summaryrefslogtreecommitdiffstats
path: root/sys/i4b/driver/i4b_ipr.c
blob: 0d90b8a3d5e6ca204d798bac11f09e96d5796228 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
/*-
 * Copyright (c) 1997, 2002 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_ipr.c - isdn4bsd IP over raw HDLC ISDN network driver
 *	---------------------------------------------------------
 *	last edit-date: [Sun Mar 17 09:32:58 2002]
 *
 *---------------------------------------------------------------------------*
 *
 *	statistics counter usage (interface lifetime):
 *	----------------------------------------------
 *	sc->sc_ifp->if_ipackets	# of received packets
 *	sc->sc_ifp->if_ierrors	# of error packets not going to upper layers
 *	sc->sc_ifp->if_opackets	# of transmitted packets
 *	sc->sc_ifp->if_oerrors	# of error packets not being transmitted
 *	sc->sc_ifp->if_collisions	# of invalid ip packets after VJ decompression
 *	sc->sc_ifp->if_ibytes	# of bytes coming in from the line (before VJ)
 *	sc->sc_ifp->if_obytes	# of bytes going out to the line (after VJ)
 *	sc->sc_ifp->if_imcasts	  (currently unused)
 *	sc->sc_ifp->if_omcasts	# of frames sent out of the fastqueue
 *	sc->sc_ifp->if_iqdrops	# of frames dropped on input because queue full
 *	sc->sc_ifp->if_noproto	# of frames dropped on output because !AF_INET
 *
 *	statistics counter usage (connection lifetime):
 *	-----------------------------------------------
 *	sc->sc_iinb		# of ISDN incoming bytes from HSCX
 *	sc->sc_ioutb		# of ISDN outgoing bytes from HSCX
 *	sc->sc_inb		# of incoming bytes after decompression
 *	sc->sc_outb		# of outgoing bytes before compression
 *
 *---------------------------------------------------------------------------*/ 

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_i4b.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/ioccom.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>

#ifdef IPR_VJ
#include <sys/malloc.h>
#include <net/slcompress.h>       
#define IPR_COMPRESS IFF_LINK0  /* compress TCP traffic */
#define IPR_AUTOCOMP IFF_LINK1  /* auto-enable TCP compression */

/*---------------------------------------------------------------------------
 * NOTICE: using NO separate buffer relies on the assumption, that the HSCX
 * IRQ handler _always_ allocates a single, continuous mbuf cluster large
 * enough to hold the maximum MTU size if the ipr interface !
 *
 * CAUTION: i have re-defined IPR_VJ_USEBUFFER because it makes problems
 *          with 2 i4b's back to back running cvs over ssh, cvs simply
 *          aborts because it gets bad data. Everything else (telnet/ftp?etc)
 *          functions fine. 
 *---------------------------------------------------------------------------*/
#define IPR_VJ_USEBUFFER	/* define to use an allocated separate buffer*/
				/* undef to uncompress in the mbuf itself    */
#endif /* IPR_VJ */

#include <sys/time.h>
#include <net/bpf.h>

#include <machine/i4b_ioctl.h>
#include <machine/i4b_debug.h>

#include <i4b/include/i4b_global.h>
#include <i4b/include/i4b_l3l4.h>

#include <i4b/layer4/i4b_l4.h>

NET_NEEDS_GIANT("i4b_ipr");

#define I4BIPRMTU	1500		/* regular MTU */
#define I4BIPRMAXMTU	2000		/* max MTU */
#define I4BIPRMINMTU	500		/* min MTU */

#define I4BIPRMAXQLEN	50		/* max queue length */

#define I4BIPRACCT	1		/* enable accounting messages */
#define	I4BIPRACCTINTVL	2		/* accounting msg interval in secs */
#define I4BIPRADJFRXP	1		/* adjust 1st rxd packet */

