1/*
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 *
33 * @(#)in.c 8.4 (Berkeley) 1/9/95
| 1/*
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 *
33 * @(#)in.c 8.4 (Berkeley) 1/9/95
|
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/ioctl.h>
40#include <sys/errno.h>
41#include <sys/malloc.h>
42#include <sys/socket.h>
43#include <sys/socketvar.h>
44#include <sys/queue.h>
45
46#include <net/if.h>
47#include <net/route.h>
48
49#include <netinet/in_systm.h>
50#include <netinet/in.h>
51#include <netinet/in_var.h>
52#include <netinet/if_ether.h>
53
54#include <netinet/igmp_var.h>
55
56/*
57 * This structure is used to keep track of in_multi chains which belong to
58 * deleted interface addresses.
59 */
60static LIST_HEAD(, multi_kludge) in_mk; /* XXX BSS initialization */
61
62struct multi_kludge {
63 LIST_ENTRY(multi_kludge) mk_entry;
64 struct ifnet *mk_ifp;
65 struct in_multihead mk_head;
66};
67
68/*
69 * Return the network number from an internet address.
70 */
71u_long
72in_netof(in)
73 struct in_addr in;
74{
75 register u_long i = ntohl(in.s_addr);
76 register u_long net;
77 register struct in_ifaddr *ia;
78
79 if (IN_CLASSA(i))
80 net = i & IN_CLASSA_NET;
81 else if (IN_CLASSB(i))
82 net = i & IN_CLASSB_NET;
83 else if (IN_CLASSC(i))
84 net = i & IN_CLASSC_NET;
85 else if (IN_CLASSD(i))
86 net = i & IN_CLASSD_NET;
87 else
88 return (0);
89
90 /*
91 * Check whether network is a subnet;
92 * if so, return subnet number.
93 */
94 for (ia = in_ifaddr; ia; ia = ia->ia_next)
95 if (net == ia->ia_net)
96 return (i & ia->ia_subnetmask);
97 return (net);
98}
99
100#ifndef SUBNETSARELOCAL
101#define SUBNETSARELOCAL 1
102#endif
103int subnetsarelocal = SUBNETSARELOCAL;
104/*
105 * Return 1 if an internet address is for a ``local'' host
106 * (one to which we have a connection). If subnetsarelocal
107 * is true, this includes other subnets of the local net.
108 * Otherwise, it includes only the directly-connected (sub)nets.
109 */
110int
111in_localaddr(in)
112 struct in_addr in;
113{
114 register u_long i = ntohl(in.s_addr);
115 register struct in_ifaddr *ia;
116
117 if (subnetsarelocal) {
118 for (ia = in_ifaddr; ia; ia = ia->ia_next)
119 if ((i & ia->ia_netmask) == ia->ia_net)
120 return (1);
121 } else {
122 for (ia = in_ifaddr; ia; ia = ia->ia_next)
123 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
124 return (1);
125 }
126 return (0);
127}
128
129/*
130 * Determine whether an IP address is in a reserved set of addresses
131 * that may not be forwarded, or whether datagrams to that destination
132 * may be forwarded.
133 */
134int
135in_canforward(in)
136 struct in_addr in;
137{
138 register u_long i = ntohl(in.s_addr);
139 register u_long net;
140
141 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
142 return (0);
143 if (IN_CLASSA(i)) {
144 net = i & IN_CLASSA_NET;
145 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
146 return (0);
147 }
148 return (1);
149}
150
151/*
152 * Trim a mask in a sockaddr
153 */
154void
155in_socktrim(ap)
156struct sockaddr_in *ap;
157{
158 register char *cplim = (char *) &ap->sin_addr;
159 register char *cp = (char *) (&ap->sin_addr + 1);
160
161 ap->sin_len = 0;
162 while (--cp >= cplim)
163 if (*cp) {
164 (ap)->sin_len = cp - (char *) (ap) + 1;
165 break;
166 }
167}
168
169int in_interfaces; /* number of external internet interfaces */
170
171/*
172 * Generic internet control operations (ioctl's).
173 * Ifp is 0 if not an interface-specific ioctl.
174 */
175/* ARGSUSED */
176int
177in_control(so, cmd, data, ifp)
178 struct socket *so;
179 u_long cmd;
180 caddr_t data;
181 register struct ifnet *ifp;
182{
183 register struct ifreq *ifr = (struct ifreq *)data;
184 register struct in_ifaddr *ia = 0;
185 register struct ifaddr *ifa;
186 struct in_ifaddr *oia;
187 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
188 struct sockaddr_in oldaddr;
189 int error, hostIsNew, maskIsNew;
190 u_long i;
191 struct multi_kludge *mk;
192
193 /*
194 * Find address for this interface, if it exists.
