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[IPSEC]: Add support for combined mode algorithms

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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>
This commit is contained in:
Herbert Xu
2008-01-28 19:37:29 -08:00
committed by David S. Miller
parent 6fbf2cb774
commit 1a6509d991
7 changed files with 347 additions and 32 deletions
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8
include/net/xfrm.h
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@@ -159,6 +159,7 @@ struct xfrm_state
struct xfrm_algo *aalg;
struct xfrm_algo *ealg;
struct xfrm_algo *calg;
struct xfrm_algo_aead *aead;
/* Data for encapsulator */
struct xfrm_encap_tmpl *encap;
@@ -1108,6 +1109,10 @@ static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
/*
* xfrm algorithm information
*/
struct xfrm_algo_aead_info {
u16 icv_truncbits;
};
struct xfrm_algo_auth_info {
u16 icv_truncbits;
u16 icv_fullbits;
@@ -1127,6 +1132,7 @@ struct xfrm_algo_desc {
char *compat;
u8 available:1;
union {
struct xfrm_algo_aead_info aead;
struct xfrm_algo_auth_info auth;
struct xfrm_algo_encr_info encr;
struct xfrm_algo_comp_info comp;
@@ -1343,6 +1349,8 @@ extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
int probe);
struct hash_desc;
struct scatterlist;