arp_hrd
ah->arp_hrd = htons(ARPHRD_ETHER);
if (ah->arp_hrd != htons(ARPHRD_ETHER) ||
if (arp->arp_hrd != htons(ARPHRD_ETHER) ||
ap->arp_hrd = htons(ARPHRD_ETHER);
if (ap->arp_hrd != htons(ARPHRD_ETHER) ||
ntohs (ap->arp_hrd) != ARPHRD_ETHER ||