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 (struct socket *, u_long, caddr_t,
  67         struct ifnet *, struct thread *);
  68
  69 static void     in_socktrim (struct sockaddr_in *);
  70 static int      in_ifinit(struct ifnet *, struct in_ifaddr *,
  71                     const struct sockaddr_in *, int);
  72
  73 static int      in_control_internal(u_long, caddr_t, struct ifnet *,
  74                     struct thread *);
  75
  76 static int      in_addprefix(struct in_ifaddr *, int);
  77 static void     in_scrubprefix(struct in_ifaddr *);
  78
  79 static int subnetsarelocal = 0;
  80 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  81     &subnetsarelocal, 0,
  82     "Count all internet addresses of subnets of the local net as local");
  83
  84 struct in_multihead in_multihead; /* XXX BSS initialization */
  85
  86 extern struct inpcbinfo ripcbinfo;
  87
  88 /*
  89  * Return 1 if an internet address is for a ``local'' host
  90  * (one to which we have a connection).  If subnetsarelocal
  91  * is true, this includes other subnets of the local net.
  92  * Otherwise, it includes only the directly-connected (sub)nets.
  93  */
  94 int
  95 in_localaddr(struct in_addr in)
  96 {
  97         u_long i = ntohl(in.s_addr);
  98         struct in_ifaddr_container *iac;
  99         struct in_ifaddr *ia;
 100
 101         if (subnetsarelocal) {
 102                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 103                         ia = iac->ia;
 104
 105                         if ((i & ia->ia_netmask) == ia->ia_net)
 106                                 return (1);
 107                 }
 108         } else {
 109                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 110                         ia = iac->ia;
 111
 112                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
 113                                 return (1);
 114                 }
 115         }
 116         return (0);
 117 }
 118
 119 /*
 120  * Determine whether an IP address is in a reserved set of addresses
 121  * that may not be forwarded, or whether datagrams to that destination
 122  * may be forwarded.
 123  */
 124 int
 125 in_canforward(struct in_addr in)
 126 {
 127         u_long i = ntohl(in.s_addr);
 128         u_long net;
 129
 130         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
 131                 return (0);
 132         if (IN_CLASSA(i)) {
 133                 net = i & IN_CLASSA_NET;
 134                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 135                         return (0);
 136         }
 137         return (1);
 138 }
 139
 140 /*
 141  * Trim a mask in a sockaddr
 142  */
 143 static void
 144 in_socktrim(struct sockaddr_in *ap)
 145 {
 146     char *cplim = (char *) &ap->sin_addr;
 147     char *cp = (char *) (&ap->sin_addr + 1);
 148
 149     ap->sin_len = 0;
 150     while (--cp >= cplim)
 151         if (*cp) {
 152             (ap)->sin_len = cp - (char *) (ap) + 1;
 153             break;
 154         }
 155 }
 156
 157 static int
 158 in_mask2len(struct in_addr *mask)
 159 {
 160         int x, y;
 161         u_char *p;
 162
 163         p = (u_char *)mask;
 164         for (x = 0; x < sizeof *mask; x++) {
 165                 if (p[x] != 0xff)
 166                         break;
 167         }
 168         y = 0;
 169         if (x < sizeof *mask) {
 170                 for (y = 0; y < 8; y++) {
 171                         if ((p[x] & (0x80 >> y)) == 0)
 172                                 break;
 173                 }
 174         }
 175         return x * 8 + y;
 176 }
 177
 178 static void
 179 in_len2mask(struct in_addr *mask, int len)
 180 {
 181         int i;
 182         u_char *p;
 183
 184         p = (u_char *)mask;
 185         bzero(mask, sizeof *mask);
 186         for (i = 0; i < len / 8; i++)
 187                 p[i] = 0xff;
 188         if (len % 8)
 189                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 190 }
 191
 192 static int in_interfaces;       /* number of external internet interfaces */
 193
 194 void
 195 in_control_dispatch(netmsg_t msg)
 196 {
 197         int error;
 198
 199         error = in_control(msg->base.nm_so, msg->control.nm_cmd,
 200             msg->control.nm_data, msg->control.nm_ifp, msg->control.nm_td);
 201         lwkt_replymsg(&msg->lmsg, error);
 202 }
 203
 204 static void
 205 in_control_internal_dispatch(netmsg_t msg)
 206 {
 207         int error;
 208
 209         error = in_control_internal(msg->control.nm_cmd,
 210                                     msg->control.nm_data,
 211                                     msg->control.nm_ifp,
 212                                     msg->control.nm_td);
 213         lwkt_replymsg(&msg->lmsg, error);
 214 }
 215
 216 /*
 217  * Generic internet control operations (ioctl's).
 218  * Ifp is 0 if not an interface-specific ioctl.
 219  *
 220  * NOTE! td might be NULL.
 221  */
 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_pru_control msg;
 227         int error;
 228
 229         switch (cmd) {
 230         case SIOCALIFADDR:
 231         case SIOCDLIFADDR:
 232                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 233                         return error;
 234                 /* FALLTHROUGH */
 235         case SIOCGLIFADDR:
 236                 if (!ifp)
 237                         return EINVAL;
 238                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 239
 240         /* change address */
 241         case SIOCSIFDSTADDR:
 242         case SIOCSIFBRDADDR:
 243         case SIOCSIFADDR:
 244         case SIOCSIFNETMASK:
 245         case SIOCAIFADDR:
 246         case SIOCDIFADDR:
 247                 /*
 248                  * Dispatch these SIOCs to netisr0.
