xref: /freebsd/sys/netinet/in.c (revision a0e793cbf1951d07fc47a0d9ea389d7dacba5213)
1 /*-
2  * Copyright (c) 1982, 1986, 1991, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  * Copyright (C) 2001 WIDE Project.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 4. Neither the name of the University nor the names of its contributors
15  *    may be used to endorse or promote products derived from this software
16  *    without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  *	@(#)in.c	8.4 (Berkeley) 1/9/95
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include "opt_mpath.h"
37 
38 #include <sys/param.h>
39 #include <sys/eventhandler.h>
40 #include <sys/systm.h>
41 #include <sys/sockio.h>
42 #include <sys/malloc.h>
43 #include <sys/priv.h>
44 #include <sys/socket.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/proc.h>
48 #include <sys/sysctl.h>
49 #include <sys/syslog.h>
50 #include <sys/sx.h>
51 
52 #include <net/if.h>
53 #include <net/if_var.h>
54 #include <net/if_arp.h>
55 #include <net/if_dl.h>
56 #include <net/if_llatbl.h>
57 #include <net/if_types.h>
58 #include <net/route.h>
59 #include <net/vnet.h>
60 
61 #include <netinet/if_ether.h>
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet/in_pcb.h>
65 #include <netinet/ip_var.h>
66 #include <netinet/ip_carp.h>
67 #include <netinet/igmp_var.h>
68 #include <netinet/udp.h>
69 #include <netinet/udp_var.h>
70 
71 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
72 static int in_difaddr_ioctl(caddr_t, struct ifnet *, struct thread *);
73 
74 static void	in_socktrim(struct sockaddr_in *);
75 static void	in_purgemaddrs(struct ifnet *);
76 
77 static VNET_DEFINE(int, nosameprefix);
78 #define	V_nosameprefix			VNET(nosameprefix)
79 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW,
80 	&VNET_NAME(nosameprefix), 0,
81 	"Refuse to create same prefixes on different interfaces");
82 
83 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
84 #define	V_ripcbinfo			VNET(ripcbinfo)
85 
86 static struct sx in_control_sx;
87 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
88 
89 /*
90  * Return 1 if an internet address is for a ``local'' host
91  * (one to which we have a connection).
92  */
93 int
94 in_localaddr(struct in_addr in)
95 {
96 	register u_long i = ntohl(in.s_addr);
97 	register struct in_ifaddr *ia;
98 
99 	IN_IFADDR_RLOCK();
100 	TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
101 		if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
102 			IN_IFADDR_RUNLOCK();
103 			return (1);
104 		}
105 	}
106 	IN_IFADDR_RUNLOCK();
107 	return (0);
108 }
109 
110 /*
111  * Return 1 if an internet address is for the local host and configured
112  * on one of its interfaces.
113  */
114 int
115 in_localip(struct in_addr in)
116 {
117 	struct in_ifaddr *ia;
118 
119 	IN_IFADDR_RLOCK();
120 	LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
121 		if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
122 			IN_IFADDR_RUNLOCK();
123 			return (1);
124 		}
125 	}
126 	IN_IFADDR_RUNLOCK();
127 	return (0);
128 }
129 
130 /*
131  * Return a reference to the interface address which is different to
132  * the supplied one but with same IP address value.
133  */
134 static struct in_ifaddr *
135 in_localip_more(struct in_ifaddr *ia)
136 {
137 	in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
138 	struct in_ifaddr *it;
139 
140 	IN_IFADDR_RLOCK();
141 	LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
142 		if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
143 			ifa_ref(&it->ia_ifa);
144 			IN_IFADDR_RUNLOCK();
145 			return (it);
146 		}
147 	}
148 	IN_IFADDR_RUNLOCK();
149 
150 	return (NULL);
151 }
152 
153 /*
154  * Determine whether an IP address is in a reserved set of addresses
155  * that may not be forwarded, or whether datagrams to that destination
156  * may be forwarded.
157  */
158 int
159 in_canforward(struct in_addr in)
160 {
161 	register u_long i = ntohl(in.s_addr);
162 	register u_long net;
163 
164 	if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
165 		return (0);
166 	if (IN_CLASSA(i)) {
167 		net = i & IN_CLASSA_NET;
168 		if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
169 			return (0);
170 	}
171 	return (1);
172 }
173 
174 /*
175  * Trim a mask in a sockaddr
176  */
177 static void
178 in_socktrim(struct sockaddr_in *ap)
179 {
180     register char *cplim = (char *) &ap->sin_addr;
181     register char *cp = (char *) (&ap->sin_addr + 1);
182 
183     ap->sin_len = 0;
184     while (--cp >= cplim)
185 	if (*cp) {
186 	    (ap)->sin_len = cp - (char *) (ap) + 1;
187 	    break;
188 	}
189 }
190 
191 /*
192  * Generic internet control operations (ioctl's).
193  */
194 int
195 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
196     struct thread *td)
197 {
198 	struct ifreq *ifr = (struct ifreq *)data;
199 	struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
200 	struct ifaddr *ifa;
201 	struct in_ifaddr *ia;
202 	int error;
203 
204 	if (ifp == NULL)
205 		return (EADDRNOTAVAIL);
206 
207 	/*
208 	 * Filter out 4 ioctls we implement directly.  Forward the rest
209 	 * to specific functions and ifp->if_ioctl().
