cookie.h 1.6 KB

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