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 *);
75 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
77 static void in_socktrim(struct sockaddr_in *);
78 static void in_purgemaddrs(struct ifnet *);
80 VNET_DEFINE_STATIC(int, nosameprefix);
81 #define V_nosameprefix VNET(nosameprefix)
82 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
83 &VNET_NAME(nosameprefix), 0,
84 "Refuse to create same prefixes on different interfaces");
86 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
87 #define V_ripcbinfo VNET(ripcbinfo)
89 static struct sx in_control_sx;
90 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
93 * Return 1 if an internet address is for a ``local'' host
94 * (one to which we have a connection).
97 in_localaddr(struct in_addr in)
99 struct rm_priotracker in_ifa_tracker;
100 u_long i = ntohl(in.s_addr);
101 struct in_ifaddr *ia;
103 IN_IFADDR_RLOCK(&in_ifa_tracker);
104 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
105 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
106 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
110 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
115 * Return 1 if an internet address is for the local host and configured
116 * on one of its interfaces.
119 in_localip(struct in_addr in)
121 struct rm_priotracker in_ifa_tracker;
122 struct in_ifaddr *ia;
124 IN_IFADDR_RLOCK(&in_ifa_tracker);
125 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
126 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
127 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
131 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
136 * Return 1 if an internet address is configured on an interface.
139 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
142 struct in_ifaddr *ia;
146 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
147 if (ifa->ifa_addr->sa_family != AF_INET)
149 ia = (struct in_ifaddr *)ifa;
150 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
158 * Return a reference to the interface address which is different to
159 * the supplied one but with same IP address value.
161 static struct in_ifaddr *
162 in_localip_more(struct in_ifaddr *ia)
164 struct rm_priotracker in_ifa_tracker;
165 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
166 struct in_ifaddr *it;
168 IN_IFADDR_RLOCK(&in_ifa_tracker);
169 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
170 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
171 ifa_ref(&it->ia_ifa);
172 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
176 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
182 * Determine whether an IP address is in a reserved set of addresses
183 * that may not be forwarded, or whether datagrams to that destination
187 in_canforward(struct in_addr in)
189 u_long i = ntohl(in.s_addr);
191 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
192 IN_ZERONET(i) || IN_LOOPBACK(i))
198 * Trim a mask in a sockaddr
201 in_socktrim(struct sockaddr_in *ap)
203 char *cplim = (char *) &ap->sin_addr;
204 char *cp = (char *) (&ap->sin_addr + 1);
207 while (--cp >= cplim)
209 (ap)->sin_len = cp - (char *) (ap) + 1;
215 * Generic internet control operations (ioctl's).
218 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
221 struct ifreq *ifr = (struct ifreq *)data;
222 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
223 struct epoch_tracker et;
225 struct in_ifaddr *ia;
229 return (EADDRNOTAVAIL);
232 * Filter out 4 ioctls we implement directly. Forward the rest
233 * to specific functions and ifp->if_ioctl().
242 sx_xlock(&in_control_sx);
243 error = in_gifaddr_ioctl(cmd, data, ifp, td);
244 sx_xunlock(&in_control_sx);
247 sx_xlock(&in_control_sx);
248 error = in_difaddr_ioctl(cmd, data, ifp, td);
249 sx_xunlock(&in_control_sx);
251 case OSIOCAIFADDR: /* 9.x compat */
253 sx_xlock(&in_control_sx);
254 error = in_aifaddr_ioctl(cmd, data, ifp, td);
255 sx_xunlock(&in_control_sx);
261 /* We no longer support that old commands. */
264 if (ifp->if_ioctl == NULL)
266 return ((*ifp->if_ioctl)(ifp, cmd, data));
269 if (addr->sin_addr.s_addr != INADDR_ANY &&
270 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
271 return (EADDRNOTAVAIL);
274 * Find address for this interface, if it exists. If an
275 * address was specified, find that one instead of the
276 * first one on the interface, if possible.
