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 static int in_interfaces;       /* number of external internet interfaces */
 192
 193 void
 194 in_control_dispatch(netmsg_t msg)
 195 {
 196         int error;
 197
 198         error = in_control(msg->control.nm_cmd, msg->control.nm_data,
 199             msg->control.nm_ifp, msg->control.nm_td);
 200         lwkt_replymsg(&msg->lmsg, error);
 201 }
 202
 203 static void
 204 in_control_internal_dispatch(netmsg_t msg)
 205 {
 206         int error;
 207
 208         error = in_control_internal(msg->control.nm_cmd,
 209                                     msg->control.nm_data,
 210                                     msg->control.nm_ifp,
 211                                     msg->control.nm_td);
 212         lwkt_replymsg(&msg->lmsg, error);
 213 }
 214
 215 /*
 216  * Generic internet control operations (ioctl's).
 217  * Ifp is 0 if not an interface-specific ioctl.
 218  *
 219  * NOTE! td might be NULL.
 220  */
 221 int
 222 in_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
 223 {
 224         struct netmsg_pru_control msg;
 225
 226         switch (cmd) {
 227         /* change address */
 228         case SIOCALIFADDR:
 229         case SIOCDLIFADDR:
 230         case SIOCSIFDSTADDR:
 231         case SIOCSIFBRDADDR:
 232         case SIOCSIFADDR:
 233         case SIOCSIFNETMASK:
 234         case SIOCAIFADDR:
 235         case SIOCDIFADDR:
 236                 /*
 237                  * Dispatch these SIOCs to netisr0.
 238                  */
 239                 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
 240                     in_control_internal_dispatch);
 241                 msg.nm_cmd = cmd;
 242                 msg.nm_data = data;
 243                 msg.nm_ifp = ifp;
 244                 msg.nm_td = td;
 245                 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
 246                 return msg.base.lmsg.ms_error;
 247
 248         default:
 249                 return in_control_internal(cmd, data, ifp, td);
 250         }
 251 }
 252
 253 static void
 254 in_ialink_dispatch(netmsg_t msg)
 255 {
 256         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 257         struct ifaddr_container *ifac;
 258         struct in_ifaddr_container *iac;
 259         int cpu = mycpuid;
 260
 261         crit_enter();
 262
 263         ifac = &ia->ia_ifa.ifa_containers[cpu];
 264         ASSERT_IFAC_VALID(ifac);
 265         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
 266                 ("ia is on in_ifaddrheads"));
 267
 268         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
 269         iac = &ifac->ifa_proto_u.u_in_ifac;
 270         TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
 271
 272         crit_exit();
 273
 274         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 275 }
 276
 277 static void
 278 in_iaunlink_dispatch(netmsg_t msg)
 279 {
 280         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 281         struct ifaddr_container *ifac;
 282         struct in_ifaddr_container *iac;
 283         int cpu = mycpuid;
 284
 285         crit_enter();
 286
 287         ifac = &ia->ia_ifa.ifa_containers[cpu];
 288         ASSERT_IFAC_VALID(ifac);
 289         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 290                 ("ia is not on in_ifaddrheads"));
 291
 292         iac = &ifac->ifa_proto_u.u_in_ifac;
 293         TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
 294         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
 295
 296         crit_exit();
 297
 298         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 299 }
 300
 301 static void
 302 in_iahashins_dispatch(netmsg_t msg)
 303 {
 304         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 305         struct ifaddr_container *ifac;
 306         struct in_ifaddr_container *iac;
 307         int cpu = mycpuid;
 308
 309         crit_enter();
 310
 311         ifac = &ia->ia_ifa.ifa_containers[cpu];
 312         ASSERT_IFAC_VALID(ifac);
 313         KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 314                 ("ia is on in_ifaddrhashtbls"));
 315
 316         ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
 317         iac = &ifac->ifa_proto_u.u_in_ifac;
 318         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 319                          iac, ia_hash);
 320
 321         crit_exit();
 322
 323         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 324 }
 325
 326 static void
 327 in_iahashrem_dispatch(netmsg_t msg)
 328 {
 329         struct in_ifaddr *ia = msg->lmsg.u.ms_resultp;
 330         struct ifaddr_container *ifac;
 331         struct in_ifaddr_container *iac;
 332         int cpu = mycpuid;
 333
 334         crit_enter();
 335
 336         ifac = &ia->ia_ifa.ifa_containers[cpu];
 337         ASSERT_IFAC_VALID(ifac);
 338         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
 339                 ("ia is not on in_ifaddrhashtbls"));
 340
 341         iac = &ifac->ifa_proto_u.u_in_ifac;
 342         LIST_REMOVE(iac, ia_hash);
 343         ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
 344
 345         crit_exit();
 346
 347         ifa_forwardmsg(&msg->lmsg, cpu + 1);
 348 }
 349
 350 static void
 351 in_ialink(struct in_ifaddr *ia)
 352 {
 353         struct netmsg_base msg;
 354
 355         netmsg_init(&msg, NULL, &curthread->td_msgport,
 356                     0, in_ialink_dispatch);
 357         msg.lmsg.u.ms_resultp = ia;
 358
 359         ifa_domsg(&msg.lmsg, 0);
 360 }
 361
 362 void
