netns: embed ip6_dst_ops directly

struct net::ipv6.ip6_dst_ops is separatedly dynamically allocated,
but there is no fundamental reason for it. Embed it directly into
struct netns_ipv6.

For that:
* move struct dst_ops into separate header to fix circular dependencies
	I honestly tried not to, it's pretty impossible to do other way
* drop dynamical allocation, allocate together with netns

For a change, remove struct dst_ops::dst_net, it's deducible
by using container_of() given dst_ops pointer.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 31 insertions, 23 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index 7fc409c19b37..5a900ddcf10d 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -8,6 +8,7 @@
 #ifndef _NET_DST_H
 #define _NET_DST_H
 
+#include <net/dst_ops.h>
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/rcupdate.h>
@@ -102,28 +103,6 @@ struct dst_entry
         };
 };
 
-
-struct dst_ops
-{
-        unsigned short          family;
-        __be16                  protocol;
-        unsigned                gc_thresh;
-
-        int                     (*gc)(struct dst_ops *ops);
-        struct dst_entry *      (*check)(struct dst_entry *, __u32 cookie);
-        void                    (*destroy)(struct dst_entry *);
-        void                    (*ifdown)(struct dst_entry *,
-                                          struct net_device *dev, int how);
-        struct dst_entry *      (*negative_advice)(struct dst_entry *);
-        void                    (*link_failure)(struct sk_buff *);
-        void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
-        int                     (*local_out)(struct sk_buff *skb);
-
-        atomic_t                entries;
-        struct kmem_cache               *kmem_cachep;
-        struct net              *dst_net;
-};
-
 #ifdef __KERNEL__
 
 static inline u32
diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h
new file mode 100644
index 000000000000..d1ff9b7e99b8
--- /dev/null
+++ b/include/net/dst_ops.h
@@ -0,0 +1,28 @@
+#ifndef _NET_DST_OPS_H
+#define _NET_DST_OPS_H
+#include <linux/types.h>
+
+struct dst_entry;
+struct kmem_cachep;
+struct net_device;
+struct sk_buff;
+
+struct dst_ops {
+        unsigned short          family;
+        __be16                  protocol;
+        unsigned                gc_thresh;
+
+        int                     (*gc)(struct dst_ops *ops);
+        struct dst_entry *      (*check)(struct dst_entry *, __u32 cookie);
+        void                    (*destroy)(struct dst_entry *);
+        void                    (*ifdown)(struct dst_entry *,
+                                          struct net_device *dev, int how);
+        struct dst_entry *      (*negative_advice)(struct dst_entry *);
+        void                    (*link_failure)(struct sk_buff *);
+        void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
+        int                     (*local_out)(struct sk_buff *skb);
+
+        atomic_t                entries;
+        struct kmem_cache       *kmem_cachep;
+};
+#endif
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index afab4e4cbac7..dfeb2d7c425b 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -6,6 +6,7 @@
 
 #ifndef __NETNS_IPV6_H__
 #define __NETNS_IPV6_H__
+#include <net/dst_ops.h>
 
 struct ctl_table_header;
 
@@ -42,7 +43,7 @@ struct netns_ipv6 {
         struct timer_list       ip6_fib_timer;
         struct hlist_head       *fib_table_hash;
         struct fib6_table       *fib6_main_tbl;
-        struct dst_ops          *ip6_dst_ops;
+        struct dst_ops          ip6_dst_ops;
         unsigned int             ip6_rt_gc_expire;
         unsigned long            ip6_rt_last_gc;
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES