1 /* SCTP kernel implementation
2 * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
4 * This file is part of the SCTP kernel implementation
6 * This SCTP implementation is free software;
7 * you can redistribute it and/or modify it under the terms of
8 * the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This SCTP implementation is distributed in the hope that it
13 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
14 * ************************
15 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16 * See the GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with GNU CC; see the file COPYING. If not, see
20 * <http://www.gnu.org/licenses/>.
22 * Please send any bug reports or fixes you make to the
24 * lksctp developers <linux-sctp@vger.kernel.org>
26 * Written or modified by:
27 * Vlad Yasevich <vladislav.yasevich@hp.com>
30 #include <crypto/hash.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/scatterlist.h>
34 #include <net/sctp/sctp.h>
35 #include <net/sctp/auth.h>
37 static struct sctp_hmac sctp_hmac_list[SCTP_AUTH_NUM_HMACS] = {
39 /* id 0 is reserved. as all 0 */
40 .hmac_id = SCTP_AUTH_HMAC_ID_RESERVED_0,
43 .hmac_id = SCTP_AUTH_HMAC_ID_SHA1,
44 .hmac_name = "hmac(sha1)",
45 .hmac_len = SCTP_SHA1_SIG_SIZE,
48 /* id 2 is reserved as well */
49 .hmac_id = SCTP_AUTH_HMAC_ID_RESERVED_2,
51 #if IS_ENABLED(CONFIG_CRYPTO_SHA256)
53 .hmac_id = SCTP_AUTH_HMAC_ID_SHA256,
54 .hmac_name = "hmac(sha256)",
55 .hmac_len = SCTP_SHA256_SIG_SIZE,
61 void sctp_auth_key_put(struct sctp_auth_bytes *key)
66 if (refcount_dec_and_test(&key->refcnt)) {
68 SCTP_DBG_OBJCNT_DEC(keys);
72 /* Create a new key structure of a given length */
73 static struct sctp_auth_bytes *sctp_auth_create_key(__u32 key_len, gfp_t gfp)
75 struct sctp_auth_bytes *key;
77 /* Verify that we are not going to overflow INT_MAX */
78 if (key_len > (INT_MAX - sizeof(struct sctp_auth_bytes)))
81 /* Allocate the shared key */
82 key = kmalloc(sizeof(struct sctp_auth_bytes) + key_len, gfp);
87 refcount_set(&key->refcnt, 1);
88 SCTP_DBG_OBJCNT_INC(keys);
93 /* Create a new shared key container with a give key id */
94 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp)
96 struct sctp_shared_key *new;
98 /* Allocate the shared key container */
99 new = kzalloc(sizeof(struct sctp_shared_key), gfp);
103 INIT_LIST_HEAD(&new->key_list);
104 refcount_set(&new->refcnt, 1);
105 new->key_id = key_id;
110 /* Free the shared key structure */
111 static void sctp_auth_shkey_destroy(struct sctp_shared_key *sh_key)
113 BUG_ON(!list_empty(&sh_key->key_list));
114 sctp_auth_key_put(sh_key->key);
119 void sctp_auth_shkey_release(struct sctp_shared_key *sh_key)
121 if (refcount_dec_and_test(&sh_key->refcnt))
122 sctp_auth_shkey_destroy(sh_key);
125 void sctp_auth_shkey_hold(struct sctp_shared_key *sh_key)
127 refcount_inc(&sh_key->refcnt);
130 /* Destroy the entire key list. This is done during the
131 * associon and endpoint free process.
133 void sctp_auth_destroy_keys(struct list_head *keys)
135 struct sctp_shared_key *ep_key;
136 struct sctp_shared_key *tmp;
138 if (list_empty(keys))
141 key_for_each_safe(ep_key, tmp, keys) {
142 list_del_init(&ep_key->key_list);
143 sctp_auth_shkey_release(ep_key);
147 /* Compare two byte vectors as numbers. Return values
149 * 0 - vectors are equal
150 * < 0 - vector 1 is smaller than vector2
151 * > 0 - vector 1 is greater than vector2
154 * This is performed by selecting the numerically smaller key vector...
155 * If the key vectors are equal as numbers but differ in length ...