/* initialized by L4 */

static drvr_link_t ipr_drvr_linktab[NI4BIPR];
static isdn_link_t *isdn_linktab[NI4BIPR];

struct ipr_softc {
	struct ifnet	*sc_ifp;	/* network-visible interface	*/
	int		sc_state;	/* state of the interface	*/
	call_desc_t	*sc_cdp;	/* ptr to call descriptor	*/
	int		sc_updown;	/* soft state of interface	*/
	struct ifqueue  sc_fastq;	/* interactive traffic		*/
	int		sc_dialresp;	/* dialresponse			*/
	int		sc_lastdialresp;/* last dialresponse		*/
	struct callout_handle	sc_callout;
	
#if I4BIPRACCT
	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	

#ifdef I4BIPRADJFRXP
	int		sc_first_pkt;	/* flag, first rxd packet	*/
#endif

#if IPR_LOG
	int		sc_log_first;	/* log first n packets          */
#endif

#ifdef IPR_VJ
	struct slcompress sc_compr;	/* tcp compression data		*/
#ifdef IPR_VJ_USEBUFFER
	u_char		*sc_cbuf;	/* tcp decompression buffer	*/
#endif
#endif

} ipr_softc[NI4BIPR];

enum ipr_states {
	ST_IDLE,			/* initialized, ready, idle	*/
	ST_DIALING,			/* dialling out to remote	*/
	ST_CONNECTED_W,			/* connected to remote		*/
	ST_CONNECTED_A,			/* connected to remote		*/
};

static void i4biprattach(void *);
PSEUDO_SET(i4biprattach, i4b_ipr);
static int i4biprioctl(struct ifnet *ifp, u_long cmd, caddr_t data);

static void iprwatchdog(struct ifnet *ifp);
static void ipr_init_linktab(int unit);
static void ipr_tx_queue_empty(int unit);
static int i4biproutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rtp);
static void iprclearqueues(struct ipr_softc *sc);

/*===========================================================================*
 *			DEVICE DRIVER ROUTINES
 *===========================================================================*/

/*---------------------------------------------------------------------------*
 *	interface attach routine at kernel boot time
 *---------------------------------------------------------------------------*/
static void
i4biprattach(void *dummy)
{
	struct ipr_softc *sc = ipr_softc;
	int i;

#ifdef IPR_VJ
	printf("i4bipr: %d IP over raw HDLC ISDN device(s) attached (VJ header compression)\n", NI4BIPR);
#else
	printf("i4bipr: %d IP over raw HDLC ISDN device(s) attached\n", NI4BIPR);
#endif
	
	for(i=0; i < NI4BIPR; sc++, i++)
	{
		ipr_init_linktab(i);

		NDBGL4(L4_DIALST, "setting dial state to ST_IDLE");

		sc->sc_ifp = if_alloc(IFT_ISDNBASIC);
		if (sc->sc_ifp == NULL)
			panic("i4b_ipr.c, i4biprattach: cannot if_alloc()");

		sc->sc_ifp->if_softc = sc;
		sc->sc_state = ST_IDLE;
		if_initname(sc->sc_ifp, "ipr", i);


#ifdef	IPR_VJ
		sc->sc_ifp->if_flags = IFF_POINTOPOINT | IFF_SIMPLEX | IPR_AUTOCOMP;
#else
		sc->sc_ifp->if_flags = IFF_POINTOPOINT | IFF_SIMPLEX;
#endif

		sc->sc_ifp->if_mtu = I4BIPRMTU;
		sc->sc_ifp->if_ioctl = i4biprioctl;
		sc->sc_ifp->if_output = i4biproutput;

		sc->sc_ifp->if_snd.ifq_maxlen = I4BIPRMAXQLEN;
		sc->sc_fastq.ifq_maxlen = I4BIPRMAXQLEN;

		if(!mtx_initialized(&sc->sc_fastq.ifq_mtx))
			mtx_init(&sc->sc_fastq.ifq_mtx, "i4b_ipr_fastq", NULL, MTX_DEF);

		sc->sc_ifp->if_ipackets = 0;
		sc->sc_ifp->if_ierrors = 0;
		sc->sc_ifp->if_opackets = 0;
		sc->sc_ifp->if_oerrors = 0;
		sc->sc_ifp->if_collisions = 0;
		sc->sc_ifp->if_ibytes = 0;
		sc->sc_ifp->if_obytes = 0;
		sc->sc_ifp->if_imcasts = 0;
		sc->sc_ifp->if_omcasts = 0;
		sc->sc_ifp->if_iqdrops = 0;
		sc->sc_ifp->if_noproto = 0;

