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1 | /* SCTP kernel reference Implementation | |
2 | * (C) Copyright 2007 Hewlett-Packard Development Company, L.P. | |
3 | * | |
4 | * This file is part of the SCTP kernel reference Implementation | |
5 | * | |
6 | * The SCTP reference 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 | * The SCTP reference 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 | ||
47 | /* | |
48 | * Define a generic struct that will hold all the info | |
49 | * necessary for an HMAC transform | |
50 | */ | |
51 | struct sctp_hmac { | |
52 | __u16 hmac_id; /* one of the above ids */ | |
53 | char *hmac_name; /* name for loading */ | |
54 | __u16 hmac_len; /* length of the signature */ | |
55 | }; | |
56 | ||
57 | /* This is generic structure that containst authentication bytes used | |
58 | * as keying material. It's a what is referred to as byte-vector all | |
59 | * over SCTP-AUTH | |
60 | */ | |
61 | struct sctp_auth_bytes { | |
62 | atomic_t refcnt; | |
63 | __u32 len; | |
64 | __u8 data[]; | |
65 | }; | |
66 | ||
67 | /* Definition for a shared key, weather endpoint or association */ | |
68 | struct sctp_shared_key { | |
69 | struct list_head key_list; | |
70 | __u16 key_id; | |
71 | struct sctp_auth_bytes *key; | |
72 | }; | |
73 | ||
74 | #define key_for_each(__key, __list_head) \ | |
75 | list_for_each_entry(__key, __list_head, key_list) | |
76 | ||
77 | #define key_for_each_safe(__key, __tmp, __list_head) \ | |
78 | list_for_each_entry_safe(__key, __tmp, __list_head, key_list) | |
79 | ||
80 | static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key) | |
81 | { | |
82 | if (!key) | |
83 | return; | |
84 | ||
85 | atomic_inc(&key->refcnt); | |
86 | } | |
87 | ||
88 | void sctp_auth_key_put(struct sctp_auth_bytes *key); | |
89 | struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp); | |
90 | void sctp_auth_shkey_free(struct sctp_shared_key *sh_key); | |
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 | __u16 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 | #endif |