xref: /freebsd/sys/net/route.c (revision b197d4b893974c9eb4d7b38704c6d5c486235d6f)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1980, 1986, 1991, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	@(#)route.c	8.3.1.1 (Berkeley) 2/23/95
32  * $FreeBSD$
33  */
34 /************************************************************************
35  * Note: In this file a 'fib' is a "forwarding information base"	*
36  * Which is the new name for an in kernel routing (next hop) table.	*
37  ***********************************************************************/
38 
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41 #include "opt_mrouting.h"
42 #include "opt_route.h"
43 
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/malloc.h>
47 #include <sys/mbuf.h>
48 #include <sys/socket.h>
49 #include <sys/sysctl.h>
50 #include <sys/syslog.h>
51 #include <sys/sysproto.h>
52 #include <sys/proc.h>
53 #include <sys/devctl.h>
54 #include <sys/domain.h>
55 #include <sys/eventhandler.h>
56 #include <sys/kernel.h>
57 #include <sys/lock.h>
58 #include <sys/rmlock.h>
59 
60 #include <net/if.h>
61 #include <net/if_var.h>
62 #include <net/if_dl.h>
63 #include <net/route.h>
64 #include <net/route/route_ctl.h>
65 #include <net/route/route_var.h>
66 #include <net/route/nhop.h>
67 #include <net/vnet.h>
68 
69 #include <netinet/in.h>
70 #include <netinet/ip_mroute.h>
71 #include <netinet6/in6_var.h>
72 
73 VNET_PCPUSTAT_DEFINE(struct rtstat, rtstat);
74 
75 VNET_PCPUSTAT_SYSINIT(rtstat);
76 #ifdef VIMAGE
77 VNET_PCPUSTAT_SYSUNINIT(rtstat);
78 #endif
79 
80 EVENTHANDLER_LIST_DEFINE(rt_addrmsg);
81 
82 static int rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *,
83     void *arg);
84 
85 /*
86  * route initialization must occur before ip6_init2(), which happenas at
87  * SI_ORDER_MIDDLE.
88  */
89 static void
90 route_init(void)
91 {
92 
93 	nhops_init();
94 }
95 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, NULL);
96 
97 struct rib_head *
98 rt_table_init(int offset, int family, u_int fibnum)
99 {
100 	struct rib_head *rh;
101 
102 	rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO);
103 
104 	/* TODO: These details should be hidded inside radix.c */
105 	/* Init masks tree */
106 	rn_inithead_internal(&rh->head, rh->rnh_nodes, offset);
107 	rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0);
108 	rh->head.rnh_masks = &rh->rmhead;
109 
110 	/* Save metadata associated with this routing table. */
111 	rh->rib_family = family;
112 	rh->rib_fibnum = fibnum;
113 #ifdef VIMAGE
114 	rh->rib_vnet = curvnet;
115 #endif
116 
117 	tmproutes_init(rh);
118 
119 	/* Init locks */
120 	RIB_LOCK_INIT(rh);
121 
122 	nhops_init_rib(rh);
123 
124 	/* Init subscription system */
125 	rib_init_subscriptions(rh);
126 
127 	/* Finally, set base callbacks */
128 	rh->rnh_addaddr = rn_addroute;
129 	rh->rnh_deladdr = rn_delete;
130 	rh->rnh_matchaddr = rn_match;
131 	rh->rnh_lookup = rn_lookup;
132 	rh->rnh_walktree = rn_walktree;
133 	rh->rnh_walktree_from = rn_walktree_from;
134 
135 	return (rh);
136 }
137 
138 static int
139 rt_freeentry(struct radix_node *rn, void *arg)
140 {
141 	struct radix_head * const rnh = arg;
142 	struct radix_node *x;
143 
144 	x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh);
145 	if (x != NULL)
146 		R_Free(x);
147 	return (0);
148 }
149 
150 void
151 rt_table_destroy(struct rib_head *rh)
152 {
153 
154 	RIB_WLOCK(rh);
155 	rh->rib_dying = true;
156 	RIB_WUNLOCK(rh);
157 
158 #ifdef FIB_ALGO
159 	fib_destroy_rib(rh);
160 #endif
161 
162 	tmproutes_destroy(rh);
163 
164 	rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head);
165 
166 	nhops_destroy_rib(rh);
167 
168 	rib_destroy_subscriptions(rh);
169 
170 	/* Assume table is already empty */
171 	RIB_LOCK_DESTROY(rh);
172 	free(rh, M_RTABLE);
173 }
174 
175 /*
176  * Adds a temporal redirect entry to the routing table.
