Merge branches 'master' and 'suser_to_priv'
[dragonfly.git] / sys / netinet / in.c
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
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 1.41 2008/08/17 05:20:10 sephe Exp $
36  */
37
38 #include "opt_bootp.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sockio.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 #include <sys/priv.h>
46 #include <sys/msgport.h>
47 #include <sys/socket.h>
48
49 #include <sys/kernel.h>
50 #include <sys/sysctl.h>
51 #include <sys/thread2.h>
52
53 #include <net/if.h>
54 #include <net/if_types.h>
55 #include <net/route.h>
56 #include <net/netmsg2.h>
57
58 #include <netinet/in.h>
59 #include <netinet/in_var.h>
60 #include <netinet/in_pcb.h>
61
62 #include <netinet/igmp_var.h>
63
64 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
65
66 static int in_mask2len (struct in_addr *);
67 static void in_len2mask (struct in_addr *, int);
68 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t,
69         struct ifnet *, struct thread *);
70
71 static void     in_socktrim (struct sockaddr_in *);
72 static int      in_ifinit(struct ifnet *, struct in_ifaddr *,
73                     const struct sockaddr_in *, int);
74
75 static void     in_control_dispatch(struct netmsg *);
76 static int      in_control_internal(u_long, caddr_t, struct ifnet *,
77                     struct thread *);
78
79 static int      in_addprefix(struct in_ifaddr *, int);
80 static void     in_scrubprefix(struct in_ifaddr *);
81
82 static int subnetsarelocal = 0;
83 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
84         &subnetsarelocal, 0, "");
85
86 struct in_multihead in_multihead; /* XXX BSS initialization */
87
88 extern struct inpcbinfo ripcbinfo;
89 extern struct inpcbinfo udbinfo;
90
91 /*
92  * Return 1 if an internet address is for a ``local'' host
93  * (one to which we have a connection).  If subnetsarelocal
94  * is true, this includes other subnets of the local net.
95  * Otherwise, it includes only the directly-connected (sub)nets.
96  */
97 int
98 in_localaddr(struct in_addr in)
99 {
100         u_long i = ntohl(in.s_addr);
101         struct in_ifaddr_container *iac;
102         struct in_ifaddr *ia;
103
104         if (subnetsarelocal) {
105                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
106                         ia = iac->ia;
107
108                         if ((i & ia->ia_netmask) == ia->ia_net)
109                                 return (1);
110                 }
111         } else {
112                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
113                         ia = iac->ia;
114
115                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
116                                 return (1);
117                 }
118         }
119         return (0);
120 }
121
122 /*
123  * Determine whether an IP address is in a reserved set of addresses
124  * that may not be forwarded, or whether datagrams to that destination
125  * may be forwarded.
126  */
127 int
128 in_canforward(struct in_addr in)
129 {
130         u_long i = ntohl(in.s_addr);
131         u_long net;
132
133         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
134                 return (0);
135         if (IN_CLASSA(i)) {
136                 net = i & IN_CLASSA_NET;
137                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
138                         return (0);
139         }
140         return (1);
141 }
142
143 /*
144  * Trim a mask in a sockaddr
145  */
146 static void
147 in_socktrim(struct sockaddr_in *ap)
148 {
149     char *cplim = (char *) &ap->sin_addr;
150     char *cp = (char *) (&ap->sin_addr + 1);
151
152     ap->sin_len = 0;
153     while (--cp >= cplim)
154         if (*cp) {
155             (ap)->sin_len = cp - (char *) (ap) + 1;
156             break;
157         }
158 }
159
160 static int
161 in_mask2len(struct in_addr *mask)
162 {
163         int x, y;
164         u_char *p;
165
166         p = (u_char *)mask;
167         for (x = 0; x < sizeof *mask; x++) {
168                 if (p[x] != 0xff)
169                         break;
170         }
171         y = 0;
172         if (x < sizeof *mask) {
173                 for (y = 0; y < 8; y++) {
174                         if ((p[x] & (0x80 >> y)) == 0)
175                                 break;
176                 }
177         }
178         return x * 8 + y;
179 }
180
181 static void
182 in_len2mask(struct in_addr *mask, int len)
183 {
184         int i;
185         u_char *p;
186
187         p = (u_char *)mask;
188         bzero(mask, sizeof *mask);
189         for (i = 0; i < len / 8; i++)
190                 p[i] = 0xff;
191         if (len % 8)
192                 p[i] = (0xff00 >> (len % 8)) & 0xff;
193 }
194
195 static int in_interfaces;       /* number of external internet interfaces */
196
197 struct in_control_arg {
198         u_long          cmd;
199         caddr_t         data;
200         struct ifnet    *ifp;
201         struct thread   *td;
202 };
203
204 static void
205 in_control_dispatch(struct netmsg *nmsg)
206 {
207         struct lwkt_msg *msg = &nmsg->nm_lmsg;
208         const struct in_control_arg *arg = msg->u.ms_resultp;
209         int error;
210
211         error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td);
212         lwkt_replymsg(msg, error);
213 }
214
215 /*
216  * Generic internet control operations (ioctl's).
