[XFRM] STATE: Add a hook to obtain local/remote outbound address.

Outbound transformation replaces both source and destination address with
state's end-point addresses at the same time when IPsec tunnel mode.
It is also required to change them for Mobile IPv6 route optimization, but we
should care about the following differences:
 - changing result is not end-point but care-of address
 - either source or destination is replaced for each state
This hook is a common platform to change outbound address.
Based on MIPL2 kernel patch.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 0d735a5aba61..aa3ac994477b 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -266,6 +266,8 @@ struct xfrm_type
         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
+        xfrm_address_t          *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
+        xfrm_address_t          *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
         /* Estimate maximal size of result of transformation of a dgram */
         u32                     (*get_max_size)(struct xfrm_state *, int size);
 };