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("$FreeBSD$");
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>
49 #include <sys/rmlock.h>
50 #include <sys/sysctl.h>
51 #include <sys/syslog.h>
55 #include <net/if_var.h>
56 #include <net/if_arp.h>
57 #include <net/if_dl.h>
58 #include <net/if_llatbl.h>
59 #include <net/if_types.h>
60 #include <net/route.h>
61 #include <net/route/nhop.h>
62 #include <net/route/route_ctl.h>
65 #include <netinet/if_ether.h>
66 #include <netinet/in.h>
67 #include <netinet/in_fib.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_pcb.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/ip_carp.h>
72 #include <netinet/igmp_var.h>
73 #include <netinet/udp.h>
74 #include <netinet/udp_var.h>
76 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
77 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
78 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
80 static void in_socktrim(struct sockaddr_in *);
81 static void in_purgemaddrs(struct ifnet *);
83 static bool ia_need_loopback_route(const struct in_ifaddr *);
85 VNET_DEFINE_STATIC(int, nosameprefix);
86 #define V_nosameprefix VNET(nosameprefix)
87 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
88 &VNET_NAME(nosameprefix), 0,
89 "Refuse to create same prefixes on different interfaces");
91 VNET_DEFINE_STATIC(bool, broadcast_lowest);
92 #define V_broadcast_lowest VNET(broadcast_lowest)
93 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
94 &VNET_NAME(broadcast_lowest), 0,
95 "Treat lowest address on a subnet (host 0) as broadcast");
97 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
98 #define V_ripcbinfo VNET(ripcbinfo)
100 static struct sx in_control_sx;
101 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
104 * Return 1 if an internet address is for a ``local'' host
105 * (one to which we have a connection).
108 in_localaddr(struct in_addr in)
110 u_long i = ntohl(in.s_addr);
111 struct in_ifaddr *ia;
115 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
116 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
124 * Return 1 if an internet address is for the local host and configured
125 * on one of its interfaces.
128 in_localip(struct in_addr in)
130 struct rm_priotracker in_ifa_tracker;
131 struct in_ifaddr *ia;
133 IN_IFADDR_RLOCK(&in_ifa_tracker);
134 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
135 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
136 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
140 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
145 * Return 1 if an internet address is configured on an interface.
148 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
151 struct in_ifaddr *ia;
155 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
156 if (ifa->ifa_addr->sa_family != AF_INET)
158 ia = (struct in_ifaddr *)ifa;
159 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
167 * Return a reference to the interface address which is different to
168 * the supplied one but with same IP address value.
170 static struct in_ifaddr *
171 in_localip_more(struct in_ifaddr *original_ia)
173 struct rm_priotracker in_ifa_tracker;
174 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
175 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
176 struct in_ifaddr *ia;
178 IN_IFADDR_RLOCK(&in_ifa_tracker);
179 LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
180 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
181 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
182 if (!V_rt_add_addr_allfibs && (original_fib != fib))
184 if ((original_ia != ia) && (original_addr == addr)) {
185 ifa_ref(&ia->ia_ifa);
186 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
190 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
196 * Tries to find first IPv4 address in the provided fib.
197 * Prefers non-loopback addresses and return loopback IFF
198 * @loopback_ok is set.
200 * Returns ifa or NULL.
203 in_findlocal(uint32_t fibnum, bool loopback_ok)
205 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
209 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
210 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
211 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
214 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
227 * Determine whether an IP address is in a reserved set of addresses
228 * that may not be forwarded, or whether datagrams to that destination
232 in_canforward(struct in_addr in)
234 u_long i = ntohl(in.s_addr);
236 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
237 IN_ZERONET(i) || IN_LOOPBACK(i))
243 * Trim a mask in a sockaddr
246 in_socktrim(struct sockaddr_in *ap)
248 char *cplim = (char *) &ap->sin_addr;
249 char *cp = (char *) (&ap->sin_addr + 1);
252 while (--cp >= cplim)
254 (ap)->sin_len = cp - (char *) (ap) + 1;
260 * Generic internet control operations (ioctl's).
263 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
266 struct ifreq *ifr = (struct ifreq *)data;
267 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
268 struct epoch_tracker et;
270 struct in_ifaddr *ia;
274 return (EADDRNOTAVAIL);
277 * Filter out 4 ioctls we implement directly. Forward the rest
278 * to specific functions and ifp->if_ioctl().
