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/domain.h>
54 #include <sys/eventhandler.h>
55 #include <sys/kernel.h>
56 #include <sys/lock.h>
57 #include <sys/rmlock.h>
58
59 #include <net/if.h>
60 #include <net/if_var.h>
61 #include <net/if_dl.h>
62 #include <net/route.h>
63 #include <net/route/route_ctl.h>
64 #include <net/route/route_var.h>
65 #include <net/route/nhop.h>
66 #include <net/vnet.h>
67
68 #include <netinet/in.h>
69 #include <netinet/ip_mroute.h>
70
71 VNET_PCPUSTAT_DEFINE(struct rtstat, rtstat);
72
73 VNET_PCPUSTAT_SYSINIT(rtstat);
74 #ifdef VIMAGE
75 VNET_PCPUSTAT_SYSUNINIT(rtstat);
76 #endif
77
78 EVENTHANDLER_LIST_DEFINE(rt_addrmsg);
79
80 static int rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *,
81 void *arg);
82 static int rt_exportinfo(struct rtentry *rt, struct nhop_object *nh,
83 struct rt_addrinfo *info, int flags);
84
85 /*
86 * route initialization must occur before ip6_init2(), which happenas at
87 * SI_ORDER_MIDDLE.
88 */
89 static void
route_init(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 *
rt_table_init(int offset,int family,u_int fibnum)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
rt_freeentry(struct radix_node * rn,void * arg)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
rt_table_destroy(struct rib_head * rh)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
rib_add_redirect(u_int fibnum,struct sockaddr * dst,struct sockaddr * gateway,struct sockaddr * author,struct ifnet * ifp,int flags,int lifetime_sec)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 rib_cmd_info rc;
192 int error;
193 struct rt_addrinfo info;
194 struct rt_metrics rti_rmx;
195 struct ifaddr *ifa;
196
197 NET_EPOCH_ASSERT();
198
199 if (rt_tables_get_rnh(fibnum, dst->sa_family) == NULL)
200 return (EAFNOSUPPORT);
201
202 /* Verify the allowed flag mask. */
203 KASSERT(((flags & ~(RTF_GATEWAY)) == 0),
204 ("invalid redirect flags: %x", flags));
205 flags |= RTF_HOST | RTF_DYNAMIC;
206
207 /* Get the best ifa for the given interface and gateway. */
208 if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL)
209 return (ENETUNREACH);
210 ifa_ref(ifa);
211
212 bzero(&info, sizeof(info));
213 info.rti_info[RTAX_DST] = dst;
214 info.rti_info[RTAX_GATEWAY] = gateway;
215 info.rti_ifa = ifa;
216 info.rti_ifp = ifp;
217 info.rti_flags = flags;
218
219 /* Setup route metrics to define expire time. */
220 bzero(&rti_rmx, sizeof(rti_rmx));
221 /* Set expire time as absolute. */
222 rti_rmx.rmx_expire = lifetime_sec + time_second;
223 info.rti_mflags |= RTV_EXPIRE;
224 info.rti_rmx = &rti_rmx;
225
226 error = rib_action(fibnum, RTM_ADD, &info, &rc);
227 ifa_free(ifa);
228
229 if (error != 0) {
230 /* TODO: add per-fib redirect stats. */
231 return (error);
232 }
233
234 RTSTAT_INC(rts_dynamic);
235
236 /* Send notification of a route addition to userland. */
237 bzero(&info, sizeof(info));
238 info.rti_info[RTAX_DST] = dst;
239 info.rti_info[RTAX_GATEWAY] = gateway;
240 info.rti_info[RTAX_AUTHOR] = author;
241 rt_missmsg_fib(RTM_REDIRECT, &info, flags | RTF_UP, error, fibnum);
242
243 return (0);
244 }
245
246 /*
247 * Routing table ioctl interface.
248 */
249 int
rtioctl_fib(u_long req,caddr_t data,u_int fibnum)250 rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
251 {
252
253 /*
254 * If more ioctl commands are added here, make sure the proper
255 * super-user checks are being performed because it is possible for
256 * prison-root to make it this far if raw sockets have been enabled
257 * in jails.