279 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
280 if (ifa->ifa_addr->sa_family != AF_INET)
282 ia = (struct in_ifaddr *)ifa;
283 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
287 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
288 if (ifa->ifa_addr->sa_family == AF_INET) {
289 ia = (struct in_ifaddr *)ifa;
290 if (prison_check_ip4(td->td_ucred,
291 &ia->ia_addr.sin_addr) == 0)
297 return (EADDRNOTAVAIL);
307 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
311 *addr = ia->ia_broadaddr;
315 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
319 *addr = ia->ia_dstaddr;
323 *addr = ia->ia_sockmask;
333 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
335 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
336 const struct sockaddr_in *addr = &ifra->ifra_addr;
337 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
338 const struct sockaddr_in *mask = &ifra->ifra_mask;
339 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
340 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
341 struct epoch_tracker et;
343 struct in_ifaddr *ia;
347 error = priv_check(td, PRIV_NET_ADDIFADDR);
352 * ifra_addr must be present and be of INET family.
353 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
355 if (addr->sin_len != sizeof(struct sockaddr_in) ||
356 addr->sin_family != AF_INET)
358 if (broadaddr->sin_len != 0 &&
359 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
360 broadaddr->sin_family != AF_INET))
362 if (mask->sin_len != 0 &&
363 (mask->sin_len != sizeof(struct sockaddr_in) ||
364 mask->sin_family != AF_INET))
366 if ((ifp->if_flags & IFF_POINTOPOINT) &&
367 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
368 dstaddr->sin_addr.s_addr == INADDR_ANY))
369 return (EDESTADDRREQ);
370 if (vhid > 0 && carp_attach_p == NULL)
371 return (EPROTONOSUPPORT);
374 * See whether address already exist.
379 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
380 struct in_ifaddr *it;
382 if (ifa->ifa_addr->sa_family != AF_INET)
385 it = (struct in_ifaddr *)ifa;
386 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
387 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
395 (void )in_difaddr_ioctl(cmd, data, ifp, td);
397 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
398 ia = (struct in_ifaddr *)ifa;
399 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
400 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
401 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
402 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
403 CALLOUT_RETURNUNLOCKED);
407 if (mask->sin_len != 0) {
408 ia->ia_sockmask = *mask;
409 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
411 in_addr_t i = ntohl(addr->sin_addr.s_addr);
414 * Be compatible with network classes, if netmask isn't
415 * supplied, guess it based on classes.
418 ia->ia_subnetmask = IN_CLASSA_NET;
419 else if (IN_CLASSB(i))
420 ia->ia_subnetmask = IN_CLASSB_NET;
422 ia->ia_subnetmask = IN_CLASSC_NET;
423 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
425 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
426 in_socktrim(&ia->ia_sockmask);
428 if (ifp->if_flags & IFF_BROADCAST) {
429 if (broadaddr->sin_len != 0) {
430 ia->ia_broadaddr = *broadaddr;
431 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
432 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
433 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
434 ia->ia_broadaddr.sin_family = AF_INET;
436 ia->ia_broadaddr.sin_addr.s_addr =
437 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
438 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
439 ia->ia_broadaddr.sin_family = AF_INET;
443 if (ifp->if_flags & IFF_POINTOPOINT)
444 ia->ia_dstaddr = *dstaddr;
446 /* XXXGL: rtinit() needs this strange assignment. */
447 if (ifp->if_flags & IFF_LOOPBACK)
448 ia->ia_dstaddr = ia->ia_addr;
451 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
456 /* if_addrhead is already referenced by ifa_alloc() */
458 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
459 IF_ADDR_WUNLOCK(ifp);
461 ifa_ref(ifa); /* in_ifaddrhead */
463 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
464 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
468 * Give the interface a chance to initialize
469 * if this is its first address,
470 * and to validate the address if necessary.
472 if (ifp->if_ioctl != NULL) {
473 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
479 * Add route for the network.
