/* * Copyright (c) 1997 Joerg Wunsch. All rights reserved. * * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *--------------------------------------------------------------------------- * * i4b_isppp.c - isdn4bsd kernel SyncPPP driver * -------------------------------------------- * * Uses Serge Vakulenko's sppp backend (originally contributed with * the "cx" driver for Cronyx's HDLC-in-hardware device). This driver * is only the glue between sppp and i4b. * * $Id: i4b_isppp.c,v 1.44 2000/08/31 07:07:26 hm Exp $ * * $FreeBSD$ * * last edit-date: [Thu Aug 31 09:02:27 2000] * *---------------------------------------------------------------------------*/ #ifndef __NetBSD__ #define USE_ISPPP #endif #include "i4bisppp.h" #ifndef USE_ISPPP #ifdef __FreeBSD__ #include "sppp.h" #endif #ifndef __NetBSD__ #if NI4BISPPP == 0 # error "You need to define `pseudo-device sppp ' with options ISPPP" #endif #endif #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(__FreeBSD__) || defined(__OpenBSD__) #ifndef USE_ISPPP #include #else #include #endif /* USE_ISPPP */ #else #include #endif #if defined(__FreeBSD_version) && __FreeBSD_version >= 400008 #include "bpf.h" #else #include "bpfilter.h" #endif #if NBPFILTER > 0 || NBPF > 0 #include #include #endif #ifdef __FreeBSD__ #include #include #else #include #include #include #endif #include #include #include #ifdef __FreeBSD__ #define ISPPP_FMT "isp%d: " #define ISPPP_ARG(sc) ((sc)->sc_if.if_unit) #define PDEVSTATIC static #define IFP2UNIT(ifp) (ifp)->if_unit # if __FreeBSD_version >= 300001 # define CALLOUT_INIT(chan) callout_handle_init(chan) # define TIMEOUT(fun, arg, chan, tick) chan = timeout(fun, arg, tick) # define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg, chan) # define IOCTL_CMD_T u_long # else # define CALLOUT_INIT(chan) do {} while(0) # define TIMEOUT(fun, arg, chan, tick) timeout(fun, arg, tick) # define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg) # define IOCTL_CMD_T int # endif #elif defined __NetBSD__ || defined __OpenBSD__ #define ISPPP_FMT "%s: " #define ISPPP_ARG(sc) ((sc)->sc_if.if_xname) #define PDEVSTATIC /* not static */ #define IOCTL_CMD_T u_long #define IFP2UNIT(ifp) ((struct i4bisppp_softc *)ifp->if_softc)->sc_unit #else # error "What system are you using?" #endif #ifdef __FreeBSD__ PDEVSTATIC void i4bispppattach(void *); PSEUDO_SET(i4bispppattach, i4b_isppp); #else PDEVSTATIC void i4bispppattach(void); #endif #define I4BISPPPACCT 1 /* enable accounting messages */ #define I4BISPPPACCTINTVL 2 /* accounting msg interval in secs */ #define I4BISPPPDISCDEBUG 1 #define PPP_HDRLEN 4 /* 4 octetts PPP header length */ struct i4bisppp_softc { /* * struct sppp starts with a struct ifnet, but we gotta allocate * more space for it. NB: do not relocate this union, it must * be first in isppp_softc. The tls and tlf hooks below want to * convert a ``struct sppp *'' into a ``struct isppp_softc *''. */ union { struct ifnet scu_if; struct sppp scu_sp; } sc_if_un; #define sc_if sc_if_un.scu_if int sc_state; /* state of the interface */ #ifndef __FreeBSD__ int sc_unit; /* unit number for Net/OpenBSD */ #endif call_desc_t *sc_cdp; /* ptr to call descriptor */ #ifdef I4BISPPPACCT int sc_iinb; /* isdn driver # of inbytes */ int sc_ioutb; /* isdn driver # of outbytes */ int sc_inb; /* # of bytes rx'd */ int sc_outb; /* # of bytes tx'd */ int sc_linb; /* last # of bytes rx'd */ int sc_loutb; /* last # of bytes tx'd */ int sc_fn; /* flag, first null acct */ #endif #if defined(__FreeBSD_version) && __FreeBSD_version >= 300001 struct callout_handle sc_ch; #endif } i4bisppp_softc[NI4BISPPP]; static void i4bisppp_init_linktab(int unit); static int i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data); #if 0 static void i4bisppp_send(struct ifnet *ifp); #endif static void i4bisppp_start(struct ifnet *ifp); #if 0 /* never used ??? */ static void i4bisppp_timeout(void *cookie); #endif static void i4bisppp_tls(struct sppp *sp); static void i4bisppp_tlf(struct sppp *sp); static void