2 * Copyright (c) 1997 Joerg Wunsch. All rights reserved.
4 * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 *---------------------------------------------------------------------------
30 * i4b_isppp.c - isdn4bsd kernel SyncPPP driver
31 * --------------------------------------------
33 * Uses Serge Vakulenko's sppp backend (originally contributed with
34 * the "cx" driver for Cronyx's HDLC-in-hardware device). This driver
35 * is only the glue between sppp and i4b.
37 * $Id: i4b_isppp.c,v 1.44 2000/08/31 07:07:26 hm Exp $
39 * $FreeBSD: src/sys/i4b/driver/i4b_isppp.c,v 1.7.2.3 2003/02/06 14:50:53 gj Exp $
40 * $DragonFly: src/sys/net/i4b/driver/i4b_isppp.c,v 1.9 2004/04/01 07:27:17 joerg Exp $
42 * last edit-date: [Thu Aug 31 09:02:27 2000]
44 *---------------------------------------------------------------------------*/
49 #include "use_i4bisppp.h"
53 # error "You need to define `device sppp <N>' with options ISPPP"
57 #include <sys/param.h>
58 #include <sys/systm.h>
60 #include <sys/socket.h>
61 #include <sys/errno.h>
62 #include <sys/ioccom.h>
63 #include <sys/sockio.h>
64 #include <sys/kernel.h>
67 #include <net/if_arp.h>
68 #include <net/if_types.h>
69 #include <net/sppp/if_sppp.h>
72 #if defined(__DragonFly__) || (defined(__FreeBSD_version) && __FreeBSD_version >= 400008)
77 #if NBPFILTER > 0 || NBPF > 0
82 #if defined(__DragonFly__) || defined(__FreeBSD__)
83 #include <net/i4b/include/machine/i4b_debug.h>
84 #include <net/i4b/include/machine/i4b_ioctl.h>
86 #include <i4b/i4b_ioctl.h>
87 #include <i4b/i4b_cause.h>
88 #include <i4b/i4b_debug.h>
91 #include "../include/i4b_global.h"
92 #include "../include/i4b_l3l4.h"
93 #include "../layer4/i4b_l4.h"
95 #if defined(__DragonFly__) || defined(__FreeBSD__)
96 #define PDEVSTATIC static
99 #define ISPPP_FMT "%s: "
100 #define ISPPP_ARG(sc) ((sc)->sc_if.if_xname)
101 #define IFP2UNIT(ifp) ((struct i4bisppp_softc *)ifp->if_softc)->sc_unit
103 #define ISPPP_FMT "isp%d: "
104 #define ISPPP_ARG(sc) ((sc)->sc_if.if_unit)
105 #define IFP2UNIT(ifp) (ifp)->if_unit
108 # if defined(__DragonFly__) || __FreeBSD_version >= 300001
109 # define CALLOUT_INIT(chan) callout_handle_init(chan)
110 # define TIMEOUT(fun, arg, chan, tick) chan = timeout(fun, arg, tick)
111 # define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg, chan)
112 # define IOCTL_CMD_T u_long
114 # define CALLOUT_INIT(chan) do {} while(0)
115 # define TIMEOUT(fun, arg, chan, tick) timeout(fun, arg, tick)
116 # define UNTIMEOUT(fun, arg, chan) untimeout(fun, arg)
117 # define IOCTL_CMD_T int
120 #elif defined __NetBSD__ || defined __OpenBSD__
121 #define ISPPP_FMT "%s: "
122 #define ISPPP_ARG(sc) ((sc)->sc_if.if_xname)
123 #define PDEVSTATIC /* not static */
124 #define IOCTL_CMD_T u_long
125 #define IFP2UNIT(ifp) ((struct i4bisppp_softc *)ifp->if_softc)->sc_unit
127 # error "What system are you using?"
