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routed(8): Remove SGI specific code.
[dragonfly.git] / sbin / routed / if.c
blob218a7515a3267eec04555ae5c1239b621e321b94
1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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 * $FreeBSD: src/sbin/routed/if.c,v 1.6.2.1 2000/08/14 17:00:03 sheldonh Exp $
30 */
31
32 #include "defs.h"
33 #include "pathnames.h"
34
35 #if !defined(__NetBSD__)
36 static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93";
37 #elif defined(__NetBSD__)
38 #include <sys/cdefs.h>
39 __RCSID("$NetBSD$");
40 #endif
41
42 struct interface *ifnet; /* all interfaces */
43
44 /* hash table for all interfaces, big enough to tolerate ridiculous
45 * numbers of IP aliases. Crazy numbers of aliases such as 7000
46 * still will not do well, but not just in looking up interfaces
47 * by name or address.
48 */
49 #define AHASH_LEN 211 /* must be prime */
50 #define AHASH(a) &ahash_tbl[(a)%AHASH_LEN]
51 struct interface *ahash_tbl[AHASH_LEN];
52
53 #define BHASH_LEN 211 /* must be prime */
54 #define BHASH(a) &bhash_tbl[(a)%BHASH_LEN]
55 struct interface *bhash_tbl[BHASH_LEN];
56
57 struct interface *remote_if; /* remote interfaces */
58
59 /* hash for physical interface names.
60 * Assume there are never more 100 or 200 real interfaces, and that
61 * aliases are put on the end of the hash chains.
62 */
63 #define NHASH_LEN 97
64 struct interface *nhash_tbl[NHASH_LEN];
65
66 int tot_interfaces; /* # of remote and local interfaces */
67 int rip_interfaces; /* # of interfaces doing RIP */
68 int foundloopback; /* valid flag for loopaddr */
69 naddr loopaddr; /* our address on loopback */
70 struct rt_spare loop_rts;
71
72 struct timeval ifinit_timer;
73 static struct timeval last_ifinit;
74 #define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \
75 && last_ifinit.tv_usec == now.tv_usec \
76 && timercmp(&ifinit_timer, &now, >))
77
78 int have_ripv1_out; /* have a RIPv1 interface */
79 int have_ripv1_in;
80
81
82 static struct interface**
83 nhash(char *p)
84 {
85 u_int i;
86
87 for (i = 0; *p != '\0'; p++) {
88 i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1);
89 i ^= *p;
90 }
91 return &nhash_tbl[i % NHASH_LEN];
92 }
93
94
95 /* Link a new interface into the lists and hash tables.
96 */
97 void
98 if_link(struct interface *ifp)
99 {
100 struct interface **hifp;
101
102 ifp->int_prev = &ifnet;
103 ifp->int_next = ifnet;
104 if (ifnet != NULL)
105 ifnet->int_prev = &ifp->int_next;
106 ifnet = ifp;
107
108 hifp = AHASH(ifp->int_addr);
109 ifp->int_ahash_prev = hifp;
110 if ((ifp->int_ahash = *hifp) != NULL)
111 (*hifp)->int_ahash_prev = &ifp->int_ahash;
112 *hifp = ifp;
113
114 if (ifp->int_if_flags & IFF_BROADCAST) {
115 hifp = BHASH(ifp->int_brdaddr);
116 ifp->int_bhash_prev = hifp;
117 if ((ifp->int_bhash = *hifp) != NULL)
118 (*hifp)->int_bhash_prev = &ifp->int_bhash;
119 *hifp = ifp;
120 }
121
122 if (ifp->int_state & IS_REMOTE) {
123 ifp->int_rlink_prev = &remote_if;
124 ifp->int_rlink = remote_if;
125 if (remote_if != NULL)
126 remote_if->int_rlink_prev = &ifp->int_rlink;
127 remote_if = ifp;
128 }
129
130 hifp = nhash(ifp->int_name);
131 if (ifp->int_state & IS_ALIAS) {
132 /* put aliases on the end of the hash chain */
133 while (*hifp != NULL)
134 hifp = &(*hifp)->int_nhash;
135 }
136 ifp->int_nhash_prev = hifp;
137 if ((ifp->int_nhash = *hifp) != NULL)
138 (*hifp)->int_nhash_prev = &ifp->int_nhash;
139 *hifp = ifp;
140 }
141
142
143 /* Find the interface with an address
144 */
145 struct interface *
146 ifwithaddr(naddr addr,
147 int bcast, /* notice IFF_BROADCAST address */
148 int remote) /* include IS_REMOTE interfaces */
149 {
150 struct interface *ifp, *possible = NULL;
151
152 remote = (remote == 0) ? IS_REMOTE : 0;
153
154 for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) {
155 if (ifp->int_addr != addr)
156 continue;
157 if ((ifp->int_state & remote) != 0)
158 continue;
159 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
160 return ifp;
161 possible = ifp;
162 }
163
164 if (possible || !bcast)
165 return possible;
166
167 for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) {
168 if (ifp->int_brdaddr != addr)
169 continue;
170 if ((ifp->int_state & remote) != 0)
171 continue;
172 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
173 return ifp;
174 possible = ifp;
175 }
176
177 return possible;
178 }
179
180
181 /* find the interface with a name
182 */
183 struct interface *
184 ifwithname(char *name, /* "ec0" or whatever */
185 naddr addr) /* 0 or network address */
186 {
187 struct interface *ifp;
188
189 for (;;) {
190 for (ifp = *nhash(name); ifp != NULL; ifp = ifp->int_nhash) {
191 /* If the network address is not specified,
192 * ignore any alias interfaces. Otherwise, look
193 * for the interface with the target name and address.
