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135 lines
3.9 KiB
135 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved. |
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*/ |
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#ifndef _WG_NOISE_H |
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#define _WG_NOISE_H |
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#include "messages.h" |
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#include "peerlookup.h" |
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#include <linux/types.h> |
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#include <linux/spinlock.h> |
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#include <linux/atomic.h> |
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#include <linux/rwsem.h> |
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#include <linux/mutex.h> |
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#include <linux/kref.h> |
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struct noise_replay_counter { |
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u64 counter; |
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spinlock_t lock; |
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unsigned long backtrack[COUNTER_BITS_TOTAL / BITS_PER_LONG]; |
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}; |
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struct noise_symmetric_key { |
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u8 key[NOISE_SYMMETRIC_KEY_LEN]; |
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u64 birthdate; |
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bool is_valid; |
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}; |
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struct noise_keypair { |
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struct index_hashtable_entry entry; |
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struct noise_symmetric_key sending; |
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atomic64_t sending_counter; |
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struct noise_symmetric_key receiving; |
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struct noise_replay_counter receiving_counter; |
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__le32 remote_index; |
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bool i_am_the_initiator; |
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struct kref refcount; |
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struct rcu_head rcu; |
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u64 internal_id; |
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}; |
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struct noise_keypairs { |
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struct noise_keypair __rcu *current_keypair; |
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struct noise_keypair __rcu *previous_keypair; |
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struct noise_keypair __rcu *next_keypair; |
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spinlock_t keypair_update_lock; |
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}; |
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struct noise_static_identity { |
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u8 static_public[NOISE_PUBLIC_KEY_LEN]; |
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u8 static_private[NOISE_PUBLIC_KEY_LEN]; |
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struct rw_semaphore lock; |
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bool has_identity; |
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}; |
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enum noise_handshake_state { |
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HANDSHAKE_ZEROED, |
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HANDSHAKE_CREATED_INITIATION, |
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HANDSHAKE_CONSUMED_INITIATION, |
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HANDSHAKE_CREATED_RESPONSE, |
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HANDSHAKE_CONSUMED_RESPONSE |
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}; |
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struct noise_handshake { |
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struct index_hashtable_entry entry; |
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enum noise_handshake_state state; |
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u64 last_initiation_consumption; |
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struct noise_static_identity *static_identity; |
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u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN]; |
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u8 remote_static[NOISE_PUBLIC_KEY_LEN]; |
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u8 remote_ephemeral[NOISE_PUBLIC_KEY_LEN]; |
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u8 precomputed_static_static[NOISE_PUBLIC_KEY_LEN]; |
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u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN]; |
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u8 hash[NOISE_HASH_LEN]; |
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u8 chaining_key[NOISE_HASH_LEN]; |
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u8 latest_timestamp[NOISE_TIMESTAMP_LEN]; |
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__le32 remote_index; |
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/* Protects all members except the immutable (after noise_handshake_ |
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* init): remote_static, precomputed_static_static, static_identity. |
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*/ |
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struct rw_semaphore lock; |
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}; |
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struct wg_device; |
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void wg_noise_init(void); |
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void wg_noise_handshake_init(struct noise_handshake *handshake, |
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struct noise_static_identity *static_identity, |
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const u8 peer_public_key[NOISE_PUBLIC_KEY_LEN], |
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const u8 peer_preshared_key[NOISE_SYMMETRIC_KEY_LEN], |
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struct wg_peer *peer); |
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void wg_noise_handshake_clear(struct noise_handshake *handshake); |
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static inline void wg_noise_reset_last_sent_handshake(atomic64_t *handshake_ns) |
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{ |
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atomic64_set(handshake_ns, ktime_get_coarse_boottime_ns() - |
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(u64)(REKEY_TIMEOUT + 1) * NSEC_PER_SEC); |
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} |
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void wg_noise_keypair_put(struct noise_keypair *keypair, bool unreference_now); |
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struct noise_keypair *wg_noise_keypair_get(struct noise_keypair *keypair); |
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void wg_noise_keypairs_clear(struct noise_keypairs *keypairs); |
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bool wg_noise_received_with_keypair(struct noise_keypairs *keypairs, |
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struct noise_keypair *received_keypair); |
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void wg_noise_expire_current_peer_keypairs(struct wg_peer *peer); |
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void wg_noise_set_static_identity_private_key( |
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struct noise_static_identity *static_identity, |
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const u8 private_key[NOISE_PUBLIC_KEY_LEN]); |
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void wg_noise_precompute_static_static(struct wg_peer *peer); |
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bool |
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wg_noise_handshake_create_initiation(struct message_handshake_initiation *dst, |
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struct noise_handshake *handshake); |
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struct wg_peer * |
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wg_noise_handshake_consume_initiation(struct message_handshake_initiation *src, |
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struct wg_device *wg); |
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bool wg_noise_handshake_create_response(struct message_handshake_response *dst, |
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struct noise_handshake *handshake); |
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struct wg_peer * |
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wg_noise_handshake_consume_response(struct message_handshake_response *src, |
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struct wg_device *wg); |
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bool wg_noise_handshake_begin_session(struct noise_handshake *handshake, |
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struct noise_keypairs *keypairs); |
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#endif /* _WG_NOISE_H */
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