taglinefilesource code
ip_hcache_ver178include/net/sock.hunsigned long     *ip_hcache_ver;    /* Pointer to version of cache    */
ip_hcache_ver229net/ethernet/eth.csk->ip_hcache_ver=&arp_cache_stamp;
ip_hcache_ver697net/ipv4/af_inet.csk->ip_hcache_ver= 0;
ip_hcache_ver2391net/ipv4/ip.csk->ip_hcache_ver=NULL;
ip_hcache_ver2404net/ipv4/ip.cif(sk->ip_hcache_ver==NULL || sk->ip_hcache_stamp!=*sk->ip_hcache_ver)