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)
143 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)
159 * Return a reference to the interface address which is different to
160 * the supplied one but with same IP address value.
162 static struct in_ifaddr *
163 in_localip_more(struct in_ifaddr *ia)
165 struct rm_priotracker in_ifa_tracker;
166 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
167 struct in_ifaddr *it;
169 IN_IFADDR_RLOCK(&in_ifa_tracker);
170 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
171 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
172 ifa_ref(&it->ia_ifa);
173 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
177 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
183 * Determine whether an IP address is in a reserved set of addresses
184 * that may not be forwarded, or whether datagrams to that destination
188 in_canforward(struct in_addr in)
190 u_long i = ntohl(in.s_addr);
192 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
193 IN_ZERONET(i) || IN_LOOPBACK(i))
199 * Trim a mask in a sockaddr
202 in_socktrim(struct sockaddr_in *ap)
204 char *cplim = (char *) &ap->sin_addr;
205 char *cp = (char *) (&ap->sin_addr + 1);
208 while (--cp >= cplim)
210 (ap)->sin_len = cp - (char *) (ap) + 1;
216 * Generic internet control operations (ioctl's).
219 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
222 struct ifreq *ifr = (struct ifreq *)data;
223 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
224 struct epoch_tracker et;
226 struct in_ifaddr *ia;
230 return (EADDRNOTAVAIL);
233 * Filter out 4 ioctls we implement directly. Forward the rest
234 * to specific functions and ifp->if_ioctl().
243 sx_xlock(&in_control_sx);
244 error = in_difaddr_ioctl(cmd, data, ifp, td);
245 sx_xunlock(&in_control_sx);
247 case OSIOCAIFADDR: /* 9.x compat */
249 sx_xlock(&in_control_sx);
250 error = in_aifaddr_ioctl(cmd, data, ifp, td);
251 sx_xunlock(&in_control_sx);
257 /* We no longer support that old commands. */
260 if (ifp->if_ioctl == NULL)
262 return ((*ifp->if_ioctl)(ifp, cmd, data));
265 if (addr->sin_addr.s_addr != INADDR_ANY &&
266 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
267 return (EADDRNOTAVAIL);
270 * Find address for this interface, if it exists. If an
271 * address was specified, find that one instead of the
272 * first one on the interface, if possible.
275 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
276 if (ifa->ifa_addr->sa_family != AF_INET)
278 ia = (struct in_ifaddr *)ifa;
279 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
283 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
284 if (ifa->ifa_addr->sa_family == AF_INET) {
285 ia = (struct in_ifaddr *)ifa;
286 if (prison_check_ip4(td->td_ucred,
287 &ia->ia_addr.sin_addr) == 0)
293 return (EADDRNOTAVAIL);
303 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
307 *addr = ia->ia_broadaddr;
311 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
315 *addr = ia->ia_dstaddr;
319 *addr = ia->ia_sockmask;
329 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
331 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
332 const struct sockaddr_in *addr = &ifra->ifra_addr;
333 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
334 const struct sockaddr_in *mask = &ifra->ifra_mask;
335 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
336 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
337 struct epoch_tracker et;
339 struct in_ifaddr *ia;
343 error = priv_check(td, PRIV_NET_ADDIFADDR);
348 * ifra_addr must be present and be of INET family.
349 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
351 if (addr->sin_len != sizeof(struct sockaddr_in) ||
352 addr->sin_family != AF_INET)
354 if (broadaddr->sin_len != 0 &&
355 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
356 broadaddr->sin_family != AF_INET))
358 if (mask->sin_len != 0 &&
359 (mask->sin_len != sizeof(struct sockaddr_in) ||
360 mask->sin_family != AF_INET))
362 if ((ifp->if_flags & IFF_POINTOPOINT) &&
363 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
364 dstaddr->sin_addr.s_addr == INADDR_ANY))
365 return (EDESTADDRREQ);
366 if (vhid > 0 && carp_attach_p == NULL)
367 return (EPROTONOSUPPORT);
370 * See whether address already exist.
