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 <linux-sctp@vger.kernel.org>
  26  *
  27  * Written or modified by:
  28  *   Vlad Yasevich     <vladislav.yasevich@hp.com>
  29  */
  30
  31 #ifndef __sctp_auth_h__
  32 #define __sctp_auth_h__
  33
  34 #include <linux/list.h>
  35 #include <linux/crypto.h>
  36
  37 struct sctp_endpoint;
  38 struct sctp_association;
  39 struct sctp_authkey;
  40 struct sctp_hmacalgo;
  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         atomic_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         atomic_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_hash *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(sctp_cid_t chunk, const struct sctp_association *asoc);
 102 int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
 103 void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
 104                             struct sk_buff *skb,
 105                             struct sctp_auth_chunk *auth, gfp_t gfp);
 106
 107 /* API Helpers */
 108 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
 109 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
 110                             struct sctp_hmacalgo *hmacs);
 111 int sctp_auth_set_key(struct sctp_endpoint *ep,
 112                       struct sctp_association *asoc,
 113                       struct sctp_authkey *auth_key);
 114 int sctp_auth_set_active_key(struct sctp_endpoint *ep,
 115                       struct sctp_association *asoc,
 116                       __u16 key_id);
 117 int sctp_auth_del_key_id(struct sctp_endpoint *ep,
 118                       struct sctp_association *asoc,
 119                       __u16 key_id);
 120
 121 #endif