sys/netinet/in.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)in.c        8.4 (Berkeley) 1/9/95
  30  * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
  31  */
  32
  33 #include "opt_bootp.h"
  34 #include "opt_carp.h"
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/sockio.h>
  39 #include <sys/malloc.h>
  40 #include <sys/proc.h>
  41 #include <sys/priv.h>
  42 #include <sys/msgport.h>
  43 #include <sys/socket.h>
  44
  45 #include <sys/kernel.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/if_types.h>
  51 #include <net/route.h>
  52 #include <net/netmsg2.h>
  53 #include <net/netisr2.h>
  54
  55 #include <netinet/in.h>
  56 #include <netinet/in_var.h>
  57 #include <netinet/in_pcb.h>
  58 #include <netinet/udp_var.h>
  59
  60 #include <netinet/igmp_var.h>
  61
  62 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
  63
  64 static int in_mask2len (struct in_addr *);
  65 static void in_len2mask (struct in_addr *, int);
  66 static int in_lifaddr_ioctl (u_long, caddr_t, struct ifnet *, struct thread *);
  67
  68 static void     in_socktrim (struct sockaddr_in *);
  69 static int      in_ifinit(struct ifnet *, struct in_ifaddr *,
  70                     const struct sockaddr_in *, int);
  71
  72 static int      in_control_internal(u_long, caddr_t, struct ifnet *,
  73                     struct thread *);
  74
  75 static int      in_addprefix(struct in_ifaddr *, int);
  76 static void     in_scrubprefix(struct in_ifaddr *);
  77
  78 static int subnetsarelocal = 0;
  79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  80     &subnetsarelocal, 0,
  81     "Count all internet addresses of subnets of the local net as local");
  82
  83 struct in_multihead in_multihead; /* XXX BSS initialization */
  84
  85 extern struct inpcbinfo ripcbinfo;
  86
  87 /*
  88  * Return 1 if an internet address is for a ``local'' host
  89  * (one to which we have a connection).  If subnetsarelocal
  90  * is true, this includes other subnets of the local net.
  91  * Otherwise, it includes only the directly-connected (sub)nets.
  92  */
  93 int
  94 in_localaddr(struct in_addr in)
  95 {
  96         u_long i = ntohl(in.s_addr);
  97         struct in_ifaddr_container *iac;
  98         struct in_ifaddr *ia;
  99
 100         if (subnetsarelocal) {
 101                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 102                         ia = iac->ia;
 103
 104                         if ((i & ia->ia_netmask) == ia->ia_net)
 105                                 return (1);
 106                 }
 107         } else {
 108                 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
 109                         ia = iac->ia;
 110
 111                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
 112                                 return (1);
 113                 }
 114         }
 115         return (0);
 116 }
 117
 118 /*
 119  * Determine whether an IP address is in a reserved set of addresses
 120  * that may not be forwarded, or whether datagrams to that destination
 121  * may be forwarded.
 122  */
 123 int
 124 in_canforward(struct in_addr in)
 125 {
 126         u_long i = ntohl(in.s_addr);
 127         u_long net;
 128
 129         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
 130                 return (0);
 131         if (IN_CLASSA(i)) {
 132                 net = i & IN_CLASSA_NET;
 133                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 134                         return (0);
 135         }
 136         return (1);
 137 }
 138
 139 /*
 140  * Trim a mask in a sockaddr
 141  */
 142 static void
 143 in_socktrim(struct sockaddr_in *ap)
 144 {
 145     char *cplim = (char *) &ap->sin_addr;
 146     char *cp = (char *) (&ap->sin_addr + 1);
 147
 148     ap->sin_len = 0;
 149     while (--cp >= cplim)
 150         if (*cp) {
 151             (ap)->sin_len = cp - (char *) (ap) + 1;
 152             break;
 153         }
 154 }
 155
 156 static int
 157 in_mask2len(struct in_addr *mask)
 158 {
 159         int x, y;
 160         u_char *p;
 161
 162         p = (u_char *)mask;
 163         for (x = 0; x < sizeof *mask; x++) {
 164                 if (p[x] != 0xff)
 165                         break;
 166         }
 167         y = 0;
 168         if (x < sizeof *mask) {
 169                 for (y = 0; y < 8; y++) {
 170                         if ((p[x] & (0x80 >> y)) == 0)
 171                                 break;
 172                 }
 173         }
 174         return x * 8 + y;
 175 }
 176
 177 static void
 178 in_len2mask(struct in_addr *mask, int len)
 179 {
 180         int i;
 181         u_char *p;
 182
 183         p = (u_char *)mask;
 184         bzero(mask, sizeof *mask);
 185         for (i = 0; i < len / 8; i++)
 186                 p[i] = 0xff;
 187         if (len % 8)
 188                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 189 }
 190
 191 void
 192 in_control_dispatch(netmsg_t msg)
 193 {
 194         int error;
 195
 196         error = in_control(msg->control.nm_cmd, msg->control.nm_data,
 197             msg->control.nm_ifp, msg->control.nm_td);
 198         lwkt_replymsg(&msg->lmsg, error);
 199 }
 200
 201 static void
 202 in_control_internal_dispatch(netmsg_t msg)
 203 {
 204         int error;
 205
 206         error = in_control_internal(msg->control.nm_cmd,
 207                                     msg->control.nm_data,
 208                                     msg->control.nm_ifp,
 209                                     msg->control.nm_td);
 210         lwkt_replymsg(&msg->lmsg, error);
 211 }
 212
 213 /*
 214  * Generic internet control operations (ioctl's).
