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 "opt_mpath.h"
40 #include <sys/param.h>
41 #include <sys/eventhandler.h>
42 #include <sys/systm.h>
43 #include <sys/sockio.h>
44 #include <sys/malloc.h>
46 #include <sys/socket.h>
48 #include <sys/kernel.h>
51 #include <sys/rmlock.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.h>
57 #include <net/if_var.h>
58 #include <net/if_arp.h>
59 #include <net/if_dl.h>
60 #include <net/if_llatbl.h>
61 #include <net/if_types.h>
62 #include <net/route.h>
65 #include <netinet/if_ether.h>
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/in_pcb.h>
69 #include <netinet/ip_var.h>
70 #include <netinet/ip_carp.h>
71 #include <netinet/igmp_var.h>
72 #include <netinet/udp.h>
73 #include <netinet/udp_var.h>
75 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
76 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
78 static void in_socktrim(struct sockaddr_in *);
79 static void in_purgemaddrs(struct ifnet *);
81 VNET_DEFINE_STATIC(int, nosameprefix);
82 #define V_nosameprefix VNET(nosameprefix)
83 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
84 &VNET_NAME(nosameprefix), 0,
85 "Refuse to create same prefixes on different interfaces");
87 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
88 #define V_ripcbinfo VNET(ripcbinfo)
90 static struct sx in_control_sx;
91 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
94 * Return 1 if an internet address is for a ``local'' host
95 * (one to which we have a connection).
98 in_localaddr(struct in_addr in)
100 struct rm_priotracker in_ifa_tracker;
101 u_long i = ntohl(in.s_addr);
102 struct in_ifaddr *ia;
104 IN_IFADDR_RLOCK(&in_ifa_tracker);
105 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
106 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
107 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
111 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
116 * Return 1 if an internet address is for the local host and configured
117 * on one of its interfaces.
120 in_localip(struct in_addr in)
122 struct rm_priotracker in_ifa_tracker;
123 struct in_ifaddr *ia;
125 IN_IFADDR_RLOCK(&in_ifa_tracker);
126 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
127 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
128 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
132 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
137 * Return 1 if an internet address is configured on an interface.
140 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
142 struct epoch_tracker et;
144 struct in_ifaddr *ia;
147 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
148 if (ifa->ifa_addr->sa_family != AF_INET)
150 ia = (struct in_ifaddr *)ifa;
151 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) {
162 * Return a reference to the interface address which is different to
163 * the supplied one but with same IP address value.
165 static struct in_ifaddr *
166 in_localip_more(struct in_ifaddr *ia)
168 struct rm_priotracker in_ifa_tracker;
169 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
170 struct in_ifaddr *it;
172 IN_IFADDR_RLOCK(&in_ifa_tracker);
173 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
174 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
175 ifa_ref(&it->ia_ifa);
176 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
180 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
186 * Determine whether an IP address is in a reserved set of addresses
187 * that may not be forwarded, or whether datagrams to that destination
191 in_canforward(struct in_addr in)
193 u_long i = ntohl(in.s_addr);
196 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
199 net = i & IN_CLASSA_NET;
200 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
207 * Trim a mask in a sockaddr
210 in_socktrim(struct sockaddr_in *ap)
212 char *cplim = (char *) &ap->sin_addr;
213 char *cp = (char *) (&ap->sin_addr + 1);
216 while (--cp >= cplim)
218 (ap)->sin_len = cp - (char *) (ap) + 1;
224 * Generic internet control operations (ioctl's).
227 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
230 struct ifreq *ifr = (struct ifreq *)data;
231 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
232 struct epoch_tracker et;
234 struct in_ifaddr *ia;
238 return (EADDRNOTAVAIL);
241 * Filter out 4 ioctls we implement directly. Forward the rest
242 * to specific functions and ifp->if_ioctl().
251 sx_xlock(&in_control_sx);
252 error = in_difaddr_ioctl(cmd, data, ifp, td);
253 sx_xunlock(&in_control_sx);
255 case OSIOCAIFADDR: /* 9.x compat */
257 sx_xlock(&in_control_sx);
258 error = in_aifaddr_ioctl(cmd, data, ifp, td);
259 sx_xunlock(&in_control_sx);
265 /* We no longer support that old commands. */
268 if (ifp->if_ioctl == NULL)
270 return ((*ifp->if_ioctl)(ifp, cmd, data));
273 if (addr->sin_addr.s_addr != INADDR_ANY &&
274 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
275 return (EADDRNOTAVAIL);
278 * Find address for this interface, if it exists. If an
279 * address was specified, find that one instead of the
280 * first one on the interface, if possible.