484 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
487 error = in_addprefix(ia, flags);
493 * Add a loopback route to self.
495 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
496 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
497 !((ifp->if_flags & IFF_POINTOPOINT) &&
498 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
499 struct in_ifaddr *eia;
501 eia = in_localip_more(ia);
504 error = ifa_add_loopback_route((struct ifaddr *)ia,
505 (struct sockaddr *)&ia->ia_addr);
509 ifa_free(&eia->ia_ifa);
512 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
513 struct in_addr allhosts_addr;
514 struct in_ifinfo *ii;
516 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
517 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
519 error = in_joingroup(ifp, &allhosts_addr, NULL,
524 * Note: we don't need extra reference for ifa, since we called
525 * with sx lock held, and ifaddr can not be deleted in concurrent
528 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
534 (void )in_scrubprefix(ia, LLE_STATIC);
537 if (ia->ia_ifa.ifa_carp)
538 (*carp_detach_p)(&ia->ia_ifa, false);
541 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
542 IF_ADDR_WUNLOCK(ifp);
543 ifa_free(&ia->ia_ifa); /* if_addrhead */
546 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
547 LIST_REMOVE(ia, ia_hash);
549 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
555 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
557 const struct ifreq *ifr = (struct ifreq *)data;
558 const struct sockaddr_in *addr = (const struct sockaddr_in *)
561 struct in_ifaddr *ia;
562 bool deleteAny, iaIsLast;
566 error = priv_check(td, PRIV_NET_DELIFADDR);
571 if (addr->sin_len != sizeof(struct sockaddr_in) ||
572 addr->sin_family != AF_INET)
580 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
581 struct in_ifaddr *it;
583 if (ifa->ifa_addr->sa_family != AF_INET)
586 it = (struct in_ifaddr *)ifa;
587 if (deleteAny && ia == NULL && (td == NULL ||
588 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
591 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
592 (td == NULL || prison_check_ip4(td->td_ucred,
593 &addr->sin_addr) == 0))
601 IF_ADDR_WUNLOCK(ifp);
602 return (EADDRNOTAVAIL);
605 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
606 IF_ADDR_WUNLOCK(ifp);
607 ifa_free(&ia->ia_ifa); /* if_addrhead */
610 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
611 LIST_REMOVE(ia, ia_hash);
615 * in_scrubprefix() kills the interface route.
617 in_scrubprefix(ia, LLE_STATIC);
620 * in_ifadown gets rid of all the rest of
621 * the routes. This is not quite the right
622 * thing to do, but at least if we are running
623 * a routing process they will come back.
625 in_ifadown(&ia->ia_ifa, 1);
627 if (ia->ia_ifa.ifa_carp)
628 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
631 * If this is the last IPv4 address configured on this
632 * interface, leave the all-hosts group.
633 * No state-change report need be transmitted.
635 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
636 struct in_ifinfo *ii;
638 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
639 if (ii->ii_allhosts) {
640 (void)in_leavegroup(ii->ii_allhosts, NULL);
641 ii->ii_allhosts = NULL;
646 if (callout_stop(&ia->ia_garp_timer) == 1) {
647 ifa_free(&ia->ia_ifa);
649 IF_ADDR_WUNLOCK(ifp);
651 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
653 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
659 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
661 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
662 const struct sockaddr_in *addr = &ifra->ifra_addr;
663 struct epoch_tracker et;
665 struct in_ifaddr *ia;
668 * ifra_addr must be present and be of INET family.
670 if (addr->sin_len != sizeof(struct sockaddr_in) ||
671 addr->sin_family != AF_INET)
675 * See whether address exist.