 249                  */
 250                 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
 251                     in_control_internal_dispatch);
 252                 msg.nm_cmd = cmd;
 253                 msg.nm_data = data;
 254                 msg.nm_ifp = ifp;
 255                 msg.nm_td = td;
 256                 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
 257                 return msg.base.lmsg.ms_error;
 258
 259         default:
 260                 return in_control_internal(cmd, data, ifp, td);
 261         }
 262 }
 263
 264 static void
 265 in_ialink_dispatch(netmsg_t msg)
 266 {
 267         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 268         struct ifaddr_container *ifac;
 269         struct in_ifaddr_container *iac;
 270         int cpu = mycpuid;
 271
 272         crit_enter();
 273
 274         ifac = &ia->ia_ifa.ifa_containers[cpu];
 275         ASSERT_IFAC_VALID(ifac);
 276         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
 277                 ("ia is on in_ifaddrheads"));
 278
 279         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
 280         iac = &ifac->ifa_proto_u.u_in_ifac;
 281         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
 282
 283         crit_exit();
 284
 285         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 286 }
 287
 288 static void
 289 in_iaunlink_dispatch(netmsg_t msg)
 290 {
 291         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 292         struct ifaddr_container *ifac;
 293         struct in_ifaddr_container *iac;
 294         int cpu = mycpuid;
 295
 296         crit_enter();
 297
 298         ifac = &ia->ia_ifa.ifa_containers[cpu];
 299         ASSERT_IFAC_VALID(ifac);
 300         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 301                 ("ia is not on in_ifaddrheads"));
 302
 303         iac = &ifac->ifa_proto_u.u_in_ifac;
 304         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
 305         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
 306
 307         crit_exit();
 308
 309         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 310 }
 311
 312 static void
 313 in_iahashins_dispatch(netmsg_t msg)
 314 {
 315         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 316         struct ifaddr_container *ifac;
 317         struct in_ifaddr_container *iac;
 318         int cpu = mycpuid;
 319
 320         crit_enter();
 321
 322         ifac = &ia->ia_ifa.ifa_containers[cpu];
 323         ASSERT_IFAC_VALID(ifac);
 324         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 325                 ("ia is on in_ifaddrhashtbls"));
 326
 327         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
 328         iac = &ifac->ifa_proto_u.u_in_ifac;
 329         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 330                          iac, ia_hash);
 331
 332         crit_exit();
 333
 334         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 335 }
 336
 337 static void
 338 in_iahashrem_dispatch(netmsg_t msg)
 339 {
 340         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 341         struct ifaddr_container *ifac;
 342         struct in_ifaddr_container *iac;
 343         int cpu = mycpuid;
 344
 345         crit_enter();
 346
 347         ifac = &ia->ia_ifa.ifa_containers[cpu];
 348         ASSERT_IFAC_VALID(ifac);
 349         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
 350                 ("ia is not on in_ifaddrhashtbls"));
 351
 352         iac = &ifac->ifa_proto_u.u_in_ifac;
 353         LIST_REMOVE(iac, ia_hash);
 354         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
 355
 356         crit_exit();
 357
 358         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 359 }
 360
 361 static void
 362 in_ialink(struct in_ifaddr *ia)
 363 {
 364         struct netmsg_base msg;
 365
 366         netmsg_init(&msg, NULL, &curthread->td_msgport,
 367                     0, in_ialink_dispatch);
 368         msg.lmsg.u.ms_resultp = ia;
 369
 370         ifa_domsg(&msg.lmsg, 0);
 371 }
 372
 373 void
 374 in_iaunlink(struct in_ifaddr *ia)
 375 {
 376         struct netmsg_base msg;
 377
 378         netmsg_init(&msg, NULL, &curthread->td_msgport,
 379                     0, in_iaunlink_dispatch);
 380         msg.lmsg.u.ms_resultp = ia;
 381
 382         ifa_domsg(&msg.lmsg, 0);
 383 }
 384
 385 void
 386 in_iahash_insert(struct in_ifaddr *ia)
 387 {
 388         struct netmsg_base msg;
 389
 390         netmsg_init(&msg, NULL, &curthread->td_msgport,
 391                     0, in_iahashins_dispatch);
 392         msg.lmsg.u.ms_resultp = ia;
 393
 394         ifa_domsg(&msg.lmsg, 0);
 395 }
 396
 397 void
 398 in_iahash_remove(struct in_ifaddr *ia)
 399 {
 400         struct netmsg_base msg;
 401
 402         netmsg_init(&msg, NULL, &curthread->td_msgport,
 403                     0, in_iahashrem_dispatch);
 404         msg.lmsg.u.ms_resultp = ia;
 405
 406         ifa_domsg(&msg.lmsg, 0);
 407 }
 408
 409 static __inline struct in_ifaddr *
 410 in_ianext(struct in_ifaddr *oia)
 411 {
 412         struct ifaddr_container *ifac;
 413         struct in_ifaddr_container *iac;
 414
 415         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
 416         ASSERT_IFAC_VALID(ifac);
 417         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 418                 ("ia is not on in_ifaddrheads"));
 419
 420         iac = &ifac->ifa_proto_u.u_in_ifac;
 421         iac = TAILQ_NEXT(iac, ia_link);
 422         if (iac != NULL)
 423                 return iac->ia;
 424         else
 425                 return NULL;
 426 }
 427
 428 static int
 429 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
 430                     struct thread *td)
 431 {
 432         struct ifreq *ifr = (struct ifreq *)data;
 433         struct in_ifaddr *ia = NULL;
 434         struct in_addr dst;
 435         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 436         struct ifaddr_container *ifac;
 437         struct in_ifaddr_container *iac;
 438         struct sockaddr_in oldaddr;
 439         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
 440         int error = 0;
 441
 442         iaIsNew = 0;
 443         ifpWasUp = 0;
 444
 445         /*
 446          * Find address for this interface, if it exists.
