sys/netinet/in.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (C) 2001 WIDE Project.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      @(#)in.c        8.4 (Berkeley) 1/9/95
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include "opt_carp.h"
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/sockio.h>
  41 #include <sys/malloc.h>
  42 #include <sys/priv.h>
  43 #include <sys/socket.h>
  44 #include <sys/jail.h>
  45 #include <sys/kernel.h>
  46 #include <sys/proc.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/syslog.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_dl.h>
  53 #include <net/if_llatbl.h>
  54 #include <net/if_types.h>
  55 #include <net/route.h>
  56 #include <net/vnet.h>
  57
  58 #include <netinet/in.h>
  59 #include <netinet/in_var.h>
  60 #include <netinet/in_pcb.h>
  61 #include <netinet/ip_var.h>
  62 #include <netinet/igmp_var.h>
  63 #include <netinet/udp.h>
  64 #include <netinet/udp_var.h>
  65
  66 static int in_mask2len(struct in_addr *);
  67 static void in_len2mask(struct in_addr *, int);
  68 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
  69         struct ifnet *, struct thread *);
  70
  71 static int      in_addprefix(struct in_ifaddr *, int);
  72 static int      in_scrubprefix(struct in_ifaddr *);
  73 static void     in_socktrim(struct sockaddr_in *);
  74 static int      in_ifinit(struct ifnet *,
  75             struct in_ifaddr *, struct sockaddr_in *, int);
  76 static void     in_purgemaddrs(struct ifnet *);
  77
  78 static VNET_DEFINE(int, subnetsarelocal);
  79 static VNET_DEFINE(int, sameprefixcarponly);
  80 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  81
  82 #define V_subnetsarelocal               VNET(subnetsarelocal)
  83 #define V_sameprefixcarponly            VNET(sameprefixcarponly)
  84 #define V_ripcbinfo                     VNET(ripcbinfo)
  85
  86 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  87         &VNET_NAME(subnetsarelocal), 0,
  88         "Treat all subnets as directly connected");
  89 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
  90         &VNET_NAME(sameprefixcarponly), 0,
  91         "Refuse to create same prefixes on different interfaces");
  92
  93 /*
  94  * Return 1 if an internet address is for a ``local'' host
  95  * (one to which we have a connection).  If subnetsarelocal
  96  * is true, this includes other subnets of the local net.
  97  * Otherwise, it includes only the directly-connected (sub)nets.
  98  */
  99 int
 100 in_localaddr(struct in_addr in)
 101 {
 102         register u_long i = ntohl(in.s_addr);
 103         register struct in_ifaddr *ia;
 104
 105         IN_IFADDR_RLOCK();
 106         if (V_subnetsarelocal) {
 107                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 108                         if ((i & ia->ia_netmask) == ia->ia_net) {
 109                                 IN_IFADDR_RUNLOCK();
 110                                 return (1);
 111                         }
 112                 }
 113         } else {
 114                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 115                         if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
 116                                 IN_IFADDR_RUNLOCK();
 117                                 return (1);
 118                         }
 119                 }
 120         }
 121         IN_IFADDR_RUNLOCK();
 122         return (0);
 123 }
 124
 125 /*
 126  * Return 1 if an internet address is for the local host and configured
 127  * on one of its interfaces.
 128  */
 129 int
 130 in_localip(struct in_addr in)
 131 {
 132         struct in_ifaddr *ia;
 133
 134         IN_IFADDR_RLOCK();
 135         LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
 136                 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
 137                         IN_IFADDR_RUNLOCK();
 138                         return (1);
 139                 }
 140         }
 141         IN_IFADDR_RUNLOCK();
 142         return (0);
 143 }
 144
 145 /*
 146  * Determine whether an IP address is in a reserved set of addresses
 147  * that may not be forwarded, or whether datagrams to that destination
 148  * may be forwarded.
 149  */
 150 int
 151 in_canforward(struct in_addr in)
 152 {
 153         register u_long i = ntohl(in.s_addr);
 154         register u_long net;
 155
 156         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
 157                 return (0);
 158         if (IN_CLASSA(i)) {
 159                 net = i & IN_CLASSA_NET;
 160                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 161                         return (0);
 162         }
 163         return (1);
 164 }
 165
 166 /*
 167  * Trim a mask in a sockaddr
 168  */
 169 static void
 170 in_socktrim(struct sockaddr_in *ap)
 171 {
 172     register char *cplim = (char *) &ap->sin_addr;
 173     register char *cp = (char *) (&ap->sin_addr + 1);
 174
 175     ap->sin_len = 0;
 176     while (--cp >= cplim)
 177         if (*cp) {
 178             (ap)->sin_len = cp - (char *) (ap) + 1;
 179             break;
 180         }
 181 }
 182
 183 static int
 184 in_mask2len(mask)
 185         struct in_addr *mask;
 186 {
 187         int x, y;
 188         u_char *p;
 189
 190         p = (u_char *)mask;
 191         for (x = 0; x < sizeof(*mask); x++) {
 192                 if (p[x] != 0xff)
 193                         break;
 194         }
 195         y = 0;
 196         if (x < sizeof(*mask)) {
 197                 for (y = 0; y < 8; y++) {
 198                         if ((p[x] & (0x80 >> y)) == 0)
 199                                 break;
 200                 }
 201         }
 202         return (x * 8 + y);
 203 }
 204
 205 static void
 206 in_len2mask(struct in_addr *mask, int len)
 207 {
 208         int i;
 209         u_char *p;
 210
 211         p = (u_char *)mask;
 212         bzero(mask, sizeof(*mask));
 213         for (i = 0; i < len / 8; i++)
 214                 p[i] = 0xff;
 215         if (len % 8)
 216                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 217 }
 218
 219 /*
 220  * Generic internet control operations (ioctl's).
 221  *
 222  * ifp is NULL if not an interface-specific ioctl.