679 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
680 struct in_ifaddr *it;
682 if (ifa->ifa_addr->sa_family != AF_INET)
685 it = (struct in_ifaddr *)ifa;
686 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
687 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
694 return (EADDRNOTAVAIL);
697 ifra->ifra_mask = ia->ia_sockmask;
698 if ((ifp->if_flags & IFF_POINTOPOINT) &&
699 ia->ia_dstaddr.sin_family == AF_INET)
700 ifra->ifra_dstaddr = ia->ia_dstaddr;
701 else if ((ifp->if_flags & IFF_BROADCAST) &&
702 ia->ia_broadaddr.sin_family == AF_INET)
703 ifra->ifra_broadaddr = ia->ia_broadaddr;
705 memset(&ifra->ifra_broadaddr, 0,
706 sizeof(ifra->ifra_broadaddr));
712 #define rtinitflags(x) \
713 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
717 * Check if we have a route for the given prefix already or add one accordingly.
720 in_addprefix(struct in_ifaddr *target, int flags)
722 struct rm_priotracker in_ifa_tracker;
723 struct in_ifaddr *ia;
724 struct in_addr prefix, mask, p, m;
727 if ((flags & RTF_HOST) != 0) {
728 prefix = target->ia_dstaddr.sin_addr;
731 prefix = target->ia_addr.sin_addr;
732 mask = target->ia_sockmask.sin_addr;
733 prefix.s_addr &= mask.s_addr;
736 IN_IFADDR_RLOCK(&in_ifa_tracker);
737 /* Look for an existing address with the same prefix, mask, and fib */
738 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
739 if (rtinitflags(ia)) {
740 p = ia->ia_dstaddr.sin_addr;
742 if (prefix.s_addr != p.s_addr)
745 p = ia->ia_addr.sin_addr;
746 m = ia->ia_sockmask.sin_addr;
747 p.s_addr &= m.s_addr;
749 if (prefix.s_addr != p.s_addr ||
750 mask.s_addr != m.s_addr)
753 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
757 * If we got a matching prefix route inserted by other
758 * interface address, we are done here.
760 if (ia->ia_flags & IFA_ROUTE) {
761 if (V_nosameprefix) {
762 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
767 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
768 target->ia_ifp->if_fib;
769 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
770 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
775 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
778 * No-one seem to have this prefix route, so we try to insert it.
780 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
782 target->ia_flags |= IFA_ROUTE;
787 * Removes either all lle entries for given @ia, or lle
788 * corresponding to @ia address.
791 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
793 struct sockaddr_in addr, mask;
794 struct sockaddr *saddr, *smask;
797 saddr = (struct sockaddr *)&addr;
798 bzero(&addr, sizeof(addr));
799 addr.sin_len = sizeof(addr);
800 addr.sin_family = AF_INET;
801 smask = (struct sockaddr *)&mask;
802 bzero(&mask, sizeof(mask));
803 mask.sin_len = sizeof(mask);
804 mask.sin_family = AF_INET;
805 mask.sin_addr.s_addr = ia->ia_subnetmask;
810 * Remove all L2 entries matching given prefix.
811 * Convert address to host representation to avoid
812 * doing this on every callback. ia_subnetmask is already
813 * stored in host representation.
815 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
816 lltable_prefix_free(AF_INET, saddr, smask, flags);
818 /* Remove interface address only */
819 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
820 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
825 * If there is no other address in the system that can serve a route to the
826 * same prefix, remove the route. Hand over the route to the new address
830 in_scrubprefix(struct in_ifaddr *target, u_int flags)
832 struct rm_priotracker in_ifa_tracker;
833 struct in_ifaddr *ia;
834 struct in_addr prefix, mask, p, m;
838 * Remove the loopback route to the interface address.
840 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
841 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
842 (flags & LLE_STATIC)) {
843 struct in_ifaddr *eia;
846 * XXXME: add fib-aware in_localip.
847 * We definitely don't want to switch between
848 * prefixes in different fibs.