 363 in_iaunlink(struct in_ifaddr *ia)
 364 {
 365         struct netmsg_base msg;
 366
 367         netmsg_init(&msg, NULL, &curthread->td_msgport,
 368                     0, in_iaunlink_dispatch);
 369         msg.lmsg.u.ms_resultp = ia;
 370
 371         ifa_domsg(&msg.lmsg, 0);
 372 }
 373
 374 void
 375 in_iahash_insert(struct in_ifaddr *ia)
 376 {
 377         struct netmsg_base msg;
 378
 379         netmsg_init(&msg, NULL, &curthread->td_msgport,
 380                     0, in_iahashins_dispatch);
 381         msg.lmsg.u.ms_resultp = ia;
 382
 383         ifa_domsg(&msg.lmsg, 0);
 384 }
 385
 386 void
 387 in_iahash_remove(struct in_ifaddr *ia)
 388 {
 389         struct netmsg_base msg;
 390
 391         netmsg_init(&msg, NULL, &curthread->td_msgport,
 392                     0, in_iahashrem_dispatch);
 393         msg.lmsg.u.ms_resultp = ia;
 394
 395         ifa_domsg(&msg.lmsg, 0);
 396 }
 397
 398 static __inline struct in_ifaddr *
 399 in_ianext(struct in_ifaddr *oia)
 400 {
 401         struct ifaddr_container *ifac;
 402         struct in_ifaddr_container *iac;
 403
 404         ifac = &oia->ia_ifa.ifa_containers[mycpuid];
 405         ASSERT_IFAC_VALID(ifac);
 406         KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
 407                 ("ia is not on in_ifaddrheads"));
 408
 409         iac = &ifac->ifa_proto_u.u_in_ifac;
 410         iac = TAILQ_NEXT(iac, ia_link);
 411         if (iac != NULL)
 412                 return iac->ia;
 413         else
 414                 return NULL;
 415 }
 416
 417 static int
 418 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
 419                     struct thread *td)
 420 {
 421         struct ifreq *ifr = (struct ifreq *)data;
 422         struct in_ifaddr *ia = NULL;
 423         struct in_addr dst;
 424         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 425         struct ifaddr_container *ifac;
 426         struct in_ifaddr_container *iac;
 427         struct sockaddr_in oldaddr;
 428         int hostIsNew, iaIsNew, maskIsNew, ifpWasUp;
 429         int error = 0;
 430
 431         switch (cmd) {
 432         case SIOCALIFADDR:
 433         case SIOCDLIFADDR:
 434                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 435                         return error;
 436                 /* FALLTHROUGH */
 437         case SIOCGLIFADDR:
 438                 if (!ifp)
 439                         return EINVAL;
 440                 return in_lifaddr_ioctl(cmd, data, ifp, td);
 441         }
 442
 443         iaIsNew = 0;
 444         ifpWasUp = 0;
 445
 446         /*
 447          * Find address for this interface, if it exists.
 448          *
 449          * If an alias address was specified, find that one instead of
 450          * the first one on the interface, if possible
 451          */
 452         if (ifp) {
 453                 struct in_ifaddr *iap;
 454
 455                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 456                 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
 457                         iap = iac->ia;
 458                         if (iap->ia_ifp == ifp &&
 459                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 460                                 ia = iap;
 461                                 break;
 462                         }
 463                 }
 464                 if (ia == NULL) {
 465                         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
 466                                       ifa_link) {
 467                                 iap = ifatoia(ifac->ifa);
 468                                 if (iap->ia_addr.sin_family == AF_INET) {
 469                                         ia = iap;
 470                                         break;
 471                                 }
 472                         }
 473                 }
 474
 475                 if (ifp->if_flags & IFF_UP)
 476                         ifpWasUp = 1;
 477         }
 478
 479         switch (cmd) {
 480         case SIOCAIFADDR:
 481         case SIOCDIFADDR:
 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 && ia == NULL)
 499                         return (EADDRNOTAVAIL);
 500                 /* FALLTHROUGH */
 501         case SIOCSIFADDR:
 502         case SIOCSIFNETMASK:
 503         case SIOCSIFDSTADDR:
 504                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 505                         return error;
 506
 507                 if (ifp == NULL)
 508                         return (EADDRNOTAVAIL);
 509
 510                 if (cmd == SIOCSIFDSTADDR &&
 511                     (ifp->if_flags & IFF_POINTOPOINT) == 0)
 512                         return (EINVAL);
 513
 514                 if (ia == NULL) {
 515                         struct ifaddr *ifa;
 516                         int i;
 517
 518                         ia = ifa_create(sizeof(*ia), M_WAITOK);
 519                         ifa = &ia->ia_ifa;
 520
 521                         /*
 522                          * Setup per-CPU information
 523                          */
 524                         for (i = 0; i < ncpus; ++i) {
 525                                 ifac = &ifa->ifa_containers[i];
 526                                 iac = &ifac->ifa_proto_u.u_in_ifac;
 527                                 iac->ia = ia;
 528                                 iac->ia_ifac = ifac;
 529                         }
 530
 531                         /*
 532                          * Protect from NETISR_IP traversing address list
 533                          * while we're modifying it.
