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/* 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);
void 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]);
void 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 */
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