root/net/ipv4/ip_input.c

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DEFINITIONS

This source file includes following definitions.
  1. ip_ioctl
  2. ip_rcv

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              The Internet Protocol (IP) module.
   7  *
   8  * Version:     @(#)ip.c        1.0.16b 9/1/93
   9  *
  10  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Donald Becker, <becker@super.org>
  13  *              Alan Cox, <Alan.Cox@linux.org>
  14  *              Richard Underwood
  15  *              Stefan Becker, <stefanb@yello.ping.de>
  16  *              Jorge Cwik, <jorge@laser.satlink.net>
  17  *              Arnt Gulbrandsen, <agulbra@nvg.unit.no>
  18  *              
  19  *
  20  * Fixes:
  21  *              Alan Cox        :       Commented a couple of minor bits of surplus code
  22  *              Alan Cox        :       Undefining IP_FORWARD doesn't include the code
  23  *                                      (just stops a compiler warning).
  24  *              Alan Cox        :       Frames with >=MAX_ROUTE record routes, strict routes or loose routes
  25  *                                      are junked rather than corrupting things.
  26  *              Alan Cox        :       Frames to bad broadcast subnets are dumped
  27  *                                      We used to process them non broadcast and
  28  *                                      boy could that cause havoc.
  29  *              Alan Cox        :       ip_forward sets the free flag on the
  30  *                                      new frame it queues. Still crap because
  31  *                                      it copies the frame but at least it
  32  *                                      doesn't eat memory too.
  33  *              Alan Cox        :       Generic queue code and memory fixes.
  34  *              Fred Van Kempen :       IP fragment support (borrowed from NET2E)
  35  *              Gerhard Koerting:       Forward fragmented frames correctly.
  36  *              Gerhard Koerting:       Fixes to my fix of the above 8-).
  37  *              Gerhard Koerting:       IP interface addressing fix.
  38  *              Linus Torvalds  :       More robustness checks
  39  *              Alan Cox        :       Even more checks: Still not as robust as it ought to be
  40  *              Alan Cox        :       Save IP header pointer for later
  41  *              Alan Cox        :       ip option setting
  42  *              Alan Cox        :       Use ip_tos/ip_ttl settings
  43  *              Alan Cox        :       Fragmentation bogosity removed
  44  *                                      (Thanks to Mark.Bush@prg.ox.ac.uk)
  45  *              Dmitry Gorodchanin :    Send of a raw packet crash fix.
  46  *              Alan Cox        :       Silly ip bug when an overlength
  47  *                                      fragment turns up. Now frees the
  48  *                                      queue.
  49  *              Linus Torvalds/ :       Memory leakage on fragmentation
  50  *              Alan Cox        :       handling.
  51  *              Gerhard Koerting:       Forwarding uses IP priority hints
  52  *              Teemu Rantanen  :       Fragment problems.
  53  *              Alan Cox        :       General cleanup, comments and reformat
  54  *              Alan Cox        :       SNMP statistics
  55  *              Alan Cox        :       BSD address rule semantics. Also see
  56  *                                      UDP as there is a nasty checksum issue
  57  *                                      if you do things the wrong way.
  58  *              Alan Cox        :       Always defrag, moved IP_FORWARD to the config.in file
  59  *              Alan Cox        :       IP options adjust sk->priority.
  60  *              Pedro Roque     :       Fix mtu/length error in ip_forward.
  61  *              Alan Cox        :       Avoid ip_chk_addr when possible.
  62  *      Richard Underwood       :       IP multicasting.
  63  *              Alan Cox        :       Cleaned up multicast handlers.
  64  *              Alan Cox        :       RAW sockets demultiplex in the BSD style.
  65  *              Gunther Mayer   :       Fix the SNMP reporting typo
  66  *              Alan Cox        :       Always in group 224.0.0.1
  67  *      Pauline Middelink       :       Fast ip_checksum update when forwarding
  68  *                                      Masquerading support.
  69  *              Alan Cox        :       Multicast loopback error for 224.0.0.1
  70  *              Alan Cox        :       IP_MULTICAST_LOOP option.
  71  *              Alan Cox        :       Use notifiers.
