2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (C) 2001 WIDE Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * @(#)in.c 8.4 (Berkeley) 1/9/95
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #define IN_HISTORICAL_NETS /* include class masks */
42 #include <sys/param.h>
43 #include <sys/eventhandler.h>
44 #include <sys/systm.h>
45 #include <sys/sockio.h>
46 #include <sys/malloc.h>
48 #include <sys/socket.h>
50 #include <sys/kernel.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
58 #include <net/if_var.h>
59 #include <net/if_arp.h>
60 #include <net/if_dl.h>
61 #include <net/if_llatbl.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64 #include <net/route/nhop.h>
65 #include <net/route/route_ctl.h>
68 #include <netinet/if_ether.h>
69 #include <netinet/in.h>
70 #include <netinet/in_fib.h>
71 #include <netinet/in_var.h>
72 #include <netinet/in_pcb.h>
73 #include <netinet/ip_var.h>
74 #include <netinet/ip_carp.h>
75 #include <netinet/igmp_var.h>
76 #include <netinet/udp.h>
77 #include <netinet/udp_var.h>
79 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
80 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
81 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
83 static void in_socktrim(struct sockaddr_in *);
84 static void in_purgemaddrs(struct ifnet *);
86 static bool ia_need_loopback_route(const struct in_ifaddr *);
88 VNET_DEFINE_STATIC(int, nosameprefix);
89 #define V_nosameprefix VNET(nosameprefix)
90 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
91 &VNET_NAME(nosameprefix), 0,
92 "Refuse to create same prefixes on different interfaces");
94 VNET_DEFINE_STATIC(bool, broadcast_lowest);
95 #define V_broadcast_lowest VNET(broadcast_lowest)
96 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
97 &VNET_NAME(broadcast_lowest), 0,
98 "Treat lowest address on a subnet (host 0) as broadcast");
100 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
101 #define V_ripcbinfo VNET(ripcbinfo)
103 static struct sx in_control_sx;
104 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
107 * Return 1 if an internet address is for a ``local'' host
108 * (one to which we have a connection).
111 in_localaddr(struct in_addr in)
113 u_long i = ntohl(in.s_addr);
114 struct in_ifaddr *ia;
118 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
119 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
127 * Return 1 if an internet address is for the local host and configured
128 * on one of its interfaces.
131 in_localip(struct in_addr in)
133 struct in_ifaddr *ia;
137 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
138 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
145 * Like in_localip(), but FIB-aware.
148 in_localip_fib(struct in_addr in, uint16_t fib)
150 struct in_ifaddr *ia;
154 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
155 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
156 ia->ia_ifa.ifa_ifp->if_fib == fib)
163 * Return 1 if an internet address is configured on an interface.
166 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
169 struct in_ifaddr *ia;
173 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
174 if (ifa->ifa_addr->sa_family != AF_INET)
176 ia = (struct in_ifaddr *)ifa;
177 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
185 * Return a reference to the interface address which is different to
186 * the supplied one but with same IP address value.
188 static struct in_ifaddr *
189 in_localip_more(struct in_ifaddr *original_ia)
191 struct epoch_tracker et;
192 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
193 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
194 struct in_ifaddr *ia;
197 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
198 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
199 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
200 if (!V_rt_add_addr_allfibs && (original_fib != fib))
202 if ((original_ia != ia) && (original_addr == addr)) {
203 ifa_ref(&ia->ia_ifa);
214 * Tries to find first IPv4 address in the provided fib.
215 * Prefers non-loopback addresses and return loopback IFF
216 * @loopback_ok is set.
218 * Returns ifa or NULL.
221 in_findlocal(uint32_t fibnum, bool loopback_ok)
223 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
227 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
228 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
229 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
232 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
245 * Determine whether an IP address is in a reserved set of addresses
246 * that may not be forwarded, or whether datagrams to that destination
250 in_canforward(struct in_addr in)
252 u_long i = ntohl(in.s_addr);
254 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
255 IN_ZERONET(i) || IN_LOOPBACK(i))
261 * Trim a mask in a sockaddr
264 in_socktrim(struct sockaddr_in *ap)
266 char *cplim = (char *) &ap->sin_addr;
267 char *cp = (char *) (&ap->sin_addr + 1);
270 while (--cp >= cplim)
272 (ap)->sin_len = cp - (char *) (ap) + 1;
278 * Generic internet control operations (ioctl's).
