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>
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 159f651..630392a 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);