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 1.23 2007/12/28 11:46:38 sephe Exp $
38 #include "opt_bootp.h"
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/sockio.h>
42 #include <sys/malloc.h>
44 #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>
53 #include <netinet/in.h>
54 #include <netinet/in_var.h>
55 #include <netinet/in_pcb.h>
57 #include <netinet/igmp_var.h>
59 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
61 static int in_mask2len (struct in_addr *);
62 static void in_len2mask (struct in_addr *, int);
63 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t,
64 struct ifnet *, struct thread *);
66 static void in_socktrim (struct sockaddr_in *);
67 static int in_ifinit (struct ifnet *,
68 struct in_ifaddr *, struct sockaddr_in *, int);
70 static int subnetsarelocal = 0;
71 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
72 &subnetsarelocal, 0, "");
74 struct in_multihead in_multihead; /* XXX BSS initialization */
76 extern struct inpcbinfo ripcbinfo;
77 extern struct inpcbinfo udbinfo;
80 * Return 1 if an internet address is for a ``local'' host
81 * (one to which we have a connection). If subnetsarelocal
82 * is true, this includes other subnets of the local net.
83 * Otherwise, it includes only the directly-connected (sub)nets.
86 in_localaddr(struct in_addr in)
88 u_long i = ntohl(in.s_addr);
91 if (subnetsarelocal) {
92 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
93 if ((i & ia->ia_netmask) == ia->ia_net)
96 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
97 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
104 * Determine whether an IP address is in a reserved set of addresses
105 * that may not be forwarded, or whether datagrams to that destination
109 in_canforward(struct in_addr in)
111 u_long i = ntohl(in.s_addr);
114 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
117 net = i & IN_CLASSA_NET;
118 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
125 * Trim a mask in a sockaddr
128 in_socktrim(struct sockaddr_in *ap)
130 char *cplim = (char *) &ap->sin_addr;
131 char *cp = (char *) (&ap->sin_addr + 1);
134 while (--cp >= cplim)
136 (ap)->sin_len = cp - (char *) (ap) + 1;
142 in_mask2len(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(struct in_addr *mask, int len)
169 bzero(mask, sizeof *mask);
170 for (i = 0; i < len / 8; i++)
173 p[i] = (0xff00 >> (len % 8)) & 0xff;
176 static int in_interfaces; /* number of external internet interfaces */
179 * Generic internet control operations (ioctl's).
180 * Ifp is 0 if not an interface-specific ioctl.
182 * NOTE! td might be NULL.
186 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
189 struct ifreq *ifr = (struct ifreq *)data;
190 struct in_ifaddr *ia = 0, *iap;
193 struct in_ifaddr *oia;
194 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
195 struct sockaddr_in oldaddr;
196 int hostIsNew, iaIsNew, maskIsNew;
204 if (td && (error = suser(td)) != 0)
210 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
214 * Find address for this interface, if it exists.
216 * If an alias address was specified, find that one instead of
217 * the first one on the interface, if possible
220 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
221 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
222 if (iap->ia_ifp == ifp &&
223 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
228 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
230 if (iap->ia_addr.sin_family == AF_INET) {
242 return (EADDRNOTAVAIL);
243 if (ifra->ifra_addr.sin_family == AF_INET) {
244 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
245 if (ia->ia_ifp == ifp &&
246 ia->ia_addr.sin_addr.s_addr ==
247 ifra->ifra_addr.sin_addr.s_addr)
250 if ((ifp->if_flags & IFF_POINTOPOINT)
251 && (cmd == SIOCAIFADDR)
252 && (ifra->ifra_dstaddr.sin_addr.s_addr
257 if (cmd == SIOCDIFADDR && ia == 0)
258 return (EADDRNOTAVAIL);
263 if (td && (error = suser(td)) != 0)
267 return (EADDRNOTAVAIL);
269 ia = kmalloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
273 * Protect from NETISR_IP traversing address list
274 * while we're modifying it.
