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>
63 #include <netinet/if_ether.h>
64 #include <netinet/in.h>
65 #include <netinet/in_var.h>
66 #include <netinet/in_pcb.h>
67 #include <netinet/ip_var.h>
68 #include <netinet/ip_carp.h>
69 #include <netinet/igmp_var.h>
70 #include <netinet/udp.h>
71 #include <netinet/udp_var.h>
73 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
74 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
76 static void in_socktrim(struct sockaddr_in *);
77 static void in_purgemaddrs(struct ifnet *);
79 VNET_DEFINE_STATIC(int, nosameprefix);
80 #define V_nosameprefix VNET(nosameprefix)
81 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
82 &VNET_NAME(nosameprefix), 0,
83 "Refuse to create same prefixes on different interfaces");
85 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
86 #define V_ripcbinfo VNET(ripcbinfo)
88 static struct sx in_control_sx;
89 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
92 * Return 1 if an internet address is for a ``local'' host
93 * (one to which we have a connection).
96 in_localaddr(struct in_addr in)
98 struct rm_priotracker in_ifa_tracker;
99 u_long i = ntohl(in.s_addr);
100 struct in_ifaddr *ia;
102 IN_IFADDR_RLOCK(&in_ifa_tracker);
103 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
104 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
105 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
109 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
114 * Return 1 if an internet address is for the local host and configured
115 * on one of its interfaces.
118 in_localip(struct in_addr in)
120 struct rm_priotracker in_ifa_tracker;
121 struct in_ifaddr *ia;
123 IN_IFADDR_RLOCK(&in_ifa_tracker);
124 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
125 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
126 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
130 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
135 * Return 1 if an internet address is configured on an interface.
138 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
141 struct in_ifaddr *ia;
145 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
146 if (ifa->ifa_addr->sa_family != AF_INET)
148 ia = (struct in_ifaddr *)ifa;
149 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
157 * Return a reference to the interface address which is different to
158 * the supplied one but with same IP address value.
160 static struct in_ifaddr *
161 in_localip_more(struct in_ifaddr *ia)
163 struct rm_priotracker in_ifa_tracker;
164 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
165 struct in_ifaddr *it;
167 IN_IFADDR_RLOCK(&in_ifa_tracker);
168 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
169 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
170 ifa_ref(&it->ia_ifa);
171 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
175 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
181 * Determine whether an IP address is in a reserved set of addresses
182 * that may not be forwarded, or whether datagrams to that destination
186 in_canforward(struct in_addr in)
188 u_long i = ntohl(in.s_addr);
190 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
191 IN_ZERONET(i) || IN_LOOPBACK(i))
197 * Trim a mask in a sockaddr
200 in_socktrim(struct sockaddr_in *ap)
202 char *cplim = (char *) &ap->sin_addr;
203 char *cp = (char *) (&ap->sin_addr + 1);
206 while (--cp >= cplim)
208 (ap)->sin_len = cp - (char *) (ap) + 1;
214 * Generic internet control operations (ioctl's).
217 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
220 struct ifreq *ifr = (struct ifreq *)data;
221 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
222 struct epoch_tracker et;
224 struct in_ifaddr *ia;
228 return (EADDRNOTAVAIL);
231 * Filter out 4 ioctls we implement directly. Forward the rest
232 * to specific functions and ifp->if_ioctl().
241 sx_xlock(&in_control_sx);
242 error = in_difaddr_ioctl(cmd, data, ifp, td);
243 sx_xunlock(&in_control_sx);
245 case OSIOCAIFADDR: /* 9.x compat */
247 sx_xlock(&in_control_sx);
248 error = in_aifaddr_ioctl(cmd, data, ifp, td);
249 sx_xunlock(&in_control_sx);
255 /* We no longer support that old commands. */
258 if (ifp->if_ioctl == NULL)
260 return ((*ifp->if_ioctl)(ifp, cmd, data));
263 if (addr->sin_addr.s_addr != INADDR_ANY &&
264 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
265 return (EADDRNOTAVAIL);
268 * Find address for this interface, if it exists. If an
269 * address was specified, find that one instead of the
270 * first one on the interface, if possible.