194 */
195 if (!strcmp(ifp->int_name, name)
196 && ((addr == 0 && !(ifp->int_state & IS_ALIAS))
197 || (ifp->int_addr == addr)))
198 return ifp;
199 }
200
201 /* If there is no known interface, maybe there is a
202 * new interface. So just once look for new interfaces.
203 */
204 if (IF_RESCAN_DELAY())
205 return 0;
206 ifinit();
207 }
208 }
209
210
211 struct interface *
212 ifwithindex(u_short idx, int rescan_ok)
213 {
214 struct interface *ifp;
215
216 for (;;) {
217 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) {
218 if (ifp->int_index == idx)
219 return ifp;
220 }
221
222 /* If there is no known interface, maybe there is a
223 * new interface. So just once look for new interfaces.
224 */
225 if (!rescan_ok
226 || IF_RESCAN_DELAY())
227 return 0;
228 ifinit();
229 }
230 }
231
232
233 /* Find an interface from which the specified address
234 * should have come from. Used for figuring out which
235 * interface a packet came in on.
236 */
237 struct interface *
238 iflookup(naddr addr)
239 {
240 struct interface *ifp, *maybe;
241
242 maybe = NULL;
243 for (;;) {
244 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
245 if (ifp->int_if_flags & IFF_POINTOPOINT) {
246 /* finished with a match */
247 if (ifp->int_dstaddr == addr)
248 return ifp;
249
250 } else {
251 /* finished with an exact match */
252 if (ifp->int_addr == addr)
253 return ifp;
254
255 /* Look for the longest approximate match.
256 */
257 if (on_net(addr, ifp->int_net, ifp->int_mask)
258 && (maybe == NULL
259 || ifp->int_mask > maybe->int_mask))
260 maybe = ifp;
261 }
262 }
263
264 if (maybe != NULL
265 || IF_RESCAN_DELAY())
266 return maybe;
267
268 /* If there is no known interface, maybe there is a
269 * new interface. So just once look for new interfaces.
270 */
271 ifinit();
272 }
273 }
274
275
276 /* Return the classical netmask for an IP address.
277 */
278 naddr /* host byte order */
279 std_mask(naddr addr) /* network byte order */
280 {
281 addr = ntohl(addr); /* was a host, not a network */
282
283 if (addr == 0) /* default route has mask 0 */
284 return 0;
285 if (IN_CLASSA(addr))
286 return IN_CLASSA_NET;
287 if (IN_CLASSB(addr))
288 return IN_CLASSB_NET;
289 return IN_CLASSC_NET;
290 }
291
292
293 /* Find the netmask that would be inferred by RIPv1 listeners
294 * on the given interface for a given network.
295 * If no interface is specified, look for the best fitting interface.
296 */
297 naddr
298 ripv1_mask_net(naddr addr, /* in network byte order */
299 struct interface *ifp) /* as seen on this interface */
300 {
301 struct r1net *r1p;
302 naddr mask = 0;
303
304 if (addr == 0) /* default always has 0 mask */
305 return mask;
306
307 if (ifp != NULL && ifp->int_ripv1_mask != HOST_MASK) {
308 /* If the target network is that of the associated interface
309 * on which it arrived, then use the netmask of the interface.
310 */
311 if (on_net(addr, ifp->int_net, ifp->int_std_mask))
312 mask = ifp->int_ripv1_mask;
313
314 } else {
315 /* Examine all interfaces, and if it the target seems
316 * to have the same network number of an interface, use the
317 * netmask of that interface. If there is more than one
318 * such interface, prefer the interface with the longest
319 * match.
320 */
321 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) {
322 if (on_net(addr, ifp->int_std_net, ifp->int_std_mask)
323 && ifp->int_ripv1_mask > mask
324 && ifp->int_ripv1_mask != HOST_MASK)
325 mask = ifp->int_ripv1_mask;
326 }
327
328 }
329
330 /* check special definitions */
331 if (mask == 0) {
332 for (r1p = r1nets; r1p != NULL; r1p = r1p->r1net_next) {
333 if (on_net(addr, r1p->r1net_net, r1p->r1net_match)
334 && r1p->r1net_mask > mask)
335 mask = r1p->r1net_mask;
336 }
337
338 /* Otherwise, make the classic A/B/C guess.
339 */
340 if (mask == 0)
341 mask = std_mask(addr);
342 }
343
344 return mask;
345 }
346
347
348 naddr
349 ripv1_mask_host(naddr addr, /* in network byte order */
350 struct interface *ifp) /* as seen on this interface */
351 {
352 naddr mask = ripv1_mask_net(addr, ifp);
353
354
355 /* If the computed netmask does not mask the address,
356 * then assume it is a host address
357 */
358 if ((ntohl(addr) & ~mask) != 0)
359 mask = HOST_MASK;
360 return mask;
361 }
362
363
364 /* See if a IP address looks reasonable as a destination
365 */
366 int /* 0=bad */
367 check_dst(naddr addr)
368 {
369 addr = ntohl(addr);
370
371 if (IN_CLASSA(addr)) {
372 if (addr == 0)
373 return 1; /* default */
374
375 addr >>= IN_CLASSA_NSHIFT;
376 return (addr != 0 && addr != IN_LOOPBACKNET);
377 }
378
379 return (IN_CLASSB(addr) || IN_CLASSC(addr));
380 }
381
382
383 /* See a new interface duplicates an existing interface.
384 */
385 struct interface *
386 check_dup(naddr addr, /* IP address, so network byte order */
387 naddr dstaddr, /* ditto */
388 naddr mask, /* mask, so host byte order */
389 int if_flags)
390 {
391 struct interface *ifp;
392
393 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) {
394 if (ifp->int_mask != mask)
395 continue;
396
397 if (!iff_up(ifp->int_if_flags))
398 continue;
399
400 /* The local address can only be shared with a point-to-point
401 * link.