281 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
284 struct ifreq *ifr = (struct ifreq *)data;
285 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
286 struct epoch_tracker et;
288 struct in_ifaddr *ia;
292 return (EADDRNOTAVAIL);
295 * Filter out 4 ioctls we implement directly. Forward the rest
296 * to specific functions and ifp->if_ioctl().
305 sx_xlock(&in_control_sx);
306 error = in_gifaddr_ioctl(cmd, data, ifp, td);
307 sx_xunlock(&in_control_sx);
310 sx_xlock(&in_control_sx);
311 error = in_difaddr_ioctl(cmd, data, ifp, td);
312 sx_xunlock(&in_control_sx);
314 case OSIOCAIFADDR: /* 9.x compat */
316 sx_xlock(&in_control_sx);
317 error = in_aifaddr_ioctl(cmd, data, ifp, td);
318 sx_xunlock(&in_control_sx);
324 /* We no longer support that old commands. */
327 if (ifp->if_ioctl == NULL)
329 return ((*ifp->if_ioctl)(ifp, cmd, data));
332 if (addr->sin_addr.s_addr != INADDR_ANY &&
333 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
334 return (EADDRNOTAVAIL);
337 * Find address for this interface, if it exists. If an
338 * address was specified, find that one instead of the
339 * first one on the interface, if possible.
342 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
343 if (ifa->ifa_addr->sa_family != AF_INET)
345 ia = (struct in_ifaddr *)ifa;
346 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
350 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
351 if (ifa->ifa_addr->sa_family == AF_INET) {
352 ia = (struct in_ifaddr *)ifa;
353 if (prison_check_ip4(td->td_ucred,
354 &ia->ia_addr.sin_addr) == 0)
360 return (EADDRNOTAVAIL);
370 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
374 *addr = ia->ia_broadaddr;
378 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
382 *addr = ia->ia_dstaddr;
386 *addr = ia->ia_sockmask;
396 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
398 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
399 const struct sockaddr_in *addr = &ifra->ifra_addr;
400 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
401 const struct sockaddr_in *mask = &ifra->ifra_mask;
402 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
403 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
404 struct epoch_tracker et;
406 struct in_ifaddr *ia;
410 error = priv_check(td, PRIV_NET_ADDIFADDR);
415 * ifra_addr must be present and be of INET family.
416 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
418 if (addr->sin_len != sizeof(struct sockaddr_in) ||
419 addr->sin_family != AF_INET)
421 if (broadaddr->sin_len != 0 &&
422 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
423 broadaddr->sin_family != AF_INET))
425 if (mask->sin_len != 0 &&
426 (mask->sin_len != sizeof(struct sockaddr_in) ||
427 mask->sin_family != AF_INET))
429 if ((ifp->if_flags & IFF_POINTOPOINT) &&
430 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
431 dstaddr->sin_addr.s_addr == INADDR_ANY))
432 return (EDESTADDRREQ);
433 if (vhid != 0 && carp_attach_p == NULL)
434 return (EPROTONOSUPPORT);
437 * See whether address already exist.
442 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
443 struct in_ifaddr *it;
445 if (ifa->ifa_addr->sa_family != AF_INET)
448 it = (struct in_ifaddr *)ifa;
449 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
450 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
458 (void )in_difaddr_ioctl(cmd, data, ifp, td);
460 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
461 ia = (struct in_ifaddr *)ifa;
462 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
463 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
464 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
465 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
466 CALLOUT_RETURNUNLOCKED);
470 if (mask->sin_len != 0) {
471 ia->ia_sockmask = *mask;
472 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
474 in_addr_t i = ntohl(addr->sin_addr.s_addr);
477 * If netmask isn't supplied, use historical default.
478 * This is deprecated for interfaces other than loopback
479 * or point-to-point; warn in other cases. In the future
480 * we should return an error rather than warning.