278 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
280 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
282 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
283 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
284 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
285 ia->ia_sockmask.sin_len = 8;
286 ia->ia_sockmask.sin_family = AF_INET;
287 if (ifp->if_flags & IFF_BROADCAST) {
288 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
289 ia->ia_broadaddr.sin_family = AF_INET;
292 if (!(ifp->if_flags & IFF_LOOPBACK))
300 if (td && (error = suser(td)) != 0)
308 if (ia == (struct in_ifaddr *)0)
309 return (EADDRNOTAVAIL);
315 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
319 if ((ifp->if_flags & IFF_BROADCAST) == 0)
321 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
325 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
327 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
331 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
335 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
337 oldaddr = ia->ia_dstaddr;
338 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
339 lwkt_serialize_enter(ifp->if_serializer);
341 (error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
342 td->td_proc->p_ucred))) {
343 ia->ia_dstaddr = oldaddr;
344 lwkt_serialize_exit(ifp->if_serializer);
347 if (ia->ia_flags & IFA_ROUTE) {
348 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
349 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
350 ia->ia_ifa.ifa_dstaddr =
351 (struct sockaddr *)&ia->ia_dstaddr;
352 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
354 lwkt_serialize_exit(ifp->if_serializer);
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)
369 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
373 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
374 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
381 if (ia->ia_addr.sin_family == AF_INET) {
382 if (ifra->ifra_addr.sin_len == 0) {
383 ifra->ifra_addr = ia->ia_addr;
385 } else if (ifra->ifra_addr.sin_addr.s_addr ==
386 ia->ia_addr.sin_addr.s_addr)
389 if (ifra->ifra_mask.sin_len) {
391 ia->ia_sockmask = ifra->ifra_mask;
392 ia->ia_sockmask.sin_family = AF_INET;
394 ntohl(ia->ia_sockmask.sin_addr.s_addr);
397 if ((ifp->if_flags & IFF_POINTOPOINT) &&
398 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
400 ia->ia_dstaddr = ifra->ifra_dstaddr;
401 maskIsNew = 1; /* We lie; but the effect's the same */
403 if (ifra->ifra_addr.sin_family == AF_INET &&
404 (hostIsNew || maskIsNew))
405 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
407 if (error != 0 && iaIsNew)
410 if ((ifp->if_flags & IFF_BROADCAST) &&
411 (ifra->ifra_broadaddr.sin_family == AF_INET))
412 ia->ia_broadaddr = ifra->ifra_broadaddr;
414 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
419 * in_ifscrub kills the interface route.
423 * in_ifadown gets rid of all the rest of
424 * the routes. This is not quite the right
425 * thing to do, but at least if we are running
426 * a routing process they will come back.
428 in_ifadown(&ia->ia_ifa, 1);
429 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
434 if (ifp == NULL || ifp->if_ioctl == NULL)
436 lwkt_serialize_enter(ifp->if_serializer);
437 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
438 lwkt_serialize_exit(ifp->if_serializer);
443 * Protect from NETISR_IP traversing address list while we're modifying
446 lwkt_serialize_enter(ifp->if_serializer);
447 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
448 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
449 LIST_REMOVE(ia, ia_hash);
450 IFAFREE(&ia->ia_ifa);
451 lwkt_serialize_exit(ifp->if_serializer);
458 * SIOCGLIFADDR: get first address. (?!?)
459 * SIOCGLIFADDR with IFLR_PREFIX:
460 * get first address that matches the specified prefix.
461 * SIOCALIFADDR: add the specified address.
462 * SIOCALIFADDR with IFLR_PREFIX:
463 * EINVAL since we can't deduce hostid part of the address.
464 * SIOCDLIFADDR: delete the specified address.
465 * SIOCDLIFADDR with IFLR_PREFIX:
466 * delete the first address that matches the specified prefix.
468 * EINVAL on invalid parameters
469 * EADDRNOTAVAIL on prefix match failed/specified address not found
470 * other values may be returned from in_ioctl()
472 * NOTE! td might be NULL.
