summaryrefslogtreecommitdiffstats
path: root/sys/netinet6/ip6_fw.c
blob: ae1c0f1251a6a23fc463973a5f62f37c39b97457 (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
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
/*	$FreeBSD$	*/
/*	$KAME: ip6_fw.c,v 1.15 2000/07/02 14:17:37 itojun Exp $	*/

/*
 * Copyright (c) 1993 Daniel Boulet
 * Copyright (c) 1994 Ugen J.S.Antsilevich
 * Copyright (c) 1996 Alex Nash
 *
 * Redistribution and use in source forms, with and without modification,
 * are permitted provided that this entire comment appears intact.
 *
 * Redistribution in binary form may occur without any restrictions.
 * Obviously, it would be nice if you gave credit where credit is due
 * but requiring it would be too onerous.
 *
 * This software is provided ``AS IS'' without any warranties of any kind.
 */

/*
 * Implement IPv6 packet firewall
 */

#if !defined(KLD_MODULE)
#include "opt_ip6fw.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#endif

#ifdef IP6DIVERT
#error "NOT SUPPORTED IPV6 DIVERT"
#endif
#ifdef IP6FW_DIVERT_RESTART
#error "NOT SUPPORTED IPV6 DIVERT"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/time.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <netinet/icmp6.h>

#include <netinet/in_pcb.h>

#include <netinet6/ip6_fw.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>

#include <sys/sysctl.h>

#include <net/net_osdep.h>

MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");

static int fw6_debug = 1;
#ifdef IPV6FIREWALL_VERBOSE
static int fw6_verbose = 1;
#else
static int fw6_verbose = 0;
#endif
#ifdef IPV6FIREWALL_VERBOSE_LIMIT
static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
#else
static int fw6_verbose_limit = 0;
#endif

LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;

#ifdef SYSCTL_NODE
SYSCTL_DECL(_net_inet6_ip6);
SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW,
    &ip6_fw_enable, 0, "Enable ip6fw");
SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW, &fw6_debug, 0, "");
SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW, &fw6_verbose, 0, "");
SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW, &fw6_verbose_limit, 0, "");
#endif

#define dprintf(a)	if (!fw6_debug); else printf a

#define print_ip6(a)	printf("[%s]", ip6_sprintf(a))

#define dprint_ip6(a)	if (!fw6_debug); else print_ip6(a)

static int	add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl));
static int	del_entry6 __P((struct ip6_fw_head *chainptr, u_short number));
static int	zero_entry6 __P((struct mbuf *m));
static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m));
static struct ip6_fw *check_ip6fw_mbuf __P((struct mbuf *fw));
static int	ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f,
				   struct mbuf **m,
				   int *off, int *nxt, u_short *offset));
static int	port_match6 __P((u_short *portptr, int nports, u_short port,
				int range_flag));
static int	tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f));
static int	icmp6type_match __P((struct icmp6_hdr *  icmp, struct ip6_fw * f));
static void	ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6,
				struct ifnet *rif, struct ifnet *oif, int off, int nxt));

static int	ip6_fw_chk __P((struct ip6_hdr **pip6,
			struct ifnet *oif, u_int16_t *cookie, struct mbuf **m));
static int	ip6_fw_ctl __P((int stage, struct mbuf **mm));

static char err_prefix[] = "ip6_fw_ctl:";

/*
 * Returns 1 if the port is matched by the vector, 0 otherwise
 */
static
__inline int
port_match6(u_short *portptr, int nports, u_short port, int range_flag)
{
	if (!nports)
		return 1;
	if (range_flag) {
		if (portptr[0] <= port && port <= portptr[1]) {
			return 1;
		}
		nports -= 2;
		portptr += 2;
	}
	while (nports-- > 0) {
		if (*portptr++ == port) {
			return 1;
		}
	}
	return 0;
}

static int
tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f)
{
	u_char		flg_set, flg_clr;
	
	/*
	 * If an established connection is required, reject packets that
	 * have only SYN of RST|ACK|SYN set.  Otherwise, fall through to
	 * other flag requirements.
	 */
	if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) &&
	    ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK |
	    IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN))
		return 0;

	flg_set = tcp6->th_flags & f->fw_tcpf;
	flg_clr = tcp6->th_flags & f->fw_tcpnf;

	if (flg_set != f->fw_tcpf)
		return 0;
	if (flg_clr)
		return 0;

	return 1;
}

static int
icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f)
{
	int type;

	if (!(f->fw_flg & IPV6_FW_F_ICMPBIT))
		return(1);

	type = icmp6->icmp6_type;

