diff options
Diffstat (limited to 'include/net/esp.h')
| -rw-r--r-- | include/net/esp.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/include/net/esp.h b/include/net/esp.h new file mode 100644 index 0000000..90cd94f --- /dev/null +++ b/include/net/esp.h @@ -0,0 +1,59 @@ +#ifndef _NET_ESP_H +#define _NET_ESP_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_tfm *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 |
