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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * Copyright (C) 2001 WIDE Project.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)in.c        8.4 (Berkeley) 1/9/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include "opt_mpath.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/eventhandler.h>
   42 #include <sys/systm.h>
   43 #include <sys/sockio.h>
   44 #include <sys/malloc.h>
   45 #include <sys/priv.h>
   46 #include <sys/socket.h>
   47 #include <sys/jail.h>
   48 #include <sys/kernel.h>
   49 #include <sys/lock.h>
   50 #include <sys/proc.h>
   51 #include <sys/rmlock.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/syslog.h>
   54 #include <sys/sx.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_var.h>
   58 #include <net/if_arp.h>
   59 #include <net/if_dl.h>
   60 #include <net/if_llatbl.h>
   61 #include <net/if_types.h>
   62 #include <net/route.h>
   63 #include <net/vnet.h>
   64 
   65 #include <netinet/if_ether.h>
   66 #include <netinet/in.h>
   67 #include <netinet/in_var.h>
   68 #include <netinet/in_pcb.h>
   69 #include <netinet/ip_var.h>
   70 #include <netinet/ip_carp.h>
   71 #include <netinet/igmp_var.h>
   72 #include <netinet/udp.h>
   73 #include <netinet/udp_var.h>
   74 
   75 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
   76 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
   77 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
   78 
   79 static void     in_socktrim(struct sockaddr_in *);
   80 static void     in_purgemaddrs(struct ifnet *);
   81 
   82 VNET_DEFINE_STATIC(int, nosameprefix);
   83 #define V_nosameprefix                  VNET(nosameprefix)
   84 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
   85         &VNET_NAME(nosameprefix), 0,
   86         "Refuse to create same prefixes on different interfaces");
   87 
   88 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
   89 #define V_ripcbinfo                     VNET(ripcbinfo)
   90 
   91 static struct sx in_control_sx;
   92 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
   93 
   94 /*
   95  * Return 1 if an internet address is for a ``local'' host
   96  * (one to which we have a connection).
   97  */
   98 int
   99 in_localaddr(struct in_addr in)
  100 {
  101         struct rm_priotracker in_ifa_tracker;
  102         u_long i = ntohl(in.s_addr);
  103         struct in_ifaddr *ia;
  104 
  105         IN_IFADDR_RLOCK(&in_ifa_tracker);
  106         CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  107                 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
  108                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  109                         return (1);
  110                 }
  111         }
  112         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  113         return (0);
  114 }
  115 
  116 /*
  117  * Return 1 if an internet address is for the local host and configured
  118  * on one of its interfaces.
  119  */
  120 int
  121 in_localip(struct in_addr in)
  122 {
  123         struct rm_priotracker in_ifa_tracker;
  124         struct in_ifaddr *ia;
  125 
  126         IN_IFADDR_RLOCK(&in_ifa_tracker);
  127         LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
  128                 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
  129                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  130                         return (1);
  131                 }
  132         }
  133         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  134         return (0);
  135 }
  136 
  137 /*
  138  * Return 1 if an internet address is configured on an interface.
  139  */
  140 int
  141 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
  142 {
  143         struct ifaddr *ifa;
  144         struct in_ifaddr *ia;
  145 
  146         IF_ADDR_RLOCK(ifp);
  147         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  148                 if (ifa->ifa_addr->sa_family != AF_INET)
  149                         continue;
  150                 ia = (struct in_ifaddr *)ifa;
  151                 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) {
  152                         IF_ADDR_RUNLOCK(ifp);
  153                         return (1);
  154                 }
  155         }
  156         IF_ADDR_RUNLOCK(ifp);
  157 
  158         return (0);
  159 }
  160 
  161 /*
  162  * Return a reference to the interface address which is different to
  163  * the supplied one but with same IP address value.
  164  */
  165 static struct in_ifaddr *
  166 in_localip_more(struct in_ifaddr *ia)
  167 {
  168         struct rm_priotracker in_ifa_tracker;
  169         in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
  170         struct in_ifaddr *it;
  171 
  172         IN_IFADDR_RLOCK(&in_ifa_tracker);
  173         LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
  174                 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
  175                         ifa_ref(&it->ia_ifa);
  176                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  177                         return (it);
  178                 }
  179         }
  180         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  181 
  182         return (NULL);
  183 }
  184 
  185 /*
  186  * Determine whether an IP address is in a reserved set of addresses
  187  * that may not be forwarded, or whether datagrams to that destination
  188  * may be forwarded.
  189  */
  190 int
  191 in_canforward(struct in_addr in)
  192 {
  193         u_long i = ntohl(in.s_addr);
  194 
  195         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
  196             IN_ZERONET(i) || IN_LOOPBACK(i))
  197                 return (0);
  198         return (1);
  199 }
  200 
  201 /*
  202  * Trim a mask in a sockaddr
  203  */
  204 static void
  205 in_socktrim(struct sockaddr_in *ap)
  206 {
  207     char *cplim = (char *) &ap->sin_addr;
  208     char *cp = (char *) (&ap->sin_addr + 1);
  209 
  210     ap->sin_len = 0;
  211     while (--cp >= cplim)
  212         if (*cp) {
  213             (ap)->sin_len = cp - (char *) (ap) + 1;
  214             break;
  215         }
  216 }
  217 
  218 /*
  219  * Generic internet control operations (ioctl's).
  220  */
  221 int
  222 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
  223     struct thread *td)
  224 {
  225         struct ifreq *ifr = (struct ifreq *)data;
  226         struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
  227         struct ifaddr *ifa;
  228         struct in_ifaddr *ia;
  229         int error;
  230 
  231         if (ifp == NULL)
  232                 return (EADDRNOTAVAIL);
  233 
  234         /*
  235          * Filter out 4 ioctls we implement directly.  Forward the rest
  236          * to specific functions and ifp->if_ioctl().
