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>
38 #define IN_HISTORICAL_NETS /* include class masks */
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/sysctl.h>
52 #include <sys/syslog.h>
56 #include <net/if_var.h>
57 #include <net/if_arp.h>
58 #include <net/if_dl.h>
59 #include <net/if_llatbl.h>
60 #include <net/if_private.h>
61 #include <net/if_types.h>
62 #include <net/route.h>
63 #include <net/route/nhop.h>
64 #include <net/route/route_ctl.h>
67 #include <netinet/if_ether.h>
68 #include <netinet/in.h>
69 #include <netinet/in_fib.h>
70 #include <netinet/in_var.h>
71 #include <netinet/in_pcb.h>
72 #include <netinet/ip_var.h>
73 #include <netinet/ip_carp.h>
74 #include <netinet/igmp_var.h>
75 #include <netinet/udp.h>
76 #include <netinet/udp_var.h>
79 #include <security/mac/mac_framework.h>
82 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
83 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
84 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
86 static void in_socktrim(struct sockaddr_in *);
87 static void in_purgemaddrs(struct ifnet *);
89 static bool ia_need_loopback_route(const struct in_ifaddr *);
91 VNET_DEFINE_STATIC(int, nosameprefix);
92 #define V_nosameprefix VNET(nosameprefix)
93 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
94 &VNET_NAME(nosameprefix), 0,
95 "Refuse to create same prefixes on different interfaces");
97 VNET_DEFINE_STATIC(bool, broadcast_lowest);
98 #define V_broadcast_lowest VNET(broadcast_lowest)
99 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
100 &VNET_NAME(broadcast_lowest), 0,
101 "Treat lowest address on a subnet (host 0) as broadcast");
103 VNET_DEFINE(bool, ip_allow_net240) = false;
104 #define V_ip_allow_net240 VNET(ip_allow_net240)
105 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net240,
106 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net240), 0,
107 "Allow use of Experimental addresses, aka Class E (240/4)");
108 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240 */
110 VNET_DEFINE(bool, ip_allow_net0) = false;
111 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net0,
112 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net0), 0,
113 "Allow use of addresses in network 0/8");
114 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0 */
116 VNET_DEFINE(uint32_t, in_loopback_mask) = IN_LOOPBACK_MASK_DFLT;
117 #define V_in_loopback_mask VNET(in_loopback_mask)
118 static int sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS);
119 SYSCTL_PROC(_net_inet_ip, OID_AUTO, loopback_prefixlen,
120 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
121 NULL, 0, sysctl_loopback_prefixlen, "I",
122 "Prefix length of address space reserved for loopback");
123 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127 */
125 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
126 #define V_ripcbinfo VNET(ripcbinfo)
128 static struct sx in_control_sx;
129 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
132 * Return 1 if an internet address is for a ``local'' host
133 * (one to which we have a connection).
136 in_localaddr(struct in_addr in)
138 u_long i = ntohl(in.s_addr);
139 struct in_ifaddr *ia;
143 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
144 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
152 * Return 1 if an internet address is for the local host and configured
153 * on one of its interfaces.
156 in_localip(struct in_addr in)
158 struct in_ifaddr *ia;
162 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
163 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
170 * Like in_localip(), but FIB-aware.
173 in_localip_fib(struct in_addr in, uint16_t fib)
175 struct in_ifaddr *ia;
179 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
180 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
181 ia->ia_ifa.ifa_ifp->if_fib == fib)
188 * Return 1 if an internet address is configured on an interface.
191 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
194 struct in_ifaddr *ia;
198 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
199 if (ifa->ifa_addr->sa_family != AF_INET)
201 ia = (struct in_ifaddr *)ifa;
202 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
210 * Return a reference to the interface address which is different to
211 * the supplied one but with same IP address value.
213 static struct in_ifaddr *
214 in_localip_more(struct in_ifaddr *original_ia)
216 struct epoch_tracker et;
217 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
218 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
219 struct in_ifaddr *ia;
222 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
223 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
224 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
225 if (!V_rt_add_addr_allfibs && (original_fib != fib))
227 if ((original_ia != ia) && (original_addr == addr)) {
228 ifa_ref(&ia->ia_ifa);
239 * Tries to find first IPv4 address in the provided fib.
240 * Prefers non-loopback addresses and return loopback IFF
241 * @loopback_ok is set.
243 * Returns ifa or NULL.
246 in_findlocal(uint32_t fibnum, bool loopback_ok)
248 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
252 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
253 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
254 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
257 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
270 * Determine whether an IP address is in a reserved set of addresses
271 * that may not be forwarded, or whether datagrams to that destination
275 in_canforward(struct in_addr in)
277 u_long i = ntohl(in.s_addr);
279 if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i))
281 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
283 if (IN_ZERONET(i) && !V_ip_allow_net0)
289 * Sysctl to manage prefix of reserved loopback network; translate
290 * to/from mask. The mask is always contiguous high-order 1 bits
291 * followed by all 0 bits.