 447          *
 448          * If an alias address was specified, find that one instead of
 449          * the first one on the interface, if possible
 450          */
 451         if (ifp) {
 452                 struct in_ifaddr *iap;
 453
 454                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 455                 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
 456                         iap = iac->ia;
 457                         if (iap->ia_ifp == ifp &&
 458                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 459                                 ia = iap;
 460                                 break;
 461                         }
 462                 }
 463                 if (ia == NULL) {
 464                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
 465                                       ifa_link) {
 466                                 iap = ifatoia(ifac->ifa);
 467                                 if (iap->ia_addr.sin_family == AF_INET) {
 468                                         ia = iap;
 469                                         break;
 470                                 }
 471                         }
 472                 }
 473
 474                 if (ifp->if_flags & IFF_UP)
 475                         ifpWasUp = 1;
 476         }
 477
 478         switch (cmd) {
 479         case SIOCAIFADDR:
 480         case SIOCDIFADDR:
 481                 if (ifp == NULL)
 482                         return (EADDRNOTAVAIL);
 483                 if (ifra->ifra_addr.sin_family == AF_INET) {
 484                         while (ia != NULL) {
 485                                 if (ia->ia_ifp == ifp  &&
 486                                     ia->ia_addr.sin_addr.s_addr ==
 487                                     ifra->ifra_addr.sin_addr.s_addr)
 488                                         break;
 489                                 ia = in_ianext(ia);
 490                         }
 491                         if ((ifp->if_flags & IFF_POINTOPOINT) &&
 492                             cmd == SIOCAIFADDR &&
 493                             ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
 494                                 return EDESTADDRREQ;
 495                         }
 496                 }
 497                 if (cmd == SIOCDIFADDR && ia == NULL)
 498                         return (EADDRNOTAVAIL);
 499                 /* FALLTHROUGH */
 500         case SIOCSIFADDR:
 501         case SIOCSIFNETMASK:
 502         case SIOCSIFDSTADDR:
 503                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 504                         return error;
 505
 506                 if (ifp == NULL)
 507                         return (EADDRNOTAVAIL);
 508
 509                 if (cmd == SIOCSIFDSTADDR &&
 510                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
 511                         return (EINVAL);
 512
 513                 if (ia == NULL) {
 514                         struct ifaddr *ifa;
 515                         int i;
 516
 517                         ia = ifa_create(sizeof(*ia), M_WAITOK);
 518                         ifa = &ia->ia_ifa;
 519
 520                         /*
 521                          * Setup per-CPU information
 522                          */
 523                         for (i = 0; i < ncpus; ++i) {
 524                                 ifac = &ifa->ifa_containers[i];
 525                                 iac = &ifac->ifa_proto_u.u_in_ifac;
 526                                 iac->ia = ia;
 527                                 iac->ia_ifac = ifac;
 528                         }
 529
 530                         /*
 531                          * Protect from NETISR_IP traversing address list
 532                          * while we're modifying it.
