include/net/sctp/auth.h

   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