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kernel - close holes in autoconf's run_interrupt_driven_config_hooks()
[dragonfly.git] / sbin / routed / if.c
blob8fbc2f3971662bf87d16d2226d48faeabd651f9b
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgment:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/sbin/routed/if.c,v 1.6.2.1 2000/08/14 17:00:03 sheldonh Exp $
34 * $DragonFly: src/sbin/routed/if.c,v 1.5 2005/03/16 21:21:34 cpressey Exp $
35 */
36
37 #include "defs.h"
38 #include "pathnames.h"
39
40 #if !defined(sgi) && !defined(__NetBSD__)
41 static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93";
42 #elif defined(__NetBSD__)
43 #include <sys/cdefs.h>
44 __RCSID("$NetBSD$");
45 #endif
46
47 struct interface *ifnet; /* all interfaces */
48
49 /* hash table for all interfaces, big enough to tolerate ridiculous
50 * numbers of IP aliases. Crazy numbers of aliases such as 7000
51 * still will not do well, but not just in looking up interfaces
52 * by name or address.
53 */
54 #define AHASH_LEN 211 /* must be prime */
55 #define AHASH(a) &ahash_tbl[(a)%AHASH_LEN]
56 struct interface *ahash_tbl[AHASH_LEN];
57
58 #define BHASH_LEN 211 /* must be prime */
59 #define BHASH(a) &bhash_tbl[(a)%BHASH_LEN]
60 struct interface *bhash_tbl[BHASH_LEN];
61
62 struct interface *remote_if; /* remote interfaces */
63
64 /* hash for physical interface names.
65 * Assume there are never more 100 or 200 real interfaces, and that
66 * aliases are put on the end of the hash chains.
67 */
68 #define NHASH_LEN 97
69 struct interface *nhash_tbl[NHASH_LEN];
70
71 int tot_interfaces; /* # of remote and local interfaces */
72 int rip_interfaces; /* # of interfaces doing RIP */
73 int foundloopback; /* valid flag for loopaddr */
74 naddr loopaddr; /* our address on loopback */
75 struct rt_spare loop_rts;
76
77 struct timeval ifinit_timer;
78 static struct timeval last_ifinit;
79 #define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \
80 && last_ifinit.tv_usec == now.tv_usec \
81 && timercmp(&ifinit_timer, &now, >))
82
83 int have_ripv1_out; /* have a RIPv1 interface */
84 int have_ripv1_in;
85
86
87 static struct interface**
88 nhash(char *p)
89 {
90 u_int i;
91
92 for (i = 0; *p != '\0'; p++) {
93 i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1);
94 i ^= *p;
95 }
96 return &nhash_tbl[i % NHASH_LEN];
97 }
98
99
100 /* Link a new interface into the lists and hash tables.
101 */
102 void
103 if_link(struct interface *ifp)
104 {
105 struct interface **hifp;
106
107 ifp->int_prev = &ifnet;
108 ifp->int_next = ifnet;
109 if (ifnet != 0)
110 ifnet->int_prev = &ifp->int_next;
111 ifnet = ifp;
112
113 hifp = AHASH(ifp->int_addr);
114 ifp->int_ahash_prev = hifp;
115 if ((ifp->int_ahash = *hifp) != 0)
116 (*hifp)->int_ahash_prev = &ifp->int_ahash;
117 *hifp = ifp;
118
119 if (ifp->int_if_flags & IFF_BROADCAST) {
120 hifp = BHASH(ifp->int_brdaddr);
121 ifp->int_bhash_prev = hifp;
122 if ((ifp->int_bhash = *hifp) != 0)
123 (*hifp)->int_bhash_prev = &ifp->int_bhash;
124 *hifp = ifp;
125 }
126
127 if (ifp->int_state & IS_REMOTE) {
128 ifp->int_rlink_prev = &remote_if;
129 ifp->int_rlink = remote_if;
130 if (remote_if != 0)
131 remote_if->int_rlink_prev = &ifp->int_rlink;
132 remote_if = ifp;
133 }
134
135 hifp = nhash(ifp->int_name);
136 if (ifp->int_state & IS_ALIAS) {
137 /* put aliases on the end of the hash chain */
138 while (*hifp != 0)
139 hifp = &(*hifp)->int_nhash;
140 }
141 ifp->int_nhash_prev = hifp;
142 if ((ifp->int_nhash = *hifp) != 0)
143 (*hifp)->int_nhash_prev = &ifp->int_nhash;
144 *hifp = ifp;
145 }
146
147
148 /* Find the interface with an address
149 */
150 struct interface *
151 ifwithaddr(naddr addr,
152 int bcast, /* notice IFF_BROADCAST address */
153 int remote) /* include IS_REMOTE interfaces */
154 {
155 struct interface *ifp, *possible = 0;
156
157 remote = (remote == 0) ? IS_REMOTE : 0;
158
159 for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) {
160 if (ifp->int_addr != addr)
161 continue;
162 if ((ifp->int_state & remote) != 0)
163 continue;
164 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
165 return ifp;
166 possible = ifp;
167 }
168
169 if (possible || !bcast)
170 return possible;
171
172 for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) {
173 if (ifp->int_brdaddr != addr)
174 continue;
175 if ((ifp->int_state & remote) != 0)
176 continue;
177 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
178 return ifp;
179 possible = ifp;
180 }
181
182 return possible;
183 }
184
185
186 /* find the interface with a name
187 */
188 struct interface *
189 ifwithname(char *name, /* "ec0" or whatever */
190 naddr addr) /* 0 or network address */
191 {
192 struct interface *ifp;
193
194 for (;;) {
195 for (ifp = *nhash(name); ifp != 0; ifp = ifp->int_nhash) {
196 /* If the network address is not specified,
197 * ignore any alias interfaces. Otherwise, look
198 * for the interface with the target name and address.
