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 /* ARGSUSED */
 223 int
 224 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 225     struct thread *td)
 226 {
 227         struct netmsg_pru_control msg;
 228         int error;
 229
 230         switch (cmd) {
 231         case SIOCALIFADDR:
 232         case SIOCDLIFADDR:
 233                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 234                         return error;
 235                 /* FALLTHROUGH */
 236         case SIOCGLIFADDR:
 237                 if (!ifp)
 238                         return EINVAL;
 239                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 240         }
 241
 242         /*
 243          * IFADDR alterations are serialized by netisr0
 244          */
 245         switch (cmd) {
 246         case SIOCSIFDSTADDR:
 247         case SIOCSIFBRDADDR:
 248         case SIOCSIFADDR:
 249         case SIOCSIFNETMASK:
 250         case SIOCAIFADDR:
 251         case SIOCDIFADDR:
 252                 netmsg_init(&msg.base, NULL, &curthread->td_msgport,
 253                             0, in_control_internal_dispatch);
 254                 msg.nm_cmd = cmd;
 255                 msg.nm_data = data;
 256                 msg.nm_ifp = ifp;
 257                 msg.nm_td = td;
 258                 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
 259                 error = msg.base.lmsg.ms_error;
 260                 break;
 261
 262         default:
 263                 error = in_control_internal(cmd, data, ifp, td);
 264                 break;
 265         }
 266         return error;
 267 }
 268
 269 static void
 270 in_ialink_dispatch(netmsg_t msg)
 271 {
 272         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 273         struct ifaddr_container *ifac;
 274         struct in_ifaddr_container *iac;
 275         int cpu = mycpuid;
 276
 277         crit_enter();
 278
 279         ifac = &ia->ia_ifa.ifa_containers[cpu];
 280         ASSERT_IFAC_VALID(ifac);
 281         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
 282                 ("ia is on in_ifaddrheads"));
 283
 284         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
 285         iac = &ifac->ifa_proto_u.u_in_ifac;
 286         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
 287
 288         crit_exit();
 289
 290         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 291 }
 292
 293 static void
 294 in_iaunlink_dispatch(netmsg_t msg)
 295 {
 296         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 297         struct ifaddr_container *ifac;
 298         struct in_ifaddr_container *iac;
 299         int cpu = mycpuid;
 300
 301         crit_enter();
 302
 303         ifac = &ia->ia_ifa.ifa_containers[cpu];
 304         ASSERT_IFAC_VALID(ifac);
 305         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 306                 ("ia is not on in_ifaddrheads"));
 307
 308         iac = &ifac->ifa_proto_u.u_in_ifac;
 309         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
 310         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
 311
 312         crit_exit();
 313
 314         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 315 }
 316
 317 static void
 318 in_iahashins_dispatch(netmsg_t msg)
 319 {
 320         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 321         struct ifaddr_container *ifac;
 322         struct in_ifaddr_container *iac;
 323         int cpu = mycpuid;
 324
 325         crit_enter();
 326
 327         ifac = &ia->ia_ifa.ifa_containers[cpu];
 328         ASSERT_IFAC_VALID(ifac);
 329         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 330                 ("ia is on in_ifaddrhashtbls"));
 331
 332         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
 333         iac = &ifac->ifa_proto_u.u_in_ifac;
 334         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 335                          iac, ia_hash);
 336
 337         crit_exit();
 338
 339         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 340 }
 341
 342 static void
 343 in_iahashrem_dispatch(netmsg_t msg)
 344 {
 345         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 346         struct ifaddr_container *ifac;
 347         struct in_ifaddr_container *iac;
 348         int cpu = mycpuid;
 349
 350         crit_enter();
 351
 352         ifac = &ia->ia_ifa.ifa_containers[cpu];
 353         ASSERT_IFAC_VALID(ifac);
 354         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
 355                 ("ia is not on in_ifaddrhashtbls"));
 356
 357         iac = &ifac->ifa_proto_u.u_in_ifac;
 358         LIST_REMOVE(iac, ia_hash);
 359         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
 360
 361         crit_exit();
 362
 363         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 364 }
 365
 366 static void
 367 in_ialink(struct in_ifaddr *ia)
 368 {
 369         struct netmsg_base msg;
 370
 371         netmsg_init(&msg, NULL, &curthread->td_msgport,
 372                     0, in_ialink_dispatch);
 373         msg.lmsg.u.ms_resultp = ia;
 374
 375         ifa_domsg(&msg.lmsg, 0);
 376 }
 377
 378 void
 379 in_iaunlink(struct in_ifaddr *ia)
 380 {
 381         struct netmsg_base msg;
 382
 383         netmsg_init(&msg, NULL, &curthread->td_msgport,
 384                     0, in_iaunlink_dispatch);
 385         msg.lmsg.u.ms_resultp = ia;
 386
 387         ifa_domsg(&msg.lmsg, 0);
 388 }
 389
 390 void
 391 in_iahash_insert(struct in_ifaddr *ia)
 392 {
 393         struct netmsg_base msg;
 394
 395         netmsg_init(&msg, NULL, &curthread->td_msgport,