 215  * Ifp is 0 if not an interface-specific ioctl.
 216  *
 217  * NOTE! td might be NULL.
 218  */
 219 int
 220 in_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
 221 {
 222         struct netmsg_pru_control msg;
 223
 224         switch (cmd) {
 225         /* change address */
 226         case SIOCALIFADDR:
 227         case SIOCDLIFADDR:
 228         case SIOCSIFDSTADDR:
 229         case SIOCSIFBRDADDR:
 230         case SIOCSIFADDR:
 231         case SIOCSIFNETMASK:
 232         case SIOCAIFADDR:
 233         case SIOCDIFADDR:
 234         case SIOCGIFALIAS:
 235                 /*
 236                  * Dispatch these SIOCs to netisr0.
 237                  */
 238                 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
 239                     in_control_internal_dispatch);
 240                 msg.nm_cmd = cmd;
 241                 msg.nm_data = data;
 242                 msg.nm_ifp = ifp;
 243                 msg.nm_td = td;
 244                 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
 245                 return msg.base.lmsg.ms_error;
 246
 247         default:
 248                 return in_control_internal(cmd, data, ifp, td);
 249         }
 250 }
 251
 252 static void
 253 in_ialink_dispatch(netmsg_t msg)
 254 {
 255         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 256         struct ifaddr_container *ifac;
 257         struct in_ifaddr_container *iac;
 258         int cpu = mycpuid;
 259
 260         crit_enter();
 261
 262         ifac = &ia->ia_ifa.ifa_containers[cpu];
 263         ASSERT_IFAC_VALID(ifac);
 264         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
 265                 ("ia is on in_ifaddrheads"));
 266
 267         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
 268         iac = &ifac->ifa_proto_u.u_in_ifac;
 269         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
 270
 271         crit_exit();
 272
 273         netisr_forwardmsg_all(&msg->base, cpu + 1);
 274 }
 275
 276 static void
 277 in_iaunlink_dispatch(netmsg_t msg)
 278 {
 279         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 280         struct ifaddr_container *ifac;
 281         struct in_ifaddr_container *iac;
 282         int cpu = mycpuid;
 283
 284         crit_enter();
 285
 286         ifac = &ia->ia_ifa.ifa_containers[cpu];
 287         ASSERT_IFAC_VALID(ifac);
 288         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 289                 ("ia is not on in_ifaddrheads"));
 290
 291         iac = &ifac->ifa_proto_u.u_in_ifac;
 292         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
 293         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
 294
 295         crit_exit();
 296
 297         netisr_forwardmsg_all(&msg->base, cpu + 1);
 298 }
 299
 300 static void
 301 in_iahashins_dispatch(netmsg_t msg)
 302 {
 303         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 304         struct ifaddr_container *ifac;
 305         struct in_ifaddr_container *iac;
 306         int cpu = mycpuid;
 307
 308         crit_enter();
 309
 310         ifac = &ia->ia_ifa.ifa_containers[cpu];
 311         ASSERT_IFAC_VALID(ifac);
 312         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 313                 ("ia is on in_ifaddrhashtbls"));
 314
 315         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
 316         iac = &ifac->ifa_proto_u.u_in_ifac;
 317         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 318                          iac, ia_hash);
 319
 320         crit_exit();
 321
 322         netisr_forwardmsg_all(&msg->base, cpu + 1);
 323 }
 324
 325 static void
 326 in_iahashrem_dispatch(netmsg_t msg)
 327 {
 328         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 329         struct ifaddr_container *ifac;
 330         struct in_ifaddr_container *iac;
 331         int cpu = mycpuid;
 332
 333         crit_enter();
 334
 335         ifac = &ia->ia_ifa.ifa_containers[cpu];
 336         ASSERT_IFAC_VALID(ifac);
 337         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
 338                 ("ia is not on in_ifaddrhashtbls"));
 339
 340         iac = &ifac->ifa_proto_u.u_in_ifac;
 341         LIST_REMOVE(iac, ia_hash);
 342         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
 343
 344         crit_exit();
 345
 346         netisr_forwardmsg_all(&msg->base, cpu + 1);
 347 }
 348
 349 static void
 350 in_ialink(struct in_ifaddr *ia)
 351 {
 352         struct netmsg_base msg;
 353
 354         netmsg_init(&msg, NULL, &curthread->td_msgport,
 355                     0, in_ialink_dispatch);
 356         msg.lmsg.u.ms_resultp = ia;
 357
 358         netisr_domsg(&msg, 0);
 359 }
 360
 361 void
 362 in_iaunlink(struct in_ifaddr *ia)
 363 {
 364         struct netmsg_base msg;
 365
 366         netmsg_init(&msg, NULL, &curthread->td_msgport,
 367                     0, in_iaunlink_dispatch);
 368         msg.lmsg.u.ms_resultp = ia;
 369
 370         netisr_domsg(&msg, 0);
 371 }
 372
 373 void
 374 in_iahash_insert(struct in_ifaddr *ia)
 375 {
 376         struct netmsg_base msg;
 377
 378         netmsg_init(&msg, NULL, &curthread->td_msgport,
 379                     0, in_iahashins_dispatch);
 380         msg.lmsg.u.ms_resultp = ia;
 381
 382         netisr_domsg(&msg, 0);
 383 }
 384
 385 void
 386 in_iahash_remove(struct in_ifaddr *ia)
 387 {
 388         struct netmsg_base msg;
 389
 390         netmsg_init(&msg, NULL, &curthread->td_msgport,
 391                     0, in_iahashrem_dispatch);
 392         msg.lmsg.u.ms_resultp = ia;
 393
 394         netisr_domsg(&msg, 0);
 395 }
 396
 397 static __inline struct in_ifaddr *
 398 in_ianext(struct in_ifaddr *oia)
 399 {
 400         struct ifaddr_container *ifac;
 401         struct in_ifaddr_container *iac;
 402
 403         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
 404         ASSERT_IFAC_VALID(ifac);
 405         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 406                 ("ia is not on in_ifaddrheads"));