	/* check for matching type in the bitmap */
	if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 &&
		(f->fw_icmp6types[type / (sizeof(unsigned) * 8)] &
		(1U << (type % (8 * sizeof(unsigned))))))
		return(1);

	return(0); /* no match */
}

static int
is_icmp6_query(struct ip6_hdr *ip6, int off)
{
	const struct icmp6_hdr *icmp6;
	int icmp6_type;

	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
	icmp6_type = icmp6->icmp6_type;

	if (icmp6_type == ICMP6_ECHO_REQUEST ||
	    icmp6_type == ICMP6_MEMBERSHIP_QUERY ||
	    icmp6_type == ICMP6_WRUREQUEST ||
	    icmp6_type == ICMP6_FQDN_QUERY ||
	    icmp6_type == ICMP6_NI_QUERY)
		return(1);

	return(0);
}

static int
ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m,
	      int *off, int *nxt, u_short *offset)
{
	int len;
	struct ip6_hdr *ip6 = *pip6;
	struct ip6_ext *ip6e;
	u_char	opts, nopts, nopts_sve;

	opts = f->fw_ip6opt;
	nopts = nopts_sve = f->fw_ip6nopt;

	*nxt = ip6->ip6_nxt;
	*off = sizeof(struct ip6_hdr);
	len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
	while (*off < len) {
		ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off);
		if ((*m)->m_len < *off + sizeof(*ip6e))
			goto opts_check;	/* XXX */

		switch(*nxt) {
		case IPPROTO_FRAGMENT:
			if ((*m)->m_len < *off + sizeof(struct ip6_frag)) {
				struct ip6_frag *ip6f;

				ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off);
				*offset = ip6f->ip6f_offlg | IP6F_OFF_MASK;
			}
			opts &= ~IPV6_FW_IP6OPT_FRAG;
			nopts &= ~IPV6_FW_IP6OPT_FRAG;
			*off += sizeof(struct ip6_frag);
			break;
		case IPPROTO_AH:
			opts &= ~IPV6_FW_IP6OPT_AH;
			nopts &= ~IPV6_FW_IP6OPT_AH;
			*off += (ip6e->ip6e_len + 2) << 2;
			break;
		default:
			switch (*nxt) {
			case IPPROTO_HOPOPTS:
				opts &= ~IPV6_FW_IP6OPT_HOPOPT;
				nopts &= ~IPV6_FW_IP6OPT_HOPOPT;
				break;
			case IPPROTO_ROUTING:
				opts &= ~IPV6_FW_IP6OPT_ROUTE;
				nopts &= ~IPV6_FW_IP6OPT_ROUTE;
				break;
			case IPPROTO_ESP:
				opts &= ~IPV6_FW_IP6OPT_ESP;
				nopts &= ~IPV6_FW_IP6OPT_ESP;
				break;
			case IPPROTO_NONE:
				opts &= ~IPV6_FW_IP6OPT_NONXT;
				nopts &= ~IPV6_FW_IP6OPT_NONXT;
				goto opts_check;
				break;
			case IPPROTO_DSTOPTS:
				opts &= ~IPV6_FW_IP6OPT_OPTS;
				nopts &= ~IPV6_FW_IP6OPT_OPTS;
				break;
			default:
				goto opts_check;
				break;
			}
			*off += (ip6e->ip6e_len + 1) << 3;
			break;
		}
		*nxt = ip6e->ip6e_nxt;

	}
 opts_check:
	if (f->fw_ip6opt == f->fw_ip6nopt)	/* XXX */
		return 1;

	if (opts == 0 && nopts == nopts_sve)
		return 1;
	else
		return 0;
}

static
__inline int
iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
{
	/* Check by name or by IP address */
	if (byname) {
		/* Check unit number (-1 is wildcard) */
		if (ifu->fu_via_if.unit != -1
		    && ifp->if_unit != ifu->fu_via_if.unit)
			return(0);
		/* Check name */
		if (strncmp(ifp->if_name, ifu->fu_via_if.name, IP6FW_IFNLEN))
			return(0);
		return(1);
	} else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) {	/* Zero == wildcard */
		struct ifaddr *ia;

		for (ia = ifp->if_addrlist.tqh_first; ia; ia = ia->ifa_list.tqe_next)
		{

			if (ia->ifa_addr == NULL)
				continue;
			if (ia->ifa_addr->sa_family != AF_INET6)
				continue;
			if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
			    &(((struct sockaddr_in6 *)
			    (ia->ifa_addr))->sin6_addr)))
				continue;
			return(1);
		}
		return(0);
	}
	return(1);
}

static void
ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
	struct ifnet *rif, struct ifnet *oif, int off, int nxt)
{
	static int counter;
	struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
	struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
	struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
	int count;

	count = f ? f->fw_pcnt : ++counter;
	if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
		return;

