2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * $FreeBSD: src/sbin/routed/if.c,v 1.6.2.1 2000/08/14 17:00:03 sheldonh Exp $
37 #include "pathnames.h"
39 #if !defined(sgi) && !defined(__NetBSD__)
40 static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93";
41 #elif defined(__NetBSD__)
42 #include <sys/cdefs.h>
46 struct interface *ifnet; /* all interfaces */
48 /* hash table for all interfaces, big enough to tolerate ridiculous
49 * numbers of IP aliases. Crazy numbers of aliases such as 7000
50 * still will not do well, but not just in looking up interfaces
53 #define AHASH_LEN 211 /* must be prime */
54 #define AHASH(a) &ahash_tbl[(a)%AHASH_LEN]
55 struct interface *ahash_tbl[AHASH_LEN];
57 #define BHASH_LEN 211 /* must be prime */
58 #define BHASH(a) &bhash_tbl[(a)%BHASH_LEN]
59 struct interface *bhash_tbl[BHASH_LEN];
61 struct interface *remote_if; /* remote interfaces */
63 /* hash for physical interface names.
64 * Assume there are never more 100 or 200 real interfaces, and that
65 * aliases are put on the end of the hash chains.
68 struct interface *nhash_tbl[NHASH_LEN];
70 int tot_interfaces; /* # of remote and local interfaces */
71 int rip_interfaces; /* # of interfaces doing RIP */
72 int foundloopback; /* valid flag for loopaddr */
73 naddr loopaddr; /* our address on loopback */
74 struct rt_spare loop_rts;
76 struct timeval ifinit_timer;
77 static struct timeval last_ifinit;
78 #define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \
79 && last_ifinit.tv_usec == now.tv_usec \
80 && timercmp(&ifinit_timer, &now, >))
82 int have_ripv1_out; /* have a RIPv1 interface */
86 static struct interface**
91 for (i = 0; *p != '\0'; p++) {
92 i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1);
95 return &nhash_tbl[i % NHASH_LEN];
99 /* Link a new interface into the lists and hash tables.
102 if_link(struct interface *ifp)
104 struct interface **hifp;
106 ifp->int_prev = &ifnet;
107 ifp->int_next = ifnet;
109 ifnet->int_prev = &ifp->int_next;
112 hifp = AHASH(ifp->int_addr);
113 ifp->int_ahash_prev = hifp;
114 if ((ifp->int_ahash = *hifp) != NULL)
115 (*hifp)->int_ahash_prev = &ifp->int_ahash;
118 if (ifp->int_if_flags & IFF_BROADCAST) {
119 hifp = BHASH(ifp->int_brdaddr);
120 ifp->int_bhash_prev = hifp;
121 if ((ifp->int_bhash = *hifp) != NULL)
122 (*hifp)->int_bhash_prev = &ifp->int_bhash;
126 if (ifp->int_state & IS_REMOTE) {
127 ifp->int_rlink_prev = &remote_if;
128 ifp->int_rlink = remote_if;
129 if (remote_if != NULL)
130 remote_if->int_rlink_prev = &ifp->int_rlink;
134 hifp = nhash(ifp->int_name);
135 if (ifp->int_state & IS_ALIAS) {
136 /* put aliases on the end of the hash chain */
137 while (*hifp != NULL)
138 hifp = &(*hifp)->int_nhash;
140 ifp->int_nhash_prev = hifp;
141 if ((ifp->int_nhash = *hifp) != NULL)
142 (*hifp)->int_nhash_prev = &ifp->int_nhash;
147 /* Find the interface with an address
150 ifwithaddr(naddr addr,
151 int bcast, /* notice IFF_BROADCAST address */
152 int remote) /* include IS_REMOTE interfaces */
154 struct interface *ifp, *possible = NULL;
156 remote = (remote == 0) ? IS_REMOTE : 0;
158 for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) {
159 if (ifp->int_addr != addr)
161 if ((ifp->int_state & remote) != 0)
163 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
168 if (possible || !bcast)
171 for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) {
172 if (ifp->int_brdaddr != addr)
174 if ((ifp->int_state & remote) != 0)
176 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
185 /* find the interface with a name
188 ifwithname(char *name, /* "ec0" or whatever */
189 naddr addr) /* 0 or network address */
191 struct interface *ifp;
194 for (ifp = *nhash(name); ifp != NULL; ifp = ifp->int_nhash) {
195 /* If the network address is not specified,
196 * ignore any alias interfaces. Otherwise, look
197 * for the interface with the target name and address.
