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-rw-r--r--drivers/net/wireguard/noise.h131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/net/wireguard/noise.h b/drivers/net/wireguard/noise.h
new file mode 100644
index 000000000000..9c2cc62dc11e
--- /dev/null
+++ b/drivers/net/wireguard/noise.h
@@ -0,0 +1,131 @@
+/* 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/ktime.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);
+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_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 */