195 */
196 if (ifp)
197 for (ia = in_ifaddr; ia; ia = ia->ia_next)
198 if (ia->ia_ifp == ifp)
199 break;
200
201 switch (cmd) {
202
203 case SIOCAIFADDR:
204 case SIOCDIFADDR:
205 if (ifra->ifra_addr.sin_family == AF_INET) {
206 for (oia = ia; ia; ia = ia->ia_next) {
207 if (ia->ia_ifp == ifp &&
208 ia->ia_addr.sin_addr.s_addr ==
209 ifra->ifra_addr.sin_addr.s_addr)
210 break;
211 }
212 if ((ifp->if_flags & IFF_POINTOPOINT)
213 && (cmd == SIOCAIFADDR)
214 && (ifra->ifra_dstaddr.sin_addr.s_addr
215 == INADDR_ANY)) {
216 return EDESTADDRREQ;
217 }
218 }
219 if (cmd == SIOCDIFADDR && ia == 0)
220 return (EADDRNOTAVAIL);
221 /* FALLTHROUGH */
222 case SIOCSIFADDR:
223 case SIOCSIFNETMASK:
224 case SIOCSIFDSTADDR:
225 if ((so->so_state & SS_PRIV) == 0)
226 return (EPERM);
227
228 if (ifp == 0)
229 panic("in_control");
230 if (ia == (struct in_ifaddr *)0) {
231 oia = (struct in_ifaddr *)
232 malloc(sizeof *oia, M_IFADDR, M_WAITOK);
233 if (oia == (struct in_ifaddr *)NULL)
234 return (ENOBUFS);
235 bzero((caddr_t)oia, sizeof *oia);
236 ia = in_ifaddr;
237 if (ia) {
238 for ( ; ia->ia_next; ia = ia->ia_next)
239 continue;
240 ia->ia_next = oia;
241 } else
242 in_ifaddr = oia;
243 ia = oia;
244 ifa = ifp->if_addrlist;
245 if (ifa) {
246 for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
247 continue;
248 ifa->ifa_next = (struct ifaddr *) ia;
249 } else
250 ifp->if_addrlist = (struct ifaddr *) ia;
251 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
252 ia->ia_ifa.ifa_dstaddr
253 = (struct sockaddr *)&ia->ia_dstaddr;
254 ia->ia_ifa.ifa_netmask
255 = (struct sockaddr *)&ia->ia_sockmask;
256 ia->ia_sockmask.sin_len = 8;
257 if (ifp->if_flags & IFF_BROADCAST) {
258 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
259 ia->ia_broadaddr.sin_family = AF_INET;
260 }
261 ia->ia_ifp = ifp;
262 if (!(ifp->if_flags & IFF_LOOPBACK))
263 in_interfaces++;
264 }
265 break;
266
267 case SIOCSIFBRDADDR:
268 if ((so->so_state & SS_PRIV) == 0)
269 return (EPERM);
270 /* FALLTHROUGH */
271
272 case SIOCGIFADDR:
273 case SIOCGIFNETMASK:
274 case SIOCGIFDSTADDR:
275 case SIOCGIFBRDADDR:
276 if (ia == (struct in_ifaddr *)0)
277 return (EADDRNOTAVAIL);
278 break;
279 }
280 switch (cmd) {
281
282 case SIOCGIFADDR:
283 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
284 break;
285
286 case SIOCGIFBRDADDR:
287 if ((ifp->if_flags & IFF_BROADCAST) == 0)
288 return (EINVAL);
289 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
290 break;
291
292 case SIOCGIFDSTADDR:
293 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
294 return (EINVAL);
295 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
296 break;
297
298 case SIOCGIFNETMASK:
299 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
300 break;
301
302 case SIOCSIFDSTADDR:
303 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
304 return (EINVAL);
305 oldaddr = ia->ia_dstaddr;
306 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
307 if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
308 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
309 ia->ia_dstaddr = oldaddr;
310 return (error);
311 }
312 if (ia->ia_flags & IFA_ROUTE) {
313 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
314 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
315 ia->ia_ifa.ifa_dstaddr =
316 (struct sockaddr *)&ia->ia_dstaddr;
317 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
318 }
319 break;
320
321 case SIOCSIFBRDADDR:
322 if ((ifp->if_flags & IFF_BROADCAST) == 0)
323 return (EINVAL);
324 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
325 break;
326
327 case SIOCSIFADDR:
328 return (in_ifinit(ifp, ia,
329 (struct sockaddr_in *) &ifr->ifr_addr, 1));
330
331 case SIOCSIFNETMASK:
332 i = ifra->ifra_addr.sin_addr.s_addr;
333 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
334 break;
335
336 case SIOCAIFADDR:
337 maskIsNew = 0;
338 hostIsNew = 1;
339 error = 0;
340 if (ia->ia_addr.sin_family == AF_INET) {
341 if (ifra->ifra_addr.sin_len == 0) {
342 ifra->ifra_addr = ia->ia_addr;
343 hostIsNew = 0;
344 } else if (ifra->ifra_addr.sin_addr.s_addr ==
345 ia->ia_addr.sin_addr.s_addr)
346 hostIsNew = 0;
347 }
348 if (ifra->ifra_mask.sin_len) {
349 in_ifscrub(ifp, ia);
350 ia->ia_sockmask = ifra->ifra_mask;
351 ia->ia_subnetmask =
352 ntohl(ia->ia_sockmask.sin_addr.s_addr);
353 maskIsNew = 1;
354 }
355 if ((ifp->if_flags & IFF_POINTOPOINT) &&
356 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
357 in_ifscrub(ifp, ia);
358 ia->ia_dstaddr = ifra->ifra_dstaddr;
359 maskIsNew = 1; /* We lie; but the effect's the same */
