xref: /freebsd/sys/netinet6/ip6_mroute.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (C) 1998 WIDE Project.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the project nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *	$KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
30  */
31 
32 /*-
33  * Copyright (c) 1989 Stephen Deering
34  * Copyright (c) 1992, 1993
35  *      The Regents of the University of California.  All rights reserved.
36  *
37  * This code is derived from software contributed to Berkeley by
38  * Stephen Deering of Stanford University.
39  *
40  * Redistribution and use in source and binary forms, with or without
41  * modification, are permitted provided that the following conditions
42  * are met:
43  * 1. Redistributions of source code must retain the above copyright
44  *    notice, this list of conditions and the following disclaimer.
45  * 2. Redistributions in binary form must reproduce the above copyright
46  *    notice, this list of conditions and the following disclaimer in the
47  *    documentation and/or other materials provided with the distribution.
48  * 4. Neither the name of the University nor the names of its contributors
49  *    may be used to endorse or promote products derived from this software
50  *    without specific prior written permission.
51  *
52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62  * SUCH DAMAGE.
63  *
64  *	@(#)ip_mroute.c	8.2 (Berkeley) 11/15/93
65  *	BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
66  */
67 
68 /*
69  * IP multicast forwarding procedures
70  *
71  * Written by David Waitzman, BBN Labs, August 1988.
72  * Modified by Steve Deering, Stanford, February 1989.
73  * Modified by Mark J. Steiglitz, Stanford, May, 1991
74  * Modified by Van Jacobson, LBL, January 1993
75  * Modified by Ajit Thyagarajan, PARC, August 1993
76  * Modified by Bill Fenner, PARC, April 1994
77  *
78  * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
79  */
80 
81 #include <sys/cdefs.h>
82 __FBSDID("$FreeBSD$");
83 
84 #include "opt_inet.h"
85 #include "opt_inet6.h"
86 
87 #include <sys/param.h>
88 #include <sys/callout.h>
89 #include <sys/errno.h>
90 #include <sys/kernel.h>
91 #include <sys/lock.h>
92 #include <sys/malloc.h>
93 #include <sys/mbuf.h>
94 #include <sys/protosw.h>
95 #include <sys/signalvar.h>
96 #include <sys/socket.h>
97 #include <sys/socketvar.h>
98 #include <sys/sockio.h>
99 #include <sys/sx.h>
100 #include <sys/sysctl.h>
101 #include <sys/syslog.h>
102 #include <sys/systm.h>
103 #include <sys/time.h>
104 
105 #include <net/if.h>
106 #include <net/if_types.h>
107 #include <net/raw_cb.h>
108 #include <net/route.h>
109 
110 #include <netinet/in.h>
111 #include <netinet/in_var.h>
112 #include <netinet/icmp6.h>
113 
114 #include <netinet/ip6.h>
115 #include <netinet6/ip6_var.h>
116 #include <netinet6/scope6_var.h>
117 #include <netinet6/nd6.h>
118 #include <netinet6/ip6_mroute.h>
119 #include <netinet6/ip6protosw.h>
120 #include <netinet6/pim6.h>
121 #include <netinet6/pim6_var.h>
122 
123 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
124 
125 /* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */
126 #define M_HASCL(m) ((m)->m_flags & M_EXT)
127 
128 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
129 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
130 
131 static int set_pim6(int *);
132 static int socket_send __P((struct socket *, struct mbuf *,
133 	    struct sockaddr_in6 *));
134 static int register_send __P((struct ip6_hdr *, struct mif6 *,
135 	    struct mbuf *));
136 
137 extern struct domain inet6domain;
138 
139 /* XXX: referenced from ip_mroute.c for dynamically loading this code. */
140 struct ip6protosw in6_pim_protosw = {
141 	.pr_type =		SOCK_RAW,
142 	.pr_domain =		&inet6domain,
143 	.pr_protocol =		IPPROTO_PIM,
144 	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_LASTHDR,
145 	.pr_input =		pim6_input,
146 	.pr_output =		rip6_output,
147 	.pr_ctloutput =		rip6_ctloutput,
148 	.pr_usrreqs =		&rip6_usrreqs
149 };
150 
151 static int ip6_mrouter_ver = 0;
152 
153 SYSCTL_DECL(_net_inet6);
154 SYSCTL_DECL(_net_inet6_ip6);
155 SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
156 
157 static struct mrt6stat mrt6stat;
158 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
159     &mrt6stat, mrt6stat,
160     "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
161 
162 #define NO_RTE_FOUND	0x1
163 #define RTE_FOUND	0x2
164 
165 static struct mf6c *mf6ctable[MF6CTBLSIZ];
166 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
167     &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
168     "Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
169     "netinet6/ip6_mroute.h)");
170 
171 static u_char n6expire[MF6CTBLSIZ];
172 
173 static struct mif6 mif6table[MAXMIFS];
174 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
175     &mif6table, sizeof(mif6table), "S,vif[MAXMIFS]",
176     "Multicast Interfaces (struct mif[MAXMIFS], netinet6/ip6_mroute.h)");
177 
178 #ifdef MRT6DEBUG
179 static u_int mrt6debug = 0;		/* debug level */
180 #define DEBUG_MFC	0x02
181 #define DEBUG_FORWARD	0x04
182 #define DEBUG_EXPIRE	0x08
183 #define DEBUG_XMIT	0x10
184 #define DEBUG_REG	0x20
185 #define DEBUG_PIM	0x40
186 #endif
187 
188 static void	expire_upcalls(void *);
189 #define	EXPIRE_TIMEOUT	(hz / 4)	/* 4x / second */
190 #define	UPCALL_EXPIRE	6		/* number of timeouts */
191 
192 #ifdef INET
193 #ifdef MROUTING
194 extern struct socket *ip_mrouter;
195 #endif
196 #endif
197 
198 /*
199  * 'Interfaces' associated with decapsulator (so we can tell
200  * packets that went through it from ones that get reflected
201  * by a broken gateway).  Different from IPv4 register_if,
202  * these interfaces are linked into the system ifnet list,
203  * because per-interface IPv6 statistics are maintained in
204  * ifp->if_afdata.  But it does not have any routes point
205  * to them.  I.e., packets can't be sent this way.  They
206  * only exist as a placeholder for multicast source
207  * verification.
208  */
209 static struct ifnet *multicast_register_if6;
210 
211 #define ENCAP_HOPS 64
212 
213 /*
214  * Private variables.
215  */
216 static mifi_t nummifs = 0;
217 static mifi_t reg_mif_num = (mifi_t)-1;
218 
219 static struct pim6stat pim6stat;
220 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
221     &pim6stat, pim6stat,
222     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
223 
224 static int pim6;
225 
226 /*
227  * Hash function for a source, group entry
228  */
229 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
230 				   (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
231 				   (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
232 				   (g).s6_addr32[2] ^ (g).s6_addr32[3])
233 
234 /*
235  * Find a route for a given origin IPv6 address and Multicast group address.
236  */
237 #define MF6CFIND(o, g, rt) do { \
238 	struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
239 	rt = NULL; \
240 	mrt6stat.mrt6s_mfc_lookups++; \
241 	while (_rt) { \
242 		if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
243 		    IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
244 		    (_rt->mf6c_stall == NULL)) { \
245 			rt = _rt; \
246 			break; \
247 		} \
248 		_rt = _rt->mf6c_next; \
249 	} \
250 	if (rt == NULL) { \
251 		mrt6stat.mrt6s_mfc_misses++; \
252 	} \
253 } while (/*CONSTCOND*/ 0)
254 
255 /*
256  * Macros to compute elapsed time efficiently
257  * Borrowed from Van Jacobson's scheduling code
258  * XXX: replace with timersub() ?