217  * Ifp is 0 if not an interface-specific ioctl.
218  *
219  * NOTE! td might be NULL.
220  */
221 /* ARGSUSED */
222 int
223 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
224            struct thread *td)
225 {
226         struct netmsg nmsg;
227         struct in_control_arg arg;
228         struct lwkt_msg *msg;
229         int error;
230
231         switch (cmd) {
232         case SIOCALIFADDR:
233         case SIOCDLIFADDR:
234                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
235                         return error;
236                 /* FALLTHROUGH */
237         case SIOCGLIFADDR:
238                 if (!ifp)
239                         return EINVAL;
240                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
241         }
242
243         KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR,
244                 ("recursive SIOC%cLIFADDR!\n",
245                  cmd == SIOCDLIFADDR ? 'D' : 'A'));
246
247         /*
248          * IFADDR alterations are serialized by netisr0
249          */
250         switch (cmd) {
251         case SIOCSIFDSTADDR:
252         case SIOCSIFBRDADDR:
253         case SIOCSIFADDR:
254         case SIOCSIFNETMASK:
255         case SIOCAIFADDR:
256         case SIOCDIFADDR:
257                 bzero(&arg, sizeof(arg));
258                 arg.cmd = cmd;
259                 arg.data = data;
260                 arg.ifp = ifp;
261                 arg.td = td;
262
263                 netmsg_init(&nmsg, &curthread->td_msgport, 0,
264                             in_control_dispatch);
265                 msg = &nmsg.nm_lmsg;
266                 msg->u.ms_resultp = &arg;
267
268                 lwkt_domsg(cpu_portfn(0), msg, 0);
269                 return msg->ms_error;
270         default:
271                 return in_control_internal(cmd, data, ifp, td);
272         }
273 }
274
275 static void
276 in_ialink_dispatch(struct netmsg *nmsg)
277 {
278         struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
279         struct in_ifaddr *ia = lmsg->u.ms_resultp;
280         struct ifaddr_container *ifac;
281         struct in_ifaddr_container *iac;
282         int cpu = mycpuid;
283
284         crit_enter();
285
286         ifac = &ia->ia_ifa.ifa_containers[cpu];
287         ASSERT_IFAC_VALID(ifac);
288         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
289                 ("ia is on in_ifaddrheads\n"));
290
291         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
292         iac = &ifac->ifa_proto_u.u_in_ifac;
293         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
294
295         crit_exit();
296
297         ifa_forwardmsg(lmsg, cpu + 1);
298 }
299
300 static void
301 in_iaunlink_dispatch(struct netmsg *nmsg)
302 {
303         struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
304         struct in_ifaddr *ia = lmsg->u.ms_resultp;
305         struct ifaddr_container *ifac;
306         struct in_ifaddr_container *iac;
307         int cpu = mycpuid;
308
309         crit_enter();
310
311         ifac = &ia->ia_ifa.ifa_containers[cpu];
312         ASSERT_IFAC_VALID(ifac);
313         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
314                 ("ia is not on in_ifaddrheads\n"));
315
316         iac = &ifac->ifa_proto_u.u_in_ifac;
317         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
318         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
319
320         crit_exit();
321
322         ifa_forwardmsg(lmsg, cpu + 1);
323 }
324
325 static void
326 in_iahashins_dispatch(struct netmsg *nmsg)
327 {
328         struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
329         struct in_ifaddr *ia = lmsg->u.ms_resultp;
330         struct ifaddr_container *ifac;
331         struct in_ifaddr_container *iac;
332         int cpu = mycpuid;
333
334         crit_enter();
335
336         ifac = &ia->ia_ifa.ifa_containers[cpu];
337         ASSERT_IFAC_VALID(ifac);
338         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
339                 ("ia is on in_ifaddrhashtbls\n"));
340
341         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
342         iac = &ifac->ifa_proto_u.u_in_ifac;
343         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
344                          iac, ia_hash);
345
346         crit_exit();
347
348         ifa_forwardmsg(lmsg, cpu + 1);
349 }
350
351 static void
352 in_iahashrem_dispatch(struct netmsg *nmsg)
353 {
354         struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
355         struct in_ifaddr *ia = lmsg->u.ms_resultp;
356         struct ifaddr_container *ifac;
357         struct in_ifaddr_container *iac;
358         int cpu = mycpuid;
359
360         crit_enter();
361
362         ifac = &ia->ia_ifa.ifa_containers[cpu];
363         ASSERT_IFAC_VALID(ifac);
364         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
365                 ("ia is not on in_ifaddrhashtbls\n"));
366
367         iac = &ifac->ifa_proto_u.u_in_ifac;
368         LIST_REMOVE(iac, ia_hash);
369         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
370
371         crit_exit();
372
373         ifa_forwardmsg(lmsg, cpu + 1);
374 }
375
376 static void
377 in_ialink(struct in_ifaddr *ia)
378 {
379         struct netmsg nmsg;
380         struct lwkt_msg *lmsg;
381
382         netmsg_init(&nmsg, &curthread->td_msgport, 0, in_ialink_dispatch);
383         lmsg = &nmsg.nm_lmsg;
384         lmsg->u.ms_resultp = ia;
385
386         ifa_domsg(lmsg, 0);
387 }
388
389 void
390 in_iaunlink(struct in_ifaddr *ia)
391 {
392         struct netmsg nmsg;
393         struct lwkt_msg *lmsg;
394
395         netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iaunlink_dispatch);
396         lmsg = &nmsg.nm_lmsg;
