134   struct arphdr *arp_hdr = (struct arphdr *)toybuf;  in recv_from()  local
135   unsigned char *p = (unsigned char *)(arp_hdr + 1);  in recv_from()
137   if (arp_hdr->ar_op != htons(ARPOP_REQUEST) &&   in recv_from()
138       arp_hdr->ar_op != htons(ARPOP_REPLY)) return;   in recv_from()
143   if (arp_hdr->ar_pro != htons(ETH_P_IP) || (arp_hdr->ar_pln != 4)   in recv_from()
144       || (arp_hdr->ar_hln != src_pk.sll_halen)   in recv_from()
145       || (*recv_len < (int)(sizeof(*arp_hdr) + 2 * (4 + arp_hdr->ar_hln))))  in recv_from()
148   memcpy(&s_ip.s_addr, p + arp_hdr->ar_hln, 4);  in recv_from()
149   memcpy(&d_ip.s_addr, p + arp_hdr->ar_hln + 4 + arp_hdr->ar_hln, 4);   in recv_from()
160         arp_hdr->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest",  in recv_from()
174   if (arp_hdr->ar_op == htons(ARPOP_REQUEST)) TT.rcvd_req++;  in recv_from()