294 sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)
298 /* ffs is 1-based; compensate. */
299 preflen = 33 - ffs(V_in_loopback_mask);
300 error = sysctl_handle_int(oidp, &preflen, 0, req);
301 if (error || !req->newptr)
303 if (preflen < 8 || preflen > 31)
305 V_in_loopback_mask = 0xffffffff << (32 - preflen);
310 * Trim a mask in a sockaddr
313 in_socktrim(struct sockaddr_in *ap)
315 char *cplim = (char *) &ap->sin_addr;
316 char *cp = (char *) (&ap->sin_addr + 1);
319 while (--cp >= cplim)
321 (ap)->sin_len = cp - (char *) (ap) + 1;
327 * Generic internet control operations (ioctl's).
330 in_control_ioctl(u_long cmd, void *data, struct ifnet *ifp,
333 struct ifreq *ifr = (struct ifreq *)data;
334 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
335 struct epoch_tracker et;
337 struct in_ifaddr *ia;
341 return (EADDRNOTAVAIL);
344 * Filter out 4 ioctls we implement directly. Forward the rest
345 * to specific functions and ifp->if_ioctl().
354 sx_xlock(&in_control_sx);
355 error = in_gifaddr_ioctl(cmd, data, ifp, cred);
356 sx_xunlock(&in_control_sx);
359 sx_xlock(&in_control_sx);
360 error = in_difaddr_ioctl(cmd, data, ifp, cred);
361 sx_xunlock(&in_control_sx);
363 case OSIOCAIFADDR: /* 9.x compat */
365 sx_xlock(&in_control_sx);
366 error = in_aifaddr_ioctl(cmd, data, ifp, cred);
367 sx_xunlock(&in_control_sx);
373 /* We no longer support that old commands. */
376 if (ifp->if_ioctl == NULL)
378 return ((*ifp->if_ioctl)(ifp, cmd, data));
381 if (addr->sin_addr.s_addr != INADDR_ANY &&
382 prison_check_ip4(cred, &addr->sin_addr) != 0)
383 return (EADDRNOTAVAIL);
386 * Find address for this interface, if it exists. If an
387 * address was specified, find that one instead of the
388 * first one on the interface, if possible.
391 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
392 if (ifa->ifa_addr->sa_family != AF_INET)
394 ia = (struct in_ifaddr *)ifa;
395 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
399 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
400 if (ifa->ifa_addr->sa_family == AF_INET) {
401 ia = (struct in_ifaddr *)ifa;
402 if (prison_check_ip4(cred,
403 &ia->ia_addr.sin_addr) == 0)
409 return (EADDRNOTAVAIL);
419 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
423 *addr = ia->ia_broadaddr;
427 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
431 *addr = ia->ia_dstaddr;
435 *addr = ia->ia_sockmask;
445 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
448 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
452 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
454 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
455 const struct sockaddr_in *addr = &ifra->ifra_addr;
456 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
457 const struct sockaddr_in *mask = &ifra->ifra_mask;
458 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
459 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
460 struct epoch_tracker et;
462 struct in_ifaddr *ia;
466 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
471 * ifra_addr must be present and be of INET family.
472 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
474 if (addr->sin_len != sizeof(struct sockaddr_in) ||
475 addr->sin_family != AF_INET)
477 if (broadaddr->sin_len != 0 &&
478 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
479 broadaddr->sin_family != AF_INET))
481 if (mask->sin_len != 0 &&
482 (mask->sin_len != sizeof(struct sockaddr_in) ||
483 mask->sin_family != AF_INET))
485 if ((ifp->if_flags & IFF_POINTOPOINT) &&
486 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
487 dstaddr->sin_addr.s_addr == INADDR_ANY))
488 return (EDESTADDRREQ);
489 if (vhid != 0 && carp_attach_p == NULL)
490 return (EPROTONOSUPPORT);
493 /* Check if a MAC policy disallows setting the IPv4 address. */
494 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
500 * See whether address already exist.
505 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
506 struct in_ifaddr *it;
508 if (ifa->ifa_addr->sa_family != AF_INET)
511 it = (struct in_ifaddr *)ifa;
512 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
513 prison_check_ip4(cred, &addr->sin_addr) == 0)
521 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
523 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
524 ia = (struct in_ifaddr *)ifa;
525 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
526 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
527 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
528 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
529 CALLOUT_RETURNUNLOCKED);
533 if (mask->sin_len != 0) {
534 ia->ia_sockmask = *mask;
535 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
537 in_addr_t i = ntohl(addr->sin_addr.s_addr);
540 * If netmask isn't supplied, use historical default.
