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 35 struct sctp_endpoint; 36 struct sctp_association; 37 struct sctp_authkey; 38 struct sctp_hmacalgo; 39 struct crypto_shash; 40 41 /* 42 * Define a generic struct that will hold all the info 43 * necessary for an HMAC transform 44 */ 45 struct 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 */ 55 struct 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 */ 62 struct 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 74 static 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 82 void sctp_auth_key_put(struct sctp_auth_bytes *key); 83 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp); 84 void sctp_auth_destroy_keys(struct list_head *keys); 85 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp); 86 struct sctp_shared_key *sctp_auth_get_shkey( 87 const struct sctp_association *asoc, 88 __u16 key_id); 89 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep, 90 struct sctp_association *asoc, 91 gfp_t gfp); 92 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp); 93 void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]); 94 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id); 95 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc); 96 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc, 97 struct sctp_hmac_algo_param *hmacs); 98 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc, 99 __be16 hmac_id); 100 int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc); 101 int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc); 102 void sctp_auth_calculate_hmac(const struct sctp_association *asoc, 103 struct sk_buff *skb, 104 struct sctp_auth_chunk *auth, gfp_t gfp); 105 106 /* API Helpers */ 107 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id); 108 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep, 109 struct sctp_hmacalgo *hmacs); 110 int sctp_auth_set_key(struct sctp_endpoint *ep, 111 struct sctp_association *asoc, 112 struct sctp_authkey *auth_key); 113 int sctp_auth_set_active_key(struct sctp_endpoint *ep, 114 struct sctp_association *asoc, 115 __u16 key_id); 116 int sctp_auth_del_key_id(struct sctp_endpoint *ep, 117 struct sctp_association *asoc, 118 __u16 key_id); 119 120 #endif 121