 223  */
 224 /* ARGSUSED */
 225 int
 226 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 227     struct thread *td)
 228 {
 229         register struct ifreq *ifr = (struct ifreq *)data;
 230         register struct in_ifaddr *ia, *iap;
 231         register struct ifaddr *ifa;
 232         struct in_addr allhosts_addr;
 233         struct in_addr dst;
 234         struct in_ifinfo *ii;
 235         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 236         struct sockaddr_in oldaddr;
 237         int error, hostIsNew, iaIsNew, maskIsNew;
 238         int iaIsFirst;
 239
 240         ia = NULL;
 241         iaIsFirst = 0;
 242         iaIsNew = 0;
 243         allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
 244
 245         /*
 246          * Filter out ioctls we implement directly; forward the rest on to
 247          * in_lifaddr_ioctl() and ifp->if_ioctl().
 248          */
 249         switch (cmd) {
 250         case SIOCAIFADDR:
 251         case SIOCDIFADDR:
 252         case SIOCGIFADDR:
 253         case SIOCGIFBRDADDR:
 254         case SIOCGIFDSTADDR:
 255         case SIOCGIFNETMASK:
 256         case SIOCSIFADDR:
 257         case SIOCSIFBRDADDR:
 258         case SIOCSIFDSTADDR:
 259         case SIOCSIFNETMASK:
 260                 break;
 261
 262         case SIOCALIFADDR:
 263                 if (td != NULL) {
 264                         error = priv_check(td, PRIV_NET_ADDIFADDR);
 265                         if (error)
 266                                 return (error);
 267                 }
 268                 if (ifp == NULL)
 269                         return (EINVAL);
 270                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 271
 272         case SIOCDLIFADDR:
 273                 if (td != NULL) {
 274                         error = priv_check(td, PRIV_NET_DELIFADDR);
 275                         if (error)
 276                                 return (error);
 277                 }
 278                 if (ifp == NULL)
 279                         return (EINVAL);
 280                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 281
 282         case SIOCGLIFADDR:
 283                 if (ifp == NULL)
 284                         return (EINVAL);
 285                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 286
 287         default:
 288                 if (ifp == NULL || ifp->if_ioctl == NULL)
 289                         return (EOPNOTSUPP);
 290                 return ((*ifp->if_ioctl)(ifp, cmd, data));
 291         }
 292
 293         if (ifp == NULL)
 294                 return (EADDRNOTAVAIL);
 295
 296         /*
 297          * Security checks before we get involved in any work.
 298          */
 299         switch (cmd) {
 300         case SIOCAIFADDR:
 301         case SIOCSIFADDR:
 302         case SIOCSIFBRDADDR:
 303         case SIOCSIFNETMASK:
 304         case SIOCSIFDSTADDR:
 305                 if (td != NULL) {
 306                         error = priv_check(td, PRIV_NET_ADDIFADDR);
 307                         if (error)
 308                                 return (error);
 309                 }
 310                 break;
 311
 312         case SIOCDIFADDR:
 313                 if (td != NULL) {
 314                         error = priv_check(td, PRIV_NET_DELIFADDR);
 315                         if (error)
 316                                 return (error);
 317                 }
 318                 break;
 319         }
 320
 321         /*
 322          * Find address for this interface, if it exists.
 323          *
 324          * If an alias address was specified, find that one instead of the
 325          * first one on the interface, if possible.
 326          */
 327         dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 328         IN_IFADDR_RLOCK();
 329         LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) {
 330                 if (iap->ia_ifp == ifp &&
 331                     iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 332                         if (td == NULL || prison_check_ip4(td->td_ucred,
 333                             &dst) == 0)
 334                                 ia = iap;
 335                         break;
 336                 }
 337         }
 338         if (ia != NULL)
 339                 ifa_ref(&ia->ia_ifa);
 340         IN_IFADDR_RUNLOCK();
 341         if (ia == NULL) {
 342                 IF_ADDR_LOCK(ifp);
 343                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 344                         iap = ifatoia(ifa);
 345                         if (iap->ia_addr.sin_family == AF_INET) {
 346                                 if (td != NULL &&
 347                                     prison_check_ip4(td->td_ucred,
 348                                     &iap->ia_addr.sin_addr) != 0)
 349                                         continue;
 350                                 ia = iap;
 351                                 break;
 352                         }
 353                 }
 354                 if (ia != NULL)
 355                         ifa_ref(&ia->ia_ifa);
 356                 IF_ADDR_UNLOCK(ifp);
 357         }
 358         if (ia == NULL)
 359                 iaIsFirst = 1;
 360
 361         error = 0;
 362         switch (cmd) {
 363         case SIOCAIFADDR:
 364         case SIOCDIFADDR:
 365                 if (ifra->ifra_addr.sin_family == AF_INET) {
 366                         struct in_ifaddr *oia;
 367
 368                         IN_IFADDR_RLOCK();
 369                         for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
 370                                 if (ia->ia_ifp == ifp  &&
 371                                     ia->ia_addr.sin_addr.s_addr ==
 372                                     ifra->ifra_addr.sin_addr.s_addr)
 373                                         break;
 374                         }
 375                         if (ia != NULL && ia != oia)
 376                                 ifa_ref(&ia->ia_ifa);
 377                         if (oia != NULL && ia != oia)
 378                                 ifa_free(&oia->ia_ifa);
 379                         IN_IFADDR_RUNLOCK();
 380                         if ((ifp->if_flags & IFF_POINTOPOINT)
 381                             && (cmd == SIOCAIFADDR)
 382                             && (ifra->ifra_dstaddr.sin_addr.s_addr
 383                                 == INADDR_ANY)) {
 384                                 error = EDESTADDRREQ;
 385                                 goto out;
 386                         }
 387                 }
 388                 if (cmd == SIOCDIFADDR && ia == NULL) {
 389                         error = EADDRNOTAVAIL;
 390                         goto out;
 391                 }
 392                 /* FALLTHROUGH */
 393         case SIOCSIFADDR:
 394         case SIOCSIFNETMASK:
 395         case SIOCSIFDSTADDR:
 396                 if (ia == NULL) {
 397                         ia = (struct in_ifaddr *)
 398                                 malloc(sizeof *ia, M_IFADDR, M_NOWAIT |
 399                                     M_ZERO);
 400                         if (ia == NULL) {
 401                                 error = ENOBUFS;
 402                                 goto out;
 403                         }
 404
 405                         ifa = &ia->ia_ifa;
 406                         ifa_init(ifa);
 407                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 408                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 409                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 410
 411                         ia->ia_sockmask.sin_len = 8;
 412                         ia->ia_sockmask.sin_family = AF_INET;
 413                         if (ifp->if_flags & IFF_BROADCAST) {
 414                                 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
 415                                 ia->ia_broadaddr.sin_family = AF_INET;
 416                         }
 417                         ia->ia_ifp = ifp;
 418
 419                         ifa_ref(ifa);                   /* if_addrhead */
 420                         IF_ADDR_LOCK(ifp);
 421                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 422                         IF_ADDR_UNLOCK(ifp);
 423                         ifa_ref(ifa);                   /* in_ifaddrhead */
 424                         IN_IFADDR_WLOCK();
 425                         TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
 426                         IN_IFADDR_WUNLOCK();
 427                         iaIsNew = 1;
 428                 }
 429                 break;
 430
 431         case SIOCSIFBRDADDR:
 432         case SIOCGIFADDR:
 433         case SIOCGIFNETMASK:
 434         case SIOCGIFDSTADDR:
 435         case SIOCGIFBRDADDR:
 436                 if (ia == NULL) {
 437                         error = EADDRNOTAVAIL;
 438                         goto out;
 439                 }
 440                 break;
 441         }
 442
 443         /*
 444          * Most paths in this switch return directly or via out.  Only paths
 445          * that remove the address break in order to hit common removal code.
