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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)in.c        8.4 (Berkeley) 1/9/95
  30  * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
  31  */
  32
  33 #include "opt_bootp.h"
  34 #include "opt_carp.h"
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/sockio.h>
  39 #include <sys/malloc.h>
  40 #include <sys/proc.h>
  41 #include <sys/priv.h>
  42 #include <sys/msgport.h>
  43 #include <sys/socket.h>
  44
  45 #include <sys/kernel.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/if_types.h>
  51 #include <net/route.h>
  52 #include <net/netmsg2.h>
  53 #include <net/netisr2.h>
  54
  55 #include <netinet/in.h>
  56 #include <netinet/in_var.h>
  57 #include <netinet/in_pcb.h>
  58 #include <netinet/udp_var.h>
  59
  60 #include <netinet/igmp_var.h>
  61
  62 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
  63
  64 static int in_mask2len (struct in_addr *);
  65 static void in_len2mask (struct in_addr *, int);
  66 static int in_lifaddr_ioctl (u_long, caddr_t, struct ifnet *, struct thread *);
  67
  68 static void     in_socktrim (struct sockaddr_in *);
  69 static int      in_ifinit(struct ifnet *, struct in_ifaddr *,
  70                     const struct sockaddr_in *, int);
  71
  72 static int      in_control_internal(u_long, caddr_t, struct ifnet *,
  73                     struct thread *);
  74
  75 static int      in_addprefix(struct in_ifaddr *, int);
  76 static void     in_scrubprefix(struct in_ifaddr *);
  77
  78 static int subnetsarelocal = 0;
  79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  80     &subnetsarelocal, 0,
  81     "Count all internet addresses of subnets of the local net as local");
  82
  83 struct in_multihead in_multihead; /* XXX BSS initialization */
  84
  85 extern struct inpcbinfo ripcbinfo;
  86
  87 /*
  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.
  92  */
  93 int
  94 in_localaddr(struct in_addr in)
  95 {
  96         u_long i = ntohl(in.s_addr);
  97         struct in_ifaddr_container *iac;
  98         struct in_ifaddr *ia;
  99
 100         if (subnetsarelocal) {
 101                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 102                         ia = iac->ia;
 103
 104                         if ((i & ia->ia_netmask) == ia->ia_net)
 105                                 return (1);
 106                 }
 107         } else {
 108                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 109                         ia = iac->ia;
 110
 111                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
 112                                 return (1);
 113                 }
 114         }
 115         return (0);
 116 }
 117
 118 /*
 119  * Determine whether an IP address is in a reserved set of addresses
 120  * that may not be forwarded, or whether datagrams to that destination
 121  * may be forwarded.
 122  */
 123 int
 124 in_canforward(struct in_addr in)
 125 {
 126         u_long i = ntohl(in.s_addr);
 127         u_long net;
 128
 129         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
 130                 return (0);
 131         if (IN_CLASSA(i)) {
 132                 net = i & IN_CLASSA_NET;
 133                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 134                         return (0);
 135         }
 136         return (1);
 137 }
 138
 139 /*
 140  * Trim a mask in a sockaddr
 141  */
 142 static void
 143 in_socktrim(struct sockaddr_in *ap)
 144 {
 145     char *cplim = (char *) &ap->sin_addr;
 146     char *cp = (char *) (&ap->sin_addr + 1);
 147
 148     ap->sin_len = 0;
 149     while (--cp >= cplim)
 150         if (*cp) {
 151             (ap)->sin_len = cp - (char *) (ap) + 1;
 152             break;
 153         }
 154 }
 155
 156 static int
 157 in_mask2len(struct in_addr *mask)
 158 {
 159         int x, y;
 160         u_char *p;
 161
 162         p = (u_char *)mask;
 163         for (x = 0; x < sizeof *mask; x++) {
 164                 if (p[x] != 0xff)
 165                         break;
 166         }
 167         y = 0;
 168         if (x < sizeof *mask) {
 169                 for (y = 0; y < 8; y++) {
 170                         if ((p[x] & (0x80 >> y)) == 0)
 171                                 break;
 172                 }
 173         }
 174         return x * 8 + y;
 175 }
 176
 177 static void
 178 in_len2mask(struct in_addr *mask, int len)
 179 {
 180         int i;
 181         u_char *p;
 182
 183         p = (u_char *)mask;
 184         bzero(mask, sizeof *mask);
 185         for (i = 0; i < len / 8; i++)
 186                 p[i] = 0xff;
 187         if (len % 8)
 188                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 189 }
 190
 191 void
 192 in_control_dispatch(netmsg_t msg)
 193 {
 194         int error;
 195
 196         error = in_control(msg->control.nm_cmd, msg->control.nm_data,
 197             msg->control.nm_ifp, msg->control.nm_td);
 198         lwkt_replymsg(&msg->lmsg, error);
 199 }
 200
 201 static void
 202 in_control_internal_dispatch(netmsg_t msg)
 203 {
 204         int error;
 205
 206         error = in_control_internal(msg->control.nm_cmd,
 207                                     msg->control.nm_data,
 208                                     msg->control.nm_ifp,
 209                                     msg->control.nm_td);
 210         lwkt_replymsg(&msg->lmsg, error);
 211 }
 212
 213 /*
 214  * Generic internet control operations (ioctl's).