482 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
483 printf("%s: set address: WARNING: network mask "
484 "should be specified; using historical default\n",
487 ia->ia_subnetmask = IN_CLASSA_NET;
488 else if (IN_CLASSB(i))
489 ia->ia_subnetmask = IN_CLASSB_NET;
491 ia->ia_subnetmask = IN_CLASSC_NET;
492 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
494 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
495 in_socktrim(&ia->ia_sockmask);
497 if (ifp->if_flags & IFF_BROADCAST) {
498 if (broadaddr->sin_len != 0) {
499 ia->ia_broadaddr = *broadaddr;
500 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
501 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
502 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
503 ia->ia_broadaddr.sin_family = AF_INET;
505 ia->ia_broadaddr.sin_addr.s_addr =
506 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
507 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
508 ia->ia_broadaddr.sin_family = AF_INET;
512 if (ifp->if_flags & IFF_POINTOPOINT)
513 ia->ia_dstaddr = *dstaddr;
516 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
521 /* if_addrhead is already referenced by ifa_alloc() */
523 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
524 IF_ADDR_WUNLOCK(ifp);
526 ifa_ref(ifa); /* in_ifaddrhead */
527 sx_assert(&in_control_sx, SA_XLOCKED);
528 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
529 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
533 * Give the interface a chance to initialize
534 * if this is its first address,
535 * and to validate the address if necessary.
537 if (ifp->if_ioctl != NULL) {
538 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
544 * Add route for the network.
547 error = in_addprefix(ia);
553 * Add a loopback route to self.
555 if (vhid == 0 && ia_need_loopback_route(ia)) {
556 struct in_ifaddr *eia;
558 eia = in_localip_more(ia);
561 error = ifa_add_loopback_route((struct ifaddr *)ia,
562 (struct sockaddr *)&ia->ia_addr);
566 ifa_free(&eia->ia_ifa);
569 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
570 struct in_addr allhosts_addr;
571 struct in_ifinfo *ii;
573 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
574 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
576 error = in_joingroup(ifp, &allhosts_addr, NULL,
581 * Note: we don't need extra reference for ifa, since we called
582 * with sx lock held, and ifaddr can not be deleted in concurrent
585 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
591 (void )in_scrubprefix(ia, LLE_STATIC);
594 if (ia->ia_ifa.ifa_carp)
595 (*carp_detach_p)(&ia->ia_ifa, false);
598 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
599 IF_ADDR_WUNLOCK(ifp);
600 ifa_free(&ia->ia_ifa); /* if_addrhead */
602 sx_assert(&in_control_sx, SA_XLOCKED);
603 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
604 CK_LIST_REMOVE(ia, ia_hash);
605 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
611 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
613 const struct ifreq *ifr = (struct ifreq *)data;
614 const struct sockaddr_in *addr = (const struct sockaddr_in *)
617 struct in_ifaddr *ia;
618 bool deleteAny, iaIsLast;
622 error = priv_check(td, PRIV_NET_DELIFADDR);
627 if (addr->sin_len != sizeof(struct sockaddr_in) ||
628 addr->sin_family != AF_INET)
636 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
637 struct in_ifaddr *it;
639 if (ifa->ifa_addr->sa_family != AF_INET)
642 it = (struct in_ifaddr *)ifa;
643 if (deleteAny && ia == NULL && (td == NULL ||
644 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
647 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
648 (td == NULL || prison_check_ip4(td->td_ucred,
649 &addr->sin_addr) == 0))
657 IF_ADDR_WUNLOCK(ifp);
658 return (EADDRNOTAVAIL);
661 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
662 IF_ADDR_WUNLOCK(ifp);
663 ifa_free(&ia->ia_ifa); /* if_addrhead */
665 sx_assert(&in_control_sx, SA_XLOCKED);
666 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
667 CK_LIST_REMOVE(ia, ia_hash);
670 * in_scrubprefix() kills the interface route.
672 in_scrubprefix(ia, LLE_STATIC);
675 * in_ifadown gets rid of all the rest of
676 * the routes. This is not quite the right
677 * thing to do, but at least if we are running
678 * a routing process they will come back.
680 in_ifadown(&ia->ia_ifa, 1);
682 if (ia->ia_ifa.ifa_carp)
683 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
686 * If this is the last IPv4 address configured on this
687 * interface, leave the all-hosts group.
688 * No state-change report need be transmitted.
690 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
691 struct in_ifinfo *ii;
693 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
694 if (ii->ii_allhosts) {
695 (void)in_leavegroup(ii->ii_allhosts, NULL);
696 ii->ii_allhosts = NULL;
701 if (callout_stop(&ia->ia_garp_timer) == 1) {
702 ifa_free(&ia->ia_ifa);
704 IF_ADDR_WUNLOCK(ifp);
706 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
708 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
714 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
716 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
717 const struct sockaddr_in *addr = &ifra->ifra_addr;
718 struct epoch_tracker et;
720 struct in_ifaddr *ia;
723 * ifra_addr must be present and be of INET family.