i4bisppp_state_changed(struct sppp *sp, int new_state); static void i4bisppp_negotiation_complete(struct sppp *sp); static void i4bisppp_watchdog(struct ifnet *ifp); time_t i4bisppp_idletime(int unit); /* initialized by L4 */ static drvr_link_t i4bisppp_drvr_linktab[NI4BISPPP]; static isdn_link_t *isdn_linktab[NI4BISPPP]; enum i4bisppp_states { ST_IDLE, /* initialized, ready, idle */ ST_DIALING, /* dialling out to remote */ ST_CONNECTED, /* connected to remote */ }; /*===========================================================================* * DEVICE DRIVER ROUTINES *===========================================================================*/ /*---------------------------------------------------------------------------* * interface attach routine at kernel boot time *---------------------------------------------------------------------------*/ PDEVSTATIC void #ifdef __FreeBSD__ i4bispppattach(void *dummy) #else i4bispppattach() #endif { struct i4bisppp_softc *sc = i4bisppp_softc; int i; #ifndef HACK_NO_PSEUDO_ATTACH_MSG #ifdef SPPP_VJ printf("i4bisppp: %d ISDN SyncPPP device(s) attached (VJ header compression)\n", NI4BISPPP); #else printf("i4bisppp: %d ISDN SyncPPP device(s) attached\n", NI4BISPPP); #endif #endif for(i = 0; i < NI4BISPPP; sc++, i++) { i4bisppp_init_linktab(i); sc->sc_if.if_softc = sc; #ifdef __FreeBSD__ sc->sc_if.if_name = "isp"; #if defined(__FreeBSD_version) && __FreeBSD_version < 300001 sc->sc_if.if_next = NULL; #endif sc->sc_if.if_unit = i; #else sprintf(sc->sc_if.if_xname, "isp%d", i); sc->sc_unit = i; #endif sc->sc_if.if_mtu = PP_MTU; #ifdef __NetBSD__ sc->sc_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; #else sc->sc_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT; #endif sc->sc_if.if_type = IFT_ISDNBASIC; sc->sc_state = ST_IDLE; sc->sc_if.if_ioctl = i4bisppp_ioctl; /* actually initialized by sppp_attach() */ /* sc->sc_if.if_output = sppp_output; */ sc->sc_if.if_start = i4bisppp_start; sc->sc_if.if_hdrlen = 0; sc->sc_if.if_addrlen = 0; sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; sc->sc_if.if_ipackets = 0; sc->sc_if.if_ierrors = 0; sc->sc_if.if_opackets = 0; sc->sc_if.if_oerrors = 0; sc->sc_if.if_collisions = 0; sc->sc_if.if_ibytes = 0; sc->sc_if.if_obytes = 0; sc->sc_if.if_imcasts = 0; sc->sc_if.if_omcasts = 0; sc->sc_if.if_iqdrops = 0; sc->sc_if.if_noproto = 0; #if I4BISPPPACCT sc->sc_if.if_timer = 0; sc->sc_if.if_watchdog = i4bisppp_watchdog; sc->sc_iinb = 0; sc->sc_ioutb = 0; sc->sc_inb = 0; sc->sc_outb = 0; sc->sc_linb = 0; sc->sc_loutb = 0; sc->sc_fn = 1; #endif sc->sc_if_un.scu_sp.pp_tls = i4bisppp_tls; sc->sc_if_un.scu_sp.pp_tlf = i4bisppp_tlf; sc->sc_if_un.scu_sp.pp_con = i4bisppp_negotiation_complete; sc->sc_if_un.scu_sp.pp_chg = i4bisppp_state_changed; #ifndef USE_ISPPP sppp_attach(&sc->sc_if); #else isppp_attach(&sc->sc_if); #endif #if defined(__FreeBSD_version) && ((__FreeBSD_version >= 500009) || (410000 <= __FreeBSD_version && __FreeBSD_version < 500000)) /* do not call bpfattach in ether_ifattach */ ether_ifattach(&sc->sc_if, 0); #else if_attach(&sc->sc_if); #endif #if NBPFILTER > 0 || NBPF > 0 #ifdef __FreeBSD__ bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN); CALLOUT_INIT(&sc->sc_ch); #endif /* __FreeBSD__ */ #ifdef __NetBSD__ bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_PPP, sizeof(u_int)); #endif #endif } } /*---------------------------------------------------------------------------* * process ioctl *---------------------------------------------------------------------------*/ static int i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data) { struct i4bisppp_softc *sc = ifp->if_softc; #if 0 struct sppp *sp = (struct sppp *)sc; struct ifaddr *ifa = (struct ifaddr *) data; struct ifreq *ifr = (struct ifreq *) data; #endif int error; #ifndef USE_ISPPP error = sppp_ioctl(&sc->sc_if, cmd, data); #else error = isppp_ioctl(&sc->sc_if, cmd, data); #endif if (error) return error; switch(cmd) { case SIOCSIFFLAGS: #if 0 /* never used ??? */ x = splimp(); if ((ifp->if_flags & IFF_UP) == 0) UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch); splx(x); #endif break; } return 0; } /*---------------------------------------------------------------------------* * start output to ISDN B-channel *---------------------------------------------------------------------------*/ static void i4bisppp_start(struct ifnet *ifp) { struct i4bisppp_softc *sc = ifp->if_softc; struct mbuf *m; /* int s; */ int unit = IFP2UNIT(ifp); #ifndef USE_ISPPP if (sppp_isempty(ifp)) #else if (isppp_isempty(ifp)) #endif return; if(sc->sc_state != ST_CONNECTED) return; /* * s = splimp(); * ifp->if_flags |= IFF_OACTIVE; // - need to clear this somewhere * splx(s); */ #ifndef USE_ISPPP while ((m = sppp_dequeue(&sc->sc_if)) != NULL) #else while ((m = isppp_dequeue(&sc->sc_if)) != NULL) #endif { #if NBPFILTER > 0 || NBPF > 0 #ifdef __FreeBSD__ if (ifp->if_bpf) bpf_mtap(ifp, m); #endif /* __FreeBSD__ */ #ifdef __NetBSD__ if (ifp->if_bpf) bpf_mtap(ifp->if_bpf, m); #endif #endif /* NBPFILTER > 0 || NBPF > 0 */ microtime(&ifp->if_lastchange); if(IF_QFULL(isdn_linktab[unit]->tx_queue)) { NDBGL4(L4_ISPDBG, "isp%d, tx queue full!", unit); m_freem(m); } else { IF_ENQUEUE(isdn_linktab[unit]->tx_queue, m); #if 0 sc->sc_if.if_obytes += m->m_pkthdr.len; #endif sc->sc_outb += m->m_pkthdr.len; sc->sc_if.if_opackets++; } } isdn_linktab[unit]->bch_tx_start(isdn_linktab[unit]->unit, isdn_linktab[unit]->channel); } #ifdef I4BISPPPACCT /*---------------------------------------------------------------------------* * watchdog routine *---------------------------------------------------------------------------*/ static void i4bisppp_watchdog(struct ifnet *ifp) { struct i4bisppp_softc *sc = ifp->if_softc; int unit = IFP2UNIT(ifp); bchan_statistics_t bs; (*isdn_linktab[unit]->bch_stat) (isdn_linktab[unit]->unit, isdn_linktab[unit]->channel, &bs); sc->sc_ioutb += bs.outbytes; sc->sc_iinb += bs.inbytes; if((sc->sc_iinb != sc->sc_linb) || (sc->sc_ioutb != sc->sc_loutb) || sc->sc_fn) { int ri = (sc->sc_iinb - sc->sc_linb)/I4BISPPPACCTINTVL; int ro = (sc->sc_ioutb - sc->sc_loutb)/I4BISPPPACCTINTVL; if((sc->sc_iinb == sc->sc_linb) && (sc->sc_ioutb == sc->sc_loutb)) sc->sc_fn = 0; else sc->sc_fn = 1; sc->sc_linb = sc->sc_iinb; sc->sc_loutb = sc->sc_ioutb; i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_DURING, sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb); } sc->sc_if.if_timer = I4BISPPPACCTINTVL; #if 0 /* old stuff, keep it around */ printf(ISPPP_FMT "transmit timeout\n", ISPPP_ARG(sc)); i4bisppp_start(ifp); #endif } #endif /* I4BISPPPACCT */ /* *===========================================================================* * SyncPPP layer interface routines *===========================================================================* */ #if 0 /* never used ??? */ /*---------------------------------------------------------------------------* * just an alias for i4bisppp_tls, but of type timeout_t *---------------------------------------------------------------------------*/ static void i4bisppp_timeout(void *cookie) { i4bisppp_tls((struct sppp *)cookie); } #endif /*---------------------------------------------------------------------------* * PPP this-layer-started action *---------------------------------------------------------------------------* */ static void i4bisppp_tls(struct sppp *sp) { struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp; struct ifnet *ifp = (struct ifnet *)sp; if(sc->sc_state == ST_CONNECTED) return; i4b_l4_dialout(BDRV_ISPPP, IFP2UNIT(ifp)); } /*---------------------------------------------------------------------------* * PPP this-layer-finished action *---------------------------------------------------------------------------* */ static void i4bisppp_tlf(struct sppp *sp) { struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp; /* call_desc_t *cd = sc->sc_cdp; */ struct ifnet *ifp = (struct ifnet *)sp; if(sc->sc_state != ST_CONNECTED) return; #if 0 /* never used ??? */ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch); #endif