259  */
260 #define TV_DELTA(a, b, delta) do { \
261 	    int xxs; \
262 		\
263 	    delta = (a).tv_usec - (b).tv_usec; \
264 	    if ((xxs = (a).tv_sec - (b).tv_sec)) { \
265 	       switch (xxs) { \
266 		      case 2: \
267 			  delta += 1000000; \
268 			      /* FALLTHROUGH */ \
269 		      case 1: \
270 			  delta += 1000000; \
271 			  break; \
272 		      default: \
273 			  delta += (1000000 * xxs); \
274 	       } \
275 	    } \
276 } while (/*CONSTCOND*/ 0)
277 
278 /* XXX: replace with timercmp(a, b, <) ? */
279 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
280 	      (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
281 
282 #ifdef UPCALL_TIMING
283 #define UPCALL_MAX	50
284 static u_long upcall_data[UPCALL_MAX + 1];
285 static void collate();
286 #endif /* UPCALL_TIMING */
287 
288 static int get_sg_cnt(struct sioc_sg_req6 *);
289 static int get_mif6_cnt(struct sioc_mif_req6 *);
290 static int ip6_mrouter_init(struct socket *, int, int);
291 static int add_m6if(struct mif6ctl *);
292 static int del_m6if(mifi_t *);
293 static int add_m6fc(struct mf6cctl *);
294 static int del_m6fc(struct mf6cctl *);
295 
296 static struct callout expire_upcalls_ch;
297 
298 int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m);
299 int X_ip6_mrouter_done(void);
300 int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt);
301 int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt);
302 int X_mrt6_ioctl(int cmd, caddr_t data);
303 
304 /*
305  * Handle MRT setsockopt commands to modify the multicast routing tables.
306  */
307 int
308 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
309 {
310 	int error = 0;
311 	int optval;
312 	struct mif6ctl mifc;
313 	struct mf6cctl mfcc;
314 	mifi_t mifi;
315 
316 	if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)
317 		return (EACCES);
318 
319 	switch (sopt->sopt_name) {
320 	case MRT6_INIT:
321 #ifdef MRT6_OINIT
322 	case MRT6_OINIT:
323 #endif
324 		error = sooptcopyin(sopt, &optval, sizeof(optval),
325 		    sizeof(optval));
326 		if (error)
327 			break;
328 		error = ip6_mrouter_init(so, optval, sopt->sopt_name);
329 		break;
330 	case MRT6_DONE:
331 		error = X_ip6_mrouter_done();
332 		break;
333 	case MRT6_ADD_MIF:
334 		error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
335 		if (error)
336 			break;
337 		error = add_m6if(&mifc);
338 		break;
339 	case MRT6_ADD_MFC:
340 		error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
341 		if (error)
342 			break;
343 		error = add_m6fc(&mfcc);
344 		break;
345 	case MRT6_DEL_MFC:
346 		error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
347 		if (error)
348 			break;
349 		error = del_m6fc(&mfcc);
350 		break;
351 	case MRT6_DEL_MIF:
352 		error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
353 		if (error)
354 			break;
355 		error = del_m6if(&mifi);
356 		break;
357 	case MRT6_PIM:
358 		error = sooptcopyin(sopt, &optval, sizeof(optval),
359 		    sizeof(optval));
360 		if (error)
361 			break;
362 		error = set_pim6(&optval);
363 		break;
364 	default:
365 		error = EOPNOTSUPP;
366 		break;
367 	}
368 
369 	return (error);
370 }
371 
372 /*
373  * Handle MRT getsockopt commands
374  */
375 int
376 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
377 {
378 	int error = 0;
379 
380 	if (so != ip6_mrouter)
381 		return (EACCES);
382 
383 	switch (sopt->sopt_name) {
384 		case MRT6_PIM:
385 			error = sooptcopyout(sopt, &pim6, sizeof(pim6));
386 			break;
387 	}
388 	return (error);
389 }
390 
391 /*
392  * Handle ioctl commands to obtain information from the cache
393  */
394 int
395 X_mrt6_ioctl(int cmd, caddr_t data)
396 {
397 	switch (cmd) {
398 	case SIOCGETSGCNT_IN6:
399 		return (get_sg_cnt((struct sioc_sg_req6 *)data));
400 	case SIOCGETMIFCNT_IN6:
401 		return (get_mif6_cnt((struct sioc_mif_req6 *)data));
402 	default:
403 		return (EINVAL);
404 	}
405 }
406 
407 /*
408  * returns the packet, byte, rpf-failure count for the source group provided
409  */
410 static int
411 get_sg_cnt(struct sioc_sg_req6 *req)
412 {
413 	struct mf6c *rt;
414 	int s;
415 
416 	s = splnet();
417 	MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
418 	splx(s);
419 	if (rt != NULL) {
420 		req->pktcnt = rt->mf6c_pkt_cnt;
421 		req->bytecnt = rt->mf6c_byte_cnt;
422 		req->wrong_if = rt->mf6c_wrong_if;
423 	} else
424 		return (ESRCH);
425 #if 0
426 		req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
427 #endif
428 
429 	return (0);
430 }
431 
432 /*
433  * returns the input and output packet and byte counts on the mif provided
434  */
435 static int
436 get_mif6_cnt(struct sioc_mif_req6 *req)
437 {
438 	mifi_t mifi = req->mifi;
439 
440 	if (mifi >= nummifs)
441 		return (EINVAL);
442 
443 	req->icount = mif6table[mifi].m6_pkt_in;
444 	req->ocount = mif6table[mifi].m6_pkt_out;
445 	req->ibytes = mif6table[mifi].m6_bytes_in;
446 	req->obytes = mif6table[mifi].m6_bytes_out;
447 
448 	return (0);
449 }
450 
451 static int
452 set_pim6(int *i)
453 {
454 	if ((*i != 1) && (*i != 0))
455 		return (EINVAL);
456 
457 	pim6 = *i;
458 
459 	return (0);
460 }
461 
462 /*
463  * Enable multicast routing
464  */
465 static int
466 ip6_mrouter_init(struct socket *so, int v, int cmd)
467 {
468 #ifdef MRT6DEBUG
469 	if (mrt6debug)
470 		log(LOG_DEBUG,
471 		    "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
472 		    so->so_type, so->so_proto->pr_protocol);
473 #endif
474 
475 	if (so->so_type != SOCK_RAW ||
476 	    so->so_proto->pr_protocol != IPPROTO_ICMPV6)
477 		return (EOPNOTSUPP);
478 
479 	if (v != 1)
480 		return (ENOPROTOOPT);
481 
482 	if (ip6_mrouter != NULL)
483 		return (EADDRINUSE);
484 
485 	ip6_mrouter = so;
486 	ip6_mrouter_ver = cmd;
487 
488 	bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
489 	bzero((caddr_t)n6expire, sizeof(n6expire));
490 
491 	pim6 = 0;/* used for stubbing out/in pim stuff */
492 
493 	callout_init(&expire_upcalls_ch, 0);
494 	callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
495 	    expire_upcalls, NULL);
496 
497 #ifdef MRT6DEBUG
498 	if (mrt6debug)
499 		log(LOG_DEBUG, "ip6_mrouter_init\n");
500 #endif
501 
502 	return (0);
503 }
504 
505 /*
506  * Disable multicast routing
507  */
508 int
509 X_ip6_mrouter_done(void)
510 {
511 	mifi_t mifi;
512 	int i;
513 	struct mf6c *rt;
514 	struct rtdetq *rte;
515 	int s;
516 
517 	s = splnet();
518 
519 	/*
520 	 * For each phyint in use, disable promiscuous reception of all IPv6
521 	 * multicasts.
522 	 */
523 #ifdef INET
524 #ifdef MROUTING
525 	/*
526 	 * If there is still IPv4 multicast routing daemon,
527 	 * we remain interfaces to receive all muliticasted packets.
528 	 * XXX: there may be an interface in which the IPv4 multicast
529 	 * daemon is not interested...
530 	 */
531 	if (!ip_mrouter)
532 #endif
533 #endif
534 	{
535 		for (mifi = 0; mifi < nummifs; mifi++) {
536 			if (mif6table[mifi].m6_ifp &&
537 			    !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
538 				if_allmulti(mif6table[mifi].m6_ifp, 0);
539 			}
540 		}
541 	}
542 	bzero((caddr_t)mif6table, sizeof(mif6table));
543 	nummifs = 0;
544 
545 	pim6 = 0; /* used to stub out/in pim specific code */
546 
547 	callout_stop(&expire_upcalls_ch);
548 
549 	/*
550 	 * Free all multicast forwarding cache entries.
551 	 */
552 	for (i = 0; i < MF6CTBLSIZ; i++) {
553 		rt = mf6ctable[i];
554 		while (rt) {
555 			struct mf6c *frt;
556 
557 			for (rte = rt->mf6c_stall; rte != NULL; ) {
558 				struct rtdetq *n = rte->next;
559 
560 				m_free(rte->m);
561 				free(rte, M_MRTABLE6);
562 				rte = n;
563 			}
564 			frt = rt;
565 			rt = rt->mf6c_next;
566 			free(frt, M_MRTABLE6);
567 		}
568 	}
569 
570 	bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
571 
572 	/*
573 	 * Reset register interface
574 	 */
575 	if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
576 		if_detach(multicast_register_if6);
577 		if_free(multicast_register_if6);
578 		reg_mif_num = (mifi_t)-1;
579 		multicast_register_if6 = NULL;
580 	}
581 
582 	ip6_mrouter = NULL;
583 	ip6_mrouter_ver = 0;
584 
585 	splx(s);
586 
587 #ifdef MRT6DEBUG
588 	if (mrt6debug)
589 		log(LOG_DEBUG, "ip6_mrouter_done\n");
590 #endif
591 
592 	return (0);
593 }
594 
595 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
596 
597 /*
598  * Add a mif to the mif table
599  */
600 static int
601 add_m6if(struct mif6ctl *mifcp)
602 {
603 	struct mif6 *mifp;
604 	struct ifnet *ifp;
605 	int error, s;
606 
607 	if (mifcp->mif6c_mifi >= MAXMIFS)
608 		return (EINVAL);
609 	mifp = mif6table + mifcp->mif6c_mifi;
610 	if (mifp->m6_ifp)
611 		return (EADDRINUSE); /* XXX: is it appropriate? */
612 	if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
613 		return (ENXIO);
614 	ifp = ifnet_byindex(mifcp->mif6c_pifi);
615 
616 	if (mifcp->mif6c_flags & MIFF_REGISTER) {
617 		if (reg_mif_num == (mifi_t)-1) {
618 			ifp = if_alloc(IFT_OTHER);
619 
620 			if_initname(ifp, "register_mif", 0);
621 			ifp->if_flags |= IFF_LOOPBACK;
622 			if_attach(ifp);
623 			multicast_register_if6 = ifp;
624 			reg_mif_num = mifcp->mif6c_mifi;
625 			/*
626 			 * it is impossible to guess the ifindex of the
627 			 * register interface.  So mif6c_pifi is automatically
628 			 * calculated.
629 			 */
630 			mifcp->mif6c_pifi = ifp->if_index;
631 		} else {
632 			ifp = multicast_register_if6;
633 		}
634 
635 	} /* if REGISTER */
636 	else {
637 		/* Make sure the interface supports multicast */
638 		if ((ifp->if_flags & IFF_MULTICAST) == 0)
639 			return (EOPNOTSUPP);
640 
641 		s = splnet();
642 		error = if_allmulti(ifp, 1);
643 		splx(s);
644 		if (error)
645 			return (error);
646 	}
647 
648 	s = splnet();
649 	mifp->m6_flags     = mifcp->mif6c_flags;
650 	mifp->m6_ifp       = ifp;
651 
652 	/* initialize per mif pkt counters */
653 	mifp->m6_pkt_in    = 0;
654 	mifp->m6_pkt_out   = 0;
655 	mifp->m6_bytes_in  = 0;
656 	mifp->m6_bytes_out = 0;
657 	splx(s);
658 
659 	/* Adjust nummifs up if the mifi is higher than nummifs */
660 	if (nummifs <= mifcp->mif6c_mifi)
661 		nummifs = mifcp->mif6c_mifi + 1;
662 
663 #ifdef MRT6DEBUG
664 	if (mrt6debug)
665 		log(LOG_DEBUG,
666 		    "add_mif #%d, phyint %s\n",
667 		    mifcp->mif6c_mifi,
668 		    ifp->if_xname);
669 #endif
670 
671 	return (0);
672 }
673 
674 /*
675  * Delete a mif from the mif table
676  */
677 static int
678 del_m6if(mifi_t *mifip)
679 {
680 	struct mif6 *mifp = mif6table + *mifip;
681 	mifi_t mifi;
682 	struct ifnet *ifp;
683 	int s;
684 
685 	if (*mifip >= nummifs)
686 		return (EINVAL);
687 	if (mifp->m6_ifp == NULL)
688 		return (EINVAL);
689 
690 	s = splnet();
691 
692 	if (!(mifp->m6_flags & MIFF_REGISTER)) {
693 		/*
694 		 * XXX: what if there is yet IPv4 multicast daemon
695 		 *      using the interface?
696 		 */
697 		ifp = mifp->m6_ifp;
698 
699 		if_allmulti(ifp, 0);
700 	} else {
701 		if (reg_mif_num != (mifi_t)-1 &&
702 		    multicast_register_if6 != NULL) {
703 			if_detach(multicast_register_if6);
704 			if_free(multicast_register_if6);
705 			reg_mif_num = (mifi_t)-1;
706 			multicast_register_if6 = NULL;
707 		}
708 	}
709 
710 	bzero((caddr_t)mifp, sizeof(*mifp));
711 
712 	/* Adjust nummifs down */
713 	for (mifi = nummifs; mifi > 0; mifi--)
714 		if (mif6table[mifi - 1].m6_ifp)
715 			break;
716 	nummifs = mifi;
717 
718 	splx(s);
719 
720 #ifdef MRT6DEBUG
721 	if (mrt6debug)
722 		log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
723 #endif
724 
725 	return (0);
726 }
727 
728 /*
729  * Add an mfc entry
730  */
731 static int
732 add_m6fc(struct mf6cctl *mfccp)
733 {
734 	struct mf6c *rt;
735 	u_long hash;
736 	struct rtdetq *rte;
737 	u_short nstl;
738 	int s;
739 	char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
740 
741 	MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
742 		 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
743 
744 	/* If an entry already exists, just update the fields */
745 	if (rt) {
746 #ifdef MRT6DEBUG
747 		if (mrt6debug & DEBUG_MFC) {
748 		    log(LOG_DEBUG,
749 			"add_m6fc no upcall h %d o %s g %s p %x\n",
750 			ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
751 			ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
752 			mfccp->mf6cc_parent);
753 		}
754 #endif
755 
756 		s = splnet();
757 		rt->mf6c_parent = mfccp->mf6cc_parent;
758 		rt->mf6c_ifset = mfccp->mf6cc_ifset;
759 		splx(s);
760 		return (0);
761 	}
762 
763 	/*
764 	 * Find the entry for which the upcall was made and update
765 	 */
766 	s = splnet();
767 	hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
768 			mfccp->mf6cc_mcastgrp.sin6_addr);
769 	for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
770 		if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
771 				       &mfccp->mf6cc_origin.sin6_addr) &&
772 		    IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
773 				       &mfccp->mf6cc_mcastgrp.sin6_addr) &&
774 		    (rt->mf6c_stall != NULL)) {
775 
776 			if (nstl++)
777 				log(LOG_ERR,
778 				    "add_m6fc: %s o %s g %s p %x dbx %p\n",
779 				    "multiple kernel entries",
780 				    ip6_sprintf(ip6bufo,
781 					    &mfccp->mf6cc_origin.sin6_addr),
782 				    ip6_sprintf(ip6bufg,
783 					    &mfccp->mf6cc_mcastgrp.sin6_addr),
784 				    mfccp->mf6cc_parent, rt->mf6c_stall);
785 
786 #ifdef MRT6DEBUG
787 			if (mrt6debug & DEBUG_MFC)
788 				log(LOG_DEBUG,
789 				    "add_m6fc o %s g %s p %x dbg %x\n",
790 				    ip6_sprintf(ip6bufo,
791 					    &mfccp->mf6cc_origin.sin6_addr),
792 				    ip6_sprintf(ip6bufg,
793 					    &mfccp->mf6cc_mcastgrp.sin6_addr),
794 				    mfccp->mf6cc_parent, rt->mf6c_stall);
795 #endif
796 
797 			rt->mf6c_origin     = mfccp->mf6cc_origin;
798 			rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
799 			rt->mf6c_parent     = mfccp->mf6cc_parent;
800 			rt->mf6c_ifset	    = mfccp->mf6cc_ifset;
801 			/* initialize pkt counters per src-grp */
802 			rt->mf6c_pkt_cnt    = 0;
