struct       sockaddr  hwaddr;               　　  //用来存储MAC地址的结构体

rtnl_lock();
ret =dev_close(jz_ndev);                          //首先需要关闭网卡,以防万一
rtnl_unlock();

hwaddr.sa_family = ndev->type; 

hwaddr.sa_data[0]=0x12;                      //注意,data[0]最低位不能为1,也就是首位不能为奇数
hwaddr.sa_data[1]=0x34;
hwaddr.sa_data[2]=0x56;
hwaddr.sa_data[3]=0x78;
hwaddr.sa_data[4]=0x90;
hwaddr.sa_data[5]=0xab;              

rtnl_lock();
ret = dev_set_mac_address(jz_ndev,&hwaddr);  //调用我们分析到的函数,来设置mac地址
rtnl_unlock();