The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.c

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    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_mpath.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/sockio.h>
   41 #include <sys/malloc.h>
   42 #include <sys/priv.h>
   43 #include <sys/socket.h>
   44 #include <sys/jail.h>
   45 #include <sys/kernel.h>
   46 #include <sys/proc.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/syslog.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_var.h>
   52 #include <net/if_arp.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 *, u_int);
   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 #define V_subnetsarelocal               VNET(subnetsarelocal)
   81 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
   82         &VNET_NAME(subnetsarelocal), 0,
   83         "Treat all subnets as directly connected");
   84 static VNET_DEFINE(int, sameprefixcarponly);
   85 #define V_sameprefixcarponly            VNET(sameprefixcarponly)
   86 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
   87         &VNET_NAME(sameprefixcarponly), 0,
   88         "Refuse to create same prefixes on different interfaces");
   89 
   90 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
   91 #define V_ripcbinfo                     VNET(ripcbinfo)
   92 
   93 VNET_DECLARE(struct arpstat, arpstat);  /* ARP statistics, see if_arp.h */
   94 #define V_arpstat               VNET(arpstat)
   95 
   96 /*
   97  * Return 1 if an internet address is for a ``local'' host
   98  * (one to which we have a connection).  If subnetsarelocal
   99  * is true, this includes other subnets of the local net.
  100  * Otherwise, it includes only the directly-connected (sub)nets.
  101  */
  102 int
  103 in_localaddr(struct in_addr in)
  104 {
  105         register u_long i = ntohl(in.s_addr);
  106         register struct in_ifaddr *ia;
  107 
  108         IN_IFADDR_RLOCK();
  109         if (V_subnetsarelocal) {
  110                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  111                         if ((i & ia->ia_netmask) == ia->ia_net) {
  112                                 IN_IFADDR_RUNLOCK();
  113                                 return (1);
  114                         }
  115                 }
  116         } else {
  117                 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  118                         if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
  119                                 IN_IFADDR_RUNLOCK();
  120                                 return (1);
  121                         }
  122                 }
  123         }
  124         IN_IFADDR_RUNLOCK();
  125         return (0);
  126 }
  127 
  128 /*
  129  * Return 1 if an internet address is for the local host and configured
  130  * on one of its interfaces.
  131  */
  132 int
  133 in_localip(struct in_addr in)
  134 {
  135         struct in_ifaddr *ia;
  136 
  137         IN_IFADDR_RLOCK();
  138         LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
  139                 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
  140                         IN_IFADDR_RUNLOCK();
  141                         return (1);
  142                 }
  143         }
  144         IN_IFADDR_RUNLOCK();
  145         return (0);
  146 }
  147 
  148 /*
  149  * Determine whether an IP address is in a reserved set of addresses
  150  * that may not be forwarded, or whether datagrams to that destination
  151  * may be forwarded.
  152  */
  153 int
  154 in_canforward(struct in_addr in)
  155 {
  156         register u_long i = ntohl(in.s_addr);
  157         register u_long net;
  158 
  159         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
  160                 return (0);
  161         if (IN_CLASSA(i)) {
  162                 net = i & IN_CLASSA_NET;
  163                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
  164                         return (0);
  165         }
  166         return (1);
  167 }
  168 
  169 /*
  170  * Trim a mask in a sockaddr
  171  */
  172 static void
  173 in_socktrim(struct sockaddr_in *ap)
  174 {
  175     register char *cplim = (char *) &ap->sin_addr;
  176     register char *cp = (char *) (&ap->sin_addr + 1);
  177 
  178     ap->sin_len = 0;
  179     while (--cp >= cplim)
  180         if (*cp) {
  181             (ap)->sin_len = cp - (char *) (ap) + 1;
  182             break;
  183         }
  184 }
  185 
  186 static int
  187 in_mask2len(mask)
  188         struct in_addr *mask;
  189 {
  190         int x, y;
  191         u_char *p;
  192 
  193         p = (u_char *)mask;
  194         for (x = 0; x < sizeof(*mask); x++) {
  195                 if (p[x] != 0xff)
  196                         break;
  197         }
  198         y = 0;
  199         if (x < sizeof(*mask)) {
  200                 for (y = 0; y < 8; y++) {
  201                         if ((p[x] & (0x80 >> y)) == 0)
  202                                 break;
  203                 }
  204         }
  205         return (x * 8 + y);
  206 }
  207 
  208 static void
  209 in_len2mask(struct in_addr *mask, int len)
  210 {
  211         int i;
  212         u_char *p;
  213 
  214         p = (u_char *)mask;
  215         bzero(mask, sizeof(*mask));
  216         for (i = 0; i < len / 8; i++)
  217                 p[i] = 0xff;
  218         if (len % 8)
  219                 p[i] = (0xff00 >> (len % 8)) & 0xff;
  220 }
  221 
  222 /*
  223  * Generic internet control operations (ioctl's).
  224  *
  225  * ifp is NULL if not an interface-specific ioctl.
  226  */
  227 /* ARGSUSED */
  228 int
  229 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
  230     struct thread *td)
  231 {
  232         register struct ifreq *ifr = (struct ifreq *)data;
  233         register struct in_ifaddr *ia, *iap;
  234         register struct ifaddr *ifa;
  235         struct in_addr allhosts_addr;
  236         struct in_addr dst;
  237         struct in_ifinfo *ii;
  238         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
  239         struct sockaddr_in oldaddr;
  240         int error, hostIsNew, iaIsNew, maskIsNew;
  241         int iaIsFirst;
  242 
  243         ia = NULL;
  244         iaIsFirst = 0;
  245         iaIsNew = 0;
  246         allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
  247 
  248         /*
  249          * Filter out ioctls we implement directly; forward the rest on to
  250          * in_lifaddr_ioctl() and ifp->if_ioctl().
  251          */
  252         switch (cmd) {
  253         case SIOCAIFADDR:
  254         case SIOCDIFADDR:
  255         case SIOCGIFADDR:
  256         case SIOCGIFBRDADDR:
  257         case SIOCGIFDSTADDR:
  258         case SIOCGIFNETMASK:
  259         case SIOCSIFADDR:
  260         case SIOCSIFBRDADDR:
  261         case SIOCSIFDSTADDR:
  262         case SIOCSIFNETMASK:
  263                 break;
  264 
  265         case SIOCALIFADDR:
  266                 if (td != NULL) {
  267                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  268                         if (error)
  269                                 return (error);
  270                 }
  271                 if (ifp == NULL)
  272                         return (EINVAL);
  273                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
  274 
  275         case SIOCDLIFADDR:
  276                 if (td != NULL) {
  277                         error = priv_check(td, PRIV_NET_DELIFADDR);
  278                         if (error)
  279                                 return (error);
  280                 }
  281                 if (ifp == NULL)
  282                         return (EINVAL);
  283                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
  284 
  285         case SIOCGLIFADDR:
  286                 if (ifp == NULL)
  287                         return (EINVAL);
  288                 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
  289 
  290         default:
  291                 if (ifp == NULL || ifp->if_ioctl == NULL)
  292                         return (EOPNOTSUPP);
  293                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  294         }
  295 
  296         if (ifp == NULL)
  297                 return (EADDRNOTAVAIL);
  298 
  299         /*
  300          * Security checks before we get involved in any work.
