| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. |
| */ |
| #ifndef _WG_NOISE_H |
| #define _WG_NOISE_H |
| |
| #include "messages.h" |
| #include "peerlookup.h" |
| |
| #include <linux/types.h> |
| #include <linux/spinlock.h> |
| #include <linux/atomic.h> |
| #include <linux/rwsem.h> |
| #include <linux/mutex.h> |
| #include <linux/kref.h> |
| |
| union noise_counter { |
| struct { |
| u64 counter; |
| unsigned long backtrack[COUNTER_BITS_TOTAL / BITS_PER_LONG]; |
| spinlock_t lock; |
| } receive; |
| atomic64_t counter; |
| }; |
| |
| struct noise_symmetric_key { |
| u8 key[NOISE_SYMMETRIC_KEY_LEN]; |
| union noise_counter counter; |
| u64 birthdate; |
| bool is_valid; |
| }; |
| |
| struct noise_keypair { |
| struct index_hashtable_entry entry; |
| struct noise_symmetric_key sending; |
| struct noise_symmetric_key receiving; |
| __le32 remote_index; |
| bool i_am_the_initiator; |
| struct kref refcount; |
| struct rcu_head rcu; |
| u64 internal_id; |
| }; |
| |
| struct noise_keypairs { |
| struct noise_keypair __rcu *current_keypair; |
| struct noise_keypair __rcu *previous_keypair; |
| struct noise_keypair __rcu *next_keypair; |
| spinlock_t keypair_update_lock; |
| }; |
| |
| struct noise_static_identity { |
| u8 static_public[NOISE_PUBLIC_KEY_LEN]; |
| u8 static_private[NOISE_PUBLIC_KEY_LEN]; |
| struct rw_semaphore lock; |
| bool has_identity; |
| }; |
| |
| enum noise_handshake_state { |
| HANDSHAKE_ZEROED, |
| HANDSHAKE_CREATED_INITIATION, |
| HANDSHAKE_CONSUMED_INITIATION, |
| HANDSHAKE_CREATED_RESPONSE, |
| HANDSHAKE_CONSUMED_RESPONSE |
| }; |
| |
| struct noise_handshake { |
| struct index_hashtable_entry entry; |
| |
| enum noise_handshake_state state; |
| u64 last_initiation_consumption; |
| |
| struct noise_static_identity *static_identity; |
| |
| u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN]; |
| u8 remote_static[NOISE_PUBLIC_KEY_LEN]; |
| u8 remote_ephemeral[NOISE_PUBLIC_KEY_LEN]; |
| u8 precomputed_static_static[NOISE_PUBLIC_KEY_LEN]; |
| |
| u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN]; |
| |
| u8 hash[NOISE_HASH_LEN]; |
| u8 chaining_key[NOISE_HASH_LEN]; |
| |
| u8 latest_timestamp[NOISE_TIMESTAMP_LEN]; |
| __le32 remote_index; |
| |
| /* Protects all members except the immutable (after noise_handshake_ |
| * init): remote_static, precomputed_static_static, static_identity. |
| */ |
| struct rw_semaphore lock; |
| }; |
| |
| struct wg_device; |
| |
| void wg_noise_init(void); |
| bool wg_noise_handshake_init(struct noise_handshake *handshake, |
| struct noise_static_identity *static_identity, |
| const u8 peer_public_key[NOISE_PUBLIC_KEY_LEN], |
| const u8 peer_preshared_key[NOISE_SYMMETRIC_KEY_LEN], |
| struct wg_peer *peer); |
| void wg_noise_handshake_clear(struct noise_handshake *handshake); |
| static inline void wg_noise_reset_last_sent_handshake(atomic64_t *handshake_ns) |
| { |
| atomic64_set(handshake_ns, ktime_get_coarse_boottime_ns() - |
| (u64)(REKEY_TIMEOUT + 1) * NSEC_PER_SEC); |
| } |
| |
| void wg_noise_keypair_put(struct noise_keypair *keypair, bool unreference_now); |
| struct noise_keypair *wg_noise_keypair_get(struct noise_keypair *keypair); |
| void wg_noise_keypairs_clear(struct noise_keypairs *keypairs); |
| bool wg_noise_received_with_keypair(struct noise_keypairs *keypairs, |
| struct noise_keypair *received_keypair); |
| void wg_noise_expire_current_peer_keypairs(struct wg_peer *peer); |
| |
| void wg_noise_set_static_identity_private_key( |
| struct noise_static_identity *static_identity, |
| const u8 private_key[NOISE_PUBLIC_KEY_LEN]); |
| bool wg_noise_precompute_static_static(struct wg_peer *peer); |
| |
| bool |
| wg_noise_handshake_create_initiation(struct message_handshake_initiation *dst, |
| struct noise_handshake *handshake); |
| struct wg_peer * |
| wg_noise_handshake_consume_initiation(struct message_handshake_initiation *src, |
| struct wg_device *wg); |
| |
| bool wg_noise_handshake_create_response(struct message_handshake_response *dst, |
| struct noise_handshake *handshake); |
| struct wg_peer * |
| wg_noise_handshake_consume_response(struct message_handshake_response *src, |
| struct wg_device *wg); |
| |
| bool wg_noise_handshake_begin_session(struct noise_handshake *handshake, |
| struct noise_keypairs *keypairs); |
| |
| #endif /* _WG_NOISE_H */ |