net: Move free of fib_metrics to helper

Move the refcounting and potential free of dst metrics associated
with a fib entry to a helper and use it in both ipv4 and ipv6.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/net/ip.h b/include/net/ip.h
index 8cbe7e8c9e1e..8fdd58ce580d 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -422,6 +422,12 @@ static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
 
 struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
 					int fc_mx_len);
+static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
+{
+	if (fib_metrics != &dst_default_metrics &&
+	    refcount_dec_and_test(&fib_metrics->refcnt))
+		kfree(fib_metrics);
+}
 
 u32 ip_idents_reserve(u32 hash, int segs);
 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);