475 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
478 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
483 panic("invalid argument to in_lifaddr_ioctl");
489 /* address must be specified on GET with IFLR_PREFIX */
490 if ((iflr->flags & IFLR_PREFIX) == 0)
495 /* address must be specified on ADD and DELETE */
496 if (iflr->addr.ss_family != AF_INET)
498 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
500 /* XXX need improvement */
501 if (iflr->dstaddr.ss_family
502 && iflr->dstaddr.ss_family != AF_INET)
504 if (iflr->dstaddr.ss_family
505 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
508 default: /*shouldn't happen*/
511 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
517 struct in_aliasreq ifra;
519 if (iflr->flags & IFLR_PREFIX)
522 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
523 bzero(&ifra, sizeof ifra);
524 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
526 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
528 if (iflr->dstaddr.ss_family) { /*XXX*/
529 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
530 iflr->dstaddr.ss_len);
533 ifra.ifra_mask.sin_family = AF_INET;
534 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
535 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
537 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
542 struct in_ifaddr *ia;
543 struct in_addr mask, candidate, match;
544 struct sockaddr_in *sin;
547 bzero(&mask, sizeof mask);
548 if (iflr->flags & IFLR_PREFIX) {
549 /* lookup a prefix rather than address. */
550 in_len2mask(&mask, iflr->prefixlen);
552 sin = (struct sockaddr_in *)&iflr->addr;
553 match.s_addr = sin->sin_addr.s_addr;
554 match.s_addr &= mask.s_addr;
556 /* if you set extra bits, that's wrong */
557 if (match.s_addr != sin->sin_addr.s_addr)
562 if (cmd == SIOCGLIFADDR) {
563 /* on getting an address, take the 1st match */
564 match.s_addr = 0; /* gcc4 warning */
567 /* on deleting an address, do exact match */
568 in_len2mask(&mask, 32);
569 sin = (struct sockaddr_in *)&iflr->addr;
570 match.s_addr = sin->sin_addr.s_addr;
576 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
577 if (ifa->ifa_addr->sa_family != AF_INET6)
581 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
582 candidate.s_addr &= mask.s_addr;
583 if (candidate.s_addr == match.s_addr)
587 return EADDRNOTAVAIL;
588 ia = (struct in_ifaddr *)ifa;
590 if (cmd == SIOCGLIFADDR) {
591 /* fill in the if_laddrreq structure */
592 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
594 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
595 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
596 ia->ia_dstaddr.sin_len);
598 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
601 in_mask2len(&ia->ia_sockmask.sin_addr);
603 iflr->flags = 0; /*XXX*/
607 struct in_aliasreq ifra;
609 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
610 bzero(&ifra, sizeof ifra);
611 bcopy(iflr->iflr_name, ifra.ifra_name,
612 sizeof ifra.ifra_name);
614 bcopy(&ia->ia_addr, &ifra.ifra_addr,
615 ia->ia_addr.sin_len);
616 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
617 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
618 ia->ia_dstaddr.sin_len);
620 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
621 ia->ia_sockmask.sin_len);
623 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
629 return EOPNOTSUPP; /*just for safety*/
633 * Delete any existing route for an interface.
636 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
639 if ((ia->ia_flags & IFA_ROUTE) == 0)
641 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
642 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
644 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
645 ia->ia_flags &= ~IFA_ROUTE;
649 * Initialize an interface's internet address
650 * and routing table entry.
653 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub)
655 u_long i = ntohl(sin->sin_addr.s_addr);
656 struct sockaddr_in oldaddr;
657 int flags = RTF_UP, error = 0;
659 lwkt_serialize_enter(ifp->if_serializer);
661 oldaddr = ia->ia_addr;
662 if (oldaddr.sin_family == AF_INET)
663 LIST_REMOVE(ia, ia_hash);
665 if (ia->ia_addr.sin_family == AF_INET)
666 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_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, NULL))) {
675 lwkt_serialize_exit(ifp->if_serializer);
676 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
677 ia->ia_addr = oldaddr;
678 if (ia->ia_addr.sin_family == AF_INET)
679 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
683 lwkt_serialize_exit(ifp->if_serializer);
685 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
687 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
690 ia->ia_netmask = IN_CLASSA_NET;
691 else if (IN_CLASSB(i))
692 ia->ia_netmask = IN_CLASSB_NET;
694 ia->ia_netmask = IN_CLASSC_NET;
696 * The subnet mask usually includes at least the standard network part,
697 * but may may be smaller in the case of supernetting.
698 * If it is set, we believe it.