375 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
376 struct in_ifaddr *it;
378 if (ifa->ifa_addr->sa_family != AF_INET)
381 it = (struct in_ifaddr *)ifa;
383 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
384 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
390 (void )in_difaddr_ioctl(cmd, data, ifp, td);
392 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
393 ia = (struct in_ifaddr *)ifa;
394 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
395 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
396 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
397 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
398 CALLOUT_RETURNUNLOCKED);
402 if (mask->sin_len != 0) {
403 ia->ia_sockmask = *mask;
404 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
406 in_addr_t i = ntohl(addr->sin_addr.s_addr);
409 * Be compatible with network classes, if netmask isn't
410 * supplied, guess it based on classes.
413 ia->ia_subnetmask = IN_CLASSA_NET;
414 else if (IN_CLASSB(i))
415 ia->ia_subnetmask = IN_CLASSB_NET;
417 ia->ia_subnetmask = IN_CLASSC_NET;
418 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
420 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
421 in_socktrim(&ia->ia_sockmask);
423 if (ifp->if_flags & IFF_BROADCAST) {
424 if (broadaddr->sin_len != 0) {
425 ia->ia_broadaddr = *broadaddr;
426 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
427 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
428 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
429 ia->ia_broadaddr.sin_family = AF_INET;
431 ia->ia_broadaddr.sin_addr.s_addr =
432 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
433 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
434 ia->ia_broadaddr.sin_family = AF_INET;
438 if (ifp->if_flags & IFF_POINTOPOINT)
439 ia->ia_dstaddr = *dstaddr;
441 /* XXXGL: rtinit() needs this strange assignment. */
442 if (ifp->if_flags & IFF_LOOPBACK)
443 ia->ia_dstaddr = ia->ia_addr;
446 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
451 /* if_addrhead is already referenced by ifa_alloc() */
453 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
454 IF_ADDR_WUNLOCK(ifp);
456 ifa_ref(ifa); /* in_ifaddrhead */
458 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
459 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
463 * Give the interface a chance to initialize
464 * if this is its first address,
465 * and to validate the address if necessary.
467 if (ifp->if_ioctl != NULL) {
468 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
474 * Add route for the network.
479 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
482 error = in_addprefix(ia, flags);
488 * Add a loopback route to self.
490 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
491 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
492 !((ifp->if_flags & IFF_POINTOPOINT) &&
493 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
494 struct in_ifaddr *eia;
496 eia = in_localip_more(ia);
499 error = ifa_add_loopback_route((struct ifaddr *)ia,
500 (struct sockaddr *)&ia->ia_addr);
504 ifa_free(&eia->ia_ifa);
507 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
508 struct in_addr allhosts_addr;
509 struct in_ifinfo *ii;
511 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
512 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
514 error = in_joingroup(ifp, &allhosts_addr, NULL,
519 * Note: we don't need extra reference for ifa, since we called
520 * with sx lock held, and ifaddr can not be deleted in concurrent
523 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
529 (void )in_scrubprefix(ia, LLE_STATIC);
532 if (ia->ia_ifa.ifa_carp)
533 (*carp_detach_p)(&ia->ia_ifa, false);
536 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
537 IF_ADDR_WUNLOCK(ifp);
538 ifa_free(&ia->ia_ifa); /* if_addrhead */
541 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
542 LIST_REMOVE(ia, ia_hash);
544 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
550 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
552 const struct ifreq *ifr = (struct ifreq *)data;
553 const struct sockaddr_in *addr = (const struct sockaddr_in *)
556 struct in_ifaddr *ia;
557 bool deleteAny, iaIsLast;
561 error = priv_check(td, PRIV_NET_DELIFADDR);
566 if (addr->sin_len != sizeof(struct sockaddr_in) ||
567 addr->sin_family != AF_INET)
575 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
576 struct in_ifaddr *it;
578 if (ifa->ifa_addr->sa_family != AF_INET)
581 it = (struct in_ifaddr *)ifa;
582 if (deleteAny && ia == NULL && (td == NULL ||
583 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
586 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
587 (td == NULL || prison_check_ip4(td->td_ucred,
588 &addr->sin_addr) == 0))
596 IF_ADDR_WUNLOCK(ifp);
597 return (EADDRNOTAVAIL);
600 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
601 IF_ADDR_WUNLOCK(ifp);
602 ifa_free(&ia->ia_ifa); /* if_addrhead */
605 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
606 LIST_REMOVE(ia, ia_hash);
610 * in_scrubprefix() kills the interface route.