 396                     0, in_iahashins_dispatch);
 397         msg.lmsg.u.ms_resultp = ia;
 398
 399         ifa_domsg(&msg.lmsg, 0);
 400 }
 401
 402 void
 403 in_iahash_remove(struct in_ifaddr *ia)
 404 {
 405         struct netmsg_base msg;
 406
 407         netmsg_init(&msg, NULL, &curthread->td_msgport,
 408                     0, in_iahashrem_dispatch);
 409         msg.lmsg.u.ms_resultp = ia;
 410
 411         ifa_domsg(&msg.lmsg, 0);
 412 }
 413
 414 static __inline struct in_ifaddr *
 415 in_ianext(struct in_ifaddr *oia)
 416 {
 417         struct ifaddr_container *ifac;
 418         struct in_ifaddr_container *iac;
 419
 420         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
 421         ASSERT_IFAC_VALID(ifac);
 422         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 423                 ("ia is not on in_ifaddrheads"));
 424
 425         iac = &ifac->ifa_proto_u.u_in_ifac;
 426         iac = TAILQ_NEXT(iac, ia_link);
 427         if (iac != NULL)
 428                 return iac->ia;
 429         else
 430                 return NULL;
 431 }
 432
 433 static int
 434 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
 435                     struct thread *td)
 436 {
 437         struct ifreq *ifr = (struct ifreq *)data;
 438         struct in_ifaddr *ia = NULL;
 439         struct in_addr dst;
 440         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 441         struct ifaddr_container *ifac;
 442         struct in_ifaddr_container *iac;
 443         struct sockaddr_in oldaddr;
 444         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
 445         int error = 0;
 446
 447         iaIsNew = 0;
 448         ifpWasUp = 0;
 449
 450         /*
 451          * Find address for this interface, if it exists.
 452          *
 453          * If an alias address was specified, find that one instead of
 454          * the first one on the interface, if possible
 455          */
 456         if (ifp) {
 457                 struct in_ifaddr *iap;
 458
 459                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 460                 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
 461                         iap = iac->ia;
 462                         if (iap->ia_ifp == ifp &&
 463                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 464                                 ia = iap;
 465                                 break;
 466                         }
 467                 }
 468                 if (ia == NULL) {
 469                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
 470                                       ifa_link) {
 471                                 iap = ifatoia(ifac->ifa);
 472                                 if (iap->ia_addr.sin_family == AF_INET) {
 473                                         ia = iap;
 474                                         break;
 475                                 }
 476                         }
 477                 }
 478
 479                 if (ifp->if_flags & IFF_UP)
 480                         ifpWasUp = 1;
 481         }
 482
 483         switch (cmd) {
 484         case SIOCAIFADDR:
 485         case SIOCDIFADDR:
 486                 if (ifp == NULL)
 487                         return (EADDRNOTAVAIL);
 488                 if (ifra->ifra_addr.sin_family == AF_INET) {
 489                         while (ia != NULL) {
 490                                 if (ia->ia_ifp == ifp  &&
 491                                     ia->ia_addr.sin_addr.s_addr ==
 492                                     ifra->ifra_addr.sin_addr.s_addr)
 493                                         break;
 494                                 ia = in_ianext(ia);
 495                         }
 496                         if ((ifp->if_flags & IFF_POINTOPOINT) &&
 497                             cmd == SIOCAIFADDR &&
 498                             ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
 499                                 return EDESTADDRREQ;
 500                         }
 501                 }
 502                 if (cmd == SIOCDIFADDR && ia == NULL)
 503                         return (EADDRNOTAVAIL);
 504                 /* FALLTHROUGH */
 505         case SIOCSIFADDR:
 506         case SIOCSIFNETMASK:
 507         case SIOCSIFDSTADDR:
 508                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 509                         return error;
 510
 511                 if (ifp == NULL)
 512                         return (EADDRNOTAVAIL);
 513
 514                 if (cmd == SIOCSIFDSTADDR &&
 515                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
 516                         return (EINVAL);
 517
 518                 if (ia == NULL) {
 519                         struct ifaddr *ifa;
 520                         int i;
 521
 522                         ia = ifa_create(sizeof(*ia), M_WAITOK);
 523                         ifa = &ia->ia_ifa;
 524
 525                         /*
 526                          * Setup per-CPU information
 527                          */
 528                         for (i = 0; i < ncpus; ++i) {
 529                                 ifac = &ifa->ifa_containers[i];
 530                                 iac = &ifac->ifa_proto_u.u_in_ifac;
 531                                 iac->ia = ia;
 532                                 iac->ia_ifac = ifac;
 533                         }
 534
 535                         /*
 536                          * Protect from NETISR_IP traversing address list
 537                          * while we're modifying it.
