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 #include <linux/refcount.h> 35 36 struct sctp_endpoint; 37 struct sctp_association; 38 struct sctp_authkey; 39 struct sctp_hmacalgo; 40 struct crypto_shash; 41 42 /* 43 * Define a generic struct that will hold all the info 44 * necessary for an HMAC transform 45 */ 46 struct sctp_hmac { 47 __u16 hmac_id; /* one of the above ids */ 48 char *hmac_name; /* name for loading */ 49 __u16 hmac_len; /* length of the signature */ 50 }; 51 52 /* This is generic structure that containst authentication bytes used 53 * as keying material. It's a what is referred to as byte-vector all 54 * over SCTP-AUTH 55 */ 56 struct sctp_auth_bytes { 57 refcount_t refcnt; 58 __u32 len; 59 __u8 data[]; 60 }; 61 62 /* Definition for a shared key, weather endpoint or association */ 63 struct sctp_shared_key { 64 struct list_head key_list; 65 __u16 key_id; 66 struct sctp_auth_bytes *key; 67 }; 68 69 #define key_for_each(__key, __list_head) \ 70 list_for_each_entry(__key, __list_head, key_list) 71 72 #define key_for_each_safe(__key, __tmp, __list_head) \ 73 list_for_each_entry_safe(__key, __tmp, __list_head, key_list) 74 75 static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key) 76 { 77 if (!key) 78 return; 79 80 refcount_inc(&key->refcnt); 81 } 82 83 void sctp_auth_key_put(struct sctp_auth_bytes *key); 84 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp); 85 void sctp_auth_destroy_keys(struct list_head *keys); 86 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp); 87 struct sctp_shared_key *sctp_auth_get_shkey( 88 const struct sctp_association *asoc, 89 __u16 key_id); 90 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep, 91 struct sctp_association *asoc, 92 gfp_t gfp); 93 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp); 94 void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]); 95 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id); 96 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc); 97 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc, 98 struct sctp_hmac_algo_param *hmacs); 99 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc, 100 __be16 hmac_id); 101 int sctp_auth_send_cid(enum sctp_cid chunk, 102 const struct sctp_association *asoc); 103 int sctp_auth_recv_cid(enum sctp_cid chunk, 104 const struct sctp_association *asoc); 105 void sctp_auth_calculate_hmac(const struct sctp_association *asoc, 106 struct sk_buff *skb, 107 struct sctp_auth_chunk *auth, gfp_t gfp); 108 109 /* API Helpers */ 110 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id); 111 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep, 112 struct sctp_hmacalgo *hmacs); 113 int sctp_auth_set_key(struct sctp_endpoint *ep, 114 struct sctp_association *asoc, 115 struct sctp_authkey *auth_key); 116 int sctp_auth_set_active_key(struct sctp_endpoint *ep, 117 struct sctp_association *asoc, 118 __u16 key_id); 119 int sctp_auth_del_key_id(struct sctp_endpoint *ep, 120 struct sctp_association *asoc, 121 __u16 key_id); 122 123 #endif 124