Linux netfilterÔ´Âë·ÖÎö(1)
תÌù×Ô:http://alexanderlaw.blog.hexun.com/8960896_d.html
Linux netfilterÔ´Âë·ÖÎö(1)
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Ò»¡¢ IP±¨ÎĵĽÓÊÕµ½hookº¯ÊýµÄµ÷ÓÃ
1.1 ip_input.c ip_rcv()º¯Êý
ÒÔ½ÓÊÕµ½µÄ±¨ÎÄΪÀý£¬ÀàËÆµÄ»¹ÓÐip_forward(ip_forward.c)ºÍip_output(ip_output.c)
int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
struct iphdr *iph; //¶¨ÒåÒ»¸öip±¨ÎĵÄÊý¾Ý±¨Í·
u32 len;
if (skb->pkt_type == PACKET_OTHERHOST)
goto drop; //Êý¾Ý°ü²»ÊÇ·¢¸øÎÒÃǵÄ
IP_INC_STATS_BH(IPSTATS_MIB_INRECEIVES); //ÊÕµ½Êý¾Ý°üͳ¼ÆÁ¿¼Ó1
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
{
/* Èç¹ûÊý¾Ý±¨Êǹ²ÏíµÄ£¬Ôò¸´ÖÆÒ»¸ö³öÀ´£¬´Ëʱ¸´Öƶø³öµÄÒѾºÍsocketÍÑÀëÁ˹ØÏµ */
IP_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
goto out;
}
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto inhdr_error; //¶ÔÊý¾Ý±¨µÄÍ·³¤¶È½øÐмì²é£¬
iph = skb->nh.iph; //È¡µÃÊý¾Ý±¨µÄÍ·²¿Î»ÖÃ
if (iph->ihl < 5 || iph->version != 4) //°æ±¾ºÅ»òÕßÍ·³¤¶È²»¶Ô£¬
goto inhdr_error; //Í·³¤¶ÈÊÇÒÔ4×Ö½ÚΪµ¥Î»µÄ£¬ËùÒÔ5±íʾµÄÊÇ20×Ö½Ú
if (!pskb_may_pull(skb, iph->ihl*4))
goto inhdr_error;
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
goto inhdr_error; //¼ì²é±¨ÎĵļìÑéºÍ×Ö¶Î
len = ntohs(iph->tot_len);
if (skb->len < len || len < (iph->ihl*4))
goto inhdr_error; //Õû¸ö±¨Îij¤¶È²»¿ÉÄܱȱ¨Í·³¤¶ÈС
if (pskb_tr
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http://hi.baidu.com/hust_chen/blog/item/54a8c516231d0c0ec93d6d3e.html
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