FreeBSD/Linux Kernel Cross Reference
sys/net/if_sppp.h

     /*
      * Defines for synchronous PPP/Cisco link level subroutines.
      *
      * Copyright (C) 1994 Cronyx Ltd.
      * Author: Serge Vakulenko, <vak@zebub.msk.su>
      *
      * This software is distributed with NO WARRANTIES, not even the implied
      * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
      *
     * Authors grant any other persons or organizations permission to use
     * or modify this software as long as this message is kept with the software,
     * all derivative works or modified versions.
     *
     * Version 1.7, Wed Jun  7 22:12:02 MSD 1995
     */
    
    #ifndef _NET_IF_HDLC_H_
    #define _NET_IF_HDLC_H_ 1
    
    struct slcp {
            u_short state;          /* state machine */
            u_long  magic;          /* local magic number */
            u_char  echoid;         /* id of last keepalive echo request */
            u_char  confid;         /* id of last configuration request */
    };
    
    struct sipcp {
            u_short state;          /* state machine */
            u_char  confid;         /* id of last configuration request */
    };
    
    struct sppp {
            struct  ifnet pp_if;    /* network interface data */
            struct  ifqueue pp_fastq; /* fast output queue */
            struct  sppp *pp_next;  /* next interface in keepalive list */
            u_int   pp_flags;       /* use Cisco protocol instead of PPP */
            u_short pp_alivecnt;    /* keepalive packets counter */
            u_short pp_loopcnt;     /* loopback detection counter */
            u_long  pp_seq;         /* local sequence number */
            u_long  pp_rseq;        /* remote sequence number */
            struct slcp lcp;        /* LCP params */
            struct sipcp ipcp;      /* IPCP params */
    };
    
    #define PP_KEEPALIVE    0x01    /* use keepalive protocol */
    #define PP_CISCO        0x02    /* use Cisco protocol instead of PPP */
    #define PP_TIMO         0x04    /* cp_timeout routine active */
    
    #define PP_MTU          1500    /* max. transmit unit */
    
    #define LCP_STATE_CLOSED        0       /* LCP state: closed (conf-req sent) */
    #define LCP_STATE_ACK_RCVD      1       /* LCP state: conf-ack received */
    #define LCP_STATE_ACK_SENT      2       /* LCP state: conf-ack sent */
    #define LCP_STATE_OPENED        3       /* LCP state: opened */
    
    #define IPCP_STATE_CLOSED       0       /* IPCP state: closed (conf-req sent) */
    #define IPCP_STATE_ACK_RCVD     1       /* IPCP state: conf-ack received */
    #define IPCP_STATE_ACK_SENT     2       /* IPCP state: conf-ack sent */
    #define IPCP_STATE_OPENED       3       /* IPCP state: opened */
    
    #ifdef KERNEL
    void sppp_attach (struct ifnet *ifp);
    void sppp_detach (struct ifnet *ifp);
    void sppp_input (struct ifnet *ifp, struct mbuf *m);
    int sppp_ioctl (struct ifnet *ifp, int cmd, void *data);
    struct mbuf *sppp_dequeue (struct ifnet *ifp);
    int sppp_isempty (struct ifnet *ifp);
    void sppp_flush (struct ifnet *ifp);
    #endif
    
    #endif /* _NET_IF_HDLC_H_ */

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