 215  * Ifp is 0 if not an interface-specific ioctl.
 216  *
 217  * NOTE! td might be NULL.
 218  */
 219 int
 220 in_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
 221 {
 222         struct netmsg_pru_control msg;
 223
 224         switch (cmd) {
 225         /* change address */
 226         case SIOCALIFADDR:
 227         case SIOCDLIFADDR:
 228         case SIOCSIFDSTADDR:
 229         case SIOCSIFBRDADDR:
 230         case SIOCSIFADDR:
 231         case SIOCSIFNETMASK:
 232         case SIOCAIFADDR:
 233         case SIOCDIFADDR:
 234                 /*
 235                  * Dispatch these SIOCs to netisr0.
 236                  */
 237                 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
 238                     in_control_internal_dispatch);
 239                 msg.nm_cmd = cmd;
 240                 msg.nm_data = data;
 241                 msg.nm_ifp = ifp;
 242                 msg.nm_td = td;
 243                 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
 244                 return msg.base.lmsg.ms_error;
 245
 246         default:
 247                 return in_control_internal(cmd, data, ifp, td);
 248         }
 249 }
 250
 251 static void
 252 in_ialink_dispatch(netmsg_t msg)
 253 {
 254         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 255         struct ifaddr_container *ifac;
 256         struct in_ifaddr_container *iac;
 257         int cpu = mycpuid;
 258
 259         crit_enter();
 260
 261         ifac = &ia->ia_ifa.ifa_containers[cpu];
 262         ASSERT_IFAC_VALID(ifac);
 263         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
 264                 ("ia is on in_ifaddrheads"));
 265
 266         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
 267         iac = &ifac->ifa_proto_u.u_in_ifac;
 268         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
 269
 270         crit_exit();
 271
 272         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 273 }
 274
 275 static void
 276 in_iaunlink_dispatch(netmsg_t msg)
 277 {
 278         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 279         struct ifaddr_container *ifac;
 280         struct in_ifaddr_container *iac;
 281         int cpu = mycpuid;
 282
 283         crit_enter();
 284
 285         ifac = &ia->ia_ifa.ifa_containers[cpu];
 286         ASSERT_IFAC_VALID(ifac);
 287         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 288                 ("ia is not on in_ifaddrheads"));
 289
 290         iac = &ifac->ifa_proto_u.u_in_ifac;
 291         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
 292         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
 293
 294         crit_exit();
 295
 296         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 297 }
 298
 299 static void
 300 in_iahashins_dispatch(netmsg_t msg)
 301 {
 302         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 303         struct ifaddr_container *ifac;
 304         struct in_ifaddr_container *iac;
 305         int cpu = mycpuid;
 306
 307         crit_enter();
 308
 309         ifac = &ia->ia_ifa.ifa_containers[cpu];
 310         ASSERT_IFAC_VALID(ifac);
 311         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 312                 ("ia is on in_ifaddrhashtbls"));
 313
 314         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
 315         iac = &ifac->ifa_proto_u.u_in_ifac;
 316         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 317                          iac, ia_hash);
 318
 319         crit_exit();
 320
 321         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 322 }
 323
 324 static void
 325 in_iahashrem_dispatch(netmsg_t msg)
 326 {
 327         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 328         struct ifaddr_container *ifac;
 329         struct in_ifaddr_container *iac;
 330         int cpu = mycpuid;
 331
 332         crit_enter();
 333
 334         ifac = &ia->ia_ifa.ifa_containers[cpu];
 335         ASSERT_IFAC_VALID(ifac);
 336         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
 337                 ("ia is not on in_ifaddrhashtbls"));
 338
 339         iac = &ifac->ifa_proto_u.u_in_ifac;
 340         LIST_REMOVE(iac, ia_hash);
 341         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
 342
 343         crit_exit();
 344
 345         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 346 }
 347
 348 static void
 349 in_ialink(struct in_ifaddr *ia)
 350 {
 351         struct netmsg_base msg;
 352
 353         netmsg_init(&msg, NULL, &curthread->td_msgport,
 354                     0, in_ialink_dispatch);
 355         msg.lmsg.u.ms_resultp = ia;
 356
 357         ifa_domsg(&msg.lmsg, 0);
 358 }
 359
 360 void
 361 in_iaunlink(struct in_ifaddr *ia)
 362 {
 363         struct netmsg_base msg;
 364
 365         netmsg_init(&msg, NULL, &curthread->td_msgport,
 366                     0, in_iaunlink_dispatch);
 367         msg.lmsg.u.ms_resultp = ia;
 368
 369         ifa_domsg(&msg.lmsg, 0);
 370 }
 371
 372 void
 373 in_iahash_insert(struct in_ifaddr *ia)
 374 {
 375         struct netmsg_base msg;
 376
 377         netmsg_init(&msg, NULL, &curthread->td_msgport,
 378                     0, in_iahashins_dispatch);
 379         msg.lmsg.u.ms_resultp = ia;
 380
 381         ifa_domsg(&msg.lmsg, 0);
 382 }
 383
 384 void
 385 in_iahash_remove(struct in_ifaddr *ia)
 386 {
 387         struct netmsg_base msg;
 388
 389         netmsg_init(&msg, NULL, &curthread->td_msgport,
 390                     0, in_iahashrem_dispatch);
 391         msg.lmsg.u.ms_resultp = ia;
 392
 393         ifa_domsg(&msg.lmsg, 0);
 394 }
 395
 396 static __inline struct in_ifaddr *
 397 in_ianext(struct in_ifaddr *oia)
 398 {
 399         struct ifaddr_container *ifac;
 400         struct in_ifaddr_container *iac;
 401
 402         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
 403         ASSERT_IFAC_VALID(ifac);
 404         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 405                 ("ia is not on in_ifaddrheads"));
 406
 407         iac = &ifac->ifa_proto_u.u_in_ifac;