	/* Print command name */
	printf("ip6fw: %d ", f ? f->fw_number : -1);
	if (!f)
		printf("Refuse");
	else
		switch (f->fw_flg & IPV6_FW_F_COMMAND) {
		case IPV6_FW_F_DENY:
			printf("Deny");
			break;
		case IPV6_FW_F_REJECT:
			if (f->fw_reject_code == IPV6_FW_REJECT_RST)
				printf("Reset");
			else
				printf("Unreach");
			break;
		case IPV6_FW_F_ACCEPT:
			printf("Accept");
			break;
		case IPV6_FW_F_COUNT:
			printf("Count");
			break;
		case IPV6_FW_F_DIVERT:
			printf("Divert %d", f->fw_divert_port);
			break;
		case IPV6_FW_F_TEE:
			printf("Tee %d", f->fw_divert_port);
			break;
		case IPV6_FW_F_SKIPTO:
			printf("SkipTo %d", f->fw_skipto_rule);
			break;
		default:	
			printf("UNKNOWN");
			break;
		}
	printf(" ");

	switch (nxt) {
	case IPPROTO_TCP:
		printf("TCP ");
		print_ip6(&ip6->ip6_src);
		if (off > 0)
			printf(":%d ", ntohs(tcp6->th_sport));
		else
			printf(" ");
		print_ip6(&ip6->ip6_dst);
		if (off > 0)
			printf(":%d", ntohs(tcp6->th_dport));
		break;
	case IPPROTO_UDP:
		printf("UDP ");
		print_ip6(&ip6->ip6_src);
		if (off > 0)
			printf(":%d ", ntohs(udp->uh_sport));
		else
			printf(" ");
		print_ip6(&ip6->ip6_dst);
		if (off > 0)
			printf(":%d", ntohs(udp->uh_dport));
		break;
	case IPPROTO_ICMPV6:
		if (off > 0)
			printf("IPV6-ICMP:%u.%u ", icmp6->icmp6_type, icmp6->icmp6_code);
		else
			printf("IPV6-ICMP ");
		print_ip6(&ip6->ip6_src);
		printf(" ");
		print_ip6(&ip6->ip6_dst);
		break;
	default:
		printf("P:%d ", nxt);
		print_ip6(&ip6->ip6_src);
		printf(" ");
		print_ip6(&ip6->ip6_dst);
		break;
	}
	if (oif)
		printf(" out via %s", if_name(oif));
	else if (rif)
		printf(" in via %s", if_name(rif));
	printf("\n");
	if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
		printf("ip6fw: limit reached on rule #%d\n",
		f ? f->fw_number : -1);
}

/*
 * Parameters:
 *
 *	ip	Pointer to packet header (struct ip6_hdr *)
 *	hlen	Packet header length
 *	oif	Outgoing interface, or NULL if packet is incoming
 * #ifndef IP6FW_DIVERT_RESTART
 *	*cookie	Ignore all divert/tee rules to this port (if non-zero)
 * #else
 *	*cookie Skip up to the first rule past this rule number;
 * #endif
 *	*m	The packet; we set to NULL when/if we nuke it.
 *
 * Return value:
 *
 *	0	The packet is to be accepted and routed normally OR
 *      	the packet was denied/rejected and has been dropped;
 *		in the latter case, *m is equal to NULL upon return.
 *	port	Divert the packet to port.
 */

static int
ip6_fw_chk(struct ip6_hdr **pip6,
	struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
{
	struct ip6_fw_chain *chain;
	struct ip6_fw *rule = NULL;
	struct ip6_hdr *ip6 = *pip6;
	struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
	u_short offset = 0;
	int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
	u_short src_port, dst_port;
#ifdef	IP6FW_DIVERT_RESTART
	u_int16_t skipto = *cookie;
#else
	u_int16_t ignport = ntohs(*cookie);
#endif