199 if (!strcmp(ifp->int_name, name)
200 && ((addr == 0 && !(ifp->int_state & IS_ALIAS))
201 || (ifp->int_addr == addr)))
205 /* If there is no known interface, maybe there is a
206 * new interface. So just once look for new interfaces.
208 if (IF_RESCAN_DELAY())
216 ifwithindex(u_short idx, int rescan_ok)
218 struct interface *ifp;
221 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) {
222 if (ifp->int_index == idx)
226 /* If there is no known interface, maybe there is a
227 * new interface. So just once look for new interfaces.
230 || IF_RESCAN_DELAY())
237 /* Find an interface from which the specified address
238 * should have come from. Used for figuring out which
239 * interface a packet came in on.
244 struct interface *ifp, *maybe;
248 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
249 if (ifp->int_if_flags & IFF_POINTOPOINT) {
250 /* finished with a match */
251 if (ifp->int_dstaddr == addr)
255 /* finished with an exact match */
256 if (ifp->int_addr == addr)
259 /* Look for the longest approximate match.
261 if (on_net(addr, ifp->int_net, ifp->int_mask)
263 || ifp->int_mask > maybe->int_mask))
269 || IF_RESCAN_DELAY())
272 /* If there is no known interface, maybe there is a
273 * new interface. So just once look for new interfaces.
280 /* Return the classical netmask for an IP address.
282 naddr /* host byte order */
283 std_mask(naddr addr) /* network byte order */
285 addr = ntohl(addr); /* was a host, not a network */
287 if (addr == 0) /* default route has mask 0 */
290 return IN_CLASSA_NET;
292 return IN_CLASSB_NET;
293 return IN_CLASSC_NET;
297 /* Find the netmask that would be inferred by RIPv1 listeners
298 * on the given interface for a given network.
299 * If no interface is specified, look for the best fitting interface.
302 ripv1_mask_net(naddr addr, /* in network byte order */
303 struct interface *ifp) /* as seen on this interface */
308 if (addr == 0) /* default always has 0 mask */
311 if (ifp != NULL && ifp->int_ripv1_mask != HOST_MASK) {
312 /* If the target network is that of the associated interface
313 * on which it arrived, then use the netmask of the interface.
315 if (on_net(addr, ifp->int_net, ifp->int_std_mask))
316 mask = ifp->int_ripv1_mask;
319 /* Examine all interfaces, and if it the target seems
320 * to have the same network number of an interface, use the
321 * netmask of that interface. If there is more than one
322 * such interface, prefer the interface with the longest
325 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) {
326 if (on_net(addr, ifp->int_std_net, ifp->int_std_mask)
327 && ifp->int_ripv1_mask > mask
328 && ifp->int_ripv1_mask != HOST_MASK)
329 mask = ifp->int_ripv1_mask;
334 /* check special definitions */
336 for (r1p = r1nets; r1p != NULL; r1p = r1p->r1net_next) {
337 if (on_net(addr, r1p->r1net_net, r1p->r1net_match)
338 && r1p->r1net_mask > mask)
339 mask = r1p->r1net_mask;
342 /* Otherwise, make the classic A/B/C guess.
345 mask = std_mask(addr);
353 ripv1_mask_host(naddr addr, /* in network byte order */
354 struct interface *ifp) /* as seen on this interface */
356 naddr mask = ripv1_mask_net(addr, ifp);
359 /* If the computed netmask does not mask the address,
360 * then assume it is a host address
362 if ((ntohl(addr) & ~mask) != 0)
368 /* See if a IP address looks reasonable as a destination
371 check_dst(naddr addr)
375 if (IN_CLASSA(addr)) {
377 return 1; /* default */
379 addr >>= IN_CLASSA_NSHIFT;
380 return (addr != 0 && addr != IN_LOOPBACKNET);
383 return (IN_CLASSB(addr) || IN_CLASSC(addr));
387 /* See a new interface duplicates an existing interface.
390 check_dup(naddr addr, /* IP address, so network byte order */
391 naddr dstaddr, /* ditto */
392 naddr mask, /* mask, so host byte order */
395 struct interface *ifp;
397 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) {
398 if (ifp->int_mask != mask)
401 if (!iff_up(ifp->int_if_flags))
404 /* The local address can only be shared with a point-to-point
407 if (ifp->int_addr == addr
408 && (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0))
411 if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask))
418 /* See that a remote gateway is reachable.