130 #if defined(__DragonFly__) || defined(__FreeBSD__)
131 PDEVSTATIC void i4bispppattach(void *);
132 PSEUDO_SET(i4bispppattach, i4b_isppp);
134 PDEVSTATIC void i4bispppattach(void);
137 #define I4BISPPPACCT 1 /* enable accounting messages */
138 #define I4BISPPPACCTINTVL 2 /* accounting msg interval in secs */
139 #define I4BISPPPDISCDEBUG 1
141 #define PPP_HDRLEN 4 /* 4 octetts PPP header length */
143 struct i4bisppp_softc {
145 * struct sppp starts with a struct ifnet, but we gotta allocate
146 * more space for it. NB: do not relocate this union, it must
147 * be first in isppp_softc. The tls and tlf hooks below want to
148 * convert a ``struct sppp *'' into a ``struct isppp_softc *''.
154 #define sc_if sc_if_un.scu_if
156 int sc_state; /* state of the interface */
158 #if !defined(__FreeBSD__) || defined(__DragonFly__)
159 int sc_unit; /* unit number for Net/OpenBSD */
162 call_desc_t *sc_cdp; /* ptr to call descriptor */
165 int sc_iinb; /* isdn driver # of inbytes */
166 int sc_ioutb; /* isdn driver # of outbytes */
167 int sc_inb; /* # of bytes rx'd */
168 int sc_outb; /* # of bytes tx'd */
169 int sc_linb; /* last # of bytes rx'd */
170 int sc_loutb; /* last # of bytes tx'd */
171 int sc_fn; /* flag, first null acct */
174 #if defined(__DragonFly__) || (defined(__FreeBSD_version) && __FreeBSD_version >= 300001)
175 struct callout_handle sc_ch;
178 } i4bisppp_softc[NI4BISPPP];
180 static void i4bisppp_init_linktab(int unit);
181 static int i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data,
185 static void i4bisppp_send(struct ifnet *ifp);
188 static void i4bisppp_start(struct ifnet *ifp);
190 #if 0 /* never used ??? */
191 static void i4bisppp_timeout(void *cookie);
194 static void i4bisppp_tls(struct sppp *sp);
195 static void i4bisppp_tlf(struct sppp *sp);
196 static void i4bisppp_state_changed(struct sppp *sp, int new_state);
197 static void i4bisppp_negotiation_complete(struct sppp *sp);
198 static void i4bisppp_watchdog(struct ifnet *ifp);
199 time_t i4bisppp_idletime(int unit);
201 /* initialized by L4 */
203 static drvr_link_t i4bisppp_drvr_linktab[NI4BISPPP];
204 static isdn_link_t *isdn_linktab[NI4BISPPP];
206 enum i4bisppp_states {
207 ST_IDLE, /* initialized, ready, idle */
208 ST_DIALING, /* dialling out to remote */
209 ST_CONNECTED, /* connected to remote */
212 /*===========================================================================*
213 * DEVICE DRIVER ROUTINES
214 *===========================================================================*/
216 /*---------------------------------------------------------------------------*
217 * interface attach routine at kernel boot time
218 *---------------------------------------------------------------------------*/
220 #if defined(__DragonFly__) || defined(__FreeBSD__)
221 i4bispppattach(void *dummy)
226 struct i4bisppp_softc *sc = i4bisppp_softc;
229 #ifndef HACK_NO_PSEUDO_ATTACH_MSG
231 printf("i4bisppp: %d ISDN SyncPPP device(s) attached (VJ header compression)\n", NI4BISPPP);
233 printf("i4bisppp: %d ISDN SyncPPP device(s) attached\n", NI4BISPPP);
237 for(i = 0; i < NI4BISPPP; sc++, i++) {
238 i4bisppp_init_linktab(i);
240 sc->sc_if.if_softc = sc;
243 if_initname(&(sc->sc_if), "isp", i);
244 #elif defined(__FreeBSD__)
245 sc->sc_if.if_name = "isp";
246 #if defined(__FreeBSD_version) && __FreeBSD_version < 300001
247 sc->sc_if.if_next = NULL;
249 sc->sc_if.if_unit = i;
251 sprintf(sc->sc_if.if_xname, "isp%d", i);
255 sc->sc_if.if_mtu = PP_MTU;
258 sc->sc_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT |
261 sc->sc_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT;
264 sc->sc_if.if_type = IFT_ISDNBASIC;
265 sc->sc_state = ST_IDLE;
267 sc->sc_if.if_ioctl = i4bisppp_ioctl;
269 /* actually initialized by sppp_attach() */
270 /* sc->sc_if.if_output = sppp_output; */
272 sc->sc_if.if_start = i4bisppp_start;
274 sc->sc_if.if_hdrlen = 0;
275 sc->sc_if.if_addrlen = 0;
276 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
278 sc->sc_if.if_ipackets = 0;
279 sc->sc_if.if_ierrors = 0;
280 sc->sc_if.if_opackets = 0;
281 sc->sc_if.if_oerrors = 0;
282 sc->sc_if.if_collisions = 0;
283 sc->sc_if.if_ibytes = 0;
284 sc->sc_if.if_obytes = 0;
285 sc->sc_if.if_imcasts = 0;
286 sc->sc_if.if_omcasts = 0;
287 sc->sc_if.if_iqdrops = 0;
288 sc->sc_if.if_noproto = 0;
291 sc->sc_if.if_timer = 0;
292 sc->sc_if.if_watchdog = i4bisppp_watchdog;
302 sc->sc_if_un.scu_sp.pp_tls = i4bisppp_tls;
303 sc->sc_if_un.scu_sp.pp_tlf = i4bisppp_tlf;
304 sc->sc_if_un.scu_sp.pp_con = i4bisppp_negotiation_complete;
305 sc->sc_if_un.scu_sp.pp_chg = i4bisppp_state_changed;
307 sppp_attach(&sc->sc_if);
308 /* XXX: validate / add proper code */
309 ether_ifattach_bpf(&sc->sc_if, ((struct arpcom*)sc)->ac_enaddr,
310 DLT_PPP, PPP_HDRLEN);
311 CALLOUT_INIT(&sc->sc_ch);
315 /*---------------------------------------------------------------------------*
317 *---------------------------------------------------------------------------*/
319 i4bisppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data,
322 struct i4bisppp_softc *sc = ifp->if_softc;
324 struct sppp *sp = (struct sppp *)sc;
325 struct ifaddr *ifa = (struct ifaddr *) data;
326 struct ifreq *ifr = (struct ifreq *) data;
331 error = sppp_ioctl(&sc->sc_if, cmd, data);
337 #if 0 /* never used ??? */
339 if ((ifp->if_flags & IFF_UP) == 0)
340 UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
349 /*---------------------------------------------------------------------------*
350 * start output to ISDN B-channel
351 *---------------------------------------------------------------------------*/
353 i4bisppp_start(struct ifnet *ifp)
355 struct i4bisppp_softc *sc = ifp->if_softc;
358 int unit = IFP2UNIT(ifp);
360 if (sppp_isempty(ifp))
363 if(sc->sc_state != ST_CONNECTED)
368 * ifp->if_flags |= IFF_OACTIVE; // - need to clear this somewhere
372 while ((m = sppp_dequeue(&sc->sc_if)) != NULL)
375 #if NBPFILTER > 0 || NBPF > 0
376 #if defined(__DragonFly__) || defined(__FreeBSD__)
379 #endif /* __FreeBSD__ */
383 bpf_mtap(ifp->if_bpf, m);
385 #endif /* NBPFILTER > 0 || NBPF > 0 */
387 microtime(&ifp->if_lastchange);
389 IF_LOCK(isdn_linktab[unit]->tx_queue);
390 if(_IF_QFULL(isdn_linktab[unit]->tx_queue))
392 NDBGL4(L4_ISPDBG, "isp%d, tx queue full!", unit);
398 sc->sc_if.if_obytes += m->m_pkthdr.len;
400 sc->sc_outb += m->m_pkthdr.len;
401 sc->sc_if.if_opackets++;
403 _IF_ENQUEUE(isdn_linktab[unit]->tx_queue, m);
405 IF_UNLOCK(isdn_linktab[unit]->tx_queue);
407 isdn_linktab[unit]->bch_tx_start(isdn_linktab[unit]->unit,
408 isdn_linktab[unit]->channel);
412 /*---------------------------------------------------------------------------*
414 *---------------------------------------------------------------------------*/
416 i4bisppp_watchdog(struct ifnet *ifp)
418 struct i4bisppp_softc *sc = ifp->if_softc;
419 int unit = IFP2UNIT(ifp);
420 bchan_statistics_t bs;
422 (*isdn_linktab[unit]->bch_stat)
423 (isdn_linktab[unit]->unit, isdn_linktab[unit]->channel, &bs);
425 sc->sc_ioutb += bs.outbytes;
426 sc->sc_iinb += bs.inbytes;
428 if((sc->sc_iinb != sc->sc_linb) || (sc->sc_ioutb != sc->sc_loutb) || sc->sc_fn)