 533                          */
 534                         crit_enter();
 535
 536                         in_ialink(ia);
 537                         ifa_iflink(ifa, ifp, 1);
 538
 539                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 540                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 541                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 542                         ia->ia_sockmask.sin_len = 8;
 543                         ia->ia_sockmask.sin_family = AF_INET;
 544                         if (ifp->if_flags & IFF_BROADCAST) {
 545                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 546                                 ia->ia_broadaddr.sin_family = AF_INET;
 547                         }
 548                         ia->ia_ifp = ifp;
 549                         if (!(ifp->if_flags & IFF_LOOPBACK))
 550                                 in_interfaces++;
 551                         iaIsNew = 1;
 552
 553                         crit_exit();
 554                 }
 555                 break;
 556
 557         case SIOCSIFBRDADDR:
 558                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 559                         return error;
 560                 /* FALLTHROUGH */
 561
 562         case SIOCGIFADDR:
 563         case SIOCGIFNETMASK:
 564         case SIOCGIFDSTADDR:
 565         case SIOCGIFBRDADDR:
 566                 if (ia == NULL)
 567                         return (EADDRNOTAVAIL);
 568                 break;
 569         }
 570
 571         switch (cmd) {
 572         case SIOCGIFADDR:
 573                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 574                 return (0);
 575
 576         case SIOCGIFBRDADDR:
 577                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 578                         return (EINVAL);
 579                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 580                 return (0);
 581
 582         case SIOCGIFDSTADDR:
 583                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 584                         return (EINVAL);
 585                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 586                 return (0);
 587
 588         case SIOCGIFNETMASK:
 589                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 590                 return (0);
 591
 592         case SIOCSIFDSTADDR:
 593                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
 594
 595                 oldaddr = ia->ia_dstaddr;
 596                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 597                 if (ifp->if_ioctl != NULL) {
 598                         ifnet_serialize_all(ifp);
 599                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 600                                               td->td_proc->p_ucred);
 601                         ifnet_deserialize_all(ifp);
 602                         if (error) {
 603                                 ia->ia_dstaddr = oldaddr;
 604                                 return (error);
 605                         }
 606                 }
 607                 if (ia->ia_flags & IFA_ROUTE) {
 608                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 609                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 610                         ia->ia_ifa.ifa_dstaddr =
 611                                         (struct sockaddr *)&ia->ia_dstaddr;
 612                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 613                 }
 614                 return (0);
 615
 616         case SIOCSIFBRDADDR:
 617                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 618                         return (EINVAL);
 619                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 620                 return (0);
 621
 622         case SIOCSIFADDR:
 623                 error = in_ifinit(ifp, ia,
 624                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
 625                 if (error != 0 && iaIsNew)
 626                         break;
 627                 if (error == 0) {
 628                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 629                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 630                         &ia->ia_ifa);
 631                 }
 632                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 633                         /*
 634                          * Interface is brought up by in_ifinit()
 635                          * (via ifp->if_ioctl).  We act as if the
 636                          * interface got IFF_UP flag turned on.
 637                          */
 638                         if_up(ifp);
 639                 }
 640                 return (0);
 641
 642         case SIOCSIFNETMASK:
 643                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 644                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 645                 return (0);
 646
 647         case SIOCAIFADDR:
 648                 maskIsNew = 0;
 649                 hostIsNew = 1;
 650                 error = 0;
 651                 if (ia->ia_addr.sin_family == AF_INET) {
 652                         if (ifra->ifra_addr.sin_len == 0) {
 653                                 ifra->ifra_addr = ia->ia_addr;
 654                                 hostIsNew = 0;
 655                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 656                                    ia->ia_addr.sin_addr.s_addr) {
 657                                 hostIsNew = 0;
 658                         }
 659                 }
 660                 if (ifra->ifra_mask.sin_len) {
 661                         in_ifscrub(ifp, ia);
 662                         ia->ia_sockmask = ifra->ifra_mask;
 663                         ia->ia_sockmask.sin_family = AF_INET;
 664                         ia->ia_subnetmask =
 665                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
 666                         maskIsNew = 1;
 667                 }
 668                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 669                     ifra->ifra_dstaddr.sin_family == AF_INET) {
 670                         in_ifscrub(ifp, ia);
 671                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 672                         maskIsNew  = 1; /* We lie; but the effect's the same */
 673                 }
 674                 if (ifra->ifra_addr.sin_family == AF_INET &&
 675                     (hostIsNew || maskIsNew))
 676                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 677
 678                 if (error != 0 && iaIsNew)
 679                         break;
 680
 681                 if ((ifp->if_flags & IFF_BROADCAST) &&
 682                     ifra->ifra_broadaddr.sin_family == AF_INET)
 683                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 684                 if (error == 0) {
 685                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 686                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 687                         &ia->ia_ifa);
 688                 }
 689                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 690                         /* See the comment in SIOCSIFADDR */
 691                         if_up(ifp);
 692                 }
 693                 return (error);
 694
 695         case SIOCDIFADDR:
 696                 /*
 697                  * in_ifscrub kills the interface route.
 698                  */
 699                 in_ifscrub(ifp, ia);
 700                 /*
 701                  * in_ifadown gets rid of all the rest of
 702                  * the routes.  This is not quite the right
 703                  * thing to do, but at least if we are running
 704                  * a routing process they will come back.
 705                  */
 706                 in_ifadown(&ia->ia_ifa, 1);
 707                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
 708                                     &ia->ia_ifa);
 709                 error = 0;
 710                 break;
 711
 712         default:
 713                 if (ifp == NULL || ifp->if_ioctl == NULL)
 714                         return (EOPNOTSUPP);
 715                 ifnet_serialize_all(ifp);
 716                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 717                 ifnet_deserialize_all(ifp);
 718                 return (error);
 719         }
 720
 721         KKASSERT(cmd == SIOCDIFADDR ||
 722                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
 723
 724         ifa_ifunlink(&ia->ia_ifa, ifp);
 725         in_iaunlink(ia);
 726
 727         if (cmd == SIOCDIFADDR) {
 728                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 729                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
 730                         in_iahash_remove(ia);
 731         }
 732 #ifdef INVARIANTS
 733         else {
 734                 /*
 735                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
 736                  * already taken care of the deletion from hash table
 737                  */
 738                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 739                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 740                         ("SIOC%cIFADDR failed on new ia, "
 741                          "but the new ia is still in hash table",
 742                          cmd == SIOCSIFADDR ? 'S' : 'A'));
 743         }
 744 #endif
 745
 746         ifa_destroy(&ia->ia_ifa);
 747
 748         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
 749             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
 750                 /*
 751                  * Though the address assignment failed, the
 752                  * interface is brought up by in_ifinit()
 753                  * (via ifp->if_ioctl).  With the hope that
 754                  * the interface has some valid addresses, we
 755                  * act as if IFF_UP flag was just set on the
 756                  * interface.