541 * This is deprecated for interfaces other than loopback
542 * or point-to-point; warn in other cases. In the future
543 * we should return an error rather than warning.
545 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
546 printf("%s: set address: WARNING: network mask "
547 "should be specified; using historical default\n",
550 ia->ia_subnetmask = IN_CLASSA_NET;
551 else if (IN_CLASSB(i))
552 ia->ia_subnetmask = IN_CLASSB_NET;
554 ia->ia_subnetmask = IN_CLASSC_NET;
555 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
557 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
558 in_socktrim(&ia->ia_sockmask);
560 if (ifp->if_flags & IFF_BROADCAST) {
561 if (broadaddr->sin_len != 0) {
562 ia->ia_broadaddr = *broadaddr;
563 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
564 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
565 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
566 ia->ia_broadaddr.sin_family = AF_INET;
568 ia->ia_broadaddr.sin_addr.s_addr =
569 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
570 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
571 ia->ia_broadaddr.sin_family = AF_INET;
575 if (ifp->if_flags & IFF_POINTOPOINT)
576 ia->ia_dstaddr = *dstaddr;
579 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
584 /* if_addrhead is already referenced by ifa_alloc() */
586 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
587 IF_ADDR_WUNLOCK(ifp);
589 ifa_ref(ifa); /* in_ifaddrhead */
590 sx_assert(&in_control_sx, SA_XLOCKED);
591 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
592 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
596 * Give the interface a chance to initialize
597 * if this is its first address,
598 * and to validate the address if necessary.
600 if (ifp->if_ioctl != NULL) {
601 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
607 * Add route for the network.
610 error = in_addprefix(ia);
616 * Add a loopback route to self.
618 if (vhid == 0 && ia_need_loopback_route(ia)) {
619 struct in_ifaddr *eia;
621 eia = in_localip_more(ia);
624 error = ifa_add_loopback_route((struct ifaddr *)ia,
625 (struct sockaddr *)&ia->ia_addr);
629 ifa_free(&eia->ia_ifa);
632 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
633 struct in_addr allhosts_addr;
634 struct in_ifinfo *ii;
636 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
637 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
639 error = in_joingroup(ifp, &allhosts_addr, NULL,
644 * Note: we don't need extra reference for ifa, since we called
645 * with sx lock held, and ifaddr can not be deleted in concurrent
648 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
654 (void )in_scrubprefix(ia, LLE_STATIC);
657 if (ia->ia_ifa.ifa_carp)
658 (*carp_detach_p)(&ia->ia_ifa, false);
661 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
662 IF_ADDR_WUNLOCK(ifp);
663 ifa_free(&ia->ia_ifa); /* if_addrhead */
665 sx_assert(&in_control_sx, SA_XLOCKED);
666 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
667 CK_LIST_REMOVE(ia, ia_hash);
668 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
674 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
676 const struct ifreq *ifr = (struct ifreq *)data;
677 const struct sockaddr_in *addr = (const struct sockaddr_in *)
680 struct in_ifaddr *ia;
681 bool deleteAny, iaIsLast;
685 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
690 if (addr->sin_len != sizeof(struct sockaddr_in) ||
691 addr->sin_family != AF_INET)
699 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
700 struct in_ifaddr *it;
702 if (ifa->ifa_addr->sa_family != AF_INET)
705 it = (struct in_ifaddr *)ifa;
706 if (deleteAny && ia == NULL && (cred == NULL ||
707 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
710 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
711 (cred == NULL || prison_check_ip4(cred,
712 &addr->sin_addr) == 0))
720 IF_ADDR_WUNLOCK(ifp);
721 return (EADDRNOTAVAIL);
724 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
725 IF_ADDR_WUNLOCK(ifp);
726 ifa_free(&ia->ia_ifa); /* if_addrhead */
728 sx_assert(&in_control_sx, SA_XLOCKED);
729 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
730 CK_LIST_REMOVE(ia, ia_hash);
733 * in_scrubprefix() kills the interface route.
735 in_scrubprefix(ia, LLE_STATIC);
738 * in_ifadown gets rid of all the rest of
739 * the routes. This is not quite the right
740 * thing to do, but at least if we are running
741 * a routing process they will come back.
743 in_ifadown(&ia->ia_ifa, 1);
745 if (ia->ia_ifa.ifa_carp)
746 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
749 * If this is the last IPv4 address configured on this
750 * interface, leave the all-hosts group.
751 * No state-change report need be transmitted.
753 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
754 struct in_ifinfo *ii;
756 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
757 if (ii->ii_allhosts) {
758 (void)in_leavegroup(ii->ii_allhosts, NULL);
759 ii->ii_allhosts = NULL;
764 if (callout_stop(&ia->ia_garp_timer) == 1) {
765 ifa_free(&ia->ia_ifa);
767 IF_ADDR_WUNLOCK(ifp);
769 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
771 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
777 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
779 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
780 const struct sockaddr_in *addr = &ifra->ifra_addr;
781 struct epoch_tracker et;
783 struct in_ifaddr *ia;
786 * ifra_addr must be present and be of INET family.
