sys/netinet/in.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)in.c        8.4 (Berkeley) 1/9/95
  34  * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
  35  * $DragonFly: src/sys/netinet/in.c,v 1.20 2006/10/01 00:38:21 swildner Exp $
  36  */
  37
  38 #include "opt_bootp.h"
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/sockio.h>
  42 #include <sys/malloc.h>
  43 #include <sys/proc.h>
  44 #include <sys/socket.h>
  45 #include <sys/kernel.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/if_types.h>
  51 #include <net/route.h>
  52
  53 #include <netinet/in.h>
  54 #include <netinet/in_var.h>
  55 #include <netinet/in_pcb.h>
  56
  57 #include <netinet/igmp_var.h>
  58
  59 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
  60
  61 static int in_mask2len (struct in_addr *);
  62 static void in_len2mask (struct in_addr *, int);
  63 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t,
  64         struct ifnet *, struct thread *);
  65
  66 static void     in_socktrim (struct sockaddr_in *);
  67 static int      in_ifinit (struct ifnet *,
  68             struct in_ifaddr *, struct sockaddr_in *, int);
  69
  70 static int subnetsarelocal = 0;
  71 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
  72         &subnetsarelocal, 0, "");
  73
  74 struct in_multihead in_multihead; /* XXX BSS initialization */
  75
  76 extern struct inpcbinfo ripcbinfo;
  77 extern struct inpcbinfo udbinfo;
  78
  79 /*
  80  * Return 1 if an internet address is for a ``local'' host
  81  * (one to which we have a connection).  If subnetsarelocal
  82  * is true, this includes other subnets of the local net.
  83  * Otherwise, it includes only the directly-connected (sub)nets.
  84  */
  85 int
  86 in_localaddr(struct in_addr in)
  87 {
  88         u_long i = ntohl(in.s_addr);
  89         struct in_ifaddr *ia;
  90
  91         if (subnetsarelocal) {
  92                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
  93                         if ((i & ia->ia_netmask) == ia->ia_net)
  94                                 return (1);
  95         } else {
  96                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
  97                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
  98                                 return (1);
  99         }
 100         return (0);
 101 }
 102
 103 /*
 104  * Determine whether an IP address is in a reserved set of addresses
 105  * that may not be forwarded, or whether datagrams to that destination
 106  * may be forwarded.
 107  */
 108 int
 109 in_canforward(struct in_addr in)
 110 {
 111         u_long i = ntohl(in.s_addr);
 112         u_long net;
 113
 114         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
 115                 return (0);
 116         if (IN_CLASSA(i)) {
 117                 net = i & IN_CLASSA_NET;
 118                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
 119                         return (0);
 120         }
 121         return (1);
 122 }
 123
 124 /*
 125  * Trim a mask in a sockaddr
 126  */
 127 static void
 128 in_socktrim(struct sockaddr_in *ap)
 129 {
 130     char *cplim = (char *) &ap->sin_addr;
 131     char *cp = (char *) (&ap->sin_addr + 1);
 132
 133     ap->sin_len = 0;
 134     while (--cp >= cplim)
 135         if (*cp) {
 136             (ap)->sin_len = cp - (char *) (ap) + 1;
 137             break;
 138         }
 139 }
 140
 141 static int
 142 in_mask2len(struct in_addr *mask)
 143 {
 144         int x, y;
 145         u_char *p;
 146
 147         p = (u_char *)mask;
 148         for (x = 0; x < sizeof *mask; x++) {
 149                 if (p[x] != 0xff)
 150                         break;
 151         }
 152         y = 0;
 153         if (x < sizeof *mask) {
 154                 for (y = 0; y < 8; y++) {
 155                         if ((p[x] & (0x80 >> y)) == 0)
 156                                 break;
 157                 }
 158         }
 159         return x * 8 + y;
 160 }
 161
 162 static void
 163 in_len2mask(struct in_addr *mask, int len)
 164 {
 165         int i;
 166         u_char *p;
 167
 168         p = (u_char *)mask;
 169         bzero(mask, sizeof *mask);
 170         for (i = 0; i < len / 8; i++)
 171                 p[i] = 0xff;
 172         if (len % 8)
 173                 p[i] = (0xff00 >> (len % 8)) & 0xff;
 174 }
 175
 176 static int in_interfaces;       /* number of external internet interfaces */
 177
 178 /*
 179  * Generic internet control operations (ioctl's).
