gonzui

    1: /*      $NetBSD: in.c,v 1.127.4.3 2010/05/20 05:05:58 snj Exp $      */
    2: 
    3: /*
    4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5:  * All rights reserved.
    6:  *
    7:  * Redistribution and use in source and binary forms, with or without
    8:  * modification, are permitted provided that the following conditions
    9:  * are met:
   10:  * 1. Redistributions of source code must retain the above copyright
   11:  *    notice, this list of conditions and the following disclaimer.
   12:  * 2. Redistributions in binary form must reproduce the above copyright
   13:  *    notice, this list of conditions and the following disclaimer in the
   14:  *    documentation and/or other materials provided with the distribution.
   15:  * 3. Neither the name of the project nor the names of its contributors
   16:  *    may be used to endorse or promote products derived from this software
   17:  *    without specific prior written permission.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  */
   31: 
   32: /*-
   33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   34:  * All rights reserved.
   35:  *
   36:  * This code is derived from software contributed to The NetBSD Foundation
   37:  * by Public Access Networks Corporation ("Panix").  It was developed under
   38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
   39:  *
   40:  * Redistribution and use in source and binary forms, with or without
   41:  * modification, are permitted provided that the following conditions
   42:  * are met:
   43:  * 1. Redistributions of source code must retain the above copyright
   44:  *    notice, this list of conditions and the following disclaimer.
   45:  * 2. Redistributions in binary form must reproduce the above copyright
   46:  *    notice, this list of conditions and the following disclaimer in the
   47:  *    documentation and/or other materials provided with the distribution.
   48:  *
   49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   59:  * POSSIBILITY OF SUCH DAMAGE.
   60:  */
   61: 
   62: /*
   63:  * Copyright (c) 1982, 1986, 1991, 1993
   64:  *      The Regents of the University of California.  All rights reserved.
   65:  *
   66:  * Redistribution and use in source and binary forms, with or without
   67:  * modification, are permitted provided that the following conditions
   68:  * are met:
   69:  * 1. Redistributions of source code must retain the above copyright
   70:  *    notice, this list of conditions and the following disclaimer.
   71:  * 2. Redistributions in binary form must reproduce the above copyright
   72:  *    notice, this list of conditions and the following disclaimer in the
   73:  *    documentation and/or other materials provided with the distribution.
   74:  * 3. Neither the name of the University nor the names of its contributors
   75:  *    may be used to endorse or promote products derived from this software
   76:  *    without specific prior written permission.
   77:  *
   78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   88:  * SUCH DAMAGE.
   89:  *
   90:  *      @(#)in.c     8.4 (Berkeley) 1/9/95
   91:  */
   92: 
   93: #include <sys/cdefs.h>
   94: __KERNEL_RCSID(0, "$NetBSD: in.c,v 1.127.4.3 2010/05/20 05:05:58 snj Exp $");
   95: 
   96: #include "opt_inet.h"
   97: #include "opt_inet_conf.h"
   98: #ifndef T2EX
   99: #include "opt_mrouting.h"
  100: #include "opt_pfil_hooks.h"
  101: #endif
  102: 
  103: #include <sys/param.h>
  104: #include <sys/ioctl.h>
  105: #include <sys/errno.h>
  106: #include <sys/malloc.h>
  107: #include <sys/socket.h>
  108: #include <sys/socketvar.h>
  109: #include <sys/sysctl.h>
  110: #include <sys/systm.h>
  111: #include <sys/proc.h>
  112: #include <sys/syslog.h>
  113: #ifndef T2EX
  114: #include <sys/kauth.h>
  115: #endif
  116: 
  117: #include <net/if.h>
  118: #include <net/route.h>
  119: 
  120: #include <net/if_ether.h>
  121: 
  122: #include <netinet/in_systm.h>
  123: #include <netinet/in.h>
  124: #include <netinet/in_var.h>
  125: #include <netinet/ip.h>
  126: #include <netinet/ip_var.h>
  127: #include <netinet/in_ifattach.h>
  128: #include <netinet/in_pcb.h>
  129: #include <netinet/if_inarp.h>
  130: #include <netinet/ip_mroute.h>
  131: #include <netinet/igmp_var.h>
  132: 
  133: #ifdef IPSELSRC
  134: #include <netinet/in_selsrc.h>
  135: #endif
  136: 
  137: #ifdef PFIL_HOOKS
  138: #include <net/pfil.h>
  139: #endif
  140: 
  141: static u_int in_mask2len(struct in_addr *);
  142: static void in_len2mask(struct in_addr *, u_int);
  143: static int in_lifaddr_ioctl(struct socket *, u_long, void *,
  144:         struct ifnet *, struct lwp *);
  145: 
  146: static int in_ifaddrpref_ioctl(struct socket *, u_long, void *,
  147:         struct ifnet *);
  148: static int in_addprefix(struct in_ifaddr *, int);
  149: static int in_scrubprefix(struct in_ifaddr *);
  150: 
  151: #ifndef SUBNETSARELOCAL
  152: #define SUBNETSARELOCAL 1
  153: #endif
  154: 
  155: #ifndef HOSTZEROBROADCAST
  156: #define HOSTZEROBROADCAST 1
  157: #endif
  158: 
  159: int subnetsarelocal = SUBNETSARELOCAL;
  160: int hostzeroisbroadcast = HOSTZEROBROADCAST;
  161: 
  162: /*
  163:  * This list is used to keep track of in_multi chains which belong to
  164:  * deleted interface addresses.  We use in_ifaddr so that a chain head
  165:  * won't be deallocated until all multicast address record are deleted.
  166:  */
  167: static TAILQ_HEAD(, in_ifaddr) in_mk = TAILQ_HEAD_INITIALIZER(in_mk);
  168: 
  169: /*
  170:  * Return 1 if an internet address is for a ``local'' host
  171:  * (one to which we have a connection).  If subnetsarelocal
  172:  * is true, this includes other subnets of the local net.