210 	 */
211 	switch (cmd) {
212 	case SIOCGIFADDR:
213 	case SIOCGIFBRDADDR:
214 	case SIOCGIFDSTADDR:
215 	case SIOCGIFNETMASK:
216 		break;
217 	case SIOCDIFADDR:
218 		sx_xlock(&in_control_sx);
219 		error = in_difaddr_ioctl(data, ifp, td);
220 		sx_xunlock(&in_control_sx);
221 		return (error);
222 	case OSIOCAIFADDR:	/* 9.x compat */
223 	case SIOCAIFADDR:
224 		sx_xlock(&in_control_sx);
225 		error = in_aifaddr_ioctl(cmd, data, ifp, td);
226 		sx_xunlock(&in_control_sx);
227 		return (error);
228 	case SIOCSIFADDR:
229 	case SIOCSIFBRDADDR:
230 	case SIOCSIFDSTADDR:
231 	case SIOCSIFNETMASK:
232 		/* We no longer support that old commands. */
233 		return (EINVAL);
234 	default:
235 		if (ifp->if_ioctl == NULL)
236 			return (EOPNOTSUPP);
237 		return ((*ifp->if_ioctl)(ifp, cmd, data));
238 	}
239 
240 	if (addr->sin_addr.s_addr != INADDR_ANY &&
241 	    prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
242 		return (EADDRNOTAVAIL);
243 
244 	/*
245 	 * For SIOCGIFADDR, pick the first address.  For the rest of
246 	 * ioctls, try to find specified address.
247 	 */
248 	IF_ADDR_RLOCK(ifp);
249 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
250 		if (ifa->ifa_addr->sa_family != AF_INET)
251 			continue;
252 		ia = (struct in_ifaddr *)ifa;
253 		if (cmd == SIOCGIFADDR || addr->sin_addr.s_addr == INADDR_ANY)
254 			break;
255 		if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
256 			break;
257 	}
258 
259 	if (ifa == NULL) {
260 		IF_ADDR_RUNLOCK(ifp);
261 		return (EADDRNOTAVAIL);
262 	}
263 
264 	error = 0;
265 	switch (cmd) {
266 	case SIOCGIFADDR:
267 		*addr = ia->ia_addr;
268 		break;
269 
270 	case SIOCGIFBRDADDR:
271 		if ((ifp->if_flags & IFF_BROADCAST) == 0) {
272 			error = EINVAL;
273 			break;
274 		}
275 		*addr = ia->ia_broadaddr;
276 		break;
277 
278 	case SIOCGIFDSTADDR:
279 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
280 			error = EINVAL;
281 			break;
282 		}
283 		*addr = ia->ia_dstaddr;
284 		break;
285 
286 	case SIOCGIFNETMASK:
287 		*addr = ia->ia_sockmask;
288 		break;
289 	}
290 
291 	IF_ADDR_RUNLOCK(ifp);
292 
293 	return (error);
294 }
295 
296 static int
297 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
298 {
299 	const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
300 	const struct sockaddr_in *addr = &ifra->ifra_addr;
301 	const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
302 	const struct sockaddr_in *mask = &ifra->ifra_mask;
303 	const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
304 	const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
305 	struct ifaddr *ifa;
306 	struct in_ifaddr *ia;
307 	bool iaIsFirst;
308 	int error = 0;
309 
310 	error = priv_check(td, PRIV_NET_ADDIFADDR);
311 	if (error)
312 		return (error);
313 
314 	/*
315 	 * ifra_addr must be present and be of INET family.
316 	 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
317 	 */
318 	if (addr->sin_len != sizeof(struct sockaddr_in) ||
319 	    addr->sin_family != AF_INET)
320 		return (EINVAL);
321 	if (broadaddr->sin_len != 0 &&
322 	    (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
323 	    broadaddr->sin_family != AF_INET))
324 		return (EINVAL);
325 	if (mask->sin_len != 0 &&
326 	    (mask->sin_len != sizeof(struct sockaddr_in) ||
327 	    mask->sin_family != AF_INET))
328 		return (EINVAL);
329 	if ((ifp->if_flags & IFF_POINTOPOINT) &&
330 	    (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
331 	     dstaddr->sin_addr.s_addr == INADDR_ANY))
332 		return (EDESTADDRREQ);
333 	if (vhid > 0 && carp_attach_p == NULL)
334 		return (EPROTONOSUPPORT);
335 
336 	/*
337 	 * See whether address already exist.