 180  * Ifp is 0 if not an interface-specific ioctl.
 181  *
 182  * NOTE! td might be NULL.
 183  */
 184 /* ARGSUSED */
 185 int
 186 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 187            struct thread *td)
 188 {
 189         struct ifreq *ifr = (struct ifreq *)data;
 190         struct in_ifaddr *ia = 0, *iap;
 191         struct ifaddr *ifa;
 192         struct in_addr dst;
 193         struct in_ifaddr *oia;
 194         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
 195         struct sockaddr_in oldaddr;
 196         int hostIsNew, iaIsNew, maskIsNew;
 197         int error = 0;
 198
 199         iaIsNew = 0;
 200
 201         switch (cmd) {
 202         case SIOCALIFADDR:
 203         case SIOCDLIFADDR:
 204                 if (td && (error = suser(td)) != 0)
 205                         return error;
 206                 /*fall through*/
 207         case SIOCGLIFADDR:
 208                 if (!ifp)
 209                         return EINVAL;
 210                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
 211         }
 212
 213         /*
 214          * Find address for this interface, if it exists.
 215          *
 216          * If an alias address was specified, find that one instead of
 217          * the first one on the interface, if possible
 218          */
 219         if (ifp) {
 220                 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
 221                 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
 222                         if (iap->ia_ifp == ifp &&
 223                             iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
 224                                 ia = iap;
 225                                 break;
 226                         }
 227                 if (ia == NULL)
 228                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 229                                 iap = ifatoia(ifa);
 230                                 if (iap->ia_addr.sin_family == AF_INET) {
 231                                         ia = iap;
 232                                         break;
 233                                 }
 234                         }
 235         }
 236
 237         switch (cmd) {
 238
 239         case SIOCAIFADDR:
 240         case SIOCDIFADDR:
 241                 if (ifp == 0)
 242                         return (EADDRNOTAVAIL);
 243                 if (ifra->ifra_addr.sin_family == AF_INET) {
 244                         for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
 245                                 if (ia->ia_ifp == ifp  &&
 246                                     ia->ia_addr.sin_addr.s_addr ==
 247                                     ifra->ifra_addr.sin_addr.s_addr)
 248                                         break;
 249                         }
 250                         if ((ifp->if_flags & IFF_POINTOPOINT)
 251                             && (cmd == SIOCAIFADDR)
 252                             && (ifra->ifra_dstaddr.sin_addr.s_addr
 253                                 == INADDR_ANY)) {
 254                                 return EDESTADDRREQ;
 255                         }
 256                 }
 257                 if (cmd == SIOCDIFADDR && ia == 0)
 258                         return (EADDRNOTAVAIL);
 259                 /* FALLTHROUGH */
 260         case SIOCSIFADDR:
 261         case SIOCSIFNETMASK:
 262         case SIOCSIFDSTADDR:
 263                 if (td && (error = suser(td)) != 0)
 264                         return error;
 265
 266                 if (ifp == 0)
 267                         return (EADDRNOTAVAIL);
 268                 if (ia == (struct in_ifaddr *)0) {
 269                         ia = (struct in_ifaddr *)
 270                                 kmalloc(sizeof *ia, M_IFADDR, M_WAITOK);
 271                         if (ia == (struct in_ifaddr *)NULL)
 272                                 return (ENOBUFS);
 273                         bzero(ia, sizeof *ia);
 274                         /*
 275                          * Protect from ipintr() traversing address list
 276                          * while we're modifying it.