  72  *              Bjorn Ekwall    :       Removed ip_csum (from slhc.c too)
  73  *              Bjorn Ekwall    :       Moved ip_fast_csum to ip.h (inline!)
  74  *              Stefan Becker   :       Send out ICMP HOST REDIRECT
  75  *      Arnt Gulbrandsen        :       ip_build_xmit
  76  *              Alan Cox        :       Per socket routing cache
  77  *              Alan Cox        :       Fixed routing cache, added header cache.
  78  *              Alan Cox        :       Loopback didnt work right in original ip_build_xmit - fixed it.
  79  *              Alan Cox        :       Only send ICMP_REDIRECT if src/dest are the same net.
  80  *              Alan Cox        :       Incoming IP option handling.
  81  *              Alan Cox        :       Set saddr on raw output frames as per BSD.
  82  *              Alan Cox        :       Stopped broadcast source route explosions.
  83  *              Alan Cox        :       Can disable source routing
  84  *              Takeshi Sone    :       Masquerading didn't work.
  85  *      Dave Bonn,Alan Cox      :       Faster IP forwarding whenever possible.
  86  *              Alan Cox        :       Memory leaks, tramples, misc debugging.
  87  *              Alan Cox        :       Fixed multicast (by popular demand 8))
  88  *              Alan Cox        :       Fixed forwarding (by even more popular demand 8))
  89  *              Alan Cox        :       Fixed SNMP statistics [I think]
  90  *      Gerhard Koerting        :       IP fragmentation forwarding fix
  91  *              Alan Cox        :       Device lock against page fault.
  92  *              Alan Cox        :       IP_HDRINCL facility.
  93  *      Werner Almesberger      :       Zero fragment bug
  94  *              Alan Cox        :       RAW IP frame length bug
  95  *              Alan Cox        :       Outgoing firewall on build_xmit
  96  *              A.N.Kuznetsov   :       IP_OPTIONS support throughout the kernel
  97  *              Alan Cox        :       Multicast routing hooks
  98  *
  99  *  
 100  *
 101  * To Fix:
 102  *              IP fragmentation wants rewriting cleanly. The RFC815 algorithm is much more efficient
 103  *              and could be made very efficient with the addition of some virtual memory hacks to permit
 104  *              the allocation of a buffer that can then be 'grown' by twiddling page tables.
 105  *              Output fragmentation wants updating along with the buffer management to use a single 
 106  *              interleaved copy algorithm so that fragmenting has a one copy overhead. Actual packet
 107  *              output should probably do its own fragmentation at the UDP/RAW layer. TCP shouldn't cause
 108  *              fragmentation anyway.
 109  *
 110  *              FIXME: copy frag 0 iph to qp->iph
 111  *
 112  *              This program is free software; you can redistribute it and/or
 113  *              modify it under the terms of the GNU General Public License
 114  *              as published by the Free Software Foundation; either version
 115  *              2 of the License, or (at your option) any later version.
 116  */
 117 
 118 #include <asm/segment.h>
 119 #include <asm/system.h>
 120 #include <linux/types.h>
 121 #include <linux/kernel.h>
 122 #include <linux/sched.h>
 123 #include <linux/mm.h>
 124 #include <linux/string.h>
 125 #include <linux/errno.h>
 126 #include <linux/config.h>
 127 
 128 #include <linux/socket.h>
 129 #include <linux/sockios.h>
 130 #include <linux/in.h>
 131 #include <linux/inet.h>
 132 #include <linux/netdevice.h>
 133 #include <linux/etherdevice.h>
 134 #include <linux/proc_fs.h>
 135 #include <linux/stat.h>
 136 
 137 #include <net/snmp.h>
 138 #include <net/ip.h>
 139 #include <net/protocol.h>
 140 #include <net/route.h>
 141 #include <net/tcp.h>
 142 #include <net/udp.h>
 143 #include <linux/skbuff.h>
 144 #include <net/sock.h>
 145 #include <net/arp.h>
 146 #include <net/icmp.h>
 147 #include <net/raw.h>
 148 #include <net/checksum.h>
 149 #include <linux/igmp.h>
 150 #include <linux/ip_fw.h>
 151 #include <linux/firewall.h>
 152 #include <linux/mroute.h>
 153 #include <net/netlink.h>
 154 
 155 extern int last_retran;
 156 extern void sort_send(struct sock *sk);
 157 
 158 #define min(a,b)        ((a)<(b)?(a):(b))
 159 
 160 /*
 161  *      SNMP management statistics
 162  */
 163 
 164 #ifdef CONFIG_IP_FORWARD
 165 struct ip_mib ip_statistics={1,64,};    /* Forwarding=Yes, Default TTL=64 */
 166 #else
 167 struct ip_mib ip_statistics={2,64,};    /* Forwarding=No, Default TTL=64 */
 168 #endif
 169 
 170 /*
 171  *      Handle the issuing of an ioctl() request
 172  *      for the ip device. This is scheduled to
 173  *      disappear
 174  */
 175 
 176 int ip_ioctl(struct sock *sk, int cmd, unsigned long arg)
     /* [previous][next][first][last][top][bottom][index][help] */
 177 {
 178         switch(cmd)
 179         {
 180                 default:
 181                         return(-EINVAL);
 182         }
 183 }
 184 
 185 
 186 
 187 /*
 188  *      This function receives all incoming IP datagrams.