612 in_scrubprefix(ia, LLE_STATIC);
615 * in_ifadown gets rid of all the rest of
616 * the routes. This is not quite the right
617 * thing to do, but at least if we are running
618 * a routing process they will come back.
620 in_ifadown(&ia->ia_ifa, 1);
622 if (ia->ia_ifa.ifa_carp)
623 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
626 * If this is the last IPv4 address configured on this
627 * interface, leave the all-hosts group.
628 * No state-change report need be transmitted.
630 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
631 struct in_ifinfo *ii;
633 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
634 if (ii->ii_allhosts) {
635 (void)in_leavegroup(ii->ii_allhosts, NULL);
636 ii->ii_allhosts = NULL;
641 if (callout_stop(&ia->ia_garp_timer) == 1) {
642 ifa_free(&ia->ia_ifa);
644 IF_ADDR_WUNLOCK(ifp);
646 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
648 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
653 #define rtinitflags(x) \
654 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
658 * Check if we have a route for the given prefix already or add one accordingly.
661 in_addprefix(struct in_ifaddr *target, int flags)
663 struct rm_priotracker in_ifa_tracker;
664 struct in_ifaddr *ia;
665 struct in_addr prefix, mask, p, m;
668 if ((flags & RTF_HOST) != 0) {
669 prefix = target->ia_dstaddr.sin_addr;
672 prefix = target->ia_addr.sin_addr;
673 mask = target->ia_sockmask.sin_addr;
674 prefix.s_addr &= mask.s_addr;
677 IN_IFADDR_RLOCK(&in_ifa_tracker);
678 /* Look for an existing address with the same prefix, mask, and fib */
679 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
680 if (rtinitflags(ia)) {
681 p = ia->ia_dstaddr.sin_addr;
683 if (prefix.s_addr != p.s_addr)
686 p = ia->ia_addr.sin_addr;
687 m = ia->ia_sockmask.sin_addr;
688 p.s_addr &= m.s_addr;
690 if (prefix.s_addr != p.s_addr ||
691 mask.s_addr != m.s_addr)
694 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
698 * If we got a matching prefix route inserted by other
699 * interface address, we are done here.
701 if (ia->ia_flags & IFA_ROUTE) {
703 if (ia->ia_addr.sin_addr.s_addr ==
704 target->ia_addr.sin_addr.s_addr) {
705 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
710 if (V_nosameprefix) {
711 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
716 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
717 target->ia_ifp->if_fib;
718 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
719 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
724 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
727 * No-one seem to have this prefix route, so we try to insert it.
729 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
731 target->ia_flags |= IFA_ROUTE;
736 * Removes either all lle entries for given @ia, or lle
737 * corresponding to @ia address.
740 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
742 struct sockaddr_in addr, mask;
743 struct sockaddr *saddr, *smask;
746 saddr = (struct sockaddr *)&addr;
747 bzero(&addr, sizeof(addr));
748 addr.sin_len = sizeof(addr);
749 addr.sin_family = AF_INET;
750 smask = (struct sockaddr *)&mask;
751 bzero(&mask, sizeof(mask));
752 mask.sin_len = sizeof(mask);
753 mask.sin_family = AF_INET;
754 mask.sin_addr.s_addr = ia->ia_subnetmask;
760 * Remove all L2 entries matching given prefix.
761 * Convert address to host representation to avoid
762 * doing this on every callback. ia_subnetmask is already
763 * stored in host representation.