360 }
361 if (ifra->ifra_addr.sin_family == AF_INET &&
362 (hostIsNew || maskIsNew))
363 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
364 if ((ifp->if_flags & IFF_BROADCAST) &&
365 (ifra->ifra_broadaddr.sin_family == AF_INET))
366 ia->ia_broadaddr = ifra->ifra_broadaddr;
367 return (error);
368
369 case SIOCDIFADDR:
370 mk = malloc(sizeof *mk, M_IPMADDR, M_WAITOK);
371 if (!mk)
372 return ENOBUFS;
373
374 in_ifscrub(ifp, ia);
375 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
376 ifp->if_addrlist = ifa->ifa_next;
377 else {
378 while (ifa->ifa_next &&
379 (ifa->ifa_next != (struct ifaddr *)ia))
380 ifa = ifa->ifa_next;
381 if (ifa->ifa_next)
382 ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
383 else
384 printf("Couldn't unlink inifaddr from ifp\n");
385 }
386 oia = ia;
387 if (oia == (ia = in_ifaddr))
388 in_ifaddr = ia->ia_next;
389 else {
390 while (ia->ia_next && (ia->ia_next != oia))
391 ia = ia->ia_next;
392 if (ia->ia_next)
393 ia->ia_next = oia->ia_next;
394 else
395 printf("Didn't unlink inifadr from list\n");
396 }
397
398 if (!oia->ia_multiaddrs.lh_first) {
399 IFAFREE(&oia->ia_ifa);
400 FREE(mk, M_IPMADDR);
401 break;
402 }
403
404 /*
405 * Multicast address kludge:
406 * If there were any multicast addresses attached to this
407 * interface address, either move them to another address
408 * on this interface, or save them until such time as this
409 * interface is reconfigured for IP.
410 */
411 IFP_TO_IA(oia->ia_ifp, ia);
412 if (ia) { /* there is another address */
413 struct in_multi *inm;
414 for(inm = oia->ia_multiaddrs.lh_first; inm;
415 inm = inm->inm_entry.le_next) {
416 IFAFREE(&inm->inm_ia->ia_ifa);
417 ia->ia_ifa.ifa_refcnt++;
418 inm->inm_ia = ia;
419 LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm,
420 inm_entry);
421 }
422 FREE(mk, M_IPMADDR);
423 } else { /* last address on this if deleted, save */
424 struct in_multi *inm;
425
426 LIST_INIT(&mk->mk_head);
427 mk->mk_ifp = ifp;
428
429 for(inm = oia->ia_multiaddrs.lh_first; inm;
430 inm = inm->inm_entry.le_next) {
431 LIST_INSERT_HEAD(&mk->mk_head, inm, inm_entry);
432 }
433
434 if (mk->mk_head.lh_first) {
435 LIST_INSERT_HEAD(&in_mk, mk, mk_entry);
436 } else {
437 FREE(mk, M_IPMADDR);
438 }
439 }
440
441 IFAFREE((&oia->ia_ifa));
442 break;
443
444 default:
445 if (ifp == 0 || ifp->if_ioctl == 0)
446 return (EOPNOTSUPP);
447 return ((*ifp->if_ioctl)(ifp, cmd, data));
448 }
449 return (0);
450}
451
452/*
453 * Delete any existing route for an interface.
454 */
455void
456in_ifscrub(ifp, ia)
457 register struct ifnet *ifp;
458 register struct in_ifaddr *ia;
459{
460
461 if ((ia->ia_flags & IFA_ROUTE) == 0)
462 return;
463 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
464 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
465 else
466 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
467 ia->ia_flags &= ~IFA_ROUTE;
468}
469
470/*
471 * Initialize an interface's internet address
472 * and routing table entry.
473 */
474int
475in_ifinit(ifp, ia, sin, scrub)
476 register struct ifnet *ifp;
477 register struct in_ifaddr *ia;
478 struct sockaddr_in *sin;
479 int scrub;
480{
481 register u_long i = ntohl(sin->sin_addr.s_addr);
482 struct sockaddr_in oldaddr;
483 int s = splimp(), flags = RTF_UP, error;
484 struct multi_kludge *mk;
485
486 oldaddr = ia->ia_addr;
487 ia->ia_addr = *sin;
488 /*
489 * Give the interface a chance to initialize
490 * if this is its first address,
491 * and to validate the address if necessary.
492 */
493 if (ifp->if_ioctl &&
494 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
495 splx(s);
496 ia->ia_addr = oldaddr;
497 return (error);
498 }
499 splx(s);
500 if (scrub) {
501 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
502 in_ifscrub(ifp, ia);
503 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
504 }
505 if (IN_CLASSA(i))
506 ia->ia_netmask = IN_CLASSA_NET;
507 else if (IN_CLASSB(i))
508 ia->ia_netmask = IN_CLASSB_NET;
509 else
510 ia->ia_netmask = IN_CLASSC_NET;
511 /*
512 * The subnet mask usually includes at least the standard network part,
513 * but may may be smaller in the case of supernetting.
514 * If it is set, we believe it.
515 */
516 if (ia->ia_subnetmask == 0) {
517 ia->ia_subnetmask = ia->ia_netmask;
518 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
519 } else
520 ia->ia_netmask &= ia->ia_subnetmask;
521 ia->ia_net = i & ia->ia_netmask;
522 ia->ia_subnet = i & ia->ia_subnetmask;
523 in_socktrim(&ia->ia_sockmask);
524 /*
525 * Add route for the network.