  173:  * Otherwise, it includes only the directly-connected (sub)nets.
  174:  */
  175: int
  176: in_localaddr(struct in_addr in)
  177: {
  178:         struct in_ifaddr *ia;
  179: 
  180:         if (subnetsarelocal) {
  181:                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list)
  182:                         if ((in.s_addr & ia->ia_netmask) == ia->ia_net)
  183:                                 return (1);
  184:         } else {
  185:                 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list)
  186:                         if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet)
  187:                                 return (1);
  188:         }
  189:         return (0);
  190: }
  191: 
  192: /*
  193:  * Determine whether an IP address is in a reserved set of addresses
  194:  * that may not be forwarded, or whether datagrams to that destination
  195:  * may be forwarded.
  196:  */
  197: int
  198: in_canforward(struct in_addr in)
  199: {
  200:         u_int32_t net;
  201: 
  202:         if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr))
  203:                 return (0);
  204:         if (IN_CLASSA(in.s_addr)) {
  205:                 net = in.s_addr & IN_CLASSA_NET;
  206:                 if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
  207:                         return (0);
  208:         }
  209:         return (1);
  210: }
  211: 
  212: /*
  213:  * Trim a mask in a sockaddr
  214:  */
  215: void
  216: in_socktrim(struct sockaddr_in *ap)
  217: {
  218:         char *cplim = (char *) &ap->sin_addr;
  219:         char *cp = (char *) (&ap->sin_addr + 1);
  220: 
  221:         ap->sin_len = 0;
  222:         while (--cp >= cplim)
  223:                 if (*cp) {
  224:                         (ap)->sin_len = cp - (char *) (ap) + 1;
  225:                         break;
  226:                 }
  227: }
  228: 
  229: /*
  230:  *  Routine to take an Internet address and convert into a
  231:  *  "dotted quad" representation for printing.
  232:  */
  233: const char *
  234: in_fmtaddr(struct in_addr addr)
  235: {
  236:         static char buf[sizeof("123.456.789.123")];
  237: 
  238:         addr.s_addr = ntohl(addr.s_addr);
  239: 
  240:         snprintf(buf, sizeof(buf), "%d.%d.%d.%d",
  241:                 (addr.s_addr >> 24) & 0xFF,
  242:                 (addr.s_addr >> 16) & 0xFF,
  243:                 (addr.s_addr >>  8) & 0xFF,
  244:                 (addr.s_addr >>  0) & 0xFF);
  245:         return buf;
  246: }
  247: 
  248: /*
  249:  * Maintain the "in_maxmtu" variable, which is the largest
  250:  * mtu for non-local interfaces with AF_INET addresses assigned
  251:  * to them that are up.
  252:  */
  253: unsigned long in_maxmtu;
  254: 
  255: void
  256: in_setmaxmtu(void)
  257: {
  258:         struct in_ifaddr *ia;
  259:         struct ifnet *ifp;
  260:         unsigned long maxmtu = 0;
  261: 
  262:         TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) {
  263:                 if ((ifp = ia->ia_ifp) == 0)
  264:                         continue;
  265:                 if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP)
  266:                         continue;
  267:                 if (ifp->if_mtu > maxmtu)
  268:                         maxmtu = ifp->if_mtu;
  269:         }
  270:         if (maxmtu)
  271:                 in_maxmtu = maxmtu;
  272: }
  273: 
  274: static u_int
  275: in_mask2len(struct in_addr *mask)
  276: {
  277:         u_int x, y;
  278:         u_char *p;
  279: 
  280:         p = (u_char *)mask;
  281:         for (x = 0; x < sizeof(*mask); x++) {
  282:                 if (p[x] != 0xff)
  283:                         break;
  284:         }
  285:         y = 0;
  286:         if (x < sizeof(*mask)) {
  287:                 for (y = 0; y < NBBY; y++) {
  288:                         if ((p[x] & (0x80 >> y)) == 0)
  289:                                 break;
  290:                 }
  291:         }
  292:         return x * NBBY + y;
  293: }
  294: 
  295: static void
  296: in_len2mask(struct in_addr *mask, u_int len)
  297: {
  298:         u_int i;
  299:         u_char *p;
  300: 
  301:         p = (u_char *)mask;
  302:         bzero(mask, sizeof(*mask));
  303:         for (i = 0; i < len / NBBY; i++)
  304:                 p[i] = 0xff;
  305:         if (len % NBBY)
  306:                 p[i] = (0xff00 >> (len % NBBY)) & 0xff;
  307: }
  308: 
  309: /*
  310:  * Generic internet control operations (ioctl's).
  311:  * Ifp is 0 if not an interface-specific ioctl.
  312:  */
  313: /* ARGSUSED */
  314: int
  315: in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
  316:     struct lwp *l)
  317: {
  318:         struct ifreq *ifr = (struct ifreq *)data;
  319:         struct in_ifaddr *ia = 0;
  320:         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
  321:         struct sockaddr_in oldaddr;
  322:         int error, hostIsNew, maskIsNew;
  323:         int newifaddr = 0;
  324: 
  325:         switch (cmd) {
  326:         case SIOCALIFADDR:
  327:         case SIOCDLIFADDR:
  328:         case SIOCSIFADDRPREF:
  329:                 if (l == NULL)
  330:                         return (EPERM);
  331: #ifndef T2EX /* no test for super-user credential */
  332:                 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
  333:                     KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
  334:                     NULL) != 0)
  335:                         return (EPERM);
  336: #endif
  337:                 /*FALLTHROUGH*/
  338:         case SIOCGIFADDRPREF:
  339:         case SIOCGLIFADDR:
  340:                 if (ifp == NULL)
  341:                         return EINVAL;
  342:                 if (cmd == SIOCGIFADDRPREF || cmd == SIOCSIFADDRPREF)
  343:                         return in_ifaddrpref_ioctl(so, cmd, data, ifp);
  344:                 else
  345:                         return in_lifaddr_ioctl(so, cmd, data, ifp, l);
  346:         }
  347: 
  348:         /*
  349:          * Find address for this interface, if it exists.
