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 1.16 2005/06/04 14:41:57 joerg 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 static 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.
89 u_long i = ntohl(in.s_addr);
92 if (subnetsarelocal) {
93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
94 if ((i & ia->ia_netmask) == ia->ia_net)
97 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
98 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
105 * Determine whether an IP address is in a reserved set of addresses
106 * that may not be forwarded, or whether datagrams to that destination
113 u_long i = ntohl(in.s_addr);
116 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
119 net = i & IN_CLASSA_NET;
120 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
127 * Trim a mask in a sockaddr
131 struct sockaddr_in *ap;
133 char *cplim = (char *) &ap->sin_addr;
134 char *cp = (char *) (&ap->sin_addr + 1);
137 while (--cp >= cplim)
139 (ap)->sin_len = cp - (char *) (ap) + 1;
146 struct in_addr *mask;
152 for (x = 0; x < sizeof *mask; x++) {
157 if (x < sizeof *mask) {
158 for (y = 0; y < 8; y++) {
159 if ((p[x] & (0x80 >> y)) == 0)
167 in_len2mask(mask, len)
168 struct in_addr *mask;
175 bzero(mask, sizeof *mask);
176 for (i = 0; i < len / 8; i++)
179 p[i] = (0xff00 >> (len % 8)) & 0xff;
182 static int in_interfaces; /* number of external internet interfaces */
185 * Generic internet control operations (ioctl's).
186 * Ifp is 0 if not an interface-specific ioctl.
188 * NOTE! td might be NULL.
192 in_control(so, cmd, data, ifp, td)
199 struct ifreq *ifr = (struct ifreq *)data;
200 struct in_ifaddr *ia = 0, *iap;
203 struct in_ifaddr *oia;
204 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
205 struct sockaddr_in oldaddr;
206 int hostIsNew, iaIsNew, maskIsNew;
214 if (td && (error = suser(td)) != 0)
220 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
224 * Find address for this interface, if it exists.
226 * If an alias address was specified, find that one instead of
227 * the first one on the interface, if possible
230 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
231 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
232 if (iap->ia_ifp == ifp &&
233 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
238 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
240 if (iap->ia_addr.sin_family == AF_INET) {
252 return (EADDRNOTAVAIL);
253 if (ifra->ifra_addr.sin_family == AF_INET) {
254 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
255 if (ia->ia_ifp == ifp &&
256 ia->ia_addr.sin_addr.s_addr ==
257 ifra->ifra_addr.sin_addr.s_addr)
260 if ((ifp->if_flags & IFF_POINTOPOINT)
261 && (cmd == SIOCAIFADDR)
262 && (ifra->ifra_dstaddr.sin_addr.s_addr
267 if (cmd == SIOCDIFADDR && ia == 0)
268 return (EADDRNOTAVAIL);
273 if (td && (error = suser(td)) != 0)
277 return (EADDRNOTAVAIL);
278 if (ia == (struct in_ifaddr *)0) {
279 ia = (struct in_ifaddr *)
280 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
281 if (ia == (struct in_ifaddr *)NULL)
283 bzero(ia, sizeof *ia);
285 * Protect from ipintr() traversing address list
286 * while we're modifying it.