  301          */
  302         switch (cmd) {
  303         case SIOCAIFADDR:
  304         case SIOCSIFADDR:
  305         case SIOCSIFBRDADDR:
  306         case SIOCSIFNETMASK:
  307         case SIOCSIFDSTADDR:
  308                 if (td != NULL) {
  309                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  310                         if (error)
  311                                 return (error);
  312                 }
  313                 break;
  314 
  315         case SIOCDIFADDR:
  316                 if (td != NULL) {
  317                         error = priv_check(td, PRIV_NET_DELIFADDR);
  318                         if (error)
  319                                 return (error);
  320                 }
  321                 break;
  322         }
  323 
  324         /*
  325          * Find address for this interface, if it exists.
  326          *
  327          * If an alias address was specified, find that one instead of the
  328          * first one on the interface, if possible.
  329          */
  330         dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
  331         IN_IFADDR_RLOCK();
  332         LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) {
  333                 if (iap->ia_ifp == ifp &&
  334                     iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
  335                         if (td == NULL || prison_check_ip4(td->td_ucred,
  336                             &dst) == 0)
  337                                 ia = iap;
  338                         break;
  339                 }
  340         }
  341         if (ia != NULL)
  342                 ifa_ref(&ia->ia_ifa);
  343         IN_IFADDR_RUNLOCK();
  344         if (ia == NULL) {
  345                 IF_ADDR_RLOCK(ifp);
  346                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  347                         iap = ifatoia(ifa);
  348                         if (iap->ia_addr.sin_family == AF_INET) {
  349                                 if (td != NULL &&
  350                                     prison_check_ip4(td->td_ucred,
  351                                     &iap->ia_addr.sin_addr) != 0)
  352                                         continue;
  353                                 ia = iap;
  354                                 break;
  355                         }
  356                 }
  357                 if (ia != NULL)
  358                         ifa_ref(&ia->ia_ifa);
  359                 IF_ADDR_RUNLOCK(ifp);
  360         }
  361         if (ia == NULL)
  362                 iaIsFirst = 1;
  363 
  364         error = 0;
  365         switch (cmd) {
  366         case SIOCAIFADDR:
  367         case SIOCDIFADDR:
  368                 if (ifra->ifra_addr.sin_family == AF_INET) {
  369                         struct in_ifaddr *oia;
  370 
  371                         IN_IFADDR_RLOCK();
  372                         for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
  373                                 if (ia->ia_ifp == ifp  &&
  374                                     ia->ia_addr.sin_addr.s_addr ==
  375                                     ifra->ifra_addr.sin_addr.s_addr)
  376                                         break;
  377                         }
  378                         if (ia != NULL && ia != oia)
  379                                 ifa_ref(&ia->ia_ifa);
  380                         if (oia != NULL && ia != oia)
  381                                 ifa_free(&oia->ia_ifa);
  382                         IN_IFADDR_RUNLOCK();
  383                         if ((ifp->if_flags & IFF_POINTOPOINT)
  384                             && (cmd == SIOCAIFADDR)
  385                             && (ifra->ifra_dstaddr.sin_addr.s_addr
  386                                 == INADDR_ANY)) {
  387                                 error = EDESTADDRREQ;
  388                                 goto out;
  389                         }
  390                 }
  391                 if (cmd == SIOCDIFADDR && ia == NULL) {
  392                         error = EADDRNOTAVAIL;
  393                         goto out;
  394                 }
  395                 /* FALLTHROUGH */
  396         case SIOCSIFADDR:
  397         case SIOCSIFNETMASK:
  398         case SIOCSIFDSTADDR:
  399                 if (ia == NULL) {
  400                         ia = (struct in_ifaddr *)
  401                                 malloc(sizeof *ia, M_IFADDR, M_NOWAIT |
  402                                     M_ZERO);
  403                         if (ia == NULL) {
  404                                 error = ENOBUFS;
  405                                 goto out;
  406                         }
  407 
  408                         ifa = &ia->ia_ifa;
  409                         ifa_init(ifa);
  410                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
  411                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
  412                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
  413 
  414                         ia->ia_sockmask.sin_len = 8;
  415                         ia->ia_sockmask.sin_family = AF_INET;
  416                         if (ifp->if_flags & IFF_BROADCAST) {
  417                                 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
  418                                 ia->ia_broadaddr.sin_family = AF_INET;
  419                         }
  420                         ia->ia_ifp = ifp;
  421 
  422                         ifa_ref(ifa);                   /* if_addrhead */
  423                         IF_ADDR_WLOCK(ifp);
  424                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
  425                         IF_ADDR_WUNLOCK(ifp);
  426                         ifa_ref(ifa);                   /* in_ifaddrhead */
  427                         IN_IFADDR_WLOCK();
  428                         TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
  429                         IN_IFADDR_WUNLOCK();
  430                         iaIsNew = 1;
  431                 }
  432                 break;
  433 
  434         case SIOCSIFBRDADDR:
  435         case SIOCGIFADDR:
  436         case SIOCGIFNETMASK:
  437         case SIOCGIFDSTADDR:
  438         case SIOCGIFBRDADDR:
  439                 if (ia == NULL) {
  440                         error = EADDRNOTAVAIL;
  441                         goto out;
  442                 }
  443                 break;
  444         }
  445 
  446         /*
  447          * Most paths in this switch return directly or via out.  Only paths
  448          * that remove the address break in order to hit common removal code.
  449          */
  450         switch (cmd) {
  451         case SIOCGIFADDR:
  452                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
  453                 goto out;
  454 
  455         case SIOCGIFBRDADDR:
  456                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  457                         error = EINVAL;
  458                         goto out;
  459                 }
  460                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
  461                 goto out;
  462 
  463         case SIOCGIFDSTADDR:
  464                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  465                         error = EINVAL;
  466                         goto out;
  467                 }
  468                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
  469                 goto out;
  470 
  471         case SIOCGIFNETMASK:
  472                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
  473                 goto out;
  474 
  475         case SIOCSIFDSTADDR:
  476                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  477                         error = EINVAL;
  478                         goto out;
  479                 }
  480                 oldaddr = ia->ia_dstaddr;
  481                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
  482                 if (ifp->if_ioctl != NULL) {
  483                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
  484                             (caddr_t)ia);
  485                         if (error) {
  486                                 ia->ia_dstaddr = oldaddr;
  487                                 goto out;
  488                         }
  489                 }
  490                 if (ia->ia_flags & IFA_ROUTE) {
  491                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
  492                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
  493                         ia->ia_ifa.ifa_dstaddr =
  494                                         (struct sockaddr *)&ia->ia_dstaddr;
  495                         rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
  496                 }
  497                 goto out;
  498 
  499         case SIOCSIFBRDADDR:
  500                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  501                         error = EINVAL;
  502                         goto out;
  503                 }
  504                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
  505                 goto out;
  506 
  507         case SIOCSIFADDR:
  508                 error = in_ifinit(ifp, ia,
  509                     (struct sockaddr_in *) &ifr->ifr_addr, 1);
  510                 if (error != 0 && iaIsNew)
  511                         break;
  512                 if (error == 0) {
  513                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
  514                         if (iaIsFirst &&
  515                             (ifp->if_flags & IFF_MULTICAST) != 0) {
  516                                 error = in_joingroup(ifp, &allhosts_addr,
  517                                     NULL, &ii->ii_allhosts);
  518                         }
  519                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  520                 }
  521                 error = 0;
  522                 goto out;
  523 
  524         case SIOCSIFNETMASK:
  525                 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
  526                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
  527                 goto out;
  528 
  529         case SIOCAIFADDR:
  530                 maskIsNew = 0;
  531                 hostIsNew = 1;
  532                 error = 0;
  533                 if (ia->ia_addr.sin_family == AF_INET) {
  534                         if (ifra->ifra_addr.sin_len == 0) {
  535                                 ifra->ifra_addr = ia->ia_addr;
  536                                 hostIsNew = 0;
  537                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
  538                                                ia->ia_addr.sin_addr.s_addr)
  539                                 hostIsNew = 0;
  540                 }
  541                 if (ifra->ifra_mask.sin_len) {
  542                         /* 
  543                          * QL: XXX
  544                          * Need to scrub the prefix here in case
  545                          * the issued command is SIOCAIFADDR with
  546                          * the same address, but with a different
  547                          * prefix length. And if the prefix length
  548                          * is the same as before, then the call is 
  549                          * un-necessarily executed here.