850 eia = in_localip_more(target);
853 error = ifa_switch_loopback_route((struct ifaddr *)eia,
854 (struct sockaddr *)&target->ia_addr);
855 ifa_free(&eia->ia_ifa);
857 error = ifa_del_loopback_route((struct ifaddr *)target,
858 (struct sockaddr *)&target->ia_addr);
862 if (rtinitflags(target)) {
863 prefix = target->ia_dstaddr.sin_addr;
866 prefix = target->ia_addr.sin_addr;
867 mask = target->ia_sockmask.sin_addr;
868 prefix.s_addr &= mask.s_addr;
871 if ((target->ia_flags & IFA_ROUTE) == 0) {
874 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
875 target->ia_ifp->if_fib;
876 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
879 * Removing address from !IFF_UP interface or
880 * prefix which exists on other interface (along with route).
881 * No entries should exist here except target addr.
882 * Given that, delete this entry only.
884 in_scrubprefixlle(target, 0, flags);
888 IN_IFADDR_RLOCK(&in_ifa_tracker);
889 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
890 if (rtinitflags(ia)) {
891 p = ia->ia_dstaddr.sin_addr;
893 if (prefix.s_addr != p.s_addr)
896 p = ia->ia_addr.sin_addr;
897 m = ia->ia_sockmask.sin_addr;
898 p.s_addr &= m.s_addr;
900 if (prefix.s_addr != p.s_addr ||
901 mask.s_addr != m.s_addr)
905 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
909 * If we got a matching prefix address, move IFA_ROUTE and
910 * the route itself to it. Make sure that routing daemons
913 if ((ia->ia_flags & IFA_ROUTE) == 0) {
914 ifa_ref(&ia->ia_ifa);
915 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
916 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
917 rtinitflags(target));
919 target->ia_flags &= ~IFA_ROUTE;
921 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
923 /* Scrub all entries IFF interface is different */
924 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
926 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
927 rtinitflags(ia) | RTF_UP);
929 ia->ia_flags |= IFA_ROUTE;
931 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
933 ifa_free(&ia->ia_ifa);
937 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
940 * remove all L2 entries on the given prefix
942 in_scrubprefixlle(target, 1, flags);
945 * As no-one seem to have this prefix, we can remove the route.
947 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
949 target->ia_flags &= ~IFA_ROUTE;
951 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
961 struct ifaddr *ifa, *nifa;
962 struct ifaliasreq ifr;
965 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
966 /* Cannot lock here - lock recursion. */
967 /* NET_EPOCH_ENTER(et); */
968 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
969 if (ifa->ifa_addr->sa_family != AF_INET)
973 * This is ugly but the only way for legacy IP to
974 * cleanly remove addresses and everything attached.
976 bzero(&ifr, sizeof(ifr));
977 ifr.ifra_addr = *ifa->ifa_addr;
978 if (ifa->ifa_dstaddr)
979 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
980 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
983 /* NET_EPOCH_EXIT(et); */
985 igmp_domifdetach(ifp);
991 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
994 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
996 * Check for old-style (host 0) broadcast, but
997 * taking into account that RFC 3021 obsoletes it.
999 (ia->ia_subnetmask != IN_RFC3021_MASK &&
1000 ntohl(in.s_addr) == ia->ia_subnet)) &&
1002 * Check for an all one subnetmask. These
1003 * only exist when an interface gets a secondary
1006 ia->ia_subnetmask != (u_long)0xffffffff);
1010 * Return 1 if the address might be a local broadcast address.
1013 in_broadcast(struct in_addr in, struct ifnet *ifp)
1020 if (in.s_addr == INADDR_BROADCAST ||
1021 in.s_addr == INADDR_ANY)
1023 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1027 * Look through the list of addresses for a match
1028 * with a broadcast address.
1030 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1031 if (ifa->ifa_addr->sa_family == AF_INET &&
1032 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1040 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1043 in_ifdetach(struct ifnet *ifp)
1046 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1047 in_pcbpurgeif0(&V_udbinfo, ifp);
1048 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1049 in_purgemaddrs(ifp);
1053 * Make sure all multicast deletions invoking if_ioctl() are
1054 * completed before returning. Else we risk accessing a freed
1055 * ifnet structure pointer.