 534                          */
 535                         crit_enter();
 536
 537                         in_ialink(ia);
 538                         ifa_iflink(ifa, ifp, 1);
 539
 540                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 541                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 542                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 543                         ia->ia_sockmask.sin_len = 8;
 544                         ia->ia_sockmask.sin_family = AF_INET;
 545                         if (ifp->if_flags & IFF_BROADCAST) {
 546                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 547                                 ia->ia_broadaddr.sin_family = AF_INET;
 548                         }
 549                         ia->ia_ifp = ifp;
 550                         if (!(ifp->if_flags & IFF_LOOPBACK))
 551                                 in_interfaces++;
 552                         iaIsNew = 1;
 553
 554                         crit_exit();
 555                 }
 556                 break;
 557
 558         case SIOCSIFBRDADDR:
 559                 if (td && (error = priv_check(td, PRIV_ROOT)) != 0)
 560                         return error;
 561                 /* FALLTHROUGH */
 562
 563         case SIOCGIFADDR:
 564         case SIOCGIFNETMASK:
 565         case SIOCGIFDSTADDR:
 566         case SIOCGIFBRDADDR:
 567                 if (ia == NULL)
 568                         return (EADDRNOTAVAIL);
 569                 break;
 570         }
 571
 572         switch (cmd) {
 573         case SIOCGIFADDR:
 574                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 575                 return (0);
 576
 577         case SIOCGIFBRDADDR:
 578                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 579                         return (EINVAL);
 580                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 581                 return (0);
 582
 583         case SIOCGIFDSTADDR:
 584                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 585                         return (EINVAL);
 586                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 587                 return (0);
 588
 589         case SIOCGIFNETMASK:
 590                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 591                 return (0);
 592
 593         case SIOCSIFDSTADDR:
 594                 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
 595
 596                 oldaddr = ia->ia_dstaddr;
 597                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 598                 if (ifp->if_ioctl != NULL) {
 599                         ifnet_serialize_all(ifp);
 600                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 601                                               td->td_proc->p_ucred);
 602                         ifnet_deserialize_all(ifp);
 603                         if (error) {
 604                                 ia->ia_dstaddr = oldaddr;
 605                                 return (error);
 606                         }
 607                 }
 608                 if (ia->ia_flags & IFA_ROUTE) {
 609                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 610                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 611                         ia->ia_ifa.ifa_dstaddr =
 612                                         (struct sockaddr *)&ia->ia_dstaddr;
 613                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 614                 }
 615                 return (0);
 616
 617         case SIOCSIFBRDADDR:
 618                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 619                         return (EINVAL);
 620                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 621                 return (0);
 622
 623         case SIOCSIFADDR:
 624                 error = in_ifinit(ifp, ia,
 625                     (const struct sockaddr_in *)&ifr->ifr_addr, 1);
 626                 if (error != 0 && iaIsNew)
 627                         break;
 628                 if (error == 0) {
 629                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 630                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 631                         &ia->ia_ifa);
 632                 }
 633                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 634                         /*
 635                          * Interface is brought up by in_ifinit()
 636                          * (via ifp->if_ioctl).  We act as if the
 637                          * interface got IFF_UP flag turned on.