177  * @fibnum: fib number
178  * @dst: destination to install redirect to
179  * @gateway: gateway to go via
180  * @author: sockaddr of originating router, can be NULL
181  * @ifp: interface to use for the redirected route
182  * @flags: set of flags to add. Allowed: RTF_GATEWAY
183  * @lifetime_sec: time in seconds to expire this redirect.
184  *
185  * Retuns 0 on success, errno otherwise.
186  */
187 int
188 rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway,
189     struct sockaddr *author, struct ifnet *ifp, int flags, int lifetime_sec)
190 {
191 	struct route_nhop_data rnd = { .rnd_weight = RT_DEFAULT_WEIGHT };
192 	struct rib_cmd_info rc;
193 	struct ifaddr *ifa;
194 	int error;
195 
196 	NET_EPOCH_ASSERT();
197 
198 	if (rt_tables_get_rnh(fibnum, dst->sa_family) == NULL)
199 		return (EAFNOSUPPORT);
200 
201 	/* Verify the allowed flag mask. */
202 	KASSERT(((flags & ~(RTF_GATEWAY)) == 0),
203 	    ("invalid redirect flags: %x", flags));
204 	flags |= RTF_HOST | RTF_DYNAMIC;
205 
206 	/* Get the best ifa for the given interface and gateway. */
207 	if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL)
208 		return (ENETUNREACH);
209 
210 	struct nhop_object *nh = nhop_alloc(fibnum, dst->sa_family);
211 	if (nh == NULL)
212 		return (ENOMEM);
213 
214 	nhop_set_gw(nh, gateway, flags & RTF_GATEWAY);
215 	nhop_set_transmit_ifp(nh, ifp);
216 	nhop_set_src(nh, ifa);
217 	nhop_set_pxtype_flag(nh, NHF_HOST);
218 	nhop_set_expire(nh, lifetime_sec + time_uptime);
219 	nhop_set_redirect(nh, true);
220 	rnd.rnd_nhop = nhop_get_nhop(nh, &error);
221 	if (error == 0) {
222 		error = rib_add_route_px(fibnum, dst, -1,
223 		    &rnd, RTM_F_CREATE, &rc);
224 	}
225 
226 	if (error != 0) {
227 		/* TODO: add per-fib redirect stats. */
228 		return (error);
229 	}
230 
231 	RTSTAT_INC(rts_dynamic);
232 
233 	/* Send notification of a route addition to userland. */
234 	struct rt_addrinfo info = {
235 		.rti_info[RTAX_DST] = dst,
236 		.rti_info[RTAX_GATEWAY] = gateway,
237 		.rti_info[RTAX_AUTHOR] = author,
238 	};
239 	rt_missmsg_fib(RTM_REDIRECT, &info, flags | RTF_UP, error, fibnum);
240 
241 	return (0);
242 }
243 
244 /*
245  * Routing table ioctl interface.
246  */
247 int
248 rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
249 {
250 
251 	/*
252 	 * If more ioctl commands are added here, make sure the proper
253 	 * super-user checks are being performed because it is possible for
254 	 * prison-root to make it this far if raw sockets have been enabled
255 	 * in jails.