287 sx_xlock(&in_control_sx);
288 error = in_gifaddr_ioctl(cmd, data, ifp, td);
289 sx_xunlock(&in_control_sx);
292 sx_xlock(&in_control_sx);
293 error = in_difaddr_ioctl(cmd, data, ifp, td);
294 sx_xunlock(&in_control_sx);
296 case OSIOCAIFADDR: /* 9.x compat */
298 sx_xlock(&in_control_sx);
299 error = in_aifaddr_ioctl(cmd, data, ifp, td);
300 sx_xunlock(&in_control_sx);
306 /* We no longer support that old commands. */
309 if (ifp->if_ioctl == NULL)
311 return ((*ifp->if_ioctl)(ifp, cmd, data));
314 if (addr->sin_addr.s_addr != INADDR_ANY &&
315 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
316 return (EADDRNOTAVAIL);
319 * Find address for this interface, if it exists. If an
320 * address was specified, find that one instead of the
321 * first one on the interface, if possible.
324 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
325 if (ifa->ifa_addr->sa_family != AF_INET)
327 ia = (struct in_ifaddr *)ifa;
328 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
332 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
333 if (ifa->ifa_addr->sa_family == AF_INET) {
334 ia = (struct in_ifaddr *)ifa;
335 if (prison_check_ip4(td->td_ucred,
336 &ia->ia_addr.sin_addr) == 0)
342 return (EADDRNOTAVAIL);
352 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
356 *addr = ia->ia_broadaddr;
360 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
364 *addr = ia->ia_dstaddr;
368 *addr = ia->ia_sockmask;
378 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
380 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
381 const struct sockaddr_in *addr = &ifra->ifra_addr;
382 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
383 const struct sockaddr_in *mask = &ifra->ifra_mask;
384 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
385 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
386 struct epoch_tracker et;
388 struct in_ifaddr *ia;
392 error = priv_check(td, PRIV_NET_ADDIFADDR);
397 * ifra_addr must be present and be of INET family.
398 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
400 if (addr->sin_len != sizeof(struct sockaddr_in) ||
401 addr->sin_family != AF_INET)
403 if (broadaddr->sin_len != 0 &&
404 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
405 broadaddr->sin_family != AF_INET))
407 if (mask->sin_len != 0 &&
408 (mask->sin_len != sizeof(struct sockaddr_in) ||
409 mask->sin_family != AF_INET))
411 if ((ifp->if_flags & IFF_POINTOPOINT) &&
412 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
413 dstaddr->sin_addr.s_addr == INADDR_ANY))
414 return (EDESTADDRREQ);
415 if (vhid != 0 && carp_attach_p == NULL)
416 return (EPROTONOSUPPORT);
419 * See whether address already exist.
424 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
425 struct in_ifaddr *it;
427 if (ifa->ifa_addr->sa_family != AF_INET)
430 it = (struct in_ifaddr *)ifa;
431 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
432 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
440 (void )in_difaddr_ioctl(cmd, data, ifp, td);
442 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
443 ia = (struct in_ifaddr *)ifa;
444 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
445 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
446 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
447 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
448 CALLOUT_RETURNUNLOCKED);
452 if (mask->sin_len != 0) {
453 ia->ia_sockmask = *mask;
454 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
456 in_addr_t i = ntohl(addr->sin_addr.s_addr);
459 * Be compatible with network classes, if netmask isn't
460 * supplied, guess it based on classes.
463 ia->ia_subnetmask = IN_CLASSA_NET;
464 else if (IN_CLASSB(i))
465 ia->ia_subnetmask = IN_CLASSB_NET;
467 ia->ia_subnetmask = IN_CLASSC_NET;
468 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
470 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
471 in_socktrim(&ia->ia_sockmask);
473 if (ifp->if_flags & IFF_BROADCAST) {
474 if (broadaddr->sin_len != 0) {
475 ia->ia_broadaddr = *broadaddr;
476 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
477 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
478 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
479 ia->ia_broadaddr.sin_family = AF_INET;
481 ia->ia_broadaddr.sin_addr.s_addr =
482 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
483 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
484 ia->ia_broadaddr.sin_family = AF_INET;
488 if (ifp->if_flags & IFF_POINTOPOINT)
489 ia->ia_dstaddr = *dstaddr;
492 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
497 /* if_addrhead is already referenced by ifa_alloc() */
499 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
500 IF_ADDR_WUNLOCK(ifp);
502 ifa_ref(ifa); /* in_ifaddrhead */
504 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
505 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
509 * Give the interface a chance to initialize
510 * if this is its first address,
511 * and to validate the address if necessary.