	*cookie = 0;
	/*
	 * Go down the chain, looking for enlightment
	 * #ifdef IP6FW_DIVERT_RESTART
	 * If we've been asked to start at a given rule immediatly, do so.
	 * #endif
	 */
	chain = LIST_FIRST(&ip6_fw_chain);
#ifdef IP6FW_DIVERT_RESTART
	if (skipto) {
		if (skipto >= 65535)
			goto dropit;
		while (chain && (chain->rule->fw_number <= skipto)) {
			chain = LIST_NEXT(chain, chain);
		}
		if (! chain) goto dropit;
	}
#endif /* IP6FW_DIVERT_RESTART */
	for (; chain; chain = LIST_NEXT(chain, chain)) {
		register struct ip6_fw *const f = chain->rule;

		if (oif) {
			/* Check direction outbound */
			if (!(f->fw_flg & IPV6_FW_F_OUT))
				continue;
		} else {
			/* Check direction inbound */
			if (!(f->fw_flg & IPV6_FW_F_IN))
				continue;
		}

#define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
	(((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
	(((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
	(((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
	(((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))

		/* If src-addr doesn't match, not this rule. */
		if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
			(!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
			continue;

		/* If dest-addr doesn't match, not this rule. */
		if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
			(!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
			continue;

#undef IN6_ARE_ADDR_MASKEQUAL
		/* Interface check */
		if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
			struct ifnet *const iface = oif ? oif : rif;

			/* Backwards compatibility hack for "via" */
			if (!iface || !iface_match(iface,
			    &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
				continue;
		} else {
			/* Check receive interface */
			if ((f->fw_flg & IPV6_FW_F_IIFACE)
			    && (!rif || !iface_match(rif,
			      &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
				continue;
			/* Check outgoing interface */
			if ((f->fw_flg & IPV6_FW_F_OIFACE)
			    && (!oif || !iface_match(oif,
			      &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
				continue;
		}

		/* Check IP options */
		if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
			continue;

		/* Fragments */
		if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
			continue;

		/* Check protocol; if wildcard, match */
		if (f->fw_prot == IPPROTO_IPV6)
			goto got_match;

		/* If different, don't match */
		if (nxt != f->fw_prot)
			continue;

#define PULLUP_TO(len)	do {						\
			    if ((*m)->m_len < (len)			\
				&& (*m = m_pullup(*m, (len))) == 0) {	\
				    goto dropit;			\
			    }						\
			    *pip6 = ip6 = mtod(*m, struct ip6_hdr *);	\
			} while (0)

		/* Protocol specific checks */
		switch (nxt) {
		case IPPROTO_TCP:
		    {
			struct tcphdr *tcp6;

			if (offset == 1) {	/* cf. RFC 1858 */
				PULLUP_TO(off + 4); /* XXX ? */
				goto bogusfrag;
			}
			if (offset != 0) {
				/*
				 * TCP flags and ports aren't available in this
				 * packet -- if this rule specified either one,
				 * we consider the rule a non-match.
				 */
				if (f->fw_nports != 0 ||
				    f->fw_tcpf != f->fw_tcpnf)
					continue;

				break;
			}
			PULLUP_TO(off + 14);
			tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
			if (((f->fw_tcpf != f->fw_tcpnf) ||
			   (f->fw_ipflg & IPV6_FW_IF_TCPEST))  &&
			   !tcp6flg_match(tcp6, f))
				continue;
			src_port = ntohs(tcp6->th_sport);
			dst_port = ntohs(tcp6->th_dport);
			goto check_ports;
		    }

		case IPPROTO_UDP:
		    {
			struct udphdr *udp;

			if (offset != 0) {
				/*
				 * Port specification is unavailable -- if this
				 * rule specifies a port, we consider the rule
				 * a non-match.
				 */
				if (f->fw_nports != 0)
					continue;

				break;
			}
			PULLUP_TO(off + 4);
			udp = (struct udphdr *) ((caddr_t)ip6 + off);
			src_port = ntohs(udp->uh_sport);
			dst_port = ntohs(udp->uh_dport);
check_ports:
			if (!port_match6(&f->fw_pts[0],
			    IPV6_FW_GETNSRCP(f), src_port,
			    f->fw_flg & IPV6_FW_F_SRNG))
				continue;
			if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
			    IPV6_FW_GETNDSTP(f), dst_port,
			    f->fw_flg & IPV6_FW_F_DRNG))
				continue;
			break;
		    }

		case IPPROTO_ICMPV6:
		    {
			struct icmp6_hdr *icmp;