397         lmsg->u.ms_resultp = ia;
398
399         ifa_domsg(lmsg, 0);
400 }
401
402 void
403 in_iahash_insert(struct in_ifaddr *ia)
404 {
405         struct netmsg nmsg;
406         struct lwkt_msg *lmsg;
407
408         netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashins_dispatch);
409         lmsg = &nmsg.nm_lmsg;
410         lmsg->u.ms_resultp = ia;
411
412         ifa_domsg(lmsg, 0);
413 }
414
415 void
416 in_iahash_remove(struct in_ifaddr *ia)
417 {
418         struct netmsg nmsg;
419         struct lwkt_msg *lmsg;
420
421         netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashrem_dispatch);
422         lmsg = &nmsg.nm_lmsg;
423         lmsg->u.ms_resultp = ia;
424
425         ifa_domsg(lmsg, 0);
426 }
427
428 static __inline struct in_ifaddr *
429 in_ianext(struct in_ifaddr *oia)
430 {
431         struct ifaddr_container *ifac;
432         struct in_ifaddr_container *iac;
433
434         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
435         ASSERT_IFAC_VALID(ifac);
436         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
437                 ("ia is not on in_ifaddrheads\n"));
438
439         iac = &ifac->ifa_proto_u.u_in_ifac;
440         iac = TAILQ_NEXT(iac, ia_link);
441         if (iac != NULL)
442                 return iac->ia;
443         else
444                 return NULL;
445 }
446
447 static int
448 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
449                     struct thread *td)
450 {
451         struct ifreq *ifr = (struct ifreq *)data;
452         struct in_ifaddr *ia = NULL;
453         struct in_addr dst;
454         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
455         struct ifaddr_container *ifac;
456         struct in_ifaddr_container *iac;
457         struct sockaddr_in oldaddr;
458         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
459         int error = 0;
460
461         iaIsNew = 0;
462         ifpWasUp = 0;
463
464         /*
465          * Find address for this interface, if it exists.
466          *
467          * If an alias address was specified, find that one instead of
468          * the first one on the interface, if possible
469          */
470         if (ifp) {
471                 struct in_ifaddr *iap;
472
473                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
474                 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
475                         iap = iac->ia;
476                         if (iap->ia_ifp == ifp &&
477                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
478                                 ia = iap;
479                                 break;
480                         }
481                 }
482                 if (ia == NULL) {
483                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
484                                       ifa_link) {
485                                 iap = ifatoia(ifac->ifa);
486                                 if (iap->ia_addr.sin_family == AF_INET) {
487                                         ia = iap;
488                                         break;
489                                 }
490                         }
491                 }
492
493                 if (ifp->if_flags & IFF_UP)
494                         ifpWasUp = 1;
495         }
496
497         switch (cmd) {
498         case SIOCAIFADDR:
499         case SIOCDIFADDR:
500                 if (ifp == NULL)
501                         return (EADDRNOTAVAIL);
502                 if (ifra->ifra_addr.sin_family == AF_INET) {
503                         while (ia != NULL) {
504                                 if (ia->ia_ifp == ifp  &&
505                                     ia->ia_addr.sin_addr.s_addr ==
506                                     ifra->ifra_addr.sin_addr.s_addr)
507                                         break;
508                                 ia = in_ianext(ia);
509                         }
510                         if ((ifp->if_flags & IFF_POINTOPOINT) &&
511                             cmd == SIOCAIFADDR &&
512                             ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
513                                 return EDESTADDRREQ;
514                         }
515                 }
516                 if (cmd == SIOCDIFADDR && ia == NULL)
517                         return (EADDRNOTAVAIL);
518                 /* FALLTHROUGH */
519         case SIOCSIFADDR:
520         case SIOCSIFNETMASK:
521         case SIOCSIFDSTADDR:
522                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
523                         return error;
524
525                 if (ifp == NULL)
526                         return (EADDRNOTAVAIL);
527
528                 if (cmd == SIOCSIFDSTADDR &&
529                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
530                         return (EINVAL);
531
532                 if (ia == NULL) {
533                         struct ifaddr *ifa;
534                         int i;
535
536                         ia = ifa_create(sizeof(*ia), M_WAITOK);
537                         ifa = &ia->ia_ifa;
538
539                         /*
540                          * Setup per-CPU information
541                          */
542                         for (i = 0; i < ncpus; ++i) {
543                                 ifac = &ifa->ifa_containers[i];
544                                 iac = &ifac->ifa_proto_u.u_in_ifac;
545                                 iac->ia = ia;
546                                 iac->ia_ifac = ifac;
547                         }
548
549                         /*
550                          * Protect from NETISR_IP traversing address list
551                          * while we're modifying it.