338 	 */
339 	iaIsFirst = true;
340 	ia = NULL;
341 	IF_ADDR_RLOCK(ifp);
342 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
343 		struct in_ifaddr *it;
344 
345 		if (ifa->ifa_addr->sa_family != AF_INET)
346 			continue;
347 
348 		it = (struct in_ifaddr *)ifa;
349 		iaIsFirst = false;
350 		if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
351 		    prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
352 			ia = it;
353 	}
354 	IF_ADDR_RUNLOCK(ifp);
355 
356 	if (ia != NULL)
357 		(void )in_difaddr_ioctl(data, ifp, td);
358 
359 	ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
360 	ia = (struct in_ifaddr *)ifa;
361 	ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
362 	ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
363 	ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
364 
365 	ia->ia_ifp = ifp;
366 	ia->ia_addr = *addr;
367 	if (mask->sin_len != 0) {
368 		ia->ia_sockmask = *mask;
369 		ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
370 	} else {
371 		in_addr_t i = ntohl(addr->sin_addr.s_addr);
372 
373 		/*
374 	 	 * Be compatible with network classes, if netmask isn't
375 		 * supplied, guess it based on classes.
376 	 	 */
377 		if (IN_CLASSA(i))
378 			ia->ia_subnetmask = IN_CLASSA_NET;
379 		else if (IN_CLASSB(i))
380 			ia->ia_subnetmask = IN_CLASSB_NET;
381 		else
382 			ia->ia_subnetmask = IN_CLASSC_NET;
383 		ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
384 	}
385 	ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
386 	in_socktrim(&ia->ia_sockmask);
387 
388 	if (ifp->if_flags & IFF_BROADCAST) {
389 		if (broadaddr->sin_len != 0) {
390 			ia->ia_broadaddr = *broadaddr;
391 		} else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
392 			ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
393 			ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
394 			ia->ia_broadaddr.sin_family = AF_INET;
395 		} else {
396 			ia->ia_broadaddr.sin_addr.s_addr =
397 			    htonl(ia->ia_subnet | ~ia->ia_subnetmask);
398 			ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
399 			ia->ia_broadaddr.sin_family = AF_INET;
400 		}
401 	}
402 
403 	if (ifp->if_flags & IFF_POINTOPOINT)
404 		ia->ia_dstaddr = *dstaddr;
405 
406 	/* XXXGL: rtinit() needs this strange assignment. */
407 	if (ifp->if_flags & IFF_LOOPBACK)
408                 ia->ia_dstaddr = ia->ia_addr;
409 
410 	if (vhid != 0) {
411 		error = (*carp_attach_p)(&ia->ia_ifa, vhid);
412 		if (error)
413 			return (error);
414 	}
415 
416 	/* if_addrhead is already referenced by ifa_alloc() */
417 	IF_ADDR_WLOCK(ifp);
418 	TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
419 	IF_ADDR_WUNLOCK(ifp);
420 
421 	ifa_ref(ifa);			/* in_ifaddrhead */
422 	IN_IFADDR_WLOCK();
423 	TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
424 	LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
425 	IN_IFADDR_WUNLOCK();
426 
427 	/*
428 	 * Give the interface a chance to initialize
429 	 * if this is its first address,
430 	 * and to validate the address if necessary.
431 	 */
432 	if (ifp->if_ioctl != NULL) {
433 		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
434 		if (error)
435 			goto fail1;
436 	}
437 
438 	/*
439 	 * Add route for the network.
440 	 */
441 	if (vhid == 0) {
442 		int flags = RTF_UP;
443 
444 		if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
445 			flags |= RTF_HOST;
446 
447 		error = in_addprefix(ia, flags);
448 		if (error)
449 			goto fail1;
450 	}
451 
452 	/*
453 	 * Add a loopback route to self.
454 	 */
455 	if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
456 	    ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
457 	    !((ifp->if_flags & IFF_POINTOPOINT) &&
458 	     ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
459 		struct in_ifaddr *eia;
460 
461 		eia = in_localip_more(ia);
462 
463 		if (eia == NULL) {
464 			error = ifa_add_loopback_route((struct ifaddr *)ia,
465 			    (struct sockaddr *)&ia->ia_addr);
466 			if (error)
467 				goto fail2;
468 		} else
469 			ifa_free(&eia->ia_ifa);
470 	}
471 
472 	if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
473 		struct in_addr allhosts_addr;
474 		struct in_ifinfo *ii;
475 
476 		ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
477 		allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
478 
479 		error = in_joingroup(ifp, &allhosts_addr, NULL,
480 			&ii->ii_allhosts);
481 	}
482 
483 	EVENTHANDLER_INVOKE(ifaddr_event, ifp);
484 
485 	return (error);
486 
487 fail2:
488 	if (vhid == 0)
489 		(void )in_scrubprefix(ia, LLE_STATIC);
