ipv4: Attach FIB info to dst_default_metrics when possible

If there are no explicit metrics attached to a route, hook
fi->fib_info up to dst_default_metrics.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 10 insertions, 5 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index 94a8c234ea2a..484f80b69ada 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -97,6 +97,7 @@ struct dst_entry {
 #ifdef __KERNEL__
 
 extern u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
+extern const u32 dst_default_metrics[RTAX_MAX];
 
 #define DST_METRICS_READ_ONLY   0x1UL
 #define __DST_METRICS_PTR(Y)    \
diff --git a/net/core/dst.c b/net/core/dst.c
index 578893505702..c1674fde827d 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -164,7 +164,7 @@ int dst_discard(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(dst_discard);
 
-static const u32 dst_default_metrics[RTAX_MAX];
+const u32 dst_default_metrics[RTAX_MAX];
 
 void *dst_alloc(struct dst_ops *ops)
 {
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 363ec39228d3..48e93a560077 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -152,7 +152,8 @@ 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);
+        if (fi->fib_metrics != (u32 *) dst_default_metrics)
+                kfree(fi->fib_metrics);
         kfree(fi);
 }
 
@@ -743,9 +744,12 @@ 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;
+        if (cfg->fc_mx) {
+                fi->fib_metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+                if (!fi->fib_metrics)
+                        goto failure;
+        } else
+                fi->fib_metrics = (u32 *) dst_default_metrics;
         fib_info_cnt++;
 
         fi->fib_net = hold_net(net);