  350:          */
  351:         if (ifp != NULL)
  352:                 IFP_TO_IA(ifp, ia);
  353: 
  354:         switch (cmd) {
  355: 
  356:         case SIOCAIFADDR:
  357:         case SIOCDIFADDR:
  358:         case SIOCGIFALIAS:
  359:                 if (ifra->ifra_addr.sin_family == AF_INET)
  360:                         LIST_FOREACH(ia,
  361:                             &IN_IFADDR_HASH(ifra->ifra_addr.sin_addr.s_addr),
  362:                             ia_hash) {
  363:                                 if (ia->ia_ifp == ifp &&
  364:                                     in_hosteq(ia->ia_addr.sin_addr,
  365:                                     ifra->ifra_addr.sin_addr))
  366:                                         break;
  367:                         }
  368:                 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL)
  369:                         return (EADDRNOTAVAIL);
  370: 
  371: #if 1 /*def COMPAT_43*/
  372:                 if (cmd == SIOCDIFADDR &&
  373:                     ifra->ifra_addr.sin_family == AF_UNSPEC) {
  374:                         ifra->ifra_addr.sin_family = AF_INET;
  375:                 }
  376: #endif
  377:                 /* FALLTHROUGH */
  378:         case SIOCSIFADDR:
  379:         case SIOCSIFDSTADDR:
  380:                 if (ifra->ifra_addr.sin_family != AF_INET)
  381:                         return (EAFNOSUPPORT);
  382:                 /* FALLTHROUGH */
  383:         case SIOCSIFNETMASK:
  384:                 if (ifp == NULL)
  385:                         panic("in_control");
  386: 
  387:                 if (cmd == SIOCGIFALIAS)
  388:                         break;
  389: 
  390:                 if (ia == NULL &&
  391:                     (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR))
  392:                         return (EADDRNOTAVAIL);
  393: 
  394:                 if (l == NULL)
  395:                         return (EPERM);
  396: #ifndef T2EX /* no test for super-user credential */
  397:                 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
  398:                     KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
  399:                     NULL) != 0)
  400:                         return (EPERM);
  401: #endif
  402: 
  403:                 if (ia == 0) {
  404:                         MALLOC(ia, struct in_ifaddr *, sizeof(*ia),
  405:                                M_IFADDR, M_WAITOK);
  406:                         if (ia == 0)
  407:                                 return (ENOBUFS);
  408:                         bzero((void *)ia, sizeof *ia);
  409:                         TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list);
  410:                         IFAREF(&ia->ia_ifa);
  411:                         ifa_insert(ifp, &ia->ia_ifa);
  412:                         ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
  413:                         ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
  414:                         ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask);
  415: #ifdef IPSELSRC
  416:                         ia->ia_ifa.ifa_getifa = in_getifa;
  417: #else /* IPSELSRC */
  418:                         ia->ia_ifa.ifa_getifa = NULL;
  419: #endif /* IPSELSRC */
  420:                         ia->ia_sockmask.sin_len = 8;
  421:                         if (ifp->if_flags & IFF_BROADCAST) {
  422:                                 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
  423:                                 ia->ia_broadaddr.sin_family = AF_INET;
  424:                         }
  425:                         ia->ia_ifp = ifp;
  426:                         ia->ia_idsalt = arc4random() % 65535;
  427:                         LIST_INIT(&ia->ia_multiaddrs);
  428:                         newifaddr = 1;
  429:                 }
  430:                 break;
  431: 
  432:         case SIOCSIFBRDADDR:
  433:                 if (l == NULL)
  434:                         return (EPERM);
  435: #ifndef T2EX /* no test for super-user credential */
  436:                 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
  437:                     KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
  438:                     NULL) != 0)
  439:                         return (EPERM);
  440: #endif
  441:                 /* FALLTHROUGH */
  442: 
  443:         case SIOCGIFADDR:
  444:         case SIOCGIFNETMASK:
  445:         case SIOCGIFDSTADDR:
  446:         case SIOCGIFBRDADDR:
  447:                 if (ia == 0)
  448:                         return (EADDRNOTAVAIL);
  449:                 break;
  450:         }
  451:         error = 0;
  452:         switch (cmd) {
  453: 
  454:         case SIOCGIFADDR:
  455:                 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr));
  456:                 break;
  457: 
  458:         case SIOCGIFBRDADDR:
  459:                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  460:                         return (EINVAL);
  461:                 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr));
  462:                 break;
  463: 
  464:         case SIOCGIFDSTADDR:
  465:                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  466:                         return (EINVAL);
  467:                 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr));
  468:                 break;
  469: 
  470:         case SIOCGIFNETMASK:
  471:                 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_sockmask));
  472:                 break;
  473: 
  474:         case SIOCSIFDSTADDR:
  475:                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  476:                         return (EINVAL);
  477:                 oldaddr = ia->ia_dstaddr;
  478:                 ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr));
  479:                 if (ifp->if_ioctl != NULL &&
  480:                     (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
  481:                                               (void *)ia)) != 0) {
  482:                         ia->ia_dstaddr = oldaddr;
  483:                         return error;
  484:                 }
  485:                 if (ia->ia_flags & IFA_ROUTE) {
  486:                         ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr);
  487:                         rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
