summaryrefslogtreecommitdiffstats
path: root/sys/net/if_gif.c
blob: 350611d758f89dcbb17669774a18eae1f669da93 (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
/*	$FreeBSD$	*/
/*	$KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $	*/

/*-
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
 */

#include "opt_inet.h"
#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/conf.h>
#include <machine/cpu.h>

#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/vnet.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef	INET
#include <netinet/in_var.h>
#include <netinet/in_gif.h>
#include <netinet/ip_var.h>
#endif	/* INET */

#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/ip6protosw.h>
#endif /* INET6 */

#include <netinet/ip_encap.h>
#include <net/ethernet.h>
#include <net/if_bridgevar.h>
#include <net/if_gif.h>

#include <security/mac/mac_framework.h>

#define GIFNAME		"gif"

/*
 * gif_mtx protects the global gif_softc_list.
 */
static struct mtx gif_mtx;
static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list);
#define	V_gif_softc_list	VNET(gif_softc_list)

void	(*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
void	(*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
void	(*ng_gif_attach_p)(struct ifnet *ifp);
void	(*ng_gif_detach_p)(struct ifnet *ifp);

static void	gif_start(struct ifnet *);
static int	gif_clone_create(struct if_clone *, int, caddr_t);
static void	gif_clone_destroy(struct ifnet *);

IFC_SIMPLE_DECLARE(gif, 0);

static int gifmodevent(module_t, int, void *);

SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
    "Generic Tunnel Interface");
#ifndef MAX_GIF_NEST
/*
 * This macro controls the default upper limitation on nesting of gif tunnels.
 * Since, setting a large value to this macro with a careless configuration
 * may introduce system crash, we don't allow any nestings by default.
 * If you need to configure nested gif tunnels, you can define this macro
 * in your kernel configuration file.  However, if you do so, please be
 * careful to configure the tunnels so that it won't make a loop.
 */
#define MAX_GIF_NEST 1
#endif
static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST;
#define	V_max_gif_nesting	VNET(max_gif_nesting)
SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW,
    &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");

/*
 * By default, we disallow creation of multiple tunnels between the same
 * pair of addresses.  Some applications require this functionality so
 * we allow control over this check here.
 */
#ifdef XBONEHACK
static VNET_DEFINE(int, parallel_tunnels) = 1;
#else
static VNET_DEFINE(int, parallel_tunnels) = 0;
#endif
#define	V_parallel_tunnels	VNET(parallel_tunnels)
SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW,
    &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?");

/* copy from src/sys/net/if_ethersubr.c */
static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
#ifndef ETHER_IS_BROADCAST
#define ETHER_IS_BROADCAST(addr) \
	(bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
#endif

static int
gif_clone_create(ifc, unit, params)
	struct if_clone *ifc;
	int unit;
	caddr_t params;
{
	struct gif_softc *sc;

	sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
	sc->gif_fibnum = curthread->td_proc->p_fibnum;
	GIF2IFP(sc) = if_alloc(IFT_GIF);
	if (GIF2IFP(sc) == NULL) {
		free(sc, M_GIF);
		return (ENOSPC);
	}

	GIF_LOCK_INIT(sc);

	GIF2IFP(sc)->if_softc = sc;
	if_initname(GIF2IFP(sc), ifc->ifc_name, unit);

	sc->encap_cookie4 = sc->encap_cookie6 = NULL;
	sc->gif_options = GIF_ACCEPT_REVETHIP;

	GIF2IFP(sc)->if_addrlen = 0;
	GIF2IFP(sc)->if_mtu    = GIF_MTU;
	GIF2IFP(sc)->if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
#if 0
	/* turn off ingress filter */
	GIF2IFP(sc)->if_flags  |= IFF_LINK2;
#endif
	GIF2IFP(sc)->if_ioctl  = gif_ioctl;
	GIF2IFP(sc)->if_start  = gif_start;
	GIF2IFP(sc)->if_output = gif_output;
	GIF2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen;
	if_attach(GIF2IFP(sc));
	bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
	if (ng_gif_attach_p != NULL)
		(*ng_gif_attach_p)(GIF2IFP(sc));

	mtx_lock(&gif_mtx);
	LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list);
	mtx_unlock(&gif_mtx);