199 */
200 if (!strcmp(ifp->int_name, name)
201 && ((addr == 0 && !(ifp->int_state & IS_ALIAS))
202 || (ifp->int_addr == addr)))
203 return ifp;
204 }
205
206 /* If there is no known interface, maybe there is a
207 * new interface. So just once look for new interfaces.
208 */
209 if (IF_RESCAN_DELAY())
210 return 0;
211 ifinit();
212 }
213 }
214
215
216 struct interface *
217 ifwithindex(u_short idx, int rescan_ok)
218 {
219 struct interface *ifp;
220
221 for (;;) {
222 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
223 if (ifp->int_index == idx)
224 return ifp;
225 }
226
227 /* If there is no known interface, maybe there is a
228 * new interface. So just once look for new interfaces.
229 */
230 if (!rescan_ok
231 || IF_RESCAN_DELAY())
232 return 0;
233 ifinit();
234 }
235 }
236
237
238 /* Find an interface from which the specified address
239 * should have come from. Used for figuring out which
240 * interface a packet came in on.
241 */
242 struct interface *
243 iflookup(naddr addr)
244 {
245 struct interface *ifp, *maybe;
246
247 maybe = 0;
248 for (;;) {
249 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
250 if (ifp->int_if_flags & IFF_POINTOPOINT) {
251 /* finished with a match */
252 if (ifp->int_dstaddr == addr)
253 return ifp;
254
255 } else {
256 /* finished with an exact match */
257 if (ifp->int_addr == addr)
258 return ifp;
259
260 /* Look for the longest approximate match.
261 */
262 if (on_net(addr, ifp->int_net, ifp->int_mask)
263 && (maybe == 0
264 || ifp->int_mask > maybe->int_mask))
265 maybe = ifp;
266 }
267 }
268
269 if (maybe != 0
270 || IF_RESCAN_DELAY())
271 return maybe;
272
273 /* If there is no known interface, maybe there is a
274 * new interface. So just once look for new interfaces.
275 */
276 ifinit();
277 }
278 }
279
280
281 /* Return the classical netmask for an IP address.
282 */
283 naddr /* host byte order */
284 std_mask(naddr addr) /* network byte order */
285 {
286 addr = ntohl(addr); /* was a host, not a network */
287
288 if (addr == 0) /* default route has mask 0 */
289 return 0;
290 if (IN_CLASSA(addr))
291 return IN_CLASSA_NET;
292 if (IN_CLASSB(addr))
293 return IN_CLASSB_NET;
294 return IN_CLASSC_NET;
295 }
296
297
298 /* Find the netmask that would be inferred by RIPv1 listeners
299 * on the given interface for a given network.
300 * If no interface is specified, look for the best fitting interface.
301 */
302 naddr
303 ripv1_mask_net(naddr addr, /* in network byte order */
304 struct interface *ifp) /* as seen on this interface */
305 {
306 struct r1net *r1p;
307 naddr mask = 0;
308
309 if (addr == 0) /* default always has 0 mask */
310 return mask;
311
312 if (ifp != 0 && ifp->int_ripv1_mask != HOST_MASK) {
313 /* If the target network is that of the associated interface
314 * on which it arrived, then use the netmask of the interface.
315 */
316 if (on_net(addr, ifp->int_net, ifp->int_std_mask))
317 mask = ifp->int_ripv1_mask;
318
319 } else {
320 /* Examine all interfaces, and if it the target seems
321 * to have the same network number of an interface, use the
322 * netmask of that interface. If there is more than one
323 * such interface, prefer the interface with the longest
324 * match.
325 */
326 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
327 if (on_net(addr, ifp->int_std_net, ifp->int_std_mask)
328 && ifp->int_ripv1_mask > mask
329 && ifp->int_ripv1_mask != HOST_MASK)
330 mask = ifp->int_ripv1_mask;
331 }
332
333 }
334
335 /* check special definitions */
336 if (mask == 0) {
337 for (r1p = r1nets; r1p != 0; r1p = r1p->r1net_next) {
338 if (on_net(addr, r1p->r1net_net, r1p->r1net_match)
339 && r1p->r1net_mask > mask)
340 mask = r1p->r1net_mask;
341 }
342
343 /* Otherwise, make the classic A/B/C guess.
344 */
345 if (mask == 0)
346 mask = std_mask(addr);
347 }
348
349 return mask;
350 }
351
352
353 naddr
354 ripv1_mask_host(naddr addr, /* in network byte order */
355 struct interface *ifp) /* as seen on this interface */
356 {
357 naddr mask = ripv1_mask_net(addr, ifp);
358
359
360 /* If the computed netmask does not mask the address,
361 * then assume it is a host address
362 */
363 if ((ntohl(addr) & ~mask) != 0)
364 mask = HOST_MASK;
365 return mask;
366 }
367
368
369 /* See if a IP address looks reasonable as a destination
370 */
371 int /* 0=bad */
372 check_dst(naddr addr)
373 {
374 addr = ntohl(addr);
375
376 if (IN_CLASSA(addr)) {
377 if (addr == 0)
378 return 1; /* default */
379
380 addr >>= IN_CLASSA_NSHIFT;
381 return (addr != 0 && addr != IN_LOOPBACKNET);
382 }
383
384 return (IN_CLASSB(addr) || IN_CLASSC(addr));
385 }
386
387
388 /* See a new interface duplicates an existing interface.
389 */
390 struct interface *
391 check_dup(naddr addr, /* IP address, so network byte order */
392 naddr dstaddr, /* ditto */
393 naddr mask, /* mask, so host byte order */
394 int if_flags)
395 {
396 struct interface *ifp;
397
398 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
399 if (ifp->int_mask != mask)
400 continue;
401
402 if (!iff_up(ifp->int_if_flags))
403 continue;
404
405 /* The local address can only be shared with a point-to-point
406 * link.