283 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
284 if (ifa->ifa_addr->sa_family != AF_INET)
286 ia = (struct in_ifaddr *)ifa;
287 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
291 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
292 if (ifa->ifa_addr->sa_family == AF_INET) {
293 ia = (struct in_ifaddr *)ifa;
294 if (prison_check_ip4(td->td_ucred,
295 &ia->ia_addr.sin_addr) == 0)
301 return (EADDRNOTAVAIL);
311 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
315 *addr = ia->ia_broadaddr;
319 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
323 *addr = ia->ia_dstaddr;
327 *addr = ia->ia_sockmask;
337 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
339 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
340 const struct sockaddr_in *addr = &ifra->ifra_addr;
341 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
342 const struct sockaddr_in *mask = &ifra->ifra_mask;
343 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
344 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
345 struct epoch_tracker et;
347 struct in_ifaddr *ia;
351 error = priv_check(td, PRIV_NET_ADDIFADDR);
356 * ifra_addr must be present and be of INET family.
357 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
359 if (addr->sin_len != sizeof(struct sockaddr_in) ||
360 addr->sin_family != AF_INET)
362 if (broadaddr->sin_len != 0 &&
363 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
364 broadaddr->sin_family != AF_INET))
366 if (mask->sin_len != 0 &&
367 (mask->sin_len != sizeof(struct sockaddr_in) ||
368 mask->sin_family != AF_INET))
370 if ((ifp->if_flags & IFF_POINTOPOINT) &&
371 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
372 dstaddr->sin_addr.s_addr == INADDR_ANY))
373 return (EDESTADDRREQ);
374 if (vhid > 0 && carp_attach_p == NULL)
375 return (EPROTONOSUPPORT);
378 * See whether address already exist.
383 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
384 struct in_ifaddr *it;
386 if (ifa->ifa_addr->sa_family != AF_INET)
389 it = (struct in_ifaddr *)ifa;
391 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
392 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
398 (void )in_difaddr_ioctl(cmd, data, ifp, td);
400 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
401 ia = (struct in_ifaddr *)ifa;
402 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
403 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
404 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
405 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
406 CALLOUT_RETURNUNLOCKED);
410 if (mask->sin_len != 0) {
411 ia->ia_sockmask = *mask;
412 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
414 in_addr_t i = ntohl(addr->sin_addr.s_addr);
417 * Be compatible with network classes, if netmask isn't
418 * supplied, guess it based on classes.
421 ia->ia_subnetmask = IN_CLASSA_NET;
422 else if (IN_CLASSB(i))
423 ia->ia_subnetmask = IN_CLASSB_NET;
425 ia->ia_subnetmask = IN_CLASSC_NET;
426 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
428 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
429 in_socktrim(&ia->ia_sockmask);
431 if (ifp->if_flags & IFF_BROADCAST) {
432 if (broadaddr->sin_len != 0) {
433 ia->ia_broadaddr = *broadaddr;
434 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
435 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
436 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
437 ia->ia_broadaddr.sin_family = AF_INET;
439 ia->ia_broadaddr.sin_addr.s_addr =
440 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
441 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
442 ia->ia_broadaddr.sin_family = AF_INET;
446 if (ifp->if_flags & IFF_POINTOPOINT)
447 ia->ia_dstaddr = *dstaddr;
449 /* XXXGL: rtinit() needs this strange assignment. */
450 if (ifp->if_flags & IFF_LOOPBACK)
451 ia->ia_dstaddr = ia->ia_addr;
454 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
459 /* if_addrhead is already referenced by ifa_alloc() */
461 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
462 IF_ADDR_WUNLOCK(ifp);
464 ifa_ref(ifa); /* in_ifaddrhead */
466 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
467 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
471 * Give the interface a chance to initialize
472 * if this is its first address,
473 * and to validate the address if necessary.
475 if (ifp->if_ioctl != NULL) {
476 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
482 * Add route for the network.
487 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
490 error = in_addprefix(ia, flags);
496 * Add a loopback route to self.