	return (0);
}

static void
gif_clone_destroy(ifp)
	struct ifnet *ifp;
{
#if defined(INET) || defined(INET6)
	int err;
#endif
	struct gif_softc *sc = ifp->if_softc;

	mtx_lock(&gif_mtx);
	LIST_REMOVE(sc, gif_list);
	mtx_unlock(&gif_mtx);

	gif_delete_tunnel(ifp);
#ifdef INET6
	if (sc->encap_cookie6 != NULL) {
		err = encap_detach(sc->encap_cookie6);
		KASSERT(err == 0, ("Unexpected error detaching encap_cookie6"));
	}
#endif
#ifdef INET
	if (sc->encap_cookie4 != NULL) {
		err = encap_detach(sc->encap_cookie4);
		KASSERT(err == 0, ("Unexpected error detaching encap_cookie4"));
	}
#endif

	if (ng_gif_detach_p != NULL)
		(*ng_gif_detach_p)(ifp);
	bpfdetach(ifp);
	if_detach(ifp);
	if_free(ifp);

	GIF_LOCK_DESTROY(sc);

	free(sc, M_GIF);
}

static void
vnet_gif_init(const void *unused __unused)
{

	LIST_INIT(&V_gif_softc_list);
}
VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_gif_init,
    NULL);

static int
gifmodevent(mod, type, data)
	module_t mod;
	int type;
	void *data;
{

	switch (type) {
	case MOD_LOAD:
		mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF);
		if_clone_attach(&gif_cloner);
		break;

	case MOD_UNLOAD:
		if_clone_detach(&gif_cloner);
		mtx_destroy(&gif_mtx);
		break;
	default:
		return EOPNOTSUPP;
	}
	return 0;
}

static moduledata_t gif_mod = {
	"if_gif",
	gifmodevent,
	0
};

DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_gif, 1);

int
gif_encapcheck(m, off, proto, arg)
	const struct mbuf *m;
	int off;
	int proto;
	void *arg;
{
	struct ip ip;
	struct gif_softc *sc;

	sc = (struct gif_softc *)arg;
	if (sc == NULL)
		return 0;

	if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0)
		return 0;

	/* no physical address */
	if (!sc->gif_psrc || !sc->gif_pdst)
		return 0;

	switch (proto) {
#ifdef INET
	case IPPROTO_IPV4:
		break;
#endif
#ifdef INET6
	case IPPROTO_IPV6:
		break;
#endif
	case IPPROTO_ETHERIP:
		break;

	default:
		return 0;
	}

	/* Bail on short packets */
	if (m->m_pkthdr.len < sizeof(ip))
		return 0;

	m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);

	switch (ip.ip_v) {
#ifdef INET
	case 4:
		if (sc->gif_psrc->sa_family != AF_INET ||
		    sc->gif_pdst->sa_family != AF_INET)
			return 0;
		return gif_encapcheck4(m, off, proto, arg);
#endif
#ifdef INET6
	case 6:
		if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
			return 0;
		if (sc->gif_psrc->sa_family != AF_INET6 ||
		    sc->gif_pdst->sa_family != AF_INET6)
			return 0;
		return gif_encapcheck6(m, off, proto, arg);
#endif
	default:
		return 0;
	}
}

static void
gif_start(struct ifnet *ifp)
{
	struct gif_softc *sc;
	struct mbuf *m;

	sc = ifp->if_softc;

	ifp->if_drv_flags |= IFF_DRV_OACTIVE;
	for (;;) {
		IFQ_DEQUEUE(&ifp->if_snd, m);
		if (m == 0)
			break;

		gif_output(ifp, m, sc->gif_pdst, NULL);

	}
	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;

	return;
}

int
gif_output(ifp, m, dst, ro)
	struct ifnet *ifp;
	struct mbuf *m;
	struct sockaddr *dst;
	struct route *ro;
{
	struct gif_softc *sc = ifp->if_softc;
	struct m_tag *mtag;
	int error = 0;
	int gif_called;
	u_int32_t af;

#ifdef MAC
	error = mac_ifnet_check_transmit(ifp, m);
	if (error) {
		m_freem(m);
		goto end;
	}
#endif

