2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)in.c 8.4 (Berkeley) 1/9/95
30 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
33 #include "opt_bootp.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/sockio.h>
39 #include <sys/malloc.h>
42 #include <sys/msgport.h>
43 #include <sys/socket.h>
45 #include <sys/kernel.h>
46 #include <sys/sysctl.h>
47 #include <sys/thread2.h>
50 #include <net/if_types.h>
51 #include <net/route.h>
52 #include <net/netmsg2.h>
53 #include <net/netisr2.h>
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/in_pcb.h>
58 #include <netinet/udp_var.h>
60 #include <netinet/igmp_var.h>
62 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
64 static int in_mask2len (struct in_addr *);
65 static void in_len2mask (struct in_addr *, int);
66 static int in_lifaddr_ioctl (u_long, caddr_t, struct ifnet *, struct thread *);
68 static void in_socktrim (struct sockaddr_in *);
69 static int in_ifinit(struct ifnet *, struct in_ifaddr *,
70 const struct sockaddr_in *, int);
72 static int in_control_internal(u_long, caddr_t, struct ifnet *,
75 static int in_addprefix(struct in_ifaddr *, int);
76 static void in_scrubprefix(struct in_ifaddr *);
78 static int subnetsarelocal = 0;
79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
81 "Count all internet addresses of subnets of the local net as local");
83 struct in_multihead in_multihead; /* XXX BSS initialization */
85 extern struct inpcbinfo ripcbinfo;
88 * Return 1 if an internet address is for a ``local'' host
89 * (one to which we have a connection). If subnetsarelocal
90 * is true, this includes other subnets of the local net.
91 * Otherwise, it includes only the directly-connected (sub)nets.
94 in_localaddr(struct in_addr in)
96 u_long i = ntohl(in.s_addr);
97 struct in_ifaddr_container *iac;
100 if (subnetsarelocal) {
101 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
104 if ((i & ia->ia_netmask) == ia->ia_net)
108 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
111 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
119 * Determine whether an IP address is in a reserved set of addresses
120 * that may not be forwarded, or whether datagrams to that destination
124 in_canforward(struct in_addr in)
126 u_long i = ntohl(in.s_addr);
129 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
132 net = i & IN_CLASSA_NET;
133 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
140 * Trim a mask in a sockaddr
143 in_socktrim(struct sockaddr_in *ap)
145 char *cplim = (char *) &ap->sin_addr;
146 char *cp = (char *) (&ap->sin_addr + 1);
149 while (--cp >= cplim)
151 (ap)->sin_len = cp - (char *) (ap) + 1;
157 in_mask2len(struct in_addr *mask)
163 for (x = 0; x < sizeof *mask; x++) {
168 if (x < sizeof *mask) {
169 for (y = 0; y < 8; y++) {
170 if ((p[x] & (0x80 >> y)) == 0)
178 in_len2mask(struct in_addr *mask, int len)
184 bzero(mask, sizeof *mask);
185 for (i = 0; i < len / 8; i++)
188 p[i] = (0xff00 >> (len % 8)) & 0xff;
192 in_control_dispatch(netmsg_t msg)
196 error = in_control(msg->control.nm_cmd, msg->control.nm_data,
197 msg->control.nm_ifp, msg->control.nm_td);
198 lwkt_replymsg(&msg->lmsg, error);
202 in_control_internal_dispatch(netmsg_t msg)
206 error = in_control_internal(msg->control.nm_cmd,
207 msg->control.nm_data,
210 lwkt_replymsg(&msg->lmsg, error);
214 * Generic internet control operations (ioctl's).
215 * Ifp is 0 if not an interface-specific ioctl.
217 * NOTE! td might be NULL.
220 in_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
222 struct netmsg_pru_control msg;
236 * Dispatch these SIOCs to netisr0.