725 if (addr->sin_len != sizeof(struct sockaddr_in) ||
726 addr->sin_family != AF_INET)
730 * See whether address exist.
734 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
735 struct in_ifaddr *it;
737 if (ifa->ifa_addr->sa_family != AF_INET)
740 it = (struct in_ifaddr *)ifa;
741 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
742 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
749 return (EADDRNOTAVAIL);
752 ifra->ifra_mask = ia->ia_sockmask;
753 if ((ifp->if_flags & IFF_POINTOPOINT) &&
754 ia->ia_dstaddr.sin_family == AF_INET)
755 ifra->ifra_dstaddr = ia->ia_dstaddr;
756 else if ((ifp->if_flags & IFF_BROADCAST) &&
757 ia->ia_broadaddr.sin_family == AF_INET)
758 ifra->ifra_broadaddr = ia->ia_broadaddr;
760 memset(&ifra->ifra_broadaddr, 0,
761 sizeof(ifra->ifra_broadaddr));
768 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
771 if (nh->nh_ifa == (struct ifaddr *)arg)
778 in_handle_prefix_route(uint32_t fibnum, int cmd,
779 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
785 /* Prepare gateway */
786 struct sockaddr_dl_short sdl = {
787 .sdl_family = AF_LINK,
788 .sdl_len = sizeof(struct sockaddr_dl_short),
789 .sdl_type = ifa->ifa_ifp->if_type,
790 .sdl_index = ifa->ifa_ifp->if_index,
793 struct rt_addrinfo info = {
796 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
798 [RTAX_DST] = (struct sockaddr *)dst,
799 [RTAX_NETMASK] = (struct sockaddr *)netmask,
800 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
802 /* Ensure we delete the prefix IFF prefix ifa matches */
803 .rti_filter = in_match_ifaddr,
804 .rti_filterdata = ifa,
807 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
811 * Routing table interaction with interface addresses.
813 * In general, two types of routes needs to be installed:
814 * a) "interface" or "prefix" route, telling user that the addresses
815 * behind the ifa prefix are reached directly.
816 * b) "loopback" route installed for the ifa address, telling user that
817 * the address belongs to local system.
819 * Handling for (a) and (b) differs in multi-fib aspects, hence they
820 * are implemented in different functions below.
822 * The cases above may intersect - /32 interface aliases results in
823 * the same prefix produced by (a) and (b). This blurs the definition
824 * of the "loopback" route and complicate interactions. The interaction
825 * table is defined below. The case numbers are used in the multiple
826 * functions below to refer to the particular test case.
828 * There can be multiple options:
829 * 1) Adding address with prefix on non-p2p/non-loopback interface.
830 * Example: 192.0.2.1/24. Action:
831 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
832 * using @ia as an address source.
833 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
834 * @ia ifp in the gateway and using @ia as an address source.
836 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
837 * Example: 192.0.2.2/32. Action:
838 * * add "prefix" host route via V_loif, using @ia as an address source.
840 * 3) Adding address with or without prefix to p2p interface.
841 * Example: 10.0.0.1/24->10.0.0.2. Action:
842 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
843 * as an address source. Note: no sense in installing full /24 as the interface
845 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
846 * @ia ifp in the gateway and using @ia as an address source.
848 * 4) Adding address with or without prefix to loopback interface.
849 * Example: 192.0.2.1/24. Action:
850 * * add "prefix" host route via @ia interface, using @ia as an address source.
851 * Note: Skip installing /24 prefix as it would introduce TTL loop
852 * for the traffic destined to these addresses.
856 * Checks if @ia needs to install loopback route to @ia address via
857 * ifa_maintain_loopback_route().
859 * Return true on success.
862 ia_need_loopback_route(const struct in_ifaddr *ia)
864 struct ifnet *ifp = ia->ia_ifp;
866 /* Case 4: Skip loopback interfaces */
867 if ((ifp->if_flags & IFF_LOOPBACK) ||
868 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
871 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
872 if ((ifp->if_flags & IFF_POINTOPOINT) &&
873 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
876 /* Case 2: skip /32 prefixes */
877 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
878 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
885 * Calculate "prefix" route corresponding to @ia.