526 */
527 ia->ia_ifa.ifa_metric = ifp->if_metric;
528 if (ifp->if_flags & IFF_BROADCAST) {
529 ia->ia_broadaddr.sin_addr.s_addr =
530 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
531 ia->ia_netbroadcast.s_addr =
532 htonl(ia->ia_net | ~ ia->ia_netmask);
533 } else if (ifp->if_flags & IFF_LOOPBACK) {
534 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
535 flags |= RTF_HOST;
536 } else if (ifp->if_flags & IFF_POINTOPOINT) {
537 if (ia->ia_dstaddr.sin_family != AF_INET)
538 return (0);
539 flags |= RTF_HOST;
540 }
541 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
542 ia->ia_flags |= IFA_ROUTE;
543
544 LIST_INIT(&ia->ia_multiaddrs);
545 /*
546 * If the interface supports multicast, join the "all hosts"
547 * multicast group on that interface.
548 */
549 if (ifp->if_flags & IFF_MULTICAST) {
550 struct in_addr addr;
551
552 /*
553 * Continuation of multicast address hack:
554 * If there was a multicast group list previously saved
555 * for this interface, then we re-attach it to the first
556 * address configured on the i/f.
557 */
558 for(mk = in_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
559 if(mk->mk_ifp == ifp) {
560 struct in_multi *inm;
561
562 for(inm = mk->mk_head.lh_first; inm;
563 inm = inm->inm_entry.le_next) {
564 IFAFREE(&inm->inm_ia->ia_ifa);
565 ia->ia_ifa.ifa_refcnt++;
566 inm->inm_ia = ia;
567 LIST_INSERT_HEAD(&ia->ia_multiaddrs,
568 inm, inm_entry);
569 }
570 LIST_REMOVE(mk, mk_entry);
571 free(mk, M_IPMADDR);
572 break;
573 }
574 }
575
576 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
577 in_addmulti(&addr, ifp);
578 }
579 return (error);
580}
581
582
583/*
584 * Return 1 if the address might be a local broadcast address.
585 */
586int
587in_broadcast(in, ifp)
588 struct in_addr in;
589 struct ifnet *ifp;
590{
591 register struct ifaddr *ifa;
592 u_long t;
593
594 if (in.s_addr == INADDR_BROADCAST ||
595 in.s_addr == INADDR_ANY)
596 return 1;
597 if ((ifp->if_flags & IFF_BROADCAST) == 0)
598 return 0;
599 t = ntohl(in.s_addr);
600 /*
601 * Look through the list of addresses for a match
602 * with a broadcast address.
603 */
604#define ia ((struct in_ifaddr *)ifa)
605 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
606 if (ifa->ifa_addr->sa_family == AF_INET &&
607 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
608 in.s_addr == ia->ia_netbroadcast.s_addr ||
609 /*
610 * Check for old-style (host 0) broadcast.
611 */
612 t == ia->ia_subnet || t == ia->ia_net))
613 return 1;
614 return (0);
615#undef ia
616}
617/*
618 * Add an address to the list of IP multicast addresses for a given interface.
619 */
620struct in_multi *
621in_addmulti(ap, ifp)
622 register struct in_addr *ap;
623 register struct ifnet *ifp;
624{
625 register struct in_multi *inm;
626 struct ifreq ifr;
627 struct in_ifaddr *ia;
628 int s = splnet();
629
630 /*
631 * See if address already in list.
632 */
633 IN_LOOKUP_MULTI(*ap, ifp, inm);
634 if (inm != NULL) {
635 /*
636 * Found it; just increment the reference count.
637 */
638 ++inm->inm_refcount;
639 }
640 else {
641 /*
642 * New address; allocate a new multicast record
643 * and link it into the interface's multicast list.
644 */
645 inm = (struct in_multi *)malloc(sizeof(*inm),
646 M_IPMADDR, M_NOWAIT);
647 if (inm == NULL) {
648 splx(s);
649 return (NULL);
650 }
651 inm->inm_addr = *ap;
652 inm->inm_ifp = ifp;
653 inm->inm_refcount = 1;
654 IFP_TO_IA(ifp, ia);
655 if (ia == NULL) {
656 free(inm, M_IPMADDR);
657 splx(s);
658 return (NULL);
659 }
660 inm->inm_ia = ia;
661 ia->ia_ifa.ifa_refcnt++; /* gain a reference */
662 LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_entry);
663
664 /*
665 * Ask the network driver to update its multicast reception
666 * filter appropriately for the new address.
667 */
668 ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET;
669 ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap;
670 if ((ifp->if_ioctl == NULL) ||
671 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
672 LIST_REMOVE(inm, inm_entry);
673 IFAFREE(&ia->ia_ifa); /* release reference */
674 free(inm, M_IPMADDR);
675 splx(s);
676 return (NULL);
677 }
678 /*
679 * Let IGMP know that we have joined a new IP multicast group.
680 */
681 igmp_joingroup(inm);
682 }
683 splx(s);
684 return (inm);
685}
686
687/*
688 * Delete a multicast address record.
