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 1.33 2008/05/24 07:41:25 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
);
339 ia
= ifa_create(sizeof(*ia
), M_WAITOK
);
342 * Protect from NETISR_IP traversing address list
343 * while we're modifying it.
347 TAILQ_INSERT_TAIL(&in_ifaddrhead
, ia
, ia_link
);
349 ifa_iflink(ifa
, ifp
, 1);
351 ifa
->ifa_addr
= (struct sockaddr
*)&ia
->ia_addr
;
352 ifa
->ifa_dstaddr
= (struct sockaddr
*)&ia
->ia_dstaddr
;
353 ifa
->ifa_netmask
= (struct sockaddr
*)&ia
->ia_sockmask
;
354 ia
->ia_sockmask
.sin_len
= 8;
355 ia
->ia_sockmask
.sin_family
= AF_INET
;
356 if (ifp
->if_flags
& IFF_BROADCAST
) {
357 ia
->ia_broadaddr
.sin_len
= sizeof ia
->ia_addr
;
358 ia
->ia_broadaddr
.sin_family
= AF_INET
;
361 if (!(ifp
->if_flags
& IFF_LOOPBACK
))
370 if (td
&& (error
= suser(td
)) != 0)
379 return (EADDRNOTAVAIL
);
385 *((struct sockaddr_in
*)&ifr
->ifr_addr
) = ia
->ia_addr
;
389 if ((ifp
->if_flags
& IFF_BROADCAST
) == 0)
391 *((struct sockaddr_in
*)&ifr
->ifr_dstaddr
) = ia
->ia_broadaddr
;
395 if ((ifp
->if_flags
& IFF_POINTOPOINT
) == 0)
397 *((struct sockaddr_in
*)&ifr
->ifr_dstaddr
) = ia
->ia_dstaddr
;
401 *((struct sockaddr_in
*)&ifr
->ifr_addr
) = ia
->ia_sockmask
;
405 if ((ifp
->if_flags
& IFF_POINTOPOINT
) == 0)
407 oldaddr
= ia
->ia_dstaddr
;
408 ia
->ia_dstaddr
= *(struct sockaddr_in
*)&ifr
->ifr_dstaddr
;
409 if (ifp
->if_ioctl
!= NULL
) {
410 lwkt_serialize_enter(ifp
->if_serializer
);
411 error
= ifp
->if_ioctl(ifp
, SIOCSIFDSTADDR
, (caddr_t
)ia
,
412 td
->td_proc
->p_ucred
);
413 lwkt_serialize_exit(ifp
->if_serializer
);
415 ia
->ia_dstaddr
= oldaddr
;
419 if (ia
->ia_flags
& IFA_ROUTE
) {
420 ia
->ia_ifa
.ifa_dstaddr
= (struct sockaddr
*)&oldaddr
;
421 rtinit(&ia
->ia_ifa
, RTM_DELETE
, RTF_HOST
);
422 ia
->ia_ifa
.ifa_dstaddr
=
423 (struct sockaddr
*)&ia
->ia_dstaddr
;
424 rtinit(&ia
->ia_ifa
, RTM_ADD
, RTF_HOST
| RTF_UP
);
429 if ((ifp
->if_flags
& IFF_BROADCAST
) == 0)
431 ia
->ia_broadaddr
= *(struct sockaddr_in
*)&ifr
->ifr_broadaddr
;
435 error
= in_ifinit(ifp
, ia
,
436 (struct sockaddr_in
*) &ifr
->ifr_addr
, 1);
437 if (error
!= 0 && iaIsNew
)
440 EVENTHANDLER_INVOKE(ifaddr_event
, ifp
);
444 ia
->ia_sockmask
.sin_addr
= ifra
->ifra_addr
.sin_addr
;
445 ia
->ia_subnetmask
= ntohl(ia
->ia_sockmask
.sin_addr
.s_addr
);
452 if (ia
->ia_addr
.sin_family
== AF_INET
) {
453 if (ifra
->ifra_addr
.sin_len
== 0) {
454 ifra
->ifra_addr
= ia
->ia_addr
;
456 } else if (ifra
->ifra_addr
.sin_addr
.s_addr
==
457 ia
->ia_addr
.sin_addr
.s_addr
) {
461 if (ifra
->ifra_mask
.sin_len
) {
463 ia
->ia_sockmask
= ifra
->ifra_mask
;
464 ia
->ia_sockmask
.sin_family
= AF_INET
;
466 ntohl(ia
->ia_sockmask
.sin_addr
.s_addr
);
469 if ((ifp
->if_flags
& IFF_POINTOPOINT
) &&
470 ifra
->ifra_dstaddr
.sin_family
== AF_INET
) {
472 ia
->ia_dstaddr
= ifra
->ifra_dstaddr
;
473 maskIsNew
= 1; /* We lie; but the effect's the same */
475 if (ifra
->ifra_addr
.sin_family
== AF_INET
&&
476 (hostIsNew
|| maskIsNew
))
477 error
= in_ifinit(ifp
, ia
, &ifra
->ifra_addr
, 0);
479 if (error
!= 0 && iaIsNew
)
482 if ((ifp
->if_flags
& IFF_BROADCAST
) &&
483 ifra
->ifra_broadaddr
.sin_family
== AF_INET
)
484 ia
->ia_broadaddr
= ifra
->ifra_broadaddr
;
486 EVENTHANDLER_INVOKE(ifaddr_event
, ifp
);
491 * in_ifscrub kills the interface route.