 408         iac = TAILQ_NEXT(iac, ia_link);
 409         if (iac != NULL)
 410                 return iac->ia;
 411         else
 412                 return NULL;
 413 }
 414
 415 static int
 416 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
 417                     struct thread *td)
 418 {
 419         struct ifreq *ifr = (struct ifreq *)data;
 420         struct in_ifaddr *ia = NULL;
 421         struct in_addr dst;
 422         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 423         struct ifaddr_container *ifac;
 424         struct in_ifaddr_container *iac;
 425         struct sockaddr_in oldaddr;
 426         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
 427         int error = 0;
 428
 429         switch (cmd) {
 430         case SIOCALIFADDR:
 431         case SIOCDLIFADDR:
 432                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 433                         return error;
 434                 /* FALLTHROUGH */
 435         case SIOCGLIFADDR:
 436                 if (!ifp)
 437                         return EINVAL;
 438                 return in_lifaddr_ioctl(cmd, data, ifp, td);
 439         }
 440
 441         iaIsNew = 0;
 442         ifpWasUp = 0;
 443
 444         /*
 445          * Find address for this interface, if it exists.
 446          *
 447          * If an alias address was specified, find that one instead of
 448          * the first one on the interface, if possible
 449          */
 450         if (ifp) {
 451                 struct in_ifaddr *iap;
 452
 453                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 454                 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
 455                         iap = iac->ia;
 456                         if (iap->ia_ifp == ifp &&
 457                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 458                                 ia = iap;
 459                                 break;
 460                         }
 461                 }
 462                 if (ia == NULL) {
 463                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
 464                                       ifa_link) {
 465                                 iap = ifatoia(ifac->ifa);
 466                                 if (iap->ia_addr.sin_family == AF_INET) {
 467                                         ia = iap;
 468                                         break;
 469                                 }
 470                         }
 471                 }
 472
 473                 if (ifp->if_flags & IFF_UP)
 474                         ifpWasUp = 1;
 475         }
 476
 477         switch (cmd) {
 478         case SIOCAIFADDR:
 479         case SIOCDIFADDR:
 480                 if (ifp == NULL)
 481                         return (EADDRNOTAVAIL);
 482                 if (ifra->ifra_addr.sin_family == AF_INET) {
 483                         while (ia != NULL) {
 484                                 if (ia->ia_ifp == ifp  &&
 485                                     ia->ia_addr.sin_addr.s_addr ==
 486                                     ifra->ifra_addr.sin_addr.s_addr)
 487                                         break;
 488                                 ia = in_ianext(ia);
 489                         }
 490                         if ((ifp->if_flags & IFF_POINTOPOINT) &&
 491                             cmd == SIOCAIFADDR &&
 492                             ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
 493                                 return EDESTADDRREQ;
 494                         }
 495                 }
 496                 if (cmd == SIOCDIFADDR && ia == NULL)
 497                         return (EADDRNOTAVAIL);
 498                 /* FALLTHROUGH */
 499         case SIOCSIFADDR:
 500         case SIOCSIFNETMASK:
 501         case SIOCSIFDSTADDR:
 502                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 503                         return error;
 504
 505                 if (ifp == NULL)
 506                         return (EADDRNOTAVAIL);
 507
 508                 if (cmd == SIOCSIFDSTADDR &&
 509                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
 510                         return (EINVAL);
 511
 512                 if (ia == NULL) {
 513                         struct ifaddr *ifa;
 514                         int i;
 515
 516                         ia = ifa_create(sizeof(*ia));
 517                         ifa = &ia->ia_ifa;
 518
 519                         /*
 520                          * Setup per-CPU information
 521                          */
 522                         for (i = 0; i < ncpus; ++i) {
 523                                 ifac = &ifa->ifa_containers[i];
 524                                 iac = &ifac->ifa_proto_u.u_in_ifac;
 525                                 iac->ia = ia;
 526                                 iac->ia_ifac = ifac;
 527                         }
 528
 529                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 530                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 531                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 532                         ia->ia_sockmask.sin_len = 8;
 533                         ia->ia_sockmask.sin_family = AF_INET;
 534                         if (ifp->if_flags & IFF_BROADCAST) {
 535                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 536                                 ia->ia_broadaddr.sin_family = AF_INET;
 537                         }
 538                         ia->ia_ifp = ifp;
 539                         iaIsNew = 1;
 540
 541                         in_ialink(ia);
 542                         ifa_iflink(ifa, ifp, 1);
 543                 }
 544                 break;
 545
 546         case SIOCSIFBRDADDR:
 547                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 548                         return error;
 549                 /* FALLTHROUGH */
 550
 551         case SIOCGIFADDR:
 552         case SIOCGIFNETMASK:
 553         case SIOCGIFDSTADDR:
 554         case SIOCGIFBRDADDR:
