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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Vlad Yasevich1f485642007-10-09 01:15:59 -07002 * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
3 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05004 * This file is part of the SCTP kernel implementation
Vlad Yasevich1f485642007-10-09 01:15:59 -07005 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05006 * This SCTP implementation is free software;
Vlad Yasevich1f485642007-10-09 01:15:59 -07007 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050012 * This SCTP implementation is distributed in the hope that it
Vlad Yasevich1f485642007-10-09 01:15:59 -070013 * 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
Jeff Kirshera6227e22013-12-06 09:13:40 -080019 * along with GNU CC; see the file COPYING. If not, see
20 * <http://www.gnu.org/licenses/>.
Vlad Yasevich1f485642007-10-09 01:15:59 -070021 *
22 * Please send any bug reports or fixes you make to the
23 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020024 * lksctp developers <linux-sctp@vger.kernel.org>
Vlad Yasevich1f485642007-10-09 01:15:59 -070025 *
Vlad Yasevich1f485642007-10-09 01:15:59 -070026 * Written or modified by:
27 * Vlad Yasevich <vladislav.yasevich@hp.com>
Vlad Yasevich1f485642007-10-09 01:15:59 -070028 */
29
30#ifndef __sctp_auth_h__
31#define __sctp_auth_h__
32
33#include <linux/list.h>
34#include <linux/crypto.h>
35
36struct sctp_endpoint;
37struct sctp_association;
38struct sctp_authkey;
Vlad Yasevich65b07e52007-09-16 19:34:00 -070039struct sctp_hmacalgo;
Vlad Yasevich1f485642007-10-09 01:15:59 -070040
41/*
42 * Define a generic struct that will hold all the info
43 * necessary for an HMAC transform
44 */
45struct 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 */
55struct 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 */
62struct 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
74static 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
82void sctp_auth_key_put(struct sctp_auth_bytes *key);
83struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
Vlad Yasevich1f485642007-10-09 01:15:59 -070084void sctp_auth_destroy_keys(struct list_head *keys);
85int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
86struct sctp_shared_key *sctp_auth_get_shkey(
87 const struct sctp_association *asoc,
88 __u16 key_id);
89int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
90 struct sctp_association *asoc,
91 gfp_t gfp);
92int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
93void sctp_auth_destroy_hmacs(struct crypto_hash *auth_hmacs[]);
94struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
95struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
96void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
97 struct sctp_hmac_algo_param *hmacs);
98int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
Al Virod06f6082007-10-29 05:03:23 +000099 __be16 hmac_id);
Vlad Yasevich1f485642007-10-09 01:15:59 -0700100int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
101int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
102void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
103 struct sk_buff *skb,
104 struct sctp_auth_chunk *auth, gfp_t gfp);
Vlad Yasevich65b07e52007-09-16 19:34:00 -0700105
106/* API Helpers */
107int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
108int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
109 struct sctp_hmacalgo *hmacs);
110int sctp_auth_set_key(struct sctp_endpoint *ep,
111 struct sctp_association *asoc,
112 struct sctp_authkey *auth_key);
113int sctp_auth_set_active_key(struct sctp_endpoint *ep,
114 struct sctp_association *asoc,
115 __u16 key_id);
116int sctp_auth_del_key_id(struct sctp_endpoint *ep,
117 struct sctp_association *asoc,
118 __u16 key_id);
119
Vlad Yasevich1f485642007-10-09 01:15:59 -0700120#endif