 277                          */
 278                         crit_enter();
 279
 280                         TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
 281                         ifa = &ia->ia_ifa;
 282                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 283
 284                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
 285                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 286                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
 287                         ia->ia_sockmask.sin_len = 8;
 288                         ia->ia_sockmask.sin_family = AF_INET;
 289                         if (ifp->if_flags & IFF_BROADCAST) {
 290                                 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
 291                                 ia->ia_broadaddr.sin_family = AF_INET;
 292                         }
 293                         ia->ia_ifp = ifp;
 294                         if (!(ifp->if_flags & IFF_LOOPBACK))
 295                                 in_interfaces++;
 296                         iaIsNew = 1;
 297                         crit_exit();
 298                 }
 299                 break;
 300
 301         case SIOCSIFBRDADDR:
 302                 if (td && (error = suser(td)) != 0)
 303                         return error;
 304                 /* FALLTHROUGH */
 305
 306         case SIOCGIFADDR:
 307         case SIOCGIFNETMASK:
 308         case SIOCGIFDSTADDR:
 309         case SIOCGIFBRDADDR:
 310                 if (ia == (struct in_ifaddr *)0)
 311                         return (EADDRNOTAVAIL);
 312                 break;
 313         }
 314         switch (cmd) {
 315
 316         case SIOCGIFADDR:
 317                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
 318                 return (0);
 319
 320         case SIOCGIFBRDADDR:
 321                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 322                         return (EINVAL);
 323                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
 324                 return (0);
 325
 326         case SIOCGIFDSTADDR:
 327                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 328                         return (EINVAL);
 329                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
 330                 return (0);
 331
 332         case SIOCGIFNETMASK:
 333                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
 334                 return (0);
 335
 336         case SIOCSIFDSTADDR:
 337                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 338                         return (EINVAL);
 339                 oldaddr = ia->ia_dstaddr;
 340                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
 341                 lwkt_serialize_enter(ifp->if_serializer);
 342                 if (ifp->if_ioctl &&
 343                     (error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 344                                               td->td_proc->p_ucred))) {
 345                         ia->ia_dstaddr = oldaddr;
 346                         lwkt_serialize_exit(ifp->if_serializer);
 347                         return (error);
 348                 }
 349                 if (ia->ia_flags & IFA_ROUTE) {
 350                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
 351                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 352                         ia->ia_ifa.ifa_dstaddr =
 353                                         (struct sockaddr *)&ia->ia_dstaddr;
 354                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
 355                 }
 356                 lwkt_serialize_exit(ifp->if_serializer);
 357                 return (0);
 358
 359         case SIOCSIFBRDADDR:
 360                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 361                         return (EINVAL);
 362                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
 363                 return (0);
 364
 365         case SIOCSIFADDR:
 366                 error = in_ifinit(ifp, ia,
 367                     (struct sockaddr_in *) &ifr->ifr_addr, 1);
 368                 if (error != 0 && iaIsNew)
 369                         break;
 370                 if (error == 0)
 371                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 372                 return (0);
 373
 374         case SIOCSIFNETMASK:
 375                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
 376                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
 377                 return (0);
 378
 379         case SIOCAIFADDR:
 380                 maskIsNew = 0;
 381                 hostIsNew = 1;
 382                 error = 0;
 383                 if (ia->ia_addr.sin_family == AF_INET) {
 384                         if (ifra->ifra_addr.sin_len == 0) {
 385                                 ifra->ifra_addr = ia->ia_addr;
 386                                 hostIsNew = 0;
 387                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
 388                                                ia->ia_addr.sin_addr.s_addr)
 389                                 hostIsNew = 0;
 390                 }
 391                 if (ifra->ifra_mask.sin_len) {
 392                         in_ifscrub(ifp, ia);
 393                         ia->ia_sockmask = ifra->ifra_mask;
 394                         ia->ia_sockmask.sin_family = AF_INET;
 395                         ia->ia_subnetmask =
 396                              ntohl(ia->ia_sockmask.sin_addr.s_addr);
 397                         maskIsNew = 1;
 398                 }
 399                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 400                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
 401                         in_ifscrub(ifp, ia);
 402                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 403                         maskIsNew  = 1; /* We lie; but the effect's the same */
 404                 }
 405                 if (ifra->ifra_addr.sin_family == AF_INET &&
 406                     (hostIsNew || maskIsNew))
 407                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 408
 409                 if (error != 0 && iaIsNew)
 410                         break;
 411
 412                 if ((ifp->if_flags & IFF_BROADCAST) &&
 413                     (ifra->ifra_broadaddr.sin_family == AF_INET))
 414                         ia->ia_broadaddr = ifra->ifra_broadaddr;
 415                 if (error == 0)
 416                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 417                 return (error);
 418
 419         case SIOCDIFADDR:
 420                 /*
 421                  * in_ifscrub kills the interface route.
