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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* SCTP kernel implementation
3 * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * Please send any bug reports or fixes you make to the
8 * email address(es):
9 * lksctp developers <linux-sctp@vger.kernel.org>
10 *
11 * Written or modified by:
12 * Vlad Yasevich <vladislav.yasevich@hp.com>
13 */
14
15#ifndef __sctp_auth_h__
16#define __sctp_auth_h__
17
18#include <linux/list.h>
19#include <linux/refcount.h>
20
21struct sctp_endpoint;
22struct sctp_association;
23struct sctp_authkey;
24struct sctp_hmacalgo;
25
26/* Defines an HMAC algorithm supported by SCTP chunk authentication */
27struct sctp_hmac {
28 __u16 hmac_id; /* one of SCTP_AUTH_HMAC_ID_* */
29 __u16 hmac_len; /* length of the HMAC value in bytes */
30};
31
32/* This is generic structure that containst authentication bytes used
33 * as keying material. It's a what is referred to as byte-vector all
34 * over SCTP-AUTH
35 */
36struct sctp_auth_bytes {
37 refcount_t refcnt;
38 __u32 len;
39 __u8 data[];
40};
41
42/* Definition for a shared key, weather endpoint or association */
43struct sctp_shared_key {
44 struct list_head key_list;
45 struct sctp_auth_bytes *key;
46 refcount_t refcnt;
47 __u16 key_id;
48 __u8 deactivated;
49};
50
51#define key_for_each(__key, __list_head) \
52 list_for_each_entry(__key, __list_head, key_list)
53
54#define key_for_each_safe(__key, __tmp, __list_head) \
55 list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
56
57static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
58{
59 if (!key)
60 return;
61
62 refcount_inc(&key->refcnt);
63}
64
65void sctp_auth_key_put(struct sctp_auth_bytes *key);
66struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
67void sctp_auth_destroy_keys(struct list_head *keys);
68int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
69struct sctp_shared_key *sctp_auth_get_shkey(
70 const struct sctp_association *asoc,
71 __u16 key_id);
72int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
73 struct sctp_association *asoc,
74 gfp_t gfp);
75const struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
76const struct sctp_hmac *
77sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
78void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
79 struct sctp_hmac_algo_param *hmacs);
80int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
81 __be16 hmac_id);
82int sctp_auth_send_cid(enum sctp_cid chunk,
83 const struct sctp_association *asoc);
84int sctp_auth_recv_cid(enum sctp_cid chunk,
85 const struct sctp_association *asoc);
86void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
87 struct sk_buff *skb, struct sctp_auth_chunk *auth,
88 struct sctp_shared_key *ep_key, gfp_t gfp);
89void sctp_auth_shkey_release(struct sctp_shared_key *sh_key);
90void sctp_auth_shkey_hold(struct sctp_shared_key *sh_key);
91
92/* API Helpers */
93int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
94int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
95 struct sctp_hmacalgo *hmacs);
96int sctp_auth_set_key(struct sctp_endpoint *ep, struct sctp_association *asoc,
97 struct sctp_authkey *auth_key);
98int sctp_auth_set_active_key(struct sctp_endpoint *ep,
99 struct sctp_association *asoc, __u16 key_id);
100int sctp_auth_del_key_id(struct sctp_endpoint *ep,
101 struct sctp_association *asoc, __u16 key_id);
102int sctp_auth_deact_key_id(struct sctp_endpoint *ep,
103 struct sctp_association *asoc, __u16 key_id);
104int sctp_auth_init(struct sctp_endpoint *ep, gfp_t gfp);
105void sctp_auth_free(struct sctp_endpoint *ep);
106
107#endif