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 _UAPI__LINUX_IF_PPPOL2TP_H 16 #define _UAPI__LINUX_IF_PPPOL2TP_H 17 18 #include <linux/types.h> 19 20 21 /* Structure used to connect() the socket to a particular tunnel UDP 22 * socket over IPv4. 23 */ 24 struct pppol2tp_addr { 25 __kernel_pid_t pid; /* pid that owns the fd. 26 * 0 => current */ 27 int fd; /* FD of UDP socket to use */ 28 29 struct sockaddr_in addr; /* IP address and port to send to */ 30 31 __u16 s_tunnel, s_session; /* For matching incoming packets */ 32 __u16 d_tunnel, d_session; /* For sending outgoing packets */ 33 }; 34 35 /* Structure used to connect() the socket to a particular tunnel UDP 36 * socket over IPv6. 37 */ 38 struct pppol2tpin6_addr { 39 __kernel_pid_t pid; /* pid that owns the fd. 40 * 0 => current */ 41 int fd; /* FD of UDP socket to use */ 42 43 __u16 s_tunnel, s_session; /* For matching incoming packets */ 44 __u16 d_tunnel, d_session; /* For sending outgoing packets */ 45 46 struct sockaddr_in6 addr; /* IP address and port to send to */ 47 }; 48 49 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32 50 * bits. So we need a different sockaddr structure. 51 */ 52 struct pppol2tpv3_addr { 53 __kernel_pid_t pid; /* pid that owns the fd. 54 * 0 => current */ 55 int fd; /* FD of UDP or IP socket to use */ 56 57 struct sockaddr_in addr; /* IP address and port to send to */ 58 59 __u32 s_tunnel, s_session; /* For matching incoming packets */ 60 __u32 d_tunnel, d_session; /* For sending outgoing packets */ 61 }; 62 63 struct pppol2tpv3in6_addr { 64 __kernel_pid_t pid; /* pid that owns the fd. 65 * 0 => current */ 66 int fd; /* FD of UDP or IP socket to use */ 67 68 __u32 s_tunnel, s_session; /* For matching incoming packets */ 69 __u32 d_tunnel, d_session; /* For sending outgoing packets */ 70 71 struct sockaddr_in6 addr; /* IP address and port to send to */ 72 }; 73 74 /* Socket options: 75 * DEBUG - bitmask of debug message categories 76 * SENDSEQ - 0 => don't send packets with sequence numbers 77 * 1 => send packets with sequence numbers 78 * RECVSEQ - 0 => receive packet sequence numbers are optional 79 * 1 => drop receive packets without sequence numbers 80 * LNSMODE - 0 => act as LAC. 81 * 1 => act as LNS. 82 * REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder. 83 */ 84 enum { 85 PPPOL2TP_SO_DEBUG = 1, 86 PPPOL2TP_SO_RECVSEQ = 2, 87 PPPOL2TP_SO_SENDSEQ = 3, 88 PPPOL2TP_SO_LNSMODE = 4, 89 PPPOL2TP_SO_REORDERTO = 5, 90 }; 91 92 /* Debug message categories for the DEBUG socket option */ 93 enum { 94 PPPOL2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if 95 * compiled in) */ 96 PPPOL2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel 97 * interface */ 98 PPPOL2TP_MSG_SEQ = (1 << 2), /* sequence numbers */ 99 PPPOL2TP_MSG_DATA = (1 << 3), /* data packets */ 100 }; 101 102 103 104 #endif /* _UAPI__LINUX_IF_PPPOL2TP_H */ 105