  550                          */
  551                         in_ifscrub(ifp, ia, LLE_STATIC);
  552                         ia->ia_sockmask = ifra->ifra_mask;
  553                         ia->ia_sockmask.sin_family = AF_INET;
  554                         ia->ia_subnetmask =
  555                              ntohl(ia->ia_sockmask.sin_addr.s_addr);
  556                         maskIsNew = 1;
  557                 }
  558                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  559                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
  560                         in_ifscrub(ifp, ia, LLE_STATIC);
  561                         ia->ia_dstaddr = ifra->ifra_dstaddr;
  562                         maskIsNew  = 1; /* We lie; but the effect's the same */
  563                 }
  564                 if (ifra->ifra_addr.sin_family == AF_INET &&
  565                     (hostIsNew || maskIsNew))
  566                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
  567                 if (error != 0 && iaIsNew)
  568                         goto out;
  569 
  570                 if ((ifp->if_flags & IFF_BROADCAST) &&
  571                     (ifra->ifra_broadaddr.sin_family == AF_INET))
  572                         ia->ia_broadaddr = ifra->ifra_broadaddr;
  573                 if (error == 0) {
  574                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
  575                         if (iaIsFirst &&
  576                             (ifp->if_flags & IFF_MULTICAST) != 0) {
  577                                 error = in_joingroup(ifp, &allhosts_addr,
  578                                     NULL, &ii->ii_allhosts);
  579                         }
  580                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  581                 }
  582                 goto out;
  583 
  584         case SIOCDIFADDR:
  585                 /*
  586                  * in_ifscrub kills the interface route.
  587                  */
  588                 in_ifscrub(ifp, ia, LLE_STATIC);
  589 
  590                 /*
  591                  * in_ifadown gets rid of all the rest of
  592                  * the routes.  This is not quite the right
  593                  * thing to do, but at least if we are running
  594                  * a routing process they will come back.
  595                  */
  596                 in_ifadown(&ia->ia_ifa, 1);
  597                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  598                 error = 0;
  599                 break;
  600 
  601         default:
  602                 panic("in_control: unsupported ioctl");
  603         }
  604 
  605         IF_ADDR_WLOCK(ifp);
  606         /* Re-check that ia is still part of the list. */
  607         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  608                 if (ifa == &ia->ia_ifa)
  609                         break;
  610         }
  611         if (ifa == NULL) {
  612                 /*
  613                  * If we lost the race with another thread, there is no need to
  614                  * try it again for the next loop as there is no other exit
  615                  * path between here and out.
  616                  */
  617                 IF_ADDR_WUNLOCK(ifp);
  618                 error = EADDRNOTAVAIL;
  619                 goto out;
  620         }
  621         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
  622         IF_ADDR_WUNLOCK(ifp);
  623         ifa_free(&ia->ia_ifa);                          /* if_addrhead */
  624 
  625         IN_IFADDR_WLOCK();
  626         TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
  627         if (ia->ia_addr.sin_family == AF_INET) {
  628                 struct in_ifaddr *if_ia;
  629 
  630                 LIST_REMOVE(ia, ia_hash);
  631                 IN_IFADDR_WUNLOCK();
  632                 /*
  633                  * If this is the last IPv4 address configured on this
  634                  * interface, leave the all-hosts group.
  635                  * No state-change report need be transmitted.
  636                  */
  637                 if_ia = NULL;
  638                 IFP_TO_IA(ifp, if_ia);
  639                 if (if_ia == NULL) {
  640                         ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
  641                         IN_MULTI_LOCK();
  642                         if (ii->ii_allhosts) {
  643                                 (void)in_leavegroup_locked(ii->ii_allhosts,
  644                                     NULL);
  645                                 ii->ii_allhosts = NULL;
  646                         }
  647                         IN_MULTI_UNLOCK();
  648                 } else
  649                         ifa_free(&if_ia->ia_ifa);
  650         } else
  651                 IN_IFADDR_WUNLOCK();
  652         ifa_free(&ia->ia_ifa);                          /* in_ifaddrhead */
  653 out:
  654         if (ia != NULL)
  655                 ifa_free(&ia->ia_ifa);
  656         return (error);
  657 }
  658 
  659 /*
  660  * SIOC[GAD]LIFADDR.
  661  *      SIOCGLIFADDR: get first address. (?!?)
  662  *      SIOCGLIFADDR with IFLR_PREFIX:
  663  *              get first address that matches the specified prefix.
  664  *      SIOCALIFADDR: add the specified address.
  665  *      SIOCALIFADDR with IFLR_PREFIX:
  666  *              EINVAL since we can't deduce hostid part of the address.
  667  *      SIOCDLIFADDR: delete the specified address.
  668  *      SIOCDLIFADDR with IFLR_PREFIX:
  669  *              delete the first address that matches the specified prefix.
