1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/***************************************************************************
3 * Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661)
4 *
5 * This file supplies definitions required by the PPP over L2TP driver
6 * (l2tp_ppp.c).  All version information wrt this file is located in l2tp_ppp.c
7 *
8 * License:
9 *		This program is free software; you can redistribute it and/or
10 *		modify it under the terms of the GNU General Public License
11 *		as published by the Free Software Foundation; either version
12 *		2 of the License, or (at your option) any later version.
13 *
14 */
15
16#ifndef _UAPI__LINUX_IF_PPPOL2TP_H
17#define _UAPI__LINUX_IF_PPPOL2TP_H
18
19#include <linux/types.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <linux/l2tp.h>
23
24/* Structure used to connect() the socket to a particular tunnel UDP
25 * socket over IPv4.
26 */
27struct pppol2tp_addr {
28	__kernel_pid_t	pid;		/* pid that owns the fd.
29					 * 0 => current */
30	int	fd;			/* FD of UDP socket to use */
31
32	struct sockaddr_in addr;	/* IP address and port to send to */
33
34	__u16 s_tunnel, s_session;	/* For matching incoming packets */
35	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
36};
37
38/* Structure used to connect() the socket to a particular tunnel UDP
39 * socket over IPv6.
40 */
41struct pppol2tpin6_addr {
42	__kernel_pid_t	pid;		/* pid that owns the fd.
43					 * 0 => current */
44	int	fd;			/* FD of UDP socket to use */
45
46	__u16 s_tunnel, s_session;	/* For matching incoming packets */
47	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
48
49	struct sockaddr_in6 addr;	/* IP address and port to send to */
50};
51
52/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
53 * bits. So we need a different sockaddr structure.
54 */
55struct pppol2tpv3_addr {
56	__kernel_pid_t	pid;		/* pid that owns the fd.
57					 * 0 => current */
58	int	fd;			/* FD of UDP or IP socket to use */
59
60	struct sockaddr_in addr;	/* IP address and port to send to */
61
62	__u32 s_tunnel, s_session;	/* For matching incoming packets */
63	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
64};
65
66struct pppol2tpv3in6_addr {
67	__kernel_pid_t	pid;		/* pid that owns the fd.
68					 * 0 => current */
69	int	fd;			/* FD of UDP or IP socket to use */
70
71	__u32 s_tunnel, s_session;	/* For matching incoming packets */
72	__u32 d_tunnel, d_session;	/* For sending outgoing packets */
73
74	struct sockaddr_in6 addr;	/* IP address and port to send to */
75};
76
77/* Socket options:
78 * DEBUG	- bitmask of debug message categories (not used)
79 * SENDSEQ	- 0 => don't send packets with sequence numbers
80 *		  1 => send packets with sequence numbers
81 * RECVSEQ	- 0 => receive packet sequence numbers are optional
82 *		  1 => drop receive packets without sequence numbers
83 * LNSMODE	- 0 => act as LAC.
84 *		  1 => act as LNS.
85 * REORDERTO	- reorder timeout (in millisecs). If 0, don't try to reorder.
86 */
87enum {
88	PPPOL2TP_SO_DEBUG	= 1,
89	PPPOL2TP_SO_RECVSEQ	= 2,
90	PPPOL2TP_SO_SENDSEQ	= 3,
91	PPPOL2TP_SO_LNSMODE	= 4,
92	PPPOL2TP_SO_REORDERTO	= 5,
93};
94
95/* Debug message categories for the DEBUG socket option (deprecated) */
96enum {
97	PPPOL2TP_MSG_DEBUG	= L2TP_MSG_DEBUG,
98	PPPOL2TP_MSG_CONTROL	= L2TP_MSG_CONTROL,
99	PPPOL2TP_MSG_SEQ	= L2TP_MSG_SEQ,
100	PPPOL2TP_MSG_DATA	= L2TP_MSG_DATA,
101};
102
103
104
105#endif /* _UAPI__LINUX_IF_PPPOL2TP_H */
106