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 */ 28 struct 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 */ 42 struct 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 */ 56 struct 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 67 struct 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 */ 88 enum { 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 */ 97 enum { 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 109