 189  *
 190  *      On entry skb->data points to the start of the IP header and
 191  *      the MAC header has been removed.
 192  */
 193 
 194 int ip_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
     /* [previous][next][first][last][top][bottom][index][help] */
 195 {
 196         struct iphdr *iph = skb->h.iph;
 197         struct sock *raw_sk=NULL;
 198         unsigned char hash;
 199         unsigned char flag = 0;
 200         struct inet_protocol *ipprot;
 201         int brd=IS_MYADDR;
 202         struct options * opt = NULL;
 203         int is_frag=0;
 204 #ifdef CONFIG_FIREWALL
 205         int err;
 206 #endif  
 207 #ifdef CONFIG_IP_MROUTE
 208         int mroute_pkt=0;
 209 #endif  
 210 
 211 #ifdef CONFIG_NET_IPV6
 212         /* 
 213          *      Intercept IPv6 frames. We dump ST-II and invalid types just below..
 214          */
 215          
 216         if(iph->version == 6)
 217                 return ipv6_rcv(skb,dev,pt);
 218 #endif          
 219 
 220         ip_statistics.IpInReceives++;
 221 
 222         /*
 223          *      Tag the ip header of this packet so we can find it
 224          */
 225 
 226         skb->ip_hdr = iph;
 227 
 228         /*
 229          *      RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the checksum.
 230          *      RFC1122: 3.1.2.3 MUST discard a frame with invalid source address [NEEDS FIXING].
 231          *
 232          *      Is the datagram acceptable?
 233          *
 234          *      1.      Length at least the size of an ip header
 235          *      2.      Version of 4
 236          *      3.      Checksums correctly. [Speed optimisation for later, skip loopback checksums]
 237          *      4.      Doesn't have a bogus length
 238          *      (5.     We ought to check for IP multicast addresses and undefined types.. does this matter ?)
 239          */
 240 
 241         if (skb->len<sizeof(struct iphdr) || iph->ihl<5 || iph->version != 4 || ip_fast_csum((unsigned char *)iph, iph->ihl) !=0
 242                 || skb->len < ntohs(iph->tot_len))
 243         {
 244                 ip_statistics.IpInHdrErrors++;
 245                 kfree_skb(skb, FREE_WRITE);
 246                 return(0);
 247         }
 248 
 249         /*
 250          *      Our transport medium may have padded the buffer out. Now we know it
 251          *      is IP we can trim to the true length of the frame.
 252          *      Note this now means skb->len holds ntohs(iph->tot_len).
 253          */
 254 
 255         skb_trim(skb,ntohs(iph->tot_len));
 256 
 257         if (iph->ihl > 5) 
 258         {
 259                 skb->ip_summed = 0;
 260                 if (ip_options_compile(NULL, skb))
 261                         return(0);
 262                 opt = (struct options*)skb->proto_priv;
 263 #ifdef CONFIG_IP_NOSR
 264                 if (opt->srr) 
 265                 {
 266                         kfree_skb(skb, FREE_READ);
 267                         return -EINVAL;
 268                 }
 269 #endif                                  
 270         }
 271         
 272         /*
 273          *      See if the firewall wants to dispose of the packet. 