 638                          */
 639                         if_up(ifp);
 640                 }
 641                 return (0);
 642
 643         case SIOCSIFNETMASK:
 644                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 645                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 646                 return (0);
 647
 648         case SIOCAIFADDR:
 649                 maskIsNew = 0;
 650                 hostIsNew = 1;
 651                 error = 0;
 652                 if (ia->ia_addr.sin_family == AF_INET) {
 653                         if (ifra->ifra_addr.sin_len == 0) {
 654                                 ifra->ifra_addr = ia->ia_addr;
 655                                 hostIsNew = 0;
 656                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 657                                    ia->ia_addr.sin_addr.s_addr) {
 658                                 hostIsNew = 0;
 659                         }
 660                 }
 661                 if (ifra->ifra_mask.sin_len) {
 662                         in_ifscrub(ifp, ia);
 663                         ia->ia_sockmask = ifra->ifra_mask;
 664                         ia->ia_sockmask.sin_family = AF_INET;
 665                         ia->ia_subnetmask =
 666                             ntohl(ia->ia_sockmask.sin_addr.s_addr);
 667                         maskIsNew = 1;
 668                 }
 669                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 670                     ifra->ifra_dstaddr.sin_family == AF_INET) {
 671                         in_ifscrub(ifp, ia);
 672                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 673                         maskIsNew  = 1; /* We lie; but the effect's the same */
 674                 }
 675                 if (ifra->ifra_addr.sin_family == AF_INET &&
 676                     (hostIsNew || maskIsNew))
 677                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 678
 679                 if (error != 0 && iaIsNew)
 680                         break;
 681
 682                 if ((ifp->if_flags & IFF_BROADCAST) &&
 683                     ifra->ifra_broadaddr.sin_family == AF_INET)
 684                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 685                 if (error == 0) {
 686                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
 687                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
 688                         &ia->ia_ifa);
 689                 }
 690                 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) {
 691                         /* See the comment in SIOCSIFADDR */
 692                         if_up(ifp);
 693                 }
 694                 return (error);
 695
 696         case SIOCDIFADDR:
 697                 /*
 698                  * in_ifscrub kills the interface route.
 699                  */
 700                 in_ifscrub(ifp, ia);
 701                 /*
 702                  * in_ifadown gets rid of all the rest of
 703                  * the routes.  This is not quite the right
 704                  * thing to do, but at least if we are running
 705                  * a routing process they will come back.
 706                  */
 707                 in_ifadown(&ia->ia_ifa, 1);
 708                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
 709                                     &ia->ia_ifa);
 710                 error = 0;
 711                 break;
 712
 713         default:
 714                 if (ifp == NULL || ifp->if_ioctl == NULL)
 715                         return (EOPNOTSUPP);
 716                 ifnet_serialize_all(ifp);
 717                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 718                 ifnet_deserialize_all(ifp);
 719                 return (error);
 720         }
 721
 722         KKASSERT(cmd == SIOCDIFADDR ||
 723                  ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
 724
 725         ifa_ifunlink(&ia->ia_ifa, ifp);
 726         in_iaunlink(ia);
 727
 728         if (cmd == SIOCDIFADDR) {
 729                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 730                 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
 731                         in_iahash_remove(ia);
 732         }
 733 #ifdef INVARIANTS
 734         else {
 735                 /*
 736                  * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
 737                  * already taken care of the deletion from hash table
 738                  */
 739                 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 740                 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
 741                         ("SIOC%cIFADDR failed on new ia, "
 742                          "but the new ia is still in hash table",
 743                          cmd == SIOCSIFADDR ? 'S' : 'A'));
 744         }
 745 #endif
 746
 747         ifa_destroy(&ia->ia_ifa);
 748
 749         if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) &&
 750             !ifpWasUp && (ifp->if_flags & IFF_UP)) {
 751                 /*
 752                  * Though the address assignment failed, the
 753                  * interface is brought up by in_ifinit()
 754                  * (via ifp->if_ioctl).  With the hope that
 755                  * the interface has some valid addresses, we
 756                  * act as if IFF_UP flag was just set on the
 757                  * interface.
 758                  *
 759                  * NOTE:
 760                  * This could only be done after the failed
 761                  * address is unlinked from the global address
 762                  * list.
 763                  */
 764                 if_up(ifp);
 765         }
 766
 767         return (error);
 768 }
 769
 770 /*
 771  * SIOC[GAD]LIFADDR.
 772  *      SIOCGLIFADDR: get first address. (?!?)
 773  *      SIOCGLIFADDR with IFLR_PREFIX:
 774  *              get first address that matches the specified prefix.
 775  *      SIOCALIFADDR: add the specified address.
 776  *      SIOCALIFADDR with IFLR_PREFIX:
 777  *              EINVAL since we can't deduce hostid part of the address.
 778  *      SIOCDLIFADDR: delete the specified address.
 779  *      SIOCDLIFADDR with IFLR_PREFIX:
 780  *              delete the first address that matches the specified prefix.
 781  * return values:
 782  *      EINVAL on invalid parameters
 783  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 784  *      other values may be returned from in_ioctl()
 785  *
 786  * NOTE! td might be NULL.