552                          */
553                         crit_enter();
554
555                         in_ialink(ia);
556                         ifa_iflink(ifa, ifp, 1);
557
558                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
559                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
560                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
561                         ia->ia_sockmask.sin_len = 8;
562                         ia->ia_sockmask.sin_family = AF_INET;
563                         if (ifp->if_flags & IFF_BROADCAST) {
564                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
565                                 ia->ia_broadaddr.sin_family = AF_INET;
566                         }
567                         ia->ia_ifp = ifp;
568                         if (!(ifp->if_flags & IFF_LOOPBACK))
569                                 in_interfaces++;
570                         iaIsNew = 1;
571
572                         crit_exit();
573                 }
574                 break;
575
576         case SIOCSIFBRDADDR:
577                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
578                         return error;
579                 /* FALLTHROUGH */
580
581         case SIOCGIFADDR:
582         case SIOCGIFNETMASK:
583         case SIOCGIFDSTADDR:
584         case SIOCGIFBRDADDR:
585                 if (ia == NULL)
586                         return (EADDRNOTAVAIL);
587                 break;
588         }
589
590         switch (cmd) {
591         case SIOCGIFADDR:
592                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
593                 return (0);
594
595         case SIOCGIFBRDADDR:
596                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
597                         return (EINVAL);
598                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
599                 return (0);
600
601         case SIOCGIFDSTADDR:
602                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
603                         return (EINVAL);
604                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
605                 return (0);
606
607         case SIOCGIFNETMASK:
608                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
609                 return (0);
610
611         case SIOCSIFDSTADDR:
612                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
613
614                 oldaddr = ia->ia_dstaddr;
615                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
616                 if (ifp->if_ioctl != NULL) {
617                         lwkt_serialize_enter(ifp->if_serializer);
618                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
619                                               td->td_proc->p_ucred);
620                         lwkt_serialize_exit(ifp->if_serializer);
621                         if (error) {
622                                 ia->ia_dstaddr = oldaddr;
623                                 return (error);
624                         }
625                 }
626                 if (ia->ia_flags & IFA_ROUTE) {
627                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
628                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
629                         ia->ia_ifa.ifa_dstaddr =
630                                         (struct sockaddr *)&ia->ia_dstaddr;
631                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
632                 }
633                 return (0);
634
635         case SIOCSIFBRDADDR:
636                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
637                         return (EINVAL);
638                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
639                 return (0);
640
641         case SIOCSIFADDR:
642                 error = in_ifinit(ifp, ia,
643                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
644                 if (error != 0 && iaIsNew)
645                         break;
646                 if (error == 0) {
647                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
648                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
649                         &ia->ia_ifa);
650                 }
651                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
652                         /*
653                          * Interface is brought up by in_ifinit()
654                          * (via ifp->if_ioctl).  We act as if the
655                          * interface got IFF_UP flag turned on.
656                          */
657                         if_up(ifp);
658                 }
659                 return (0);
660
661         case SIOCSIFNETMASK:
662                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
663                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
664                 return (0);
665
666         case SIOCAIFADDR:
667                 maskIsNew = 0;
668                 hostIsNew = 1;
669                 error = 0;
670                 if (ia->ia_addr.sin_family == AF_INET) {
671                         if (ifra->ifra_addr.sin_len == 0) {
672                                 ifra->ifra_addr = ia->ia_addr;
673                                 hostIsNew = 0;
674                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
675                                    ia->ia_addr.sin_addr.s_addr) {
676                                 hostIsNew = 0;
677                         }
678                 }
679                 if (ifra->ifra_mask.sin_len) {
680                         in_ifscrub(ifp, ia);
681                         ia->ia_sockmask = ifra->ifra_mask;
682                         ia->ia_sockmask.sin_family = AF_INET;
683                         ia->ia_subnetmask =
684                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
685                         maskIsNew = 1;
686                 }
687                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
688                     ifra->ifra_dstaddr.sin_family == AF_INET) {
689                         in_ifscrub(ifp, ia);
690                         ia->ia_dstaddr = ifra->ifra_dstaddr;
691                         maskIsNew  = 1; /* We lie; but the effect's the same */
692                 }
693                 if (ifra->ifra_addr.sin_family == AF_INET &&
694                     (hostIsNew || maskIsNew))
695                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
696
697                 if (error != 0 && iaIsNew)
698                         break;
699
700                 if ((ifp->if_flags & IFF_BROADCAST) &&
701                     ifra->ifra_broadaddr.sin_family == AF_INET)
702                         ia->ia_broadaddr = ifra->ifra_broadaddr;
703                 if (error == 0) {
704                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
705                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
706                         &ia->ia_ifa);
707                 }
708                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
709                         /* See the comment in SIOCSIFADDR */
710                         if_up(ifp);
711                 }
712                 return (error);
713
714         case SIOCDIFADDR:
715                 /*
716                  * in_ifscrub kills the interface route.
717                  */
718                 in_ifscrub(ifp, ia);
719                 /*
720                  * in_ifadown gets rid of all the rest of
721                  * the routes.  This is not quite the right
722                  * thing to do, but at least if we are running
723                  * a routing process they will come back.
