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 #include "opt_mpath.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/sockio.h>
  42 #include <sys/malloc.h>
  43 #include <sys/priv.h>
  44 #include <sys/socket.h>
  45 #include <sys/jail.h>
  46 #include <sys/kernel.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/syslog.h>
  50
  51 #include <net/if.h>
  52 #include <net/if_var.h>
  53 #include <net/if_dl.h>
  54 #include <net/if_llatbl.h>
  55 #include <net/if_types.h>
  56 #include <net/route.h>
  57 #include <net/vnet.h>
  58
  59 #include <netinet/in.h>
  60 #include <netinet/in_var.h>
  61 #include <netinet/in_pcb.h>
  62 #include <netinet/ip_var.h>
  63 #include <netinet/igmp_var.h>
  64 #include <netinet/udp.h>
  65 #include <netinet/udp_var.h>
  66
  67 static int in_mask2len(struct in_addr *);
  68 static void in_len2mask(struct in_addr *, int);
  69 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
  70         struct ifnet *, struct thread *);
  71
  72 static int      in_addprefix(struct in_ifaddr *, int);
  73 static int      in_scrubprefix(struct in_ifaddr *);
  74 static void     in_socktrim(struct sockaddr_in *);
  75 static int      in_ifinit(struct ifnet *,
  76             struct in_ifaddr *, struct sockaddr_in *, int);
  77 static void     in_purgemaddrs(struct ifnet *);
  78
  79 static VNET_DEFINE(int, subnetsarelocal);
  80 static VNET_DEFINE(int, sameprefixcarponly);
  81 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
  82
  83 #define V_subnetsarelocal               VNET(subnetsarelocal)
  84 #define V_sameprefixcarponly            VNET(sameprefixcarponly)
  85 #define V_ripcbinfo                     VNET(ripcbinfo)
  86
  87 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  88         &VNET_NAME(subnetsarelocal), 0,
  89         "Treat all subnets as directly connected");
  90 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
  91         &VNET_NAME(sameprefixcarponly), 0,
  92         "Refuse to create same prefixes on different interfaces");
  93
  94 /*
  95  * Return 1 if an internet address is for a ``local'' host
  96  * (one to which we have a connection).  If subnetsarelocal
  97  * is true, this includes other subnets of the local net.
  98  * Otherwise, it includes only the directly-connected (sub)nets.
  99  */
 100 int
 101 in_localaddr(struct in_addr in)
 102 {
 103         register u_long i = ntohl(in.s_addr);
 104         register struct in_ifaddr *ia;
 105
 106         IN_IFADDR_RLOCK();
 107         if (V_subnetsarelocal) {
 108                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 109                         if ((i & ia->ia_netmask) == ia->ia_net) {
 110                                 IN_IFADDR_RUNLOCK();
 111                                 return (1);
 112                         }
 113                 }
 114         } else {
 115                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 116                         if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
 117                                 IN_IFADDR_RUNLOCK();
 118                                 return (1);
 119                         }
 120                 }
 121         }
 122         IN_IFADDR_RUNLOCK();
 123         return (0);
 124 }
 125
 126 /*
 127  * Return 1 if an internet address is for the local host and configured
 128  * on one of its interfaces.
 129  */
 130 int
 131 in_localip(struct in_addr in)
 132 {
 133         struct in_ifaddr *ia;
 134
 135         IN_IFADDR_RLOCK();
 136         LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
 137                 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
 138                         IN_IFADDR_RUNLOCK();
 139                         return (1);
 140                 }
 141         }
 142         IN_IFADDR_RUNLOCK();
 143         return (0);
 144 }
 145
 146 /*
 147  * Determine whether an IP address is in a reserved set of addresses
 148  * that may not be forwarded, or whether datagrams to that destination
 149  * may be forwarded.
 150  */
 151 int
 152 in_canforward(struct in_addr in)
 153 {
 154         register u_long i = ntohl(in.s_addr);
 155         register u_long net;
 156
 157         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
 158                 return (0);
 159         if (IN_CLASSA(i)) {
 160                 net = i & IN_CLASSA_NET;
 161                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 162                         return (0);
 163         }
 164         return (1);
 165 }
 166
 167 /*
 168  * Trim a mask in a sockaddr
 169  */
 170 static void
 171 in_socktrim(struct sockaddr_in *ap)
 172 {
 173     register char *cplim = (char *) &ap->sin_addr;
 174     register char *cp = (char *) (&ap->sin_addr + 1);
 175
 176     ap->sin_len = 0;
 177     while (--cp >= cplim)
 178         if (*cp) {
 179             (ap)->sin_len = cp - (char *) (ap) + 1;
 180             break;
 181         }
 182 }
 183
 184 static int
 185 in_mask2len(mask)
 186         struct in_addr *mask;
 187 {
 188         int x, y;
 189         u_char *p;
 190
 191         p = (u_char *)mask;
 192         for (x = 0; x < sizeof(*mask); x++) {
 193                 if (p[x] != 0xff)
 194                         break;
 195         }
 196         y = 0;
 197         if (x < sizeof(*mask)) {
 198                 for (y = 0; y < 8; y++) {
 199                         if ((p[x] & (0x80 >> y)) == 0)
 200                                 break;
 201                 }
 202         }
 203         return (x * 8 + y);
 204 }
 205
 206 static void
 207 in_len2mask(struct in_addr *mask, int len)
 208 {
 209         int i;
 210         u_char *p;
 211
 212         p = (u_char *)mask;
 213         bzero(mask, sizeof(*mask));
 214         for (i = 0; i < len / 8; i++)
 215                 p[i] = 0xff;
 216         if (len % 8)
 217                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 218 }
 219
 220 /*
 221  * Generic internet control operations (ioctl's).
 222  *
 223  * ifp is NULL if not an interface-specific ioctl.
 224  */
 225 /* ARGSUSED */
 226 int
 227 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 228     struct thread *td)
 229 {
 230         register struct ifreq *ifr = (struct ifreq *)data;
 231         register struct in_ifaddr *ia, *iap;
 232         register struct ifaddr *ifa;
 233         struct in_addr allhosts_addr;
 234         struct in_addr dst;
 235         struct in_ifinfo *ii;
 236         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 237         struct sockaddr_in oldaddr;
 238         int error, hostIsNew, iaIsNew, maskIsNew;
 239         int iaIsFirst;
 240
 241         ia = NULL;
 242         iaIsFirst = 0;
 243         iaIsNew = 0;
 244         allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
 245
 246         /*
 247          * Filter out ioctls we implement directly; forward the rest on to
 248          * in_lifaddr_ioctl() and ifp->if_ioctl().
