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/*      From: if_pppvar.h,v 1.2 1995/06/12 11:36:51 paulus Exp */
/*
 * if_pppvar.h - private structures and declarations for PPP.
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */


/*
 *  ==FILEVERSION 990806==
 *
 *  NOTE TO MAINTAINERS:
 *   If you modify this file at all, please set the above date.
 *   if_pppvar.h is shipped with a PPP distribution as well as with the kernel;
 *   if everyone increases the FILEVERSION number above, then scripts
 *   can do the right thing when deciding whether to install a new if_pppvar.h
 *   file.  Don't change the format of that line otherwise, so the
 *   installation script can recognize it.
 */


/*
 * Supported network protocols.  These values are used for
 * indexing sc_npmode.
 */


#define NP_IP   0               /* Internet Protocol */
#define NP_IPX  1               /* IPX protocol */
#define NP_AT   2               /* Appletalk protocol */
#define NP_IPV6 3               /* Internet Protocol */
#define NUM_NP  4               /* Number of NPs. */

#define OBUFSIZE        256     /* # chars of output buffering */

/*
 * Structure describing each ppp unit.
 */


struct ppp {
        int             magic;          /* magic value for structure    */
        struct ppp      *next;          /* unit with next index         */
        unsigned long   inuse;          /* are we allocated?            */
        int             line;           /* network interface unit #     */
        __u32           flags;          /* miscellaneous control flags  */
        int             mtu;            /* maximum xmit frame size      */
        int             mru;            /* maximum receive frame size   */
        struct slcompress *slcomp;      /* for TCP header compression   */
        struct sk_buff_head xmt_q;      /* frames to send from pppd     */
        struct sk_buff_head rcv_q;      /* frames for pppd to read      */
        unsigned long   xmit_busy;      /* bit 0 set when xmitter busy  */

        /* Information specific to using ppp on async serial lines. */
        struct tty_struct *tty;         /* ptr to TTY structure */
        struct tty_struct *backup_tty;  /* TTY to use if tty gets closed */
        __u8            escape;         /* 0x20 if prev char was PPP_ESC */
        __u8            toss;           /* toss this frame              */
        volatile __u8   tty_pushing;    /* internal state flag          */
        volatile __u8   woke_up;        /* internal state flag          */
        __u32           xmit_async_map[8]; /* 1 bit means that given control
                                           character is quoted on output*/

        __u32           recv_async_map; /* 1 bit means that given control
                                           character is ignored on input*/

        __u32           bytes_sent;     /* Bytes sent on frame  */
        __u32           bytes_rcvd;     /* Bytes recvd on frame */

        /* Async transmission information */
        struct sk_buff  *tpkt;          /* frame currently being sent   */
        int             tpkt_pos;       /* how much of it we've done    */
        __u16           tfcs;           /* FCS so far for it            */
        unsigned char   *optr;          /* where we're up to in sending */
        unsigned char   *olim;          /* points past last valid char  */

        /* Async reception information */
        struct sk_buff  *rpkt;          /* frame currently being rcvd   */
        __u16           rfcs;           /* FCS so far of rpkt           */

        /* Queues for select() functionality */
        wait_queue_head_t read_wait;    /* queue for reading processes  */

        /* info for detecting idle channels */
        unsigned long   last_xmit;      /* time of last transmission    */
        unsigned long   last_recv;      /* time last packet received    */

        /* Statistic information */
        struct pppstat  stats;          /* statistic information        */

        /* PPP compression protocol information */
        struct  compressor *sc_xcomp;   /* transmit compressor */
        void    *sc_xc_state;           /* transmit compressor state */
        struct  compressor *sc_rcomp;   /* receive decompressor */
        void    *sc_rc_state;           /* receive decompressor state */

        enum    NPmode sc_npmode[NUM_NP]; /* what to do with each NP */
        int      sc_xfer;               /* PID of reserved PPP table */
        char    name[16];               /* space for unit name */
        struct net_device       dev;            /* net device structure */
        struct net_device_stats estats; /* more detailed stats */

        /* tty output buffer */
        unsigned char   obuf[OBUFSIZE]; /* buffer for characters to send */
};

#define PPP_MAGIC       0x5002
#define PPP_VERSION     "2.3.7"