net/ipv4/arp.c

396 static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)
405 		sip = 0;
410 		 * and is in same subnet as sip
415 		sip = 0;
429 	return !inet_confirm_addr(net, in_dev, sip, tip, scope);
432 static int arp_accept(struct in_device *in_dev, __be32 sip)
442 	case 2: /* Create a neighbor in the arp table only if sip
446 		return !!inet_confirm_addr(net, in_dev, sip, 0, scope);
452 static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev)
459 	rt = ip_route_output(net, sip, tip, 0, l3mdev_master_ifindex_rcu(dev),
521 				__be32 sip, __be32 tip)
528 	if (sip == tip)
673 			__be32 sip, __be32 tip,
676 	bool is_garp = tip == sip;
690 		*addr_type = inet_addr_type_dev_table(net, dev, sip);
710 	__be32 sip, tip;
773 	memcpy(&sip, arp_ptr, 4);
798 	if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP))
830 	if (sip == 0) {
833 		    !arp_ignore(in_dev, sip, tip))
834 			arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip,
840 	    ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
848 			dont_send = arp_ignore(in_dev, sip, tip);
850 				dont_send = arp_filter(sip, tip, dev);
852 				n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
855 						     sip, dev, tip, sha,
865 			     arp_fwd_pvlan(in_dev, dev, rt, sip, tip) ||
868 				n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
876 						     sip, dev, tip, sha,
891 	n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
894 	if (n || arp_accept(in_dev, sip)) {
896 				      sip, tip, sha, tha);
899 	if (arp_accept(in_dev, sip)) {
910 			inet_addr_type_dev_table(net, dev, sip) ==
912 			n = __neigh_lookup(&arp_tbl, &sip, dev, 1);