 249          */
 250         switch (cmd) {
 251         case SIOCAIFADDR:
 252         case SIOCDIFADDR:
 253         case SIOCGIFADDR:
 254         case SIOCGIFBRDADDR:
 255         case SIOCGIFDSTADDR:
 256         case SIOCGIFNETMASK:
 257         case SIOCSIFADDR:
 258         case SIOCSIFBRDADDR:
 259         case SIOCSIFDSTADDR:
 260         case SIOCSIFNETMASK:
 261                 break;
 262
 263         case SIOCALIFADDR:
 264                 if (td != NULL) {
 265                         error = priv_check(td, PRIV_NET_ADDIFADDR);
 266                         if (error)
 267                                 return (error);
 268                 }
 269                 if (ifp == NULL)
 270                         return (EINVAL);
 271                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 272
 273         case SIOCDLIFADDR:
 274                 if (td != NULL) {
 275                         error = priv_check(td, PRIV_NET_DELIFADDR);
 276                         if (error)
 277                                 return (error);
 278                 }
 279                 if (ifp == NULL)
 280                         return (EINVAL);
 281                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 282
 283         case SIOCGLIFADDR:
 284                 if (ifp == NULL)
 285                         return (EINVAL);
 286                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 287
 288         default:
 289                 if (ifp == NULL || ifp->if_ioctl == NULL)
 290                         return (EOPNOTSUPP);
 291                 return ((*ifp->if_ioctl)(ifp, cmd, data));
 292         }
 293
 294         if (ifp == NULL)
 295                 return (EADDRNOTAVAIL);
 296
 297         /*
 298          * Security checks before we get involved in any work.
 299          */
 300         switch (cmd) {
 301         case SIOCAIFADDR:
 302         case SIOCSIFADDR:
 303         case SIOCSIFBRDADDR:
 304         case SIOCSIFNETMASK:
 305         case SIOCSIFDSTADDR:
 306                 if (td != NULL) {
 307                         error = priv_check(td, PRIV_NET_ADDIFADDR);
 308                         if (error)
 309                                 return (error);
 310                 }
 311                 break;
 312
 313         case SIOCDIFADDR:
 314                 if (td != NULL) {
 315                         error = priv_check(td, PRIV_NET_DELIFADDR);
 316                         if (error)
 317                                 return (error);
 318                 }
 319                 break;
 320         }
 321
 322         /*
 323          * Find address for this interface, if it exists.
 324          *
 325          * If an alias address was specified, find that one instead of the
 326          * first one on the interface, if possible.
 327          */
 328         dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 329         IN_IFADDR_RLOCK();
 330         LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) {
 331                 if (iap->ia_ifp == ifp &&
 332                     iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 333                         if (td == NULL || prison_check_ip4(td->td_ucred,
 334                             &dst) == 0)
 335                                 ia = iap;
 336                         break;
 337                 }
 338         }
 339         if (ia != NULL)
 340                 ifa_ref(&ia->ia_ifa);
 341         IN_IFADDR_RUNLOCK();
 342         if (ia == NULL) {
 343                 IF_ADDR_LOCK(ifp);
 344                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 345                         iap = ifatoia(ifa);
 346                         if (iap->ia_addr.sin_family == AF_INET) {
 347                                 if (td != NULL &&
 348                                     prison_check_ip4(td->td_ucred,
 349                                     &iap->ia_addr.sin_addr) != 0)
 350                                         continue;
 351                                 ia = iap;
 352                                 break;
 353                         }
 354                 }
 355                 if (ia != NULL)
 356                         ifa_ref(&ia->ia_ifa);
 357                 IF_ADDR_UNLOCK(ifp);
 358         }
 359         if (ia == NULL)
 360                 iaIsFirst = 1;
 361
 362         error = 0;
 363         switch (cmd) {
 364         case SIOCAIFADDR:
 365         case SIOCDIFADDR:
 366                 if (ifra->ifra_addr.sin_family == AF_INET) {
 367                         struct in_ifaddr *oia;
 368
 369                         IN_IFADDR_RLOCK();
 370                         for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
 371                                 if (ia->ia_ifp == ifp  &&
 372                                     ia->ia_addr.sin_addr.s_addr ==
 373                                     ifra->ifra_addr.sin_addr.s_addr)
 374                                         break;
 375                         }
 376                         if (ia != NULL && ia != oia)
 377                                 ifa_ref(&ia->ia_ifa);
 378                         if (oia != NULL && ia != oia)
 379                                 ifa_free(&oia->ia_ifa);
 380                         IN_IFADDR_RUNLOCK();
 381                         if ((ifp->if_flags & IFF_POINTOPOINT)
 382                             && (cmd == SIOCAIFADDR)
 383                             && (ifra->ifra_dstaddr.sin_addr.s_addr
 384                                 == INADDR_ANY)) {
 385                                 error = EDESTADDRREQ;
 386                                 goto out;
 387                         }
 388                 }
 389                 if (cmd == SIOCDIFADDR && ia == NULL) {
 390                         error = EADDRNOTAVAIL;
 391                         goto out;
 392                 }
 393                 /* FALLTHROUGH */
 394         case SIOCSIFADDR:
 395         case SIOCSIFNETMASK:
 396         case SIOCSIFDSTADDR:
 397                 if (ia == NULL) {
 398                         ia = (struct in_ifaddr *)
 399                                 malloc(sizeof *ia, M_IFADDR, M_NOWAIT |
 400                                     M_ZERO);
 401                         if (ia == NULL) {
 402                                 error = ENOBUFS;
 403                                 goto out;
 404                         }
 405
 406                         ifa = &ia->ia_ifa;
 407                         ifa_init(ifa);
 408                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 409                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 410                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 411
 412                         ia->ia_sockmask.sin_len = 8;
 413                         ia->ia_sockmask.sin_family = AF_INET;
 414                         if (ifp->if_flags & IFF_BROADCAST) {
 415                                 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
 416                                 ia->ia_broadaddr.sin_family = AF_INET;
 417                         }
 418                         ia->ia_ifp = ifp;
 419
 420                         ifa_ref(ifa);                   /* if_addrhead */
 421                         IF_ADDR_LOCK(ifp);
 422                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 423                         IF_ADDR_UNLOCK(ifp);
 424                         ifa_ref(ifa);                   /* in_ifaddrhead */
 425                         IN_IFADDR_WLOCK();
 426                         TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
 427                         IN_IFADDR_WUNLOCK();
 428                         iaIsNew = 1;
 429                 }
 430                 break;
 431
 432         case SIOCSIFBRDADDR:
 433         case SIOCGIFADDR:
 434         case SIOCGIFNETMASK:
 435         case SIOCGIFDSTADDR:
 436         case SIOCGIFBRDADDR:
 437                 if (ia == NULL) {
 438                         error = EADDRNOTAVAIL;
 439                         goto out;
 440                 }
 441                 break;
 442         }
 443
 444         /*
 445          * Most paths in this switch return directly or via out.  Only paths
 446          * that remove the address break in order to hit common removal code.
