197 lines
7.6 KiB
C
197 lines
7.6 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
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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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* Documentation
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* =============
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*
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* The below enums and macros are for interfacing with WireGuard, using generic
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* netlink, with family WG_GENL_NAME and version WG_GENL_VERSION. It defines two
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* methods: get and set. Note that while they share many common attributes,
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* these two functions actually accept a slightly different set of inputs and
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* outputs.
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*
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* WG_CMD_GET_DEVICE
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* -----------------
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*
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* May only be called via NLM_F_REQUEST | NLM_F_DUMP. The command should contain
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* one but not both of:
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*
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* WGDEVICE_A_IFINDEX: NLA_U32
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* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
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*
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* The kernel will then return several messages (NLM_F_MULTI) containing the
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* following tree of nested items:
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*
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* WGDEVICE_A_IFINDEX: NLA_U32
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* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
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* WGDEVICE_A_PRIVATE_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
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* WGDEVICE_A_PUBLIC_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
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* WGDEVICE_A_LISTEN_PORT: NLA_U16
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* WGDEVICE_A_FWMARK: NLA_U32
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* WGDEVICE_A_PEERS: NLA_NESTED
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* 0: NLA_NESTED
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* WGPEER_A_PUBLIC_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
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* WGPEER_A_PRESHARED_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
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* WGPEER_A_ENDPOINT: NLA_MIN_LEN(struct sockaddr), struct sockaddr_in or struct sockaddr_in6
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* WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16
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* WGPEER_A_LAST_HANDSHAKE_TIME: NLA_EXACT_LEN, struct __kernel_timespec
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* WGPEER_A_RX_BYTES: NLA_U64
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* WGPEER_A_TX_BYTES: NLA_U64
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* WGPEER_A_ALLOWEDIPS: NLA_NESTED
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* 0: NLA_NESTED
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* WGALLOWEDIP_A_FAMILY: NLA_U16
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* WGALLOWEDIP_A_IPADDR: NLA_MIN_LEN(struct in_addr), struct in_addr or struct in6_addr
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* WGALLOWEDIP_A_CIDR_MASK: NLA_U8
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* 0: NLA_NESTED
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* ...
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* 0: NLA_NESTED
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* ...
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* ...
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* WGPEER_A_PROTOCOL_VERSION: NLA_U32
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* 0: NLA_NESTED
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* ...
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* ...
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*
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* It is possible that all of the allowed IPs of a single peer will not
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* fit within a single netlink message. In that case, the same peer will
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* be written in the following message, except it will only contain
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* WGPEER_A_PUBLIC_KEY and WGPEER_A_ALLOWEDIPS. This may occur several
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* times in a row for the same peer. It is then up to the receiver to
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* coalesce adjacent peers. Likewise, it is possible that all peers will
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* not fit within a single message. So, subsequent peers will be sent
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* in following messages, except those will only contain WGDEVICE_A_IFNAME
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* and WGDEVICE_A_PEERS. It is then up to the receiver to coalesce these
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* messages to form the complete list of peers.
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*
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* Since this is an NLA_F_DUMP command, the final message will always be
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* NLMSG_DONE, even if an error occurs. However, this NLMSG_DONE message
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* contains an integer error code. It is either zero or a negative error
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* code corresponding to the errno.
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*
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* WG_CMD_SET_DEVICE
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* -----------------
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*
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* May only be called via NLM_F_REQUEST. The command should contain the
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* following tree of nested items, containing one but not both of
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* WGDEVICE_A_IFINDEX and WGDEVICE_A_IFNAME:
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*
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* WGDEVICE_A_IFINDEX: NLA_U32
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* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
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* WGDEVICE_A_FLAGS: NLA_U32, 0 or WGDEVICE_F_REPLACE_PEERS if all current
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* peers should be removed prior to adding the list below.
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* WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN, all zeros to remove
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* WGDEVICE_A_LISTEN_PORT: NLA_U16, 0 to choose randomly
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* WGDEVICE_A_FWMARK: NLA_U32, 0 to disable
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* WGDEVICE_A_PEERS: NLA_NESTED
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* 0: NLA_NESTED
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* WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
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* WGPEER_A_FLAGS: NLA_U32, 0 and/or WGPEER_F_REMOVE_ME if the
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* specified peer should not exist at the end of the
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* operation, rather than added/updated and/or
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* WGPEER_F_REPLACE_ALLOWEDIPS if all current allowed
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* IPs of this peer should be removed prior to adding
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* the list below and/or WGPEER_F_UPDATE_ONLY if the
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* peer should only be set if it already exists.