788 if (addr->sin_len != sizeof(struct sockaddr_in) ||
789 addr->sin_family != AF_INET)
793 * See whether address exist.
797 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
798 struct in_ifaddr *it;
800 if (ifa->ifa_addr->sa_family != AF_INET)
803 it = (struct in_ifaddr *)ifa;
804 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
805 prison_check_ip4(cred, &addr->sin_addr) == 0) {
812 return (EADDRNOTAVAIL);
815 ifra->ifra_mask = ia->ia_sockmask;
816 if ((ifp->if_flags & IFF_POINTOPOINT) &&
817 ia->ia_dstaddr.sin_family == AF_INET)
818 ifra->ifra_dstaddr = ia->ia_dstaddr;
819 else if ((ifp->if_flags & IFF_BROADCAST) &&
820 ia->ia_broadaddr.sin_family == AF_INET)
821 ifra->ifra_broadaddr = ia->ia_broadaddr;
823 memset(&ifra->ifra_broadaddr, 0,
824 sizeof(ifra->ifra_broadaddr));
831 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
834 if (nh->nh_ifa == (struct ifaddr *)arg)
841 in_handle_prefix_route(uint32_t fibnum, int cmd,
842 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
848 /* Prepare gateway */
849 struct sockaddr_dl_short sdl = {
850 .sdl_family = AF_LINK,
851 .sdl_len = sizeof(struct sockaddr_dl_short),
852 .sdl_type = ifa->ifa_ifp->if_type,
853 .sdl_index = ifa->ifa_ifp->if_index,
856 struct rt_addrinfo info = {
859 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
861 [RTAX_DST] = (struct sockaddr *)dst,
862 [RTAX_NETMASK] = (struct sockaddr *)netmask,
863 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
865 /* Ensure we delete the prefix IFF prefix ifa matches */
866 .rti_filter = in_match_ifaddr,
867 .rti_filterdata = ifa,
870 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
874 * Routing table interaction with interface addresses.
876 * In general, two types of routes needs to be installed:
877 * a) "interface" or "prefix" route, telling user that the addresses
878 * behind the ifa prefix are reached directly.
879 * b) "loopback" route installed for the ifa address, telling user that
880 * the address belongs to local system.
882 * Handling for (a) and (b) differs in multi-fib aspects, hence they
883 * are implemented in different functions below.
885 * The cases above may intersect - /32 interface aliases results in
886 * the same prefix produced by (a) and (b). This blurs the definition
887 * of the "loopback" route and complicate interactions. The interaction
888 * table is defined below. The case numbers are used in the multiple
889 * functions below to refer to the particular test case.
891 * There can be multiple options:
892 * 1) Adding address with prefix on non-p2p/non-loopback interface.
893 * Example: 192.0.2.1/24. Action:
894 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
895 * using @ia as an address source.
896 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
897 * @ia ifp in the gateway and using @ia as an address source.
899 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
900 * Example: 192.0.2.2/32. Action:
901 * * add "prefix" host route via V_loif, using @ia as an address source.
903 * 3) Adding address with or without prefix to p2p interface.
904 * Example: 10.0.0.1/24->10.0.0.2. Action:
905 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
906 * as an address source. Note: no sense in installing full /24 as the interface
908 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
909 * @ia ifp in the gateway and using @ia as an address source.
911 * 4) Adding address with or without prefix to loopback interface.
912 * Example: 192.0.2.1/24. Action:
913 * * add "prefix" host route via @ia interface, using @ia as an address source.
914 * Note: Skip installing /24 prefix as it would introduce TTL loop
915 * for the traffic destined to these addresses.
919 * Checks if @ia needs to install loopback route to @ia address via
920 * ifa_maintain_loopback_route().
922 * Return true on success.
925 ia_need_loopback_route(const struct in_ifaddr *ia)
927 struct ifnet *ifp = ia->ia_ifp;
929 /* Case 4: Skip loopback interfaces */
930 if ((ifp->if_flags & IFF_LOOPBACK) ||
931 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
934 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
935 if ((ifp->if_flags & IFF_POINTOPOINT) &&
936 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
939 /* Case 2: skip /32 prefixes */
940 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
941 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
948 * Calculate "prefix" route corresponding to @ia.
