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/*
* Copyright (c) 2020 Doc.ai and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __included_wg_messages_h__
#define __included_wg_messages_h__
#include <stdint.h>
#include <wireguard/wireguard_noise.h>
#include <wireguard/wireguard_cookie.h>
#define WG_TICK 0.01 /**< WG tick period (s) */
#define WHZ (u32) (1/WG_TICK) /**< WG tick frequency */
#define NOISE_KEY_LEN_BASE64 ((((NOISE_PUBLIC_KEY_LEN) + 2) / 3) * 4 + 1)
#define noise_encrypted_len(plain_len) ((plain_len) + NOISE_AUTHTAG_LEN)
enum limits
{
REKEY_TIMEOUT = 5,
REKEY_TIMEOUT_JITTER = WHZ / 3,
KEEPALIVE_TIMEOUT = 10,
MAX_TIMER_HANDSHAKES = 90 / REKEY_TIMEOUT,
MAX_PEERS = 1U << 20
};
#define foreach_wg_message_type \
_(INVALID, "Invalid") \
_(HANDSHAKE_INITIATION, "Handshake initiation") \
_(HANDSHAKE_RESPONSE, "Handshake response") \
_(HANDSHAKE_COOKIE, "Handshake cookie") \
_(DATA, "Data") \
typedef enum message_type
{
#define _(v,s) MESSAGE_##v,
foreach_wg_message_type
#undef _
} message_type_t;
typedef struct message_header
{
message_type_t type;
} message_header_t;
typedef struct message_handshake_initiation
{
message_header_t header;
u32 sender_index;
u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
u8 encrypted_static[noise_encrypted_len (NOISE_PUBLIC_KEY_LEN)];
u8 encrypted_timestamp[noise_encrypted_len (NOISE_TIMESTAMP_LEN)];
message_macs_t macs;
} message_handshake_initiation_t;
typedef struct message_handshake_response
{
message_header_t header;
u32 sender_index;
u32 receiver_index;
u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
u8 encrypted_nothing[noise_encrypted_len (0)];
message_macs_t macs;
} message_handshake_response_t;
typedef struct message_handshake_cookie
{
message_header_t header;
u32 receiver_index;
u8 nonce[COOKIE_NONCE_SIZE];
u8 encrypted_cookie[noise_encrypted_len (COOKIE_MAC_SIZE)];
} message_handshake_cookie_t;
typedef struct message_data
{
message_header_t header;
u32 receiver_index;
u64 counter;
u8 encrypted_data[];
} message_data_t;
#define message_data_len(plain_len) \
(noise_encrypted_len(plain_len) + sizeof(message_data_t))
#endif /* __included_wg_messages_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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