 787  */
 788 static int
 789 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
 790 {
 791         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 792
 793         /* sanity checks */
 794         if (!data || !ifp) {
 795                 panic("invalid argument to in_lifaddr_ioctl");
 796                 /*NOTRECHED*/
 797         }
 798
 799         switch (cmd) {
 800         case SIOCGLIFADDR:
 801                 /* address must be specified on GET with IFLR_PREFIX */
 802                 if ((iflr->flags & IFLR_PREFIX) == 0)
 803                         break;
 804                 /*FALLTHROUGH*/
 805         case SIOCALIFADDR:
 806         case SIOCDLIFADDR:
 807                 /* address must be specified on ADD and DELETE */
 808                 if (iflr->addr.ss_family != AF_INET)
 809                         return EINVAL;
 810                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 811                         return EINVAL;
 812                 /* XXX need improvement */
 813                 if (iflr->dstaddr.ss_family
 814                  && iflr->dstaddr.ss_family != AF_INET)
 815                         return EINVAL;
 816                 if (iflr->dstaddr.ss_family
 817                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 818                         return EINVAL;
 819                 break;
 820         default: /*shouldn't happen*/
 821                 return EOPNOTSUPP;
 822         }
 823         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 824                 return EINVAL;
 825
 826         switch (cmd) {
 827         case SIOCALIFADDR:
 828             {
 829                 struct in_aliasreq ifra;
 830
 831                 if (iflr->flags & IFLR_PREFIX)
 832                         return EINVAL;
 833
 834                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 835                 bzero(&ifra, sizeof ifra);
 836                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
 837
 838                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 839
 840                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 841                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 842                                 iflr->dstaddr.ss_len);
 843                 }
 844
 845                 ifra.ifra_mask.sin_family = AF_INET;
 846                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 847                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 848
 849                 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp,
 850                     td);
 851             }
 852         case SIOCGLIFADDR:
 853         case SIOCDLIFADDR:
 854             {
 855                 struct ifaddr_container *ifac;
 856                 struct in_ifaddr *ia;
 857                 struct in_addr mask, candidate, match;
 858                 struct sockaddr_in *sin;
 859                 int cmp;
 860
 861                 bzero(&mask, sizeof mask);
 862                 if (iflr->flags & IFLR_PREFIX) {
 863                         /* lookup a prefix rather than address. */
 864                         in_len2mask(&mask, iflr->prefixlen);
 865
 866                         sin = (struct sockaddr_in *)&iflr->addr;
 867                         match.s_addr = sin->sin_addr.s_addr;
 868                         match.s_addr &= mask.s_addr;
 869
 870                         /* if you set extra bits, that's wrong */
 871                         if (match.s_addr != sin->sin_addr.s_addr)
 872                                 return EINVAL;
 873
 874                         cmp = 1;
 875                 } else {
 876                         if (cmd == SIOCGLIFADDR) {
 877                                 /* on getting an address, take the 1st match */
 878                                 match.s_addr = 0; /* gcc4 warning */
 879                                 cmp = 0;        /*XXX*/
 880                         } else {
 881                                 /* on deleting an address, do exact match */
 882                                 in_len2mask(&mask, 32);
 883                                 sin = (struct sockaddr_in *)&iflr->addr;
 884                                 match.s_addr = sin->sin_addr.s_addr;
 885
 886                                 cmp = 1;
 887                         }
 888                 }
 889
 890                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 891                         struct ifaddr *ifa = ifac->ifa;
 892
 893                         if (ifa->ifa_addr->sa_family != AF_INET6)
 894                                 continue;
 895                         if (!cmp)
 896                                 break;
 897                         candidate.s_addr =
 898                         ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 899                         candidate.s_addr &= mask.s_addr;
 900                         if (candidate.s_addr == match.s_addr)
 901                                 break;
 902                 }
 903                 if (ifac == NULL)
 904                         return EADDRNOTAVAIL;
 905                 ia = (struct in_ifaddr *)(ifac->ifa);
 906
 907                 if (cmd == SIOCGLIFADDR) {
 908                         /* fill in the if_laddrreq structure */
 909                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 910
 911                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 912                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 913                                         ia->ia_dstaddr.sin_len);
 914                         } else
 915                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 916
 917                         iflr->prefixlen =
 918                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 919
 920                         iflr->flags = 0;        /*XXX*/
 921
 922                         return 0;
 923                 } else {
 924                         struct in_aliasreq ifra;
 925
 926                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 927                         bzero(&ifra, sizeof ifra);
 928                         bcopy(iflr->iflr_name, ifra.ifra_name,
 929                                 sizeof ifra.ifra_name);
 930
 931                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 932                                 ia->ia_addr.sin_len);
 933                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 934                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 935                                         ia->ia_dstaddr.sin_len);
 936                         }
 937                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 938                                 ia->ia_sockmask.sin_len);
 939
 940                         return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra,
 941                             ifp, td);
 942                 }
 943             }
 944         }
 945
 946         return EOPNOTSUPP;      /*just for safety*/
 947 }
 948
 949 /*
 950  * Delete any existing route for an interface.
 951  */
 952 void
 953 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia)
 954 {
 955         in_scrubprefix(ia);
 956 }
 957
 958 /*
 959  * Initialize an interface's internet address
 960  * and routing table entry.