#if I4BIPRACCT
		sc->sc_ifp->if_timer = 0;	
		sc->sc_ifp->if_watchdog = iprwatchdog;	
		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

#if IPR_LOG
		sc->sc_log_first = IPR_LOG;
#endif

#ifdef IPR_VJ
		sl_compress_init(&sc->sc_compr, -1);

#ifdef IPR_VJ_USEBUFFER
		if(!((sc->sc_cbuf =
		   (u_char *)malloc(I4BIPRMAXMTU+128, M_DEVBUF, M_WAITOK))))
		{
			panic("i4b_ipr.c, i4biprattach: VJ malloc failed");
		}
#endif
#endif
		sc->sc_updown = SOFT_ENA;	/* soft enabled */
		sc->sc_dialresp = DSTAT_NONE;	/* no response */
		sc->sc_lastdialresp = DSTAT_NONE;
		
		if_attach(sc->sc_ifp);

		bpfattach(sc->sc_ifp, DLT_NULL, sizeof(u_int32_t));
	}
}

/*---------------------------------------------------------------------------*
 *	output a packet to the ISDN B-channel
 *---------------------------------------------------------------------------*/
static int
i4biproutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
	 struct rtentry *rtp)
{
	struct ipr_softc *sc;
	int unit;
	int s;
	struct ifqueue *ifq;
	struct ip *ip;
	u_int32_t af;
	
	s = SPLI4B();

	sc = ifp->if_softc;
	unit = ifp->if_dunit;

	/* BPF writes need to be handled specially. */
	if(dst->sa_family == AF_UNSPEC)
	{
		bcopy(dst->sa_data, &af, sizeof(af));
		dst->sa_family = af;
	}

	/* check for IP */
	
	if(dst->sa_family != AF_INET)
	{
		if_printf(ifp, "af%d not supported\n", dst->sa_family);
		m_freem(m);
		splx(s);
		sc->sc_ifp->if_noproto++;
		sc->sc_ifp->if_oerrors++;
		return(EAFNOSUPPORT);
	}

	/* check interface state = UP */
	
	if(!(ifp->if_flags & IFF_UP))
	{
		NDBGL4(L4_IPRDBG, "ipr%d: interface is DOWN!", unit);
		m_freem(m);
		splx(s);
		sc->sc_ifp->if_oerrors++;
		return(ENETDOWN);
	}

	/* dial if necessary */
	
	if(sc->sc_state == ST_IDLE || sc->sc_state == ST_DIALING)
	{

#ifdef NOTDEF
		switch(sc->sc_dialresp)
		{
			case DSTAT_TFAIL:	/* transient failure */
				NDBGL4(L4_IPRDBG, "ipr%d: transient dial failure!", unit);
				m_freem(m);
				iprclearqueues(sc);
				sc->sc_dialresp = DSTAT_NONE;
				splx(s);
				sc->sc_ifp->if_oerrors++;
				return(ENETUNREACH);
				break;

			case DSTAT_PFAIL:	/* permanent failure */
				NDBGL4(L4_IPRDBG, "ipr%d: permanent dial failure!", unit);
				m_freem(m);
				iprclearqueues(sc);
				sc->sc_dialresp = DSTAT_NONE;
				splx(s);
				sc->sc_ifp->if_oerrors++;
				return(EHOSTUNREACH);				
				break;

			case DSTAT_INONLY:	/* no dialout allowed*/
				NDBGL4(L4_IPRDBG, "ipr%d: dialout not allowed failure!", unit);
				m_freem(m);
				iprclearqueues(sc);
				sc->sc_dialresp = DSTAT_NONE;
				splx(s);
				sc->sc_ifp->if_oerrors++;
				return(EHOSTUNREACH);				
				break;
		}
#endif