 757                  *
 758                  * NOTE:
 759                  * This could only be done after the failed
 760                  * address is unlinked from the global address
 761                  * list.
 762                  */
 763                 if_up(ifp);
 764         }
 765
 766         return (error);
 767 }
 768
 769 /*
 770  * SIOC[GAD]LIFADDR.
 771  *      SIOCGLIFADDR: get first address. (?!?)
 772  *      SIOCGLIFADDR with IFLR_PREFIX:
 773  *              get first address that matches the specified prefix.
 774  *      SIOCALIFADDR: add the specified address.
 775  *      SIOCALIFADDR with IFLR_PREFIX:
 776  *              EINVAL since we can't deduce hostid part of the address.
 777  *      SIOCDLIFADDR: delete the specified address.
 778  *      SIOCDLIFADDR with IFLR_PREFIX:
 779  *              delete the first address that matches the specified prefix.
 780  * return values:
 781  *      EINVAL on invalid parameters
 782  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 783  *      other values may be returned from in_ioctl()
 784  *
 785  * NOTE! td might be NULL.
 786  */
 787 static int
 788 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 789                  struct thread *td)
 790 {
 791         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 792
 793         /* sanity checks */
 794         if (!data || !ifp) {
 795                 panic("invalid argument to in_lifaddr_ioctl");
 796                 /*NOTRECHED*/
 797         }
 798
 799         switch (cmd) {
 800         case SIOCGLIFADDR:
 801                 /* address must be specified on GET with IFLR_PREFIX */
 802                 if ((iflr->flags & IFLR_PREFIX) == 0)
 803                         break;
 804                 /*FALLTHROUGH*/
 805         case SIOCALIFADDR:
 806         case SIOCDLIFADDR:
 807                 /* address must be specified on ADD and DELETE */
 808                 if (iflr->addr.ss_family != AF_INET)
 809                         return EINVAL;
 810                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 811                         return EINVAL;
 812                 /* XXX need improvement */
 813                 if (iflr->dstaddr.ss_family
 814                  && iflr->dstaddr.ss_family != AF_INET)
 815                         return EINVAL;
 816                 if (iflr->dstaddr.ss_family
 817                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 818                         return EINVAL;
 819                 break;
 820         default: /*shouldn't happen*/
 821                 return EOPNOTSUPP;
 822         }
 823         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 824                 return EINVAL;
 825
 826         switch (cmd) {
 827         case SIOCALIFADDR:
 828             {
 829                 struct in_aliasreq ifra;
 830
 831                 if (iflr->flags & IFLR_PREFIX)
 832                         return EINVAL;
 833
 834                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 835                 bzero(&ifra, sizeof ifra);
 836                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
 837
 838                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 839
 840                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 841                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 842                                 iflr->dstaddr.ss_len);
 843                 }
 844
 845                 ifra.ifra_mask.sin_family = AF_INET;
 846                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 847                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 848
 849                 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
 850             }
 851         case SIOCGLIFADDR:
 852         case SIOCDLIFADDR:
 853             {
 854                 struct ifaddr_container *ifac;
 855                 struct in_ifaddr *ia;
 856                 struct in_addr mask, candidate, match;
 857                 struct sockaddr_in *sin;
 858                 int cmp;
 859
 860                 bzero(&mask, sizeof mask);
 861                 if (iflr->flags & IFLR_PREFIX) {
 862                         /* lookup a prefix rather than address. */
 863                         in_len2mask(&mask, iflr->prefixlen);
 864
 865                         sin = (struct sockaddr_in *)&iflr->addr;
 866                         match.s_addr = sin->sin_addr.s_addr;
 867                         match.s_addr &= mask.s_addr;
 868
 869                         /* if you set extra bits, that's wrong */
 870                         if (match.s_addr != sin->sin_addr.s_addr)
 871                                 return EINVAL;
 872
 873                         cmp = 1;
 874                 } else {
 875                         if (cmd == SIOCGLIFADDR) {
 876                                 /* on getting an address, take the 1st match */
 877                                 match.s_addr = 0; /* gcc4 warning */
 878                                 cmp = 0;        /*XXX*/
 879                         } else {
 880                                 /* on deleting an address, do exact match */
 881                                 in_len2mask(&mask, 32);
 882                                 sin = (struct sockaddr_in *)&iflr->addr;
 883                                 match.s_addr = sin->sin_addr.s_addr;
 884
 885                                 cmp = 1;
 886                         }
 887                 }
 888
 889                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 890                         struct ifaddr *ifa = ifac->ifa;
 891
 892                         if (ifa->ifa_addr->sa_family != AF_INET6)
 893                                 continue;
 894                         if (!cmp)
 895                                 break;
 896                         candidate.s_addr =
 897                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 898                         candidate.s_addr &= mask.s_addr;
 899                         if (candidate.s_addr == match.s_addr)
 900                                 break;
 901                 }
 902                 if (ifac == NULL)
 903                         return EADDRNOTAVAIL;
 904                 ia = (struct in_ifaddr *)(ifac->ifa);
 905
 906                 if (cmd == SIOCGLIFADDR) {
 907                         /* fill in the if_laddrreq structure */
 908                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 909
 910                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 911                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 912                                         ia->ia_dstaddr.sin_len);
 913                         } else
 914                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 915
 916                         iflr->prefixlen =
 917                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 918
 919                         iflr->flags = 0;        /*XXX*/
 920
 921                         return 0;
 922                 } else {
 923                         struct in_aliasreq ifra;
 924
 925                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 926                         bzero(&ifra, sizeof ifra);
 927                         bcopy(iflr->iflr_name, ifra.ifra_name,
 928                                 sizeof ifra.ifra_name);
 929
 930                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 931                                 ia->ia_addr.sin_len);
 932                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 933                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 934                                         ia->ia_dstaddr.sin_len);
 935                         }
 936                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 937                                 ia->ia_sockmask.sin_len);
 938
 939                         return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
 940                                           ifp, td);
 941                 }
 942             }
 943         }
 944
 945         return EOPNOTSUPP;      /*just for safety*/
 946 }
 947
 948 /*
 949  * Delete any existing route for an interface.
