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 #endif 23 24 /* Structure used to connect() the socket to a particular tunnel UDP 25 * socket. 26 */ 27 struct 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 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32 39 * bits. So we need a different sockaddr structure. 40 */ 41 struct pppol2tpv3_addr { 42 __kernel_pid_t pid; /* pid that owns the fd. 43 * 0 => current */ 44 int fd; /* FD of UDP or IP socket to use */ 45 46 struct sockaddr_in addr; /* IP address and port to send to */ 47 48 __u32 s_tunnel, s_session; /* For matching incoming packets */ 49 __u32 d_tunnel, d_session; /* For sending outgoing packets */ 50 }; 51 52 /* Socket options: 53 * DEBUG - bitmask of debug message categories 54 * SENDSEQ - 0 => don't send packets with sequence numbers 55 * 1 => send packets with sequence numbers 56 * RECVSEQ - 0 => receive packet sequence numbers are optional 57 * 1 => drop receive packets without sequence numbers 58 * LNSMODE - 0 => act as LAC. 59 * 1 => act as LNS. 60 * REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder. 61 */ 62 enum { 63 PPPOL2TP_SO_DEBUG = 1, 64 PPPOL2TP_SO_RECVSEQ = 2, 65 PPPOL2TP_SO_SENDSEQ = 3, 66 PPPOL2TP_SO_LNSMODE = 4, 67 PPPOL2TP_SO_REORDERTO = 5, 68 }; 69 70 /* Debug message categories for the DEBUG socket option */ 71 enum { 72 PPPOL2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if 73 * compiled in) */ 74 PPPOL2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel 75 * interface */ 76 PPPOL2TP_MSG_SEQ = (1 << 2), /* sequence numbers */ 77 PPPOL2TP_MSG_DATA = (1 << 3), /* data packets */ 78 }; 79 80 81 82 #endif 83