taglinefilesource code
ETH_P_IP1801drivers/net/ppp.creturn(htons(ETH_P_IP));
ETH_P_IP516drivers/net/slip.creturn htons(ETH_P_IP);
ETH_P_IP292net/inet/arp.carp->ar_pro = (dev->type != ARPHRD_AX25)? htons(ETH_P_IP) : htons(AX25_P_IP);
ETH_P_IP294net/inet/arp.carp->ar_pro = htons(ETH_P_IP);
ETH_P_IP517net/inet/arp.cif(arp->ar_pro != htons(ETH_P_IP))
ETH_P_IP142net/inet/eth.cif(eth->h_proto != htons(ETH_P_IP)) 
ETH_P_IP170net/inet/ip.cmac = dev->hard_header(skb->data, dev, ETH_P_IP, NULL, NULL, len, skb);
ETH_P_IP2029net/inet/ip.cip_packet_type.type=htons(ETH_P_IP);
ETH_P_IP203net/inet/rarp.c(rarp->ar_pro != htons(ETH_P_IP) && dev->type != ARPHRD_AX25)