 555                 if (ia == NULL)
 556                         return (EADDRNOTAVAIL);
 557                 break;
 558         }
 559
 560         switch (cmd) {
 561         case SIOCGIFADDR:
 562                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 563                 return (0);
 564
 565         case SIOCGIFBRDADDR:
 566                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 567                         return (EINVAL);
 568                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 569                 return (0);
 570
 571         case SIOCGIFDSTADDR:
 572                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 573                         return (EINVAL);
 574                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 575                 return (0);
 576
 577         case SIOCGIFNETMASK:
 578                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 579                 return (0);
 580
 581         case SIOCSIFDSTADDR:
 582                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
 583
 584                 oldaddr = ia->ia_dstaddr;
 585                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 586                 if (ifp->if_ioctl != NULL) {
 587                         ifnet_serialize_all(ifp);
 588                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 589                                               td->td_proc->p_ucred);
 590                         ifnet_deserialize_all(ifp);
 591                         if (error) {
 592                                 ia->ia_dstaddr = oldaddr;
 593                                 return (error);
 594                         }
 595                 }
 596                 if (ia->ia_flags & IFA_ROUTE) {
 597                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 598                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 599                         ia->ia_ifa.ifa_dstaddr =
 600                                         (struct sockaddr *)&ia->ia_dstaddr;
 601                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 602                 }
 603                 return (0);
 604
 605         case SIOCSIFBRDADDR:
 606                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 607                         return (EINVAL);
 608                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 609                 return (0);
 610
 611         case SIOCSIFADDR:
 612                 error = in_ifinit(ifp, ia,
 613                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
 614                 if (error != 0 && iaIsNew)
 615                         break;
 616                 if (error == 0) {
 617                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 618                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 619                         &ia->ia_ifa);
 620                 }
 621                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 622                         /*
 623                          * Interface is brought up by in_ifinit()
 624                          * (via ifp->if_ioctl).  We act as if the
 625                          * interface got IFF_UP flag turned on.
 626                          */
 627                         if_up(ifp);
 628                 }
 629                 return (0);
 630
 631         case SIOCSIFNETMASK:
 632                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 633                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 634                 return (0);
 635
 636         case SIOCAIFADDR:
 637                 maskIsNew = 0;
 638                 hostIsNew = 1;
 639                 error = 0;
 640                 if (ia->ia_addr.sin_family == AF_INET) {
 641                         if (ifra->ifra_addr.sin_len == 0) {
 642                                 ifra->ifra_addr = ia->ia_addr;
 643                                 hostIsNew = 0;
 644                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 645                                    ia->ia_addr.sin_addr.s_addr) {
 646                                 hostIsNew = 0;
 647                         }
 648                 }
 649                 if (ifra->ifra_mask.sin_len) {
 650                         in_ifscrub(ifp, ia);
 651                         ia->ia_sockmask = ifra->ifra_mask;
 652                         ia->ia_sockmask.sin_family = AF_INET;
 653                         ia->ia_subnetmask =
 654                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
 655                         maskIsNew = 1;
 656                 }
 657                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 658                     ifra->ifra_dstaddr.sin_family == AF_INET) {
 659                         in_ifscrub(ifp, ia);
 660                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 661                         maskIsNew  = 1; /* We lie; but the effect's the same */
 662                 }
 663                 if (ifra->ifra_addr.sin_family == AF_INET &&
 664                     (hostIsNew || maskIsNew))
 665                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 666
 667                 if (error != 0 && iaIsNew)
 668                         break;
 669
 670                 if ((ifp->if_flags & IFF_BROADCAST) &&
 671                     ifra->ifra_broadaddr.sin_family == AF_INET)
 672                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 673                 if (error == 0) {
 674                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 675                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 676                         &ia->ia_ifa);
 677                 }
 678                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 679                         /* See the comment in SIOCSIFADDR */
 680                         if_up(ifp);
 681                 }
 682                 return (error);
 683
 684         case SIOCDIFADDR:
 685                 /*
 686                  * in_ifscrub kills the interface route.