256 	 */
257 #ifdef INET
258 	/* Multicast goop, grrr... */
259 	return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
260 #else /* INET */
261 	return ENXIO;
262 #endif /* INET */
263 }
264 
265 struct ifaddr *
266 ifa_ifwithroute(int flags, const struct sockaddr *dst,
267     const struct sockaddr *gateway, u_int fibnum)
268 {
269 	struct ifaddr *ifa;
270 
271 	NET_EPOCH_ASSERT();
272 	if ((flags & RTF_GATEWAY) == 0) {
273 		/*
274 		 * If we are adding a route to an interface,
275 		 * and the interface is a pt to pt link
276 		 * we should search for the destination
277 		 * as our clue to the interface.  Otherwise
278 		 * we can use the local address.
279 		 */
280 		ifa = NULL;
281 		if (flags & RTF_HOST)
282 			ifa = ifa_ifwithdstaddr(dst, fibnum);
283 		if (ifa == NULL)
284 			ifa = ifa_ifwithaddr(gateway);
285 	} else {
286 		/*
287 		 * If we are adding a route to a remote net
288 		 * or host, the gateway may still be on the
289 		 * other end of a pt to pt link.
290 		 */
291 		ifa = ifa_ifwithdstaddr(gateway, fibnum);
292 	}
293 	if (ifa == NULL)
294 		ifa = ifa_ifwithnet(gateway, 0, fibnum);
295 	if (ifa == NULL) {
296 		struct nhop_object *nh;
297 
298 		nh = rib_lookup(fibnum, gateway, NHR_NONE, 0);
299 
300 		/*
301 		 * dismiss a gateway that is reachable only
302 		 * through the default router
303 		 */
304 		if ((nh == NULL) || (nh->nh_flags & NHF_DEFAULT))
305 			return (NULL);
306 		ifa = nh->nh_ifa;
307 	}
308 	if (ifa->ifa_addr->sa_family != dst->sa_family) {
309 		struct ifaddr *oifa = ifa;
310 		ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
311 		if (ifa == NULL)
312 			ifa = oifa;
313 	}
314 
315 	return (ifa);
316 }
317 
318 /*
319  * Delete Routes for a Network Interface
320  *
321  * Called for each routing entry via the rnh->rnh_walktree() call above
322  * to delete all route entries referencing a detaching network interface.
323  *
324  * Arguments:
325  *	rt	pointer to rtentry
326  *	nh	pointer to nhop
327  *	arg	argument passed to rnh->rnh_walktree() - detaching interface
328  *
329  * Returns:
330  *	0	successful
331  *	errno	failed - reason indicated
332  */
333 static int
334 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
335 {
336 	struct ifnet	*ifp = arg;
337 
338 	if (nh->nh_ifp != ifp)
339 		return (0);
340 
341 	/*
342 	 * Protect (sorta) against walktree recursion problems
343 	 * with cloned routes
344 	 */
345 	if ((rt->rte_flags & RTF_UP) == 0)
346 		return (0);
347 
348 	return (1);
349 }
350 
351 void
352 rt_flushifroutes(struct ifnet *ifp)
353 {
354 
355 	rib_foreach_table_walk_del(AF_UNSPEC, rt_ifdelroute, ifp);
356 }
357 
358 /*
359  * Tries to extract interface from RTAX_IFP passed in rt_addrinfo.
360  * Interface can be specified ether as interface index (sdl_index) or
361  * the interface name (sdl_data).