 447          */
 448         switch (cmd) {
 449         case SIOCGIFADDR:
 450                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 451                 goto out;
 452
 453         case SIOCGIFBRDADDR:
 454                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 455                         error = EINVAL;
 456                         goto out;
 457                 }
 458                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 459                 goto out;
 460
 461         case SIOCGIFDSTADDR:
 462                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
 463                         error = EINVAL;
 464                         goto out;
 465                 }
 466                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 467                 goto out;
 468
 469         case SIOCGIFNETMASK:
 470                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 471                 goto out;
 472
 473         case SIOCSIFDSTADDR:
 474                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
 475                         error = EINVAL;
 476                         goto out;
 477                 }
 478                 oldaddr = ia->ia_dstaddr;
 479                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 480                 if (ifp->if_ioctl != NULL) {
 481                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
 482                             (caddr_t)ia);
 483                         if (error) {
 484                                 ia->ia_dstaddr = oldaddr;
 485                                 goto out;
 486                         }
 487                 }
 488                 if (ia->ia_flags & IFA_ROUTE) {
 489                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 490                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 491                         ia->ia_ifa.ifa_dstaddr =
 492                                         (struct sockaddr *)&ia->ia_dstaddr;
 493                         rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 494                 }
 495                 goto out;
 496
 497         case SIOCSIFBRDADDR:
 498                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 499                         error = EINVAL;
 500                         goto out;
 501                 }
 502                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 503                 goto out;
 504
 505         case SIOCSIFADDR:
 506                 error = in_ifinit(ifp, ia,
 507                     (struct sockaddr_in *) &ifr->ifr_addr, 1);
 508                 if (error != 0 && iaIsNew)
 509                         break;
 510                 if (error == 0) {
 511                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 512                         if (iaIsFirst &&
 513                             (ifp->if_flags & IFF_MULTICAST) != 0) {
 514                                 error = in_joingroup(ifp, &allhosts_addr,
 515                                     NULL, &ii->ii_allhosts);
 516                         }
 517                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 518                 }
 519                 error = 0;
 520                 goto out;
 521
 522         case SIOCSIFNETMASK:
 523                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 524                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 525                 goto out;
 526
 527         case SIOCAIFADDR:
 528                 maskIsNew = 0;
 529                 hostIsNew = 1;
 530                 error = 0;
 531                 if (ia->ia_addr.sin_family == AF_INET) {
 532                         if (ifra->ifra_addr.sin_len == 0) {
 533                                 ifra->ifra_addr = ia->ia_addr;
 534                                 hostIsNew = 0;
 535                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 536                                                ia->ia_addr.sin_addr.s_addr)
 537                                 hostIsNew = 0;
 538                 }
 539                 if (ifra->ifra_mask.sin_len) {
 540                         /*
 541                          * QL: XXX
 542                          * Need to scrub the prefix here in case
 543                          * the issued command is SIOCAIFADDR with
 544                          * the same address, but with a different
 545                          * prefix length. And if the prefix length
 546                          * is the same as before, then the call is
 547                          * un-necessarily executed here.
 548                          */
 549                         in_ifscrub(ifp, ia);
 550                         ia->ia_sockmask = ifra->ifra_mask;
 551                         ia->ia_sockmask.sin_family = AF_INET;
 552                         ia->ia_subnetmask =
 553                              ntohl(ia->ia_sockmask.sin_addr.s_addr);
 554                         maskIsNew = 1;
 555                 }
 556                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 557                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
 558                         in_ifscrub(ifp, ia);
 559                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 560                         maskIsNew  = 1; /* We lie; but the effect's the same */
 561                 }
 562                 if (ifra->ifra_addr.sin_family == AF_INET &&
 563                     (hostIsNew || maskIsNew))
 564                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 565                 if (error != 0 && iaIsNew)
 566                         goto out;
 567
 568                 if ((ifp->if_flags & IFF_BROADCAST) &&
 569                     (ifra->ifra_broadaddr.sin_family == AF_INET))
 570                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 571                 if (error == 0) {
 572                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 573                         if (iaIsFirst &&
 574                             (ifp->if_flags & IFF_MULTICAST) != 0) {
 575                                 error = in_joingroup(ifp, &allhosts_addr,
 576                                     NULL, &ii->ii_allhosts);
 577                         }
 578                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 579                 }
 580                 goto out;
 581
 582         case SIOCDIFADDR:
 583                 /*
 584                  * in_ifscrub kills the interface route.
 585                  */
 586                 in_ifscrub(ifp, ia);
 587
 588                 /*
 589                  * in_ifadown gets rid of all the rest of
 590                  * the routes.  This is not quite the right
 591                  * thing to do, but at least if we are running
 592                  * a routing process they will come back.
 593                  */
 594                 in_ifadown(&ia->ia_ifa, 1);
 595                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 596                 error = 0;
 597                 break;
 598
 599         default:
 600                 panic("in_control: unsupported ioctl");
 601         }
 602
 603         IF_ADDR_LOCK(ifp);
 604         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 605         IF_ADDR_UNLOCK(ifp);
 606         ifa_free(&ia->ia_ifa);                          /* if_addrhead */
 607
 608         IN_IFADDR_WLOCK();
 609         TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
 610         if (ia->ia_addr.sin_family == AF_INET) {
 611                 struct in_ifaddr *if_ia;
 612
 613                 LIST_REMOVE(ia, ia_hash);
 614                 IN_IFADDR_WUNLOCK();
 615                 /*
 616                  * If this is the last IPv4 address configured on this
 617                  * interface, leave the all-hosts group.
 618                  * No state-change report need be transmitted.
 619                  */
 620                 if_ia = NULL;
 621                 IFP_TO_IA(ifp, if_ia);
 622                 if (if_ia == NULL) {
 623                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
 624                         IN_MULTI_LOCK();
 625                         if (ii->ii_allhosts) {
 626                                 (void)in_leavegroup_locked(ii->ii_allhosts,
 627                                     NULL);
 628                                 ii->ii_allhosts = NULL;
 629                         }
 630                         IN_MULTI_UNLOCK();
 631                 } else
 632                         ifa_free(&if_ia->ia_ifa);
 633         } else
 634                 IN_IFADDR_WUNLOCK();
 635         ifa_free(&ia->ia_ifa);                          /* in_ifaddrhead */
 636 out:
 637         if (ia != NULL)
 638                 ifa_free(&ia->ia_ifa);
 639         return (error);
 640 }
 641
 642 /*
 643  * SIOC[GAD]LIFADDR.