 538                          */
 539                         crit_enter();
 540
 541                         in_ialink(ia);
 542                         ifa_iflink(ifa, ifp, 1);
 543
 544                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 545                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 546                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 547                         ia->ia_sockmask.sin_len = 8;
 548                         ia->ia_sockmask.sin_family = AF_INET;
 549                         if (ifp->if_flags & IFF_BROADCAST) {
 550                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 551                                 ia->ia_broadaddr.sin_family = AF_INET;
 552                         }
 553                         ia->ia_ifp = ifp;
 554                         if (!(ifp->if_flags & IFF_LOOPBACK))
 555                                 in_interfaces++;
 556                         iaIsNew = 1;
 557
 558                         crit_exit();
 559                 }
 560                 break;
 561
 562         case SIOCSIFBRDADDR:
 563                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 564                         return error;
 565                 /* FALLTHROUGH */
 566
 567         case SIOCGIFADDR:
 568         case SIOCGIFNETMASK:
 569         case SIOCGIFDSTADDR:
 570         case SIOCGIFBRDADDR:
 571                 if (ia == NULL)
 572                         return (EADDRNOTAVAIL);
 573                 break;
 574         }
 575
 576         switch (cmd) {
 577         case SIOCGIFADDR:
 578                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 579                 return (0);
 580
 581         case SIOCGIFBRDADDR:
 582                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 583                         return (EINVAL);
 584                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 585                 return (0);
 586
 587         case SIOCGIFDSTADDR:
 588                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 589                         return (EINVAL);
 590                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 591                 return (0);
 592
 593         case SIOCGIFNETMASK:
 594                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 595                 return (0);
 596
 597         case SIOCSIFDSTADDR:
 598                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
 599
 600                 oldaddr = ia->ia_dstaddr;
 601                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 602                 if (ifp->if_ioctl != NULL) {
 603                         ifnet_serialize_all(ifp);
 604                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 605                                               td->td_proc->p_ucred);
 606                         ifnet_deserialize_all(ifp);
 607                         if (error) {
 608                                 ia->ia_dstaddr = oldaddr;
 609                                 return (error);
 610                         }
 611                 }
 612                 if (ia->ia_flags & IFA_ROUTE) {
 613                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 614                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 615                         ia->ia_ifa.ifa_dstaddr =
 616                                         (struct sockaddr *)&ia->ia_dstaddr;
 617                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 618                 }
 619                 return (0);
 620
 621         case SIOCSIFBRDADDR:
 622                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 623                         return (EINVAL);
 624                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 625                 return (0);
 626
 627         case SIOCSIFADDR:
 628                 error = in_ifinit(ifp, ia,
 629                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
 630                 if (error != 0 && iaIsNew)
 631                         break;
 632                 if (error == 0) {
 633                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 634                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 635                         &ia->ia_ifa);
 636                 }
 637                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 638                         /*
 639                          * Interface is brought up by in_ifinit()
 640                          * (via ifp->if_ioctl).  We act as if the
 641                          * interface got IFF_UP flag turned on.
 642                          */
 643                         if_up(ifp);
 644                 }
 645                 return (0);
 646
 647         case SIOCSIFNETMASK:
 648                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 649                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 650                 return (0);
 651
 652         case SIOCAIFADDR:
 653                 maskIsNew = 0;
 654                 hostIsNew = 1;
 655                 error = 0;
 656                 if (ia->ia_addr.sin_family == AF_INET) {
 657                         if (ifra->ifra_addr.sin_len == 0) {
 658                                 ifra->ifra_addr = ia->ia_addr;
 659                                 hostIsNew = 0;
 660                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 661                                    ia->ia_addr.sin_addr.s_addr) {
 662                                 hostIsNew = 0;
 663                         }
 664                 }
 665                 if (ifra->ifra_mask.sin_len) {
 666                         in_ifscrub(ifp, ia);
 667                         ia->ia_sockmask = ifra->ifra_mask;
 668                         ia->ia_sockmask.sin_family = AF_INET;
 669                         ia->ia_subnetmask =
 670                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
 671                         maskIsNew = 1;
 672                 }
 673                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 674                     ifra->ifra_dstaddr.sin_family == AF_INET) {
 675                         in_ifscrub(ifp, ia);
 676                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 677                         maskIsNew  = 1; /* We lie; but the effect's the same */
 678                 }
 679                 if (ifra->ifra_addr.sin_family == AF_INET &&
 680                     (hostIsNew || maskIsNew))
 681                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 682
 683                 if (error != 0 && iaIsNew)
 684                         break;
 685
 686                 if ((ifp->if_flags & IFF_BROADCAST) &&
 687                     ifra->ifra_broadaddr.sin_family == AF_INET)
 688                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 689                 if (error == 0) {
 690                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 691                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 692                         &ia->ia_ifa);
 693                 }
 694                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 695                         /* See the comment in SIOCSIFADDR */
 696                         if_up(ifp);
 697                 }
 698                 return (error);
 699
 700         case SIOCDIFADDR:
 701                 /*
 702                  * in_ifscrub kills the interface route.