765 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
766 lltable_prefix_free(AF_INET, saddr, smask, flags);
768 /* Remove interface address only */
769 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
770 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
775 * If there is no other address in the system that can serve a route to the
776 * same prefix, remove the route. Hand over the route to the new address
780 in_scrubprefix(struct in_ifaddr *target, u_int flags)
782 struct rm_priotracker in_ifa_tracker;
783 struct in_ifaddr *ia;
784 struct in_addr prefix, mask, p, m;
788 * Remove the loopback route to the interface address.
790 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
791 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
792 (flags & LLE_STATIC)) {
793 struct in_ifaddr *eia;
796 * XXXME: add fib-aware in_localip.
797 * We definitely don't want to switch between
798 * prefixes in different fibs.
800 eia = in_localip_more(target);
803 error = ifa_switch_loopback_route((struct ifaddr *)eia,
804 (struct sockaddr *)&target->ia_addr);
805 ifa_free(&eia->ia_ifa);
807 error = ifa_del_loopback_route((struct ifaddr *)target,
808 (struct sockaddr *)&target->ia_addr);
812 if (rtinitflags(target)) {
813 prefix = target->ia_dstaddr.sin_addr;
816 prefix = target->ia_addr.sin_addr;
817 mask = target->ia_sockmask.sin_addr;
818 prefix.s_addr &= mask.s_addr;
821 if ((target->ia_flags & IFA_ROUTE) == 0) {
824 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
825 target->ia_ifp->if_fib;
826 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
829 * Removing address from !IFF_UP interface or
830 * prefix which exists on other interface (along with route).
831 * No entries should exist here except target addr.
832 * Given that, delete this entry only.
834 in_scrubprefixlle(target, 0, flags);
838 IN_IFADDR_RLOCK(&in_ifa_tracker);
839 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
840 if (rtinitflags(ia)) {
841 p = ia->ia_dstaddr.sin_addr;
843 if (prefix.s_addr != p.s_addr)
846 p = ia->ia_addr.sin_addr;
847 m = ia->ia_sockmask.sin_addr;
848 p.s_addr &= m.s_addr;
850 if (prefix.s_addr != p.s_addr ||
851 mask.s_addr != m.s_addr)
855 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
859 * If we got a matching prefix address, move IFA_ROUTE and
860 * the route itself to it. Make sure that routing daemons
863 if ((ia->ia_flags & IFA_ROUTE) == 0) {
864 ifa_ref(&ia->ia_ifa);
865 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
866 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
867 rtinitflags(target));
869 target->ia_flags &= ~IFA_ROUTE;
871 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
873 /* Scrub all entries IFF interface is different */
874 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
876 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
877 rtinitflags(ia) | RTF_UP);
879 ia->ia_flags |= IFA_ROUTE;
881 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
883 ifa_free(&ia->ia_ifa);
887 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
890 * remove all L2 entries on the given prefix
892 in_scrubprefixlle(target, 1, flags);
895 * As no-one seem to have this prefix, we can remove the route.
897 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
899 target->ia_flags &= ~IFA_ROUTE;
901 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
911 struct ifaddr *ifa, *nifa;
912 struct ifaliasreq ifr;
915 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
916 /* Cannot lock here - lock recursion. */
917 /* NET_EPOCH_ENTER(et); */
918 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
919 if (ifa->ifa_addr->sa_family != AF_INET)
923 * This is ugly but the only way for legacy IP to
924 * cleanly remove addresses and everything attached.
926 bzero(&ifr, sizeof(ifr));
927 ifr.ifra_addr = *ifa->ifa_addr;
928 if (ifa->ifa_dstaddr)
929 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
930 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
933 /* NET_EPOCH_EXIT(et); */
935 igmp_domifdetach(ifp);
941 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
944 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
946 * Check for old-style (host 0) broadcast, but
947 * taking into account that RFC 3021 obsoletes it.
949 (ia->ia_subnetmask != IN_RFC3021_MASK &&
950 ntohl(in.s_addr) == ia->ia_subnet)) &&
952 * Check for an all one subnetmask. These
953 * only exist when an interface gets a secondary
956 ia->ia_subnetmask != (u_long)0xffffffff);
960 * Return 1 if the address might be a local broadcast address.