951 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
954 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
955 /* Case 3: return host route for dstaddr */
956 *prefix = ia->ia_dstaddr.sin_addr;
957 mask->s_addr = INADDR_BROADCAST;
958 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
959 /* Case 4: return host route for ifaddr */
960 *prefix = ia->ia_addr.sin_addr;
961 mask->s_addr = INADDR_BROADCAST;
963 /* Cases 1,2: return actual ia prefix */
964 *prefix = ia->ia_addr.sin_addr;
965 *mask = ia->ia_sockmask.sin_addr;
966 prefix->s_addr &= mask->s_addr;
971 * Adds or delete interface "prefix" route corresponding to @ifa.
972 * Returns 0 on success or errno.
975 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
977 struct ifaddr *ifa = &ia->ia_ifa;
978 struct in_addr daddr, maddr;
979 struct sockaddr_in *pmask;
980 struct epoch_tracker et;
983 ia_getrtprefix(ia, &daddr, &maddr);
985 struct sockaddr_in mask = {
986 .sin_family = AF_INET,
987 .sin_len = sizeof(struct sockaddr_in),
991 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
993 struct sockaddr_in dst = {
994 .sin_family = AF_INET,
995 .sin_len = sizeof(struct sockaddr_in),
996 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
999 struct ifnet *ifp = ia->ia_ifp;
1001 if ((maddr.s_addr == INADDR_BROADCAST) &&
1002 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1003 /* Case 2: host route on broadcast interface */
1007 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1008 NET_EPOCH_ENTER(et);
1009 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1016 * Check if we have a route for the given prefix already.
1019 in_hasrtprefix(struct in_ifaddr *target)
1021 struct epoch_tracker et;
1022 struct in_ifaddr *ia;
1023 struct in_addr prefix, mask, p, m;
1024 bool result = false;
1026 ia_getrtprefix(target, &prefix, &mask);
1028 /* Look for an existing address with the same prefix, mask, and fib */
1029 NET_EPOCH_ENTER(et);
1030 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1031 ia_getrtprefix(ia, &p, &m);
1033 if (prefix.s_addr != p.s_addr ||
1034 mask.s_addr != m.s_addr)
1037 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1041 * If we got a matching prefix route inserted by other
1042 * interface address, we are done here.
1044 if (ia->ia_flags & IFA_ROUTE) {
1055 in_addprefix(struct in_ifaddr *target)
1059 if (in_hasrtprefix(target)) {
1063 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1064 target->ia_ifp->if_fib);
1070 * No-one seem to have this prefix route, so we try to insert it.
1072 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1073 error = in_handle_ifaddr_route(RTM_ADD, target);
1075 target->ia_flags |= IFA_ROUTE;
1080 * Removes either all lle entries for given @ia, or lle
1081 * corresponding to @ia address.
1084 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1086 struct sockaddr_in addr, mask;
1087 struct sockaddr *saddr, *smask;
1090 saddr = (struct sockaddr *)&addr;
1091 bzero(&addr, sizeof(addr));
1092 addr.sin_len = sizeof(addr);
1093 addr.sin_family = AF_INET;
1094 smask = (struct sockaddr *)&mask;
1095 bzero(&mask, sizeof(mask));
1096 mask.sin_len = sizeof(mask);
1097 mask.sin_family = AF_INET;
1098 mask.sin_addr.s_addr = ia->ia_subnetmask;
1103 * Remove all L2 entries matching given prefix.
1104 * Convert address to host representation to avoid
1105 * doing this on every callback. ia_subnetmask is already
1106 * stored in host representation.
1108 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1109 lltable_prefix_free(AF_INET, saddr, smask, flags);
1111 /* Remove interface address only */
1112 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1113 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1118 * If there is no other address in the system that can serve a route to the
1119 * same prefix, remove the route. Hand over the route to the new address
1123 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1125 struct epoch_tracker et;
1126 struct in_ifaddr *ia;
1127 struct in_addr prefix, mask, p, m;
1131 * Remove the loopback route to the interface address.
1133 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1134 struct in_ifaddr *eia;
1136 eia = in_localip_more(target);
1139 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1140 (struct sockaddr *)&target->ia_addr);
1141 ifa_free(&eia->ia_ifa);
1143 error = ifa_del_loopback_route((struct ifaddr *)target,
1144 (struct sockaddr *)&target->ia_addr);
1148 ia_getrtprefix(target, &prefix, &mask);
1150 if ((target->ia_flags & IFA_ROUTE) == 0) {
1151 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1154 * Removing address from !IFF_UP interface or
1155 * prefix which exists on other interface (along with route).
1156 * No entries should exist here except target addr.
1157 * Given that, delete this entry only.
