2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (C) 2001 WIDE Project. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * @(#)in.c 8.4 (Berkeley) 1/9/95
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "opt_mpath.h"
38 #include <sys/param.h>
39 #include <sys/eventhandler.h>
40 #include <sys/systm.h>
41 #include <sys/sockio.h>
42 #include <sys/malloc.h>
44 #include <sys/socket.h>
46 #include <sys/kernel.h>
48 #include <sys/sysctl.h>
49 #include <sys/syslog.h>
53 #include <net/if_var.h>
54 #include <net/if_arp.h>
55 #include <net/if_dl.h>
56 #include <net/if_llatbl.h>
57 #include <net/if_types.h>
58 #include <net/route.h>
61 #include <netinet/if_ether.h>
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet/in_pcb.h>
65 #include <netinet/ip_var.h>
66 #include <netinet/ip_carp.h>
67 #include <netinet/igmp_var.h>
68 #include <netinet/udp.h>
69 #include <netinet/udp_var.h>
71 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
72 static int in_difaddr_ioctl(caddr_t, struct ifnet *, struct thread *);
74 static void in_socktrim(struct sockaddr_in *);
75 static void in_purgemaddrs(struct ifnet *);
77 static VNET_DEFINE(int, nosameprefix);
78 #define V_nosameprefix VNET(nosameprefix)
79 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
80 &VNET_NAME(nosameprefix), 0,
81 "Refuse to create same prefixes on different interfaces");
83 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
84 #define V_ripcbinfo VNET(ripcbinfo)
86 static struct sx in_control_sx;
87 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
90 * Return 1 if an internet address is for a ``local'' host
91 * (one to which we have a connection).
94 in_localaddr(struct in_addr in)
96 register u_long i = ntohl(in.s_addr);
97 register struct in_ifaddr *ia;
100 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
101 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
111 * Return 1 if an internet address is for the local host and configured
112 * on one of its interfaces.
115 in_localip(struct in_addr in)
117 struct in_ifaddr *ia;
120 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
121 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
131 * Return a reference to the interface address which is different to
132 * the supplied one but with same IP address value.
134 static struct in_ifaddr *
135 in_localip_more(struct in_ifaddr *ia)
137 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
138 struct in_ifaddr *it;
141 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
142 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
143 ifa_ref(&it->ia_ifa);
154 * Determine whether an IP address is in a reserved set of addresses
155 * that may not be forwarded, or whether datagrams to that destination
159 in_canforward(struct in_addr in)
161 register u_long i = ntohl(in.s_addr);
164 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
167 net = i & IN_CLASSA_NET;
168 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
175 * Trim a mask in a sockaddr
178 in_socktrim(struct sockaddr_in *ap)
180 register char *cplim = (char *) &ap->sin_addr;
181 register char *cp = (char *) (&ap->sin_addr + 1);
184 while (--cp >= cplim)
186 (ap)->sin_len = cp - (char *) (ap) + 1;
192 * Generic internet control operations (ioctl's).
195 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
198 struct ifreq *ifr = (struct ifreq *)data;
199 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
201 struct in_ifaddr *ia;
205 return (EADDRNOTAVAIL);
208 * Filter out 4 ioctls we implement directly. Forward the rest
209 * to specific functions and ifp->if_ioctl().
218 sx_xlock(&in_control_sx);
219 error = in_difaddr_ioctl(data, ifp, td);
220 sx_xunlock(&in_control_sx);
222 case OSIOCAIFADDR: /* 9.x compat */
224 sx_xlock(&in_control_sx);
225 error = in_aifaddr_ioctl(cmd, data, ifp, td);
226 sx_xunlock(&in_control_sx);
232 /* We no longer support that old commands. */
235 if (ifp->if_ioctl == NULL)
237 return ((*ifp->if_ioctl)(ifp, cmd, data));
240 if (addr->sin_addr.s_addr != INADDR_ANY &&
241 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
242 return (EADDRNOTAVAIL);
245 * Find address for this interface, if it exists. If an
246 * address was specified, find that one instead of the
247 * first one on the interface, if possible.
