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 1.35 2008/05/26 13:29:33 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 *, struct in_ifaddr *,
72 const 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 (const 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 if (cmd == SIOCDIFADDR && ia->ia_addr.sin_family == AF_INET) {
528 /* XXX Assume that 'ia' is in hash table */
529 LIST_REMOVE(ia, ia_hash);
531 crit_exit(); /* XXX MP */
533 ifa_destroy(&ia->ia_ifa);
540 * SIOCGLIFADDR: get first address. (?!?)
541 * SIOCGLIFADDR with IFLR_PREFIX:
542 * get first address that matches the specified prefix.
543 * SIOCALIFADDR: add the specified address.
544 * SIOCALIFADDR with IFLR_PREFIX:
545 * EINVAL since we can't deduce hostid part of the address.
546 * SIOCDLIFADDR: delete the specified address.
547 * SIOCDLIFADDR with IFLR_PREFIX:
548 * delete the first address that matches the specified prefix.
550 * EINVAL on invalid parameters
551 * EADDRNOTAVAIL on prefix match failed/specified address not found
552 * other values may be returned from in_ioctl()
554 * NOTE! td might be NULL.
557 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
560 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
564 panic("invalid argument to in_lifaddr_ioctl");
570 /* address must be specified on GET with IFLR_PREFIX */
571 if ((iflr->flags & IFLR_PREFIX) == 0)
576 /* address must be specified on ADD and DELETE */
577 if (iflr->addr.ss_family != AF_INET)
579 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
581 /* XXX need improvement */
582 if (iflr->dstaddr.ss_family
583 && iflr->dstaddr.ss_family != AF_INET)
585 if (iflr->dstaddr.ss_family
586 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
589 default: /*shouldn't happen*/
592 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
598 struct in_aliasreq ifra;
600 if (iflr->flags & IFLR_PREFIX)
603 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
604 bzero(&ifra, sizeof ifra);
605 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
607 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
609 if (iflr->dstaddr.ss_family) { /*XXX*/
610 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
611 iflr->dstaddr.ss_len);
614 ifra.ifra_mask.sin_family = AF_INET;
615 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
616 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
618 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
623 struct ifaddr_container *ifac;
624 struct in_ifaddr *ia;
625 struct in_addr mask, candidate, match;
626 struct sockaddr_in *sin;
629 bzero(&mask, sizeof mask);
630 if (iflr->flags & IFLR_PREFIX) {
631 /* lookup a prefix rather than address. */
632 in_len2mask(&mask, iflr->prefixlen);
634 sin = (struct sockaddr_in *)&iflr->addr;
635 match.s_addr = sin->sin_addr.s_addr;
636 match.s_addr &= mask.s_addr;
638 /* if you set extra bits, that's wrong */
639 if (match.s_addr != sin->sin_addr.s_addr)
644 if (cmd == SIOCGLIFADDR) {
645 /* on getting an address, take the 1st match */
646 match.s_addr = 0; /* gcc4 warning */
649 /* on deleting an address, do exact match */
650 in_len2mask(&mask, 32);
651 sin = (struct sockaddr_in *)&iflr->addr;
652 match.s_addr = sin->sin_addr.s_addr;
658 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
659 struct ifaddr *ifa = ifac->ifa;
661 if (ifa->ifa_addr->sa_family != AF_INET6)
666 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
667 candidate.s_addr &= mask.s_addr;
668 if (candidate.s_addr == match.s_addr)
672 return EADDRNOTAVAIL;
673 ia = (struct in_ifaddr *)(ifac->ifa);
675 if (cmd == SIOCGLIFADDR) {
676 /* fill in the if_laddrreq structure */
677 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
679 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
680 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
681 ia->ia_dstaddr.sin_len);
683 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
686 in_mask2len(&ia->ia_sockmask.sin_addr);
688 iflr->flags = 0; /*XXX*/
692 struct in_aliasreq ifra;
694 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
695 bzero(&ifra, sizeof ifra);
696 bcopy(iflr->iflr_name, ifra.ifra_name,
697 sizeof ifra.ifra_name);
699 bcopy(&ia->ia_addr, &ifra.ifra_addr,
700 ia->ia_addr.sin_len);
701 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
702 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
703 ia->ia_dstaddr.sin_len);
705 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
706 ia->ia_sockmask.sin_len);
708 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
714 return EOPNOTSUPP; /*just for safety*/
718 * Delete any existing route for an interface.
721 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
724 if ((ia->ia_flags & IFA_ROUTE) == 0)
726 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
727 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
729 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
730 ia->ia_flags &= ~IFA_ROUTE;
734 * Initialize an interface's internet address
735 * and routing table entry.
738 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
739 const struct sockaddr_in *sin, int scrub)
741 u_long i = ntohl(sin->sin_addr.s_addr);
742 struct sockaddr_in oldaddr;
743 int flags = RTF_UP, error = 0;
744 int old_hash = 0, new_hash = 0;
747 oldaddr = ia->ia_addr;
748 if (oldaddr.sin_family == AF_INET) {
750 LIST_REMOVE(ia, ia_hash);
754 if (ia->ia_addr.sin_family == AF_INET) {
756 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
762 * Give the interface a chance to initialize
763 * if this is its first address,
764 * and to validate the address if necessary.