258 */
259 #ifdef INET
260 /* Multicast goop, grrr... */
261 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
262 #else /* INET */
263 return ENXIO;
264 #endif /* INET */
265 }
266
267 struct ifaddr *
ifa_ifwithroute(int flags,const struct sockaddr * dst,const struct sockaddr * gateway,u_int fibnum)268 ifa_ifwithroute(int flags, const struct sockaddr *dst,
269 const struct sockaddr *gateway, u_int fibnum)
270 {
271 struct ifaddr *ifa;
272
273 NET_EPOCH_ASSERT();
274 if ((flags & RTF_GATEWAY) == 0) {
275 /*
276 * If we are adding a route to an interface,
277 * and the interface is a pt to pt link
278 * we should search for the destination
279 * as our clue to the interface. Otherwise
280 * we can use the local address.
281 */
282 ifa = NULL;
283 if (flags & RTF_HOST)
284 ifa = ifa_ifwithdstaddr(dst, fibnum);
285 if (ifa == NULL)
286 ifa = ifa_ifwithaddr(gateway);
287 } else {
288 /*
289 * If we are adding a route to a remote net
290 * or host, the gateway may still be on the
291 * other end of a pt to pt link.
292 */
293 ifa = ifa_ifwithdstaddr(gateway, fibnum);
294 }
295 if (ifa == NULL)
296 ifa = ifa_ifwithnet(gateway, 0, fibnum);
297 if (ifa == NULL) {
298 struct nhop_object *nh;
299
300 nh = rib_lookup(fibnum, gateway, NHR_NONE, 0);
301
302 /*
303 * dismiss a gateway that is reachable only
304 * through the default router
305 */
306 if ((nh == NULL) || (nh->nh_flags & NHF_DEFAULT))
307 return (NULL);
308 ifa = nh->nh_ifa;
309 }
310 if (ifa->ifa_addr->sa_family != dst->sa_family) {
311 struct ifaddr *oifa = ifa;
312 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
313 if (ifa == NULL)
314 ifa = oifa;
315 }
316
317 return (ifa);
318 }
319
320 /*
321 * Copy most of @rt data into @info.
322 *
323 * If @flags contains NHR_COPY, copies dst,netmask and gw to the
324 * pointers specified by @info structure. Assume such pointers
325 * are zeroed sockaddr-like structures with sa_len field initialized
326 * to reflect size of the provided buffer. if no NHR_COPY is specified,
327 * point dst,netmask and gw @info fields to appropriate @rt values.
328 *
329 * if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa.
330 *
331 * Returns 0 on success.
332 */
333 static int
rt_exportinfo(struct rtentry * rt,struct nhop_object * nh,struct rt_addrinfo * info,int flags)334 rt_exportinfo(struct rtentry *rt, struct nhop_object *nh,
335 struct rt_addrinfo *info, int flags)
336 {
337 struct rt_metrics *rmx;
338 struct sockaddr *src, *dst;
339 int sa_len;
340
341 if (flags & NHR_COPY) {
342 /* Copy destination if dst is non-zero */
343 src = rt_key(rt);
344 dst = info->rti_info[RTAX_DST];
345 sa_len = src->sa_len;
346 if (dst != NULL) {
347 if (src->sa_len > dst->sa_len)
348 return (ENOMEM);
349 memcpy(dst, src, src->sa_len);
350 info->rti_addrs |= RTA_DST;
351 }
352
353 /* Copy mask if set && dst is non-zero */
354 src = rt_mask(rt);
355 dst = info->rti_info[RTAX_NETMASK];
356 if (src != NULL && dst != NULL) {
357 /*
358 * Radix stores different value in sa_len,
359 * assume rt_mask() to have the same length
360 * as rt_key()
361 */
362 if (sa_len > dst->sa_len)
363 return (ENOMEM);
364 memcpy(dst, src, src->sa_len);
365 info->rti_addrs |= RTA_NETMASK;
366 }
367
368 /* Copy gateway is set && dst is non-zero */
369 src = &nh->gw_sa;
370 dst = info->rti_info[RTAX_GATEWAY];
371 if ((nhop_get_rtflags(nh) & RTF_GATEWAY) &&
372 src != NULL && dst != NULL) {
373 if (src->sa_len > dst->sa_len)
374 return (ENOMEM);
375 memcpy(dst, src, src->sa_len);
376 info->rti_addrs |= RTA_GATEWAY;
377 }
378 } else {