362  *
363  * Returns found ifp or NULL
364  */
365 static struct ifnet *
366 info_get_ifp(struct rt_addrinfo *info)
367 {
368 	const struct sockaddr_dl *sdl;
369 
370 	sdl = (const struct sockaddr_dl *)info->rti_info[RTAX_IFP];
371 	if (sdl->sdl_family != AF_LINK)
372 		return (NULL);
373 
374 	if (sdl->sdl_index != 0)
375 		return (ifnet_byindex(sdl->sdl_index));
376 	if (sdl->sdl_nlen > 0) {
377 		char if_name[IF_NAMESIZE];
378 		if (sdl->sdl_nlen + offsetof(struct sockaddr_dl, sdl_data) > sdl->sdl_len)
379 			return (NULL);
380 		if (sdl->sdl_nlen >= IF_NAMESIZE)
381 			return (NULL);
382 		bzero(if_name, sizeof(if_name));
383 		memcpy(if_name, sdl->sdl_data, sdl->sdl_nlen);
384 		return (ifunit(if_name));
385 	}
386 
387 	return (NULL);
388 }
389 
390 /*
391  * Calculates proper ifa/ifp for the cases when gateway AF is different
392  * from dst AF.
393  *
394  * Returns 0 on success.
395  */
396 __noinline static int
397 rt_getifa_family(struct rt_addrinfo *info, uint32_t fibnum)
398 {
399 	if (info->rti_ifp == NULL) {
400 		struct ifaddr *ifa = NULL;
401 		/*
402 		 * No transmit interface specified. Guess it by checking gw sa.
403 		 */
404 		const struct sockaddr *gw = info->rti_info[RTAX_GATEWAY];
405 		ifa = ifa_ifwithroute(RTF_GATEWAY, gw, gw, fibnum);
406 		if (ifa == NULL)
407 			return (ENETUNREACH);
408 		info->rti_ifp = ifa->ifa_ifp;
409 	}
410 
411 	/* Prefer address from outgoing interface */
412 	info->rti_ifa = ifaof_ifpforaddr(info->rti_info[RTAX_DST], info->rti_ifp);
413 #ifdef INET
414 	if (info->rti_ifa == NULL) {
415 		/* Use first found IPv4 address */
416 		bool loopback_ok = info->rti_ifp->if_flags & IFF_LOOPBACK;
417 		info->rti_ifa = (struct ifaddr *)in_findlocal(fibnum, loopback_ok);
418 	}
419 #endif
420 	if (info->rti_ifa == NULL)
421 		return (ENETUNREACH);
422 	return (0);
423 }
424 
425 /*
426  * Fills in rti_ifp and rti_ifa for the provided fib.
427  *
428  * Assume basic consistency checks are executed by callers:
429  * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well.
430  */
431 int
432 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
433 {
434 	const struct sockaddr *dst, *gateway, *ifaaddr;
435 	int error, flags;
436 
437 	dst = info->rti_info[RTAX_DST];
438 	gateway = info->rti_info[RTAX_GATEWAY];
439 	ifaaddr = info->rti_info[RTAX_IFA];
440 	flags = info->rti_flags;
441 
442 	/*
443 	 * ifp may be specified by sockaddr_dl
444 	 * when protocol address is ambiguous.
445 	 */
446 	error = 0;
447 
448 	/* If we have interface specified by RTAX_IFP address, try to use it */
449 	if ((info->rti_ifp == NULL) && (info->rti_info[RTAX_IFP] != NULL))
450 		info->rti_ifp = info_get_ifp(info);
451 	/*
452 	 * If we have source address specified, try to find it
453 	 * TODO: avoid enumerating all ifas on all interfaces.
454 	 */
455 	if (info->rti_ifa == NULL && ifaaddr != NULL)
456 		info->rti_ifa = ifa_ifwithaddr(ifaaddr);
457 	if ((info->rti_ifa == NULL) && ((info->rti_flags & RTF_GATEWAY) != 0) &&
458 	    (gateway->sa_family != dst->sa_family))
459 		return (rt_getifa_family(info, fibnum));
460 	if (info->rti_ifa == NULL) {
461 		const struct sockaddr *sa;
462 
463 		/*
464 		 * Most common use case for the userland-supplied routes.
465 		 *
466 		 * Choose sockaddr to select ifa.
