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
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/sockio.h>
40 #include <sys/malloc.h>
41 #include <sys/socket.h>
42 #include <sys/kernel.h>
43 #include <sys/sysctl.h>
46 #include <net/if_types.h>
47 #include <net/route.h>
49 #include <netinet/in.h>
50 #include <netinet/in_var.h>
51 #include <netinet/in_pcb.h>
53 #include <netinet/igmp_var.h>
55 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
57 static int in_mask2len(struct in_addr *);
58 static void in_len2mask(struct in_addr *, int);
59 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
60 struct ifnet *, struct thread *);
62 static void in_socktrim(struct sockaddr_in *);
63 static int in_ifinit(struct ifnet *,
64 struct in_ifaddr *, struct sockaddr_in *, int);
66 static int subnetsarelocal = 0;
67 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
68 &subnetsarelocal, 0, "");
70 struct in_multihead in_multihead; /* XXX BSS initialization */
72 extern struct inpcbinfo ripcbinfo;
73 extern struct inpcbinfo udbinfo;
76 * Return 1 if an internet address is for a ``local'' host
77 * (one to which we have a connection). If subnetsarelocal
78 * is true, this includes other subnets of the local net.
79 * Otherwise, it includes only the directly-connected (sub)nets.
85 register u_long i = ntohl(in.s_addr);
86 register struct in_ifaddr *ia;
88 if (subnetsarelocal) {
89 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
90 if ((i & ia->ia_netmask) == ia->ia_net)
93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
94 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
101 * Determine whether an IP address is in a reserved set of addresses
102 * that may not be forwarded, or whether datagrams to that destination
109 register u_long i = ntohl(in.s_addr);
112 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
115 net = i & IN_CLASSA_NET;
116 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
123 * Trim a mask in a sockaddr
127 struct sockaddr_in *ap;
129 register char *cplim = (char *) &ap->sin_addr;
130 register char *cp = (char *) (&ap->sin_addr + 1);
133 while (--cp >= cplim)
135 (ap)->sin_len = cp - (char *) (ap) + 1;
142 struct in_addr *mask;
148 for (x = 0; x < sizeof(*mask); x++) {
153 if (x < sizeof(*mask)) {
154 for (y = 0; y < 8; y++) {
155 if ((p[x] & (0x80 >> y)) == 0)
163 in_len2mask(mask, len)
164 struct in_addr *mask;
171 bzero(mask, sizeof(*mask));
172 for (i = 0; i < len / 8; i++)
175 p[i] = (0xff00 >> (len % 8)) & 0xff;
178 static int in_interfaces; /* number of external internet interfaces */
181 * Generic internet control operations (ioctl's).
182 * Ifp is 0 if not an interface-specific ioctl.
186 in_control(so, cmd, data, ifp, td)
190 register struct ifnet *ifp;
193 register struct ifreq *ifr = (struct ifreq *)data;
194 register struct in_ifaddr *ia = 0, *iap;
195 register struct ifaddr *ifa;
197 struct in_ifaddr *oia;
198 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
199 struct sockaddr_in oldaddr;
200 int error, hostIsNew, iaIsNew, maskIsNew, s;
207 if (td && (error = suser(td)) != 0)
213 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
217 * Find address for this interface, if it exists.
219 * If an alias address was specified, find that one instead of
220 * the first one on the interface, if possible.
223 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
224 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
225 if (iap->ia_ifp == ifp &&
226 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
231 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
233 if (iap->ia_addr.sin_family == AF_INET) {
245 return (EADDRNOTAVAIL);
246 if (ifra->ifra_addr.sin_family == AF_INET) {
247 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
248 if (ia->ia_ifp == ifp &&
249 ia->ia_addr.sin_addr.s_addr ==
250 ifra->ifra_addr.sin_addr.s_addr)
253 if ((ifp->if_flags & IFF_POINTOPOINT)
254 && (cmd == SIOCAIFADDR)
255 && (ifra->ifra_dstaddr.sin_addr.s_addr
260 if (cmd == SIOCDIFADDR && ia == 0)
261 return (EADDRNOTAVAIL);
266 if (td && (error = suser(td)) != 0)
270 return (EADDRNOTAVAIL);
271 if (ia == (struct in_ifaddr *)0) {
272 ia = (struct in_ifaddr *)
273 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
274 if (ia == (struct in_ifaddr *)NULL)
277 * Protect from ipintr() traversing address list
278 * while we're modifying it.