 961  */
 962 static int
 963 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
 964           const struct sockaddr_in *sin, int scrub)
 965 {
 966         u_long i = ntohl(sin->sin_addr.s_addr);
 967         struct sockaddr_in oldaddr;
 968         struct ifaddr_container *ifac;
 969         int flags = RTF_UP, error = 0;
 970         int was_hash = 0;
 971
 972         ifac = &ia->ia_ifa.ifa_containers[mycpuid];
 973         oldaddr = ia->ia_addr;
 974
 975         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
 976                 was_hash = 1;
 977                 in_iahash_remove(ia);
 978         }
 979
 980         ia->ia_addr = *sin;
 981         if (ia->ia_addr.sin_family == AF_INET)
 982                 in_iahash_insert(ia);
 983
 984         /*
 985          * Give the interface a chance to initialize
 986          * if this is its first address,
 987          * and to validate the address if necessary.
 988          */
 989         if (ifp->if_ioctl != NULL) {
 990                 ifnet_serialize_all(ifp);
 991                 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
 992                 ifnet_deserialize_all(ifp);
 993                 if (error)
 994                         goto fail;
 995         }
 996
 997         /*
 998          * Delete old route, if requested.
 999          */
1000         if (scrub) {
1001                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
1002                 in_ifscrub(ifp, ia);
1003                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1004         }
1005
1006         /*
1007          * Calculate netmask/subnetmask.
1008          */
1009         if (IN_CLASSA(i))
1010                 ia->ia_netmask = IN_CLASSA_NET;
1011         else if (IN_CLASSB(i))
1012                 ia->ia_netmask = IN_CLASSB_NET;
1013         else
1014                 ia->ia_netmask = IN_CLASSC_NET;
1015         /*
1016          * The subnet mask usually includes at least the standard network part,
1017          * but may may be smaller in the case of supernetting.
1018          * If it is set, we believe it.
1019          */
1020         if (ia->ia_subnetmask == 0) {
1021                 ia->ia_subnetmask = ia->ia_netmask;
1022                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1023         } else {
1024                 ia->ia_netmask &= ia->ia_subnetmask;
1025         }
1026         ia->ia_net = i & ia->ia_netmask;
1027         ia->ia_subnet = i & ia->ia_subnetmask;
1028         in_socktrim(&ia->ia_sockmask);
1029
1030         /*
1031          * Add route for the network.
1032          */
1033         ia->ia_ifa.ifa_metric = ifp->if_metric;
1034         if (ifp->if_flags & IFF_BROADCAST) {
1035                 ia->ia_broadaddr.sin_addr.s_addr =
1036                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1037                 ia->ia_netbroadcast.s_addr =
1038                         htonl(ia->ia_net | ~ ia->ia_netmask);
1039         } else if (ifp->if_flags & IFF_LOOPBACK) {
1040                 ia->ia_dstaddr = ia->ia_addr;
1041                 flags |= RTF_HOST;
1042         } else if (ifp->if_flags & IFF_POINTOPOINT) {
1043                 if (ia->ia_dstaddr.sin_family != AF_INET)
1044                         return (0);
1045                 flags |= RTF_HOST;
1046         }
1047
1048         /*-
1049          * Don't add host routes for interface addresses of
1050          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
1051          * possible to assign several such address pairs with consistent
1052          * results (no host route) and is required by BOOTP.
1053          *
1054          * XXX: This is ugly !  There should be a way for the caller to
1055          *      say that they don't want a host route.
1056          */
1057         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1058             ia->ia_netmask != IN_CLASSA_NET ||
1059             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1060                 error = in_addprefix(ia, flags);
1061                 if (error)
1062                         goto fail;
1063         }
1064
1065         /*
1066          * If the interface supports multicast, join the "all hosts"
1067          * multicast group on that interface.
1068          */
1069         if (ifp->if_flags & IFF_MULTICAST) {
1070                 struct in_addr addr;
1071
1072                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1073                 in_addmulti(&addr, ifp);
1074         }
1075         return (0);
1076 fail:
1077         if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1078                 in_iahash_remove(ia);
1079
1080         ia->ia_addr = oldaddr;
1081         if (was_hash)
1082                 in_iahash_insert(ia);
1083         return (error);
1084 }
1085
1086 #define rtinitflags(x) \
1087         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
1088          ? RTF_HOST : 0)
1089
1090 /*
1091  * Add a route to prefix ("connected route" in cisco terminology).
1092  * Do nothing, if there are some interface addresses with the same
1093  * prefix already.  This function assumes that the 'target' parent
1094  * interface is UP.
1095  */
1096 static int
1097 in_addprefix(struct in_ifaddr *target, int flags)
1098 {
1099         struct in_ifaddr_container *iac;
1100         struct in_addr prefix, mask;
1101         int error;
1102
1103 #ifdef CARP
1104         /*
1105          * Don't add prefix routes for CARP interfaces.
1106          * Prefix routes creation is handled by CARP
1107          * interfaces themselves.