 274          */
 275 
 276 #ifdef  CONFIG_FIREWALL
 277         
 278         if ((err=call_in_firewall(PF_INET, skb, iph))<FW_ACCEPT)
 279         {
 280                 if(err==FW_REJECT)
 281                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0, dev);
 282                 kfree_skb(skb, FREE_WRITE);
 283                 return 0;       
 284         }
 285 
 286 #endif
 287         
 288         /*
 289          *      Remember if the frame is fragmented.
 290          */
 291          
 292         if(iph->frag_off)
 293         {
 294                 if (iph->frag_off & htons(IP_MF))
 295                         is_frag|=1;
 296                 /*
 297                  *      Last fragment ?
 298                  */
 299         
 300                 if (iph->frag_off & htons(IP_OFFSET))
 301                         is_frag|=2;
 302         }
 303         
 304         /*
 305          *      Do any IP forwarding required.  chk_addr() is expensive -- avoid it someday.
 306          *
 307          *      This is inefficient. While finding out if it is for us we could also compute
 308          *      the routing table entry. This is where the great unified cache theory comes
 309          *      in as and when someone implements it
 310          *
 311          *      For most hosts over 99% of packets match the first conditional
 312          *      and don't go via ip_chk_addr. Note: brd is set to IS_MYADDR at
 313          *      function entry.
 314          */
 315 
 316         if ( iph->daddr == skb->dev->pa_addr || (brd = ip_chk_addr(iph->daddr)) != 0)
 317         {
 318                 if (opt && opt->srr) 
 319                 {
 320                         int srrspace, srrptr;
 321                         __u32 nexthop;
 322                         unsigned char * optptr = ((unsigned char *)iph) + opt->srr;
 323 
 324                         if (brd != IS_MYADDR || skb->pkt_type != PACKET_HOST) 
 325                         {
 326                                 kfree_skb(skb, FREE_WRITE);
 327                                 return 0;
 328                         }
 329 
 330                         for ( srrptr=optptr[2], srrspace = optptr[1];
 331                               srrptr <= srrspace;
 332                               srrptr += 4
 333                              ) 
 334                         {
 335                                 int brd2;
 336                                 if (srrptr + 3 > srrspace) 
 337                                 {
 338                                         icmp_send(skb, ICMP_PARAMETERPROB, 0, opt->srr+2,
 339                                                   skb->dev);
 340                                         kfree_skb(skb, FREE_WRITE);
 341                                         return 0;
 342                                 }
 343                                 memcpy(&nexthop, &optptr[srrptr-1], 4);
 344                                 if ((brd2 = ip_chk_addr(nexthop)) == 0)
 345                                         break;
 346                                 if (brd2 != IS_MYADDR) 
 347                                 {
 348 
 349                                         /*
 350                                          *      ANK: should we implement weak tunneling of multicasts?
 351                                          *      Are they obsolete? DVMRP specs (RFC-1075) is old enough...
 352                                          *      [They are obsolete]
 353                                          */
 354                                         kfree_skb(skb, FREE_WRITE);
 355                                         return -EINVAL;
 356                                 }
 357                         }
 358                         if (srrptr <= srrspace) 
 359                         {
 360                                 opt->srr_is_hit = 1;
 361                                 opt->is_changed = 1;
 362 #ifdef CONFIG_IP_FORWARD
 363                                 if (ip_forward(skb, dev, is_frag, nexthop))
 364                                         kfree_skb(skb, FREE_WRITE);
 365 #else
 366                                 ip_statistics.IpInAddrErrors++;
 367                                 kfree_skb(skb, FREE_WRITE);
 368 #endif
 369                                 return 0;
 370                         }
 371                 }
 372 
 373 #ifdef CONFIG_IP_MULTICAST      
 374                 if(!(dev->flags&IFF_ALLMULTI) && brd==IS_MULTICAST && iph->daddr!=IGMP_ALL_HOSTS && !(dev->flags&IFF_LOOPBACK))
 375                 {
 376                         /*
 377                          *      Check it is for one of our groups
 378                          */
 379                         struct ip_mc_list *ip_mc=dev->ip_mc_list;
 380                         do
 381                         {
 382                                 if(ip_mc==NULL)
 383                                 {       
 384                                         kfree_skb(skb, FREE_WRITE);
 385                                         return 0;
 386                                 }
 387                                 if(ip_mc->multiaddr==iph->daddr)
 388                                         break;
 389                                 ip_mc=ip_mc->next;
 390                         }
 391                         while(1);
 392                 }
 393 #endif
 394 
 395 #ifdef CONFIG_IP_MASQUERADE
 396                 /*
 397                  * Do we need to de-masquerade this fragment?
