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Commit 6fd05633 authored by Ihar Hrachyshka's avatar Ihar Hrachyshka Committed by David S. Miller
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arp: decompose is_garp logic into a separate function 



The code is quite involving already to earn a separate function for
itself. If anything, it helps arp_process readability.

Signed-off-by: default avatarIhar Hrachyshka <ihrachys@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 34eb5fe0

net/ipv4/arp.c

+23 −12
Original line number Diff line number Diff line
@@ -641,6 +641,27 @@ void arp_xmit(struct sk_buff *skb) 
}

EXPORT_SYMBOL(arp_xmit);



static bool arp_is_garp(struct net_device *dev, int addr_type,

			__be16 ar_op,

			__be32 sip, __be32 tip,

			unsigned char *sha, unsigned char *tha)

{

	bool is_garp = tip == sip && addr_type == RTN_UNICAST;



	/* Gratuitous ARP _replies_ also require target hwaddr to be

	 * the same as source.

	 */

	if (is_garp && ar_op == htons(ARPOP_REPLY))

		is_garp =

			/* IPv4 over IEEE 1394 doesn't provide target

			 * hardware address field in its ARP payload.

			 */

			tha &&

			!memcmp(tha, sha, dev->addr_len);



	return is_garp;

}



/*

 *	Process an arp request.

 */
@@ -844,18 +865,8 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) 
		   It is possible, that this option should be enabled for some

		   devices (strip is candidate)

		 */

		is_garp = tip == sip && addr_type == RTN_UNICAST;



		/* Gratuitous ARP _replies_ also require target hwaddr to be

		 * the same as source.

		 */

		if (is_garp && arp->ar_op == htons(ARPOP_REPLY))

			is_garp =

				/* IPv4 over IEEE 1394 doesn't provide target

				 * hardware address field in its ARP payload.

				 */

				tha &&

				!memcmp(tha, sha, dev->addr_len);

		is_garp = arp_is_garp(dev, addr_type, arp->ar_op,

				      sip, tip, sha, tha);



		if (!n &&

		    ((arp->ar_op == htons(ARPOP_REPLY)  &&