  237          */
  238         switch (cmd) {
  239         case SIOCGIFADDR:
  240         case SIOCGIFBRDADDR:
  241         case SIOCGIFDSTADDR:
  242         case SIOCGIFNETMASK:
  243                 break;
  244         case SIOCGIFALIAS:
  245                 sx_xlock(&in_control_sx);
  246                 error = in_gifaddr_ioctl(cmd, data, ifp, td);
  247                 sx_xunlock(&in_control_sx);
  248                 return (error);
  249         case SIOCDIFADDR:
  250                 sx_xlock(&in_control_sx);
  251                 error = in_difaddr_ioctl(cmd, data, ifp, td);
  252                 sx_xunlock(&in_control_sx);
  253                 return (error);
  254         case OSIOCAIFADDR:      /* 9.x compat */
  255         case SIOCAIFADDR:
  256                 sx_xlock(&in_control_sx);
  257                 error = in_aifaddr_ioctl(cmd, data, ifp, td);
  258                 sx_xunlock(&in_control_sx);
  259                 return (error);
  260         case SIOCSIFADDR:
  261         case SIOCSIFBRDADDR:
  262         case SIOCSIFDSTADDR:
  263         case SIOCSIFNETMASK:
  264                 /* We no longer support that old commands. */
  265                 return (EINVAL);
  266         default:
  267                 if (ifp->if_ioctl == NULL)
  268                         return (EOPNOTSUPP);
  269                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  270         }
  271 
  272         if (addr->sin_addr.s_addr != INADDR_ANY &&
  273             prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
  274                 return (EADDRNOTAVAIL);
  275 
  276         /*
  277          * Find address for this interface, if it exists.  If an
  278          * address was specified, find that one instead of the
  279          * first one on the interface, if possible.
  280          */
  281         IF_ADDR_RLOCK(ifp);
  282         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  283                 if (ifa->ifa_addr->sa_family != AF_INET)
  284                         continue;
  285                 ia = (struct in_ifaddr *)ifa;
  286                 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
  287                         break;
  288         }
  289         if (ifa == NULL)
  290                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  291                         if (ifa->ifa_addr->sa_family == AF_INET) {
  292                                 ia = (struct in_ifaddr *)ifa;
  293                                 if (prison_check_ip4(td->td_ucred,
  294                                     &ia->ia_addr.sin_addr) == 0)
  295                                         break;
  296                         }
  297 
  298         if (ifa == NULL) {
  299                 IF_ADDR_RUNLOCK(ifp);
  300                 return (EADDRNOTAVAIL);
  301         }
  302 
  303         error = 0;
  304         switch (cmd) {
  305         case SIOCGIFADDR:
  306                 *addr = ia->ia_addr;
  307                 break;
  308 
  309         case SIOCGIFBRDADDR:
  310                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  311                         error = EINVAL;
  312                         break;
  313                 }
  314                 *addr = ia->ia_broadaddr;
  315                 break;
  316 
  317         case SIOCGIFDSTADDR:
  318                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  319                         error = EINVAL;
  320                         break;
  321                 }
  322                 *addr = ia->ia_dstaddr;
  323                 break;
  324 
  325         case SIOCGIFNETMASK:
  326                 *addr = ia->ia_sockmask;
  327                 break;
  328         }
  329 
  330         IF_ADDR_RUNLOCK(ifp);
  331 
  332         return (error);
  333 }
  334 
  335 static int
  336 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
  337 {
  338         const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
  339         const struct sockaddr_in *addr = &ifra->ifra_addr;
  340         const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
  341         const struct sockaddr_in *mask = &ifra->ifra_mask;
  342         const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
  343         const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
  344         struct ifaddr *ifa;
  345         struct in_ifaddr *ia;
  346         bool iaIsFirst;
  347         int error = 0;
  348 
  349         error = priv_check(td, PRIV_NET_ADDIFADDR);
  350         if (error)
  351                 return (error);
  352 
  353         /*
  354          * ifra_addr must be present and be of INET family.
  355          * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
  356          */
  357         if (addr->sin_len != sizeof(struct sockaddr_in) ||
  358             addr->sin_family != AF_INET)
  359                 return (EINVAL);
  360         if (broadaddr->sin_len != 0 &&
  361             (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
  362             broadaddr->sin_family != AF_INET))
  363                 return (EINVAL);
  364         if (mask->sin_len != 0 &&
  365             (mask->sin_len != sizeof(struct sockaddr_in) ||
  366             mask->sin_family != AF_INET))
  367                 return (EINVAL);
  368         if ((ifp->if_flags & IFF_POINTOPOINT) &&
  369             (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
  370              dstaddr->sin_addr.s_addr == INADDR_ANY))
  371                 return (EDESTADDRREQ);
  372         if (vhid != 0 && carp_attach_p == NULL)
  373                 return (EPROTONOSUPPORT);
  374 
  375         /*
  376          * See whether address already exist.
  377          */
  378         iaIsFirst = true;
  379         ia = NULL;
  380         IF_ADDR_RLOCK(ifp);
  381         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  382                 struct in_ifaddr *it;
  383 
  384                 if (ifa->ifa_addr->sa_family != AF_INET)
  385                         continue;
  386 
  387                 it = (struct in_ifaddr *)ifa;
  388                 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
  389                     prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
  390                         ia = it;
  391                 else
  392                         iaIsFirst = false;
  393         }
  394         IF_ADDR_RUNLOCK(ifp);
  395 
  396         if (ia != NULL)
  397                 (void )in_difaddr_ioctl(cmd, data, ifp, td);
  398 
  399         ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
  400         ia = (struct in_ifaddr *)ifa;
  401         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
  402         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
  403         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
  404         callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
  405             CALLOUT_RETURNUNLOCKED);
  406 
  407         ia->ia_ifp = ifp;
  408         ia->ia_addr = *addr;
  409         if (mask->sin_len != 0) {
  410                 ia->ia_sockmask = *mask;
  411                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
  412         } else {
  413                 in_addr_t i = ntohl(addr->sin_addr.s_addr);
  414 
  415                 /*
  416                  * Be compatible with network classes, if netmask isn't
  417                  * supplied, guess it based on classes.