i4b_l4_drvrdisc(BDRV_ISPPP, IFP2UNIT(ifp)); } /*---------------------------------------------------------------------------* * PPP interface phase change *---------------------------------------------------------------------------* */ static void i4bisppp_state_changed(struct sppp *sp, int new_state) { struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp; i4b_l4_ifstate_changed(sc->sc_cdp, new_state); } /*---------------------------------------------------------------------------* * PPP control protocol negotiation complete (run ip-up script now) *---------------------------------------------------------------------------* */ static void i4bisppp_negotiation_complete(struct sppp *sp) { struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp; i4b_l4_negcomplete(sc->sc_cdp); } /*===========================================================================* * ISDN INTERFACE ROUTINES *===========================================================================*/ /*---------------------------------------------------------------------------* * this routine is called from L4 handler at connect time *---------------------------------------------------------------------------*/ static void i4bisppp_connect(int unit, void *cdp) { struct i4bisppp_softc *sc = &i4bisppp_softc[unit]; struct sppp *sp = &sc->sc_if_un.scu_sp; int s = splimp(); sc->sc_cdp = (call_desc_t *)cdp; sc->sc_state = ST_CONNECTED; #if I4BISPPPACCT sc->sc_iinb = 0; sc->sc_ioutb = 0; sc->sc_inb = 0; sc->sc_outb = 0; sc->sc_linb = 0; sc->sc_loutb = 0; sc->sc_if.if_timer = I4BISPPPACCTINTVL; #endif #if 0 /* never used ??? */ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch); #endif sp->pp_up(sp); /* tell PPP we are ready */ #ifndef __NetBSD__ sp->pp_last_sent = sp->pp_last_recv = SECOND; #endif splx(s); } /*---------------------------------------------------------------------------* * this routine is called from L4 handler at disconnect time *---------------------------------------------------------------------------*/ static void i4bisppp_disconnect(int unit, void *cdp) { call_desc_t *cd = (call_desc_t *)cdp; struct i4bisppp_softc *sc = &i4bisppp_softc[unit]; struct sppp *sp = &sc->sc_if_un.scu_sp; int s = splimp(); /* new stuff to check that the active channel is being closed */ if (cd != sc->sc_cdp) { NDBGL4(L4_ISPDBG, "isp%d, channel%d not active!", unit, cd->channelid); splx(s); return; } #if I4BISPPPACCT sc->sc_if.if_timer = 0; #endif i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_FINAL, sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb); if (sc->sc_state == ST_CONNECTED) { #if 0 /* never used ??? */ UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch); #endif sc->sc_cdp = (call_desc_t *)0; /* do thhis here because pp_down calls i4bisppp_tlf */ sc->sc_state = ST_IDLE; sp->pp_down(sp); /* tell PPP we have hung up */ } splx(s); } /*---------------------------------------------------------------------------* * this routine is used to give a feedback from userland demon * in case of dial problems *---------------------------------------------------------------------------*/ static void i4bisppp_dialresponse(int unit, int status, cause_t cause) { struct i4bisppp_softc *sc = &i4bisppp_softc[unit]; NDBGL4(L4_ISPDBG, "isp%d: status=%d, cause=%d", unit, status, cause); if(status != DSTAT_NONE) { struct mbuf *m; NDBGL4(L4_ISPDBG, "isp%d: clearing queues", unit); #ifndef USE_ISPPP if(!(sppp_isempty(&sc->sc_if))) #else if(!