The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_ethersubr.c

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    1 /*-
    2  * Copyright (c) 1982, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.177.2.12 2006/03/04 09:24:30 oleg Exp $
   31  */
   32 
   33 #include "opt_atalk.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 #include "opt_ipx.h"
   37 #include "opt_bdg.h"
   38 #include "opt_mac.h"
   39 #include "opt_netgraph.h"
   40 #include "opt_carp.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/mac.h>
   46 #include <sys/malloc.h>
   47 #include <sys/module.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/random.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 #include <sys/sysctl.h>
   53 
   54 #include <net/if.h>
   55 #include <net/if_arp.h>
   56 #include <net/netisr.h>
   57 #include <net/route.h>
   58 #include <net/if_llc.h>
   59 #include <net/if_dl.h>
   60 #include <net/if_types.h>
   61 #include <net/bpf.h>
   62 #include <net/ethernet.h>
   63 #include <net/bridge.h>
   64 #include <net/if_bridgevar.h>
   65 #include <net/if_vlan_var.h>
   66 
   67 #if defined(INET) || defined(INET6)
   68 #include <netinet/in.h>
   69 #include <netinet/in_var.h>
   70 #include <netinet/if_ether.h>
   71 #include <netinet/ip_fw.h>
   72 #include <netinet/ip_dummynet.h>
   73 #endif
   74 #ifdef INET6
   75 #include <netinet6/nd6.h>
   76 #endif
   77 
   78 #ifdef DEV_CARP
   79 #include <netinet/ip_carp.h>
   80 #endif
   81 
   82 #ifdef IPX
   83 #include <netipx/ipx.h>
   84 #include <netipx/ipx_if.h>
   85 #endif
   86 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
   87 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
   88                 struct sockaddr *dst, short *tp, int *hlen);
   89 
   90 #ifdef NETATALK
   91 #include <netatalk/at.h>
   92 #include <netatalk/at_var.h>
   93 #include <netatalk/at_extern.h>
   94 
   95 #define llc_snap_org_code llc_un.type_snap.org_code
   96 #define llc_snap_ether_type llc_un.type_snap.ether_type
   97 
   98 extern u_char   at_org_code[3];
   99 extern u_char   aarp_org_code[3];
  100 #endif /* NETATALK */
  101 
  102 /* netgraph node hooks for ng_ether(4) */
  103 void    (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
  104 void    (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
  105 int     (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
  106 void    (*ng_ether_attach_p)(struct ifnet *ifp);
  107 void    (*ng_ether_detach_p)(struct ifnet *ifp);
  108 
  109 void    (*vlan_input_p)(struct ifnet *, struct mbuf *);
  110 
  111 /* bridge support */
  112 int do_bridge;
  113 bridge_in_t *bridge_in_ptr;
  114 bdg_forward_t *bdg_forward_ptr;
  115 bdgtakeifaces_t *bdgtakeifaces_ptr;
  116 struct bdg_softc *ifp2sc;
  117 
  118 /* if_bridge(4) support */
  119 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 
  120 int     (*bridge_output_p)(struct ifnet *, struct mbuf *, 
  121                 struct sockaddr *, struct rtentry *);
  122 void    (*bridge_dn_p)(struct mbuf *, struct ifnet *);
  123 
  124 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
  125                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  126 
  127 static  int ether_resolvemulti(struct ifnet *, struct sockaddr **,
  128                 struct sockaddr *);
  129 
  130 #define senderr(e) do { error = (e); goto bad;} while (0)
  131 
  132 #if defined(INET) || defined(INET6)
  133 int
  134 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
  135         struct ip_fw **rule, int shared);
  136 static int ether_ipfw;
  137 #endif
  138 
  139 /*
  140  * Ethernet output routine.
  141  * Encapsulate a packet of type family for the local net.
  142  * Use trailer local net encapsulation if enough data in first
  143  * packet leaves a multiple of 512 bytes of data in remainder.
  144  * Assumes that ifp is actually pointer to arpcom structure.