888 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
891 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
892 /* Case 3: return host route for dstaddr */
893 *prefix = ia->ia_dstaddr.sin_addr;
894 mask->s_addr = INADDR_BROADCAST;
895 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
896 /* Case 4: return host route for ifaddr */
897 *prefix = ia->ia_addr.sin_addr;
898 mask->s_addr = INADDR_BROADCAST;
900 /* Cases 1,2: return actual ia prefix */
901 *prefix = ia->ia_addr.sin_addr;
902 *mask = ia->ia_sockmask.sin_addr;
903 prefix->s_addr &= mask->s_addr;
908 * Adds or delete interface "prefix" route corresponding to @ifa.
909 * Returns 0 on success or errno.
912 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
914 struct ifaddr *ifa = &ia->ia_ifa;
915 struct in_addr daddr, maddr;
916 struct sockaddr_in *pmask;
917 struct epoch_tracker et;
920 ia_getrtprefix(ia, &daddr, &maddr);
922 struct sockaddr_in mask = {
923 .sin_family = AF_INET,
924 .sin_len = sizeof(struct sockaddr_in),
928 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
930 struct sockaddr_in dst = {
931 .sin_family = AF_INET,
932 .sin_len = sizeof(struct sockaddr_in),
933 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
936 struct ifnet *ifp = ia->ia_ifp;
938 if ((maddr.s_addr == INADDR_BROADCAST) &&
939 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
940 /* Case 2: host route on broadcast interface */
944 uint32_t fibnum = ifa->ifa_ifp->if_fib;
946 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
953 * Check if we have a route for the given prefix already.
956 in_hasrtprefix(struct in_ifaddr *target)
958 struct epoch_tracker et;
959 struct in_ifaddr *ia;
960 struct in_addr prefix, mask, p, m;
963 ia_getrtprefix(target, &prefix, &mask);
965 /* Look for an existing address with the same prefix, mask, and fib */
967 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
968 ia_getrtprefix(ia, &p, &m);
970 if (prefix.s_addr != p.s_addr ||
971 mask.s_addr != m.s_addr)
974 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
978 * If we got a matching prefix route inserted by other
979 * interface address, we are done here.
981 if (ia->ia_flags & IFA_ROUTE) {
992 in_addprefix(struct in_ifaddr *target)
996 if (in_hasrtprefix(target)) {
1000 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1001 target->ia_ifp->if_fib);
1007 * No-one seem to have this prefix route, so we try to insert it.
1009 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1010 error = in_handle_ifaddr_route(RTM_ADD, target);
1012 target->ia_flags |= IFA_ROUTE;
1017 * Removes either all lle entries for given @ia, or lle
1018 * corresponding to @ia address.
1021 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1023 struct sockaddr_in addr, mask;
1024 struct sockaddr *saddr, *smask;
1027 saddr = (struct sockaddr *)&addr;
1028 bzero(&addr, sizeof(addr));
1029 addr.sin_len = sizeof(addr);
1030 addr.sin_family = AF_INET;
1031 smask = (struct sockaddr *)&mask;
1032 bzero(&mask, sizeof(mask));
1033 mask.sin_len = sizeof(mask);
1034 mask.sin_family = AF_INET;
1035 mask.sin_addr.s_addr = ia->ia_subnetmask;
1040 * Remove all L2 entries matching given prefix.
1041 * Convert address to host representation to avoid
1042 * doing this on every callback. ia_subnetmask is already
1043 * stored in host representation.
1045 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1046 lltable_prefix_free(AF_INET, saddr, smask, flags);
1048 /* Remove interface address only */
1049 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1050 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1055 * If there is no other address in the system that can serve a route to the
1056 * same prefix, remove the route. Hand over the route to the new address
1060 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1062 struct epoch_tracker et;
1063 struct in_ifaddr *ia;
1064 struct in_addr prefix, mask, p, m;
1068 * Remove the loopback route to the interface address.
1070 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1071 struct in_ifaddr *eia;
1073 eia = in_localip_more(target);
1076 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1077 (struct sockaddr *)&target->ia_addr);
1078 ifa_free(&eia->ia_ifa);
1080 error = ifa_del_loopback_route((struct ifaddr *)target,
1081 (struct sockaddr *)&target->ia_addr);
1085 ia_getrtprefix(target, &prefix, &mask);
1087 if ((target->ia_flags & IFA_ROUTE) == 0) {
1088 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1091 * Removing address from !IFF_UP interface or
1092 * prefix which exists on other interface (along with route).
1093 * No entries should exist here except target addr.
1094 * Given that, delete this entry only.
