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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)in.c 8.4 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
35 * $DragonFly: src/sys/netinet/in.c,v 1.34 2008/05/24 08:04:42 sephe Exp $
38 #include "opt_bootp.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sockio.h>
43 #include <sys/malloc.h>
45 #include <sys/msgport.h>
46 #include <sys/socket.h>
48 #include <sys/kernel.h>
49 #include <sys/sysctl.h>
50 #include <sys/thread2.h>
53 #include <net/if_types.h>
54 #include <net/route.h>
55 #include <net/netmsg2.h>
57 #include <netinet/in.h>
58 #include <netinet/in_var.h>
59 #include <netinet/in_pcb.h>
61 #include <netinet/igmp_var.h>
63 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
65 static int in_mask2len (struct in_addr *);
66 static void in_len2mask (struct in_addr *, int);
67 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t,
68 struct ifnet *, struct thread *);
70 static void in_socktrim (struct sockaddr_in *);
71 static int in_ifinit (struct ifnet *,
72 struct in_ifaddr *, struct sockaddr_in *, int);
74 static void in_control_dispatch(struct netmsg *);
75 static int in_control_internal(u_long, caddr_t, struct ifnet *,
78 static int subnetsarelocal = 0;
79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
80 &subnetsarelocal, 0, "");
82 struct in_multihead in_multihead; /* XXX BSS initialization */
84 extern struct inpcbinfo ripcbinfo;
85 extern struct inpcbinfo udbinfo;
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);
99 if (subnetsarelocal) {
100 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
101 if ((i & ia->ia_netmask) == ia->ia_net)
104 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
105 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
112 * Determine whether an IP address is in a reserved set of addresses
113 * that may not be forwarded, or whether datagrams to that destination
117 in_canforward(struct in_addr in)
119 u_long i = ntohl(in.s_addr);
122 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
125 net = i & IN_CLASSA_NET;
126 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
133 * Trim a mask in a sockaddr
136 in_socktrim(struct sockaddr_in *ap)
138 char *cplim = (char *) &ap->sin_addr;
139 char *cp = (char *) (&ap->sin_addr + 1);
142 while (--cp >= cplim)
144 (ap)->sin_len = cp - (char *) (ap) + 1;
150 in_mask2len(struct in_addr *mask)
156 for (x = 0; x < sizeof *mask; x++) {
161 if (x < sizeof *mask) {
162 for (y = 0; y < 8; y++) {
163 if ((p[x] & (0x80 >> y)) == 0)
171 in_len2mask(struct in_addr *mask, int len)
177 bzero(mask, sizeof *mask);
178 for (i = 0; i < len / 8; i++)
181 p[i] = (0xff00 >> (len % 8)) & 0xff;
184 static int in_interfaces; /* number of external internet interfaces */
186 struct in_control_arg {
194 in_control_dispatch(struct netmsg *nmsg)
196 struct lwkt_msg *msg = &nmsg->nm_lmsg;
197 const struct in_control_arg *arg = msg->u.ms_resultp;
200 error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td);
201 lwkt_replymsg(msg, error);
205 * Generic internet control operations (ioctl's).
206 * Ifp is 0 if not an interface-specific ioctl.
208 * NOTE! td might be NULL.
212 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
216 struct in_control_arg arg;
217 struct lwkt_msg *msg;
223 if (td && (error = suser(td)) != 0)
229 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
232 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR,
233 ("recursive SIOC%cLIFADDR!\n",
234 cmd == SIOCDLIFADDR ? 'D' : 'A'));
237 * IFADDR alterations are serialized by netisr0
246 bzero(&arg, sizeof(arg));
252 netmsg_init(&nmsg, &curthread->td_msgport, 0,
253 in_control_dispatch);
255 msg->u.ms_resultp = &arg;
257 lwkt_domsg(cpu_portfn(0), msg, 0);
258 return msg->ms_error;
260 return in_control_internal(cmd, data, ifp, td);
265 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
268 struct ifreq *ifr = (struct ifreq *)data;
269 struct in_ifaddr *ia = 0, *iap;
271 struct in_ifaddr *oia;
272 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
273 struct sockaddr_in oldaddr;
274 int hostIsNew, iaIsNew, maskIsNew;
280 * Find address for this interface, if it exists.