803 			rt->mf6c_byte_cnt   = 0;
804 			rt->mf6c_wrong_if   = 0;
805 
806 			rt->mf6c_expire = 0;	/* Don't clean this guy up */
807 			n6expire[hash]--;
808 
809 			/* free packets Qed at the end of this entry */
810 			for (rte = rt->mf6c_stall; rte != NULL; ) {
811 				struct rtdetq *n = rte->next;
812 				ip6_mdq(rte->m, rte->ifp, rt);
813 				m_freem(rte->m);
814 #ifdef UPCALL_TIMING
815 				collate(&(rte->t));
816 #endif /* UPCALL_TIMING */
817 				free(rte, M_MRTABLE6);
818 				rte = n;
819 			}
820 			rt->mf6c_stall = NULL;
821 		}
822 	}
823 
824 	/*
825 	 * It is possible that an entry is being inserted without an upcall
826 	 */
827 	if (nstl == 0) {
828 #ifdef MRT6DEBUG
829 		if (mrt6debug & DEBUG_MFC)
830 		    log(LOG_DEBUG,
831 			"add_mfc no upcall h %d o %s g %s p %x\n",
832 			hash,
833 			ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
834 			ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
835 			mfccp->mf6cc_parent);
836 #endif
837 
838 		for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
839 
840 			if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
841 					       &mfccp->mf6cc_origin.sin6_addr)&&
842 			    IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
843 					       &mfccp->mf6cc_mcastgrp.sin6_addr)) {
844 
845 				rt->mf6c_origin     = mfccp->mf6cc_origin;
846 				rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
847 				rt->mf6c_parent     = mfccp->mf6cc_parent;
848 				rt->mf6c_ifset	    = mfccp->mf6cc_ifset;
849 				/* initialize pkt counters per src-grp */
850 				rt->mf6c_pkt_cnt    = 0;
851 				rt->mf6c_byte_cnt   = 0;
852 				rt->mf6c_wrong_if   = 0;
853 
854 				if (rt->mf6c_expire)
855 					n6expire[hash]--;
856 				rt->mf6c_expire	   = 0;
857 			}
858 		}
859 		if (rt == NULL) {
860 			/* no upcall, so make a new entry */
861 			rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
862 						  M_NOWAIT);
863 			if (rt == NULL) {
864 				splx(s);
865 				return (ENOBUFS);
866 			}
867 
868 			/* insert new entry at head of hash chain */
869 			rt->mf6c_origin     = mfccp->mf6cc_origin;
870 			rt->mf6c_mcastgrp   = mfccp->mf6cc_mcastgrp;
871 			rt->mf6c_parent     = mfccp->mf6cc_parent;
872 			rt->mf6c_ifset	    = mfccp->mf6cc_ifset;
873 			/* initialize pkt counters per src-grp */
874 			rt->mf6c_pkt_cnt    = 0;
875 			rt->mf6c_byte_cnt   = 0;
876 			rt->mf6c_wrong_if   = 0;
877 			rt->mf6c_expire     = 0;
878 			rt->mf6c_stall = NULL;
879 
880 			/* link into table */
881 			rt->mf6c_next  = mf6ctable[hash];
882 			mf6ctable[hash] = rt;
883 		}
884 	}
885 	splx(s);
886 	return (0);
887 }
888 
889 #ifdef UPCALL_TIMING
890 /*
891  * collect delay statistics on the upcalls
892  */
893 static void
894 collate(struct timeval *t)
895 {
896 	u_long d;
897 	struct timeval tp;
898 	u_long delta;
899 
900 	GET_TIME(tp);
901 
902 	if (TV_LT(*t, tp))
903 	{
904 		TV_DELTA(tp, *t, delta);
905 
906 		d = delta >> 10;
907 		if (d > UPCALL_MAX)
908 			d = UPCALL_MAX;
909 
910 		++upcall_data[d];
911 	}
912 }
913 #endif /* UPCALL_TIMING */
914 
915 /*
916  * Delete an mfc entry
917  */
918 static int
919 del_m6fc(struct mf6cctl *mfccp)
920 {
921 	struct sockaddr_in6	origin;
922 	struct sockaddr_in6	mcastgrp;
923 	struct mf6c		*rt;
924 	struct mf6c		**nptr;
925 	u_long		hash;
926 	int s;
927 
928 	origin = mfccp->mf6cc_origin;
929 	mcastgrp = mfccp->mf6cc_mcastgrp;
930 	hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
931 
932 #ifdef MRT6DEBUG
933 	if (mrt6debug & DEBUG_MFC) {
934 		char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
935 		log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
936 		    ip6_sprintf(ip6bufo, &origin.sin6_addr),
937 		    ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
938 	}
939 #endif
940 
941 	s = splnet();
942 
943 	nptr = &mf6ctable[hash];
944 	while ((rt = *nptr) != NULL) {
945 		if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
946 				       &rt->mf6c_origin.sin6_addr) &&
947 		    IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
948 				       &rt->mf6c_mcastgrp.sin6_addr) &&
949 		    rt->mf6c_stall == NULL)
950 			break;
951 
952 		nptr = &rt->mf6c_next;
953 	}
954 	if (rt == NULL) {
955 		splx(s);
956 		return (EADDRNOTAVAIL);
957 	}
958 
959 	*nptr = rt->mf6c_next;
960 	free(rt, M_MRTABLE6);
961 
962 	splx(s);
963 
964 	return (0);
965 }
966 
967 static int
968 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
969 {
970 
971 	if (s) {
972 		if (sbappendaddr(&s->so_rcv,
973 				 (struct sockaddr *)src,
974 				 mm, (struct mbuf *)0) != 0) {
975 			sorwakeup(s);
976 			return (0);
977 		}
978 	}
979 	m_freem(mm);
980 	return (-1);
981 }
982 
983 /*
984  * IPv6 multicast forwarding function. This function assumes that the packet
985  * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
986  * pointed to by "ifp", and the packet is to be relayed to other networks
987  * that have members of the packet's destination IPv6 multicast group.
988  *
989  * The packet is returned unscathed to the caller, unless it is
990  * erroneous, in which case a non-zero return value tells the caller to
991  * discard it.
992  *
993  * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
994  * this function is called in the originating context (i.e., not when
995  * forwarding a packet from other node).  ip6_output(), which is currently the
996  * only function that calls this function is called in the originating context,
997  * explicitly ensures this condition.  It is caller's responsibility to ensure
998  * that if this function is called from somewhere else in the originating
999  * context in the future.
1000  */
1001 int
1002 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1003 {
1004 	struct mf6c *rt;
1005 	struct mif6 *mifp;
1006 	struct mbuf *mm;
1007 	int s;
1008 	mifi_t mifi;
1009 	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1010 
1011 #ifdef MRT6DEBUG
1012 	if (mrt6debug & DEBUG_FORWARD)
1013 		log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
1014 		    ip6_sprintf(ip6bufs, &ip6->ip6_src),
1015 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1016 		    ifp->if_index);
1017 #endif
1018 
1019 	/*
1020 	 * Don't forward a packet with Hop limit of zero or one,
1021 	 * or a packet destined to a local-only group.
1022 	 */
1023 	if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1024 	    IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1025 		return (0);
1026 	ip6->ip6_hlim--;
1027 
1028 	/*
1029 	 * Source address check: do not forward packets with unspecified
1030 	 * source. It was discussed in July 2000, on ipngwg mailing list.