  418                  */
  419                 if (IN_CLASSA(i))
  420                         ia->ia_subnetmask = IN_CLASSA_NET;
  421                 else if (IN_CLASSB(i))
  422                         ia->ia_subnetmask = IN_CLASSB_NET;
  423                 else
  424                         ia->ia_subnetmask = IN_CLASSC_NET;
  425                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
  426         }
  427         ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
  428         in_socktrim(&ia->ia_sockmask);
  429 
  430         if (ifp->if_flags & IFF_BROADCAST) {
  431                 if (broadaddr->sin_len != 0) {
  432                         ia->ia_broadaddr = *broadaddr;
  433                 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
  434                         ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
  435                         ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
  436                         ia->ia_broadaddr.sin_family = AF_INET;
  437                 } else {
  438                         ia->ia_broadaddr.sin_addr.s_addr =
  439                             htonl(ia->ia_subnet | ~ia->ia_subnetmask);
  440                         ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
  441                         ia->ia_broadaddr.sin_family = AF_INET;
  442                 }
  443         }
  444 
  445         if (ifp->if_flags & IFF_POINTOPOINT)
  446                 ia->ia_dstaddr = *dstaddr;
  447 
  448         /* XXXGL: rtinit() needs this strange assignment. */
  449         if (ifp->if_flags & IFF_LOOPBACK)
  450                 ia->ia_dstaddr = ia->ia_addr;
  451 
  452         if (vhid != 0) {
  453                 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
  454                 if (error)
  455                         return (error);
  456         }
  457 
  458         /* if_addrhead is already referenced by ifa_alloc() */
  459         IF_ADDR_WLOCK(ifp);
  460         CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
  461         IF_ADDR_WUNLOCK(ifp);
  462 
  463         ifa_ref(ifa);                   /* in_ifaddrhead */
  464         IN_IFADDR_WLOCK();
  465         CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
  466         LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
  467         IN_IFADDR_WUNLOCK();
  468 
  469         /*
  470          * Give the interface a chance to initialize
  471          * if this is its first address,
  472          * and to validate the address if necessary.
  473          */
  474         if (ifp->if_ioctl != NULL) {
  475                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
  476                 if (error)
  477                         goto fail1;
  478         }
  479 
  480         /*
  481          * Add route for the network.
  482          */
  483         if (vhid == 0) {
  484                 int flags = RTF_UP;
  485 
  486                 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
  487                         flags |= RTF_HOST;
  488 
  489                 error = in_addprefix(ia, flags);
  490                 if (error)
  491                         goto fail1;
  492         }
  493 
  494         /*
  495          * Add a loopback route to self.
  496          */
  497         if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
  498             ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
  499             !((ifp->if_flags & IFF_POINTOPOINT) &&
  500              ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
  501                 struct in_ifaddr *eia;
  502 
  503                 eia = in_localip_more(ia);
  504 
  505                 if (eia == NULL) {
  506                         error = ifa_add_loopback_route((struct ifaddr *)ia,
  507                             (struct sockaddr *)&ia->ia_addr);
  508                         if (error)
  509                                 goto fail2;
  510                 } else
  511                         ifa_free(&eia->ia_ifa);
  512         }
  513 
  514         if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
  515                 struct in_addr allhosts_addr;
  516                 struct in_ifinfo *ii;
  517 
  518                 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
  519                 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
  520 
  521                 error = in_joingroup(ifp, &allhosts_addr, NULL,
  522                         &ii->ii_allhosts);
  523         }
  524 
  525         /*
  526          * Note: we don't need extra reference for ifa, since we called
  527          * with sx lock held, and ifaddr can not be deleted in concurrent
  528          * thread.
  529          */
  530         EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
  531 
  532         return (error);
  533 
  534 fail2:
  535         if (vhid == 0)
  536                 (void )in_scrubprefix(ia, LLE_STATIC);
  537 
  538 fail1:
  539         if (ia->ia_ifa.ifa_carp)
  540                 (*carp_detach_p)(&ia->ia_ifa, false);
  541 
  542         IF_ADDR_WLOCK(ifp);
  543         CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
  544         IF_ADDR_WUNLOCK(ifp);
  545         ifa_free(&ia->ia_ifa);          /* if_addrhead */
  546 
  547         IN_IFADDR_WLOCK();
  548         CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
  549         LIST_REMOVE(ia, ia_hash);
  550         IN_IFADDR_WUNLOCK();
  551         ifa_free(&ia->ia_ifa);          /* in_ifaddrhead */
  552 
  553         return (error);
  554 }
  555 
  556 static int
  557 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
  558 {
  559         const struct ifreq *ifr = (struct ifreq *)data;
  560         const struct sockaddr_in *addr = (const struct sockaddr_in *)
  561             &ifr->ifr_addr;
  562         struct ifaddr *ifa;
  563         struct in_ifaddr *ia;
  564         bool deleteAny, iaIsLast;
  565         int error;
  566 
  567         if (td != NULL) {
  568                 error = priv_check(td, PRIV_NET_DELIFADDR);
  569                 if (error)
  570                         return (error);
  571         }
  572 
  573         if (addr->sin_len != sizeof(struct sockaddr_in) ||
  574             addr->sin_family != AF_INET)
  575                 deleteAny = true;
  576         else
  577                 deleteAny = false;
  578 
  579         iaIsLast = true;
  580         ia = NULL;
  581         IF_ADDR_WLOCK(ifp);
  582         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  583                 struct in_ifaddr *it;
  584 
  585                 if (ifa->ifa_addr->sa_family != AF_INET)
  586                         continue;
  587 
  588                 it = (struct in_ifaddr *)ifa;
  589                 if (deleteAny && ia == NULL && (td == NULL ||
  590                     prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
  591                         ia = it;
  592 
  593                 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
  594                     (td == NULL || prison_check_ip4(td->td_ucred,
  595                     &addr->sin_addr) == 0))
  596                         ia = it;
  597 
  598                 if (it != ia)
  599                         iaIsLast = false;
  600         }
  601 
  602         if (ia == NULL) {
  603                 IF_ADDR_WUNLOCK(ifp);
  604                 return (EADDRNOTAVAIL);
  605         }
  606 
  607         CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
  608         IF_ADDR_WUNLOCK(ifp);
  609         ifa_free(&ia->ia_ifa);          /* if_addrhead */
  610 
  611         IN_IFADDR_WLOCK();
  612         CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
  613         LIST_REMOVE(ia, ia_hash);
  614         IN_IFADDR_WUNLOCK();
  615 
  616         /*
  617          * in_scrubprefix() kills the interface route.
  618          */
  619         in_scrubprefix(ia, LLE_STATIC);
  620 
  621         /*
  622          * in_ifadown gets rid of all the rest of
  623          * the routes.  This is not quite the right
  624          * thing to do, but at least if we are running
  625          * a routing process they will come back.