273 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
274 if (ifa->ifa_addr->sa_family != AF_INET)
276 ia = (struct in_ifaddr *)ifa;
277 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
281 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
282 if (ifa->ifa_addr->sa_family == AF_INET) {
283 ia = (struct in_ifaddr *)ifa;
284 if (prison_check_ip4(td->td_ucred,
285 &ia->ia_addr.sin_addr) == 0)
291 return (EADDRNOTAVAIL);
301 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
305 *addr = ia->ia_broadaddr;
309 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
313 *addr = ia->ia_dstaddr;
317 *addr = ia->ia_sockmask;
327 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
329 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
330 const struct sockaddr_in *addr = &ifra->ifra_addr;
331 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
332 const struct sockaddr_in *mask = &ifra->ifra_mask;
333 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
334 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
335 struct epoch_tracker et;
337 struct in_ifaddr *ia;
341 error = priv_check(td, PRIV_NET_ADDIFADDR);
346 * ifra_addr must be present and be of INET family.
347 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
349 if (addr->sin_len != sizeof(struct sockaddr_in) ||
350 addr->sin_family != AF_INET)
352 if (broadaddr->sin_len != 0 &&
353 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
354 broadaddr->sin_family != AF_INET))
356 if (mask->sin_len != 0 &&
357 (mask->sin_len != sizeof(struct sockaddr_in) ||
358 mask->sin_family != AF_INET))
360 if ((ifp->if_flags & IFF_POINTOPOINT) &&
361 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
362 dstaddr->sin_addr.s_addr == INADDR_ANY))
363 return (EDESTADDRREQ);
364 if (vhid > 0 && carp_attach_p == NULL)
365 return (EPROTONOSUPPORT);
368 * See whether address already exist.
373 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
374 struct in_ifaddr *it;
376 if (ifa->ifa_addr->sa_family != AF_INET)
379 it = (struct in_ifaddr *)ifa;
381 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
382 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
388 (void )in_difaddr_ioctl(cmd, data, ifp, td);
390 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
391 ia = (struct in_ifaddr *)ifa;
392 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
393 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
394 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
395 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
396 CALLOUT_RETURNUNLOCKED);
400 if (mask->sin_len != 0) {
401 ia->ia_sockmask = *mask;
402 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
404 in_addr_t i = ntohl(addr->sin_addr.s_addr);
407 * Be compatible with network classes, if netmask isn't
408 * supplied, guess it based on classes.
411 ia->ia_subnetmask = IN_CLASSA_NET;
412 else if (IN_CLASSB(i))
413 ia->ia_subnetmask = IN_CLASSB_NET;
415 ia->ia_subnetmask = IN_CLASSC_NET;
416 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
418 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
419 in_socktrim(&ia->ia_sockmask);
421 if (ifp->if_flags & IFF_BROADCAST) {
422 if (broadaddr->sin_len != 0) {
423 ia->ia_broadaddr = *broadaddr;
424 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
425 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
426 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
427 ia->ia_broadaddr.sin_family = AF_INET;
429 ia->ia_broadaddr.sin_addr.s_addr =
430 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
431 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
432 ia->ia_broadaddr.sin_family = AF_INET;
436 if (ifp->if_flags & IFF_POINTOPOINT)
437 ia->ia_dstaddr = *dstaddr;
439 /* XXXGL: rtinit() needs this strange assignment. */
440 if (ifp->if_flags & IFF_LOOPBACK)
441 ia->ia_dstaddr = ia->ia_addr;
444 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
449 /* if_addrhead is already referenced by ifa_alloc() */
451 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
452 IF_ADDR_WUNLOCK(ifp);
454 ifa_ref(ifa); /* in_ifaddrhead */
456 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
457 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
461 * Give the interface a chance to initialize
462 * if this is its first address,
463 * and to validate the address if necessary.
465 if (ifp->if_ioctl != NULL) {
466 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
472 * Add route for the network.
477 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
480 error = in_addprefix(ia, flags);
486 * Add a loopback route to self.