 422                  */
 423                 in_ifscrub(ifp, ia);
 424                 /*
 425                  * in_ifadown gets rid of all the rest of
 426                  * the routes.  This is not quite the right
 427                  * thing to do, but at least if we are running
 428                  * a routing process they will come back.
 429                  */
 430                 in_ifadown(&ia->ia_ifa, 1);
 431                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
 432                 error = 0;
 433                 break;
 434
 435         default:
 436                 if (ifp == NULL || ifp->if_ioctl == NULL)
 437                         return (EOPNOTSUPP);
 438                 lwkt_serialize_enter(ifp->if_serializer);
 439                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
 440                 lwkt_serialize_exit(ifp->if_serializer);
 441                 return (error);
 442         }
 443
 444         /*
 445          * Protect from ipintr() traversing address list while we're modifying
 446          * it.
 447          */
 448         lwkt_serialize_enter(ifp->if_serializer);
 449         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 450         TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
 451         LIST_REMOVE(ia, ia_hash);
 452         IFAFREE(&ia->ia_ifa);
 453         lwkt_serialize_exit(ifp->if_serializer);
 454
 455         return (error);
 456 }
 457
 458 /*
 459  * SIOC[GAD]LIFADDR.
 460  *      SIOCGLIFADDR: get first address. (?!?)
 461  *      SIOCGLIFADDR with IFLR_PREFIX:
 462  *              get first address that matches the specified prefix.
 463  *      SIOCALIFADDR: add the specified address.
 464  *      SIOCALIFADDR with IFLR_PREFIX:
 465  *              EINVAL since we can't deduce hostid part of the address.
 466  *      SIOCDLIFADDR: delete the specified address.
 467  *      SIOCDLIFADDR with IFLR_PREFIX:
 468  *              delete the first address that matches the specified prefix.
 469  * return values:
 470  *      EINVAL on invalid parameters
 471  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 472  *      other values may be returned from in_ioctl()
 473  *
 474  * NOTE! td might be NULL.
 475  */
 476 static int
 477 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
 478                  struct thread *td)
 479 {
 480         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 481         struct ifaddr *ifa;
 482
 483         /* sanity checks */
 484         if (!data || !ifp) {
 485                 panic("invalid argument to in_lifaddr_ioctl");
 486                 /*NOTRECHED*/
 487         }
 488
 489         switch (cmd) {
 490         case SIOCGLIFADDR:
 491                 /* address must be specified on GET with IFLR_PREFIX */
 492                 if ((iflr->flags & IFLR_PREFIX) == 0)
 493                         break;
 494                 /*FALLTHROUGH*/
 495         case SIOCALIFADDR:
 496         case SIOCDLIFADDR:
 497                 /* address must be specified on ADD and DELETE */
 498                 if (iflr->addr.ss_family != AF_INET)
 499                         return EINVAL;
 500                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
 501                         return EINVAL;
 502                 /* XXX need improvement */
 503                 if (iflr->dstaddr.ss_family
 504                  && iflr->dstaddr.ss_family != AF_INET)
 505                         return EINVAL;
 506                 if (iflr->dstaddr.ss_family
 507                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
 508                         return EINVAL;
 509                 break;
 510         default: /*shouldn't happen*/
 511                 return EOPNOTSUPP;
 512         }
 513         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
 514                 return EINVAL;
 515
 516         switch (cmd) {
 517         case SIOCALIFADDR:
 518             {
 519                 struct in_aliasreq ifra;
 520
 521                 if (iflr->flags & IFLR_PREFIX)
 522                         return EINVAL;
 523
 524                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 525                 bzero(&ifra, sizeof ifra);
 526                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
 527
 528                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
 529
 530                 if (iflr->dstaddr.ss_family) {  /*XXX*/
 531                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 532                                 iflr->dstaddr.ss_len);
 533                 }
 534
 535                 ifra.ifra_mask.sin_family = AF_INET;
 536                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
 537                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 538
 539                 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