467 		 * -- if ifp is set --
468 		 * Order of preference:
469 		 * 1) IFA address
470 		 * 2) gateway address
471 		 *   Note: for interface routes link-level gateway address
472 		 *     is specified to indicate the interface index without
473 		 *     specifying RTF_GATEWAY. In this case, ignore gateway
474 		 *   Note: gateway AF may be different from dst AF. In this case,
475 		 *   ignore gateway
476 		 * 3) final destination.
477 		 * 4) if all of these fails, try to get at least link-level ifa.
478 		 * -- else --
479 		 * try to lookup gateway or dst in the routing table to get ifa
480 		 */
481 		if (info->rti_info[RTAX_IFA] != NULL)
482 			sa = info->rti_info[RTAX_IFA];
483 		else if ((info->rti_flags & RTF_GATEWAY) != 0 &&
484 		    gateway->sa_family == dst->sa_family)
485 			sa = gateway;
486 		else
487 			sa = dst;
488 		if (info->rti_ifp != NULL) {
489 			info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
490 			/* Case 4 */
491 			if (info->rti_ifa == NULL && gateway != NULL)
492 				info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp);
493 		} else if (dst != NULL && gateway != NULL)
494 			info->rti_ifa = ifa_ifwithroute(flags, dst, gateway,
495 							fibnum);
496 		else if (sa != NULL)
497 			info->rti_ifa = ifa_ifwithroute(flags, sa, sa,
498 							fibnum);
499 	}
500 	if (info->rti_ifa != NULL) {
501 		if (info->rti_ifp == NULL)
502 			info->rti_ifp = info->rti_ifa->ifa_ifp;
503 	} else
504 		error = ENETUNREACH;
505 	return (error);
506 }
507 
508 void
509 rt_updatemtu(struct ifnet *ifp)
510 {
511 	struct rib_head *rnh;
512 	int mtu;
513 	int i, j;
514 
515 	/*
516 	 * Try to update rt_mtu for all routes using this interface
517 	 * Unfortunately the only way to do this is to traverse all
518 	 * routing tables in all fibs/domains.
519 	 */
520 	for (i = 1; i <= AF_MAX; i++) {
521 		mtu = if_getmtu_family(ifp, i);
522 		for (j = 0; j < rt_numfibs; j++) {
523 			rnh = rt_tables_get_rnh(j, i);
524 			if (rnh == NULL)
525 				continue;
526 			nhops_update_ifmtu(rnh, ifp, mtu);
527 		}
528 	}
529 }
530 
531 #if 0
532 int p_sockaddr(char *buf, int buflen, struct sockaddr *s);
533 int rt_print(char *buf, int buflen, struct rtentry *rt);
534 
535 int
536 p_sockaddr(char *buf, int buflen, struct sockaddr *s)
537 {
538 	void *paddr = NULL;
539 
540 	switch (s->sa_family) {
541 	case AF_INET:
542 		paddr = &((struct sockaddr_in *)s)->sin_addr;
543 		break;
544 	case AF_INET6:
545 		paddr = &((struct sockaddr_in6 *)s)->sin6_addr;
546 		break;
547 	}
548 
549 	if (paddr == NULL)
550 		return (0);
551 
552 	if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL)
553 		return (0);
554 
555 	return (strlen(buf));
556 }
557 
558 int
559 rt_print(char *buf, int buflen, struct rtentry *rt)
560 {
561 	struct sockaddr *addr, *mask;
562 	int i = 0;
563 
564 	addr = rt_key(rt);
565 	mask = rt_mask(rt);
566 
567 	i = p_sockaddr(buf, buflen, addr);
568 	if (!(rt->rt_flags & RTF_HOST)) {
569 		buf[i++] = '/';
570 		i += p_sockaddr(buf + i, buflen - i, mask);
571 	}
572 
573 	if (rt->rt_flags & RTF_GATEWAY) {
574 		buf[i++] = '>';
575 		i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa);
576 	}
577 
578 	return (i);
579 }
580 #endif
581 
582 void
583 rt_maskedcopy(const struct sockaddr *src, struct sockaddr *dst,
584     const struct sockaddr *netmask)
585 {
586 	const u_char *cp1 = (const u_char *)src;
587 	u_char *cp2 = (u_char *)dst;
588 	const u_char *cp3 = (const u_char *)netmask;
589 	u_char *cplim = cp2 + *cp3;
590 	u_char *cplim2 = cp2 + *cp1;
591 
592 	*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
593 	cp3 += 2;
594 	if (cplim > cplim2)
595 		cplim = cplim2;
596 	while (cp2 < cplim)
597 		*cp2++ = *cp1++ & *cp3++;
598 	if (cp2 < cplim2)
599 		bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
600 }
601 
602 /*
603  * Announce interface address arrival/withdraw
604  * Returns 0 on success.