419 * Note that the answer can change as real interfaces come and go.
422 check_remote(struct interface *ifp)
426 /* do not worry about other kinds */
427 if (!(ifp->int_state & IS_REMOTE))
430 rt = rtfind(ifp->int_addr);
433 &&on_net(ifp->int_addr,
434 rt->rt_ifp->int_net, rt->rt_ifp->int_mask))
437 /* the gateway cannot be reached directly from one of our
440 if (!(ifp->int_state & IS_BROKE)) {
441 msglog("unreachable gateway %s in "_PATH_GATEWAYS,
442 naddr_ntoa(ifp->int_addr));
449 /* Delete an interface.
452 ifdel(struct interface *ifp)
455 struct interface *ifp1;
458 trace_if("Del", ifp);
460 ifp->int_state |= IS_BROKE;
462 /* unlink the interface
464 *ifp->int_prev = ifp->int_next;
465 if (ifp->int_next != 0)
466 ifp->int_next->int_prev = ifp->int_prev;
467 *ifp->int_ahash_prev = ifp->int_ahash;
468 if (ifp->int_ahash != 0)
469 ifp->int_ahash->int_ahash_prev = ifp->int_ahash_prev;
470 *ifp->int_nhash_prev = ifp->int_nhash;
471 if (ifp->int_nhash != 0)
472 ifp->int_nhash->int_nhash_prev = ifp->int_nhash_prev;
473 if (ifp->int_if_flags & IFF_BROADCAST) {
474 *ifp->int_bhash_prev = ifp->int_bhash;
475 if (ifp->int_bhash != 0)
476 ifp->int_bhash->int_bhash_prev = ifp->int_bhash_prev;
478 if (ifp->int_state & IS_REMOTE) {
479 *ifp->int_rlink_prev = ifp->int_rlink;
480 if (ifp->int_rlink != 0)
481 ifp->int_rlink->int_rlink_prev = ifp->int_rlink_prev;
484 if (!(ifp->int_state & IS_ALIAS)) {
485 /* delete aliases when the main interface dies
487 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
489 && !strcmp(ifp->int_name, ifp1->int_name))
493 if ((ifp->int_if_flags & IFF_MULTICAST)
495 && !(ifp->int_if_flags & IFF_POINTOPOINT)
498 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
499 m.imr_interface.s_addr = ((ifp->int_if_flags
503 if (setsockopt(rip_sock,IPPROTO_IP,IP_DROP_MEMBERSHIP,
505 && errno != EADDRNOTAVAIL
507 LOGERR("setsockopt(IP_DROP_MEMBERSHIP RIP)");
508 if (rip_sock_mcast == ifp)
511 if (ifp->int_rip_sock >= 0) {
512 close(ifp->int_rip_sock);
513 ifp->int_rip_sock = -1;
518 if (!IS_RIP_OFF(ifp->int_state))
521 /* Zap all routes associated with this interface.
522 * Assume routes just using gateways beyond this interface
523 * will timeout naturally, and have probably already died.
525 rn_walktree(rhead, walk_bad, 0);
527 set_rdisc_mg(ifp, 0);
535 /* Mark an interface ill.
538 if_sick(struct interface *ifp)
540 if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) {
541 ifp->int_state |= IS_SICK;
542 ifp->int_act_time = NEVER;
543 trace_if("Chg", ifp);
545 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
550 /* Mark an interface dead.