156 * the shorter vector is considered smaller
158 * Examples (with small values):
159 * 000123456789 > 123456789 (first number is longer)
160 * 000123456789 < 234567891 (second number is larger numerically)
161 * 123456789 > 2345678 (first number is both larger & longer)
163 static int sctp_auth_compare_vectors(struct sctp_auth_bytes *vector1,
164 struct sctp_auth_bytes *vector2)
170 diff = vector1->len - vector2->len;
172 longer = (diff > 0) ? vector1->data : vector2->data;
174 /* Check to see if the longer number is
175 * lead-zero padded. If it is not, it
176 * is automatically larger numerically.
178 for (i = 0; i < abs(diff); i++) {
184 /* lengths are the same, compare numbers */
185 return memcmp(vector1->data, vector2->data, vector1->len);
189 * Create a key vector as described in SCTP-AUTH, Section 6.1
190 * The RANDOM parameter, the CHUNKS parameter and the HMAC-ALGO
191 * parameter sent by each endpoint are concatenated as byte vectors.
192 * These parameters include the parameter type, parameter length, and
193 * the parameter value, but padding is omitted; all padding MUST be
194 * removed from this concatenation before proceeding with further
195 * computation of keys. Parameters which were not sent are simply
196 * omitted from the concatenation process. The resulting two vectors
197 * are called the two key vectors.
199 static struct sctp_auth_bytes *sctp_auth_make_key_vector(
200 struct sctp_random_param *random,
201 struct sctp_chunks_param *chunks,
202 struct sctp_hmac_algo_param *hmacs,
205 struct sctp_auth_bytes *new;
208 __u16 random_len, hmacs_len, chunks_len = 0;
210 random_len = ntohs(random->param_hdr.length);
211 hmacs_len = ntohs(hmacs->param_hdr.length);
213 chunks_len = ntohs(chunks->param_hdr.length);
215 len = random_len + hmacs_len + chunks_len;
217 new = sctp_auth_create_key(len, gfp);
221 memcpy(new->data, random, random_len);
222 offset += random_len;
225 memcpy(new->data + offset, chunks, chunks_len);
226 offset += chunks_len;
229 memcpy(new->data + offset, hmacs, hmacs_len);
235 /* Make a key vector based on our local parameters */
236 static struct sctp_auth_bytes *sctp_auth_make_local_vector(
237 const struct sctp_association *asoc,
240 return sctp_auth_make_key_vector(
241 (struct sctp_random_param *)asoc->c.auth_random,
242 (struct sctp_chunks_param *)asoc->c.auth_chunks,
243 (struct sctp_hmac_algo_param *)asoc->c.auth_hmacs, gfp);
246 /* Make a key vector based on peer's parameters */
247 static struct sctp_auth_bytes *sctp_auth_make_peer_vector(
248 const struct sctp_association *asoc,
251 return sctp_auth_make_key_vector(asoc->peer.peer_random,
252 asoc->peer.peer_chunks,
253 asoc->peer.peer_hmacs,
258 /* Set the value of the association shared key base on the parameters
259 * given. The algorithm is:
260 * From the endpoint pair shared keys and the key vectors the
261 * association shared keys are computed. This is performed by selecting
262 * the numerically smaller key vector and concatenating it to the
263 * endpoint pair shared key, and then concatenating the numerically
264 * larger key vector to that. The result of the concatenation is the
265 * association shared key.
267 static struct sctp_auth_bytes *sctp_auth_asoc_set_secret(
268 struct sctp_shared_key *ep_key,
269 struct sctp_auth_bytes *first_vector,
270 struct sctp_auth_bytes *last_vector,
273 struct sctp_auth_bytes *secret;
277 auth_len = first_vector->len + last_vector->len;
279 auth_len += ep_key->key->len;
281 secret = sctp_auth_create_key(auth_len, gfp);
286 memcpy(secret->data, ep_key->key->data, ep_key->key->len);
287 offset += ep_key->key->len;
290 memcpy(secret->data + offset, first_vector->data, first_vector->len);
291 offset += first_vector->len;
293 memcpy(secret->data + offset, last_vector->data, last_vector->len);
298 /* Create an association shared key. Follow the algorithm
299 * described in SCTP-AUTH, Section 6.1
301 static struct sctp_auth_bytes *sctp_auth_asoc_create_secret(
302 const struct sctp_association *asoc,
303 struct sctp_shared_key *ep_key,
306 struct sctp_auth_bytes *local_key_vector;
307 struct sctp_auth_bytes *peer_key_vector;
308 struct sctp_auth_bytes *first_vector,
310 struct sctp_auth_bytes *secret = NULL;
314 /* Now we need to build the key vectors
315 * SCTP-AUTH , Section 6.1
316 * The RANDOM parameter, the CHUNKS parameter and the HMAC-ALGO
317 * parameter sent by each endpoint are concatenated as byte vectors.