724                  */
725                 in_ifadown(&ia->ia_ifa, 1);
726                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
727                                     &ia->ia_ifa);
728                 error = 0;
729                 break;
730
731         default:
732                 if (ifp == NULL || ifp->if_ioctl == NULL)
733                         return (EOPNOTSUPP);
734                 lwkt_serialize_enter(ifp->if_serializer);
735                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
736                 lwkt_serialize_exit(ifp->if_serializer);
737                 return (error);
738         }
739
740         KKASSERT(cmd == SIOCDIFADDR ||
741                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
742
743         ifa_ifunlink(&ia->ia_ifa, ifp);
744         in_iaunlink(ia);
745
746         if (cmd == SIOCDIFADDR) {
747                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
748                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
749                         in_iahash_remove(ia);
750         }
751 #ifdef INVARIANTS
752         else {
753                 /*
754                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
755                  * already taken care of the deletion from hash table
756                  */
757                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
758                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
759                         ("SIOC%cIFADDR failed on new ia, "
760                          "but the new ia is still in hash table\n",
761                          cmd == SIOCSIFADDR ? 'S' : 'A'));
762         }
763 #endif
764
765         ifa_destroy(&ia->ia_ifa);
766
767         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
768             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
769                 /*
770                  * Though the address assignment failed, the
771                  * interface is brought up by in_ifinit()
772                  * (via ifp->if_ioctl).  With the hope that
773                  * the interface has some valid addresses, we
774                  * act as if IFF_UP flag was just set on the
775                  * interface.
776                  *
777                  * NOTE:
778                  * This could only be done after the failed
779                  * address is unlinked from the global address
780                  * list.
781                  */
782                 if_up(ifp);
783         }
784
785         return (error);
786 }
787
788 /*
789  * SIOC[GAD]LIFADDR.
790  *      SIOCGLIFADDR: get first address. (?!?)
791  *      SIOCGLIFADDR with IFLR_PREFIX:
792  *              get first address that matches the specified prefix.
793  *      SIOCALIFADDR: add the specified address.
794  *      SIOCALIFADDR with IFLR_PREFIX:
795  *              EINVAL since we can't deduce hostid part of the address.
796  *      SIOCDLIFADDR: delete the specified address.
797  *      SIOCDLIFADDR with IFLR_PREFIX:
798  *              delete the first address that matches the specified prefix.
799  * return values:
800  *      EINVAL on invalid parameters
801  *      EADDRNOTAVAIL on prefix match failed/specified address not found
802  *      other values may be returned from in_ioctl()
803  *
804  * NOTE! td might be NULL.
805  */
806 static int
807 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
808                  struct thread *td)
809 {
810         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
811
812         /* sanity checks */
813         if (!data || !ifp) {
814                 panic("invalid argument to in_lifaddr_ioctl");
815                 /*NOTRECHED*/
816         }
817
818         switch (cmd) {
819         case SIOCGLIFADDR:
820                 /* address must be specified on GET with IFLR_PREFIX */
821                 if ((iflr->flags & IFLR_PREFIX) == 0)
822                         break;
823                 /*FALLTHROUGH*/
824         case SIOCALIFADDR:
825         case SIOCDLIFADDR:
826                 /* address must be specified on ADD and DELETE */
827                 if (iflr->addr.ss_family != AF_INET)
828                         return EINVAL;
829                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
830                         return EINVAL;
831                 /* XXX need improvement */
832                 if (iflr->dstaddr.ss_family
833                  && iflr->dstaddr.ss_family != AF_INET)
834                         return EINVAL;
835                 if (iflr->dstaddr.ss_family
836                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
837                         return EINVAL;
838                 break;
839         default: /*shouldn't happen*/
840                 return EOPNOTSUPP;
841         }
842         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
843                 return EINVAL;
844
845         switch (cmd) {
846         case SIOCALIFADDR:
847             {
848                 struct in_aliasreq ifra;
849
850                 if (iflr->flags & IFLR_PREFIX)
851                         return EINVAL;
852
853                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
854                 bzero(&ifra, sizeof ifra);
855                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
856
857                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
858
859                 if (iflr->dstaddr.ss_family) {  /*XXX*/
860                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
861                                 iflr->dstaddr.ss_len);
862                 }
863
864                 ifra.ifra_mask.sin_family = AF_INET;
865                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
866                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
867
868                 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
869             }
870         case SIOCGLIFADDR:
871         case SIOCDLIFADDR:
872             {
873                 struct ifaddr_container *ifac;
874                 struct in_ifaddr *ia;
875                 struct in_addr mask, candidate, match;
876                 struct sockaddr_in *sin;
877                 int cmp;
878
879                 bzero(&mask, sizeof mask);
880                 if (iflr->flags & IFLR_PREFIX) {
881                         /* lookup a prefix rather than address. */
882                         in_len2mask(&mask, iflr->prefixlen);
883
884                         sin = (struct sockaddr_in *)&iflr->addr;
885                         match.s_addr = sin->sin_addr.s_addr;
