/*接收的数据包含了netlink消息首部和自定义数据结构*/

struct u_packet_info

{

  struct nlmsghdr hdr;

  struct packet_info icmp_info;

};

struct u_packet_info info;

while(1)

{

    kpeerlen = sizeof(struct sockaddr_nl);

      /*接收内核空间返回的数据*/

      rcvlen = recvfrom(skfd, &info, sizeof(struct u_packet_info),

			0, (struct sockaddr*)&kpeer, &kpeerlen);

		  

       /*处理接收到的数据*/

……

}