  670  * return values:
  671  *      EINVAL on invalid parameters
  672  *      EADDRNOTAVAIL on prefix match failed/specified address not found
  673  *      other values may be returned from in_ioctl()
  674  */
  675 static int
  676 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
  677     struct ifnet *ifp, struct thread *td)
  678 {
  679         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
  680         struct ifaddr *ifa;
  681 
  682         /* sanity checks */
  683         if (data == NULL || ifp == NULL) {
  684                 panic("invalid argument to in_lifaddr_ioctl");
  685                 /*NOTRECHED*/
  686         }
  687 
  688         switch (cmd) {
  689         case SIOCGLIFADDR:
  690                 /* address must be specified on GET with IFLR_PREFIX */
  691                 if ((iflr->flags & IFLR_PREFIX) == 0)
  692                         break;
  693                 /*FALLTHROUGH*/
  694         case SIOCALIFADDR:
  695         case SIOCDLIFADDR:
  696                 /* address must be specified on ADD and DELETE */
  697                 if (iflr->addr.ss_family != AF_INET)
  698                         return (EINVAL);
  699                 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
  700                         return (EINVAL);
  701                 /* XXX need improvement */
  702                 if (iflr->dstaddr.ss_family
  703                  && iflr->dstaddr.ss_family != AF_INET)
  704                         return (EINVAL);
  705                 if (iflr->dstaddr.ss_family
  706                  && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
  707                         return (EINVAL);
  708                 break;
  709         default: /*shouldn't happen*/
  710                 return (EOPNOTSUPP);
  711         }
  712         if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
  713                 return (EINVAL);
  714 
  715         switch (cmd) {
  716         case SIOCALIFADDR:
  717             {
  718                 struct in_aliasreq ifra;
  719 
  720                 if (iflr->flags & IFLR_PREFIX)
  721                         return (EINVAL);
  722 
  723                 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */
  724                 bzero(&ifra, sizeof(ifra));
  725                 bcopy(iflr->iflr_name, ifra.ifra_name,
  726                         sizeof(ifra.ifra_name));
  727 
  728                 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
  729 
  730                 if (iflr->dstaddr.ss_family) {  /*XXX*/
  731                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
  732                                 iflr->dstaddr.ss_len);
  733                 }
  734 
  735                 ifra.ifra_mask.sin_family = AF_INET;
  736                 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
  737                 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
  738 
  739                 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td));
  740             }
  741         case SIOCGLIFADDR:
  742         case SIOCDLIFADDR:
  743             {
  744                 struct in_ifaddr *ia;
  745                 struct in_addr mask, candidate, match;
  746                 struct sockaddr_in *sin;
  747 
  748                 bzero(&mask, sizeof(mask));
  749                 bzero(&match, sizeof(match));
  750                 if (iflr->flags & IFLR_PREFIX) {
  751                         /* lookup a prefix rather than address. */
  752                         in_len2mask(&mask, iflr->prefixlen);
  753 
  754                         sin = (struct sockaddr_in *)&iflr->addr;
  755                         match.s_addr = sin->sin_addr.s_addr;
  756                         match.s_addr &= mask.s_addr;
  757 
  758                         /* if you set extra bits, that's wrong */
  759                         if (match.s_addr != sin->sin_addr.s_addr)
  760                                 return (EINVAL);
  761 
  762                 } else {
  763                         /* on getting an address, take the 1st match */
  764                         /* on deleting an address, do exact match */
  765                         if (cmd != SIOCGLIFADDR) {
  766                                 in_len2mask(&mask, 32);
  767                                 sin = (struct sockaddr_in *)&iflr->addr;
  768                                 match.s_addr = sin->sin_addr.s_addr;
  769                         }
  770                 }
  771 
  772                 IF_ADDR_RLOCK(ifp);
  773                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  774                         if (ifa->ifa_addr->sa_family != AF_INET)
  775                                 continue;
  776                         if (match.s_addr == 0)
  777                                 break;
  778                         candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
  779                         candidate.s_addr &= mask.s_addr;
  780                         if (candidate.s_addr == match.s_addr)
  781                                 break;
  782                 }
  783                 if (ifa != NULL)
  784                         ifa_ref(ifa);
  785                 IF_ADDR_RUNLOCK(ifp);
  786                 if (ifa == NULL)
  787                         return (EADDRNOTAVAIL);
  788                 ia = (struct in_ifaddr *)ifa;
  789 
  790                 if (cmd == SIOCGLIFADDR) {
  791                         /* fill in the if_laddrreq structure */
  792                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
  793 
  794                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
  795                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
  796                                         ia->ia_dstaddr.sin_len);
  797                         } else
  798                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
  799 
  800                         iflr->prefixlen =
  801                                 in_mask2len(&ia->ia_sockmask.sin_addr);
  802 
  803                         iflr->flags = 0;        /*XXX*/
  804                         ifa_free(ifa);
  805 
  806                         return (0);
  807                 } else {
  808                         struct in_aliasreq ifra;
  809 
  810                         /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */
  811                         bzero(&ifra, sizeof(ifra));
  812                         bcopy(iflr->iflr_name, ifra.ifra_name,
  813                                 sizeof(ifra.ifra_name));
  814 
  815                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
  816                                 ia->ia_addr.sin_len);
  817                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
  818                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
  819                                         ia->ia_dstaddr.sin_len);
  820                         }
  821                         bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
  822                                 ia->ia_sockmask.sin_len);
  823                         ifa_free(ifa);
  824 
  825                         return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
  826                             ifp, td));
  827                 }
  828             }
  829         }
  830 
  831         return (EOPNOTSUPP);    /*just for safety*/
  832 }
  833 
  834 /*
  835  * Delete any existing route for an interface.
  836  */
  837 void
  838 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags)
  839 {
  840 
  841         in_scrubprefix(ia, flags);
  842 }
  843 
  844 /*
  845  * Initialize an interface's internet address
  846  * and routing table entry.
  847  */
  848 static int
  849 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
  850     int scrub)
  851 {
  852         register u_long i = ntohl(sin->sin_addr.s_addr);
  853         struct sockaddr_in oldaddr;
  854         int s = splimp(), flags = RTF_UP, error = 0;
  855 
  856         oldaddr = ia->ia_addr;
  857         if (oldaddr.sin_family == AF_INET)
  858                 LIST_REMOVE(ia, ia_hash);
  859         ia->ia_addr = *sin;
  860         if (ia->ia_addr.sin_family == AF_INET) {
  861                 IN_IFADDR_WLOCK();
  862                 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
  863                     ia, ia_hash);
  864                 IN_IFADDR_WUNLOCK();
  865         }
  866         /*
  867          * Give the interface a chance to initialize
  868          * if this is its first address,
  869          * and to validate the address if necessary.
  870          */
  871         if (ifp->if_ioctl != NULL) {
  872                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
  873                 if (error) {
  874                         splx(s);
  875                         /* LIST_REMOVE(ia, ia_hash) is done in in_control */
  876                         ia->ia_addr = oldaddr;
  877                         IN_IFADDR_WLOCK();
  878                         if (ia->ia_addr.sin_family == AF_INET)
  879                                 LIST_INSERT_HEAD(INADDR_HASH(
  880                                     ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
  881                         else 
  882                                 /* 
  883                                  * If oldaddr family is not AF_INET (e.g. 
  884                                  * interface has been just created) in_control 
  885                                  * does not call LIST_REMOVE, and we end up 
  886                                  * with bogus ia entries in hash
  887                                  */
  888                                 LIST_REMOVE(ia, ia_hash);
  889                         IN_IFADDR_WUNLOCK();
  890                         return (error);
  891                 }
  892         }
  893         splx(s);
  894         if (scrub) {
  895                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
  896                 in_ifscrub(ifp, ia, LLE_STATIC);
  897                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  898         }
  899         if (IN_CLASSA(i))
  900                 ia->ia_netmask = IN_CLASSA_NET;
  901         else if (IN_CLASSB(i))
  902                 ia->ia_netmask = IN_CLASSB_NET;
  903         else
  904                 ia->ia_netmask = IN_CLASSC_NET;
  905         /*
  906          * The subnet mask usually includes at least the standard network part,
  907          * but may may be smaller in the case of supernetting.
  908          * If it is set, we believe it.