513 if (ifp->if_ioctl != NULL) {
514 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
520 * Add route for the network.
523 error = in_addprefix(ia);
529 * Add a loopback route to self.
531 if (vhid == 0 && ia_need_loopback_route(ia)) {
532 struct in_ifaddr *eia;
534 eia = in_localip_more(ia);
537 error = ifa_add_loopback_route((struct ifaddr *)ia,
538 (struct sockaddr *)&ia->ia_addr);
542 ifa_free(&eia->ia_ifa);
545 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
546 struct in_addr allhosts_addr;
547 struct in_ifinfo *ii;
549 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
550 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
552 error = in_joingroup(ifp, &allhosts_addr, NULL,
557 * Note: we don't need extra reference for ifa, since we called
558 * with sx lock held, and ifaddr can not be deleted in concurrent
561 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
567 (void )in_scrubprefix(ia, LLE_STATIC);
570 if (ia->ia_ifa.ifa_carp)
571 (*carp_detach_p)(&ia->ia_ifa, false);
574 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
575 IF_ADDR_WUNLOCK(ifp);
576 ifa_free(&ia->ia_ifa); /* if_addrhead */
579 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
580 LIST_REMOVE(ia, ia_hash);
582 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
588 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
590 const struct ifreq *ifr = (struct ifreq *)data;
591 const struct sockaddr_in *addr = (const struct sockaddr_in *)
594 struct in_ifaddr *ia;
595 bool deleteAny, iaIsLast;
599 error = priv_check(td, PRIV_NET_DELIFADDR);
604 if (addr->sin_len != sizeof(struct sockaddr_in) ||
605 addr->sin_family != AF_INET)
613 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
614 struct in_ifaddr *it;
616 if (ifa->ifa_addr->sa_family != AF_INET)
619 it = (struct in_ifaddr *)ifa;
620 if (deleteAny && ia == NULL && (td == NULL ||
621 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
624 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
625 (td == NULL || prison_check_ip4(td->td_ucred,
626 &addr->sin_addr) == 0))
634 IF_ADDR_WUNLOCK(ifp);
635 return (EADDRNOTAVAIL);
638 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
639 IF_ADDR_WUNLOCK(ifp);
640 ifa_free(&ia->ia_ifa); /* if_addrhead */
643 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
644 LIST_REMOVE(ia, ia_hash);
648 * in_scrubprefix() kills the interface route.
650 in_scrubprefix(ia, LLE_STATIC);
653 * in_ifadown gets rid of all the rest of
654 * the routes. This is not quite the right
655 * thing to do, but at least if we are running
656 * a routing process they will come back.
658 in_ifadown(&ia->ia_ifa, 1);
660 if (ia->ia_ifa.ifa_carp)
661 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
664 * If this is the last IPv4 address configured on this
665 * interface, leave the all-hosts group.
666 * No state-change report need be transmitted.
668 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
669 struct in_ifinfo *ii;
671 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
672 if (ii->ii_allhosts) {
673 (void)in_leavegroup(ii->ii_allhosts, NULL);
674 ii->ii_allhosts = NULL;
679 if (callout_stop(&ia->ia_garp_timer) == 1) {
680 ifa_free(&ia->ia_ifa);
682 IF_ADDR_WUNLOCK(ifp);
684 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
686 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
692 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
694 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
695 const struct sockaddr_in *addr = &ifra->ifra_addr;
696 struct epoch_tracker et;
698 struct in_ifaddr *ia;
701 * ifra_addr must be present and be of INET family.
703 if (addr->sin_len != sizeof(struct sockaddr_in) ||
704 addr->sin_family != AF_INET)
708 * See whether address exist.