  145  */
  146 int
  147 ether_output(struct ifnet *ifp, struct mbuf *m,
  148         struct sockaddr *dst, struct rtentry *rt0)
  149 {
  150         short type;
  151         int error, hdrcmplt = 0;
  152         u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
  153         struct ether_header *eh;
  154         int loop_copy = 1;
  155         int hlen;       /* link layer header length */
  156 
  157 #ifdef MAC
  158         error = mac_check_ifnet_transmit(ifp, m);
  159         if (error)
  160                 senderr(error);
  161 #endif
  162 
  163         if (ifp->if_flags & IFF_MONITOR)
  164                 senderr(ENETDOWN);
  165         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
  166                 senderr(ENETDOWN);
  167 
  168         hlen = ETHER_HDR_LEN;
  169         switch (dst->sa_family) {
  170 #ifdef INET
  171         case AF_INET:
  172                 error = arpresolve(ifp, rt0, m, dst, edst);
  173                 if (error)
  174                         return (error == EWOULDBLOCK ? 0 : error);
  175                 type = htons(ETHERTYPE_IP);
  176                 break;
  177         case AF_ARP:
  178         {
  179                 struct arphdr *ah;
  180                 ah = mtod(m, struct arphdr *);
  181                 ah->ar_hrd = htons(ARPHRD_ETHER);
  182 
  183                 loop_copy = 0; /* if this is for us, don't do it */
  184 
  185                 switch(ntohs(ah->ar_op)) {
  186                 case ARPOP_REVREQUEST:
  187                 case ARPOP_REVREPLY:
  188                         type = htons(ETHERTYPE_REVARP);
  189                         break;
  190                 case ARPOP_REQUEST:
  191                 case ARPOP_REPLY:
  192                 default:
  193                         type = htons(ETHERTYPE_ARP);
  194                         break;
  195                 }
  196 
  197                 if (m->m_flags & M_BCAST)
  198                         bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
  199                 else
  200                         bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
  201 
  202         }
  203         break;
  204 #endif
  205 #ifdef INET6
  206         case AF_INET6:
  207                 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst);
  208                 if (error)
  209                         return error;
  210                 type = htons(ETHERTYPE_IPV6);
  211                 break;
  212 #endif
  213 #ifdef IPX
  214         case AF_IPX:
  215                 if (ef_outputp) {
  216                     error = ef_outputp(ifp, &m, dst, &type, &hlen);
  217                     if (error)
  218                         goto bad;
  219                 } else
  220                     type = htons(ETHERTYPE_IPX);
  221                 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
  222                     (caddr_t)edst, sizeof (edst));
  223                 break;
  224 #endif
  225 #ifdef NETATALK
  226         case AF_APPLETALK:
  227           {
  228             struct at_ifaddr *aa;
  229 
  230             if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
  231                     senderr(EHOSTUNREACH); /* XXX */
  232             if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst))
  233                     return (0);
  234             /*
  235              * In the phase 2 case, need to prepend an mbuf for the llc header.
  236              */
  237             if ( aa->aa_flags & AFA_PHASE2 ) {
  238                 struct llc llc;
  239 
  240                 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
  241                 if (m == NULL)
  242                         senderr(ENOBUFS);
  243                 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
  244                 llc.llc_control = LLC_UI;
  245                 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
  246                 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
  247                 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
  248                 type = htons(m->m_pkthdr.len);
  249                 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
  250             } else {
  251                 type = htons(ETHERTYPE_AT);
  252             }
  253             break;
  254           }
  255 #endif /* NETATALK */
  256 
  257         case pseudo_AF_HDRCMPLT:
  258                 hdrcmplt = 1;
  259                 eh = (struct ether_header *)dst->sa_data;
  260                 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
  261                 /* FALLTHROUGH */
  262 
  263         case AF_UNSPEC:
  264                 loop_copy = 0; /* if this is for us, don't do it */
  265                 eh = (struct ether_header *)dst->sa_data;
  266                 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
  267                 type = eh->ether_type;
  268                 break;
  269 
  270         default:
  271                 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
  272                 senderr(EAFNOSUPPORT);
  273         }
  274 
  275         /*
  276          * Add local net header.  If no space in first mbuf,
  277          * allocate another.
  278          */
  279         M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
  280         if (m == NULL)
  281                 senderr(ENOBUFS);
  282         eh = mtod(m, struct ether_header *);
  283         (void)memcpy(&eh->ether_type, &type,
  284                 sizeof(eh->ether_type));
  285         (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
  286         if (hdrcmplt)
  287                 (void)memcpy(eh->ether_shost, esrc,
  288                         sizeof(eh->ether_shost));
  289         else
  290                 (void)memcpy(eh->ether_shost, IFP2AC(ifp)->ac_enaddr,
  291                         sizeof(eh->ether_shost));
  292 
  293        /*
  294         * Bridges require special output handling.
  295         */
  296         if (ifp->if_bridge) {
  297                 BRIDGE_OUTPUT(ifp, m, error);
  298                 return (error);
  299         }
  300 
  301         /*
  302          * If a simplex interface, and the packet is being sent to our
  303          * Ethernet address or a broadcast address, loopback a copy.
  304          * XXX To make a simplex device behave exactly like a duplex
  305          * device, we should copy in the case of sending to our own
  306          * ethernet address (thus letting the original actually appear
  307          * on the wire). However, we don't do that here for security
  308          * reasons and compatibility with the original behavior.
