drivers/net/wireguard/cookie.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   4  */
   5
   6 #ifndef _WG_COOKIE_H
   7 #define _WG_COOKIE_H
   8
   9 #include "messages.h"
  10 #include <linux/rwsem.h>
  11
  12 struct wg_peer;
  13
  14 struct cookie_checker {
  15         u8 secret[NOISE_HASH_LEN];
  16         u8 cookie_encryption_key[NOISE_SYMMETRIC_KEY_LEN];
  17         u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
  18         u64 secret_birthdate;
  19         struct rw_semaphore secret_lock;
  20         struct wg_device *device;
  21 };
  22
  23 struct cookie {
  24         u64 birthdate;
  25         bool is_valid;
  26         u8 cookie[COOKIE_LEN];
  27         bool have_sent_mac1;
  28         u8 last_mac1_sent[COOKIE_LEN];
  29         u8 cookie_decryption_key[NOISE_SYMMETRIC_KEY_LEN];
  30         u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
  31         struct rw_semaphore lock;
  32 };
  33
  34 enum cookie_mac_state {
  35         INVALID_MAC,
  36         VALID_MAC_BUT_NO_COOKIE,
  37         VALID_MAC_WITH_COOKIE_BUT_RATELIMITED,
  38         VALID_MAC_WITH_COOKIE
  39 };
  40
  41 void wg_cookie_checker_init(struct cookie_checker *checker,
  42                             struct wg_device *wg);
  43 void wg_cookie_checker_precompute_device_keys(struct cookie_checker *checker);
  44 void wg_cookie_checker_precompute_peer_keys(struct wg_peer *peer);
  45 void wg_cookie_init(struct cookie *cookie);
  46
  47 enum cookie_mac_state wg_cookie_validate_packet(struct cookie_checker *checker,
  48                                                 struct sk_buff *skb,
  49                                                 bool check_cookie);
  50 void wg_cookie_add_mac_to_packet(void *message, size_t len,
  51                                  struct wg_peer *peer);
  52
  53 void wg_cookie_message_create(struct message_handshake_cookie *src,
  54                               struct sk_buff *skb, __le32 index,
  55                               struct cookie_checker *checker);
  56 void wg_cookie_message_consume(struct message_handshake_cookie *src,
  57                                struct wg_device *wg);
  58
  59 #endif /* _WG_COOKIE_H */