1096 in_scrubprefixlle(target, 0, flags);
1100 NET_EPOCH_ENTER(et);
1101 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1102 ia_getrtprefix(ia, &p, &m);
1104 if (prefix.s_addr != p.s_addr ||
1105 mask.s_addr != m.s_addr)
1108 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1112 * If we got a matching prefix address, move IFA_ROUTE and
1113 * the route itself to it. Make sure that routing daemons
1116 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1117 ifa_ref(&ia->ia_ifa);
1119 error = in_handle_ifaddr_route(RTM_DELETE, target);
1121 target->ia_flags &= ~IFA_ROUTE;
1123 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1125 /* Scrub all entries IFF interface is different */
1126 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1128 error = in_handle_ifaddr_route(RTM_ADD, ia);
1130 ia->ia_flags |= IFA_ROUTE;
1132 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1134 ifa_free(&ia->ia_ifa);
1141 * remove all L2 entries on the given prefix
1143 in_scrubprefixlle(target, 1, flags);
1146 * As no-one seem to have this prefix, we can remove the route.
1148 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1149 error = in_handle_ifaddr_route(RTM_DELETE, target);
1151 target->ia_flags &= ~IFA_ROUTE;
1153 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1158 in_ifscrub_all(void)
1161 struct ifaddr *ifa, *nifa;
1162 struct ifaliasreq ifr;
1165 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1166 /* Cannot lock here - lock recursion. */
1167 /* NET_EPOCH_ENTER(et); */
1168 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1169 if (ifa->ifa_addr->sa_family != AF_INET)
1173 * This is ugly but the only way for legacy IP to
1174 * cleanly remove addresses and everything attached.
1176 bzero(&ifr, sizeof(ifr));
1177 ifr.ifra_addr = *ifa->ifa_addr;
1178 if (ifa->ifa_dstaddr)
1179 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
1180 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1183 /* NET_EPOCH_EXIT(et); */
1184 in_purgemaddrs(ifp);
1185 igmp_domifdetach(ifp);
1191 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1194 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1196 * Optionally check for old-style (host 0) broadcast, but
1197 * taking into account that RFC 3021 obsoletes it.
1199 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1200 ntohl(in.s_addr) == ia->ia_subnet)) &&
1202 * Check for an all one subnetmask. These
1203 * only exist when an interface gets a secondary
1206 ia->ia_subnetmask != (u_long)0xffffffff);
1210 * Return 1 if the address might be a local broadcast address.
1213 in_broadcast(struct in_addr in, struct ifnet *ifp)
1220 if (in.s_addr == INADDR_BROADCAST ||
1221 in.s_addr == INADDR_ANY)
1223 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1227 * Look through the list of addresses for a match
1228 * with a broadcast address.
1230 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1231 if (ifa->ifa_addr->sa_family == AF_INET &&
1232 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1240 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1243 in_ifdetach(struct ifnet *ifp)
1246 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1247 in_pcbpurgeif0(&V_udbinfo, ifp);
1248 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1249 in_purgemaddrs(ifp);
1253 * Make sure all multicast deletions invoking if_ioctl() are
1254 * completed before returning. Else we risk accessing a freed
1255 * ifnet structure pointer.
1257 inm_release_wait(NULL);
1261 * Delete all IPv4 multicast address records, and associated link-layer
1262 * multicast address records, associated with ifp.
1263 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1264 * XXX This should not race with ifma_protospec being set during
1265 * a new allocation, if it does, we have bigger problems.
1268 in_purgemaddrs(struct ifnet *ifp)
1270 struct in_multi_head purgeinms;
1271 struct in_multi *inm;
1272 struct ifmultiaddr *ifma, *next;
1274 SLIST_INIT(&purgeinms);
1275 IN_MULTI_LIST_LOCK();
1278 * Extract list of in_multi associated with the detaching ifp
1279 * which the PF_INET layer is about to release.
1280 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1281 * by code further down.
1285 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1286 if (ifma->ifma_addr->sa_family != AF_INET ||
1287 ifma->ifma_protospec == NULL)
1289 inm = (struct in_multi *)ifma->ifma_protospec;
1290 inm_rele_locked(&purgeinms, inm);
1291 if (__predict_false(ifma_restart)) {
1292 ifma_restart = true;
1296 IF_ADDR_WUNLOCK(ifp);
1298 inm_release_list_deferred(&purgeinms);
1300 IN_MULTI_LIST_UNLOCK();
1304 struct llentry base;
1307 #define IN_LLTBL_DEFAULT_HSIZE 32
1308 #define IN_LLTBL_HASH(k, h) \
1309 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1312 * Do actual deallocation of @lle.