1057 inm_release_wait(NULL);
1061 * Delete all IPv4 multicast address records, and associated link-layer
1062 * multicast address records, associated with ifp.
1063 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1064 * XXX This should not race with ifma_protospec being set during
1065 * a new allocation, if it does, we have bigger problems.
1068 in_purgemaddrs(struct ifnet *ifp)
1070 struct in_multi_head purgeinms;
1071 struct in_multi *inm;
1072 struct ifmultiaddr *ifma, *next;
1074 SLIST_INIT(&purgeinms);
1075 IN_MULTI_LIST_LOCK();
1078 * Extract list of in_multi associated with the detaching ifp
1079 * which the PF_INET layer is about to release.
1080 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1081 * by code further down.
1085 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1086 if (ifma->ifma_addr->sa_family != AF_INET ||
1087 ifma->ifma_protospec == NULL)
1089 inm = (struct in_multi *)ifma->ifma_protospec;
1090 inm_rele_locked(&purgeinms, inm);
1091 if (__predict_false(ifma_restart)) {
1092 ifma_restart = true;
1096 IF_ADDR_WUNLOCK(ifp);
1098 inm_release_list_deferred(&purgeinms);
1100 IN_MULTI_LIST_UNLOCK();
1104 struct llentry base;
1107 #define IN_LLTBL_DEFAULT_HSIZE 32
1108 #define IN_LLTBL_HASH(k, h) \
1109 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1112 * Do actual deallocation of @lle.
1115 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1117 struct llentry *lle;
1119 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1120 LLE_LOCK_DESTROY(lle);
1121 LLE_REQ_DESTROY(lle);
1122 free(lle, M_LLTABLE);
1126 * Called by the datapath to indicate that
1127 * the entry was used.
1130 in_lltable_mark_used(struct llentry *lle)
1134 lle->r_skip_req = 0;
1135 LLE_REQ_UNLOCK(lle);
1139 * Called by LLE_FREE_LOCKED when number of references
1143 in_lltable_destroy_lle(struct llentry *lle)
1147 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1150 static struct llentry *
1151 in_lltable_new(struct in_addr addr4, u_int flags)
1153 struct in_llentry *lle;
1155 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1156 if (lle == NULL) /* NB: caller generates msg */
1160 * For IPv4 this will trigger "arpresolve" to generate
1163 lle->base.la_expire = time_uptime; /* mark expired */
1164 lle->base.r_l3addr.addr4 = addr4;
1165 lle->base.lle_refcnt = 1;
1166 lle->base.lle_free = in_lltable_destroy_lle;
1167 LLE_LOCK_INIT(&lle->base);
1168 LLE_REQ_INIT(&lle->base);
1169 callout_init(&lle->base.lle_timer, 1);
1171 return (&lle->base);
1174 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1175 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1178 in_lltable_match_prefix(const struct sockaddr *saddr,
1179 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1181 struct in_addr addr, mask, lle_addr;
1183 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1184 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1185 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1187 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1190 if (lle->la_flags & LLE_IFADDR) {
1192 * Delete LLE_IFADDR records IFF address & flag matches.