238 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
239 in_control_internal_dispatch);
244 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
245 return msg.base.lmsg.ms_error;
248 return in_control_internal(cmd, data, ifp, td);
253 in_ialink_dispatch(netmsg_t msg)
255 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
256 struct ifaddr_container *ifac;
257 struct in_ifaddr_container *iac;
262 ifac = &ia->ia_ifa.ifa_containers[cpu];
263 ASSERT_IFAC_VALID(ifac);
264 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
265 ("ia is on in_ifaddrheads"));
267 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
268 iac = &ifac->ifa_proto_u.u_in_ifac;
269 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
273 netisr_forwardmsg_all(&msg->base, cpu + 1);
277 in_iaunlink_dispatch(netmsg_t msg)
279 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
280 struct ifaddr_container *ifac;
281 struct in_ifaddr_container *iac;
286 ifac = &ia->ia_ifa.ifa_containers[cpu];
287 ASSERT_IFAC_VALID(ifac);
288 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
289 ("ia is not on in_ifaddrheads"));
291 iac = &ifac->ifa_proto_u.u_in_ifac;
292 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
293 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
297 netisr_forwardmsg_all(&msg->base, cpu + 1);
301 in_iahashins_dispatch(netmsg_t msg)
303 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
304 struct ifaddr_container *ifac;
305 struct in_ifaddr_container *iac;
310 ifac = &ia->ia_ifa.ifa_containers[cpu];
311 ASSERT_IFAC_VALID(ifac);
312 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
313 ("ia is on in_ifaddrhashtbls"));
315 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
316 iac = &ifac->ifa_proto_u.u_in_ifac;
317 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
322 netisr_forwardmsg_all(&msg->base, cpu + 1);
326 in_iahashrem_dispatch(netmsg_t msg)
328 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
329 struct ifaddr_container *ifac;
330 struct in_ifaddr_container *iac;
335 ifac = &ia->ia_ifa.ifa_containers[cpu];
336 ASSERT_IFAC_VALID(ifac);
337 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
338 ("ia is not on in_ifaddrhashtbls"));
340 iac = &ifac->ifa_proto_u.u_in_ifac;
341 LIST_REMOVE(iac, ia_hash);
342 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
346 netisr_forwardmsg_all(&msg->base, cpu + 1);
350 in_ialink(struct in_ifaddr *ia)
352 struct netmsg_base msg;
354 netmsg_init(&msg, NULL, &curthread->td_msgport,
355 0, in_ialink_dispatch);
356 msg.lmsg.u.ms_resultp = ia;
358 netisr_domsg(&msg, 0);
362 in_iaunlink(struct in_ifaddr *ia)
364 struct netmsg_base msg;
366 netmsg_init(&msg, NULL, &curthread->td_msgport,
367 0, in_iaunlink_dispatch);
368 msg.lmsg.u.ms_resultp = ia;
370 netisr_domsg(&msg, 0);
374 in_iahash_insert(struct in_ifaddr *ia)
376 struct netmsg_base msg;
378 netmsg_init(&msg, NULL, &curthread->td_msgport,
379 0, in_iahashins_dispatch);
380 msg.lmsg.u.ms_resultp = ia;
382 netisr_domsg(&msg, 0);
386 in_iahash_remove(struct in_ifaddr *ia)
388 struct netmsg_base msg;
390 netmsg_init(&msg, NULL, &curthread->td_msgport,
391 0, in_iahashrem_dispatch);
392 msg.lmsg.u.ms_resultp = ia;
394 netisr_domsg(&msg, 0);
397 static __inline struct in_ifaddr *
398 in_ianext(struct in_ifaddr *oia)
400 struct ifaddr_container *ifac;
401 struct in_ifaddr_container *iac;
403 ifac = &oia->ia_ifa.ifa_containers[mycpuid];
404 ASSERT_IFAC_VALID(ifac);
405 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
406 ("ia is not on in_ifaddrheads"));
408 iac = &ifac->ifa_proto_u.u_in_ifac;
409 iac = TAILQ_NEXT(iac, ia_link);
417 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
420 struct ifreq *ifr = (struct ifreq *)data;
421 struct in_ifaddr *ia = NULL;
423 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
424 struct ifaddr_container *ifac;
425 struct in_ifaddr_container *iac;
426 struct sockaddr_in oldaddr;
427 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
433 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
439 return in_lifaddr_ioctl(cmd, data, ifp, td);
446 * Find address for this interface, if it exists.
