taglinefilesource code
ip_dev_find222include/linux/netdevice.hextern struct device   *ip_dev_find(unsigned long addr);
ip_dev_find444net/ipv4/igmp.cdev=ip_dev_find(saddr);
ip_dev_find476net/ipv4/ipmr.cdev=ip_dev_find(vif.vifc_lcl_addr.s_addr);