make_asconf(asoc
, laddr
, totallen
);
2855 /* Add the address parameters to the asconf chunk. */
2857 for (i
= 0; i
< addrcnt
; i
++) {
2859 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2860 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2861 param
.param_hdr
.type
= flags
;
2862 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2863 param
.crr_id
= htonl(i
);
2865 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2866 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2868 addr_buf
+= af
->sockaddr_len
;
2870 if (flags
== SCTP_PARAM_ADD_IP
&& del_pickup
) {
2871 addr
= asoc
->asconf_addr_del_pending
;
2872 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2873 addr_param_len
= af
->to_addr_param(addr
, &addr_param
);
2874 param
.param_hdr
.type
= SCTP_PARAM_DEL_IP
;
2875 param
.param_hdr
.length
= htons(paramlen
+ addr_param_len
);
2876 param
.crr_id
= htonl(i
);
2878 sctp_addto_chunk(retval
, paramlen
, ¶m
);
2879 sctp_addto_chunk(retval
, addr_param_len
, &addr_param
);
2885 * 3.2.4 Set Primary IP Address
2887 * 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
2888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2889 * | Type =0xC004 | Length = Variable |
2890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2891 * | ASCONF-Request Correlation ID |
2892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2893 * | Address Parameter |
2894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2896 * Create an ASCONF chunk with Set Primary IP address parameter.
2898 struct sctp_chunk
*sctp_make_asconf_set_prim(struct sctp_association
*asoc
,
2899 union sctp_addr
*addr
)
2901 struct sctp_af
*af
= sctp_get_af_specific(addr
->v4
.sin_family
);
2902 union sctp_addr_param addrparam
;
2903 struct sctp_addip_param param
;
2904 struct sctp_chunk
*retval
;
2905 int len
= sizeof(param
);
2908 addrlen
= af
->to_addr_param(addr
, &addrparam
);
2913 /* Create the chunk and make asconf header. */
2914 retval
= sctp_make_asconf(asoc
, addr
, len
);
2918 param
.param_hdr
.type
= SCTP_PARAM_SET_PRIMARY
;
2919 param
.param_hdr
.length
= htons(len
);
2922 sctp_addto_chunk(retval
, sizeof(param
), ¶m
);
2923 sctp_addto_chunk(retval
, addrlen
, &addrparam
);
2928 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2930 * 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
2931 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2932 * | Type = 0x80 | Chunk Flags | Chunk Length |
2933 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2935 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2936 * | ASCONF Parameter Response#1 |
2937 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2941 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2942 * | ASCONF Parameter Response#N |
2943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2945 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2947 static struct sctp_chunk
*sctp_make_asconf_ack(const struct sctp_association
*asoc
,
2948 __u32 serial
, int vparam_len
)
2950 struct sctp_addiphdr asconf
;
2951 struct sctp_chunk
*retval
;
2952 int length
= sizeof(asconf
) + vparam_len
;
2954 /* Create the chunk. */
2955 retval
= sctp_make_control(asoc
, SCTP_CID_ASCONF_ACK
, 0, length
,
2960 asconf
.serial
= htonl(serial
);
2962 retval
->subh
.addip_hdr
=
2963 sctp_addto_chunk(retval
, sizeof(asconf
), &asconf
);
2968 /* Add response parameters to an ASCONF_ACK chunk. */
2969 static void sctp_add_asconf_response(struct sctp_chunk
*chunk
, __be32 crr_id
,
2971 struct sctp_addip_param
*asconf_param
)
2973 struct sctp_addip_param ack_param
;
2974 struct sctp_errhdr err_param
;
2975 int asconf_param_len
= 0;
2976 int err_param_len
= 0;
2977 __be16 response_type
;
2979 if (SCTP_ERROR_NO_ERROR
== err_code
) {
2980 response_type
= SCTP_PARAM_SUCCESS_REPORT
;
2982 response_type
= SCTP_PARAM_ERR_CAUSE
;
2983 err_param_len
= sizeof(err_param
);
2986 ntohs(asconf_param