553 if_bad(struct interface *ifp)
555 struct interface *ifp1;
558 if (ifp->int_state & IS_BROKE)
561 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
563 ifp->int_state |= (IS_BROKE | IS_SICK);
564 ifp->int_act_time = NEVER;
565 ifp->int_query_time = NEVER;
566 ifp->int_data.ts = now.tv_sec;
568 trace_if("Chg", ifp);
570 if (!(ifp->int_state & IS_ALIAS)) {
571 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
573 && !strcmp(ifp->int_name, ifp1->int_name))
576 rn_walktree(rhead, walk_bad, 0);
582 /* Mark an interface alive
584 int /* 1=it was dead */
585 if_ok(struct interface *ifp,
588 struct interface *ifp1;
591 if (!(ifp->int_state & IS_BROKE)) {
592 if (ifp->int_state & IS_SICK) {
593 trace_act("%sinterface %s to %s working better",
595 ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
596 ifp->int_state &= ~IS_SICK;
601 msglog("%sinterface %s to %s restored",
602 type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
603 ifp->int_state &= ~(IS_BROKE | IS_SICK);
604 ifp->int_data.ts = 0;
606 if (!(ifp->int_state & IS_ALIAS)) {
607 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
609 && !strcmp(ifp->int_name, ifp1->int_name))
615 if (ifp->int_state & IS_REMOTE) {
616 if (!addrouteforif(ifp))
623 /* disassemble routing message
626 rt_xaddrs(struct rt_addrinfo *info,
628 struct sockaddr *lim,
633 static struct sockaddr sa_zero;
636 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
637 : sizeof(__uint64_t))
639 #define ROUNDUP(a) RT_ROUNDUP(a)
643 memset(info, 0, sizeof(*info));
644 info->rti_addrs = addrs;
645 for (i = 0; i < RTAX_MAX && sa < lim; i++) {
646 if ((addrs & (1 << i)) == 0)
649 info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero;
650 sa = (struct sockaddr *)((char*)(sa)
651 + ROUNDUP(sa->sa_len));
653 info->rti_info[i] = sa;
654 sa = (struct sockaddr *)((char*)(sa)
655 + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
661 /* Find the network interfaces which have configured themselves.
662 * This must be done regularly, if only for extra addresses
663 * that come and go on interfaces.
668 static char *sysctl_buf;
669 static size_t sysctl_buf_size = 0;
671 static u_int prev_complaints = 0;
672 # define COMP_NOT_INET 0x001
673 # define COMP_NOADDR 0x002
674 # define COMP_BADADDR 0x004
675 # define COMP_NODST 0x008
676 # define COMP_NOBADR 0x010
677 # define COMP_NOMASK 0x020
678 # define COMP_DUP 0x040
679 # define COMP_BAD_METRIC 0x080
680 # define COMP_NETMASK 0x100
682 struct interface ifs, ifs0, *ifp, *ifp1;
686 struct if_msghdr *ifm;
687 struct ifa_msghdr *ifam, *ifam_lim, *ifam2;
688 int in, ierr, out, oerr;
689 struct intnet *intnetp;
690 struct rt_addrinfo info;
697 ifinit_timer.tv_sec = now.tv_sec + (supplier
699 : CHECK_QUIET_INTERVAL);
701 /* mark all interfaces so we can get rid of those that disappear */
702 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next)
703 ifp->int_state &= ~(IS_CHECKED | IS_DUP);
705 /* Fetch the interface list, without too many system calls
706 * since we do it repeatedly.
712 mib[4] = NET_RT_IFLIST;
715 if ((needed = sysctl_buf_size) != 0) {
716 if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0)
718 /* retry if the table grew */
719 if (errno != ENOMEM && errno != EFAULT)
720 BADERR(1, "ifinit: sysctl(RT_IFLIST)");
724 if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
725 BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate");
726 sysctl_buf = rtmalloc(sysctl_buf_size = needed,
730 ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed);
731 for (ifam = (struct ifa_msghdr *)sysctl_buf;
735 ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen);
737 if (ifam->ifam_type == RTM_IFINFO) {
738 struct sockaddr_dl *sdl;
740 ifm = (struct if_msghdr *)ifam;
741 /* make prototype structure for the IP aliases
743 memset(&ifs0, 0, sizeof(ifs0));
744 ifs0.int_rip_sock = -1;
745 ifs0.int_index = ifm->ifm_index;
746 ifs0.int_if_flags = ifm->ifm_flags;
747 ifs0.int_state = IS_CHECKED;
748 ifs0.int_query_time = NEVER;
749 ifs0.int_act_time = now.tv_sec;
750 ifs0.int_data.ts = now.tv_sec;
751 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets;
752 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors;
753 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets;
754 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors;
756 ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops;
758 sdl = (struct sockaddr_dl *)(ifm + 1);
759 sdl->sdl_data[sdl->sdl_nlen] = 0;
760 strncpy(ifs0.int_name, sdl->sdl_data,
761 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen));
764 if (ifam->ifam_type != RTM_NEWADDR) {
765 logbad(1,"ifinit: out of sync");
768 rt_xaddrs(&info, (struct sockaddr *)(ifam+1),
769 (struct sockaddr *)ifam2,
772 /* Prepare for the next address of this interface, which
774 * Do not output RIP or Router-Discovery packets via aliases.