1315 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1317 struct llentry *lle;
1319 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1320 LLE_LOCK_DESTROY(lle);
1321 LLE_REQ_DESTROY(lle);
1322 free(lle, M_LLTABLE);
1326 * Called by LLE_FREE_LOCKED when number of references
1330 in_lltable_destroy_lle(struct llentry *lle)
1334 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1337 static struct llentry *
1338 in_lltable_new(struct in_addr addr4, u_int flags)
1340 struct in_llentry *lle;
1342 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1343 if (lle == NULL) /* NB: caller generates msg */
1347 * For IPv4 this will trigger "arpresolve" to generate
1350 lle->base.la_expire = time_uptime; /* mark expired */
1351 lle->base.r_l3addr.addr4 = addr4;
1352 lle->base.lle_refcnt = 1;
1353 lle->base.lle_free = in_lltable_destroy_lle;
1354 LLE_LOCK_INIT(&lle->base);
1355 LLE_REQ_INIT(&lle->base);
1356 callout_init(&lle->base.lle_timer, 1);
1358 return (&lle->base);
1361 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1362 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1365 in_lltable_match_prefix(const struct sockaddr *saddr,
1366 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1368 struct in_addr addr, mask, lle_addr;
1370 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1371 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1372 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1374 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1377 if (lle->la_flags & LLE_IFADDR) {
1379 * Delete LLE_IFADDR records IFF address & flag matches.
1380 * Note that addr is the interface address within prefix
1382 * Note also we should handle 'ifdown' cases without removing
1385 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1390 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1391 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1398 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1400 size_t pkts_dropped;
1402 LLE_WLOCK_ASSERT(lle);
1403 KASSERT(llt != NULL, ("lltable is NULL"));
1405 /* Unlink entry from table if not already */
1406 if ((lle->la_flags & LLE_LINKED) != 0) {
1407 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1408 lltable_unlink_entry(llt, lle);
1411 /* Drop hold queue */
1412 pkts_dropped = llentry_free(lle);
1413 ARPSTAT_ADD(dropped, pkts_dropped);
1417 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1419 struct nhop_object *nh;
1420 struct in_addr addr;
1422 KASSERT(l3addr->sa_family == AF_INET,
1423 ("sin_family %d", l3addr->sa_family));
1425 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1427 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1432 * If the gateway for an existing host route matches the target L3
1433 * address, which is a special route inserted by some implementation
1434 * such as MANET, and the interface is of the correct type, then
1435 * allow for ARP to proceed.
1437 if (nh->nh_flags & NHF_GATEWAY) {
1438 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1439 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1440 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1441 sizeof(in_addr_t)) != 0) {
1447 * Make sure that at least the destination address is covered
1448 * by the route. This is for handling the case where 2 or more
1449 * interfaces have the same prefix. An incoming packet arrives
1450 * on one interface and the corresponding outgoing packet leaves
1451 * another interface.
1453 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1454 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1455 struct in_addr dst_addr, mask_addr;
1461 * ifaof_ifpforaddr() returns _best matching_ IFA.
1462 * It is possible that ifa prefix does not cover our address.
1463 * Explicitly verify and fail if that's the case.
1465 dst_addr = IA_SIN(ia)->sin_addr;
1466 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1468 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1475 static inline uint32_t
1476 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1479 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1483 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1486 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1490 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1492 struct sockaddr_in *sin;
1494 sin = (struct sockaddr_in *)sa;
1495 bzero(sin, sizeof(*sin));
1496 sin->sin_family = AF_INET;
1497 sin->sin_len = sizeof(*sin);
1498 sin->sin_addr = lle->r_l3addr.addr4;
1501 static inline struct llentry *
1502 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1504 struct llentry *lle;
1505 struct llentries *lleh;
1508 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1509 lleh = &llt->lle_head[hashidx];
1510 CK_LIST_FOREACH(lle, lleh, lle_next) {
1511 if (lle->la_flags & LLE_DELETED)
1513 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1521 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1524 lle->la_flags |= LLE_DELETED;
1525 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1527 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1532 static struct llentry *
1533 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1535 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1536 struct ifnet *ifp = llt->llt_ifp;
1537 struct llentry *lle;
1538 char linkhdr[LLE_MAX_LINKHDR];
1542 KASSERT(l3addr->sa_family == AF_INET,
1543 ("sin_family %d", l3addr->sa_family));
1546 * A route that covers the given address must have
1547 * been installed 1st because we are doing a resolution,
1550 if (!(flags & LLE_IFADDR) &&
1551 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1554 lle = in_lltable_new(sin->sin_addr, flags);
1556 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1559 lle->la_flags = flags;
1560 if (flags & LLE_STATIC)
1561 lle->r_flags |= RLLE_VALID;
1562 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1563 linkhdrsize = LLE_MAX_LINKHDR;
1564 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1565 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1566 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1569 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1571 lle->la_flags |= LLE_STATIC;
1572 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1579 * Return NULL if not found or marked for deletion.