->param_hdr
.length
);
2989 /* Add Success Indication or Error Cause Indication parameter. */
2990 ack_param
.param_hdr
.type
= response_type
;
2991 ack_param
.param_hdr
.length
= htons(sizeof(ack_param
) +
2994 ack_param
.crr_id
= crr_id
;
2995 sctp_addto_chunk(chunk
, sizeof(ack_param
), &ack_param
);
2997 if (SCTP_ERROR_NO_ERROR
== err_code
)
3000 /* Add Error Cause parameter. */
3001 err_param
.cause
= err_code
;
3002 err_param
.length
= htons(err_param_len
+ asconf_param_len
);
3003 sctp_addto_chunk(chunk
, err_param_len
, &err_param
);
3005 /* Add the failed TLV copied from ASCONF chunk. */
3007 sctp_addto_chunk(chunk
, asconf_param_len
, asconf_param
);
3010 /* Process a asconf parameter. */
3011 static __be16
sctp_process_asconf_param(struct sctp_association
*asoc
,
3012 struct sctp_chunk
*asconf
,
3013 struct sctp_addip_param
*asconf_param
)
3015 union sctp_addr_param
*addr_param
;
3016 struct sctp_transport
*peer
;
3017 union sctp_addr addr
;
3020 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3022 if (asconf_param
->param_hdr
.type
!= SCTP_PARAM_ADD_IP
&&
3023 asconf_param
->param_hdr
.type
!= SCTP_PARAM_DEL_IP
&&
3024 asconf_param
->param_hdr
.type
!= SCTP_PARAM_SET_PRIMARY
)
3025 return SCTP_ERROR_UNKNOWN_PARAM
;
3027 switch (addr_param
->p
.type
) {
3028 case SCTP_PARAM_IPV6_ADDRESS
:
3029 if (!asoc
->peer
.ipv6_address
)
3030 return SCTP_ERROR_DNS_FAILED
;
3032 case SCTP_PARAM_IPV4_ADDRESS
:
3033 if (!asoc
->peer
.ipv4_address
)
3034 return SCTP_ERROR_DNS_FAILED
;
3037 return SCTP_ERROR_DNS_FAILED
;
3040 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3042 return SCTP_ERROR_DNS_FAILED
;
3044 af
->from_addr_param(&addr
, addr_param
, htons(asoc
->peer
.port
), 0);
3046 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
3047 * or multicast address.
3048 * (note: wildcard is permitted and requires special handling so
3049 * make sure we check for that)
3051 if (!af
->is_any(&addr
) && !af
->addr_valid(&addr
, NULL
, asconf
->skb
))
3052 return SCTP_ERROR_DNS_FAILED
;
3054 switch (asconf_param
->param_hdr
.type
) {
3055 case SCTP_PARAM_ADD_IP
:
3057 * If the address 0.0.0.0 or ::0 is provided, the source
3058 * address of the packet MUST be added.
3060 if (af
->is_any(&addr
))
3061 memcpy(&addr
, &asconf
->source
, sizeof(addr
));
3063 if (security_sctp_bind_connect(asoc
->ep
->base
.sk
,
3065 (struct sockaddr
*)&addr
,
3067 return SCTP_ERROR_REQ_REFUSED
;
3069 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
3070 * request and does not have the local resources to add this
3071 * new address to the association, it MUST return an Error
3072 * Cause TLV set to the new error code 'Operation Refused
3073 * Due to Resource Shortage'.
3076 peer
= sctp_assoc_add_peer(asoc
, &addr
, GFP_ATOMIC
, SCTP_UNCONFIRMED
);
3078 return SCTP_ERROR_RSRC_LOW
;
3080 /* Start the heartbeat timer. */
3081 sctp_transport_reset_hb_timer(peer
);
3082 asoc
->new_transport
= peer
;
3084 case SCTP_PARAM_DEL_IP
:
3085 /* ADDIP 4.3 D7) If a request is received to delete the
3086 * last remaining IP address of a peer endpoint, the receiver
3087 * MUST send an Error Cause TLV with the error cause set to the
3088 * new error code 'Request to Delete Last Remaining IP Address'.
3090 if (asoc
->peer
.transport_count
== 1)
3091 return SCTP_ERROR_DEL_LAST_IP
;
3093 /* ADDIP 4.3 D8) If a request is received to delete an IP
3094 * address which is also the source address of the IP packet
3095 * which contained the ASCONF chunk, the receiver MUST reject
3096 * this request. To reject the request the receiver MUST send
3097 * an Error Cause TLV set to the new error code 'Request to
3098 * Delete Source IP Address'
3100 if (sctp_cmp_addr_exact(&asconf
->source
, &addr
))
3101 return SCTP_ERROR_DEL_SRC_IP
;
3104 * If the address 0.0.0.0 or ::0 is provided, all
3105 * addresses of the peer except the source address of the
3106 * packet MUST be deleted.