 540             }
 541         case SIOCGLIFADDR:
 542         case SIOCDLIFADDR:
 543             {
 544                 struct in_ifaddr *ia;
 545                 struct in_addr mask, candidate, match;
 546                 struct sockaddr_in *sin;
 547                 int cmp;
 548
 549                 bzero(&mask, sizeof mask);
 550                 if (iflr->flags & IFLR_PREFIX) {
 551                         /* lookup a prefix rather than address. */
 552                         in_len2mask(&mask, iflr->prefixlen);
 553
 554                         sin = (struct sockaddr_in *)&iflr->addr;
 555                         match.s_addr = sin->sin_addr.s_addr;
 556                         match.s_addr &= mask.s_addr;
 557
 558                         /* if you set extra bits, that's wrong */
 559                         if (match.s_addr != sin->sin_addr.s_addr)
 560                                 return EINVAL;
 561
 562                         cmp = 1;
 563                 } else {
 564                         if (cmd == SIOCGLIFADDR) {
 565                                 /* on getting an address, take the 1st match */
 566                                 cmp = 0;        /*XXX*/
 567                         } else {
 568                                 /* on deleting an address, do exact match */
 569                                 in_len2mask(&mask, 32);
 570                                 sin = (struct sockaddr_in *)&iflr->addr;
 571                                 match.s_addr = sin->sin_addr.s_addr;
 572
 573                                 cmp = 1;
 574                         }
 575                 }
 576
 577                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 578                         if (ifa->ifa_addr->sa_family != AF_INET6)
 579                                 continue;
 580                         if (!cmp)
 581                                 break;
 582                         candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
 583                         candidate.s_addr &= mask.s_addr;
 584                         if (candidate.s_addr == match.s_addr)
 585                                 break;
 586                 }
 587                 if (!ifa)
 588                         return EADDRNOTAVAIL;
 589                 ia = (struct in_ifaddr *)ifa;
 590
 591                 if (cmd == SIOCGLIFADDR) {
 592                         /* fill in the if_laddrreq structure */
 593                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 594
 595                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 596                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 597                                         ia->ia_dstaddr.sin_len);
 598                         } else
 599                                 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
 600
 601                         iflr->prefixlen =
 602                                 in_mask2len(&ia->ia_sockmask.sin_addr);
 603
 604                         iflr->flags = 0;        /*XXX*/
 605
 606                         return 0;
 607                 } else {
 608                         struct in_aliasreq ifra;
 609
 610                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 611                         bzero(&ifra, sizeof ifra);
 612                         bcopy(iflr->iflr_name, ifra.ifra_name,
 613                                 sizeof ifra.ifra_name);
 614
 615                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 616                                 ia->ia_addr.sin_len);
 617                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 618                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 619                                         ia->ia_dstaddr.sin_len);
 620                         }
 621                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
 622                                 ia->ia_sockmask.sin_len);
 623
 624                         return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
 625                                           ifp, td);
 626                 }
 627             }
 628         }
 629
 630         return EOPNOTSUPP;      /*just for safety*/
 631 }
 632
 633 /*
 634  * Delete any existing route for an interface.
 635  */
 636 void
 637 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
 638 {
 639
 640         if ((ia->ia_flags & IFA_ROUTE) == 0)
 641                 return;
 642         if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
 643                 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
 644         else
 645                 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
 646         ia->ia_flags &= ~IFA_ROUTE;
 647 }
 648
 649 /*
 650  * Initialize an interface's internet address
 651  * and routing table entry.