1108          */
1109         if (target->ia_ifp->if_type == IFT_CARP)
1110                 return 0;
1111 #endif
1112
1113         mask = target->ia_sockmask.sin_addr;
1114         if (flags & RTF_HOST) {
1115                 prefix = target->ia_dstaddr.sin_addr;
1116         } else {
1117                 prefix = target->ia_addr.sin_addr;
1118                 prefix.s_addr &= mask.s_addr;
1119         }
1120
1121         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1122                 struct in_ifaddr *ia = iac->ia;
1123                 struct in_addr p;
1124
1125                 /* Don't test against self */
1126                 if (ia == target)
1127                         continue;
1128
1129                 /* The tested address does not own a route entry */
1130                 if ((ia->ia_flags & IFA_ROUTE) == 0)
1131                         continue;
1132
1133                 /* Prefix test */
1134                 if (rtinitflags(ia)) {
1135                         p = ia->ia_dstaddr.sin_addr;
1136                 } else {
1137                         p = ia->ia_addr.sin_addr;
1138                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1139                 }
1140                 if (prefix.s_addr != p.s_addr)
1141                         continue;
1142
1143                 /*
1144                  * If the to-be-added address and the curretly being
1145                  * tested address are not host addresses, we need to
1146                  * take subnetmask into consideration.
1147                  */
1148                 if (!(flags & RTF_HOST) && !rtinitflags(ia) &&
1149                     mask.s_addr != ia->ia_sockmask.sin_addr.s_addr)
1150                         continue;
1151
1152                 /*
1153                  * If we got a matching prefix route inserted by other
1154                  * interface address, we don't need to bother.
1155                  */
1156                 return 0;
1157         }
1158
1159         /*
1160          * No one seem to have prefix route; insert it.
1161          */
1162         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
1163         if (!error)
1164                 target->ia_flags |= IFA_ROUTE;
1165         return error;
1166 }
1167
1168 /*
1169  * Remove a route to prefix ("connected route" in cisco terminology).
1170  * Re-installs the route by using another interface address, if there's
1171  * one with the same prefix (otherwise we lose the route mistakenly).
1172  */
1173 static void
1174 in_scrubprefix(struct in_ifaddr *target)
1175 {
1176         struct in_ifaddr_container *iac;
1177         struct in_addr prefix, mask;
1178         int error;
1179
1180 #ifdef CARP
1181         /*
1182          * Don't scrub prefix routes for CARP interfaces.
1183          * Prefix routes deletion is handled by CARP
1184          * interfaces themselves.
1185          */
1186         if (target->ia_ifp->if_type == IFT_CARP)
1187                 return;
1188 #endif
1189
1190         if ((target->ia_flags & IFA_ROUTE) == 0)
1191                 return;
1192
1193         mask = target->ia_sockmask.sin_addr;
1194         if (rtinitflags(target)) {
1195                 prefix = target->ia_dstaddr.sin_addr;
1196         } else {
1197                 prefix = target->ia_addr.sin_addr;
1198                 prefix.s_addr &= mask.s_addr;
1199         }
1200
1201         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1202                 struct in_ifaddr *ia = iac->ia;
1203                 struct in_addr p;
1204
1205                 /* Don't test against self */
1206                 if (ia == target)
1207                         continue;
1208
1209                 /* The tested address already owns a route entry */
1210                 if (ia->ia_flags & IFA_ROUTE)
1211                         continue;
1212
1213                 /*
1214                  * The prefix route of the tested address should
1215                  * never be installed if its parent interface is
1216                  * not UP yet.
1217                  */
1218                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1219                         continue;
1220
1221 #ifdef CARP
1222                 /*
1223                  * Don't add prefix routes for CARP interfaces.
1224                  * Prefix routes creation is handled by CARP
1225                  * interfaces themselves.
1226                  */
1227                 if (ia->ia_ifp->if_type == IFT_CARP)
1228                         continue;
1229 #endif
1230
1231                 /* Prefix test */
1232                 if (rtinitflags(ia)) {
1233                         p = ia->ia_dstaddr.sin_addr;
1234                 } else {
1235                         p = ia->ia_addr.sin_addr;
1236                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1237                 }
1238                 if (prefix.s_addr != p.s_addr)
1239                         continue;
1240
1241                 /*
1242                  * We don't need to test subnetmask here, as what we do
1243                  * in in_addprefix(), since if the the tested address's
1244                  * parent interface is UP, the tested address should own
1245                  * a prefix route entry and we would never reach here.
1246                  */
1247
1248                 /*
1249                  * If we got a matching prefix route, move IFA_ROUTE to him
1250                  */
1251                 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1252                 target->ia_flags &= ~IFA_ROUTE;
1253
1254                 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
1255                 if (!error)
1256                         ia->ia_flags |= IFA_ROUTE;
1257                 return;
1258         }
1259
1260         /*
1261          * No candidates for this prefix route; just remove it.