  488:                         ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
  489:                         rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP);
  490:                 }
  491:                 break;
  492: 
  493:         case SIOCSIFBRDADDR:
  494:                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  495:                         return EINVAL;
  496:                 ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr));
  497:                 break;
  498: 
  499:         case SIOCSIFADDR:
  500:                 error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)),
  501:                     1);
  502: #ifdef PFIL_HOOKS
  503:                 if (error == 0)
  504:                         (void)pfil_run_hooks(&if_pfil,
  505:                             (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR);
  506: #endif
  507:                 break;
  508: 
  509:         case SIOCSIFNETMASK:
  510:                 in_ifscrub(ifp, ia);
  511:                 ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr));
  512:                 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr;
  513:                 error = in_ifinit(ifp, ia, NULL, 0);
  514:                 break;
  515: 
  516:         case SIOCAIFADDR:
  517:                 maskIsNew = 0;
  518:                 hostIsNew = 1;
  519:                 if (ia->ia_addr.sin_family != AF_INET)
  520:                         ;
  521:                 else if (ifra->ifra_addr.sin_len == 0) {
  522:                         ifra->ifra_addr = ia->ia_addr;
  523:                         hostIsNew = 0;
  524:                 } else if (in_hosteq(ia->ia_addr.sin_addr,
  525:                            ifra->ifra_addr.sin_addr))
  526:                         hostIsNew = 0;
  527:                 if (ifra->ifra_mask.sin_len) {
  528:                         in_ifscrub(ifp, ia);
  529:                         ia->ia_sockmask = ifra->ifra_mask;
  530:                         ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr;
  531:                         maskIsNew = 1;
  532:                 }
  533:                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  534:                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
  535:                         in_ifscrub(ifp, ia);
  536:                         ia->ia_dstaddr = ifra->ifra_dstaddr;
  537:                         maskIsNew  = 1; /* We lie; but the effect's the same */
  538:                 }
  539:                 if (ifra->ifra_addr.sin_family == AF_INET &&
  540:                     (hostIsNew || maskIsNew)) {
  541:                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
  542:                 }
  543:                 if ((ifp->if_flags & IFF_BROADCAST) &&
  544:                     (ifra->ifra_broadaddr.sin_family == AF_INET))
  545:                         ia->ia_broadaddr = ifra->ifra_broadaddr;
  546: #ifdef PFIL_HOOKS
  547:                 if (error == 0)
  548:                         (void)pfil_run_hooks(&if_pfil,
  549:                             (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR);
  550: #endif
  551:                 break;
  552: 
  553:         case SIOCGIFALIAS:
  554:                 ifra->ifra_mask = ia->ia_sockmask;
  555:                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  556:                     (ia->ia_dstaddr.sin_family == AF_INET))
  557:                         ifra->ifra_dstaddr = ia->ia_dstaddr;
  558:                 else if ((ifp->if_flags & IFF_BROADCAST) &&
  559:                     (ia->ia_broadaddr.sin_family == AF_INET))
  560:                         ifra->ifra_broadaddr = ia->ia_broadaddr;
  561:                 else
  562:                         memset(&ifra->ifra_broadaddr, 0,
  563:                               sizeof(ifra->ifra_broadaddr));
  564:                 break;
  565: 
  566:         case SIOCDIFADDR:
  567:                 in_purgeaddr(&ia->ia_ifa);
  568: #ifdef PFIL_HOOKS
  569:                 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR,
  570:                     ifp, PFIL_IFADDR);
  571: #endif
  572:                 break;
  573: 
  574: #ifdef MROUTING
  575:         case SIOCGETVIFCNT:
  576:         case SIOCGETSGCNT:
  577:                 error = mrt_ioctl(so, cmd, data);
  578:                 break;
  579: #endif /* MROUTING */
  580: 
  581:         default:
  582:                 if (ifp == NULL || ifp->if_ioctl == NULL)
  583:                         return EOPNOTSUPP;
  584:                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  585:                 in_setmaxmtu();
  586:                 break;
  587:         }
  588: 
  589:         if (error != 0 && newifaddr) {
  590:                 KASSERT(ia != NULL);
  591:                 in_purgeaddr(&ia->ia_ifa);
  592:         }
  593: 
  594:         return error;
  595: }
  596: 
  597: void
  598: in_purgeaddr(struct ifaddr *ifa)
  599: {
  600:         struct ifnet *ifp = ifa->ifa_ifp;
  601:         struct in_ifaddr *ia = (void *) ifa;
  602: 
  603:         in_ifscrub(ifp, ia);
  604:         LIST_REMOVE(ia, ia_hash);
  605:         ifa_remove(ifp, &ia->ia_ifa);
  606:         TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list);
  607:         if (ia->ia_allhosts != NULL)
  608:                 in_delmulti(ia->ia_allhosts);
  609:         IFAFREE(&ia->ia_ifa);
  610:         in_setmaxmtu();
  611: }
  612: 
  613: void
  614: in_purgeif(struct ifnet *ifp)           /* MUST be called at splsoftnet() */
  615: {
  616:         if_purgeaddrs(ifp, AF_INET, in_purgeaddr);
  617:         igmp_purgeif(ifp);             /* manipulates pools */
  618: #ifdef MROUTING
  619:         ip_mrouter_detach(ifp);
  620: #endif
  621: }
  622: 
  623: /*
  624:  * SIOC[GAD]LIFADDR.
  625:  *      SIOCGLIFADDR: get first address. (???)
  626:  *      SIOCGLIFADDR with IFLR_PREFIX:
  627:  *              get first address that matches the specified prefix.
  628:  *      SIOCALIFADDR: add the specified address.
  629:  *      SIOCALIFADDR with IFLR_PREFIX:
  630:  *              EINVAL since we can't deduce hostid part of the address.
  631:  *      SIOCDLIFADDR: delete the specified address.
  632:  *      SIOCDLIFADDR with IFLR_PREFIX:
  633:  *              delete the first address that matches the specified prefix.