		NDBGL4(L4_IPRDBG, "ipr%d: send dial request message!", unit);
		NDBGL4(L4_DIALST, "ipr%d: setting dial state to ST_DIALING", unit);
		i4b_l4_dialout(BDRV_IPR, unit);
		sc->sc_state = ST_DIALING;
	}

#if IPR_LOG
	if(sc->sc_log_first > 0)
	{
		--(sc->sc_log_first);
		i4b_l4_packet_ind(BDRV_IPR, unit, 1, m );
	}
#endif

	/* update access time */
	
	microtime(&sc->sc_ifp->if_lastchange);

	/*
	 * check, if type of service indicates interactive, i.e. telnet,
	 * traffic. in case it is interactive, put it into the fast queue,
	 * else (i.e. ftp traffic) put it into the "normal" queue
	 */

	ip = mtod(m, struct ip *);		/* get ptr to ip header */
	 
	if(ip->ip_tos & IPTOS_LOWDELAY)
		ifq = &sc->sc_fastq;
	else
	        ifq = (struct ifqueue *)&sc->sc_ifp->if_snd;

	/* check for space in choosen send queue */
	
	if(! IF_HANDOFF(ifq, m, NULL))
	{
		NDBGL4(L4_IPRDBG, "ipr%d: send queue full!", unit);
		splx(s);
		sc->sc_ifp->if_oerrors++;
		return(ENOBUFS);
	}
	
	NDBGL4(L4_IPRDBG, "ipr%d: add packet to send queue!", unit);
	
	ipr_tx_queue_empty(unit);

	splx(s);

	return (0);
}

/*---------------------------------------------------------------------------*
 *	process ioctl
 *---------------------------------------------------------------------------*/
static int
i4biprioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
	struct ipr_softc *sc = ifp->if_softc;
	struct ifreq *ifr = (struct ifreq *)data;
	struct ifaddr *ifa = (struct ifaddr *)data;
	int s;
	int error = 0;

	s = SPLI4B();
	
	switch (cmd)
	{
		case SIOCAIFADDR:	/* add interface address */
		case SIOCSIFADDR:	/* set interface address */
		case SIOCSIFDSTADDR:	/* set interface destination address */
			if(ifa->ifa_addr->sa_family != AF_INET)
				error = EAFNOSUPPORT;
			else
				sc->sc_ifp->if_flags |= IFF_UP;
			microtime(&sc->sc_ifp->if_lastchange);
			break;

		case SIOCSIFFLAGS:	/* set interface flags */
			if(!(ifr->ifr_flags & IFF_UP))
			{
				if(sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
				{
					/* disconnect ISDN line */
					i4b_l4_drvrdisc(BDRV_IPR,
					    ifp->if_dunit);
					sc->sc_ifp->if_drv_flags &=
					    ~IFF_DRV_RUNNING;
				}

				sc->sc_state = ST_IDLE;

				/* empty queues */

				iprclearqueues(sc);
			}

			if(ifr->ifr_flags & IFF_DEBUG)
			{
				/* enable debug messages */
			}
			
			microtime(&sc->sc_ifp->if_lastchange);
			break;

		case SIOCSIFMTU:	/* set interface MTU */
			if(ifr->ifr_mtu > I4BIPRMAXMTU)
				error = EINVAL;
			else if(ifr->ifr_mtu < I4BIPRMINMTU)
				error = EINVAL;
			else
			{
				ifp->if_mtu = ifr->ifr_mtu;
				microtime(&sc->sc_ifp->if_lastchange);
			}
			break;
#if 0
	/* not needed for FreeBSD, done in sl_compress_init() (-hm) */
	