689 */
690void
691in_delmulti(inm)
692 register struct in_multi *inm;
693{
| 35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/ioctl.h>
40#include <sys/errno.h>
41#include <sys/malloc.h>
42#include <sys/socket.h>
43#include <sys/socketvar.h>
44#include <sys/queue.h>
45
46#include <net/if.h>
47#include <net/route.h>
48
49#include <netinet/in_systm.h>
50#include <netinet/in.h>
51#include <netinet/in_var.h>
52#include <netinet/if_ether.h>
53
54#include <netinet/igmp_var.h>
55
56/*
57 * This structure is used to keep track of in_multi chains which belong to
58 * deleted interface addresses.
59 */
60static LIST_HEAD(, multi_kludge) in_mk; /* XXX BSS initialization */
61
62struct multi_kludge {
63 LIST_ENTRY(multi_kludge) mk_entry;
64 struct ifnet *mk_ifp;
65 struct in_multihead mk_head;
66};
67
68/*
69 * Return the network number from an internet address.
70 */
71u_long
72in_netof(in)
73 struct in_addr in;
74{
75 register u_long i = ntohl(in.s_addr);
76 register u_long net;
77 register struct in_ifaddr *ia;
78
79 if (IN_CLASSA(i))
80 net = i & IN_CLASSA_NET;
81 else if (IN_CLASSB(i))
82 net = i & IN_CLASSB_NET;
83 else if (IN_CLASSC(i))
84 net = i & IN_CLASSC_NET;
85 else if (IN_CLASSD(i))
86 net = i & IN_CLASSD_NET;
87 else
88 return (0);
89
90 /*
91 * Check whether network is a subnet;
92 * if so, return subnet number.
93 */
94 for (ia = in_ifaddr; ia; ia = ia->ia_next)
95 if (net == ia->ia_net)
96 return (i & ia->ia_subnetmask);
97 return (net);
98}
99
100#ifndef SUBNETSARELOCAL
101#define SUBNETSARELOCAL 1
102#endif
103int subnetsarelocal = SUBNETSARELOCAL;
104/*
105 * Return 1 if an internet address is for a ``local'' host
106 * (one to which we have a connection). If subnetsarelocal
107 * is true, this includes other subnets of the local net.
108 * Otherwise, it includes only the directly-connected (sub)nets.
109 */
110int
111in_localaddr(in)
112 struct in_addr in;
113{
114 register u_long i = ntohl(in.s_addr);
115 register struct in_ifaddr *ia;
116
117 if (subnetsarelocal) {
118 for (ia = in_ifaddr; ia; ia = ia->ia_next)
119 if ((i & ia->ia_netmask) == ia->ia_net)
120 return (1);
121 } else {
122 for (ia = in_ifaddr; ia; ia = ia->ia_next)
123 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
124 return (1);
125 }
126 return (0);
127}
128
129/*
130 * Determine whether an IP address is in a reserved set of addresses
131 * that may not be forwarded, or whether datagrams to that destination
132 * may be forwarded.
133 */
134int
135in_canforward(in)
136 struct in_addr in;
137{
138 register u_long i = ntohl(in.s_addr);
139 register u_long net;
140
141 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
142 return (0);
143 if (IN_CLASSA(i)) {
144 net = i & IN_CLASSA_NET;
145 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
146 return (0);
147 }
148 return (1);
149}
150
151/*
152 * Trim a mask in a sockaddr
153 */
154void
155in_socktrim(ap)
156struct sockaddr_in *ap;
157{
158 register char *cplim = (char *) &ap->sin_addr;
159 register char *cp = (char *) (&ap->sin_addr + 1);
160
161 ap->sin_len = 0;
162 while (--cp >= cplim)
163 if (*cp) {
164 (ap)->sin_len = cp - (char *) (ap) + 1;
165 break;
166 }
167}
168
169int in_interfaces; /* number of external internet interfaces */
170
171/*
172 * Generic internet control operations (ioctl's).
173 * Ifp is 0 if not an interface-specific ioctl.
174 */
175/* ARGSUSED */
176int
177in_control(so, cmd, data, ifp)
178 struct socket *so;
179 u_long cmd;
180 caddr_t data;
181 register struct ifnet *ifp;
182{
183 register struct ifreq *ifr = (struct ifreq *)data;
184 register struct in_ifaddr *ia = 0;
185 register struct ifaddr *ifa;
186 struct in_ifaddr *oia;
187 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
188 struct sockaddr_in oldaddr;
189 int error, hostIsNew, maskIsNew;
190 u_long i;
191 struct multi_kludge *mk;
192
193 /*
194 * Find address for this interface, if it exists.