1031 	 * This is rather more serious than unicast cases, because some
1032 	 * MLD packets can be sent with the unspecified source address
1033 	 * (although such packets must normally set 1 to the hop limit field).
1034 	 */
1035 	if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1036 		ip6stat.ip6s_cantforward++;
1037 		if (ip6_log_time + ip6_log_interval < time_second) {
1038 			ip6_log_time = time_second;
1039 			log(LOG_DEBUG,
1040 			    "cannot forward "
1041 			    "from %s to %s nxt %d received on %s\n",
1042 			    ip6_sprintf(ip6bufs, &ip6->ip6_src),
1043 			    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1044 			    ip6->ip6_nxt,
1045 			    if_name(m->m_pkthdr.rcvif));
1046 		}
1047 		return (0);
1048 	}
1049 
1050 	/*
1051 	 * Determine forwarding mifs from the forwarding cache table
1052 	 */
1053 	s = splnet();
1054 	MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1055 
1056 	/* Entry exists, so forward if necessary */
1057 	if (rt) {
1058 		splx(s);
1059 		return (ip6_mdq(m, ifp, rt));
1060 	} else {
1061 		/*
1062 		 * If we don't have a route for packet's origin,
1063 		 * Make a copy of the packet &
1064 		 * send message to routing daemon
1065 		 */
1066 
1067 		struct mbuf *mb0;
1068 		struct rtdetq *rte;
1069 		u_long hash;
1070 /*		int i, npkts;*/
1071 #ifdef UPCALL_TIMING
1072 		struct timeval tp;
1073 
1074 		GET_TIME(tp);
1075 #endif /* UPCALL_TIMING */
1076 
1077 		mrt6stat.mrt6s_no_route++;
1078 #ifdef MRT6DEBUG
1079 		if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
1080 			log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
1081 			    ip6_sprintf(ip6bufs, &ip6->ip6_src),
1082 			    ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1083 #endif
1084 
1085 		/*
1086 		 * Allocate mbufs early so that we don't do extra work if we
1087 		 * are just going to fail anyway.
1088 		 */
1089 		rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6,
1090 					      M_NOWAIT);
1091 		if (rte == NULL) {
1092 			splx(s);
1093 			return (ENOBUFS);
1094 		}
1095 		mb0 = m_copy(m, 0, M_COPYALL);
1096 		/*
1097 		 * Pullup packet header if needed before storing it,
1098 		 * as other references may modify it in the meantime.
1099 		 */
1100 		if (mb0 &&
1101 		    (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1102 			mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1103 		if (mb0 == NULL) {
1104 			free(rte, M_MRTABLE6);
1105 			splx(s);
1106 			return (ENOBUFS);
1107 		}
1108 
1109 		/* is there an upcall waiting for this packet? */
1110 		hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1111 		for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1112 			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1113 					       &rt->mf6c_origin.sin6_addr) &&
1114 			    IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1115 					       &rt->mf6c_mcastgrp.sin6_addr) &&
1116 			    (rt->mf6c_stall != NULL))
1117 				break;
1118 		}
1119 
1120 		if (rt == NULL) {
1121 			struct mrt6msg *im;
1122 #ifdef MRT6_OINIT
1123 			struct omrt6msg *oim;
1124 #endif
1125 
1126 			/* no upcall, so make a new entry */
1127 			rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
1128 						  M_NOWAIT);
1129 			if (rt == NULL) {
1130 				free(rte, M_MRTABLE6);
1131 				m_freem(mb0);
1132 				splx(s);
1133 				return (ENOBUFS);
1134 			}
1135 			/*
1136 			 * Make a copy of the header to send to the user
1137 			 * level process
1138 			 */
1139 			mm = m_copy(mb0, 0, sizeof(struct ip6_hdr));
1140 
1141 			if (mm == NULL) {
1142 				free(rte, M_MRTABLE6);
1143 				m_freem(mb0);
1144 				free(rt, M_MRTABLE6);
1145 				splx(s);
1146 				return (ENOBUFS);
1147 			}
1148 
1149 			/*
1150 			 * Send message to routing daemon
1151 			 */
1152 			sin6.sin6_addr = ip6->ip6_src;
1153 
1154 			im = NULL;
1155 #ifdef MRT6_OINIT
1156 			oim = NULL;
1157 #endif
1158 			switch (ip6_mrouter_ver) {
1159 #ifdef MRT6_OINIT
1160 			case MRT6_OINIT:
1161 				oim = mtod(mm, struct omrt6msg *);
1162 				oim->im6_msgtype = MRT6MSG_NOCACHE;
1163 				oim->im6_mbz = 0;
1164 				break;
1165 #endif
1166 			case MRT6_INIT:
1167 				im = mtod(mm, struct mrt6msg *);
1168 				im->im6_msgtype = MRT6MSG_NOCACHE;
1169 				im->im6_mbz = 0;
1170 				break;
1171 			default:
1172 				free(rte, M_MRTABLE6);
1173 				m_freem(mb0);
1174 				free(rt, M_MRTABLE6);
1175 				splx(s);
1176 				return (EINVAL);
1177 			}
1178 
1179 #ifdef MRT6DEBUG
1180 			if (mrt6debug & DEBUG_FORWARD)
1181 				log(LOG_DEBUG,
1182 				    "getting the iif info in the kernel\n");
1183 #endif
1184 
1185 			for (mifp = mif6table, mifi = 0;
1186 			     mifi < nummifs && mifp->m6_ifp != ifp;
1187 			     mifp++, mifi++)
1188 				;
1189 
1190 			switch (ip6_mrouter_ver) {
1191 #ifdef MRT6_OINIT
1192 			case MRT6_OINIT:
1193 				oim->im6_mif = mifi;
1194 				break;
1195 #endif
1196 			case MRT6_INIT:
1197 				im->im6_mif = mifi;
1198 				break;
1199 			}
1200 
1201 			if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1202 				log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1203 				    "socket queue full\n");
1204 				mrt6stat.mrt6s_upq_sockfull++;
1205 				free(rte, M_MRTABLE6);
1206 				m_freem(mb0);
1207 				free(rt, M_MRTABLE6);
1208 				splx(s);
1209 				return (ENOBUFS);
1210 			}
1211 
1212 			mrt6stat.mrt6s_upcalls++;
1213 
1214 			/* insert new entry at head of hash chain */
1215 			bzero(rt, sizeof(*rt));
1216 			rt->mf6c_origin.sin6_family = AF_INET6;
1217 			rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1218 			rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1219 			rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1220 			rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1221 			rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1222 			rt->mf6c_expire = UPCALL_EXPIRE;
1223 			n6expire[hash]++;
1224 			rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1225 
1226 			/* link into table */
1227 			rt->mf6c_next  = mf6ctable[hash];
1228 			mf6ctable[hash] = rt;
1229 			/* Add this entry to the end of the queue */
1230 			rt->mf6c_stall = rte;
1231 		} else {
1232 			/* determine if q has overflowed */
1233 			struct rtdetq **p;
1234 			int npkts = 0;
1235 
1236 			for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1237 				if (++npkts > MAX_UPQ6) {
1238 					mrt6stat.mrt6s_upq_ovflw++;
1239 					free(rte, M_MRTABLE6);
1240 					m_freem(mb0);
1241 					splx(s);
1242 					return (0);
1243 				}
1244 
1245 			/* Add this entry to the end of the queue */
1246 			*p = rte;
1247 		}
1248 
1249 		rte->next = NULL;
1250 		rte->m = mb0;
1251 		rte->ifp = ifp;
1252 #ifdef UPCALL_TIMING
1253 		rte->t = tp;
1254 #endif /* UPCALL_TIMING */
1255 
1256 		splx(s);
1257 
1258 		return (0);
1259 	}
1260 }
1261 
1262 /*
1263  * Clean up cache entries if upcalls are not serviced
1264  * Call from the Slow Timeout mechanism, every half second.