			if (offset != 0)	/* Type isn't valid */
				break;
			PULLUP_TO(off + 2);
			icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
			if (!icmp6type_match(icmp, f))
				continue;
			break;
		    }
#undef PULLUP_TO

bogusfrag:
			if (fw6_verbose)
				ip6fw_report(NULL, ip6, rif, oif, off, nxt);
			goto dropit;
		}

got_match:
#ifndef IP6FW_DIVERT_RESTART
		/* Ignore divert/tee rule if socket port is "ignport" */
		switch (f->fw_flg & IPV6_FW_F_COMMAND) {
		case IPV6_FW_F_DIVERT:
		case IPV6_FW_F_TEE:
			if (f->fw_divert_port == ignport)
				continue;       /* ignore this rule */
			break;
		}

#endif /* IP6FW_DIVERT_RESTART */
		/* Update statistics */
		f->fw_pcnt += 1;
		f->fw_bcnt += ntohs(ip6->ip6_plen);
		f->timestamp = time_second;

		/* Log to console if desired */
		if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
			ip6fw_report(f, ip6, rif, oif, off, nxt);

		/* Take appropriate action */
		switch (f->fw_flg & IPV6_FW_F_COMMAND) {
		case IPV6_FW_F_ACCEPT:
			return(0);
		case IPV6_FW_F_COUNT:
			continue;
		case IPV6_FW_F_DIVERT:
#ifdef IP6FW_DIVERT_RESTART
			*cookie = f->fw_number;
#else
			*cookie = htons(f->fw_divert_port);
#endif /* IP6FW_DIVERT_RESTART */
			return(f->fw_divert_port);
		case IPV6_FW_F_TEE:
			/*
			 * XXX someday tee packet here, but beware that you
			 * can't use m_copym() or m_copypacket() because
			 * the divert input routine modifies the mbuf
			 * (and these routines only increment reference
			 * counts in the case of mbuf clusters), so need
			 * to write custom routine.
			 */
			continue;
		case IPV6_FW_F_SKIPTO:
#ifdef DIAGNOSTIC
			while (chain->chain.le_next
			    && chain->chain.le_next->rule->fw_number
				< f->fw_skipto_rule)
#else
			while (chain->chain.le_next->rule->fw_number
			    < f->fw_skipto_rule)
#endif
				chain = chain->chain.le_next;
			continue;
		}

		/* Deny/reject this packet using this rule */
		rule = f;
		break;
	}

#ifdef DIAGNOSTIC
	/* Rule 65535 should always be there and should always match */
	if (!chain)
		panic("ip6_fw: chain");
#endif

	/*
	 * At this point, we're going to drop the packet.
	 * Send a reject notice if all of the following are true:
	 *
	 * - The packet matched a reject rule
	 * - The packet is not an ICMP packet, or is an ICMP query packet
	 * - The packet is not a multicast or broadcast packet
	 */
	if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
	    && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
	    && !((*m)->m_flags & (M_BCAST|M_MCAST))
	    && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
		switch (rule->fw_reject_code) {
		case IPV6_FW_REJECT_RST:
		  {
			struct tcphdr *const tcp =
				(struct tcphdr *) ((caddr_t)ip6 + off);
			struct {
				struct ip6_hdr ip6;
				struct tcphdr th;
			} ti;
			tcp_seq ack, seq;
			int flags;

			if (offset != 0 || (tcp->th_flags & TH_RST))
				break;

			ti.ip6 = *ip6;
			ti.th = *tcp;
			NTOHL(ti.th.th_seq);
			NTOHL(ti.th.th_ack);
			ti.ip6.ip6_nxt = IPPROTO_TCP;
			if (ti.th.th_flags & TH_ACK) {
				ack = 0;
				seq = ti.th.th_ack;
				flags = TH_RST;
			} else {
				ack = ti.th.th_seq;
				if (((*m)->m_flags & M_PKTHDR) != 0) {
					ack += (*m)->m_pkthdr.len - off
						- (ti.th.th_off << 2);
				} else if (ip6->ip6_plen) {
					ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
						- off - (ti.th.th_off << 2);
				} else {
					m_freem(*m);
					*m = 0;
					break;
				}
				seq = 0;
				flags = TH_RST|TH_ACK;
			}
			bcopy(&ti, ip6, sizeof(ti));
			m_freem(*m);
			*m = NULL;
			break;
		  }
		default:	/* Send an ICMP unreachable using code */
			if (oif)
				(*m)->m_pkthdr.rcvif = oif;
			icmp6_error(*m, ICMP6_DST_UNREACH,
			    rule->fw_reject_code, 0);
			*m = NULL;
			break;
		}
	}