  634:  * return values:
  635:  *      EINVAL on invalid parameters
  636:  *      EADDRNOTAVAIL on prefix match failed/specified address not found
  637:  *      other values may be returned from in_ioctl()
  638:  */
  639: static int
  640: in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data,
  641:     struct ifnet *ifp, struct lwp *l)
  642: {
  643:         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
  644:         struct ifaddr *ifa;
  645:         struct sockaddr *sa;
  646: 
  647:         /* sanity checks */
  648:         if (data == NULL || ifp == NULL) {
  649:                 panic("invalid argument to in_lifaddr_ioctl");
  650:                 /*NOTRECHED*/
  651:         }
  652: 
  653:         switch (cmd) {
  654:         case SIOCGLIFADDR:
  655:                 /* address must be specified on GET with IFLR_PREFIX */
  656:                 if ((iflr->flags & IFLR_PREFIX) == 0)
  657:                         break;
  658:                 /*FALLTHROUGH*/
  659:         case SIOCALIFADDR:
  660:         case SIOCDLIFADDR:
  661:                 /* address must be specified on ADD and DELETE */
  662:                 sa = (struct sockaddr *)&iflr->addr;
  663:                 if (sa->sa_family != AF_INET)
  664:                         return EINVAL;
  665:                 if (sa->sa_len != sizeof(struct sockaddr_in))
  666:                         return EINVAL;
  667:                 /* XXX need improvement */
  668:                 sa = (struct sockaddr *)&iflr->dstaddr;
  669:                 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
  670:                         return EINVAL;
  671:                 if (sa->sa_len != 0 && sa->sa_len != sizeof(struct sockaddr_in))
  672:                         return EINVAL;
  673:                 break;
  674:         default: /*shouldn't happen*/
  675: #if 0
  676:                 panic("invalid cmd to in_lifaddr_ioctl");
  677:                 /*NOTREACHED*/
  678: #else
  679:                 return EOPNOTSUPP;
  680: #endif
  681:         }
  682:         if (sizeof(struct in_addr) * NBBY < iflr->prefixlen)
  683:                 return EINVAL;
  684: 
  685:         switch (cmd) {
  686:         case SIOCALIFADDR:
  687:             {
  688:                 struct in_aliasreq ifra;
  689: 
  690:                 if (iflr->flags & IFLR_PREFIX)
  691:                         return EINVAL;
  692: 
  693:                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */
  694:                 bzero(&ifra, sizeof(ifra));
  695:                 bcopy(iflr->iflr_name, ifra.ifra_name,
  696:                         sizeof(ifra.ifra_name));
  697: 
  698:                 bcopy(&iflr->addr, &ifra.ifra_addr,
  699:                         ((struct sockaddr *)&iflr->addr)->sa_len);
  700: 
  701:                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/
  702:                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
  703:                                 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
  704:                 }
  705: 
  706:                 ifra.ifra_mask.sin_family = AF_INET;
  707:                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
  708:                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
  709: 
  710:                 return in_control(so, SIOCAIFADDR, (void *)&ifra, ifp, l);
  711:             }
  712:         case SIOCGLIFADDR:
  713:         case SIOCDLIFADDR:
  714:             {
  715:                 struct in_ifaddr *ia;
  716:                 struct in_addr mask, candidate, match;
  717:                 struct sockaddr_in *sin;
  718:                 int cmp;
  719: 
  720:                 bzero(&mask, sizeof(mask));
  721:                 bzero(&match, sizeof(match)); /* XXX gcc */
  722:                 if (iflr->flags & IFLR_PREFIX) {
  723:                         /* lookup a prefix rather than address. */
  724:                         in_len2mask(&mask, iflr->prefixlen);
  725: 
  726:                         sin = (struct sockaddr_in *)&iflr->addr;
  727:                         match.s_addr = sin->sin_addr.s_addr;
  728:                         match.s_addr &= mask.s_addr;
  729: 
  730:                         /* if you set extra bits, that's wrong */
  731:                         if (match.s_addr != sin->sin_addr.s_addr)
  732:                                 return EINVAL;
  733: 
  734:                         cmp = 1;
  735:                 } else {
  736:                         if (cmd == SIOCGLIFADDR) {
  737:                                 /* on getting an address, take the 1st match */
  738:                                 cmp = 0;    /*XXX*/
  739:                         } else {
  740:                                 /* on deleting an address, do exact match */
  741:                                 in_len2mask(&mask, 32);
  742:                                 sin = (struct sockaddr_in *)&iflr->addr;
  743:                                 match.s_addr = sin->sin_addr.s_addr;
  744: 
  745:                                 cmp = 1;
  746:                         }
  747:                 }
  748: 
  749:                 IFADDR_FOREACH(ifa, ifp) {
  750:                         if (ifa->ifa_addr->sa_family != AF_INET)
  751:                                 continue;
  752:                         if (cmp == 0)
  753:                                 break;
  754:                         candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
  755:                         candidate.s_addr &= mask.s_addr;
  756:                         if (candidate.s_addr == match.s_addr)
  757:                                 break;
  758:                 }
  759:                 if (ifa == NULL)
  760:                         return EADDRNOTAVAIL;
  761:                 ia = (struct in_ifaddr *)ifa;
  762: 
  763:                 if (cmd == SIOCGLIFADDR) {
  764:                         /* fill in the if_laddrreq structure */
  765:                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
  766: 
  767:                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
  768:                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
  769:                                         ia->ia_dstaddr.sin_len);
  770:                         } else
  771:                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
  772: 