195 */
196 if (ifp)
197 for (ia = in_ifaddr; ia; ia = ia->ia_next)
198 if (ia->ia_ifp == ifp)
199 break;
200
201 switch (cmd) {
202
203 case SIOCAIFADDR:
204 case SIOCDIFADDR:
205 if (ifra->ifra_addr.sin_family == AF_INET) {
206 for (oia = ia; ia; ia = ia->ia_next) {
207 if (ia->ia_ifp == ifp &&
208 ia->ia_addr.sin_addr.s_addr ==
209 ifra->ifra_addr.sin_addr.s_addr)
210 break;
211 }
212 if ((ifp->if_flags & IFF_POINTOPOINT)
213 && (cmd == SIOCAIFADDR)
214 && (ifra->ifra_dstaddr.sin_addr.s_addr
215 == INADDR_ANY)) {
216 return EDESTADDRREQ;
217 }
218 }
219 if (cmd == SIOCDIFADDR && ia == 0)
220 return (EADDRNOTAVAIL);
221 /* FALLTHROUGH */
222 case SIOCSIFADDR:
223 case SIOCSIFNETMASK:
224 case SIOCSIFDSTADDR:
225 if ((so->so_state & SS_PRIV) == 0)
226 return (EPERM);
227
228 if (ifp == 0)
229 panic("in_control");
230 if (ia == (struct in_ifaddr *)0) {
231 oia = (struct in_ifaddr *)
232 malloc(sizeof *oia, M_IFADDR, M_WAITOK);
233 if (oia == (struct in_ifaddr *)NULL)
234 return (ENOBUFS);
235 bzero((caddr_t)oia, sizeof *oia);
236 ia = in_ifaddr;
237 if (ia) {
238 for ( ; ia->ia_next; ia = ia->ia_next)
239 continue;
240 ia->ia_next = oia;
241 } else
242 in_ifaddr = oia;
243 ia = oia;
244 ifa = ifp->if_addrlist;
245 if (ifa) {
246 for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
247 continue;
248 ifa->ifa_next = (struct ifaddr *) ia;
249 } else
250 ifp->if_addrlist = (struct ifaddr *) ia;
251 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
252 ia->ia_ifa.ifa_dstaddr
253 = (struct sockaddr *)&ia->ia_dstaddr;
254 ia->ia_ifa.ifa_netmask
255 = (struct sockaddr *)&ia->ia_sockmask;
256 ia->ia_sockmask.sin_len = 8;
257 if (ifp->if_flags & IFF_BROADCAST) {
258 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
259 ia->ia_broadaddr.sin_family = AF_INET;
260 }
261 ia->ia_ifp = ifp;
262 if (!(ifp->if_flags & IFF_LOOPBACK))
263 in_interfaces++;
264 }
265 break;
266
267 case SIOCSIFBRDADDR:
268 if ((so->so_state & SS_PRIV) == 0)
269 return (EPERM);
270 /* FALLTHROUGH */
271
272 case SIOCGIFADDR:
273 case SIOCGIFNETMASK:
274 case SIOCGIFDSTADDR:
275 case SIOCGIFBRDADDR:
276 if (ia == (struct in_ifaddr *)0)
277 return (EADDRNOTAVAIL);
278 break;
279 }
280 switch (cmd) {
281
282 case SIOCGIFADDR:
283 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
284 break;
285
286 case SIOCGIFBRDADDR:
287 if ((ifp->if_flags & IFF_BROADCAST) == 0)
288 return (EINVAL);
289 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
290 break;
291
292 case SIOCGIFDSTADDR:
293 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
294 return (EINVAL);
295 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
296 break;
297
298 case SIOCGIFNETMASK:
299 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
300 break;
301
302 case SIOCSIFDSTADDR:
303 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
304 return (EINVAL);
305 oldaddr = ia->ia_dstaddr;
306 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
307 if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
308 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
309 ia->ia_dstaddr = oldaddr;
310 return (error);
311 }
312 if (ia->ia_flags & IFA_ROUTE) {
313 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
314 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
315 ia->ia_ifa.ifa_dstaddr =
316 (struct sockaddr *)&ia->ia_dstaddr;
317 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
318 }
319 break;
320
321 case SIOCSIFBRDADDR:
322 if ((ifp->if_flags & IFF_BROADCAST) == 0)
323 return (EINVAL);
324 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
325 break;
326
327 case SIOCSIFADDR:
328 return (in_ifinit(ifp, ia,
329 (struct sockaddr_in *) &ifr->ifr_addr, 1));
330
331 case SIOCSIFNETMASK:
332 i = ifra->ifra_addr.sin_addr.s_addr;
333 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
334 break;
335
336 case SIOCAIFADDR:
337 maskIsNew = 0;
338 hostIsNew = 1;
339 error = 0;
340 if (ia->ia_addr.sin_family == AF_INET) {
341 if (ifra->ifra_addr.sin_len == 0) {
342 ifra->ifra_addr = ia->ia_addr;
343 hostIsNew = 0;
344 } else if (ifra->ifra_addr.sin_addr.s_addr ==
345 ia->ia_addr.sin_addr.s_addr)
346 hostIsNew = 0;
347 }
348 if (ifra->ifra_mask.sin_len) {
349 in_ifscrub(ifp, ia);
350 ia->ia_sockmask = ifra->ifra_mask;
351 ia->ia_subnetmask =
352 ntohl(ia->ia_sockmask.sin_addr.s_addr);
353 maskIsNew = 1;
354 }
355 if ((ifp->if_flags & IFF_POINTOPOINT) &&
356 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
357 in_ifscrub(ifp, ia);
358 ia->ia_dstaddr = ifra->ifra_dstaddr;
359 maskIsNew = 1; /* We lie; but the effect's the same */