712 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
713 struct in_ifaddr *it;
715 if (ifa->ifa_addr->sa_family != AF_INET)
718 it = (struct in_ifaddr *)ifa;
719 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
720 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
727 return (EADDRNOTAVAIL);
730 ifra->ifra_mask = ia->ia_sockmask;
731 if ((ifp->if_flags & IFF_POINTOPOINT) &&
732 ia->ia_dstaddr.sin_family == AF_INET)
733 ifra->ifra_dstaddr = ia->ia_dstaddr;
734 else if ((ifp->if_flags & IFF_BROADCAST) &&
735 ia->ia_broadaddr.sin_family == AF_INET)
736 ifra->ifra_broadaddr = ia->ia_broadaddr;
738 memset(&ifra->ifra_broadaddr, 0,
739 sizeof(ifra->ifra_broadaddr));
746 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
749 if (nh->nh_ifa == (struct ifaddr *)arg)
756 in_handle_prefix_route(uint32_t fibnum, int cmd,
757 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
763 /* Prepare gateway */
764 struct sockaddr_dl_short sdl = {
765 .sdl_family = AF_LINK,
766 .sdl_len = sizeof(struct sockaddr_dl_short),
767 .sdl_type = ifa->ifa_ifp->if_type,
768 .sdl_index = ifa->ifa_ifp->if_index,
771 struct rt_addrinfo info = {
774 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
776 [RTAX_DST] = (struct sockaddr *)dst,
777 [RTAX_NETMASK] = (struct sockaddr *)netmask,
778 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
780 /* Ensure we delete the prefix IFF prefix ifa matches */
781 .rti_filter = in_match_ifaddr,
782 .rti_filterdata = ifa,
785 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
789 * Routing table interaction with interface addresses.
791 * In general, two types of routes needs to be installed:
792 * a) "interface" or "prefix" route, telling user that the addresses
793 * behind the ifa prefix are reached directly.
794 * b) "loopback" route installed for the ifa address, telling user that
795 * the address belongs to local system.
797 * Handling for (a) and (b) differs in multi-fib aspects, hence they
798 * are implemented in different functions below.
800 * The cases above may intersect - /32 interface aliases results in
801 * the same prefix produced by (a) and (b). This blurs the definition
802 * of the "loopback" route and complicate interactions. The interaction
803 * table is defined below. The case numbers are used in the multiple
804 * functions below to refer to the particular test case.
806 * There can be multiple options:
807 * 1) Adding address with prefix on non-p2p/non-loopback interface.
808 * Example: 192.0.2.1/24. Action:
809 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
810 * using @ia as an address source.
811 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
812 * @ia ifp in the gateway and using @ia as an address source.
814 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
815 * Example: 192.0.2.2/32. Action:
816 * * add "prefix" host route via V_loif, using @ia as an address source.
818 * 3) Adding address with or without prefix to p2p interface.
819 * Example: 10.0.0.1/24->10.0.0.2. Action:
820 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
821 * as an address source. Note: no sense in installing full /24 as the interface
823 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
824 * @ia ifp in the gateway and using @ia as an address source.
826 * 4) Adding address with or without prefix to loopback interface.
827 * Example: 192.0.2.1/24. Action:
828 * * add "prefix" host route via @ia interface, using @ia as an address source.
829 * Note: Skip installing /24 prefix as it would introduce TTL loop
830 * for the traffic destined to these addresses.
834 * Checks if @ia needs to install loopback route to @ia address via
835 * ifa_maintain_loopback_route().
837 * Return true on success.
840 ia_need_loopback_route(const struct in_ifaddr *ia)
842 struct ifnet *ifp = ia->ia_ifp;
844 /* Case 4: Skip loopback interfaces */
845 if ((ifp->if_flags & IFF_LOOPBACK) ||
846 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
849 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
850 if ((ifp->if_flags & IFF_POINTOPOINT) &&
851 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
854 /* Case 2: skip /32 prefixes */
855 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
856 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
863 * Calculate "prefix" route corresponding to @ia.
866 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
869 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
870 /* Case 3: return host route for dstaddr */
871 *prefix = ia->ia_dstaddr.sin_addr;
872 mask->s_addr = INADDR_BROADCAST;
873 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
874 /* Case 4: return host route for ifaddr */
875 *prefix = ia->ia_addr.sin_addr;
876 mask->s_addr = INADDR_BROADCAST;
878 /* Cases 1,2: return actual ia prefix */
879 *prefix = ia->ia_addr.sin_addr;
880 *mask = ia->ia_sockmask.sin_addr;
881 prefix->s_addr &= mask->s_addr;
886 * Adds or delete interface "prefix" route corresponding to @ifa.