(isppp_isempty(&sc->sc_if))) #endif { #ifndef USE_ISPPP while((m = sppp_dequeue(&sc->sc_if)) != NULL) #else while((m = isppp_dequeue(&sc->sc_if)) != NULL) #endif m_freem(m); } } } /*---------------------------------------------------------------------------* * interface up/down *---------------------------------------------------------------------------*/ static void i4bisppp_updown(int unit, int updown) { /* could probably do something useful here */ } /*---------------------------------------------------------------------------* * this routine is called from the HSCX interrupt handler * when a new frame (mbuf) has been received and was put on * the rx queue. *---------------------------------------------------------------------------*/ static void i4bisppp_rx_data_rdy(int unit) { struct i4bisppp_softc *sc = &i4bisppp_softc[unit]; struct mbuf *m; int s; if((m = *isdn_linktab[unit]->rx_mbuf) == NULL) return; m->m_pkthdr.rcvif = &sc->sc_if; m->m_pkthdr.len = m->m_len; microtime(&sc->sc_if.if_lastchange); sc->sc_if.if_ipackets++; #if 0 sc->sc_if.if_ibytes += m->m_pkthdr.len; #endif #if I4BISPPPACCT sc->sc_inb += m->m_pkthdr.len; #endif #ifdef I4BISPPPDEBUG printf("i4bisppp_rx_data_ready: received packet!\n"); #endif #if NBPFILTER > 0 || NBPF > 0 #ifdef __FreeBSD__ if(sc->sc_if.if_bpf) bpf_mtap(&sc->sc_if, m); #endif /* __FreeBSD__ */ #ifdef __NetBSD__ if(sc->sc_if.if_bpf) bpf_mtap(sc->sc_if.if_bpf, m); #endif #endif /* NBPFILTER > 0 || NBPF > 0 */ s = splimp(); #ifndef USE_ISPPP sppp_input(&sc->sc_if, m); #else isppp_input(&sc->sc_if, m); #endif splx(s); } /*---------------------------------------------------------------------------* * this routine is called from the HSCX interrupt handler * when the last frame has been sent out and there is no * further frame (mbuf) in the tx queue. *---------------------------------------------------------------------------*/ static void i4bisppp_tx_queue_empty(int unit) { i4bisppp_start(&i4bisppp_softc[unit].sc_if); } /*---------------------------------------------------------------------------* * THIS should be used instead of last_active_time to implement * an activity timeout mechanism. * * Sending back the time difference unneccessarily complicates the * idletime checks in i4b_l4.c. Return the largest time instead. * That way the code in i4b_l4.c needs only minimal changes. *---------------------------------------------------------------------------*/ time_t i4bisppp_idletime(int unit) { #ifdef __NetBSD__ return(i4bisppp_softc[unit].sc_cdp->last_active_time); #else struct sppp *sp; sp = (struct sppp *) &i4bisppp_softc[unit]; return((sp->pp_last_recv < sp->pp_last_sent) ? sp->pp_last_sent : sp->pp_last_recv); #endif } /*---------------------------------------------------------------------------* * this routine is called from the HSCX interrupt handler * each time a packet is received or transmitted. It should * be used to implement an activity timeout mechanism. *---------------------------------------------------------------------------*/ static void i4bisppp_activity(int unit, int rxtx) { i4bisppp_softc[unit].sc_cdp->last_active_time = SECOND; } /*---------------------------------------------------------------------------* * return this drivers linktab address *---------------------------------------------------------------------------*/ drvr_link_t * i4bisppp_ret_linktab(int unit) { return(&i4bisppp_drvr_linktab[unit]); } /*---------------------------------------------------------------------------* * setup the isdn_linktab for this driver *---------------------------------------------------------------------------*/ void i4bisppp_set_linktab(int unit, isdn_link_t *ilt) { isdn_linktab[unit] = ilt; } /*---------------------------------------------------------------------------* * initialize this drivers linktab *---------------------------------------------------------------------------*/ static void i4bisppp_init_linktab(int unit) { i4bisppp_drvr_linktab[unit].unit = unit; i4bisppp_drvr_linktab[unit].bch_rx_data_ready = i4bisppp_rx_data_rdy; i4bisppp_drvr_linktab[unit].bch_tx_queue_empty = i4bisppp_tx_queue_empty; i4bisppp_drvr_linktab[unit].bch_activity = i4bisppp_activity; i4bisppp_drvr_linktab[unit].line_connected = i4bisppp_connect; i4bisppp_drvr_linktab[unit].line_disconnected = i4bisppp_disconnect; i4bisppp_drvr_linktab[unit].dial_response = i4bisppp_dialresponse; i4bisppp_drvr_linktab[unit].updown_ind = i4bisppp_updown; } /*===========================================================================*/