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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#include <linux/refcount.h>
35
36struct sctp_endpoint;
37struct sctp_association;
38struct sctp_authkey;
39struct sctp_hmacalgo;
40struct crypto_shash;
41
42/*
43 * Define a generic struct that will hold all the info
44 * necessary for an HMAC transform
45 */
46struct sctp_hmac {
47 __u16 hmac_id; /* one of the above ids */
48 char *hmac_name; /* name for loading */
49 __u16 hmac_len; /* length of the signature */
50};
51
52/* This is generic structure that containst authentication bytes used
53 * as keying material. It's a what is referred to as byte-vector all
54 * over SCTP-AUTH
55 */
56struct sctp_auth_bytes {
57 refcount_t refcnt;
58 __u32 len;
59 __u8 data[];
60};
61
62/* Definition for a shared key, weather endpoint or association */
63struct sctp_shared_key {
64 struct list_head key_list;
65 __u16 key_id;
66 struct sctp_auth_bytes *key;
67};
68
69#define key_for_each(__key, __list_head) \
70 list_for_each_entry(__key, __list_head, key_list)
71
72#define key_for_each_safe(__key, __tmp, __list_head) \
73 list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
74
75static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
76{
77 if (!key)
78 return;
79
80 refcount_inc(&key->refcnt);
81}
82
83void sctp_auth_key_put(struct sctp_auth_bytes *key);
84struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
85void sctp_auth_destroy_keys(struct list_head *keys);
86int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
87struct sctp_shared_key *sctp_auth_get_shkey(
88 const struct sctp_association *asoc,
89 __u16 key_id);
90int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
91 struct sctp_association *asoc,
92 gfp_t gfp);
93int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
94void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]);
95struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
96struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
97void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
98 struct sctp_hmac_algo_param *hmacs);
99int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
100 __be16 hmac_id);
101int sctp_auth_send_cid(enum sctp_cid chunk,
102 const struct sctp_association *asoc);
103int sctp_auth_recv_cid(enum sctp_cid chunk,
104 const struct sctp_association *asoc);
105void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
106 struct sk_buff *skb,
107 struct sctp_auth_chunk *auth, gfp_t gfp);
108
109/* API Helpers */
110int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
111int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
112 struct sctp_hmacalgo *hmacs);
113int sctp_auth_set_key(struct sctp_endpoint *ep,
114 struct sctp_association *asoc,
115 struct sctp_authkey *auth_key);
116int sctp_auth_set_active_key(struct sctp_endpoint *ep,
117 struct sctp_association *asoc,
118 __u16 key_id);
119int sctp_auth_del_key_id(struct sctp_endpoint *ep,
120 struct sctp_association *asoc,
121 __u16 key_id);
122
123#endif