250 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
251 if (ifa->ifa_addr->sa_family != AF_INET)
253 ia = (struct in_ifaddr *)ifa;
254 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
258 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
259 if (ifa->ifa_addr->sa_family == AF_INET) {
260 ia = (struct in_ifaddr *)ifa;
261 if (prison_check_ip4(td->td_ucred,
262 &ia->ia_addr.sin_addr) == 0)
267 IF_ADDR_RUNLOCK(ifp);
268 return (EADDRNOTAVAIL);
278 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
282 *addr = ia->ia_broadaddr;
286 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
290 *addr = ia->ia_dstaddr;
294 *addr = ia->ia_sockmask;
298 IF_ADDR_RUNLOCK(ifp);
304 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
306 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
307 const struct sockaddr_in *addr = &ifra->ifra_addr;
308 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
309 const struct sockaddr_in *mask = &ifra->ifra_mask;
310 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
311 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
313 struct in_ifaddr *ia;
317 error = priv_check(td, PRIV_NET_ADDIFADDR);
322 * ifra_addr must be present and be of INET family.
323 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
325 if (addr->sin_len != sizeof(struct sockaddr_in) ||
326 addr->sin_family != AF_INET)
328 if (broadaddr->sin_len != 0 &&
329 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
330 broadaddr->sin_family != AF_INET))
332 if (mask->sin_len != 0 &&
333 (mask->sin_len != sizeof(struct sockaddr_in) ||
334 mask->sin_family != AF_INET))
336 if ((ifp->if_flags & IFF_POINTOPOINT) &&
337 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
338 dstaddr->sin_addr.s_addr == INADDR_ANY))
339 return (EDESTADDRREQ);
340 if (vhid > 0 && carp_attach_p == NULL)
341 return (EPROTONOSUPPORT);
344 * See whether address already exist.
349 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
350 struct in_ifaddr *it;
352 if (ifa->ifa_addr->sa_family != AF_INET)
355 it = (struct in_ifaddr *)ifa;
357 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
358 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
361 IF_ADDR_RUNLOCK(ifp);
364 (void )in_difaddr_ioctl(data, ifp, td);
366 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
367 ia = (struct in_ifaddr *)ifa;
368 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
369 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
370 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
374 if (mask->sin_len != 0) {
375 ia->ia_sockmask = *mask;
376 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
378 in_addr_t i = ntohl(addr->sin_addr.s_addr);
381 * Be compatible with network classes, if netmask isn't
382 * supplied, guess it based on classes.
385 ia->ia_subnetmask = IN_CLASSA_NET;
386 else if (IN_CLASSB(i))
387 ia->ia_subnetmask = IN_CLASSB_NET;
389 ia->ia_subnetmask = IN_CLASSC_NET;
390 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
392 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
393 in_socktrim(&ia->ia_sockmask);
395 if (ifp->if_flags & IFF_BROADCAST) {
396 if (broadaddr->sin_len != 0) {
397 ia->ia_broadaddr = *broadaddr;
398 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
399 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
400 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
401 ia->ia_broadaddr.sin_family = AF_INET;
403 ia->ia_broadaddr.sin_addr.s_addr =
404 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
405 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
406 ia->ia_broadaddr.sin_family = AF_INET;
410 if (ifp->if_flags & IFF_POINTOPOINT)
411 ia->ia_dstaddr = *dstaddr;
413 /* XXXGL: rtinit() needs this strange assignment. */
414 if (ifp->if_flags & IFF_LOOPBACK)
415 ia->ia_dstaddr = ia->ia_addr;
418 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
423 /* if_addrhead is already referenced by ifa_alloc() */
425 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
426 IF_ADDR_WUNLOCK(ifp);
428 ifa_ref(ifa); /* in_ifaddrhead */
430 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
431 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
435 * Give the interface a chance to initialize
436 * if this is its first address,
437 * and to validate the address if necessary.
439 if (ifp->if_ioctl != NULL) {
440 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
446 * Add route for the network.
451 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
454 error = in_addprefix(ia, flags);
460 * Add a loopback route to self.