1265  */
1266 static void
1267 expire_upcalls(void *unused)
1268 {
1269 	struct rtdetq *rte;
1270 	struct mf6c *mfc, **nptr;
1271 	int i;
1272 	int s;
1273 
1274 	s = splnet();
1275 	for (i = 0; i < MF6CTBLSIZ; i++) {
1276 		if (n6expire[i] == 0)
1277 			continue;
1278 		nptr = &mf6ctable[i];
1279 		while ((mfc = *nptr) != NULL) {
1280 			rte = mfc->mf6c_stall;
1281 			/*
1282 			 * Skip real cache entries
1283 			 * Make sure it wasn't marked to not expire (shouldn't happen)
1284 			 * If it expires now
1285 			 */
1286 			if (rte != NULL &&
1287 			    mfc->mf6c_expire != 0 &&
1288 			    --mfc->mf6c_expire == 0) {
1289 #ifdef MRT6DEBUG
1290 				if (mrt6debug & DEBUG_EXPIRE) {
1291 					char ip6bufo[INET6_ADDRSTRLEN];
1292 					char ip6bufg[INET6_ADDRSTRLEN];
1293 					log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
1294 					    ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1295 					    ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1296 				}
1297 #endif
1298 				/*
1299 				 * drop all the packets
1300 				 * free the mbuf with the pkt, if, timing info
1301 				 */
1302 				do {
1303 					struct rtdetq *n = rte->next;
1304 					m_freem(rte->m);
1305 					free(rte, M_MRTABLE6);
1306 					rte = n;
1307 				} while (rte != NULL);
1308 				mrt6stat.mrt6s_cache_cleanups++;
1309 				n6expire[i]--;
1310 
1311 				*nptr = mfc->mf6c_next;
1312 				free(mfc, M_MRTABLE6);
1313 			} else {
1314 				nptr = &mfc->mf6c_next;
1315 			}
1316 		}
1317 	}
1318 	splx(s);
1319 	callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1320 	    expire_upcalls, NULL);
1321 }
1322 
1323 /*
1324  * Packet forwarding routine once entry in the cache is made
1325  */
1326 static int
1327 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1328 {
1329 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1330 	mifi_t mifi, iif;
1331 	struct mif6 *mifp;
1332 	int plen = m->m_pkthdr.len;
1333 	struct in6_addr src0, dst0; /* copies for local work */
1334 	u_int32_t iszone, idzone, oszone, odzone;
1335 	int error = 0;
1336 
1337 /*
1338  * Macro to send packet on mif.  Since RSVP packets don't get counted on
1339  * input, they shouldn't get counted on output, so statistics keeping is
1340  * separate.
1341  */
1342 
1343 #define MC6_SEND(ip6, mifp, m) do {				\
1344 	if ((mifp)->m6_flags & MIFF_REGISTER)			\
1345 		register_send((ip6), (mifp), (m));		\
1346 	else							\
1347 		phyint_send((ip6), (mifp), (m));		\
1348 } while (/*CONSTCOND*/ 0)
1349 
1350 	/*
1351 	 * Don't forward if it didn't arrive from the parent mif
1352 	 * for its origin.
1353 	 */
1354 	mifi = rt->mf6c_parent;
1355 	if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1356 		/* came in the wrong interface */
1357 #ifdef MRT6DEBUG
1358 		if (mrt6debug & DEBUG_FORWARD)
1359 			log(LOG_DEBUG,
1360 			    "wrong if: ifid %d mifi %d mififid %x\n",
1361 			    ifp->if_index, mifi,
1362 			    mif6table[mifi].m6_ifp->if_index);
1363 #endif
1364 		mrt6stat.mrt6s_wrong_if++;
1365 		rt->mf6c_wrong_if++;
1366 		/*
1367 		 * If we are doing PIM processing, and we are forwarding
1368 		 * packets on this interface, send a message to the
1369 		 * routing daemon.
1370 		 */
1371 		/* have to make sure this is a valid mif */
1372 		if (mifi < nummifs && mif6table[mifi].m6_ifp)
1373 			if (pim6 && (m->m_flags & M_LOOP) == 0) {
1374 				/*
1375 				 * Check the M_LOOP flag to avoid an
1376 				 * unnecessary PIM assert.
1377 				 * XXX: M_LOOP is an ad-hoc hack...
1378 				 */
1379 				static struct sockaddr_in6 sin6 =
1380 				{ sizeof(sin6), AF_INET6 };
1381 
1382 				struct mbuf *mm;
1383 				struct mrt6msg *im;
1384 #ifdef MRT6_OINIT
1385 				struct omrt6msg *oim;
1386 #endif
1387 
1388 				mm = m_copy(m, 0, sizeof(struct ip6_hdr));
1389 				if (mm &&
1390 				    (M_HASCL(mm) ||
1391 				     mm->m_len < sizeof(struct ip6_hdr)))
1392 					mm = m_pullup(mm, sizeof(struct ip6_hdr));
1393 				if (mm == NULL)
1394 					return (ENOBUFS);
1395 
1396 #ifdef MRT6_OINIT
1397 				oim = NULL;
1398 #endif
1399 				im = NULL;
1400 				switch (ip6_mrouter_ver) {
1401 #ifdef MRT6_OINIT
1402 				case MRT6_OINIT:
1403 					oim = mtod(mm, struct omrt6msg *);
1404 					oim->im6_msgtype = MRT6MSG_WRONGMIF;
1405 					oim->im6_mbz = 0;
1406 					break;
1407 #endif
1408 				case MRT6_INIT:
1409 					im = mtod(mm, struct mrt6msg *);
1410 					im->im6_msgtype = MRT6MSG_WRONGMIF;
1411 					im->im6_mbz = 0;
1412 					break;
1413 				default:
1414 					m_freem(mm);
1415 					return (EINVAL);
1416 				}
1417 
1418 				for (mifp = mif6table, iif = 0;
1419 				     iif < nummifs && mifp &&
1420 					     mifp->m6_ifp != ifp;
1421 				     mifp++, iif++)
1422 					;
1423 
1424 				switch (ip6_mrouter_ver) {
1425 #ifdef MRT6_OINIT
1426 				case MRT6_OINIT:
1427 					oim->im6_mif = iif;
1428 					sin6.sin6_addr = oim->im6_src;
1429 					break;
1430 #endif
1431 				case MRT6_INIT:
1432 					im->im6_mif = iif;
1433 					sin6.sin6_addr = im->im6_src;
1434 					break;
1435 				}
1436 
1437 				mrt6stat.mrt6s_upcalls++;
1438 
1439 				if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1440 #ifdef MRT6DEBUG
1441 					if (mrt6debug)
1442 						log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
1443 #endif
1444 					++mrt6stat.mrt6s_upq_sockfull;
1445 					return (ENOBUFS);
1446 				}	/* if socket Q full */
1447 			}		/* if PIM */
1448 		return (0);
1449 	}			/* if wrong iif */
1450 
1451 	/* If I sourced this packet, it counts as output, else it was input. */
1452 	if (m->m_pkthdr.rcvif == NULL) {
1453 		/* XXX: is rcvif really NULL when output?? */
1454 		mif6table[mifi].m6_pkt_out++;
1455 		mif6table[mifi].m6_bytes_out += plen;
1456 	} else {
1457 		mif6table[mifi].m6_pkt_in++;
1458 		mif6table[mifi].m6_bytes_in += plen;
1459 	}
1460 	rt->mf6c_pkt_cnt++;
1461 	rt->mf6c_byte_cnt += plen;
1462 
1463 	/*
1464 	 * For each mif, forward a copy of the packet if there are group
1465 	 * members downstream on the interface.
1466 	 */
1467 	src0 = ip6->ip6_src;
1468 	dst0 = ip6->ip6_dst;
1469 	if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1470 	    (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1471 		ip6stat.ip6s_badscope++;
1472 		return (error);
1473 	}
1474 	for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1475 		if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1476 			/*
1477 			 * check if the outgoing packet is going to break
1478 			 * a scope boundary.
