Creation of Cybook 2416 (actually Gen4) repository

include/net/esp.h

@@ -0,0 +1,65 @@
+#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 */
+		int			padlen;		/* 0..255 */
+		/* 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			ivinitted;
+		u8			*ivec;		/* ivec buffer */
+		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_hash	*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 int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
+				 int offset, int len)
+{
+	struct hash_desc desc;
+	int err;
+
+	desc.tfm = esp->auth.tfm;
+	desc.flags = 0;
+
+	err = crypto_hash_init(&desc);
+	if (unlikely(err))
+		return err;
+	err = skb_icv_walk(skb, &desc, offset, len, crypto_hash_update);
+	if (unlikely(err))
+		return err;
+	return crypto_hash_final(&desc, esp->auth.work_icv);
+}
+
+#endif