605  */
606 int
607 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
608 {
609 #if defined(INET) || defined(INET6)
610 	struct sockaddr *sa = ifa->ifa_addr;
611 	struct ifnet *ifp = ifa->ifa_ifp;
612 #endif
613 
614 	KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
615 	    ("unexpected cmd %d", cmd));
616 	KASSERT((fibnum >= 0 && fibnum < rt_numfibs),
617 	    ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
618 
619 	EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd);
620 
621 #ifdef INET
622 	if (sa->sa_family == AF_INET) {
623 		char addrstr[INET_ADDRSTRLEN];
624 		char strbuf[INET_ADDRSTRLEN + 12];
625 
626 		inet_ntoa_r(((struct sockaddr_in *)sa)->sin_addr, addrstr);
627 		snprintf(strbuf, sizeof(strbuf), "address=%s", addrstr);
628 		devctl_notify("IFNET", ifp->if_xname,
629 		    (cmd == RTM_ADD) ? "ADDR_ADD" : "ADDR_DEL", strbuf);
630 	}
631 #endif
632 #ifdef INET6
633 	if (sa->sa_family == AF_INET6) {
634 		char addrstr[INET6_ADDRSTRLEN];
635 		char strbuf[INET6_ADDRSTRLEN + 12];
636 
637 		ip6_sprintf(addrstr, IFA_IN6(ifa));
638 		snprintf(strbuf, sizeof(strbuf), "address=%s", addrstr);
639 		devctl_notify("IFNET", ifp->if_xname,
640 		    (cmd == RTM_ADD) ? "ADDR_ADD" : "ADDR_DEL", strbuf);
641 	}
642 #endif
643 
644 	if (V_rt_add_addr_allfibs)
645 		fibnum = RT_ALL_FIBS;
646 	return (rtsock_addrmsg(cmd, ifa, fibnum));
647 }
648 
649 /*
650  * Announce kernel-originated route addition/removal to rtsock based on @rt data.
651  * cmd: RTM_ cmd
652  * @rt: valid rtentry
653  * @nh: nhop object to announce
654  * @fibnum: fib id or RT_ALL_FIBS
655  *
656  * Returns 0 on success.
657  */
658 int
659 rt_routemsg(int cmd, struct rtentry *rt, struct nhop_object *nh,
660     int fibnum)
661 {
662 
663 	KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
664 	    ("unexpected cmd %d", cmd));
665 
666 	KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
667 	    ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
668 
669 	KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
670 
671 	return (rtsock_routemsg(cmd, rt, nh, fibnum));
672 }
673 
674 /*
675  * Announce kernel-originated route addition/removal to rtsock based on @rt data.
676  * cmd: RTM_ cmd
677  * @info: addrinfo structure with valid data.
678  * @fibnum: fib id or RT_ALL_FIBS
679  *
680  * Returns 0 on success.
681  */
682 int
683 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
684 {
685 
686 	KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE,
687 	    ("unexpected cmd %d", cmd));
688 
689 	KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
690 	    ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
691 
692 	KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__));
693 
694 	return (rtsock_routemsg_info(cmd, info, fibnum));
695 }
696