407 */
408 if (ifp->int_addr == addr
409 && (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0))
410 return ifp;
411
412 if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask))
413 return ifp;
414 }
415 return 0;
416 }
417
418
419 /* See that a remote gateway is reachable.
420 * Note that the answer can change as real interfaces come and go.
421 */
422 int /* 0=bad */
423 check_remote(struct interface *ifp)
424 {
425 struct rt_entry *rt;
426
427 /* do not worry about other kinds */
428 if (!(ifp->int_state & IS_REMOTE))
429 return 1;
430
431 rt = rtfind(ifp->int_addr);
432 if (rt != 0
433 && rt->rt_ifp != 0
434 &&on_net(ifp->int_addr,
435 rt->rt_ifp->int_net, rt->rt_ifp->int_mask))
436 return 1;
437
438 /* the gateway cannot be reached directly from one of our
439 * interfaces
440 */
441 if (!(ifp->int_state & IS_BROKE)) {
442 msglog("unreachable gateway %s in "_PATH_GATEWAYS,
443 naddr_ntoa(ifp->int_addr));
444 if_bad(ifp);
445 }
446 return 0;
447 }
448
449
450 /* Delete an interface.
451 */
452 static void
453 ifdel(struct interface *ifp)
454 {
455 struct ip_mreq m;
456 struct interface *ifp1;
457
458
459 trace_if("Del", ifp);
460
461 ifp->int_state |= IS_BROKE;
462
463 /* unlink the interface
464 */
465 *ifp->int_prev = ifp->int_next;
466 if (ifp->int_next != 0)
467 ifp->int_next->int_prev = ifp->int_prev;
468 *ifp->int_ahash_prev = ifp->int_ahash;
469 if (ifp->int_ahash != 0)
470 ifp->int_ahash->int_ahash_prev = ifp->int_ahash_prev;
471 *ifp->int_nhash_prev = ifp->int_nhash;
472 if (ifp->int_nhash != 0)
473 ifp->int_nhash->int_nhash_prev = ifp->int_nhash_prev;
474 if (ifp->int_if_flags & IFF_BROADCAST) {
475 *ifp->int_bhash_prev = ifp->int_bhash;
476 if (ifp->int_bhash != 0)
477 ifp->int_bhash->int_bhash_prev = ifp->int_bhash_prev;
478 }
479 if (ifp->int_state & IS_REMOTE) {
480 *ifp->int_rlink_prev = ifp->int_rlink;
481 if (ifp->int_rlink != 0)
482 ifp->int_rlink->int_rlink_prev = ifp->int_rlink_prev;
483 }
484
485 if (!(ifp->int_state & IS_ALIAS)) {
486 /* delete aliases when the main interface dies
487 */
488 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) {
489 if (ifp1 != ifp
490 && !strcmp(ifp->int_name, ifp1->int_name))
491 ifdel(ifp1);
492 }
493
494 if ((ifp->int_if_flags & IFF_MULTICAST)
495 #ifdef MCAST_PPP_BUG
496 && !(ifp->int_if_flags & IFF_POINTOPOINT)
497 #endif
498 && rip_sock >= 0) {
499 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
500 m.imr_interface.s_addr = ((ifp->int_if_flags
501 & IFF_POINTOPOINT)
502 ? ifp->int_dstaddr
503 : ifp->int_addr);
504 if (setsockopt(rip_sock,IPPROTO_IP,IP_DROP_MEMBERSHIP,
505 &m, sizeof(m)) < 0
506 && errno != EADDRNOTAVAIL
507 && !TRACEACTIONS)
508 LOGERR("setsockopt(IP_DROP_MEMBERSHIP RIP)");
509 if (rip_sock_mcast == ifp)
510 rip_sock_mcast = 0;
511 }
512 if (ifp->int_rip_sock >= 0) {
513 close(ifp->int_rip_sock);
514 ifp->int_rip_sock = -1;
515 fix_select();
516 }
517
518 tot_interfaces--;
519 if (!IS_RIP_OFF(ifp->int_state))
520 rip_interfaces--;
521
522 /* Zap all routes associated with this interface.
523 * Assume routes just using gateways beyond this interface
524 * will timeout naturally, and have probably already died.
525 */
526 rn_walktree(rhead, walk_bad, 0);
527
528 set_rdisc_mg(ifp, 0);
529 if_bad_rdisc(ifp);
530 }
531
532 free(ifp);
533 }
534
535
536 /* Mark an interface ill.
537 */
538 void
539 if_sick(struct interface *ifp)
540 {
541 if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) {
542 ifp->int_state |= IS_SICK;
543 ifp->int_act_time = NEVER;
544 trace_if("Chg", ifp);
545
546 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
547 }
548 }
549
550
551 /* Mark an interface dead.