488 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
489 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
490 !((ifp->if_flags & IFF_POINTOPOINT) &&
491 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
492 struct in_ifaddr *eia;
494 eia = in_localip_more(ia);
497 error = ifa_add_loopback_route((struct ifaddr *)ia,
498 (struct sockaddr *)&ia->ia_addr);
502 ifa_free(&eia->ia_ifa);
505 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
506 struct in_addr allhosts_addr;
507 struct in_ifinfo *ii;
509 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
510 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
512 error = in_joingroup(ifp, &allhosts_addr, NULL,
517 * Note: we don't need extra reference for ifa, since we called
518 * with sx lock held, and ifaddr can not be deleted in concurrent
521 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
527 (void )in_scrubprefix(ia, LLE_STATIC);
530 if (ia->ia_ifa.ifa_carp)
531 (*carp_detach_p)(&ia->ia_ifa, false);
534 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
535 IF_ADDR_WUNLOCK(ifp);
536 ifa_free(&ia->ia_ifa); /* if_addrhead */
539 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
540 LIST_REMOVE(ia, ia_hash);
542 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
548 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
550 const struct ifreq *ifr = (struct ifreq *)data;
551 const struct sockaddr_in *addr = (const struct sockaddr_in *)
554 struct in_ifaddr *ia;
555 bool deleteAny, iaIsLast;
559 error = priv_check(td, PRIV_NET_DELIFADDR);
564 if (addr->sin_len != sizeof(struct sockaddr_in) ||
565 addr->sin_family != AF_INET)
573 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
574 struct in_ifaddr *it;
576 if (ifa->ifa_addr->sa_family != AF_INET)
579 it = (struct in_ifaddr *)ifa;
580 if (deleteAny && ia == NULL && (td == NULL ||
581 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
584 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
585 (td == NULL || prison_check_ip4(td->td_ucred,
586 &addr->sin_addr) == 0))
594 IF_ADDR_WUNLOCK(ifp);
595 return (EADDRNOTAVAIL);
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 */
603 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
604 LIST_REMOVE(ia, ia_hash);
608 * in_scrubprefix() kills the interface route.
610 in_scrubprefix(ia, LLE_STATIC);
613 * in_ifadown gets rid of all the rest of
614 * the routes. This is not quite the right
615 * thing to do, but at least if we are running
616 * a routing process they will come back.
618 in_ifadown(&ia->ia_ifa, 1);
620 if (ia->ia_ifa.ifa_carp)
621 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
624 * If this is the last IPv4 address configured on this
625 * interface, leave the all-hosts group.
626 * No state-change report need be transmitted.
628 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
629 struct in_ifinfo *ii;
631 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
632 if (ii->ii_allhosts) {
633 (void)in_leavegroup(ii->ii_allhosts, NULL);
634 ii->ii_allhosts = NULL;
639 if (callout_stop(&ia->ia_garp_timer) == 1) {
640 ifa_free(&ia->ia_ifa);
642 IF_ADDR_WUNLOCK(ifp);
644 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
646 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
651 #define rtinitflags(x) \
652 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
656 * Check if we have a route for the given prefix already or add one accordingly.
659 in_addprefix(struct in_ifaddr *target, int flags)
661 struct rm_priotracker in_ifa_tracker;
662 struct in_ifaddr *ia;
663 struct in_addr prefix, mask, p, m;
666 if ((flags & RTF_HOST) != 0) {
667 prefix = target->ia_dstaddr.sin_addr;
670 prefix = target->ia_addr.sin_addr;
671 mask = target->ia_sockmask.sin_addr;
672 prefix.s_addr &= mask.s_addr;
675 IN_IFADDR_RLOCK(&in_ifa_tracker);
676 /* Look for an existing address with the same prefix, mask, and fib */
677 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
678 if (rtinitflags(ia)) {
679 p = ia->ia_dstaddr.sin_addr;
681 if (prefix.s_addr != p.s_addr)
684 p = ia->ia_addr.sin_addr;
685 m = ia->ia_sockmask.sin_addr;
686 p.s_addr &= m.s_addr;
688 if (prefix.s_addr != p.s_addr ||
689 mask.s_addr != m.s_addr)
692 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
696 * If we got a matching prefix route inserted by other
697 * interface address, we are done here.
699 if (ia->ia_flags & IFA_ROUTE) {
700 if (V_nosameprefix) {
701 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
706 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
707 target->ia_ifp->if_fib;
708 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
709 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
714 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
717 * No-one seem to have this prefix route, so we try to insert it.
719 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
721 target->ia_flags |= IFA_ROUTE;
726 * Removes either all lle entries for given @ia, or lle
727 * corresponding to @ia address.