	/*
	 * gif may cause infinite recursion calls when misconfigured.
	 * We'll prevent this by detecting loops.
	 *
	 * High nesting level may cause stack exhaustion.
	 * We'll prevent this by introducing upper limit.
	 */
	gif_called = 1;
	mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL);
	while (mtag != NULL) {
		if (*(struct ifnet **)(mtag + 1) == ifp) {
			log(LOG_NOTICE,
			    "gif_output: loop detected on %s\n",
			    (*(struct ifnet **)(mtag + 1))->if_xname);
			m_freem(m);
			error = EIO;	/* is there better errno? */
			goto end;
		}
		mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag);
		gif_called++;
	}
	if (gif_called > V_max_gif_nesting) {
		log(LOG_NOTICE,
		    "gif_output: recursively called too many times(%d)\n",
		    gif_called);
		m_freem(m);
		error = EIO;	/* is there better errno? */
		goto end;
	}
	mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *),
	    M_NOWAIT);
	if (mtag == NULL) {
		m_freem(m);
		error = ENOMEM;
		goto end;
	}
	*(struct ifnet **)(mtag + 1) = ifp;
	m_tag_prepend(m, mtag);

	m->m_flags &= ~(M_BCAST|M_MCAST);

	GIF_LOCK(sc);

	if (!(ifp->if_flags & IFF_UP) ||
	    sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
		GIF_UNLOCK(sc);
		m_freem(m);
		error = ENETDOWN;
		goto end;
	}

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

	af = dst->sa_family;
	BPF_MTAP2(ifp, &af, sizeof(af), m);
	ifp->if_opackets++;	
	ifp->if_obytes += m->m_pkthdr.len;

	/* override to IPPROTO_ETHERIP for bridged traffic */
	if (ifp->if_bridge)
		af = AF_LINK;

	M_SETFIB(m, sc->gif_fibnum);
	/* inner AF-specific encapsulation */

	/* XXX should we check if our outer source is legal? */

	/* dispatch to output logic based on outer AF */
	switch (sc->gif_psrc->sa_family) {
#ifdef INET
	case AF_INET:
		error = in_gif_output(ifp, af, m);
		break;
#endif
#ifdef INET6
	case AF_INET6:
		error = in6_gif_output(ifp, af, m);
		break;
#endif
	default:
		m_freem(m);		
		error = ENETDOWN;
	}

	GIF_UNLOCK(sc);
  end:
	if (error)
		ifp->if_oerrors++;
	return (error);
}

void
gif_input(m, af, ifp)
	struct mbuf *m;
	int af;
	struct ifnet *ifp;
{
	int isr, n;
	struct gif_softc *sc;
	struct etherip_header *eip;
	struct ether_header *eh;
	struct ifnet *oldifp;

	if (ifp == NULL) {
		/* just in case */
		m_freem(m);
		return;
	}
	sc = ifp->if_softc;
	m->m_pkthdr.rcvif = ifp;

#ifdef MAC
	mac_ifnet_create_mbuf(ifp, m);
#endif

	if (bpf_peers_present(ifp->if_bpf)) {
		u_int32_t af1 = af;
		bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
	}

	if (ng_gif_input_p != NULL) {
		(*ng_gif_input_p)(ifp, &m, af);
		if (m == NULL)
			return;
	}

	/*
	 * Put the packet to the network layer input queue according to the
	 * specified address family.
	 * Note: older versions of gif_input directly called network layer
	 * input functions, e.g. ip6_input, here.  We changed the policy to
	 * prevent too many recursive calls of such input functions, which
	 * might cause kernel panic.  But the change may introduce another
	 * problem; if the input queue is full, packets are discarded.
	 * The kernel stack overflow really happened, and we believed
	 * queue-full rarely occurs, so we changed the policy.
	 */
	switch (af) {
#ifdef INET
	case AF_INET:
		isr = NETISR_IP;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		isr = NETISR_IPV6;
		break;
#endif
	case AF_LINK:
		n = sizeof(struct etherip_header) + sizeof(struct ether_header);
		if (n > m->m_len) {
			m = m_pullup(m, n);
			if (m == NULL) {
				ifp->if_ierrors++;
				return;
			}
		}

