netns xfrm: add struct xfrm_state::xs_net

To avoid unnecessary complications with passing netns around.

* set once, very early after allocating
* once set, never changes

For a while create every xfrm_state in init_net.

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

1 files changed, 9 insertions, 1 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 9107d6f5c297..9da89039832c 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -130,6 +130,9 @@ struct xfrm_state_walk {
 /* Full description of state of transformer. */
 struct xfrm_state
 {
+#ifdef CONFIG_NET_NS
+        struct net              *xs_net;
+#endif
         union {
                 struct hlist_node       gclist;
                 struct hlist_node       bydst;
@@ -223,6 +226,11 @@ struct xfrm_state
         void                    *data;
 };
 
+static inline struct net *xs_net(struct xfrm_state *x)
+{
+        return read_pnet(&x->xs_net);
+}
+
 /* xflags - make enum if more show up */
 #define XFRM_TIME_DEFER 1
 
@@ -1296,7 +1304,7 @@ extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
                            int (*func)(struct xfrm_state *, int, void*), void *);
 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
-extern struct xfrm_state *xfrm_state_alloc(void);
+extern struct xfrm_state *xfrm_state_alloc(struct net *net);
 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 
                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
                                           struct xfrm_policy *pol, int *err,