3108 if (af
->is_any(&addr
)) {
3109 sctp_assoc_set_primary(asoc
, asconf
->transport
);
3110 sctp_assoc_del_nonprimary_peers(asoc
,
3112 return SCTP_ERROR_NO_ERROR
;
3115 /* If the address is not part of the association, the
3116 * ASCONF-ACK with Error Cause Indication Parameter
3117 * which including cause of Unresolvable Address should
3120 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3122 return SCTP_ERROR_DNS_FAILED
;
3124 sctp_assoc_rm_peer(asoc
, peer
);
3126 case SCTP_PARAM_SET_PRIMARY
:
3127 /* ADDIP Section 4.2.4
3128 * If the address 0.0.0.0 or ::0 is provided, the receiver
3129 * MAY mark the source address of the packet as its
3132 if (af
->is_any(&addr
))
3133 memcpy(&addr
.v4
, sctp_source(asconf
), sizeof(addr
));
3135 if (security_sctp_bind_connect(asoc
->ep
->base
.sk
,
3136 SCTP_PARAM_SET_PRIMARY
,
3137 (struct sockaddr
*)&addr
,
3139 return SCTP_ERROR_REQ_REFUSED
;
3141 peer
= sctp_assoc_lookup_paddr(asoc
, &addr
);
3143 return SCTP_ERROR_DNS_FAILED
;
3145 sctp_assoc_set_primary(asoc
, peer
);
3149 return SCTP_ERROR_NO_ERROR
;
3152 /* Verify the ASCONF packet before we process it. */
3153 bool sctp_verify_asconf(const struct sctp_association
*asoc
,
3154 struct sctp_chunk
*chunk
, bool addr_param_needed
,
3155 struct sctp_paramhdr
**errp
)
3157 struct sctp_addip_chunk
*addip
;
3158 bool addr_param_seen
= false;
3159 union sctp_params param
;
3161 addip
= (struct sctp_addip_chunk
*)chunk
->chunk_hdr
;
3162 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3163 size_t length
= ntohs(param
.p
->length
);
3166 switch (param
.p
->type
) {
3167 case SCTP_PARAM_ERR_CAUSE
:
3169 case SCTP_PARAM_IPV4_ADDRESS
:
3170 if (length
!= sizeof(struct sctp_ipv4addr_param
))
3172 /* ensure there is only one addr param and it's in the
3173 * beginning of addip_hdr params, or we reject it.
3175 if (param
.v
!= addip
->addip_hdr
.params
)
3177 addr_param_seen
= true;
3179 case SCTP_PARAM_IPV6_ADDRESS
:
3180 if (length
!= sizeof(struct sctp_ipv6addr_param
))
3182 if (param
.v
!= addip
->addip_hdr
.params
)
3184 addr_param_seen
= true;
3186 case SCTP_PARAM_ADD_IP
:
3187 case SCTP_PARAM_DEL_IP
:
3188 case SCTP_PARAM_SET_PRIMARY
:
3189 /* In ASCONF chunks, these need to be first. */
3190 if (addr_param_needed
&& !addr_param_seen
)
3192 length
= ntohs(param
.addip
->param_hdr
.length
);
3193 if (length
< sizeof(struct sctp_addip_param
) +
3197 case SCTP_PARAM_SUCCESS_REPORT
:
3198 case SCTP_PARAM_ADAPTATION_LAYER_IND
:
3199 if (length
!= sizeof(struct sctp_addip_param
))
3203 /* This is unkown to us, reject! */
3208 /* Remaining sanity checks. */
3209 if (addr_param_needed
&& !addr_param_seen
)
3211 if (!addr_param_needed
&& addr_param_seen
)
3213 if (param
.v
!= chunk
->chunk_end
)
3219 /* Process an incoming ASCONF chunk with the next expected serial no. and
3220 * return an ASCONF_ACK chunk to be sent in response.