 398                  */
 399                 if (ip_fw_demasquerade(skb)) 
 400                 {
 401                         struct iphdr *iph=skb->h.iph;
 402                         if (ip_forward(skb, dev, is_frag|4, iph->daddr))
 403                                 kfree_skb(skb, FREE_WRITE);
 404                         return(0);
 405                 }
 406 #endif
 407 
 408                 /*
 409                  *      Account for the packet
 410                  */
 411  
 412 #ifdef CONFIG_IP_ACCT
 413                 ip_fw_chk(iph,dev,ip_acct_chain,IP_FW_F_ACCEPT,1);
 414 #endif  
 415 
 416                 /*
 417                  *      Reassemble IP fragments.
 418                  */
 419 
 420                 if(is_frag)
 421                 {
 422                         /* Defragment. Obtain the complete packet if there is one */
 423                         skb=ip_defrag(iph,skb,dev);
 424                         if(skb==NULL)
 425                                 return 0;
 426                         skb->dev = dev;
 427                         iph=skb->h.iph;
 428                 }
 429 
 430                 /*
 431                  *      Point into the IP datagram, just past the header.
 432                  */
 433 
 434                 skb->ip_hdr = iph;
 435                 skb->h.raw += iph->ihl*4;
 436 
 437 #ifdef CONFIG_IP_MROUTE         
 438                 /*
 439                  *      Check the state on multicast routing (multicast and not 224.0.0.z)
 440                  */
 441                  
 442                 if(brd==IS_MULTICAST && (iph->daddr&htonl(0xFFFFFF00))!=htonl(0xE0000000))
 443                         mroute_pkt=1;
 444 
 445 #endif
 446                 /*
 447                  *      Deliver to raw sockets. This is fun as to avoid copies we want to make no surplus copies.
 448                  *
 449                  *      RFC 1122: SHOULD pass TOS value up to the transport layer.
 450                  */
 451  
 452                 hash = iph->protocol & (SOCK_ARRAY_SIZE-1);
 453 
 454                 /* 
 455                  *      If there maybe a raw socket we must check - if not we don't care less 
 456                  */
 457                  
 458                 if((raw_sk=raw_prot.sock_array[hash])!=NULL)
 459                 {
 460                         struct sock *sknext=NULL;
 461                         struct sk_buff *skb1;
 462                         raw_sk=get_sock_raw(raw_sk, iph->protocol,  iph->saddr, iph->daddr);
 463                         if(raw_sk)      /* Any raw sockets */
 464                         {
 465                                 do
 466                                 {
 467                                         /* Find the next */
 468                                         sknext=get_sock_raw(raw_sk->next, iph->protocol, iph->saddr, iph->daddr);
 469                                         if(sknext)
 470                                                 skb1=skb_clone(skb, GFP_ATOMIC);
 471                                         else
 472                                                 break;  /* One pending raw socket left */
 473                                         if(skb1)
 474                                                 raw_rcv(raw_sk, skb1, dev, iph->saddr,iph->daddr);
 475                                         raw_sk=sknext;
 476                                 }
 477                                 while(raw_sk!=NULL);
 478                                 
 479                                 /*
 480                                  *      Here either raw_sk is the last raw socket, or NULL if none 
 481                                  */
 482                                  
 483                                 /*
 484                                  *      We deliver to the last raw socket AFTER the protocol checks as it avoids a surplus copy 
 485                                  */
 486                         }
 487                 }
 488         
 489                 /*
 490                  *      skb->h.raw now points at the protocol beyond the IP header.
