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 _UAPI__LINUX_IF_PPPOL2TP_H 17 #define _UAPI__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 */ 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 /* Structure used to connect() the socket to a particular tunnel UDP 39 * socket over IPv6. 40 */ 41 struct 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 */ 55 struct 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 66 struct 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 */ 87 enum { 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) */ 96 enum { 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 /* _UAPI__LINUX_IF_PPPOL2TP_H */ 106