700 if (ia->ia_subnetmask == 0) {
701 ia->ia_subnetmask = ia->ia_netmask;
702 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
704 ia->ia_netmask &= ia->ia_subnetmask;
705 ia->ia_net = i & ia->ia_netmask;
706 ia->ia_subnet = i & ia->ia_subnetmask;
707 in_socktrim(&ia->ia_sockmask);
709 * Add route for the network.
711 ia->ia_ifa.ifa_metric = ifp->if_metric;
712 if (ifp->if_flags & IFF_BROADCAST) {
713 ia->ia_broadaddr.sin_addr.s_addr =
714 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
715 ia->ia_netbroadcast.s_addr =
716 htonl(ia->ia_net | ~ ia->ia_netmask);
717 } else if (ifp->if_flags & IFF_LOOPBACK) {
718 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
720 } else if (ifp->if_flags & IFF_POINTOPOINT) {
721 if (ia->ia_dstaddr.sin_family != AF_INET)
727 * Don't add host routes for interface addresses of
728 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
729 * possible to assign several such address pairs with consistent
730 * results (no host route) and is required by BOOTP.
732 * XXX: This is ugly ! There should be a way for the caller to
733 * say that they don't want a host route.
735 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
736 ia->ia_netmask != IN_CLASSA_NET ||
737 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
738 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) {
739 ia->ia_addr = oldaddr;
742 ia->ia_flags |= IFA_ROUTE;
746 * If the interface supports multicast, join the "all hosts"
747 * multicast group on that interface.
749 if (ifp->if_flags & IFF_MULTICAST) {
752 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
753 in_addmulti(&addr, ifp);
760 * Return 1 if the address might be a local broadcast address.
763 in_broadcast(struct in_addr in, struct ifnet *ifp)
768 if (in.s_addr == INADDR_BROADCAST ||
769 in.s_addr == INADDR_ANY)
771 if ((ifp->if_flags & IFF_BROADCAST) == 0)
773 t = ntohl(in.s_addr);
775 * Look through the list of addresses for a match
776 * with a broadcast address.
778 #define ia ((struct in_ifaddr *)ifa)
779 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
780 if (ifa->ifa_addr->sa_family == AF_INET &&
781 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
782 in.s_addr == ia->ia_netbroadcast.s_addr ||
784 * Check for old-style (host 0) broadcast.
786 t == ia->ia_subnet || t == ia->ia_net) &&
788 * Check for an all one subnetmask. These
789 * only exist when an interface gets a secondary
792 ia->ia_subnetmask != (u_long)0xffffffff)
798 * Add an address to the list of IP multicast addresses for a given interface.
801 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
803 struct in_multi *inm;
805 struct sockaddr_in sin;
806 struct ifmultiaddr *ifma;
809 * Call generic routine to add membership or increment
810 * refcount. It wants addresses in the form of a sockaddr,
811 * so we build one here (being careful to zero the unused bytes).
813 bzero(&sin, sizeof sin);
814 sin.sin_family = AF_INET;
815 sin.sin_len = sizeof sin;
818 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
825 * If ifma->ifma_protospec is null, then if_addmulti() created
826 * a new record. Otherwise, we are done.
828 if (ifma->ifma_protospec != 0) {
830 return ifma->ifma_protospec;
833 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
834 at interrupt time? If so, need to fix if_addmulti. XXX */
835 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
838 inm->inm_ifma = ifma;
839 ifma->ifma_protospec = inm;
840 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
843 * Let IGMP know that we have joined a new IP multicast group.
851 * Delete a multicast address record.
854 in_delmulti(struct in_multi *inm)
856 struct ifmultiaddr *ifma;
857 struct in_multi my_inm;
860 ifma = inm->inm_ifma;
861 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
862 if (ifma->ifma_refcount == 1) {
864 * No remaining claims to this record; let IGMP know that
865 * we are leaving the multicast group.
866 * But do it after the if_delmulti() which might reset
867 * the interface and nuke the packet.
870 ifma->ifma_protospec = 0;
871 LIST_REMOVE(inm, inm_link);
872 kfree(inm, M_IPMADDR);
874 /* XXX - should be separate API for when we have an ifma? */
875 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
876 if (my_inm.inm_ifp != NULL)
877 igmp_leavegroup(&my_inm);
882 in_ifdetach(struct ifnet *ifp)
884 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
885 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);