886                         match.s_addr &= mask.s_addr;
887
888                         /* if you set extra bits, that's wrong */
889                         if (match.s_addr != sin->sin_addr.s_addr)
890                                 return EINVAL;
891
892                         cmp = 1;
893                 } else {
894                         if (cmd == SIOCGLIFADDR) {
895                                 /* on getting an address, take the 1st match */
896                                 match.s_addr = 0; /* gcc4 warning */
897                                 cmp = 0;        /*XXX*/
898                         } else {
899                                 /* on deleting an address, do exact match */
900                                 in_len2mask(&mask, 32);
901                                 sin = (struct sockaddr_in *)&iflr->addr;
902                                 match.s_addr = sin->sin_addr.s_addr;
903
904                                 cmp = 1;
905                         }
906                 }
907
908                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
909                         struct ifaddr *ifa = ifac->ifa;
910
911                         if (ifa->ifa_addr->sa_family != AF_INET6)
912                                 continue;
913                         if (!cmp)
914                                 break;
915                         candidate.s_addr =
916                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
917                         candidate.s_addr &= mask.s_addr;
918                         if (candidate.s_addr == match.s_addr)
919                                 break;
920                 }
921                 if (ifac == NULL)
922                         return EADDRNOTAVAIL;
923                 ia = (struct in_ifaddr *)(ifac->ifa);
924
925                 if (cmd == SIOCGLIFADDR) {
926                         /* fill in the if_laddrreq structure */
927                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
928
929                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
930                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
931                                         ia->ia_dstaddr.sin_len);
932                         } else
933                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
934
935                         iflr->prefixlen =
936                                 in_mask2len(&ia->ia_sockmask.sin_addr);
937
938                         iflr->flags = 0;        /*XXX*/
939
940                         return 0;
941                 } else {
942                         struct in_aliasreq ifra;
943
944                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
945                         bzero(&ifra, sizeof ifra);
946                         bcopy(iflr->iflr_name, ifra.ifra_name,
947                                 sizeof ifra.ifra_name);
948
949                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
950                                 ia->ia_addr.sin_len);
951                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
952                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
953                                         ia->ia_dstaddr.sin_len);
954                         }
955                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
956                                 ia->ia_sockmask.sin_len);
957
958                         return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
959                                           ifp, td);
960                 }
961             }
962         }
963
964         return EOPNOTSUPP;      /*just for safety*/
965 }
966
967 /*
968  * Delete any existing route for an interface.
969  */
970 void
971 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
972 {
973         in_scrubprefix(ia);
974 }
975
976 /*
977  * Initialize an interface's internet address
978  * and routing table entry.
979  */
980 static int
981 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
982           const struct sockaddr_in *sin, int scrub)
983 {
984         u_long i = ntohl(sin->sin_addr.s_addr);
985         struct sockaddr_in oldaddr;
986         struct ifaddr_container *ifac;
987         int flags = RTF_UP, error = 0;
988         int was_hash = 0;
989
990         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
991         oldaddr = ia->ia_addr;
992
993         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
994                 was_hash = 1;
995                 in_iahash_remove(ia);
996         }
997
998         ia->ia_addr = *sin;
999         if (ia->ia_addr.sin_family == AF_INET)
1000                 in_iahash_insert(ia);
1001
1002         /*
1003          * Give the interface a chance to initialize
1004          * if this is its first address,
1005          * and to validate the address if necessary.
1006          */
1007         if (ifp->if_ioctl != NULL) {
1008                 lwkt_serialize_enter(ifp->if_serializer);
1009                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
1010                 lwkt_serialize_exit(ifp->if_serializer);
1011                 if (error)
1012                         goto fail;
1013         }
1014
1015         /*
1016          * Delete old route, if requested.
1017          */
1018         if (scrub) {
1019                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1020                 in_ifscrub(ifp, ia);
1021                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1022         }
1023
1024         /*
1025          * Calculate netmask/subnetmask.
1026          */
1027         if (IN_CLASSA(i))
1028                 ia->ia_netmask = IN_CLASSA_NET;
1029         else if (IN_CLASSB(i))
1030                 ia->ia_netmask = IN_CLASSB_NET;
1031         else
1032                 ia->ia_netmask = IN_CLASSC_NET;
1033         /*
1034          * The subnet mask usually includes at least the standard network part,
1035          * but may may be smaller in the case of supernetting.
1036          * If it is set, we believe it.
1037          */
1038         if (ia->ia_subnetmask == 0) {
1039                 ia->ia_subnetmask = ia->ia_netmask;
1040                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1041         } else {
1042                 ia->ia_netmask &= ia->ia_subnetmask;
1043         }
1044         ia->ia_net = i & ia->ia_netmask;
1045         ia->ia_subnet = i & ia->ia_subnetmask;
1046         in_socktrim(&ia->ia_sockmask);
1047
1048         /*
1049          * Add route for the network.