552 */
553 void
554 if_bad(struct interface *ifp)
555 {
556 struct interface *ifp1;
557
558
559 if (ifp->int_state & IS_BROKE)
560 return;
561
562 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
563
564 ifp->int_state |= (IS_BROKE | IS_SICK);
565 ifp->int_act_time = NEVER;
566 ifp->int_query_time = NEVER;
567 ifp->int_data.ts = now.tv_sec;
568
569 trace_if("Chg", ifp);
570
571 if (!(ifp->int_state & IS_ALIAS)) {
572 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) {
573 if (ifp1 != ifp
574 && !strcmp(ifp->int_name, ifp1->int_name))
575 if_bad(ifp1);
576 }
577 rn_walktree(rhead, walk_bad, 0);
578 if_bad_rdisc(ifp);
579 }
580 }
581
582
583 /* Mark an interface alive
584 */
585 int /* 1=it was dead */
586 if_ok(struct interface *ifp,
587 const char *type)
588 {
589 struct interface *ifp1;
590
591
592 if (!(ifp->int_state & IS_BROKE)) {
593 if (ifp->int_state & IS_SICK) {
594 trace_act("%sinterface %s to %s working better",
595 type,
596 ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
597 ifp->int_state &= ~IS_SICK;
598 }
599 return 0;
600 }
601
602 msglog("%sinterface %s to %s restored",
603 type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
604 ifp->int_state &= ~(IS_BROKE | IS_SICK);
605 ifp->int_data.ts = 0;
606
607 if (!(ifp->int_state & IS_ALIAS)) {
608 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) {
609 if (ifp1 != ifp
610 && !strcmp(ifp->int_name, ifp1->int_name))
611 if_ok(ifp1, type);
612 }
613 if_ok_rdisc(ifp);
614 }
615
616 if (ifp->int_state & IS_REMOTE) {
617 if (!addrouteforif(ifp))
618 return 0;
619 }
620 return 1;
621 }
622
623
624 /* disassemble routing message
625 */
626 void
627 rt_xaddrs(struct rt_addrinfo *info,
628 struct sockaddr *sa,
629 struct sockaddr *lim,
630 int addrs)
631 {
632 int i;
633 #ifdef _HAVE_SA_LEN
634 static struct sockaddr sa_zero;
635 #endif
636 #ifdef sgi
637 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
638 : sizeof(__uint64_t))
639 #else
640 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
641 : sizeof(long))
642 #endif
643
644
645 memset(info, 0, sizeof(*info));
646 info->rti_addrs = addrs;
647 for (i = 0; i < RTAX_MAX && sa < lim; i++) {
648 if ((addrs & (1 << i)) == 0)
649 continue;
650 #ifdef _HAVE_SA_LEN
651 info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero;
652 sa = (struct sockaddr *)((char*)(sa)
653 + ROUNDUP(sa->sa_len));
654 #else
655 info->rti_info[i] = sa;
656 sa = (struct sockaddr *)((char*)(sa)
657 + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
658 #endif
659 }
660 }
661
662
663 /* Find the network interfaces which have configured themselves.
664 * This must be done regularly, if only for extra addresses
665 * that come and go on interfaces.
666 */
667 void
668 ifinit(void)
669 {
670 static char *sysctl_buf;
671 static size_t sysctl_buf_size = 0;
672 uint complaints = 0;
673 static u_int prev_complaints = 0;
674 # define COMP_NOT_INET 0x001
675 # define COMP_NOADDR 0x002
676 # define COMP_BADADDR 0x004
677 # define COMP_NODST 0x008
678 # define COMP_NOBADR 0x010
679 # define COMP_NOMASK 0x020
680 # define COMP_DUP 0x040
681 # define COMP_BAD_METRIC 0x080
682 # define COMP_NETMASK 0x100
683
684 struct interface ifs, ifs0, *ifp, *ifp1;
685 struct rt_entry *rt;
686 size_t needed;
687 int mib[6];
688 struct if_msghdr *ifm;
689 struct ifa_msghdr *ifam, *ifam_lim, *ifam2;
690 int in, ierr, out, oerr;
691 struct intnet *intnetp;
692 struct rt_addrinfo info;
693 #ifdef SIOCGIFMETRIC
694 struct ifreq ifr;
695 #endif
696
697
698 last_ifinit = now;
699 ifinit_timer.tv_sec = now.tv_sec + (supplier
700 ? CHECK_ACT_INTERVAL
701 : CHECK_QUIET_INTERVAL);
702
703 /* mark all interfaces so we can get rid of those that disappear */
704 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next)
705 ifp->int_state &= ~(IS_CHECKED | IS_DUP);
706
707 /* Fetch the interface list, without too many system calls
708 * since we do it repeatedly.
709 */
710 mib[0] = CTL_NET;
711 mib[1] = PF_ROUTE;
712 mib[2] = 0;
713 mib[3] = AF_INET;
714 mib[4] = NET_RT_IFLIST;
715 mib[5] = 0;
716 for (;;) {
717 if ((needed = sysctl_buf_size) != 0) {
718 if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0)
719 break;
720 /* retry if the table grew */
721 if (errno != ENOMEM && errno != EFAULT)
722 BADERR(1, "ifinit: sysctl(RT_IFLIST)");
723 free(sysctl_buf);
724 needed = 0;
725 }
726 if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
727 BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate");
728 sysctl_buf = rtmalloc(sysctl_buf_size = needed,
729 "ifinit sysctl");
730 }
731
732 ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed);
733 for (ifam = (struct ifa_msghdr *)sysctl_buf;
734 ifam < ifam_lim;
735 ifam = ifam2) {
736
737 ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen);
738
739 if (ifam->ifam_type == RTM_IFINFO) {
740 struct sockaddr_dl *sdl;
741
742 ifm = (struct if_msghdr *)ifam;
743 /* make prototype structure for the IP aliases
744 */
745 memset(&ifs0, 0, sizeof(ifs0));
746 ifs0.int_rip_sock = -1;
747 ifs0.int_index = ifm->ifm_index;
748 ifs0.int_if_flags = ifm->ifm_flags;
749 ifs0.int_state = IS_CHECKED;
750 ifs0.int_query_time = NEVER;
751 ifs0.int_act_time = now.tv_sec;
752 ifs0.int_data.ts = now.tv_sec;
753 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets;
754 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors;
755 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets;
756 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors;
757 #ifdef sgi
758 ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops;
759 #endif
760 sdl = (struct sockaddr_dl *)(ifm + 1);
761 sdl->sdl_data[sdl->sdl_nlen] = 0;
762 strncpy(ifs0.int_name, sdl->sdl_data,
763 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen));
764 continue;
765 }
766 if (ifam->ifam_type != RTM_NEWADDR) {
767 logbad(1,"ifinit: out of sync");
768 continue;
769 }
770 rt_xaddrs(&info, (struct sockaddr *)(ifam+1),
771 (struct sockaddr *)ifam2,
772 ifam->ifam_addrs);
773
774 /* Prepare for the next address of this interface, which
775 * will be an alias.