  626          */
  627         in_ifadown(&ia->ia_ifa, 1);
  628 
  629         if (ia->ia_ifa.ifa_carp)
  630                 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
  631 
  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 (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
  638                 struct in_ifinfo *ii;
  639 
  640                 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
  641                 if (ii->ii_allhosts) {
  642                         (void)in_leavegroup(ii->ii_allhosts, NULL);
  643                         ii->ii_allhosts = NULL;
  644                 }
  645         }
  646 
  647         IF_ADDR_WLOCK(ifp);
  648         if (callout_stop(&ia->ia_garp_timer) == 1) {
  649                 ifa_free(&ia->ia_ifa);
  650         }
  651         IF_ADDR_WUNLOCK(ifp);
  652 
  653         EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
  654             IFADDR_EVENT_DEL);
  655         ifa_free(&ia->ia_ifa);          /* in_ifaddrhead */
  656 
  657         return (0);
  658 }
  659 
  660 static int
  661 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
  662 {
  663         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
  664         const struct sockaddr_in *addr = &ifra->ifra_addr;
  665         struct epoch_tracker et;
  666         struct ifaddr *ifa;
  667         struct in_ifaddr *ia;
  668 
  669         /*
  670          * ifra_addr must be present and be of INET family.
  671          */
  672         if (addr->sin_len != sizeof(struct sockaddr_in) ||
  673             addr->sin_family != AF_INET)
  674                 return (EINVAL);
  675 
  676         /*
  677          * See whether address exist.
  678          */
  679         ia = NULL;
  680         NET_EPOCH_ENTER_ET(et);
  681         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  682                 struct in_ifaddr *it;
  683 
  684                 if (ifa->ifa_addr->sa_family != AF_INET)
  685                         continue;
  686 
  687                 it = (struct in_ifaddr *)ifa;
  688                 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
  689                     prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
  690                         ia = it;
  691                         break;
  692                 }
  693         }
  694         if (ia == NULL) {
  695                 NET_EPOCH_EXIT_ET(et);
  696                 return (EADDRNOTAVAIL);
  697         }
  698 
  699         ifra->ifra_mask = ia->ia_sockmask;
  700         if ((ifp->if_flags & IFF_POINTOPOINT) &&
  701             ia->ia_dstaddr.sin_family == AF_INET)
  702                 ifra->ifra_dstaddr = ia->ia_dstaddr;
  703         else if ((ifp->if_flags & IFF_BROADCAST) &&
  704             ia->ia_broadaddr.sin_family == AF_INET)
  705                 ifra->ifra_broadaddr = ia->ia_broadaddr;
  706         else
  707                 memset(&ifra->ifra_broadaddr, 0,
  708                     sizeof(ifra->ifra_broadaddr));
  709 
  710         NET_EPOCH_EXIT_ET(et);
  711         return (0);
  712 }
  713 
  714 #define rtinitflags(x) \
  715         ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
  716             ? RTF_HOST : 0)
  717 
  718 /*
  719  * Check if we have a route for the given prefix already or add one accordingly.
  720  */
  721 int
  722 in_addprefix(struct in_ifaddr *target, int flags)
  723 {
  724         struct rm_priotracker in_ifa_tracker;
  725         struct in_ifaddr *ia;
  726         struct in_addr prefix, mask, p, m;
  727         int error;
  728 
  729         if ((flags & RTF_HOST) != 0) {
  730                 prefix = target->ia_dstaddr.sin_addr;
  731                 mask.s_addr = 0;
  732         } else {
  733                 prefix = target->ia_addr.sin_addr;
  734                 mask = target->ia_sockmask.sin_addr;
  735                 prefix.s_addr &= mask.s_addr;
  736         }
  737 
  738         IN_IFADDR_RLOCK(&in_ifa_tracker);
  739         /* Look for an existing address with the same prefix, mask, and fib */
  740         CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  741                 if (rtinitflags(ia)) {
  742                         p = ia->ia_dstaddr.sin_addr;
  743 
  744                         if (prefix.s_addr != p.s_addr)
  745                                 continue;
  746                 } else {
  747                         p = ia->ia_addr.sin_addr;
  748                         m = ia->ia_sockmask.sin_addr;
  749                         p.s_addr &= m.s_addr;
  750 
  751                         if (prefix.s_addr != p.s_addr ||
  752                             mask.s_addr != m.s_addr)
  753                                 continue;
  754                 }
  755                 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
  756                         continue;
  757 
  758                 /*
  759                  * If we got a matching prefix route inserted by other
  760                  * interface address, we are done here.
  761                  */
  762                 if (ia->ia_flags & IFA_ROUTE) {
  763 #ifdef RADIX_MPATH
  764                         if (ia->ia_addr.sin_addr.s_addr ==
  765                             target->ia_addr.sin_addr.s_addr) {
  766                                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  767                                 return (EEXIST);
  768                         } else
  769                                 break;
  770 #endif
  771                         if (V_nosameprefix) {
  772                                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  773                                 return (EEXIST);
  774                         } else {
  775                                 int fibnum;
  776 
  777                                 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
  778                                         target->ia_ifp->if_fib;
  779                                 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
  780                                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  781                                 return (0);
  782                         }
  783                 }
  784         }
  785         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  786 
  787         /*
  788          * No-one seem to have this prefix route, so we try to insert it.
  789          */
  790         error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
  791         if (!error)
  792                 target->ia_flags |= IFA_ROUTE;
  793         return (error);
  794 }
  795 
  796 /*
  797  * Removes either all lle entries for given @ia, or lle
  798  * corresponding to @ia address.
  799  */
  800 static void
  801 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
  802 {
  803         struct sockaddr_in addr, mask;
  804         struct sockaddr *saddr, *smask;
  805         struct ifnet *ifp;
  806 
  807         saddr = (struct sockaddr *)&addr;
  808         bzero(&addr, sizeof(addr));
  809         addr.sin_len = sizeof(addr);
  810         addr.sin_family = AF_INET;
  811         smask = (struct sockaddr *)&mask;
  812         bzero(&mask, sizeof(mask));
  813         mask.sin_len = sizeof(mask);
  814         mask.sin_family = AF_INET;
  815         mask.sin_addr.s_addr = ia->ia_subnetmask;
  816         ifp = ia->ia_ifp;
  817 
  818         if (all) {
  819 
  820                 /*
  821                  * Remove all L2 entries matching given prefix.
  822                  * Convert address to host representation to avoid
  823                  * doing this on every callback. ia_subnetmask is already
  824                  * stored in host representation.
  825                  */
  826                 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
  827                 lltable_prefix_free(AF_INET, saddr, smask, flags);
  828         } else {
  829                 /* Remove interface address only */
  830                 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
  831                 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
  832         }
  833 }
  834 
  835 /*
  836  * If there is no other address in the system that can serve a route to the
  837  * same prefix, remove the route.  Hand over the route to the new address
  838  * otherwise.