 652  */
 653 static int
 654 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub)
 655 {
 656         u_long i = ntohl(sin->sin_addr.s_addr);
 657         struct sockaddr_in oldaddr;
 658         int flags = RTF_UP, error = 0;
 659
 660         lwkt_serialize_enter(ifp->if_serializer);
 661
 662         oldaddr = ia->ia_addr;
 663         if (oldaddr.sin_family == AF_INET)
 664                 LIST_REMOVE(ia, ia_hash);
 665         ia->ia_addr = *sin;
 666         if (ia->ia_addr.sin_family == AF_INET)
 667                 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 668                     ia, ia_hash);
 669         /*
 670          * Give the interface a chance to initialize
 671          * if this is its first address,
 672          * and to validate the address if necessary.
 673          */
 674         if (ifp->if_ioctl &&
 675             (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) {
 676                 lwkt_serialize_exit(ifp->if_serializer);
 677                 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
 678                 ia->ia_addr = oldaddr;
 679                 if (ia->ia_addr.sin_family == AF_INET)
 680                         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
 681                             ia, ia_hash);
 682                 return (error);
 683         }
 684         lwkt_serialize_exit(ifp->if_serializer);
 685         if (scrub) {
 686                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 687                 in_ifscrub(ifp, ia);
 688                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 689         }
 690         if (IN_CLASSA(i))
 691                 ia->ia_netmask = IN_CLASSA_NET;
 692         else if (IN_CLASSB(i))
 693                 ia->ia_netmask = IN_CLASSB_NET;
 694         else
 695                 ia->ia_netmask = IN_CLASSC_NET;
 696         /*
 697          * The subnet mask usually includes at least the standard network part,
 698          * but may may be smaller in the case of supernetting.
 699          * If it is set, we believe it.
 700          */
 701         if (ia->ia_subnetmask == 0) {
 702                 ia->ia_subnetmask = ia->ia_netmask;
 703                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
 704         } else
 705                 ia->ia_netmask &= ia->ia_subnetmask;
 706         ia->ia_net = i & ia->ia_netmask;
 707         ia->ia_subnet = i & ia->ia_subnetmask;
 708         in_socktrim(&ia->ia_sockmask);
 709         /*
 710          * Add route for the network.
 711          */
 712         ia->ia_ifa.ifa_metric = ifp->if_metric;
 713         if (ifp->if_flags & IFF_BROADCAST) {
 714                 ia->ia_broadaddr.sin_addr.s_addr =
 715                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
 716                 ia->ia_netbroadcast.s_addr =
 717                         htonl(ia->ia_net | ~ ia->ia_netmask);
 718         } else if (ifp->if_flags & IFF_LOOPBACK) {
 719                 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
 720                 flags |= RTF_HOST;
 721         } else if (ifp->if_flags & IFF_POINTOPOINT) {
 722                 if (ia->ia_dstaddr.sin_family != AF_INET)
 723                         return (0);
 724                 flags |= RTF_HOST;
 725         }
 726
 727         /*-
 728          * Don't add host routes for interface addresses of
 729          * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0.  This makes it
 730          * possible to assign several such address pairs with consistent
 731          * results (no host route) and is required by BOOTP.
 732          *
 733          * XXX: This is ugly !  There should be a way for the caller to
 734          *      say that they don't want a host route.
 735          */
 736         if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
 737             ia->ia_netmask != IN_CLASSA_NET ||
 738             ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
 739                 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) {
 740                         ia->ia_addr = oldaddr;
 741                         return (error);
 742                 }
 743                 ia->ia_flags |= IFA_ROUTE;
 744         }
 745
 746         /*
 747          * If the interface supports multicast, join the "all hosts"
 748          * multicast group on that interface.
 749          */
 750         if (ifp->if_flags & IFF_MULTICAST) {
 751                 struct in_addr addr;
 752
 753                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
 754                 in_addmulti(&addr, ifp);
 755         }
 756         return (error);
 757 }
 758
 759
 760 /*
 761  * Return 1 if the address might be a local broadcast address.