1580 * If found return lle read locked.
1582 static struct llentry *
1583 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1585 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1586 struct llentry *lle;
1588 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1589 KASSERT(l3addr->sa_family == AF_INET,
1590 ("sin_family %d", l3addr->sa_family));
1591 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1592 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1593 ("wrong lle request flags: %#x", flags));
1595 lle = in_lltable_find_dst(llt, sin->sin_addr);
1598 if (flags & LLE_UNLOCKED)
1601 if (flags & LLE_EXCLUSIVE)
1607 * If the afdata lock is not held, the LLE may have been unlinked while
1608 * we were blocked on the LLE lock. Check for this case.
1610 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1611 if (flags & LLE_EXCLUSIVE)
1621 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1622 struct sysctl_req *wr)
1624 struct ifnet *ifp = llt->llt_ifp;
1627 struct rt_msghdr rtm;
1628 struct sockaddr_in sin;
1629 struct sockaddr_dl sdl;
1631 struct sockaddr_dl *sdl;
1634 bzero(&arpc, sizeof(arpc));
1635 /* skip deleted entries */
1636 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1638 /* Skip if jailed and not a valid IP of the prison. */
1639 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1640 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1643 * produce a msg made of:
1645 * struct sockaddr_in; (IPv4)
1646 * struct sockaddr_dl;
1648 arpc.rtm.rtm_msglen = sizeof(arpc);
1649 arpc.rtm.rtm_version = RTM_VERSION;
1650 arpc.rtm.rtm_type = RTM_GET;
1651 arpc.rtm.rtm_flags = RTF_UP;
1652 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1655 if (lle->la_flags & LLE_PUB)
1656 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1659 sdl->sdl_family = AF_LINK;
1660 sdl->sdl_len = sizeof(*sdl);
1661 sdl->sdl_index = ifp->if_index;
1662 sdl->sdl_type = ifp->if_type;
1663 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1664 sdl->sdl_alen = ifp->if_addrlen;
1665 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1668 bzero(LLADDR(sdl), ifp->if_addrlen);
1671 arpc.rtm.rtm_rmx.rmx_expire =
1672 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1673 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1674 if (lle->la_flags & LLE_STATIC)
1675 arpc.rtm.rtm_flags |= RTF_STATIC;
1676 if (lle->la_flags & LLE_IFADDR)
1677 arpc.rtm.rtm_flags |= RTF_PINNED;
1678 arpc.rtm.rtm_index = ifp->if_index;
1679 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1684 static struct lltable *
1685 in_lltattach(struct ifnet *ifp)
1687 struct lltable *llt;
1689 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1690 llt->llt_af = AF_INET;
1693 llt->llt_lookup = in_lltable_lookup;
1694 llt->llt_alloc_entry = in_lltable_alloc;
1695 llt->llt_delete_entry = in_lltable_delete_entry;
1696 llt->llt_dump_entry = in_lltable_dump_entry;
1697 llt->llt_hash = in_lltable_hash;
1698 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1699 llt->llt_free_entry = in_lltable_free_entry;
1700 llt->llt_match_prefix = in_lltable_match_prefix;
1701 llt->llt_mark_used = llentry_mark_used;
1708 in_lltable_get(struct ifnet *ifp)
1710 struct lltable *llt = NULL;
1712 void *afdata_ptr = ifp->if_afdata[AF_INET];
1713 if (afdata_ptr != NULL)
1714 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1719 in_domifattach(struct ifnet *ifp)
1721 struct in_ifinfo *ii;
1723 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1725 ii->ii_llt = in_lltattach(ifp);
1726 ii->ii_igmp = igmp_domifattach(ifp);
1732 in_domifdetach(struct ifnet *ifp, void *aux)
1734 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1736 igmp_domifdetach(ifp);
1737 lltable_free(ii->ii_llt);