402 */
403 if (ifp->int_addr == addr
404 && (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0))
405 return ifp;
406
407 if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask))
408 return ifp;
409 }
410 return 0;
411 }
412
413
414 /* See that a remote gateway is reachable.
415 * Note that the answer can change as real interfaces come and go.
416 */
417 int /* 0=bad */
418 check_remote(struct interface *ifp)
419 {
420 struct rt_entry *rt;
421
422 /* do not worry about other kinds */
423 if (!(ifp->int_state & IS_REMOTE))
424 return 1;
425
426 rt = rtfind(ifp->int_addr);
427 if (rt != NULL
428 && rt->rt_ifp != 0
429 &&on_net(ifp->int_addr,
430 rt->rt_ifp->int_net, rt->rt_ifp->int_mask))
431 return 1;
432
433 /* the gateway cannot be reached directly from one of our
434 * interfaces
435 */
436 if (!(ifp->int_state & IS_BROKE)) {
437 msglog("unreachable gateway %s in "_PATH_GATEWAYS,
438 naddr_ntoa(ifp->int_addr));
439 if_bad(ifp);
440 }
441 return 0;
442 }
443
444
445 /* Delete an interface.
446 */
447 static void
448 ifdel(struct interface *ifp)
449 {
450 struct ip_mreq m;
451 struct interface *ifp1;
452
453
454 trace_if("Del", ifp);
455
456 ifp->int_state |= IS_BROKE;
457
458 /* unlink the interface
459 */
460 *ifp->int_prev = ifp->int_next;
461 if (ifp->int_next != 0)
462 ifp->int_next->int_prev = ifp->int_prev;
463 *ifp->int_ahash_prev = ifp->int_ahash;
464 if (ifp->int_ahash != 0)
465 ifp->int_ahash->int_ahash_prev = ifp->int_ahash_prev;
466 *ifp->int_nhash_prev = ifp->int_nhash;
467 if (ifp->int_nhash != 0)
468 ifp->int_nhash->int_nhash_prev = ifp->int_nhash_prev;
469 if (ifp->int_if_flags & IFF_BROADCAST) {
470 *ifp->int_bhash_prev = ifp->int_bhash;
471 if (ifp->int_bhash != 0)
472 ifp->int_bhash->int_bhash_prev = ifp->int_bhash_prev;
473 }
474 if (ifp->int_state & IS_REMOTE) {
475 *ifp->int_rlink_prev = ifp->int_rlink;
476 if (ifp->int_rlink != 0)
477 ifp->int_rlink->int_rlink_prev = ifp->int_rlink_prev;
478 }
479
480 if (!(ifp->int_state & IS_ALIAS)) {
481 /* delete aliases when the main interface dies
482 */
483 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
484 if (ifp1 != ifp
485 && !strcmp(ifp->int_name, ifp1->int_name))
486 ifdel(ifp1);
487 }
488
489 if ((ifp->int_if_flags & IFF_MULTICAST)
490 #ifdef MCAST_PPP_BUG
491 && !(ifp->int_if_flags & IFF_POINTOPOINT)
492 #endif
493 && rip_sock >= 0) {
494 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
495 m.imr_interface.s_addr = ((ifp->int_if_flags
496 & IFF_POINTOPOINT)
497 ? ifp->int_dstaddr
498 : ifp->int_addr);
499 if (setsockopt(rip_sock,IPPROTO_IP,IP_DROP_MEMBERSHIP,
500 &m, sizeof(m)) < 0
501 && errno != EADDRNOTAVAIL
502 && !TRACEACTIONS)
503 LOGERR("setsockopt(IP_DROP_MEMBERSHIP RIP)");
504 if (rip_sock_mcast == ifp)
505 rip_sock_mcast = 0;
506 }
507 if (ifp->int_rip_sock >= 0) {
508 close(ifp->int_rip_sock);
509 ifp->int_rip_sock = -1;
510 fix_select();
511 }
512
513 tot_interfaces--;
514 if (!IS_RIP_OFF(ifp->int_state))
515 rip_interfaces--;
516
517 /* Zap all routes associated with this interface.
518 * Assume routes just using gateways beyond this interface
519 * will timeout naturally, and have probably already died.
520 */
521 rn_walktree(rhead, walk_bad, 0);
522
523 set_rdisc_mg(ifp, 0);
524 if_bad_rdisc(ifp);
525 }
526
527 free(ifp);
528 }
529
530
531 /* Mark an interface ill.
532 */
533 void
534 if_sick(struct interface *ifp)
535 {
536 if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) {
537 ifp->int_state |= IS_SICK;
538 ifp->int_act_time = NEVER;
539 trace_if("Chg", ifp);
540
541 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
542 }
543 }
544
545
546 /* Mark an interface dead.