730 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
732 struct sockaddr_in addr, mask;
733 struct sockaddr *saddr, *smask;
736 saddr = (struct sockaddr *)&addr;
737 bzero(&addr, sizeof(addr));
738 addr.sin_len = sizeof(addr);
739 addr.sin_family = AF_INET;
740 smask = (struct sockaddr *)&mask;
741 bzero(&mask, sizeof(mask));
742 mask.sin_len = sizeof(mask);
743 mask.sin_family = AF_INET;
744 mask.sin_addr.s_addr = ia->ia_subnetmask;
749 * Remove all L2 entries matching given prefix.
750 * Convert address to host representation to avoid
751 * doing this on every callback. ia_subnetmask is already
752 * stored in host representation.
754 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
755 lltable_prefix_free(AF_INET, saddr, smask, flags);
757 /* Remove interface address only */
758 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
759 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
764 * If there is no other address in the system that can serve a route to the
765 * same prefix, remove the route. Hand over the route to the new address
769 in_scrubprefix(struct in_ifaddr *target, u_int flags)
771 struct rm_priotracker in_ifa_tracker;
772 struct in_ifaddr *ia;
773 struct in_addr prefix, mask, p, m;
777 * Remove the loopback route to the interface address.
779 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
780 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
781 (flags & LLE_STATIC)) {
782 struct in_ifaddr *eia;
785 * XXXME: add fib-aware in_localip.
786 * We definitely don't want to switch between
787 * prefixes in different fibs.
789 eia = in_localip_more(target);
792 error = ifa_switch_loopback_route((struct ifaddr *)eia,
793 (struct sockaddr *)&target->ia_addr);
794 ifa_free(&eia->ia_ifa);
796 error = ifa_del_loopback_route((struct ifaddr *)target,
797 (struct sockaddr *)&target->ia_addr);
801 if (rtinitflags(target)) {
802 prefix = target->ia_dstaddr.sin_addr;
805 prefix = target->ia_addr.sin_addr;
806 mask = target->ia_sockmask.sin_addr;
807 prefix.s_addr &= mask.s_addr;
810 if ((target->ia_flags & IFA_ROUTE) == 0) {
813 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
814 target->ia_ifp->if_fib;
815 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
818 * Removing address from !IFF_UP interface or
819 * prefix which exists on other interface (along with route).
820 * No entries should exist here except target addr.
821 * Given that, delete this entry only.
823 in_scrubprefixlle(target, 0, flags);
827 IN_IFADDR_RLOCK(&in_ifa_tracker);
828 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
829 if (rtinitflags(ia)) {
830 p = ia->ia_dstaddr.sin_addr;
832 if (prefix.s_addr != p.s_addr)
835 p = ia->ia_addr.sin_addr;
836 m = ia->ia_sockmask.sin_addr;
837 p.s_addr &= m.s_addr;
839 if (prefix.s_addr != p.s_addr ||
840 mask.s_addr != m.s_addr)
844 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
848 * If we got a matching prefix address, move IFA_ROUTE and
849 * the route itself to it. Make sure that routing daemons
852 if ((ia->ia_flags & IFA_ROUTE) == 0) {
853 ifa_ref(&ia->ia_ifa);
854 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
855 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
856 rtinitflags(target));
858 target->ia_flags &= ~IFA_ROUTE;
860 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
862 /* Scrub all entries IFF interface is different */
863 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
865 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
866 rtinitflags(ia) | RTF_UP);
868 ia->ia_flags |= IFA_ROUTE;
870 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
872 ifa_free(&ia->ia_ifa);
876 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
879 * remove all L2 entries on the given prefix
881 in_scrubprefixlle(target, 1, flags);
884 * As no-one seem to have this prefix, we can remove the route.
886 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
888 target->ia_flags &= ~IFA_ROUTE;
890 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
900 struct ifaddr *ifa, *nifa;
901 struct ifaliasreq ifr;
904 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
905 /* Cannot lock here - lock recursion. */
906 /* NET_EPOCH_ENTER(et); */
907 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
908 if (ifa->ifa_addr->sa_family != AF_INET)
912 * This is ugly but the only way for legacy IP to
913 * cleanly remove addresses and everything attached.
915 bzero(&ifr, sizeof(ifr));
916 ifr.ifra_addr = *ifa->ifa_addr;
917 if (ifa->ifa_dstaddr)
918 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
919 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
922 /* NET_EPOCH_EXIT(et); */
924 igmp_domifdetach(ifp);
930 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
933 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
935 * Check for old-style (host 0) broadcast, but
936 * taking into account that RFC 3021 obsoletes it.