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* WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN, all zeros to remove
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* WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
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* WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16, 0 to disable
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* WGPEER_A_ALLOWEDIPS: NLA_NESTED
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* 0: NLA_NESTED
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* WGALLOWEDIP_A_FAMILY: NLA_U16
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* WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
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* WGALLOWEDIP_A_CIDR_MASK: NLA_U8
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* 0: NLA_NESTED
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* ...
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* 0: NLA_NESTED
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* ...
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* ...
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* WGPEER_A_PROTOCOL_VERSION: NLA_U32, should not be set or used at
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* all by most users of this API, as the
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* most recent protocol will be used when
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* this is unset. Otherwise, must be set
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* to 1.
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* 0: NLA_NESTED
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* ...
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* ...
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*
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* It is possible that the amount of configuration data exceeds that of
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* the maximum message length accepted by the kernel. In that case, several
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* messages should be sent one after another, with each successive one
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* filling in information not contained in the prior. Note that if
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* WGDEVICE_F_REPLACE_PEERS is specified in the first message, it probably
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* should not be specified in fragments that come after, so that the list
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* of peers is only cleared the first time but appended after. Likewise for
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* peers, if WGPEER_F_REPLACE_ALLOWEDIPS is specified in the first message
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* of a peer, it likely should not be specified in subsequent fragments.
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*
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* If an error occurs, NLMSG_ERROR will reply containing an errno.
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*/
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#ifndef _WG_UAPI_WIREGUARD_H
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#define _WG_UAPI_WIREGUARD_H
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#define WG_GENL_NAME "wireguard"
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#define WG_GENL_VERSION 1
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#define WG_KEY_LEN 32
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enum wg_cmd {
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WG_CMD_GET_DEVICE,
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WG_CMD_SET_DEVICE,
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__WG_CMD_MAX
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};
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#define WG_CMD_MAX (__WG_CMD_MAX - 1)
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enum wgdevice_flag {
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WGDEVICE_F_REPLACE_PEERS = 1U << 0,
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__WGDEVICE_F_ALL = WGDEVICE_F_REPLACE_PEERS
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};
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enum wgdevice_attribute {
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WGDEVICE_A_UNSPEC,
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WGDEVICE_A_IFINDEX,
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WGDEVICE_A_IFNAME,
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WGDEVICE_A_PRIVATE_KEY,
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WGDEVICE_A_PUBLIC_KEY,
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WGDEVICE_A_FLAGS,
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WGDEVICE_A_LISTEN_PORT,
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WGDEVICE_A_FWMARK,
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WGDEVICE_A_PEERS,
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__WGDEVICE_A_LAST
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};
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#define WGDEVICE_A_MAX (__WGDEVICE_A_LAST - 1)
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enum wgpeer_flag {
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WGPEER_F_REMOVE_ME = 1U << 0,
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WGPEER_F_REPLACE_ALLOWEDIPS = 1U << 1,
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WGPEER_F_UPDATE_ONLY = 1U << 2,
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__WGPEER_F_ALL = WGPEER_F_REMOVE_ME | WGPEER_F_REPLACE_ALLOWEDIPS |
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WGPEER_F_UPDATE_ONLY
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};
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enum wgpeer_attribute {
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WGPEER_A_UNSPEC,
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WGPEER_A_PUBLIC_KEY,
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WGPEER_A_PRESHARED_KEY,
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WGPEER_A_FLAGS,
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WGPEER_A_ENDPOINT,
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WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
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WGPEER_A_LAST_HANDSHAKE_TIME,
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WGPEER_A_RX_BYTES,
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WGPEER_A_TX_BYTES,
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WGPEER_A_ALLOWEDIPS,
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WGPEER_A_PROTOCOL_VERSION,
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__WGPEER_A_LAST
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};
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#define WGPEER_A_MAX (__WGPEER_A_LAST - 1)
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enum wgallowedip_attribute {
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WGALLOWEDIP_A_UNSPEC,
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WGALLOWEDIP_A_FAMILY,
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WGALLOWEDIP_A_IPADDR,
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WGALLOWEDIP_A_CIDR_MASK,
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__WGALLOWEDIP_A_LAST
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};
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#define WGALLOWEDIP_A_MAX (__WGALLOWEDIP_A_LAST - 1)
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#endif /* _WG_UAPI_WIREGUARD_H */
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