1479 			 * XXX For packets through PIM register tunnel
1480 			 * interface, we believe a routing daemon.
1481 			 */
1482 			if (!(mif6table[rt->mf6c_parent].m6_flags &
1483 			      MIFF_REGISTER) &&
1484 			    !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1485 				if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1486 				    &oszone) ||
1487 				    in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1488 				    &odzone) ||
1489 				    iszone != oszone ||
1490 				    idzone != odzone) {
1491 					ip6stat.ip6s_badscope++;
1492 					continue;
1493 				}
1494 			}
1495 
1496 			mifp->m6_pkt_out++;
1497 			mifp->m6_bytes_out += plen;
1498 			MC6_SEND(ip6, mifp, m);
1499 		}
1500 	}
1501 	return (0);
1502 }
1503 
1504 static void
1505 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1506 {
1507 	struct mbuf *mb_copy;
1508 	struct ifnet *ifp = mifp->m6_ifp;
1509 	int error = 0;
1510 	int s = splnet();	/* needs to protect static "ro" below. */
1511 	static struct route_in6 ro;
1512 	struct	in6_multi *in6m;
1513 	struct sockaddr_in6 *dst6;
1514 	u_long linkmtu;
1515 
1516 	/*
1517 	 * Make a new reference to the packet; make sure that
1518 	 * the IPv6 header is actually copied, not just referenced,
1519 	 * so that ip6_output() only scribbles on the copy.
1520 	 */
1521 	mb_copy = m_copy(m, 0, M_COPYALL);
1522 	if (mb_copy &&
1523 	    (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1524 		mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1525 	if (mb_copy == NULL) {
1526 		splx(s);
1527 		return;
1528 	}
1529 	/* set MCAST flag to the outgoing packet */
1530 	mb_copy->m_flags |= M_MCAST;
1531 
1532 	/*
1533 	 * If we sourced the packet, call ip6_output since we may devide
1534 	 * the packet into fragments when the packet is too big for the
1535 	 * outgoing interface.
1536 	 * Otherwise, we can simply send the packet to the interface
1537 	 * sending queue.
1538 	 */
1539 	if (m->m_pkthdr.rcvif == NULL) {
1540 		struct ip6_moptions im6o;
1541 
1542 		im6o.im6o_multicast_ifp = ifp;
1543 		/* XXX: ip6_output will override ip6->ip6_hlim */
1544 		im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1545 		im6o.im6o_multicast_loop = 1;
1546 		error = ip6_output(mb_copy, NULL, &ro,
1547 				   IPV6_FORWARDING, &im6o, NULL, NULL);
1548 
1549 #ifdef MRT6DEBUG
1550 		if (mrt6debug & DEBUG_XMIT)
1551 			log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1552 			    mifp - mif6table, error);
1553 #endif
1554 		splx(s);
1555 		return;
1556 	}
1557 
1558 	/*
1559 	 * If we belong to the destination multicast group
1560 	 * on the outgoing interface, loop back a copy.
1561 	 */
1562 	dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
1563 	IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
1564 	if (in6m != NULL) {
1565 		dst6->sin6_len = sizeof(struct sockaddr_in6);
1566 		dst6->sin6_family = AF_INET6;
1567 		dst6->sin6_addr = ip6->ip6_dst;
1568 		ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
1569 	}
1570 	/*
1571 	 * Put the packet into the sending queue of the outgoing interface
1572 	 * if it would fit in the MTU of the interface.
1573 	 */
1574 	linkmtu = IN6_LINKMTU(ifp);
1575 	if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1576 		dst6->sin6_len = sizeof(struct sockaddr_in6);
1577 		dst6->sin6_family = AF_INET6;
1578 		dst6->sin6_addr = ip6->ip6_dst;
1579 		/*
1580 		 * We just call if_output instead of nd6_output here, since
1581 		 * we need no ND for a multicast forwarded packet...right?
1582 		 */
1583 		error = (*ifp->if_output)(ifp, mb_copy,
1584 		    (struct sockaddr *)&ro.ro_dst, NULL);
1585 #ifdef MRT6DEBUG
1586 		if (mrt6debug & DEBUG_XMIT)
1587 			log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
1588 			    mifp - mif6table, error);
1589 #endif
1590 	} else {
1591 		/*
1592 		 * pMTU discovery is intentionally disabled by default, since
1593 		 * various router may notify pMTU in multicast, which can be
1594 		 * a DDoS to a router
1595 		 */
1596 		if (ip6_mcast_pmtu)
1597 			icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1598 		else {
1599 #ifdef MRT6DEBUG
1600 			if (mrt6debug & DEBUG_XMIT) {
1601 				char ip6bufs[INET6_ADDRSTRLEN];
1602 				char ip6bufd[INET6_ADDRSTRLEN];
1603 				log(LOG_DEBUG,
1604 				    "phyint_send: packet too big on %s o %s "
1605 				    "g %s size %d(discarded)\n",
1606 				    if_name(ifp),
1607 				    ip6_sprintf(ip6bufs, &ip6->ip6_src),
1608 				    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1609 				    mb_copy->m_pkthdr.len);
1610 			}
1611 #endif /* MRT6DEBUG */
1612 			m_freem(mb_copy); /* simply discard the packet */
1613 		}
1614 	}
1615 
1616 	splx(s);
1617 }
1618 
1619 static int
1620 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1621 {
1622 	struct mbuf *mm;
1623 	int i, len = m->m_pkthdr.len;
1624 	static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1625 	struct mrt6msg *im6;
1626 
1627 #ifdef MRT6DEBUG
1628 	if (mrt6debug) {
1629 		char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1630 		log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
1631 		    ip6_sprintf(ip6bufs, &ip6->ip6_src),
1632 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1633 	}
1634 #endif
1635 	++pim6stat.pim6s_snd_registers;
1636 
1637 	/* Make a copy of the packet to send to the user level process */
1638 	MGETHDR(mm, M_DONTWAIT, MT_HEADER);
1639 	if (mm == NULL)
1640 		return (ENOBUFS);
1641 	mm->m_pkthdr.rcvif = NULL;
1642 	mm->m_data += max_linkhdr;
1643 	mm->m_len = sizeof(struct ip6_hdr);
1644 
1645 	if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
1646 		m_freem(mm);
1647 		return (ENOBUFS);
1648 	}
1649 	i = MHLEN - M_LEADINGSPACE(mm);
1650 	if (i > len)
1651 		i = len;
1652 	mm = m_pullup(mm, i);
1653 	if (mm == NULL)
1654 		return (ENOBUFS);
1655 /* TODO: check it! */
1656 	mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1657 
1658 	/*
1659 	 * Send message to routing daemon
1660 	 */
1661 	sin6.sin6_addr = ip6->ip6_src;
1662 
1663 	im6 = mtod(mm, struct mrt6msg *);
1664 	im6->im6_msgtype      = MRT6MSG_WHOLEPKT;
1665 	im6->im6_mbz          = 0;
1666 
1667 	im6->im6_mif = mif - mif6table;
1668 
1669 	/* iif info is not given for reg. encap.n */
1670 	mrt6stat.mrt6s_upcalls++;
1671 
1672 	if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
1673 #ifdef MRT6DEBUG
1674 		if (mrt6debug)
1675 			log(LOG_WARNING,
1676 			    "register_send: ip6_mrouter socket queue full\n");
1677 #endif
1678 		++mrt6stat.mrt6s_upq_sockfull;
1679 		return (ENOBUFS);
1680 	}
1681 	return (0);
1682 }
1683 
1684 /*
1685  * PIM sparse mode hook
1686  * Receives the pim control messages, and passes them up to the listening
1687  * socket, using rip6_input.
1688  * The only message processed is the REGISTER pim message; the pim header
1689  * is stripped off, and the inner packet is passed to register_mforward.