dropit:
	/*
	 * Finally, drop the packet.
	 */
	if (*m) {
		m_freem(*m);
		*m = NULL;
	}
	return(0);
}

static int
add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
{
	struct ip6_fw *ftmp = 0;
	struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
	u_short nbr = 0;
	int s;

	fwc = malloc(sizeof *fwc, M_IP6FW, M_DONTWAIT);
	ftmp = malloc(sizeof *ftmp, M_IP6FW, M_DONTWAIT);
	if (!fwc || !ftmp) {
		dprintf(("%s malloc said no\n", err_prefix));
		if (fwc)  free(fwc, M_IP6FW);
		if (ftmp) free(ftmp, M_IP6FW);
		return (ENOSPC);
	}

	bcopy(frwl, ftmp, sizeof(struct ip6_fw));
	ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
	ftmp->fw_pcnt = 0L;
	ftmp->fw_bcnt = 0L;
	fwc->rule = ftmp;
	
	s = splnet();

	if (!chainptr->lh_first) {
		LIST_INSERT_HEAD(chainptr, fwc, chain);
		splx(s);
		return(0);
        } else if (ftmp->fw_number == (u_short)-1) {
		if (fwc)  free(fwc, M_IP6FW);
		if (ftmp) free(ftmp, M_IP6FW);
		splx(s);
		dprintf(("%s bad rule number\n", err_prefix));
		return (EINVAL);
        }

	/* If entry number is 0, find highest numbered rule and add 100 */
	if (ftmp->fw_number == 0) {
		for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
			if (fcp->rule->fw_number != (u_short)-1)
				nbr = fcp->rule->fw_number;
			else
				break;
		}
		if (nbr < (u_short)-1 - 100)
			nbr += 100;
		ftmp->fw_number = nbr;
	}

	/* Got a valid number; now insert it, keeping the list ordered */
	for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
		if (fcp->rule->fw_number > ftmp->fw_number) {
			if (fcpl) {
				LIST_INSERT_AFTER(fcpl, fwc, chain);
			} else {
				LIST_INSERT_HEAD(chainptr, fwc, chain);
			}
			break;
		} else {
			fcpl = fcp;
		}
	}

	splx(s);
	return (0);
}

static int
del_entry6(struct ip6_fw_head *chainptr, u_short number)
{
	struct ip6_fw_chain *fcp;
	int s;

	s = splnet();

	fcp = chainptr->lh_first;
	if (number != (u_short)-1) {
		for (; fcp; fcp = fcp->chain.le_next) {
			if (fcp->rule->fw_number == number) {
				LIST_REMOVE(fcp, chain);
				splx(s);
				free(fcp->rule, M_IP6FW);
				free(fcp, M_IP6FW);
				return 0;
			}
		}
	}

	splx(s);
	return (EINVAL);
}

static int
zero_entry6(struct mbuf *m)
{
	struct ip6_fw *frwl;
	struct ip6_fw_chain *fcp;
	int s;

	if (m && m->m_len != 0) {
		if (m->m_len != sizeof(struct ip6_fw))
			return(EINVAL);
		frwl = mtod(m, struct ip6_fw *);
	}
	else
		frwl = NULL;

	/*
	 *	It's possible to insert multiple chain entries with the
	 *	same number, so we don't stop after finding the first
	 *	match if zeroing a specific entry.
	 */
	s = splnet();
	for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
		if (!frwl || frwl->fw_number == fcp->rule->fw_number) {
			fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
			fcp->rule->timestamp = 0;
		}
	splx(s);

	if (fw6_verbose) {
		if (frwl)
			printf("ip6fw: Entry %d cleared.\n", frwl->fw_number);
		else
			printf("ip6fw: Accounting cleared.\n");
	}

	return(0);
}

static struct ip6_fw *
check_ip6fw_mbuf(struct mbuf *m)
{
	/* Check length */
	if (m->m_len != sizeof(struct ip6_fw)) {
		dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
		    sizeof(struct ip6_fw)));
		return (NULL);
	}
	return(check_ip6fw_struct(mtod(m, struct ip6_fw *)));
}