 644  *      SIOCGLIFADDR: get first address. (?!?)
 645  *      SIOCGLIFADDR with IFLR_PREFIX:
 646  *              get first address that matches the specified prefix.
 647  *      SIOCALIFADDR: add the specified address.
 648  *      SIOCALIFADDR with IFLR_PREFIX:
 649  *              EINVAL since we can't deduce hostid part of the address.
 650  *      SIOCDLIFADDR: delete the specified address.
 651  *      SIOCDLIFADDR with IFLR_PREFIX:
 652  *              delete the first address that matches the specified prefix.
 653  * return values:
 654  *      EINVAL on invalid parameters
 655  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 656  *      other values may be returned from in_ioctl()
 657  */
 658 static int
 659 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 660     struct ifnet *ifp, struct thread *td)
 661 {
 662         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 663         struct ifaddr *ifa;
 664
 665         /* sanity checks */
 666         if (data == NULL || ifp == NULL) {
 667                 panic("invalid argument to in_lifaddr_ioctl");
 668                 /*NOTRECHED*/
 669         }
 670
 671         switch (cmd) {
 672         case SIOCGLIFADDR:
 673                 /* address must be specified on GET with IFLR_PREFIX */
 674                 if ((iflr->flags & IFLR_PREFIX) == 0)
 675                         break;
 676                 /*FALLTHROUGH*/
 677         case SIOCALIFADDR:
 678         case SIOCDLIFADDR:
 679                 /* address must be specified on ADD and DELETE */
 680                 if (iflr->addr.ss_family != AF_INET)
 681                         return (EINVAL);
 682                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 683                         return (EINVAL);
 684                 /* XXX need improvement */
 685                 if (iflr->dstaddr.ss_family
 686                  && iflr->dstaddr.ss_family != AF_INET)
 687                         return (EINVAL);
 688                 if (iflr->dstaddr.ss_family
 689                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 690                         return (EINVAL);
 691                 break;
 692         default: /*shouldn't happen*/
 693                 return (EOPNOTSUPP);
 694         }
 695         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 696                 return (EINVAL);
 697
 698         switch (cmd) {
 699         case SIOCALIFADDR:
 700             {
 701                 struct in_aliasreq ifra;
 702
 703                 if (iflr->flags & IFLR_PREFIX)
 704                         return (EINVAL);
 705
 706                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 707                 bzero(&ifra, sizeof(ifra));
 708                 bcopy(iflr->iflr_name, ifra.ifra_name,
 709                         sizeof(ifra.ifra_name));
 710
 711                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 712
 713                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 714                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 715                                 iflr->dstaddr.ss_len);
 716                 }
 717
 718                 ifra.ifra_mask.sin_family = AF_INET;
 719                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 720                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 721
 722                 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td));
 723             }
 724         case SIOCGLIFADDR:
 725         case SIOCDLIFADDR:
 726             {
 727                 struct in_ifaddr *ia;
 728                 struct in_addr mask, candidate, match;
 729                 struct sockaddr_in *sin;
 730
 731                 bzero(&mask, sizeof(mask));
 732                 bzero(&match, sizeof(match));
 733                 if (iflr->flags & IFLR_PREFIX) {
 734                         /* lookup a prefix rather than address. */
 735                         in_len2mask(&mask, iflr->prefixlen);
 736
 737                         sin = (struct sockaddr_in *)&iflr->addr;
 738                         match.s_addr = sin->sin_addr.s_addr;
 739                         match.s_addr &= mask.s_addr;
 740
 741                         /* if you set extra bits, that's wrong */
 742                         if (match.s_addr != sin->sin_addr.s_addr)
 743                                 return (EINVAL);
 744
 745                 } else {
 746                         /* on getting an address, take the 1st match */
 747                         /* on deleting an address, do exact match */
 748                         if (cmd != SIOCGLIFADDR) {
 749                                 in_len2mask(&mask, 32);
 750                                 sin = (struct sockaddr_in *)&iflr->addr;
 751                                 match.s_addr = sin->sin_addr.s_addr;
 752                         }
 753                 }
 754
 755                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 756                         if (ifa->ifa_addr->sa_family != AF_INET6)
 757                                 continue;
 758                         if (match.s_addr == 0)
 759                                 break;
 760                         candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 761                         candidate.s_addr &= mask.s_addr;
 762                         if (candidate.s_addr == match.s_addr)
 763                                 break;
 764                 }
 765                 if (ifa == NULL)
 766                         return (EADDRNOTAVAIL);
 767                 ia = (struct in_ifaddr *)ifa;
 768
 769                 if (cmd == SIOCGLIFADDR) {
 770                         /* fill in the if_laddrreq structure */
 771                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 772
 773                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 774                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 775                                         ia->ia_dstaddr.sin_len);
 776                         } else
 777                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 778
 779                         iflr->prefixlen =
 780                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 781
 782                         iflr->flags = 0;        /*XXX*/
 783
 784                         return (0);
 785                 } else {
 786                         struct in_aliasreq ifra;
 787
 788                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 789                         bzero(&ifra, sizeof(ifra));
 790                         bcopy(iflr->iflr_name, ifra.ifra_name,
 791                                 sizeof(ifra.ifra_name));
 792
 793                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 794                                 ia->ia_addr.sin_len);
 795                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 796                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 797                                         ia->ia_dstaddr.sin_len);
 798                         }
 799                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 800                                 ia->ia_sockmask.sin_len);
 801
 802                         return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
 803                             ifp, td));
 804                 }
 805             }
 806         }
 807
 808         return (EOPNOTSUPP);    /*just for safety*/
 809 }
 810
 811 /*
 812  * Delete any existing route for an interface.
 813  */
 814 void
 815 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
 816 {
 817
 818         in_scrubprefix(ia);
 819 }
 820
 821 /*
 822  * Initialize an interface's internet address
 823  * and routing table entry.