490 
491 fail1:
492 	if (ia->ia_ifa.ifa_carp)
493 		(*carp_detach_p)(&ia->ia_ifa);
494 
495 	IF_ADDR_WLOCK(ifp);
496 	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
497 	IF_ADDR_WUNLOCK(ifp);
498 	ifa_free(&ia->ia_ifa);		/* if_addrhead */
499 
500 	IN_IFADDR_WLOCK();
501 	TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
502 	LIST_REMOVE(ia, ia_hash);
503 	IN_IFADDR_WUNLOCK();
504 	ifa_free(&ia->ia_ifa);		/* in_ifaddrhead */
505 
506 	return (error);
507 }
508 
509 static int
510 in_difaddr_ioctl(caddr_t data, struct ifnet *ifp, struct thread *td)
511 {
512 	const struct ifreq *ifr = (struct ifreq *)data;
513 	const struct sockaddr_in *addr = (const struct sockaddr_in *)
514 	    &ifr->ifr_addr;
515 	struct ifaddr *ifa;
516 	struct in_ifaddr *ia;
517 	bool deleteAny, iaIsLast;
518 	int error;
519 
520 	if (td != NULL) {
521 		error = priv_check(td, PRIV_NET_DELIFADDR);
522 		if (error)
523 			return (error);
524 	}
525 
526 	if (addr->sin_len != sizeof(struct sockaddr_in) ||
527 	    addr->sin_family != AF_INET)
528 		deleteAny = true;
529 	else
530 		deleteAny = false;
531 
532 	iaIsLast = true;
533 	ia = NULL;
534 	IF_ADDR_WLOCK(ifp);
535 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
536 		struct in_ifaddr *it;
537 
538 		if (ifa->ifa_addr->sa_family != AF_INET)
539 			continue;
540 
541 		it = (struct in_ifaddr *)ifa;
542 		if (deleteAny && ia == NULL && (td == NULL ||
543 		    prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
544 			ia = it;
545 
546 		if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
547 		    (td == NULL || prison_check_ip4(td->td_ucred,
548 		    &addr->sin_addr) == 0))
549 			ia = it;
550 
551 		if (it != ia)
552 			iaIsLast = false;
553 	}
554 
555 	if (ia == NULL) {
556 		IF_ADDR_WUNLOCK(ifp);
557 		return (EADDRNOTAVAIL);
558 	}
559 
560 	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
561 	IF_ADDR_WUNLOCK(ifp);
562 	ifa_free(&ia->ia_ifa);		/* if_addrhead */
563 
564 	IN_IFADDR_WLOCK();
565 	TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
566 	LIST_REMOVE(ia, ia_hash);
567 	IN_IFADDR_WUNLOCK();
568 
569 	/*
570 	 * in_scrubprefix() kills the interface route.
571 	 */
572 	in_scrubprefix(ia, LLE_STATIC);
573 
574 	/*
575 	 * in_ifadown gets rid of all the rest of
576 	 * the routes.  This is not quite the right
577 	 * thing to do, but at least if we are running
578 	 * a routing process they will come back.
579 	 */
580 	in_ifadown(&ia->ia_ifa, 1);
581 
582 	if (ia->ia_ifa.ifa_carp)
583 		(*carp_detach_p)(&ia->ia_ifa);
584 
585 	/*
586 	 * If this is the last IPv4 address configured on this
587 	 * interface, leave the all-hosts group.
588 	 * No state-change report need be transmitted.
589 	 */
590 	if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
591 		struct in_ifinfo *ii;
592 
593 		ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
594 		IN_MULTI_LOCK();
595 		if (ii->ii_allhosts) {
596 			(void)in_leavegroup_locked(ii->ii_allhosts, NULL);
597 			ii->ii_allhosts = NULL;
598 		}
599 		IN_MULTI_UNLOCK();
600 	}
601 
602 	EVENTHANDLER_INVOKE(ifaddr_event, ifp);
603 	ifa_free(&ia->ia_ifa);		/* in_ifaddrhead */
604 
605 	return (0);
606 }
607 
608 #define rtinitflags(x) \
609 	((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
610 	    ? RTF_HOST : 0)
611 
612 /*
613  * Check if we have a route for the given prefix already or add one accordingly.
614  */
615 int
616 in_addprefix(struct in_ifaddr *target, int flags)
617 {
618 	struct in_ifaddr *ia;
619 	struct in_addr prefix, mask, p, m;
620 	int error;
621 
622 	if ((flags & RTF_HOST) != 0) {
623 		prefix = target->ia_dstaddr.sin_addr;
624 		mask.s_addr = 0;
625 	} else {
626 		prefix = target->ia_addr.sin_addr;
627 		mask = target->ia_sockmask.sin_addr;
628 		prefix.s_addr &= mask.s_addr;
629 	}
630 
631 	IN_IFADDR_RLOCK();
632 	/* Look for an existing address with the same prefix, mask, and fib */
633 	TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
634 		if (rtinitflags(ia)) {
635 			p = ia->ia_dstaddr.sin_addr;
636 
637 			if (prefix.s_addr != p.s_addr)
638 				continue;
639 		} else {
640 			p = ia->ia_addr.sin_addr;
641 			m = ia->ia_sockmask.sin_addr;
642 			p.s_addr &= m.s_addr;
643 
644 			if (prefix.s_addr != p.s_addr ||
645 			    mask.s_addr != m.s_addr)
646 				continue;
647 		}
648 		if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
649 			continue;
650 
651 		/*
652 		 * If we got a matching prefix route inserted by other
653 		 * interface address, we are done here.
