/* 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. *
*/
/* 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,
};
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