[IPV4]: Convert IPv4 devconf to an array

This patch converts the ipv4_devconf config members (everything except
sysctl) to an array.  This allows easier manipulation which will be
needed later on to provide better management of default config values.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 7110779..e00767e 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -877,7 +877,7 @@
 
 	n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
 
-	if (ipv4_devconf.arp_accept) {
+	if (IPV4_DEVCONF_ALL(ARP_ACCEPT)) {
 		/* Unsolicited ARP is not accepted by default.
 		   It is possible, that this option should be enabled for some
 		   devices (strip is candidate)
@@ -987,11 +987,11 @@
 			return 0;
 		}
 		if (dev == NULL) {
-			ipv4_devconf.proxy_arp = 1;
+			IPV4_DEVCONF_ALL(PROXY_ARP) = 1;
 			return 0;
 		}
 		if (__in_dev_get_rtnl(dev)) {
-			__in_dev_get_rtnl(dev)->cnf.proxy_arp = 1;
+			IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, 1);
 			return 0;
 		}
 		return -ENXIO;
@@ -1093,11 +1093,12 @@
 			return pneigh_delete(&arp_tbl, &ip, dev);
 		if (mask == 0) {
 			if (dev == NULL) {
-				ipv4_devconf.proxy_arp = 0;
+				IPV4_DEVCONF_ALL(PROXY_ARP) = 0;
 				return 0;
 			}
 			if (__in_dev_get_rtnl(dev)) {
-				__in_dev_get_rtnl(dev)->cnf.proxy_arp = 0;
+				IN_DEV_CONF_SET(__in_dev_get_rtnl(dev),
+						PROXY_ARP, 0);
 				return 0;
 			}
 			return -ENXIO;