887 * Returns 0 on success or errno.
890 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
892 struct ifaddr *ifa = &ia->ia_ifa;
893 struct in_addr daddr, maddr;
894 struct sockaddr_in *pmask;
895 struct epoch_tracker et;
898 ia_getrtprefix(ia, &daddr, &maddr);
900 struct sockaddr_in mask = {
901 .sin_family = AF_INET,
902 .sin_len = sizeof(struct sockaddr_in),
906 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
908 struct sockaddr_in dst = {
909 .sin_family = AF_INET,
910 .sin_len = sizeof(struct sockaddr_in),
911 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
914 struct ifnet *ifp = ia->ia_ifp;
916 if ((maddr.s_addr == INADDR_BROADCAST) &&
917 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
918 /* Case 2: host route on broadcast interface */
922 uint32_t fibnum = ifa->ifa_ifp->if_fib;
924 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
931 * Check if we have a route for the given prefix already.
934 in_hasrtprefix(struct in_ifaddr *target)
936 struct epoch_tracker et;
937 struct in_ifaddr *ia;
938 struct in_addr prefix, mask, p, m;
941 ia_getrtprefix(target, &prefix, &mask);
943 /* Look for an existing address with the same prefix, mask, and fib */
945 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
946 ia_getrtprefix(ia, &p, &m);
948 if (prefix.s_addr != p.s_addr ||
949 mask.s_addr != m.s_addr)
952 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
956 * If we got a matching prefix route inserted by other
957 * interface address, we are done here.
959 if (ia->ia_flags & IFA_ROUTE) {
970 in_addprefix(struct in_ifaddr *target)
974 if (in_hasrtprefix(target)) {
978 rt_addrmsg(RTM_ADD, &target->ia_ifa,
979 target->ia_ifp->if_fib);
985 * No-one seem to have this prefix route, so we try to insert it.
987 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
988 error = in_handle_ifaddr_route(RTM_ADD, target);
990 target->ia_flags |= IFA_ROUTE;
995 * Removes either all lle entries for given @ia, or lle
996 * corresponding to @ia address.
999 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1001 struct sockaddr_in addr, mask;
1002 struct sockaddr *saddr, *smask;
1005 saddr = (struct sockaddr *)&addr;
1006 bzero(&addr, sizeof(addr));
1007 addr.sin_len = sizeof(addr);
1008 addr.sin_family = AF_INET;
1009 smask = (struct sockaddr *)&mask;
1010 bzero(&mask, sizeof(mask));
1011 mask.sin_len = sizeof(mask);
1012 mask.sin_family = AF_INET;
1013 mask.sin_addr.s_addr = ia->ia_subnetmask;
1018 * Remove all L2 entries matching given prefix.
1019 * Convert address to host representation to avoid
1020 * doing this on every callback. ia_subnetmask is already
1021 * stored in host representation.
1023 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1024 lltable_prefix_free(AF_INET, saddr, smask, flags);
1026 /* Remove interface address only */
1027 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1028 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1033 * If there is no other address in the system that can serve a route to the
1034 * same prefix, remove the route. Hand over the route to the new address
1038 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1040 struct epoch_tracker et;
1041 struct in_ifaddr *ia;
1042 struct in_addr prefix, mask, p, m;
1046 * Remove the loopback route to the interface address.
1048 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1049 struct in_ifaddr *eia;
1051 eia = in_localip_more(target);
1054 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1055 (struct sockaddr *)&target->ia_addr);
1056 ifa_free(&eia->ia_ifa);
1058 error = ifa_del_loopback_route((struct ifaddr *)target,
1059 (struct sockaddr *)&target->ia_addr);
1063 ia_getrtprefix(target, &prefix, &mask);
1065 if ((target->ia_flags & IFA_ROUTE) == 0) {
1066 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1069 * Removing address from !IFF_UP interface or
1070 * prefix which exists on other interface (along with route).
1071 * No entries should exist here except target addr.
1072 * Given that, delete this entry only.