1262          */
1263         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
1264         target->ia_flags &= ~IFA_ROUTE;
1265 }
1266
1267 #undef rtinitflags
1268
1269 /*
1270  * Return 1 if the address might be a local broadcast address.
1271  */
1272 int
1273 in_broadcast(struct in_addr in, struct ifnet *ifp)
1274 {
1275         struct ifaddr_container *ifac;
1276         u_long t;
1277
1278         if (in.s_addr == INADDR_BROADCAST ||
1279             in.s_addr == INADDR_ANY)
1280                 return 1;
1281         if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0)
1282                 return 0;
1283         t = ntohl(in.s_addr);
1284         /*
1285          * Look through the list of addresses for a match
1286          * with a broadcast address.
1287          */
1288 #define ia ((struct in_ifaddr *)ifa)
1289         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1290                 struct ifaddr *ifa = ifac->ifa;
1291
1292                 if (ifa->ifa_addr->sa_family == AF_INET &&
1293                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1294                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1295                      /*
1296                       * Check for old-style (host 0) broadcast.
1297                       */
1298                      t == ia->ia_subnet || t == ia->ia_net) &&
1299                      /*
1300                       * Check for an all one subnetmask. These
1301                       * only exist when an interface gets a secondary
1302                       * address.
1303                       */
1304                      ia->ia_subnetmask != (u_long)0xffffffff)
1305                             return 1;
1306         }
1307         return (0);
1308 #undef ia
1309 }
1310
1311 /*
1312  * Add an address to the list of IP multicast addresses for a given interface.
1313  */
1314 struct in_multi *
1315 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1316 {
1317         struct in_multi *inm;
1318         int error;
1319         struct sockaddr_in sin;
1320         struct ifmultiaddr *ifma;
1321
1322         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1323             ("in_addmulti is not called in netisr0"));
1324
1325         /*
1326          * Call generic routine to add membership or increment
1327          * refcount.  It wants addresses in the form of a sockaddr,
1328          * so we build one here (being careful to zero the unused bytes).
1329          */
1330         bzero(&sin, sizeof sin);
1331         sin.sin_family = AF_INET;
1332         sin.sin_len = sizeof sin;
1333         sin.sin_addr = *ap;
1334         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1335         if (error)
1336                 return NULL;
1337
1338         /*
1339          * If ifma->ifma_protospec is null, then if_addmulti() created
1340          * a new record.  Otherwise, we are done.
1341          */
1342         if (ifma->ifma_protospec != NULL)
1343                 return ifma->ifma_protospec;
1344
1345         inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
1346         inm->inm_addr = *ap;
1347         inm->inm_ifp = ifp;
1348         inm->inm_ifma = ifma;
1349         ifma->ifma_protospec = inm;
1350         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1351
1352         /*
1353          * Let IGMP know that we have joined a new IP multicast group.
1354          */
1355         igmp_joingroup(inm);
1356         return inm;
1357 }
1358
1359 /*
1360  * Delete a multicast address record.
1361  */
1362 void
1363 in_delmulti(struct in_multi *inm)
1364 {
1365         struct ifmultiaddr *ifma;
1366         struct in_multi my_inm;
1367
1368         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1369             ("in_delmulti is not called in netisr0"));
1370
1371         ifma = inm->inm_ifma;
1372         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1373         if (ifma->ifma_refcount == 1) {
1374                 /*
1375                  * No remaining claims to this record; let IGMP know that
1376                  * we are leaving the multicast group.
1377                  * But do it after the if_delmulti() which might reset
1378                  * the interface and nuke the packet.
1379                  */
1380                 my_inm = *inm ;
1381                 ifma->ifma_protospec = NULL;
1382                 LIST_REMOVE(inm, inm_link);
1383                 kfree(inm, M_IPMADDR);
1384         }
1385         /* XXX - should be separate API for when we have an ifma? */
1386         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1387         if (my_inm.inm_ifp != NULL)
1388                 igmp_leavegroup(&my_inm);
1389 }
1390
1391 static void
1392 in_ifdetach_dispatch(netmsg_t nmsg)
1393 {
1394         struct lwkt_msg *lmsg = &nmsg->lmsg;
1395         struct ifnet *ifp = lmsg->u.ms_resultp;
1396         int cpu;
1397
1398         in_pcbpurgeif0(&ripcbinfo, ifp);
1399         for (cpu = 0; cpu < ncpus2; ++cpu)
1400                 in_pcbpurgeif0(&udbinfo[cpu], ifp);
1401
1402         lwkt_replymsg(lmsg, 0);
1403 }
1404
1405 void
1406 in_ifdetach(struct ifnet *ifp)
1407 {
1408         struct netmsg_base nmsg;
1409         struct lwkt_msg *lmsg = &nmsg.lmsg;
1410
1411         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1412             in_ifdetach_dispatch);
1413         lmsg->u.ms_resultp = ifp;
1414
1415         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1416 }