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2008-07-07 22:06
PREROUTING£ºip_conntrack_defrag à ip_conntrack_in
1£¬ip_conntrack_defrag:
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/* Èô±¨ÎÄ·ÖÆ¬£¬Ôò µ÷ÓÃip_ct_gather_frags ×é×°±¨ÎÄ£¬Èç¹ûËùÓÐ·ÖÆ¬¾ùÒѵ½´ï£¬pskbÖ¸ÏòÐÂÉú³ÉµÄ±¨ÎÄ£¬¼ÌÐøÑØ×ÅHOOKÁ´½øÐÐÏÂÒ»²½´¦Àí£»·ñÔòΪ¿Õ£¬±¨Îı»»º´æµÈ´ýÏÂÒ»·ÖƬµ½À´*/
if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
     *pskb = ip_ct_gather_frags(*pskb,
                                hooknum == NF_IP_PRE_ROUTING ?
                      IP_DEFRAG_CONNTRACK_IN :
                      IP_DEFRAG_CONNTRACK_OUT);
     if (!*pskb)
          return NF_STOLEN;
}
return NF_ACCEPT;
ip_ct_gather_fragsÖ±½Óµ÷ÓÃip_defrag´¦ÀíIP·ÖƬ±¨ÎÄ¡£¶ÔÓÚ·ÖÆ¬±¨ÎĵÄÖØ×éÖ÷ÒªÔÚip_fragment.cÖÐÍê³É¡£
 
3, resolve_normal_ct£º
   resolve_normal_ctÔÚÈ«¾ÖÁ¬½Ó±íÖУ¬²éÕÒÓë¸Ã±¨ÎÄÏàÓ¦µÄÁ¬½Ó״̬£¬·µ»ØµÄÊÇip_conntrackµÄÖ¸Õ룬ÓÃÓÚÃèÊöºÍ¼Ç¼Á¬½ÓµÄ״̬£»Èô¸ÃÁ¬½ÓÉв»´æÔÚ£¬Ôò´´½¨ÏàÓ¦µÄ½á¹¹£¬²¢½øÐгõʼ»¯£¬ÉèÖÃÁ¬½Ó״̬¡£
   /*1,½«Êý¾Ý°üµÄÄÚÈÝת»¯³ÉÏàÓ¦µÄtuple£¬¶ÔÓÚºÍЭÒéÏà¹ØµÄ²¿·Ö£¬Èç¶Ë¿Ú£¬Ôòµ÷ÓÃÏà¹ØÐ­ÒéµÄ´¦Àíº¯Êýpkt_to_tuple*/
      if (!ip_ct_get_tuple(skb->nh.iph, skb, skb->nh.iph->ihl*4,
         


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2.    ÅäÖð²×°gdb+gdbser
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$ cd x/gdb
$ ./configure --target=arm-linux --prefix ......

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