  309          */
  310         if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
  311             m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) {
  312                 int csum_flags = 0;
  313 
  314                 if (m->m_pkthdr.csum_flags & CSUM_IP)
  315                         csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
  316                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
  317                         csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
  318 
  319                 if (m->m_flags & M_BCAST) {
  320                         struct mbuf *n;
  321 
  322                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  323                                 n->m_pkthdr.csum_flags |= csum_flags;
  324                                 if (csum_flags & CSUM_DATA_VALID)
  325                                         n->m_pkthdr.csum_data = 0xffff;
  326                                 (void)if_simloop(ifp, n, dst->sa_family, hlen);
  327                         } else
  328                                 ifp->if_iqdrops++;
  329                 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
  330                                 ETHER_ADDR_LEN) == 0) {
  331                         m->m_pkthdr.csum_flags |= csum_flags;
  332                         if (csum_flags & CSUM_DATA_VALID)
  333                                 m->m_pkthdr.csum_data = 0xffff;
  334                         (void) if_simloop(ifp, m, dst->sa_family, hlen);
  335                         return (0);     /* XXX */
  336                 }
  337         }
  338 
  339 #ifdef DEV_CARP
  340         if (ifp->if_carp &&
  341             (error = carp_output(ifp, m, dst, NULL)))
  342                 goto bad;
  343 #endif
  344 
  345         /* Handle ng_ether(4) processing, if any */
  346         if (ng_ether_output_p != NULL) {
  347                 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
  348 bad:                    if (m != NULL)
  349                                 m_freem(m);
  350                         return (error);
  351                 }
  352                 if (m == NULL)
  353                         return (0);
  354         }
  355 
  356         /* Continue with link-layer output */
  357         return ether_output_frame(ifp, m);
  358 }
  359 
  360 /*
  361  * Ethernet link layer output routine to send a raw frame to the device.
  362  *
  363  * This assumes that the 14 byte Ethernet header is present and contiguous
  364  * in the first mbuf (if BRIDGE'ing).
  365  */
  366 int
  367 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
  368 {
  369 #if defined(INET) || defined(INET6)
  370         struct ip_fw *rule = ip_dn_claim_rule(m);
  371 #else
  372         void *rule = NULL;
  373 #endif
  374         int error;
  375 
  376         if (rule == NULL && BDG_ACTIVE(ifp)) {
  377                 /*
  378                  * Beware, the bridge code notices the null rcvif and
  379                  * uses that identify that it's being called from
  380                  * ether_output as opposd to ether_input.  Yech.
  381                  */
  382                 m->m_pkthdr.rcvif = NULL;
  383                 m = bdg_forward_ptr(m, ifp);
  384                 if (m != NULL)
  385                         m_freem(m);
  386                 return (0);
  387         }
  388 #if defined(INET) || defined(INET6)
  389         if (IPFW_LOADED && ether_ipfw != 0) {
  390                 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) {
  391                         if (m) {
  392                                 m_freem(m);
  393                                 return EACCES;  /* pkt dropped */
  394                         } else
  395                                 return 0;       /* consumed e.g. in a pipe */
  396                 }
  397         }
  398 #endif
  399 
  400         /*
  401          * Queue message on interface, update output statistics if
  402          * successful, and start output if interface not yet active.
  403          */
  404         IFQ_HANDOFF(ifp, m, error);
  405         return (error);
  406 }
  407 
  408 #if defined(INET) || defined(INET6)
  409 /*
  410  * ipfw processing for ethernet packets (in and out).
  411  * The second parameter is NULL from ether_demux, and ifp from
  412  * ether_output_frame. This section of code could be used from
  413  * bridge.c as well as long as we use some extra info
  414  * to distinguish that case from ether_output_frame();
  415  */
  416 int
  417 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
  418         struct ip_fw **rule, int shared)
  419 {
  420         struct ether_header *eh;
  421         struct ether_header save_eh;
  422         struct mbuf *m;
  423         int i;
  424         struct ip_fw_args args;
  425 
  426         if (*rule != NULL && fw_one_pass)
  427                 return 1; /* dummynet packet, already partially processed */
  428 
  429         /*
  430          * I need some amt of data to be contiguous, and in case others need
  431          * the packet (shared==1) also better be in the first mbuf.
  432          */
  433         m = *m0;
  434         i = min( m->m_pkthdr.len, max_protohdr);
  435         if ( shared || m->m_len < i) {
  436                 m = m_pullup(m, i);
  437                 if (m == NULL) {
  438                         *m0 = m;
  439                         return 0;
  440                 }
  441         }
  442         eh = mtod(m, struct ether_header *);
  443         save_eh = *eh;                  /* save copy for restore below */
  444         m_adj(m, ETHER_HDR_LEN);        /* strip ethernet header */
  445 
  446         args.m = m;             /* the packet we are looking at         */
  447         args.oif = dst;         /* destination, if any                  */
  448         args.rule = *rule;      /* matching rule to restart             */
  449         args.next_hop = NULL;   /* we do not support forward yet        */
  450         args.eh = &save_eh;     /* MAC header for bridged/MAC packets   */
  451         args.inp = NULL;        /* used by ipfw uid/gid/jail rules      */
  452         i = ip_fw_chk_ptr(&args);
  453         m = args.m;
  454         if (m != NULL) {
  455                 /*
  456                  * Restore Ethernet header, as needed, in case the
  457                  * mbuf chain was replaced by ipfw.
  458                  */
  459                 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
  460                 if (m == NULL) {
  461                         *m0 = m;
  462                         return 0;
  463                 }
  464                 if (eh != mtod(m, struct ether_header *))
  465                         bcopy(&save_eh, mtod(m, struct ether_header *),
  466                                 ETHER_HDR_LEN);
  467         }
  468         *m0 = m;
  469         *rule = args.rule;
  470 
  471         if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */
  472                 return 0;
  473 
  474         if (i == 0) /* a PASS rule.  */
  475                 return 1;
  476 
  477         if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
  478                 /*
  479                  * Pass the pkt to dummynet, which consumes it.