 687                  */
 688                 in_ifscrub(ifp, ia);
 689                 /*
 690                  * in_ifadown gets rid of all the rest of
 691                  * the routes.  This is not quite the right
 692                  * thing to do, but at least if we are running
 693                  * a routing process they will come back.
 694                  */
 695                 in_ifadown(&ia->ia_ifa, 1);
 696                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
 697                                     &ia->ia_ifa);
 698                 error = 0;
 699                 break;
 700
 701         default:
 702                 if (ifp == NULL || ifp->if_ioctl == NULL)
 703                         return (EOPNOTSUPP);
 704                 ifnet_serialize_all(ifp);
 705                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 706                 ifnet_deserialize_all(ifp);
 707                 return (error);
 708         }
 709
 710         KKASSERT(cmd == SIOCDIFADDR ||
 711                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
 712
 713         ifa_ifunlink(&ia->ia_ifa, ifp);
 714         in_iaunlink(ia);
 715
 716         if (cmd == SIOCDIFADDR) {
 717                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 718                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
 719                         in_iahash_remove(ia);
 720         }
 721 #ifdef INVARIANTS
 722         else {
 723                 /*
 724                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
 725                  * already taken care of the deletion from hash table
 726                  */
 727                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 728                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 729                         ("SIOC%cIFADDR failed on new ia, "
 730                          "but the new ia is still in hash table",
 731                          cmd == SIOCSIFADDR ? 'S' : 'A'));
 732         }
 733 #endif
 734
 735         ifa_destroy(&ia->ia_ifa);
 736
 737         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
 738             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
 739                 /*
 740                  * Though the address assignment failed, the
 741                  * interface is brought up by in_ifinit()
 742                  * (via ifp->if_ioctl).  With the hope that
 743                  * the interface has some valid addresses, we
 744                  * act as if IFF_UP flag was just set on the
 745                  * interface.
 746                  *
 747                  * NOTE:
 748                  * This could only be done after the failed
 749                  * address is unlinked from the global address
 750                  * list.
 751                  */
 752                 if_up(ifp);
 753         }
 754
 755         return (error);
 756 }
 757
 758 /*
 759  * SIOC[GAD]LIFADDR.
 760  *      SIOCGLIFADDR: get first address. (?!?)
 761  *      SIOCGLIFADDR with IFLR_PREFIX:
 762  *              get first address that matches the specified prefix.
 763  *      SIOCALIFADDR: add the specified address.
 764  *      SIOCALIFADDR with IFLR_PREFIX:
 765  *              EINVAL since we can't deduce hostid part of the address.
 766  *      SIOCDLIFADDR: delete the specified address.
 767  *      SIOCDLIFADDR with IFLR_PREFIX:
 768  *              delete the first address that matches the specified prefix.
 769  * return values:
 770  *      EINVAL on invalid parameters
 771  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 772  *      other values may be returned from in_ioctl()
 773  *
 774  * NOTE! td might be NULL.
 775  */
 776 static int
 777 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
 778 {
 779         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 780
 781         /* sanity checks */
 782         if (!data || !ifp) {
 783                 panic("invalid argument to in_lifaddr_ioctl");
 784                 /*NOTRECHED*/
 785         }
 786
 787         switch (cmd) {
 788         case SIOCGLIFADDR:
 789                 /* address must be specified on GET with IFLR_PREFIX */
 790                 if ((iflr->flags & IFLR_PREFIX) == 0)
 791                         break;
 792                 /*FALLTHROUGH*/
 793         case SIOCALIFADDR:
 794         case SIOCDLIFADDR:
 795                 /* address must be specified on ADD and DELETE */
 796                 if (iflr->addr.ss_family != AF_INET)
 797                         return EINVAL;
 798                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 799                         return EINVAL;
 800                 /* XXX need improvement */
 801                 if (iflr->dstaddr.ss_family
 802                  && iflr->dstaddr.ss_family != AF_INET)
 803                         return EINVAL;
 804                 if (iflr->dstaddr.ss_family
 805                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 806                         return EINVAL;
 807                 break;
 808         default: /*shouldn't happen*/
 809                 return EOPNOTSUPP;
 810         }
 811         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 812                 return EINVAL;
 813
 814         switch (cmd) {
 815         case SIOCALIFADDR:
 816             {
 817                 struct in_aliasreq ifra;
 818
 819                 if (iflr->flags & IFLR_PREFIX)
 820                         return EINVAL;
 821
 822                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 823                 bzero(&ifra, sizeof ifra);
 824                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
 825
 826                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 827
 828                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 829                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 830                                 iflr->dstaddr.ss_len);
 831                 }
 832
 833                 ifra.ifra_mask.sin_family = AF_INET;
 834                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 835                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 836
 837                 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp,
 838                     td);
 839             }
 840         case SIOCGLIFADDR:
 841         case SIOCDLIFADDR:
 842             {
 843                 struct ifaddr_container *ifac;
 844                 struct in_ifaddr *ia;
 845                 struct in_addr mask, candidate, match;