430 int ri = (sc->sc_iinb - sc->sc_linb)/I4BISPPPACCTINTVL;
431 int ro = (sc->sc_ioutb - sc->sc_loutb)/I4BISPPPACCTINTVL;
433 if((sc->sc_iinb == sc->sc_linb) && (sc->sc_ioutb == sc->sc_loutb))
438 sc->sc_linb = sc->sc_iinb;
439 sc->sc_loutb = sc->sc_ioutb;
441 i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_DURING,
442 sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb);
444 sc->sc_if.if_timer = I4BISPPPACCTINTVL;
446 #if 0 /* old stuff, keep it around */
447 printf(ISPPP_FMT "transmit timeout\n", ISPPP_ARG(sc));
451 #endif /* I4BISPPPACCT */
454 *===========================================================================*
455 * SyncPPP layer interface routines
456 *===========================================================================*
459 #if 0 /* never used ??? */
460 /*---------------------------------------------------------------------------*
461 * just an alias for i4bisppp_tls, but of type timeout_t
462 *---------------------------------------------------------------------------*/
464 i4bisppp_timeout(void *cookie)
466 i4bisppp_tls((struct sppp *)cookie);
470 /*---------------------------------------------------------------------------*
471 * PPP this-layer-started action
472 *---------------------------------------------------------------------------*
475 i4bisppp_tls(struct sppp *sp)
477 struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
478 struct ifnet *ifp = (struct ifnet *)sp;
480 if(sc->sc_state == ST_CONNECTED)
483 i4b_l4_dialout(BDRV_ISPPP, IFP2UNIT(ifp));
486 /*---------------------------------------------------------------------------*
487 * PPP this-layer-finished action
488 *---------------------------------------------------------------------------*
491 i4bisppp_tlf(struct sppp *sp)
493 struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
494 /* call_desc_t *cd = sc->sc_cdp; */
495 struct ifnet *ifp = (struct ifnet *)sp;
497 if(sc->sc_state != ST_CONNECTED)
500 #if 0 /* never used ??? */
501 UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
504 i4b_l4_drvrdisc(BDRV_ISPPP, IFP2UNIT(ifp));
506 /*---------------------------------------------------------------------------*
507 * PPP interface phase change
508 *---------------------------------------------------------------------------*
511 i4bisppp_state_changed(struct sppp *sp, int new_state)
513 struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
515 i4b_l4_ifstate_changed(sc->sc_cdp, new_state);
518 /*---------------------------------------------------------------------------*
519 * PPP control protocol negotiation complete (run ip-up script now)
520 *---------------------------------------------------------------------------*
523 i4bisppp_negotiation_complete(struct sppp *sp)
525 struct i4bisppp_softc *sc = (struct i4bisppp_softc *)sp;
527 i4b_l4_negcomplete(sc->sc_cdp);
530 /*===========================================================================*
531 * ISDN INTERFACE ROUTINES
532 *===========================================================================*/
534 /*---------------------------------------------------------------------------*
535 * this routine is called from L4 handler at connect time
536 *---------------------------------------------------------------------------*/
538 i4bisppp_connect(int unit, void *cdp)
540 struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
541 struct sppp *sp = &sc->sc_if_un.scu_sp;
544 sc->sc_cdp = (call_desc_t *)cdp;
545 sc->sc_state = ST_CONNECTED;
554 sc->sc_if.if_timer = I4BISPPPACCTINTVL;
557 #if 0 /* never used ??? */
558 UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