547 */
548 void
549 if_bad(struct interface *ifp)
550 {
551 struct interface *ifp1;
552
553
554 if (ifp->int_state & IS_BROKE)
555 return;
556
557 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
558
559 ifp->int_state |= (IS_BROKE | IS_SICK);
560 ifp->int_act_time = NEVER;
561 ifp->int_query_time = NEVER;
562 ifp->int_data.ts = now.tv_sec;
563
564 trace_if("Chg", ifp);
565
566 if (!(ifp->int_state & IS_ALIAS)) {
567 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
568 if (ifp1 != ifp
569 && !strcmp(ifp->int_name, ifp1->int_name))
570 if_bad(ifp1);
571 }
572 rn_walktree(rhead, walk_bad, 0);
573 if_bad_rdisc(ifp);
574 }
575 }
576
577
578 /* Mark an interface alive
579 */
580 int /* 1=it was dead */
581 if_ok(struct interface *ifp,
582 const char *type)
583 {
584 struct interface *ifp1;
585
586
587 if (!(ifp->int_state & IS_BROKE)) {
588 if (ifp->int_state & IS_SICK) {
589 trace_act("%sinterface %s to %s working better",
590 type,
591 ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
592 ifp->int_state &= ~IS_SICK;
593 }
594 return 0;
595 }
596
597 msglog("%sinterface %s to %s restored",
598 type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
599 ifp->int_state &= ~(IS_BROKE | IS_SICK);
600 ifp->int_data.ts = 0;
601
602 if (!(ifp->int_state & IS_ALIAS)) {
603 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
604 if (ifp1 != ifp
605 && !strcmp(ifp->int_name, ifp1->int_name))
606 if_ok(ifp1, type);
607 }
608 if_ok_rdisc(ifp);
609 }
610
611 if (ifp->int_state & IS_REMOTE) {
612 if (!addrouteforif(ifp))
613 return 0;
614 }
615 return 1;
616 }
617
618
619 /* disassemble routing message
620 */
621 void
622 rt_xaddrs(struct rt_addrinfo *info,
623 struct sockaddr *sa,
624 struct sockaddr *lim,
625 int addrs)
626 {
627 int i;
628 #ifdef _HAVE_SA_LEN
629 static struct sockaddr sa_zero;
630 #endif
631 #define ROUNDUP(a) RT_ROUNDUP(a)
632
633
634 memset(info, 0, sizeof(*info));
635 info->rti_addrs = addrs;
636 for (i = 0; i < RTAX_MAX && sa < lim; i++) {
637 if ((addrs & (1 << i)) == 0)
638 continue;
639 #ifdef _HAVE_SA_LEN
640 info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero;
641 sa = (struct sockaddr *)((char*)(sa)
642 + ROUNDUP(sa->sa_len));
643 #else
644 info->rti_info[i] = sa;
645 sa = (struct sockaddr *)((char*)(sa)
646 + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
647 #endif
648 }
649 }
650
651
652 /* Find the network interfaces which have configured themselves.
653 * This must be done regularly, if only for extra addresses
654 * that come and go on interfaces.
655 */
656 void
657 ifinit(void)
658 {
659 static char *sysctl_buf;
660 static size_t sysctl_buf_size = 0;
661 uint complaints = 0;
662 static u_int prev_complaints = 0;
663 # define COMP_NOT_INET 0x001
664 # define COMP_NOADDR 0x002
665 # define COMP_BADADDR 0x004
666 # define COMP_NODST 0x008
667 # define COMP_NOBADR 0x010
668 # define COMP_NOMASK 0x020
669 # define COMP_DUP 0x040
670 # define COMP_BAD_METRIC 0x080
671 # define COMP_NETMASK 0x100
672
673 struct interface ifs, ifs0, *ifp, *ifp1;
674 struct rt_entry *rt;
675 size_t needed;
676 int mib[6];
677 struct if_msghdr *ifm;
678 struct ifa_msghdr *ifam, *ifam_lim, *ifam2;
679 int in, ierr, out, oerr;
680 struct intnet *intnetp;
681 struct rt_addrinfo info;
682 #ifdef SIOCGIFMETRIC
683 struct ifreq ifr;
684 #endif
685
686
687 last_ifinit = now;
688 ifinit_timer.tv_sec = now.tv_sec + (supplier
689 ? CHECK_ACT_INTERVAL
690 : CHECK_QUIET_INTERVAL);
691
692 /* mark all interfaces so we can get rid of those that disappear */
693 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next)
694 ifp->int_state &= ~(IS_CHECKED | IS_DUP);
695
696 /* Fetch the interface list, without too many system calls
697 * since we do it repeatedly.
698 */
699 mib[0] = CTL_NET;
700 mib[1] = PF_ROUTE;
701 mib[2] = 0;
702 mib[3] = AF_INET;
703 mib[4] = NET_RT_IFLIST;
704 mib[5] = 0;
705 for (;;) {
706 if ((needed = sysctl_buf_size) != 0) {
707 if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0)
708 break;
709 /* retry if the table grew */
710 if (errno != ENOMEM && errno != EFAULT)
711 BADERR(1, "ifinit: sysctl(RT_IFLIST)");
712 free(sysctl_buf);
713 needed = 0;
714 }
715 if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
716 BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate");
717 sysctl_buf = rtmalloc(sysctl_buf_size = needed,
718 "ifinit sysctl");
719 }
720
721 ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed);
722 for (ifam = (struct ifa_msghdr *)sysctl_buf;
723 ifam < ifam_lim;
724 ifam = ifam2) {
725
726 ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen);
727
728 if (ifam->ifam_type == RTM_IFINFO) {
729 struct sockaddr_dl *sdl;
730
731 ifm = (struct if_msghdr *)ifam;
732 /* make prototype structure for the IP aliases
733 */
734 memset(&ifs0, 0, sizeof(ifs0));
735 ifs0.int_rip_sock = -1;
736 ifs0.int_index = ifm->ifm_index;
737 ifs0.int_if_flags = ifm->ifm_flags;
738 ifs0.int_state = IS_CHECKED;
739 ifs0.int_query_time = NEVER;
740 ifs0.int_act_time = now.tv_sec;
741 ifs0.int_data.ts = now.tv_sec;
742 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets;
743 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors;
744 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets;
745 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors;
746 sdl = (struct sockaddr_dl *)(ifm + 1);
747 sdl->sdl_data[sdl->sdl_nlen] = 0;
748 strncpy(ifs0.int_name, sdl->sdl_data,
749 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen));
750 continue;
751 }
752 if (ifam->ifam_type != RTM_NEWADDR) {
753 logbad(1,"ifinit: out of sync");
754 continue;
755 }
756 rt_xaddrs(&info, (struct sockaddr *)(ifam+1),
757 (struct sockaddr *)ifam2,
758 ifam->ifam_addrs);
759
760 /* Prepare for the next address of this interface, which
761 * will be an alias.