938 (ia->ia_subnetmask != IN_RFC3021_MASK &&
939 ntohl(in.s_addr) == ia->ia_subnet)) &&
941 * Check for an all one subnetmask. These
942 * only exist when an interface gets a secondary
945 ia->ia_subnetmask != (u_long)0xffffffff);
949 * Return 1 if the address might be a local broadcast address.
952 in_broadcast(struct in_addr in, struct ifnet *ifp)
959 if (in.s_addr == INADDR_BROADCAST ||
960 in.s_addr == INADDR_ANY)
962 if ((ifp->if_flags & IFF_BROADCAST) == 0)
966 * Look through the list of addresses for a match
967 * with a broadcast address.
969 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
970 if (ifa->ifa_addr->sa_family == AF_INET &&
971 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
979 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
982 in_ifdetach(struct ifnet *ifp)
985 in_pcbpurgeif0(&V_ripcbinfo, ifp);
986 in_pcbpurgeif0(&V_udbinfo, ifp);
987 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
992 * Make sure all multicast deletions invoking if_ioctl() are
993 * completed before returning. Else we risk accessing a freed
994 * ifnet structure pointer.
996 inm_release_wait(NULL);
1000 * Delete all IPv4 multicast address records, and associated link-layer
1001 * multicast address records, associated with ifp.
1002 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1003 * XXX This should not race with ifma_protospec being set during
1004 * a new allocation, if it does, we have bigger problems.
1007 in_purgemaddrs(struct ifnet *ifp)
1009 struct in_multi_head purgeinms;
1010 struct in_multi *inm;
1011 struct ifmultiaddr *ifma, *next;
1013 SLIST_INIT(&purgeinms);
1014 IN_MULTI_LIST_LOCK();
1017 * Extract list of in_multi associated with the detaching ifp
1018 * which the PF_INET layer is about to release.
1019 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1020 * by code further down.
1024 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1025 if (ifma->ifma_addr->sa_family != AF_INET ||
1026 ifma->ifma_protospec == NULL)
1028 inm = (struct in_multi *)ifma->ifma_protospec;
1029 inm_rele_locked(&purgeinms, inm);
1030 if (__predict_false(ifma_restart)) {
1031 ifma_restart = true;
1035 IF_ADDR_WUNLOCK(ifp);
1037 inm_release_list_deferred(&purgeinms);
1039 IN_MULTI_LIST_UNLOCK();
1043 struct llentry base;
1046 #define IN_LLTBL_DEFAULT_HSIZE 32
1047 #define IN_LLTBL_HASH(k, h) \
1048 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1051 * Do actual deallocation of @lle.
1054 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1056 struct llentry *lle;
1058 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1059 LLE_LOCK_DESTROY(lle);
1060 LLE_REQ_DESTROY(lle);
1061 free(lle, M_LLTABLE);
1065 * Called by the datapath to indicate that
1066 * the entry was used.
1069 in_lltable_mark_used(struct llentry *lle)
1073 lle->r_skip_req = 0;
1074 LLE_REQ_UNLOCK(lle);
1078 * Called by LLE_FREE_LOCKED when number of references
1082 in_lltable_destroy_lle(struct llentry *lle)
1086 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1089 static struct llentry *
1090 in_lltable_new(struct in_addr addr4, u_int flags)
1092 struct in_llentry *lle;
1094 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1095 if (lle == NULL) /* NB: caller generates msg */
1099 * For IPv4 this will trigger "arpresolve" to generate
1102 lle->base.la_expire = time_uptime; /* mark expired */
1103 lle->base.r_l3addr.addr4 = addr4;
1104 lle->base.lle_refcnt = 1;
1105 lle->base.lle_free = in_lltable_destroy_lle;
1106 LLE_LOCK_INIT(&lle->base);
1107 LLE_REQ_INIT(&lle->base);
1108 callout_init(&lle->base.lle_timer, 1);
1110 return (&lle->base);
1113 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1114 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1117 in_lltable_match_prefix(const struct sockaddr *saddr,
1118 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1120 struct in_addr addr, mask, lle_addr;
1122 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1123 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1124 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1126 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1129 if (lle->la_flags & LLE_IFADDR) {
1131 * Delete LLE_IFADDR records IFF address & flag matches.