 407
 408         iac = &ifac->ifa_proto_u.u_in_ifac;
 409         iac = TAILQ_NEXT(iac, ia_link);
 410         if (iac != NULL)
 411                 return iac->ia;
 412         else
 413                 return NULL;
 414 }
 415
 416 static int
 417 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
 418                     struct thread *td)
 419 {
 420         struct ifreq *ifr = (struct ifreq *)data;
 421         struct in_ifaddr *ia = NULL;
 422         struct in_addr dst;
 423         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 424         struct ifaddr_container *ifac;
 425         struct in_ifaddr_container *iac;
 426         struct sockaddr_in oldaddr;
 427         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
 428         int error = 0;
 429
 430         switch (cmd) {
 431         case SIOCALIFADDR:
 432         case SIOCDLIFADDR:
 433                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 434                         return error;
 435                 /* FALLTHROUGH */
 436         case SIOCGLIFADDR:
 437                 if (!ifp)
 438                         return EINVAL;
 439                 return in_lifaddr_ioctl(cmd, data, ifp, td);
 440         }
 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         case SIOCGIFALIAS:
 482                 if (ifp == NULL)
 483                         return (EADDRNOTAVAIL);
 484                 if (ifra->ifra_addr.sin_family == AF_INET) {
 485                         while (ia != NULL) {
 486                                 if (ia->ia_ifp == ifp  &&
 487                                     ia->ia_addr.sin_addr.s_addr ==
 488                                     ifra->ifra_addr.sin_addr.s_addr)
 489                                         break;
 490                                 ia = in_ianext(ia);
 491                         }
 492                         if ((ifp->if_flags & IFF_POINTOPOINT) &&
 493                             cmd == SIOCAIFADDR &&
 494                             ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
 495                                 return EDESTADDRREQ;
 496                         }
 497                 }
 498                 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL)
 499                         return (EADDRNOTAVAIL);
 500                 if (cmd == SIOCGIFALIAS)
 501                         break;
 502                 /* FALLTHROUGH */
 503         case SIOCSIFADDR:
 504         case SIOCSIFNETMASK:
 505         case SIOCSIFDSTADDR:
 506                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 507                         return error;
 508
 509                 if (ifp == NULL)
 510                         return (EADDRNOTAVAIL);
 511
 512                 if (cmd == SIOCSIFDSTADDR &&
 513                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
 514                         return (EINVAL);
 515
 516                 if (ia == NULL) {
 517                         struct ifaddr *ifa;
 518                         int i;
 519
 520                         ia = ifa_create(sizeof(*ia));
 521                         ifa = &ia->ia_ifa;
 522
 523                         /*
 524                          * Setup per-CPU information
 525                          */
 526                         for (i = 0; i < ncpus; ++i) {
 527                                 ifac = &ifa->ifa_containers[i];
 528                                 iac = &ifac->ifa_proto_u.u_in_ifac;
 529                                 iac->ia = ia;
 530                                 iac->ia_ifac = ifac;
 531                         }
 532
 533                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 534                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 535                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 536                         ia->ia_sockmask.sin_len = 8;
 537                         ia->ia_sockmask.sin_family = AF_INET;
 538                         if (ifp->if_flags & IFF_BROADCAST) {
 539                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 540                                 ia->ia_broadaddr.sin_family = AF_INET;
 541                         }
 542                         ia->ia_ifp = ifp;
 543                         iaIsNew = 1;
 544
 545                         in_ialink(ia);
 546                         ifa_iflink(ifa, ifp, 1);
 547                 }
 548                 break;
 549
 550         case SIOCSIFBRDADDR:
 551                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 552                         return error;
 553                 /* FALLTHROUGH */
 554
 555         case SIOCGIFADDR:
 556         case SIOCGIFNETMASK:
 557         case SIOCGIFDSTADDR:
 558         case SIOCGIFBRDADDR:
 559                 if (ia == NULL)
 560                         return (EADDRNOTAVAIL);
 561                 break;
 562         }
 563
 564         switch (cmd) {
 565         case SIOCGIFADDR:
 566                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 567                 return (0);
 568
 569         case SIOCGIFBRDADDR:
 570                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 571                         return (EINVAL);
 572                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 573                 return (0);
 574
 575         case SIOCGIFDSTADDR:
 576                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 577                         return (EINVAL);
 578                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 579                 return (0);
 580
 581         case SIOCGIFNETMASK:
 582                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 583                 return (0);
 584
 585         case SIOCSIFDSTADDR:
 586                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
 587
 588                 oldaddr = ia->ia_dstaddr;