963 in_broadcast(struct in_addr in, struct ifnet *ifp)
970 if (in.s_addr == INADDR_BROADCAST ||
971 in.s_addr == INADDR_ANY)
973 if ((ifp->if_flags & IFF_BROADCAST) == 0)
977 * Look through the list of addresses for a match
978 * with a broadcast address.
980 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
981 if (ifa->ifa_addr->sa_family == AF_INET &&
982 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
990 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
993 in_ifdetach(struct ifnet *ifp)
996 in_pcbpurgeif0(&V_ripcbinfo, ifp);
997 in_pcbpurgeif0(&V_udbinfo, ifp);
998 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1004 * Delete all IPv4 multicast address records, and associated link-layer
1005 * multicast address records, associated with ifp.
1006 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1007 * XXX This should not race with ifma_protospec being set during
1008 * a new allocation, if it does, we have bigger problems.
1011 in_purgemaddrs(struct ifnet *ifp)
1013 struct in_multi_head purgeinms;
1014 struct in_multi *inm;
1015 struct ifmultiaddr *ifma, *next;
1017 SLIST_INIT(&purgeinms);
1018 IN_MULTI_LIST_LOCK();
1021 * Extract list of in_multi associated with the detaching ifp
1022 * which the PF_INET layer is about to release.
1023 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1024 * by code further down.
1028 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
1029 if (ifma->ifma_addr->sa_family != AF_INET ||
1030 ifma->ifma_protospec == NULL)
1032 inm = (struct in_multi *)ifma->ifma_protospec;
1033 inm_rele_locked(&purgeinms, inm);
1034 if (__predict_false(ifma_restart)) {
1035 ifma_restart = true;
1039 IF_ADDR_WUNLOCK(ifp);
1041 inm_release_list_deferred(&purgeinms);
1043 IN_MULTI_LIST_UNLOCK();
1047 struct llentry base;
1050 #define IN_LLTBL_DEFAULT_HSIZE 32
1051 #define IN_LLTBL_HASH(k, h) \
1052 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1055 * Do actual deallocation of @lle.
1058 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1060 struct llentry *lle;
1062 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1063 LLE_LOCK_DESTROY(lle);
1064 LLE_REQ_DESTROY(lle);
1065 free(lle, M_LLTABLE);
1069 * Called by the datapath to indicate that
1070 * the entry was used.
1073 in_lltable_mark_used(struct llentry *lle)
1077 lle->r_skip_req = 0;
1078 LLE_REQ_UNLOCK(lle);
1082 * Called by LLE_FREE_LOCKED when number of references
1086 in_lltable_destroy_lle(struct llentry *lle)
1090 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1093 static struct llentry *
1094 in_lltable_new(struct in_addr addr4, u_int flags)
1096 struct in_llentry *lle;
1098 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1099 if (lle == NULL) /* NB: caller generates msg */
1103 * For IPv4 this will trigger "arpresolve" to generate
1106 lle->base.la_expire = time_uptime; /* mark expired */
1107 lle->base.r_l3addr.addr4 = addr4;
1108 lle->base.lle_refcnt = 1;
1109 lle->base.lle_free = in_lltable_destroy_lle;
1110 LLE_LOCK_INIT(&lle->base);
1111 LLE_REQ_INIT(&lle->base);
1112 callout_init(&lle->base.lle_timer, 1);
1114 return (&lle->base);
1117 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1118 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1121 in_lltable_match_prefix(const struct sockaddr *saddr,
1122 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1124 struct in_addr addr, mask, lle_addr;
1126 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1127 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1128 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1130 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1133 if (lle->la_flags & LLE_IFADDR) {
1136 * Delete LLE_IFADDR records IFF address & flag matches.
