IPv4: route.c: Change checks against 0xffffffff to ipv4_is_lbcast()

Change a few checks against the hardcoded broadcast address,
0xffffffff, to ipv4_is_lbcast().  Remove some existing checks
using ipv4_is_lbcast() that are now obviously superfluous.
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/route.c

@@ -2124,7 +2124,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	    ipv4_is_loopback(saddr))
 		goto martian_source;
 
-	if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0))
+	if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0))
 		goto brd_input;
 
 	/* Accept zero addresses only to limited broadcast;
@@ -2133,8 +2133,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	if (ipv4_is_zeronet(saddr))
 		goto martian_source;
 
-	if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) ||
-	    ipv4_is_loopback(daddr))
+	if (ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr))
 		goto martian_destination;
 
 	/*
@@ -2367,11 +2366,11 @@ static int __mkroute_output(struct rtable **result,
 	if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags & IFF_LOOPBACK))
 		return -EINVAL;
 
-	if (fl->fl4_dst == htonl(0xFFFFFFFF))
+	if (ipv4_is_lbcast(fl->fl4_dst))
 		res->type = RTN_BROADCAST;
 	else if (ipv4_is_multicast(fl->fl4_dst))
 		res->type = RTN_MULTICAST;
-	else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst))
+	else if (ipv4_is_zeronet(fl->fl4_dst))
 		return -EINVAL;
 
 	if (dev_out->flags & IFF_LOOPBACK)
@@ -2530,7 +2529,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
 
 		if (oldflp->oif == 0 &&
 		    (ipv4_is_multicast(oldflp->fl4_dst) ||
-		     oldflp->fl4_dst == htonl(0xFFFFFFFF))) {
+		     ipv4_is_lbcast(oldflp->fl4_dst))) {
 			/* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
 			dev_out = __ip_dev_find(net, oldflp->fl4_src, false);
 			if (dev_out == NULL)
@@ -2574,7 +2573,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
 			goto out;	/* Wrong error code */
 
 		if (ipv4_is_local_multicast(oldflp->fl4_dst) ||
-		    oldflp->fl4_dst == htonl(0xFFFFFFFF)) {
+		    ipv4_is_lbcast(oldflp->fl4_dst)) {
 			if (!fl.fl4_src)
 				fl.fl4_src = inet_select_addr(dev_out, 0,
 							      RT_SCOPE_LINK);