 703                  */
 704                 in_ifscrub(ifp, ia);
 705                 /*
 706                  * in_ifadown gets rid of all the rest of
 707                  * the routes.  This is not quite the right
 708                  * thing to do, but at least if we are running
 709                  * a routing process they will come back.
 710                  */
 711                 in_ifadown(&ia->ia_ifa, 1);
 712                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
 713                                     &ia->ia_ifa);
 714                 error = 0;
 715                 break;
 716
 717         default:
 718                 if (ifp == NULL || ifp->if_ioctl == NULL)
 719                         return (EOPNOTSUPP);
 720                 ifnet_serialize_all(ifp);
 721                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 722                 ifnet_deserialize_all(ifp);
 723                 return (error);
 724         }
 725
 726         KKASSERT(cmd == SIOCDIFADDR ||
 727                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
 728
 729         ifa_ifunlink(&ia->ia_ifa, ifp);
 730         in_iaunlink(ia);
 731
 732         if (cmd == SIOCDIFADDR) {
 733                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 734                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
 735                         in_iahash_remove(ia);
 736         }
 737 #ifdef INVARIANTS
 738         else {
 739                 /*
 740                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
 741                  * already taken care of the deletion from hash table
 742                  */
 743                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 744                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 745                         ("SIOC%cIFADDR failed on new ia, "
 746                          "but the new ia is still in hash table",
 747                          cmd == SIOCSIFADDR ? 'S' : 'A'));
 748         }
 749 #endif
 750
 751         ifa_destroy(&ia->ia_ifa);
 752
 753         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
 754             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
 755                 /*
 756                  * Though the address assignment failed, the
 757                  * interface is brought up by in_ifinit()
 758                  * (via ifp->if_ioctl).  With the hope that
 759                  * the interface has some valid addresses, we
 760                  * act as if IFF_UP flag was just set on the
 761                  * interface.
 762                  *
 763                  * NOTE:
 764                  * This could only be done after the failed
 765                  * address is unlinked from the global address
 766                  * list.
 767                  */
 768                 if_up(ifp);
 769         }
 770
 771         return (error);
 772 }
 773
 774 /*
 775  * SIOC[GAD]LIFADDR.
 776  *      SIOCGLIFADDR: get first address. (?!?)
 777  *      SIOCGLIFADDR with IFLR_PREFIX:
 778  *              get first address that matches the specified prefix.
 779  *      SIOCALIFADDR: add the specified address.
 780  *      SIOCALIFADDR with IFLR_PREFIX:
 781  *              EINVAL since we can't deduce hostid part of the address.
 782  *      SIOCDLIFADDR: delete the specified address.
 783  *      SIOCDLIFADDR with IFLR_PREFIX:
 784  *              delete the first address that matches the specified prefix.
 785  * return values:
 786  *      EINVAL on invalid parameters
 787  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 788  *      other values may be returned from in_ioctl()
 789  *
 790  * NOTE! td might be NULL.