  839  */
  840 int
  841 in_scrubprefix(struct in_ifaddr *target, u_int flags)
  842 {
  843         struct rm_priotracker in_ifa_tracker;
  844         struct in_ifaddr *ia;
  845         struct in_addr prefix, mask, p, m;
  846         int error = 0;
  847 
  848         /*
  849          * Remove the loopback route to the interface address.
  850          */
  851         if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
  852             !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
  853             (flags & LLE_STATIC)) {
  854                 struct in_ifaddr *eia;
  855 
  856                 /*
  857                  * XXXME: add fib-aware in_localip.
  858                  * We definitely don't want to switch between
  859                  * prefixes in different fibs.
  860                  */
  861                 eia = in_localip_more(target);
  862 
  863                 if (eia != NULL) {
  864                         error = ifa_switch_loopback_route((struct ifaddr *)eia,
  865                             (struct sockaddr *)&target->ia_addr);
  866                         ifa_free(&eia->ia_ifa);
  867                 } else {
  868                         error = ifa_del_loopback_route((struct ifaddr *)target,
  869                             (struct sockaddr *)&target->ia_addr);
  870                 }
  871         }
  872 
  873         if (rtinitflags(target)) {
  874                 prefix = target->ia_dstaddr.sin_addr;
  875                 mask.s_addr = 0;
  876         } else {
  877                 prefix = target->ia_addr.sin_addr;
  878                 mask = target->ia_sockmask.sin_addr;
  879                 prefix.s_addr &= mask.s_addr;
  880         }
  881 
  882         if ((target->ia_flags & IFA_ROUTE) == 0) {
  883                 int fibnum;
  884                 
  885                 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
  886                         target->ia_ifp->if_fib;
  887                 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
  888         
  889                 /*
  890                  * Removing address from !IFF_UP interface or
  891                  * prefix which exists on other interface (along with route).
  892                  * No entries should exist here except target addr.
  893                  * Given that, delete this entry only.
  894                  */
  895                 in_scrubprefixlle(target, 0, flags);
  896                 return (0);
  897         }
  898 
  899         IN_IFADDR_RLOCK(&in_ifa_tracker);
  900         CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
  901                 if (rtinitflags(ia)) {
  902                         p = ia->ia_dstaddr.sin_addr;
  903 
  904                         if (prefix.s_addr != p.s_addr)
  905                                 continue;
  906                 } else {
  907                         p = ia->ia_addr.sin_addr;
  908                         m = ia->ia_sockmask.sin_addr;
  909                         p.s_addr &= m.s_addr;
  910 
  911                         if (prefix.s_addr != p.s_addr ||
  912                             mask.s_addr != m.s_addr)
  913                                 continue;
  914                 }
  915 
  916                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
  917                         continue;
  918 
  919                 /*
  920                  * If we got a matching prefix address, move IFA_ROUTE and
  921                  * the route itself to it.  Make sure that routing daemons
  922                  * get a heads-up.
  923                  */
  924                 if ((ia->ia_flags & IFA_ROUTE) == 0) {
  925                         ifa_ref(&ia->ia_ifa);
  926                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  927                         error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
  928                             rtinitflags(target));
  929                         if (error == 0)
  930                                 target->ia_flags &= ~IFA_ROUTE;
  931                         else
  932                                 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
  933                                         error);
  934                         /* Scrub all entries IFF interface is different */
  935                         in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
  936                             flags);
  937                         error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
  938                             rtinitflags(ia) | RTF_UP);
  939                         if (error == 0)
  940                                 ia->ia_flags |= IFA_ROUTE;
  941                         else
  942                                 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
  943                                         error);
  944                         ifa_free(&ia->ia_ifa);
  945                         return (error);
  946                 }
  947         }
  948         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
  949 
  950         /*
  951          * remove all L2 entries on the given prefix
  952          */
  953         in_scrubprefixlle(target, 1, flags);
  954 
  955         /*
  956          * As no-one seem to have this prefix, we can remove the route.
  957          */
  958         error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
  959         if (error == 0)
  960                 target->ia_flags &= ~IFA_ROUTE;
  961         else
  962                 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
  963         return (error);
  964 }
  965 
  966 #undef rtinitflags
  967 
  968 void
  969 in_ifscrub_all(void)
  970 {
  971         struct ifnet *ifp;
  972         struct ifaddr *ifa, *nifa;
  973         struct ifaliasreq ifr;
  974 
  975         IFNET_RLOCK();
  976         CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  977                 /* Cannot lock here - lock recursion. */
  978                 /* IF_ADDR_RLOCK(ifp); */
  979                 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
  980                         if (ifa->ifa_addr->sa_family != AF_INET)
  981                                 continue;
  982 
  983                         /*
  984                          * This is ugly but the only way for legacy IP to
  985                          * cleanly remove addresses and everything attached.
  986                          */
  987                         bzero(&ifr, sizeof(ifr));
  988                         ifr.ifra_addr = *ifa->ifa_addr;
  989                         if (ifa->ifa_dstaddr)
  990                         ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
  991                         (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
  992                             ifp, NULL);
  993                 }
  994                 /* IF_ADDR_RUNLOCK(ifp); */
  995                 in_purgemaddrs(ifp);
  996                 igmp_domifdetach(ifp);
  997         }
  998         IFNET_RUNLOCK();
  999 }
 1000 
 1001 int
 1002 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
 1003 {
 1004 
 1005         return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
 1006              /*
 1007               * Check for old-style (host 0) broadcast, but
 1008               * taking into account that RFC 3021 obsoletes it.
 1009               */
 1010             (ia->ia_subnetmask != IN_RFC3021_MASK &&
 1011             ntohl(in.s_addr) == ia->ia_subnet)) &&
 1012              /*
 1013               * Check for an all one subnetmask. These
 1014               * only exist when an interface gets a secondary
 1015               * address.
 1016               */
 1017             ia->ia_subnetmask != (u_long)0xffffffff);
 1018 }
 1019 
 1020 /*
 1021  * Return 1 if the address might be a local broadcast address.
 1022  */
 1023 int
 1024 in_broadcast(struct in_addr in, struct ifnet *ifp)
 1025 {
 1026         struct ifaddr *ifa;
 1027         int found;
 1028 
 1029         if (in.s_addr == INADDR_BROADCAST ||
 1030             in.s_addr == INADDR_ANY)
 1031                 return (1);
 1032         if ((ifp->if_flags & IFF_BROADCAST) == 0)
 1033                 return (0);
 1034         found = 0;
 1035         /*
 1036          * Look through the list of addresses for a match
 1037          * with a broadcast address.
