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 __LINUX_IF_PPPOL2TP_H
17#define __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 /* __LINUX_IF_PPPOL2TP_H */