 950  */
 951 void
 952 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
 953 {
 954         in_scrubprefix(ia);
 955 }
 956
 957 /*
 958  * Initialize an interface's internet address
 959  * and routing table entry.
 960  */
 961 static int
 962 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
 963           const struct sockaddr_in *sin, int scrub)
 964 {
 965         u_long i = ntohl(sin->sin_addr.s_addr);
 966         struct sockaddr_in oldaddr;
 967         struct ifaddr_container *ifac;
 968         int flags = RTF_UP, error = 0;
 969         int was_hash = 0;
 970
 971         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 972         oldaddr = ia->ia_addr;
 973
 974         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
 975                 was_hash = 1;
 976                 in_iahash_remove(ia);
 977         }
 978
 979         ia->ia_addr = *sin;
 980         if (ia->ia_addr.sin_family == AF_INET)
 981                 in_iahash_insert(ia);
 982
 983         /*
 984          * Give the interface a chance to initialize
 985          * if this is its first address,
 986          * and to validate the address if necessary.
 987          */
 988         if (ifp->if_ioctl != NULL) {
 989                 ifnet_serialize_all(ifp);
 990                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
 991                 ifnet_deserialize_all(ifp);
 992                 if (error)
 993                         goto fail;
 994         }
 995
 996         /*
 997          * Delete old route, if requested.
 998          */
 999         if (scrub) {
1000                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1001                 in_ifscrub(ifp, ia);
1002                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1003         }
1004
1005         /*
1006          * Calculate netmask/subnetmask.
1007          */
1008         if (IN_CLASSA(i))
1009                 ia->ia_netmask = IN_CLASSA_NET;
1010         else if (IN_CLASSB(i))
1011                 ia->ia_netmask = IN_CLASSB_NET;
1012         else
1013                 ia->ia_netmask = IN_CLASSC_NET;
1014         /*
1015          * The subnet mask usually includes at least the standard network part,
1016          * but may may be smaller in the case of supernetting.
1017          * If it is set, we believe it.
1018          */
1019         if (ia->ia_subnetmask == 0) {
1020                 ia->ia_subnetmask = ia->ia_netmask;
1021                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1022         } else {
1023                 ia->ia_netmask &= ia->ia_subnetmask;
1024         }
1025         ia->ia_net = i & ia->ia_netmask;
1026         ia->ia_subnet = i & ia->ia_subnetmask;
1027         in_socktrim(&ia->ia_sockmask);
1028
1029         /*
1030          * Add route for the network.
1031          */
1032         ia->ia_ifa.ifa_metric = ifp->if_metric;
1033         if (ifp->if_flags & IFF_BROADCAST) {
1034                 ia->ia_broadaddr.sin_addr.s_addr =
1035                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1036                 ia->ia_netbroadcast.s_addr =
1037                         htonl(ia->ia_net | ~ ia->ia_netmask);
1038         } else if (ifp->if_flags & IFF_LOOPBACK) {
1039                 ia->ia_dstaddr = ia->ia_addr;
1040                 flags |= RTF_HOST;
1041         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1042                 if (ia->ia_dstaddr.sin_family != AF_INET)
1043                         return (0);
1044                 flags |= RTF_HOST;
1045         }
1046
1047         /*-
1048          * Don't add host routes for interface addresses of
1049          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1050          * possible to assign several such address pairs with consistent
1051          * results (no host route) and is required by BOOTP.
1052          *
1053          * XXX: This is ugly !  There should be a way for the caller to
1054          *      say that they don't want a host route.
1055          */
1056         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1057             ia->ia_netmask != IN_CLASSA_NET ||
1058             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1059                 error = in_addprefix(ia, flags);
1060                 if (error)
1061                         goto fail;
1062         }
1063
1064         /*
1065          * If the interface supports multicast, join the "all hosts"
1066          * multicast group on that interface.
