net/ipv6: introduce fib6_info struct and helpers

Add fib6_info struct and alloc, destroy, hold and release helpers.

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

1 files changed, 55 insertions, 0 deletions

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 159f651dee55..630392ae12d8 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -38,6 +38,7 @@
 #endif
 
 struct rt6_info;
+struct fib6_info;
 
 struct fib6_config {
 	u32		fc_table;
@@ -132,6 +133,46 @@ struct fib6_nh {
 	int			nh_weight;
 };
 
+struct fib6_info {
+	struct fib6_table		*rt6i_table;
+	struct fib6_info __rcu		*rt6_next;
+	struct fib6_node __rcu		*rt6i_node;
+
+	/* Multipath routes:
+	 * siblings is a list of fib6_info that have the the same metric/weight,
+	 * destination, but not the same gateway. nsiblings is just a cache
+	 * to speed up lookup.
+	 */
+	struct list_head		rt6i_siblings;
+	unsigned int			rt6i_nsiblings;
+
+	atomic_t			rt6i_ref;
+	struct inet6_dev		*rt6i_idev;
+	unsigned long			expires;
+	struct dst_metrics		*fib6_metrics;
+#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
+
+	struct rt6key			rt6i_dst;
+	u32				rt6i_flags;
+	struct rt6key			rt6i_src;
+	struct rt6key			rt6i_prefsrc;
+
+	struct rt6_info * __percpu	*rt6i_pcpu;
+	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
+
+	u32				rt6i_metric;
+	u8				rt6i_protocol;
+	u8				fib6_type;
+	u8				exception_bucket_flushed:1,
+					should_flush:1,
+					dst_nocount:1,
+					dst_nopolicy:1,
+					dst_host:1,
+					unused:3;
+
+	struct fib6_nh			fib6_nh;
+};
+
 struct rt6_info {
 	struct dst_entry		dst;
 	struct rt6_info __rcu		*rt6_next;
@@ -291,6 +332,20 @@ static inline void ip6_rt_put(struct rt6_info *rt)
 
 void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
 
+struct rt6_info *fib6_info_alloc(gfp_t gfp_flags);
+void fib6_info_destroy(struct rt6_info *f6i);
+
+static inline void fib6_info_hold(struct rt6_info *f6i)
+{
+	atomic_inc(&f6i->rt6i_ref);
+}
+
+static inline void fib6_info_release(struct rt6_info *f6i)
+{
+	if (f6i && atomic_dec_and_test(&f6i->rt6i_ref))
+		fib6_info_destroy(f6i);
+}
+
 static inline void rt6_hold(struct rt6_info *rt)
 {
 	atomic_inc(&rt->rt6i_ref);