 791  */
 792 static int
 793 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 794                  struct thread *td)
 795 {
 796         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 797
 798         /* sanity checks */
 799         if (!data || !ifp) {
 800                 panic("invalid argument to in_lifaddr_ioctl");
 801                 /*NOTRECHED*/
 802         }
 803
 804         switch (cmd) {
 805         case SIOCGLIFADDR:
 806                 /* address must be specified on GET with IFLR_PREFIX */
 807                 if ((iflr->flags & IFLR_PREFIX) == 0)
 808                         break;
 809                 /*FALLTHROUGH*/
 810         case SIOCALIFADDR:
 811         case SIOCDLIFADDR:
 812                 /* address must be specified on ADD and DELETE */
 813                 if (iflr->addr.ss_family != AF_INET)
 814                         return EINVAL;
 815                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 816                         return EINVAL;
 817                 /* XXX need improvement */
 818                 if (iflr->dstaddr.ss_family
 819                  && iflr->dstaddr.ss_family != AF_INET)
 820                         return EINVAL;
 821                 if (iflr->dstaddr.ss_family
 822                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 823                         return EINVAL;
 824                 break;
 825         default: /*shouldn't happen*/
 826                 return EOPNOTSUPP;
 827         }
 828         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 829                 return EINVAL;
 830
 831         switch (cmd) {
 832         case SIOCALIFADDR:
 833             {
 834                 struct in_aliasreq ifra;
 835
 836                 if (iflr->flags & IFLR_PREFIX)
 837                         return EINVAL;
 838
 839                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 840                 bzero(&ifra, sizeof ifra);
 841                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
 842
 843                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 844
 845                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 846                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 847                                 iflr->dstaddr.ss_len);
 848                 }
 849
 850                 ifra.ifra_mask.sin_family = AF_INET;
 851                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 852                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 853
 854                 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
 855             }
 856         case SIOCGLIFADDR:
 857         case SIOCDLIFADDR:
 858             {
 859                 struct ifaddr_container *ifac;
 860                 struct in_ifaddr *ia;
 861                 struct in_addr mask, candidate, match;
 862                 struct sockaddr_in *sin;
 863                 int cmp;
 864
 865                 bzero(&mask, sizeof mask);
 866                 if (iflr->flags & IFLR_PREFIX) {
 867                         /* lookup a prefix rather than address. */
 868                         in_len2mask(&mask, iflr->prefixlen);
 869
 870                         sin = (struct sockaddr_in *)&iflr->addr;
 871                         match.s_addr = sin->sin_addr.s_addr;
 872                         match.s_addr &= mask.s_addr;
 873
 874                         /* if you set extra bits, that's wrong */
 875                         if (match.s_addr != sin->sin_addr.s_addr)
 876                                 return EINVAL;
 877
 878                         cmp = 1;
 879                 } else {
 880                         if (cmd == SIOCGLIFADDR) {
 881                                 /* on getting an address, take the 1st match */
 882                                 match.s_addr = 0; /* gcc4 warning */
 883                                 cmp = 0;        /*XXX*/
 884                         } else {
 885                                 /* on deleting an address, do exact match */
 886                                 in_len2mask(&mask, 32);
 887                                 sin = (struct sockaddr_in *)&iflr->addr;
 888                                 match.s_addr = sin->sin_addr.s_addr;
 889
 890                                 cmp = 1;
 891                         }
 892                 }
 893
 894                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 895                         struct ifaddr *ifa = ifac->ifa;
 896
 897                         if (ifa->ifa_addr->sa_family != AF_INET6)
 898                                 continue;
 899                         if (!cmp)
 900                                 break;
 901                         candidate.s_addr =
 902                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 903                         candidate.s_addr &= mask.s_addr;
 904                         if (candidate.s_addr == match.s_addr)
 905                                 break;
 906                 }
 907                 if (ifac == NULL)
 908                         return EADDRNOTAVAIL;
 909                 ia = (struct in_ifaddr *)(ifac->ifa);
 910
 911                 if (cmd == SIOCGLIFADDR) {
 912                         /* fill in the if_laddrreq structure */
 913                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 914
 915                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 916                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 917                                         ia->ia_dstaddr.sin_len);
 918                         } else
 919                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 920
 921                         iflr->prefixlen =
 922                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 923
 924                         iflr->flags = 0;        /*XXX*/
 925
 926                         return 0;
 927                 } else {
 928                         struct in_aliasreq ifra;
 929
 930                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 931                         bzero(&ifra, sizeof ifra);
 932                         bcopy(iflr->iflr_name, ifra.ifra_name,
 933                                 sizeof ifra.ifra_name);
 934
 935                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 936                                 ia->ia_addr.sin_len);
 937                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 938                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 939                                         ia->ia_dstaddr.sin_len);
 940                         }
 941                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 942                                 ia->ia_sockmask.sin_len);
 943
 944                         return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
 945                                           ifp, td);
 946                 }
 947             }
 948         }
 949
 950         return EOPNOTSUPP;      /*just for safety*/
 951 }
 952
 953 /*
 954  * Delete any existing route for an interface.
 955  */
 956 void
 957 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
 958 {
 959         in_scrubprefix(ia);
 960 }
 961
 962 /*
 963  * Initialize an interface's internet address
 964  * and routing table entry.
