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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 __LINUX_IF_PPPOL2TP_H
16#define __LINUX_IF_PPPOL2TP_H
17
18#include <linux/types.h>
19
20#ifdef __KERNEL__
21#include <linux/in.h>
22#include <linux/in6.h>
23#endif
24
25/* Structure used to connect() the socket to a particular tunnel UDP
26 * socket over IPv4.
27 */
28struct pppol2tp_addr {
29 __kernel_pid_t pid; /* pid that owns the fd.
30 * 0 => current */
31 int fd; /* FD of UDP socket to use */
32
33 struct sockaddr_in addr; /* IP address and port to send to */
34
35 __u16 s_tunnel, s_session; /* For matching incoming packets */
36 __u16 d_tunnel, d_session; /* For sending outgoing packets */
37};
38
39/* Structure used to connect() the socket to a particular tunnel UDP
40 * socket over IPv6.
41 */
42struct pppol2tpin6_addr {
43 __kernel_pid_t pid; /* pid that owns the fd.
44 * 0 => current */
45 int fd; /* FD of UDP socket to use */
46
47 __u16 s_tunnel, s_session; /* For matching incoming packets */
48 __u16 d_tunnel, d_session; /* For sending outgoing packets */
49
50 struct sockaddr_in6 addr; /* IP address and port to send to */
51};
52
53/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
54 * bits. So we need a different sockaddr structure.
55 */
56struct pppol2tpv3_addr {
57 __kernel_pid_t pid; /* pid that owns the fd.
58 * 0 => current */
59 int fd; /* FD of UDP or IP socket to use */
60
61 struct sockaddr_in addr; /* IP address and port to send to */
62
63 __u32 s_tunnel, s_session; /* For matching incoming packets */
64 __u32 d_tunnel, d_session; /* For sending outgoing packets */
65};
66
67struct pppol2tpv3in6_addr {
68 __kernel_pid_t pid; /* pid that owns the fd.
69 * 0 => current */
70 int fd; /* FD of UDP or IP socket to use */
71
72 __u32 s_tunnel, s_session; /* For matching incoming packets */
73 __u32 d_tunnel, d_session; /* For sending outgoing packets */
74
75 struct sockaddr_in6 addr; /* IP address and port to send to */
76};
77
78/* Socket options:
79 * DEBUG - bitmask of debug message categories
80 * SENDSEQ - 0 => don't send packets with sequence numbers
81 * 1 => send packets with sequence numbers
82 * RECVSEQ - 0 => receive packet sequence numbers are optional
83 * 1 => drop receive packets without sequence numbers
84 * LNSMODE - 0 => act as LAC.
85 * 1 => act as LNS.
86 * REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder.
87 */
88enum {
89 PPPOL2TP_SO_DEBUG = 1,
90 PPPOL2TP_SO_RECVSEQ = 2,
91 PPPOL2TP_SO_SENDSEQ = 3,
92 PPPOL2TP_SO_LNSMODE = 4,
93 PPPOL2TP_SO_REORDERTO = 5,
94};
95
96/* Debug message categories for the DEBUG socket option */
97enum {
98 PPPOL2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
99 * compiled in) */
100 PPPOL2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
101 * interface */
102 PPPOL2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
103 PPPOL2TP_MSG_DATA = (1 << 3), /* data packets */
104};
105
106
107
108#endif