462 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
463 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
464 !((ifp->if_flags & IFF_POINTOPOINT) &&
465 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
466 struct in_ifaddr *eia;
468 eia = in_localip_more(ia);
471 error = ifa_add_loopback_route((struct ifaddr *)ia,
472 (struct sockaddr *)&ia->ia_addr);
476 ifa_free(&eia->ia_ifa);
479 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
480 struct in_addr allhosts_addr;
481 struct in_ifinfo *ii;
483 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
484 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
486 error = in_joingroup(ifp, &allhosts_addr, NULL,
490 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
496 (void )in_scrubprefix(ia, LLE_STATIC);
499 if (ia->ia_ifa.ifa_carp)
500 (*carp_detach_p)(&ia->ia_ifa);
503 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
504 IF_ADDR_WUNLOCK(ifp);
505 ifa_free(&ia->ia_ifa); /* if_addrhead */
508 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
509 LIST_REMOVE(ia, ia_hash);
511 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
517 in_difaddr_ioctl(caddr_t data, struct ifnet *ifp, struct thread *td)
519 const struct ifreq *ifr = (struct ifreq *)data;
520 const struct sockaddr_in *addr = (const struct sockaddr_in *)
523 struct in_ifaddr *ia;
524 bool deleteAny, iaIsLast;
528 error = priv_check(td, PRIV_NET_DELIFADDR);
533 if (addr->sin_len != sizeof(struct sockaddr_in) ||
534 addr->sin_family != AF_INET)
542 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
543 struct in_ifaddr *it;
545 if (ifa->ifa_addr->sa_family != AF_INET)
548 it = (struct in_ifaddr *)ifa;
549 if (deleteAny && ia == NULL && (td == NULL ||
550 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
553 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
554 (td == NULL || prison_check_ip4(td->td_ucred,
555 &addr->sin_addr) == 0))
563 IF_ADDR_WUNLOCK(ifp);
564 return (EADDRNOTAVAIL);
567 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
568 IF_ADDR_WUNLOCK(ifp);
569 ifa_free(&ia->ia_ifa); /* if_addrhead */
572 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
573 LIST_REMOVE(ia, ia_hash);
577 * in_scrubprefix() kills the interface route.
579 in_scrubprefix(ia, LLE_STATIC);
582 * in_ifadown gets rid of all the rest of
583 * the routes. This is not quite the right
584 * thing to do, but at least if we are running
585 * a routing process they will come back.
587 in_ifadown(&ia->ia_ifa, 1);
589 if (ia->ia_ifa.ifa_carp)
590 (*carp_detach_p)(&ia->ia_ifa);
593 * If this is the last IPv4 address configured on this
594 * interface, leave the all-hosts group.
595 * No state-change report need be transmitted.
597 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
598 struct in_ifinfo *ii;
600 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
602 if (ii->ii_allhosts) {
603 (void)in_leavegroup_locked(ii->ii_allhosts, NULL);
604 ii->ii_allhosts = NULL;
609 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
610 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
615 #define rtinitflags(x) \
616 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
620 * Check if we have a route for the given prefix already or add one accordingly.
623 in_addprefix(struct in_ifaddr *target, int flags)
625 struct in_ifaddr *ia;
626 struct in_addr prefix, mask, p, m;
629 if ((flags & RTF_HOST) != 0) {
630 prefix = target->ia_dstaddr.sin_addr;
633 prefix = target->ia_addr.sin_addr;
634 mask = target->ia_sockmask.sin_addr;
635 prefix.s_addr &= mask.s_addr;
639 /* Look for an existing address with the same prefix, mask, and fib */
640 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
641 if (rtinitflags(ia)) {
642 p = ia->ia_dstaddr.sin_addr;
644 if (prefix.s_addr != p.s_addr)
647 p = ia->ia_addr.sin_addr;
648 m = ia->ia_sockmask.sin_addr;
649 p.s_addr &= m.s_addr;
651 if (prefix.s_addr != p.s_addr ||
652 mask.s_addr != m.s_addr)
655 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
659 * If we got a matching prefix route inserted by other
660 * interface address, we are done here.
662 if (ia->ia_flags & IFA_ROUTE) {
664 if (ia->ia_addr.sin_addr.s_addr ==
665 target->ia_addr.sin_addr.s_addr) {
671 if (V_nosameprefix) {
677 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
678 target->ia_ifp->if_fib;
679 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
688 * No-one seem to have this prefix route, so we try to insert it.
