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xfrm: Add basic infrastructure to support IPsec extended sequence numbers

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This patch adds the struct xfrm_replay_state_esn which will be
used to support IPsec extended sequence numbers and anti replay windows
bigger than 32 packets. Also we add a function that returns the actual
size of the xfrm_replay_state_esn, a xfrm netlink atribute and a xfrm state
flag for the use of extended sequence numbers.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-03-08 00:05:43 +00:00 committed by David S. Miller
parent a5079d084f
commit 9736acf395
2 changed files with 19 additions and 0 deletions
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12
include/linux/xfrm.h
View file

@ -84,6 +84,16 @@ struct xfrm_replay_state {
__u32 bitmap;
};
struct xfrm_replay_state_esn {
unsigned int bmp_len;
__u32 oseq;
__u32 seq;
__u32 oseq_hi;
__u32 seq_hi;
__u32 replay_window;
__u32 bmp[0];
};
struct xfrm_algo {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
@ -284,6 +294,7 @@ enum xfrm_attr_type_t {
XFRMA_ALG_AUTH_TRUNC, /* struct xfrm_algo_auth */
XFRMA_MARK, /* struct xfrm_mark */
XFRMA_TFCPAD, /* __u32 */
XFRMA_REPLAY_ESN_VAL, /* struct xfrm_replay_esn */
__XFRMA_MAX
#define XFRMA_MAX (__XFRMA_MAX - 1)
@ -351,6 +362,7 @@ struct xfrm_usersa_info {
#define XFRM_STATE_ICMP 16
#define XFRM_STATE_AF_UNSPEC 32
#define XFRM_STATE_ALIGN4 64
#define XFRM_STATE_ESN 128
};
struct xfrm_usersa_id {

7
include/net/xfrm.h
View file

@ -186,9 +186,11 @@ struct xfrm_state {
/* State for replay detection */
struct xfrm_replay_state replay;
struct xfrm_replay_state_esn *replay_esn;
/* Replay detection state at the time we sent the last notification */
struct xfrm_replay_state preplay;
struct xfrm_replay_state_esn *preplay_esn;
/* internal flag that only holds state for delayed aevent at the
* moment
@ -1569,6 +1571,11 @@ static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
}
static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
{
return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
}
#ifdef CONFIG_XFRM_MIGRATE
static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
{