654 		 */
655 		if (ia->ia_flags & IFA_ROUTE) {
656 #ifdef RADIX_MPATH
657 			if (ia->ia_addr.sin_addr.s_addr ==
658 			    target->ia_addr.sin_addr.s_addr) {
659 				IN_IFADDR_RUNLOCK();
660 				return (EEXIST);
661 			} else
662 				break;
663 #endif
664 			if (V_nosameprefix) {
665 				IN_IFADDR_RUNLOCK();
666 				return (EEXIST);
667 			} else {
668 				int fibnum;
669 
670 				fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS :
671 					target->ia_ifp->if_fib;
672 				rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
673 				IN_IFADDR_RUNLOCK();
674 				return (0);
675 			}
676 		}
677 	}
678 	IN_IFADDR_RUNLOCK();
679 
680 	/*
681 	 * No-one seem to have this prefix route, so we try to insert it.
682 	 */
683 	error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
684 	if (!error)
685 		target->ia_flags |= IFA_ROUTE;
686 	return (error);
687 }
688 
689 /*
690  * If there is no other address in the system that can serve a route to the
691  * same prefix, remove the route.  Hand over the route to the new address
692  * otherwise.
693  */
694 int
695 in_scrubprefix(struct in_ifaddr *target, u_int flags)
696 {
697 	struct in_ifaddr *ia;
698 	struct in_addr prefix, mask, p, m;
699 	int error = 0;
700 	struct sockaddr_in prefix0, mask0;
701 
702 	/*
703 	 * Remove the loopback route to the interface address.
704 	 */
705 	if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
706 	    !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
707 	    (flags & LLE_STATIC)) {
708 		struct in_ifaddr *eia;
709 
710 		eia = in_localip_more(target);
711 
712 		if (eia != NULL) {
713 			int fibnum = target->ia_ifp->if_fib;
714 
715 			error = ifa_switch_loopback_route((struct ifaddr *)eia,
716 			    (struct sockaddr *)&target->ia_addr, fibnum);
717 			ifa_free(&eia->ia_ifa);
718 		} else {
719 			error = ifa_del_loopback_route((struct ifaddr *)target,
720 			    (struct sockaddr *)&target->ia_addr);
721 		}
722 
723 		if (!(target->ia_ifp->if_flags & IFF_NOARP))
724 			/* remove arp cache */
725 			arp_ifscrub(target->ia_ifp,
726 			    IA_SIN(target)->sin_addr.s_addr);
727 	}
728 
729 	if (rtinitflags(target)) {
730 		prefix = target->ia_dstaddr.sin_addr;
731 		mask.s_addr = 0;
732 	} else {
733 		prefix = target->ia_addr.sin_addr;
734 		mask = target->ia_sockmask.sin_addr;
735 		prefix.s_addr &= mask.s_addr;
736 	}
737 
738 	if ((target->ia_flags & IFA_ROUTE) == 0) {
739 		int fibnum;
740 
741 		fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS :
742 			target->ia_ifp->if_fib;
743 		rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
744 		return (0);
745 	}
746 
747 	IN_IFADDR_RLOCK();
748 	TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
749 		if (rtinitflags(ia)) {
750 			p = ia->ia_dstaddr.sin_addr;
751 
752 			if (prefix.s_addr != p.s_addr)
753 				continue;
754 		} else {
755 			p = ia->ia_addr.sin_addr;
756 			m = ia->ia_sockmask.sin_addr;
757 			p.s_addr &= m.s_addr;
758 
759 			if (prefix.s_addr != p.s_addr ||
760 			    mask.s_addr != m.s_addr)
761 				continue;
762 		}
763 
764 		if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
765 			continue;
766 
767 		/*
768 		 * If we got a matching prefix address, move IFA_ROUTE and
769 		 * the route itself to it.  Make sure that routing daemons
770 		 * get a heads-up.
771 		 */
772 		if ((ia->ia_flags & IFA_ROUTE) == 0) {
773 			ifa_ref(&ia->ia_ifa);
774 			IN_IFADDR_RUNLOCK();
775 			error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
776 			    rtinitflags(target));
777 			if (error == 0)
778 				target->ia_flags &= ~IFA_ROUTE;
779 			else
780 				log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
781 					error);
782 			error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
783 			    rtinitflags(ia) | RTF_UP);
784 			if (error == 0)
785 				ia->ia_flags |= IFA_ROUTE;
786 			else
787 				log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
788 					error);
789 			ifa_free(&ia->ia_ifa);
790 			return (error);
791 		}
792 	}
793 	IN_IFADDR_RUNLOCK();
794 
795 	/*
796 	 * remove all L2 entries on the given prefix
797 	 */
798 	bzero(&prefix0, sizeof(prefix0));
799 	prefix0.sin_len = sizeof(prefix0);
800 	prefix0.sin_family = AF_INET;
801 	prefix0.sin_addr.s_addr = target->ia_subnet;
802 	bzero(&mask0, sizeof(mask0));
803 	mask0.sin_len = sizeof(mask0);
804 	mask0.sin_family = AF_INET;
805 	mask0.sin_addr.s_addr = target->ia_subnetmask;
806 	lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
807 	    (struct sockaddr *)&mask0, flags);
808 
809 	/*
810 	 * As no-one seem to have this prefix, we can remove the route.