 1038          */
 1039         IF_ADDR_RLOCK(ifp);
 1040         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 1041                 if (ifa->ifa_addr->sa_family == AF_INET &&
 1042                     in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
 1043                         found = 1;
 1044                         break;
 1045                 }
 1046         IF_ADDR_RUNLOCK(ifp);
 1047         return (found);
 1048 }
 1049 
 1050 /*
 1051  * On interface removal, clean up IPv4 data structures hung off of the ifnet.
 1052  */
 1053 void
 1054 in_ifdetach(struct ifnet *ifp)
 1055 {
 1056         IN_MULTI_LOCK();
 1057         in_pcbpurgeif0(&V_ripcbinfo, ifp);
 1058         in_pcbpurgeif0(&V_udbinfo, ifp);
 1059         in_pcbpurgeif0(&V_ulitecbinfo, ifp);
 1060         in_purgemaddrs(ifp);
 1061         IN_MULTI_UNLOCK();
 1062 
 1063         /*
 1064          * Make sure all multicast deletions invoking if_ioctl() are
 1065          * completed before returning. Else we risk accessing a freed
 1066          * ifnet structure pointer.
 1067          */
 1068         inm_release_wait(NULL);
 1069 }
 1070 
 1071 /*
 1072  * Delete all IPv4 multicast address records, and associated link-layer
 1073  * multicast address records, associated with ifp.
 1074  * XXX It looks like domifdetach runs AFTER the link layer cleanup.
 1075  * XXX This should not race with ifma_protospec being set during
 1076  * a new allocation, if it does, we have bigger problems.
 1077  */
 1078 static void
 1079 in_purgemaddrs(struct ifnet *ifp)
 1080 {
 1081         struct in_multi_head purgeinms;
 1082         struct in_multi         *inm;
 1083         struct ifmultiaddr      *ifma, *next;
 1084 
 1085         SLIST_INIT(&purgeinms);
 1086         IN_MULTI_LIST_LOCK();
 1087 
 1088         /*
 1089          * Extract list of in_multi associated with the detaching ifp
 1090          * which the PF_INET layer is about to release.
 1091          * We need to do this as IF_ADDR_LOCK() may be re-acquired
 1092          * by code further down.
 1093          */
 1094         IF_ADDR_WLOCK(ifp);
 1095  restart:
 1096         CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
 1097                 if (ifma->ifma_addr->sa_family != AF_INET ||
 1098                     ifma->ifma_protospec == NULL)
 1099                         continue;
 1100                 inm = (struct in_multi *)ifma->ifma_protospec;
 1101                 inm_rele_locked(&purgeinms, inm);
 1102                 if (__predict_false(ifma_restart)) {
 1103                         ifma_restart = true;
 1104                         goto restart;
 1105                 }
 1106         }
 1107         IF_ADDR_WUNLOCK(ifp);
 1108 
 1109         inm_release_list_deferred(&purgeinms);
 1110         igmp_ifdetach(ifp);
 1111         IN_MULTI_LIST_UNLOCK();
 1112 }
 1113 
 1114 struct in_llentry {
 1115         struct llentry          base;
 1116 };
 1117 
 1118 #define IN_LLTBL_DEFAULT_HSIZE  32
 1119 #define IN_LLTBL_HASH(k, h) \
 1120         (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
 1121 
 1122 /*
 1123  * Do actual deallocation of @lle.
 1124  */
 1125 static void
 1126 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
 1127 {
 1128         struct llentry *lle;
 1129 
 1130         lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
 1131         LLE_LOCK_DESTROY(lle);
 1132         LLE_REQ_DESTROY(lle);
 1133         free(lle, M_LLTABLE);
 1134 }
 1135 
 1136 /*
 1137  * Called by the datapath to indicate that
 1138  * the entry was used.
 1139  */
 1140 static void
 1141 in_lltable_mark_used(struct llentry *lle)
 1142 {
 1143 
 1144         LLE_REQ_LOCK(lle);
 1145         lle->r_skip_req = 0;
 1146         LLE_REQ_UNLOCK(lle);
 1147 }
 1148 
 1149 /*
 1150  * Called by LLE_FREE_LOCKED when number of references
 1151  * drops to zero.
 1152  */
 1153 static void
 1154 in_lltable_destroy_lle(struct llentry *lle)
 1155 {
 1156 
 1157         LLE_WUNLOCK(lle);
 1158         epoch_call(net_epoch_preempt,  &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked);
 1159 }
 1160 
 1161 static struct llentry *
 1162 in_lltable_new(struct in_addr addr4, u_int flags)
 1163 {
 1164         struct in_llentry *lle;
 1165 
 1166         lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
 1167         if (lle == NULL)                /* NB: caller generates msg */
 1168                 return NULL;
 1169 
 1170         /*
 1171          * For IPv4 this will trigger "arpresolve" to generate
 1172          * an ARP request.
 1173          */
 1174         lle->base.la_expire = time_uptime; /* mark expired */
 1175         lle->base.r_l3addr.addr4 = addr4;
 1176         lle->base.lle_refcnt = 1;
 1177         lle->base.lle_free = in_lltable_destroy_lle;
 1178         LLE_LOCK_INIT(&lle->base);
 1179         LLE_REQ_INIT(&lle->base);
 1180         callout_init(&lle->base.lle_timer, 1);
 1181 
 1182         return (&lle->base);
 1183 }
 1184 
 1185 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)       (               \
 1186         ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
 1187 
 1188 static int
 1189 in_lltable_match_prefix(const struct sockaddr *saddr,
 1190     const struct sockaddr *smask, u_int flags, struct llentry *lle)
 1191 {
 1192         struct in_addr addr, mask, lle_addr;
 1193 
 1194         addr = ((const struct sockaddr_in *)saddr)->sin_addr;
 1195         mask = ((const struct sockaddr_in *)smask)->sin_addr;
 1196         lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
 1197 
 1198         if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
 1199                 return (0);
 1200 
 1201         if (lle->la_flags & LLE_IFADDR) {
 1202 
 1203                 /*
 1204                  * Delete LLE_IFADDR records IFF address & flag matches.
 1205                  * Note that addr is the interface address within prefix
 1206                  * being matched.
 1207                  * Note also we should handle 'ifdown' cases without removing
 1208                  * ifaddr macs.
