include/net/sctp/auth.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* SCTP kernel implementation
   3  * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
   4  *
   5  * This file is part of the SCTP kernel implementation
   6  *
   7  * Please send any bug reports or fixes you make to the
   8  * email address(es):
   9  *    lksctp developers <linux-sctp@vger.kernel.org>
  10  *
  11  * Written or modified by:
  12  *   Vlad Yasevich     <vladislav.yasevich@hp.com>
  13  */
  14
  15 #ifndef __sctp_auth_h__
  16 #define __sctp_auth_h__
  17
  18 #include <linux/list.h>
  19 #include <linux/refcount.h>
  20
  21 struct sctp_endpoint;
  22 struct sctp_association;
  23 struct sctp_authkey;
  24 struct sctp_hmacalgo;
  25 struct crypto_shash;
  26
  27 /*
  28  * Define a generic struct that will hold all the info
  29  * necessary for an HMAC transform
  30  */
  31 struct sctp_hmac {
  32         __u16 hmac_id;          /* one of the above ids */
  33         char *hmac_name;        /* name for loading */
  34         __u16 hmac_len;         /* length of the signature */
  35 };
  36
  37 /* This is generic structure that containst authentication bytes used
  38  * as keying material.  It's a what is referred to as byte-vector all
  39  * over SCTP-AUTH
  40  */
  41 struct sctp_auth_bytes {
  42         refcount_t refcnt;
  43         __u32 len;
  44         __u8  data[];
  45 };
  46
  47 /* Definition for a shared key, weather endpoint or association */
  48 struct sctp_shared_key {
  49         struct list_head key_list;
  50         struct sctp_auth_bytes *key;
  51         refcount_t refcnt;
  52         __u16 key_id;
  53         __u8 deactivated;
  54 };
  55
  56 #define key_for_each(__key, __list_head) \
  57         list_for_each_entry(__key, __list_head, key_list)
  58
  59 #define key_for_each_safe(__key, __tmp, __list_head) \
  60         list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
  61
  62 static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
  63 {
  64         if (!key)
  65                 return;
  66
  67         refcount_inc(&key->refcnt);
  68 }
  69
  70 void sctp_auth_key_put(struct sctp_auth_bytes *key);
  71 struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
  72 void sctp_auth_destroy_keys(struct list_head *keys);
  73 int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
  74 struct sctp_shared_key *sctp_auth_get_shkey(
  75                                 const struct sctp_association *asoc,
  76                                 __u16 key_id);
  77 int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
  78                                 struct sctp_association *asoc,
  79                                 gfp_t gfp);
  80 int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
  81 void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]);
  82 struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
  83 struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
  84 void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
  85                                      struct sctp_hmac_algo_param *hmacs);
  86 int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
  87                                     __be16 hmac_id);
  88 int sctp_auth_send_cid(enum sctp_cid chunk,
  89                        const struct sctp_association *asoc);
  90 int sctp_auth_recv_cid(enum sctp_cid chunk,
  91                        const struct sctp_association *asoc);
  92 void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
  93                               struct sk_buff *skb, struct sctp_auth_chunk *auth,
  94                               struct sctp_shared_key *ep_key, gfp_t gfp);
  95 void sctp_auth_shkey_release(struct sctp_shared_key *sh_key);
  96 void sctp_auth_shkey_hold(struct sctp_shared_key *sh_key);
  97
  98 /* API Helpers */
  99 int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
 100 int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
 101                             struct sctp_hmacalgo *hmacs);
 102 int sctp_auth_set_key(struct sctp_endpoint *ep, struct sctp_association *asoc,
 103                       struct sctp_authkey *auth_key);
 104 int sctp_auth_set_active_key(struct sctp_endpoint *ep,
 105                              struct sctp_association *asoc, __u16 key_id);
 106 int sctp_auth_del_key_id(struct sctp_endpoint *ep,
 107                          struct sctp_association *asoc, __u16 key_id);
 108 int sctp_auth_deact_key_id(struct sctp_endpoint *ep,
 109                            struct sctp_association *asoc, __u16 key_id);
 110
 111 #endif