282 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
284 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
286 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
287 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
288 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
289 ia->ia_sockmask.sin_len = 8;
290 ia->ia_sockmask.sin_family = AF_INET;
291 if (ifp->if_flags & IFF_BROADCAST) {
292 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
293 ia->ia_broadaddr.sin_family = AF_INET;
296 if (!(ifp->if_flags & IFF_LOOPBACK))
304 if (td && (error = suser(td)) != 0)
312 if (ia == (struct in_ifaddr *)0)
313 return (EADDRNOTAVAIL);
319 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
323 if ((ifp->if_flags & IFF_BROADCAST) == 0)
325 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
329 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
331 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
335 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
339 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
341 oldaddr = ia->ia_dstaddr;
342 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
343 if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
344 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
345 ia->ia_dstaddr = oldaddr;
348 if (ia->ia_flags & IFA_ROUTE) {
349 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
350 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
351 ia->ia_ifa.ifa_dstaddr =
352 (struct sockaddr *)&ia->ia_dstaddr;
353 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
358 if ((ifp->if_flags & IFF_BROADCAST) == 0)
360 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
364 error = in_ifinit(ifp, ia,
365 (struct sockaddr_in *) &ifr->ifr_addr, 1);
366 if (error != 0 && iaIsNew)
371 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
372 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
379 if (ia->ia_addr.sin_family == AF_INET) {
380 if (ifra->ifra_addr.sin_len == 0) {
381 ifra->ifra_addr = ia->ia_addr;
383 } else if (ifra->ifra_addr.sin_addr.s_addr ==
384 ia->ia_addr.sin_addr.s_addr)
387 if (ifra->ifra_mask.sin_len) {
389 ia->ia_sockmask = ifra->ifra_mask;
390 ia->ia_sockmask.sin_family = AF_INET;
392 ntohl(ia->ia_sockmask.sin_addr.s_addr);
395 if ((ifp->if_flags & IFF_POINTOPOINT) &&
396 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
398 ia->ia_dstaddr = ifra->ifra_dstaddr;
399 maskIsNew = 1; /* We lie; but the effect's the same */
401 if (ifra->ifra_addr.sin_family == AF_INET &&
402 (hostIsNew || maskIsNew))
403 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
404 if (error != 0 && iaIsNew)
407 if ((ifp->if_flags & IFF_BROADCAST) &&
408 (ifra->ifra_broadaddr.sin_family == AF_INET))
409 ia->ia_broadaddr = ifra->ifra_broadaddr;
414 * in_ifscrub kills the interface route.
418 * in_ifadown gets rid of all the rest of
419 * the routes. This is not quite the right
420 * thing to do, but at least if we are running
421 * a routing process they will come back.
423 in_ifadown(&ia->ia_ifa, 1);
425 * XXX horrible hack to detect that we are being called
428 if (ifaddr_byindex(ifp->if_index) != NULL) {
429 in_pcbpurgeif0(&ripcbinfo, ifp);
430 in_pcbpurgeif0(&udbinfo, ifp);
436 if (ifp == 0 || ifp->if_ioctl == 0)
438 return ((*ifp->if_ioctl)(ifp, cmd, data));
442 * Protect from ipintr() traversing address list while we're modifying
446 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
447 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
448 LIST_REMOVE(ia, ia_hash);
449 IFAFREE(&ia->ia_ifa);
457 * SIOCGLIFADDR: get first address. (?!?)
458 * SIOCGLIFADDR with IFLR_PREFIX:
459 * get first address that matches the specified prefix.
460 * SIOCALIFADDR: add the specified address.
461 * SIOCALIFADDR with IFLR_PREFIX:
462 * EINVAL since we can't deduce hostid part of the address.
463 * SIOCDLIFADDR: delete the specified address.
464 * SIOCDLIFADDR with IFLR_PREFIX:
465 * delete the first address that matches the specified prefix.