 446          */
 447         switch (cmd) {
 448         case SIOCGIFADDR:
 449                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 450                 goto out;
 451
 452         case SIOCGIFBRDADDR:
 453                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 454                         error = EINVAL;
 455                         goto out;
 456                 }
 457                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 458                 goto out;
 459
 460         case SIOCGIFDSTADDR:
 461                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
 462                         error = EINVAL;
 463                         goto out;
 464                 }
 465                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 466                 goto out;
 467
 468         case SIOCGIFNETMASK:
 469                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 470                 goto out;
 471
 472         case SIOCSIFDSTADDR:
 473                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
 474                         error = EINVAL;
 475                         goto out;
 476                 }
 477                 oldaddr = ia->ia_dstaddr;
 478                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 479                 if (ifp->if_ioctl != NULL) {
 480                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
 481                             (caddr_t)ia);
 482                         if (error) {
 483                                 ia->ia_dstaddr = oldaddr;
 484                                 goto out;
 485                         }
 486                 }
 487                 if (ia->ia_flags & IFA_ROUTE) {
 488                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 489                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 490                         ia->ia_ifa.ifa_dstaddr =
 491                                         (struct sockaddr *)&ia->ia_dstaddr;
 492                         rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 493                 }
 494                 goto out;
 495
 496         case SIOCSIFBRDADDR:
 497                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 498                         error = EINVAL;
 499                         goto out;
 500                 }
 501                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 502                 goto out;
 503
 504         case SIOCSIFADDR:
 505                 error = in_ifinit(ifp, ia,
 506                     (struct sockaddr_in *) &ifr->ifr_addr, 1);
 507                 if (error != 0 && iaIsNew)
 508                         break;
 509                 if (error == 0) {
 510                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 511                         if (iaIsFirst &&
 512                             (ifp->if_flags & IFF_MULTICAST) != 0) {
 513                                 error = in_joingroup(ifp, &allhosts_addr,
 514                                     NULL, &ii->ii_allhosts);
 515                         }
 516                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 517                 }
 518                 error = 0;
 519                 goto out;
 520
 521         case SIOCSIFNETMASK:
 522                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 523                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 524                 goto out;
 525
 526         case SIOCAIFADDR:
 527                 maskIsNew = 0;
 528                 hostIsNew = 1;
 529                 error = 0;
 530                 if (ia->ia_addr.sin_family == AF_INET) {
 531                         if (ifra->ifra_addr.sin_len == 0) {
 532                                 ifra->ifra_addr = ia->ia_addr;
 533                                 hostIsNew = 0;
 534                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 535                                                ia->ia_addr.sin_addr.s_addr)
 536                                 hostIsNew = 0;
 537                 }
 538                 if (ifra->ifra_mask.sin_len) {
 539                         in_ifscrub(ifp, ia);
 540                         ia->ia_sockmask = ifra->ifra_mask;
 541                         ia->ia_sockmask.sin_family = AF_INET;
 542                         ia->ia_subnetmask =
 543                              ntohl(ia->ia_sockmask.sin_addr.s_addr);
 544                         maskIsNew = 1;
 545                 }
 546                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 547                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
 548                         in_ifscrub(ifp, ia);
 549                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 550                         maskIsNew  = 1; /* We lie; but the effect's the same */
 551                 }
 552                 if (ifra->ifra_addr.sin_family == AF_INET &&
 553                     (hostIsNew || maskIsNew))
 554                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 555                 if (error != 0 && iaIsNew)
 556                         goto out;
 557
 558                 if ((ifp->if_flags & IFF_BROADCAST) &&
 559                     (ifra->ifra_broadaddr.sin_family == AF_INET))
 560                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 561                 if (error == 0) {
 562                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 563                         if (iaIsFirst &&
 564                             (ifp->if_flags & IFF_MULTICAST) != 0) {
 565                                 error = in_joingroup(ifp, &allhosts_addr,
 566                                     NULL, &ii->ii_allhosts);
 567                         }
 568                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 569                 }
 570                 goto out;
 571
 572         case SIOCDIFADDR:
 573                 /*
 574                  * in_ifscrub kills the interface route.
 575                  */
 576                 in_ifscrub(ifp, ia);
 577
 578                 /*
 579                  * in_ifadown gets rid of all the rest of
 580                  * the routes.  This is not quite the right
 581                  * thing to do, but at least if we are running
 582                  * a routing process they will come back.
 583                  */
 584                 in_ifadown(&ia->ia_ifa, 1);
 585                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 586                 error = 0;
 587                 break;
 588
 589         default:
 590                 panic("in_control: unsupported ioctl");
 591         }
 592
 593         IF_ADDR_LOCK(ifp);
 594         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 595         IF_ADDR_UNLOCK(ifp);
 596         ifa_free(&ia->ia_ifa);                          /* if_addrhead */
 597
 598         IN_IFADDR_WLOCK();
 599         TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
 600         if (ia->ia_addr.sin_family == AF_INET) {
 601                 struct in_ifaddr *if_ia;
 602
 603                 LIST_REMOVE(ia, ia_hash);
 604                 IN_IFADDR_WUNLOCK();
 605                 /*
 606                  * If this is the last IPv4 address configured on this
 607                  * interface, leave the all-hosts group.