1193 * Note that addr is the interface address within prefix
1195 * Note also we should handle 'ifdown' cases without removing
1198 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1203 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1204 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1211 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1213 size_t pkts_dropped;
1215 LLE_WLOCK_ASSERT(lle);
1216 KASSERT(llt != NULL, ("lltable is NULL"));
1218 /* Unlink entry from table if not already */
1219 if ((lle->la_flags & LLE_LINKED) != 0) {
1220 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1221 lltable_unlink_entry(llt, lle);
1224 /* Drop hold queue */
1225 pkts_dropped = llentry_free(lle);
1226 ARPSTAT_ADD(dropped, pkts_dropped);
1230 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1232 struct rt_addrinfo info;
1233 struct sockaddr_in rt_key, rt_mask;
1234 struct sockaddr rt_gateway;
1237 KASSERT(l3addr->sa_family == AF_INET,
1238 ("sin_family %d", l3addr->sa_family));
1240 bzero(&rt_key, sizeof(rt_key));
1241 rt_key.sin_len = sizeof(rt_key);
1242 bzero(&rt_mask, sizeof(rt_mask));
1243 rt_mask.sin_len = sizeof(rt_mask);
1244 bzero(&rt_gateway, sizeof(rt_gateway));
1245 rt_gateway.sa_len = sizeof(rt_gateway);
1247 bzero(&info, sizeof(info));
1248 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1249 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
1250 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
1252 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
1255 rt_flags = info.rti_flags;
1258 * If the gateway for an existing host route matches the target L3
1259 * address, which is a special route inserted by some implementation
1260 * such as MANET, and the interface is of the correct type, then
1261 * allow for ARP to proceed.
1263 if (rt_flags & RTF_GATEWAY) {
1264 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
1265 info.rti_ifp->if_type != IFT_ETHER ||
1266 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1267 memcmp(rt_gateway.sa_data, l3addr->sa_data,
1268 sizeof(in_addr_t)) != 0) {
1269 rib_free_info(&info);
1273 rib_free_info(&info);
1276 * Make sure that at least the destination address is covered
1277 * by the route. This is for handling the case where 2 or more
1278 * interfaces have the same prefix. An incoming packet arrives
1279 * on one interface and the corresponding outgoing packet leaves
1280 * another interface.
1282 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
1283 const char *sa, *mask, *addr, *lim;
1284 const struct sockaddr_in *l3sin;
1286 mask = (const char *)&rt_mask;
1288 * Just being extra cautious to avoid some custom
1289 * code getting into trouble.
1291 if ((info.rti_addrs & RTA_NETMASK) == 0)
1294 sa = (const char *)&rt_key;
1295 addr = (const char *)l3addr;
1296 l3sin = (const struct sockaddr_in *)l3addr;
1297 lim = addr + l3sin->sin_len;
1299 for ( ; addr < lim; sa++, mask++, addr++) {
1300 if ((*sa ^ *addr) & *mask) {
1302 char addrbuf[INET_ADDRSTRLEN];
1304 log(LOG_INFO, "IPv4 address: \"%s\" "
1305 "is not on the network\n",
1306 inet_ntoa_r(l3sin->sin_addr, addrbuf));
1316 static inline uint32_t
1317 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1320 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1324 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1327 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1331 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1333 struct sockaddr_in *sin;
1335 sin = (struct sockaddr_in *)sa;
1336 bzero(sin, sizeof(*sin));
1337 sin->sin_family = AF_INET;
1338 sin->sin_len = sizeof(*sin);
1339 sin->sin_addr = lle->r_l3addr.addr4;
1342 static inline struct llentry *
1343 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1345 struct llentry *lle;
1346 struct llentries *lleh;
1349 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1350 lleh = &llt->lle_head[hashidx];
1351 CK_LIST_FOREACH(lle, lleh, lle_next) {
1352 if (lle->la_flags & LLE_DELETED)
1354 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1362 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1365 lle->la_flags |= LLE_DELETED;
1366 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1368 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1373 static struct llentry *
1374 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1376 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1377 struct ifnet *ifp = llt->llt_ifp;
1378 struct llentry *lle;
1379 char linkhdr[LLE_MAX_LINKHDR];
1383 KASSERT(l3addr->sa_family == AF_INET,
1384 ("sin_family %d", l3addr->sa_family));
1387 * A route that covers the given address must have
1388 * been installed 1st because we are doing a resolution,
1391 if (!(flags & LLE_IFADDR) &&
1392 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1395 lle = in_lltable_new(sin->sin_addr, flags);
1397 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1400 lle->la_flags = flags;
1401 if (flags & LLE_STATIC)
1402 lle->r_flags |= RLLE_VALID;
1403 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1404 linkhdrsize = LLE_MAX_LINKHDR;
1405 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1406 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1407 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1410 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1412 lle->la_flags |= LLE_STATIC;
1413 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1420 * Return NULL if not found or marked for deletion.