282 * If an alias address was specified, find that one instead of
283 * the first one on the interface, if possible
286 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
287 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
288 if (iap->ia_ifp == ifp &&
289 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
294 struct ifaddr_container *ifac;
296 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
298 iap = ifatoia(ifac->ifa);
299 if (iap->ia_addr.sin_family == AF_INET) {
311 return (EADDRNOTAVAIL);
312 if (ifra->ifra_addr.sin_family == AF_INET) {
313 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
314 if (ia->ia_ifp == ifp &&
315 ia->ia_addr.sin_addr.s_addr ==
316 ifra->ifra_addr.sin_addr.s_addr)
319 if ((ifp->if_flags & IFF_POINTOPOINT) &&
320 cmd == SIOCAIFADDR &&
321 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
325 if (cmd == SIOCDIFADDR && ia == NULL)
326 return (EADDRNOTAVAIL);
331 if (td && (error = suser(td)) != 0)
335 return (EADDRNOTAVAIL);
337 if (cmd == SIOCSIFDSTADDR &&
338 (ifp->if_flags & IFF_POINTOPOINT) == 0)
344 ia = ifa_create(sizeof(*ia), M_WAITOK);
347 * Protect from NETISR_IP traversing address list
348 * while we're modifying it.
352 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
354 ifa_iflink(ifa, ifp, 1);
356 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
357 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
358 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
359 ia->ia_sockmask.sin_len = 8;
360 ia->ia_sockmask.sin_family = AF_INET;
361 if (ifp->if_flags & IFF_BROADCAST) {
362 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
363 ia->ia_broadaddr.sin_family = AF_INET;
366 if (!(ifp->if_flags & IFF_LOOPBACK))
375 if (td && (error = suser(td)) != 0)
384 return (EADDRNOTAVAIL);
390 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
394 if ((ifp->if_flags & IFF_BROADCAST) == 0)
396 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
400 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
402 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
406 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
410 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
412 oldaddr = ia->ia_dstaddr;
413 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
414 if (ifp->if_ioctl != NULL) {
415 lwkt_serialize_enter(ifp->if_serializer);
416 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
417 td->td_proc->p_ucred);
418 lwkt_serialize_exit(ifp->if_serializer);
420 ia->ia_dstaddr = oldaddr;
424 if (ia->ia_flags & IFA_ROUTE) {
425 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
426 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
427 ia->ia_ifa.ifa_dstaddr =
428 (struct sockaddr *)&ia->ia_dstaddr;
429 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
434 if ((ifp->if_flags & IFF_BROADCAST) == 0)
436 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
440 error = in_ifinit(ifp, ia,
441 (struct sockaddr_in *) &ifr->ifr_addr, 1);
442 if (error != 0 && iaIsNew)
445 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
449 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
450 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
457 if (ia->ia_addr.sin_family == AF_INET) {
458 if (ifra->ifra_addr.sin_len == 0) {
459 ifra->ifra_addr = ia->ia_addr;
461 } else if (ifra->ifra_addr.sin_addr.s_addr ==
462 ia->ia_addr.sin_addr.s_addr) {
466 if (ifra->ifra_mask.sin_len) {
468 ia->ia_sockmask = ifra->ifra_mask;
469 ia->ia_sockmask.sin_family = AF_INET;
471 ntohl(ia->ia_sockmask.sin_addr.s_addr);
474 if ((ifp->if_flags & IFF_POINTOPOINT) &&
475 ifra->ifra_dstaddr.sin_family == AF_INET) {
477 ia->ia_dstaddr = ifra->ifra_dstaddr;
478 maskIsNew = 1; /* We lie; but the effect's the same */
480 if (ifra->ifra_addr.sin_family == AF_INET &&
481 (hostIsNew || maskIsNew))
482 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
484 if (error != 0 && iaIsNew)
487 if ((ifp->if_flags & IFF_BROADCAST) &&
488 ifra->ifra_broadaddr.sin_family == AF_INET)
489 ia->ia_broadaddr = ifra->ifra_broadaddr;
491 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
496 * in_ifscrub kills the interface route.
500 * in_ifadown gets rid of all the rest of
501 * the routes. This is not quite the right
502 * thing to do, but at least if we are running
503 * a routing process they will come back.
505 in_ifadown(&ia->ia_ifa, 1);
506 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
511 if (ifp == NULL || ifp->if_ioctl == NULL)
513 lwkt_serialize_enter(ifp->if_serializer);
514 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
515 lwkt_serialize_exit(ifp->if_serializer);
519 ifa_ifunlink(&ia->ia_ifa, ifp);
522 * Protect from NETISR_IP traversing address list while we're modifying
525 crit_enter(); /* XXX MP */
526 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
527 LIST_REMOVE(ia, ia_hash);
528 crit_exit(); /* XXX MP */
530 ifa_destroy(&ia->ia_ifa);
537 * SIOCGLIFADDR: get first address. (?!?)
538 * SIOCGLIFADDR with IFLR_PREFIX:
539 * get first address that matches the specified prefix.
540 * SIOCALIFADDR: add the specified address.
541 * SIOCALIFADDR with IFLR_PREFIX:
542 * EINVAL since we can't deduce hostid part of the address.
543 * SIOCDLIFADDR: delete the specified address.