 589                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 590                 if (ifp->if_ioctl != NULL) {
 591                         ifnet_serialize_all(ifp);
 592                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 593                                               td->td_proc->p_ucred);
 594                         ifnet_deserialize_all(ifp);
 595                         if (error) {
 596                                 ia->ia_dstaddr = oldaddr;
 597                                 return (error);
 598                         }
 599                 }
 600                 if (ia->ia_flags & IFA_ROUTE) {
 601                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 602                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 603                         ia->ia_ifa.ifa_dstaddr =
 604                                         (struct sockaddr *)&ia->ia_dstaddr;
 605                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 606                 }
 607                 return (0);
 608
 609         case SIOCSIFBRDADDR:
 610                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 611                         return (EINVAL);
 612                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 613                 return (0);
 614
 615         case SIOCSIFADDR:
 616                 error = in_ifinit(ifp, ia,
 617                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
 618                 if (error != 0 && iaIsNew)
 619                         break;
 620                 if (error == 0) {
 621                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 622                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 623                         &ia->ia_ifa);
 624                 }
 625                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 626                         /*
 627                          * Interface is brought up by in_ifinit()
 628                          * (via ifp->if_ioctl).  We act as if the
 629                          * interface got IFF_UP flag turned on.
 630                          */
 631                         if_up(ifp);
 632                 }
 633                 return (0);
 634
 635         case SIOCSIFNETMASK:
 636                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 637                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 638                 return (0);
 639
 640         case SIOCAIFADDR:
 641                 maskIsNew = 0;
 642                 hostIsNew = 1;
 643                 error = 0;
 644                 if (ia->ia_addr.sin_family == AF_INET) {
 645                         if (ifra->ifra_addr.sin_len == 0) {
 646                                 ifra->ifra_addr = ia->ia_addr;
 647                                 hostIsNew = 0;
 648                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 649                                    ia->ia_addr.sin_addr.s_addr) {
 650                                 hostIsNew = 0;
 651                         }
 652                 }
 653                 if (ifra->ifra_mask.sin_len) {
 654                         in_ifscrub(ifp, ia);
 655                         ia->ia_sockmask = ifra->ifra_mask;
 656                         ia->ia_sockmask.sin_family = AF_INET;
 657                         ia->ia_subnetmask =
 658                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
 659                         maskIsNew = 1;
 660                 }
 661                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 662                     ifra->ifra_dstaddr.sin_family == AF_INET) {
 663                         in_ifscrub(ifp, ia);
 664                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 665                         maskIsNew  = 1; /* We lie; but the effect's the same */
 666                 }
 667                 if (ifra->ifra_addr.sin_family == AF_INET &&
 668                     (hostIsNew || maskIsNew))
 669                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 670
 671                 if (error != 0 && iaIsNew)
 672                         break;
 673
 674                 if ((ifp->if_flags & IFF_BROADCAST) &&
 675                     ifra->ifra_broadaddr.sin_family == AF_INET)
 676                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 677                 if (error == 0) {
 678                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 679                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 680                         &ia->ia_ifa);
 681                 }
 682                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 683                         /* See the comment in SIOCSIFADDR */
 684                         if_up(ifp);
 685                 }
 686                 return (error);
 687
 688         case SIOCGIFALIAS:
 689                 ifra->ifra_mask = ia->ia_sockmask;
 690                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 691                     (ia->ia_dstaddr.sin_family == AF_INET))
 692                         ifra->ifra_dstaddr = ia->ia_dstaddr;
 693                 else if ((ifp->if_flags & IFF_BROADCAST) &&
 694                     (ia->ia_broadaddr.sin_family == AF_INET))
 695                         ifra->ifra_broadaddr = ia->ia_broadaddr;
 696                 else
 697                         memset(&ifra->ifra_broadaddr, 0,
 698                             sizeof(ifra->ifra_broadaddr));
 699                 return (0);
 700
 701         case SIOCDIFADDR:
 702                 /*
 703                  * in_ifscrub kills the interface route.
 704                  */
 705                 in_ifscrub(ifp, ia);
 706                 /*
 707                  * in_ifadown gets rid of all the rest of
 708                  * the routes.  This is not quite the right
 709                  * thing to do, but at least if we are running
 710                  * a routing process they will come back.