290 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
292 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
294 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
295 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
296 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
297 ia->ia_sockmask.sin_len = 8;
298 ia->ia_sockmask.sin_family = AF_INET;
299 if (ifp->if_flags & IFF_BROADCAST) {
300 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
301 ia->ia_broadaddr.sin_family = AF_INET;
304 if (!(ifp->if_flags & IFF_LOOPBACK))
312 if (td && (error = suser(td)) != 0)
320 if (ia == (struct in_ifaddr *)0)
321 return (EADDRNOTAVAIL);
327 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
331 if ((ifp->if_flags & IFF_BROADCAST) == 0)
333 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
337 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
339 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
343 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
347 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
349 oldaddr = ia->ia_dstaddr;
350 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
352 (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
353 td->td_proc->p_ucred))) {
354 ia->ia_dstaddr = oldaddr;
357 if (ia->ia_flags & IFA_ROUTE) {
358 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
359 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
360 ia->ia_ifa.ifa_dstaddr =
361 (struct sockaddr *)&ia->ia_dstaddr;
362 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
367 if ((ifp->if_flags & IFF_BROADCAST) == 0)
369 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
373 error = in_ifinit(ifp, ia,
374 (struct sockaddr_in *) &ifr->ifr_addr, 1);
375 if (error != 0 && iaIsNew)
378 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
382 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
383 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
390 if (ia->ia_addr.sin_family == AF_INET) {
391 if (ifra->ifra_addr.sin_len == 0) {
392 ifra->ifra_addr = ia->ia_addr;
394 } else if (ifra->ifra_addr.sin_addr.s_addr ==
395 ia->ia_addr.sin_addr.s_addr)
398 if (ifra->ifra_mask.sin_len) {
400 ia->ia_sockmask = ifra->ifra_mask;
401 ia->ia_sockmask.sin_family = AF_INET;
403 ntohl(ia->ia_sockmask.sin_addr.s_addr);
406 if ((ifp->if_flags & IFF_POINTOPOINT) &&
407 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
409 ia->ia_dstaddr = ifra->ifra_dstaddr;
410 maskIsNew = 1; /* We lie; but the effect's the same */
412 if (ifra->ifra_addr.sin_family == AF_INET &&
413 (hostIsNew || maskIsNew))
414 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
416 if (error != 0 && iaIsNew)
419 if ((ifp->if_flags & IFF_BROADCAST) &&
420 (ifra->ifra_broadaddr.sin_family == AF_INET))
421 ia->ia_broadaddr = ifra->ifra_broadaddr;
423 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
428 * in_ifscrub kills the interface route.
432 * in_ifadown gets rid of all the rest of
433 * the routes. This is not quite the right
434 * thing to do, but at least if we are running
435 * a routing process they will come back.
437 in_ifadown(&ia->ia_ifa, 1);
438 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
443 if (ifp == NULL || ifp->if_ioctl == NULL)
445 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
449 * Protect from ipintr() traversing address list while we're modifying
453 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
454 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
455 LIST_REMOVE(ia, ia_hash);
456 IFAFREE(&ia->ia_ifa);
464 * SIOCGLIFADDR: get first address. (?!?)
465 * SIOCGLIFADDR with IFLR_PREFIX:
466 * get first address that matches the specified prefix.
467 * SIOCALIFADDR: add the specified address.
468 * SIOCALIFADDR with IFLR_PREFIX:
469 * EINVAL since we can't deduce hostid part of the address.
470 * SIOCDLIFADDR: delete the specified address.
471 * SIOCDLIFADDR with IFLR_PREFIX:
472 * delete the first address that matches the specified prefix.
474 * EINVAL on invalid parameters
475 * EADDRNOTAVAIL on prefix match failed/specified address not found
476 * other values may be returned from in_ioctl()
478 * NOTE! td might be NULL.