498 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
499 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
500 !((ifp->if_flags & IFF_POINTOPOINT) &&
501 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
502 struct in_ifaddr *eia;
504 eia = in_localip_more(ia);
507 error = ifa_add_loopback_route((struct ifaddr *)ia,
508 (struct sockaddr *)&ia->ia_addr);
512 ifa_free(&eia->ia_ifa);
515 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
516 struct in_addr allhosts_addr;
517 struct in_ifinfo *ii;
519 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
520 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
522 error = in_joingroup(ifp, &allhosts_addr, NULL,
527 * Note: we don't need extra reference for ifa, since we called
528 * with sx lock held, and ifaddr can not be deleted in concurrent
531 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
537 (void )in_scrubprefix(ia, LLE_STATIC);
540 if (ia->ia_ifa.ifa_carp)
541 (*carp_detach_p)(&ia->ia_ifa, false);
544 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
545 IF_ADDR_WUNLOCK(ifp);
546 ifa_free(&ia->ia_ifa); /* if_addrhead */
549 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
550 LIST_REMOVE(ia, ia_hash);
552 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
558 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
560 const struct ifreq *ifr = (struct ifreq *)data;
561 const struct sockaddr_in *addr = (const struct sockaddr_in *)
564 struct in_ifaddr *ia;
565 bool deleteAny, iaIsLast;
569 error = priv_check(td, PRIV_NET_DELIFADDR);
574 if (addr->sin_len != sizeof(struct sockaddr_in) ||
575 addr->sin_family != AF_INET)
583 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
584 struct in_ifaddr *it;
586 if (ifa->ifa_addr->sa_family != AF_INET)
589 it = (struct in_ifaddr *)ifa;
590 if (deleteAny && ia == NULL && (td == NULL ||
591 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
594 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
595 (td == NULL || prison_check_ip4(td->td_ucred,
596 &addr->sin_addr) == 0))
604 IF_ADDR_WUNLOCK(ifp);
605 return (EADDRNOTAVAIL);
608 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
609 IF_ADDR_WUNLOCK(ifp);
610 ifa_free(&ia->ia_ifa); /* if_addrhead */
613 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
614 LIST_REMOVE(ia, ia_hash);
618 * in_scrubprefix() kills the interface route.
620 in_scrubprefix(ia, LLE_STATIC);
623 * in_ifadown gets rid of all the rest of
624 * the routes. This is not quite the right
625 * thing to do, but at least if we are running
626 * a routing process they will come back.
628 in_ifadown(&ia->ia_ifa, 1);
630 if (ia->ia_ifa.ifa_carp)
631 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
634 * If this is the last IPv4 address configured on this
635 * interface, leave the all-hosts group.
636 * No state-change report need be transmitted.
638 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
639 struct in_ifinfo *ii;
641 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
642 if (ii->ii_allhosts) {
643 (void)in_leavegroup(ii->ii_allhosts, NULL);
644 ii->ii_allhosts = NULL;
649 if (callout_stop(&ia->ia_garp_timer) == 1) {
650 ifa_free(&ia->ia_ifa);
652 IF_ADDR_WUNLOCK(ifp);
654 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
656 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
661 #define rtinitflags(x) \
662 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
666 * Check if we have a route for the given prefix already or add one accordingly.
669 in_addprefix(struct in_ifaddr *target, int flags)
671 struct rm_priotracker in_ifa_tracker;
672 struct in_ifaddr *ia;
673 struct in_addr prefix, mask, p, m;
676 if ((flags & RTF_HOST) != 0) {
677 prefix = target->ia_dstaddr.sin_addr;
680 prefix = target->ia_addr.sin_addr;
681 mask = target->ia_sockmask.sin_addr;
682 prefix.s_addr &= mask.s_addr;
685 IN_IFADDR_RLOCK(&in_ifa_tracker);
686 /* Look for an existing address with the same prefix, mask, and fib */
687 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
688 if (rtinitflags(ia)) {
689 p = ia->ia_dstaddr.sin_addr;
691 if (prefix.s_addr != p.s_addr)
694 p = ia->ia_addr.sin_addr;
695 m = ia->ia_sockmask.sin_addr;
696 p.s_addr &= m.s_addr;
698 if (prefix.s_addr != p.s_addr ||
699 mask.s_addr != m.s_addr)
702 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
706 * If we got a matching prefix route inserted by other
707 * interface address, we are done here.