 965  */
 966 static int
 967 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
 968           const struct sockaddr_in *sin, int scrub)
 969 {
 970         u_long i = ntohl(sin->sin_addr.s_addr);
 971         struct sockaddr_in oldaddr;
 972         struct ifaddr_container *ifac;
 973         int flags = RTF_UP, error = 0;
 974         int was_hash = 0;
 975
 976         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 977         oldaddr = ia->ia_addr;
 978
 979         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
 980                 was_hash = 1;
 981                 in_iahash_remove(ia);
 982         }
 983
 984         ia->ia_addr = *sin;
 985         if (ia->ia_addr.sin_family == AF_INET)
 986                 in_iahash_insert(ia);
 987
 988         /*
 989          * Give the interface a chance to initialize
 990          * if this is its first address,
 991          * and to validate the address if necessary.
 992          */
 993         if (ifp->if_ioctl != NULL) {
 994                 ifnet_serialize_all(ifp);
 995                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
 996                 ifnet_deserialize_all(ifp);
 997                 if (error)
 998                         goto fail;
 999         }
1000
1001         /*
1002          * Delete old route, if requested.
1003          */
1004         if (scrub) {
1005                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1006                 in_ifscrub(ifp, ia);
1007                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1008         }
1009
1010         /*
1011          * Calculate netmask/subnetmask.
1012          */
1013         if (IN_CLASSA(i))
1014                 ia->ia_netmask = IN_CLASSA_NET;
1015         else if (IN_CLASSB(i))
1016                 ia->ia_netmask = IN_CLASSB_NET;
1017         else
1018                 ia->ia_netmask = IN_CLASSC_NET;
1019         /*
1020          * The subnet mask usually includes at least the standard network part,
1021          * but may may be smaller in the case of supernetting.
1022          * If it is set, we believe it.
1023          */
1024         if (ia->ia_subnetmask == 0) {
1025                 ia->ia_subnetmask = ia->ia_netmask;
1026                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1027         } else {
1028                 ia->ia_netmask &= ia->ia_subnetmask;
1029         }
1030         ia->ia_net = i & ia->ia_netmask;
1031         ia->ia_subnet = i & ia->ia_subnetmask;
1032         in_socktrim(&ia->ia_sockmask);
1033
1034         /*
1035          * Add route for the network.
1036          */
1037         ia->ia_ifa.ifa_metric = ifp->if_metric;
1038         if (ifp->if_flags & IFF_BROADCAST) {
1039                 ia->ia_broadaddr.sin_addr.s_addr =
1040                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1041                 ia->ia_netbroadcast.s_addr =
1042                         htonl(ia->ia_net | ~ ia->ia_netmask);
1043         } else if (ifp->if_flags & IFF_LOOPBACK) {
1044                 ia->ia_dstaddr = ia->ia_addr;
1045                 flags |= RTF_HOST;
1046         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1047                 if (ia->ia_dstaddr.sin_family != AF_INET)
1048                         return (0);
1049                 flags |= RTF_HOST;
1050         }
1051
1052         /*-
1053          * Don't add host routes for interface addresses of
1054          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1055          * possible to assign several such address pairs with consistent
1056          * results (no host route) and is required by BOOTP.
1057          *
1058          * XXX: This is ugly !  There should be a way for the caller to
1059          *      say that they don't want a host route.
1060          */
1061         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1062             ia->ia_netmask != IN_CLASSA_NET ||
1063             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1064                 error = in_addprefix(ia, flags);
1065                 if (error)
1066                         goto fail;
1067         }
1068
1069         /*
1070          * If the interface supports multicast, join the "all hosts"
1071          * multicast group on that interface.
1072          */
1073         if (ifp->if_flags & IFF_MULTICAST) {
1074                 struct in_addr addr;
1075
1076                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1077                 in_addmulti(&addr, ifp);
1078         }
1079         return (0);
1080 fail:
1081         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1082                 in_iahash_remove(ia);
1083
1084         ia->ia_addr = oldaddr;
1085         if (was_hash)
1086                 in_iahash_insert(ia);
1087         return (error);
1088 }
1089
1090 #define rtinitflags(x) \
1091         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
1092          ? RTF_HOST : 0)
1093
1094 /*
1095  * Add a route to prefix ("connected route" in cisco terminology).
1096  * Do nothing, if there are some interface addresses with the same
1097  * prefix already.  This function assumes that the 'target' parent
1098  * interface is UP.
1099  */
1100 static int
1101 in_addprefix(struct in_ifaddr *target, int flags)
1102 {
1103         struct in_ifaddr_container *iac;
1104         struct in_addr prefix, mask;
1105         int error;
1106
1107 #ifdef CARP
1108         /*
1109          * Don't add prefix routes for CARP interfaces.
1110          * Prefix routes creation is handled by CARP
1111          * interfaces themselves.