 846                 struct sockaddr_in *sin;
 847                 int cmp;
 848
 849                 bzero(&mask, sizeof mask);
 850                 if (iflr->flags & IFLR_PREFIX) {
 851                         /* lookup a prefix rather than address. */
 852                         in_len2mask(&mask, iflr->prefixlen);
 853
 854                         sin = (struct sockaddr_in *)&iflr->addr;
 855                         match.s_addr = sin->sin_addr.s_addr;
 856                         match.s_addr &= mask.s_addr;
 857
 858                         /* if you set extra bits, that's wrong */
 859                         if (match.s_addr != sin->sin_addr.s_addr)
 860                                 return EINVAL;
 861
 862                         cmp = 1;
 863                 } else {
 864                         if (cmd == SIOCGLIFADDR) {
 865                                 /* on getting an address, take the 1st match */
 866                                 match.s_addr = 0; /* gcc4 warning */
 867                                 cmp = 0;        /*XXX*/
 868                         } else {
 869                                 /* on deleting an address, do exact match */
 870                                 in_len2mask(&mask, 32);
 871                                 sin = (struct sockaddr_in *)&iflr->addr;
 872                                 match.s_addr = sin->sin_addr.s_addr;
 873
 874                                 cmp = 1;
 875                         }
 876                 }
 877
 878                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 879                         struct ifaddr *ifa = ifac->ifa;
 880
 881                         if (ifa->ifa_addr->sa_family != AF_INET6)
 882                                 continue;
 883                         if (!cmp)
 884                                 break;
 885                         candidate.s_addr =
 886                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 887                         candidate.s_addr &= mask.s_addr;
 888                         if (candidate.s_addr == match.s_addr)
 889                                 break;
 890                 }
 891                 if (ifac == NULL)
 892                         return EADDRNOTAVAIL;
 893                 ia = (struct in_ifaddr *)(ifac->ifa);
 894
 895                 if (cmd == SIOCGLIFADDR) {
 896                         /* fill in the if_laddrreq structure */
 897                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 898
 899                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 900                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 901                                         ia->ia_dstaddr.sin_len);
 902                         } else
 903                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 904
 905                         iflr->prefixlen =
 906                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 907
 908                         iflr->flags = 0;        /*XXX*/
 909
 910                         return 0;
 911                 } else {
 912                         struct in_aliasreq ifra;
 913
 914                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 915                         bzero(&ifra, sizeof ifra);
 916                         bcopy(iflr->iflr_name, ifra.ifra_name,
 917                                 sizeof ifra.ifra_name);
 918
 919                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 920                                 ia->ia_addr.sin_len);
 921                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 922                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 923                                         ia->ia_dstaddr.sin_len);
 924                         }
 925                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 926                                 ia->ia_sockmask.sin_len);
 927
 928                         return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra,
 929                             ifp, td);
 930                 }
 931             }
 932         }
 933
 934         return EOPNOTSUPP;      /*just for safety*/
 935 }
 936
 937 /*
 938  * Delete any existing route for an interface.
 939  */
 940 void
 941 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
 942 {
 943         in_scrubprefix(ia);
 944 }
 945
 946 /*
 947  * Initialize an interface's internet address
 948  * and routing table entry.
 949  */
 950 static int
 951 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
 952           const struct sockaddr_in *sin, int scrub)
 953 {
 954         u_long i = ntohl(sin->sin_addr.s_addr);
 955         struct sockaddr_in oldaddr;
 956         struct ifaddr_container *ifac;
 957         int flags = RTF_UP, error = 0;
 958         int was_hash = 0;
 959
 960         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 961         oldaddr = ia->ia_addr;
 962
 963         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
 964                 was_hash = 1;
 965                 in_iahash_remove(ia);
 966         }
 967
 968         ia->ia_addr = *sin;
 969         if (ia->ia_addr.sin_family == AF_INET)
 970                 in_iahash_insert(ia);
 971
 972         /*
 973          * Give the interface a chance to initialize
 974          * if this is its first address,
 975          * and to validate the address if necessary.
 976          */
 977         if (ifp->if_ioctl != NULL) {
 978                 ifnet_serialize_all(ifp);
 979                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
 980                 ifnet_deserialize_all(ifp);
 981                 if (error)
 982                         goto fail;
 983         }
 984
 985         /*
 986          * Delete old route, if requested.
 987          */
 988         if (scrub) {
 989                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 990                 in_ifscrub(ifp, ia);
 991                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 992         }
 993
 994         /*
 995          * Calculate netmask/subnetmask.
 996          */
 997         if (IN_CLASSA(i))
 998                 ia->ia_netmask = IN_CLASSA_NET;
 999         else if (IN_CLASSB(i))
1000                 ia->ia_netmask = IN_CLASSB_NET;
1001         else
1002                 ia->ia_netmask = IN_CLASSC_NET;
1003         /*
1004          * The subnet mask usually includes at least the standard network part,
1005          * but may may be smaller in the case of supernetting.