495 * in_ifadown gets rid of all the rest of
496 * the routes. This is not quite the right
497 * thing to do, but at least if we are running
498 * a routing process they will come back.
500 in_ifadown(&ia
->ia_ifa
, 1);
501 EVENTHANDLER_INVOKE(ifaddr_event
, ifp
);
506 if (ifp
== NULL
|| ifp
->if_ioctl
== NULL
)
508 lwkt_serialize_enter(ifp
->if_serializer
);
509 error
= ifp
->if_ioctl(ifp
, cmd
, data
, td
->td_proc
->p_ucred
);
510 lwkt_serialize_exit(ifp
->if_serializer
);
514 ifa_ifunlink(&ia
->ia_ifa
, ifp
);
517 * Protect from NETISR_IP traversing address list while we're modifying
520 crit_enter(); /* XXX MP */
521 TAILQ_REMOVE(&in_ifaddrhead
, ia
, ia_link
);
522 LIST_REMOVE(ia
, ia_hash
);
523 crit_exit(); /* XXX MP */
525 ifa_destroy(&ia
->ia_ifa
);
532 * SIOCGLIFADDR: get first address. (?!?)
533 * SIOCGLIFADDR with IFLR_PREFIX:
534 * get first address that matches the specified prefix.
535 * SIOCALIFADDR: add the specified address.
536 * SIOCALIFADDR with IFLR_PREFIX:
537 * EINVAL since we can't deduce hostid part of the address.
538 * SIOCDLIFADDR: delete the specified address.
539 * SIOCDLIFADDR with IFLR_PREFIX:
540 * delete the first address that matches the specified prefix.
542 * EINVAL on invalid parameters
543 * EADDRNOTAVAIL on prefix match failed/specified address not found
544 * other values may be returned from in_ioctl()
546 * NOTE! td might be NULL.
549 in_lifaddr_ioctl(struct socket
*so
, u_long cmd
, caddr_t data
, struct ifnet
*ifp
,
552 struct if_laddrreq
*iflr
= (struct if_laddrreq
*)data
;
556 panic("invalid argument to in_lifaddr_ioctl");
562 /* address must be specified on GET with IFLR_PREFIX */
563 if ((iflr
->flags
& IFLR_PREFIX
) == 0)
568 /* address must be specified on ADD and DELETE */
569 if (iflr
->addr
.ss_family
!= AF_INET
)
571 if (iflr
->addr
.ss_len
!= sizeof(struct sockaddr_in
))
573 /* XXX need improvement */
574 if (iflr
->dstaddr
.ss_family
575 && iflr
->dstaddr
.ss_family
!= AF_INET
)
577 if (iflr
->dstaddr
.ss_family
578 && iflr
->dstaddr
.ss_len
!= sizeof(struct sockaddr_in
))
581 default: /*shouldn't happen*/
584 if (sizeof(struct in_addr
) * 8 < iflr
->prefixlen
)
590 struct in_aliasreq ifra
;
592 if (iflr
->flags
& IFLR_PREFIX
)
595 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
596 bzero(&ifra
, sizeof ifra
);
597 bcopy(iflr
->iflr_name
, ifra
.ifra_name
, sizeof ifra
.ifra_name
);
599 bcopy(&iflr
->addr
, &ifra
.ifra_addr
, iflr
->addr
.ss_len
);
601 if (iflr
->dstaddr
.ss_family
) { /*XXX*/
602 bcopy(&iflr
->dstaddr
, &ifra
