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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * L2TP-over-IP socket for L2TPv3.
4 *
5 * Author: James Chapman <jchapman@katalix.com>
6 */
7
8#ifndef _LINUX_L2TP_H_
9#define _LINUX_L2TP_H_
10
11#include <linux/types.h>
12#include <linux/socket.h>
13#include <linux/in.h>
14#include <linux/in6.h>
15
16/**
17 * struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
18 * @l2tp_family: address family number AF_L2TPIP.
19 * @l2tp_addr: protocol specific address information
20 * @l2tp_conn_id: connection id of tunnel
21 */
22#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */
23struct sockaddr_l2tpip {
24 /* The first fields must match struct sockaddr_in */
25 __kernel_sa_family_t l2tp_family; /* AF_INET */
26 __be16 l2tp_unused; /* INET port number (unused) */
27 struct in_addr l2tp_addr; /* Internet address */
28
29 __u32 l2tp_conn_id; /* Connection ID of tunnel */
30
31 /* Pad to size of `struct sockaddr'. */
32 unsigned char __pad[__SOCK_SIZE__ -
33 sizeof(__kernel_sa_family_t) -
34 sizeof(__be16) - sizeof(struct in_addr) -
35 sizeof(__u32)];
36};
37
38/**
39 * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
40 * @l2tp_family: address family number AF_L2TPIP.
41 * @l2tp_addr: protocol specific address information
42 * @l2tp_conn_id: connection id of tunnel
43 */
44struct sockaddr_l2tpip6 {
45 /* The first fields must match struct sockaddr_in6 */
46 __kernel_sa_family_t l2tp_family; /* AF_INET6 */
47 __be16 l2tp_unused; /* INET port number (unused) */
48 __be32 l2tp_flowinfo; /* IPv6 flow information */
49 struct in6_addr l2tp_addr; /* IPv6 address */
50 __u32 l2tp_scope_id; /* scope id (new in RFC2553) */
51 __u32 l2tp_conn_id; /* Connection ID of tunnel */
52};
53
54/*****************************************************************************
55 * NETLINK_GENERIC netlink family.
56 *****************************************************************************/
57
58/*
59 * Commands.
60 * Valid TLVs of each command are:-
61 * TUNNEL_CREATE - CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum
62 * TUNNEL_DELETE - CONN_ID
63 * TUNNEL_MODIFY - CONN_ID, udpcsum
64 * TUNNEL_GETSTATS - CONN_ID, (stats)
65 * TUNNEL_GET - CONN_ID, (...)
66 * SESSION_CREATE - SESSION_ID, PW_TYPE, cookie, peer_cookie, l2spec
67 * SESSION_DELETE - SESSION_ID
68 * SESSION_MODIFY - SESSION_ID
69 * SESSION_GET - SESSION_ID, (...)
70 * SESSION_GETSTATS - SESSION_ID, (stats)
71 *
72 */
73enum {
74 L2TP_CMD_NOOP,
75 L2TP_CMD_TUNNEL_CREATE,
76 L2TP_CMD_TUNNEL_DELETE,
77 L2TP_CMD_TUNNEL_MODIFY,
78 L2TP_CMD_TUNNEL_GET,
79 L2TP_CMD_SESSION_CREATE,
80 L2TP_CMD_SESSION_DELETE,
81 L2TP_CMD_SESSION_MODIFY,
82 L2TP_CMD_SESSION_GET,
83 __L2TP_CMD_MAX,
84};
85
86#define L2TP_CMD_MAX (__L2TP_CMD_MAX - 1)
87
88/*
89 * ATTR types defined for L2TP
90 */
91enum {
92 L2TP_ATTR_NONE, /* no data */
93 L2TP_ATTR_PW_TYPE, /* u16, enum l2tp_pwtype */
94 L2TP_ATTR_ENCAP_TYPE, /* u16, enum l2tp_encap_type */
95 L2TP_ATTR_OFFSET, /* u16 (not used) */
96 L2TP_ATTR_DATA_SEQ, /* u16 (not used) */