762 * Do not output RIP or Router-Discovery packets via aliases.
763 */
764 memcpy(&ifs, &ifs0, sizeof(ifs));
765 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC);
766
767 if (INFO_IFA(&info) == 0) {
768 if (iff_up(ifs.int_if_flags)) {
769 if (!(prev_complaints & COMP_NOADDR))
770 msglog("%s has no address",
771 ifs.int_name);
772 complaints |= COMP_NOADDR;
773 }
774 continue;
775 }
776 if (INFO_IFA(&info)->sa_family != AF_INET) {
777 if (iff_up(ifs.int_if_flags)) {
778 if (!(prev_complaints & COMP_NOT_INET))
779 trace_act("%s: not AF_INET",
780 ifs.int_name);
781 complaints |= COMP_NOT_INET;
782 }
783 continue;
784 }
785
786 ifs.int_addr = S_ADDR(INFO_IFA(&info));
787
788 if (ntohl(ifs.int_addr)>>24 == 0
789 || ntohl(ifs.int_addr)>>24 == 0xff) {
790 if (iff_up(ifs.int_if_flags)) {
791 if (!(prev_complaints & COMP_BADADDR))
792 msglog("%s has a bad address",
793 ifs.int_name);
794 complaints |= COMP_BADADDR;
795 }
796 continue;
797 }
798
799 if (ifs.int_if_flags & IFF_LOOPBACK) {
800 ifs.int_state |= IS_PASSIVE | IS_NO_RIP | IS_NO_RDISC;
801 ifs.int_dstaddr = ifs.int_addr;
802 ifs.int_mask = HOST_MASK;
803 ifs.int_ripv1_mask = HOST_MASK;
804 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
805 ifs.int_net = ntohl(ifs.int_dstaddr);
806 if (!foundloopback) {
807 foundloopback = 1;
808 loopaddr = ifs.int_addr;
809 loop_rts.rts_gate = loopaddr;
810 loop_rts.rts_router = loopaddr;
811 }
812
813 } else if (ifs.int_if_flags & IFF_POINTOPOINT) {
814 if (INFO_BRD(&info) == 0
815 || INFO_BRD(&info)->sa_family != AF_INET) {
816 if (iff_up(ifs.int_if_flags)) {
817 if (!(prev_complaints & COMP_NODST))
818 msglog("%s has a bad"
819 " destination address",
820 ifs.int_name);
821 complaints |= COMP_NODST;
822 }
823 continue;
824 }
825 ifs.int_dstaddr = S_ADDR(INFO_BRD(&info));
826 if (ntohl(ifs.int_dstaddr)>>24 == 0
827 || ntohl(ifs.int_dstaddr)>>24 == 0xff) {
828 if (iff_up(ifs.int_if_flags)) {
829 if (!(prev_complaints & COMP_NODST))
830 msglog("%s has a bad"
831 " destination address",
832 ifs.int_name);
833 complaints |= COMP_NODST;
834 }
835 continue;
836 }
837 ifs.int_mask = HOST_MASK;
838 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info)));
839 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
840 ifs.int_net = ntohl(ifs.int_dstaddr);
841
842 } else {
843 if (INFO_MASK(&info) == 0) {
844 if (iff_up(ifs.int_if_flags)) {
845 if (!(prev_complaints & COMP_NOMASK))
846 msglog("%s has no netmask",
847 ifs.int_name);
848 complaints |= COMP_NOMASK;
849 }
850 continue;
851 }
852 ifs.int_dstaddr = ifs.int_addr;
853 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info)));
854 ifs.int_ripv1_mask = ifs.int_mask;
855 ifs.int_std_mask = std_mask(ifs.int_addr);
856 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask;
857 if (ifs.int_mask != ifs.int_std_mask)
858 ifs.int_state |= IS_SUBNET;
859
860 if (ifs.int_if_flags & IFF_BROADCAST) {
861 if (INFO_BRD(&info) == 0) {
862 if (iff_up(ifs.int_if_flags)) {
863 if (!(prev_complaints
864 & COMP_NOBADR))
865 msglog("%s has"
866 "no broadcast address",
867 ifs.int_name);
868 complaints |= COMP_NOBADR;
869 }
870 continue;
871 }
872 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info));
873 }
874 }
875 ifs.int_std_net = ifs.int_net & ifs.int_std_mask;
876 ifs.int_std_addr = htonl(ifs.int_std_net);
877
878 /* Use a minimum metric of one. Treat the interface metric
879 * (default 0) as an increment to the hop count of one.
880 *
881 * The metric obtained from the routing socket dump of
882 * interface addresses is wrong. It is not set by the
883 * SIOCSIFMETRIC ioctl.
884 */
885 #ifdef SIOCGIFMETRIC
886 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name));
887 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) {
888 DBGERR(1, "ioctl(SIOCGIFMETRIC)");
889 ifs.int_metric = 0;
890 } else {
891 ifs.int_metric = ifr.ifr_metric;
892 }
893 #else
894 ifs.int_metric = ifam->ifam_metric;
895 #endif
896 if (ifs.int_metric > HOPCNT_INFINITY) {
897 ifs.int_metric = 0;
898 if (!(prev_complaints & COMP_BAD_METRIC)
899 && iff_up(ifs.int_if_flags)) {
900 complaints |= COMP_BAD_METRIC;
901 msglog("%s has a metric of %d",
902 ifs.int_name, ifs.int_metric);
903 }
904 }
905
906 /* See if this is a familiar interface.
907 * If so, stop worrying about it if it is the same.
908 * Start it over if it now is to somewhere else, as happens
909 * frequently with PPP and SLIP.
