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, write to
20 * the Free Software Foundation, 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 *
23 * Please send any bug reports or fixes you make to the
24 * email address(es):
25 * lksctp developers <lksctp-developers@lists.sourceforge.net>
26 *
27 * Or submit a bug report through the following website:
28 * http://www.sf.net/projects/lksctp
29 *
30 * Written or modified by:
31 * Vlad Yasevich <vladislav.yasevich@hp.com>
32 *
33 * Any bugs reported given to us we will try to fix... any fixes shared will
34 * be incorporated into the next SCTP release.
35 */
36
37 #ifndef __sctp_auth_h__
38 #define __sctp_auth_h__
39
40 #include <linux/list.h>
41 #include <linux/crypto.h>
42
43 struct sctp_endpoint;
44 struct sctp_association;
45 struct sctp_authkey;
46 struct sctp_hmacalgo;
47
48 /*
49 * Define a generic struct that will hold all the info
50 * necessary for an HMAC transform
51 */
52 struct sctp_hmac {
53 __u16 hmac_id; /* one of the above ids */
54 char *hmac_name; /* name for loading */
55 __u16 hmac_len; /* length of the signature */
56 };
57
58 /* This is generic structure that containst authentication bytes used
59 * as keying material. It's a what is referred to as byte-vector all
60 * over SCTP-AUTH
61 */
62 struct sctp_auth_bytes {
63 atomic_t refcnt;
64 __u32 len;
65 __u8 data[];
66 };
67
68 /* Definition for a shared key, weather endpoint or association */
69 struct sctp_shared_key {
70 struct list_head key_list;
71 __u16 key_id;
72 struct sctp_auth_bytes *key;
73 };
74
75 #define key_for_each(__key, __list_head) \
76 list_for_each_entry(__key, __list_head, key_list)
77
78 #define key_for_each_safe(__key, __tmp, __list_head) \
79 list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
80
sctp_auth_key_hold(struct sctp_auth_bytes * key)81 static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
82 {
83 if (!key)
84 return;
85
86 atomic_inc(&key->refcnt);
87 }
88
89 void sctp_auth_key_put(struct sctp_auth_bytes *key);
90 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
91 void sctp_auth_destroy_keys(struct list_head *keys);
92 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
93 struct sctp_shared_key *sctp_auth_get_shkey(
94 const struct sctp_association *asoc,
95 __u16 key_id);
96 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
97 struct sctp_association *asoc,
98 gfp_t gfp);
99 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
100 void sctp_auth_destroy_hmacs(struct crypto_hash *auth_hmacs[]);
101 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
102 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
103 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
104 struct sctp_hmac_algo_param *hmacs);
105 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
106 __be16 hmac_id);
107 int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
108 int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
109 void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
110 struct sk_buff *skb,
111 struct sctp_auth_chunk *auth, gfp_t gfp);
112
113 /* API Helpers */
114 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
115 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
116 struct sctp_hmacalgo *hmacs);
117 int sctp_auth_set_key(struct sctp_endpoint *ep,
118 struct sctp_association *asoc,
119 struct sctp_authkey *auth_key);
120 int sctp_auth_set_active_key(struct sctp_endpoint *ep,
121 struct sctp_association *asoc,
122 __u16 key_id);
123 int sctp_auth_del_key_id(struct sctp_endpoint *ep,
124 struct sctp_association *asoc,
125 __u16 key_id);
126
127 #endif
128