arp_pro
ah->arp_pro = htons(ETHERTYPE_IP);
ah->arp_pro != htons(ETHERTYPE_IP) ||
arp->arp_pro != htons(ETHERTYPE_IP) ||
ap->arp_pro != htons(ETHERTYPE_IP) ||
ap->arp_pro = htons(ETHERTYPE_IP);
ntohs(ea.arp_pro) != ETHERTYPE_IP ||
ea.arp_pro != htons(ETHERTYPE_IP) ||
ea->arp_pro = htons(ETHERTYPE_IP);
ea->arp_pro = htons(ETHERTYPE_IP); /* let's be sure! */
ea->arp_pro = htons(ETHERTYPE_IP);
ntohs (ap->arp_pro) != ETHERTYPE_IP ||
pro = EXTRACT_16BITS(&ap->arp_pro);