  773:                         iflr->prefixlen =
  774:                                 in_mask2len(&ia->ia_sockmask.sin_addr);
  775: 
  776:                         iflr->flags = 0;     /*XXX*/
  777: 
  778:                         return 0;
  779:                 } else {
  780:                         struct in_aliasreq ifra;
  781: 
  782:                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */
  783:                         bzero(&ifra, sizeof(ifra));
  784:                         bcopy(iflr->iflr_name, ifra.ifra_name,
  785:                                 sizeof(ifra.ifra_name));
  786: 
  787:                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
  788:                                 ia->ia_addr.sin_len);
  789:                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
  790:                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
  791:                                         ia->ia_dstaddr.sin_len);
  792:                         }
  793:                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
  794:                                 ia->ia_sockmask.sin_len);
  795: 
  796:                         return in_control(so, SIOCDIFADDR, (void *)&ifra,
  797:                                 ifp, l);
  798:                 }
  799:             }
  800:         }
  801: 
  802:         return EOPNOTSUPP;     /*just for safety*/
  803: }
  804: 
  805: static int
  806: in_ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data,
  807:     struct ifnet *ifp)
  808: {
  809:         struct if_addrprefreq *ifap = (struct if_addrprefreq *)data;
  810:         struct ifaddr *ifa;
  811:         struct sockaddr *sa;
  812:         struct in_ifaddr *ia = NULL; /* appease gcc -Wuninitialized */
  813:         struct in_addr match;
  814:         struct sockaddr_in *sin;
  815: 
  816:         /* sanity checks */
  817:         if (data == NULL || ifp == NULL) {
  818:                 panic("invalid argument to %s", __func__);
  819:                 /*NOTREACHED*/
  820:         }
  821: 
  822:         /* address must be specified on ADD and DELETE */
  823:         sa = (struct sockaddr *)&ifap->ifap_addr;
  824:         if (sa->sa_family != AF_INET)
  825:                 return EINVAL;
  826:         if (sa->sa_len != sizeof(struct sockaddr_in))
  827:                 return EINVAL;
  828: 
  829:         switch (cmd) {
  830:         case SIOCSIFADDRPREF:
  831:         case SIOCGIFADDRPREF:
  832:                 break;
  833:         default:
  834:                 return EOPNOTSUPP;
  835:         }
  836: 
  837:         sin = (struct sockaddr_in *)&ifap->ifap_addr;
  838:         match.s_addr = sin->sin_addr.s_addr;
  839: 
  840:         IFADDR_FOREACH(ifa, ifp) {
  841:                 ia = (struct in_ifaddr *)ifa;
  842:                 if (ia->ia_addr.sin_family != AF_INET)
  843:                         continue;
  844:                 if (ia->ia_addr.sin_addr.s_addr == match.s_addr)
  845:                         break;
  846:         }
  847:         if (ifa == NULL)
  848:                 return EADDRNOTAVAIL;
  849: 
  850:         switch (cmd) {
  851:         case SIOCSIFADDRPREF:
  852:                 ifa->ifa_preference = ifap->ifap_preference;
  853:                 return 0;
  854:         case SIOCGIFADDRPREF:
  855:                 /* fill in the if_laddrreq structure */
  856:                 (void)memcpy(&ifap->ifap_addr, &ia->ia_addr,
  857:                     ia->ia_addr.sin_len);
  858:                 ifap->ifap_preference = ifa->ifa_preference;
  859:                 return 0;
  860:         default:
  861:                 return EOPNOTSUPP;
  862:         }
  863: }
  864: 
  865: /*
  866:  * Delete any existing route for an interface.
  867:  */
  868: void
  869: in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
  870: {
  871: 
  872:         in_scrubprefix(ia);
  873: }
  874: 
  875: /*
  876:  * Initialize an interface's internet address
  877:  * and routing table entry.
  878:  */
  879: int
  880: in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
  881:     const struct sockaddr_in *sin, int scrub)
  882: {
  883:         u_int32_t i;
  884:         struct sockaddr_in oldaddr;
  885:         int s = splnet(), flags = RTF_UP, error;
  886: 
  887:         if (sin == NULL)
  888:                 sin = &ia->ia_addr;
  889: 
  890:         /*
  891:          * Set up new addresses.
  892:          */
  893:         oldaddr = ia->ia_addr;
  894:         if (ia->ia_addr.sin_family == AF_INET)
  895:                 LIST_REMOVE(ia, ia_hash);
  896:         ia->ia_addr = *sin;
  897:         LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
  898: 
  899:         /*
  900:          * Give the interface a chance to initialize
  901:          * if this is its first address,
  902:          * and to validate the address if necessary.
  903:          */
  904:         if (ifp->if_ioctl &&
  905:             (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (void *)ia)))
  906:                 goto bad;
  907:         splx(s);
  908:         if (scrub) {
  909:                 ia->ia_ifa.ifa_addr = sintosa(&oldaddr);
  910:                 in_ifscrub(ifp, ia);
  911:                 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
  912:         }
  913: 
  914:         i = ia->ia_addr.sin_addr.s_addr;
  915:         if (IN_CLASSA(i))
  916:                 ia->ia_netmask = IN_CLASSA_NET;
  917:         else if (IN_CLASSB(i))
  918:                 ia->ia_netmask = IN_CLASSB_NET;
  919:         else
  920:                 ia->ia_netmask = IN_CLASSC_NET;
  921:         /*
  922:          * The subnet mask usually includes at least the standard network part,
  923:          * but may may be smaller in the case of supernetting.
  924:          * If it is set, we believe it.
  925:          */
  926:         if (ia->ia_subnetmask == 0) {
  927:                 ia->ia_subnetmask = ia->ia_netmask;
  928:                 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask;
  929:         } else
  930:                 ia->ia_netmask &= ia->ia_subnetmask;
  931: 
  932:         ia->ia_net = i & ia->ia_netmask;
  933:         ia->ia_subnet = i & ia->ia_subnetmask;
  934:         in_socktrim(&ia->ia_sockmask);
  935:         /* re-calculate the "in_maxmtu" value */
  936:         in_setmaxmtu();
  937:         /*
  938:          * Add route for the network.