690 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
692 target->ia_flags |= IFA_ROUTE;
697 * If there is no other address in the system that can serve a route to the
698 * same prefix, remove the route. Hand over the route to the new address
702 in_scrubprefix(struct in_ifaddr *target, u_int flags)
704 struct in_ifaddr *ia;
705 struct in_addr prefix, mask, p, m;
707 struct sockaddr_in prefix0, mask0;
710 * Remove the loopback route to the interface address.
712 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
713 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
714 (flags & LLE_STATIC)) {
715 struct in_ifaddr *eia;
717 eia = in_localip_more(target);
720 int fibnum = target->ia_ifp->if_fib;
722 error = ifa_switch_loopback_route((struct ifaddr *)eia,
723 (struct sockaddr *)&target->ia_addr, fibnum);
724 ifa_free(&eia->ia_ifa);
726 error = ifa_del_loopback_route((struct ifaddr *)target,
727 (struct sockaddr *)&target->ia_addr);
730 if (!(target->ia_ifp->if_flags & IFF_NOARP))
731 /* remove arp cache */
732 arp_ifscrub(target->ia_ifp,
733 IA_SIN(target)->sin_addr.s_addr);
736 if (rtinitflags(target)) {
737 prefix = target->ia_dstaddr.sin_addr;
740 prefix = target->ia_addr.sin_addr;
741 mask = target->ia_sockmask.sin_addr;
742 prefix.s_addr &= mask.s_addr;
745 if ((target->ia_flags & IFA_ROUTE) == 0) {
748 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
749 target->ia_ifp->if_fib;
750 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
755 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
756 if (rtinitflags(ia)) {
757 p = ia->ia_dstaddr.sin_addr;
759 if (prefix.s_addr != p.s_addr)
762 p = ia->ia_addr.sin_addr;
763 m = ia->ia_sockmask.sin_addr;
764 p.s_addr &= m.s_addr;
766 if (prefix.s_addr != p.s_addr ||
767 mask.s_addr != m.s_addr)
771 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
775 * If we got a matching prefix address, move IFA_ROUTE and
776 * the route itself to it. Make sure that routing daemons
779 if ((ia->ia_flags & IFA_ROUTE) == 0) {
780 ifa_ref(&ia->ia_ifa);
782 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
783 rtinitflags(target));
785 target->ia_flags &= ~IFA_ROUTE;
787 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
789 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
790 rtinitflags(ia) | RTF_UP);
792 ia->ia_flags |= IFA_ROUTE;
794 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
796 ifa_free(&ia->ia_ifa);
803 * remove all L2 entries on the given prefix
805 bzero(&prefix0, sizeof(prefix0));
806 prefix0.sin_len = sizeof(prefix0);
807 prefix0.sin_family = AF_INET;
808 prefix0.sin_addr.s_addr = target->ia_subnet;
809 bzero(&mask0, sizeof(mask0));
810 mask0.sin_len = sizeof(mask0);
811 mask0.sin_family = AF_INET;
812 mask0.sin_addr.s_addr = target->ia_subnetmask;
813 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
814 (struct sockaddr *)&mask0, flags);
817 * As no-one seem to have this prefix, we can remove the route.
819 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
821 target->ia_flags &= ~IFA_ROUTE;
823 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
830 * Return 1 if the address might be a local broadcast address.
833 in_broadcast(struct in_addr in, struct ifnet *ifp)
835 register struct ifaddr *ifa;
838 if (in.s_addr == INADDR_BROADCAST ||
839 in.s_addr == INADDR_ANY)
841 if ((ifp->if_flags & IFF_BROADCAST) == 0)
843 t = ntohl(in.s_addr);
845 * Look through the list of addresses for a match
846 * with a broadcast address.
848 #define ia ((struct in_ifaddr *)ifa)
849 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
850 if (ifa->ifa_addr->sa_family == AF_INET &&
851 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
853 * Check for old-style (host 0) broadcast, but
854 * taking into account that RFC 3021 obsoletes it.
856 (ia->ia_subnetmask != IN_RFC3021_MASK &&
857 t == ia->ia_subnet)) &&
859 * Check for an all one subnetmask. These
860 * only exist when an interface gets a secondary
863 ia->ia_subnetmask != (u_long)0xffffffff)
870 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
873 in_ifdetach(struct ifnet *ifp)
876 in_pcbpurgeif0(&V_ripcbinfo, ifp);
877 in_pcbpurgeif0(&V_udbinfo, ifp);
878 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
883 * Delete all IPv4 multicast address records, and associated link-layer
884 * multicast address records, associated with ifp.