  909          */
  910         if (ia->ia_subnetmask == 0) {
  911                 ia->ia_subnetmask = ia->ia_netmask;
  912                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
  913         } else
  914                 ia->ia_netmask &= ia->ia_subnetmask;
  915         ia->ia_net = i & ia->ia_netmask;
  916         ia->ia_subnet = i & ia->ia_subnetmask;
  917         in_socktrim(&ia->ia_sockmask);
  918         /*
  919          * XXX: carp(4) does not have interface route
  920          */
  921         if (ifp->if_type == IFT_CARP)
  922                 return (0);
  923         /*
  924          * Add route for the network.
  925          */
  926         ia->ia_ifa.ifa_metric = ifp->if_metric;
  927         if (ifp->if_flags & IFF_BROADCAST) {
  928                 ia->ia_broadaddr.sin_addr.s_addr =
  929                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
  930                 ia->ia_netbroadcast.s_addr =
  931                         htonl(ia->ia_net | ~ ia->ia_netmask);
  932         } else if (ifp->if_flags & IFF_LOOPBACK) {
  933                 ia->ia_dstaddr = ia->ia_addr;
  934                 flags |= RTF_HOST;
  935         } else if (ifp->if_flags & IFF_POINTOPOINT) {
  936                 if (ia->ia_dstaddr.sin_family != AF_INET)
  937                         return (0);
  938                 flags |= RTF_HOST;
  939         }
  940         if ((error = in_addprefix(ia, flags)) != 0)
  941                 return (error);
  942 
  943         if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
  944                 return (0);
  945 
  946         if (ifp->if_flags & IFF_POINTOPOINT) {
  947                 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
  948                         return (0);
  949         }
  950 
  951 
  952         /*
  953          * add a loopback route to self
  954          */
  955         if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) {
  956                 struct route ia_ro;
  957 
  958                 bzero(&ia_ro, sizeof(ia_ro));
  959                 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr;
  960                 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB);
  961                 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
  962                     (ia_ro.ro_rt->rt_ifp == V_loif)) {
  963                         RT_LOCK(ia_ro.ro_rt);
  964                         RT_ADDREF(ia_ro.ro_rt);
  965                         RTFREE_LOCKED(ia_ro.ro_rt);
  966                 } else
  967                         error = ifa_add_loopback_route((struct ifaddr *)ia, 
  968                                        (struct sockaddr *)&ia->ia_addr);
  969                 if (error == 0)
  970                         ia->ia_flags |= IFA_RTSELF;
  971                 if (ia_ro.ro_rt != NULL)
  972                         RTFREE(ia_ro.ro_rt);
  973         }
  974 
  975         return (error);
  976 }
  977 
  978 #define rtinitflags(x) \
  979         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
  980             ? RTF_HOST : 0)
  981 
  982 /*
  983  * Generate a routing message when inserting or deleting 
  984  * an interface address alias.
  985  */
  986 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 
  987     struct in_ifaddr *target)
  988 {
  989         struct route pfx_ro;
  990         struct sockaddr_in *pfx_addr;
  991         struct rtentry msg_rt;
  992 
  993         /* QL: XXX
  994          * This is a bit questionable because there is no
  995          * additional route entry added/deleted for an address
  996          * alias. Therefore this route report is inaccurate.
  997          */
  998         bzero(&pfx_ro, sizeof(pfx_ro));
  999         pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst);
 1000         pfx_addr->sin_len = sizeof(*pfx_addr);
 1001         pfx_addr->sin_family = AF_INET;
 1002         pfx_addr->sin_addr = *prefix;
 1003         rtalloc_ign_fib(&pfx_ro, 0, 0);
 1004         if (pfx_ro.ro_rt != NULL) {
 1005                 msg_rt = *pfx_ro.ro_rt;
 1006 
 1007                 /* QL: XXX
 1008                  * Point the gateway to the new interface
 1009                  * address as if a new prefix route entry has 
 1010                  * been added through the new address alias. 
 1011                  * All other parts of the rtentry is accurate, 
 1012                  * e.g., rt_key, rt_mask, rt_ifp etc.
 1013                  */
 1014                 msg_rt.rt_gateway = 
 1015                         (struct sockaddr *)&target->ia_addr;
 1016                 rt_newaddrmsg(cmd, 
 1017                               (struct ifaddr *)target,
 1018                               0, &msg_rt);
 1019                 RTFREE(pfx_ro.ro_rt);
 1020         }
 1021         return;
 1022 }
 1023 
 1024 /*
 1025  * Check if we have a route for the given prefix already or add one accordingly.
 1026  */
 1027 static int
 1028 in_addprefix(struct in_ifaddr *target, int flags)
 1029 {
 1030         struct in_ifaddr *ia;
 1031         struct in_addr prefix, mask, p, m;
 1032         int error;
 1033 
 1034         if ((flags & RTF_HOST) != 0) {
 1035                 prefix = target->ia_dstaddr.sin_addr;
 1036                 mask.s_addr = 0;
 1037         } else {
 1038                 prefix = target->ia_addr.sin_addr;
 1039                 mask = target->ia_sockmask.sin_addr;
 1040                 prefix.s_addr &= mask.s_addr;
 1041         }
 1042 
 1043         IN_IFADDR_RLOCK();
 1044         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 1045                 if (rtinitflags(ia)) {
 1046                         p = ia->ia_dstaddr.sin_addr;
 1047 
 1048                         if (prefix.s_addr != p.s_addr)
 1049                                 continue;
 1050                 } else {
 1051                         p = ia->ia_addr.sin_addr;
 1052                         m = ia->ia_sockmask.sin_addr;
 1053                         p.s_addr &= m.s_addr;
 1054 
 1055                         if (prefix.s_addr != p.s_addr ||
 1056                             mask.s_addr != m.s_addr)
 1057                                 continue;
 1058                 }
 1059 
 1060                 /*
 1061                  * If we got a matching prefix route inserted by other
 1062                  * interface address, we are done here.
 1063                  */
 1064                 if (ia->ia_flags & IFA_ROUTE) {
 1065 #ifdef RADIX_MPATH
 1066                         if (ia->ia_addr.sin_addr.s_addr == 
 1067                             target->ia_addr.sin_addr.s_addr) {
 1068                                 IN_IFADDR_RUNLOCK();
 1069                                 return (EEXIST);
 1070                         } else
 1071                                 break;
 1072 #endif
 1073                         if (V_sameprefixcarponly &&
 1074                             target->ia_ifp->if_type != IFT_CARP &&
 1075                             ia->ia_ifp->if_type != IFT_CARP) {
 1076                                 IN_IFADDR_RUNLOCK();
 1077                                 return (EEXIST);
 1078                         } else {
 1079                                 in_addralias_rtmsg(RTM_ADD, &prefix, target);
 1080                                 IN_IFADDR_RUNLOCK();
 1081                                 return (0);
 1082                         }
 1083                 }
 1084         }
 1085         IN_IFADDR_RUNLOCK();
 1086 
 1087         /*
 1088          * No-one seem to have this prefix route, so we try to insert it.
 1089          */
 1090         error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
 1091         if (!error)
 1092                 target->ia_flags |= IFA_ROUTE;
 1093         return (error);
 1094 }
 1095 
 1096 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
 1097 
 1098 /*
 1099  * If there is no other address in the system that can serve a route to the
 1100  * same prefix, remove the route.  Hand over the route to the new address
 1101  * otherwise.