561 sp->pp_up(sp); /* tell PPP we are ready */
563 sp->pp_last_sent = sp->pp_last_recv = SECOND;
568 /*---------------------------------------------------------------------------*
569 * this routine is called from L4 handler at disconnect time
570 *---------------------------------------------------------------------------*/
572 i4bisppp_disconnect(int unit, void *cdp)
574 call_desc_t *cd = (call_desc_t *)cdp;
575 struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
576 struct sppp *sp = &sc->sc_if_un.scu_sp;
580 /* new stuff to check that the active channel is being closed */
581 if (cd != sc->sc_cdp)
583 NDBGL4(L4_ISPDBG, "isp%d, channel%d not active!", unit, cd->channelid);
589 sc->sc_if.if_timer = 0;
592 i4b_l4_accounting(BDRV_ISPPP, unit, ACCT_FINAL,
593 sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb);
595 if (sc->sc_state == ST_CONNECTED)
597 #if 0 /* never used ??? */
598 UNTIMEOUT(i4bisppp_timeout, (void *)sp, sc->sc_ch);
600 sc->sc_cdp = (call_desc_t *)0;
601 /* do this here because pp_down calls i4bisppp_tlf */
602 sc->sc_state = ST_IDLE;
603 sp->pp_down(sp); /* tell PPP we have hung up */
609 /*---------------------------------------------------------------------------*
610 * this routine is used to give a feedback from userland demon
611 * in case of dial problems
612 *---------------------------------------------------------------------------*/
614 i4bisppp_dialresponse(int unit, int status, cause_t cause)
616 struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
617 struct sppp *sp = &sc->sc_if_un.scu_sp;
619 NDBGL4(L4_ISPDBG, "isp%d: status=%d, cause=%d", unit, status, cause);
621 if(status != DSTAT_NONE)
625 NDBGL4(L4_ISPDBG, "isp%d: clearing queues", unit);
627 if(!(sppp_isempty(&sc->sc_if)))
629 while((m = sppp_dequeue(&sc->sc_if)) != NULL)
633 sc->sc_cdp = (call_desc_t *)0;
634 /* do this here because pp_down calls i4bisppp_tlf */
635 sc->sc_state = ST_IDLE;
637 * Ahh, sppp doesn't like to get a down event when
638 * dialing fails. So first tell it that we are up
639 * (doesn't hurt us since sc_state != ST_CONNECTED)
647 /*---------------------------------------------------------------------------*
649 *---------------------------------------------------------------------------*/
651 i4bisppp_updown(int unit, int updown)
653 /* could probably do something useful here */
656 /*---------------------------------------------------------------------------*
657 * this routine is called from the HSCX interrupt handler
658 * when a new frame (mbuf) has been received and was put on
660 *---------------------------------------------------------------------------*/
662 i4bisppp_rx_data_rdy(int unit)
664 struct i4bisppp_softc *sc = &i4bisppp_softc[unit];
668 if((m = *isdn_linktab[unit]->rx_mbuf) == NULL)
671 m->m_pkthdr.rcvif = &sc->sc_if;
672 m->m_pkthdr.len = m->m_len;
674 microtime(&sc->sc_if.if_lastchange);
676 sc->sc_if.if_ipackets++;
678 sc->sc_if.if_ibytes += m->m_pkthdr.len;
682 sc->sc_inb += m->m_pkthdr.len;
686 printf("i4bisppp_rx_data_ready: received packet!\n");
689 #if NBPFILTER > 0 || NBPF > 0
691 #if defined(__DragonFly__) || defined(__FreeBSD__)
693 bpf_mtap(&sc->sc_if, m);
694 #endif /* __FreeBSD__ */
698 bpf_mtap(sc->sc_if.if_bpf, m);
701 #endif /* NBPFILTER > 0 || NBPF > 0 */
705 sppp_input(&sc->sc_if, m);
710 /*---------------------------------------------------------------------------*
711 * this routine is called from the HSCX interrupt handler
712 * when the last frame has been sent out and there is no
713 * further frame (mbuf) in the tx queue.