 762  */
 763 int
 764 in_broadcast(struct in_addr in, struct ifnet *ifp)
 765 {
 766         struct ifaddr *ifa;
 767         u_long t;
 768
 769         if (in.s_addr == INADDR_BROADCAST ||
 770             in.s_addr == INADDR_ANY)
 771                 return 1;
 772         if ((ifp->if_flags & IFF_BROADCAST) == 0)
 773                 return 0;
 774         t = ntohl(in.s_addr);
 775         /*
 776          * Look through the list of addresses for a match
 777          * with a broadcast address.
 778          */
 779 #define ia ((struct in_ifaddr *)ifa)
 780         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 781                 if (ifa->ifa_addr->sa_family == AF_INET &&
 782                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
 783                      in.s_addr == ia->ia_netbroadcast.s_addr ||
 784                      /*
 785                       * Check for old-style (host 0) broadcast.
 786                       */
 787                      t == ia->ia_subnet || t == ia->ia_net) &&
 788                      /*
 789                       * Check for an all one subnetmask. These
 790                       * only exist when an interface gets a secondary
 791                       * address.
 792                       */
 793                      ia->ia_subnetmask != (u_long)0xffffffff)
 794                             return 1;
 795         return (0);
 796 #undef ia
 797 }
 798 /*
 799  * Add an address to the list of IP multicast addresses for a given interface.
 800  */
 801 struct in_multi *
 802 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
 803 {
 804         struct in_multi *inm;
 805         int error;
 806         struct sockaddr_in sin;
 807         struct ifmultiaddr *ifma;
 808
 809         /*
 810          * Call generic routine to add membership or increment
 811          * refcount.  It wants addresses in the form of a sockaddr,
 812          * so we build one here (being careful to zero the unused bytes).
 813          */
 814         bzero(&sin, sizeof sin);
 815         sin.sin_family = AF_INET;
 816         sin.sin_len = sizeof sin;
 817         sin.sin_addr = *ap;
 818         crit_enter();
 819         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
 820         if (error) {
 821                 crit_exit();
 822                 return 0;
 823         }
 824
 825         /*
 826          * If ifma->ifma_protospec is null, then if_addmulti() created
 827          * a new record.  Otherwise, we are done.
 828          */
 829         if (ifma->ifma_protospec != 0) {
 830                 crit_exit();
 831                 return ifma->ifma_protospec;
 832         }
 833
 834         /* XXX - if_addmulti uses M_WAITOK.  Can this really be called
 835            at interrupt time?  If so, need to fix if_addmulti. XXX */
 836         inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
 837         inm->inm_addr = *ap;
 838         inm->inm_ifp = ifp;
 839         inm->inm_ifma = ifma;
 840         ifma->ifma_protospec = inm;
 841         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
 842
 843         /*
 844          * Let IGMP know that we have joined a new IP multicast group.
 845          */
 846         igmp_joingroup(inm);
 847         crit_exit();
 848         return (inm);
 849 }
 850
 851 /*
 852  * Delete a multicast address record.
 853  */
 854 void
 855 in_delmulti(struct in_multi *inm)
 856 {
 857         struct ifmultiaddr *ifma;
 858         struct in_multi my_inm;
 859
 860         crit_enter();
 861         ifma = inm->inm_ifma;
 862         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
 863         if (ifma->ifma_refcount == 1) {
 864                 /*
 865                  * No remaining claims to this record; let IGMP know that
 866                  * we are leaving the multicast group.
 867                  * But do it after the if_delmulti() which might reset
 868                  * the interface and nuke the packet.
 869                  */
 870                 my_inm = *inm ;
 871                 ifma->ifma_protospec = 0;
 872                 LIST_REMOVE(inm, inm_link);
 873                 kfree(inm, M_IPMADDR);
 874         }
 875         /* XXX - should be separate API for when we have an ifma? */
 876         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
 877         if (my_inm.inm_ifp != NULL)
 878                 igmp_leavegroup(&my_inm);
 879         crit_exit();
 880 }
 881
 882 void
 883 in_ifdetach(struct ifnet *ifp)
 884 {
 885         in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
 886         in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);
 887 }