776 memcpy(&ifs, &ifs0, sizeof(ifs));
777 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC);
779 if (INFO_IFA(&info) == 0) {
780 if (iff_up(ifs.int_if_flags)) {
781 if (!(prev_complaints & COMP_NOADDR))
782 msglog("%s has no address",
784 complaints |= COMP_NOADDR;
788 if (INFO_IFA(&info)->sa_family != AF_INET) {
789 if (iff_up(ifs.int_if_flags)) {
790 if (!(prev_complaints & COMP_NOT_INET))
791 trace_act("%s: not AF_INET",
793 complaints |= COMP_NOT_INET;
798 ifs.int_addr = S_ADDR(INFO_IFA(&info));
800 if (ntohl(ifs.int_addr)>>24 == 0
801 || ntohl(ifs.int_addr)>>24 == 0xff) {
802 if (iff_up(ifs.int_if_flags)) {
803 if (!(prev_complaints & COMP_BADADDR))
804 msglog("%s has a bad address",
806 complaints |= COMP_BADADDR;
811 if (ifs.int_if_flags & IFF_LOOPBACK) {
812 ifs.int_state |= IS_PASSIVE | IS_NO_RIP | IS_NO_RDISC;
813 ifs.int_dstaddr = ifs.int_addr;
814 ifs.int_mask = HOST_MASK;
815 ifs.int_ripv1_mask = HOST_MASK;
816 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
817 ifs.int_net = ntohl(ifs.int_dstaddr);
818 if (!foundloopback) {
820 loopaddr = ifs.int_addr;
821 loop_rts.rts_gate = loopaddr;
822 loop_rts.rts_router = loopaddr;
825 } else if (ifs.int_if_flags & IFF_POINTOPOINT) {
826 if (INFO_BRD(&info) == 0
827 || INFO_BRD(&info)->sa_family != AF_INET) {
828 if (iff_up(ifs.int_if_flags)) {
829 if (!(prev_complaints & COMP_NODST))
830 msglog("%s has a bad"
831 " destination address",
833 complaints |= COMP_NODST;
837 ifs.int_dstaddr = S_ADDR(INFO_BRD(&info));
838 if (ntohl(ifs.int_dstaddr)>>24 == 0
839 || ntohl(ifs.int_dstaddr)>>24 == 0xff) {
840 if (iff_up(ifs.int_if_flags)) {
841 if (!(prev_complaints & COMP_NODST))
842 msglog("%s has a bad"
843 " destination address",
845 complaints |= COMP_NODST;
849 ifs.int_mask = HOST_MASK;
850 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info)));
851 ifs.int_std_mask = std_mask(ifs.int_dstaddr);
852 ifs.int_net = ntohl(ifs.int_dstaddr);
855 if (INFO_MASK(&info) == 0) {
856 if (iff_up(ifs.int_if_flags)) {
857 if (!(prev_complaints & COMP_NOMASK))
858 msglog("%s has no netmask",
860 complaints |= COMP_NOMASK;
864 ifs.int_dstaddr = ifs.int_addr;
865 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info)));
866 ifs.int_ripv1_mask = ifs.int_mask;
867 ifs.int_std_mask = std_mask(ifs.int_addr);
868 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask;
869 if (ifs.int_mask != ifs.int_std_mask)
870 ifs.int_state |= IS_SUBNET;
872 if (ifs.int_if_flags & IFF_BROADCAST) {
873 if (INFO_BRD(&info) == 0) {
874 if (iff_up(ifs.int_if_flags)) {
875 if (!(prev_complaints
878 "no broadcast address",
880 complaints |= COMP_NOBADR;
884 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info));
887 ifs.int_std_net = ifs.int_net & ifs.int_std_mask;
888 ifs.int_std_addr = htonl(ifs.int_std_net);
890 /* Use a minimum metric of one. Treat the interface metric
891 * (default 0) as an increment to the hop count of one.
893 * The metric obtained from the routing socket dump of
894 * interface addresses is wrong. It is not set by the
895 * SIOCSIFMETRIC ioctl.
898 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name));
899 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) {
900 DBGERR(1, "ioctl(SIOCGIFMETRIC)");
903 ifs.int_metric = ifr.ifr_metric;
906 ifs.int_metric = ifam->ifam_metric;
908 if (ifs.int_metric > HOPCNT_INFINITY) {
910 if (!(prev_complaints & COMP_BAD_METRIC)
911 && iff_up(ifs.int_if_flags)) {
912 complaints |= COMP_BAD_METRIC;
913 msglog("%s has a metric of %d",
914 ifs.int_name, ifs.int_metric);
918 /* See if this is a familiar interface.
