1 /* SCTP kernel implementation
2 * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
3 *
4 * This file is part of the SCTP kernel implementation
5 *
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)
10 * any later version.
11 *
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.
17 *
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/>.
21 *
22 * Please send any bug reports or fixes you make to the
23 * email address(es):
24 * lksctp developers <linux-sctp@vger.kernel.org>
25 *
26 * Written or modified by:
27 * Vlad Yasevich <vladislav.yasevich@hp.com>
28 */
29
30 #ifndef __sctp_auth_h__
31 #define __sctp_auth_h__
32
33 #include <linux/list.h>
34
35 struct sctp_endpoint;
36 struct sctp_association;
37 struct sctp_authkey;
38 struct sctp_hmacalgo;
39 struct crypto_shash;
40
41 /*
42 * Define a generic struct that will hold all the info
43 * necessary for an HMAC transform
44 */
45 struct sctp_hmac {
46 __u16 hmac_id; /* one of the above ids */
47 char *hmac_name; /* name for loading */
48 __u16 hmac_len; /* length of the signature */
49 };
50
51 /* This is generic structure that containst authentication bytes used
52 * as keying material. It's a what is referred to as byte-vector all
53 * over SCTP-AUTH
54 */
55 struct sctp_auth_bytes {
56 atomic_t refcnt;
57 __u32 len;
58 __u8 data[];
59 };
60
61 /* Definition for a shared key, weather endpoint or association */
62 struct sctp_shared_key {
63 struct list_head key_list;
64 __u16 key_id;
65 struct sctp_auth_bytes *key;
66 };
67
68 #define key_for_each(__key, __list_head) \
69 list_for_each_entry(__key, __list_head, key_list)
70
71 #define key_for_each_safe(__key, __tmp, __list_head) \
72 list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
73
sctp_auth_key_hold(struct sctp_auth_bytes * key)74 static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
75 {
76 if (!key)
77 return;
78
79 atomic_inc(&key->refcnt);
80 }
81
82 void sctp_auth_key_put(struct sctp_auth_bytes *key);
83 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
84 void sctp_auth_destroy_keys(struct list_head *keys);
85 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
86 struct sctp_shared_key *sctp_auth_get_shkey(
87 const struct sctp_association *asoc,
88 __u16 key_id);
89 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
90 struct sctp_association *asoc,
91 gfp_t gfp);
92 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
93 void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]);
94 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
95 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
96 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
97 struct sctp_hmac_algo_param *hmacs);
98 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
99 __be16 hmac_id);
100 int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
101 int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
102 void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
103 struct sk_buff *skb,
104 struct sctp_auth_chunk *auth, gfp_t gfp);
105
106 /* API Helpers */
107 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
108 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
109 struct sctp_hmacalgo *hmacs);
110 int sctp_auth_set_key(struct sctp_endpoint *ep,
111 struct sctp_association *asoc,
112 struct sctp_authkey *auth_key);
113 int sctp_auth_set_active_key(struct sctp_endpoint *ep,
114 struct sctp_association *asoc,
115 __u16 key_id);
116 int sctp_auth_del_key_id(struct sctp_endpoint *ep,
117 struct sctp_association *asoc,
118 __u16 key_id);
119
120 #endif
121