709 if (ia->ia_flags & IFA_ROUTE) {
711 if (ia->ia_addr.sin_addr.s_addr ==
712 target->ia_addr.sin_addr.s_addr) {
713 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
718 if (V_nosameprefix) {
719 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
724 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
725 target->ia_ifp->if_fib;
726 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
727 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
732 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
735 * No-one seem to have this prefix route, so we try to insert it.
737 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
739 target->ia_flags |= IFA_ROUTE;
744 * Removes either all lle entries for given @ia, or lle
745 * corresponding to @ia address.
748 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
750 struct sockaddr_in addr, mask;
751 struct sockaddr *saddr, *smask;
754 saddr = (struct sockaddr *)&addr;
755 bzero(&addr, sizeof(addr));
756 addr.sin_len = sizeof(addr);
757 addr.sin_family = AF_INET;
758 smask = (struct sockaddr *)&mask;
759 bzero(&mask, sizeof(mask));
760 mask.sin_len = sizeof(mask);
761 mask.sin_family = AF_INET;
762 mask.sin_addr.s_addr = ia->ia_subnetmask;
768 * Remove all L2 entries matching given prefix.
769 * Convert address to host representation to avoid
770 * doing this on every callback. ia_subnetmask is already
771 * stored in host representation.
773 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
774 lltable_prefix_free(AF_INET, saddr, smask, flags);
776 /* Remove interface address only */
777 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
778 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
783 * If there is no other address in the system that can serve a route to the
784 * same prefix, remove the route. Hand over the route to the new address
788 in_scrubprefix(struct in_ifaddr *target, u_int flags)
790 struct rm_priotracker in_ifa_tracker;
791 struct in_ifaddr *ia;
792 struct in_addr prefix, mask, p, m;
796 * Remove the loopback route to the interface address.
798 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
799 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
800 (flags & LLE_STATIC)) {
801 struct in_ifaddr *eia;
804 * XXXME: add fib-aware in_localip.
805 * We definitely don't want to switch between
806 * prefixes in different fibs.
808 eia = in_localip_more(target);
811 error = ifa_switch_loopback_route((struct ifaddr *)eia,
812 (struct sockaddr *)&target->ia_addr);
813 ifa_free(&eia->ia_ifa);
815 error = ifa_del_loopback_route((struct ifaddr *)target,
816 (struct sockaddr *)&target->ia_addr);
820 if (rtinitflags(target)) {
821 prefix = target->ia_dstaddr.sin_addr;
824 prefix = target->ia_addr.sin_addr;
825 mask = target->ia_sockmask.sin_addr;
826 prefix.s_addr &= mask.s_addr;
829 if ((target->ia_flags & IFA_ROUTE) == 0) {
832 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
833 target->ia_ifp->if_fib;
834 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
837 * Removing address from !IFF_UP interface or
838 * prefix which exists on other interface (along with route).
839 * No entries should exist here except target addr.
840 * Given that, delete this entry only.
842 in_scrubprefixlle(target, 0, flags);
846 IN_IFADDR_RLOCK(&in_ifa_tracker);
847 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
848 if (rtinitflags(ia)) {
849 p = ia->ia_dstaddr.sin_addr;
851 if (prefix.s_addr != p.s_addr)
854 p = ia->ia_addr.sin_addr;
855 m = ia->ia_sockmask.sin_addr;
856 p.s_addr &= m.s_addr;
858 if (prefix.s_addr != p.s_addr ||
859 mask.s_addr != m.s_addr)
863 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
867 * If we got a matching prefix address, move IFA_ROUTE and
868 * the route itself to it. Make sure that routing daemons
871 if ((ia->ia_flags & IFA_ROUTE) == 0) {
872 ifa_ref(&ia->ia_ifa);
873 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
874 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
875 rtinitflags(target));
877 target->ia_flags &= ~IFA_ROUTE;
879 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
881 /* Scrub all entries IFF interface is different */
882 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
884 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
885 rtinitflags(ia) | RTF_UP);
887 ia->ia_flags |= IFA_ROUTE;
889 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
891 ifa_free(&ia->ia_ifa);
895 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
898 * remove all L2 entries on the given prefix
900 in_scrubprefixlle(target, 1, flags);
903 * As no-one seem to have this prefix, we can remove the route.
905 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
907 target->ia_flags &= ~IFA_ROUTE;
909 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
919 struct ifaddr *ifa, *nifa;
920 struct ifaliasreq ifr;
923 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
924 /* Cannot lock here - lock recursion. */
925 /* NET_EPOCH_ENTER(et); */
926 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
927 if (ifa->ifa_addr->sa_family != AF_INET)
931 * This is ugly but the only way for legacy IP to
932 * cleanly remove addresses and everything attached.