static struct ip6_fw *
check_ip6fw_struct(struct ip6_fw *frwl)
{
	/* Check for invalid flag bits */
	if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
		dprintf(("%s undefined flag bits set (flags=%x)\n",
		    err_prefix, frwl->fw_flg));
		return (NULL);
	}
	/* Must apply to incoming or outgoing (or both) */
	if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
		dprintf(("%s neither in nor out\n", err_prefix));
		return (NULL);
	}
	/* Empty interface name is no good */
	if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
	      && !*frwl->fw_in_if.fu_via_if.name)
	    || ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
	      && !*frwl->fw_out_if.fu_via_if.name)) {
		dprintf(("%s empty interface name\n", err_prefix));
		return (NULL);
	}
	/* Sanity check interface matching */
	if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
		;		/* allow "via" backwards compatibility */
	} else if ((frwl->fw_flg & IPV6_FW_F_IN)
	    && (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
		dprintf(("%s outgoing interface check on incoming\n",
		    err_prefix));
		return (NULL);
	}
	/* Sanity check port ranges */
	if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
		dprintf(("%s src range set but n_src_p=%d\n",
		    err_prefix, IPV6_FW_GETNSRCP(frwl)));
		return (NULL);
	}
	if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
		dprintf(("%s dst range set but n_dst_p=%d\n",
		    err_prefix, IPV6_FW_GETNDSTP(frwl)));
		return (NULL);
	}
	if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
		dprintf(("%s too many ports (%d+%d)\n",
		    err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
		return (NULL);
	}
	/*
	 *	Protocols other than TCP/UDP don't use port range
	 */
	if ((frwl->fw_prot != IPPROTO_TCP) &&
	    (frwl->fw_prot != IPPROTO_UDP) &&
	    (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
		dprintf(("%s port(s) specified for non TCP/UDP rule\n",
		    err_prefix));
		return(NULL);
	}

	/*
	 *	Rather than modify the entry to make such entries work,
	 *	we reject this rule and require user level utilities
	 *	to enforce whatever policy they deem appropriate.
	 */
	if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
		(frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
		(frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
		(frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
		(frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
		(frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
		(frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
		(frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
		dprintf(("%s rule never matches\n", err_prefix));
		return(NULL);
	}

	if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
		(frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
		if (frwl->fw_nports) {
			dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
			return(NULL);
		}
		if (frwl->fw_prot == IPPROTO_TCP &&
			frwl->fw_tcpf != frwl->fw_tcpnf) {
			dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
			return(NULL);
		}
	}

	/* Check command specific stuff */
	switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
	{
	case IPV6_FW_F_REJECT:
		if (frwl->fw_reject_code >= 0x100
		    && !(frwl->fw_prot == IPPROTO_TCP
		      && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
			dprintf(("%s unknown reject code\n", err_prefix));
			return(NULL);
		}
		break;
	case IPV6_FW_F_DIVERT:		/* Diverting to port zero is invalid */
	case IPV6_FW_F_TEE:
		if (frwl->fw_divert_port == 0) {
			dprintf(("%s can't divert to port 0\n", err_prefix));
			return (NULL);
		}
		break;
	case IPV6_FW_F_DENY:
	case IPV6_FW_F_ACCEPT:
	case IPV6_FW_F_COUNT:
	case IPV6_FW_F_SKIPTO:
		break;
	default:
		dprintf(("%s invalid command\n", err_prefix));
		return(NULL);
	}

	return frwl;
}

static int
ip6_fw_ctl(int stage, struct mbuf **mm)
{
	int error;
	struct mbuf *m;