 491                  */
 492         
 493                 hash = iph->protocol & (MAX_INET_PROTOS -1);
 494                 for (ipprot = (struct inet_protocol *)inet_protos[hash];ipprot != NULL;ipprot=(struct inet_protocol *)ipprot->next)
 495                 {
 496                         struct sk_buff *skb2;
 497         
 498                         if (ipprot->protocol != iph->protocol)
 499                                 continue;
 500                        /*
 501                         *       See if we need to make a copy of it.  This will
 502                         *       only be set if more than one protocol wants it.
 503                         *       and then not for the last one. If there is a pending
 504                         *       raw delivery wait for that
 505                         */
 506         
 507 #ifdef CONFIG_IP_MROUTE
 508                         if (ipprot->copy || raw_sk || mroute_pkt)
 509 #else   
 510                         if (ipprot->copy || raw_sk)
 511 #endif                  
 512                         {
 513                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 514                                 if(skb2==NULL)
 515                                         continue;
 516                         }
 517                         else
 518                         {
 519                                 skb2 = skb;
 520                         }
 521                         flag = 1;
 522 
 523                        /*
 524                         *       Pass on the datagram to each protocol that wants it,
 525                         *       based on the datagram protocol.  We should really
 526                         *       check the protocol handler's return values here...
 527                         */
 528 
 529                         ipprot->handler(skb2, dev, opt, iph->daddr,
 530                                 (ntohs(iph->tot_len) - (iph->ihl * 4)),
 531                                 iph->saddr, 0, ipprot);
 532                 }
 533 
 534                 /*
 535                  *      All protocols checked.
 536                  *      If this packet was a broadcast, we may *not* reply to it, since that
 537                  *      causes (proven, grin) ARP storms and a leakage of memory (i.e. all
 538                  *      ICMP reply messages get queued up for transmission...)
 539                  */
 540 
 541 #ifdef CONFIG_IP_MROUTE          
 542                 /*
 543                  *      Forward the last copy to the multicast router. If
 544                  *      there is a pending raw deliery however make a copy
 545                  *      and forward that.
 546                  */
 547                  
 548                 if(mroute_pkt)
 549                 {
 550                         flag=1;
 551                         if(raw_sk==NULL)
 552                                 ipmr_forward(skb, is_frag);
 553                         else
 554                         {
 555                                 struct sk_buff *skb2=skb_clone(skb, GFP_ATOMIC);
 556                                 if(skb2)
 557                                 {
 558                                         skb2->free=1;
 559                                         ipmr_forward(skb2, is_frag);
 560                                 }
 561                         }
 562                 }
 563 #endif          
 564 
 565                 if(raw_sk!=NULL)        /* Shift to last raw user */
 566                         raw_rcv(raw_sk, skb, dev, iph->saddr, iph->daddr);
 567                 else if (!flag)         /* Free and report errors */
 568                 {
 569                         if (brd != IS_BROADCAST && brd!=IS_MULTICAST)
 570                                 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0, dev);   
 571                         kfree_skb(skb, FREE_WRITE);
 572                 }
 573 
 574                 return(0);
 575         }
 576 
 577         /*
 578          *      Do any unicast IP forwarding required.
 579          */
 580         
 581         /*
 582          *      Don't forward multicast or broadcast frames.
 583          */
 584 
 585         if(skb->pkt_type!=PACKET_HOST || brd==IS_BROADCAST)
 586         {
 587                 kfree_skb(skb,FREE_WRITE);
 588                 return 0;
 589         }
 590 
 591         /*
 592          *      The packet is for another target. Forward the frame
 593          */
 594 
 595 #ifdef CONFIG_IP_FORWARD
 596         if (opt && opt->is_strictroute) 
 597         {
 598               icmp_send(skb, ICMP_PARAMETERPROB, 0, 16, skb->dev);
 599               kfree_skb(skb, FREE_WRITE);
 600               return -1;
 601         }
 602         if (ip_forward(skb, dev, is_frag, iph->daddr))
 603                 kfree_skb(skb, FREE_WRITE);
 604 #else
 605 /*      printk("Machine %lx tried to use us as a forwarder to %lx but we have forwarding disabled!\n",
 606                         iph->saddr,iph->daddr);*/
 607         ip_statistics.IpInAddrErrors++;
 608         kfree_skb(skb, FREE_WRITE);
 609 #endif
 610         return(0);
 611 }
 612         
 613 

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