.ifra_dstaddr
,
603 iflr
->dstaddr
.ss_len
);
606 ifra
.ifra_mask
.sin_family
= AF_INET
;
607 ifra
.ifra_mask
.sin_len
= sizeof(struct sockaddr_in
);
608 in_len2mask(&ifra
.ifra_mask
.sin_addr
, iflr
->prefixlen
);
610 return in_control(so
, SIOCAIFADDR
, (caddr_t
)&ifra
, ifp
, td
);
615 struct ifaddr_container
*ifac
;
616 struct in_ifaddr
*ia
;
617 struct in_addr mask
, candidate
, match
;
618 struct sockaddr_in
*sin
;
621 bzero(&mask
, sizeof mask
);
622 if (iflr
->flags
& IFLR_PREFIX
) {
623 /* lookup a prefix rather than address. */
624 in_len2mask(&mask
, iflr
->prefixlen
);
626 sin
= (struct sockaddr_in
*)&iflr
->addr
;
627 match
.s_addr
= sin
->sin_addr
.s_addr
;
628 match
.s_addr
&= mask
.s_addr
;
630 /* if you set extra bits, that's wrong */
631 if (match
.s_addr
!= sin
->sin_addr
.s_addr
)
636 if (cmd
== SIOCGLIFADDR
) {
637 /* on getting an address, take the 1st match */
638 match
.s_addr
= 0; /* gcc4 warning */
641 /* on deleting an address, do exact match */
642 in_len2mask(&mask
, 32);
643 sin
= (struct sockaddr_in
*)&iflr
->addr
;
644 match
.s_addr
= sin
->sin_addr
.s_addr
;
650 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
651 struct ifaddr
*ifa
= ifac
->ifa
;
653 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
658 ((struct sockaddr_in
*)&ifa
->ifa_addr
)->sin_addr
.s_addr
;
659 candidate
.s_addr
&= mask
.s_addr
;
660 if (candidate
.s_addr
== match
.s_addr
)
664 return EADDRNOTAVAIL
;
665 ia
= (struct in_ifaddr
*)(ifac
->ifa
);
667 if (cmd
== SIOCGLIFADDR
) {
668 /* fill in the if_laddrreq structure */
669 bcopy(&ia
->ia_addr
, &iflr
->addr
, ia
->ia_addr
.sin_len
);
671 if ((ifp
->if_flags
& IFF_POINTOPOINT
) != 0) {
672 bcopy(&ia
->ia_dstaddr
, &iflr
->dstaddr
,
673 ia
->ia_dstaddr
.sin_len
);
675 bzero(&iflr
->dstaddr
, sizeof iflr
->dstaddr
);
678 in_mask2len(&ia
->ia_sockmask
.sin_addr
);
680 iflr
->flags
= 0; /*XXX*/
684 struct in_aliasreq ifra
;
686 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
687 bzero(&ifra
, sizeof ifra
);
688 bcopy(iflr
->iflr_name
, ifra
.ifra_name
,
689 sizeof ifra
.ifra_name
);
691 bcopy(&ia
->ia_addr
, &ifra
.ifra_addr
,
692 ia
->ia_addr
.sin_len
);
693 if ((ifp
->if_flags
& IFF_POINTOPOINT
) != 0) {
694 bcopy(&ia
->ia_dstaddr
, &ifra
.ifra_dstaddr
,
695 ia
->ia_dstaddr
.sin_len
);
697 bcopy(&ia
->ia_sockmask
, &ifra
.ifra_dstaddr
,
698 ia
->ia_sockmask
.sin_len
);
700 return in_control(so
, SIOCDIFADDR
, (caddr_t
)&ifra
,
706 return EOPNOTSUPP
; /*just for safety*/
710 * Delete any existing route for an interface.