  939:          */
  940:         ia->ia_ifa.ifa_metric = ifp->if_metric;
  941:         if (ifp->if_flags & IFF_BROADCAST) {
  942:                 ia->ia_broadaddr.sin_addr.s_addr =
  943:                         ia->ia_subnet | ~ia->ia_subnetmask;
  944:                 ia->ia_netbroadcast.s_addr =
  945:                         ia->ia_net | ~ia->ia_netmask;
  946:         } else if (ifp->if_flags & IFF_LOOPBACK) {
  947:                 ia->ia_dstaddr = ia->ia_addr;
  948:                 flags |= RTF_HOST;
  949:         } else if (ifp->if_flags & IFF_POINTOPOINT) {
  950:                 if (ia->ia_dstaddr.sin_family != AF_INET)
  951:                         return (0);
  952:                 flags |= RTF_HOST;
  953:         }
  954:         error = in_addprefix(ia, flags);
  955:         /*
  956:          * If the interface supports multicast, join the "all hosts"
  957:          * multicast group on that interface.
  958:          */
  959:         if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) {
  960:                 struct in_addr addr;
  961: 
  962:                 addr.s_addr = INADDR_ALLHOSTS_GROUP;
  963:                 ia->ia_allhosts = in_addmulti(&addr, ifp);
  964:         }
  965:         return (error);
  966: bad:
  967:         splx(s);
  968:         LIST_REMOVE(ia, ia_hash);
  969:         ia->ia_addr = oldaddr;
  970:         if (ia->ia_addr.sin_family == AF_INET)
  971:                 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr),
  972:                     ia, ia_hash);
  973:         return (error);
  974: }
  975: 
  976: #define rtinitflags(x) \
  977:         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
  978:             ? RTF_HOST : 0)
  979: 
  980: /*
  981:  * add a route to prefix ("connected route" in cisco terminology).
  982:  * does nothing if there's some interface address with the same prefix already.
  983:  */
  984: static int
  985: in_addprefix(struct in_ifaddr *target, int flags)
  986: {
  987:         struct in_ifaddr *ia;
  988:         struct in_addr prefix, mask, p;
  989:         int error;
  990: 
  991:         if ((flags & RTF_HOST) != 0)
  992:                 prefix = target->ia_dstaddr.sin_addr;
  993:         else {
  994:                 prefix = target->ia_addr.sin_addr;
  995:                 mask = target->ia_sockmask.sin_addr;
  996:                 prefix.s_addr &= mask.s_addr;
  997:         }
  998: 
  999:         TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) {
 1000:                 if (rtinitflags(ia))
 1001:                         p = ia->ia_dstaddr.sin_addr;
 1002:                 else {
 1003:                         p = ia->ia_addr.sin_addr;
 1004:                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
 1005:                 }
 1006: 
 1007:                 if (prefix.s_addr != p.s_addr)
 1008:                         continue;
 1009: 
 1010:                 /*
 1011:                  * if we got a matching prefix route inserted by other
 1012:                  * interface address, we don't need to bother
 1013:                  *
 1014:                  * XXX RADIX_MPATH implications here? -dyoung
 1015:                  */
 1016:                 if (ia->ia_flags & IFA_ROUTE)
 1017:                         return 0;
 1018:         }
 1019: 
 1020:         /*
 1021:          * noone seem to have prefix route.  insert it.
 1022:          */
 1023:         error = rtinit(&target->ia_ifa, RTM_ADD, flags);
 1024:         if (error == 0)
 1025:                 target->ia_flags |= IFA_ROUTE;
 1026:         else if (error == EEXIST) {
 1027:                 /* 
 1028:                  * the fact the route already exists is not an error.
 1029:                  */ 
 1030:                 error = 0;
 1031:         }
 1032:         return error;
 1033: }
 1034: 
 1035: /*
 1036:  * remove a route to prefix ("connected route" in cisco terminology).
 1037:  * re-installs the route by using another interface address, if there's one
 1038:  * with the same prefix (otherwise we lose the route mistakenly).
 1039:  */
 1040: static int
 1041: in_scrubprefix(struct in_ifaddr *target)
 1042: {
 1043:         struct in_ifaddr *ia;
 1044:         struct in_addr prefix, mask, p;
 1045:         int error;
 1046: 
 1047:         if ((target->ia_flags & IFA_ROUTE) == 0)
 1048:                 return 0;
 1049: 
 1050:         if (rtinitflags(target))
 1051:                 prefix = target->ia_dstaddr.sin_addr;
 1052:         else {
 1053:                 prefix = target->ia_addr.sin_addr;
 1054:                 mask = target->ia_sockmask.sin_addr;
 1055:                 prefix.s_addr &= mask.s_addr;
 1056:         }
 1057: 
 1058:         TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) {
 1059:                 if (rtinitflags(ia))
 1060:                         p = ia->ia_dstaddr.sin_addr;
 1061:                 else {
 1062:                         p = ia->ia_addr.sin_addr;
 1063:                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
 1064:                 }
 1065: 
 1066:                 if (prefix.s_addr != p.s_addr)
 1067:                         continue;
 1068: 
 1069:                 /*
 1070:                  * if we got a matching prefix route, move IFA_ROUTE to him
 1071:                  */
 1072:                 if ((ia->ia_flags & IFA_ROUTE) == 0) {
 1073:                         rtinit(&target->ia_ifa, RTM_DELETE,
 1074:                             rtinitflags(target));
 1075:                         target->ia_flags &= ~IFA_ROUTE;
 1076: 
 1077:                         error = rtinit(&ia->ia_ifa, RTM_ADD,
 1078:                             rtinitflags(ia) | RTF_UP);
 1079:                         if (error == 0)
 1080:                                 ia->ia_flags |= IFA_ROUTE;
 1081:                         return error;
 1082:                 }
 1083:         }
 1084: 
 1085:         /*
 1086:          * noone seem to have prefix route.  remove it.