 711                  */
 712                 in_ifadown(&ia->ia_ifa, 1);
 713                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
 714                                     &ia->ia_ifa);
 715                 error = 0;
 716                 break;
 717
 718         default:
 719                 if (ifp == NULL || ifp->if_ioctl == NULL)
 720                         return (EOPNOTSUPP);
 721                 ifnet_serialize_all(ifp);
 722                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 723                 ifnet_deserialize_all(ifp);
 724                 return (error);
 725         }
 726
 727         KKASSERT(cmd == SIOCDIFADDR ||
 728                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
 729
 730         ifa_ifunlink(&ia->ia_ifa, ifp);
 731         in_iaunlink(ia);
 732
 733         if (cmd == SIOCDIFADDR) {
 734                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 735                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
 736                         in_iahash_remove(ia);
 737         }
 738 #ifdef INVARIANTS
 739         else {
 740                 /*
 741                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
 742                  * already taken care of the deletion from hash table
 743                  */
 744                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 745                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 746                         ("SIOC%cIFADDR failed on new ia, "
 747                          "but the new ia is still in hash table",
 748                          cmd == SIOCSIFADDR ? 'S' : 'A'));
 749         }
 750 #endif
 751
 752         ifa_destroy(&ia->ia_ifa);
 753
 754         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
 755             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
 756                 /*
 757                  * Though the address assignment failed, the
 758                  * interface is brought up by in_ifinit()
 759                  * (via ifp->if_ioctl).  With the hope that
 760                  * the interface has some valid addresses, we
 761                  * act as if IFF_UP flag was just set on the
 762                  * interface.
 763                  *
 764                  * NOTE:
 765                  * This could only be done after the failed
 766                  * address is unlinked from the global address
 767                  * list.
 768                  */
 769                 if_up(ifp);
 770         }
 771
 772         return (error);
 773 }
 774
 775 /*
 776  * SIOC[GAD]LIFADDR.
 777  *      SIOCGLIFADDR: get first address. (?!?)
 778  *      SIOCGLIFADDR with IFLR_PREFIX:
 779  *              get first address that matches the specified prefix.
 780  *      SIOCALIFADDR: add the specified address.
 781  *      SIOCALIFADDR with IFLR_PREFIX:
 782  *              EINVAL since we can't deduce hostid part of the address.
 783  *      SIOCDLIFADDR: delete the specified address.
 784  *      SIOCDLIFADDR with IFLR_PREFIX:
 785  *              delete the first address that matches the specified prefix.
 786  * return values:
 787  *      EINVAL on invalid parameters
 788  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 789  *      other values may be returned from in_ioctl()
 790  *
 791  * NOTE! td might be NULL.
 792  */
 793 static int
 794 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, 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_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp,
 855                     td);
 856             }
 857         case SIOCGLIFADDR:
 858         case SIOCDLIFADDR:
 859             {
 860                 struct ifaddr_container *ifac;
 861                 struct in_ifaddr *ia;
 862                 struct in_addr mask, candidate, match;
 863                 struct sockaddr_in *sin;
 864                 int cmp;
 865
 866                 bzero(&mask, sizeof mask);
 867                 if (iflr->flags & IFLR_PREFIX) {
 868                         /* lookup a prefix rather than address. */
 869                         in_len2mask(&mask, iflr->prefixlen);
 870
 871                         sin = (struct sockaddr_in *)&iflr->addr;
 872                         match.s_addr = sin->sin_addr.s_addr;
 873                         match.s_addr &= mask.s_addr;
 874
 875                         /* if you set extra bits, that's wrong */
 876                         if (match.s_addr != sin->sin_addr.s_addr)
 877                                 return EINVAL;
 878
 879                         cmp = 1;
 880                 } else {
 881                         if (cmd == SIOCGLIFADDR) {
 882                                 /* on getting an address, take the 1st match */
 883                                 match.s_addr = 0; /* gcc4 warning */
 884                                 cmp = 0;        /*XXX*/
 885                         } else {
 886                                 /* on deleting an address, do exact match */
 887                                 in_len2mask(&mask, 32);
 888                                 sin = (struct sockaddr_in *)&iflr->addr;
 889                                 match.s_addr = sin->sin_addr.s_addr;
 890
 891                                 cmp = 1;
 892                         }
 893                 }
 894
 895                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 896                         struct ifaddr *ifa = ifac->ifa;
 897
 898                         if (ifa->ifa_addr->sa_family != AF_INET6)
 899                                 continue;
 900                         if (!cmp)
 901                                 break;
 902                         candidate.s_addr =
 903                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 904                         candidate.s_addr &= mask.s_addr;
 905                         if (candidate.s_addr == match.s_addr)
 906                                 break;
 907                 }
 908                 if (ifac == NULL)
 909                         return EADDRNOTAVAIL;
 910                 ia = (struct in_ifaddr *)(ifac->ifa);
 911
 912                 if (cmd == SIOCGLIFADDR) {
 913                         /* fill in the if_laddrreq structure */
 914                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 915
 916                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 917                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 918                                         ia->ia_dstaddr.sin_len);
 919                         } else
 920                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 921
 922                         iflr->prefixlen =
 923                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 924
 925                         iflr->flags = 0;        /*XXX*/
 926
 927                         return 0;
 928                 } else {
 929                         struct in_aliasreq ifra;
 930
 931                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 932                         bzero(&ifra, sizeof ifra);
 933                         bcopy(iflr->iflr_name, ifra.ifra_name,
 934                                 sizeof ifra.ifra_name);
 935
 936                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 937                                 ia->ia_addr.sin_len);
 938                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 939                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 940                                         ia->ia_dstaddr.sin_len);
 941                         }
 942                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 943                                 ia->ia_sockmask.sin_len);
 944
 945                         return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra,
 946                             ifp, td);
 947                 }
 948             }
 949         }
 950
 951         return EOPNOTSUPP;      /*just for safety*/
 952 }
 953
 954 /*
 955  * Delete any existing route for an interface.
