linux-headers (unknown)
1 /* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
2 /*
3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4 *
5 * Documentation
6 * =============
7 *
8 * The below enums and macros are for interfacing with WireGuard, using generic
9 * netlink, with family WG_GENL_NAME and version WG_GENL_VERSION. It defines two
10 * methods: get and set. Note that while they share many common attributes,
11 * these two functions actually accept a slightly different set of inputs and
12 * outputs.
13 *
14 * WG_CMD_GET_DEVICE
15 * -----------------
16 *
17 * May only be called via NLM_F_REQUEST | NLM_F_DUMP. The command should contain
18 * one but not both of:
19 *
20 * WGDEVICE_A_IFINDEX: NLA_U32
21 * WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
22 *
23 * The kernel will then return several messages (NLM_F_MULTI) containing the
24 * following tree of nested items:
25 *
26 * WGDEVICE_A_IFINDEX: NLA_U32
27 * WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
28 * WGDEVICE_A_PRIVATE_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
29 * WGDEVICE_A_PUBLIC_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
30 * WGDEVICE_A_LISTEN_PORT: NLA_U16
31 * WGDEVICE_A_FWMARK: NLA_U32
32 * WGDEVICE_A_PEERS: NLA_NESTED
33 * 0: NLA_NESTED
34 * WGPEER_A_PUBLIC_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
35 * WGPEER_A_PRESHARED_KEY: NLA_EXACT_LEN, len WG_KEY_LEN
36 * WGPEER_A_ENDPOINT: NLA_MIN_LEN(struct sockaddr), struct sockaddr_in or struct sockaddr_in6
37 * WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16
38 * WGPEER_A_LAST_HANDSHAKE_TIME: NLA_EXACT_LEN, struct __kernel_timespec
39 * WGPEER_A_RX_BYTES: NLA_U64
40 * WGPEER_A_TX_BYTES: NLA_U64
41 * WGPEER_A_ALLOWEDIPS: NLA_NESTED
42 * 0: NLA_NESTED
43 * WGALLOWEDIP_A_FAMILY: NLA_U16
44 * WGALLOWEDIP_A_IPADDR: NLA_MIN_LEN(struct in_addr), struct in_addr or struct in6_addr
45 * WGALLOWEDIP_A_CIDR_MASK: NLA_U8
46 * 0: NLA_NESTED
47 * ...
48 * 0: NLA_NESTED
49 * ...
50 * ...
51 * WGPEER_A_PROTOCOL_VERSION: NLA_U32
52 * 0: NLA_NESTED
53 * ...
54 * ...
55 *
56 * It is possible that all of the allowed IPs of a single peer will not
57 * fit within a single netlink message. In that case, the same peer will
58 * be written in the following message, except it will only contain
59 * WGPEER_A_PUBLIC_KEY and WGPEER_A_ALLOWEDIPS. This may occur several
60 * times in a row for the same peer. It is then up to the receiver to
61 * coalesce adjacent peers. Likewise, it is possible that all peers will
62 * not fit within a single message. So, subsequent peers will be sent
63 * in following messages, except those will only contain WGDEVICE_A_IFNAME
64 * and WGDEVICE_A_PEERS. It is then up to the receiver to coalesce these
65 * messages to form the complete list of peers.
66 *
67 * Since this is an NLA_F_DUMP command, the final message will always be
68 * NLMSG_DONE, even if an error occurs. However, this NLMSG_DONE message
69 * contains an integer error code. It is either zero or a negative error
70 * code corresponding to the errno.
71 *
72 * WG_CMD_SET_DEVICE
73 * -----------------
74 *
75 * May only be called via NLM_F_REQUEST. The command should contain the
76 * following tree of nested items, containing one but not both of
77 * WGDEVICE_A_IFINDEX and WGDEVICE_A_IFNAME:
78 *
79 * WGDEVICE_A_IFINDEX: NLA_U32
80 * WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMSIZ - 1
81 * WGDEVICE_A_FLAGS: NLA_U32, 0 or WGDEVICE_F_REPLACE_PEERS if all current
82 * peers should be removed prior to adding the list below.
83 * WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN, all zeros to remove
84 * WGDEVICE_A_LISTEN_PORT: NLA_U16, 0 to choose randomly
85 * WGDEVICE_A_FWMARK: NLA_U32, 0 to disable
86 * WGDEVICE_A_PEERS: NLA_NESTED
87 * 0: NLA_NESTED
88 * WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
89 * WGPEER_A_FLAGS: NLA_U32, 0 and/or WGPEER_F_REMOVE_ME if the
90 * specified peer should not exist at the end of the
91 * operation, rather than added/updated and/or
92 * WGPEER_F_REPLACE_ALLOWEDIPS if all current allowed
93 * IPs of this peer should be removed prior to adding
94 * the list below and/or WGPEER_F_UPDATE_ONLY if the
95 * peer should only be set if it already exists.