360 }
361 if (ifra->ifra_addr.sin_family == AF_INET &&
362 (hostIsNew || maskIsNew))
363 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
364 if ((ifp->if_flags & IFF_BROADCAST) &&
365 (ifra->ifra_broadaddr.sin_family == AF_INET))
366 ia->ia_broadaddr = ifra->ifra_broadaddr;
367 return (error);
368
369 case SIOCDIFADDR:
370 mk = malloc(sizeof *mk, M_IPMADDR, M_WAITOK);
371 if (!mk)
372 return ENOBUFS;
373
374 in_ifscrub(ifp, ia);
375 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
376 ifp->if_addrlist = ifa->ifa_next;
377 else {
378 while (ifa->ifa_next &&
379 (ifa->ifa_next != (struct ifaddr *)ia))
380 ifa = ifa->ifa_next;
381 if (ifa->ifa_next)
382 ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
383 else
384 printf("Couldn't unlink inifaddr from ifp\n");
385 }
386 oia = ia;
387 if (oia == (ia = in_ifaddr))
388 in_ifaddr = ia->ia_next;
389 else {
390 while (ia->ia_next && (ia->ia_next != oia))
391 ia = ia->ia_next;
392 if (ia->ia_next)
393 ia->ia_next = oia->ia_next;
394 else
395 printf("Didn't unlink inifadr from list\n");
396 }
397
398 if (!oia->ia_multiaddrs.lh_first) {
399 IFAFREE(&oia->ia_ifa);
400 FREE(mk, M_IPMADDR);
401 break;
402 }
403
404 /*
405 * Multicast address kludge:
406 * If there were any multicast addresses attached to this
407 * interface address, either move them to another address
408 * on this interface, or save them until such time as this
409 * interface is reconfigured for IP.
410 */
411 IFP_TO_IA(oia->ia_ifp, ia);
412 if (ia) { /* there is another address */
413 struct in_multi *inm;
414 for(inm = oia->ia_multiaddrs.lh_first; inm;
415 inm = inm->inm_entry.le_next) {
416 IFAFREE(&inm->inm_ia->ia_ifa);
417 ia->ia_ifa.ifa_refcnt++;
418 inm->inm_ia = ia;
419 LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm,
420 inm_entry);
421 }
422 FREE(mk, M_IPMADDR);
423 } else { /* last address on this if deleted, save */
424 struct in_multi *inm;
425
426 LIST_INIT(&mk->mk_head);
427 mk->mk_ifp = ifp;
428
429 for(inm = oia->ia_multiaddrs.lh_first; inm;
430 inm = inm->inm_entry.le_next) {
431 LIST_INSERT_HEAD(&mk->mk_head, inm, inm_entry);
432 }
433
434 if (mk->mk_head.lh_first) {
435 LIST_INSERT_HEAD(&in_mk, mk, mk_entry);
436 } else {
437 FREE(mk, M_IPMADDR);
438 }
439 }
440
441 IFAFREE((&oia->ia_ifa));
442 break;
443
444 default:
445 if (ifp == 0 || ifp->if_ioctl == 0)
446 return (EOPNOTSUPP);
447 return ((*ifp->if_ioctl)(ifp, cmd, data));
448 }
449 return (0);
450}
451
452/*
453 * Delete any existing route for an interface.
454 */
455void
456in_ifscrub(ifp, ia)
457 register struct ifnet *ifp;
458 register struct in_ifaddr *ia;
459{
460
461 if ((ia->ia_flags & IFA_ROUTE) == 0)
462 return;
463 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
464 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
465 else
466 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
467 ia->ia_flags &= ~IFA_ROUTE;
468}
469
470/*
471 * Initialize an interface's internet address
472 * and routing table entry.
473 */
474int
475in_ifinit(ifp, ia, sin, scrub)
476 register struct ifnet *ifp;
477 register struct in_ifaddr *ia;
478 struct sockaddr_in *sin;
479 int scrub;
480{
481 register u_long i = ntohl(sin->sin_addr.s_addr);
482 struct sockaddr_in oldaddr;
483 int s = splimp(), flags = RTF_UP, error;
484 struct multi_kludge *mk;
485
486 oldaddr = ia->ia_addr;
487 ia->ia_addr = *sin;
488 /*
489 * Give the interface a chance to initialize
490 * if this is its first address,
491 * and to validate the address if necessary.
492 */
493 if (ifp->if_ioctl &&
494 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
495 splx(s);
496 ia->ia_addr = oldaddr;
497 return (error);
498 }
499 splx(s);
500 if (scrub) {
501 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
502 in_ifscrub(ifp, ia);
503 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
504 }
505 if (IN_CLASSA(i))
506 ia->ia_netmask = IN_CLASSA_NET;
507 else if (IN_CLASSB(i))
508 ia->ia_netmask = IN_CLASSB_NET;
509 else
510 ia->ia_netmask = IN_CLASSC_NET;
511 /*
512 * The subnet mask usually includes at least the standard network part,
513 * but may may be smaller in the case of supernetting.
514 * If it is set, we believe it.
515 */
516 if (ia->ia_subnetmask == 0) {
517 ia->ia_subnetmask = ia->ia_netmask;
518 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
519 } else
520 ia->ia_netmask &= ia->ia_subnetmask;
521 ia->ia_net = i & ia->ia_netmask;
522 ia->ia_subnet = i & ia->ia_subnetmask;
523 in_socktrim(&ia->ia_sockmask);
524 /*
525 * Add route for the network.