1112          */
1113         if (target->ia_ifp->if_type == IFT_CARP)
1114                 return 0;
1115 #endif
1116
1117         mask = target->ia_sockmask.sin_addr;
1118         if (flags & RTF_HOST) {
1119                 prefix = target->ia_dstaddr.sin_addr;
1120         } else {
1121                 prefix = target->ia_addr.sin_addr;
1122                 prefix.s_addr &= mask.s_addr;
1123         }
1124
1125         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1126                 struct in_ifaddr *ia = iac->ia;
1127                 struct in_addr p;
1128
1129                 /* Don't test against self */
1130                 if (ia == target)
1131                         continue;
1132
1133                 /* The tested address does not own a route entry */
1134                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1135                         continue;
1136
1137                 /* Prefix test */
1138                 if (rtinitflags(ia)) {
1139                         p = ia->ia_dstaddr.sin_addr;
1140                 } else {
1141                         p = ia->ia_addr.sin_addr;
1142                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1143                 }
1144                 if (prefix.s_addr != p.s_addr)
1145                         continue;
1146
1147                 /*
1148                  * If the to-be-added address and the curretly being
1149                  * tested address are not host addresses, we need to
1150                  * take subnetmask into consideration.
1151                  */
1152                 if (!(flags & RTF_HOST) && !rtinitflags(ia) &&
1153                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1154                         continue;
1155
1156                 /*
1157                  * If we got a matching prefix route inserted by other
1158                  * interface address, we don't need to bother.
1159                  */
1160                 return 0;
1161         }
1162
1163         /*
1164          * No one seem to have prefix route; insert it.
1165          */
1166         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1167         if (!error)
1168                 target->ia_flags |= IFA_ROUTE;
1169         return error;
1170 }
1171
1172 /*
1173  * Remove a route to prefix ("connected route" in cisco terminology).
1174  * Re-installs the route by using another interface address, if there's
1175  * one with the same prefix (otherwise we lose the route mistakenly).
1176  */
1177 static void
1178 in_scrubprefix(struct in_ifaddr *target)
1179 {
1180         struct in_ifaddr_container *iac;
1181         struct in_addr prefix, mask;
1182         int error;
1183
1184 #ifdef CARP
1185         /*
1186          * Don't scrub prefix routes for CARP interfaces.
1187          * Prefix routes deletion is handled by CARP
1188          * interfaces themselves.
1189          */
1190         if (target->ia_ifp->if_type == IFT_CARP)
1191                 return;
1192 #endif
1193
1194         if ((target->ia_flags & IFA_ROUTE) == 0)
1195                 return;
1196
1197         mask = target->ia_sockmask.sin_addr;
1198         if (rtinitflags(target)) {
1199                 prefix = target->ia_dstaddr.sin_addr;
1200         } else {
1201                 prefix = target->ia_addr.sin_addr;
1202                 prefix.s_addr &= mask.s_addr;
1203         }
1204
1205         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1206                 struct in_ifaddr *ia = iac->ia;
1207                 struct in_addr p;
1208
1209                 /* Don't test against self */
1210                 if (ia == target)
1211                         continue;
1212
1213                 /* The tested address already owns a route entry */
1214                 if (ia->ia_flags & IFA_ROUTE)
1215                         continue;
1216
1217                 /*
1218                  * The prefix route of the tested address should
1219                  * never be installed if its parent interface is
1220                  * not UP yet.
1221                  */
1222                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1223                         continue;
1224
1225 #ifdef CARP
1226                 /*
1227                  * Don't add prefix routes for CARP interfaces.
1228                  * Prefix routes creation is handled by CARP
1229                  * interfaces themselves.
1230                  */
1231                 if (ia->ia_ifp->if_type == IFT_CARP)
1232                         continue;
1233 #endif
1234
1235                 /* Prefix test */
1236                 if (rtinitflags(ia)) {
1237                         p = ia->ia_dstaddr.sin_addr;
1238                 } else {
1239                         p = ia->ia_addr.sin_addr;
1240                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1241                 }
1242                 if (prefix.s_addr != p.s_addr)
1243                         continue;
1244
1245                 /*
1246                  * We don't need to test subnetmask here, as what we do
1247                  * in in_addprefix(), since if the the tested address's
1248                  * parent interface is UP, the tested address should own
1249                  * a prefix route entry and we would never reach here.
1250                  */
1251
1252                 /*
1253                  * If we got a matching prefix route, move IFA_ROUTE to him
1254                  */
1255                 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1256                 target->ia_flags &= ~IFA_ROUTE;
1257
1258                 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1259                 if (!error)
1260                         ia->ia_flags |= IFA_ROUTE;
1261                 return;
1262         }
1263
1264         /*
1265          * No candidates for this prefix route; just remove it.
1266          */
1267         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1268         target->ia_flags &= ~IFA_ROUTE;
1269 }
1270
1271 #undef rtinitflags
1272
1273 /*
1274  * Return 1 if the address might be a local broadcast address.