1690  */
1691 int
1692 pim6_input(struct mbuf **mp, int *offp, int proto)
1693 {
1694 	struct pim *pim; /* pointer to a pim struct */
1695 	struct ip6_hdr *ip6;
1696 	int pimlen;
1697 	struct mbuf *m = *mp;
1698 	int minlen;
1699 	int off = *offp;
1700 
1701 	++pim6stat.pim6s_rcv_total;
1702 
1703 	ip6 = mtod(m, struct ip6_hdr *);
1704 	pimlen = m->m_pkthdr.len - *offp;
1705 
1706 	/*
1707 	 * Validate lengths
1708 	 */
1709 	if (pimlen < PIM_MINLEN) {
1710 		++pim6stat.pim6s_rcv_tooshort;
1711 #ifdef MRT6DEBUG
1712 		if (mrt6debug & DEBUG_PIM)
1713 			log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
1714 #endif
1715 		m_freem(m);
1716 		return (IPPROTO_DONE);
1717 	}
1718 
1719 	/*
1720 	 * if the packet is at least as big as a REGISTER, go ahead
1721 	 * and grab the PIM REGISTER header size, to avoid another
1722 	 * possible m_pullup() later.
1723 	 *
1724 	 * PIM_MINLEN       == pimhdr + u_int32 == 8
1725 	 * PIM6_REG_MINLEN   == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1726 	 */
1727 	minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1728 
1729 	/*
1730 	 * Make sure that the IP6 and PIM headers in contiguous memory, and
1731 	 * possibly the PIM REGISTER header
1732 	 */
1733 #ifndef PULLDOWN_TEST
1734 	IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
1735 	/* adjust pointer */
1736 	ip6 = mtod(m, struct ip6_hdr *);
1737 
1738 	/* adjust mbuf to point to the PIM header */
1739 	pim = (struct pim *)((caddr_t)ip6 + off);
1740 #else
1741 	IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
1742 	if (pim == NULL) {
1743 		pim6stat.pim6s_rcv_tooshort++;
1744 		return (IPPROTO_DONE);
1745 	}
1746 #endif
1747 
1748 #define PIM6_CHECKSUM
1749 #ifdef PIM6_CHECKSUM
1750 	{
1751 		int cksumlen;
1752 
1753 		/*
1754 		 * Validate checksum.
1755 		 * If PIM REGISTER, exclude the data packet
1756 		 */
1757 		if (pim->pim_type == PIM_REGISTER)
1758 			cksumlen = PIM_MINLEN;
1759 		else
1760 			cksumlen = pimlen;
1761 
1762 		if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1763 			++pim6stat.pim6s_rcv_badsum;
1764 #ifdef MRT6DEBUG
1765 			if (mrt6debug & DEBUG_PIM)
1766 				log(LOG_DEBUG,
1767 				    "pim6_input: invalid checksum\n");
1768 #endif
1769 			m_freem(m);
1770 			return (IPPROTO_DONE);
1771 		}
1772 	}
1773 #endif /* PIM_CHECKSUM */
1774 
1775 	/* PIM version check */
1776 	if (pim->pim_ver != PIM_VERSION) {
1777 		++pim6stat.pim6s_rcv_badversion;
1778 #ifdef MRT6DEBUG
1779 		log(LOG_ERR,
1780 		    "pim6_input: incorrect version %d, expecting %d\n",
1781 		    pim->pim_ver, PIM_VERSION);
1782 #endif
1783 		m_freem(m);
1784 		return (IPPROTO_DONE);
1785 	}
1786 
1787 	if (pim->pim_type == PIM_REGISTER) {
1788 		/*
1789 		 * since this is a REGISTER, we'll make a copy of the register
1790 		 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1791 		 * routing daemon.
1792 		 */
1793 		static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1794 
1795 		struct mbuf *mcp;
1796 		struct ip6_hdr *eip6;
1797 		u_int32_t *reghdr;
1798 		int rc;
1799 #ifdef MRT6DEBUG
1800 		char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1801 #endif
1802 
1803 		++pim6stat.pim6s_rcv_registers;
1804 
1805 		if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1806 #ifdef MRT6DEBUG
1807 			if (mrt6debug & DEBUG_PIM)
1808 				log(LOG_DEBUG,
1809 				    "pim6_input: register mif not set: %d\n",
1810 				    reg_mif_num);
1811 #endif
1812 			m_freem(m);
1813 			return (IPPROTO_DONE);
1814 		}
1815 
1816 		reghdr = (u_int32_t *)(pim + 1);
1817 
1818 		if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1819 			goto pim6_input_to_daemon;
1820 
1821 		/*
1822 		 * Validate length
1823 		 */
1824 		if (pimlen < PIM6_REG_MINLEN) {
1825 			++pim6stat.pim6s_rcv_tooshort;
1826 			++pim6stat.pim6s_rcv_badregisters;
1827 #ifdef MRT6DEBUG
1828 			log(LOG_ERR,
1829 			    "pim6_input: register packet size too "
1830 			    "small %d from %s\n",
1831 			    pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1832 #endif
1833 			m_freem(m);
1834 			return (IPPROTO_DONE);
1835 		}
1836 
1837 		eip6 = (struct ip6_hdr *) (reghdr + 1);
1838 #ifdef MRT6DEBUG
1839 		if (mrt6debug & DEBUG_PIM)
1840 			log(LOG_DEBUG,
1841 			    "pim6_input[register], eip6: %s -> %s, "
1842 			    "eip6 plen %d\n",
1843 			    ip6_sprintf(ip6bufs, &eip6->ip6_src),
1844 			    ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1845 			    ntohs(eip6->ip6_plen));
1846 #endif
1847 
1848 		/* verify the version number of the inner packet */
1849 		if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1850 			++pim6stat.pim6s_rcv_badregisters;
1851 #ifdef MRT6DEBUG
1852 			log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
1853 			    "of the inner packet\n",
1854 			    (eip6->ip6_vfc & IPV6_VERSION));
1855 #endif
1856 			m_freem(m);
1857 			return (IPPROTO_NONE);
1858 		}
1859 
1860 		/* verify the inner packet is destined to a mcast group */
1861 		if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1862 			++pim6stat.pim6s_rcv_badregisters;
1863 #ifdef MRT6DEBUG
1864 			if (mrt6debug & DEBUG_PIM)
1865 				log(LOG_DEBUG,
1866 				    "pim6_input: inner packet of register "
1867 				    "is not multicast %s\n",
1868 				    ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1869 #endif
1870 			m_freem(m);
1871 			return (IPPROTO_DONE);
1872 		}
1873 
1874 		/*
1875 		 * make a copy of the whole header to pass to the daemon later.
1876 		 */
1877 		mcp = m_copy(m, 0, off + PIM6_REG_MINLEN);
1878 		if (mcp == NULL) {
1879 #ifdef MRT6DEBUG
1880 			log(LOG_ERR,
1881 			    "pim6_input: pim register: "
1882 			    "could not copy register head\n");
1883 #endif
1884 			m_freem(m);
1885 			return (IPPROTO_DONE);
1886 		}
1887 
1888 		/*
1889 		 * forward the inner ip6 packet; point m_data at the inner ip6.
1890 		 */
1891 		m_adj(m, off + PIM_MINLEN);
1892 #ifdef MRT6DEBUG
1893 		if (mrt6debug & DEBUG_PIM) {
1894 			log(LOG_DEBUG,
1895 			    "pim6_input: forwarding decapsulated register: "
1896 			    "src %s, dst %s, mif %d\n",
1897 			    ip6_sprintf(ip6bufs, &eip6->ip6_src),
1898 			    ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1899 			    reg_mif_num);
1900 		}
1901 #endif
1902 
1903 		rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1904 				dst.sin6_family, 0);
1905 
1906 		/* prepare the register head to send to the mrouting daemon */
1907 		m = mcp;
1908 	}
1909 
1910 	/*
1911 	 * Pass the PIM message up to the daemon; if it is a register message
1912 	 * pass the 'head' only up to the daemon. This includes the
1913 	 * encapsulator ip6 header, pim header, register header and the
1914 	 * encapsulated ip6 header.
1915 	 */
1916   pim6_input_to_daemon:
1917 	rip6_input(&m, offp, proto);
1918 	return (IPPROTO_DONE);
1919 }
1920