 956  */
 957 void
 958 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
 959 {
 960         in_scrubprefix(ia);
 961 }
 962
 963 /*
 964  * Initialize an interface's internet address
 965  * and routing table entry.
 966  */
 967 static int
 968 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
 969           const struct sockaddr_in *sin, int scrub)
 970 {
 971         u_long i = ntohl(sin->sin_addr.s_addr);
 972         struct sockaddr_in oldaddr;
 973         struct ifaddr_container *ifac;
 974         int flags = RTF_UP, error = 0;
 975         int was_hash = 0;
 976
 977         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 978         oldaddr = ia->ia_addr;
 979
 980         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
 981                 was_hash = 1;
 982                 in_iahash_remove(ia);
 983         }
 984
 985         ia->ia_addr = *sin;
 986         if (ia->ia_addr.sin_family == AF_INET)
 987                 in_iahash_insert(ia);
 988
 989         /*
 990          * Give the interface a chance to initialize
 991          * if this is its first address,
 992          * and to validate the address if necessary.
 993          */
 994         if (ifp->if_ioctl != NULL) {
 995                 ifnet_serialize_all(ifp);
 996                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
 997                 ifnet_deserialize_all(ifp);
 998                 if (error)
 999                         goto fail;
1000         }
1001
1002         /*
1003          * Delete old route, if requested.
1004          */
1005         if (scrub) {
1006                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1007                 in_ifscrub(ifp, ia);
1008                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1009         }
1010
1011         /*
1012          * Calculate netmask/subnetmask.
1013          */
1014         if (IN_CLASSA(i))
1015                 ia->ia_netmask = IN_CLASSA_NET;
1016         else if (IN_CLASSB(i))
1017                 ia->ia_netmask = IN_CLASSB_NET;
1018         else
1019                 ia->ia_netmask = IN_CLASSC_NET;
1020         /*
1021          * The subnet mask usually includes at least the standard network part,
1022          * but may may be smaller in the case of supernetting.
1023          * If it is set, we believe it.
1024          */
1025         if (ia->ia_subnetmask == 0) {
1026                 ia->ia_subnetmask = ia->ia_netmask;
1027                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1028         } else {
1029                 ia->ia_netmask &= ia->ia_subnetmask;
1030         }
1031         ia->ia_net = i & ia->ia_netmask;
1032         ia->ia_subnet = i & ia->ia_subnetmask;
1033         in_socktrim(&ia->ia_sockmask);
1034
1035         /*
1036          * Add route for the network.
1037          */
1038         ia->ia_ifa.ifa_metric = ifp->if_metric;
1039         if (ifp->if_flags & IFF_BROADCAST) {
1040                 if (ia->ia_subnetmask == IN_RFC3021_MASK) {
1041                         ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
1042                         ia->ia_netbroadcast.s_addr = INADDR_BROADCAST;
1043                 } else {
1044                         ia->ia_broadaddr.sin_addr.s_addr =
1045                                 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1046                         ia->ia_netbroadcast.s_addr =
1047                                 htonl(ia->ia_net | ~ ia->ia_netmask);
1048                 }
1049         } else if (ifp->if_flags & IFF_LOOPBACK) {
1050                 ia->ia_dstaddr = ia->ia_addr;
1051                 flags |= RTF_HOST;
1052         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1053                 if (ia->ia_dstaddr.sin_family != AF_INET)
1054                         return (0);
1055                 flags |= RTF_HOST;
1056         }
1057
1058         /*-
1059          * Don't add host routes for interface addresses of
1060          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1061          * possible to assign several such address pairs with consistent
1062          * results (no host route) and is required by BOOTP.
1063          *
1064          * XXX: This is ugly !  There should be a way for the caller to
1065          *      say that they don't want a host route.
1066          */
1067         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1068             ia->ia_netmask != IN_CLASSA_NET ||
1069             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1070                 error = in_addprefix(ia, flags);
1071                 if (error)
1072                         goto fail;
1073         }
1074
1075         /*
1076          * If the interface supports multicast, join the "all hosts"
1077          * multicast group on that interface.
1078          */
1079         if (ifp->if_flags & IFF_MULTICAST) {
1080                 struct in_addr addr;
1081
1082                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1083                 in_addmulti(&addr, ifp);
1084         }
1085         return (0);
1086 fail:
1087         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1088                 in_iahash_remove(ia);
1089
1090         ia->ia_addr = oldaddr;
1091         if (was_hash)
1092                 in_iahash_insert(ia);
1093         return (error);
1094 }
1095
1096 #define rtinitflags(x) \
1097         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
1098             ? RTF_HOST : 0)
1099
1100 /*
1101  * Add a route to prefix ("connected route" in cisco terminology).