379 info->rti_info[RTAX_DST] = rt_key(rt);
380 info->rti_addrs |= RTA_DST;
381 if (rt_mask(rt) != NULL) {
382 info->rti_info[RTAX_NETMASK] = rt_mask(rt);
383 info->rti_addrs |= RTA_NETMASK;
384 }
385 if (nhop_get_rtflags(nh) & RTF_GATEWAY) {
386 info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
387 info->rti_addrs |= RTA_GATEWAY;
388 }
389 }
390
391 rmx = info->rti_rmx;
392 if (rmx != NULL) {
393 info->rti_mflags |= RTV_MTU;
394 rmx->rmx_mtu = nh->nh_mtu;
395 }
396
397 info->rti_flags = rt->rte_flags | nhop_get_rtflags(nh);
398 info->rti_ifp = nh->nh_ifp;
399 info->rti_ifa = nh->nh_ifa;
400 if (flags & NHR_REF) {
401 if_ref(info->rti_ifp);
402 ifa_ref(info->rti_ifa);
403 }
404
405 return (0);
406 }
407
408 /*
409 * Lookups up route entry for @dst in RIB database for fib @fibnum.
410 * Exports entry data to @info using rt_exportinfo().
411 *
412 * If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa.
413 * All references can be released later by calling rib_free_info().
414 *
415 * Returns 0 on success.
416 * Returns ENOENT for lookup failure, ENOMEM for export failure.
417 */
418 int
rib_lookup_info(uint32_t fibnum,const struct sockaddr * dst,uint32_t flags,uint32_t flowid,struct rt_addrinfo * info)419 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
420 uint32_t flowid, struct rt_addrinfo *info)
421 {
422 RIB_RLOCK_TRACKER;
423 struct rib_head *rh;
424 struct radix_node *rn;
425 struct rtentry *rt;
426 struct nhop_object *nh;
427 int error;
428
429 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum"));
430 rh = rt_tables_get_rnh(fibnum, dst->sa_family);
431 if (rh == NULL)
432 return (ENOENT);
433
434 RIB_RLOCK(rh);
435 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head);
436 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
437 rt = RNTORT(rn);
438 nh = nhop_select(rt->rt_nhop, flowid);
439 /* Ensure route & ifp is UP */
440 if (RT_LINK_IS_UP(nh->nh_ifp)) {
441 flags = (flags & NHR_REF) | NHR_COPY;
442 error = rt_exportinfo(rt, nh, info, flags);
443 RIB_RUNLOCK(rh);
444
445 return (error);
446 }
447 }
448 RIB_RUNLOCK(rh);
449
450 return (ENOENT);
451 }
452
453 /*
454 * Releases all references acquired by rib_lookup_info() when
455 * called with NHR_REF flags.
456 */
457 void
rib_free_info(struct rt_addrinfo * info)458 rib_free_info(struct rt_addrinfo *info)
459 {
460
461 ifa_free(info->rti_ifa);
462 if_rele(info->rti_ifp);
463 }
464
465 /*
466 * Delete Routes for a Network Interface
467 *
468 * Called for each routing entry via the rnh->rnh_walktree() call above
469 * to delete all route entries referencing a detaching network interface.
470 *
471 * Arguments:
472 * rt pointer to rtentry
473 * nh pointer to nhop
474 * arg argument passed to rnh->rnh_walktree() - detaching interface
475 *
476 * Returns:
477 * 0 successful
478 * errno failed - reason indicated
479 */
480 static int
rt_ifdelroute(const struct rtentry * rt,const struct nhop_object * nh,void * arg)481 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
482 {
483 struct ifnet *ifp = arg;
484
485 if (nh->nh_ifp != ifp)
486 return (0);
487
488 /*
489 * Protect (sorta) against walktree recursion problems
490 * with cloned routes
491 */
492 if ((rt->rte_flags & RTF_UP) == 0)
493 return (0);
494
495 return (1);
496 }
497
498 void
rt_flushifroutes(struct ifnet * ifp)499 rt_flushifroutes(struct ifnet *ifp)
500 {
501
502 rib_foreach_table_walk_del(AF_UNSPEC, rt_ifdelroute, ifp);
503 }
504
505 /*
506 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined,
507 * it will be referenced so the caller must free it.