448 * If an alias address was specified, find that one instead of
449 * the first one on the interface, if possible
452 struct in_ifaddr *iap;
454 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
455 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
457 if (iap->ia_ifp == ifp &&
458 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
464 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
466 iap = ifatoia(ifac->ifa);
467 if (iap->ia_addr.sin_family == AF_INET) {
474 if (ifp->if_flags & IFF_UP)
483 return (EADDRNOTAVAIL);
484 if (ifra->ifra_addr.sin_family == AF_INET) {
486 if (ia->ia_ifp == ifp &&
487 ia->ia_addr.sin_addr.s_addr ==
488 ifra->ifra_addr.sin_addr.s_addr)
492 if ((ifp->if_flags & IFF_POINTOPOINT) &&
493 cmd == SIOCAIFADDR &&
494 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
498 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL)
499 return (EADDRNOTAVAIL);
500 if (cmd == SIOCGIFALIAS)
506 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
510 return (EADDRNOTAVAIL);
512 if (cmd == SIOCSIFDSTADDR &&
513 (ifp->if_flags & IFF_POINTOPOINT) == 0)
520 ia = ifa_create(sizeof(*ia));
524 * Setup per-CPU information
526 for (i = 0; i < ncpus; ++i) {
527 ifac = &ifa->ifa_containers[i];
528 iac = &ifac->ifa_proto_u.u_in_ifac;
533 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
534 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
535 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
536 ia->ia_sockmask.sin_len = 8;
537 ia->ia_sockmask.sin_family = AF_INET;
538 if (ifp->if_flags & IFF_BROADCAST) {
539 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
540 ia->ia_broadaddr.sin_family = AF_INET;
546 ifa_iflink(ifa, ifp, 1);
551 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
560 return (EADDRNOTAVAIL);
566 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
570 if ((ifp->if_flags & IFF_BROADCAST) == 0)
572 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
576 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
578 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
582 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
586 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
588 oldaddr = ia->ia_dstaddr;
589 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
590 if (ifp->if_ioctl != NULL) {
591 ifnet_serialize_all(ifp);
592 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
593 td->td_proc->p_ucred);
594 ifnet_deserialize_all(ifp);
596 ia->ia_dstaddr = oldaddr;
600 if (ia->ia_flags & IFA_ROUTE) {
601 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
602 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
603 ia->ia_ifa.ifa_dstaddr =
604 (struct sockaddr *)&ia->ia_dstaddr;
605 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
610 if ((ifp->if_flags & IFF_BROADCAST) == 0)
612 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
616 error = in_ifinit(ifp, ia,
617 (const struct sockaddr_in *)&ifr->ifr_addr, 1);
618 if (error != 0 && iaIsNew)
621 EVENTHANDLER_INVOKE(ifaddr_event, ifp,
622 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
625 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
627 * Interface is brought up by in_ifinit()
628 * (via ifp->if_ioctl). We act as if the
629 * interface got IFF_UP flag turned on.
636 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
637 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
644 if (ia->ia_addr.sin_family == AF_INET) {
645 if (ifra->ifra_addr.sin_len == 0) {
646 ifra->ifra_addr = ia->ia_addr;
648 } else if (ifra->ifra_addr.sin_addr.s_addr ==
649 ia->ia_addr.sin_addr.s_addr) {
653 if (ifra->ifra_mask.sin_len) {
655 ia->ia_sockmask = ifra->ifra_mask;
656 ia->ia_sockmask.sin_family = AF_INET;
658 ntohl(ia->ia_sockmask.sin_addr.s_addr);
661 if ((ifp->if_flags & IFF_POINTOPOINT) &&
662 ifra->ifra_dstaddr.sin_family == AF_INET) {
664 ia->ia_dstaddr = ifra->ifra_dstaddr;
665 maskIsNew = 1; /* We lie; but the effect's the same */
667 if (ifra->ifra_addr.sin_family == AF_INET &&
668 (hostIsNew || maskIsNew))
669 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
671 if (error != 0 && iaIsNew)
674 if ((ifp->if_flags & IFF_BROADCAST) &&
675 ifra->ifra_broadaddr.sin_family == AF_INET)
676 ia->ia_broadaddr = ifra->ifra_broadaddr;
678 EVENTHANDLER_INVOKE(ifaddr_event, ifp,
679 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
682 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
683 /* See the comment in SIOCSIFADDR */
689 ifra->ifra_mask = ia->ia_sockmask;
690 if ((ifp->if_flags & IFF_POINTOPOINT) &&
691 (ia->ia_dstaddr.sin_family == AF_INET))
692 ifra->ifra_dstaddr = ia->ia_dstaddr;
693 else if ((ifp->if_flags & IFF_BROADCAST) &&
694 (ia->ia_broadaddr.sin_family == AF_INET))
695 ifra->ifra_broadaddr = ia->ia_broadaddr;
697 memset(&ifra->ifra_broadaddr, 0,
698 sizeof(ifra->ifra_broadaddr));
703 * in_ifscrub kills the interface route.