 608                  * No state-change report need be transmitted.
 609                  */
 610                 if_ia = NULL;
 611                 IFP_TO_IA(ifp, if_ia);
 612                 if (if_ia == NULL) {
 613                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 614                         IN_MULTI_LOCK();
 615                         if (ii->ii_allhosts) {
 616                                 (void)in_leavegroup_locked(ii->ii_allhosts,
 617                                     NULL);
 618                                 ii->ii_allhosts = NULL;
 619                         }
 620                         IN_MULTI_UNLOCK();
 621                 } else
 622                         ifa_free(&if_ia->ia_ifa);
 623         } else
 624                 IN_IFADDR_WUNLOCK();
 625         ifa_free(&ia->ia_ifa);                          /* in_ifaddrhead */
 626 out:
 627         if (ia != NULL)
 628                 ifa_free(&ia->ia_ifa);
 629         return (error);
 630 }
 631
 632 /*
 633  * SIOC[GAD]LIFADDR.
 634  *      SIOCGLIFADDR: get first address. (?!?)
 635  *      SIOCGLIFADDR with IFLR_PREFIX:
 636  *              get first address that matches the specified prefix.
 637  *      SIOCALIFADDR: add the specified address.
 638  *      SIOCALIFADDR with IFLR_PREFIX:
 639  *              EINVAL since we can't deduce hostid part of the address.
 640  *      SIOCDLIFADDR: delete the specified address.
 641  *      SIOCDLIFADDR with IFLR_PREFIX:
 642  *              delete the first address that matches the specified prefix.
 643  * return values:
 644  *      EINVAL on invalid parameters
 645  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 646  *      other values may be returned from in_ioctl()
 647  */
 648 static int
 649 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 650     struct ifnet *ifp, struct thread *td)
 651 {
 652         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 653         struct ifaddr *ifa;
 654
 655         /* sanity checks */
 656         if (data == NULL || ifp == NULL) {
 657                 panic("invalid argument to in_lifaddr_ioctl");
 658                 /*NOTRECHED*/
 659         }
 660
 661         switch (cmd) {
 662         case SIOCGLIFADDR:
 663                 /* address must be specified on GET with IFLR_PREFIX */
 664                 if ((iflr->flags & IFLR_PREFIX) == 0)
 665                         break;
 666                 /*FALLTHROUGH*/
 667         case SIOCALIFADDR:
 668         case SIOCDLIFADDR:
 669                 /* address must be specified on ADD and DELETE */
 670                 if (iflr->addr.ss_family != AF_INET)
 671                         return (EINVAL);
 672                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 673                         return (EINVAL);
 674                 /* XXX need improvement */
 675                 if (iflr->dstaddr.ss_family
 676                  && iflr->dstaddr.ss_family != AF_INET)
 677                         return (EINVAL);
 678                 if (iflr->dstaddr.ss_family
 679                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 680                         return (EINVAL);
 681                 break;
 682         default: /*shouldn't happen*/
 683                 return (EOPNOTSUPP);
 684         }
 685         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 686                 return (EINVAL);
 687
 688         switch (cmd) {
 689         case SIOCALIFADDR:
 690             {
 691                 struct in_aliasreq ifra;
 692
 693                 if (iflr->flags & IFLR_PREFIX)
 694                         return (EINVAL);
 695
 696                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 697                 bzero(&ifra, sizeof(ifra));
 698                 bcopy(iflr->iflr_name, ifra.ifra_name,
 699                         sizeof(ifra.ifra_name));
 700
 701                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 702
 703                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 704                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 705                                 iflr->dstaddr.ss_len);
 706                 }
 707
 708                 ifra.ifra_mask.sin_family = AF_INET;
 709                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 710                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 711
 712                 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td));
 713             }
 714         case SIOCGLIFADDR:
 715         case SIOCDLIFADDR:
 716             {
 717                 struct in_ifaddr *ia;
 718                 struct in_addr mask, candidate, match;
 719                 struct sockaddr_in *sin;
 720
 721                 bzero(&mask, sizeof(mask));
 722                 bzero(&match, sizeof(match));
 723                 if (iflr->flags & IFLR_PREFIX) {
 724                         /* lookup a prefix rather than address. */
 725                         in_len2mask(&mask, iflr->prefixlen);
 726
 727                         sin = (struct sockaddr_in *)&iflr->addr;
 728                         match.s_addr = sin->sin_addr.s_addr;
 729                         match.s_addr &= mask.s_addr;
 730
 731                         /* if you set extra bits, that's wrong */
 732                         if (match.s_addr != sin->sin_addr.s_addr)
 733                                 return (EINVAL);
 734
 735                 } else {
 736                         /* on getting an address, take the 1st match */
 737                         /* on deleting an address, do exact match */
 738                         if (cmd != SIOCGLIFADDR) {
 739                                 in_len2mask(&mask, 32);
 740                                 sin = (struct sockaddr_in *)&iflr->addr;
 741                                 match.s_addr = sin->sin_addr.s_addr;
 742                         }
 743                 }
 744
 745                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 746                         if (ifa->ifa_addr->sa_family != AF_INET6)
 747                                 continue;
 748                         if (match.s_addr == 0)
 749                                 break;
 750                         candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 751                         candidate.s_addr &= mask.s_addr;
 752                         if (candidate.s_addr == match.s_addr)
 753                                 break;
 754                 }
 755                 if (ifa == NULL)
 756                         return (EADDRNOTAVAIL);
 757                 ia = (struct in_ifaddr *)ifa;
 758
 759                 if (cmd == SIOCGLIFADDR) {
 760                         /* fill in the if_laddrreq structure */
 761                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 762
 763                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 764                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 765                                         ia->ia_dstaddr.sin_len);
 766                         } else
 767                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 768
 769                         iflr->prefixlen =
 770                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 771
 772                         iflr->flags = 0;        /*XXX*/
 773
 774                         return (0);
 775                 } else {
 776                         struct in_aliasreq ifra;
 777
 778                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 779                         bzero(&ifra, sizeof(ifra));
 780                         bcopy(iflr->iflr_name, ifra.ifra_name,
 781                                 sizeof(ifra.ifra_name));
 782
 783                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 784                                 ia->ia_addr.sin_len);
 785                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 786                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 787                                         ia->ia_dstaddr.sin_len);
 788                         }
 789                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 790                                 ia->ia_sockmask.sin_len);
 791
 792                         return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
 793                             ifp, td));
 794                 }
 795             }
 796         }
 797
 798         return (EOPNOTSUPP);    /*just for safety*/
 799 }
 800
 801 /*
 802  * Delete any existing route for an interface.