766 if (ifp->if_ioctl != NULL) {
767 lwkt_serialize_enter(ifp->if_serializer);
768 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
769 lwkt_serialize_exit(ifp->if_serializer);
775 * Delete old route, if requested.
778 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
780 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
784 * Calculate netmask/subnetmask.
787 ia->ia_netmask = IN_CLASSA_NET;
788 else if (IN_CLASSB(i))
789 ia->ia_netmask = IN_CLASSB_NET;
791 ia->ia_netmask = IN_CLASSC_NET;
793 * The subnet mask usually includes at least the standard network part,
794 * but may may be smaller in the case of supernetting.
795 * If it is set, we believe it.
797 if (ia->ia_subnetmask == 0) {
798 ia->ia_subnetmask = ia->ia_netmask;
799 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
801 ia->ia_netmask &= ia->ia_subnetmask;
803 ia->ia_net = i & ia->ia_netmask;
804 ia->ia_subnet = i & ia->ia_subnetmask;
805 in_socktrim(&ia->ia_sockmask);
808 * Add route for the network.
810 ia->ia_ifa.ifa_metric = ifp->if_metric;
811 if (ifp->if_flags & IFF_BROADCAST) {
812 ia->ia_broadaddr.sin_addr.s_addr =
813 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
814 ia->ia_netbroadcast.s_addr =
815 htonl(ia->ia_net | ~ ia->ia_netmask);
816 } else if (ifp->if_flags & IFF_LOOPBACK) {
817 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
819 } else if (ifp->if_flags & IFF_POINTOPOINT) {
820 if (ia->ia_dstaddr.sin_family != AF_INET)
826 * Don't add host routes for interface addresses of
827 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
828 * possible to assign several such address pairs with consistent
829 * results (no host route) and is required by BOOTP.
831 * XXX: This is ugly ! There should be a way for the caller to
832 * say that they don't want a host route.
834 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
835 ia->ia_netmask != IN_CLASSA_NET ||
836 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
837 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, flags)) != 0)
839 ia->ia_flags |= IFA_ROUTE;
843 * If the interface supports multicast, join the "all hosts"
844 * multicast group on that interface.
846 if (ifp->if_flags & IFF_MULTICAST) {
849 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
850 in_addmulti(&addr, ifp);
856 LIST_REMOVE(ia, ia_hash);
858 ia->ia_addr = oldaddr;
860 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
869 * Return 1 if the address might be a local broadcast address.
872 in_broadcast(struct in_addr in, struct ifnet *ifp)
874 struct ifaddr_container *ifac;
877 if (in.s_addr == INADDR_BROADCAST ||
878 in.s_addr == INADDR_ANY)
880 if ((ifp->if_flags & IFF_BROADCAST) == 0)
882 t = ntohl(in.s_addr);
884 * Look through the list of addresses for a match
885 * with a broadcast address.
887 #define ia ((struct in_ifaddr *)ifa)
888 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
889 struct ifaddr *ifa = ifac->ifa;
891 if (ifa->ifa_addr->sa_family == AF_INET &&
892 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
893 in.s_addr == ia->ia_netbroadcast.s_addr ||
895 * Check for old-style (host 0) broadcast.
897 t == ia->ia_subnet || t == ia->ia_net) &&
899 * Check for an all one subnetmask. These
900 * only exist when an interface gets a secondary
903 ia->ia_subnetmask != (u_long)0xffffffff)
910 * Add an address to the list of IP multicast addresses for a given interface.
913 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
915 struct in_multi *inm;
917 struct sockaddr_in sin;
918 struct ifmultiaddr *ifma;
921 * Call generic routine to add membership or increment
922 * refcount. It wants addresses in the form of a sockaddr,
923 * so we build one here (being careful to zero the unused bytes).
925 bzero(&sin, sizeof sin);
926 sin.sin_family = AF_INET;
927 sin.sin_len = sizeof sin;
930 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
937 * If ifma->ifma_protospec is null, then if_addmulti() created
938 * a new record. Otherwise, we are done.
940 if (ifma->ifma_protospec != 0) {
942 return ifma->ifma_protospec;
945 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
946 at interrupt time? If so, need to fix if_addmulti. XXX */
947 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
950 inm->inm_ifma = ifma;
951 ifma->ifma_protospec = inm;
952 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
955 * Let IGMP know that we have joined a new IP multicast group.
963 * Delete a multicast address record.
966 in_delmulti(struct in_multi *inm)
968 struct ifmultiaddr *ifma;
969 struct in_multi my_inm;
972 ifma = inm->inm_ifma;
973 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
974 if (ifma->ifma_refcount == 1) {
976 * No remaining claims to this record; let IGMP know that
977 * we are leaving the multicast group.
978 * But do it after the if_delmulti() which might reset
979 * the interface and nuke the packet.
982 ifma->ifma_protospec = 0;
983 LIST_REMOVE(inm, inm_link);
984 kfree(inm, M_IPMADDR);
986 /* XXX - should be separate API for when we have an ifma? */
987 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
988 if (my_inm.inm_ifp != NULL)
989 igmp_leavegroup(&my_inm);
994 in_ifdetach(struct ifnet *ifp)
996 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
997 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);