 1209                  */
 1210                 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
 1211                         return (1);
 1212                 return (0);
 1213         }
 1214 
 1215         /* flags & LLE_STATIC means deleting both dynamic and static entries */
 1216         if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
 1217                 return (1);
 1218 
 1219         return (0);
 1220 }
 1221 
 1222 static void
 1223 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
 1224 {
 1225         size_t pkts_dropped;
 1226 
 1227         LLE_WLOCK_ASSERT(lle);
 1228         KASSERT(llt != NULL, ("lltable is NULL"));
 1229 
 1230         /* Unlink entry from table if not already */
 1231         if ((lle->la_flags & LLE_LINKED) != 0) {
 1232                 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
 1233                 lltable_unlink_entry(llt, lle);
 1234         }
 1235 
 1236         /* Drop hold queue */
 1237         pkts_dropped = llentry_free(lle);
 1238         ARPSTAT_ADD(dropped, pkts_dropped);
 1239 }
 1240 
 1241 static int
 1242 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
 1243 {
 1244         struct rt_addrinfo info;
 1245         struct sockaddr_in rt_key, rt_mask;
 1246         struct sockaddr rt_gateway;
 1247         int rt_flags;
 1248 
 1249         KASSERT(l3addr->sa_family == AF_INET,
 1250             ("sin_family %d", l3addr->sa_family));
 1251 
 1252         bzero(&rt_key, sizeof(rt_key));
 1253         rt_key.sin_len = sizeof(rt_key);
 1254         bzero(&rt_mask, sizeof(rt_mask));
 1255         rt_mask.sin_len = sizeof(rt_mask);
 1256         bzero(&rt_gateway, sizeof(rt_gateway));
 1257         rt_gateway.sa_len = sizeof(rt_gateway);
 1258 
 1259         bzero(&info, sizeof(info));
 1260         info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
 1261         info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
 1262         info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
 1263 
 1264         if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
 1265                 return (EINVAL);
 1266 
 1267         rt_flags = info.rti_flags;
 1268 
 1269         /*
 1270          * If the gateway for an existing host route matches the target L3
 1271          * address, which is a special route inserted by some implementation
 1272          * such as MANET, and the interface is of the correct type, then
 1273          * allow for ARP to proceed.
 1274          */
 1275         if (rt_flags & RTF_GATEWAY) {
 1276                 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
 1277                     info.rti_ifp->if_type != IFT_ETHER ||
 1278                     (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
 1279                     memcmp(rt_gateway.sa_data, l3addr->sa_data,
 1280                     sizeof(in_addr_t)) != 0) {
 1281                         rib_free_info(&info);
 1282                         return (EINVAL);
 1283                 }
 1284         }
 1285         rib_free_info(&info);
 1286 
 1287         /*
 1288          * Make sure that at least the destination address is covered
 1289          * by the route. This is for handling the case where 2 or more
 1290          * interfaces have the same prefix. An incoming packet arrives
 1291          * on one interface and the corresponding outgoing packet leaves
 1292          * another interface.
 1293          */
 1294         if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
 1295                 const char *sa, *mask, *addr, *lim;
 1296                 const struct sockaddr_in *l3sin;
 1297 
 1298                 mask = (const char *)&rt_mask;
 1299                 /*
 1300                  * Just being extra cautious to avoid some custom
 1301                  * code getting into trouble.
 1302                  */
 1303                 if ((info.rti_addrs & RTA_NETMASK) == 0)
 1304                         return (EINVAL);
 1305 
 1306                 sa = (const char *)&rt_key;
 1307                 addr = (const char *)l3addr;
 1308                 l3sin = (const struct sockaddr_in *)l3addr;
 1309                 lim = addr + l3sin->sin_len;
 1310 
 1311                 for ( ; addr < lim; sa++, mask++, addr++) {
 1312                         if ((*sa ^ *addr) & *mask) {
 1313 #ifdef DIAGNOSTIC
 1314                                 char addrbuf[INET_ADDRSTRLEN];
 1315 
 1316                                 log(LOG_INFO, "IPv4 address: \"%s\" "
 1317                                     "is not on the network\n",
 1318                                     inet_ntoa_r(l3sin->sin_addr, addrbuf));
 1319 #endif
 1320                                 return (EINVAL);
 1321                         }
 1322                 }
 1323         }
 1324 
 1325         return (0);
 1326 }
 1327 
 1328 static inline uint32_t
 1329 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
 1330 {
 1331 
 1332         return (IN_LLTBL_HASH(dst.s_addr, hsize));
 1333 }
 1334 
 1335 static uint32_t
 1336 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
 1337 {
 1338 
 1339         return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
 1340 }
 1341 
 1342 static void
 1343 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
 1344 {
 1345         struct sockaddr_in *sin;
 1346 
 1347         sin = (struct sockaddr_in *)sa;
 1348         bzero(sin, sizeof(*sin));
 1349         sin->sin_family = AF_INET;
 1350         sin->sin_len = sizeof(*sin);
 1351         sin->sin_addr = lle->r_l3addr.addr4;
 1352 }
 1353 
 1354 static inline struct llentry *
 1355 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
 1356 {
 1357         struct llentry *lle;
 1358         struct llentries *lleh;
 1359         u_int hashidx;
 1360 
 1361         hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
 1362         lleh = &llt->lle_head[hashidx];
 1363         CK_LIST_FOREACH(lle, lleh, lle_next) {
 1364                 if (lle->la_flags & LLE_DELETED)
 1365                         continue;
 1366                 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
 1367                         break;
 1368         }
 1369 
 1370         return (lle);
 1371 }
 1372 
 1373 static void
 1374 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
 1375 {
 1376 
 1377         lle->la_flags |= LLE_DELETED;
 1378         EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
 1379 #ifdef DIAGNOSTIC
 1380         log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
 1381 #endif
 1382         llentry_free(lle);
 1383 }
 1384 
 1385 static struct llentry *
 1386 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
 1387 {
 1388         const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
 1389         struct ifnet *ifp = llt->llt_ifp;
 1390         struct llentry *lle;
 1391         char linkhdr[LLE_MAX_LINKHDR];
 1392         size_t linkhdrsize;
 1393         int lladdr_off;
 1394 
 1395         KASSERT(l3addr->sa_family == AF_INET,
 1396             ("sin_family %d", l3addr->sa_family));
 1397 
 1398         /*
 1399          * A route that covers the given address must have
 1400          * been installed 1st because we are doing a resolution,
 1401          * verify this.
