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wireguard.h
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */ /* * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. * * 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 IFNAMSIZ - 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 IFNAMSIZ - 1 * WGDEVICE_A_PRIVATE_KEY: NLA_EXACT_LEN, len WG_KEY_LEN * WGDEVICE_A_PUBLIC_KEY: NLA_EXACT_LEN, 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: NLA_EXACT_LEN, len WG_KEY_LEN * WGPEER_A_PRESHARED_KEY: NLA_EXACT_LEN, len WG_KEY_LEN * WGPEER_A_ENDPOINT: NLA_MIN_LEN(struct sockaddr), struct sockaddr_in or struct sockaddr_in6 * WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16 * WGPEER_A_LAST_HANDSHAKE_TIME: NLA_EXACT_LEN, struct __kernel_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: NLA_MIN_LEN(struct in_addr), struct in_addr or struct in6_addr * WGALLOWEDIP_A_CIDR_MASK: NLA_U8 * 0: NLA_NESTED * ... * 0: NLA_NESTED * ... * ... * WGPEER_A_PROTOCOL_VERSION: NLA_U32 * 0: 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 IFNAMSIZ - 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 not exist at the end of the * operation, 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 and/or WGPEER_F_UPDATE_ONLY if the * peer should only be set if it already exists. * 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 * 0: NLA_NESTED * ... * 0: NLA_NESTED * ... * ... * WGPEER_A_PROTOCOL_VERSION: NLA_U32, should not be set or used at * all by most users of this API, as the * most recent protocol will be used when * this is unset. Otherwise, must be set * to 1. * 0: 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 appended 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, __WGDEVICE_F_ALL = WGDEVICE_F_REPLACE_PEERS }; 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, WGPEER_F_UPDATE_ONLY = 1U << 2, __WGPEER_F_ALL = WGPEER_F_REMOVE_ME | WGPEER_F_REPLACE_ALLOWEDIPS | WGPEER_F_UPDATE_ONLY }; 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_PROTOCOL_VERSION, __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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