707 * in_ifadown gets rid of all the rest of
708 * the routes. This is not quite the right
709 * thing to do, but at least if we are running
710 * a routing process they will come back.
712 in_ifadown(&ia->ia_ifa, 1);
713 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
719 if (ifp == NULL || ifp->if_ioctl == NULL)
721 ifnet_serialize_all(ifp);
722 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
723 ifnet_deserialize_all(ifp);
727 KKASSERT(cmd == SIOCDIFADDR ||
728 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
730 ifa_ifunlink(&ia->ia_ifa, ifp);
733 if (cmd == SIOCDIFADDR) {
734 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
735 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
736 in_iahash_remove(ia);
741 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
742 * already taken care of the deletion from hash table
744 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
745 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
746 ("SIOC%cIFADDR failed on new ia, "
747 "but the new ia is still in hash table",
748 cmd == SIOCSIFADDR ? 'S' : 'A'));
752 ifa_destroy(&ia->ia_ifa);
754 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
755 !ifpWasUp && (ifp->if_flags & IFF_UP)) {
757 * Though the address assignment failed, the
758 * interface is brought up by in_ifinit()
759 * (via ifp->if_ioctl). With the hope that
760 * the interface has some valid addresses, we
761 * act as if IFF_UP flag was just set on the
765 * This could only be done after the failed
766 * address is unlinked from the global address
777 * SIOCGLIFADDR: get first address. (?!?)
778 * SIOCGLIFADDR with IFLR_PREFIX:
779 * get first address that matches the specified prefix.
780 * SIOCALIFADDR: add the specified address.
781 * SIOCALIFADDR with IFLR_PREFIX:
782 * EINVAL since we can't deduce hostid part of the address.
783 * SIOCDLIFADDR: delete the specified address.
784 * SIOCDLIFADDR with IFLR_PREFIX:
785 * delete the first address that matches the specified prefix.
787 * EINVAL on invalid parameters
788 * EADDRNOTAVAIL on prefix match failed/specified address not found
789 * other values may be returned from in_ioctl()
791 * NOTE! td might be NULL.
794 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
796 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
800 panic("invalid argument to in_lifaddr_ioctl");
806 /* address must be specified on GET with IFLR_PREFIX */
807 if ((iflr->flags & IFLR_PREFIX) == 0)
812 /* address must be specified on ADD and DELETE */
813 if (iflr->addr.ss_family != AF_INET)
815 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
817 /* XXX need improvement */
818 if (iflr->dstaddr.ss_family
819 && iflr->dstaddr.ss_family != AF_INET)
821 if (iflr->dstaddr.ss_family
822 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
825 default: /*shouldn't happen*/
828 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
834 struct in_aliasreq ifra;
836 if (iflr->flags & IFLR_PREFIX)
839 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
840 bzero(&ifra, sizeof ifra);
841 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
843 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
845 if (iflr->dstaddr.ss_family) { /*XXX*/
846 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
847 iflr->dstaddr.ss_len);
850 ifra.ifra_mask.sin_family = AF_INET;
851 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
852 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
854 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp,
860 struct ifaddr_container *ifac;
861 struct in_ifaddr *ia;
862 struct in_addr mask, candidate, match;
863 struct sockaddr_in *sin;
866 bzero(&mask, sizeof mask);
867 if (iflr->flags & IFLR_PREFIX) {
868 /* lookup a prefix rather than address. */
869 in_len2mask(&mask, iflr->prefixlen);
871 sin = (struct sockaddr_in *)&iflr->addr;
872 match.s_addr = sin->sin_addr.s_addr;
873 match.s_addr &= mask.s_addr;
875 /* if you set extra bits, that's wrong */
876 if (match.s_addr != sin->sin_addr.s_addr)
881 if (cmd == SIOCGLIFADDR) {
882 /* on getting an address, take the 1st match */