 803  */
 804 void
 805 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
 806 {
 807
 808         in_scrubprefix(ia);
 809 }
 810
 811 /*
 812  * Initialize an interface's internet address
 813  * and routing table entry.
 814  */
 815 static int
 816 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
 817     int scrub)
 818 {
 819         register u_long i = ntohl(sin->sin_addr.s_addr);
 820         struct sockaddr_in oldaddr;
 821         struct rtentry *rt = NULL;
 822         struct rt_addrinfo info;
 823         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 824         int s = splimp(), flags = RTF_UP, error = 0;
 825
 826         oldaddr = ia->ia_addr;
 827         if (oldaddr.sin_family == AF_INET)
 828                 LIST_REMOVE(ia, ia_hash);
 829         ia->ia_addr = *sin;
 830         if (ia->ia_addr.sin_family == AF_INET) {
 831                 IN_IFADDR_WLOCK();
 832                 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 833                     ia, ia_hash);
 834                 IN_IFADDR_WUNLOCK();
 835         }
 836         /*
 837          * Give the interface a chance to initialize
 838          * if this is its first address,
 839          * and to validate the address if necessary.
 840          */
 841         if (ifp->if_ioctl != NULL) {
 842                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 843                 if (error) {
 844                         splx(s);
 845                         /* LIST_REMOVE(ia, ia_hash) is done in in_control */
 846                         ia->ia_addr = oldaddr;
 847                         IN_IFADDR_WLOCK();
 848                         if (ia->ia_addr.sin_family == AF_INET)
 849                                 LIST_INSERT_HEAD(INADDR_HASH(
 850                                     ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
 851                         else
 852                                 /*
 853                                  * If oldaddr family is not AF_INET (e.g.
 854                                  * interface has been just created) in_control
 855                                  * does not call LIST_REMOVE, and we end up
 856                                  * with bogus ia entries in hash
 857                                  */
 858                                 LIST_REMOVE(ia, ia_hash);
 859                         IN_IFADDR_WUNLOCK();
 860                         return (error);
 861                 }
 862         }
 863         splx(s);
 864         if (scrub) {
 865                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 866                 in_ifscrub(ifp, ia);
 867                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 868         }
 869         if (IN_CLASSA(i))
 870                 ia->ia_netmask = IN_CLASSA_NET;
 871         else if (IN_CLASSB(i))
 872                 ia->ia_netmask = IN_CLASSB_NET;
 873         else
 874                 ia->ia_netmask = IN_CLASSC_NET;
 875         /*
 876          * The subnet mask usually includes at least the standard network part,
 877          * but may may be smaller in the case of supernetting.
 878          * If it is set, we believe it.
 879          */
 880         if (ia->ia_subnetmask == 0) {
 881                 ia->ia_subnetmask = ia->ia_netmask;
 882                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
 883         } else
 884                 ia->ia_netmask &= ia->ia_subnetmask;
 885         ia->ia_net = i & ia->ia_netmask;
 886         ia->ia_subnet = i & ia->ia_subnetmask;
 887         in_socktrim(&ia->ia_sockmask);
 888 #ifdef DEV_CARP
 889         /*
 890          * XXX: carp(4) does not have interface route
 891          */
 892         if (ifp->if_type == IFT_CARP)
 893                 return (0);
 894 #endif
 895         /*
 896          * Add route for the network.
 897          */
 898         ia->ia_ifa.ifa_metric = ifp->if_metric;
 899         if (ifp->if_flags & IFF_BROADCAST) {
 900                 ia->ia_broadaddr.sin_addr.s_addr =
 901                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
 902                 ia->ia_netbroadcast.s_addr =
 903                         htonl(ia->ia_net | ~ ia->ia_netmask);
 904         } else if (ifp->if_flags & IFF_LOOPBACK) {
 905                 ia->ia_dstaddr = ia->ia_addr;
 906                 flags |= RTF_HOST;
 907         } else if (ifp->if_flags & IFF_POINTOPOINT) {
 908                 if (ia->ia_dstaddr.sin_family != AF_INET)
 909                         return (0);
 910                 flags |= RTF_HOST;
 911         }
 912         if ((error = in_addprefix(ia, flags)) != 0)
 913                 return (error);
 914
 915         if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
 916                 return (0);
 917
 918         /*
 919          * add a loopback route to self
 920          */
 921         if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) {
 922                 bzero(&info, sizeof(info));
 923                 info.rti_ifp = V_loif;
 924                 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC;
 925                 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr;
 926                 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
 927                 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0);
 928
 929                 if (error == 0 && rt != NULL) {
 930                         RT_LOCK(rt);
 931                         ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type  =
 932                                 rt->rt_ifp->if_type;
 933                         ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
 934                                 rt->rt_ifp->if_index;
 935                         RT_REMREF(rt);
 936                         RT_UNLOCK(rt);
 937                 } else if (error != 0)
 938                         log(LOG_INFO, "in_ifinit: insertion failed\n");
 939         }
 940
 941         return (error);
 942 }
 943
 944 #define rtinitflags(x) \
 945         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
 946             ? RTF_HOST : 0)
 947 /*
 948  * Check if we have a route for the given prefix already or add one accordingly.