776 * Do not output RIP or Router-Discovery packets via aliases.
777 */
778 memcpy(&ifs, &ifs0, sizeof(ifs));
779 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC);
780
781 if (INFO_IFA(&info) == 0) {
782 if (iff_up(ifs.int_if_flags)) {
783 if (!(prev_complaints & COMP_NOADDR))
784 msglog("%s has no address",
785 ifs.int_name);
786 complaints |= COMP_NOADDR;
787 }
788 continue;
789 }
790 if (INFO_IFA(&info)->sa_family != AF_INET) {
791 if (iff_up(ifs.int_if_flags)) {
792 if (!(prev_complaints & COMP_NOT_INET))
793 trace_act("%s: not AF_INET",
794 ifs.int_name);
795 complaints |= COMP_NOT_INET;
796 }
797 continue;
798 }
799
800 ifs.int_addr = S_ADDR(INFO_IFA(&info));
801
802 if (ntohl(ifs.int_addr)>>24 == 0
803 || ntohl(ifs.int_addr)>>24 == 0xff) {
804 if (iff_up(ifs.int_if_flags)) {
805 if (!(prev_complaints & COMP_BADADDR))
806 msglog("%s has a bad address",
807 ifs.int_name);
808 complaints |= COMP_BADADDR;
809 }
810 continue;
811 }
812
813 if (ifs.int_if_flags & IFF_LOOPBACK) {
814 ifs.int_state |= IS_PASSIVE | IS_NO_RIP | IS_NO_RDISC;
815 ifs.int_dstaddr = ifs.int_addr;
816 ifs.int_mask = HOST_MASK;
817 ifs.int_ripv1_mask = HOST_MASK;
818 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
819 ifs.int_net = ntohl(ifs.int_dstaddr);
820 if (!foundloopback) {
821 foundloopback = 1;
822 loopaddr = ifs.int_addr;
823 loop_rts.rts_gate = loopaddr;
824 loop_rts.rts_router = loopaddr;
825 }
826
827 } else if (ifs.int_if_flags & IFF_POINTOPOINT) {
828 if (INFO_BRD(&info) == 0
829 || INFO_BRD(&info)->sa_family != AF_INET) {
830 if (iff_up(ifs.int_if_flags)) {
831 if (!(prev_complaints & COMP_NODST))
832 msglog("%s has a bad"
833 " destination address",
834 ifs.int_name);
835 complaints |= COMP_NODST;
836 }
837 continue;
838 }
839 ifs.int_dstaddr = S_ADDR(INFO_BRD(&info));
840 if (ntohl(ifs.int_dstaddr)>>24 == 0
841 || ntohl(ifs.int_dstaddr)>>24 == 0xff) {
842 if (iff_up(ifs.int_if_flags)) {
843 if (!(prev_complaints & COMP_NODST))
844 msglog("%s has a bad"
845 " destination address",
846 ifs.int_name);
847 complaints |= COMP_NODST;
848 }
849 continue;
850 }
851 ifs.int_mask = HOST_MASK;
852 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info)));
853 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
854 ifs.int_net = ntohl(ifs.int_dstaddr);
855
856 } else {
857 if (INFO_MASK(&info) == 0) {
858 if (iff_up(ifs.int_if_flags)) {
859 if (!(prev_complaints & COMP_NOMASK))
860 msglog("%s has no netmask",
861 ifs.int_name);
862 complaints |= COMP_NOMASK;
863 }
864 continue;
865 }
866 ifs.int_dstaddr = ifs.int_addr;
867 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info)));
868 ifs.int_ripv1_mask = ifs.int_mask;
869 ifs.int_std_mask = std_mask(ifs.int_addr);
870 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask;
871 if (ifs.int_mask != ifs.int_std_mask)
872 ifs.int_state |= IS_SUBNET;
873
874 if (ifs.int_if_flags & IFF_BROADCAST) {
875 if (INFO_BRD(&info) == 0) {
876 if (iff_up(ifs.int_if_flags)) {
877 if (!(prev_complaints
878 & COMP_NOBADR))
879 msglog("%s has"
880 "no broadcast address",
881 ifs.int_name);
882 complaints |= COMP_NOBADR;
883 }
884 continue;
885 }
886 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info));
887 }
888 }
889 ifs.int_std_net = ifs.int_net & ifs.int_std_mask;
890 ifs.int_std_addr = htonl(ifs.int_std_net);
891
892 /* Use a minimum metric of one. Treat the interface metric
893 * (default 0) as an increment to the hop count of one.
894 *
895 * The metric obtained from the routing socket dump of
896 * interface addresses is wrong. It is not set by the
897 * SIOCSIFMETRIC ioctl.
898 */
899 #ifdef SIOCGIFMETRIC
900 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name));
901 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) {
902 DBGERR(1, "ioctl(SIOCGIFMETRIC)");
903 ifs.int_metric = 0;
904 } else {
905 ifs.int_metric = ifr.ifr_metric;
906 }
907 #else
908 ifs.int_metric = ifam->ifam_metric;
909 #endif
910 if (ifs.int_metric > HOPCNT_INFINITY) {
911 ifs.int_metric = 0;
912 if (!(prev_complaints & COMP_BAD_METRIC)
913 && iff_up(ifs.int_if_flags)) {
914 complaints |= COMP_BAD_METRIC;
915 msglog("%s has a metric of %d",
916 ifs.int_name, ifs.int_metric);
917 }
918 }
919
920 /* See if this is a familiar interface.
921 * If so, stop worrying about it if it is the same.
922 * Start it over if it now is to somewhere else, as happens
923 * frequently with PPP and SLIP.