97 L2TP_ATTR_L2SPEC_TYPE, /* u8, enum l2tp_l2spec_type */
98 L2TP_ATTR_L2SPEC_LEN, /* u8 (not used) */
99 L2TP_ATTR_PROTO_VERSION, /* u8 */
100 L2TP_ATTR_IFNAME, /* string */
101 L2TP_ATTR_CONN_ID, /* u32 */
102 L2TP_ATTR_PEER_CONN_ID, /* u32 */
103 L2TP_ATTR_SESSION_ID, /* u32 */
104 L2TP_ATTR_PEER_SESSION_ID, /* u32 */
105 L2TP_ATTR_UDP_CSUM, /* u8 */
106 L2TP_ATTR_VLAN_ID, /* u16 (not used) */
107 L2TP_ATTR_COOKIE, /* 0, 4 or 8 bytes */
108 L2TP_ATTR_PEER_COOKIE, /* 0, 4 or 8 bytes */
109 L2TP_ATTR_DEBUG, /* u32, enum l2tp_debug_flags (not used) */
110 L2TP_ATTR_RECV_SEQ, /* u8 */
111 L2TP_ATTR_SEND_SEQ, /* u8 */
112 L2TP_ATTR_LNS_MODE, /* u8 */
113 L2TP_ATTR_USING_IPSEC, /* u8 */
114 L2TP_ATTR_RECV_TIMEOUT, /* msec */
115 L2TP_ATTR_FD, /* int */
116 L2TP_ATTR_IP_SADDR, /* u32 */
117 L2TP_ATTR_IP_DADDR, /* u32 */
118 L2TP_ATTR_UDP_SPORT, /* u16 */
119 L2TP_ATTR_UDP_DPORT, /* u16 */
120 L2TP_ATTR_MTU, /* u16 (not used) */
121 L2TP_ATTR_MRU, /* u16 (not used) */
122 L2TP_ATTR_STATS, /* nested */
123 L2TP_ATTR_IP6_SADDR, /* struct in6_addr */
124 L2TP_ATTR_IP6_DADDR, /* struct in6_addr */
125 L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* flag */
126 L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */
127 L2TP_ATTR_PAD,
128 __L2TP_ATTR_MAX,
129};
130
131#define L2TP_ATTR_MAX (__L2TP_ATTR_MAX - 1)
132
133/* Nested in L2TP_ATTR_STATS */
134enum {
135 L2TP_ATTR_STATS_NONE, /* no data */
136 L2TP_ATTR_TX_PACKETS, /* u64 */
137 L2TP_ATTR_TX_BYTES, /* u64 */
138 L2TP_ATTR_TX_ERRORS, /* u64 */
139 L2TP_ATTR_RX_PACKETS, /* u64 */
140 L2TP_ATTR_RX_BYTES, /* u64 */
141 L2TP_ATTR_RX_SEQ_DISCARDS, /* u64 */
142 L2TP_ATTR_RX_OOS_PACKETS, /* u64 */
143 L2TP_ATTR_RX_ERRORS, /* u64 */
144 L2TP_ATTR_STATS_PAD,
145 L2TP_ATTR_RX_COOKIE_DISCARDS, /* u64 */
146 L2TP_ATTR_RX_INVALID, /* u64 */
147 __L2TP_ATTR_STATS_MAX,
148};
149
150#define L2TP_ATTR_STATS_MAX (__L2TP_ATTR_STATS_MAX - 1)
151
152enum l2tp_pwtype {
153 L2TP_PWTYPE_NONE = 0x0000,
154 L2TP_PWTYPE_ETH_VLAN = 0x0004,
155 L2TP_PWTYPE_ETH = 0x0005,
156 L2TP_PWTYPE_PPP = 0x0007,
157 L2TP_PWTYPE_PPP_AC = 0x0008,
158 L2TP_PWTYPE_IP = 0x000b,
159 __L2TP_PWTYPE_MAX
160};
161
162enum l2tp_l2spec_type {
163 L2TP_L2SPECTYPE_NONE,
164 L2TP_L2SPECTYPE_DEFAULT,
165};
166
167enum l2tp_encap_type {
168 L2TP_ENCAPTYPE_UDP,
169 L2TP_ENCAPTYPE_IP,
170};
171
172/* For L2TP_ATTR_DATA_SEQ. Unused. */
173enum l2tp_seqmode {
174 L2TP_SEQ_NONE = 0,
175 L2TP_SEQ_IP = 1,
176 L2TP_SEQ_ALL = 2,
177};
178
179/**
180 * enum l2tp_debug_flags - debug message categories for L2TP tunnels/sessions.
181 *
182 * Unused.
183 *
184 * @L2TP_MSG_DEBUG: verbose debug (if compiled in)
185 * @L2TP_MSG_CONTROL: userspace - kernel interface
186 * @L2TP_MSG_SEQ: sequence numbers
187 * @L2TP_MSG_DATA: data packets
188 */
189enum l2tp_debug_flags {
190 L2TP_MSG_DEBUG = (1 << 0),
191 L2TP_MSG_CONTROL = (1 << 1),
192 L2TP_MSG_SEQ = (1 << 2),
193 L2TP_MSG_DATA = (1 << 3),
194};
195
196/*
197 * NETLINK_GENERIC related info
198 */
199#define L2TP_GENL_NAME "l2tp"
200#define L2TP_GENL_VERSION 0x1
201#define L2TP_GENL_MCGROUP "l2tp"
202
203#endif /* _LINUX_L2TP_H_ */