 949  */
 950 static int
 951 in_addprefix(struct in_ifaddr *target, int flags)
 952 {
 953         struct in_ifaddr *ia;
 954         struct in_addr prefix, mask, p, m;
 955         int error;
 956
 957         if ((flags & RTF_HOST) != 0) {
 958                 prefix = target->ia_dstaddr.sin_addr;
 959                 mask.s_addr = 0;
 960         } else {
 961                 prefix = target->ia_addr.sin_addr;
 962                 mask = target->ia_sockmask.sin_addr;
 963                 prefix.s_addr &= mask.s_addr;
 964         }
 965
 966         IN_IFADDR_RLOCK();
 967         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 968                 if (rtinitflags(ia)) {
 969                         p = ia->ia_addr.sin_addr;
 970
 971                         if (prefix.s_addr != p.s_addr)
 972                                 continue;
 973                 } else {
 974                         p = ia->ia_addr.sin_addr;
 975                         m = ia->ia_sockmask.sin_addr;
 976                         p.s_addr &= m.s_addr;
 977
 978                         if (prefix.s_addr != p.s_addr ||
 979                             mask.s_addr != m.s_addr)
 980                                 continue;
 981                 }
 982
 983                 /*
 984                  * If we got a matching prefix route inserted by other
 985                  * interface address, we are done here.
 986                  */
 987                 if (ia->ia_flags & IFA_ROUTE) {
 988                         if (V_sameprefixcarponly &&
 989                             target->ia_ifp->if_type != IFT_CARP &&
 990                             ia->ia_ifp->if_type != IFT_CARP) {
 991                                 IN_IFADDR_RUNLOCK();
 992                                 return (EEXIST);
 993                         } else {
 994                                 IN_IFADDR_RUNLOCK();
 995                                 return (0);
 996                         }
 997                 }
 998         }
 999         IN_IFADDR_RUNLOCK();
1000
1001         /*
1002          * No-one seem to have this prefix route, so we try to insert it.
1003          */
1004         error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
1005         if (!error)
1006                 target->ia_flags |= IFA_ROUTE;
1007         return (error);
1008 }
1009
1010 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
1011
1012 /*
1013  * If there is no other address in the system that can serve a route to the
1014  * same prefix, remove the route.  Hand over the route to the new address
1015  * otherwise.
1016  */
1017 static int
1018 in_scrubprefix(struct in_ifaddr *target)
1019 {
1020         struct in_ifaddr *ia;
1021         struct in_addr prefix, mask, p;
1022         int error;
1023         struct sockaddr_in prefix0, mask0;
1024         struct rt_addrinfo info;
1025         struct sockaddr_dl null_sdl;
1026
1027         if ((target->ia_flags & IFA_ROUTE) == 0)
1028                 return (0);
1029
1030         /*
1031          * Remove the loopback route to the interface address.
1032          * The "useloopback" setting is not consulted because if the
1033          * user configures an interface address, turns off this
1034          * setting, and then tries to delete that interface address,
1035          * checking the current setting of "useloopback" would leave
1036          * that interface address loopback route untouched, which
1037          * would be wrong. Therefore the interface address loopback route
1038          * deletion is unconditional.
1039          */
1040         if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
1041             !(target->ia_ifp->if_flags & IFF_LOOPBACK)) {
1042                 bzero(&null_sdl, sizeof(null_sdl));
1043                 null_sdl.sdl_len = sizeof(null_sdl);
1044                 null_sdl.sdl_family = AF_LINK;
1045                 null_sdl.sdl_type = V_loif->if_type;
1046                 null_sdl.sdl_index = V_loif->if_index;
1047                 bzero(&info, sizeof(info));
1048                 info.rti_flags = target->ia_flags | RTF_HOST | RTF_STATIC;
1049                 info.rti_info[RTAX_DST] = (struct sockaddr *)&target->ia_addr;
1050                 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1051                 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0);
1052
1053                 if (error != 0)
1054                         log(LOG_INFO, "in_scrubprefix: deletion failed\n");
1055         }
1056
1057         if (rtinitflags(target))
1058                 prefix = target->ia_dstaddr.sin_addr;
1059         else {
1060                 prefix = target->ia_addr.sin_addr;
1061                 mask = target->ia_sockmask.sin_addr;
1062                 prefix.s_addr &= mask.s_addr;
1063                 /* remove arp cache */
1064                 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
1065         }
1066
1067         IN_IFADDR_RLOCK();
1068         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1069                 if (rtinitflags(ia))
1070                         p = ia->ia_dstaddr.sin_addr;
1071                 else {
1072                         p = ia->ia_addr.sin_addr;
1073                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1074                 }
1075
1076                 if (prefix.s_addr != p.s_addr)
1077                         continue;
1078
1079                 /*
1080                  * If we got a matching prefix address, move IFA_ROUTE and
1081                  * the route itself to it.  Make sure that routing daemons
1082                  * get a heads-up.
1083                  *
1084                  * XXX: a special case for carp(4) interface
1085                  */
1086                 if ((ia->ia_flags & IFA_ROUTE) == 0
1087 #ifdef DEV_CARP
1088                     && (ia->ia_ifp->if_type != IFT_CARP)
1089 #endif
1090                                                         ) {
1091                         IN_IFADDR_RUNLOCK();
1092                         rtinit(&(target->ia_ifa), (int)RTM_DELETE,
1093                             rtinitflags(target));
1094                         target->ia_flags &= ~IFA_ROUTE;
1095
1096                         error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
1097                             rtinitflags(ia) | RTF_UP);
1098                         if (error == 0)
1099                                 ia->ia_flags |= IFA_ROUTE;
1100                         return (error);
1101                 }
1102         }
1103         IN_IFADDR_RUNLOCK();
1104
1105         /*
1106          * remove all L2 entries on the given prefix
1107          */
1108         bzero(&prefix0, sizeof(prefix0));
1109         prefix0.sin_len = sizeof(prefix0);
1110         prefix0.sin_family = AF_INET;
1111         prefix0.sin_addr.s_addr = target->ia_subnet;
1112         bzero(&mask0, sizeof(mask0));
1113         mask0.sin_len = sizeof(mask0);
1114         mask0.sin_family = AF_INET;
1115         mask0.sin_addr.s_addr = target->ia_subnetmask;
1116         lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
1117                             (struct sockaddr *)&mask0);
1118
1119         /*
1120          * As no-one seem to have this prefix, we can remove the route.