96 * WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN, all zeros to remove
97 * WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
98 * WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16, 0 to disable
99 * WGPEER_A_ALLOWEDIPS: NLA_NESTED
100 * 0: NLA_NESTED
101 * WGALLOWEDIP_A_FAMILY: NLA_U16
102 * WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
103 * WGALLOWEDIP_A_CIDR_MASK: NLA_U8
104 * 0: NLA_NESTED
105 * ...
106 * 0: NLA_NESTED
107 * ...
108 * ...
109 * WGPEER_A_PROTOCOL_VERSION: NLA_U32, should not be set or used at
110 * all by most users of this API, as the
111 * most recent protocol will be used when
112 * this is unset. Otherwise, must be set
113 * to 1.
114 * 0: NLA_NESTED
115 * ...
116 * ...
117 *
118 * It is possible that the amount of configuration data exceeds that of
119 * the maximum message length accepted by the kernel. In that case, several
120 * messages should be sent one after another, with each successive one
121 * filling in information not contained in the prior. Note that if
122 * WGDEVICE_F_REPLACE_PEERS is specified in the first message, it probably
123 * should not be specified in fragments that come after, so that the list
124 * of peers is only cleared the first time but appended after. Likewise for
125 * peers, if WGPEER_F_REPLACE_ALLOWEDIPS is specified in the first message
126 * of a peer, it likely should not be specified in subsequent fragments.
127 *
128 * If an error occurs, NLMSG_ERROR will reply containing an errno.
129 */
130
131 #ifndef _WG_UAPI_WIREGUARD_H
132 #define _WG_UAPI_WIREGUARD_H
133
134 #define WG_GENL_NAME "wireguard"
135 #define WG_GENL_VERSION 1
136
137 #define WG_KEY_LEN 32
138
139 enum wg_cmd {
140 WG_CMD_GET_DEVICE,
141 WG_CMD_SET_DEVICE,
142 __WG_CMD_MAX
143 };
144 #define WG_CMD_MAX (__WG_CMD_MAX - 1)
145
146 enum wgdevice_flag {
147 WGDEVICE_F_REPLACE_PEERS = 1U << 0,
148 __WGDEVICE_F_ALL = WGDEVICE_F_REPLACE_PEERS
149 };
150 enum wgdevice_attribute {
151 WGDEVICE_A_UNSPEC,
152 WGDEVICE_A_IFINDEX,
153 WGDEVICE_A_IFNAME,
154 WGDEVICE_A_PRIVATE_KEY,
155 WGDEVICE_A_PUBLIC_KEY,
156 WGDEVICE_A_FLAGS,
157 WGDEVICE_A_LISTEN_PORT,
158 WGDEVICE_A_FWMARK,
159 WGDEVICE_A_PEERS,
160 __WGDEVICE_A_LAST
161 };
162 #define WGDEVICE_A_MAX (__WGDEVICE_A_LAST - 1)
163
164 enum wgpeer_flag {
165 WGPEER_F_REMOVE_ME = 1U << 0,
166 WGPEER_F_REPLACE_ALLOWEDIPS = 1U << 1,
167 WGPEER_F_UPDATE_ONLY = 1U << 2,
168 __WGPEER_F_ALL = WGPEER_F_REMOVE_ME | WGPEER_F_REPLACE_ALLOWEDIPS |
169 WGPEER_F_UPDATE_ONLY
170 };
171 enum wgpeer_attribute {
172 WGPEER_A_UNSPEC,
173 WGPEER_A_PUBLIC_KEY,
174 WGPEER_A_PRESHARED_KEY,
175 WGPEER_A_FLAGS,
176 WGPEER_A_ENDPOINT,
177 WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
178 WGPEER_A_LAST_HANDSHAKE_TIME,
179 WGPEER_A_RX_BYTES,
180 WGPEER_A_TX_BYTES,
181 WGPEER_A_ALLOWEDIPS,
182 WGPEER_A_PROTOCOL_VERSION,
183 __WGPEER_A_LAST
184 };
185 #define WGPEER_A_MAX (__WGPEER_A_LAST - 1)
186
187 enum wgallowedip_attribute {
188 WGALLOWEDIP_A_UNSPEC,
189 WGALLOWEDIP_A_FAMILY,
190 WGALLOWEDIP_A_IPADDR,
191 WGALLOWEDIP_A_CIDR_MASK,
192 __WGALLOWEDIP_A_LAST
193 };
194 #define WGALLOWEDIP_A_MAX (__WGALLOWEDIP_A_LAST - 1)
195
196 #endif /* _WG_UAPI_WIREGUARD_H */
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