934 bzero(&ifr, sizeof(ifr));
935 ifr.ifra_addr = *ifa->ifa_addr;
936 if (ifa->ifa_dstaddr)
937 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
938 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
941 /* NET_EPOCH_EXIT(et); */
943 igmp_domifdetach(ifp);
949 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
952 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
954 * Check for old-style (host 0) broadcast, but
955 * taking into account that RFC 3021 obsoletes it.
957 (ia->ia_subnetmask != IN_RFC3021_MASK &&
958 ntohl(in.s_addr) == ia->ia_subnet)) &&
960 * Check for an all one subnetmask. These
961 * only exist when an interface gets a secondary
964 ia->ia_subnetmask != (u_long)0xffffffff);
968 * Return 1 if the address might be a local broadcast address.
971 in_broadcast(struct in_addr in, struct ifnet *ifp)
973 struct epoch_tracker et;
977 if (in.s_addr == INADDR_BROADCAST ||
978 in.s_addr == INADDR_ANY)
980 if ((ifp->if_flags & IFF_BROADCAST) == 0)
984 * Look through the list of addresses for a match
985 * with a broadcast address.
988 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
989 if (ifa->ifa_addr->sa_family == AF_INET &&
990 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
999 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1002 in_ifdetach(struct ifnet *ifp)
1005 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1006 in_pcbpurgeif0(&V_udbinfo, ifp);
1007 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1008 in_purgemaddrs(ifp);
1013 * Delete all IPv4 multicast address records, and associated link-layer
1014 * multicast address records, associated with ifp.
1015 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1016 * XXX This should not race with ifma_protospec being set during
1017 * a new allocation, if it does, we have bigger problems.
1020 in_purgemaddrs(struct ifnet *ifp)
1022 struct in_multi_head purgeinms;
1023 struct in_multi *inm;
1024 struct ifmultiaddr *ifma, *next;
1026 SLIST_INIT(&purgeinms);
1027 IN_MULTI_LIST_LOCK();
1030 * Extract list of in_multi associated with the detaching ifp
1031 * which the PF_INET layer is about to release.
1032 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1033 * by code further down.
1037 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1038 if (ifma->ifma_addr->sa_family != AF_INET ||
1039 ifma->ifma_protospec == NULL)
1041 inm = (struct in_multi *)ifma->ifma_protospec;
1042 inm_rele_locked(&purgeinms, inm);
1043 if (__predict_false(ifma_restart)) {
1044 ifma_restart = true;
1048 IF_ADDR_WUNLOCK(ifp);
1050 inm_release_list_deferred(&purgeinms);
1052 IN_MULTI_LIST_UNLOCK();
1056 struct llentry base;
1059 #define IN_LLTBL_DEFAULT_HSIZE 32
1060 #define IN_LLTBL_HASH(k, h) \
1061 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1064 * Do actual deallocation of @lle.
1067 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1069 struct llentry *lle;
1071 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1072 LLE_LOCK_DESTROY(lle);
1073 LLE_REQ_DESTROY(lle);
1074 free(lle, M_LLTABLE);
1078 * Called by the datapath to indicate that
1079 * the entry was used.
1082 in_lltable_mark_used(struct llentry *lle)
1086 lle->r_skip_req = 0;
1087 LLE_REQ_UNLOCK(lle);
1091 * Called by LLE_FREE_LOCKED when number of references
1095 in_lltable_destroy_lle(struct llentry *lle)
1099 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked);
1102 static struct llentry *
1103 in_lltable_new(struct in_addr addr4, u_int flags)
1105 struct in_llentry *lle;
1107 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1108 if (lle == NULL) /* NB: caller generates msg */
1112 * For IPv4 this will trigger "arpresolve" to generate
1115 lle->base.la_expire = time_uptime; /* mark expired */
1116 lle->base.r_l3addr.addr4 = addr4;
1117 lle->base.lle_refcnt = 1;
1118 lle->base.lle_free = in_lltable_destroy_lle;
1119 LLE_LOCK_INIT(&lle->base);
1120 LLE_REQ_INIT(&lle->base);
1121 callout_init(&lle->base.lle_timer, 1);
1123 return (&lle->base);
1126 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1127 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1130 in_lltable_match_prefix(const struct sockaddr *saddr,
1131 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1133 struct in_addr addr, mask, lle_addr;
1135 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1136 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1137 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1139 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1142 if (lle->la_flags & LLE_IFADDR) {
1145 * Delete LLE_IFADDR records IFF address & flag matches.