811 	 */
812 	error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
813 	if (error == 0)
814 		target->ia_flags &= ~IFA_ROUTE;
815 	else
816 		log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
817 	return (error);
818 }
819 
820 #undef rtinitflags
821 
822 /*
823  * Return 1 if the address might be a local broadcast address.
824  */
825 int
826 in_broadcast(struct in_addr in, struct ifnet *ifp)
827 {
828 	register struct ifaddr *ifa;
829 	u_long t;
830 
831 	if (in.s_addr == INADDR_BROADCAST ||
832 	    in.s_addr == INADDR_ANY)
833 		return (1);
834 	if ((ifp->if_flags & IFF_BROADCAST) == 0)
835 		return (0);
836 	t = ntohl(in.s_addr);
837 	/*
838 	 * Look through the list of addresses for a match
839 	 * with a broadcast address.
840 	 */
841 #define ia ((struct in_ifaddr *)ifa)
842 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
843 		if (ifa->ifa_addr->sa_family == AF_INET &&
844 		    (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
845 		     /*
846 		      * Check for old-style (host 0) broadcast, but
847 		      * taking into account that RFC 3021 obsoletes it.
848 		      */
849 		    (ia->ia_subnetmask != IN_RFC3021_MASK &&
850 		    t == ia->ia_subnet)) &&
851 		     /*
852 		      * Check for an all one subnetmask. These
853 		      * only exist when an interface gets a secondary
854 		      * address.
855 		      */
856 		    ia->ia_subnetmask != (u_long)0xffffffff)
857 			    return (1);
858 	return (0);
859 #undef ia
860 }
861 
862 /*
863  * On interface removal, clean up IPv4 data structures hung off of the ifnet.
864  */
865 void
866 in_ifdetach(struct ifnet *ifp)
867 {
868 
869 	in_pcbpurgeif0(&V_ripcbinfo, ifp);
870 	in_pcbpurgeif0(&V_udbinfo, ifp);
871 	in_pcbpurgeif0(&V_ulitecbinfo, ifp);
872 	in_purgemaddrs(ifp);
873 }
874 
875 /*
876  * Delete all IPv4 multicast address records, and associated link-layer
877  * multicast address records, associated with ifp.
878  * XXX It looks like domifdetach runs AFTER the link layer cleanup.
879  * XXX This should not race with ifma_protospec being set during
880  * a new allocation, if it does, we have bigger problems.
881  */
882 static void
883 in_purgemaddrs(struct ifnet *ifp)
884 {
885 	LIST_HEAD(,in_multi) purgeinms;
886 	struct in_multi		*inm, *tinm;
887 	struct ifmultiaddr	*ifma;
888 
889 	LIST_INIT(&purgeinms);
890 	IN_MULTI_LOCK();
891 
892 	/*
893 	 * Extract list of in_multi associated with the detaching ifp
894 	 * which the PF_INET layer is about to release.
895 	 * We need to do this as IF_ADDR_LOCK() may be re-acquired
896 	 * by code further down.
897 	 */
898 	IF_ADDR_RLOCK(ifp);
899 	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
900 		if (ifma->ifma_addr->sa_family != AF_INET ||
901 		    ifma->ifma_protospec == NULL)
902 			continue;
903 #if 0
904 		KASSERT(ifma->ifma_protospec != NULL,
905 		    ("%s: ifma_protospec is NULL", __func__));
906 #endif
907 		inm = (struct in_multi *)ifma->ifma_protospec;
908 		LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
909 	}
910 	IF_ADDR_RUNLOCK(ifp);
911 
912 	LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
913 		LIST_REMOVE(inm, inm_link);
914 		inm_release_locked(inm);
915 	}
916 	igmp_ifdetach(ifp);
917 
918 	IN_MULTI_UNLOCK();
919 }
920 
921 struct in_llentry {
922 	struct llentry		base;
923 	struct sockaddr_in	l3_addr4;
924 };
925 
926 /*
927  * Deletes an address from the address table.
928  * This function is called by the timer functions
929  * such as arptimer() and nd6_llinfo_timer(), and
930  * the caller does the locking.
931  */
932 static void
933 in_lltable_free(struct lltable *llt, struct llentry *lle)
934 {
935 	LLE_WUNLOCK(lle);
936 	LLE_LOCK_DESTROY(lle);
937 	free(lle, M_LLTABLE);
938 }
939 
940 static struct llentry *
941 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
942 {
943 	struct in_llentry *lle;
944 
945 	lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
946 	if (lle == NULL)		/* NB: caller generates msg */
947 		return NULL;
948 
949 	/*
950 	 * For IPv4 this will trigger "arpresolve" to generate
951 	 * an ARP request.
952 	 */
953 	lle->base.la_expire = time_uptime; /* mark expired */
954 	lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
955 	lle->base.lle_refcnt = 1;
956 	lle->base.lle_free = in_lltable_free;
957 	LLE_LOCK_INIT(&lle->base);
958 	callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock,
959 	    CALLOUT_RETURNUNLOCKED);
960 
961 	return (&lle->base);
962 }
963 
964 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)	(			\
965 	    (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
966 
967 static void
968 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
969     const struct sockaddr *mask, u_int flags)
970 {
971 	const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
972 	const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
973 	struct llentry *lle, *next;
974 	int i;
975 	size_t pkts_dropped;
976 
977 	IF_AFDATA_WLOCK(llt->llt_ifp);
978 	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
979 		LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
980 			/*
981 			 * (flags & LLE_STATIC) means deleting all entries
982 			 * including static ARP entries.
