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