129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
*/
|
|
|
|
#ifndef _WG_MESSAGES_H
|
|
#define _WG_MESSAGES_H
|
|
|
|
#include <crypto/curve25519.h>
|
|
#include <crypto/chacha20poly1305.h>
|
|
#include <crypto/blake2s.h>
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
enum noise_lengths {
|
|
NOISE_PUBLIC_KEY_LEN = CURVE25519_KEY_SIZE,
|
|
NOISE_SYMMETRIC_KEY_LEN = CHACHA20POLY1305_KEY_SIZE,
|
|
NOISE_TIMESTAMP_LEN = sizeof(u64) + sizeof(u32),
|
|
NOISE_AUTHTAG_LEN = CHACHA20POLY1305_AUTHTAG_SIZE,
|
|
NOISE_HASH_LEN = BLAKE2S_HASH_SIZE
|
|
};
|
|
|
|
#define noise_encrypted_len(plain_len) ((plain_len) + NOISE_AUTHTAG_LEN)
|
|
|
|
enum cookie_values {
|
|
COOKIE_SECRET_MAX_AGE = 2 * 60,
|
|
COOKIE_SECRET_LATENCY = 5,
|
|
COOKIE_NONCE_LEN = XCHACHA20POLY1305_NONCE_SIZE,
|
|
COOKIE_LEN = 16
|
|
};
|
|
|
|
enum counter_values {
|
|
COUNTER_BITS_TOTAL = 2048,
|
|
COUNTER_REDUNDANT_BITS = BITS_PER_LONG,
|
|
COUNTER_WINDOW_SIZE = COUNTER_BITS_TOTAL - COUNTER_REDUNDANT_BITS
|
|
};
|
|
|
|
enum limits {
|
|
REKEY_AFTER_MESSAGES = 1ULL << 60,
|
|
REJECT_AFTER_MESSAGES = U64_MAX - COUNTER_WINDOW_SIZE - 1,
|
|
REKEY_TIMEOUT = 5,
|
|
REKEY_TIMEOUT_JITTER_MAX_JIFFIES = HZ / 3,
|
|
REKEY_AFTER_TIME = 120,
|
|
REJECT_AFTER_TIME = 180,
|
|
INITIATIONS_PER_SECOND = 50,
|
|
MAX_PEERS_PER_DEVICE = 1U << 20,
|
|
KEEPALIVE_TIMEOUT = 10,
|
|
MAX_TIMER_HANDSHAKES = 90 / REKEY_TIMEOUT,
|
|
MAX_QUEUED_INCOMING_HANDSHAKES = 4096, /* TODO: replace this with DQL */
|
|
MAX_STAGED_PACKETS = 128,
|
|
MAX_QUEUED_PACKETS = 1024 /* TODO: replace this with DQL */
|
|
};
|
|
|
|
enum message_type {
|
|
MESSAGE_INVALID = 0,
|
|
MESSAGE_HANDSHAKE_INITIATION = 1,
|
|
MESSAGE_HANDSHAKE_RESPONSE = 2,
|
|
MESSAGE_HANDSHAKE_COOKIE = 3,
|
|
MESSAGE_DATA = 4
|
|
};
|
|
|
|
struct message_header {
|
|
/* The actual layout of this that we want is:
|
|
* u8 type
|
|
* u8 reserved_zero[3]
|
|
*
|
|
* But it turns out that by encoding this as little endian,
|
|
* we achieve the same thing, and it makes checking faster.
|
|
*/
|
|
__le32 type;
|
|
};
|
|
|
|
struct message_macs {
|
|
u8 mac1[COOKIE_LEN];
|
|
u8 mac2[COOKIE_LEN];
|
|
};
|
|
|
|
struct message_handshake_initiation {
|
|
struct message_header header;
|
|
__le32 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)];
|
|
struct message_macs macs;
|
|
};
|
|
|
|
struct message_handshake_response {
|
|
struct message_header header;
|
|
__le32 sender_index;
|
|
__le32 receiver_index;
|
|
u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
|
|
u8 encrypted_nothing[noise_encrypted_len(0)];
|
|
struct message_macs macs;
|
|
};
|
|
|
|
struct message_handshake_cookie {
|
|
struct message_header header;
|
|
__le32 receiver_index;
|
|
u8 nonce[COOKIE_NONCE_LEN];
|
|
u8 encrypted_cookie[noise_encrypted_len(COOKIE_LEN)];
|
|
};
|
|
|
|
struct message_data {
|
|
struct message_header header;
|
|
__le32 key_idx;
|
|
__le64 counter;
|
|
u8 encrypted_data[];
|
|
};
|
|
|
|
#define message_data_len(plain_len) \
|
|
(noise_encrypted_len(plain_len) + sizeof(struct message_data))
|
|
|
|
enum message_alignments {
|
|
MESSAGE_PADDING_MULTIPLE = 16,
|
|
MESSAGE_MINIMUM_LENGTH = message_data_len(0)
|
|
};
|
|
|
|
#define SKB_HEADER_LEN \
|
|
(max(sizeof(struct iphdr), sizeof(struct ipv6hdr)) + \
|
|
sizeof(struct udphdr) + NET_SKB_PAD)
|
|
#define DATA_PACKET_HEAD_ROOM \
|
|
ALIGN(sizeof(struct message_data) + SKB_HEADER_LEN, 4)
|
|
|
|
enum { HANDSHAKE_DSCP = 0x88 /* AF41, plus 00 ECN */ };
|
|
|
|
#endif /* _WG_MESSAGES_H */
|