 1402          */
 1403         if (!(flags & LLE_IFADDR) &&
 1404             in_lltable_rtcheck(ifp, flags, l3addr) != 0)
 1405                 return (NULL);
 1406 
 1407         lle = in_lltable_new(sin->sin_addr, flags);
 1408         if (lle == NULL) {
 1409                 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 1410                 return (NULL);
 1411         }
 1412         lle->la_flags = flags;
 1413         if (flags & LLE_STATIC)
 1414                 lle->r_flags |= RLLE_VALID;
 1415         if ((flags & LLE_IFADDR) == LLE_IFADDR) {
 1416                 linkhdrsize = LLE_MAX_LINKHDR;
 1417                 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
 1418                     linkhdr, &linkhdrsize, &lladdr_off) != 0) {
 1419                         epoch_call(net_epoch_preempt,  &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked);
 1420                         return (NULL);
 1421                 }
 1422                 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
 1423                     lladdr_off);
 1424                 lle->la_flags |= LLE_STATIC;
 1425                 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
 1426         }
 1427 
 1428         return (lle);
 1429 }
 1430 
 1431 /*
 1432  * Return NULL if not found or marked for deletion.
 1433  * If found return lle read locked.
 1434  */
 1435 static struct llentry *
 1436 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
 1437 {
 1438         const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
 1439         struct llentry *lle;
 1440 
 1441         IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
 1442         KASSERT(l3addr->sa_family == AF_INET,
 1443             ("sin_family %d", l3addr->sa_family));
 1444         KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
 1445             (LLE_UNLOCKED | LLE_EXCLUSIVE),
 1446             ("wrong lle request flags: %#x", flags));
 1447 
 1448         lle = in_lltable_find_dst(llt, sin->sin_addr);
 1449         if (lle == NULL)
 1450                 return (NULL);
 1451         if (flags & LLE_UNLOCKED)
 1452                 return (lle);
 1453 
 1454         if (flags & LLE_EXCLUSIVE)
 1455                 LLE_WLOCK(lle);
 1456         else
 1457                 LLE_RLOCK(lle);
 1458 
 1459         /*
 1460          * If the afdata lock is not held, the LLE may have been unlinked while
 1461          * we were blocked on the LLE lock.  Check for this case.
 1462          */
 1463         if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
 1464                 if (flags & LLE_EXCLUSIVE)
 1465                         LLE_WUNLOCK(lle);
 1466                 else
 1467                         LLE_RUNLOCK(lle);
 1468                 return (NULL);
 1469         }
 1470         return (lle);
 1471 }
 1472 
 1473 static int
 1474 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
 1475     struct sysctl_req *wr)
 1476 {
 1477         struct ifnet *ifp = llt->llt_ifp;
 1478         /* XXX stack use */
 1479         struct {
 1480                 struct rt_msghdr        rtm;
 1481                 struct sockaddr_in      sin;
 1482                 struct sockaddr_dl      sdl;
 1483         } arpc;
 1484         struct sockaddr_dl *sdl;
 1485         int error;
 1486 
 1487         bzero(&arpc, sizeof(arpc));
 1488         /* skip deleted entries */
 1489         if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
 1490                 return (0);
 1491         /* Skip if jailed and not a valid IP of the prison. */
 1492         lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
 1493         if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
 1494                 return (0);
 1495         /*
 1496          * produce a msg made of:
 1497          *  struct rt_msghdr;
 1498          *  struct sockaddr_in; (IPv4)
 1499          *  struct sockaddr_dl;
 1500          */
 1501         arpc.rtm.rtm_msglen = sizeof(arpc);
 1502         arpc.rtm.rtm_version = RTM_VERSION;
 1503         arpc.rtm.rtm_type = RTM_GET;
 1504         arpc.rtm.rtm_flags = RTF_UP;
 1505         arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 1506 
 1507         /* publish */
 1508         if (lle->la_flags & LLE_PUB)
 1509                 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 1510 
 1511         sdl = &arpc.sdl;
 1512         sdl->sdl_family = AF_LINK;
 1513         sdl->sdl_len = sizeof(*sdl);
 1514         sdl->sdl_index = ifp->if_index;
 1515         sdl->sdl_type = ifp->if_type;
 1516         if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
 1517                 sdl->sdl_alen = ifp->if_addrlen;
 1518                 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 1519         } else {
 1520                 sdl->sdl_alen = 0;
 1521                 bzero(LLADDR(sdl), ifp->if_addrlen);
 1522         }
 1523 
 1524         arpc.rtm.rtm_rmx.rmx_expire =
 1525             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 1526         arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 1527         if (lle->la_flags & LLE_STATIC)
 1528                 arpc.rtm.rtm_flags |= RTF_STATIC;
 1529         if (lle->la_flags & LLE_IFADDR)
 1530                 arpc.rtm.rtm_flags |= RTF_PINNED;
 1531         arpc.rtm.rtm_index = ifp->if_index;
 1532         error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
 1533 
 1534         return (error);
 1535 }
 1536 
 1537 static struct lltable *
 1538 in_lltattach(struct ifnet *ifp)
 1539 {
 1540         struct lltable *llt;
 1541 
 1542         llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
 1543         llt->llt_af = AF_INET;
 1544         llt->llt_ifp = ifp;
 1545 
 1546         llt->llt_lookup = in_lltable_lookup;
 1547         llt->llt_alloc_entry = in_lltable_alloc;
 1548         llt->llt_delete_entry = in_lltable_delete_entry;
 1549         llt->llt_dump_entry = in_lltable_dump_entry;
 1550         llt->llt_hash = in_lltable_hash;
 1551         llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
 1552         llt->llt_free_entry = in_lltable_free_entry;
 1553         llt->llt_match_prefix = in_lltable_match_prefix;
 1554         llt->llt_mark_used = in_lltable_mark_used;
 1555         lltable_link(llt);
 1556 
 1557         return (llt);
 1558 }
 1559 
 1560 void *
 1561 in_domifattach(struct ifnet *ifp)
 1562 {
 1563         struct in_ifinfo *ii;
 1564 
 1565         ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
 1566 
 1567         ii->ii_llt = in_lltattach(ifp);
 1568         ii->ii_igmp = igmp_domifattach(ifp);
 1569 
 1570         return (ii);
 1571 }
 1572 
 1573 void
 1574 in_domifdetach(struct ifnet *ifp, void *aux)
 1575 {
 1576         struct in_ifinfo *ii = (struct in_ifinfo *)aux;
 1577 
 1578         igmp_domifdetach(ifp);
 1579         lltable_free(ii->ii_llt);
 1580         free(ii, M_IFADDR);
 1581 }

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