			/* need to add an ioctl:	set VJ max slot ID
			 * #define IPRIOCSMAXCID	_IOW('I', XXX, int)
			 */
#ifdef IPR_VJ
		case IPRIOCSMAXCID:
			{
			struct thread *td = curthread;	/* XXX */

			if((error = priv_check(td, PRIV_DRIVER)))
				return (error);
		        sl_compress_setup(sc->sc_compr, *(int *)data);
			}
			break;
#endif
#endif /* #if 0 */

		default:
			error = EINVAL;
			break;
	}
	splx(s);
	return(error);
}

/*---------------------------------------------------------------------------*
 *	clear the interface's send queues
 *---------------------------------------------------------------------------*/
static void
iprclearqueues(struct ipr_softc *sc)
{
	int x;

	x = splimp();
	IF_DRAIN(&sc->sc_fastq);
	IF_DRAIN(&sc->sc_ifp->if_snd);
	splx(x);
}
        
#if I4BIPRACCT
/*---------------------------------------------------------------------------*
 *	watchdog routine
 *---------------------------------------------------------------------------*/
static void
iprwatchdog(struct ifnet *ifp)
{
	int unit = ifp->if_dunit;
	struct ipr_softc *sc = ifp->if_softc;
	bchan_statistics_t bs;
	
	/* get # of bytes in and out from the HSCX driver */ 
	
	(*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)/I4BIPRACCTINTVL;
		int ro = (sc->sc_ioutb - sc->sc_loutb)/I4BIPRACCTINTVL;

		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_IPR, unit, ACCT_DURING,
			 sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb);
 	}
	sc->sc_ifp->if_timer = I4BIPRACCTINTVL; 	
}
#endif /* I4BIPRACCT */

/*===========================================================================*
 *			ISDN INTERFACE ROUTINES
 *===========================================================================*/

/*---------------------------------------------------------------------------*
 *	start transmitting after connect
 *---------------------------------------------------------------------------*/
static void
i4bipr_connect_startio(struct ipr_softc *sc)
{
	int s = SPLI4B();
	
	if(sc->sc_state == ST_CONNECTED_W)
	{
		sc->sc_state = ST_CONNECTED_A;
		ipr_tx_queue_empty(sc->sc_ifp->if_dunit);
	}

	splx(s);
}
 
/*---------------------------------------------------------------------------*
 *	this routine is called from L4 handler at connect time
 *---------------------------------------------------------------------------*/
static void
ipr_connect(int unit, void *cdp)
{
	struct ipr_softc *sc = &ipr_softc[unit];
	int s;

	sc->sc_cdp = (call_desc_t *)cdp;

	s = SPLI4B();

	NDBGL4(L4_DIALST, "ipr%d: setting dial state to ST_CONNECTED", unit);

	sc->sc_ifp->if_drv_flags |= IFF_DRV_RUNNING;
	sc->sc_state = ST_CONNECTED_W;

	sc->sc_dialresp = DSTAT_NONE;
	sc->sc_lastdialresp = DSTAT_NONE;	
	
#if I4BIPRACCT
	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_ifp->if_timer = I4BIPRACCTINTVL;
#endif

#ifdef I4BIPRADJFRXP
	sc->sc_first_pkt = 1;
#endif

	/*
	 * Sometimes ISDN B-channels are switched thru asymmetic. This
	 * means that under such circumstances B-channel data (the first
	 * three packets of a TCP connection in my case) may get lost,
	 * causing a large delay until the connection is started.
	 * When the sending of the very first packet of a TCP connection
	 * is delayed for a to be empirically determined delay (close
	 * to a second in my case) those packets go thru and the TCP
	 * connection comes up "almost" immediately (-hm).
	 */

	if(sc->sc_cdp->isdntxdelay > 0)
	{
		int delay;

		if (hz == 100) {
			delay = sc->sc_cdp->isdntxdelay;	/* avoid any rounding */
		} else {
			delay = sc->sc_cdp->isdntxdelay*hz;
			delay /= 100;
		}

		START_TIMER(sc->sc_callout, (TIMEOUT_FUNC_T)i4bipr_connect_startio, (void *)sc,  delay);
	}
	else
	{
		sc->sc_state = ST_CONNECTED_A;
		ipr_tx_queue_empty(unit);
	}

	splx(s);