924 */
925 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS)
926 ? ifs.int_addr
927 : 0));
928 if (ifp != 0) {
929 ifp->int_state |= IS_CHECKED;
930
931 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags)
932 & (IFF_BROADCAST
933 | IFF_LOOPBACK
934 | IFF_POINTOPOINT
935 | IFF_MULTICAST))
936 || 0 != ((ifp->int_state ^ ifs.int_state)
937 & IS_ALIAS)
938 || ifp->int_addr != ifs.int_addr
939 || ifp->int_brdaddr != ifs.int_brdaddr
940 || ifp->int_dstaddr != ifs.int_dstaddr
941 || ifp->int_mask != ifs.int_mask
942 || ifp->int_metric != ifs.int_metric) {
943 /* Forget old information about
944 * a changed interface.
945 */
946 trace_act("interface %s has changed",
947 ifp->int_name);
948 ifdel(ifp);
949 ifp = 0;
950 }
951 }
952
953 if (ifp != 0) {
954 /* The primary representative of an alias worries
955 * about how things are working.
956 */
957 if (ifp->int_state & IS_ALIAS)
958 continue;
959
960 /* note interfaces that have been turned off
961 */
962 if (!iff_up(ifs.int_if_flags)) {
963 if (iff_up(ifp->int_if_flags)) {
964 msglog("interface %s to %s turned off",
965 ifp->int_name,
966 naddr_ntoa(ifp->int_dstaddr));
967 if_bad(ifp);
968 ifp->int_if_flags &= ~IFF_UP;
969 } else if (now.tv_sec>(ifp->int_data.ts
970 + CHECK_BAD_INTERVAL)) {
971 trace_act("interface %s has been off"
972 " %ld seconds; forget it",
973 ifp->int_name,
974 now.tv_sec-ifp->int_data.ts);
975 ifdel(ifp);
976 }
977 continue;
978 }
979 /* or that were off and are now ok */
980 if (!iff_up(ifp->int_if_flags)) {
981 ifp->int_if_flags |= IFF_UP;
982 if_ok(ifp, "");
983 }
984
985 /* If it has been long enough,
986 * see if the interface is broken.
987 */
988 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL)
989 continue;
990
991 in = ifs.int_data.ipackets - ifp->int_data.ipackets;
992 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors;
993 out = ifs.int_data.opackets - ifp->int_data.opackets;
994 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors;
995 #ifdef sgi
996 /* Through at least IRIX 6.2, PPP and SLIP
997 * count packets dropped by the filters.
998 * But FDDI rings stuck non-operational count
999 * dropped packets as they wait for improvement.
1000 */
1001 if (!(ifp->int_if_flags & IFF_POINTOPOINT))
1002 oerr += (ifs.int_data.odrops
1003 - ifp->int_data.odrops);
1004 #endif
1005 /* If the interface just awoke, restart the counters.
1006 */
1007 if (ifp->int_data.ts == 0) {
1008 ifp->int_data = ifs.int_data;
1009 continue;
1010 }
1011 ifp->int_data = ifs.int_data;
1012
1013 /* Withhold judgment when the short error
1014 * counters wrap or the interface is reset.
1015 */
1016 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) {
1017 LIM_SEC(ifinit_timer,
1018 now.tv_sec+CHECK_BAD_INTERVAL);
1019 continue;
1020 }
1021
1022 /* Withhold judgement when there is no traffic
1023 */
1024 if (in == 0 && out == 0 && ierr == 0 && oerr == 0)
1025 continue;
1026
1027 /* It is bad if input or output is not working.
1028 * Require presistent problems before marking it dead.
1029 */
1030 if ((in <= ierr && ierr > 0)
1031 || (out <= oerr && oerr > 0)) {
1032 if (!(ifp->int_state & IS_SICK)) {
1033 trace_act("interface %s to %s"
1034 " sick: in=%d ierr=%d"
1035 " out=%d oerr=%d",
1036 ifp->int_name,
1037 naddr_ntoa(ifp->int_dstaddr),
1038 in, ierr, out, oerr);
1039 if_sick(ifp);
1040 continue;
1041 }
1042 if (!(ifp->int_state & IS_BROKE)) {
1043 msglog("interface %s to %s broken:"
1044 " in=%d ierr=%d out=%d oerr=%d",
1045 ifp->int_name,
1046 naddr_ntoa(ifp->int_dstaddr),
1047 in, ierr, out, oerr);
1048 if_bad(ifp);
1049 }
1050 continue;
1051 }
1052
1053 /* otherwise, it is active and healthy
1054 */
1055 ifp->int_act_time = now.tv_sec;
1056 if_ok(ifp, "");
1057 continue;
1058 }
1059
1060 /* This is a new interface.
1061 * If it is dead, forget it.
1062 */
1063 if (!iff_up(ifs.int_if_flags))
1064 continue;
1065
1066 /* If it duplicates an existing interface,
1067 * complain about it, mark the other one
1068 * duplicated, and forget this one.
1069 */
1070 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask,
1071 ifs.int_if_flags);
1072 if (ifp != 0) {
1073 /* Ignore duplicates of itself, caused by having
1074 * IP aliases on the same network.
