[IPSEC]: Move output replay code into xfrm_output

The replay counter is one of only two remaining things in the output code
that requires a lock on the xfrm state (the other being the crypto).  This
patch moves it into the generic xfrm_output so we can remove the lock from
the transforms themselves.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 1 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index bb9193434eb3..a267725f9753 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -2,7 +2,6 @@
 #define _NET_XFRM_H
 
 #include <linux/compiler.h>
-#include <linux/in.h>
 #include <linux/xfrm.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
@@ -16,6 +15,7 @@
 
 #include <net/sock.h>
 #include <net/dst.h>
+#include <net/ip.h>
 #include <net/route.h>
 #include <net/ipv6.h>
 #include <net/ip6_fib.h>
@@ -279,6 +279,7 @@ struct xfrm_type
         __u8                    proto;
         __u8                    flags;
 #define XFRM_TYPE_NON_FRAGMENT  1
+#define XFRM_TYPE_REPLAY_PROT   2
 
         int                     (*init_state)(struct xfrm_state *x);
         void                    (*destructor)(struct xfrm_state *);
@@ -419,6 +420,23 @@ extern int xfrm_unregister_km(struct xfrm_mgr *km);
 
 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
 
+/*
+ * This structure is used for the duration where packets are being
+ * transformed by IPsec.  As soon as the packet leaves IPsec the
+ * area beyond the generic IP part may be overwritten.
+ */
+struct xfrm_skb_cb {
+        union {
+                struct inet_skb_parm h4;
+                struct inet6_skb_parm h6;
+        } header;
+
+        /* Sequence number for replay protection. */
+        u64 seq;
+};
+
+#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
+
 /* Audit Information */
 struct xfrm_audit
 {