983 			 */
984 			if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)),
985 			    pfx, msk) && ((flags & LLE_STATIC) ||
986 			    !(lle->la_flags & LLE_STATIC))) {
987 				LLE_WLOCK(lle);
988 				if (callout_stop(&lle->la_timer))
989 					LLE_REMREF(lle);
990 				pkts_dropped = llentry_free(lle);
991 				ARPSTAT_ADD(dropped, pkts_dropped);
992 			}
993 		}
994 	}
995 	IF_AFDATA_WUNLOCK(llt->llt_ifp);
996 }
997 
998 
999 static int
1000 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1001 {
1002 	struct rtentry *rt;
1003 
1004 	KASSERT(l3addr->sa_family == AF_INET,
1005 	    ("sin_family %d", l3addr->sa_family));
1006 
1007 	/* XXX rtalloc1_fib should take a const param */
1008 	rt = rtalloc1_fib(__DECONST(struct sockaddr *, l3addr), 0, 0,
1009 	    ifp->if_fib);
1010 
1011 	if (rt == NULL)
1012 		return (EINVAL);
1013 
1014 	/*
1015 	 * If the gateway for an existing host route matches the target L3
1016 	 * address, which is a special route inserted by some implementation
1017 	 * such as MANET, and the interface is of the correct type, then
1018 	 * allow for ARP to proceed.
1019 	 */
1020 	if (rt->rt_flags & RTF_GATEWAY) {
1021 		if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
1022 		    rt->rt_ifp->if_type != IFT_ETHER ||
1023 		    (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1024 		    memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
1025 		    sizeof(in_addr_t)) != 0) {
1026 			RTFREE_LOCKED(rt);
1027 			return (EINVAL);
1028 		}
1029 	}
1030 
1031 	/*
1032 	 * Make sure that at least the destination address is covered
1033 	 * by the route. This is for handling the case where 2 or more
1034 	 * interfaces have the same prefix. An incoming packet arrives
1035 	 * on one interface and the corresponding outgoing packet leaves
1036 	 * another interface.
1037 	 */
1038 	if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
1039 		const char *sa, *mask, *addr, *lim;
1040 		int len;
1041 
1042 		mask = (const char *)rt_mask(rt);
1043 		/*
1044 		 * Just being extra cautious to avoid some custom
1045 		 * code getting into trouble.
1046 		 */
1047 		if (mask == NULL) {
1048 			RTFREE_LOCKED(rt);
1049 			return (EINVAL);
1050 		}
1051 
1052 		sa = (const char *)rt_key(rt);
1053 		addr = (const char *)l3addr;
1054 		len = ((const struct sockaddr_in *)l3addr)->sin_len;
1055 		lim = addr + len;
1056 
1057 		for ( ; addr < lim; sa++, mask++, addr++) {
1058 			if ((*sa ^ *addr) & *mask) {
1059 #ifdef DIAGNOSTIC
1060 				log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1061 				    inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1062 #endif
1063 				RTFREE_LOCKED(rt);
1064 				return (EINVAL);
1065 			}
1066 		}
1067 	}
1068 
1069 	RTFREE_LOCKED(rt);
1070 	return (0);
1071 }
1072 
1073 /*
1074  * Return NULL if not found or marked for deletion.
1075  * If found return lle read locked.
1076  */
1077 static struct llentry *
1078 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1079 {
1080 	const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1081 	struct ifnet *ifp = llt->llt_ifp;
1082 	struct llentry *lle;
1083 	struct llentries *lleh;
1084 	u_int hashkey;
1085 
1086 	IF_AFDATA_LOCK_ASSERT(ifp);
1087 	KASSERT(l3addr->sa_family == AF_INET,
1088 	    ("sin_family %d", l3addr->sa_family));
1089 
1090 	hashkey = sin->sin_addr.s_addr;
1091 	lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
1092 	LIST_FOREACH(lle, lleh, lle_next) {
1093 		struct sockaddr_in *sa2 = satosin(L3_ADDR(lle));
1094 		if (lle->la_flags & LLE_DELETED)
1095 			continue;
1096 		if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
1097 			break;
1098 	}
1099 	if (lle == NULL) {
1100 #ifdef DIAGNOSTIC
1101 		if (flags & LLE_DELETE)
1102 			log(LOG_INFO, "interface address is missing from cache = %p  in delete\n", lle);
1103 #endif
1104 		if (!(flags & LLE_CREATE))
1105 			return (NULL);
1106 		IF_AFDATA_WLOCK_ASSERT(ifp);
1107 		/*
1108 		 * A route that covers the given address must have
1109 		 * been installed 1st because we are doing a resolution,
1110 		 * verify this.