919 * If so, stop worrying about it if it is the same.
920 * Start it over if it now is to somewhere else, as happens
921 * frequently with PPP and SLIP.
923 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS)
927 ifp->int_state |= IS_CHECKED;
929 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags)
934 || 0 != ((ifp->int_state ^ ifs.int_state)
936 || ifp->int_addr != ifs.int_addr
937 || ifp->int_brdaddr != ifs.int_brdaddr
938 || ifp->int_dstaddr != ifs.int_dstaddr
939 || ifp->int_mask != ifs.int_mask
940 || ifp->int_metric != ifs.int_metric) {
941 /* Forget old information about
942 * a changed interface.
944 trace_act("interface %s has changed",
952 /* The primary representative of an alias worries
953 * about how things are working.
955 if (ifp->int_state & IS_ALIAS)
958 /* note interfaces that have been turned off
960 if (!iff_up(ifs.int_if_flags)) {
961 if (iff_up(ifp->int_if_flags)) {
962 msglog("interface %s to %s turned off",
964 naddr_ntoa(ifp->int_dstaddr));
966 ifp->int_if_flags &= ~IFF_UP;
967 } else if (now.tv_sec>(ifp->int_data.ts
968 + CHECK_BAD_INTERVAL)) {
969 trace_act("interface %s has been off"
970 " %ld seconds; forget it",
972 now.tv_sec-ifp->int_data.ts);
977 /* or that were off and are now ok */
978 if (!iff_up(ifp->int_if_flags)) {
979 ifp->int_if_flags |= IFF_UP;
983 /* If it has been long enough,
984 * see if the interface is broken.
986 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL)
989 in = ifs.int_data.ipackets - ifp->int_data.ipackets;
990 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors;
991 out = ifs.int_data.opackets - ifp->int_data.opackets;
992 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors;
994 /* Through at least IRIX 6.2, PPP and SLIP
995 * count packets dropped by the filters.
996 * But FDDI rings stuck non-operational count
997 * dropped packets as they wait for improvement.
999 if (!(ifp->int_if_flags & IFF_POINTOPOINT))
1000 oerr += (ifs.int_data.odrops
1001 - ifp->int_data.odrops);
1003 /* If the interface just awoke, restart the counters.
1005 if (ifp->int_data.ts == 0) {
1006 ifp->int_data = ifs.int_data;
1009 ifp->int_data = ifs.int_data;
1011 /* Withhold judgment when the short error
1012 * counters wrap or the interface is reset.
1014 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) {
1015 LIM_SEC(ifinit_timer,
1016 now.tv_sec+CHECK_BAD_INTERVAL);
1020 /* Withhold judgement when there is no traffic
1022 if (in == 0 && out == 0 && ierr == 0 && oerr == 0)
1025 /* It is bad if input or output is not working.
1026 * Require presistent problems before marking it dead.
1028 if ((in <= ierr && ierr > 0)
1029 || (out <= oerr && oerr > 0)) {
1030 if (!(ifp->int_state & IS_SICK)) {
1031 trace_act("interface %s to %s"
1032 " sick: in=%d ierr=%d"
1035 naddr_ntoa(ifp->int_dstaddr),
1036 in, ierr, out, oerr);
1040 if (!(ifp->int_state & IS_BROKE)) {
1041 msglog("interface %s to %s broken:"
1042 " in=%d ierr=%d out=%d oerr=%d",
1044 naddr_ntoa(ifp->int_dstaddr),
1045 in, ierr, out, oerr);
1051 /* otherwise, it is active and healthy
1053 ifp->int_act_time = now.tv_sec;
1058 /* This is a new interface.
1059 * If it is dead, forget it.
1061 if (!iff_up(ifs.int_if_flags))
1064 /* If it duplicates an existing interface,
1065 * complain about it, mark the other one
1066 * duplicated, and forget this one.
1068 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask,
1071 /* Ignore duplicates of itself, caused by having
1072 * IP aliases on the same network.