1159 in_scrubprefixlle(target, 0, flags);
1163 NET_EPOCH_ENTER(et);
1164 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1165 ia_getrtprefix(ia, &p, &m);
1167 if (prefix.s_addr != p.s_addr ||
1168 mask.s_addr != m.s_addr)
1171 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1175 * If we got a matching prefix address, move IFA_ROUTE and
1176 * the route itself to it. Make sure that routing daemons
1179 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1180 ifa_ref(&ia->ia_ifa);
1182 error = in_handle_ifaddr_route(RTM_DELETE, target);
1184 target->ia_flags &= ~IFA_ROUTE;
1186 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1188 /* Scrub all entries IFF interface is different */
1189 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1191 error = in_handle_ifaddr_route(RTM_ADD, ia);
1193 ia->ia_flags |= IFA_ROUTE;
1195 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1197 ifa_free(&ia->ia_ifa);
1204 * remove all L2 entries on the given prefix
1206 in_scrubprefixlle(target, 1, flags);
1209 * As no-one seem to have this prefix, we can remove the route.
1211 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1212 error = in_handle_ifaddr_route(RTM_DELETE, target);
1214 target->ia_flags &= ~IFA_ROUTE;
1216 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1221 in_ifscrub_all(void)
1224 struct ifaddr *ifa, *nifa;
1225 struct ifaliasreq ifr;
1228 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1229 /* Cannot lock here - lock recursion. */
1230 /* NET_EPOCH_ENTER(et); */
1231 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1232 if (ifa->ifa_addr->sa_family != AF_INET)
1236 * This is ugly but the only way for legacy IP to
1237 * cleanly remove addresses and everything attached.
1239 bzero(&ifr, sizeof(ifr));
1240 ifr.ifra_addr = *ifa->ifa_addr;
1241 if (ifa->ifa_dstaddr)
1242 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
1243 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1246 /* NET_EPOCH_EXIT(et); */
1247 in_purgemaddrs(ifp);
1248 igmp_domifdetach(ifp);
1254 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1257 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1259 * Optionally check for old-style (host 0) broadcast, but
1260 * taking into account that RFC 3021 obsoletes it.
1262 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1263 ntohl(in.s_addr) == ia->ia_subnet)) &&
1265 * Check for an all one subnetmask. These
1266 * only exist when an interface gets a secondary
1269 ia->ia_subnetmask != (u_long)0xffffffff);
1273 * Return 1 if the address might be a local broadcast address.
1276 in_broadcast(struct in_addr in, struct ifnet *ifp)
1283 if (in.s_addr == INADDR_BROADCAST ||
1284 in.s_addr == INADDR_ANY)
1286 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1290 * Look through the list of addresses for a match
1291 * with a broadcast address.
1293 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1294 if (ifa->ifa_addr->sa_family == AF_INET &&
1295 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1303 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1306 in_ifdetach(struct ifnet *ifp)
1309 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1310 in_pcbpurgeif0(&V_udbinfo, ifp);
1311 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1312 in_purgemaddrs(ifp);
1316 * Make sure all multicast deletions invoking if_ioctl() are
1317 * completed before returning. Else we risk accessing a freed
1318 * ifnet structure pointer.
1320 inm_release_wait(NULL);
1324 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1326 struct epoch_tracker et;
1328 struct in_ifaddr *ia;
1331 NET_EPOCH_ENTER(et);
1333 case IFNET_EVENT_DOWN:
1334 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1335 if (ifa->ifa_addr->sa_family != AF_INET)
1337 ia = (struct in_ifaddr *)ifa;
1338 if ((ia->ia_flags & IFA_ROUTE) == 0)
1342 * in_scrubprefix() kills the interface route.
1344 in_scrubprefix(ia, 0);
1346 * in_ifadown gets rid of all the rest of the
1347 * routes. This is not quite the right thing
1348 * to do, but at least if we are running a
1349 * routing process they will come back.
1356 case IFNET_EVENT_UP:
1357 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1358 if (ifa->ifa_addr->sa_family != AF_INET)
1360 ia = (struct in_ifaddr *)ifa;
1361 if (ia->ia_flags & IFA_ROUTE)
1364 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1365 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1366 error = in_handle_ifaddr_route(RTM_ADD, ia);
1368 ia->ia_flags |= IFA_ROUTE;
1369 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1376 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1379 * Delete all IPv4 multicast address records, and associated link-layer
1380 * multicast address records, associated with ifp.
1381 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1382 * XXX This should not race with ifma_protospec being set during
1383 * a new allocation, if it does, we have bigger problems.
1386 in_purgemaddrs(struct ifnet *ifp)
1388 struct epoch_tracker et;
1389 struct in_multi_head purgeinms;
1390 struct in_multi *inm;
1391 struct ifmultiaddr *ifma;
1393 SLIST_INIT(&purgeinms);
1394 IN_MULTI_LIST_LOCK();
1397 * Extract list of in_multi associated with the detaching ifp
1398 * which the PF_INET layer is about to release.
1399 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1400 * by code further down.