508 *
509 * Assume basic consistency checks are executed by callers:
510 * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well.
511 */
512 int
rt_getifa_fib(struct rt_addrinfo * info,u_int fibnum)513 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
514 {
515 const struct sockaddr *dst, *gateway, *ifpaddr, *ifaaddr;
516 struct epoch_tracker et;
517 int needref, error, flags;
518
519 dst = info->rti_info[RTAX_DST];
520 gateway = info->rti_info[RTAX_GATEWAY];
521 ifpaddr = info->rti_info[RTAX_IFP];
522 ifaaddr = info->rti_info[RTAX_IFA];
523 flags = info->rti_flags;
524
525 /*
526 * ifp may be specified by sockaddr_dl
527 * when protocol address is ambiguous.
528 */
529 error = 0;
530 needref = (info->rti_ifa == NULL);
531 NET_EPOCH_ENTER(et);
532
533 /* If we have interface specified by the ifindex in the address, use it */
534 if (info->rti_ifp == NULL && ifpaddr != NULL &&
535 ifpaddr->sa_family == AF_LINK) {
536 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)ifpaddr;
537 if (sdl->sdl_index != 0)
538 info->rti_ifp = ifnet_byindex(sdl->sdl_index);
539 }
540 /*
541 * If we have source address specified, try to find it
542 * TODO: avoid enumerating all ifas on all interfaces.
543 */
544 if (info->rti_ifa == NULL && ifaaddr != NULL)
545 info->rti_ifa = ifa_ifwithaddr(ifaaddr);
546 if (info->rti_ifa == NULL) {
547 const struct sockaddr *sa;
548
549 /*
550 * Most common use case for the userland-supplied routes.
551 *
552 * Choose sockaddr to select ifa.
553 * -- if ifp is set --
554 * Order of preference:
555 * 1) IFA address
556 * 2) gateway address
557 * Note: for interface routes link-level gateway address
558 * is specified to indicate the interface index without
559 * specifying RTF_GATEWAY. In this case, ignore gateway
560 * Note: gateway AF may be different from dst AF. In this case,
561 * ignore gateway
562 * 3) final destination.
563 * 4) if all of these fails, try to get at least link-level ifa.
564 * -- else --
565 * try to lookup gateway or dst in the routing table to get ifa
566 */
567 if (info->rti_info[RTAX_IFA] != NULL)
568 sa = info->rti_info[RTAX_IFA];
569 else if ((info->rti_flags & RTF_GATEWAY) != 0 &&
570 gateway->sa_family == dst->sa_family)
571 sa = gateway;
572 else
573 sa = dst;
574 if (info->rti_ifp != NULL) {
575 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
576 /* Case 4 */
577 if (info->rti_ifa == NULL && gateway != NULL)
578 info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp);
579 } else if (dst != NULL && gateway != NULL)
580 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway,
581 fibnum);
582 else if (sa != NULL)
583 info->rti_ifa = ifa_ifwithroute(flags, sa, sa,
584 fibnum);
585 }
586 if (needref && info->rti_ifa != NULL) {
587 if (info->rti_ifp == NULL)
588 info->rti_ifp = info->rti_ifa->ifa_ifp;
589 ifa_ref(info->rti_ifa);
590 } else
591 error = ENETUNREACH;
592 NET_EPOCH_EXIT(et);
593 return (error);
594 }
595
596 void
rt_updatemtu(struct ifnet * ifp)597 rt_updatemtu(struct ifnet *ifp)
598 {
599 struct rib_head *rnh;
600 int mtu;
601 int i, j;
602
603 /*
604 * Try to update rt_mtu for all routes using this interface
605 * Unfortunately the only way to do this is to traverse all
606 * routing tables in all fibs/domains.