1111 		 */
1112 		if (!(flags & LLE_IFADDR) &&
1113 		    in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1114 			goto done;
1115 
1116 		lle = in_lltable_new(l3addr, flags);
1117 		if (lle == NULL) {
1118 			log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1119 			goto done;
1120 		}
1121 		lle->la_flags = flags & ~LLE_CREATE;
1122 		if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
1123 			bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
1124 			lle->la_flags |= (LLE_VALID | LLE_STATIC);
1125 		}
1126 
1127 		lle->lle_tbl  = llt;
1128 		lle->lle_head = lleh;
1129 		lle->la_flags |= LLE_LINKED;
1130 		LIST_INSERT_HEAD(lleh, lle, lle_next);
1131 	} else if (flags & LLE_DELETE) {
1132 		if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
1133 			LLE_WLOCK(lle);
1134 			lle->la_flags |= LLE_DELETED;
1135 			EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1136 #ifdef DIAGNOSTIC
1137 			log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1138 #endif
1139 			if ((lle->la_flags &
1140 			    (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
1141 				llentry_free(lle);
1142 			else
1143 				LLE_WUNLOCK(lle);
1144 		}
1145 		lle = (void *)-1;
1146 
1147 	}
1148 	if (LLE_IS_VALID(lle)) {
1149 		if (flags & LLE_EXCLUSIVE)
1150 			LLE_WLOCK(lle);
1151 		else
1152 			LLE_RLOCK(lle);
1153 	}
1154 done:
1155 	return (lle);
1156 }
1157 
1158 static int
1159 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
1160 {
1161 #define	SIN(lle)	((struct sockaddr_in *) L3_ADDR(lle))
1162 	struct ifnet *ifp = llt->llt_ifp;
1163 	struct llentry *lle;
1164 	/* XXX stack use */
1165 	struct {
1166 		struct rt_msghdr	rtm;
1167 		struct sockaddr_in	sin;
1168 		struct sockaddr_dl	sdl;
1169 	} arpc;
1170 	int error, i;
1171 
1172 	LLTABLE_LOCK_ASSERT();
1173 
1174 	error = 0;
1175 	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
1176 		LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
1177 			struct sockaddr_dl *sdl;
1178 
1179 			/* skip deleted entries */
1180 			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1181 				continue;
1182 			/* Skip if jailed and not a valid IP of the prison. */
1183 			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
1184 				continue;
1185 			/*
1186 			 * produce a msg made of:
1187 			 *  struct rt_msghdr;
1188 			 *  struct sockaddr_in; (IPv4)
1189 			 *  struct sockaddr_dl;
1190 			 */
1191 			bzero(&arpc, sizeof(arpc));
1192 			arpc.rtm.rtm_msglen = sizeof(arpc);
1193 			arpc.rtm.rtm_version = RTM_VERSION;
1194 			arpc.rtm.rtm_type = RTM_GET;
1195 			arpc.rtm.rtm_flags = RTF_UP;
1196 			arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1197 			arpc.sin.sin_family = AF_INET;
1198 			arpc.sin.sin_len = sizeof(arpc.sin);
1199 			arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
1200 
1201 			/* publish */
1202 			if (lle->la_flags & LLE_PUB)
1203 				arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1204 
1205 			sdl = &arpc.sdl;
1206 			sdl->sdl_family = AF_LINK;
1207 			sdl->sdl_len = sizeof(*sdl);
1208 			sdl->sdl_index = ifp->if_index;
1209 			sdl->sdl_type = ifp->if_type;
1210 			if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1211 				sdl->sdl_alen = ifp->if_addrlen;
1212 				bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1213 			} else {
1214 				sdl->sdl_alen = 0;
1215 				bzero(LLADDR(sdl), ifp->if_addrlen);
1216 			}
1217 
1218 			arpc.rtm.rtm_rmx.rmx_expire =
1219 			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1220 			arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1221 			if (lle->la_flags & LLE_STATIC)
1222 				arpc.rtm.rtm_flags |= RTF_STATIC;
1223 			arpc.rtm.rtm_index = ifp->if_index;
1224 			error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1225 			if (error)
1226 				break;
1227 		}
1228 	}
1229 	return error;
1230 #undef SIN
1231 }
1232 
1233 void *
1234 in_domifattach(struct ifnet *ifp)
1235 {
1236 	struct in_ifinfo *ii;
1237 	struct lltable *llt;
1238 
1239 	ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1240 
1241 	llt = lltable_init(ifp, AF_INET);
1242 	if (llt != NULL) {
1243 		llt->llt_prefix_free = in_lltable_prefix_free;
1244 		llt->llt_lookup = in_lltable_lookup;
1245 		llt->llt_dump = in_lltable_dump;
1246 	}
1247 	ii->ii_llt = llt;
1248 
1249 	ii->ii_igmp = igmp_domifattach(ifp);
1250 
1251 	return ii;
1252 }
1253 
1254 void
1255 in_domifdetach(struct ifnet *ifp, void *aux)
1256 {
1257 	struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1258 
1259 	igmp_domifdetach(ifp);
1260 	lltable_free(ii->ii_llt);
1261 	free(ii, M_IFADDR);
1262 }
1263