467 * EINVAL on invalid parameters
468 * EADDRNOTAVAIL on prefix match failed/specified address not found
469 * other values may be returned from in_ioctl()
472 in_lifaddr_ioctl(so, cmd, data, ifp, td)
479 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
484 panic("invalid argument to in_lifaddr_ioctl");
490 /* address must be specified on GET with IFLR_PREFIX */
491 if ((iflr->flags & IFLR_PREFIX) == 0)
496 /* address must be specified on ADD and DELETE */
497 if (iflr->addr.ss_family != AF_INET)
499 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
501 /* XXX need improvement */
502 if (iflr->dstaddr.ss_family
503 && iflr->dstaddr.ss_family != AF_INET)
505 if (iflr->dstaddr.ss_family
506 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
509 default: /*shouldn't happen*/
512 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
518 struct in_aliasreq ifra;
520 if (iflr->flags & IFLR_PREFIX)
523 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
524 bzero(&ifra, sizeof(ifra));
525 bcopy(iflr->iflr_name, ifra.ifra_name,
526 sizeof(ifra.ifra_name));
528 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
530 if (iflr->dstaddr.ss_family) { /*XXX*/
531 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
532 iflr->dstaddr.ss_len);
535 ifra.ifra_mask.sin_family = AF_INET;
536 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
537 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
539 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
544 struct in_ifaddr *ia;
545 struct in_addr mask, candidate, match;
546 struct sockaddr_in *sin;
549 bzero(&mask, sizeof(mask));
550 if (iflr->flags & IFLR_PREFIX) {
551 /* lookup a prefix rather than address. */
552 in_len2mask(&mask, iflr->prefixlen);
554 sin = (struct sockaddr_in *)&iflr->addr;
555 match.s_addr = sin->sin_addr.s_addr;
556 match.s_addr &= mask.s_addr;
558 /* if you set extra bits, that's wrong */
559 if (match.s_addr != sin->sin_addr.s_addr)
564 if (cmd == SIOCGLIFADDR) {
565 /* on getting an address, take the 1st match */
568 /* on deleting an address, do exact match */
569 in_len2mask(&mask, 32);
570 sin = (struct sockaddr_in *)&iflr->addr;
571 match.s_addr = sin->sin_addr.s_addr;
577 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
578 if (ifa->ifa_addr->sa_family != AF_INET6)
582 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
583 candidate.s_addr &= mask.s_addr;
584 if (candidate.s_addr == match.s_addr)
588 return EADDRNOTAVAIL;
589 ia = (struct in_ifaddr *)ifa;
591 if (cmd == SIOCGLIFADDR) {
592 /* fill in the if_laddrreq structure */
593 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
595 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
596 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
597 ia->ia_dstaddr.sin_len);
599 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
602 in_mask2len(&ia->ia_sockmask.sin_addr);
604 iflr->flags = 0; /*XXX*/
608 struct in_aliasreq ifra;
610 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
611 bzero(&ifra, sizeof(ifra));
612 bcopy(iflr->iflr_name, ifra.ifra_name,
613 sizeof(ifra.ifra_name));
615 bcopy(&ia->ia_addr, &ifra.ifra_addr,
616 ia->ia_addr.sin_len);
617 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
618 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
619 ia->ia_dstaddr.sin_len);
621 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
622 ia->ia_sockmask.sin_len);
624 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
630 return EOPNOTSUPP; /*just for safety*/
634 * Delete any existing route for an interface.
638 register struct ifnet *ifp;
639 register struct in_ifaddr *ia;
642 if ((ia->ia_flags & IFA_ROUTE) == 0)
644 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
645 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
647 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
648 ia->ia_flags &= ~IFA_ROUTE;
652 * Initialize an interface's internet address
653 * and routing table entry.
656 in_ifinit(ifp, ia, sin, scrub)
657 register struct ifnet *ifp;
658 register struct in_ifaddr *ia;
659 struct sockaddr_in *sin;
662 register u_long i = ntohl(sin->sin_addr.s_addr);
663 struct sockaddr_in oldaddr;
664 int s = splimp(), flags = RTF_UP, error = 0;
666 oldaddr = ia->ia_addr;
669 * Give the interface a chance to initialize
670 * if this is its first address,
671 * and to validate the address if necessary.
674 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
676 ia->ia_addr = oldaddr;
679 if (oldaddr.sin_family == AF_INET)
680 LIST_REMOVE(ia, ia_hash);
681 if (ia->ia_addr.sin_family == AF_INET)
682 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
686 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
688 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
691 ia->ia_netmask = IN_CLASSA_NET;
692 else if (IN_CLASSB(i))
693 ia->ia_netmask = IN_CLASSB_NET;
695 ia->ia_netmask = IN_CLASSC_NET;
697 * The subnet mask usually includes at least the standard network part,
698 * but may may be smaller in the case of supernetting.