318 * These parameters include the parameter type, parameter length, and
319 * the parameter value, but padding is omitted; all padding MUST be
320 * removed from this concatenation before proceeding with further
321 * computation of keys. Parameters which were not sent are simply
322 * omitted from the concatenation process. The resulting two vectors
323 * are called the two key vectors.
326 local_key_vector = sctp_auth_make_local_vector(asoc, gfp);
327 peer_key_vector = sctp_auth_make_peer_vector(asoc, gfp);
329 if (!peer_key_vector || !local_key_vector)
332 /* Figure out the order in which the key_vectors will be
333 * added to the endpoint shared key.
334 * SCTP-AUTH, Section 6.1:
335 * This is performed by selecting the numerically smaller key
336 * vector and concatenating it to the endpoint pair shared
337 * key, and then concatenating the numerically larger key
338 * vector to that. If the key vectors are equal as numbers
339 * but differ in length, then the concatenation order is the
340 * endpoint shared key, followed by the shorter key vector,
341 * followed by the longer key vector. Otherwise, the key
342 * vectors are identical, and may be concatenated to the
343 * endpoint pair key in any order.
345 cmp = sctp_auth_compare_vectors(local_key_vector,
348 first_vector = local_key_vector;
349 last_vector = peer_key_vector;
351 first_vector = peer_key_vector;
352 last_vector = local_key_vector;
355 secret = sctp_auth_asoc_set_secret(ep_key, first_vector, last_vector,
358 sctp_auth_key_put(local_key_vector);
359 sctp_auth_key_put(peer_key_vector);
365 * Populate the association overlay list with the list
368 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
369 struct sctp_association *asoc,
372 struct sctp_shared_key *sh_key;
373 struct sctp_shared_key *new;
375 BUG_ON(!list_empty(&asoc->endpoint_shared_keys));
377 key_for_each(sh_key, &ep->endpoint_shared_keys) {
378 new = sctp_auth_shkey_create(sh_key->key_id, gfp);
382 new->key = sh_key->key;
383 sctp_auth_key_hold(new->key);
384 list_add(&new->key_list, &asoc->endpoint_shared_keys);
390 sctp_auth_destroy_keys(&asoc->endpoint_shared_keys);
395 /* Public interface to create the association shared key.
396 * See code above for the algorithm.
398 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp)
400 struct sctp_auth_bytes *secret;
401 struct sctp_shared_key *ep_key;
402 struct sctp_chunk *chunk;
404 /* If we don't support AUTH, or peer is not capable
405 * we don't need to do anything.
407 if (!asoc->ep->auth_enable || !asoc->peer.auth_capable)
410 /* If the key_id is non-zero and we couldn't find an
411 * endpoint pair shared key, we can't compute the
413 * For key_id 0, endpoint pair shared key is a NULL key.
415 ep_key = sctp_auth_get_shkey(asoc, asoc->active_key_id);
418 secret = sctp_auth_asoc_create_secret(asoc, ep_key, gfp);
422 sctp_auth_key_put(asoc->asoc_shared_key);
423 asoc->asoc_shared_key = secret;
424 asoc->shkey = ep_key;
426 /* Update send queue in case any chunk already in there now
427 * needs authenticating
429 list_for_each_entry(chunk, &asoc->outqueue.out_chunk_list, list) {
430 if (sctp_auth_send_cid(chunk->chunk_hdr->type, asoc)) {
433 chunk->shkey = asoc->shkey;
434 sctp_auth_shkey_hold(chunk->shkey);
443 /* Find the endpoint pair shared key based on the key_id */
444 struct sctp_shared_key *sctp_auth_get_shkey(
445 const struct sctp_association *asoc,
448 struct sctp_shared_key *key;
450 /* First search associations set of endpoint pair shared keys */
451 key_for_each(key, &asoc->endpoint_shared_keys) {
452 if (key->key_id == key_id) {
453 if (!key->deactivated)
463 * Initialize all the possible digest transforms that we can use. Right now
464 * now, the supported digests are SHA1 and SHA256. We do this here once
465 * because of the restrictiong that transforms may only be allocated in
466 * user context. This forces us to pre-allocated all possible transforms
467 * at the endpoint init time.