1121          */
1122         rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
1123         target->ia_flags &= ~IFA_ROUTE;
1124         return (0);
1125 }
1126
1127 #undef rtinitflags
1128
1129 /*
1130  * Return 1 if the address might be a local broadcast address.
1131  */
1132 int
1133 in_broadcast(struct in_addr in, struct ifnet *ifp)
1134 {
1135         register struct ifaddr *ifa;
1136         u_long t;
1137
1138         if (in.s_addr == INADDR_BROADCAST ||
1139             in.s_addr == INADDR_ANY)
1140                 return (1);
1141         if ((ifp->if_flags & IFF_BROADCAST) == 0)
1142                 return (0);
1143         t = ntohl(in.s_addr);
1144         /*
1145          * Look through the list of addresses for a match
1146          * with a broadcast address.
1147          */
1148 #define ia ((struct in_ifaddr *)ifa)
1149         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1150                 if (ifa->ifa_addr->sa_family == AF_INET &&
1151                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1152                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1153                      /*
1154                       * Check for old-style (host 0) broadcast.
1155                       */
1156                      t == ia->ia_subnet || t == ia->ia_net) &&
1157                      /*
1158                       * Check for an all one subnetmask. These
1159                       * only exist when an interface gets a secondary
1160                       * address.
1161                       */
1162                      ia->ia_subnetmask != (u_long)0xffffffff)
1163                             return (1);
1164         return (0);
1165 #undef ia
1166 }
1167
1168 /*
1169  * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1170  */
1171 void
1172 in_ifdetach(struct ifnet *ifp)
1173 {
1174
1175         in_pcbpurgeif0(&V_ripcbinfo, ifp);
1176         in_pcbpurgeif0(&V_udbinfo, ifp);
1177         in_purgemaddrs(ifp);
1178 }
1179
1180 /*
1181  * Delete all IPv4 multicast address records, and associated link-layer
1182  * multicast address records, associated with ifp.
1183  * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1184  * XXX This should not race with ifma_protospec being set during
1185  * a new allocation, if it does, we have bigger problems.
1186  */
1187 static void
1188 in_purgemaddrs(struct ifnet *ifp)
1189 {
1190         LIST_HEAD(,in_multi) purgeinms;
1191         struct in_multi         *inm, *tinm;
1192         struct ifmultiaddr      *ifma;
1193
1194         LIST_INIT(&purgeinms);
1195         IN_MULTI_LOCK();
1196
1197         /*
1198          * Extract list of in_multi associated with the detaching ifp
1199          * which the PF_INET layer is about to release.
1200          * We need to do this as IF_ADDR_LOCK() may be re-acquired
1201          * by code further down.
1202          */
1203         IF_ADDR_LOCK(ifp);
1204         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1205                 if (ifma->ifma_addr->sa_family != AF_INET ||
1206                     ifma->ifma_protospec == NULL)
1207                         continue;
1208 #if 0
1209                 KASSERT(ifma->ifma_protospec != NULL,
1210                     ("%s: ifma_protospec is NULL", __func__));
1211 #endif
1212                 inm = (struct in_multi *)ifma->ifma_protospec;
1213                 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
1214         }
1215         IF_ADDR_UNLOCK(ifp);
1216
1217         LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
1218                 LIST_REMOVE(inm, inm_link);
1219                 inm_release_locked(inm);
1220         }
1221         igmp_ifdetach(ifp);
1222
1223         IN_MULTI_UNLOCK();
1224 }
1225
1226 #include <net/if_dl.h>
1227 #include <netinet/if_ether.h>
1228
1229 struct in_llentry {
1230         struct llentry          base;
1231         struct sockaddr_in      l3_addr4;
1232 };
1233
1234 static struct llentry *
1235 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
1236 {
1237         struct in_llentry *lle;
1238
1239         lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO);
1240         if (lle == NULL)                /* NB: caller generates msg */
1241                 return NULL;
1242
1243         callout_init(&lle->base.la_timer, CALLOUT_MPSAFE);
1244         /*
1245          * For IPv4 this will trigger "arpresolve" to generate
1246          * an ARP request.
1247          */
1248         lle->base.la_expire = time_second; /* mark expired */
1249         lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
1250         lle->base.lle_refcnt = 1;
1251         LLE_LOCK_INIT(&lle->base);
1252         return &lle->base;
1253 }
1254
1255 /*
1256  * Deletes an address from the address table.
1257  * This function is called by the timer functions
1258  * such as arptimer() and nd6_llinfo_timer(), and
1259  * the caller does the locking.
1260  */
1261 static void
1262 in_lltable_free(struct lltable *llt, struct llentry *lle)
1263 {
1264         LLE_WUNLOCK(lle);
1265         LLE_LOCK_DESTROY(lle);
1266         free(lle, M_LLTABLE);
1267 }
1268
1269
1270 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)       (                       \
1271             (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
1272
1273 static void
1274 in_lltable_prefix_free(struct lltable *llt,
1275                        const struct sockaddr *prefix,
1276                        const struct sockaddr *mask)
1277 {
1278         const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
1279         const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
1280         struct llentry *lle, *next;
1281         register int i;
1282
1283         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
1284                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
1285
1286                         if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle),
1287                                                      pfx, msk)) {
1288                                 callout_drain(&lle->la_timer);
1289                                 LLE_WLOCK(lle);
1290                                 llentry_free(lle);
1291                         }
1292                 }
1293         }
1294 }
1295
1296
1297 static int
1298 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr)
1299 {
1300         struct rtentry *rt;
1301
1302         KASSERT(l3addr->sa_family == AF_INET,
1303             ("sin_family %d", l3addr->sa_family));
1304
1305         /* XXX rtalloc1 should take a const param */
1306         rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
1307         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
1308                 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1309                     inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1310                 if (rt != NULL)
1311                         RTFREE_LOCKED(rt);
1312                 return (EINVAL);
1313         }
1314         RTFREE_LOCKED(rt);
1315         return 0;
1316 }
1317
1318 /*
1319  * Return NULL if not found or marked for deletion.
1320  * If found return lle read locked.