 824  */
 825 static int
 826 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
 827     int scrub)
 828 {
 829         register u_long i = ntohl(sin->sin_addr.s_addr);
 830         struct sockaddr_in oldaddr;
 831         int s = splimp(), flags = RTF_UP, error = 0;
 832
 833         oldaddr = ia->ia_addr;
 834         if (oldaddr.sin_family == AF_INET)
 835                 LIST_REMOVE(ia, ia_hash);
 836         ia->ia_addr = *sin;
 837         if (ia->ia_addr.sin_family == AF_INET) {
 838                 IN_IFADDR_WLOCK();
 839                 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 840                     ia, ia_hash);
 841                 IN_IFADDR_WUNLOCK();
 842         }
 843         /*
 844          * Give the interface a chance to initialize
 845          * if this is its first address,
 846          * and to validate the address if necessary.
 847          */
 848         if (ifp->if_ioctl != NULL) {
 849                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 850                 if (error) {
 851                         splx(s);
 852                         /* LIST_REMOVE(ia, ia_hash) is done in in_control */
 853                         ia->ia_addr = oldaddr;
 854                         IN_IFADDR_WLOCK();
 855                         if (ia->ia_addr.sin_family == AF_INET)
 856                                 LIST_INSERT_HEAD(INADDR_HASH(
 857                                     ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
 858                         else
 859                                 /*
 860                                  * If oldaddr family is not AF_INET (e.g.
 861                                  * interface has been just created) in_control
 862                                  * does not call LIST_REMOVE, and we end up
 863                                  * with bogus ia entries in hash
 864                                  */
 865                                 LIST_REMOVE(ia, ia_hash);
 866                         IN_IFADDR_WUNLOCK();
 867                         return (error);
 868                 }
 869         }
 870         splx(s);
 871         if (scrub) {
 872                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 873                 in_ifscrub(ifp, ia);
 874                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 875         }
 876         if (IN_CLASSA(i))
 877                 ia->ia_netmask = IN_CLASSA_NET;
 878         else if (IN_CLASSB(i))
 879                 ia->ia_netmask = IN_CLASSB_NET;
 880         else
 881                 ia->ia_netmask = IN_CLASSC_NET;
 882         /*
 883          * The subnet mask usually includes at least the standard network part,
 884          * but may may be smaller in the case of supernetting.
 885          * If it is set, we believe it.
 886          */
 887         if (ia->ia_subnetmask == 0) {
 888                 ia->ia_subnetmask = ia->ia_netmask;
 889                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
 890         } else
 891                 ia->ia_netmask &= ia->ia_subnetmask;
 892         ia->ia_net = i & ia->ia_netmask;
 893         ia->ia_subnet = i & ia->ia_subnetmask;
 894         in_socktrim(&ia->ia_sockmask);
 895 #ifdef DEV_CARP
 896         /*
 897          * XXX: carp(4) does not have interface route
 898          */
 899         if (ifp->if_type == IFT_CARP)
 900                 return (0);
 901 #endif
 902         /*
 903          * Add route for the network.
 904          */
 905         ia->ia_ifa.ifa_metric = ifp->if_metric;
 906         if (ifp->if_flags & IFF_BROADCAST) {
 907                 ia->ia_broadaddr.sin_addr.s_addr =
 908                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
 909                 ia->ia_netbroadcast.s_addr =
 910                         htonl(ia->ia_net | ~ ia->ia_netmask);
 911         } else if (ifp->if_flags & IFF_LOOPBACK) {
 912                 ia->ia_dstaddr = ia->ia_addr;
 913                 flags |= RTF_HOST;
 914         } else if (ifp->if_flags & IFF_POINTOPOINT) {
 915                 if (ia->ia_dstaddr.sin_family != AF_INET)
 916                         return (0);
 917                 flags |= RTF_HOST;
 918         }
 919         if ((error = in_addprefix(ia, flags)) != 0)
 920                 return (error);
 921
 922         if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
 923                 return (0);
 924
 925         if (ifp->if_flags & IFF_POINTOPOINT) {
 926                 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
 927                         return (0);
 928         }
 929
 930
 931         /*
 932          * add a loopback route to self
 933          */
 934         if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) {
 935                 struct route ia_ro;
 936
 937                 bzero(&ia_ro, sizeof(ia_ro));
 938                 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr;
 939                 rtalloc_ign_fib(&ia_ro, 0, 0);
 940                 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
 941                     (ia_ro.ro_rt->rt_ifp == V_loif)) {
 942                         RT_LOCK(ia_ro.ro_rt);
 943                         RT_ADDREF(ia_ro.ro_rt);
 944                         RTFREE_LOCKED(ia_ro.ro_rt);
 945                 } else
 946                         error = ifa_add_loopback_route((struct ifaddr *)ia,
 947                                        (struct sockaddr *)&ia->ia_addr);
 948                 if (error == 0)
 949                         ia->ia_flags |= IFA_RTSELF;
 950                 if (ia_ro.ro_rt != NULL)
 951                         RTFREE(ia_ro.ro_rt);
 952         }
 953
 954         return (error);
 955 }
 956
 957 #define rtinitflags(x) \
 958         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
 959             ? RTF_HOST : 0)
 960
 961 /*
 962  * Generate a routing message when inserting or deleting
 963  * an interface address alias.
 964  */
 965 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix,
 966     struct in_ifaddr *target)
 967 {
 968         struct route pfx_ro;
 969         struct sockaddr_in *pfx_addr;
 970         struct rtentry msg_rt;
 971
 972         /* QL: XXX
 973          * This is a bit questionable because there is no
 974          * additional route entry added/deleted for an address
 975          * alias. Therefore this route report is inaccurate.
 976          */
 977         bzero(&pfx_ro, sizeof(pfx_ro));
 978         pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst);
 979         pfx_addr->sin_len = sizeof(*pfx_addr);
 980         pfx_addr->sin_family = AF_INET;
 981         pfx_addr->sin_addr = *prefix;
 982         rtalloc_ign_fib(&pfx_ro, 0, 0);
 983         if (pfx_ro.ro_rt != NULL) {
 984                 msg_rt = *pfx_ro.ro_rt;
 985
 986                 /* QL: XXX
 987                  * Point the gateway to the new interface
 988                  * address as if a new prefix route entry has
 989                  * been added through the new address alias.
 990                  * All other parts of the rtentry is accurate,
 991                  * e.g., rt_key, rt_mask, rt_ifp etc.
 992                  */
 993                 msg_rt.rt_gateway =
 994                         (struct sockaddr *)&target->ia_addr;
 995                 rt_newaddrmsg(cmd,
 996                               (struct ifaddr *)target,
 997                               0, &msg_rt);
 998                 RTFREE(pfx_ro.ro_rt);
 999         }
1000         return;
1001 }
1002
1003 /*
1004  * Check if we have a route for the given prefix already or add one accordingly.