1067          */
1068         if (ifp->if_flags & IFF_MULTICAST) {
1069                 struct in_addr addr;
1070
1071                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1072                 in_addmulti(&addr, ifp);
1073         }
1074         return (0);
1075 fail:
1076         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1077                 in_iahash_remove(ia);
1078
1079         ia->ia_addr = oldaddr;
1080         if (was_hash)
1081                 in_iahash_insert(ia);
1082         return (error);
1083 }
1084
1085 #define rtinitflags(x) \
1086         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
1087          ? RTF_HOST : 0)
1088
1089 /*
1090  * Add a route to prefix ("connected route" in cisco terminology).
1091  * Do nothing, if there are some interface addresses with the same
1092  * prefix already.  This function assumes that the 'target' parent
1093  * interface is UP.
1094  */
1095 static int
1096 in_addprefix(struct in_ifaddr *target, int flags)
1097 {
1098         struct in_ifaddr_container *iac;
1099         struct in_addr prefix, mask;
1100         int error;
1101
1102 #ifdef CARP
1103         /*
1104          * Don't add prefix routes for CARP interfaces.
1105          * Prefix routes creation is handled by CARP
1106          * interfaces themselves.
1107          */
1108         if (target->ia_ifp->if_type == IFT_CARP)
1109                 return 0;
1110 #endif
1111
1112         mask = target->ia_sockmask.sin_addr;
1113         if (flags & RTF_HOST) {
1114                 prefix = target->ia_dstaddr.sin_addr;
1115         } else {
1116                 prefix = target->ia_addr.sin_addr;
1117                 prefix.s_addr &= mask.s_addr;
1118         }
1119
1120         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1121                 struct in_ifaddr *ia = iac->ia;
1122                 struct in_addr p;
1123
1124                 /* Don't test against self */
1125                 if (ia == target)
1126                         continue;
1127
1128                 /* The tested address does not own a route entry */
1129                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1130                         continue;
1131
1132                 /* Prefix test */
1133                 if (rtinitflags(ia)) {
1134                         p = ia->ia_dstaddr.sin_addr;
1135                 } else {
1136                         p = ia->ia_addr.sin_addr;
1137                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1138                 }
1139                 if (prefix.s_addr != p.s_addr)
1140                         continue;
1141
1142                 /*
1143                  * If the to-be-added address and the curretly being
1144                  * tested address are not host addresses, we need to
1145                  * take subnetmask into consideration.
1146                  */
1147                 if (!(flags & RTF_HOST) && !rtinitflags(ia) &&
1148                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1149                         continue;
1150
1151                 /*
1152                  * If we got a matching prefix route inserted by other
1153                  * interface address, we don't need to bother.
1154                  */
1155                 return 0;
1156         }
1157
1158         /*
1159          * No one seem to have prefix route; insert it.
1160          */
1161         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1162         if (!error)
1163                 target->ia_flags |= IFA_ROUTE;
1164         return error;
1165 }
1166
1167 /*
1168  * Remove a route to prefix ("connected route" in cisco terminology).
1169  * Re-installs the route by using another interface address, if there's
1170  * one with the same prefix (otherwise we lose the route mistakenly).
1171  */
1172 static void
1173 in_scrubprefix(struct in_ifaddr *target)
1174 {
1175         struct in_ifaddr_container *iac;
1176         struct in_addr prefix, mask;
1177         int error;
1178
1179 #ifdef CARP
1180         /*
1181          * Don't scrub prefix routes for CARP interfaces.
1182          * Prefix routes deletion is handled by CARP
1183          * interfaces themselves.
1184          */
1185         if (target->ia_ifp->if_type == IFT_CARP)
1186                 return;
1187 #endif
1188
1189         if ((target->ia_flags & IFA_ROUTE) == 0)
1190                 return;
1191
1192         mask = target->ia_sockmask.sin_addr;
1193         if (rtinitflags(target)) {
1194                 prefix = target->ia_dstaddr.sin_addr;
1195         } else {
1196                 prefix = target->ia_addr.sin_addr;
1197                 prefix.s_addr &= mask.s_addr;
1198         }
1199
1200         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1201                 struct in_ifaddr *ia = iac->ia;
1202                 struct in_addr p;
1203
1204                 /* Don't test against self */
1205                 if (ia == target)
1206                         continue;
1207
1208                 /* The tested address already owns a route entry */
1209                 if (ia->ia_flags & IFA_ROUTE)
1210                         continue;
1211
1212                 /*
1213                  * The prefix route of the tested address should
1214                  * never be installed if its parent interface is
1215                  * not UP yet.
1216                  */
1217                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1218                         continue;
1219
1220 #ifdef CARP
1221                 /*
1222                  * Don't add prefix routes for CARP interfaces.
1223                  * Prefix routes creation is handled by CARP
1224                  * interfaces themselves.
1225                  */
1226                 if (ia->ia_ifp->if_type == IFT_CARP)
1227                         continue;
1228 #endif
1229
1230                 /* Prefix test */
1231                 if (rtinitflags(ia)) {
1232                         p = ia->ia_dstaddr.sin_addr;
1233                 } else {
1234                         p = ia->ia_addr.sin_addr;
1235                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1236                 }
1237                 if (prefix.s_addr != p.s_addr)
1238                         continue;
1239
1240                 /*
1241                  * We don't need to test subnetmask here, as what we do
1242                  * in in_addprefix(), since if the the tested address's
1243                  * parent interface is UP, the tested address should own
1244                  * a prefix route entry and we would never reach here.