1146 * Note that addr is the interface address within prefix
1148 * Note also we should handle 'ifdown' cases without removing
1151 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1156 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1157 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1164 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1166 size_t pkts_dropped;
1168 LLE_WLOCK_ASSERT(lle);
1169 KASSERT(llt != NULL, ("lltable is NULL"));
1171 /* Unlink entry from table if not already */
1172 if ((lle->la_flags & LLE_LINKED) != 0) {
1173 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1174 lltable_unlink_entry(llt, lle);
1177 /* Drop hold queue */
1178 pkts_dropped = llentry_free(lle);
1179 ARPSTAT_ADD(dropped, pkts_dropped);
1183 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1185 struct rt_addrinfo info;
1186 struct sockaddr_in rt_key, rt_mask;
1187 struct sockaddr rt_gateway;
1190 KASSERT(l3addr->sa_family == AF_INET,
1191 ("sin_family %d", l3addr->sa_family));
1193 bzero(&rt_key, sizeof(rt_key));
1194 rt_key.sin_len = sizeof(rt_key);
1195 bzero(&rt_mask, sizeof(rt_mask));
1196 rt_mask.sin_len = sizeof(rt_mask);
1197 bzero(&rt_gateway, sizeof(rt_gateway));
1198 rt_gateway.sa_len = sizeof(rt_gateway);
1200 bzero(&info, sizeof(info));
1201 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1202 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
1203 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
1205 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
1208 rt_flags = info.rti_flags;
1211 * If the gateway for an existing host route matches the target L3
1212 * address, which is a special route inserted by some implementation
1213 * such as MANET, and the interface is of the correct type, then
1214 * allow for ARP to proceed.
1216 if (rt_flags & RTF_GATEWAY) {
1217 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
1218 info.rti_ifp->if_type != IFT_ETHER ||
1219 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1220 memcmp(rt_gateway.sa_data, l3addr->sa_data,
1221 sizeof(in_addr_t)) != 0) {
1222 rib_free_info(&info);
1226 rib_free_info(&info);
1229 * Make sure that at least the destination address is covered
1230 * by the route. This is for handling the case where 2 or more
1231 * interfaces have the same prefix. An incoming packet arrives
1232 * on one interface and the corresponding outgoing packet leaves
1233 * another interface.
1235 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
1236 const char *sa, *mask, *addr, *lim;
1237 const struct sockaddr_in *l3sin;
1239 mask = (const char *)&rt_mask;
1241 * Just being extra cautious to avoid some custom
1242 * code getting into trouble.
1244 if ((info.rti_addrs & RTA_NETMASK) == 0)
1247 sa = (const char *)&rt_key;
1248 addr = (const char *)l3addr;
1249 l3sin = (const struct sockaddr_in *)l3addr;
1250 lim = addr + l3sin->sin_len;
1252 for ( ; addr < lim; sa++, mask++, addr++) {
1253 if ((*sa ^ *addr) & *mask) {
1255 char addrbuf[INET_ADDRSTRLEN];
1257 log(LOG_INFO, "IPv4 address: \"%s\" "
1258 "is not on the network\n",
1259 inet_ntoa_r(l3sin->sin_addr, addrbuf));
1269 static inline uint32_t
1270 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1273 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1277 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1280 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1284 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1286 struct sockaddr_in *sin;
1288 sin = (struct sockaddr_in *)sa;
1289 bzero(sin, sizeof(*sin));
1290 sin->sin_family = AF_INET;
1291 sin->sin_len = sizeof(*sin);
1292 sin->sin_addr = lle->r_l3addr.addr4;
1295 static inline struct llentry *
1296 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1298 struct llentry *lle;
1299 struct llentries *lleh;
1302 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1303 lleh = &llt->lle_head[hashidx];
1304 CK_LIST_FOREACH(lle, lleh, lle_next) {
1305 if (lle->la_flags & LLE_DELETED)
1307 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1315 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1318 lle->la_flags |= LLE_DELETED;
1319 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1321 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1326 static struct llentry *
1327 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1329 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1330 struct ifnet *ifp = llt->llt_ifp;
1331 struct llentry *lle;
1332 char linkhdr[LLE_MAX_LINKHDR];
1336 KASSERT(l3addr->sa_family == AF_INET,
1337 ("sin_family %d", l3addr->sa_family));
1340 * A route that covers the given address must have
1341 * been installed 1st because we are doing a resolution,
1344 if (!(flags & LLE_IFADDR) &&
1345 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1348 lle = in_lltable_new(sin->sin_addr, flags);
1350 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1353 lle->la_flags = flags;
1354 if (flags & LLE_STATIC)
1355 lle->r_flags |= RLLE_VALID;
1356 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1357 linkhdrsize = LLE_MAX_LINKHDR;
1358 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1359 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1360 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked);
1363 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1365 lle->la_flags |= LLE_STATIC;
1366 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1373 * Return NULL if not found or marked for deletion.