1074 in_scrubprefixlle(target, 0, flags);
1078 NET_EPOCH_ENTER(et);
1079 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1080 ia_getrtprefix(ia, &p, &m);
1082 if (prefix.s_addr != p.s_addr ||
1083 mask.s_addr != m.s_addr)
1086 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1090 * If we got a matching prefix address, move IFA_ROUTE and
1091 * the route itself to it. Make sure that routing daemons
1094 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1095 ifa_ref(&ia->ia_ifa);
1097 error = in_handle_ifaddr_route(RTM_DELETE, target);
1099 target->ia_flags &= ~IFA_ROUTE;
1101 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1103 /* Scrub all entries IFF interface is different */
1104 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1106 error = in_handle_ifaddr_route(RTM_ADD, ia);
1108 ia->ia_flags |= IFA_ROUTE;
1110 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1112 ifa_free(&ia->ia_ifa);
1119 * remove all L2 entries on the given prefix
1121 in_scrubprefixlle(target, 1, flags);
1124 * As no-one seem to have this prefix, we can remove the route.
1126 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1127 error = in_handle_ifaddr_route(RTM_DELETE, target);
1129 target->ia_flags &= ~IFA_ROUTE;
1131 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1136 in_ifscrub_all(void)
1139 struct ifaddr *ifa, *nifa;
1140 struct ifaliasreq ifr;
1143 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1144 /* Cannot lock here - lock recursion. */
1145 /* NET_EPOCH_ENTER(et); */
1146 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1147 if (ifa->ifa_addr->sa_family != AF_INET)
1151 * This is ugly but the only way for legacy IP to
1152 * cleanly remove addresses and everything attached.
1154 bzero(&ifr, sizeof(ifr));
1155 ifr.ifra_addr = *ifa->ifa_addr;
1156 if (ifa->ifa_dstaddr)
1157 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
1158 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1161 /* NET_EPOCH_EXIT(et); */
1162 in_purgemaddrs(ifp);
1163 igmp_domifdetach(ifp);
1169 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1172 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1174 * Optionally check for old-style (host 0) broadcast, but
1175 * taking into account that RFC 3021 obsoletes it.
1177 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1178 ntohl(in.s_addr) == ia->ia_subnet)) &&
1180 * Check for an all one subnetmask. These
1181 * only exist when an interface gets a secondary
1184 ia->ia_subnetmask != (u_long)0xffffffff);
1188 * Return 1 if the address might be a local broadcast address.
1191 in_broadcast(struct in_addr in, struct ifnet *ifp)
1198 if (in.s_addr == INADDR_BROADCAST ||
1199 in.s_addr == INADDR_ANY)
1201 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1205 * Look through the list of addresses for a match
1206 * with a broadcast address.
1208 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1209 if (ifa->ifa_addr->sa_family == AF_INET &&
1210 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1218 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1221 in_ifdetach(struct ifnet *ifp)
1224 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1225 in_pcbpurgeif0(&V_udbinfo, ifp);
1226 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1227 in_purgemaddrs(ifp);
1231 * Make sure all multicast deletions invoking if_ioctl() are
1232 * completed before returning. Else we risk accessing a freed
1233 * ifnet structure pointer.
1235 inm_release_wait(NULL);
1239 * Delete all IPv4 multicast address records, and associated link-layer
1240 * multicast address records, associated with ifp.
1241 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1242 * XXX This should not race with ifma_protospec being set during
1243 * a new allocation, if it does, we have bigger problems.
1246 in_purgemaddrs(struct ifnet *ifp)
1248 struct in_multi_head purgeinms;
1249 struct in_multi *inm;
1250 struct ifmultiaddr *ifma, *next;
1252 SLIST_INIT(&purgeinms);
1253 IN_MULTI_LIST_LOCK();
1256 * Extract list of in_multi associated with the detaching ifp
1257 * which the PF_INET layer is about to release.
1258 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1259 * by code further down.
1263 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1264 if (ifma->ifma_addr->sa_family != AF_INET ||
1265 ifma->ifma_protospec == NULL)
1267 inm = (struct in_multi *)ifma->ifma_protospec;
1268 inm_rele_locked(&purgeinms, inm);
1269 if (__predict_false(ifma_restart)) {
1270 ifma_restart = true;
1274 IF_ADDR_WUNLOCK(ifp);
1276 inm_release_list_deferred(&purgeinms);
1278 IN_MULTI_LIST_UNLOCK();
1282 struct llentry base;
1285 #define IN_LLTBL_DEFAULT_HSIZE 32
1286 #define IN_LLTBL_HASH(k, h) \
1287 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1290 * Do actual deallocation of @lle.
