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/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* The following MIT license applies only to this file:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this file, to deal in this file without restriction, including without
* limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of this file, and to permit persons to
* whom this file is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of this file.
*
* THIS FILE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THIS FILE OR THE USE OR OTHER DEALINGS IN THIS
* FILE.
*
* Documentation
* =============
*
* The below enums and macros are for interfacing with WireGuard, using generic
* netlink, with family WG_GENL_NAME and version WG_GENL_VERSION. It defines two
* methods: get and set. Note that while they share many common attributes, these
* two functions actually accept a slightly different set of inputs and outputs.
*
* WG_CMD_GET_DEVICE
* -----------------
*
* May only be called via NLM_F_REQUEST | NLM_F_DUMP. The command should contain
* one but not both of:
*
* WGDEVICE_A_IFINDEX: NLA_U32
* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
*
* The kernel will then return several messages (NLM_F_MULTI) containing the following
* tree of nested items:
*
* WGDEVICE_A_IFINDEX: NLA_U32
* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
* WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN
* WGDEVICE_A_PUBLIC_KEY: len WG_KEY_LEN
* WGDEVICE_A_LISTEN_PORT: NLA_U16
* WGDEVICE_A_FWMARK: NLA_U32
* WGDEVICE_A_PEERS: NLA_NESTED
* 0: NLA_NESTED
* WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
* WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN
* WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
* WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16
* WGPEER_A_LAST_HANDSHAKE_TIME: struct timespec
* WGPEER_A_RX_BYTES: NLA_U64
* WGPEER_A_TX_BYTES: NLA_U64
* WGPEER_A_ALLOWEDIPS: NLA_NESTED
* 0: NLA_NESTED
* WGALLOWEDIP_A_FAMILY: NLA_U16
* WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
* WGALLOWEDIP_A_CIDR_MASK: NLA_U8
* 1: NLA_NESTED
* ...
* 2: NLA_NESTED
* ...
* ...
* 1: NLA_NESTED
* ...
* ...
*
* It is possible that all of the allowed IPs of a single peer will not
* fit within a single netlink message. In that case, the same peer will
* be written in the following message, except it will only contain
* WGPEER_A_PUBLIC_KEY and WGPEER_A_ALLOWEDIPS. This may occur several
* times in a row for the same peer. It is then up to the receiver to
* coalesce adjacent peers. Likewise, it is possible that all peers will
* not fit within a single message. So, subsequent peers will be sent
* in following messages, except those will only contain WGDEVICE_A_IFNAME
* and WGDEVICE_A_PEERS. It is then up to the receiver to coalesce these
* messages to form the complete list of peers.
*
* Since this is an NLA_F_DUMP command, the final message will always be
* NLMSG_DONE, even if an error occurs. However, this NLMSG_DONE message
* contains an integer error code. It is either zero or a negative error
* code corresponding to the errno.
*
* WG_CMD_SET_DEVICE
* -----------------
*
* May only be called via NLM_F_REQUEST. The command should contain the following
* tree of nested items, containing one but not both of WGDEVICE_A_IFINDEX
* and WGDEVICE_A_IFNAME:
*
* WGDEVICE_A_IFINDEX: NLA_U32
* WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
* WGDEVICE_A_FLAGS: NLA_U32, 0 or WGDEVICE_F_REPLACE_PEERS if all current
* peers should be removed prior to adding the list below.
* WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN, all zeros to remove
* WGDEVICE_A_LISTEN_PORT: NLA_U16, 0 to choose randomly
* WGDEVICE_A_FWMARK: NLA_U32, 0 to disable
* WGDEVICE_A_PEERS: NLA_NESTED
* 0: NLA_NESTED
* WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
* WGPEER_A_FLAGS: NLA_U32, 0 and/or WGPEER_F_REMOVE_ME if the specified peer
* should be removed rather than added/updated and/or
* WGPEER_F_REPLACE_ALLOWEDIPS if all current allowed IPs of
* this peer should be removed prior to adding the list below.
* WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN, all zeros to remove
* WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
* WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16, 0 to disable
* WGPEER_A_ALLOWEDIPS: NLA_NESTED
* 0: NLA_NESTED
* WGALLOWEDIP_A_FAMILY: NLA_U16
* WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
* WGALLOWEDIP_A_CIDR_MASK: NLA_U8
* 1: NLA_NESTED
* ...
* 2: NLA_NESTED
* ...
* ...
* 1: NLA_NESTED
* ...
* ...
*
* It is possible that the amount of configuration data exceeds that of
* the maximum message length accepted by the kernel. In that case,
* several messages should be sent one after another, with each
* successive one filling in information not contained in the prior. Note
* that if WGDEVICE_F_REPLACE_PEERS is specified in the first message, it
* probably should not be specified in fragments that come after, so that
* the list of peers is only cleared the first time but appened after.
* Likewise for peers, if WGPEER_F_REPLACE_ALLOWEDIPS is specified in the
* first message of a peer, it likely should not be specified in subsequent
* fragments.
*
* If an error occurs, NLMSG_ERROR will reply containing an errno.
*/
#ifndef _WG_UAPI_WIREGUARD_H
#define _WG_UAPI_WIREGUARD_H
#define WG_GENL_NAME "wireguard"
#define WG_GENL_VERSION 1
#define WG_KEY_LEN 32
enum wg_cmd {
WG_CMD_GET_DEVICE,
WG_CMD_SET_DEVICE,
__WG_CMD_MAX
};
#define WG_CMD_MAX (__WG_CMD_MAX - 1)
enum wgdevice_flag {
WGDEVICE_F_REPLACE_PEERS = 1U << 0
};
enum wgdevice_attribute {
WGDEVICE_A_UNSPEC,
WGDEVICE_A_IFINDEX,
WGDEVICE_A_IFNAME,
WGDEVICE_A_PRIVATE_KEY,
WGDEVICE_A_PUBLIC_KEY,
WGDEVICE_A_FLAGS,
WGDEVICE_A_LISTEN_PORT,
WGDEVICE_A_FWMARK,
WGDEVICE_A_PEERS,
__WGDEVICE_A_LAST
};
#define WGDEVICE_A_MAX (__WGDEVICE_A_LAST - 1)
enum wgpeer_flag {
WGPEER_F_REMOVE_ME = 1U << 0,
WGPEER_F_REPLACE_ALLOWEDIPS = 1U << 1
};
enum wgpeer_attribute {
WGPEER_A_UNSPEC,
WGPEER_A_PUBLIC_KEY,
WGPEER_A_PRESHARED_KEY,
WGPEER_A_FLAGS,
WGPEER_A_ENDPOINT,
WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
WGPEER_A_LAST_HANDSHAKE_TIME,
WGPEER_A_RX_BYTES,
WGPEER_A_TX_BYTES,
WGPEER_A_ALLOWEDIPS,
__WGPEER_A_LAST
};
#define WGPEER_A_MAX (__WGPEER_A_LAST - 1)
enum wgallowedip_attribute {
WGALLOWEDIP_A_UNSPEC,
WGALLOWEDIP_A_FAMILY,
WGALLOWEDIP_A_IPADDR,
WGALLOWEDIP_A_CIDR_MASK,
__WGALLOWEDIP_A_LAST
};
#define WGALLOWEDIP_A_MAX (__WGALLOWEDIP_A_LAST - 1)
#endif /* _WG_UAPI_WIREGUARD_H */
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