714 *---------------------------------------------------------------------------*/
716 i4bisppp_tx_queue_empty(int unit)
718 i4bisppp_start(&i4bisppp_softc[unit].sc_if);
721 /*---------------------------------------------------------------------------*
722 * THIS should be used instead of last_active_time to implement
723 * an activity timeout mechanism.
725 * Sending back the time difference unneccessarily complicates the
726 * idletime checks in i4b_l4.c. Return the largest time instead.
727 * That way the code in i4b_l4.c needs only minimal changes.
728 *---------------------------------------------------------------------------*/
730 i4bisppp_idletime(int unit)
733 return(i4bisppp_softc[unit].sc_cdp->last_active_time);
736 sp = (struct sppp *) &i4bisppp_softc[unit];
738 return((sp->pp_last_recv < sp->pp_last_sent) ?
739 sp->pp_last_sent : sp->pp_last_recv);
743 /*---------------------------------------------------------------------------*
744 * this routine is called from the HSCX interrupt handler
745 * each time a packet is received or transmitted. It should
746 * be used to implement an activity timeout mechanism.
747 *---------------------------------------------------------------------------*/
749 i4bisppp_activity(int unit, int rxtx)
751 i4bisppp_softc[unit].sc_cdp->last_active_time = SECOND;
754 /*---------------------------------------------------------------------------*
755 * return this drivers linktab address
756 *---------------------------------------------------------------------------*/
758 i4bisppp_ret_linktab(int unit)
760 return(&i4bisppp_drvr_linktab[unit]);
763 /*---------------------------------------------------------------------------*
764 * setup the isdn_linktab for this driver
765 *---------------------------------------------------------------------------*/
767 i4bisppp_set_linktab(int unit, isdn_link_t *ilt)
769 isdn_linktab[unit] = ilt;
772 /*---------------------------------------------------------------------------*
773 * initialize this drivers linktab
774 *---------------------------------------------------------------------------*/
776 i4bisppp_init_linktab(int unit)
778 i4bisppp_drvr_linktab[unit].unit = unit;
779 i4bisppp_drvr_linktab[unit].bch_rx_data_ready = i4bisppp_rx_data_rdy;
780 i4bisppp_drvr_linktab[unit].bch_tx_queue_empty = i4bisppp_tx_queue_empty;
781 i4bisppp_drvr_linktab[unit].bch_activity = i4bisppp_activity;
782 i4bisppp_drvr_linktab[unit].line_connected = i4bisppp_connect;
783 i4bisppp_drvr_linktab[unit].line_disconnected = i4bisppp_disconnect;
784 i4bisppp_drvr_linktab[unit].dial_response = i4bisppp_dialresponse;
785 i4bisppp_drvr_linktab[unit].updown_ind = i4bisppp_updown;
788 /*===========================================================================*/