1137 * Note that addr is the interface address within prefix
1139 * Note also we should handle 'ifdown' cases without removing
1142 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1147 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1148 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1155 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1157 size_t pkts_dropped;
1159 LLE_WLOCK_ASSERT(lle);
1160 KASSERT(llt != NULL, ("lltable is NULL"));
1162 /* Unlink entry from table if not already */
1163 if ((lle->la_flags & LLE_LINKED) != 0) {
1164 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1165 lltable_unlink_entry(llt, lle);
1168 /* Drop hold queue */
1169 pkts_dropped = llentry_free(lle);
1170 ARPSTAT_ADD(dropped, pkts_dropped);
1174 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1176 struct rt_addrinfo info;
1177 struct sockaddr_in rt_key, rt_mask;
1178 struct sockaddr rt_gateway;
1181 KASSERT(l3addr->sa_family == AF_INET,
1182 ("sin_family %d", l3addr->sa_family));
1184 bzero(&rt_key, sizeof(rt_key));
1185 rt_key.sin_len = sizeof(rt_key);
1186 bzero(&rt_mask, sizeof(rt_mask));
1187 rt_mask.sin_len = sizeof(rt_mask);
1188 bzero(&rt_gateway, sizeof(rt_gateway));
1189 rt_gateway.sa_len = sizeof(rt_gateway);
1191 bzero(&info, sizeof(info));
1192 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1193 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
1194 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
1196 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
1199 rt_flags = info.rti_flags;
1202 * If the gateway for an existing host route matches the target L3
1203 * address, which is a special route inserted by some implementation
1204 * such as MANET, and the interface is of the correct type, then
1205 * allow for ARP to proceed.
1207 if (rt_flags & RTF_GATEWAY) {
1208 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
1209 info.rti_ifp->if_type != IFT_ETHER ||
1210 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1211 memcmp(rt_gateway.sa_data, l3addr->sa_data,
1212 sizeof(in_addr_t)) != 0) {
1213 rib_free_info(&info);
1217 rib_free_info(&info);
1220 * Make sure that at least the destination address is covered
1221 * by the route. This is for handling the case where 2 or more
1222 * interfaces have the same prefix. An incoming packet arrives
1223 * on one interface and the corresponding outgoing packet leaves
1224 * another interface.
1226 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
1227 const char *sa, *mask, *addr, *lim;
1228 const struct sockaddr_in *l3sin;
1230 mask = (const char *)&rt_mask;
1232 * Just being extra cautious to avoid some custom
1233 * code getting into trouble.
1235 if ((info.rti_addrs & RTA_NETMASK) == 0)
1238 sa = (const char *)&rt_key;
1239 addr = (const char *)l3addr;
1240 l3sin = (const struct sockaddr_in *)l3addr;
1241 lim = addr + l3sin->sin_len;
1243 for ( ; addr < lim; sa++, mask++, addr++) {
1244 if ((*sa ^ *addr) & *mask) {
1246 char addrbuf[INET_ADDRSTRLEN];
1248 log(LOG_INFO, "IPv4 address: \"%s\" "
1249 "is not on the network\n",
1250 inet_ntoa_r(l3sin->sin_addr, addrbuf));
1260 static inline uint32_t
1261 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1264 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1268 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1271 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1275 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1277 struct sockaddr_in *sin;
1279 sin = (struct sockaddr_in *)sa;
1280 bzero(sin, sizeof(*sin));
1281 sin->sin_family = AF_INET;
1282 sin->sin_len = sizeof(*sin);
1283 sin->sin_addr = lle->r_l3addr.addr4;
1286 static inline struct llentry *
1287 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1289 struct llentry *lle;
1290 struct llentries *lleh;
1293 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1294 lleh = &llt->lle_head[hashidx];
1295 CK_LIST_FOREACH(lle, lleh, lle_next) {
1296 if (lle->la_flags & LLE_DELETED)
1298 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1306 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1309 lle->la_flags |= LLE_DELETED;
1310 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1312 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1317 static struct llentry *
1318 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1320 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1321 struct ifnet *ifp = llt->llt_ifp;
1322 struct llentry *lle;
1323 char linkhdr[LLE_MAX_LINKHDR];
1327 KASSERT(l3addr->sa_family == AF_INET,
1328 ("sin_family %d", l3addr->sa_family));
1331 * A route that covers the given address must have
1332 * been installed 1st because we are doing a resolution,
1335 if (!(flags & LLE_IFADDR) &&
1336 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1339 lle = in_lltable_new(sin->sin_addr, flags);
1341 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1344 lle->la_flags = flags;
1345 if (flags & LLE_STATIC)
1346 lle->r_flags |= RLLE_VALID;
1347 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1348 linkhdrsize = LLE_MAX_LINKHDR;
1349 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1350 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1351 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1354 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1356 lle->la_flags |= LLE_STATIC;
1357 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1364 * Return NULL if not found or marked for deletion.