713 in_ifscrub(struct ifnet
*ifp
, struct in_ifaddr
*ia
)
716 if ((ia
->ia_flags
& IFA_ROUTE
) == 0)
718 if (ifp
->if_flags
& (IFF_LOOPBACK
|IFF_POINTOPOINT
))
719 rtinit(&ia
->ia_ifa
, RTM_DELETE
, RTF_HOST
);
721 rtinit(&ia
->ia_ifa
, RTM_DELETE
, 0);
722 ia
->ia_flags
&= ~IFA_ROUTE
;
726 * Initialize an interface's internet address
727 * and routing table entry.
730 in_ifinit(struct ifnet
*ifp
, struct in_ifaddr
*ia
, struct sockaddr_in
*sin
, int scrub
)
732 u_long i
= ntohl(sin
->sin_addr
.s_addr
);
733 struct sockaddr_in oldaddr
;
734 int flags
= RTF_UP
, error
= 0;
737 oldaddr
= ia
->ia_addr
;
738 if (oldaddr
.sin_family
== AF_INET
)
739 LIST_REMOVE(ia
, ia_hash
);
742 if (ia
->ia_addr
.sin_family
== AF_INET
) {
743 LIST_INSERT_HEAD(INADDR_HASH(ia
->ia_addr
.sin_addr
.s_addr
),
749 * Give the interface a chance to initialize
750 * if this is its first address,
751 * and to validate the address if necessary.
753 if (ifp
->if_ioctl
!= NULL
) {
754 lwkt_serialize_enter(ifp
->if_serializer
);
755 error
= ifp
->if_ioctl(ifp
, SIOCSIFADDR
, (caddr_t
)ia
, NULL
);
756 lwkt_serialize_exit(ifp
->if_serializer
);
758 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
759 ia
->ia_addr
= oldaddr
;
760 if (ia
->ia_addr
.sin_family
== AF_INET
) {
763 INADDR_HASH(ia
->ia_addr
.sin_addr
.s_addr
),
772 * Delete old route, if requested.
775 ia
->ia_ifa
.ifa_addr
= (struct sockaddr
*)&oldaddr
;
777 ia
->ia_ifa
.ifa_addr
= (struct sockaddr
*)&ia
->ia_addr
;
781 * Calculate netmask/subnetmask.
784 ia
->ia_netmask
= IN_CLASSA_NET
;
785 else if (IN_CLASSB(i
))
786 ia
->ia_netmask
= IN_CLASSB_NET
;
788 ia
->ia_netmask
= IN_CLASSC_NET
;
790 * The subnet mask usually includes at least the standard network part,
791 * but may may be smaller in the case of supernetting.
792 * If it is set, we believe it.
794 if (ia
->ia_subnetmask
== 0) {
795 ia
->ia_subnetmask
= ia
->ia_netmask
;
796 ia
->ia_sockmask
.sin_addr
.s_addr
= htonl(ia
->ia_subnetmask
);
798 ia
->ia_netmask
&= ia
->ia_subnetmask
;
800 ia
->ia_net
= i
& ia
->ia_netmask
;
801 ia
->ia_subnet
= i
& ia
->ia_subnetmask
;
802 in_socktrim(&ia
->ia_sockmask
);
805 * Add route for the network.
807 ia
->ia_ifa
.ifa_metric
= ifp
->if_metric
;
808 if (ifp
->if_flags
& IFF_BROADCAST
) {
809 ia
->ia_broadaddr
.sin_addr
.s_addr
=
810 htonl(ia
->ia_subnet
| ~ia
->ia_subnetmask
);
811 ia
->ia_netbroadcast
.s_addr
=
812 htonl(ia
->ia_net
| ~ ia
->ia_netmask
);
813 } else if (ifp
->if_flags
& IFF_LOOPBACK
) {
814 ia
->ia_ifa
.ifa_dstaddr
= ia
->ia_ifa
.ifa_addr
;
816 } else if (ifp
->if_flags
& IFF_POINTOPOINT
) {
817 if (ia
->ia_dstaddr
.sin_family
!= AF_INET
)
823 * Don't add host routes for interface addresses of
824 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
825 * possible to assign several such address pairs with consistent
826 * results (no host route) and is required by BOOTP.
828 * XXX: This is ugly ! There should be a way for the caller to
829 * say that they don't want a host route.
