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 #include <linux/in6.h>
  23 #endif
  24
  25 /* Structure used to connect() the socket to a particular tunnel UDP
  26  * socket over IPv4.
  27  */
  28 struct pppol2tp_addr {
  29         __kernel_pid_t  pid;            /* pid that owns the fd.
  30                                          * 0 => current */
  31         int     fd;                     /* FD of UDP socket to use */
  32
  33         struct sockaddr_in addr;        /* IP address and port to send to */
  34
  35         __u16 s_tunnel, s_session;      /* For matching incoming packets */
  36         __u16 d_tunnel, d_session;      /* For sending outgoing packets */
  37 };
  38
  39 /* Structure used to connect() the socket to a particular tunnel UDP
  40  * socket over IPv6.
  41  */
  42 struct pppol2tpin6_addr {
  43         __kernel_pid_t  pid;            /* pid that owns the fd.
  44                                          * 0 => current */
  45         int     fd;                     /* FD of UDP socket to use */
  46
  47         __u16 s_tunnel, s_session;      /* For matching incoming packets */
  48         __u16 d_tunnel, d_session;      /* For sending outgoing packets */
  49
  50         struct sockaddr_in6 addr;       /* IP address and port to send to */
  51 };
  52
  53 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
  54  * bits. So we need a different sockaddr structure.
  55  */
  56 struct pppol2tpv3_addr {
  57         __kernel_pid_t  pid;            /* pid that owns the fd.
  58                                          * 0 => current */
  59         int     fd;                     /* FD of UDP or IP socket to use */
  60
  61         struct sockaddr_in addr;        /* IP address and port to send to */
  62
  63         __u32 s_tunnel, s_session;      /* For matching incoming packets */
  64         __u32 d_tunnel, d_session;      /* For sending outgoing packets */
  65 };
  66
  67 struct pppol2tpv3in6_addr {
  68         __kernel_pid_t  pid;            /* pid that owns the fd.
  69                                          * 0 => current */
  70         int     fd;                     /* FD of UDP or IP socket to use */
  71
  72         __u32 s_tunnel, s_session;      /* For matching incoming packets */
  73         __u32 d_tunnel, d_session;      /* For sending outgoing packets */
  74
  75         struct sockaddr_in6 addr;       /* IP address and port to send to */
  76 };
  77
  78 /* Socket options:
  79  * DEBUG        - bitmask of debug message categories
  80  * SENDSEQ      - 0 => don't send packets with sequence numbers
  81  *                1 => send packets with sequence numbers
  82  * RECVSEQ      - 0 => receive packet sequence numbers are optional
  83  *                1 => drop receive packets without sequence numbers
  84  * LNSMODE      - 0 => act as LAC.
  85  *                1 => act as LNS.
  86  * REORDERTO    - reorder timeout (in millisecs). If 0, don't try to reorder.
  87  */
  88 enum {
  89         PPPOL2TP_SO_DEBUG       = 1,
  90         PPPOL2TP_SO_RECVSEQ     = 2,
  91         PPPOL2TP_SO_SENDSEQ     = 3,
  92         PPPOL2TP_SO_LNSMODE     = 4,
  93         PPPOL2TP_SO_REORDERTO   = 5,
  94 };
  95
  96 /* Debug message categories for the DEBUG socket option */
  97 enum {
  98         PPPOL2TP_MSG_DEBUG      = (1 << 0),     /* verbose debug (if
  99                                                  * compiled in) */
 100         PPPOL2TP_MSG_CONTROL    = (1 << 1),     /* userspace - kernel
 101                                                  * interface */
 102         PPPOL2TP_MSG_SEQ        = (1 << 2),     /* sequence numbers */
 103         PPPOL2TP_MSG_DATA       = (1 << 3),     /* data packets */
 104 };
 105
 106
 107
 108 #endif