1/*
2 * L2TP-over-IP socket for L2TPv3.
3 *
4 * Author: James Chapman <jchapman@katalix.com>
5 */
6
7#ifndef _LINUX_L2TP_H_
8#define _LINUX_L2TP_H_
9
10#include <linux/types.h>
11#include <linux/socket.h>
12#include <netinet/in.h>
13
14#define IPPROTO_L2TP		115
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[sizeof(struct sockaddr) -
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, vlanid
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, offset, data_seq, cookie, peer_cookie, offset, l2spec
67 * SESSION_DELETE	- SESSION_ID
68 * SESSION_MODIFY	- SESSION_ID, data_seq
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 */
96	L2TP_ATTR_DATA_SEQ,		/* u16 */
97	L2TP_ATTR_L2SPEC_TYPE,		/* u8, enum l2tp_l2spec_type */
98	L2TP_ATTR_L2SPEC_LEN,		/* u8, enum l2tp_l2spec_type */
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 */
107	L2TP_ATTR_COOKIE,		/* 0, 4 or 8 bytes */
108	L2TP_ATTR_PEER_COOKIE,		/* 0, 4 or 8 bytes */
109	L2TP_ATTR_DEBUG,		/* u32 */
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 */
121	L2TP_ATTR_MRU,			/* u16 */
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,	/* u8 */
126	L2TP_ATTR_UDP_ZERO_CSUM6_RX,	/* u8 */
127	__L2TP_ATTR_MAX,
128};
129
130#define L2TP_ATTR_MAX			(__L2TP_ATTR_MAX - 1)
131
132/* Nested in L2TP_ATTR_STATS */
133enum {
134	L2TP_ATTR_STATS_NONE,		/* no data */
135	L2TP_ATTR_TX_PACKETS,		/* u64 */
136	L2TP_ATTR_TX_BYTES,		/* u64 */
137	L2TP_ATTR_TX_ERRORS,		/* u64 */
138	L2TP_ATTR_RX_PACKETS,		/* u64 */
139	L2TP_ATTR_RX_BYTES,		/* u64 */
140	L2TP_ATTR_RX_SEQ_DISCARDS,	/* u64 */
141	L2TP_ATTR_RX_OOS_PACKETS,	/* u64 */
142	L2TP_ATTR_RX_ERRORS,		/* u64 */
143	__L2TP_ATTR_STATS_MAX,
144};
145
146#define L2TP_ATTR_STATS_MAX		(__L2TP_ATTR_STATS_MAX - 1)
147
148enum l2tp_pwtype {
149	L2TP_PWTYPE_NONE = 0x0000,
150	L2TP_PWTYPE_ETH_VLAN = 0x0004,
151	L2TP_PWTYPE_ETH = 0x0005,
152	L2TP_PWTYPE_PPP = 0x0007,
153	L2TP_PWTYPE_PPP_AC = 0x0008,
154	L2TP_PWTYPE_IP = 0x000b,
155	__L2TP_PWTYPE_MAX
156};
157
158enum l2tp_l2spec_type {
159	L2TP_L2SPECTYPE_NONE,
160	L2TP_L2SPECTYPE_DEFAULT,
161};
162
163enum l2tp_encap_type {
164	L2TP_ENCAPTYPE_UDP,
165	L2TP_ENCAPTYPE_IP,
166};
167
168enum l2tp_seqmode {
169	L2TP_SEQ_NONE = 0,
170	L2TP_SEQ_IP = 1,
171	L2TP_SEQ_ALL = 2,
172};
173
174/*
175 * NETLINK_GENERIC related info
176 */
177#define L2TP_GENL_NAME		"l2tp"
178#define L2TP_GENL_VERSION	0x1
179#define L2TP_GENL_MCGROUP       "l2tp"
180
181#endif /* _LINUX_L2TP_H_ */
182