		eip = mtod(m, struct etherip_header *);
		/* 
		 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally
		 * accepts an EtherIP packet with revered version field in
		 * the header.  This is a knob for backward compatibility
		 * with FreeBSD 7.2R or prior.
		 */
		if (sc->gif_options & GIF_ACCEPT_REVETHIP) {
			if (eip->eip_resvl != ETHERIP_VERSION
			    && eip->eip_ver != ETHERIP_VERSION) {
				/* discard unknown versions */
				m_freem(m);
				return;
			}
		} else {
			if (eip->eip_ver != ETHERIP_VERSION) {
				/* discard unknown versions */
				m_freem(m);
				return;
			}
		}
		m_adj(m, sizeof(struct etherip_header));

		m->m_flags &= ~(M_BCAST|M_MCAST);
		m->m_pkthdr.rcvif = ifp;

		if (ifp->if_bridge) {
			oldifp = ifp;
			eh = mtod(m, struct ether_header *);
			if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
				if (ETHER_IS_BROADCAST(eh->ether_dhost))
					m->m_flags |= M_BCAST;
				else
					m->m_flags |= M_MCAST;
				ifp->if_imcasts++;
			}
			BRIDGE_INPUT(ifp, m);

			if (m != NULL && ifp != oldifp) {
				/*
				 * The bridge gave us back itself or one of the
				 * members for which the frame is addressed.
				 */
				ether_demux(ifp, m);
				return;
			}
		}
		if (m != NULL)
			m_freem(m);
		return;

	default:
		if (ng_gif_input_orphan_p != NULL)
			(*ng_gif_input_orphan_p)(ifp, m, af);
		else
			m_freem(m);
		return;
	}

	ifp->if_ipackets++;
	ifp->if_ibytes += m->m_pkthdr.len;
	M_SETFIB(m, ifp->if_fib);
	netisr_dispatch(isr, m);
}

/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
int
gif_ioctl(ifp, cmd, data)
	struct ifnet *ifp;
	u_long cmd;
	caddr_t data;
{
	struct gif_softc *sc  = ifp->if_softc;
	struct ifreq     *ifr = (struct ifreq*)data;
	int error = 0, size;
	u_int	options;
	struct sockaddr *dst, *src;
#ifdef	SIOCSIFMTU /* xxx */
	u_long mtu;
#endif

	switch (cmd) {
	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;
		break;
		
	case SIOCSIFDSTADDR:
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		break;

#ifdef	SIOCSIFMTU /* xxx */
	case SIOCGIFMTU:
		break;

	case SIOCSIFMTU:
		mtu = ifr->ifr_mtu;
		if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX)
			return (EINVAL);
		ifp->if_mtu = mtu;
		break;
#endif /* SIOCSIFMTU */

#ifdef INET
	case SIOCSIFPHYADDR:
#endif
#ifdef INET6
	case SIOCSIFPHYADDR_IN6:
#endif /* INET6 */
	case SIOCSLIFPHYADDR:
		switch (cmd) {
#ifdef INET
		case SIOCSIFPHYADDR:
			src = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_addr);
			dst = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_dstaddr);
			break;
#endif
#ifdef INET6
		case SIOCSIFPHYADDR_IN6:
			src = (struct sockaddr *)
				&(((struct in6_aliasreq *)data)->ifra_addr);
			dst = (struct sockaddr *)
				&(((struct in6_aliasreq *)data)->ifra_dstaddr);
			break;
#endif
		case SIOCSLIFPHYADDR:
			src = (struct sockaddr *)
				&(((struct if_laddrreq *)data)->addr);
			dst = (struct sockaddr *)
				&(((struct if_laddrreq *)data)->dstaddr);
			break;
		default:
			return EINVAL;
		}

		/* sa_family must be equal */
		if (src->sa_family != dst->sa_family)
			return EINVAL;