469 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp)
471 struct crypto_shash *tfm = NULL;
474 /* If AUTH extension is disabled, we are done */
475 if (!ep->auth_enable) {
476 ep->auth_hmacs = NULL;
480 /* If the transforms are already allocated, we are done */
484 /* Allocated the array of pointers to transorms */
485 ep->auth_hmacs = kcalloc(SCTP_AUTH_NUM_HMACS,
486 sizeof(struct crypto_shash *),
491 for (id = 0; id < SCTP_AUTH_NUM_HMACS; id++) {
493 /* See is we support the id. Supported IDs have name and
494 * length fields set, so that we can allocated and use
495 * them. We can safely just check for name, for without the
496 * name, we can't allocate the TFM.
498 if (!sctp_hmac_list[id].hmac_name)
501 /* If this TFM has been allocated, we are all set */
502 if (ep->auth_hmacs[id])
505 /* Allocate the ID */
506 tfm = crypto_alloc_shash(sctp_hmac_list[id].hmac_name, 0, 0);
510 ep->auth_hmacs[id] = tfm;
516 /* Clean up any successful allocations */
517 sctp_auth_destroy_hmacs(ep->auth_hmacs);
518 ep->auth_hmacs = NULL;
522 /* Destroy the hmac tfm array */
523 void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[])
530 for (i = 0; i < SCTP_AUTH_NUM_HMACS; i++) {
531 crypto_free_shash(auth_hmacs[i]);
537 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id)
539 return &sctp_hmac_list[hmac_id];
542 /* Get an hmac description information that we can use to build
545 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc)
547 struct sctp_hmac_algo_param *hmacs;
552 /* If we have a default entry, use it */
553 if (asoc->default_hmac_id)
554 return &sctp_hmac_list[asoc->default_hmac_id];
556 /* Since we do not have a default entry, find the first entry
557 * we support and return that. Do not cache that id.
559 hmacs = asoc->peer.peer_hmacs;
563 n_elt = (ntohs(hmacs->param_hdr.length) -
564 sizeof(struct sctp_paramhdr)) >> 1;
565 for (i = 0; i < n_elt; i++) {
566 id = ntohs(hmacs->hmac_ids[i]);
568 /* Check the id is in the supported range. And
569 * see if we support the id. Supported IDs have name and
570 * length fields set, so that we can allocate and use
571 * them. We can safely just check for name, for without the
572 * name, we can't allocate the TFM.
574 if (id > SCTP_AUTH_HMAC_ID_MAX ||
575 !sctp_hmac_list[id].hmac_name) {
586 return &sctp_hmac_list[id];
589 static int __sctp_auth_find_hmacid(__be16 *hmacs, int n_elts, __be16 hmac_id)
594 for (i = 0; i < n_elts; i++) {
595 if (hmac_id == hmacs[i]) {
604 /* See if the HMAC_ID is one that we claim as supported */
605 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
608 struct sctp_hmac_algo_param *hmacs;
614 hmacs = (struct sctp_hmac_algo_param *)asoc->c.auth_hmacs;
615 n_elt = (ntohs(hmacs->param_hdr.length) -
616 sizeof(struct sctp_paramhdr)) >> 1;
618 return __sctp_auth_find_hmacid(hmacs->hmac_ids, n_elt, hmac_id);
622 /* Cache the default HMAC id. This to follow this text from SCTP-AUTH:
624 * The receiver of a HMAC-ALGO parameter SHOULD use the first listed
625 * algorithm it supports.
627 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
628 struct sctp_hmac_algo_param *hmacs)
630 struct sctp_endpoint *ep;
635 /* if the default id is already set, use it */
636 if (asoc->default_hmac_id)
639 n_params = (ntohs(hmacs->param_hdr.length) -
640 sizeof(struct sctp_paramhdr)) >> 1;
642 for (i = 0; i < n_params; i++) {
643 id = ntohs(hmacs->hmac_ids[i]);
645 /* Check the id is in the supported range */
646 if (id > SCTP_AUTH_HMAC_ID_MAX)
649 /* If this TFM has been allocated, use this id */
650 if (ep->auth_hmacs[id]) {
651 asoc->default_hmac_id = id;
658 /* Check to see if the given chunk is supposed to be authenticated */
659 static int __sctp_auth_cid(enum sctp_cid chunk, struct sctp_chunks_param *param)
665 if (!param || param->param_hdr.length == 0)
668 len = ntohs(param->param_hdr.length) - sizeof(struct sctp_paramhdr);
670 /* SCTP-AUTH, Section 3.2
671 * The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH
672 * chunks MUST NOT be listed in the CHUNKS parameter. However, if
673 * a CHUNKS parameter is received then the types for INIT, INIT-ACK,
674 * SHUTDOWN-COMPLETE and AUTH chunks MUST be ignored.
