QEMU HARDDISK   
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 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _TLS_OFFLOAD_H
#define _TLS_OFFLOAD_H

#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/crypto.h>
#include <linux/socket.h>
#include <linux/tcp.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>

#include <net/net_namespace.h>
#include <net/tcp.h>
#include <net/strparser.h>
#include <crypto/aead.h>
#include <uapi/linux/tls.h>

#include <linux/rh_kabi.h>

struct tls_rec;

/* Maximum data size carried in a TLS record */
#define TLS_MAX_PAYLOAD_SIZE		((size_t)1 << 14)

#define TLS_HEADER_SIZE			5
#define TLS_NONCE_OFFSET		TLS_HEADER_SIZE

#define TLS_CRYPTO_INFO_READY(info)	((info)->cipher_type)

#define TLS_AAD_SPACE_SIZE		13

#define TLS_MAX_IV_SIZE			16
#define TLS_MAX_SALT_SIZE		4
#define TLS_TAG_SIZE			16
#define TLS_MAX_REC_SEQ_SIZE		8
#define TLS_MAX_AAD_SIZE		TLS_AAD_SPACE_SIZE

/* For CCM mode, the full 16-bytes of IV is made of '4' fields of given sizes.
 *
 * IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
 *
 * The field 'length' is encoded in field 'b0' as '(length width - 1)'.
 * Hence b0 contains (3 - 1) = 2.
 */
#define TLS_AES_CCM_IV_B0_BYTE		2
#define TLS_SM4_CCM_IV_B0_BYTE		2

enum {
	TLS_BASE,
	TLS_SW,
	TLS_HW,
	TLS_HW_RECORD,
	TLS_NUM_CONFIG,
};

struct tx_work {
	struct delayed_work work;
	struct sock *sk;
};

struct tls_sw_context_tx {
	struct crypto_aead *aead_send;
	struct crypto_wait async_wait;
	struct tx_work tx_work;
	struct tls_rec *open_rec;
	struct list_head tx_list;
	atomic_t encrypt_pending;
	u8 async_capable:1;

#define BIT_TX_SCHEDULED	0
#define BIT_TX_CLOSING		1
	unsigned long tx_bitmask;
};

struct tls_strparser {
	struct sock *sk;

	u32 mark : 8;
	u32 stopped : 1;
	u32 copy_mode : 1;
	u32 mixed_decrypted : 1;

	bool msg_ready;

	struct strp_msg stm;

	struct sk_buff *anchor;
	struct work_struct work;
};

struct tls_sw_context_rx {
	struct crypto_aead *aead_recv;
	struct crypto_wait async_wait;
	struct sk_buff_head rx_list;	/* list of decrypted 'data' records */
	void (*saved_data_ready)(struct sock *sk);

	u8 reader_present;
	u8 async_capable:1;
	u8 zc_capable:1;
	u8 reader_contended:1;

	struct tls_strparser strp;

	atomic_t decrypt_pending;
	struct sk_buff_head async_hold;
	struct wait_queue_head wq;
};

struct tls_record_info {
	struct list_head list;
	u32 end_seq;
	int len;
	int num_frags;
	skb_frag_t frags[MAX_SKB_FRAGS];
};

#define TLS_DRIVER_STATE_SIZE_TX	16
struct tls_offload_context_tx {
	struct crypto_aead *aead_send;
	spinlock_t lock;	/* protects recor