1374 * If found return lle read locked.
1376 static struct llentry *
1377 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1379 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1380 struct llentry *lle;
1382 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1383 KASSERT(l3addr->sa_family == AF_INET,
1384 ("sin_family %d", l3addr->sa_family));
1385 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1386 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1387 ("wrong lle request flags: %#x", flags));
1389 lle = in_lltable_find_dst(llt, sin->sin_addr);
1392 if (flags & LLE_UNLOCKED)
1395 if (flags & LLE_EXCLUSIVE)
1401 * If the afdata lock is not held, the LLE may have been unlinked while
1402 * we were blocked on the LLE lock. Check for this case.
1404 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1405 if (flags & LLE_EXCLUSIVE)
1415 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1416 struct sysctl_req *wr)
1418 struct ifnet *ifp = llt->llt_ifp;
1421 struct rt_msghdr rtm;
1422 struct sockaddr_in sin;
1423 struct sockaddr_dl sdl;
1425 struct sockaddr_dl *sdl;
1428 bzero(&arpc, sizeof(arpc));
1429 /* skip deleted entries */
1430 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1432 /* Skip if jailed and not a valid IP of the prison. */
1433 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1434 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1437 * produce a msg made of:
1439 * struct sockaddr_in; (IPv4)
1440 * struct sockaddr_dl;
1442 arpc.rtm.rtm_msglen = sizeof(arpc);
1443 arpc.rtm.rtm_version = RTM_VERSION;
1444 arpc.rtm.rtm_type = RTM_GET;
1445 arpc.rtm.rtm_flags = RTF_UP;
1446 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1449 if (lle->la_flags & LLE_PUB)
1450 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1453 sdl->sdl_family = AF_LINK;
1454 sdl->sdl_len = sizeof(*sdl);
1455 sdl->sdl_index = ifp->if_index;
1456 sdl->sdl_type = ifp->if_type;
1457 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1458 sdl->sdl_alen = ifp->if_addrlen;
1459 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1462 bzero(LLADDR(sdl), ifp->if_addrlen);
1465 arpc.rtm.rtm_rmx.rmx_expire =
1466 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1467 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1468 if (lle->la_flags & LLE_STATIC)
1469 arpc.rtm.rtm_flags |= RTF_STATIC;
1470 if (lle->la_flags & LLE_IFADDR)
1471 arpc.rtm.rtm_flags |= RTF_PINNED;
1472 arpc.rtm.rtm_index = ifp->if_index;
1473 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1478 static struct lltable *
1479 in_lltattach(struct ifnet *ifp)
1481 struct lltable *llt;
1483 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1484 llt->llt_af = AF_INET;
1487 llt->llt_lookup = in_lltable_lookup;
1488 llt->llt_alloc_entry = in_lltable_alloc;
1489 llt->llt_delete_entry = in_lltable_delete_entry;
1490 llt->llt_dump_entry = in_lltable_dump_entry;
1491 llt->llt_hash = in_lltable_hash;
1492 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1493 llt->llt_free_entry = in_lltable_free_entry;
1494 llt->llt_match_prefix = in_lltable_match_prefix;
1495 llt->llt_mark_used = in_lltable_mark_used;
1502 in_domifattach(struct ifnet *ifp)
1504 struct in_ifinfo *ii;
1506 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1508 ii->ii_llt = in_lltattach(ifp);
1509 ii->ii_igmp = igmp_domifattach(ifp);
1515 in_domifdetach(struct ifnet *ifp, void *aux)
1517 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1519 igmp_domifdetach(ifp);
1520 lltable_free(ii->ii_llt);