1321  */
1322 static struct llentry *
1323 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1324 {
1325         const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1326         struct ifnet *ifp = llt->llt_ifp;
1327         struct llentry *lle;
1328         struct llentries *lleh;
1329         u_int hashkey;
1330
1331         IF_AFDATA_LOCK_ASSERT(ifp);
1332         KASSERT(l3addr->sa_family == AF_INET,
1333             ("sin_family %d", l3addr->sa_family));
1334
1335         hashkey = sin->sin_addr.s_addr;
1336         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
1337         LIST_FOREACH(lle, lleh, lle_next) {
1338                 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle);
1339                 if (lle->la_flags & LLE_DELETED)
1340                         continue;
1341                 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
1342                         break;
1343         }
1344         if (lle == NULL) {
1345 #ifdef DIAGNOSTICS
1346                 if (flags & LLE_DELETE)
1347                         log(LOG_INFO, "interface address is missing from cache = %p  in delete\n", lle);
1348 #endif
1349                 if (!(flags & LLE_CREATE))
1350                         return (NULL);
1351                 /*
1352                  * A route that covers the given address must have
1353                  * been installed 1st because we are doing a resolution,
1354                  * verify this.
1355                  */
1356                 if (!(flags & LLE_IFADDR) &&
1357                     in_lltable_rtcheck(ifp, l3addr) != 0)
1358                         goto done;
1359
1360                 lle = in_lltable_new(l3addr, flags);
1361                 if (lle == NULL) {
1362                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1363                         goto done;
1364                 }
1365                 lle->la_flags = flags & ~LLE_CREATE;
1366                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
1367                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
1368                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
1369                 }
1370
1371                 lle->lle_tbl  = llt;
1372                 lle->lle_head = lleh;
1373                 LIST_INSERT_HEAD(lleh, lle, lle_next);
1374         } else if (flags & LLE_DELETE) {
1375                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
1376                         LLE_WLOCK(lle);
1377                         lle->la_flags = LLE_DELETED;
1378                         LLE_WUNLOCK(lle);
1379 #ifdef DIAGNOSTICS
1380                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);
1381 #endif
1382                 }
1383                 lle = (void *)-1;
1384
1385         }
1386         if (LLE_IS_VALID(lle)) {
1387                 if (flags & LLE_EXCLUSIVE)
1388                         LLE_WLOCK(lle);
1389                 else
1390                         LLE_RLOCK(lle);
1391         }
1392 done:
1393         return (lle);
1394 }
1395
1396 static int
1397 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
1398 {
1399 #define SIN(lle)        ((struct sockaddr_in *) L3_ADDR(lle))
1400         struct ifnet *ifp = llt->llt_ifp;
1401         struct llentry *lle;
1402         /* XXX stack use */
1403         struct {
1404                 struct rt_msghdr        rtm;
1405                 struct sockaddr_inarp   sin;
1406                 struct sockaddr_dl      sdl;
1407         } arpc;
1408         int error, i;
1409
1410         /* XXXXX
1411          * current IFNET_RLOCK() is mapped to IFNET_WLOCK()
1412          * so it is okay to use this ASSERT, change it when
1413          * IFNET lock is finalized
1414          */
1415         IFNET_WLOCK_ASSERT();
1416
1417         error = 0;
1418         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
1419                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
1420                         struct sockaddr_dl *sdl;
1421
1422                         /* skip deleted entries */
1423                         if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
1424                                 continue;
1425                         /* Skip if jailed and not a valid IP of the prison. */
1426                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
1427                                 continue;
1428                         /*
1429                          * produce a msg made of:
1430                          *  struct rt_msghdr;
1431                          *  struct sockaddr_inarp; (IPv4)
1432                          *  struct sockaddr_dl;
1433                          */
1434                         bzero(&arpc, sizeof(arpc));
1435                         arpc.rtm.rtm_msglen = sizeof(arpc);
1436                         arpc.rtm.rtm_version = RTM_VERSION;
1437                         arpc.rtm.rtm_type = RTM_GET;
1438                         arpc.rtm.rtm_flags = RTF_UP;
1439                         arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1440                         arpc.sin.sin_family = AF_INET;
1441                         arpc.sin.sin_len = sizeof(arpc.sin);
1442                         arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
1443
1444                         /* publish */
1445                         if (lle->la_flags & LLE_PUB) {
1446                                 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1447                                 /* proxy only */
1448                                 if (lle->la_flags & LLE_PROXY)
1449                                         arpc.sin.sin_other = SIN_PROXY;
1450                         }
1451
1452                         sdl = &arpc.sdl;
1453                         sdl->sdl_family = AF_LINK;
1454                         sdl->sdl_len = sizeof(*sdl);
1455                         sdl->sdl_alen = ifp->if_addrlen;
1456                         sdl->sdl_index = ifp->if_index;
1457                         sdl->sdl_type = ifp->if_type;
1458                         bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1459
1460                         arpc.rtm.rtm_rmx.rmx_expire =
1461                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1462                         arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1463                         if (lle->la_flags & LLE_STATIC)
1464                                 arpc.rtm.rtm_flags |= RTF_STATIC;
1465                         arpc.rtm.rtm_index = ifp->if_index;
1466                         error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1467                         if (error)
1468                                 break;
1469                 }
1470         }
1471         return error;
1472 #undef SIN
1473 }
1474
1475 void *
1476 in_domifattach(struct ifnet *ifp)
1477 {
1478         struct in_ifinfo *ii;
1479         struct lltable *llt;
1480
1481         ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1482
1483         llt = lltable_init(ifp, AF_INET);
1484         if (llt != NULL) {
1485                 llt->llt_new = in_lltable_new;
1486                 llt->llt_free = in_lltable_free;
1487                 llt->llt_prefix_free = in_lltable_prefix_free;
1488                 llt->llt_rtcheck = in_lltable_rtcheck;
1489                 llt->llt_lookup = in_lltable_lookup;
1490                 llt->llt_dump = in_lltable_dump;
1491         }
1492         ii->ii_llt = llt;
1493
1494         ii->ii_igmp = igmp_domifattach(ifp);
1495
1496         return ii;
1497 }
1498
1499 void
1500 in_domifdetach(struct ifnet *ifp, void *aux)
1501 {
1502         struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1503
1504         igmp_domifdetach(ifp);
1505         lltable_free(ii->ii_llt);
1506         free(ii, M_IFADDR);
1507 }