1132 * Note that addr is the interface address within prefix
1134 * Note also we should handle 'ifdown' cases without removing
1137 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1142 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1143 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1150 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1152 size_t pkts_dropped;
1154 LLE_WLOCK_ASSERT(lle);
1155 KASSERT(llt != NULL, ("lltable is NULL"));
1157 /* Unlink entry from table if not already */
1158 if ((lle->la_flags & LLE_LINKED) != 0) {
1159 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1160 lltable_unlink_entry(llt, lle);
1163 /* Drop hold queue */
1164 pkts_dropped = llentry_free(lle);
1165 ARPSTAT_ADD(dropped, pkts_dropped);
1169 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1171 struct rt_addrinfo info;
1172 struct sockaddr_in rt_key, rt_mask;
1173 struct sockaddr rt_gateway;
1176 KASSERT(l3addr->sa_family == AF_INET,
1177 ("sin_family %d", l3addr->sa_family));
1179 bzero(&rt_key, sizeof(rt_key));
1180 rt_key.sin_len = sizeof(rt_key);
1181 bzero(&rt_mask, sizeof(rt_mask));
1182 rt_mask.sin_len = sizeof(rt_mask);
1183 bzero(&rt_gateway, sizeof(rt_gateway));
1184 rt_gateway.sa_len = sizeof(rt_gateway);
1186 bzero(&info, sizeof(info));
1187 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1188 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
1189 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
1191 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
1194 rt_flags = info.rti_flags;
1197 * If the gateway for an existing host route matches the target L3
1198 * address, which is a special route inserted by some implementation
1199 * such as MANET, and the interface is of the correct type, then
1200 * allow for ARP to proceed.
1202 if (rt_flags & RTF_GATEWAY) {
1203 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
1204 info.rti_ifp->if_type != IFT_ETHER ||
1205 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1206 memcmp(rt_gateway.sa_data, l3addr->sa_data,
1207 sizeof(in_addr_t)) != 0) {
1208 rib_free_info(&info);
1212 rib_free_info(&info);
1215 * Make sure that at least the destination address is covered
1216 * by the route. This is for handling the case where 2 or more
1217 * interfaces have the same prefix. An incoming packet arrives
1218 * on one interface and the corresponding outgoing packet leaves
1219 * another interface.
1221 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
1222 const char *sa, *mask, *addr, *lim;
1223 const struct sockaddr_in *l3sin;
1225 mask = (const char *)&rt_mask;
1227 * Just being extra cautious to avoid some custom
1228 * code getting into trouble.
1230 if ((info.rti_addrs & RTA_NETMASK) == 0)
1233 sa = (const char *)&rt_key;
1234 addr = (const char *)l3addr;
1235 l3sin = (const struct sockaddr_in *)l3addr;
1236 lim = addr + l3sin->sin_len;
1238 for ( ; addr < lim; sa++, mask++, addr++) {
1239 if ((*sa ^ *addr) & *mask) {
1241 char addrbuf[INET_ADDRSTRLEN];
1243 log(LOG_INFO, "IPv4 address: \"%s\" "
1244 "is not on the network\n",
1245 inet_ntoa_r(l3sin->sin_addr, addrbuf));
1255 static inline uint32_t
1256 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1259 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1263 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1266 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1270 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1272 struct sockaddr_in *sin;
1274 sin = (struct sockaddr_in *)sa;
1275 bzero(sin, sizeof(*sin));
1276 sin->sin_family = AF_INET;
1277 sin->sin_len = sizeof(*sin);
1278 sin->sin_addr = lle->r_l3addr.addr4;
1281 static inline struct llentry *
1282 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1284 struct llentry *lle;
1285 struct llentries *lleh;
1288 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1289 lleh = &llt->lle_head[hashidx];
1290 CK_LIST_FOREACH(lle, lleh, lle_next) {
1291 if (lle->la_flags & LLE_DELETED)
1293 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1301 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1304 lle->la_flags |= LLE_DELETED;
1305 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1307 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1312 static struct llentry *
1313 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1315 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1316 struct ifnet *ifp = llt->llt_ifp;
1317 struct llentry *lle;
1318 char linkhdr[LLE_MAX_LINKHDR];
1322 KASSERT(l3addr->sa_family == AF_INET,
1323 ("sin_family %d", l3addr->sa_family));
1326 * A route that covers the given address must have
1327 * been installed 1st because we are doing a resolution,
1330 if (!(flags & LLE_IFADDR) &&
1331 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1334 lle = in_lltable_new(sin->sin_addr, flags);
1336 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1339 lle->la_flags = flags;
1340 if (flags & LLE_STATIC)
1341 lle->r_flags |= RLLE_VALID;
1342 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1343 linkhdrsize = LLE_MAX_LINKHDR;
1344 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1345 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1346 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1349 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1351 lle->la_flags |= LLE_STATIC;
1352 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1359 * Return NULL if not found or marked for deletion.