883 match.s_addr = 0; /* gcc4 warning */
886 /* on deleting an address, do exact match */
887 in_len2mask(&mask, 32);
888 sin = (struct sockaddr_in *)&iflr->addr;
889 match.s_addr = sin->sin_addr.s_addr;
895 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
896 struct ifaddr *ifa = ifac->ifa;
898 if (ifa->ifa_addr->sa_family != AF_INET6)
903 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
904 candidate.s_addr &= mask.s_addr;
905 if (candidate.s_addr == match.s_addr)
909 return EADDRNOTAVAIL;
910 ia = (struct in_ifaddr *)(ifac->ifa);
912 if (cmd == SIOCGLIFADDR) {
913 /* fill in the if_laddrreq structure */
914 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
916 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
917 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
918 ia->ia_dstaddr.sin_len);
920 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
923 in_mask2len(&ia->ia_sockmask.sin_addr);
925 iflr->flags = 0; /*XXX*/
929 struct in_aliasreq ifra;
931 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
932 bzero(&ifra, sizeof ifra);
933 bcopy(iflr->iflr_name, ifra.ifra_name,
934 sizeof ifra.ifra_name);
936 bcopy(&ia->ia_addr, &ifra.ifra_addr,
937 ia->ia_addr.sin_len);
938 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
939 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
940 ia->ia_dstaddr.sin_len);
942 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
943 ia->ia_sockmask.sin_len);
945 return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra,
951 return EOPNOTSUPP; /*just for safety*/
955 * Delete any existing route for an interface.
958 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
964 * Initialize an interface's internet address
965 * and routing table entry.
968 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
969 const struct sockaddr_in *sin, int scrub)
971 u_long i = ntohl(sin->sin_addr.s_addr);
972 struct sockaddr_in oldaddr;
973 struct ifaddr_container *ifac;
974 int flags = RTF_UP, error = 0;
977 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
978 oldaddr = ia->ia_addr;
980 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
982 in_iahash_remove(ia);
986 if (ia->ia_addr.sin_family == AF_INET)
987 in_iahash_insert(ia);
990 * Give the interface a chance to initialize
991 * if this is its first address,
992 * and to validate the address if necessary.
994 if (ifp->if_ioctl != NULL) {
995 ifnet_serialize_all(ifp);
996 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
997 ifnet_deserialize_all(ifp);
1003 * Delete old route, if requested.
1006 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1007 in_ifscrub(ifp, ia);
1008 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1012 * Calculate netmask/subnetmask.
1015 ia->ia_netmask = IN_CLASSA_NET;
1016 else if (IN_CLASSB(i))
1017 ia->ia_netmask = IN_CLASSB_NET;
1019 ia->ia_netmask = IN_CLASSC_NET;
1021 * The subnet mask usually includes at least the standard network part,
1022 * but may may be smaller in the case of supernetting.
1023 * If it is set, we believe it.
1025 if (ia->ia_subnetmask == 0) {
1026 ia->ia_subnetmask = ia->ia_netmask;
1027 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1029 ia->ia_netmask &= ia->ia_subnetmask;
1031 ia->ia_net = i & ia->ia_netmask;
1032 ia->ia_subnet = i & ia->ia_subnetmask;
1033 in_socktrim(&ia->ia_sockmask);
1036 * Add route for the network.
1038 ia->ia_ifa.ifa_metric = ifp->if_metric;
1039 if (ifp->if_flags & IFF_BROADCAST) {
1040 ia->ia_broadaddr.sin_addr.s_addr =
1041 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1042 ia->ia_netbroadcast.s_addr =
1043 htonl(ia->ia_net | ~ ia->ia_netmask);
1044 } else if (ifp->if_flags & IFF_LOOPBACK) {
1045 ia->ia_dstaddr = ia->ia_addr;
1047 } else if (ifp->if_flags & IFF_POINTOPOINT) {
1048 if (ia->ia_dstaddr.sin_family != AF_INET)
1054 * Don't add host routes for interface addresses of
1055 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
1056 * possible to assign several such address pairs with consistent
1057 * results (no host route) and is required by BOOTP.