 1087:          */
 1088:         rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
 1089:         target->ia_flags &= ~IFA_ROUTE;
 1090:         return 0;
 1091: }
 1092: 
 1093: #undef rtinitflags
 1094: 
 1095: /*
 1096:  * Return 1 if the address might be a local broadcast address.
 1097:  */
 1098: int
 1099: in_broadcast(struct in_addr in, struct ifnet *ifp)
 1100: {
 1101:         struct ifaddr *ifa;
 1102: 
 1103:         if (in.s_addr == INADDR_BROADCAST ||
 1104:             in_nullhost(in))
 1105:                 return 1;
 1106:         if ((ifp->if_flags & IFF_BROADCAST) == 0)
 1107:                 return 0;
 1108:         /*
 1109:          * Look through the list of addresses for a match
 1110:          * with a broadcast address.
 1111:          */
 1112: #define ia (ifatoia(ifa))
 1113:         IFADDR_FOREACH(ifa, ifp)
 1114:                 if (ifa->ifa_addr->sa_family == AF_INET &&
 1115:                     !in_hosteq(in, ia->ia_addr.sin_addr) &&
 1116:                     (in_hosteq(in, ia->ia_broadaddr.sin_addr) ||
 1117:                      in_hosteq(in, ia->ia_netbroadcast) ||
 1118:                      (hostzeroisbroadcast &&
 1119:                       /*
 1120:                        * Check for old-style (host 0) broadcast.
 1121:                        */
 1122:                       (in.s_addr == ia->ia_subnet ||
 1123:                        in.s_addr == ia->ia_net))))
 1124:                         return 1;
 1125:         return (0);
 1126: #undef ia
 1127: }
 1128: 
 1129: /*
 1130:  * Add an address to the list of IP multicast addresses for a given interface.
 1131:  */
 1132: struct in_multi *
 1133: in_addmulti(struct in_addr *ap, struct ifnet *ifp)
 1134: {
 1135:         struct sockaddr_in sin;
 1136:         struct in_multi *inm;
 1137:         struct ifreq ifr;
 1138:         int s = splsoftnet();
 1139: 
 1140:         /*
 1141:          * See if address already in list.
 1142:          */
 1143:         IN_LOOKUP_MULTI(*ap, ifp, inm);
 1144:         if (inm != NULL) {
 1145:                 /*
 1146:                  * Found it; just increment the reference count.
 1147:                  */
 1148:                 ++inm->inm_refcount;
 1149:         } else {
 1150:                 /*
 1151:                  * New address; allocate a new multicast record
 1152:                  * and link it into the interface's multicast list.
 1153:                  */
 1154:                 inm = pool_get(&inmulti_pool, PR_NOWAIT);
 1155:                 if (inm == NULL) {
 1156:                         splx(s);
 1157:                         return (NULL);
 1158:                 }
 1159:                 inm->inm_addr = *ap;
 1160:                 inm->inm_ifp = ifp;
 1161:                 inm->inm_refcount = 1;
 1162:                 LIST_INSERT_HEAD(
 1163:                     &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp),
 1164:                     inm, inm_list);
 1165:                 /*
 1166:                  * Ask the network driver to update its multicast reception
 1167:                  * filter appropriately for the new address.
 1168:                  */
 1169:                 sockaddr_in_init(&sin, ap, 0);
 1170:                 ifreq_setaddr(SIOCADDMULTI, &ifr, sintosa(&sin));
 1171:                 if ((ifp->if_ioctl == NULL) ||
 1172:                     (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(void *)&ifr) != 0) {
 1173:                         LIST_REMOVE(inm, inm_list);
 1174:                         pool_put(&inmulti_pool, inm);
 1175:                         splx(s);
 1176:                         return (NULL);
 1177:                 }
 1178:                 /*
 1179:                  * Let IGMP know that we have joined a new IP multicast group.
 1180:                  */
 1181:                 if (igmp_joingroup(inm) != 0) {
 1182:                         LIST_REMOVE(inm, inm_list);
 1183:                         pool_put(&inmulti_pool, inm);
 1184:                         splx(s);
 1185:                         return (NULL);
 1186:                 }
 1187:                 in_multientries++;
 1188:         }
 1189:         splx(s);
 1190:         return (inm);
 1191: }
 1192: 
 1193: /*
 1194:  * Delete a multicast address record.
 1195:  */
 1196: void
 1197: in_delmulti(struct in_multi *inm)
 1198: {
 1199:         struct sockaddr_in sin;
 1200:         struct ifreq ifr;
 1201:         int s = splsoftnet();
 1202: 
 1203:         if (--inm->inm_refcount == 0) {
 1204:                 /*
 1205:                  * No remaining claims to this record; let IGMP know that
 1206:                  * we are leaving the multicast group.
 1207:                  */
 1208:                 igmp_leavegroup(inm);
 1209:                 /*
 1210:                  * Unlink from list.
 1211:                  */
 1212:                 LIST_REMOVE(inm, inm_list);
 1213:                 in_multientries--;
 1214:                 /*
 1215:                  * Notify the network driver to update its multicast reception
 1216:                  * filter.
 1217:                  */
 1218:                 sockaddr_in_init(&sin, &inm->inm_addr, 0);
 1219:                 ifreq_setaddr(SIOCDELMULTI, &ifr, sintosa(&sin));
 1220:                 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI,
 1221:                                                              (void *)&ifr);
 1222:                 pool_put(&inmulti_pool, inm);
 1223:         }
 1224:         splx(s);
 1225: }