1403 NET_EPOCH_ENTER(et);
1404 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1405 inm = inm_ifmultiaddr_get_inm(ifma);
1408 inm_rele_locked(&purgeinms, inm);
1411 IF_ADDR_WUNLOCK(ifp);
1413 inm_release_list_deferred(&purgeinms);
1415 IN_MULTI_LIST_UNLOCK();
1419 struct llentry base;
1422 #define IN_LLTBL_DEFAULT_HSIZE 32
1423 #define IN_LLTBL_HASH(k, h) \
1424 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1427 * Do actual deallocation of @lle.
1430 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1432 struct llentry *lle;
1434 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1435 LLE_LOCK_DESTROY(lle);
1436 LLE_REQ_DESTROY(lle);
1437 free(lle, M_LLTABLE);
1441 * Called by LLE_FREE_LOCKED when number of references
1445 in_lltable_destroy_lle(struct llentry *lle)
1449 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1452 static struct llentry *
1453 in_lltable_new(struct in_addr addr4, u_int flags)
1455 struct in_llentry *lle;
1457 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1458 if (lle == NULL) /* NB: caller generates msg */
1462 * For IPv4 this will trigger "arpresolve" to generate
1465 lle->base.la_expire = time_uptime; /* mark expired */
1466 lle->base.r_l3addr.addr4 = addr4;
1467 lle->base.lle_refcnt = 1;
1468 lle->base.lle_free = in_lltable_destroy_lle;
1469 LLE_LOCK_INIT(&lle->base);
1470 LLE_REQ_INIT(&lle->base);
1471 callout_init(&lle->base.lle_timer, 1);
1473 return (&lle->base);
1476 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1477 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1480 in_lltable_match_prefix(const struct sockaddr *saddr,
1481 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1483 struct in_addr addr, mask, lle_addr;
1485 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1486 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1487 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1489 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1492 if (lle->la_flags & LLE_IFADDR) {
1494 * Delete LLE_IFADDR records IFF address & flag matches.
1495 * Note that addr is the interface address within prefix
1497 * Note also we should handle 'ifdown' cases without removing
1500 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1505 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1506 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1513 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1515 size_t pkts_dropped;
1517 LLE_WLOCK_ASSERT(lle);
1518 KASSERT(llt != NULL, ("lltable is NULL"));
1520 /* Unlink entry from table if not already */
1521 if ((lle->la_flags & LLE_LINKED) != 0) {
1522 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1523 lltable_unlink_entry(llt, lle);
1526 /* Drop hold queue */
1527 pkts_dropped = llentry_free(lle);
1528 ARPSTAT_ADD(dropped, pkts_dropped);
1532 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1534 struct nhop_object *nh;
1535 struct in_addr addr;
1537 KASSERT(l3addr->sa_family == AF_INET,
1538 ("sin_family %d", l3addr->sa_family));
1540 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1542 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1547 * If the gateway for an existing host route matches the target L3
1548 * address, which is a special route inserted by some implementation
1549 * such as MANET, and the interface is of the correct type, then
1550 * allow for ARP to proceed.
1552 if (nh->nh_flags & NHF_GATEWAY) {
1553 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1554 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1555 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1556 sizeof(in_addr_t)) != 0) {
1562 * Make sure that at least the destination address is covered
1563 * by the route. This is for handling the case where 2 or more
1564 * interfaces have the same prefix. An incoming packet arrives
1565 * on one interface and the corresponding outgoing packet leaves
1566 * another interface.
1568 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1569 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1570 struct in_addr dst_addr, mask_addr;
1576 * ifaof_ifpforaddr() returns _best matching_ IFA.
1577 * It is possible that ifa prefix does not cover our address.
1578 * Explicitly verify and fail if that's the case.
1580 dst_addr = IA_SIN(ia)->sin_addr;
1581 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1583 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1590 static inline uint32_t
1591 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1594 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1598 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1601 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1605 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1607 struct sockaddr_in *sin;
1609 sin = (struct sockaddr_in *)sa;
1610 bzero(sin, sizeof(*sin));
1611 sin->sin_family = AF_INET;
1612 sin->sin_len = sizeof(*sin);
1613 sin->sin_addr = lle->r_l3addr.addr4;
1616 static inline struct llentry *
1617 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1619 struct llentry *lle;
1620 struct llentries *lleh;
1623 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1624 lleh = &llt->lle_head[hashidx];
1625 CK_LIST_FOREACH(lle, lleh, lle_next) {
1626 if (lle->la_flags & LLE_DELETED)
1628 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1636 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1639 lle->la_flags |= LLE_DELETED;
1640 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1642 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1647 static struct llentry *
1648 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1650 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1651 struct ifnet *ifp = llt->llt_ifp;
1652 struct llentry *lle;
1653 char linkhdr[LLE_MAX_LINKHDR];
1657 KASSERT(l3addr->sa_family == AF_INET,
1658 ("sin_family %d", l3addr->sa_family));
1661 * A route that covers the given address must have
1662 * been installed 1st because we are doing a resolution,
1665 if (!(flags & LLE_IFADDR) &&
1666 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1669 lle = in_lltable_new(sin->sin_addr, flags);
1671 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1674 lle->la_flags = flags;
1675 if (flags & LLE_STATIC)
1676 lle->r_flags |= RLLE_VALID;
1677 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1678 linkhdrsize = LLE_MAX_LINKHDR;
1679 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1680 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1681 in_lltable_free_entry(llt, lle);
1684 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1686 lle->la_flags |= LLE_STATIC;
1687 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1695 * Return NULL if not found or marked for deletion.