1050          */
1051         ia->ia_ifa.ifa_metric = ifp->if_metric;
1052         if (ifp->if_flags & IFF_BROADCAST) {
1053                 ia->ia_broadaddr.sin_addr.s_addr =
1054                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1055                 ia->ia_netbroadcast.s_addr =
1056                         htonl(ia->ia_net | ~ ia->ia_netmask);
1057         } else if (ifp->if_flags & IFF_LOOPBACK) {
1058                 ia->ia_dstaddr = ia->ia_addr;
1059                 flags |= RTF_HOST;
1060         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1061                 if (ia->ia_dstaddr.sin_family != AF_INET)
1062                         return (0);
1063                 flags |= RTF_HOST;
1064         }
1065
1066         /*-
1067          * Don't add host routes for interface addresses of
1068          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1069          * possible to assign several such address pairs with consistent
1070          * results (no host route) and is required by BOOTP.
1071          *
1072          * XXX: This is ugly !  There should be a way for the caller to
1073          *      say that they don't want a host route.
1074          */
1075         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1076             ia->ia_netmask != IN_CLASSA_NET ||
1077             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1078                 error = in_addprefix(ia, flags);
1079                 if (error)
1080                         goto fail;
1081         }
1082
1083         /*
1084          * If the interface supports multicast, join the "all hosts"
1085          * multicast group on that interface.
1086          */
1087         if (ifp->if_flags & IFF_MULTICAST) {
1088                 struct in_addr addr;
1089
1090                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1091                 in_addmulti(&addr, ifp);
1092         }
1093         return (0);
1094 fail:
1095         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1096                 in_iahash_remove(ia);
1097
1098         ia->ia_addr = oldaddr;
1099         if (was_hash)
1100                 in_iahash_insert(ia);
1101         return (error);
1102 }
1103
1104 #define rtinitflags(x) \
1105         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
1106          ? RTF_HOST : 0)
1107
1108 /*
1109  * Add a route to prefix ("connected route" in cisco terminology).
1110  * Do nothing, if there are some interface addresses with the same
1111  * prefix already.  This function assumes that the 'target' parent
1112  * interface is UP.
1113  */
1114 static int
1115 in_addprefix(struct in_ifaddr *target, int flags)
1116 {
1117         struct in_ifaddr_container *iac;
1118         struct in_addr prefix, mask;
1119         int error;
1120
1121         mask = target->ia_sockmask.sin_addr;
1122         if (flags & RTF_HOST) {
1123                 prefix = target->ia_dstaddr.sin_addr;
1124         } else {
1125                 prefix = target->ia_addr.sin_addr;
1126                 prefix.s_addr &= mask.s_addr;
1127         }
1128
1129         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1130                 struct in_ifaddr *ia = iac->ia;
1131                 struct in_addr p;
1132
1133                 /* Don't test against self */
1134                 if (ia == target)
1135                         continue;
1136
1137                 /* The tested address does not own a route entry */
1138                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1139                         continue;
1140
1141                 /* Prefix test */
1142                 if (rtinitflags(ia)) {
1143                         p = ia->ia_dstaddr.sin_addr;
1144                 } else {
1145                         p = ia->ia_addr.sin_addr;
1146                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1147                 }
1148                 if (prefix.s_addr != p.s_addr)
1149                         continue;
1150
1151                 /*
1152                  * If the to-be-added address and the curretly being
1153                  * tested address are not host addresses, we need to
1154                  * take subnetmask into consideration.
1155                  */
1156                 if (!(flags & RTF_HOST) && !rtinitflags(ia) &&
1157                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1158                         continue;
1159
1160                 /*
1161                  * If we got a matching prefix route inserted by other
1162                  * interface address, we don't need to bother.
1163                  */
1164                 return 0;
1165         }
1166
1167         /*
1168          * No one seem to have prefix route; insert it.
1169          */
1170         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1171         if (!error)
1172                 target->ia_flags |= IFA_ROUTE;
1173         return error;
1174 }
1175
1176 /*
1177  * Remove a route to prefix ("connected route" in cisco terminology).
1178  * Re-installs the route by using another interface address, if there's
1179  * one with the same prefix (otherwise we lose the route mistakenly).
1180  */
1181 static void
1182 in_scrubprefix(struct in_ifaddr *target)
1183 {
1184         struct in_ifaddr_container *iac;
1185         struct in_addr prefix, mask;
1186         int error;
1187
1188         if ((target->ia_flags & IFA_ROUTE) == 0)
1189                 return;
1190
1191         mask = target->ia_sockmask.sin_addr;
1192         if (rtinitflags(target)) {
1193                 prefix = target->ia_dstaddr.sin_addr;
1194         } else {
1195                 prefix = target->ia_addr.sin_addr;
1196                 prefix.s_addr &= mask.s_addr;
1197         }
1198
1199         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1200                 struct in_ifaddr *ia = iac->ia;
1201                 struct in_addr p;
1202
1203                 /* Don't test against self */
1204                 if (ia == target)
1205                         continue;
1206
1207                 /* The tested address already owns a route entry */
1208                 if (ia->ia_flags & IFA_ROUTE)
1209                         continue;
1210
1211                 /*
1212                  * The prefix route of the tested address should
1213                  * never be installed if its parent interface is
1214                  * not UP yet.