 1102  */
 1103 static int
 1104 in_scrubprefix(struct in_ifaddr *target, u_int flags)
 1105 {
 1106         struct in_ifaddr *ia;
 1107         struct in_addr prefix, mask, p;
 1108         int error = 0;
 1109         struct sockaddr_in prefix0, mask0;
 1110 
 1111         /*
 1112          * Remove the loopback route to the interface address.
 1113          * The "useloopback" setting is not consulted because if the
 1114          * user configures an interface address, turns off this
 1115          * setting, and then tries to delete that interface address,
 1116          * checking the current setting of "useloopback" would leave
 1117          * that interface address loopback route untouched, which
 1118          * would be wrong. Therefore the interface address loopback route
 1119          * deletion is unconditional.
 1120          */
 1121         if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
 1122             !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
 1123             (target->ia_flags & IFA_RTSELF)) {
 1124                 struct route ia_ro;
 1125                 int freeit = 0;
 1126 
 1127                 bzero(&ia_ro, sizeof(ia_ro));
 1128                 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr;
 1129                 rtalloc_ign_fib(&ia_ro, 0, 0);
 1130                 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
 1131                     (ia_ro.ro_rt->rt_ifp == V_loif)) {
 1132                         RT_LOCK(ia_ro.ro_rt);
 1133                         if (ia_ro.ro_rt->rt_refcnt <= 1)
 1134                                 freeit = 1;
 1135                         else if (flags & LLE_STATIC) {
 1136                                 RT_REMREF(ia_ro.ro_rt);
 1137                                 target->ia_flags &= ~IFA_RTSELF;
 1138                         }
 1139                         RTFREE_LOCKED(ia_ro.ro_rt);
 1140                 }
 1141                 if (freeit && (flags & LLE_STATIC)) {
 1142                         error = ifa_del_loopback_route((struct ifaddr *)target,
 1143                                        (struct sockaddr *)&target->ia_addr);
 1144                         if (error == 0)
 1145                                 target->ia_flags &= ~IFA_RTSELF;
 1146                 }
 1147                 if ((flags & LLE_STATIC) &&
 1148                         !(target->ia_ifp->if_flags & IFF_NOARP))
 1149                         /* remove arp cache */
 1150                         arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
 1151         }
 1152 
 1153         if (rtinitflags(target))
 1154                 prefix = target->ia_dstaddr.sin_addr;
 1155         else {
 1156                 prefix = target->ia_addr.sin_addr;
 1157                 mask = target->ia_sockmask.sin_addr;
 1158                 prefix.s_addr &= mask.s_addr;
 1159         }
 1160 
 1161         if ((target->ia_flags & IFA_ROUTE) == 0) {
 1162                 in_addralias_rtmsg(RTM_DELETE, &prefix, target);
 1163                 return (0);
 1164         }
 1165 
 1166         IN_IFADDR_RLOCK();
 1167         TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
 1168                 if (rtinitflags(ia))
 1169                         p = ia->ia_dstaddr.sin_addr;
 1170                 else {
 1171                         p = ia->ia_addr.sin_addr;
 1172                         p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
 1173                 }
 1174 
 1175                 if ((prefix.s_addr != p.s_addr) ||
 1176                     !(ia->ia_ifp->if_flags & IFF_UP))
 1177                         continue;
 1178 
 1179                 /*
 1180                  * If we got a matching prefix address, move IFA_ROUTE and
 1181                  * the route itself to it.  Make sure that routing daemons
 1182                  * get a heads-up.
 1183                  *
 1184                  * XXX: a special case for carp(4) interface - this should
 1185                  *      be more generally specified as an interface that
 1186                  *      doesn't support such action.
 1187                  */
 1188                 if ((ia->ia_flags & IFA_ROUTE) == 0
 1189                     && (ia->ia_ifp->if_type != IFT_CARP)) {
 1190                         ifa_ref(&ia->ia_ifa);
 1191                         IN_IFADDR_RUNLOCK();
 1192                         error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
 1193                             rtinitflags(target));
 1194                         if (error == 0)
 1195                                 target->ia_flags &= ~IFA_ROUTE;
 1196                         else
 1197                                 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
 1198                                         error);
 1199                         error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
 1200                             rtinitflags(ia) | RTF_UP);
 1201                         if (error == 0)
 1202                                 ia->ia_flags |= IFA_ROUTE;
 1203                         else
 1204                                 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
 1205                                         error);
 1206                         ifa_free(&ia->ia_ifa);
 1207                         return (error);
 1208                 }
 1209         }
 1210         IN_IFADDR_RUNLOCK();
 1211 
 1212         /*
 1213          * remove all L2 entries on the given prefix
 1214          */
 1215         bzero(&prefix0, sizeof(prefix0));
 1216         prefix0.sin_len = sizeof(prefix0);
 1217         prefix0.sin_family = AF_INET;
 1218         prefix0.sin_addr.s_addr = target->ia_subnet;
 1219         bzero(&mask0, sizeof(mask0));
 1220         mask0.sin_len = sizeof(mask0);
 1221         mask0.sin_family = AF_INET;
 1222         mask0.sin_addr.s_addr = target->ia_subnetmask;
 1223         lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 
 1224                             (struct sockaddr *)&mask0, flags);
 1225 
 1226         /*
 1227          * As no-one seem to have this prefix, we can remove the route.
 1228          */
 1229         error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
 1230         if (error == 0)
 1231                 target->ia_flags &= ~IFA_ROUTE;
 1232         else
 1233                 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
 1234         return (error);
 1235 }
 1236 
 1237 #undef rtinitflags
 1238 
 1239 /*
 1240  * Return 1 if the address might be a local broadcast address.
 1241  */
 1242 int
 1243 in_broadcast(struct in_addr in, struct ifnet *ifp)
 1244 {
 1245         register struct ifaddr *ifa;
 1246         u_long t;
 1247 
 1248         if (in.s_addr == INADDR_BROADCAST ||
 1249             in.s_addr == INADDR_ANY)
 1250                 return (1);
 1251         if ((ifp->if_flags & IFF_BROADCAST) == 0)
 1252                 return (0);
 1253         t = ntohl(in.s_addr);
 1254         /*
 1255          * Look through the list of addresses for a match
 1256          * with a broadcast address.
 1257          */
 1258 #define ia ((struct in_ifaddr *)ifa)
 1259         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 1260                 if (ifa->ifa_addr->sa_family == AF_INET &&
 1261                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
 1262                      in.s_addr == ia->ia_netbroadcast.s_addr ||
 1263                      /*
 1264                       * Check for old-style (host 0) broadcast.
 1265                       */
 1266                      t == ia->ia_subnet || t == ia->ia_net) &&
 1267                      /*
 1268                       * Check for an all one subnetmask. These
 1269                       * only exist when an interface gets a secondary
 1270                       * address.
 1271                       */
 1272                      ia->ia_subnetmask != (u_long)0xffffffff)
 1273                             return (1);
 1274         return (0);
 1275 #undef ia
 1276 }
 1277 
 1278 /*
 1279  * On interface removal, clean up IPv4 data structures hung off of the ifnet.
