[IPV4]: Remove extra argument from arp_ignore.

arp_ignore has two arguments: dev & in_dev. dev is used for
inet_confirm_addr calling only.

inet_confirm_addr, in turn, either gets in_dev from the device passed
or iterates over all network devices if the device passed is NULL. It
seems logical to directly pass in_dev into inet_confirm_addr.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/inetdevice.h

@@ -135,7 +135,7 @@ extern int		devinet_ioctl(unsigned int cmd, void __user *);
 extern void		devinet_init(void);
 extern struct in_device	*inetdev_by_index(int);
 extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
-extern __be32		inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope);
+extern __be32		inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 
 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)

net/ipv4/arp.c

@@ -382,8 +382,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
 		read_unlock_bh(&neigh->lock);
 }
 
-static int arp_ignore(struct in_device *in_dev, struct net_device *dev,
-		      __be32 sip, __be32 tip)
+static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)
 {
 	int scope;
 
@@ -403,7 +402,7 @@ static int arp_ignore(struct in_device *in_dev, struct net_device *dev,
 	case 3:	/* Do not reply for scope host addresses */
 		sip = 0;
 		scope = RT_SCOPE_LINK;
-		dev = NULL;
+		in_dev = NULL;
 		break;
 	case 4:	/* Reserved */
 	case 5:
@@ -415,7 +414,7 @@ static int arp_ignore(struct in_device *in_dev, struct net_device *dev,
 	default:
 		return 0;
 	}
-	return !inet_confirm_addr(dev, sip, tip, scope);
+	return !inet_confirm_addr(in_dev, sip, tip, scope);
 }
 
 static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev)
@@ -807,7 +806,7 @@ static int arp_process(struct sk_buff *skb)
 	if (sip == 0) {
 		if (arp->ar_op == htons(ARPOP_REQUEST) &&
 		    inet_addr_type(&init_net, tip) == RTN_LOCAL &&
-		    !arp_ignore(in_dev,dev,sip,tip))
+		    !arp_ignore(in_dev, sip, tip))
 			arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
 				 dev->dev_addr, sha);
 		goto out;
@@ -825,7 +824,7 @@ static int arp_process(struct sk_buff *skb)
 				int dont_send = 0;
 
 				if (!dont_send)
-					dont_send |= arp_ignore(in_dev,dev,sip,tip);
+					dont_send |= arp_ignore(in_dev,sip,tip);
 				if (!dont_send && IN_DEV_ARPFILTER(in_dev))
 					dont_send |= arp_filter(sip,tip,dev);
 				if (!dont_send)

net/ipv4/devinet.c

@@ -968,24 +968,19 @@ static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
 
 /*
  * Confirm that local IP address exists using wildcards:
- * - dev: only on this interface, 0=any interface
+ * - in_dev: only on this interface, 0=any interface
  * - dst: only in the same subnet as dst, 0=any dst
  * - local: address, 0=autoselect the local address
  * - scope: maximum allowed scope value for the local address
  */
-__be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope)
+__be32 inet_confirm_addr(struct in_device *in_dev,
+			 __be32 dst, __be32 local, int scope)
 {
 	__be32 addr = 0;
-	struct in_device *in_dev;
-
-	if (dev) {
-		rcu_read_lock();
-		if ((in_dev = __in_dev_get_rcu(dev)))
-			addr = confirm_addr_indev(in_dev, dst, local, scope);
-		rcu_read_unlock();
+	struct net_device *dev;
 
-		return addr;
-	}
+	if (in_dev != NULL)
+		return confirm_addr_indev(in_dev, dst, local, scope);
 
 	read_lock(&dev_base_lock);
 	rcu_read_lock();