676 for (i = 0; !found && i < len; i++) {
677 switch (param->chunks[i]) {
679 case SCTP_CID_INIT_ACK:
680 case SCTP_CID_SHUTDOWN_COMPLETE:
685 if (param->chunks[i] == chunk)
694 /* Check if peer requested that this chunk is authenticated */
695 int sctp_auth_send_cid(enum sctp_cid chunk, const struct sctp_association *asoc)
700 if (!asoc->ep->auth_enable || !asoc->peer.auth_capable)
703 return __sctp_auth_cid(chunk, asoc->peer.peer_chunks);
706 /* Check if we requested that peer authenticate this chunk. */
707 int sctp_auth_recv_cid(enum sctp_cid chunk, const struct sctp_association *asoc)
712 if (!asoc->ep->auth_enable)
715 return __sctp_auth_cid(chunk,
716 (struct sctp_chunks_param *)asoc->c.auth_chunks);
719 /* SCTP-AUTH: Section 6.2:
720 * The sender MUST calculate the MAC as described in RFC2104 [2] using
721 * the hash function H as described by the MAC Identifier and the shared
722 * association key K based on the endpoint pair shared key described by
723 * the shared key identifier. The 'data' used for the computation of
724 * the AUTH-chunk is given by the AUTH chunk with its HMAC field set to
725 * zero (as shown in Figure 6) followed by all chunks that are placed
726 * after the AUTH chunk in the SCTP packet.
728 void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
729 struct sk_buff *skb, struct sctp_auth_chunk *auth,
730 struct sctp_shared_key *ep_key, gfp_t gfp)
732 struct sctp_auth_bytes *asoc_key;
733 struct crypto_shash *tfm;
734 __u16 key_id, hmac_id;
739 /* Extract the info we need:
743 key_id = ntohs(auth->auth_hdr.shkey_id);
744 hmac_id = ntohs(auth->auth_hdr.hmac_id);
746 if (key_id == asoc->active_key_id)
747 asoc_key = asoc->asoc_shared_key;
749 /* ep_key can't be NULL here */
750 asoc_key = sctp_auth_asoc_create_secret(asoc, ep_key, gfp);
757 /* set up scatter list */
758 end = skb_tail_pointer(skb);
760 tfm = asoc->ep->auth_hmacs[hmac_id];
762 digest = auth->auth_hdr.hmac;
763 if (crypto_shash_setkey(tfm, &asoc_key->data[0], asoc_key->len))
767 SHASH_DESC_ON_STACK(desc, tfm);
771 crypto_shash_digest(desc, (u8 *)auth,
772 end - (unsigned char *)auth, digest);
773 shash_desc_zero(desc);
778 sctp_auth_key_put(asoc_key);
783 /* Add a chunk to the endpoint authenticated chunk list */
784 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id)
786 struct sctp_chunks_param *p = ep->auth_chunk_list;
790 /* If this chunk is already specified, we are done */
791 if (__sctp_auth_cid(chunk_id, p))
794 /* Check if we can add this chunk to the array */
795 param_len = ntohs(p->param_hdr.length);
796 nchunks = param_len - sizeof(struct sctp_paramhdr);
797 if (nchunks == SCTP_NUM_CHUNK_TYPES)
800 p->chunks[nchunks] = chunk_id;
801 p->param_hdr.length = htons(param_len + 1);
805 /* Add hmac identifires to the endpoint list of supported hmac ids */
806 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
807 struct sctp_hmacalgo *hmacs)
813 /* Scan the list looking for unsupported id. Also make sure that
816 for (i = 0; i < hmacs->shmac_num_idents; i++) {
817 id = hmacs->shmac_idents[i];
819 if (id > SCTP_AUTH_HMAC_ID_MAX)
822 if (SCTP_AUTH_HMAC_ID_SHA1 == id)
825 if (!sctp_hmac_list[id].hmac_name)
832 for (i = 0; i < hmacs->shmac_num_idents; i++)
833 ep->auth_hmacs_list->hmac_ids[i] =
834 htons(hmacs->shmac_idents[i]);
835 ep->auth_hmacs_list->param_hdr.length =
836 htons(sizeof(struct sctp_paramhdr) +
837 hmacs->shmac_num_idents * sizeof(__u16));
841 /* Set a new shared key on either endpoint or association. If the
842 * the key with a same ID already exists, replace the key (remove the
843 * old key and add a new one).
