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Linux netfilterÔ´Âë·ÖÎö(7)

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7.1 ipt_targetºÍipt_entry_target½á¹¹      ip_tables.h
ipt_targetºÍipt_match½á¹¹ÀàËÆ£º
struct ipt_target
{
      struct list_head list;
 
      const char name[IPT_FUNCTION_MAXNAMELEN];
 
/* ÔÚʹÓñ¾MatchµÄ¹æÔò×¢Èë±íÖÐ֮ǰµ÷Ó㬽øÐÐÓÐЧÐÔ¼ì²é£¬Èç¹û·µ»Ø0£¬¹æÔò¾Í²»»á¼ÓÈëiptablesÖÐ */
      int (*checkentry)(const char *tablename,
                   const struct ipt_entry *e,
                   void *targinfo,
                   unsigned int targinfosize,
                   unsigned int hook_mask);
 
/* ÔÚ°üº¬±¾TargetµÄ¹æÔò´Ó±íÖÐɾ³ýʱµ÷Óã¬ÓëcheckentryÅäºÏ¿ÉÓÃÓÚ¶¯Ì¬ÄÚ´æ·ÖÅäºÍÊÍ·Å */
      void (*destroy)(void *targinfo, unsigned int targinfosize);
 
/* targetµÄÄ£¿éº¯Êý£¬Èç¹ûÐèÒª¼ÌÐø´¦ÀíÔò·µ»ØIPT_CONTINUE£¨-1£©£¬·ñÔò·µ»ØNF_ACCEPT¡¢NF_DROPµÈÖµ£¬ËüµÄµ÷ÓÃÕ߸ù¾ÝËüµÄ·µ»ØÖµÀ´ÅжÏÈçºÎ´¦ÀíËü´¦Àí¹ýµÄ±¨ÎÄ*/
      unsigned int (*target)(struct sk_buff **pskb,
                        const struct net_device *in,
                        const struct net_device *out,
                        unsigned int hooknum,
        &n


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