61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
#ifndef _NET_ESP_H
|
|
#define _NET_ESP_H
|
|
|
|
#include <linux/crypto.h>
|
|
#include <net/xfrm.h>
|
|
#include <asm/scatterlist.h>
|
|
|
|
#define ESP_NUM_FAST_SG 4
|
|
|
|
struct esp_data
|
|
{
|
|
struct scatterlist sgbuf[ESP_NUM_FAST_SG];
|
|
|
|
/* Confidentiality */
|
|
struct {
|
|
u8 *key; /* Key */
|
|
int key_len; /* Key length */
|
|
u8 *ivec; /* ivec buffer */
|
|
/* ivlen is offset from enc_data, where encrypted data start.
|
|
* It is logically different of crypto_tfm_alg_ivsize(tfm).
|
|
* We assume that it is either zero (no ivec), or
|
|
* >= crypto_tfm_alg_ivsize(tfm). */
|
|
int ivlen;
|
|
int padlen; /* 0..255 */
|
|
struct crypto_blkcipher *tfm; /* crypto handle */
|
|
} conf;
|
|
|
|
/* Integrity. It is active when icv_full_len != 0 */
|
|
struct {
|
|
u8 *key; /* Key */
|
|
int key_len; /* Length of the key */
|
|
u8 *work_icv;
|
|
int icv_full_len;
|
|
int icv_trunc_len;
|
|
void (*icv)(struct esp_data*,
|
|
struct sk_buff *skb,
|
|
int offset, int len, u8 *icv);
|
|
struct crypto_tfm *tfm;
|
|
} auth;
|
|
};
|
|
|
|
extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len);
|
|
extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
|
|
extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
|
|
|
|
static inline void
|
|
esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset,
|
|
int len, u8 *auth_data)
|
|
{
|
|
struct crypto_tfm *tfm = esp->auth.tfm;
|
|
char *icv = esp->auth.work_icv;
|
|
|
|
memset(auth_data, 0, esp->auth.icv_trunc_len);
|
|
crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len);
|
|
skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update);
|
|
crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv);
|
|
memcpy(auth_data, icv, esp->auth.icv_trunc_len);
|
|
}
|
|
|
|
#endif
|