1006          * If it is set, we believe it.
1007          */
1008         if (ia->ia_subnetmask == 0) {
1009                 ia->ia_subnetmask = ia->ia_netmask;
1010                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1011         } else {
1012                 ia->ia_netmask &= ia->ia_subnetmask;
1013         }
1014         ia->ia_net = i & ia->ia_netmask;
1015         ia->ia_subnet = i & ia->ia_subnetmask;
1016         in_socktrim(&ia->ia_sockmask);
1017
1018         /*
1019          * Add route for the network.
1020          */
1021         ia->ia_ifa.ifa_metric = ifp->if_metric;
1022         if (ifp->if_flags & IFF_BROADCAST) {
1023                 ia->ia_broadaddr.sin_addr.s_addr =
1024                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1025                 ia->ia_netbroadcast.s_addr =
1026                         htonl(ia->ia_net | ~ ia->ia_netmask);
1027         } else if (ifp->if_flags & IFF_LOOPBACK) {
1028                 ia->ia_dstaddr = ia->ia_addr;
1029                 flags |= RTF_HOST;
1030         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1031                 if (ia->ia_dstaddr.sin_family != AF_INET)
1032                         return (0);
1033                 flags |= RTF_HOST;
1034         }
1035
1036         /*-
1037          * Don't add host routes for interface addresses of
1038          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1039          * possible to assign several such address pairs with consistent
1040          * results (no host route) and is required by BOOTP.
1041          *
1042          * XXX: This is ugly !  There should be a way for the caller to
1043          *      say that they don't want a host route.
1044          */
1045         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1046             ia->ia_netmask != IN_CLASSA_NET ||
1047             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1048                 error = in_addprefix(ia, flags);
1049                 if (error)
1050                         goto fail;
1051         }
1052
1053         /*
1054          * If the interface supports multicast, join the "all hosts"
1055          * multicast group on that interface.
1056          */
1057         if (ifp->if_flags & IFF_MULTICAST) {
1058                 struct in_addr addr;
1059
1060                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1061                 in_addmulti(&addr, ifp);
1062         }
1063         return (0);
1064 fail:
1065         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1066                 in_iahash_remove(ia);
1067
1068         ia->ia_addr = oldaddr;
1069         if (was_hash)
1070                 in_iahash_insert(ia);
1071         return (error);
1072 }
1073
1074 #define rtinitflags(x) \
1075         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
1076          ? RTF_HOST : 0)
1077
1078 /*
1079  * Add a route to prefix ("connected route" in cisco terminology).
1080  * Do nothing, if there are some interface addresses with the same
1081  * prefix already.  This function assumes that the 'target' parent
1082  * interface is UP.
1083  */
1084 static int
1085 in_addprefix(struct in_ifaddr *target, int flags)
1086 {
1087         struct in_ifaddr_container *iac;
1088         struct in_addr prefix, mask;
1089         int error;
1090
1091 #ifdef CARP
1092         /*
1093          * Don't add prefix routes for CARP interfaces.
1094          * Prefix routes creation is handled by CARP
1095          * interfaces themselves.
1096          */
1097         if (target->ia_ifp->if_type == IFT_CARP)
1098                 return 0;
1099 #endif
1100
1101         mask = target->ia_sockmask.sin_addr;
1102         if (flags & RTF_HOST) {
1103                 prefix = target->ia_dstaddr.sin_addr;
1104         } else {
1105                 prefix = target->ia_addr.sin_addr;
1106                 prefix.s_addr &= mask.s_addr;
1107         }
1108
1109         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1110                 struct in_ifaddr *ia = iac->ia;
1111                 struct in_addr p;
1112
1113                 /* Don't test against self */
1114                 if (ia == target)
1115                         continue;
1116
1117                 /* The tested address does not own a route entry */
1118                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1119                         continue;
1120
1121                 /* Prefix test */
1122                 if (rtinitflags(ia)) {
1123                         p = ia->ia_dstaddr.sin_addr;
1124                 } else {
1125                         p = ia->ia_addr.sin_addr;
1126                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1127                 }
1128                 if (prefix.s_addr != p.s_addr)
1129                         continue;
1130
1131                 /*
1132                  * If the to-be-added address and the curretly being
1133                  * tested address are not host addresses, we need to
1134                  * take subnetmask into consideration.
1135                  */
1136                 if (!(flags & RTF_HOST) && !rtinitflags(ia) &&
1137                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1138                         continue;
1139
1140                 /*
1141                  * If we got a matching prefix route inserted by other
1142                  * interface address, we don't need to bother.
1143                  */
1144                 return 0;
1145         }
1146
1147         /*
1148          * No one seem to have prefix route; insert it.
1149          */
1150         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1151         if (!error)
1152                 target->ia_flags |= IFA_ROUTE;
1153         return error;
1154 }
1155
1156 /*
1157  * Remove a route to prefix ("connected route" in cisco terminology).
1158  * Re-installs the route by using another interface address, if there's
1159  * one with the same prefix (otherwise we lose the route mistakenly).