  480                  * If shared, make a copy and keep the original.
  481                  */
  482                 if (shared) {
  483                         m = m_copypacket(m, M_DONTWAIT);
  484                         if (m == NULL)
  485                                 return 0;
  486                 } else {
  487                         /*
  488                          * Pass the original to dummynet and
  489                          * nothing back to the caller
  490                          */
  491                         *m0 = NULL ;
  492                 }
  493                 ip_dn_io_ptr(m, (i & 0xffff),
  494                         dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
  495                 return 0;
  496         }
  497         /*
  498          * XXX at some point add support for divert/forward actions.
  499          * If none of the above matches, we have to drop the pkt.
  500          */
  501         return 0;
  502 }
  503 #endif
  504 
  505 /*
  506  * Process a received Ethernet packet; the packet is in the
  507  * mbuf chain m with the ethernet header at the front.
  508  */
  509 static void
  510 ether_input(struct ifnet *ifp, struct mbuf *m)
  511 {
  512         struct ether_header *eh;
  513         u_short etype;
  514 
  515         /*
  516          * Do consistency checks to verify assumptions
  517          * made by code past this point.
  518          */
  519         if ((m->m_flags & M_PKTHDR) == 0) {
  520                 if_printf(ifp, "discard frame w/o packet header\n");
  521                 ifp->if_ierrors++;
  522                 m_freem(m);
  523                 return;
  524         }
  525         if (m->m_len < ETHER_HDR_LEN) {
  526                 /* XXX maybe should pullup? */
  527                 if_printf(ifp, "discard frame w/o leading ethernet "
  528                                 "header (len %u pkt len %u)\n",
  529                                 m->m_len, m->m_pkthdr.len);
  530                 ifp->if_ierrors++;
  531                 m_freem(m);
  532                 return;
  533         }
  534         eh = mtod(m, struct ether_header *);
  535         etype = ntohs(eh->ether_type);
  536         if (m->m_pkthdr.len >
  537             ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
  538                 if_printf(ifp, "discard oversize frame "
  539                                 "(ether type %x flags %x len %u > max %lu)\n",
  540                                 etype, m->m_flags, m->m_pkthdr.len,
  541                                 ETHER_MAX_FRAME(ifp, etype,
  542                                                 m->m_flags & M_HASFCS));
  543                 ifp->if_ierrors++;
  544                 m_freem(m);
  545                 return;
  546         }
  547         if (m->m_pkthdr.rcvif == NULL) {
  548                 if_printf(ifp, "discard frame w/o interface pointer\n");
  549                 ifp->if_ierrors++;
  550                 m_freem(m);
  551                 return;
  552         }
  553 #ifdef DIAGNOSTIC
  554         if (m->m_pkthdr.rcvif != ifp) {
  555                 if_printf(ifp, "Warning, frame marked as received on %s\n",
  556                         m->m_pkthdr.rcvif->if_xname);
  557         }
  558 #endif
  559 
  560 #ifdef MAC
  561         /*
  562          * Tag the mbuf with an appropriate MAC label before any other
  563          * consumers can get to it.
  564          */
  565         mac_create_mbuf_from_ifnet(ifp, m);
  566 #endif
  567 
  568         /*
  569          * Give bpf a chance at the packet.
  570          */
  571         BPF_MTAP(ifp, m);
  572 
  573         if (ifp->if_flags & IFF_MONITOR) {
  574                 /*
  575                  * Interface marked for monitoring; discard packet.
  576                  */
  577                 m_freem(m);
  578                 return;
  579         }
  580 
  581         /* If the CRC is still on the packet, trim it off. */
  582         if (m->m_flags & M_HASFCS) {
  583                 m_adj(m, -ETHER_CRC_LEN);
  584                 m->m_flags &= ~M_HASFCS;
  585         }
  586 
  587         ifp->if_ibytes += m->m_pkthdr.len;
  588 
  589         /* Handle ng_ether(4) processing, if any */
  590         if (ng_ether_input_p != NULL) {
  591                 (*ng_ether_input_p)(ifp, &m);
  592                 if (m == NULL)
  593                         return;
  594         }
  595 
  596         /*
  597         * Tap the packet off here for a bridge.  bridge_input()
  598         * will return NULL if it has consumed the packet, otherwise
  599         * it gets processed as normal.  Note that bridge_input()
  600         * will always return the original packet if we need to
  601         * process it locally.
  602         */
  603         if (ifp->if_bridge) {
  604                 BRIDGE_INPUT(ifp, m);
  605                 if (m == NULL)
  606                         return;
  607         }
  608 
  609         /* Check for bridging mode */
  610         if (BDG_ACTIVE(ifp) ) {
  611                 struct ifnet *bif;
  612 
  613                 /*
  614                  * Check with bridging code to see how the packet
  615                  * should be handled.  Possibilities are:
  616                  *
  617                  *    BDG_BCAST         broadcast
  618                  *    BDG_MCAST         multicast
  619                  *    BDG_LOCAL         for local address, don't forward
  620                  *    BDG_DROP          discard
  621                  *    ifp               forward only to specified interface(s)
  622                  *
  623                  * Non-local destinations are handled by passing the
  624                  * packet back to the bridge code.