 1280  */
 1281 void
 1282 in_ifdetach(struct ifnet *ifp)
 1283 {
 1284 
 1285         in_pcbpurgeif0(&V_ripcbinfo, ifp);
 1286         in_pcbpurgeif0(&V_udbinfo, ifp);
 1287         in_purgemaddrs(ifp);
 1288 }
 1289 
 1290 /*
 1291  * Delete all IPv4 multicast address records, and associated link-layer
 1292  * multicast address records, associated with ifp.
 1293  * XXX It looks like domifdetach runs AFTER the link layer cleanup.
 1294  * XXX This should not race with ifma_protospec being set during
 1295  * a new allocation, if it does, we have bigger problems.
 1296  */
 1297 static void
 1298 in_purgemaddrs(struct ifnet *ifp)
 1299 {
 1300         LIST_HEAD(,in_multi) purgeinms;
 1301         struct in_multi         *inm, *tinm;
 1302         struct ifmultiaddr      *ifma;
 1303 
 1304         LIST_INIT(&purgeinms);
 1305         IN_MULTI_LOCK();
 1306 
 1307         /*
 1308          * Extract list of in_multi associated with the detaching ifp
 1309          * which the PF_INET layer is about to release.
 1310          * We need to do this as IF_ADDR_LOCK() may be re-acquired
 1311          * by code further down.
 1312          */
 1313         IF_ADDR_RLOCK(ifp);
 1314         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 1315                 if (ifma->ifma_addr->sa_family != AF_INET ||
 1316                     ifma->ifma_protospec == NULL)
 1317                         continue;
 1318 #if 0
 1319                 KASSERT(ifma->ifma_protospec != NULL,
 1320                     ("%s: ifma_protospec is NULL", __func__));
 1321 #endif
 1322                 inm = (struct in_multi *)ifma->ifma_protospec;
 1323                 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
 1324         }
 1325         IF_ADDR_RUNLOCK(ifp);
 1326 
 1327         LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
 1328                 LIST_REMOVE(inm, inm_link);
 1329                 inm_release_locked(inm);
 1330         }
 1331         igmp_ifdetach(ifp);
 1332 
 1333         IN_MULTI_UNLOCK();
 1334 }
 1335 
 1336 #include <net/if_dl.h>
 1337 #include <netinet/if_ether.h>
 1338 
 1339 struct in_llentry {
 1340         struct llentry          base;
 1341         struct sockaddr_in      l3_addr4;
 1342 };
 1343 
 1344 static struct llentry *
 1345 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
 1346 {
 1347         struct in_llentry *lle;
 1348 
 1349         lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO);
 1350         if (lle == NULL)                /* NB: caller generates msg */
 1351                 return NULL;
 1352 
 1353         /*
 1354          * For IPv4 this will trigger "arpresolve" to generate
 1355          * an ARP request.
 1356          */
 1357         lle->base.la_expire = time_second; /* mark expired */
 1358         lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
 1359         lle->base.lle_refcnt = 1;
 1360         LLE_LOCK_INIT(&lle->base);
 1361         callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock,
 1362             CALLOUT_RETURNUNLOCKED);
 1363 
 1364         return (&lle->base);
 1365 }
 1366 
 1367 /*
 1368  * Deletes an address from the address table.
 1369  * This function is called by the timer functions
 1370  * such as arptimer() and nd6_llinfo_timer(), and
 1371  * the caller does the locking.
 1372  */
 1373 static void
 1374 in_lltable_free(struct lltable *llt, struct llentry *lle)
 1375 {
 1376         LLE_WUNLOCK(lle);
 1377         LLE_LOCK_DESTROY(lle);
 1378         free(lle, M_LLTABLE);
 1379 }
 1380 
 1381 
 1382 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)       (                       \
 1383             (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
 1384 
 1385 static void
 1386 in_lltable_prefix_free(struct lltable *llt, 
 1387                        const struct sockaddr *prefix,
 1388                        const struct sockaddr *mask,
 1389                        u_int flags)
 1390 {
 1391         const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
 1392         const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
 1393         struct llentry *lle, *next;
 1394         register int i;
 1395         size_t pkts_dropped;
 1396 
 1397         IF_AFDATA_WLOCK(llt->llt_ifp);
 1398         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 1399                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
 1400 
 1401                         /* 
 1402                          * (flags & LLE_STATIC) means deleting all entries
 1403                          * including static ARP entries
 1404                          */
 1405                         if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 
 1406                                                      pfx, msk) &&
 1407                             ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
 1408                                 LLE_WLOCK(lle);
 1409                                 if (callout_stop(&lle->la_timer))
 1410                                         LLE_REMREF(lle);
 1411                                 pkts_dropped = llentry_free(lle);
 1412                                 ARPSTAT_ADD(dropped, pkts_dropped);
 1413                         }
 1414                 }
 1415         }
 1416         IF_AFDATA_WUNLOCK(llt->llt_ifp);
 1417 }
 1418 
 1419 
 1420 static int
 1421 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
 1422 {
 1423         struct rtentry *rt;
 1424 
 1425         KASSERT(l3addr->sa_family == AF_INET,
 1426             ("sin_family %d", l3addr->sa_family));
 1427 
 1428         /* XXX rtalloc1 should take a const param */
 1429         rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
 1430 
 1431         if (rt == NULL)
 1432                 return (EINVAL);
 1433 
 1434         /*
 1435          * If the gateway for an existing host route matches the target L3
 1436          * address, which is a special route inserted by some implementation
 1437          * such as MANET, and the interface is of the correct type, then
 1438          * allow for ARP to proceed.
 1439          */
 1440         if (rt->rt_flags & RTF_GATEWAY) {
 1441                 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
 1442                         rt->rt_ifp->if_type != IFT_ETHER ||
 1443                           (rt->rt_ifp->if_flags & 
 1444                            (IFF_NOARP | IFF_STATICARP)) != 0 ||
 1445                           memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
 1446                                  sizeof(in_addr_t)) != 0) {
 1447                         RTFREE_LOCKED(rt);
 1448                         return (EINVAL);
 1449                 }
 1450         }
 1451 
 1452         /*
 1453          * Make sure that at least the destination address is covered 
 1454          * by the route. This is for handling the case where 2 or more 
 1455          * interfaces have the same prefix. An incoming packet arrives
 1456          * on one interface and the corresponding outgoing packet leaves
 1457          * another interface.
 1458          */
 1459         if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
 1460                 const char *sa, *mask, *addr, *lim;
 1461                 int len;
 1462 
 1463                 mask = (const char *)rt_mask(rt);
 1464                 /*
 1465                  * Just being extra cautious to avoid some custom
 1466                  * code getting into trouble.
 1467                  */
 1468                 if (mask == NULL) {
 1469                         RTFREE_LOCKED(rt);
 1470                         return (EINVAL);
 1471                 }
 1472 
 1473                 sa = (const char *)rt_key(rt);
 1474                 addr = (const char *)l3addr;
 1475                 len = ((const struct sockaddr_in *)l3addr)->sin_len;
 1476                 lim = addr + len;
 1477 
 1478                 for ( ; addr < lim; sa++, mask++, addr++) {
 1479                         if ((*sa ^ *addr) & *mask) {
 1480 #ifdef DIAGNOSTIC
 1481                                 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
 1482                                     inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
 1483 #endif
 1484                                 RTFREE_LOCKED(rt);
 1485                                 return (EINVAL);
 1486                         }
 1487                 }
 1488         }
 1489 
 1490         RTFREE_LOCKED(rt);
 1491         return (0);
 1492 }
 1493 
 1494 /*
 1495  * Return NULL if not found or marked for deletion.