3222 struct sctp_chunk
*sctp_process_asconf(struct sctp_association
*asoc
,
3223 struct sctp_chunk
*asconf
)
3225 union sctp_addr_param
*addr_param
;
3226 struct sctp_addip_chunk
*addip
;
3227 struct sctp_chunk
*asconf_ack
;
3228 bool all_param_pass
= true;
3229 struct sctp_addiphdr
*hdr
;
3230 int length
= 0, chunk_len
;
3231 union sctp_params param
;
3235 addip
= (struct sctp_addip_chunk
*)asconf
->chunk_hdr
;
3236 chunk_len
= ntohs(asconf
->chunk_hdr
->length
) -
3237 sizeof(struct sctp_chunkhdr
);
3238 hdr
= (struct sctp_addiphdr
*)asconf
->skb
->data
;
3239 serial
= ntohl(hdr
->serial
);
3241 /* Skip the addiphdr and store a pointer to address parameter. */
3242 length
= sizeof(*hdr
);
3243 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3244 chunk_len
-= length
;
3246 /* Skip the address parameter and store a pointer to the first
3249 length
= ntohs(addr_param
->p
.length
);
3250 chunk_len
-= length
;
3252 /* create an ASCONF_ACK chunk.
3253 * Based on the definitions of parameters, we know that the size of
3254 * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF
3257 asconf_ack
= sctp_make_asconf_ack(asoc
, serial
, chunk_len
* 4);
3261 /* Process the TLVs contained within the ASCONF chunk. */
3262 sctp_walk_params(param
, addip
, addip_hdr
.params
) {
3263 /* Skip preceeding address parameters. */
3264 if (param
.p
->type
== SCTP_PARAM_IPV4_ADDRESS
||
3265 param
.p
->type
== SCTP_PARAM_IPV6_ADDRESS
)
3268 err_code
= sctp_process_asconf_param(asoc
, asconf
,
3271 * If an error response is received for a TLV parameter,
3272 * all TLVs with no response before the failed TLV are
3273 * considered successful if not reported. All TLVs after
3274 * the failed response are considered unsuccessful unless
3275 * a specific success indication is present for the parameter.
3277 if (err_code
!= SCTP_ERROR_NO_ERROR
)
3278 all_param_pass
= false;
3279 if (!all_param_pass
)
3280 sctp_add_asconf_response(asconf_ack
, param
.addip
->crr_id
,
3281 err_code
, param
.addip
);
3283 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3284 * an IP address sends an 'Out of Resource' in its response, it
3285 * MUST also fail any subsequent add or delete requests bundled
3288 if (err_code
== SCTP_ERROR_RSRC_LOW
)
3292 asoc
->peer
.addip_serial
++;
3294 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3295 * after freeing the reference to old asconf ack if any.
3298 sctp_chunk_hold(asconf_ack
);
3299 list_add_tail(&asconf_ack
->transmitted_list
,
3300 &asoc
->asconf_ack_list
);
3306 /* Process a asconf parameter that is successfully acked. */
3307 static void sctp_asconf_param_success(struct sctp_association
*asoc
,
3308 struct sctp_addip_param
*asconf_param
)
3310 struct sctp_bind_addr
*bp
= &asoc
->base
.bind_addr
;
3311 union sctp_addr_param
*addr_param
;
3312 struct sctp_sockaddr_entry
*saddr
;
3313 struct sctp_transport
*transport
;
3314 union sctp_addr addr
;
3317 addr_param
= (void *)asconf_param
+ sizeof(*asconf_param
);
3319 /* We have checked the packet before, so we do not check again. */
3320 af
= sctp_get_af_specific(param_type2af(addr_param
->p
.type
));
3321 af
->from_addr_param(&addr
, addr_param
, htons(bp
->port
), 0);
3323 switch (asconf_param
->param_hdr
.type
) {
3324 case SCTP_PARAM_ADD_IP
:
3325 /* This is always done in BH context with a socket lock
3326 * held, so the list can not change.
3329 list_for_each_entry(saddr
, &bp
->address_list
, list
) {
3330 if (sctp_cmp_addr_exact(&saddr
->a
, &addr
))
3331 saddr
->state
= SCTP_ADDR_SRC
;
3334 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3336 sctp_transport_dst_release(transport
);
3339 case SCTP_PARAM_DEL_IP
:
3341 sctp_del_bind_addr(bp
, &addr
);
3342 if (asoc
->asconf_addr_del_pending
!= NULL
&&
3343 sctp_cmp_addr_exact(asoc
->asconf_addr_del_pending
, &addr
)) {
3344 kfree(asoc
->asconf_addr_del_pending
);
3345 asoc
->asconf_addr_del_pending
= NULL
;
3348 list_for_each_entry(transport
, &asoc
->peer
.transport_addr_list
,
3350 sctp_transport_dst_release(transport
);
3358 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3359 * for the given asconf parameter. If there is no response for this parameter,
3360 * return the error code based on the third argument 'no_err'.