1005  */
1006 static int
1007 in_addprefix(struct in_ifaddr *target, int flags)
1008 {
1009         struct in_ifaddr *ia;
1010         struct in_addr prefix, mask, p, m;
1011         int error;
1012
1013         if ((flags & RTF_HOST) != 0) {
1014                 prefix = target->ia_dstaddr.sin_addr;
1015                 mask.s_addr = 0;
1016         } else {
1017                 prefix = target->ia_addr.sin_addr;
1018                 mask = target->ia_sockmask.sin_addr;
1019                 prefix.s_addr &= mask.s_addr;
1020         }
1021
1022         IN_IFADDR_RLOCK();
1023         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1024                 if (rtinitflags(ia)) {
1025                         p = ia->ia_addr.sin_addr;
1026
1027                         if (prefix.s_addr != p.s_addr)
1028                                 continue;
1029                 } else {
1030                         p = ia->ia_addr.sin_addr;
1031                         m = ia->ia_sockmask.sin_addr;
1032                         p.s_addr &= m.s_addr;
1033
1034                         if (prefix.s_addr != p.s_addr ||
1035                             mask.s_addr != m.s_addr)
1036                                 continue;
1037                 }
1038
1039                 /*
1040                  * If we got a matching prefix route inserted by other
1041                  * interface address, we are done here.
1042                  */
1043                 if (ia->ia_flags & IFA_ROUTE) {
1044 #ifdef RADIX_MPATH
1045                         if (ia->ia_addr.sin_addr.s_addr ==
1046                             target->ia_addr.sin_addr.s_addr)
1047                                 return (EEXIST);
1048                         else
1049                                 break;
1050 #endif
1051                         if (V_sameprefixcarponly &&
1052                             target->ia_ifp->if_type != IFT_CARP &&
1053                             ia->ia_ifp->if_type != IFT_CARP) {
1054                                 IN_IFADDR_RUNLOCK();
1055                                 return (EEXIST);
1056                         } else {
1057                                 in_addralias_rtmsg(RTM_ADD, &prefix, target);
1058                                 IN_IFADDR_RUNLOCK();
1059                                 return (0);
1060                         }
1061                 }
1062         }
1063         IN_IFADDR_RUNLOCK();
1064
1065         /*
1066          * No-one seem to have this prefix route, so we try to insert it.
1067          */
1068         error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
1069         if (!error)
1070                 target->ia_flags |= IFA_ROUTE;
1071         return (error);
1072 }
1073
1074 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
1075
1076 /*
1077  * If there is no other address in the system that can serve a route to the
1078  * same prefix, remove the route.  Hand over the route to the new address
1079  * otherwise.
1080  */
1081 static int
1082 in_scrubprefix(struct in_ifaddr *target)
1083 {
1084         struct in_ifaddr *ia;
1085         struct in_addr prefix, mask, p;
1086         int error = 0;
1087         struct sockaddr_in prefix0, mask0;
1088
1089         /*
1090          * Remove the loopback route to the interface address.
1091          * The "useloopback" setting is not consulted because if the
1092          * user configures an interface address, turns off this
1093          * setting, and then tries to delete that interface address,
1094          * checking the current setting of "useloopback" would leave
1095          * that interface address loopback route untouched, which
1096          * would be wrong. Therefore the interface address loopback route
1097          * deletion is unconditional.
1098          */
1099         if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
1100             !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
1101             (target->ia_flags & IFA_RTSELF)) {
1102                 struct route ia_ro;
1103                 int freeit = 0;
1104
1105                 bzero(&ia_ro, sizeof(ia_ro));
1106                 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr;
1107                 rtalloc_ign_fib(&ia_ro, 0, 0);
1108                 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
1109                     (ia_ro.ro_rt->rt_ifp == V_loif)) {
1110                         RT_LOCK(ia_ro.ro_rt);
1111                         if (ia_ro.ro_rt->rt_refcnt <= 1)
1112                                 freeit = 1;
1113                         else
1114                                 RT_REMREF(ia_ro.ro_rt);
1115                         RTFREE_LOCKED(ia_ro.ro_rt);
1116                 }
1117                 if (freeit)
1118                         error = ifa_del_loopback_route((struct ifaddr *)target,
1119                                        (struct sockaddr *)&target->ia_addr);
1120                 if (error == 0)
1121                         target->ia_flags &= ~IFA_RTSELF;
1122                 /* remove arp cache */
1123                 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
1124         }
1125
1126         if (rtinitflags(target))
1127                 prefix = target->ia_dstaddr.sin_addr;
1128         else {
1129                 prefix = target->ia_addr.sin_addr;
1130                 mask = target->ia_sockmask.sin_addr;
1131                 prefix.s_addr &= mask.s_addr;
1132         }
1133
1134         if ((target->ia_flags & IFA_ROUTE) == 0) {
1135                 in_addralias_rtmsg(RTM_DELETE, &prefix, target);
1136                 return (0);
1137         }
1138
1139         IN_IFADDR_RLOCK();
1140         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1141                 if (rtinitflags(ia))
1142                         p = ia->ia_dstaddr.sin_addr;
1143                 else {
1144                         p = ia->ia_addr.sin_addr;
1145                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1146                 }
1147
1148                 if (prefix.s_addr != p.s_addr)
1149                         continue;
1150
1151                 /*
1152                  * If we got a matching prefix address, move IFA_ROUTE and
1153                  * the route itself to it.  Make sure that routing daemons
1154                  * get a heads-up.
1155                  *
1156                  * XXX: a special case for carp(4) interface
1157                  */
1158                 if ((ia->ia_flags & IFA_ROUTE) == 0
1159 #ifdef DEV_CARP
1160                     && (ia->ia_ifp->if_type != IFT_CARP)
1161 #endif
1162                                                         ) {
1163                         IN_IFADDR_RUNLOCK();
1164                         rtinit(&(target->ia_ifa), (int)RTM_DELETE,
1165                             rtinitflags(target));
1166                         target->ia_flags &= ~IFA_ROUTE;
1167
1168                         error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
1169                             rtinitflags(ia) | RTF_UP);
1170                         if (error == 0)
1171                                 ia->ia_flags |= IFA_ROUTE;
1172                         return (error);
1173                 }
1174         }
1175         IN_IFADDR_RUNLOCK();
1176
1177         /*
1178          * remove all L2 entries on the given prefix
1179          */
1180         bzero(&prefix0, sizeof(prefix0));
1181         prefix0.sin_len = sizeof(prefix0);
1182         prefix0.sin_family = AF_INET;
1183         prefix0.sin_addr.s_addr = target->ia_subnet;
1184         bzero(&mask0, sizeof(mask0));
1185         mask0.sin_len = sizeof(mask0);
1186         mask0.sin_family = AF_INET;
1187         mask0.sin_addr.s_addr = target->ia_subnetmask;
1188         lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
1189                             (struct sockaddr *)&mask0);
1190
1191         /*
1192          * As no-one seem to have this prefix, we can remove the route.