  625                  */
  626                 bif = bridge_in_ptr(ifp, eh);
  627                 if (bif == BDG_DROP) {          /* discard packet */
  628                         m_freem(m);
  629                         return;
  630                 }
  631                 if (bif != BDG_LOCAL) {         /* non-local, forward */
  632                         m = bdg_forward_ptr(m, bif);
  633                         /*
  634                          * The bridge may consume the packet if it's not
  635                          * supposed to be passed up or if a problem occurred
  636                          * while doing its job.  This is reflected by it
  637                          * returning a NULL mbuf pointer.
  638                          */
  639                         if (m == NULL) {
  640                                 if (bif == BDG_BCAST || bif == BDG_MCAST)
  641                                         if_printf(ifp,
  642                                                 "bridge dropped %s packet\n",
  643                                                 bif == BDG_BCAST ? "broadcast" :
  644                                                                    "multicast");
  645                                 return;
  646                         }
  647                         /*
  648                          * But in some cases the bridge may return the
  649                          * packet for us to free; sigh.
  650                          */
  651                         if (bif != BDG_BCAST && bif != BDG_MCAST) {
  652                                 m_freem(m);
  653                                 return;
  654                         }
  655                 }
  656         }
  657 
  658         /* First chunk of an mbuf contains good entropy */
  659         if (harvest.ethernet)
  660                 random_harvest(m, 16, 3, 0, RANDOM_NET);
  661         ether_demux(ifp, m);
  662 }
  663 
  664 /*
  665  * Upper layer processing for a received Ethernet packet.
  666  */
  667 void
  668 ether_demux(struct ifnet *ifp, struct mbuf *m)
  669 {
  670         struct ether_header *eh;
  671         int isr;
  672         u_short ether_type;
  673 #if defined(NETATALK)
  674         struct llc *l;
  675 #endif
  676 #if defined(INET) || defined(INET6)
  677         struct ip_fw *rule = ip_dn_claim_rule(m);
  678 #endif
  679 
  680         KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer"));
  681 
  682         eh = mtod(m, struct ether_header *);
  683         ether_type = ntohs(eh->ether_type);
  684 
  685 #if defined(INET) || defined(INET6)
  686         if (rule)       /* packet was already bridged */
  687                 goto post_stats;
  688 #endif
  689 
  690         if (!(BDG_ACTIVE(ifp)) && !(ifp->if_bridge) &&
  691             !(ether_type == ETHERTYPE_VLAN && ifp->if_nvlans > 0)) {
  692 #ifdef DEV_CARP
  693                 /*
  694                  * XXX: Okay, we need to call carp_forus() and - if it is for
  695                  * us jump over code that does the normal check
  696                  * "ac_enaddr == ether_dhost". The check sequence is a bit
  697                  * different from OpenBSD, so we jump over as few code as
  698                  * possible, to catch _all_ sanity checks. This needs
  699                  * evaluation, to see if the carp ether_dhost values break any
  700                  * of these checks!
  701                  */
  702                 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
  703                         goto pre_stats;
  704 #endif
  705                 /*
  706                  * Discard packet if upper layers shouldn't see it because it
  707                  * was unicast to a different Ethernet address. If the driver
  708                  * is working properly, then this situation can only happen
  709                  * when the interface is in promiscuous mode.
  710                  *
  711                  * If VLANs are active, and this packet has a VLAN tag, do
  712                  * not drop it here but pass it on to the VLAN layer, to
  713                  * give them a chance to consider it as well (e. g. in case
  714                  * bridging is only active on a VLAN).  They will drop it if
  715                  * it's undesired.
  716                  */
  717                 if ((ifp->if_flags & IFF_PROMISC) != 0
  718                     && (eh->ether_dhost[0] & 1) == 0
  719                     && bcmp(eh->ether_dhost,
  720                       IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0
  721                     && (ifp->if_flags & IFF_PPROMISC) == 0) {
  722                             m_freem(m);
  723                             return;
  724                 }
  725         }
  726 
  727 #ifdef DEV_CARP
  728 pre_stats:
  729 #endif
  730         /* Discard packet if interface is not up */
  731         if ((ifp->if_flags & IFF_UP) == 0) {
  732                 m_freem(m);
  733                 return;
  734         }
  735         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  736                 if (bcmp(etherbroadcastaddr, eh->ether_dhost,
  737                     sizeof(etherbroadcastaddr)) == 0)
  738                         m->m_flags |= M_BCAST;
  739                 else
  740                         m->m_flags |= M_MCAST;
  741         }
  742         if (m->m_flags & (M_BCAST|M_MCAST))
  743                 ifp->if_imcasts++;
  744 
  745 #if defined(INET) || defined(INET6)
  746 post_stats:
  747         if (IPFW_LOADED && ether_ipfw != 0) {
  748                 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) {
  749                         if (m)
  750                                 m_freem(m);
  751                         return;
  752                 }
  753         }
  754 #endif
  755 
  756         /*
  757          * If VLANs are configured on the interface, check to
  758          * see if the device performed the decapsulation and
  759          * provided us with the tag.