1293 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1295 struct llentry *lle;
1297 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1298 LLE_LOCK_DESTROY(lle);
1299 LLE_REQ_DESTROY(lle);
1300 free(lle, M_LLTABLE);
1304 * Called by LLE_FREE_LOCKED when number of references
1308 in_lltable_destroy_lle(struct llentry *lle)
1312 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1315 static struct llentry *
1316 in_lltable_new(struct in_addr addr4, u_int flags)
1318 struct in_llentry *lle;
1320 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1321 if (lle == NULL) /* NB: caller generates msg */
1325 * For IPv4 this will trigger "arpresolve" to generate
1328 lle->base.la_expire = time_uptime; /* mark expired */
1329 lle->base.r_l3addr.addr4 = addr4;
1330 lle->base.lle_refcnt = 1;
1331 lle->base.lle_free = in_lltable_destroy_lle;
1332 LLE_LOCK_INIT(&lle->base);
1333 LLE_REQ_INIT(&lle->base);
1334 callout_init(&lle->base.lle_timer, 1);
1336 return (&lle->base);
1339 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1340 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1343 in_lltable_match_prefix(const struct sockaddr *saddr,
1344 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1346 struct in_addr addr, mask, lle_addr;
1348 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1349 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1350 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1352 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1355 if (lle->la_flags & LLE_IFADDR) {
1357 * Delete LLE_IFADDR records IFF address & flag matches.
1358 * Note that addr is the interface address within prefix
1360 * Note also we should handle 'ifdown' cases without removing
1363 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1368 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1369 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1376 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1378 size_t pkts_dropped;
1380 LLE_WLOCK_ASSERT(lle);
1381 KASSERT(llt != NULL, ("lltable is NULL"));
1383 /* Unlink entry from table if not already */
1384 if ((lle->la_flags & LLE_LINKED) != 0) {
1385 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1386 lltable_unlink_entry(llt, lle);
1389 /* Drop hold queue */
1390 pkts_dropped = llentry_free(lle);
1391 ARPSTAT_ADD(dropped, pkts_dropped);
1395 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1397 struct nhop_object *nh;
1398 struct in_addr addr;
1400 KASSERT(l3addr->sa_family == AF_INET,
1401 ("sin_family %d", l3addr->sa_family));
1403 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1405 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1410 * If the gateway for an existing host route matches the target L3
1411 * address, which is a special route inserted by some implementation
1412 * such as MANET, and the interface is of the correct type, then
1413 * allow for ARP to proceed.
1415 if (nh->nh_flags & NHF_GATEWAY) {
1416 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1417 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1418 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1419 sizeof(in_addr_t)) != 0) {
1425 * Make sure that at least the destination address is covered
1426 * by the route. This is for handling the case where 2 or more
1427 * interfaces have the same prefix. An incoming packet arrives
1428 * on one interface and the corresponding outgoing packet leaves
1429 * another interface.
1431 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1432 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1433 struct in_addr dst_addr, mask_addr;
1439 * ifaof_ifpforaddr() returns _best matching_ IFA.
1440 * It is possible that ifa prefix does not cover our address.
1441 * Explicitly verify and fail if that's the case.
1443 dst_addr = IA_SIN(ia)->sin_addr;
1444 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1446 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1453 static inline uint32_t
1454 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1457 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1461 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1464 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1468 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1470 struct sockaddr_in *sin;
1472 sin = (struct sockaddr_in *)sa;
1473 bzero(sin, sizeof(*sin));
1474 sin->sin_family = AF_INET;
1475 sin->sin_len = sizeof(*sin);
1476 sin->sin_addr = lle->r_l3addr.addr4;
1479 static inline struct llentry *
1480 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1482 struct llentry *lle;
1483 struct llentries *lleh;
1486 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1487 lleh = &llt->lle_head[hashidx];
1488 CK_LIST_FOREACH(lle, lleh, lle_next) {
1489 if (lle->la_flags & LLE_DELETED)
1491 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1499 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1502 lle->la_flags |= LLE_DELETED;
1503 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1505 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1510 static struct llentry *
1511 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1513 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1514 struct ifnet *ifp = llt->llt_ifp;
1515 struct llentry *lle;
1516 char linkhdr[LLE_MAX_LINKHDR];
1520 KASSERT(l3addr->sa_family == AF_INET,
1521 ("sin_family %d", l3addr->sa_family));
1524 * A route that covers the given address must have
1525 * been installed 1st because we are doing a resolution,
1528 if (!(flags & LLE_IFADDR) &&
1529 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1532 lle = in_lltable_new(sin->sin_addr, flags);
1534 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1537 lle->la_flags = flags;
1538 if (flags & LLE_STATIC)
1539 lle->r_flags |= RLLE_VALID;
1540 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1541 linkhdrsize = LLE_MAX_LINKHDR;
1542 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1543 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1544 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1547 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1549 lle->la_flags |= LLE_STATIC;
1550 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1557 * Return NULL if not found or marked for deletion.