481 in_lifaddr_ioctl(so, cmd, data, ifp, td)
488 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
493 panic("invalid argument to in_lifaddr_ioctl");
499 /* address must be specified on GET with IFLR_PREFIX */
500 if ((iflr->flags & IFLR_PREFIX) == 0)
505 /* address must be specified on ADD and DELETE */
506 if (iflr->addr.ss_family != AF_INET)
508 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
510 /* XXX need improvement */
511 if (iflr->dstaddr.ss_family
512 && iflr->dstaddr.ss_family != AF_INET)
514 if (iflr->dstaddr.ss_family
515 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
518 default: /*shouldn't happen*/
521 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
527 struct in_aliasreq ifra;
529 if (iflr->flags & IFLR_PREFIX)
532 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
533 bzero(&ifra, sizeof ifra);
534 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
536 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
538 if (iflr->dstaddr.ss_family) { /*XXX*/
539 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
540 iflr->dstaddr.ss_len);
543 ifra.ifra_mask.sin_family = AF_INET;
544 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
545 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
547 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
552 struct in_ifaddr *ia;
553 struct in_addr mask, candidate, match;
554 struct sockaddr_in *sin;
557 bzero(&mask, sizeof mask);
558 if (iflr->flags & IFLR_PREFIX) {
559 /* lookup a prefix rather than address. */
560 in_len2mask(&mask, iflr->prefixlen);
562 sin = (struct sockaddr_in *)&iflr->addr;
563 match.s_addr = sin->sin_addr.s_addr;
564 match.s_addr &= mask.s_addr;
566 /* if you set extra bits, that's wrong */
567 if (match.s_addr != sin->sin_addr.s_addr)
572 if (cmd == SIOCGLIFADDR) {
573 /* on getting an address, take the 1st match */
576 /* on deleting an address, do exact match */
577 in_len2mask(&mask, 32);
578 sin = (struct sockaddr_in *)&iflr->addr;
579 match.s_addr = sin->sin_addr.s_addr;
585 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
586 if (ifa->ifa_addr->sa_family != AF_INET6)
590 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
591 candidate.s_addr &= mask.s_addr;
592 if (candidate.s_addr == match.s_addr)
596 return EADDRNOTAVAIL;
597 ia = (struct in_ifaddr *)ifa;
599 if (cmd == SIOCGLIFADDR) {
600 /* fill in the if_laddrreq structure */
601 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
603 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
604 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
605 ia->ia_dstaddr.sin_len);
607 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
610 in_mask2len(&ia->ia_sockmask.sin_addr);
612 iflr->flags = 0; /*XXX*/
616 struct in_aliasreq ifra;
618 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
619 bzero(&ifra, sizeof ifra);
620 bcopy(iflr->iflr_name, ifra.ifra_name,
621 sizeof ifra.ifra_name);
623 bcopy(&ia->ia_addr, &ifra.ifra_addr,
624 ia->ia_addr.sin_len);
625 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
626 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
627 ia->ia_dstaddr.sin_len);
629 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
630 ia->ia_sockmask.sin_len);
632 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
638 return EOPNOTSUPP; /*just for safety*/
642 * Delete any existing route for an interface.
647 struct in_ifaddr *ia;
650 if ((ia->ia_flags & IFA_ROUTE) == 0)
652 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
653 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
655 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
656 ia->ia_flags &= ~IFA_ROUTE;
660 * Initialize an interface's internet address
661 * and routing table entry.
664 in_ifinit(ifp, ia, sin, scrub)
666 struct in_ifaddr *ia;
667 struct sockaddr_in *sin;
670 u_long i = ntohl(sin->sin_addr.s_addr);
671 struct sockaddr_in oldaddr;
672 int flags = RTF_UP, error = 0;
676 oldaddr = ia->ia_addr;
677 if (oldaddr.sin_family == AF_INET)
678 LIST_REMOVE(ia, ia_hash);
680 if (ia->ia_addr.sin_family == AF_INET)
681 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
684 * Give the interface a chance to initialize
685 * if this is its first address,
686 * and to validate the address if necessary.
689 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia,
690 (struct ucred *)NULL))) {
692 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
693 ia->ia_addr = oldaddr;
694 if (ia->ia_addr.sin_family == AF_INET)
695 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
701 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
703 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
706 ia->ia_netmask = IN_CLASSA_NET;
707 else if (IN_CLASSB(i))
708 ia->ia_netmask = IN_CLASSB_NET;
710 ia->ia_netmask = IN_CLASSC_NET;
712 * The subnet mask usually includes at least the standard network part,
713 * but may may be smaller in the case of supernetting.
714 * If it is set, we believe it.
716 if (ia->ia_subnetmask == 0) {
717 ia->ia_subnetmask = ia->ia_netmask;
718 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
720 ia->ia_netmask &= ia->ia_subnetmask;
721 ia->ia_net = i & ia->ia_netmask;
722 ia->ia_subnet = i & ia->ia_subnetmask;
723 in_socktrim(&ia->ia_sockmask);
725 * Add route for the network.