526 */
527 ia->ia_ifa.ifa_metric = ifp->if_metric;
528 if (ifp->if_flags & IFF_BROADCAST) {
529 ia->ia_broadaddr.sin_addr.s_addr =
530 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
531 ia->ia_netbroadcast.s_addr =
532 htonl(ia->ia_net | ~ ia->ia_netmask);
533 } else if (ifp->if_flags & IFF_LOOPBACK) {
534 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
535 flags |= RTF_HOST;
536 } else if (ifp->if_flags & IFF_POINTOPOINT) {
537 if (ia->ia_dstaddr.sin_family != AF_INET)
538 return (0);
539 flags |= RTF_HOST;
540 }
541 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
542 ia->ia_flags |= IFA_ROUTE;
543
544 LIST_INIT(&ia->ia_multiaddrs);
545 /*
546 * If the interface supports multicast, join the "all hosts"
547 * multicast group on that interface.
548 */
549 if (ifp->if_flags & IFF_MULTICAST) {
550 struct in_addr addr;
551
552 /*
553 * Continuation of multicast address hack:
554 * If there was a multicast group list previously saved
555 * for this interface, then we re-attach it to the first
556 * address configured on the i/f.
557 */
558 for(mk = in_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
559 if(mk->mk_ifp == ifp) {
560 struct in_multi *inm;
561
562 for(inm = mk->mk_head.lh_first; inm;
563 inm = inm->inm_entry.le_next) {
564 IFAFREE(&inm->inm_ia->ia_ifa);
565 ia->ia_ifa.ifa_refcnt++;
566 inm->inm_ia = ia;
567 LIST_INSERT_HEAD(&ia->ia_multiaddrs,
568 inm, inm_entry);
569 }
570 LIST_REMOVE(mk, mk_entry);
571 free(mk, M_IPMADDR);
572 break;
573 }
574 }
575
576 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
577 in_addmulti(&addr, ifp);
578 }
579 return (error);
580}
581
582
583/*
584 * Return 1 if the address might be a local broadcast address.
585 */
586int
587in_broadcast(in, ifp)
588 struct in_addr in;
589 struct ifnet *ifp;
590{
591 register struct ifaddr *ifa;
592 u_long t;
593
594 if (in.s_addr == INADDR_BROADCAST ||
595 in.s_addr == INADDR_ANY)
596 return 1;
597 if ((ifp->if_flags & IFF_BROADCAST) == 0)
598 return 0;
599 t = ntohl(in.s_addr);
600 /*
601 * Look through the list of addresses for a match
602 * with a broadcast address.
603 */
604#define ia ((struct in_ifaddr *)ifa)
605 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
606 if (ifa->ifa_addr->sa_family == AF_INET &&
607 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
608 in.s_addr == ia->ia_netbroadcast.s_addr ||
609 /*
610 * Check for old-style (host 0) broadcast.
611 */
612 t == ia->ia_subnet || t == ia->ia_net))
613 return 1;
614 return (0);
615#undef ia
616}
617/*
618 * Add an address to the list of IP multicast addresses for a given interface.
619 */
620struct in_multi *
621in_addmulti(ap, ifp)
622 register struct in_addr *ap;
623 register struct ifnet *ifp;
624{
625 register struct in_multi *inm;
626 struct ifreq ifr;
627 struct in_ifaddr *ia;
628 int s = splnet();
629
630 /*
631 * See if address already in list.
632 */
633 IN_LOOKUP_MULTI(*ap, ifp, inm);
634 if (inm != NULL) {
635 /*
636 * Found it; just increment the reference count.
637 */
638 ++inm->inm_refcount;
639 }
640 else {
641 /*
642 * New address; allocate a new multicast record
643 * and link it into the interface's multicast list.
644 */
645 inm = (struct in_multi *)malloc(sizeof(*inm),
646 M_IPMADDR, M_NOWAIT);
647 if (inm == NULL) {
648 splx(s);
649 return (NULL);
650 }
651 inm->inm_addr = *ap;
652 inm->inm_ifp = ifp;
653 inm->inm_refcount = 1;
654 IFP_TO_IA(ifp, ia);
655 if (ia == NULL) {
656 free(inm, M_IPMADDR);
657 splx(s);
658 return (NULL);
659 }
660 inm->inm_ia = ia;
661 ia->ia_ifa.ifa_refcnt++; /* gain a reference */
662 LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_entry);
663
664 /*
665 * Ask the network driver to update its multicast reception
666 * filter appropriately for the new address.
667 */
668 ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET;
669 ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap;
670 if ((ifp->if_ioctl == NULL) ||
671 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
672 LIST_REMOVE(inm, inm_entry);
673 IFAFREE(&ia->ia_ifa); /* release reference */
674 free(inm, M_IPMADDR);
675 splx(s);
676 return (NULL);
677 }
678 /*
679 * Let IGMP know that we have joined a new IP multicast group.
680 */
681 igmp_joingroup(inm);
682 }
683 splx(s);
684 return (inm);
685}
686
687/*
688 * Delete a multicast address record.
689 */
690void
691in_delmulti(inm)
692 register struct in_multi *inm;
693{
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