net: bridge: drop skb2/skb0 variables and use a local_rcv boolean

Currently if the packet is going to be received locally we set skb0 or
sometimes called skb2 variables to the original skb. This can get
confusing and also we can avoid one conditional on the fast path by
simply using a boolean and passing it around. Thanks to Roopa for the
name suggestion.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 15 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index c20c5be6fc22..dd8885def11b 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -131,13 +131,12 @@ static void br_do_proxy_arp(struct sk_buff *skb, struct net_bridge *br,
 /* note: already called with rcu_read_lock */
 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
+	bool local_rcv = false, mcast_hit = false, unicast = true;
 	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
 	const unsigned char *dest = eth_hdr(skb)->h_dest;
 	struct net_bridge_fdb_entry *dst = NULL;
-	bool mcast_hit = false, unicast = true;
 	struct net_bridge_mdb_entry *mdst;
 	struct net_bridge *br;
-	struct sk_buff *skb2;
 	u16 vid = 0;
 
 	if (!p || p->state == BR_STATE_DISABLED)
@@ -160,17 +159,13 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 
 	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
 
-	/* The packet skb2 goes to the local host (NULL to skip). */
-	skb2 = NULL;
-
-	if (br->dev->flags & IFF_PROMISC)
-		skb2 = skb;
+	local_rcv = !!(br->dev->flags & IFF_PROMISC);
 
 	if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
 		br_do_proxy_arp(skb, br, vid, p);
 
 	if (is_broadcast_ether_addr(dest)) {
-		skb2 = skb;
+		local_rcv = true;
 		unicast = false;
 	} else if (is_multicast_ether_addr(dest)) {
 		mdst = br_mdb_get(br, skb, vid);
@@ -178,12 +173,12 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 		    br_multicast_querier_exists(br, eth_hdr(skb))) {
 			if ((mdst && mdst->mglist) ||
 			    br_multicast_is_router(br)) {
-				skb2 = skb;
+				local_rcv = true;
 				br->dev->stats.multicast++;
 			}
 			mcast_hit = true;
 		} else {
-			skb2 = skb;
+			local_rcv = true;
 			br->dev->stats.multicast++;
 		}
 		unicast = false;
@@ -194,16 +189,16 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 
 	if (dst) {
 		dst->used = jiffies;
-		br_forward(dst->dst, skb, skb2);
+		br_forward(dst->dst, skb, local_rcv);
 	} else {
 		if (!mcast_hit)
-			br_flood_forward(br, skb, skb2, unicast);
+			br_flood_forward(br, skb, local_rcv, unicast);
 		else
-			br_multicast_forward(mdst, skb, skb2);
+			br_multicast_forward(mdst, skb, local_rcv);
 	}
 
-	if (skb2)
-		return br_pass_frame_up(skb2);
+	if (local_rcv)
+		return br_pass_frame_up(skb);
 
 out:
 	return 0;