910 */
911 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS)
912 ? ifs.int_addr
913 : 0));
914 if (ifp != NULL) {
915 ifp->int_state |= IS_CHECKED;
916
917 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags)
918 & (IFF_BROADCAST
919 | IFF_LOOPBACK
920 | IFF_POINTOPOINT
921 | IFF_MULTICAST))
922 || 0 != ((ifp->int_state ^ ifs.int_state)
923 & IS_ALIAS)
924 || ifp->int_addr != ifs.int_addr
925 || ifp->int_brdaddr != ifs.int_brdaddr
926 || ifp->int_dstaddr != ifs.int_dstaddr
927 || ifp->int_mask != ifs.int_mask
928 || ifp->int_metric != ifs.int_metric) {
929 /* Forget old information about
930 * a changed interface.
931 */
932 trace_act("interface %s has changed",
933 ifp->int_name);
934 ifdel(ifp);
935 ifp = NULL;
936 }
937 }
938
939 if (ifp != NULL) {
940 /* The primary representative of an alias worries
941 * about how things are working.
942 */
943 if (ifp->int_state & IS_ALIAS)
944 continue;
945
946 /* note interfaces that have been turned off
947 */
948 if (!iff_up(ifs.int_if_flags)) {
949 if (iff_up(ifp->int_if_flags)) {
950 msglog("interface %s to %s turned off",
951 ifp->int_name,
952 naddr_ntoa(ifp->int_dstaddr));
953 if_bad(ifp);
954 ifp->int_if_flags &= ~IFF_UP;
955 } else if (now.tv_sec>(ifp->int_data.ts
956 + CHECK_BAD_INTERVAL)) {
957 trace_act("interface %s has been off"
958 " %ld seconds; forget it",
959 ifp->int_name,
960 now.tv_sec-ifp->int_data.ts);
961 ifdel(ifp);
962 }
963 continue;
964 }
965 /* or that were off and are now ok */
966 if (!iff_up(ifp->int_if_flags)) {
967 ifp->int_if_flags |= IFF_UP;
968 if_ok(ifp, "");
969 }
970
971 /* If it has been long enough,
972 * see if the interface is broken.
973 */
974 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL)
975 continue;
976
977 in = ifs.int_data.ipackets - ifp->int_data.ipackets;
978 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors;
979 out = ifs.int_data.opackets - ifp->int_data.opackets;
980 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors;
981 /* If the interface just awoke, restart the counters.
982 */
983 if (ifp->int_data.ts == 0) {
984 ifp->int_data = ifs.int_data;
985 continue;
986 }
987 ifp->int_data = ifs.int_data;
988
989 /* Withhold judgment when the short error
990 * counters wrap or the interface is reset.
991 */
992 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) {
993 LIM_SEC(ifinit_timer,
994 now.tv_sec+CHECK_BAD_INTERVAL);
995 continue;
996 }
997
998 /* Withhold judgement when there is no traffic
999 */
1000 if (in == 0 && out == 0 && ierr == 0 && oerr == 0)
1001 continue;
1002
1003 /* It is bad if input or output is not working.
1004 * Require presistent problems before marking it dead.
1005 */
1006 if ((in <= ierr && ierr > 0)
1007 || (out <= oerr && oerr > 0)) {
1008 if (!(ifp->int_state & IS_SICK)) {
1009 trace_act("interface %s to %s"
1010 " sick: in=%d ierr=%d"
1011 " out=%d oerr=%d",
1012 ifp->int_name,
1013 naddr_ntoa(ifp->int_dstaddr),
1014 in, ierr, out, oerr);
1015 if_sick(ifp);
1016 continue;
1017 }
1018 if (!(ifp->int_state & IS_BROKE)) {
1019 msglog("interface %s to %s broken:"
1020 " in=%d ierr=%d out=%d oerr=%d",
1021 ifp->int_name,
1022 naddr_ntoa(ifp->int_dstaddr),
1023 in, ierr, out, oerr);
1024 if_bad(ifp);
1025 }
1026 continue;
1027 }
1028
1029 /* otherwise, it is active and healthy
1030 */
1031 ifp->int_act_time = now.tv_sec;
1032 if_ok(ifp, "");
1033 continue;
1034 }
1035
1036 /* This is a new interface.
1037 * If it is dead, forget it.
1038 */
1039 if (!iff_up(ifs.int_if_flags))
1040 continue;
1041
1042 /* If it duplicates an existing interface,
1043 * complain about it, mark the other one
1044 * duplicated, and forget this one.
1045 */
1046 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask,
1047 ifs.int_if_flags);
1048 if (ifp != NULL) {
1049 /* Ignore duplicates of itself, caused by having
1050 * IP aliases on the same network.
1051 */
1052 if (!strcmp(ifp->int_name, ifs.int_name))
1053 continue;
1054
1055 if (!(prev_complaints & COMP_DUP)) {
1056 complaints |= COMP_DUP;
1057 msglog("%s (%s%s%s) is duplicated by"
1058 " %s (%s%s%s)",
1059 ifs.int_name,
1060 addrname(ifs.int_addr,ifs.int_mask,1),
1061 ((ifs.int_if_flags & IFF_POINTOPOINT)
1062 ? "-->" : ""),
1063 ((ifs.int_if_flags & IFF_POINTOPOINT)
1064 ? naddr_ntoa(ifs.int_dstaddr) : ""),
1065 ifp->int_name,
1066 addrname(ifp->int_addr,ifp->int_mask,1),
1067 ((ifp->int_if_flags & IFF_POINTOPOINT)
1068 ? "-->" : ""),
1069 ((ifp->int_if_flags & IFF_POINTOPOINT)
1070 ? naddr_ntoa(ifp->int_dstaddr) : ""));
1071 }
1072 ifp->int_state |= IS_DUP;
1073 continue;
1074 }
1075
1076 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST))
1077 && !(ifs.int_state & IS_PASSIVE)) {
1078 trace_act("%s is neither broadcast, point-to-point,"
1079 " nor loopback",
1080 ifs.int_name);
1081 if (!(ifs.int_state & IFF_MULTICAST))
1082 ifs.int_state |= IS_NO_RDISC;
1083 }
1084
1085
1086 /* It is new and ok. Add it to the list of interfaces
1087 */
1088 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp");
1089 memcpy(ifp, &ifs, sizeof(*ifp));
1090 get_parms(ifp);
1091 if_link(ifp);
1092 trace_if("Add", ifp);
1093
1094 /* Notice likely bad netmask.
