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, 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 struct sctp_hmacalgo; 47 48 /* 49 * Define a generic struct that will hold all the info 50 * necessary for an HMAC transform 51 */ 52 struct sctp_hmac { 53 __u16 hmac_id; /* one of the above ids */ 54 char *hmac_name; /* name for loading */ 55 __u16 hmac_len; /* length of the signature */ 56 }; 57 58 /* This is generic structure that containst authentication bytes used 59 * as keying material. It's a what is referred to as byte-vector all 60 * over SCTP-AUTH 61 */ 62 struct sctp_auth_bytes { 63 atomic_t refcnt; 64 __u32 len; 65 __u8 data[]; 66 }; 67 68 /* Definition for a shared key, weather endpoint or association */ 69 struct sctp_shared_key { 70 struct list_head key_list; 71 __u16 key_id; 72 struct sctp_auth_bytes *key; 73 }; 74 75 #define key_for_each(__key, __list_head) \ 76 list_for_each_entry(__key, __list_head, key_list) 77 78 #define key_for_each_safe(__key, __tmp, __list_head) \ 79 list_for_each_entry_safe(__key, __tmp, __list_head, key_list) 80 81 static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key) 82 { 83 if (!key) 84 return; 85 86 atomic_inc(&key->refcnt); 87 } 88 89 void sctp_auth_key_put(struct sctp_auth_bytes *key); 90 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp); 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 __be16 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); 112 113 /* API Helpers */ 114 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id); 115 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep, 116 struct sctp_hmacalgo *hmacs); 117 int sctp_auth_set_key(struct sctp_endpoint *ep, 118 struct sctp_association *asoc, 119 struct sctp_authkey *auth_key); 120 int sctp_auth_set_active_key(struct sctp_endpoint *ep, 121 struct sctp_association *asoc, 122 __u16 key_id); 123 int sctp_auth_del_key_id(struct sctp_endpoint *ep, 124 struct sctp_association *asoc, 125 __u16 key_id); 126 127 #endif 128