		/* validate sa_len */
		switch (src->sa_family) {
#ifdef INET
		case AF_INET:
			if (src->sa_len != sizeof(struct sockaddr_in))
				return EINVAL;
			break;
#endif
#ifdef INET6
		case AF_INET6:
			if (src->sa_len != sizeof(struct sockaddr_in6))
				return EINVAL;
			break;
#endif
		default:
			return EAFNOSUPPORT;
		}
		switch (dst->sa_family) {
#ifdef INET
		case AF_INET:
			if (dst->sa_len != sizeof(struct sockaddr_in))
				return EINVAL;
			break;
#endif
#ifdef INET6
		case AF_INET6:
			if (dst->sa_len != sizeof(struct sockaddr_in6))
				return EINVAL;
			break;
#endif
		default:
			return EAFNOSUPPORT;
		}

		/* check sa_family looks sane for the cmd */
		switch (cmd) {
		case SIOCSIFPHYADDR:
			if (src->sa_family == AF_INET)
				break;
			return EAFNOSUPPORT;
#ifdef INET6
		case SIOCSIFPHYADDR_IN6:
			if (src->sa_family == AF_INET6)
				break;
			return EAFNOSUPPORT;
#endif /* INET6 */
		case SIOCSLIFPHYADDR:
			/* checks done in the above */
			break;
		}

		error = gif_set_tunnel(GIF2IFP(sc), src, dst);
		break;

#ifdef SIOCDIFPHYADDR
	case SIOCDIFPHYADDR:
		gif_delete_tunnel(GIF2IFP(sc));
		break;
#endif
			
	case SIOCGIFPSRCADDR:
#ifdef INET6
	case SIOCGIFPSRCADDR_IN6:
#endif /* INET6 */
		if (sc->gif_psrc == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}
		src = sc->gif_psrc;
		switch (cmd) {
#ifdef INET
		case SIOCGIFPSRCADDR:
			dst = &ifr->ifr_addr;
			size = sizeof(ifr->ifr_addr);
			break;
#endif /* INET */
#ifdef INET6
		case SIOCGIFPSRCADDR_IN6:
			dst = (struct sockaddr *)
				&(((struct in6_ifreq *)data)->ifr_addr);
			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
			break;
#endif /* INET6 */
		default:
			error = EADDRNOTAVAIL;
			goto bad;
		}
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
#ifdef INET6
		if (dst->sa_family == AF_INET6) {
			error = sa6_recoverscope((struct sockaddr_in6 *)dst);
			if (error != 0)
				return (error);
		}
#endif
		break;
			
	case SIOCGIFPDSTADDR:
#ifdef INET6
	case SIOCGIFPDSTADDR_IN6:
#endif /* INET6 */
		if (sc->gif_pdst == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}
		src = sc->gif_pdst;
		switch (cmd) {
#ifdef INET
		case SIOCGIFPDSTADDR:
			dst = &ifr->ifr_addr;
			size = sizeof(ifr->ifr_addr);
			break;
#endif /* INET */
#ifdef INET6
		case SIOCGIFPDSTADDR_IN6:
			dst = (struct sockaddr *)
				&(((struct in6_ifreq *)data)->ifr_addr);
			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
			break;
#endif /* INET6 */
		default:
			error = EADDRNOTAVAIL;
			goto bad;
		}
		if (src->sa_len > size)
			return EINVAL;
		error = prison_if(curthread->td_ucred, src);
		if (error != 0)
			return (error);
		error = prison_if(curthread->td_ucred, dst);
		if (error != 0)
			return (error);
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
#ifdef INET6
		if (dst->sa_family == AF_INET6) {
			error = sa6_recoverscope((struct sockaddr_in6 *)dst);
			if (error != 0)
				return (error);
		}
#endif
		break;

	case SIOCGLIFPHYADDR:
		if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}

		/* copy src */
		src = sc->gif_psrc;
		dst = (struct sockaddr *)
			&(((struct if_laddrreq *)data)->addr);
		size = sizeof(((struct if_laddrreq *)data)->addr);
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);