  760          */
  761         if (ifp->if_nvlans &&
  762             m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) {
  763                 /*
  764                  * vlan_input() will either recursively call ether_input()
  765                  * or drop the packet.
  766                  */
  767                 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!"));
  768                 (*vlan_input_p)(ifp, m);
  769                 return;
  770         }
  771 
  772         /*
  773          * Handle protocols that expect to have the Ethernet header
  774          * (and possibly FCS) intact.
  775          */
  776         switch (ether_type) {
  777         case ETHERTYPE_VLAN:
  778                 if (ifp->if_nvlans != 0) {
  779                         KASSERT(vlan_input_p,("ether_input: VLAN not loaded!"));
  780                         (*vlan_input_p)(ifp, m);
  781                 } else {
  782                         ifp->if_noproto++;
  783                         m_freem(m);
  784                 }
  785                 return;
  786         }
  787 
  788         /* Strip off Ethernet header. */
  789         m_adj(m, ETHER_HDR_LEN);
  790 
  791         /* If the CRC is still on the packet, trim it off. */
  792         if (m->m_flags & M_HASFCS) {
  793                 m_adj(m, -ETHER_CRC_LEN);
  794                 m->m_flags &= ~M_HASFCS;
  795         }
  796 
  797         switch (ether_type) {
  798 #ifdef INET
  799         case ETHERTYPE_IP:
  800                 if (ip_fastforward(m))
  801                         return;
  802                 isr = NETISR_IP;
  803                 break;
  804 
  805         case ETHERTYPE_ARP:
  806                 if (ifp->if_flags & IFF_NOARP) {
  807                         /* Discard packet if ARP is disabled on interface */
  808                         m_freem(m);
  809                         return;
  810                 }
  811                 isr = NETISR_ARP;
  812                 break;
  813 #endif
  814 #ifdef IPX
  815         case ETHERTYPE_IPX:
  816                 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
  817                         return;
  818                 isr = NETISR_IPX;
  819                 break;
  820 #endif
  821 #ifdef INET6
  822         case ETHERTYPE_IPV6:
  823                 isr = NETISR_IPV6;
  824                 break;
  825 #endif
  826 #ifdef NETATALK
  827         case ETHERTYPE_AT:
  828                 isr = NETISR_ATALK1;
  829                 break;
  830         case ETHERTYPE_AARP:
  831                 isr = NETISR_AARP;
  832                 break;
  833 #endif /* NETATALK */
  834         default:
  835 #ifdef IPX
  836                 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
  837                         return;
  838 #endif /* IPX */
  839 #if defined(NETATALK)
  840                 if (ether_type > ETHERMTU)
  841                         goto discard;
  842                 l = mtod(m, struct llc *);
  843                 if (l->llc_dsap == LLC_SNAP_LSAP &&
  844                     l->llc_ssap == LLC_SNAP_LSAP &&
  845                     l->llc_control == LLC_UI) {
  846                         if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
  847                             sizeof(at_org_code)) == 0 &&
  848                             ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
  849                                 m_adj(m, LLC_SNAPFRAMELEN);
  850                                 isr = NETISR_ATALK2;
  851                                 break;
  852                         }
  853                         if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
  854                             sizeof(aarp_org_code)) == 0 &&
  855                             ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
  856                                 m_adj(m, LLC_SNAPFRAMELEN);
  857                                 isr = NETISR_AARP;
  858                                 break;
  859                         }
  860                 }
  861 #endif /* NETATALK */
  862                 goto discard;
  863         }
  864         netisr_dispatch(isr, m);
  865         return;
  866 
  867 discard:
  868         /*
  869          * Packet is to be discarded.  If netgraph is present,
  870          * hand the packet to it for last chance processing;
  871          * otherwise dispose of it.
  872          */
  873         if (ng_ether_input_orphan_p != NULL) {
  874                 /*
  875                  * Put back the ethernet header so netgraph has a
  876                  * consistent view of inbound packets.
  877                  */
  878                 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
  879                 (*ng_ether_input_orphan_p)(ifp, m);
  880                 return;
  881         }
  882         m_freem(m);
  883 }
  884 
  885 /*
  886  * Convert Ethernet address to printable (loggable) representation.
  887  * This routine is for compatibility; it's better to just use
  888  *
  889  *      printf("%6D", <pointer to address>, ":");
  890  *
  891  * since there's no static buffer involved.