1095 */
1096 if (!(prev_complaints & COMP_NETMASK)
1097 && !(ifp->int_if_flags & IFF_POINTOPOINT)
1098 && ifp->int_addr != RIP_DEFAULT) {
1099 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
1100 if (ifp1->int_mask == ifp->int_mask)
1101 continue;
1102 if (ifp1->int_if_flags & IFF_POINTOPOINT)
1103 continue;
1104 if (ifp1->int_dstaddr == RIP_DEFAULT)
1105 continue;
1106 /* ignore aliases on the right network */
1107 if (!strcmp(ifp->int_name, ifp1->int_name))
1108 continue;
1109 if (on_net(ifp->int_dstaddr,
1110 ifp1->int_net, ifp1->int_mask)
1111 || on_net(ifp1->int_dstaddr,
1112 ifp->int_net, ifp->int_mask)) {
1113 msglog("possible netmask problem"
1114 " between %s:%s and %s:%s",
1115 ifp->int_name,
1116 addrname(htonl(ifp->int_net),
1117 ifp->int_mask, 1),
1118 ifp1->int_name,
1119 addrname(htonl(ifp1->int_net),
1120 ifp1->int_mask, 1));
1121 complaints |= COMP_NETMASK;
1122 }
1123 }
1124 }
1125
1126 if (!(ifp->int_state & IS_ALIAS)) {
1127 /* Count the # of directly connected networks.
1128 */
1129 if (!(ifp->int_if_flags & IFF_LOOPBACK))
1130 tot_interfaces++;
1131 if (!IS_RIP_OFF(ifp->int_state))
1132 rip_interfaces++;
1133
1134 /* turn on router discovery and RIP If needed */
1135 if_ok_rdisc(ifp);
1136 rip_on(ifp);
1137 }
1138 }
1139
1140 /* If we are multi-homed and have at least two interfaces
1141 * listening to RIP, then output by default.
1142 */
1143 if (!supplier_set && rip_interfaces > 1)
1144 set_supplier();
1145
1146 /* If we are multi-homed, optionally advertise a route to
1147 * our main address.
1148 */
1149 if (advertise_mhome
1150 || (tot_interfaces > 1
1151 && mhome
1152 && (ifp = ifwithaddr(myaddr, 0, 0)) != NULL
1153 && foundloopback)) {
1154 advertise_mhome = 1;
1155 rt = rtget(myaddr, HOST_MASK);
1156 if (rt != NULL) {
1157 if (rt->rt_ifp != ifp
1158 || rt->rt_router != loopaddr) {
1159 rtdelete(rt);
1160 rt = NULL;
1161 } else {
1162 loop_rts.rts_ifp = ifp;
1163 loop_rts.rts_metric = 0;
1164 loop_rts.rts_time = rt->rt_time;
1165 rtchange(rt, rt->rt_state | RS_MHOME,
1166 &loop_rts, 0);
1167 }
1168 }
1169 if (rt == NULL) {
1170 loop_rts.rts_ifp = ifp;
1171 loop_rts.rts_metric = 0;
1172 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts);
1173 }
1174 }
1175
1176 for (ifp = ifnet; ifp != NULL; ifp = ifp1) {
1177 ifp1 = ifp->int_next; /* because we may delete it */
1178
1179 /* Forget any interfaces that have disappeared.
1180 */
1181 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) {
1182 trace_act("interface %s has disappeared",
1183 ifp->int_name);
1184 ifdel(ifp);
1185 continue;
1186 }
1187
1188 if ((ifp->int_state & IS_BROKE)
1189 && !(ifp->int_state & IS_PASSIVE))
1190 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
1191
1192 /* If we ever have a RIPv1 interface, assume we always will.
1193 * It might come back if it ever goes away.
1194 */
1195 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier)
1196 have_ripv1_out = 1;
1197 if (!(ifp->int_state & IS_NO_RIPV1_IN))
1198 have_ripv1_in = 1;
1199 }
1200
1201 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) {
1202 /* Ensure there is always a network route for interfaces,
1203 * after any dead interfaces have been deleted, which
1204 * might affect routes for point-to-point links.
1205 */
1206 if (!addrouteforif(ifp))
1207 continue;
1208
1209 /* Add routes to the local end of point-to-point interfaces
1210 * using loopback.
1211 */
1212 if ((ifp->int_if_flags & IFF_POINTOPOINT)
1213 && !(ifp->int_state & IS_REMOTE)
1214 && foundloopback) {
1215 /* Delete any routes to the network address through
1216 * foreign routers. Remove even static routes.