1275  */
1276 int
1277 in_broadcast(struct in_addr in, struct ifnet *ifp)
1278 {
1279         struct ifaddr_container *ifac;
1280         u_long t;
1281
1282         if (in.s_addr == INADDR_BROADCAST ||
1283             in.s_addr == INADDR_ANY)
1284                 return 1;
1285         if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0)
1286                 return 0;
1287         t = ntohl(in.s_addr);
1288         /*
1289          * Look through the list of addresses for a match
1290          * with a broadcast address.
1291          */
1292 #define ia ((struct in_ifaddr *)ifa)
1293         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1294                 struct ifaddr *ifa = ifac->ifa;
1295
1296                 if (ifa->ifa_addr->sa_family == AF_INET &&
1297                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1298                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1299                      /*
1300                       * Check for old-style (host 0) broadcast.
1301                       */
1302                      t == ia->ia_subnet || t == ia->ia_net) &&
1303                      /*
1304                       * Check for an all one subnetmask. These
1305                       * only exist when an interface gets a secondary
1306                       * address.
1307                       */
1308                      ia->ia_subnetmask != (u_long)0xffffffff)
1309                             return 1;
1310         }
1311         return (0);
1312 #undef ia
1313 }
1314
1315 /*
1316  * Add an address to the list of IP multicast addresses for a given interface.
1317  */
1318 struct in_multi *
1319 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1320 {
1321         struct in_multi *inm;
1322         int error;
1323         struct sockaddr_in sin;
1324         struct ifmultiaddr *ifma;
1325
1326         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1327             ("in_addmulti is not called in netisr0"));
1328
1329         /*
1330          * Call generic routine to add membership or increment
1331          * refcount.  It wants addresses in the form of a sockaddr,
1332          * so we build one here (being careful to zero the unused bytes).
1333          */
1334         bzero(&sin, sizeof sin);
1335         sin.sin_family = AF_INET;
1336         sin.sin_len = sizeof sin;
1337         sin.sin_addr = *ap;
1338         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1339         if (error)
1340                 return NULL;
1341
1342         /*
1343          * If ifma->ifma_protospec is null, then if_addmulti() created
1344          * a new record.  Otherwise, we are done.
1345          */
1346         if (ifma->ifma_protospec != NULL)
1347                 return ifma->ifma_protospec;
1348
1349         inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
1350         inm->inm_addr = *ap;
1351         inm->inm_ifp = ifp;
1352         inm->inm_ifma = ifma;
1353         ifma->ifma_protospec = inm;
1354         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1355
1356         /*
1357          * Let IGMP know that we have joined a new IP multicast group.
1358          */
1359         igmp_joingroup(inm);
1360         return inm;
1361 }
1362
1363 /*
1364  * Delete a multicast address record.
1365  */
1366 void
1367 in_delmulti(struct in_multi *inm)
1368 {
1369         struct ifmultiaddr *ifma;
1370         struct in_multi my_inm;
1371
1372         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1373             ("in_delmulti is not called in netisr0"));
1374
1375         ifma = inm->inm_ifma;
1376         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1377         if (ifma->ifma_refcount == 1) {
1378                 /*
1379                  * No remaining claims to this record; let IGMP know that
1380                  * we are leaving the multicast group.
1381                  * But do it after the if_delmulti() which might reset
1382                  * the interface and nuke the packet.
1383                  */
1384                 my_inm = *inm ;
1385                 ifma->ifma_protospec = NULL;
1386                 LIST_REMOVE(inm, inm_link);
1387                 kfree(inm, M_IPMADDR);
1388         }
1389         /* XXX - should be separate API for when we have an ifma? */
1390         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1391         if (my_inm.inm_ifp != NULL)
1392                 igmp_leavegroup(&my_inm);
1393 }
1394
1395 static void
1396 in_ifdetach_dispatch(netmsg_t nmsg)
1397 {
1398         struct lwkt_msg *lmsg = &nmsg->lmsg;
1399         struct ifnet *ifp = lmsg->u.ms_resultp;
1400         int cpu;
1401
1402         in_pcbpurgeif0(&ripcbinfo, ifp);
1403         for (cpu = 0; cpu < ncpus2; ++cpu)
1404                 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1405
1406         lwkt_replymsg(lmsg, 0);
1407 }
1408
1409 void
1410 in_ifdetach(struct ifnet *ifp)
1411 {
1412         struct netmsg_base nmsg;
1413         struct lwkt_msg *lmsg = &nmsg.lmsg;
1414
1415         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1416             in_ifdetach_dispatch);
1417         lmsg->u.ms_resultp = ifp;
1418
1419         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1420 }