  892  */
  893 char *
  894 ether_sprintf(const u_char *ap)
  895 {
  896         static char etherbuf[18];
  897         snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
  898         return (etherbuf);
  899 }
  900 
  901 /*
  902  * Perform common duties while attaching to interface list
  903  */
  904 void
  905 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc)
  906 {
  907         int i;
  908         struct ifaddr *ifa;
  909         struct sockaddr_dl *sdl;
  910 
  911         ifp->if_type = IFT_ETHER;
  912         ifp->if_addrlen = ETHER_ADDR_LEN;
  913         ifp->if_hdrlen = ETHER_HDR_LEN;
  914         if_attach(ifp);
  915         ifp->if_mtu = ETHERMTU;
  916         ifp->if_output = ether_output;
  917         ifp->if_input = ether_input;
  918         ifp->if_resolvemulti = ether_resolvemulti;
  919         if (ifp->if_baudrate == 0)
  920                 ifp->if_baudrate = IF_Mbps(10);         /* just a default */
  921         ifp->if_broadcastaddr = etherbroadcastaddr;
  922 
  923         ifa = ifaddr_byindex(ifp->if_index);
  924         KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
  925         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  926         sdl->sdl_type = IFT_ETHER;
  927         sdl->sdl_alen = ifp->if_addrlen;
  928         bcopy(llc, LLADDR(sdl), ifp->if_addrlen);
  929         /*
  930          * XXX: This doesn't belong here; we do it until
  931          * XXX:  all drivers are cleaned up
  932          */
  933         if (llc != IFP2AC(ifp)->ac_enaddr)
  934                 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
  935 
  936         bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
  937         if (ng_ether_attach_p != NULL)
  938                 (*ng_ether_attach_p)(ifp);
  939         if (BDG_LOADED)
  940                 bdgtakeifaces_ptr();
  941 
  942         /* Announce Ethernet MAC address if non-zero. */
  943         for (i = 0; i < ifp->if_addrlen; i++)
  944                 if (llc[i] != 0)
  945                         break; 
  946         if (i != ifp->if_addrlen)
  947                 if_printf(ifp, "Ethernet address: %6D\n", llc, ":");
  948         if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0)
  949                 if_printf(ifp, "if_start running deferred for Giant\n");
  950 }
  951 
  952 /*
  953  * Perform common duties while detaching an Ethernet interface
  954  */
  955 void
  956 ether_ifdetach(struct ifnet *ifp)
  957 {
  958         if (ng_ether_detach_p != NULL)
  959                 (*ng_ether_detach_p)(ifp);
  960 
  961         bpfdetach(ifp);
  962         if_detach(ifp);
  963         if (BDG_LOADED)
  964                 bdgtakeifaces_ptr();
  965 }
  966 
  967 SYSCTL_DECL(_net_link);
  968 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
  969 #if defined(INET) || defined(INET6)
  970 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
  971             &ether_ipfw,0,"Pass ether pkts through firewall");
  972 #endif
  973 
  974 #if 0
  975 /*
  976  * This is for reference.  We have a table-driven version
  977  * of the little-endian crc32 generator, which is faster
  978  * than the double-loop.
  979  */
  980 uint32_t
  981 ether_crc32_le(const uint8_t *buf, size_t len)
  982 {
  983         size_t i;
  984         uint32_t crc;
  985         int bit;
  986         uint8_t data;
  987 
  988         crc = 0xffffffff;       /* initial value */
  989 
  990         for (i = 0; i < len; i++) {
  991                 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1)
  992                         carry = (crc ^ data) & 1;
  993                         crc >>= 1;
  994                         if (carry)
  995                                 crc = (crc ^ ETHER_CRC_POLY_LE);
  996         }
  997 
  998         return (crc);
  999 }
 1000 #else
 1001 uint32_t
 1002 ether_crc32_le(const uint8_t *buf, size_t len)
 1003 {
 1004         static const uint32_t crctab[] = {
 1005                 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
 1006                 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
 1007                 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
 1008                 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
 1009         };
 1010         size_t i;
 1011         uint32_t crc;
 1012 
 1013         crc = 0xffffffff;       /* initial value */
 1014 
 1015         for (i = 0; i < len; i++) {
 1016                 crc ^= buf[i];
 1017                 crc = (crc >> 4) ^ crctab[crc & 0xf];
 1018                 crc = (crc >> 4) ^ crctab[crc & 0xf];
 1019         }
 1020 
 1021         return (crc);
 1022 }
 1023 #endif
 1024 
 1025 uint32_t
 1026 ether_crc32_be(const uint8_t *buf, size_t len)
 1027 {
 1028         size_t i;
 1029         uint32_t crc, carry;
 1030         int bit;
 1031         uint8_t data;
 1032 
 1033         crc = 0xffffffff;       /* initial value */
 1034 
 1035         for (i = 0; i < len; i++) {
 1036                 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
 1037                         carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
 1038                         crc <<= 1;
 1039                         if (carry)
 1040                                 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
 1041                 }
 1042         }
 1043 
 1044         return (crc);
 1045 }
 1046 
 1047 int
 1048 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
 1049 {
 1050         struct ifaddr *ifa = (struct ifaddr *) data;
 1051         struct ifreq *ifr = (struct ifreq *) data;
 1052         int error = 0;
 1053 
 1054         switch (command) {
 1055         case SIOCSIFADDR:
 1056                 ifp->if_flags |= IFF_UP;
 1057 
 1058                 switch (ifa->ifa_addr->sa_family) {
 1059 #ifdef INET
 1060                 case AF_INET:
 1061                         ifp->if_init(ifp->if_softc);    /* before arpwhohas */
 1062                         arp_ifinit(ifp, ifa);
 1063                         break;
 1064 #endif
 1065 #ifdef IPX
 1066                 /*
 1067                  * XXX - This code is probably wrong
 1068                  */
 1069                 case AF_IPX:
 1070                         {
 1071                         struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
 1072                         struct arpcom *ac = IFP2AC(ifp);
 1073 
 1074                         if (ipx_nullhost(*ina))
 1075                                 ina->x_host =
 1076                                     *(union ipx_host *)
 1077                                     ac->ac_enaddr;
 1078                         else {
 1079                                 bcopy((caddr_t) ina->x_host.c_host,
 1080                                       (caddr_t) ac->ac_enaddr,
 1081                                       sizeof(ac->ac_enaddr));
 1082                         }
 1083 
 1084                         /*
 1085                          * Set new address
 1086                          */
 1087                         ifp->if_init(ifp->if_softc);
 1088                         break;
 1089                         }
 1090 #endif
 1091                 default:
 1092                         ifp->if_init(ifp->if_softc);
 1093                         break;
 1094                 }
 1095                 break;
 1096 
 1097         case SIOCGIFADDR:
 1098                 {
 1099                         struct sockaddr *sa;
 1100 
 1101                         sa = (struct sockaddr *) & ifr->ifr_data;
 1102                         bcopy(IFP2AC(ifp)->ac_enaddr,
 1103                               (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
 1104                 }
 1105                 break;
 1106 
 1107         case SIOCSIFMTU:
 1108                 /*
 1109                  * Set the interface MTU.