 1496  * If found return lle read locked.
 1497  */
 1498 static struct llentry *
 1499 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
 1500 {
 1501         const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
 1502         struct ifnet *ifp = llt->llt_ifp;
 1503         struct llentry *lle;
 1504         struct llentries *lleh;
 1505         u_int hashkey;
 1506 
 1507         IF_AFDATA_LOCK_ASSERT(ifp);
 1508         KASSERT(l3addr->sa_family == AF_INET,
 1509             ("sin_family %d", l3addr->sa_family));
 1510 
 1511         hashkey = sin->sin_addr.s_addr;
 1512         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
 1513         LIST_FOREACH(lle, lleh, lle_next) {
 1514                 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle);
 1515                 if (lle->la_flags & LLE_DELETED)
 1516                         continue;
 1517                 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
 1518                         break;
 1519         }
 1520         if (lle == NULL) {
 1521 #ifdef DIAGNOSTIC
 1522                 if (flags & LLE_DELETE)
 1523                         log(LOG_INFO, "interface address is missing from cache = %p  in delete\n", lle);        
 1524 #endif
 1525                 if (!(flags & LLE_CREATE))
 1526                         return (NULL);
 1527                 /*
 1528                  * A route that covers the given address must have
 1529                  * been installed 1st because we are doing a resolution,
 1530                  * verify this.
 1531                  */
 1532                 if (!(flags & LLE_IFADDR) &&
 1533                     in_lltable_rtcheck(ifp, flags, l3addr) != 0)
 1534                         goto done;
 1535 
 1536                 lle = in_lltable_new(l3addr, flags);
 1537                 if (lle == NULL) {
 1538                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 1539                         goto done;
 1540                 }
 1541                 lle->la_flags = flags & ~LLE_CREATE;
 1542                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
 1543                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
 1544                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
 1545                 }
 1546 
 1547                 lle->lle_tbl  = llt;
 1548                 lle->lle_head = lleh;
 1549                 lle->la_flags |= LLE_LINKED;
 1550                 LIST_INSERT_HEAD(lleh, lle, lle_next);
 1551         } else if (flags & LLE_DELETE) {
 1552                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
 1553                         LLE_WLOCK(lle);
 1554                         lle->la_flags |= LLE_DELETED;
 1555 #ifdef DIAGNOSTIC
 1556                         log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
 1557 #endif
 1558                         if ((lle->la_flags &
 1559                             (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
 1560                                 llentry_free(lle);
 1561                         else
 1562                                 LLE_WUNLOCK(lle);
 1563                 }
 1564                 lle = (void *)-1;
 1565                 
 1566         }
 1567         if (LLE_IS_VALID(lle)) {
 1568                 if (flags & LLE_EXCLUSIVE)
 1569                         LLE_WLOCK(lle);
 1570                 else
 1571                         LLE_RLOCK(lle);
 1572         }
 1573 done:
 1574         return (lle);
 1575 }
 1576 
 1577 static int
 1578 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 1579 {
 1580 #define SIN(lle)        ((struct sockaddr_in *) L3_ADDR(lle))
 1581         struct ifnet *ifp = llt->llt_ifp;
 1582         struct llentry *lle;
 1583         /* XXX stack use */
 1584         struct {
 1585                 struct rt_msghdr        rtm;
 1586                 struct sockaddr_inarp   sin;
 1587                 struct sockaddr_dl      sdl;
 1588         } arpc;
 1589         int error, i;
 1590 
 1591         LLTABLE_LOCK_ASSERT();
 1592 
 1593         error = 0;
 1594         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 1595                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
 1596                         struct sockaddr_dl *sdl;
 1597                         
 1598                         /* skip deleted entries */
 1599                         if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
 1600                                 continue;
 1601                         /* Skip if jailed and not a valid IP of the prison. */
 1602                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
 1603                                 continue;
 1604                         /*
 1605                          * produce a msg made of:
 1606                          *  struct rt_msghdr;
 1607                          *  struct sockaddr_inarp; (IPv4)
 1608                          *  struct sockaddr_dl;
 1609                          */
 1610                         bzero(&arpc, sizeof(arpc));
 1611                         arpc.rtm.rtm_msglen = sizeof(arpc);
 1612                         arpc.rtm.rtm_version = RTM_VERSION;
 1613                         arpc.rtm.rtm_type = RTM_GET;
 1614                         arpc.rtm.rtm_flags = RTF_UP;
 1615                         arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 1616                         arpc.sin.sin_family = AF_INET;
 1617                         arpc.sin.sin_len = sizeof(arpc.sin);
 1618                         arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
 1619 
 1620                         /* publish */
 1621                         if (lle->la_flags & LLE_PUB) {
 1622                                 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 1623                                 /* proxy only */
 1624                                 if (lle->la_flags & LLE_PROXY)
 1625                                         arpc.sin.sin_other = SIN_PROXY;
 1626                         }
 1627 
 1628                         sdl = &arpc.sdl;
 1629                         sdl->sdl_family = AF_LINK;
 1630                         sdl->sdl_len = sizeof(*sdl);
 1631                         sdl->sdl_index = ifp->if_index;
 1632                         sdl->sdl_type = ifp->if_type;
 1633                         if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
 1634                                 sdl->sdl_alen = ifp->if_addrlen;
 1635                                 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 1636                         } else {
 1637                                 sdl->sdl_alen = 0;
 1638                                 bzero(LLADDR(sdl), ifp->if_addrlen);
 1639                         }
 1640 
 1641                         arpc.rtm.rtm_rmx.rmx_expire =
 1642                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 1643                         arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 1644                         if (lle->la_flags & LLE_STATIC)
 1645                                 arpc.rtm.rtm_flags |= RTF_STATIC;
 1646                         arpc.rtm.rtm_index = ifp->if_index;
 1647                         error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
 1648                         if (error)
 1649                                 break;
 1650                 }
 1651         }
 1652         return error;
 1653 #undef SIN
 1654 }
 1655 
 1656 void *
 1657 in_domifattach(struct ifnet *ifp)
 1658 {
 1659         struct in_ifinfo *ii;
 1660         struct lltable *llt;
 1661 
 1662         ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
 1663 
 1664         llt = lltable_init(ifp, AF_INET);
 1665         if (llt != NULL) {
 1666                 llt->llt_free = in_lltable_free;
 1667                 llt->llt_prefix_free = in_lltable_prefix_free;
 1668                 llt->llt_lookup = in_lltable_lookup;
 1669                 llt->llt_dump = in_lltable_dump;
 1670         }
 1671         ii->ii_llt = llt;
 1672 
 1673         ii->ii_igmp = igmp_domifattach(ifp);
 1674 
 1675         return ii;
 1676 }
 1677 
 1678 void
 1679 in_domifdetach(struct ifnet *ifp, void *aux)
 1680 {
 1681         struct in_ifinfo *ii = (struct in_ifinfo *)aux;
 1682 
 1683         igmp_domifdetach(ifp);
 1684         lltable_free(ii->ii_llt);
 1685         free(ii, M_IFADDR);
 1686 }

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