	/* we don't need any negotiation - pass event back right now */
	i4b_l4_negcomplete(sc->sc_cdp);
}
	
/*---------------------------------------------------------------------------*
 *	this routine is called from L4 handler at disconnect time
 *---------------------------------------------------------------------------*/
static void
ipr_disconnect(int unit, void *cdp)
{
	call_desc_t *cd = (call_desc_t *)cdp;
	struct ipr_softc *sc = &ipr_softc[unit];

	/* new stuff to check that the active channel is being closed */

	if (cd != sc->sc_cdp)
	{
		NDBGL4(L4_IPRDBG, "ipr%d: channel %d not active",
				cd->driver_unit, cd->channelid);
		return;
	}

#if I4BIPRACCT
	sc->sc_ifp->if_timer = 0;
#endif

#if IPR_LOG
	/* show next IPR_LOG packets again */
	sc->sc_log_first = IPR_LOG;
#endif

	i4b_l4_accounting(BDRV_IPR, cd->driver_unit, ACCT_FINAL,
		 sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb);
	
	sc->sc_cdp = (call_desc_t *)0;	

	NDBGL4(L4_DIALST, "setting dial state to ST_IDLE");

	sc->sc_dialresp = DSTAT_NONE;
	sc->sc_lastdialresp = DSTAT_NONE;	

	sc->sc_ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
	sc->sc_state = ST_IDLE;
}

/*---------------------------------------------------------------------------*
 *	this routine is used to give a feedback from userland daemon
 *	in case of dial problems
 *---------------------------------------------------------------------------*/
static void
ipr_dialresponse(int unit, int status, cause_t cause)
{
	struct ipr_softc *sc = &ipr_softc[unit];
	sc->sc_dialresp = status;

	NDBGL4(L4_IPRDBG, "ipr%d: last=%d, this=%d",
		unit, sc->sc_lastdialresp, sc->sc_dialresp);

	if(status != DSTAT_NONE)
	{
		NDBGL4(L4_IPRDBG, "ipr%d: clearing queues", unit);
		iprclearqueues(sc);
	}
}
	
/*---------------------------------------------------------------------------*
 *	interface soft up/down
 *---------------------------------------------------------------------------*/
static void
ipr_updown(int unit, int updown)
{
	struct ipr_softc *sc = &ipr_softc[unit];
	sc->sc_updown = updown;
}
	
/*---------------------------------------------------------------------------*
 *	this routine is called from the HSCX interrupt handler
 *	when a new frame (mbuf) has been received and was put on
 *	the rx queue. It is assumed that this routines runs at
 *	pri level splimp() ! Keep it short !
 *---------------------------------------------------------------------------*/
static void
ipr_rx_data_rdy(int unit)
{
	register struct ipr_softc *sc = &ipr_softc[unit];
	register struct mbuf *m;

#ifdef IPR_VJ
#ifdef IPR_VJ_USEBUFFER
	u_char *cp = sc->sc_cbuf;
#endif	
	int len, c;
#endif
	
	if((m = *isdn_linktab[unit]->rx_mbuf) == NULL)
		return;

	m->m_pkthdr.rcvif = sc->sc_ifp;

	m->m_pkthdr.len = m->m_len;

	microtime(&sc->sc_ifp->if_lastchange);

#ifdef I4BIPRADJFRXP

	/*
	 * The very first packet after the B channel is switched thru
	 * has very often several bytes of random data prepended. This
	 * routine looks where the IP header starts and removes the
	 * the bad data.
	 */

	if(sc->sc_first_pkt)
	{
		unsigned char *mp = m->m_data;
		int i;
		
		sc->sc_first_pkt = 0;

		for(i = 0; i < m->m_len; i++, mp++)
		{
			if( ((*mp & 0xf0) == 0x40) &&
			    ((*mp & 0x0f) >= 0x05) )
			{
				m->m_data = mp;
				m->m_pkthdr.len -= i;				
				break;
			}
		}
	}
#endif
		
	sc->sc_ifp->if_ipackets++;
	sc->sc_ifp->if_ibytes += m->m_pkthdr.len;