3362 * A7) If an error response is received for a TLV parameter, all TLVs with no
3363 * response before the failed TLV are considered successful if not reported.
3364 * All TLVs after the failed response are considered unsuccessful unless a
3365 * specific success indication is present for the parameter.
3367 static __be16
sctp_get_asconf_response(struct sctp_chunk
*asconf_ack
,
3368 struct sctp_addip_param
*asconf_param
,
3371 struct sctp_addip_param
*asconf_ack_param
;
3372 struct sctp_errhdr
*err_param
;
3378 err_code
= SCTP_ERROR_NO_ERROR
;
3380 err_code
= SCTP_ERROR_REQ_REFUSED
;
3382 asconf_ack_len
= ntohs(asconf_ack
->chunk_hdr
->length
) -
3383 sizeof(struct sctp_chunkhdr
);
3385 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3386 * the first asconf_ack parameter.
3388 length
= sizeof(struct sctp_addiphdr
);
3389 asconf_ack_param
= (struct sctp_addip_param
*)(asconf_ack
->skb
->data
+
3391 asconf_ack_len
-= length
;
3393 while (asconf_ack_len
> 0) {
3394 if (asconf_ack_param
->crr_id
== asconf_param
->crr_id
) {
3395 switch (asconf_ack_param
->param_hdr
.type
) {
3396 case SCTP_PARAM_SUCCESS_REPORT
:
3397 return SCTP_ERROR_NO_ERROR
;
3398 case SCTP_PARAM_ERR_CAUSE
:
3399 length
= sizeof(*asconf_ack_param
);
3400 err_param
= (void *)asconf_ack_param
+ length
;
3401 asconf_ack_len
-= length
;
3402 if (asconf_ack_len
> 0)
3403 return err_param
->cause
;
3405 return SCTP_ERROR_INV_PARAM
;
3408 return SCTP_ERROR_INV_PARAM
;
3412 length
= ntohs(asconf_ack_param
->param_hdr
.length
);
3413 asconf_ack_param
= (void *)asconf_ack_param
+ length
;
3414 asconf_ack_len
-= length
;
3420 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3421 int sctp_process_asconf_ack(struct sctp_association
*asoc
,
3422 struct sctp_chunk
*asconf_ack
)
3424 struct sctp_chunk
*asconf
= asoc
->addip_last_asconf
;
3425 struct sctp_addip_param
*asconf_param
;
3426 __be16 err_code
= SCTP_ERROR_NO_ERROR
;
3427 union sctp_addr_param
*addr_param
;
3428 int asconf_len
= asconf
->skb
->len
;
3429 int all_param_pass
= 0;
3434 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3435 * a pointer to address parameter.
3437 length
= sizeof(struct sctp_addip_chunk
);
3438 addr_param
= (union sctp_addr_param
*)(asconf
->skb
->data
+ length
);
3439 asconf_len
-= length
;
3441 /* Skip the address parameter in the last asconf sent and store a
3442 * pointer to the first asconf parameter.