1193          */
1194         rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
1195         target->ia_flags &= ~IFA_ROUTE;
1196         return (0);
1197 }
1198
1199 #undef rtinitflags
1200
1201 /*
1202  * Return 1 if the address might be a local broadcast address.
1203  */
1204 int
1205 in_broadcast(struct in_addr in, struct ifnet *ifp)
1206 {
1207         register struct ifaddr *ifa;
1208         u_long t;
1209
1210         if (in.s_addr == INADDR_BROADCAST ||
1211             in.s_addr == INADDR_ANY)
1212                 return (1);
1213         if ((ifp->if_flags & IFF_BROADCAST) == 0)
1214                 return (0);
1215         t = ntohl(in.s_addr);
1216         /*
1217          * Look through the list of addresses for a match
1218          * with a broadcast address.
1219          */
1220 #define ia ((struct in_ifaddr *)ifa)
1221         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1222                 if (ifa->ifa_addr->sa_family == AF_INET &&
1223                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1224                      in.s_addr == ia->ia_netbroadcast.s_addr ||
1225                      /*
1226                       * Check for old-style (host 0) broadcast.
1227                       */
1228                      t == ia->ia_subnet || t == ia->ia_net) &&
1229                      /*
1230                       * Check for an all one subnetmask. These
1231                       * only exist when an interface gets a secondary
1232                       * address.
1233                       */
1234                      ia->ia_subnetmask != (u_long)0xffffffff)
1235                             return (1);
1236         return (0);
1237 #undef ia
1238 }
1239
1240 /*
1241  * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1242  */
1243 void
1244 in_ifdetach(struct ifnet *ifp)
1245 {
1246
1247         in_pcbpurgeif0(&V_ripcbinfo, ifp);
1248         in_pcbpurgeif0(&V_udbinfo, ifp);
1249         in_purgemaddrs(ifp);
1250 }
1251
1252 /*
1253  * Delete all IPv4 multicast address records, and associated link-layer
1254  * multicast address records, associated with ifp.
1255  * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1256  * XXX This should not race with ifma_protospec being set during
1257  * a new allocation, if it does, we have bigger problems.
1258  */
1259 static void
1260 in_purgemaddrs(struct ifnet *ifp)
1261 {
1262         LIST_HEAD(,in_multi) purgeinms;
1263         struct in_multi         *inm, *tinm;
1264         struct ifmultiaddr      *ifma;
1265
1266         LIST_INIT(&purgeinms);
1267         IN_MULTI_LOCK();
1268
1269         /*
1270          * Extract list of in_multi associated with the detaching ifp
1271          * which the PF_INET layer is about to release.
1272          * We need to do this as IF_ADDR_LOCK() may be re-acquired
1273          * by code further down.
1274          */
1275         IF_ADDR_LOCK(ifp);
1276         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1277                 if (ifma->ifma_addr->sa_family != AF_INET ||
1278                     ifma->ifma_protospec == NULL)
1279                         continue;
1280 #if 0
1281                 KASSERT(ifma->ifma_protospec != NULL,
1282                     ("%s: ifma_protospec is NULL", __func__));
1283 #endif
1284                 inm = (struct in_multi *)ifma->ifma_protospec;
1285                 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
1286         }
1287         IF_ADDR_UNLOCK(ifp);
1288
1289         LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
1290                 LIST_REMOVE(inm, inm_link);
1291                 inm_release_locked(inm);
1292         }
1293         igmp_ifdetach(ifp);
1294
1295         IN_MULTI_UNLOCK();
1296 }
1297
1298 #include <net/if_dl.h>
1299 #include <netinet/if_ether.h>
1300
1301 struct in_llentry {
1302         struct llentry          base;
1303         struct sockaddr_in      l3_addr4;
1304 };
1305
1306 static struct llentry *
1307 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
1308 {
1309         struct in_llentry *lle;
1310
1311         lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO);
1312         if (lle == NULL)                /* NB: caller generates msg */
1313                 return NULL;
1314
1315         callout_init(&lle->base.la_timer, CALLOUT_MPSAFE);
1316         /*
1317          * For IPv4 this will trigger "arpresolve" to generate
1318          * an ARP request.
1319          */
1320         lle->base.la_expire = time_second; /* mark expired */
1321         lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
1322         lle->base.lle_refcnt = 1;
1323         LLE_LOCK_INIT(&lle->base);
1324         return &lle->base;
1325 }
1326
1327 /*
1328  * Deletes an address from the address table.
1329  * This function is called by the timer functions
1330  * such as arptimer() and nd6_llinfo_timer(), and
1331  * the caller does the locking.
1332  */
1333 static void
1334 in_lltable_free(struct lltable *llt, struct llentry *lle)
1335 {
1336         LLE_WUNLOCK(lle);
1337         LLE_LOCK_DESTROY(lle);
1338         free(lle, M_LLTABLE);
1339 }
1340
1341
1342 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)       (                       \
1343             (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
1344
1345 static void
1346 in_lltable_prefix_free(struct lltable *llt,
1347                        const struct sockaddr *prefix,
1348                        const struct sockaddr *mask)
1349 {
1350         const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
1351         const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
1352         struct llentry *lle, *next;
1353         register int i;
1354
1355         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
1356                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
1357
1358                         if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle),
1359                                                      pfx, msk)) {
1360                                 int canceled;
1361
1362                                 canceled = callout_drain(&lle->la_timer);
1363                                 LLE_WLOCK(lle);
1364                                 if (canceled)
1365                                         LLE_REMREF(lle);
1366                                 llentry_free(lle);
1367                         }
1368                 }
1369         }
1370 }
1371
1372
1373 static int
1374 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1375 {
1376         struct rtentry *rt;
1377
1378         KASSERT(l3addr->sa_family == AF_INET,
1379             ("sin_family %d", l3addr->sa_family));
1380
1381         /* XXX rtalloc1 should take a const param */
1382         rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
1383         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) ||
1384             ((rt->rt_ifp != ifp) && !(flags & LLE_PUB))) {
1385 #ifdef DIAGNOSTIC
1386                 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1387                     inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1388 #endif
1389                 if (rt != NULL)
1390                         RTFREE_LOCKED(rt);
1391                 return (EINVAL);
1392         }
1393         RTFREE_LOCKED(rt);
1394         return 0;
1395 }
1396
1397 /*
1398  * Return NULL if not found or marked for deletion.