727 ia->ia_ifa.ifa_metric = ifp->if_metric;
728 if (ifp->if_flags & IFF_BROADCAST) {
729 ia->ia_broadaddr.sin_addr.s_addr =
730 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
731 ia->ia_netbroadcast.s_addr =
732 htonl(ia->ia_net | ~ ia->ia_netmask);
733 } else if (ifp->if_flags & IFF_LOOPBACK) {
734 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
736 } else if (ifp->if_flags & IFF_POINTOPOINT) {
737 if (ia->ia_dstaddr.sin_family != AF_INET)
743 * Don't add host routes for interface addresses of
744 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
745 * possible to assign several such address pairs with consistent
746 * results (no host route) and is required by BOOTP.
748 * XXX: This is ugly ! There should be a way for the caller to
749 * say that they don't want a host route.
751 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
752 ia->ia_netmask != IN_CLASSA_NET ||
753 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
754 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) {
755 ia->ia_addr = oldaddr;
758 ia->ia_flags |= IFA_ROUTE;
762 * If the interface supports multicast, join the "all hosts"
763 * multicast group on that interface.
765 if (ifp->if_flags & IFF_MULTICAST) {
768 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
769 in_addmulti(&addr, ifp);
776 * Return 1 if the address might be a local broadcast address.
779 in_broadcast(struct in_addr in, struct ifnet *ifp)
784 if (in.s_addr == INADDR_BROADCAST ||
785 in.s_addr == INADDR_ANY)
787 if ((ifp->if_flags & IFF_BROADCAST) == 0)
789 t = ntohl(in.s_addr);
791 * Look through the list of addresses for a match
792 * with a broadcast address.
794 #define ia ((struct in_ifaddr *)ifa)
795 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
796 if (ifa->ifa_addr->sa_family == AF_INET &&
797 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
798 in.s_addr == ia->ia_netbroadcast.s_addr ||
800 * Check for old-style (host 0) broadcast.
802 t == ia->ia_subnet || t == ia->ia_net) &&
804 * Check for an all one subnetmask. These
805 * only exist when an interface gets a secondary
808 ia->ia_subnetmask != (u_long)0xffffffff)
814 * Add an address to the list of IP multicast addresses for a given interface.
821 struct in_multi *inm;
823 struct sockaddr_in sin;
824 struct ifmultiaddr *ifma;
827 * Call generic routine to add membership or increment
828 * refcount. It wants addresses in the form of a sockaddr,
829 * so we build one here (being careful to zero the unused bytes).
831 bzero(&sin, sizeof sin);
832 sin.sin_family = AF_INET;
833 sin.sin_len = sizeof sin;
836 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
843 * If ifma->ifma_protospec is null, then if_addmulti() created
844 * a new record. Otherwise, we are done.
846 if (ifma->ifma_protospec != 0) {
848 return ifma->ifma_protospec;
851 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
852 at interrupt time? If so, need to fix if_addmulti. XXX */
853 inm = malloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
856 inm->inm_ifma = ifma;
857 ifma->ifma_protospec = inm;
858 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
861 * Let IGMP know that we have joined a new IP multicast group.
869 * Delete a multicast address record.
873 struct in_multi *inm;
875 struct ifmultiaddr *ifma;
876 struct in_multi my_inm;
879 ifma = inm->inm_ifma;
880 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
881 if (ifma->ifma_refcount == 1) {
883 * No remaining claims to this record; let IGMP know that
884 * we are leaving the multicast group.
885 * But do it after the if_delmulti() which might reset
886 * the interface and nuke the packet.
889 ifma->ifma_protospec = 0;
890 LIST_REMOVE(inm, inm_link);
891 free(inm, M_IPMADDR);
893 /* XXX - should be separate API for when we have an ifma? */
894 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
895 if (my_inm.inm_ifp != NULL)
896 igmp_leavegroup(&my_inm);
901 in_ifdetach(struct ifnet *ifp)
903 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
904 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);