1102  * Do nothing, if there are some interface addresses with the same
1103  * prefix already.  This function assumes that the 'target' parent
1104  * interface is UP.
1105  */
1106 static int
1107 in_addprefix(struct in_ifaddr *target, int flags)
1108 {
1109         struct in_ifaddr_container *iac;
1110         struct in_addr prefix, mask;
1111         int error;
1112
1113 #ifdef CARP
1114         /*
1115          * Don't add prefix routes for CARP interfaces.
1116          * Prefix routes creation is handled by CARP
1117          * interfaces themselves.
1118          */
1119         if (target->ia_ifp->if_type == IFT_CARP)
1120                 return 0;
1121 #endif
1122
1123         mask = target->ia_sockmask.sin_addr;
1124         if (flags & RTF_HOST) {
1125                 prefix = target->ia_dstaddr.sin_addr;
1126         } else {
1127                 prefix = target->ia_addr.sin_addr;
1128                 prefix.s_addr &= mask.s_addr;
1129         }
1130
1131         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1132                 struct in_ifaddr *ia = iac->ia;
1133                 struct in_addr p;
1134
1135                 /* Don't test against self */
1136                 if (ia == target)
1137                         continue;
1138
1139                 /* The tested address does not own a route entry */
1140                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1141                         continue;
1142
1143                 /* Prefix test */
1144                 if (rtinitflags(ia) != 0) {
1145                         p = ia->ia_dstaddr.sin_addr;
1146                 } else {
1147                         p = ia->ia_addr.sin_addr;
1148                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1149                 }
1150                 if (prefix.s_addr != p.s_addr)
1151                         continue;
1152
1153                 /*
1154                  * If the to-be-added address and the currently being
1155                  * tested address are not host addresses, we need to
1156                  * take subnetmask into consideration.
1157                  */
1158                 if (!(flags & RTF_HOST) && rtinitflags(ia) == 0 &&
1159                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1160                         continue;
1161
1162                 /*
1163                  * If we got a matching prefix route inserted by other
1164                  * interface address, we don't need to bother.
1165                  */
1166                 return 0;
1167         }
1168
1169         /*
1170          * No one seem to have prefix route; insert it.
1171          */
1172         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1173         if (!error)
1174                 target->ia_flags |= IFA_ROUTE;
1175         return error;
1176 }
1177
1178 /*
1179  * Remove a route to prefix ("connected route" in cisco terminology).
1180  * Re-installs the route by using another interface address, if there's
1181  * one with the same prefix (otherwise we lose the route mistakenly).
1182  */
1183 static void
1184 in_scrubprefix(struct in_ifaddr *target)
1185 {
1186         struct in_ifaddr_container *iac;
1187         struct in_addr prefix, mask;
1188         int error;
1189
1190 #ifdef CARP
1191         /*
1192          * Don't scrub prefix routes for CARP interfaces.
1193          * Prefix routes deletion is handled by CARP
1194          * interfaces themselves.
1195          */
1196         if (target->ia_ifp->if_type == IFT_CARP)
1197                 return;
1198 #endif
1199
1200         if ((target->ia_flags & IFA_ROUTE) == 0)
1201                 return;
1202
1203         mask = target->ia_sockmask.sin_addr;
1204         if (rtinitflags(target) != 0) {
1205                 prefix = target->ia_dstaddr.sin_addr;
1206         } else {
1207                 prefix = target->ia_addr.sin_addr;
1208                 prefix.s_addr &= mask.s_addr;
1209         }
1210
1211         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1212                 struct in_ifaddr *ia = iac->ia;
1213                 struct in_addr p;
1214
1215                 /* Don't test against self */
1216                 if (ia == target)
1217                         continue;
1218
1219                 /* The tested address already owns a route entry */
1220                 if (ia->ia_flags & IFA_ROUTE)
1221                         continue;
1222
1223                 /*
1224                  * The prefix route of the tested address should
1225                  * never be installed if its parent interface is
1226                  * not UP yet.
1227                  */
1228                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1229                         continue;
1230
1231 #ifdef CARP
1232                 /*
1233                  * Don't add prefix routes for CARP interfaces.
1234                  * Prefix routes creation is handled by CARP
1235                  * interfaces themselves.
1236                  */
1237                 if (ia->ia_ifp->if_type == IFT_CARP)
1238                         continue;
1239 #endif
1240
1241                 /* Prefix test */
1242                 if (rtinitflags(ia) != 0) {
1243                         p = ia->ia_dstaddr.sin_addr;
1244                 } else {
1245                         p = ia->ia_addr.sin_addr;
1246                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1247                 }
1248                 if (prefix.s_addr != p.s_addr)
1249                         continue;
1250
1251                 /*
1252                  * We don't need to test subnetmask here, as what we do
1253                  * in in_addprefix(), since if the the tested address's
1254                  * parent interface is UP, the tested address should own
1255                  * a prefix route entry and we would never reach here.
1256                  */
1257
1258                 /*
1259                  * If we got a matching prefix route, move IFA_ROUTE to him
1260                  */
1261                 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1262                 target->ia_flags &= ~IFA_ROUTE;
1263
1264                 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1265                 if (!error)
1266                         ia->ia_flags |= IFA_ROUTE;
1267                 return;
1268         }
1269
1270         /*
1271          * No candidates for this prefix route; just remove it.