1059 * XXX: This is ugly ! There should be a way for the caller to
1060 * say that they don't want a host route.
1062 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1063 ia->ia_netmask != IN_CLASSA_NET ||
1064 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1065 error = in_addprefix(ia, flags);
1071 * If the interface supports multicast, join the "all hosts"
1072 * multicast group on that interface.
1074 if (ifp->if_flags & IFF_MULTICAST) {
1075 struct in_addr addr;
1077 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1078 in_addmulti(&addr, ifp);
1082 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1083 in_iahash_remove(ia);
1085 ia->ia_addr = oldaddr;
1087 in_iahash_insert(ia);
1091 #define rtinitflags(x) \
1092 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
1096 * Add a route to prefix ("connected route" in cisco terminology).
1097 * Do nothing, if there are some interface addresses with the same
1098 * prefix already. This function assumes that the 'target' parent
1102 in_addprefix(struct in_ifaddr *target, int flags)
1104 struct in_ifaddr_container *iac;
1105 struct in_addr prefix, mask;
1110 * Don't add prefix routes for CARP interfaces.
1111 * Prefix routes creation is handled by CARP
1112 * interfaces themselves.
1114 if (target->ia_ifp->if_type == IFT_CARP)
1118 mask = target->ia_sockmask.sin_addr;
1119 if (flags & RTF_HOST) {
1120 prefix = target->ia_dstaddr.sin_addr;
1122 prefix = target->ia_addr.sin_addr;
1123 prefix.s_addr &= mask.s_addr;
1126 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1127 struct in_ifaddr *ia = iac->ia;
1130 /* Don't test against self */
1134 /* The tested address does not own a route entry */
1135 if ((ia->ia_flags & IFA_ROUTE) == 0)
1139 if (rtinitflags(ia) != 0) {
1140 p = ia->ia_dstaddr.sin_addr;
1142 p = ia->ia_addr.sin_addr;
1143 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1145 if (prefix.s_addr != p.s_addr)
1149 * If the to-be-added address and the currently being
1150 * tested address are not host addresses, we need to
1151 * take subnetmask into consideration.
1153 if (!(flags & RTF_HOST) && rtinitflags(ia) == 0 &&
1154 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1158 * If we got a matching prefix route inserted by other
1159 * interface address, we don't need to bother.
1165 * No one seem to have prefix route; insert it.
1167 error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1169 target->ia_flags |= IFA_ROUTE;
1174 * Remove a route to prefix ("connected route" in cisco terminology).
1175 * Re-installs the route by using another interface address, if there's
1176 * one with the same prefix (otherwise we lose the route mistakenly).
1179 in_scrubprefix(struct in_ifaddr *target)
1181 struct in_ifaddr_container *iac;
1182 struct in_addr prefix, mask;
1187 * Don't scrub prefix routes for CARP interfaces.
1188 * Prefix routes deletion is handled by CARP
1189 * interfaces themselves.
1191 if (target->ia_ifp->if_type == IFT_CARP)
1195 if ((target->ia_flags & IFA_ROUTE) == 0)
1198 mask = target->ia_sockmask.sin_addr;
1199 if (rtinitflags(target) != 0) {
1200 prefix = target->ia_dstaddr.sin_addr;
1202 prefix = target->ia_addr.sin_addr;
1203 prefix.s_addr &= mask.s_addr;
1206 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1207 struct in_ifaddr *ia = iac->ia;
1210 /* Don't test against self */
1214 /* The tested address already owns a route entry */
1215 if (ia->ia_flags & IFA_ROUTE)
1219 * The prefix route of the tested address should
1220 * never be installed if its parent interface is
1223 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1228 * Don't add prefix routes for CARP interfaces.
1229 * Prefix routes creation is handled by CARP
1230 * interfaces themselves.
1232 if (ia->ia_ifp->if_type == IFT_CARP)
1237 if (rtinitflags(ia) != 0) {
1238 p = ia->ia_dstaddr.sin_addr;
1240 p = ia->ia_addr.sin_addr;
1241 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1243 if (prefix.s_addr != p.s_addr)
1247 * We don't need to test subnetmask here, as what we do
1248 * in in_addprefix(), since if the the tested address's
1249 * parent interface is UP, the tested address should own
1250 * a prefix route entry and we would never reach here.
