1/***************************************************************************
2 * Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661)
3 *
4 * This file supplies definitions required by the PPP over L2TP driver
5 * (l2tp_ppp.c).  All version information wrt this file is located in l2tp_ppp.c
6 *
7 * License:
8 *		This program is free software; you can redistribute it and/or
9 *		modify it under the terms of the GNU General Public License
10 *		as published by the Free Software Foundation; either version
11 *		2 of the License, or (at your option) any later version.
12 *
13 */
14
15#ifndef _UAPI__LINUX_IF_PPPOL2TP_H
16#define _UAPI__LINUX_IF_PPPOL2TP_H
17
18#include <linux/types.h>
19
20
21/* Structure used to connect() the socket to a particular tunnel UDP
22 * socket over IPv4.
23 */
24struct pppol2tp_addr {
25	__kernel_pid_t	pid;		/* pid that owns the fd.
26					 * 0 => current */
27	int	fd;			/* FD of UDP socket to use */
28
29	struct sockaddr_in addr;	/* IP address and port to send to */
30
31	__u16 s_tunnel, s_session;	/* For matching incoming packets */
32	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
33};
34
35/* Structure used to connect() the socket to a particular tunnel UDP
36 * socket over IPv6.
37 */
38struct pppol2tpin6_addr {
39	__kernel_pid_t	pid;		/* pid that owns the fd.
40					 * 0 => current */
41	int	fd;			/* FD of UDP socket to use */
42
43	__u16 s_tunnel, s_session;	/* For matching incoming packets */
44	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
45
46	struct sockaddr_in6 addr;	/* IP address and port to send to */
47};
48
49/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
50 * bits. So we need a different sockaddr structure.
51 */
52struct pppol2tpv3_addr {
53	__kernel_pid_t	pid;		/* pid that owns the fd.
54					 * 0 => current */
55	int	fd;			/* FD of UDP or IP socket to use */
56
57	struct sockaddr_in addr;	/* IP address and port to send to */
58
59	__u32 s_tunnel, s_session;	/* For matching incoming packets */
60	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
61};
62
63struct pppol2tpv3in6_addr {
64	__kernel_pid_t	pid;		/* pid that owns the fd.
65					 * 0 => current */
66	int	fd;			/* FD of UDP or IP socket to use */
67
68	__u32 s_tunnel, s_session;	/* For matching incoming packets */
69	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
70
71	struct sockaddr_in6 addr;	/* IP address and port to send to */
72};
73
74/* Socket options:
75 * DEBUG	- bitmask of debug message categories
76 * SENDSEQ	- 0 => don't send packets with sequence numbers
77 *		  1 => send packets with sequence numbers
78 * RECVSEQ	- 0 => receive packet sequence numbers are optional
79 *		  1 => drop receive packets without sequence numbers
80 * LNSMODE	- 0 => act as LAC.
81 *		  1 => act as LNS.
82 * REORDERTO	- reorder timeout (in millisecs). If 0, don't try to reorder.
83 */
84enum {
85	PPPOL2TP_SO_DEBUG	= 1,
86	PPPOL2TP_SO_RECVSEQ	= 2,
87	PPPOL2TP_SO_SENDSEQ	= 3,
88	PPPOL2TP_SO_LNSMODE	= 4,
89	PPPOL2TP_SO_REORDERTO	= 5,
90};
91
92/* Debug message categories for the DEBUG socket option */
93enum {
94	PPPOL2TP_MSG_DEBUG	= (1 << 0),	/* verbose debug (if
95						 * compiled in) */
96	PPPOL2TP_MSG_CONTROL	= (1 << 1),	/* userspace - kernel
97						 * interface */
98	PPPOL2TP_MSG_SEQ	= (1 << 2),	/* sequence numbers */
99	PPPOL2TP_MSG_DATA	= (1 << 3),	/* data packets */
100};
101
102
103
104#endif /* _UAPI__LINUX_IF_PPPOL2TP_H */
105