1399  * If found return lle read locked.
1400  */
1401 static struct llentry *
1402 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1403 {
1404         const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1405         struct ifnet *ifp = llt->llt_ifp;
1406         struct llentry *lle;
1407         struct llentries *lleh;
1408         u_int hashkey;
1409
1410         IF_AFDATA_LOCK_ASSERT(ifp);
1411         KASSERT(l3addr->sa_family == AF_INET,
1412             ("sin_family %d", l3addr->sa_family));
1413
1414         hashkey = sin->sin_addr.s_addr;
1415         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
1416         LIST_FOREACH(lle, lleh, lle_next) {
1417                 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle);
1418                 if (lle->la_flags & LLE_DELETED)
1419                         continue;
1420                 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
1421                         break;
1422         }
1423         if (lle == NULL) {
1424 #ifdef DIAGNOSTIC
1425                 if (flags & LLE_DELETE)
1426                         log(LOG_INFO, "interface address is missing from cache = %p  in delete\n", lle);
1427 #endif
1428                 if (!(flags & LLE_CREATE))
1429                         return (NULL);
1430                 /*
1431                  * A route that covers the given address must have
1432                  * been installed 1st because we are doing a resolution,
1433                  * verify this.
1434                  */
1435                 if (!(flags & LLE_IFADDR) &&
1436                     in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1437                         goto done;
1438
1439                 lle = in_lltable_new(l3addr, flags);
1440                 if (lle == NULL) {
1441                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1442                         goto done;
1443                 }
1444                 lle->la_flags = flags & ~LLE_CREATE;
1445                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
1446                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
1447                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
1448                 }
1449
1450                 lle->lle_tbl  = llt;
1451                 lle->lle_head = lleh;
1452                 LIST_INSERT_HEAD(lleh, lle, lle_next);
1453         } else if (flags & LLE_DELETE) {
1454                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
1455                         LLE_WLOCK(lle);
1456                         lle->la_flags = LLE_DELETED;
1457                         LLE_WUNLOCK(lle);
1458 #ifdef DIAGNOSTIC
1459                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);
1460 #endif
1461                 }
1462                 lle = (void *)-1;
1463
1464         }
1465         if (LLE_IS_VALID(lle)) {
1466                 if (flags & LLE_EXCLUSIVE)
1467                         LLE_WLOCK(lle);
1468                 else
1469                         LLE_RLOCK(lle);
1470         }
1471 done:
1472         return (lle);
1473 }
1474
1475 static int
1476 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
1477 {
1478 #define SIN(lle)        ((struct sockaddr_in *) L3_ADDR(lle))
1479         struct ifnet *ifp = llt->llt_ifp;
1480         struct llentry *lle;
1481         /* XXX stack use */
1482         struct {
1483                 struct rt_msghdr        rtm;
1484                 struct sockaddr_inarp   sin;
1485                 struct sockaddr_dl      sdl;
1486         } arpc;
1487         int error, i;
1488
1489         LLTABLE_LOCK_ASSERT();
1490
1491         error = 0;
1492         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
1493                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
1494                         struct sockaddr_dl *sdl;
1495
1496                         /* skip deleted entries */
1497                         if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1498                                 continue;
1499                         /* Skip if jailed and not a valid IP of the prison. */
1500                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
1501                                 continue;
1502                         /*
1503                          * produce a msg made of:
1504                          *  struct rt_msghdr;
1505                          *  struct sockaddr_inarp; (IPv4)
1506                          *  struct sockaddr_dl;
1507                          */
1508                         bzero(&arpc, sizeof(arpc));
1509                         arpc.rtm.rtm_msglen = sizeof(arpc);
1510                         arpc.rtm.rtm_version = RTM_VERSION;
1511                         arpc.rtm.rtm_type = RTM_GET;
1512                         arpc.rtm.rtm_flags = RTF_UP;
1513                         arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1514                         arpc.sin.sin_family = AF_INET;
1515                         arpc.sin.sin_len = sizeof(arpc.sin);
1516                         arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
1517
1518                         /* publish */
1519                         if (lle->la_flags & LLE_PUB) {
1520                                 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1521                                 /* proxy only */
1522                                 if (lle->la_flags & LLE_PROXY)
1523                                         arpc.sin.sin_other = SIN_PROXY;
1524                         }
1525
1526                         sdl = &arpc.sdl;
1527                         sdl->sdl_family = AF_LINK;
1528                         sdl->sdl_len = sizeof(*sdl);
1529                         sdl->sdl_index = ifp->if_index;
1530                         sdl->sdl_type = ifp->if_type;
1531                         if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1532                                 sdl->sdl_alen = ifp->if_addrlen;
1533                                 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1534                         } else {
1535                                 sdl->sdl_alen = 0;
1536                                 bzero(LLADDR(sdl), ifp->if_addrlen);
1537                         }
1538
1539                         arpc.rtm.rtm_rmx.rmx_expire =
1540                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1541                         arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1542                         if (lle->la_flags & LLE_STATIC)
1543                                 arpc.rtm.rtm_flags |= RTF_STATIC;
1544                         arpc.rtm.rtm_index = ifp->if_index;
1545                         error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1546                         if (error)
1547                                 break;
1548                 }
1549         }
1550         return error;
1551 #undef SIN
1552 }
1553
1554 void *
1555 in_domifattach(struct ifnet *ifp)
1556 {
1557         struct in_ifinfo *ii;
1558         struct lltable *llt;
1559
1560         ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1561
1562         llt = lltable_init(ifp, AF_INET);
1563         if (llt != NULL) {
1564                 llt->llt_new = in_lltable_new;
1565                 llt->llt_free = in_lltable_free;
1566                 llt->llt_prefix_free = in_lltable_prefix_free;
1567                 llt->llt_rtcheck = in_lltable_rtcheck;
1568                 llt->llt_lookup = in_lltable_lookup;
1569                 llt->llt_dump = in_lltable_dump;
1570         }
1571         ii->ii_llt = llt;
1572
1573         ii->ii_igmp = igmp_domifattach(ifp);
1574
1575         return ii;
1576 }
1577
1578 void
1579 in_domifdetach(struct ifnet *ifp, void *aux)
1580 {
1581         struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1582
1583         igmp_domifdetach(ifp);
1584         lltable_free(ii->ii_llt);
1585         free(ii, M_IFADDR);
1586 }