1421 * If found return lle read locked.
1423 static struct llentry *
1424 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1426 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1427 struct llentry *lle;
1429 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1430 KASSERT(l3addr->sa_family == AF_INET,
1431 ("sin_family %d", l3addr->sa_family));
1432 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1433 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1434 ("wrong lle request flags: %#x", flags));
1436 lle = in_lltable_find_dst(llt, sin->sin_addr);
1439 if (flags & LLE_UNLOCKED)
1442 if (flags & LLE_EXCLUSIVE)
1448 * If the afdata lock is not held, the LLE may have been unlinked while
1449 * we were blocked on the LLE lock. Check for this case.
1451 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1452 if (flags & LLE_EXCLUSIVE)
1462 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1463 struct sysctl_req *wr)
1465 struct ifnet *ifp = llt->llt_ifp;
1468 struct rt_msghdr rtm;
1469 struct sockaddr_in sin;
1470 struct sockaddr_dl sdl;
1472 struct sockaddr_dl *sdl;
1475 bzero(&arpc, sizeof(arpc));
1476 /* skip deleted entries */
1477 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1479 /* Skip if jailed and not a valid IP of the prison. */
1480 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1481 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1484 * produce a msg made of:
1486 * struct sockaddr_in; (IPv4)
1487 * struct sockaddr_dl;
1489 arpc.rtm.rtm_msglen = sizeof(arpc);
1490 arpc.rtm.rtm_version = RTM_VERSION;
1491 arpc.rtm.rtm_type = RTM_GET;
1492 arpc.rtm.rtm_flags = RTF_UP;
1493 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1496 if (lle->la_flags & LLE_PUB)
1497 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1500 sdl->sdl_family = AF_LINK;
1501 sdl->sdl_len = sizeof(*sdl);
1502 sdl->sdl_index = ifp->if_index;
1503 sdl->sdl_type = ifp->if_type;
1504 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1505 sdl->sdl_alen = ifp->if_addrlen;
1506 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1509 bzero(LLADDR(sdl), ifp->if_addrlen);
1512 arpc.rtm.rtm_rmx.rmx_expire =
1513 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1514 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1515 if (lle->la_flags & LLE_STATIC)
1516 arpc.rtm.rtm_flags |= RTF_STATIC;
1517 if (lle->la_flags & LLE_IFADDR)
1518 arpc.rtm.rtm_flags |= RTF_PINNED;
1519 arpc.rtm.rtm_index = ifp->if_index;
1520 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1525 static struct lltable *
1526 in_lltattach(struct ifnet *ifp)
1528 struct lltable *llt;
1530 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1531 llt->llt_af = AF_INET;
1534 llt->llt_lookup = in_lltable_lookup;
1535 llt->llt_alloc_entry = in_lltable_alloc;
1536 llt->llt_delete_entry = in_lltable_delete_entry;
1537 llt->llt_dump_entry = in_lltable_dump_entry;
1538 llt->llt_hash = in_lltable_hash;
1539 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1540 llt->llt_free_entry = in_lltable_free_entry;
1541 llt->llt_match_prefix = in_lltable_match_prefix;
1542 llt->llt_mark_used = in_lltable_mark_used;
1549 in_domifattach(struct ifnet *ifp)
1551 struct in_ifinfo *ii;
1553 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1555 ii->ii_llt = in_lltattach(ifp);
1556 ii->ii_igmp = igmp_domifattach(ifp);
1562 in_domifdetach(struct ifnet *ifp, void *aux)
1564 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1566 igmp_domifdetach(ifp);
1567 lltable_free(ii->ii_llt);