3444 length
= ntohs(addr_param
->p
.length
);
3445 asconf_param
= (void *)addr_param
+ length
;
3446 asconf_len
-= length
;
3449 * A8) If there is no response(s) to specific TLV parameter(s), and no
3450 * failures are indicated, then all request(s) are considered
3453 if (asconf_ack
->skb
->len
== sizeof(struct sctp_addiphdr
))
3456 /* Process the TLVs contained in the last sent ASCONF chunk. */
3457 while (asconf_len
> 0) {
3459 err_code
= SCTP_ERROR_NO_ERROR
;
3461 err_code
= sctp_get_asconf_response(asconf_ack
,
3464 if (no_err
&& (SCTP_ERROR_NO_ERROR
!= err_code
))
3469 case SCTP_ERROR_NO_ERROR
:
3470 sctp_asconf_param_success(asoc
, asconf_param
);
3473 case SCTP_ERROR_RSRC_LOW
:
3477 case SCTP_ERROR_UNKNOWN_PARAM
:
3478 /* Disable sending this type of asconf parameter in
3481 asoc
->peer
.addip_disabled_mask
|=
3482 asconf_param
->param_hdr
.type
;
3485 case SCTP_ERROR_REQ_REFUSED
:
3486 case SCTP_ERROR_DEL_LAST_IP
:
3487 case SCTP_ERROR_DEL_SRC_IP
:
3492 /* Skip the processed asconf parameter and move to the next
3495 length
= ntohs(asconf_param
->param_hdr
.length
);
3496 asconf_param
= (void *)asconf_param
+ length
;
3497 asconf_len
-= length
;
3500 if (no_err
&& asoc
->src_out_of_asoc_ok
) {
3501 asoc
->src_out_of_asoc_ok
= 0;
3502 sctp_transport_immediate_rtx(asoc
->peer
.primary_path
);
3505 /* Free the cached last sent asconf chunk. */
3506 list_del_init(&asconf
->transmitted_list
);
3507 sctp_chunk_free(asconf
);
3508 asoc
->addip_last_asconf
= NULL
;
3513 /* Make a FWD TSN chunk. */
3514 struct sctp_chunk
*sctp_make_fwdtsn(const struct sctp_association
*asoc
,
3515 __u32 new_cum_tsn
, size_t nstreams
,
3516 struct sctp_fwdtsn_skip
*skiplist
)
3518 struct sctp_chunk
*retval
= NULL
;
3519 struct sctp_fwdtsn_hdr ftsn_hdr
;
3520 struct sctp_fwdtsn_skip skip
;
3524 hint
= (nstreams
+ 1) * sizeof(__u32
);
3526 retval
= sctp_make_control(asoc
, SCTP_CID_FWD_TSN
, 0, hint
, GFP_ATOMIC
);
3531 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3532 retval
->subh
.fwdtsn_hdr
=
3533 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3535 for (i
= 0; i
< nstreams
; i
++) {
3536 skip
.stream
= skiplist
[i
].stream
;
3537 skip
.ssn
= skiplist
[i
].ssn
;
3538 sctp_addto_chunk(retval
, sizeof(skip
), &skip
);
3544 struct sctp_chunk
*sctp_make_ifwdtsn(const struct sctp_association
*asoc
,
3545 __u32 new_cum_tsn
, size_t nstreams
,
3546 struct sctp_ifwdtsn_skip
*skiplist
)
3548 struct sctp_chunk
*retval
= NULL
;
3549 struct sctp_ifwdtsn_hdr ftsn_hdr
;
3552 hint
= (nstreams
+ 1) * sizeof(__u32
);
3554 retval
= sctp_make_control(asoc
, SCTP_CID_I_FWD_TSN
, 0, hint
,
3559 ftsn_hdr
.new_cum_tsn
= htonl(new_cum_tsn
);
3560 retval
->subh
.ifwdtsn_hdr
=
3561 sctp_addto_chunk(retval
, sizeof(ftsn_hdr
), &ftsn_hdr
);
3563 sctp_addto_chunk(retval
, nstreams
* sizeof(skiplist
[0]), skiplist
);
3568 /* RE-CONFIG 3.1 (RE-CONFIG chunk)
3570 * 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
3571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3572 * | Type = 130 | Chunk Flags | Chunk Length |
3573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3575 * / Re-configuration Parameter /
3577 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3579 * / Re-configuration Parameter (optional) /
3581 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3583 static struct sctp_chunk
*sctp_make_reconf(const struct sctp_association
*asoc
,
3586 struct sctp_reconf_chunk
*reconf
;
3587 struct sctp_chunk
*retval
;
3589 retval
= sctp_make_control(asoc
, SCTP_CID_RECONF
, 0, length
,
3594 reconf
= (struct sctp_reconf_chunk
*)retval
->chunk_hdr
;
3595 retval
->param_hdr
.v
= reconf
->params
;
3600 /* RE-CONFIG 4.1 (STREAM OUT RESET)
3602 * 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
3603 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3604 * | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
3605 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3606 * | Re-configuration Request Sequence Number |
3607 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3608 * | Re-configuration Response Sequence Number |