1272          */
1273         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1274         target->ia_flags &= ~IFA_ROUTE;
1275 }
1276
1277 #undef rtinitflags
1278
1279 /*
1280  * Return 1 if the address might be a local broadcast address.
1281  */
1282 int
1283 in_broadcast(struct in_addr in, struct ifnet *ifp)
1284 {
1285         struct ifaddr_container *ifac;
1286         u_long t;
1287
1288         if (in.s_addr == INADDR_BROADCAST ||
1289             in.s_addr == INADDR_ANY)
1290                 return 1;
1291         if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0)
1292                 return 0;
1293         t = ntohl(in.s_addr);
1294         /*
1295          * Look through the list of addresses for a match
1296          * with a broadcast address.
1297          */
1298 #define ia ((struct in_ifaddr *)ifa)
1299         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1300                 struct ifaddr *ifa = ifac->ifa;
1301
1302                 if (ifa->ifa_addr->sa_family == AF_INET &&
1303                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1304                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1305                      /*
1306                       * Check for old-style (host 0) broadcast, but
1307                       * taking into account that RFC 3021 obsoletes it.
1308                       */
1309                      (ia->ia_subnetmask != IN_RFC3021_MASK &&
1310                      (t == ia->ia_subnet || t == ia->ia_net))) &&
1311                      /*
1312                       * Check for an all one subnetmask. These
1313                       * only exist when an interface gets a secondary
1314                       * address.
1315                       */
1316                      ia->ia_subnetmask != (u_long)0xffffffff)
1317                             return 1;
1318         }
1319         return (0);
1320 #undef ia
1321 }
1322
1323 /*
1324  * Add an address to the list of IP multicast addresses for a given interface.
1325  */
1326 struct in_multi *
1327 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1328 {
1329         struct in_multi *inm;
1330         int error;
1331         struct sockaddr_in sin;
1332         struct ifmultiaddr *ifma;
1333
1334         ASSERT_NETISR0;
1335
1336         /*
1337          * Call generic routine to add membership or increment
1338          * refcount.  It wants addresses in the form of a sockaddr,
1339          * so we build one here (being careful to zero the unused bytes).
1340          */
1341         bzero(&sin, sizeof sin);
1342         sin.sin_family = AF_INET;
1343         sin.sin_len = sizeof sin;
1344         sin.sin_addr = *ap;
1345         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1346         if (error)
1347                 return NULL;
1348
1349         /*
1350          * If ifma->ifma_protospec is null, then if_addmulti() created
1351          * a new record.  Otherwise, we are done.
1352          */
1353         if (ifma->ifma_protospec != NULL)
1354                 return ifma->ifma_protospec;
1355
1356         inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO);
1357         inm->inm_addr = *ap;
1358         inm->inm_ifp = ifp;
1359         inm->inm_ifma = ifma;
1360         ifma->ifma_protospec = inm;
1361         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1362
1363         /*
1364          * Let IGMP know that we have joined a new IP multicast group.
1365          */
1366         igmp_joingroup(inm);
1367         return inm;
1368 }
1369
1370 /*
1371  * Delete a multicast address record.
1372  */
1373 void
1374 in_delmulti(struct in_multi *inm)
1375 {
1376         struct ifmultiaddr *ifma;
1377         struct in_multi my_inm;
1378
1379         ASSERT_NETISR0;
1380
1381         ifma = inm->inm_ifma;
1382         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1383         if (ifma->ifma_refcount == 1) {
1384                 /*
1385                  * No remaining claims to this record; let IGMP know that
1386                  * we are leaving the multicast group.
1387                  * But do it after the if_delmulti() which might reset
1388                  * the interface and nuke the packet.
1389                  */
1390                 my_inm = *inm ;
1391                 ifma->ifma_protospec = NULL;
1392                 LIST_REMOVE(inm, inm_link);
1393                 kfree(inm, M_IPMADDR);
1394         }
1395         /* XXX - should be separate API for when we have an ifma? */
1396         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1397         if (my_inm.inm_ifp != NULL)
1398                 igmp_leavegroup(&my_inm);
1399 }
1400
1401 void
1402 in_if_down(struct ifnet *ifp)
1403 {
1404         rt_purgecloned(ifp, AF_INET);
1405 }
1406
1407 static void
1408 in_ifdetach_dispatch(netmsg_t nmsg)
1409 {
1410         struct lwkt_msg *lmsg = &nmsg->lmsg;
1411         struct ifnet *ifp = lmsg->u.ms_resultp;
1412         int cpu;
1413
1414         in_pcbpurgeif0(&ripcbinfo, ifp);
1415         for (cpu = 0; cpu < netisr_ncpus; ++cpu)
1416                 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1417
1418         lwkt_replymsg(lmsg, 0);
1419 }
1420
1421 void
1422 in_ifdetach(struct ifnet *ifp)
1423 {
1424         struct netmsg_base nmsg;
1425         struct lwkt_msg *lmsg = &nmsg.lmsg;
1426
1427         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1428             in_ifdetach_dispatch);
1429         lmsg->u.ms_resultp = ifp;
1430
1431         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1432 }