[IPSEC]: Add support for combined mode algorithms
This patch adds support for combined mode algorithms with GCM being
the first algorithm supported.
Combined mode algorithms can be added through the xfrm_user interface
using the new algorithm payload type XFRMA_ALG_AEAD. Each algorithms
is identified by its name and the ICV length.
For the purposes of matching algorithms in xfrm_tmpl structures,
combined mode algorithms occupy the same name space as encryption
algorithms. This is in line with how they are negotiated using IKE.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 9b5b00c..e31b8c8 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -96,6 +96,13 @@
char alg_key[0];
};
+struct xfrm_algo_aead {
+ char alg_name[64];
+ int alg_key_len; /* in bits */
+ int alg_icv_len; /* in bits */
+ char alg_key[0];
+};
+
struct xfrm_stats {
__u32 replay_window;
__u32 replay;
@@ -270,6 +277,7 @@
XFRMA_LASTUSED,
XFRMA_POLICY_TYPE, /* struct xfrm_userpolicy_type */
XFRMA_MIGRATE,
+ XFRMA_ALG_AEAD, /* struct xfrm_algo_aead */
__XFRMA_MAX
#define XFRMA_MAX (__XFRMA_MAX - 1)