544 * SIOCDLIFADDR with IFLR_PREFIX:
545 * delete the first address that matches the specified prefix.
547 * EINVAL on invalid parameters
548 * EADDRNOTAVAIL on prefix match failed/specified address not found
549 * other values may be returned from in_ioctl()
551 * NOTE! td might be NULL.
554 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
557 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
561 panic("invalid argument to in_lifaddr_ioctl");
567 /* address must be specified on GET with IFLR_PREFIX */
568 if ((iflr->flags & IFLR_PREFIX) == 0)
573 /* address must be specified on ADD and DELETE */
574 if (iflr->addr.ss_family != AF_INET)
576 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
578 /* XXX need improvement */
579 if (iflr->dstaddr.ss_family
580 && iflr->dstaddr.ss_family != AF_INET)
582 if (iflr->dstaddr.ss_family
583 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
586 default: /*shouldn't happen*/
589 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
595 struct in_aliasreq ifra;
597 if (iflr->flags & IFLR_PREFIX)
600 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
601 bzero(&ifra, sizeof ifra);
602 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
604 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
606 if (iflr->dstaddr.ss_family) { /*XXX*/
607 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
608 iflr->dstaddr.ss_len);
611 ifra.ifra_mask.sin_family = AF_INET;
612 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
613 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
615 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
620 struct ifaddr_container *ifac;
621 struct in_ifaddr *ia;
622 struct in_addr mask, candidate, match;
623 struct sockaddr_in *sin;
626 bzero(&mask, sizeof mask);
627 if (iflr->flags & IFLR_PREFIX) {
628 /* lookup a prefix rather than address. */
629 in_len2mask(&mask, iflr->prefixlen);
631 sin = (struct sockaddr_in *)&iflr->addr;
632 match.s_addr = sin->sin_addr.s_addr;
633 match.s_addr &= mask.s_addr;
635 /* if you set extra bits, that's wrong */
636 if (match.s_addr != sin->sin_addr.s_addr)
641 if (cmd == SIOCGLIFADDR) {
642 /* on getting an address, take the 1st match */
643 match.s_addr = 0; /* gcc4 warning */
646 /* on deleting an address, do exact match */
647 in_len2mask(&mask, 32);
648 sin = (struct sockaddr_in *)&iflr->addr;
649 match.s_addr = sin->sin_addr.s_addr;
655 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
656 struct ifaddr *ifa = ifac->ifa;
658 if (ifa->ifa_addr->sa_family != AF_INET6)
663 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
664 candidate.s_addr &= mask.s_addr;
665 if (candidate.s_addr == match.s_addr)
669 return EADDRNOTAVAIL;
670 ia = (struct in_ifaddr *)(ifac->ifa);
672 if (cmd == SIOCGLIFADDR) {
673 /* fill in the if_laddrreq structure */
674 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
676 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
677 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
678 ia->ia_dstaddr.sin_len);
680 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
683 in_mask2len(&ia->ia_sockmask.sin_addr);
685 iflr->flags = 0; /*XXX*/
689 struct in_aliasreq ifra;
691 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
692 bzero(&ifra, sizeof ifra);
693 bcopy(iflr->iflr_name, ifra.ifra_name,
694 sizeof ifra.ifra_name);
696 bcopy(&ia->ia_addr, &ifra.ifra_addr,
697 ia->ia_addr.sin_len);
698 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
699 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
700 ia->ia_dstaddr.sin_len);
702 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
703 ia->ia_sockmask.sin_len);
705 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
711 return EOPNOTSUPP; /*just for safety*/
715 * Delete any existing route for an interface.
718 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
721 if ((ia->ia_flags & IFA_ROUTE) == 0)
723 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
724 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
726 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
727 ia->ia_flags &= ~IFA_ROUTE;
731 * Initialize an interface's internet address
732 * and routing table entry.
735 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub)
737 u_long i = ntohl(sin->sin_addr.s_addr);
738 struct sockaddr_in oldaddr;
739 int flags = RTF_UP, error = 0;
742 oldaddr = ia->ia_addr;
743 if (oldaddr.sin_family == AF_INET)
744 LIST_REMOVE(ia, ia_hash);
747 if (ia->ia_addr.sin_family == AF_INET) {
748 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
754 * Give the interface a chance to initialize
755 * if this is its first address,
756 * and to validate the address if necessary.
758 if (ifp->if_ioctl != NULL) {
759 lwkt_serialize_enter(ifp->if_serializer);
760 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
761 lwkt_serialize_exit(ifp->if_serializer);
763 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
764 ia->ia_addr = oldaddr;
765 if (ia->ia_addr.sin_family == AF_INET) {
768 INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
777 * Delete old route, if requested.
780 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
782 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
786 * Calculate netmask/subnetmask.
