include/linux/if_pppol2tp.h

   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         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