net/ipv4/arp.c

66  *					bonding can change the skb before
125 static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
126 static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
127 static void parp_redo(struct sk_buff *skb);
294 static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb)
296 	dst_link_failure(skb);
297 	kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_FAILED);
308 	struct sk_buff *skb;
314 	skb = arp_create(type, ptype, dest_ip, dev, src_ip,
316 	if (!skb)
319 	skb_dst_set(skb, dst_clone(dst));
320 	arp_xmit(skb);
333 static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
352 		if (skb && inet_addr_type_dev_table(dev_net(dev), dev,
353 					  ip_hdr(skb)->saddr) == RTN_LOCAL)
354 			saddr = ip_hdr(skb)->saddr;
357 		if (!skb)
359 		saddr = ip_hdr(skb)->saddr;
390 	if (skb && !(dev->priv_flags & IFF_XMIT_DST_RELEASE))
391 		dst = skb_dst(skb);
551 	struct sk_buff *skb;
561 	skb = alloc_skb(arp_hdr_len(dev) + hlen + tlen, GFP_ATOMIC);
562 	if (!skb)
565 	skb_reserve(skb, hlen);
566 	skb_reset_network_header(skb);
567 	arp = skb_put(skb, arp_hdr_len(dev));
568 	skb->dev = dev;
569 	skb->protocol = htons(ETH_P_ARP);
578 	if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0)
644 	return skb;
647 	kfree_skb(skb);
652 static int arp_xmit_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
654 	return dev_queue_xmit(skb);
660 void arp_xmit(struct sk_buff *skb)
664 		dev_net(skb->dev), NULL, skb, NULL, skb->dev,
699 static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb)
701 	struct net_device *dev = skb->dev;
722 	arp = arp_hdr(skb);
822 	if (arp->ar_op == htons(ARPOP_REQUEST) && skb_metadata_dst(skb))
824 			    iptunnel_metadata_reply(skb_metadata_dst(skb),
838 	    ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
840 		rt = skb_rtable(skb);
870 				if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED ||
871 				    skb->pkt_type == PACKET_HOST ||
879 						       in_dev->arp_parms, skb);
931 		    skb->pkt_type != PACKET_HOST)
939 	consume_skb(skb);
946 	kfree_skb(skb);
950 static void parp_redo(struct sk_buff *skb)
952 	arp_process(dev_net(skb->dev), NULL, skb);
964 static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
971 	    skb->pkt_type == PACKET_OTHERHOST ||
972 	    skb->pkt_type == PACKET_LOOPBACK)
975 	skb = skb_share_check(skb, GFP_ATOMIC);
976 	if (!skb)
980 	if (!pskb_may_pull(skb, arp_hdr_len(dev)))
983 	arp = arp_hdr(skb);
987 	memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
990 		       dev_net(dev), NULL, skb, dev, NULL,
994 	consume_skb(skb);
997 	kfree_skb(skb);