1160  */
1161 static void
1162 in_scrubprefix(struct in_ifaddr *target)
1163 {
1164         struct in_ifaddr_container *iac;
1165         struct in_addr prefix, mask;
1166         int error;
1167
1168 #ifdef CARP
1169         /*
1170          * Don't scrub prefix routes for CARP interfaces.
1171          * Prefix routes deletion is handled by CARP
1172          * interfaces themselves.
1173          */
1174         if (target->ia_ifp->if_type == IFT_CARP)
1175                 return;
1176 #endif
1177
1178         if ((target->ia_flags & IFA_ROUTE) == 0)
1179                 return;
1180
1181         mask = target->ia_sockmask.sin_addr;
1182         if (rtinitflags(target)) {
1183                 prefix = target->ia_dstaddr.sin_addr;
1184         } else {
1185                 prefix = target->ia_addr.sin_addr;
1186                 prefix.s_addr &= mask.s_addr;
1187         }
1188
1189         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1190                 struct in_ifaddr *ia = iac->ia;
1191                 struct in_addr p;
1192
1193                 /* Don't test against self */
1194                 if (ia == target)
1195                         continue;
1196
1197                 /* The tested address already owns a route entry */
1198                 if (ia->ia_flags & IFA_ROUTE)
1199                         continue;
1200
1201                 /*
1202                  * The prefix route of the tested address should
1203                  * never be installed if its parent interface is
1204                  * not UP yet.
1205                  */
1206                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1207                         continue;
1208
1209 #ifdef CARP
1210                 /*
1211                  * Don't add prefix routes for CARP interfaces.
1212                  * Prefix routes creation is handled by CARP
1213                  * interfaces themselves.
1214                  */
1215                 if (ia->ia_ifp->if_type == IFT_CARP)
1216                         continue;
1217 #endif
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 == NULL || (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 /*
1300  * Add an address to the list of IP multicast addresses for a given interface.
1301  */
1302 struct in_multi *
1303 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1304 {
1305         struct in_multi *inm;
1306         int error;
1307         struct sockaddr_in sin;
1308         struct ifmultiaddr *ifma;
1309
1310         ASSERT_IN_NETISR(0);
1311
1312         /*
1313          * Call generic routine to add membership or increment
1314          * refcount.  It wants addresses in the form of a sockaddr,
1315          * so we build one here (being careful to zero the unused bytes).
1316          */
1317         bzero(&sin, sizeof sin);
1318         sin.sin_family = AF_INET;
1319         sin.sin_len = sizeof sin;
1320         sin.sin_addr = *ap;
1321         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1322         if (error)
1323                 return NULL;
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 != NULL)
1330                 return ifma->ifma_protospec;
1331
1332         inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO);
1333         inm->inm_addr = *ap;
1334         inm->inm_ifp = ifp;
1335         inm->inm_ifma = ifma;
1336         ifma->ifma_protospec = inm;
1337         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1338
1339         /*
1340          * Let IGMP know that we have joined a new IP multicast group.
1341          */
1342         igmp_joingroup(inm);
1343         return inm;
1344 }
1345
1346 /*
1347  * Delete a multicast address record.
1348  */
1349 void
1350 in_delmulti(struct in_multi *inm)
1351 {
1352         struct ifmultiaddr *ifma;
1353         struct in_multi my_inm;
1354
1355         ASSERT_IN_NETISR(0);
1356
1357         ifma = inm->inm_ifma;
1358         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1359         if (ifma->ifma_refcount == 1) {
1360                 /*
1361                  * No remaining claims to this record; let IGMP know that
1362                  * we are leaving the multicast group.
1363                  * But do it after the if_delmulti() which might reset
1364                  * the interface and nuke the packet.
1365                  */
1366                 my_inm = *inm ;
1367                 ifma->ifma_protospec = NULL;
1368                 LIST_REMOVE(inm, inm_link);
1369                 kfree(inm, M_IPMADDR);
1370         }
1371         /* XXX - should be separate API for when we have an ifma? */
1372         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1373         if (my_inm.inm_ifp != NULL)
1374                 igmp_leavegroup(&my_inm);
1375 }
1376
1377 static void
1378 in_ifdetach_dispatch(netmsg_t nmsg)
1379 {
1380         struct lwkt_msg *lmsg = &nmsg->lmsg;
1381         struct ifnet *ifp = lmsg->u.ms_resultp;
1382         int cpu;
1383
1384         in_pcbpurgeif0(&ripcbinfo, ifp);
1385         for (cpu = 0; cpu < ncpus2; ++cpu)
1386                 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1387
1388         lwkt_replymsg(lmsg, 0);
1389 }
1390
1391 void
1392 in_ifdetach(struct ifnet *ifp)
1393 {
1394         struct netmsg_base nmsg;
1395         struct lwkt_msg *lmsg = &nmsg.lmsg;
1396
1397         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1398             in_ifdetach_dispatch);
1399         lmsg->u.ms_resultp = ifp;
1400
1401         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1402 }