 1110                  */
 1111                 if (ifr->ifr_mtu > ETHERMTU) {
 1112                         error = EINVAL;
 1113                 } else {
 1114                         ifp->if_mtu = ifr->ifr_mtu;
 1115                 }
 1116                 break;
 1117         default:
 1118                 error = EINVAL;                 /* XXX netbsd has ENOTTY??? */
 1119                 break;
 1120         }
 1121         return (error);
 1122 }
 1123 
 1124 static int
 1125 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
 1126         struct sockaddr *sa)
 1127 {
 1128         struct sockaddr_dl *sdl;
 1129 #ifdef INET
 1130         struct sockaddr_in *sin;
 1131 #endif
 1132 #ifdef INET6
 1133         struct sockaddr_in6 *sin6;
 1134 #endif
 1135         u_char *e_addr;
 1136 
 1137         switch(sa->sa_family) {
 1138         case AF_LINK:
 1139                 /*
 1140                  * No mapping needed. Just check that it's a valid MC address.
 1141                  */
 1142                 sdl = (struct sockaddr_dl *)sa;
 1143                 e_addr = LLADDR(sdl);
 1144                 if (!ETHER_IS_MULTICAST(e_addr))
 1145                         return EADDRNOTAVAIL;
 1146                 *llsa = 0;
 1147                 return 0;
 1148 
 1149 #ifdef INET
 1150         case AF_INET:
 1151                 sin = (struct sockaddr_in *)sa;
 1152                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 1153                         return EADDRNOTAVAIL;
 1154                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 1155                        M_NOWAIT|M_ZERO);
 1156                 if (sdl == NULL)
 1157                         return ENOMEM;
 1158                 sdl->sdl_len = sizeof *sdl;
 1159                 sdl->sdl_family = AF_LINK;
 1160                 sdl->sdl_index = ifp->if_index;
 1161                 sdl->sdl_type = IFT_ETHER;
 1162                 sdl->sdl_alen = ETHER_ADDR_LEN;
 1163                 e_addr = LLADDR(sdl);
 1164                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 1165                 *llsa = (struct sockaddr *)sdl;
 1166                 return 0;
 1167 #endif
 1168 #ifdef INET6
 1169         case AF_INET6:
 1170                 sin6 = (struct sockaddr_in6 *)sa;
 1171                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1172                         /*
 1173                          * An IP6 address of 0 means listen to all
 1174                          * of the Ethernet multicast address used for IP6.
 1175                          * (This is used for multicast routers.)
 1176                          */
 1177                         ifp->if_flags |= IFF_ALLMULTI;
 1178                         *llsa = 0;
 1179                         return 0;
 1180                 }
 1181                 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 1182                         return EADDRNOTAVAIL;
 1183                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 1184                        M_NOWAIT|M_ZERO);
 1185                 if (sdl == NULL)
 1186                         return (ENOMEM);
 1187                 sdl->sdl_len = sizeof *sdl;
 1188                 sdl->sdl_family = AF_LINK;
 1189                 sdl->sdl_index = ifp->if_index;
 1190                 sdl->sdl_type = IFT_ETHER;
 1191                 sdl->sdl_alen = ETHER_ADDR_LEN;
 1192                 e_addr = LLADDR(sdl);
 1193                 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
 1194                 *llsa = (struct sockaddr *)sdl;
 1195                 return 0;
 1196 #endif
 1197 
 1198         default:
 1199                 /*
 1200                  * Well, the text isn't quite right, but it's the name
 1201                  * that counts...
 1202                  */
 1203                 return EAFNOSUPPORT;
 1204         }
 1205 }
 1206 
 1207 static moduledata_t ether_mod = {
 1208         "ether",
 1209         NULL,
 1210         0
 1211 };
 1212 
 1213 DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 1214 MODULE_VERSION(ether, 1);

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