1696 * If found return lle read locked.
1698 static struct llentry *
1699 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1701 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1702 struct llentry *lle;
1704 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1705 KASSERT(l3addr->sa_family == AF_INET,
1706 ("sin_family %d", l3addr->sa_family));
1707 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1708 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1709 ("wrong lle request flags: %#x", flags));
1711 lle = in_lltable_find_dst(llt, sin->sin_addr);
1714 if (flags & LLE_UNLOCKED)
1717 if (flags & LLE_EXCLUSIVE)
1723 * If the afdata lock is not held, the LLE may have been unlinked while
1724 * we were blocked on the LLE lock. Check for this case.
1726 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1727 if (flags & LLE_EXCLUSIVE)
1737 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1738 struct sysctl_req *wr)
1740 struct ifnet *ifp = llt->llt_ifp;
1743 struct rt_msghdr rtm;
1744 struct sockaddr_in sin;
1745 struct sockaddr_dl sdl;
1747 struct sockaddr_dl *sdl;
1750 bzero(&arpc, sizeof(arpc));
1751 /* skip deleted entries */
1752 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1754 /* Skip if jailed and not a valid IP of the prison. */
1755 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1756 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1759 * produce a msg made of:
1761 * struct sockaddr_in; (IPv4)
1762 * struct sockaddr_dl;
1764 arpc.rtm.rtm_msglen = sizeof(arpc);
1765 arpc.rtm.rtm_version = RTM_VERSION;
1766 arpc.rtm.rtm_type = RTM_GET;
1767 arpc.rtm.rtm_flags = RTF_UP;
1768 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1771 if (lle->la_flags & LLE_PUB)
1772 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1775 sdl->sdl_family = AF_LINK;
1776 sdl->sdl_len = sizeof(*sdl);
1777 sdl->sdl_index = ifp->if_index;
1778 sdl->sdl_type = ifp->if_type;
1779 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1780 sdl->sdl_alen = ifp->if_addrlen;
1781 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1784 bzero(LLADDR(sdl), ifp->if_addrlen);
1787 arpc.rtm.rtm_rmx.rmx_expire =
1788 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1789 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1790 if (lle->la_flags & LLE_STATIC)
1791 arpc.rtm.rtm_flags |= RTF_STATIC;
1792 if (lle->la_flags & LLE_IFADDR)
1793 arpc.rtm.rtm_flags |= RTF_PINNED;
1794 arpc.rtm.rtm_index = ifp->if_index;
1795 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1801 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1803 struct ifnet *ifp = llt->llt_ifp;
1805 /* gratuitous ARP */
1806 if ((lle->la_flags & LLE_PUB) != 0)
1807 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1811 static struct lltable *
1812 in_lltattach(struct ifnet *ifp)
1814 struct lltable *llt;
1816 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1817 llt->llt_af = AF_INET;
1820 llt->llt_lookup = in_lltable_lookup;
1821 llt->llt_alloc_entry = in_lltable_alloc;
1822 llt->llt_delete_entry = in_lltable_delete_entry;
1823 llt->llt_dump_entry = in_lltable_dump_entry;
1824 llt->llt_hash = in_lltable_hash;
1825 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1826 llt->llt_free_entry = in_lltable_free_entry;
1827 llt->llt_match_prefix = in_lltable_match_prefix;
1828 llt->llt_mark_used = llentry_mark_used;
1829 llt->llt_post_resolved = in_lltable_post_resolved;
1836 in_lltable_get(struct ifnet *ifp)
1838 struct lltable *llt = NULL;
1840 void *afdata_ptr = ifp->if_afdata[AF_INET];
1841 if (afdata_ptr != NULL)
1842 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1847 in_domifattach(struct ifnet *ifp)
1849 struct in_ifinfo *ii;
1851 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1853 ii->ii_llt = in_lltattach(ifp);
1854 ii->ii_igmp = igmp_domifattach(ifp);
1860 in_domifdetach(struct ifnet *ifp, void *aux)
1862 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1864 igmp_domifdetach(ifp);
1865 lltable_free(ii->ii_llt);