1074 if (!strcmp(ifp->int_name, ifs.int_name))
1077 if (!(prev_complaints & COMP_DUP)) {
1078 complaints |= COMP_DUP;
1079 msglog("%s (%s%s%s) is duplicated by"
1082 addrname(ifs.int_addr,ifs.int_mask,1),
1083 ((ifs.int_if_flags & IFF_POINTOPOINT)
1085 ((ifs.int_if_flags & IFF_POINTOPOINT)
1086 ? naddr_ntoa(ifs.int_dstaddr) : ""),
1088 addrname(ifp->int_addr,ifp->int_mask,1),
1089 ((ifp->int_if_flags & IFF_POINTOPOINT)
1091 ((ifp->int_if_flags & IFF_POINTOPOINT)
1092 ? naddr_ntoa(ifp->int_dstaddr) : ""));
1094 ifp->int_state |= IS_DUP;
1098 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST))
1099 && !(ifs.int_state & IS_PASSIVE)) {
1100 trace_act("%s is neither broadcast, point-to-point,"
1103 if (!(ifs.int_state & IFF_MULTICAST))
1104 ifs.int_state |= IS_NO_RDISC;
1108 /* It is new and ok. Add it to the list of interfaces
1110 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp");
1111 memcpy(ifp, &ifs, sizeof(*ifp));
1114 trace_if("Add", ifp);
1116 /* Notice likely bad netmask.
1118 if (!(prev_complaints & COMP_NETMASK)
1119 && !(ifp->int_if_flags & IFF_POINTOPOINT)
1120 && ifp->int_addr != RIP_DEFAULT) {
1121 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) {
1122 if (ifp1->int_mask == ifp->int_mask)
1124 if (ifp1->int_if_flags & IFF_POINTOPOINT)
1126 if (ifp1->int_dstaddr == RIP_DEFAULT)
1128 /* ignore aliases on the right network */
1129 if (!strcmp(ifp->int_name, ifp1->int_name))
1131 if (on_net(ifp->int_dstaddr,
1132 ifp1->int_net, ifp1->int_mask)
1133 || on_net(ifp1->int_dstaddr,
1134 ifp->int_net, ifp->int_mask)) {
1135 msglog("possible netmask problem"
1136 " between %s:%s and %s:%s",
1138 addrname(htonl(ifp->int_net),
1141 addrname(htonl(ifp1->int_net),
1142 ifp1->int_mask, 1));
1143 complaints |= COMP_NETMASK;
1148 if (!(ifp->int_state & IS_ALIAS)) {
1149 /* Count the # of directly connected networks.
1151 if (!(ifp->int_if_flags & IFF_LOOPBACK))
1153 if (!IS_RIP_OFF(ifp->int_state))
1156 /* turn on router discovery and RIP If needed */
1162 /* If we are multi-homed and have at least two interfaces
1163 * listening to RIP, then output by default.
1165 if (!supplier_set && rip_interfaces > 1)
1168 /* If we are multi-homed, optionally advertise a route to
1172 || (tot_interfaces > 1
1174 && (ifp = ifwithaddr(myaddr, 0, 0)) != NULL
1175 && foundloopback)) {
1176 advertise_mhome = 1;
1177 rt = rtget(myaddr, HOST_MASK);
1179 if (rt->rt_ifp != ifp
1180 || rt->rt_router != loopaddr) {
1184 loop_rts.rts_ifp = ifp;
1185 loop_rts.rts_metric = 0;
1186 loop_rts.rts_time = rt->rt_time;
1187 rtchange(rt, rt->rt_state | RS_MHOME,
1192 loop_rts.rts_ifp = ifp;
1193 loop_rts.rts_metric = 0;
1194 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts);
1198 for (ifp = ifnet; ifp != NULL; ifp = ifp1) {
1199 ifp1 = ifp->int_next; /* because we may delete it */
1201 /* Forget any interfaces that have disappeared.
1203 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) {
1204 trace_act("interface %s has disappeared",
1210 if ((ifp->int_state & IS_BROKE)
1211 && !(ifp->int_state & IS_PASSIVE))
1212 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
1214 /* If we ever have a RIPv1 interface, assume we always will.
1215 * It might come back if it ever goes away.
1217 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier)
1219 if (!(ifp->int_state & IS_NO_RIPV1_IN))
1223 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) {
1224 /* Ensure there is always a network route for interfaces,
1225 * after any dead interfaces have been deleted, which
1226 * might affect routes for point-to-point links.
1228 if (!addrouteforif(ifp))
1231 /* Add routes to the local end of point-to-point interfaces
1234 if ((ifp->int_if_flags & IFF_POINTOPOINT)
1235 && !(ifp->int_state & IS_REMOTE)
1237 /* Delete any routes to the network address through
1238 * foreign routers. Remove even static routes.