845 int sctp_auth_set_key(struct sctp_endpoint *ep,
846 struct sctp_association *asoc,
847 struct sctp_authkey *auth_key)
849 struct sctp_shared_key *cur_key, *shkey;
850 struct sctp_auth_bytes *key;
851 struct list_head *sh_keys;
854 /* Try to find the given key id to see if
855 * we are doing a replace, or adding a new key
858 sh_keys = &asoc->endpoint_shared_keys;
860 sh_keys = &ep->endpoint_shared_keys;
862 key_for_each(shkey, sh_keys) {
863 if (shkey->key_id == auth_key->sca_keynumber) {
869 cur_key = sctp_auth_shkey_create(auth_key->sca_keynumber, GFP_KERNEL);
873 /* Create a new key data based on the info passed in */
874 key = sctp_auth_create_key(auth_key->sca_keylength, GFP_KERNEL);
880 memcpy(key->data, &auth_key->sca_key[0], auth_key->sca_keylength);
884 list_add(&cur_key->key_list, sh_keys);
888 list_del_init(&shkey->key_list);
889 sctp_auth_shkey_release(shkey);
890 list_add(&cur_key->key_list, sh_keys);
892 if (asoc && asoc->active_key_id == auth_key->sca_keynumber)
893 sctp_auth_asoc_init_active_key(asoc, GFP_KERNEL);
898 int sctp_auth_set_active_key(struct sctp_endpoint *ep,
899 struct sctp_association *asoc,
902 struct sctp_shared_key *key;
903 struct list_head *sh_keys;
906 /* The key identifier MUST correst to an existing key */
908 sh_keys = &asoc->endpoint_shared_keys;
910 sh_keys = &ep->endpoint_shared_keys;
912 key_for_each(key, sh_keys) {
913 if (key->key_id == key_id) {
919 if (!found || key->deactivated)
923 asoc->active_key_id = key_id;
924 sctp_auth_asoc_init_active_key(asoc, GFP_KERNEL);
926 ep->active_key_id = key_id;
931 int sctp_auth_del_key_id(struct sctp_endpoint *ep,
932 struct sctp_association *asoc,
935 struct sctp_shared_key *key;
936 struct list_head *sh_keys;
939 /* The key identifier MUST NOT be the current active key
940 * The key identifier MUST correst to an existing key
943 if (asoc->active_key_id == key_id)
946 sh_keys = &asoc->endpoint_shared_keys;
948 if (ep->active_key_id == key_id)
951 sh_keys = &ep->endpoint_shared_keys;
954 key_for_each(key, sh_keys) {
955 if (key->key_id == key_id) {
964 /* Delete the shared key */
965 list_del_init(&key->key_list);
966 sctp_auth_shkey_release(key);
971 int sctp_auth_deact_key_id(struct sctp_endpoint *ep,
972 struct sctp_association *asoc, __u16 key_id)
974 struct sctp_shared_key *key;
975 struct list_head *sh_keys;
978 /* The key identifier MUST NOT be the current active key
979 * The key identifier MUST correst to an existing key
982 if (asoc->active_key_id == key_id)
985 sh_keys = &asoc->endpoint_shared_keys;
987 if (ep->active_key_id == key_id)
990 sh_keys = &ep->endpoint_shared_keys;
993 key_for_each(key, sh_keys) {
994 if (key->key_id == key_id) {
1003 /* refcnt == 1 and !list_empty mean it's not being used anywhere
1004 * and deactivated will be set, so it's time to notify userland
1005 * that this shkey can be freed.
1007 if (asoc && !list_empty(&key->key_list) &&
1008 refcount_read(&key->refcnt) == 1) {
1009 struct sctp_ulpevent *ev;
1011 ev = sctp_ulpevent_make_authkey(asoc, key->key_id,
1012 SCTP_AUTH_FREE_KEY, GFP_KERNEL);
1014 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
1017 key->deactivated = 1;