1075 */
1076 if (!strcmp(ifp->int_name, ifs.int_name))
1077 continue;
1078
1079 if (!(prev_complaints & COMP_DUP)) {
1080 complaints |= COMP_DUP;
1081 msglog("%s (%s%s%s) is duplicated by"
1082 " %s (%s%s%s)",
1083 ifs.int_name,
1084 addrname(ifs.int_addr,ifs.int_mask,1),
1085 ((ifs.int_if_flags & IFF_POINTOPOINT)
1086 ? "-->" : ""),
1087 ((ifs.int_if_flags & IFF_POINTOPOINT)
1088 ? naddr_ntoa(ifs.int_dstaddr) : ""),
1089 ifp->int_name,
1090 addrname(ifp->int_addr,ifp->int_mask,1),
1091 ((ifp->int_if_flags & IFF_POINTOPOINT)
1092 ? "-->" : ""),
1093 ((ifp->int_if_flags & IFF_POINTOPOINT)
1094 ? naddr_ntoa(ifp->int_dstaddr) : ""));
1095 }
1096 ifp->int_state |= IS_DUP;
1097 continue;
1098 }
1099
1100 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST))
1101 && !(ifs.int_state & IS_PASSIVE)) {
1102 trace_act("%s is neither broadcast, point-to-point,"
1103 " nor loopback",
1104 ifs.int_name);
1105 if (!(ifs.int_state & IFF_MULTICAST))
1106 ifs.int_state |= IS_NO_RDISC;
1107 }
1108
1109
1110 /* It is new and ok. Add it to the list of interfaces
1111 */
1112 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp");
1113 memcpy(ifp, &ifs, sizeof(*ifp));
1114 get_parms(ifp);
1115 if_link(ifp);
1116 trace_if("Add", ifp);
1117
1118 /* Notice likely bad netmask.
1119 */
1120 if (!(prev_complaints & COMP_NETMASK)
1121 && !(ifp->int_if_flags & IFF_POINTOPOINT)
1122 && ifp->int_addr != RIP_DEFAULT) {
1123 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) {
1124 if (ifp1->int_mask == ifp->int_mask)
1125 continue;
1126 if (ifp1->int_if_flags & IFF_POINTOPOINT)
1127 continue;
1128 if (ifp1->int_dstaddr == RIP_DEFAULT)
1129 continue;
1130 /* ignore aliases on the right network */
1131 if (!strcmp(ifp->int_name, ifp1->int_name))
1132 continue;
1133 if (on_net(ifp->int_dstaddr,
1134 ifp1->int_net, ifp1->int_mask)
1135 || on_net(ifp1->int_dstaddr,
1136 ifp->int_net, ifp->int_mask)) {
1137 msglog("possible netmask problem"
1138 " between %s:%s and %s:%s",
1139 ifp->int_name,
1140 addrname(htonl(ifp->int_net),
1141 ifp->int_mask, 1),
1142 ifp1->int_name,
1143 addrname(htonl(ifp1->int_net),
1144 ifp1->int_mask, 1));
1145 complaints |= COMP_NETMASK;
1146 }
1147 }
1148 }
1149
1150 if (!(ifp->int_state & IS_ALIAS)) {
1151 /* Count the # of directly connected networks.
1152 */
1153 if (!(ifp->int_if_flags & IFF_LOOPBACK))
1154 tot_interfaces++;
1155 if (!IS_RIP_OFF(ifp->int_state))
1156 rip_interfaces++;
1157
1158 /* turn on router discovery and RIP If needed */
1159 if_ok_rdisc(ifp);
1160 rip_on(ifp);
1161 }
1162 }
1163
1164 /* If we are multi-homed and have at least two interfaces
1165 * listening to RIP, then output by default.
1166 */
1167 if (!supplier_set && rip_interfaces > 1)
1168 set_supplier();
1169
1170 /* If we are multi-homed, optionally advertise a route to
1171 * our main address.
1172 */
1173 if (advertise_mhome
1174 || (tot_interfaces > 1
1175 && mhome
1176 && (ifp = ifwithaddr(myaddr, 0, 0)) != 0
1177 && foundloopback)) {
1178 advertise_mhome = 1;
1179 rt = rtget(myaddr, HOST_MASK);
1180 if (rt != 0) {
1181 if (rt->rt_ifp != ifp
1182 || rt->rt_router != loopaddr) {
1183 rtdelete(rt);
1184 rt = 0;
1185 } else {
1186 loop_rts.rts_ifp = ifp;
1187 loop_rts.rts_metric = 0;
1188 loop_rts.rts_time = rt->rt_time;
1189 rtchange(rt, rt->rt_state | RS_MHOME,
1190 &loop_rts, 0);
1191 }
1192 }
1193 if (rt == 0) {
1194 loop_rts.rts_ifp = ifp;
1195 loop_rts.rts_metric = 0;
1196 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts);
1197 }
1198 }
1199
1200 for (ifp = ifnet; ifp != 0; ifp = ifp1) {
1201 ifp1 = ifp->int_next; /* because we may delete it */
1202
1203 /* Forget any interfaces that have disappeared.
1204 */
1205 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) {
1206 trace_act("interface %s has disappeared",
1207 ifp->int_name);
1208 ifdel(ifp);
1209 continue;
1210 }
1211
1212 if ((ifp->int_state & IS_BROKE)
1213 && !(ifp->int_state & IS_PASSIVE))
1214 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
1215
1216 /* If we ever have a RIPv1 interface, assume we always will.
1217 * It might come back if it ever goes away.
1218 */
1219 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier)
1220 have_ripv1_out = 1;
1221 if (!(ifp->int_state & IS_NO_RIPV1_IN))
1222 have_ripv1_in = 1;
1223 }
1224
1225 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
1226 /* Ensure there is always a network route for interfaces,
1227 * after any dead interfaces have been deleted, which
1228 * might affect routes for point-to-point links.
1229 */
1230 if (!addrouteforif(ifp))
1231 continue;
1232
1233 /* Add routes to the local end of point-to-point interfaces
1234 * using loopback.
1235 */
1236 if ((ifp->int_if_flags & IFF_POINTOPOINT)
1237 && !(ifp->int_state & IS_REMOTE)
1238 && foundloopback) {
1239 /* Delete any routes to the network address through
1240 * foreign routers. Remove even static routes.