		/* copy dst */
		src = sc->gif_pdst;
		dst = (struct sockaddr *)
			&(((struct if_laddrreq *)data)->dstaddr);
		size = sizeof(((struct if_laddrreq *)data)->dstaddr);
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
		break;

	case SIOCSIFFLAGS:
		/* if_ioctl() takes care of it */
		break;

	case GIFGOPTS:
		options = sc->gif_options;
		error = copyout(&options, ifr->ifr_data,
				sizeof(options));
		break;

	case GIFSOPTS:
		if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
			break;
		error = copyin(ifr->ifr_data, &options, sizeof(options));
		if (error)
			break;
		if (options & ~GIF_OPTMASK)
			error = EINVAL;
		else
			sc->gif_options = options;
		break;

	default:
		error = EINVAL;
		break;
	}
 bad:
	return error;
}

/*
 * XXXRW: There's a general event-ordering issue here: the code to check
 * if a given tunnel is already present happens before we perform a
 * potentially blocking setup of the tunnel.  This code needs to be
 * re-ordered so that the check and replacement can be atomic using
 * a mutex.
 */
int
gif_set_tunnel(ifp, src, dst)
	struct ifnet *ifp;
	struct sockaddr *src;
	struct sockaddr *dst;
{
	struct gif_softc *sc = ifp->if_softc;
	struct gif_softc *sc2;
	struct sockaddr *osrc, *odst, *sa;
	int error = 0; 

	mtx_lock(&gif_mtx);
	LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) {
		if (sc2 == sc)
			continue;
		if (!sc2->gif_pdst || !sc2->gif_psrc)
			continue;
		if (sc2->gif_pdst->sa_family != dst->sa_family ||
		    sc2->gif_pdst->sa_len != dst->sa_len ||
		    sc2->gif_psrc->sa_family != src->sa_family ||
		    sc2->gif_psrc->sa_len != src->sa_len)
			continue;

		/*
		 * Disallow parallel tunnels unless instructed
		 * otherwise.
		 */
		if (!V_parallel_tunnels &&
		    bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
		    bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
			error = EADDRNOTAVAIL;
			mtx_unlock(&gif_mtx);
			goto bad;
		}

		/* XXX both end must be valid? (I mean, not 0.0.0.0) */
	}
	mtx_unlock(&gif_mtx);

	/* XXX we can detach from both, but be polite just in case */
	if (sc->gif_psrc)
		switch (sc->gif_psrc->sa_family) {
#ifdef INET
		case AF_INET:
			(void)in_gif_detach(sc);
			break;
#endif
#ifdef INET6
		case AF_INET6:
			(void)in6_gif_detach(sc);
			break;
#endif
		}

	osrc = sc->gif_psrc;
	sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
	bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
	sc->gif_psrc = sa;

	odst = sc->gif_pdst;
	sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
	bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
	sc->gif_pdst = sa;

	switch (sc->gif_psrc->sa_family) {
#ifdef INET
	case AF_INET:
		error = in_gif_attach(sc);
		break;
#endif
#ifdef INET6
	case AF_INET6:
		/*
		 * Check validity of the scope zone ID of the addresses, and
		 * convert it into the kernel internal form if necessary.
		 */
		error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0);
		if (error != 0)
			break;
		error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0);
		if (error != 0)
			break;
		error = in6_gif_attach(sc);
		break;
#endif
	}
	if (error) {
		/* rollback */
		free((caddr_t)sc->gif_psrc, M_IFADDR);
		free((caddr_t)sc->gif_pdst, M_IFADDR);
		sc->gif_psrc = osrc;
		sc->gif_pdst = odst;
		goto bad;
	}

	if (osrc)
		free((caddr_t)osrc, M_IFADDR);
	if (odst)
		free((caddr_t)odst, M_IFADDR);

 bad:
	if (sc->gif_psrc && sc->gif_pdst)
		ifp->if_drv_flags |= IFF_DRV_RUNNING;
	else
		ifp->if_drv_flags &= ~IFF_DRV_RUNNING;

	return error;
}

void
gif_delete_tunnel(ifp)
	struct ifnet *ifp;
{
	struct gif_softc *sc = ifp->if_softc;

	if (sc->gif_psrc) {
		free((caddr_t)sc->gif_psrc, M_IFADDR);
		sc->gif_psrc = NULL;
	}
	if (sc->gif_pdst) {
		free((caddr_t)sc->gif_pdst, M_IFADDR);
		sc->gif_pdst = NULL;
	}
	/* it is safe to detach from both */
#ifdef INET
	(void)in_gif_detach(sc);
#endif
#ifdef INET6
	(void)in6_gif_detach(sc);
#endif
	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
OpenPOWER on IntegriCloud