831 if (ia
->ia_addr
.sin_addr
.s_addr
!= INADDR_ANY
||
832 ia
->ia_netmask
!= IN_CLASSA_NET
||
833 ia
->ia_dstaddr
.sin_addr
.s_addr
!= htonl(IN_CLASSA_HOST
)) {
834 if ((error
= rtinit(&ia
->ia_ifa
, RTM_ADD
, flags
)) != 0) {
835 ia
->ia_addr
= oldaddr
;
838 ia
->ia_flags
|= IFA_ROUTE
;
842 * If the interface supports multicast, join the "all hosts"
843 * multicast group on that interface.
845 if (ifp
->if_flags
& IFF_MULTICAST
) {
848 addr
.s_addr
= htonl(INADDR_ALLHOSTS_GROUP
);
849 in_addmulti(&addr
, ifp
);
856 * Return 1 if the address might be a local broadcast address.
859 in_broadcast(struct in_addr in
, struct ifnet
*ifp
)
861 struct ifaddr_container
*ifac
;
864 if (in
.s_addr
== INADDR_BROADCAST
||
865 in
.s_addr
== INADDR_ANY
)
867 if ((ifp
->if_flags
& IFF_BROADCAST
) == 0)
869 t
= ntohl(in
.s_addr
);
871 * Look through the list of addresses for a match
872 * with a broadcast address.
874 #define ia ((struct in_ifaddr *)ifa)
875 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
876 struct ifaddr
*ifa
= ifac
->ifa
;
878 if (ifa
->ifa_addr
->sa_family
== AF_INET
&&
879 (in
.s_addr
== ia
->ia_broadaddr
.sin_addr
.s_addr
||
880 in
.s_addr
== ia
->ia_netbroadcast
.s_addr
||
882 * Check for old-style (host 0) broadcast.
884 t
== ia
->ia_subnet
|| t
== ia
->ia_net
) &&
886 * Check for an all one subnetmask. These
887 * only exist when an interface gets a secondary
890 ia
->ia_subnetmask
!= (u_long
)0xffffffff)
897 * Add an address to the list of IP multicast addresses for a given interface.
900 in_addmulti(struct in_addr
*ap
, struct ifnet
*ifp
)
902 struct in_multi
*inm
;
904 struct sockaddr_in sin
;
905 struct ifmultiaddr
*ifma
;
908 * Call generic routine to add membership or increment
909 * refcount. It wants addresses in the form of a sockaddr,
910 * so we build one here (being careful to zero the unused bytes).
912 bzero(&sin
, sizeof sin
);
913 sin
.sin_family
= AF_INET
;
914 sin
.sin_len
= sizeof sin
;
917 error
= if_addmulti(ifp
, (struct sockaddr
*)&sin
, &ifma
);
924 * If ifma->ifma_protospec is null, then if_addmulti() created
925 * a new record. Otherwise, we are done.
927 if (ifma
->ifma_protospec
!= 0) {
929 return ifma
->ifma_protospec
;
932 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
933 at interrupt time? If so, need to fix if_addmulti. XXX */
934 inm
= kmalloc(sizeof *inm
, M_IPMADDR
, M_WAITOK
| M_ZERO
);
937 inm
->inm_ifma
= ifma
;
938 ifma
->ifma_protospec
= inm
;
939 LIST_INSERT_HEAD(&in_multihead
, inm
, inm_link
);
942 * Let IGMP know that we have joined a new IP multicast group.
950 * Delete a multicast address record.
953 in_delmulti(struct in_multi
*inm
)
955 struct ifmultiaddr
*ifma
;
956 struct in_multi my_inm
;
959 ifma
= inm
->inm_ifma
;
960 my_inm
.inm_ifp
= NULL
; /* don't send the leave msg */
961 if (ifma
->ifma_refcount
== 1) {
963 * No remaining claims to this record; let IGMP know that
964 * we are leaving the multicast group.
965 * But do it after the if_delmulti() which might reset
966 * the interface and nuke the packet.
969 ifma
->ifma_protospec
= 0;
970 LIST_REMOVE(inm
, inm_link
);
971 kfree(inm
, M_IPMADDR
);
973 /* XXX - should be separate API for when we have an ifma? */
974 if_delmulti(ifma
->ifma_ifp
, ifma
->ifma_addr
);
975 if (my_inm
.inm_ifp
!= NULL
)
976 igmp_leavegroup(&my_inm
);
981 in_ifdetach(struct ifnet
*ifp
)
983 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo
.pcblisthead
), ifp
);
984 in_pcbpurgeif0(LIST_FIRST(&udbinfo
.pcblisthead
), ifp
);