789 ia->ia_netmask = IN_CLASSA_NET;
790 else if (IN_CLASSB(i))
791 ia->ia_netmask = IN_CLASSB_NET;
793 ia->ia_netmask = IN_CLASSC_NET;
795 * The subnet mask usually includes at least the standard network part,
796 * but may may be smaller in the case of supernetting.
797 * If it is set, we believe it.
799 if (ia->ia_subnetmask == 0) {
800 ia->ia_subnetmask = ia->ia_netmask;
801 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
803 ia->ia_netmask &= ia->ia_subnetmask;
805 ia->ia_net = i & ia->ia_netmask;
806 ia->ia_subnet = i & ia->ia_subnetmask;
807 in_socktrim(&ia->ia_sockmask);
810 * Add route for the network.
812 ia->ia_ifa.ifa_metric = ifp->if_metric;
813 if (ifp->if_flags & IFF_BROADCAST) {
814 ia->ia_broadaddr.sin_addr.s_addr =
815 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
816 ia->ia_netbroadcast.s_addr =
817 htonl(ia->ia_net | ~ ia->ia_netmask);
818 } else if (ifp->if_flags & IFF_LOOPBACK) {
819 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
821 } else if (ifp->if_flags & IFF_POINTOPOINT) {
822 if (ia->ia_dstaddr.sin_family != AF_INET)
828 * Don't add host routes for interface addresses of
829 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
830 * possible to assign several such address pairs with consistent
831 * results (no host route) and is required by BOOTP.
833 * XXX: This is ugly ! There should be a way for the caller to
834 * say that they don't want a host route.
836 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
837 ia->ia_netmask != IN_CLASSA_NET ||
838 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
839 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, flags)) != 0) {
840 ia->ia_addr = oldaddr;
843 ia->ia_flags |= IFA_ROUTE;
847 * If the interface supports multicast, join the "all hosts"
848 * multicast group on that interface.
850 if (ifp->if_flags & IFF_MULTICAST) {
853 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
854 in_addmulti(&addr, ifp);
861 * Return 1 if the address might be a local broadcast address.
864 in_broadcast(struct in_addr in, struct ifnet *ifp)
866 struct ifaddr_container *ifac;
869 if (in.s_addr == INADDR_BROADCAST ||
870 in.s_addr == INADDR_ANY)
872 if ((ifp->if_flags & IFF_BROADCAST) == 0)
874 t = ntohl(in.s_addr);
876 * Look through the list of addresses for a match
877 * with a broadcast address.
879 #define ia ((struct in_ifaddr *)ifa)
880 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
881 struct ifaddr *ifa = ifac->ifa;
883 if (ifa->ifa_addr->sa_family == AF_INET &&
884 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
885 in.s_addr == ia->ia_netbroadcast.s_addr ||
887 * Check for old-style (host 0) broadcast.
889 t == ia->ia_subnet || t == ia->ia_net) &&
891 * Check for an all one subnetmask. These
892 * only exist when an interface gets a secondary
895 ia->ia_subnetmask != (u_long)0xffffffff)
902 * Add an address to the list of IP multicast addresses for a given interface.
905 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
907 struct in_multi *inm;
909 struct sockaddr_in sin;
910 struct ifmultiaddr *ifma;
913 * Call generic routine to add membership or increment
914 * refcount. It wants addresses in the form of a sockaddr,
915 * so we build one here (being careful to zero the unused bytes).
917 bzero(&sin, sizeof sin);
918 sin.sin_family = AF_INET;
919 sin.sin_len = sizeof sin;
922 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
929 * If ifma->ifma_protospec is null, then if_addmulti() created
930 * a new record. Otherwise, we are done.
932 if (ifma->ifma_protospec != 0) {
934 return ifma->ifma_protospec;
937 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
938 at interrupt time? If so, need to fix if_addmulti. XXX */
939 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
942 inm->inm_ifma = ifma;
943 ifma->ifma_protospec = inm;
944 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
947 * Let IGMP know that we have joined a new IP multicast group.
955 * Delete a multicast address record.
958 in_delmulti(struct in_multi *inm)
960 struct ifmultiaddr *ifma;
961 struct in_multi my_inm;
964 ifma = inm->inm_ifma;
965 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
966 if (ifma->ifma_refcount == 1) {
968 * No remaining claims to this record; let IGMP know that
969 * we are leaving the multicast group.
970 * But do it after the if_delmulti() which might reset
971 * the interface and nuke the packet.
974 ifma->ifma_protospec = 0;
975 LIST_REMOVE(inm, inm_link);
976 kfree(inm, M_IPMADDR);
978 /* XXX - should be separate API for when we have an ifma? */
979 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
980 if (my_inm.inm_ifp != NULL)
981 igmp_leavegroup(&my_inm);
986 in_ifdetach(struct ifnet *ifp)
988 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
989 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);