1217 */
1218 del_static(ifp->int_addr, HOST_MASK, 0, 0);
1219 rt = rtget(ifp->int_addr, HOST_MASK);
1220 if (rt != NULL && rt->rt_router != loopaddr) {
1221 rtdelete(rt);
1222 rt = NULL;
1223 }
1224 if (rt != NULL) {
1225 if (!(rt->rt_state & RS_LOCAL)
1226 || rt->rt_metric > ifp->int_metric) {
1227 ifp1 = ifp;
1228 } else {
1229 ifp1 = rt->rt_ifp;
1230 }
1231 loop_rts.rts_ifp = ifp1;
1232 loop_rts.rts_metric = 0;
1233 loop_rts.rts_time = rt->rt_time;
1234 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN)
1235 | (RS_IF|RS_LOCAL)),
1236 &loop_rts, 0);
1237 } else {
1238 loop_rts.rts_ifp = ifp;
1239 loop_rts.rts_metric = 0;
1240 rtadd(ifp->int_addr, HOST_MASK,
1241 (RS_IF | RS_LOCAL), &loop_rts);
1242 }
1243 }
1244 }
1245
1246 /* add the authority routes */
1247 for (intnetp = intnets; intnetp!=NULL; intnetp = intnetp->intnet_next) {
1248 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask);
1249 if (rt != NULL
1250 && !(rt->rt_state & RS_NO_NET_SYN)
1251 && !(rt->rt_state & RS_NET_INT)) {
1252 rtdelete(rt);
1253 rt = NULL;
1254 }
1255 if (rt == NULL) {
1256 loop_rts.rts_ifp = 0;
1257 loop_rts.rts_metric = intnetp->intnet_metric-1;
1258 rtadd(intnetp->intnet_addr, intnetp->intnet_mask,
1259 RS_NET_SYN | RS_NET_INT, &loop_rts);
1260 }
1261 }
1262
1263 prev_complaints = complaints;
1264 }
1265
1266
1267 static void
1268 check_net_syn(struct interface *ifp)
1269 {
1270 struct rt_entry *rt;
1271 static struct rt_spare new;
1272
1273
1274 /* Turn on the need to automatically synthesize a network route
1275 * for this interface only if we are running RIPv1 on some other
1276 * interface that is on a different class-A,B,or C network.
1277 */
1278 if (have_ripv1_out || have_ripv1_in) {
1279 ifp->int_state |= IS_NEED_NET_SYN;
1280 rt = rtget(ifp->int_std_addr, ifp->int_std_mask);
1281 if (rt != NULL
1282 && 0 == (rt->rt_state & RS_NO_NET_SYN)
1283 && (!(rt->rt_state & RS_NET_SYN)
1284 || rt->rt_metric > ifp->int_metric)) {
1285 rtdelete(rt);
1286 rt = NULL;
1287 }
1288 if (rt == NULL) {
1289 new.rts_ifp = ifp;
1290 new.rts_gate = ifp->int_addr;
1291 new.rts_router = ifp->int_addr;
1292 new.rts_metric = ifp->int_metric;
1293 rtadd(ifp->int_std_addr, ifp->int_std_mask,
1294 RS_NET_SYN, &new);
1295 }
1296
1297 } else {
1298 ifp->int_state &= ~IS_NEED_NET_SYN;
1299
1300 rt = rtget(ifp->int_std_addr,
1301 ifp->int_std_mask);
1302 if (rt != NULL
1303 && (rt->rt_state & RS_NET_SYN)
1304 && rt->rt_ifp == ifp)
1305 rtbad_sub(rt);
1306 }
1307 }
1308
1309
1310 /* Add route for interface if not currently installed.
1311 * Create route to other end if a point-to-point link,
1312 * otherwise a route to this (sub)network.
1313 */
1314 int /* 0=bad interface */
1315 addrouteforif(struct interface *ifp)
1316 {
1317 struct rt_entry *rt;
1318 static struct rt_spare new;
1319 naddr dst;
1320
1321
1322 /* skip sick interfaces
1323 */
1324 if (ifp->int_state & IS_BROKE)
1325 return 0;
1326
1327 /* If the interface on a subnet, then install a RIPv1 route to
1328 * the network as well (unless it is sick).
1329 */
1330 if (ifp->int_state & IS_SUBNET)
1331 check_net_syn(ifp);
1332
1333 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK))
1334 ? ifp->int_dstaddr
1335 : htonl(ifp->int_net));
1336
1337 new.rts_ifp = ifp;
1338 new.rts_router = ifp->int_addr;
1339 new.rts_gate = ifp->int_addr;
1340 new.rts_metric = ifp->int_metric;
1341 new.rts_time = now.tv_sec;
1342
1343 /* If we are going to send packets to the gateway,
1344 * it must be reachable using our physical interfaces
1345 */
1346 if ((ifp->int_state & IS_REMOTE)
1347 && !(ifp->int_state & IS_EXTERNAL)
1348 && !check_remote(ifp))
1349 return 0;
1350
1351 /* We are finished if the correct main interface route exists.
1352 * The right route must be for the right interface, not synthesized
1353 * from a subnet, be a "gateway" or not as appropriate, and so forth.
1354 */
1355 del_static(dst, ifp->int_mask, 0, 0);
1356 rt = rtget(dst, ifp->int_mask);
1357 if (rt != NULL) {
1358 if ((rt->rt_ifp != ifp
1359 || rt->rt_router != ifp->int_addr)
1360 && (!(ifp->int_state & IS_DUP)
1361 || rt->rt_ifp == 0
1362 || (rt->rt_ifp->int_state & IS_BROKE))) {
1363 rtdelete(rt);
1364 rt = NULL;
1365 } else {
1366 rtchange(rt, ((rt->rt_state | RS_IF)
1367 & ~(RS_NET_SYN | RS_LOCAL)),
1368 &new, 0);
1369 }
1370 }
1371 if (rt == NULL) {
1372 if (ifp->int_transitions++ > 0)
1373 trace_act("re-install interface %s",
1374 ifp->int_name);
1375
1376 rtadd(dst, ifp->int_mask, RS_IF, &new);
1377 }
1378
1379 return 1;
1380 }
DragonFly BSD