1215                  */
1216                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1217                         continue;
1218
1219                 /* Prefix test */
1220                 if (rtinitflags(ia)) {
1221                         p = ia->ia_dstaddr.sin_addr;
1222                 } else {
1223                         p = ia->ia_addr.sin_addr;
1224                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1225                 }
1226                 if (prefix.s_addr != p.s_addr)
1227                         continue;
1228
1229                 /*
1230                  * We don't need to test subnetmask here, as what we do
1231                  * in in_addprefix(), since if the the tested address's
1232                  * parent interface is UP, the tested address should own
1233                  * a prefix route entry and we would never reach here.
1234                  */
1235
1236                 /*
1237                  * If we got a matching prefix route, move IFA_ROUTE to him
1238                  */
1239                 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1240                 target->ia_flags &= ~IFA_ROUTE;
1241
1242                 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1243                 if (!error)
1244                         ia->ia_flags |= IFA_ROUTE;
1245                 return;
1246         }
1247
1248         /*
1249          * No candidates for this prefix route; just remove it.
1250          */
1251         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1252         target->ia_flags &= ~IFA_ROUTE;
1253 }
1254
1255 #undef rtinitflags
1256
1257 /*
1258  * Return 1 if the address might be a local broadcast address.
1259  */
1260 int
1261 in_broadcast(struct in_addr in, struct ifnet *ifp)
1262 {
1263         struct ifaddr_container *ifac;
1264         u_long t;
1265
1266         if (in.s_addr == INADDR_BROADCAST ||
1267             in.s_addr == INADDR_ANY)
1268                 return 1;
1269         if ((ifp->if_flags & IFF_BROADCAST) == 0)
1270                 return 0;
1271         t = ntohl(in.s_addr);
1272         /*
1273          * Look through the list of addresses for a match
1274          * with a broadcast address.
1275          */
1276 #define ia ((struct in_ifaddr *)ifa)
1277         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1278                 struct ifaddr *ifa = ifac->ifa;
1279
1280                 if (ifa->ifa_addr->sa_family == AF_INET &&
1281                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1282                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1283                      /*
1284                       * Check for old-style (host 0) broadcast.
1285                       */
1286                      t == ia->ia_subnet || t == ia->ia_net) &&
1287                      /*
1288                       * Check for an all one subnetmask. These
1289                       * only exist when an interface gets a secondary
1290                       * address.
1291                       */
1292                      ia->ia_subnetmask != (u_long)0xffffffff)
1293                             return 1;
1294         }
1295         return (0);
1296 #undef ia
1297 }
1298 /*
1299  * Add an address to the list of IP multicast addresses for a given interface.
1300  */
1301 struct in_multi *
1302 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1303 {
1304         struct in_multi *inm;
1305         int error;
1306         struct sockaddr_in sin;
1307         struct ifmultiaddr *ifma;
1308
1309         /*
1310          * Call generic routine to add membership or increment
1311          * refcount.  It wants addresses in the form of a sockaddr,
1312          * so we build one here (being careful to zero the unused bytes).
1313          */
1314         bzero(&sin, sizeof sin);
1315         sin.sin_family = AF_INET;
1316         sin.sin_len = sizeof sin;
1317         sin.sin_addr = *ap;
1318         crit_enter();
1319         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1320         if (error) {
1321                 crit_exit();
1322                 return 0;
1323         }
1324
1325         /*
1326          * If ifma->ifma_protospec is null, then if_addmulti() created
1327          * a new record.  Otherwise, we are done.
1328          */
1329         if (ifma->ifma_protospec != 0) {
1330                 crit_exit();
1331                 return ifma->ifma_protospec;
1332         }
1333
1334         /* XXX - if_addmulti uses M_WAITOK.  Can this really be called
1335            at interrupt time?  If so, need to fix if_addmulti. XXX */
1336         inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
1337         inm->inm_addr = *ap;
1338         inm->inm_ifp = ifp;
1339         inm->inm_ifma = ifma;
1340         ifma->ifma_protospec = inm;
1341         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1342
1343         /*
1344          * Let IGMP know that we have joined a new IP multicast group.
1345          */
1346         igmp_joingroup(inm);
1347         crit_exit();
1348         return (inm);
1349 }
1350
1351 /*
1352  * Delete a multicast address record.
1353  */
1354 void
1355 in_delmulti(struct in_multi *inm)
1356 {
1357         struct ifmultiaddr *ifma;
1358         struct in_multi my_inm;
1359
1360         crit_enter();
1361         ifma = inm->inm_ifma;
1362         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1363         if (ifma->ifma_refcount == 1) {
1364                 /*
1365                  * No remaining claims to this record; let IGMP know that
1366                  * we are leaving the multicast group.
1367                  * But do it after the if_delmulti() which might reset
1368                  * the interface and nuke the packet.
1369                  */
1370                 my_inm = *inm ;
1371                 ifma->ifma_protospec = 0;
1372                 LIST_REMOVE(inm, inm_link);
1373                 kfree(inm, M_IPMADDR);
1374         }
1375         /* XXX - should be separate API for when we have an ifma? */
1376         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1377         if (my_inm.inm_ifp != NULL)
1378                 igmp_leavegroup(&my_inm);
1379         crit_exit();
1380 }
1381
1382 void
1383 in_ifdetach(struct ifnet *ifp)
1384 {
1385         in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
1386         in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);
1387 }