#ifdef	IPR_VJ
	if((c = (*(mtod(m, u_char *)) & 0xf0)) != (IPVERSION << 4))
	{
		/* copy data to buffer */

		len = m->m_len;

#ifdef IPR_VJ_USEBUFFER
/* XXX */	m_copydata(m, 0, len, cp);
#endif
		
		if(c & 0x80)
		{
			c = TYPE_COMPRESSED_TCP;
		}
		else if(c == TYPE_UNCOMPRESSED_TCP)
		{
#ifdef IPR_VJ_USEBUFFER
			*cp &= 0x4f;		/* XXX */
#else
			*(mtod(m, u_char *)) &= 0x4f; 			
#endif			
		}

		/*
		 * We've got something that's not an IP packet.
		 * If compression is enabled, try to decompress it.
		 * Otherwise, if `auto-enable' compression is on and
		 * it's a reasonable packet, decompress it and then
		 * enable compression.  Otherwise, drop it.
		 */
		if(sc->sc_ifp->if_flags & IPR_COMPRESS)
		{
#ifdef IPR_VJ_USEBUFFER
			len = sl_uncompress_tcp(&cp,len,(u_int)c,&sc->sc_compr);
#else
			len = sl_uncompress_tcp((u_char **)&m->m_data, len,
					(u_int)c, &sc->sc_compr);
#endif			

			if(len <= 0)
			{
#ifdef DEBUG_IPR_VJ
				printf("i4b_ipr, ipr_rx_data_rdy: len <= 0 IPR_COMPRESS!\n");
#endif
				goto error;
			}
		}
		else if((sc->sc_ifp->if_flags & IPR_AUTOCOMP) &&
			(c == TYPE_UNCOMPRESSED_TCP) && (len >= 40))
		{
#ifdef IPR_VJ_USEBUFFER
			len = sl_uncompress_tcp(&cp,len,(u_int)c,&sc->sc_compr);
#else
			len = sl_uncompress_tcp((u_char **)&m->m_data, len,
					(u_int)c, &sc->sc_compr);
#endif

			if(len <= 0)
			{
#ifdef DEBUG_IPR_VJ
				printf("i4b_ipr, ipr_rx_data_rdy: len <= 0 IPR_AUTOCOMP!\n");
#endif
				goto error;
			}

			sc->sc_ifp->if_flags |= IPR_COMPRESS;
		}
		else
		{
#ifdef DEBUG_IPR_VJ
			printf("i4b_ipr, ipr_input: invalid ip packet!\n");
#endif

error:
			sc->sc_ifp->if_ierrors++;
			sc->sc_ifp->if_collisions++;
			m_freem(m);
			return;
		}
#ifdef IPR_VJ_USEBUFFER
/* XXX */	m_copyback(m, 0, len, cp);
#else
		m->m_len = m->m_pkthdr.len = len;
#endif
	}
#endif

#if I4BIPRACCT
	/* NB. do the accounting after decompression!		*/
	sc->sc_inb += m->m_pkthdr.len;
#endif

#if IPR_LOG
	if(sc->sc_log_first > 0)
	{
		--(sc->sc_log_first);
		i4b_l4_packet_ind(BDRV_IPR, unit, 0, m );
	}
#endif

	if(bpf_peers_present(sc->sc_ifp->if_bpf))
	{
		/* prepend the address family as a four byte field */		
		struct mbuf mm;
		u_int af = AF_INET;
		mm.m_next = m;
		mm.m_len = 4;
		mm.m_data = (char *)&af;
		bpf_mtap(sc->sc_ifp->if_bpf, &mm);
	}

	if(netisr_queue(NETISR_IP, m))	/* (0) on success. */
	{
		NDBGL4(L4_IPRDBG, "ipr%d: ipintrq full!", unit);
		sc->sc_ifp->if_ierrors++;
		sc->sc_ifp->if_iqdrops++;		
	}
}