1241 */
1242 del_static(ifp->int_addr, HOST_MASK, 0, 0);
1243 rt = rtget(ifp->int_addr, HOST_MASK);
1244 if (rt != 0 && rt->rt_router != loopaddr) {
1245 rtdelete(rt);
1246 rt = 0;
1247 }
1248 if (rt != 0) {
1249 if (!(rt->rt_state & RS_LOCAL)
1250 || rt->rt_metric > ifp->int_metric) {
1251 ifp1 = ifp;
1252 } else {
1253 ifp1 = rt->rt_ifp;
1254 }
1255 loop_rts.rts_ifp = ifp1;
1256 loop_rts.rts_metric = 0;
1257 loop_rts.rts_time = rt->rt_time;
1258 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN)
1259 | (RS_IF|RS_LOCAL)),
1260 &loop_rts, 0);
1261 } else {
1262 loop_rts.rts_ifp = ifp;
1263 loop_rts.rts_metric = 0;
1264 rtadd(ifp->int_addr, HOST_MASK,
1265 (RS_IF | RS_LOCAL), &loop_rts);
1266 }
1267 }
1268 }
1269
1270 /* add the authority routes */
1271 for (intnetp = intnets; intnetp!=0; intnetp = intnetp->intnet_next) {
1272 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask);
1273 if (rt != 0
1274 && !(rt->rt_state & RS_NO_NET_SYN)
1275 && !(rt->rt_state & RS_NET_INT)) {
1276 rtdelete(rt);
1277 rt = 0;
1278 }
1279 if (rt == 0) {
1280 loop_rts.rts_ifp = 0;
1281 loop_rts.rts_metric = intnetp->intnet_metric-1;
1282 rtadd(intnetp->intnet_addr, intnetp->intnet_mask,
1283 RS_NET_SYN | RS_NET_INT, &loop_rts);
1284 }
1285 }
1286
1287 prev_complaints = complaints;
1288 }
1289
1290
1291 static void
1292 check_net_syn(struct interface *ifp)
1293 {
1294 struct rt_entry *rt;
1295 static struct rt_spare new;
1296
1297
1298 /* Turn on the need to automatically synthesize a network route
1299 * for this interface only if we are running RIPv1 on some other
1300 * interface that is on a different class-A,B,or C network.
1301 */
1302 if (have_ripv1_out || have_ripv1_in) {
1303 ifp->int_state |= IS_NEED_NET_SYN;
1304 rt = rtget(ifp->int_std_addr, ifp->int_std_mask);
1305 if (rt != 0
1306 && 0 == (rt->rt_state & RS_NO_NET_SYN)
1307 && (!(rt->rt_state & RS_NET_SYN)
1308 || rt->rt_metric > ifp->int_metric)) {
1309 rtdelete(rt);
1310 rt = 0;
1311 }
1312 if (rt == 0) {
1313 new.rts_ifp = ifp;
1314 new.rts_gate = ifp->int_addr;
1315 new.rts_router = ifp->int_addr;
1316 new.rts_metric = ifp->int_metric;
1317 rtadd(ifp->int_std_addr, ifp->int_std_mask,
1318 RS_NET_SYN, &new);
1319 }
1320
1321 } else {
1322 ifp->int_state &= ~IS_NEED_NET_SYN;
1323
1324 rt = rtget(ifp->int_std_addr,
1325 ifp->int_std_mask);
1326 if (rt != 0
1327 && (rt->rt_state & RS_NET_SYN)
1328 && rt->rt_ifp == ifp)
1329 rtbad_sub(rt);
1330 }
1331 }
1332
1333
1334 /* Add route for interface if not currently installed.
1335 * Create route to other end if a point-to-point link,
1336 * otherwise a route to this (sub)network.
1337 */
1338 int /* 0=bad interface */
1339 addrouteforif(struct interface *ifp)
1340 {
1341 struct rt_entry *rt;
1342 static struct rt_spare new;
1343 naddr dst;
1344
1345
1346 /* skip sick interfaces
1347 */
1348 if (ifp->int_state & IS_BROKE)
1349 return 0;
1350
1351 /* If the interface on a subnet, then install a RIPv1 route to
1352 * the network as well (unless it is sick).
1353 */
1354 if (ifp->int_state & IS_SUBNET)
1355 check_net_syn(ifp);
1356
1357 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK))
1358 ? ifp->int_dstaddr
1359 : htonl(ifp->int_net));
1360
1361 new.rts_ifp = ifp;
1362 new.rts_router = ifp->int_addr;
1363 new.rts_gate = ifp->int_addr;
1364 new.rts_metric = ifp->int_metric;
1365 new.rts_time = now.tv_sec;
1366
1367 /* If we are going to send packets to the gateway,
1368 * it must be reachable using our physical interfaces
1369 */
1370 if ((ifp->int_state & IS_REMOTE)
1371 && !(ifp->int_state & IS_EXTERNAL)
1372 && !check_remote(ifp))
1373 return 0;
1374
1375 /* We are finished if the correct main interface route exists.
1376 * The right route must be for the right interface, not synthesized
1377 * from a subnet, be a "gateway" or not as appropriate, and so forth.
1378 */
1379 del_static(dst, ifp->int_mask, 0, 0);
1380 rt = rtget(dst, ifp->int_mask);
1381 if (rt != 0) {
1382 if ((rt->rt_ifp != ifp
1383 || rt->rt_router != ifp->int_addr)
1384 && (!(ifp->int_state & IS_DUP)
1385 || rt->rt_ifp == 0
1386 || (rt->rt_ifp->int_state & IS_BROKE))) {
1387 rtdelete(rt);
1388 rt = 0;
1389 } else {
1390 rtchange(rt, ((rt->rt_state | RS_IF)
1391 & ~(RS_NET_SYN | RS_LOCAL)),
1392 &new, 0);
1393 }
1394 }
1395 if (rt == 0) {
1396 if (ifp->int_transitions++ > 0)
1397 trace_act("re-install interface %s",
1398 ifp->int_name);
1399
1400 rtadd(dst, ifp->int_mask, RS_IF, &new);
1401 }
1402
1403 return 1;
1404 }
DragonFly BSD