3609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3610 * | Sender's Last Assigned TSN |
3611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3612 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3615 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3616 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3617 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3619 * RE-CONFIG 4.2 (STREAM IN RESET)
3621 * 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
3622 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3623 * | Parameter Type = 14 | Parameter Length = 8 + 2 * N |
3624 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3625 * | Re-configuration Request Sequence Number |
3626 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3627 * | Stream Number 1 (optional) | Stream Number 2 (optional) |
3628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3631 * | Stream Number N-1 (optional) | Stream Number N (optional) |
3632 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3634 struct sctp_chunk
*sctp_make_strreset_req(
3635 const struct sctp_association
*asoc
,
3636 __u16 stream_num
, __be16
*stream_list
,
3639 __u16 stream_len
= stream_num
* sizeof(__u16
);
3640 struct sctp_strreset_outreq outreq
;
3641 struct sctp_strreset_inreq inreq
;
3642 struct sctp_chunk
*retval
;
3643 __u16 outlen
, inlen
;
3645 outlen
= (sizeof(outreq
) + stream_len
) * out
;
3646 inlen
= (sizeof(inreq
) + stream_len
) * in
;
3648 retval
= sctp_make_reconf(asoc
, outlen
+ inlen
);
3653 outreq
.param_hdr
.type
= SCTP_PARAM_RESET_OUT_REQUEST
;
3654 outreq
.param_hdr
.length
= htons(outlen
);
3655 outreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3656 outreq
.response_seq
= htonl(asoc
->strreset_inseq
- 1);
3657 outreq
.send_reset_at_tsn
= htonl(asoc
->next_tsn
- 1);
3659 sctp_addto_chunk(retval
, sizeof(outreq
), &outreq
);
3662 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3666 inreq
.param_hdr
.type
= SCTP_PARAM_RESET_IN_REQUEST
;
3667 inreq
.param_hdr
.length
= htons(inlen
);
3668 inreq
.request_seq
= htonl(asoc
->strreset_outseq
+ out
);
3670 sctp_addto_chunk(retval
, sizeof(inreq
), &inreq
);
3673 sctp_addto_chunk(retval
, stream_len
, stream_list
);
3679 /* RE-CONFIG 4.3 (SSN/TSN RESET ALL)
3681 * 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
3682 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3683 * | Parameter Type = 15 | Parameter Length = 8 |
3684 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3685 * | Re-configuration Request Sequence Number |
3686 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3688 struct sctp_chunk
*sctp_make_strreset_tsnreq(
3689 const struct sctp_association
*asoc
)
3691 struct sctp_strreset_tsnreq tsnreq
;
3692 __u16 length
= sizeof(tsnreq
);
3693 struct sctp_chunk
*retval
;
3695 retval
= sctp_make_reconf(asoc
, length
);
3699 tsnreq
.param_hdr
.type
= SCTP_PARAM_RESET_TSN_REQUEST
;
3700 tsnreq
.param_hdr
.length
= htons(length
);
3701 tsnreq
.request_seq
= htonl(asoc
->strreset_outseq
);
3703 sctp_addto_chunk(retval
, sizeof(tsnreq
), &tsnreq
);
3708 /* RE-CONFIG 4.5/4.6 (ADD STREAM)
3710 * 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
3711 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3712 * | Parameter Type = 17 | Parameter Length = 12 |
3713 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3714 * | Re-configuration Request Sequence Number |
3715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3716 * | Number of new streams | Reserved |
3717 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3719 struct sctp_chunk
*sctp_make_strreset_addstrm(
3720 const struct sctp_association
*asoc
,
3721 __u16 out
, __u16 in
)
3723 struct sctp_strreset_addstrm addstrm
;
3724 __u16 size
= sizeof(addstrm
);
3725 struct sctp_chunk
*retval
;
3727 retval
= sctp_make_reconf(asoc
, (!!out
+ !!in
) * size
);
3732 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_OUT_STREAMS
;
3733 addstrm
.param_hdr
.length
= htons(size
);
3734 addstrm
.number_of_streams
= htons(out
);