/*---------------------------------------------------------------------------*
 *	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
ipr_tx_queue_empty(int unit)
{
	register struct ipr_softc *sc = &ipr_softc[unit];
	register struct mbuf *m;
#ifdef	IPR_VJ	
	struct ip *ip;	
#endif
	int x = 0;

	if(sc->sc_state != ST_CONNECTED_A)
		return;
		
	for(;;)
	{
                IF_DEQUEUE(&sc->sc_fastq, m);
                if(m)
                {
			sc->sc_ifp->if_omcasts++;
		}
		else
		{
			IF_DEQUEUE(&sc->sc_ifp->if_snd, m);
			if(m == NULL)
				break;
		}

		microtime(&sc->sc_ifp->if_lastchange);
		
		if(bpf_peers_present(sc->sc_ifp->if_bpf))
		{
			/* prepend the address family as a four byte field */
	
			struct mbuf mm;
			u_int af = AF_INET;
			mm.m_next = m;
			mm.m_len = 4;
			mm.m_data = (char *)&af;
			bpf_mtap(sc->sc_ifp->if_bpf, &mm);
		}
	
#if I4BIPRACCT
		sc->sc_outb += m->m_pkthdr.len;	/* size before compression */
#endif

#ifdef IPR_VJ	
		if((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP)
		{
			if(sc->sc_ifp->if_flags & IPR_COMPRESS)
			{
				*mtod(m, u_char *) |= sl_compress_tcp(m, ip,
					&sc->sc_compr, 1);
			}
		}
#endif
		x = 1;

		IF_LOCK(isdn_linktab[unit]->tx_queue);
		if(_IF_QFULL(isdn_linktab[unit]->tx_queue))
		{
			NDBGL4(L4_IPRDBG, "ipr%d: tx queue full!", unit);
			m_freem(m);
		}
		else
		{
			sc->sc_ifp->if_obytes += m->m_pkthdr.len;

			sc->sc_ifp->if_opackets++;

			_IF_ENQUEUE(isdn_linktab[unit]->tx_queue, m);

		}
		IF_UNLOCK(isdn_linktab[unit]->tx_queue);
	}

	if(x)
		(*isdn_linktab[unit]->bch_tx_start)(isdn_linktab[unit]->unit, isdn_linktab[unit]->channel);
}

/*---------------------------------------------------------------------------*
 *	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
ipr_activity(int unit, int rxtx)
{
	ipr_softc[unit].sc_cdp->last_active_time = SECOND;
}

/*---------------------------------------------------------------------------*
 *	return this drivers linktab address
 *---------------------------------------------------------------------------*/
drvr_link_t *
ipr_ret_linktab(int unit)
{
	return(&ipr_drvr_linktab[unit]);
}

/*---------------------------------------------------------------------------*
 *	setup the isdn_linktab for this driver
 *---------------------------------------------------------------------------*/
void
ipr_set_linktab(int unit, isdn_link_t *ilt)
{
	isdn_linktab[unit] = ilt;
}

/*---------------------------------------------------------------------------*
 *	initialize this drivers linktab
 *---------------------------------------------------------------------------*/
static void
ipr_init_linktab(int unit)
{
	ipr_drvr_linktab[unit].unit = unit;
	ipr_drvr_linktab[unit].bch_rx_data_ready = ipr_rx_data_rdy;
	ipr_drvr_linktab[unit].bch_tx_queue_empty = ipr_tx_queue_empty;
	ipr_drvr_linktab[unit].bch_activity = ipr_activity;
	ipr_drvr_linktab[unit].line_connected = ipr_connect;
	ipr_drvr_linktab[unit].line_disconnected = ipr_disconnect;
	ipr_drvr_linktab[unit].dial_response = ipr_dialresponse;
	ipr_drvr_linktab[unit].updown_ind = ipr_updown;	
}

/*===========================================================================*/
OpenPOWER on IntegriCloud