	if (stage == IPV6_FW_GET) {
		struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
		*mm = m = m_get(M_TRYWAIT, MT_DATA); /* XXX */
		if (!m)
			return(ENOBUFS);
		if (sizeof *(fcp->rule) > MLEN) {
			MCLGET(m, M_TRYWAIT);
			if ((m->m_flags & M_EXT) == 0) {
				m_free(m);
				return(ENOBUFS);
			}
		}
		for (; fcp; fcp = fcp->chain.le_next) {
			memcpy(m->m_data, fcp->rule, sizeof *(fcp->rule));
			m->m_len = sizeof *(fcp->rule);
			m->m_next = m_get(M_TRYWAIT, MT_DATA); /* XXX */
			if (!m->m_next) {
				m_freem(*mm);
				return(ENOBUFS);
			}
			m = m->m_next;
			if (sizeof *(fcp->rule) > MLEN) {
				MCLGET(m, M_TRYWAIT);
				if ((m->m_flags & M_EXT) == 0) {
					m_freem(*mm);
					return(ENOBUFS);
				}
			}
			m->m_len = 0;
		}
		return (0);
	}
	m = *mm;
	/* only allow get calls if secure mode > 2 */
	if (securelevel > 2) {
		if (m) {
			(void)m_freem(m);
			*mm = 0;
		}
		return(EPERM);
	}
	if (stage == IPV6_FW_FLUSH) {
		while (ip6_fw_chain.lh_first != NULL &&
		    ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) {
			struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
			int s = splnet();
			LIST_REMOVE(ip6_fw_chain.lh_first, chain);
			splx(s);
			free(fcp->rule, M_IP6FW);
			free(fcp, M_IP6FW);
		}
		if (m) {
			(void)m_freem(m);
			*mm = 0;
		}
		return (0);
	}
	if (stage == IPV6_FW_ZERO) {
		error = zero_entry6(m);
		if (m) {
			(void)m_freem(m);
			*mm = 0;
		}
		return (error);
	}
	if (m == NULL) {
		printf("%s NULL mbuf ptr\n", err_prefix);
		return (EINVAL);
	}

	if (stage == IPV6_FW_ADD) {
		struct ip6_fw *frwl = check_ip6fw_mbuf(m);

		if (!frwl)
			error = EINVAL;
		else
			error = add_entry6(&ip6_fw_chain, frwl);
		if (m) {
			(void)m_freem(m);
			*mm = 0;
		}
		return error;
	}
	if (stage == IPV6_FW_DEL) {
		if (m->m_len != sizeof(struct ip6_fw)) {
			dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
			    sizeof(struct ip6_fw)));
			error = EINVAL;
		} else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) {
			dprintf(("%s can't delete rule 65535\n", err_prefix));
			error = EINVAL;
		} else
			error = del_entry6(&ip6_fw_chain,
			    mtod(m, struct ip6_fw *)->fw_number);
		if (m) {
			(void)m_freem(m);
			*mm = 0;
		}
		return error;
	}

	dprintf(("%s unknown request %d\n", err_prefix, stage));
	if (m) {
		(void)m_freem(m);
		*mm = 0;
	}
	return (EINVAL);
}

void
ip6_fw_init(void)
{
	struct ip6_fw default_rule;

	ip6_fw_chk_ptr = ip6_fw_chk;
	ip6_fw_ctl_ptr = ip6_fw_ctl;
	LIST_INIT(&ip6_fw_chain);

	bzero(&default_rule, sizeof default_rule);
	default_rule.fw_prot = IPPROTO_IPV6;
	default_rule.fw_number = (u_short)-1;
#ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
	default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
#else
	default_rule.fw_flg |= IPV6_FW_F_DENY;
#endif
	default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
	if (check_ip6fw_struct(&default_rule) == NULL ||
		add_entry6(&ip6_fw_chain, &default_rule))
		panic(__FUNCTION__);

	printf("IPv6 packet filtering initialized, ");
#ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
	printf("default to accept, ");
#endif
#ifndef IPV6FIREWALL_VERBOSE
	printf("logging disabled\n");
#else
	if (fw6_verbose_limit == 0)
		printf("unlimited logging\n");
	else
		printf("logging limited to %d packets/entry\n",
		    fw6_verbose_limit);
#endif
}

static ip6_fw_chk_t *old_chk_ptr;
static ip6_fw_ctl_t *old_ctl_ptr;

static int
ip6fw_modevent(module_t mod, int type, void *unused)
{
	int s;
	
	switch (type) {
	case MOD_LOAD:
		s = splnet();

		old_chk_ptr = ip6_fw_chk_ptr;
		old_ctl_ptr = ip6_fw_ctl_ptr;

		ip6_fw_init();
		splx(s);
		return 0;
	case MOD_UNLOAD:
		s = splnet();
		ip6_fw_chk_ptr =  old_chk_ptr;
		ip6_fw_ctl_ptr =  old_ctl_ptr;
		while (LIST_FIRST(&ip6_fw_chain) != NULL) {
			struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain);
			LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain);
			free(fcp->rule, M_IP6FW);
			free(fcp, M_IP6FW);
		}
	
		splx(s);
		printf("IPv6 firewall unloaded\n");
		return 0;
	default:
		break;
	}
	return 0;
}

static moduledata_t ip6fwmod = {
	"ip6fw",
	ip6fw_modevent,
	0
};
DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
OpenPOWER on IntegriCloud