1365 * If found return lle read locked.
1367 static struct llentry *
1368 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1370 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1371 struct llentry *lle;
1373 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1374 KASSERT(l3addr->sa_family == AF_INET,
1375 ("sin_family %d", l3addr->sa_family));
1376 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1377 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1378 ("wrong lle request flags: %#x", flags));
1380 lle = in_lltable_find_dst(llt, sin->sin_addr);
1383 if (flags & LLE_UNLOCKED)
1386 if (flags & LLE_EXCLUSIVE)
1392 * If the afdata lock is not held, the LLE may have been unlinked while
1393 * we were blocked on the LLE lock. Check for this case.
1395 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1396 if (flags & LLE_EXCLUSIVE)
1406 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1407 struct sysctl_req *wr)
1409 struct ifnet *ifp = llt->llt_ifp;
1412 struct rt_msghdr rtm;
1413 struct sockaddr_in sin;
1414 struct sockaddr_dl sdl;
1416 struct sockaddr_dl *sdl;
1419 bzero(&arpc, sizeof(arpc));
1420 /* skip deleted entries */
1421 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1423 /* Skip if jailed and not a valid IP of the prison. */
1424 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1425 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1428 * produce a msg made of:
1430 * struct sockaddr_in; (IPv4)
1431 * struct sockaddr_dl;
1433 arpc.rtm.rtm_msglen = sizeof(arpc);
1434 arpc.rtm.rtm_version = RTM_VERSION;
1435 arpc.rtm.rtm_type = RTM_GET;
1436 arpc.rtm.rtm_flags = RTF_UP;
1437 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1440 if (lle->la_flags & LLE_PUB)
1441 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1444 sdl->sdl_family = AF_LINK;
1445 sdl->sdl_len = sizeof(*sdl);
1446 sdl->sdl_index = ifp->if_index;
1447 sdl->sdl_type = ifp->if_type;
1448 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1449 sdl->sdl_alen = ifp->if_addrlen;
1450 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1453 bzero(LLADDR(sdl), ifp->if_addrlen);
1456 arpc.rtm.rtm_rmx.rmx_expire =
1457 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1458 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1459 if (lle->la_flags & LLE_STATIC)
1460 arpc.rtm.rtm_flags |= RTF_STATIC;
1461 if (lle->la_flags & LLE_IFADDR)
1462 arpc.rtm.rtm_flags |= RTF_PINNED;
1463 arpc.rtm.rtm_index = ifp->if_index;
1464 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1469 static struct lltable *
1470 in_lltattach(struct ifnet *ifp)
1472 struct lltable *llt;
1474 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1475 llt->llt_af = AF_INET;
1478 llt->llt_lookup = in_lltable_lookup;
1479 llt->llt_alloc_entry = in_lltable_alloc;
1480 llt->llt_delete_entry = in_lltable_delete_entry;
1481 llt->llt_dump_entry = in_lltable_dump_entry;
1482 llt->llt_hash = in_lltable_hash;
1483 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1484 llt->llt_free_entry = in_lltable_free_entry;
1485 llt->llt_match_prefix = in_lltable_match_prefix;
1486 llt->llt_mark_used = in_lltable_mark_used;
1493 in_domifattach(struct ifnet *ifp)
1495 struct in_ifinfo *ii;
1497 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1499 ii->ii_llt = in_lltattach(ifp);
1500 ii->ii_igmp = igmp_domifattach(ifp);
1506 in_domifdetach(struct ifnet *ifp, void *aux)
1508 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1510 igmp_domifdetach(ifp);
1511 lltable_free(ii->ii_llt);