1254 * If we got a matching prefix route, move IFA_ROUTE to him
1256 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1257 target->ia_flags &= ~IFA_ROUTE;
1259 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1261 ia->ia_flags |= IFA_ROUTE;
1266 * No candidates for this prefix route; just remove it.
1268 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1269 target->ia_flags &= ~IFA_ROUTE;
1275 * Return 1 if the address might be a local broadcast address.
1278 in_broadcast(struct in_addr in, struct ifnet *ifp)
1280 struct ifaddr_container *ifac;
1283 if (in.s_addr == INADDR_BROADCAST ||
1284 in.s_addr == INADDR_ANY)
1286 if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0)
1288 t = ntohl(in.s_addr);
1290 * Look through the list of addresses for a match
1291 * with a broadcast address.
1293 #define ia ((struct in_ifaddr *)ifa)
1294 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1295 struct ifaddr *ifa = ifac->ifa;
1297 if (ifa->ifa_addr->sa_family == AF_INET &&
1298 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1299 in.s_addr == ia->ia_netbroadcast.s_addr ||
1301 * Check for old-style (host 0) broadcast.
1303 t == ia->ia_subnet || t == ia->ia_net) &&
1305 * Check for an all one subnetmask. These
1306 * only exist when an interface gets a secondary
1309 ia->ia_subnetmask != (u_long)0xffffffff)
1317 * Add an address to the list of IP multicast addresses for a given interface.
1320 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1322 struct in_multi *inm;
1324 struct sockaddr_in sin;
1325 struct ifmultiaddr *ifma;
1330 * Call generic routine to add membership or increment
1331 * refcount. It wants addresses in the form of a sockaddr,
1332 * so we build one here (being careful to zero the unused bytes).
1334 bzero(&sin, sizeof sin);
1335 sin.sin_family = AF_INET;
1336 sin.sin_len = sizeof sin;
1338 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1343 * If ifma->ifma_protospec is null, then if_addmulti() created
1344 * a new record. Otherwise, we are done.
1346 if (ifma->ifma_protospec != NULL)
1347 return ifma->ifma_protospec;
1349 inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO);
1350 inm->inm_addr = *ap;
1352 inm->inm_ifma = ifma;
1353 ifma->ifma_protospec = inm;
1354 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1357 * Let IGMP know that we have joined a new IP multicast group.
1359 igmp_joingroup(inm);
1364 * Delete a multicast address record.
1367 in_delmulti(struct in_multi *inm)
1369 struct ifmultiaddr *ifma;
1370 struct in_multi my_inm;
1374 ifma = inm->inm_ifma;
1375 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1376 if (ifma->ifma_refcount == 1) {
1378 * No remaining claims to this record; let IGMP know that
1379 * we are leaving the multicast group.
1380 * But do it after the if_delmulti() which might reset
1381 * the interface and nuke the packet.
1384 ifma->ifma_protospec = NULL;
1385 LIST_REMOVE(inm, inm_link);
1386 kfree(inm, M_IPMADDR);
1388 /* XXX - should be separate API for when we have an ifma? */
1389 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1390 if (my_inm.inm_ifp != NULL)
1391 igmp_leavegroup(&my_inm);
1395 in_if_down(struct ifnet *ifp)
1397 rt_purgecloned(ifp, AF_INET);
1401 in_ifdetach_dispatch(netmsg_t nmsg)
1403 struct lwkt_msg *lmsg = &nmsg->lmsg;
1404 struct ifnet *ifp = lmsg->u.ms_resultp;
1407 in_pcbpurgeif0(&ripcbinfo, ifp);
1408 for (cpu = 0; cpu < netisr_ncpus; ++cpu)
1409 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1411 lwkt_replymsg(lmsg, 0);
1415 in_ifdetach(struct ifnet *ifp)
1417 struct netmsg_base nmsg;
1418 struct lwkt_msg *lmsg = &nmsg.lmsg;
1420 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1421 in_ifdetach_dispatch);
1422 lmsg->u.ms_resultp = ifp;
1424 lwkt_domsg(netisr_cpuport(0), lmsg, 0);