1558 * If found return lle read locked.
1560 static struct llentry *
1561 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1563 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1564 struct llentry *lle;
1566 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1567 KASSERT(l3addr->sa_family == AF_INET,
1568 ("sin_family %d", l3addr->sa_family));
1569 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1570 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1571 ("wrong lle request flags: %#x", flags));
1573 lle = in_lltable_find_dst(llt, sin->sin_addr);
1576 if (flags & LLE_UNLOCKED)
1579 if (flags & LLE_EXCLUSIVE)
1585 * If the afdata lock is not held, the LLE may have been unlinked while
1586 * we were blocked on the LLE lock. Check for this case.
1588 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1589 if (flags & LLE_EXCLUSIVE)
1599 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1600 struct sysctl_req *wr)
1602 struct ifnet *ifp = llt->llt_ifp;
1605 struct rt_msghdr rtm;
1606 struct sockaddr_in sin;
1607 struct sockaddr_dl sdl;
1609 struct sockaddr_dl *sdl;
1612 bzero(&arpc, sizeof(arpc));
1613 /* skip deleted entries */
1614 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1616 /* Skip if jailed and not a valid IP of the prison. */
1617 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1618 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1621 * produce a msg made of:
1623 * struct sockaddr_in; (IPv4)
1624 * struct sockaddr_dl;
1626 arpc.rtm.rtm_msglen = sizeof(arpc);
1627 arpc.rtm.rtm_version = RTM_VERSION;
1628 arpc.rtm.rtm_type = RTM_GET;
1629 arpc.rtm.rtm_flags = RTF_UP;
1630 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1633 if (lle->la_flags & LLE_PUB)
1634 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1637 sdl->sdl_family = AF_LINK;
1638 sdl->sdl_len = sizeof(*sdl);
1639 sdl->sdl_index = ifp->if_index;
1640 sdl->sdl_type = ifp->if_type;
1641 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1642 sdl->sdl_alen = ifp->if_addrlen;
1643 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1646 bzero(LLADDR(sdl), ifp->if_addrlen);
1649 arpc.rtm.rtm_rmx.rmx_expire =
1650 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1651 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1652 if (lle->la_flags & LLE_STATIC)
1653 arpc.rtm.rtm_flags |= RTF_STATIC;
1654 if (lle->la_flags & LLE_IFADDR)
1655 arpc.rtm.rtm_flags |= RTF_PINNED;
1656 arpc.rtm.rtm_index = ifp->if_index;
1657 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1662 static struct lltable *
1663 in_lltattach(struct ifnet *ifp)
1665 struct lltable *llt;
1667 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1668 llt->llt_af = AF_INET;
1671 llt->llt_lookup = in_lltable_lookup;
1672 llt->llt_alloc_entry = in_lltable_alloc;
1673 llt->llt_delete_entry = in_lltable_delete_entry;
1674 llt->llt_dump_entry = in_lltable_dump_entry;
1675 llt->llt_hash = in_lltable_hash;
1676 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1677 llt->llt_free_entry = in_lltable_free_entry;
1678 llt->llt_match_prefix = in_lltable_match_prefix;
1679 llt->llt_mark_used = llentry_mark_used;
1686 in_domifattach(struct ifnet *ifp)
1688 struct in_ifinfo *ii;
1690 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1692 ii->ii_llt = in_lltattach(ifp);
1693 ii->ii_igmp = igmp_domifattach(ifp);
1699 in_domifdetach(struct ifnet *ifp, void *aux)
1701 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1703 igmp_domifdetach(ifp);
1704 lltable_free(ii->ii_llt);