/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /*************************************************************************** * Linux PPP over L2TP (PPPoL2TP) Socket Implementation (RFC 2661) * * This file supplies definitions required by the PPP over L2TP driver * (l2tp_ppp.c). All version information wrt this file is located in l2tp_ppp.c * * License: * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #ifndef __LINUX_IF_PPPOL2TP_H #define __LINUX_IF_PPPOL2TP_H #include <linux/types.h> #include <linux/in.h> #include <linux/in6.h> #include <linux/l2tp.h> /* Structure used to connect() the socket to a particular tunnel UDP * socket over IPv4. */ struct pppol2tp_addr { __kernel_pid_t pid; /* pid that owns the fd. * 0 => current */ int fd; /* FD of UDP socket to use */ struct sockaddr_in addr; /* IP address and port to send to */ __u16 s_tunnel, s_session; /* For matching incoming packets */ __u16 d_tunnel, d_session; /* For sending outgoing packets */ }; /* Structure used to connect() the socket to a particular tunnel UDP * socket over IPv6. */ struct pppol2tpin6_addr { __kernel_pid_t pid; /* pid that owns the fd. * 0 => current */ int fd; /* FD of UDP socket to use */ __u16 s_tunnel, s_session; /* For matching incoming packets */ __u16 d_tunnel, d_session; /* For sending outgoing packets */ struct sockaddr_in6 addr; /* IP address and port to send to */ }; /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32 * bits. So we need a different sockaddr structure. */ struct pppol2tpv3_addr { __kernel_pid_t pid; /* pid that owns the fd. * 0 => current */ int fd; /* FD of UDP or IP socket to use */ struct sockaddr_in addr; /* IP address and port to send to */ __u32 s_tunnel, s_session; /* For matching incoming packets */ __u32 d_tunnel, d_session; /* For sending outgoing packets */ }; struct pppol2tpv3in6_addr { __kernel_pid_t pid; /* pid that owns the fd. * 0 => current */ int fd; /* FD of UDP or IP socket to use */ __u32 s_tunnel, s_session; /* For matching incoming packets */ __u32 d_tunnel, d_session; /* For sending outgoing packets */ struct sockaddr_in6 addr; /* IP address and port to send to */ }; /* Socket options: * DEBUG - bitmask of debug message categories (not used) * SENDSEQ - 0 => don't send packets with sequence numbers * 1 => send packets with sequence numbers * RECVSEQ - 0 => receive packet sequence numbers are optional * 1 => drop receive packets without sequence numbers * LNSMODE - 0 => act as LAC. * 1 => act as LNS. * REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder. */ enum { PPPOL2TP_SO_DEBUG = 1, PPPOL2TP_SO_RECVSEQ = 2, PPPOL2TP_SO_SENDSEQ = 3, PPPOL2TP_SO_LNSMODE = 4, PPPOL2TP_SO_REORDERTO = 5, }; /* Debug message categories for the DEBUG socket option (deprecated) */ enum { PPPOL2TP_MSG_DEBUG = L2TP_MSG_DEBUG, PPPOL2TP_MSG_CONTROL = L2TP_MSG_CONTROL, PPPOL2TP_MSG_SEQ = L2TP_MSG_SEQ, PPPOL2TP_MSG_DATA = L2TP_MSG_DATA, }; #endif /* __LINUX_IF_PPPOL2TP_H */