885 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
886 * XXX This should not race with ifma_protospec being set during
887 * a new allocation, if it does, we have bigger problems.
890 in_purgemaddrs(struct ifnet *ifp)
892 LIST_HEAD(,in_multi) purgeinms;
893 struct in_multi *inm, *tinm;
894 struct ifmultiaddr *ifma;
896 LIST_INIT(&purgeinms);
900 * Extract list of in_multi associated with the detaching ifp
901 * which the PF_INET layer is about to release.
902 * We need to do this as IF_ADDR_LOCK() may be re-acquired
903 * by code further down.
906 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
907 if (ifma->ifma_addr->sa_family != AF_INET ||
908 ifma->ifma_protospec == NULL)
911 KASSERT(ifma->ifma_protospec != NULL,
912 ("%s: ifma_protospec is NULL", __func__));
914 inm = (struct in_multi *)ifma->ifma_protospec;
915 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
917 IF_ADDR_RUNLOCK(ifp);
919 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
920 LIST_REMOVE(inm, inm_link);
921 inm_release_locked(inm);
930 struct sockaddr_in l3_addr4;
934 * Deletes an address from the address table.
935 * This function is called by the timer functions
936 * such as arptimer() and nd6_llinfo_timer(), and
937 * the caller does the locking.
940 in_lltable_free(struct lltable *llt, struct llentry *lle)
943 LLE_LOCK_DESTROY(lle);
944 free(lle, M_LLTABLE);
947 static struct llentry *
948 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
950 struct in_llentry *lle;
952 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
953 if (lle == NULL) /* NB: caller generates msg */
957 * For IPv4 this will trigger "arpresolve" to generate
960 lle->base.la_expire = time_uptime; /* mark expired */
961 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
962 lle->base.lle_refcnt = 1;
963 lle->base.lle_free = in_lltable_free;
964 LLE_LOCK_INIT(&lle->base);
965 callout_init(&lle->base.la_timer, 1);
970 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
971 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
974 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
975 const struct sockaddr *mask, u_int flags)
977 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
978 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
979 struct llentry *lle, *next;
983 IF_AFDATA_WLOCK(llt->llt_ifp);
984 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
985 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
987 * (flags & LLE_STATIC) means deleting all entries
988 * including static ARP entries.
990 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)),
991 pfx, msk) && ((flags & LLE_STATIC) ||
992 !(lle->la_flags & LLE_STATIC))) {
994 if (callout_stop(&lle->la_timer))
996 pkts_dropped = llentry_free(lle);
997 ARPSTAT_ADD(dropped, pkts_dropped);
1001 IF_AFDATA_WUNLOCK(llt->llt_ifp);
1006 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1010 KASSERT(l3addr->sa_family == AF_INET,
1011 ("sin_family %d", l3addr->sa_family));
1013 /* XXX rtalloc1_fib should take a const param */
1014 rt = rtalloc1_fib(__DECONST(struct sockaddr *, l3addr), 0, 0,
1021 * If the gateway for an existing host route matches the target L3
1022 * address, which is a special route inserted by some implementation
1023 * such as MANET, and the interface is of the correct type, then
1024 * allow for ARP to proceed.
1026 if (rt->rt_flags & RTF_GATEWAY) {
1027 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
1028 rt->rt_ifp->if_type != IFT_ETHER ||
1029 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1030 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
1031 sizeof(in_addr_t)) != 0) {
1038 * Make sure that at least the destination address is covered
1039 * by the route. This is for handling the case where 2 or more
1040 * interfaces have the same prefix. An incoming packet arrives
1041 * on one interface and the corresponding outgoing packet leaves
1042 * another interface.
1044 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
1045 const char *sa, *mask, *addr, *lim;
1048 mask = (const char *)rt_mask(rt);
1050 * Just being extra cautious to avoid some custom
1051 * code getting into trouble.
1058 sa = (const char *)rt_key(rt);
1059 addr = (const char *)l3addr;
1060 len = ((const struct sockaddr_in *)l3addr)->sin_len;
1063 for ( ; addr < lim; sa++, mask++, addr++) {
1064 if ((*sa ^ *addr) & *mask) {
1066 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1067 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1080 * Return NULL if not found or marked for deletion.
