60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_COOKIE_H
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#define _WG_COOKIE_H
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#include "messages.h"
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#include <linux/rwsem.h>
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struct wg_peer;
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struct cookie_checker {
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u8 secret[NOISE_HASH_LEN];
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u8 cookie_encryption_key[NOISE_SYMMETRIC_KEY_LEN];
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u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
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u64 secret_birthdate;
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struct rw_semaphore secret_lock;
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struct wg_device *device;
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};
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struct cookie {
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u64 birthdate;
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bool is_valid;
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u8 cookie[COOKIE_LEN];
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bool have_sent_mac1;
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u8 last_mac1_sent[COOKIE_LEN];
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u8 cookie_decryption_key[NOISE_SYMMETRIC_KEY_LEN];
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u8 message_mac1_key[NOISE_SYMMETRIC_KEY_LEN];
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struct rw_semaphore lock;
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};
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enum cookie_mac_state {
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INVALID_MAC,
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VALID_MAC_BUT_NO_COOKIE,
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VALID_MAC_WITH_COOKIE_BUT_RATELIMITED,
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VALID_MAC_WITH_COOKIE
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};
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void wg_cookie_checker_init(struct cookie_checker *checker,
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struct wg_device *wg);
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void wg_cookie_checker_precompute_device_keys(struct cookie_checker *checker);
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void wg_cookie_checker_precompute_peer_keys(struct wg_peer *peer);
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void wg_cookie_init(struct cookie *cookie);
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enum cookie_mac_state wg_cookie_validate_packet(struct cookie_checker *checker,
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struct sk_buff *skb,
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bool check_cookie);
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void wg_cookie_add_mac_to_packet(void *message, size_t len,
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struct wg_peer *peer);
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void wg_cookie_message_create(struct message_handshake_cookie *src,
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struct sk_buff *skb, __le32 index,
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struct cookie_checker *checker);
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void wg_cookie_message_consume(struct message_handshake_cookie *src,
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struct wg_device *wg);
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#endif /* _WG_COOKIE_H */
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