129 lines
		
	
	
		
			3.3 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			129 lines
		
	
	
		
			3.3 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| /* SPDX-License-Identifier: GPL-2.0 */
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| /*
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|  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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|  */
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| 
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| #ifndef _WG_MESSAGES_H
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| #define _WG_MESSAGES_H
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| 
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| #include <crypto/curve25519.h>
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| #include <crypto/chacha20poly1305.h>
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| #include <crypto/blake2s.h>
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| 
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| #include <linux/kernel.h>
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| #include <linux/param.h>
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| #include <linux/skbuff.h>
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| 
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| enum noise_lengths {
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| 	NOISE_PUBLIC_KEY_LEN = CURVE25519_KEY_SIZE,
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| 	NOISE_SYMMETRIC_KEY_LEN = CHACHA20POLY1305_KEY_SIZE,
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| 	NOISE_TIMESTAMP_LEN = sizeof(u64) + sizeof(u32),
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| 	NOISE_AUTHTAG_LEN = CHACHA20POLY1305_AUTHTAG_SIZE,
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| 	NOISE_HASH_LEN = BLAKE2S_HASH_SIZE
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| };
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| 
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| #define noise_encrypted_len(plain_len) ((plain_len) + NOISE_AUTHTAG_LEN)
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| 
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| enum cookie_values {
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| 	COOKIE_SECRET_MAX_AGE = 2 * 60,
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| 	COOKIE_SECRET_LATENCY = 5,
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| 	COOKIE_NONCE_LEN = XCHACHA20POLY1305_NONCE_SIZE,
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| 	COOKIE_LEN = 16
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| };
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| 
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| enum counter_values {
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| 	COUNTER_BITS_TOTAL = 8192,
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| 	COUNTER_REDUNDANT_BITS = BITS_PER_LONG,
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| 	COUNTER_WINDOW_SIZE = COUNTER_BITS_TOTAL - COUNTER_REDUNDANT_BITS
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| };
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| 
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| enum limits {
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| 	REKEY_AFTER_MESSAGES = 1ULL << 60,
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| 	REJECT_AFTER_MESSAGES = U64_MAX - COUNTER_WINDOW_SIZE - 1,
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| 	REKEY_TIMEOUT = 5,
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| 	REKEY_TIMEOUT_JITTER_MAX_JIFFIES = HZ / 3,
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| 	REKEY_AFTER_TIME = 120,
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| 	REJECT_AFTER_TIME = 180,
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| 	INITIATIONS_PER_SECOND = 50,
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| 	MAX_PEERS_PER_DEVICE = 1U << 20,
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| 	KEEPALIVE_TIMEOUT = 10,
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| 	MAX_TIMER_HANDSHAKES = 90 / REKEY_TIMEOUT,
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| 	MAX_QUEUED_INCOMING_HANDSHAKES = 4096, /* TODO: replace this with DQL */
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| 	MAX_STAGED_PACKETS = 128,
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| 	MAX_QUEUED_PACKETS = 1024 /* TODO: replace this with DQL */
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| };
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| 
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| enum message_type {
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| 	MESSAGE_INVALID = 0,
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| 	MESSAGE_HANDSHAKE_INITIATION = 1,
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| 	MESSAGE_HANDSHAKE_RESPONSE = 2,
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| 	MESSAGE_HANDSHAKE_COOKIE = 3,
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| 	MESSAGE_DATA = 4
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| };
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| 
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| struct message_header {
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| 	/* The actual layout of this that we want is:
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| 	 * u8 type
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| 	 * u8 reserved_zero[3]
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| 	 *
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| 	 * But it turns out that by encoding this as little endian,
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| 	 * we achieve the same thing, and it makes checking faster.
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| 	 */
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| 	__le32 type;
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| };
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| 
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| struct message_macs {
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| 	u8 mac1[COOKIE_LEN];
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| 	u8 mac2[COOKIE_LEN];
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| };
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| 
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| struct message_handshake_initiation {
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| 	struct message_header header;
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| 	__le32 sender_index;
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| 	u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
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| 	u8 encrypted_static[noise_encrypted_len(NOISE_PUBLIC_KEY_LEN)];
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| 	u8 encrypted_timestamp[noise_encrypted_len(NOISE_TIMESTAMP_LEN)];
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| 	struct message_macs macs;
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| };
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| 
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| struct message_handshake_response {
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| 	struct message_header header;
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| 	__le32 sender_index;
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| 	__le32 receiver_index;
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| 	u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
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| 	u8 encrypted_nothing[noise_encrypted_len(0)];
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| 	struct message_macs macs;
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| };
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| 
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| struct message_handshake_cookie {
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| 	struct message_header header;
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| 	__le32 receiver_index;
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| 	u8 nonce[COOKIE_NONCE_LEN];
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| 	u8 encrypted_cookie[noise_encrypted_len(COOKIE_LEN)];
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| };
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| 
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| struct message_data {
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| 	struct message_header header;
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| 	__le32 key_idx;
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| 	__le64 counter;
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| 	u8 encrypted_data[];
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| };
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| 
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| #define message_data_len(plain_len) \
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| 	(noise_encrypted_len(plain_len) + sizeof(struct message_data))
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| 
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| enum message_alignments {
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| 	MESSAGE_PADDING_MULTIPLE = 16,
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| 	MESSAGE_MINIMUM_LENGTH = message_data_len(0)
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| };
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| 
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| #define SKB_HEADER_LEN                                       \
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| 	(max(sizeof(struct iphdr), sizeof(struct ipv6hdr)) + \
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| 	 sizeof(struct udphdr) + NET_SKB_PAD)
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| #define DATA_PACKET_HEAD_ROOM \
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| 	ALIGN(sizeof(struct message_data) + SKB_HEADER_LEN, 4)
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| 
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| enum { HANDSHAKE_DSCP = 0x88 /* AF41, plus 00 ECN */ };
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| 
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| #endif /* _WG_MESSAGES_H */
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