3735 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
);
3736 addstrm
.reserved
= 0;
3738 sctp_addto_chunk(retval
, size
, &addstrm
);
3742 addstrm
.param_hdr
.type
= SCTP_PARAM_RESET_ADD_IN_STREAMS
;
3743 addstrm
.param_hdr
.length
= htons(size
);
3744 addstrm
.number_of_streams
= htons(in
);
3745 addstrm
.request_seq
= htonl(asoc
->strreset_outseq
+ !!out
);
3746 addstrm
.reserved
= 0;
3748 sctp_addto_chunk(retval
, size
, &addstrm
);
3754 /* RE-CONFIG 4.4 (RESP)
3756 * 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
3757 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3758 * | Parameter Type = 16 | Parameter Length |
3759 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3760 * | Re-configuration Response Sequence Number |
3761 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3763 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3765 struct sctp_chunk
*sctp_make_strreset_resp(const struct sctp_association
*asoc
,
3766 __u32 result
, __u32 sn
)
3768 struct sctp_strreset_resp resp
;
3769 __u16 length
= sizeof(resp
);
3770 struct sctp_chunk
*retval
;
3772 retval
= sctp_make_reconf(asoc
, length
);
3776 resp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3777 resp
.param_hdr
.length
= htons(length
);
3778 resp
.response_seq
= htonl(sn
);
3779 resp
.result
= htonl(result
);
3781 sctp_addto_chunk(retval
, sizeof(resp
), &resp
);
3786 /* RE-CONFIG 4.4 OPTIONAL (TSNRESP)
3788 * 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
3789 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3790 * | Parameter Type = 16 | Parameter Length |
3791 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3792 * | Re-configuration Response Sequence Number |
3793 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3795 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3796 * | Sender's Next TSN (optional) |
3797 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3798 * | Receiver's Next TSN (optional) |
3799 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3801 struct sctp_chunk
*sctp_make_strreset_tsnresp(struct sctp_association
*asoc
,
3802 __u32 result
, __u32 sn
,
3806 struct sctp_strreset_resptsn tsnresp
;
3807 __u16 length
= sizeof(tsnresp
);
3808 struct sctp_chunk
*retval
;
3810 retval
= sctp_make_reconf(asoc
, length
);
3814 tsnresp
.param_hdr
.type
= SCTP_PARAM_RESET_RESPONSE
;
3815 tsnresp
.param_hdr
.length
= htons(length
);
3817 tsnresp
.response_seq
= htonl(sn
);
3818 tsnresp
.result
= htonl(result
);
3819 tsnresp
.senders_next_tsn
= htonl(sender_tsn
);
3820 tsnresp
.receivers_next_tsn
= htonl(receiver_tsn
);
3822 sctp_addto_chunk(retval
, sizeof(tsnresp
), &tsnresp
);
3827 bool sctp_verify_reconf(const struct sctp_association
*asoc
,
3828 struct sctp_chunk
*chunk
,
3829 struct sctp_paramhdr
**errp
)
3831 struct sctp_reconf_chunk
*hdr
;
3832 union sctp_params param
;
3836 hdr
= (struct sctp_reconf_chunk
*)chunk
->chunk_hdr
;
3837 sctp_walk_params(param
, hdr
, params
) {
3838 __u16 length
= ntohs(param
.p
->length
);
3843 switch (param
.p
->type
) {
3844 case SCTP_PARAM_RESET_OUT_REQUEST
:
3845 if (length
< sizeof(struct sctp_strreset_outreq
) ||
3846 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3847 last
!= SCTP_PARAM_RESET_IN_REQUEST
))
3850 case SCTP_PARAM_RESET_IN_REQUEST
:
3851 if (length
< sizeof(struct sctp_strreset_inreq
) ||
3852 (last
&& last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3855 case SCTP_PARAM_RESET_RESPONSE
:
3856 if ((length
!= sizeof(struct sctp_strreset_resp
) &&
3857 length
!= sizeof(struct sctp_strreset_resptsn
)) ||
3858 (last
&& last
!= SCTP_PARAM_RESET_RESPONSE
&&
3859 last
!= SCTP_PARAM_RESET_OUT_REQUEST
))
3862 case SCTP_PARAM_RESET_TSN_REQUEST
:
3864 sizeof(struct sctp_strreset_tsnreq
) || last
)
3867 case SCTP_PARAM_RESET_ADD_IN_STREAMS
:
3868 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3869 (last
&& last
!= SCTP_PARAM_RESET_ADD_OUT_STREAMS
))
3872 case SCTP_PARAM_RESET_ADD_OUT_STREAMS
:
3873 if (length
!= sizeof(struct sctp_strreset_addstrm
) ||
3874 (last
&& last
!= SCTP_PARAM_RESET_ADD_IN_STREAMS
))
3881 last
= param
.p
->type
;