1245                  */
1246
1247                 /*
1248                  * If we got a matching prefix route, move IFA_ROUTE to him
1249                  */
1250                 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1251                 target->ia_flags &= ~IFA_ROUTE;
1252
1253                 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1254                 if (!error)
1255                         ia->ia_flags |= IFA_ROUTE;
1256                 return;
1257         }
1258
1259         /*
1260          * No candidates for this prefix route; just remove it.
1261          */
1262         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1263         target->ia_flags &= ~IFA_ROUTE;
1264 }
1265
1266 #undef rtinitflags
1267
1268 /*
1269  * Return 1 if the address might be a local broadcast address.
1270  */
1271 int
1272 in_broadcast(struct in_addr in, struct ifnet *ifp)
1273 {
1274         struct ifaddr_container *ifac;
1275         u_long t;
1276
1277         if (in.s_addr == INADDR_BROADCAST ||
1278             in.s_addr == INADDR_ANY)
1279                 return 1;
1280         if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0)
1281                 return 0;
1282         t = ntohl(in.s_addr);
1283         /*
1284          * Look through the list of addresses for a match
1285          * with a broadcast address.
1286          */
1287 #define ia ((struct in_ifaddr *)ifa)
1288         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1289                 struct ifaddr *ifa = ifac->ifa;
1290
1291                 if (ifa->ifa_addr->sa_family == AF_INET &&
1292                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1293                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1294                      /*
1295                       * Check for old-style (host 0) broadcast.
1296                       */
1297                      t == ia->ia_subnet || t == ia->ia_net) &&
1298                      /*
1299                       * Check for an all one subnetmask. These
1300                       * only exist when an interface gets a secondary
1301                       * address.
1302                       */
1303                      ia->ia_subnetmask != (u_long)0xffffffff)
1304                             return 1;
1305         }
1306         return (0);
1307 #undef ia
1308 }
1309
1310 /*
1311  * Add an address to the list of IP multicast addresses for a given interface.
1312  */
1313 struct in_multi *
1314 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1315 {
1316         struct in_multi *inm;
1317         int error;
1318         struct sockaddr_in sin;
1319         struct ifmultiaddr *ifma;
1320
1321         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1322             ("in_addmulti is not called in netisr0"));
1323
1324         /*
1325          * Call generic routine to add membership or increment
1326          * refcount.  It wants addresses in the form of a sockaddr,
1327          * so we build one here (being careful to zero the unused bytes).
1328          */
1329         bzero(&sin, sizeof sin);
1330         sin.sin_family = AF_INET;
1331         sin.sin_len = sizeof sin;
1332         sin.sin_addr = *ap;
1333         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1334         if (error)
1335                 return NULL;
1336
1337         /*
1338          * If ifma->ifma_protospec is null, then if_addmulti() created
1339          * a new record.  Otherwise, we are done.
1340          */
1341         if (ifma->ifma_protospec != NULL)
1342                 return ifma->ifma_protospec;
1343
1344         inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
1345         inm->inm_addr = *ap;
1346         inm->inm_ifp = ifp;
1347         inm->inm_ifma = ifma;
1348         ifma->ifma_protospec = inm;
1349         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1350
1351         /*
1352          * Let IGMP know that we have joined a new IP multicast group.
1353          */
1354         igmp_joingroup(inm);
1355         return inm;
1356 }
1357
1358 /*
1359  * Delete a multicast address record.
1360  */
1361 void
1362 in_delmulti(struct in_multi *inm)
1363 {
1364         struct ifmultiaddr *ifma;
1365         struct in_multi my_inm;
1366
1367         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1368             ("in_delmulti is not called in netisr0"));
1369
1370         ifma = inm->inm_ifma;
1371         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1372         if (ifma->ifma_refcount == 1) {
1373                 /*
1374                  * No remaining claims to this record; let IGMP know that
1375                  * we are leaving the multicast group.
1376                  * But do it after the if_delmulti() which might reset
1377                  * the interface and nuke the packet.
1378                  */
1379                 my_inm = *inm ;
1380                 ifma->ifma_protospec = NULL;
1381                 LIST_REMOVE(inm, inm_link);
1382                 kfree(inm, M_IPMADDR);
1383         }
1384         /* XXX - should be separate API for when we have an ifma? */
1385         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1386         if (my_inm.inm_ifp != NULL)
1387                 igmp_leavegroup(&my_inm);
1388 }
1389
1390 static void
1391 in_ifdetach_dispatch(netmsg_t nmsg)
1392 {
1393         struct lwkt_msg *lmsg = &nmsg->lmsg;
1394         struct ifnet *ifp = lmsg->u.ms_resultp;
1395         int cpu;
1396
1397         in_pcbpurgeif0(&ripcbinfo, ifp);
1398         for (cpu = 0; cpu < ncpus2; ++cpu)
1399                 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1400
1401         lwkt_replymsg(lmsg, 0);
1402 }
1403
1404 void
1405 in_ifdetach(struct ifnet *ifp)
1406 {
1407         struct netmsg_base nmsg;
1408         struct lwkt_msg *lmsg = &nmsg.lmsg;
1409
1410         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1411             in_ifdetach_dispatch);
1412         lmsg->u.ms_resultp = ifp;
1413
1414         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1415 }