release/src/router/ppp/include/linux/if_pppvar.h

   1 /*      From: if_pppvar.h,v 1.2 1995/06/12 11:36:51 paulus Exp */
   2 /*
   3  * if_pppvar.h - private structures and declarations for PPP.
   4  *
   5  * Copyright (c) 1994 The Australian National University.
   6  * All rights reserved.
   7  *
   8  * Permission to use, copy, modify, and distribute this software and its
   9  * documentation is hereby granted, provided that the above copyright
  10  * notice appears in all copies.  This software is provided without any
  11  * warranty, express or implied. The Australian National University
  12  * makes no representations about the suitability of this software for
  13  * any purpose.
  14  *
  15  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
  16  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  17  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
  18  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
  19  * OF SUCH DAMAGE.
  20  *
  21  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
  22  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  23  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  24  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
  25  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
  26  * OR MODIFICATIONS.
  27  *
  28  * Copyright (c) 1989 Carnegie Mellon University.
  29  * All rights reserved.
  30  *
  31  * Redistribution and use in source and binary forms are permitted
  32  * provided that the above copyright notice and this paragraph are
  33  * duplicated in all such forms and that any documentation,
  34  * advertising materials, and other materials related to such
  35  * distribution and use acknowledge that the software was developed
  36  * by Carnegie Mellon University.  The name of the
  37  * University may not be used to endorse or promote products derived
  38  * from this software without specific prior written permission.
  39  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  40  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  41  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  42  */
  43
  44 /*
  45  *  ==FILEVERSION 990911==
  46  *
  47  *  NOTE TO MAINTAINERS:
  48  *   If you modify this file at all, please set the above date.
  49  *   if_pppvar.h is shipped with a PPP distribution as well as with the kernel;
  50  *   if everyone increases the FILEVERSION number above, then scripts
  51  *   can do the right thing when deciding whether to install a new if_pppvar.h
  52  *   file.  Don't change the format of that line otherwise, so the
  53  *   installation script can recognize it.
  54  */
  55
  56 /*
  57  * Supported network protocols.  These values are used for
  58  * indexing sc_npmode.
  59  */
  60
  61 #define NP_IP   0               /* Internet Protocol */
  62 #define NP_IPX  1               /* IPX protocol */
  63 #define NP_AT   2               /* Appletalk protocol */
  64 #define NP_IPV6 3               /* Internet Protocol */
  65 #define NUM_NP  4               /* Number of NPs. */
  66
  67 #define OBUFSIZE        256     /* # chars of output buffering */
  68
  69 /*
  70  * Structure describing each ppp unit.
  71  */
  72
  73 struct ppp {
  74         int             magic;          /* magic value for structure    */
  75         struct ppp      *next;          /* unit with next index         */
  76         unsigned long   inuse;          /* are we allocated?            */
  77         int             line;           /* network interface unit #     */
  78         __u32           flags;          /* miscellaneous control flags  */
  79         int             mtu;            /* maximum xmit frame size      */
  80         int             mru;            /* maximum receive frame size   */
  81         struct slcompress *slcomp;      /* for TCP header compression   */
  82         struct sk_buff_head xmt_q;      /* frames to send from pppd     */
  83         struct sk_buff_head rcv_q;      /* frames for pppd to read      */
  84         unsigned long   xmit_busy;      /* bit 0 set when xmitter busy  */
  85
  86         /* Information specific to using ppp on async serial lines. */
  87         struct tty_struct *tty;         /* ptr to TTY structure */
  88         struct tty_struct *backup_tty;  /* TTY to use if tty gets closed */
  89         __u8            escape;         /* 0x20 if prev char was PPP_ESC */
  90         __u8            toss;           /* toss this frame              */
  91         volatile __u8   tty_pushing;    /* internal state flag          */
  92         volatile __u8   woke_up;        /* internal state flag          */
  93         __u32           xmit_async_map[8]; /* 1 bit means that given control
  94                                            character is quoted on output*/
  95         __u32           recv_async_map; /* 1 bit means that given control
  96                                            character is ignored on input*/
  97         __u32           bytes_sent;     /* Bytes sent on frame  */
  98         __u32           bytes_rcvd;     /* Bytes recvd on frame */
  99
 100         /* Async transmission information */
 101         struct sk_buff  *tpkt;          /* frame currently being sent   */
 102         int             tpkt_pos;       /* how much of it we've done    */
 103         __u16           tfcs;           /* FCS so far for it            */
 104         unsigned char   *optr;          /* where we're up to in sending */
 105         unsigned char   *olim;          /* points past last valid char  */
 106
 107         /* Async reception information */
 108         struct sk_buff  *rpkt;          /* frame currently being rcvd   */
 109         __u16           rfcs;           /* FCS so far of rpkt           */
 110
 111         /* Queues for select() functionality */
 112         struct wait_queue *read_wait;   /* queue for reading processes  */
 113
 114         /* info for detecting idle channels */
 115         unsigned long   last_xmit;      /* time of last transmission    */
 116         unsigned long   last_recv;      /* time last packet received    */
 117
 118         /* Statistic information */
 119         struct pppstat  stats;          /* statistic information        */
 120
 121         /* PPP compression protocol information */
 122         struct  compressor *sc_xcomp;   /* transmit compressor */
 123         void    *sc_xc_state;           /* transmit compressor state */
 124         struct  compressor *sc_rcomp;   /* receive decompressor */
 125         void    *sc_rc_state;           /* receive decompressor state */
 126
 127         enum    NPmode sc_npmode[NUM_NP]; /* what to do with each NP */
 128         int      sc_xfer;               /* PID of reserved PPP table */
 129         char    name[8];                /* space for unit name */
 130         struct device   dev;            /* net device structure */
 131         struct enet_statistics estats;  /* more detailed stats */
 132
 133         /* tty output buffer */
 134         unsigned char   obuf[OBUFSIZE]; /* buffer for characters to send */
 135 };
 136
 137 #define PPP_MAGIC       0x5002
 138 #define PPP_VERSION     "2.3.11"