1081 * If found return lle read locked.
1083 static struct llentry *
1084 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1086 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1087 struct ifnet *ifp = llt->llt_ifp;
1088 struct llentry *lle;
1089 struct llentries *lleh;
1092 IF_AFDATA_LOCK_ASSERT(ifp);
1093 KASSERT(l3addr->sa_family == AF_INET,
1094 ("sin_family %d", l3addr->sa_family));
1096 hashkey = sin->sin_addr.s_addr;
1097 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
1098 LIST_FOREACH(lle, lleh, lle_next) {
1099 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle));
1100 if (lle->la_flags & LLE_DELETED)
1102 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
1107 if (flags & LLE_DELETE)
1108 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle);
1110 if (!(flags & LLE_CREATE))
1112 IF_AFDATA_WLOCK_ASSERT(ifp);
1114 * A route that covers the given address must have
1115 * been installed 1st because we are doing a resolution,
1118 if (!(flags & LLE_IFADDR) &&
1119 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1122 lle = in_lltable_new(l3addr, flags);
1124 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1127 lle->la_flags = flags & ~LLE_CREATE;
1128 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
1129 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
1130 lle->la_flags |= (LLE_VALID | LLE_STATIC);
1134 lle->lle_head = lleh;
1135 lle->la_flags |= LLE_LINKED;
1136 LIST_INSERT_HEAD(lleh, lle, lle_next);
1137 } else if (flags & LLE_DELETE) {
1138 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
1140 lle->la_flags |= LLE_DELETED;
1141 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1143 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1145 if ((lle->la_flags &
1146 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
1154 if (LLE_IS_VALID(lle)) {
1155 if (flags & LLE_EXCLUSIVE)
1165 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
1167 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle))
1168 struct ifnet *ifp = llt->llt_ifp;
1169 struct llentry *lle;
1172 struct rt_msghdr rtm;
1173 struct sockaddr_in sin;
1174 struct sockaddr_dl sdl;
1178 LLTABLE_LOCK_ASSERT();
1181 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
1182 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
1183 struct sockaddr_dl *sdl;
1185 /* skip deleted entries */
1186 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1188 /* Skip if jailed and not a valid IP of the prison. */
1189 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
1192 * produce a msg made of:
1194 * struct sockaddr_in; (IPv4)
1195 * struct sockaddr_dl;
1197 bzero(&arpc, sizeof(arpc));
1198 arpc.rtm.rtm_msglen = sizeof(arpc);
1199 arpc.rtm.rtm_version = RTM_VERSION;
1200 arpc.rtm.rtm_type = RTM_GET;
1201 arpc.rtm.rtm_flags = RTF_UP;
1202 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1203 arpc.sin.sin_family = AF_INET;
1204 arpc.sin.sin_len = sizeof(arpc.sin);
1205 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
1208 if (lle->la_flags & LLE_PUB)
1209 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1212 sdl->sdl_family = AF_LINK;
1213 sdl->sdl_len = sizeof(*sdl);
1214 sdl->sdl_index = ifp->if_index;
1215 sdl->sdl_type = ifp->if_type;
1216 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1217 sdl->sdl_alen = ifp->if_addrlen;
1218 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1221 bzero(LLADDR(sdl), ifp->if_addrlen);
1224 arpc.rtm.rtm_rmx.rmx_expire =
1225 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1226 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1227 if (lle->la_flags & LLE_STATIC)
1228 arpc.rtm.rtm_flags |= RTF_STATIC;
1229 arpc.rtm.rtm_index = ifp->if_index;
1230 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1240 in_domifattach(struct ifnet *ifp)
1242 struct in_ifinfo *ii;
1243 struct lltable *llt;
1245 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1247 llt = lltable_init(ifp, AF_INET);
1249 llt->llt_prefix_free = in_lltable_prefix_free;
1250 llt->llt_lookup = in_lltable_lookup;
1251 llt->llt_dump = in_lltable_dump;
1255 ii->ii_igmp = igmp_domifattach(ifp);
1261 in_domifdetach(struct ifnet *ifp, void *aux)
1263 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1265 igmp_domifdetach(ifp);
1266 lltable_free(ii->ii_llt);