607 */
608 for (i = 1; i <= AF_MAX; i++) {
609 mtu = if_getmtu_family(ifp, i);
610 for (j = 0; j < rt_numfibs; j++) {
611 rnh = rt_tables_get_rnh(j, i);
612 if (rnh == NULL)
613 continue;
614 nhops_update_ifmtu(rnh, ifp, mtu);
615 }
616 }
617 }
618
619 #if 0
620 int p_sockaddr(char *buf, int buflen, struct sockaddr *s);
621 int rt_print(char *buf, int buflen, struct rtentry *rt);
622
623 int
624 p_sockaddr(char *buf, int buflen, struct sockaddr *s)
625 {
626 void *paddr = NULL;
627
628 switch (s->sa_family) {
629 case AF_INET:
630 paddr = &((struct sockaddr_in *)s)->sin_addr;
631 break;
632 case AF_INET6:
633 paddr = &((struct sockaddr_in6 *)s)->sin6_addr;
634 break;
635 }
636
637 if (paddr == NULL)
638 return (0);
639
640 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL)
641 return (0);
642
643 return (strlen(buf));
644 }
645
646 int
647 rt_print(char *buf, int buflen, struct rtentry *rt)
648 {
649 struct sockaddr *addr, *mask;
650 int i = 0;
651
652 addr = rt_key(rt);
653 mask = rt_mask(rt);
654
655 i = p_sockaddr(buf, buflen, addr);
656 if (!(rt->rt_flags & RTF_HOST)) {
657 buf[i++] = '/';
658 i += p_sockaddr(buf + i, buflen - i, mask);
659 }
660
661 if (rt->rt_flags & RTF_GATEWAY) {
662 buf[i++] = '>';
663 i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa);
664 }
665
666 return (i);
667 }
668 #endif
669
670 void
rt_maskedcopy(struct sockaddr * src,struct sockaddr * dst,struct sockaddr * netmask)671 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask)
672 {
673 u_char *cp1 = (u_char *)src;
674 u_char *cp2 = (u_char *)dst;
675 u_char *cp3 = (u_char *)netmask;
676 u_char *cplim = cp2 + *cp3;
677 u_char *cplim2 = cp2 + *cp1;
678
679 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
680 cp3 += 2;
681 if (cplim > cplim2)
682 cplim = cplim2;
683 while (cp2 < cplim)
684 *cp2++ = *cp1++ & *cp3++;
685 if (cp2 < cplim2)
686 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
687 }
688
689 /*
690 * Announce interface address arrival/withdraw
691 * Returns 0 on success.
692 */
693 int
rt_addrmsg(int cmd,struct ifaddr * ifa,int fibnum)694 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
695 {
696
697 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
698 ("unexpected cmd %d", cmd));
699 KASSERT((fibnum >= 0 && fibnum < rt_numfibs),
700 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
701
702 EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd);
703
704 if (V_rt_add_addr_allfibs)
705 fibnum = RT_ALL_FIBS;
706 return (rtsock_addrmsg(cmd, ifa, fibnum));
707 }
708
709 /*
710 * Announce kernel-originated route addition/removal to rtsock based on @rt data.
711 * cmd: RTM_ cmd
712 * @rt: valid rtentry
713 * @nh: nhop object to announce
714 * @fibnum: fib id or RT_ALL_FIBS
715 *
716 * Returns 0 on success.
717 */
718 int
rt_routemsg(int cmd,struct rtentry * rt,struct nhop_object * nh,int fibnum)719 rt_routemsg(int cmd, struct rtentry *rt, struct nhop_object *nh,
720 int fibnum)
721 {
722
723 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
724 ("unexpected cmd %d", cmd));
725
726 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
727 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
728
729 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
730
731 return (rtsock_routemsg(cmd, rt, nh, fibnum));
732 }
733
734 /*
735 * Announce kernel-originated route addition/removal to rtsock based on @rt data.
736 * cmd: RTM_ cmd
737 * @info: addrinfo structure with valid data.
738 * @fibnum: fib id or RT_ALL_FIBS
739 *
740 * Returns 0 on success.
741 */
742 int
rt_routemsg_info(int cmd,struct rt_addrinfo * info,int fibnum)743 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
744 {
745
746 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE,
747 ("unexpected cmd %d", cmd));
748
749 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
750 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
751
752 KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__));
753
754 return (rtsock_routemsg_info(cmd, info, fibnum));
755 }
756