[PATCH 1/3] ipv4: Allocate fib metrics dynamically.

[David Miller <davem@davemloft.net>]

This is the initial gateway towards super-sharing metrics
if they are all set to zero for a route.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/ip_fib.h     |    2 +-
 net/ipv4/fib_semantics.c |    4 ++++
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 65d1fcd..2c0508a 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -77,7 +77,7 @@ struct fib_info {
 	int			fib_protocol;
 	__be32			fib_prefsrc;
 	u32			fib_priority;
-	u32			fib_metrics[RTAX_MAX];
+	u32			*fib_metrics;
 #define fib_mtu fib_metrics[RTAX_MTU-1]
 #define fib_window fib_metrics[RTAX_WINDOW-1]
 #define fib_rtt fib_metrics[RTAX_RTT-1]
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 9aff11d7..363ec39 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -152,6 +152,7 @@ static void free_fib_info_rcu(struct rcu_head *head)
 {
 	struct fib_info *fi = container_of(head, struct fib_info, rcu);
 
+	kfree(fi->fib_metrics);
 	kfree(fi);
 }
 
@@ -742,6 +743,9 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
 	fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL);
 	if (fi == NULL)
 		goto failure;
+	fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+	if (!fi->fib_metrics)
+		goto failure;
 	fib_info_cnt++;
 
 	fi->fib_net = hold_net(net);
-- 
1.7.3.4