1240 del_static(ifp->int_addr, HOST_MASK, 0, 0);
1241 rt = rtget(ifp->int_addr, HOST_MASK);
1242 if (rt != NULL && rt->rt_router != loopaddr) {
1247 if (!(rt->rt_state & RS_LOCAL)
1248 || rt->rt_metric > ifp->int_metric) {
1253 loop_rts.rts_ifp = ifp1;
1254 loop_rts.rts_metric = 0;
1255 loop_rts.rts_time = rt->rt_time;
1256 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN)
1257 | (RS_IF|RS_LOCAL)),
1260 loop_rts.rts_ifp = ifp;
1261 loop_rts.rts_metric = 0;
1262 rtadd(ifp->int_addr, HOST_MASK,
1263 (RS_IF | RS_LOCAL), &loop_rts);
1268 /* add the authority routes */
1269 for (intnetp = intnets; intnetp!=NULL; intnetp = intnetp->intnet_next) {
1270 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask);
1272 && !(rt->rt_state & RS_NO_NET_SYN)
1273 && !(rt->rt_state & RS_NET_INT)) {
1278 loop_rts.rts_ifp = 0;
1279 loop_rts.rts_metric = intnetp->intnet_metric-1;
1280 rtadd(intnetp->intnet_addr, intnetp->intnet_mask,
1281 RS_NET_SYN | RS_NET_INT, &loop_rts);
1285 prev_complaints = complaints;
1290 check_net_syn(struct interface *ifp)
1292 struct rt_entry *rt;
1293 static struct rt_spare new;
1296 /* Turn on the need to automatically synthesize a network route
1297 * for this interface only if we are running RIPv1 on some other
1298 * interface that is on a different class-A,B,or C network.
1300 if (have_ripv1_out || have_ripv1_in) {
1301 ifp->int_state |= IS_NEED_NET_SYN;
1302 rt = rtget(ifp->int_std_addr, ifp->int_std_mask);
1304 && 0 == (rt->rt_state & RS_NO_NET_SYN)
1305 && (!(rt->rt_state & RS_NET_SYN)
1306 || rt->rt_metric > ifp->int_metric)) {
1312 new.rts_gate = ifp->int_addr;
1313 new.rts_router = ifp->int_addr;
1314 new.rts_metric = ifp->int_metric;
1315 rtadd(ifp->int_std_addr, ifp->int_std_mask,
1320 ifp->int_state &= ~IS_NEED_NET_SYN;
1322 rt = rtget(ifp->int_std_addr,
1325 && (rt->rt_state & RS_NET_SYN)
1326 && rt->rt_ifp == ifp)
1332 /* Add route for interface if not currently installed.
1333 * Create route to other end if a point-to-point link,
1334 * otherwise a route to this (sub)network.
1336 int /* 0=bad interface */
1337 addrouteforif(struct interface *ifp)
1339 struct rt_entry *rt;
1340 static struct rt_spare new;
1344 /* skip sick interfaces
1346 if (ifp->int_state & IS_BROKE)
1349 /* If the interface on a subnet, then install a RIPv1 route to
1350 * the network as well (unless it is sick).
1352 if (ifp->int_state & IS_SUBNET)
1355 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK))
1357 : htonl(ifp->int_net));
1360 new.rts_router = ifp->int_addr;
1361 new.rts_gate = ifp->int_addr;
1362 new.rts_metric = ifp->int_metric;
1363 new.rts_time = now.tv_sec;
1365 /* If we are going to send packets to the gateway,
1366 * it must be reachable using our physical interfaces
1368 if ((ifp->int_state & IS_REMOTE)
1369 && !(ifp->int_state & IS_EXTERNAL)
1370 && !check_remote(ifp))
1373 /* We are finished if the correct main interface route exists.
1374 * The right route must be for the right interface, not synthesized
1375 * from a subnet, be a "gateway" or not as appropriate, and so forth.
1377 del_static(dst, ifp->int_mask, 0, 0);
1378 rt = rtget(dst, ifp->int_mask);
1380 if ((rt->rt_ifp != ifp
1381 || rt->rt_router != ifp->int_addr)
1382 && (!(ifp->int_state & IS_DUP)
1384 || (rt->rt_ifp->int_state & IS_BROKE))) {
1388 rtchange(rt, ((rt->rt_state | RS_IF)
1389 & ~(RS_NET_SYN | RS_LOCAL)),
1394 if (ifp->int_transitions++ > 0)
1395 trace_act("re-install interface %s",
1398 rtadd(dst, ifp->int_mask, RS_IF, &new);