[PATCH 13/16 net-next v3] net: bridge: guard ARP/RARP proxy and suppression with CONFIG_IPV4

[Fernando Fernandez Mancera]

Historically, the bridge subsystem relied on CONFIG_INET to guard ARP and
RARP proxy and suppression routines. As CONFIG_IPV4 is decoupled from the
core stack and made optional, relying on CONFIG_INET is no longer accurate,
as ARP and RARP are exclusively IPv4 protocols.

Signed-off-by: Fernando Fernandez Mancera <fmancera@xxxxxxx>
---
 net/bridge/br_arp_nd_proxy.c | 2 ++
 net/bridge/br_device.c       | 2 +-
 net/bridge/br_input.c        | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c
index da15f4d7c1ae..1809648a883b 100644
--- a/net/bridge/br_arp_nd_proxy.c
+++ b/net/bridge/br_arp_nd_proxy.c
@@ -56,7 +56,9 @@ br_is_neigh_suppress_enabled_vid(const struct net_bridge_port *p, u16 vid)
 
 	return br_is_neigh_suppress_enabled(p, v);
 }
+#endif /* CONFIG_INET */
 
+#if IS_ENABLED(CONFIG_IPV4)
 static void br_arp_send(struct net_bridge *br, struct net_bridge_port *p,
 			struct net_device *dev, __be32 dest_ip, __be32 src_ip,
 			const unsigned char *dest_hw,
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index ce9ea9ac3d0a..a3e5a521178f 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -69,7 +69,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 				&state, &vlan))
 		goto out;
 
-	if (IS_ENABLED(CONFIG_INET) &&
+	if (IS_ENABLED(CONFIG_IPV4) &&
 	    (eth_hdr(skb)->h_proto == htons(ETH_P_ARP) ||
 	     eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
 	    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 4357d78524a6..584ac6c2215c 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -166,7 +166,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
 	BR_INPUT_SKB_CB(skb)->src_port_isolated = test_bit(BR_ISOLATED_BIT, &p->flags);
 
-	if (IS_ENABLED(CONFIG_INET) &&
+	if (IS_ENABLED(CONFIG_IPV4) &&
 	    (skb->protocol == htons(ETH_P_ARP) ||
 	     skb->protocol == htons(ETH_P_RARP))) {
 		br_do_proxy_suppress_arp(skb, br, vid, p);
-- 
2.55.0