699 * If it is set, we believe it.
701 if (ia->ia_subnetmask == 0) {
702 ia->ia_subnetmask = ia->ia_netmask;
703 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
705 ia->ia_netmask &= ia->ia_subnetmask;
706 ia->ia_net = i & ia->ia_netmask;
707 ia->ia_subnet = i & ia->ia_subnetmask;
708 in_socktrim(&ia->ia_sockmask);
710 * Add route for the network.
712 ia->ia_ifa.ifa_metric = ifp->if_metric;
713 if (ifp->if_flags & IFF_BROADCAST) {
714 ia->ia_broadaddr.sin_addr.s_addr =
715 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
716 ia->ia_netbroadcast.s_addr =
717 htonl(ia->ia_net | ~ ia->ia_netmask);
718 } else if (ifp->if_flags & IFF_LOOPBACK) {
719 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
721 } else if (ifp->if_flags & IFF_POINTOPOINT) {
722 if (ia->ia_dstaddr.sin_family != AF_INET)
728 * Don't add host routes for interface addresses of
729 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
730 * possible to assign several such address pairs with consistent
731 * results (no host route) and is required by BOOTP.
733 * XXX: This is ugly ! There should be a way for the caller to
734 * say that they don't want a host route.
736 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
737 ia->ia_netmask != IN_CLASSA_NET ||
738 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
739 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) {
740 ia->ia_addr = oldaddr;
743 ia->ia_flags |= IFA_ROUTE;
747 * If the interface supports multicast, join the "all hosts"
748 * multicast group on that interface.
750 if (ifp->if_flags & IFF_MULTICAST) {
753 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
754 in_addmulti(&addr, ifp);
761 * Return 1 if the address might be a local broadcast address.
764 in_broadcast(in, ifp)
768 register struct ifaddr *ifa;
771 if (in.s_addr == INADDR_BROADCAST ||
772 in.s_addr == INADDR_ANY)
774 if ((ifp->if_flags & IFF_BROADCAST) == 0)
776 t = ntohl(in.s_addr);
778 * Look through the list of addresses for a match
779 * with a broadcast address.
781 #define ia ((struct in_ifaddr *)ifa)
782 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
783 if (ifa->ifa_addr->sa_family == AF_INET &&
784 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
785 in.s_addr == ia->ia_netbroadcast.s_addr ||
787 * Check for old-style (host 0) broadcast.
789 t == ia->ia_subnet || t == ia->ia_net) &&
791 * Check for an all one subnetmask. These
792 * only exist when an interface gets a secondary
795 ia->ia_subnetmask != (u_long)0xffffffff)
801 * Add an address to the list of IP multicast addresses for a given interface.
805 register struct in_addr *ap;
806 register struct ifnet *ifp;
808 register struct in_multi *inm;
810 struct sockaddr_in sin;
811 struct ifmultiaddr *ifma;
815 * Call generic routine to add membership or increment
816 * refcount. It wants addresses in the form of a sockaddr,
817 * so we build one here (being careful to zero the unused bytes).
819 bzero(&sin, sizeof sin);
820 sin.sin_family = AF_INET;
821 sin.sin_len = sizeof sin;
823 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
830 * If ifma->ifma_protospec is null, then if_addmulti() created
831 * a new record. Otherwise, we are done.
833 if (ifma->ifma_protospec != 0) {
835 return ifma->ifma_protospec;
838 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
839 at interrupt time? If so, need to fix if_addmulti. XXX */
840 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR,
849 inm->inm_ifma = ifma;
850 ifma->ifma_protospec = inm;
851 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
854 * Let IGMP know that we have joined a new IP multicast group.
862 * Delete a multicast address record.
866 register struct in_multi *inm;
868 struct ifmultiaddr *ifma = inm->inm_ifma;
869 struct in_multi my_inm;
872 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
873 if (ifma->ifma_refcount == 1) {
875 * No remaining claims to this record; let IGMP know that
876 * we are leaving the multicast group.
877 * But do it after the if_delmulti() which might reset
878 * the interface and nuke the packet.
881 ifma->ifma_protospec = 0;
882 LIST_REMOVE(inm, inm_link);
883 free(inm, M_IPMADDR);
885 /* XXX - should be separate API for when we have an ifma? */
886 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
887 if (my_inm.inm_ifp != NULL)
888 igmp_leavegroup(&my_inm);