1360 * If found return lle read locked.
1362 static struct llentry *
1363 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1365 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1366 struct llentry *lle;
1368 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1369 KASSERT(l3addr->sa_family == AF_INET,
1370 ("sin_family %d", l3addr->sa_family));
1371 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1372 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1373 ("wrong lle request flags: %#x", flags));
1375 lle = in_lltable_find_dst(llt, sin->sin_addr);
1378 if (flags & LLE_UNLOCKED)
1381 if (flags & LLE_EXCLUSIVE)
1387 * If the afdata lock is not held, the LLE may have been unlinked while
1388 * we were blocked on the LLE lock. Check for this case.
1390 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1391 if (flags & LLE_EXCLUSIVE)
1401 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1402 struct sysctl_req *wr)
1404 struct ifnet *ifp = llt->llt_ifp;
1407 struct rt_msghdr rtm;
1408 struct sockaddr_in sin;
1409 struct sockaddr_dl sdl;
1411 struct sockaddr_dl *sdl;
1414 bzero(&arpc, sizeof(arpc));
1415 /* skip deleted entries */
1416 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1418 /* Skip if jailed and not a valid IP of the prison. */
1419 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1420 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1423 * produce a msg made of:
1425 * struct sockaddr_in; (IPv4)
1426 * struct sockaddr_dl;
1428 arpc.rtm.rtm_msglen = sizeof(arpc);
1429 arpc.rtm.rtm_version = RTM_VERSION;
1430 arpc.rtm.rtm_type = RTM_GET;
1431 arpc.rtm.rtm_flags = RTF_UP;
1432 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1435 if (lle->la_flags & LLE_PUB)
1436 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1439 sdl->sdl_family = AF_LINK;
1440 sdl->sdl_len = sizeof(*sdl);
1441 sdl->sdl_index = ifp->if_index;
1442 sdl->sdl_type = ifp->if_type;
1443 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1444 sdl->sdl_alen = ifp->if_addrlen;
1445 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1448 bzero(LLADDR(sdl), ifp->if_addrlen);
1451 arpc.rtm.rtm_rmx.rmx_expire =
1452 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1453 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1454 if (lle->la_flags & LLE_STATIC)
1455 arpc.rtm.rtm_flags |= RTF_STATIC;
1456 if (lle->la_flags & LLE_IFADDR)
1457 arpc.rtm.rtm_flags |= RTF_PINNED;
1458 arpc.rtm.rtm_index = ifp->if_index;
1459 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1464 static struct lltable *
1465 in_lltattach(struct ifnet *ifp)
1467 struct lltable *llt;
1469 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1470 llt->llt_af = AF_INET;
1473 llt->llt_lookup = in_lltable_lookup;
1474 llt->llt_alloc_entry = in_lltable_alloc;
1475 llt->llt_delete_entry = in_lltable_delete_entry;
1476 llt->llt_dump_entry = in_lltable_dump_entry;
1477 llt->llt_hash = in_lltable_hash;
1478 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1479 llt->llt_free_entry = in_lltable_free_entry;
1480 llt->llt_match_prefix = in_lltable_match_prefix;
1481 llt->llt_mark_used = in_lltable_mark_used;
1488 in_domifattach(struct ifnet *ifp)
1490 struct in_ifinfo *ii;
1492 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1494 ii->ii_llt = in_lltattach(ifp);
1495 ii->ii_igmp = igmp_domifattach(ifp);
1501 in_domifdetach(struct ifnet *ifp, void *aux)
1503 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1505 igmp_domifdetach(ifp);
1506 lltable_free(ii->ii_llt);