[linux-block.git] / net / tls / tls.h

/*
 * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
 * 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_INT_H
#define _TLS_INT_H

#include <asm/byteorder.h>
#include <linux/types.h>
#include <linux/skmsg.h>
#include <net/tls.h>

#define TLS_PAGE_ORDER	(min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER,	\
			       TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))

#define __TLS_INC_STATS(net, field)				\
	__SNMP_INC_STATS((net)->mib.tls_statistics, field)
#define TLS_INC_STATS(net, field)				\
	SNMP_INC_STATS((net)->mib.tls_statistics, field)
#define TLS_DEC_STATS(net, field)				\
	SNMP_DEC_STATS((net)->mib.tls_statistics, field)

/* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
 * allocated or mapped for each TLS record. After encryption, the records are
 * stores in a linked list.
 */
struct tls_rec {
	struct list_head list;
	int tx_ready;
	int tx_flags;

	struct sk_msg msg_plaintext;
	struct sk_msg msg_encrypted;

	/* AAD | msg_plaintext.sg.data | sg_tag */
	struct scatterlist sg_aead_in[2];
	/* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
	struct scatterlist sg_aead_out[2];

	char content_type;
	struct scatterlist sg_content_type;

	struct sock *sk;

	char aad_space[TLS_AAD_SPACE_SIZE];
	u8 iv_data[MAX_IV_SIZE];
	struct aead_request aead_req;
	u8 aead_req_ctx[];
};

int __net_init tls_proc_init(struct net *net);
void __net_exit tls_proc_fini(struct net *net);

struct tls_context *tls_ctx_create(struct sock *sk);
void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
void update_sk_prot(struct sock *sk, struct tls_context *ctx);

int wait_on_pending_writer(struct sock *sk, long *timeo);
int tls_sk_query(struct sock *sk, int optname, char __user *optval,
		 int __user *optlen);
int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
		  unsigned int optlen);
void tls_err_abort(struct sock *sk, int err);

int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
void tls_sw_strparser_done(struct tls_context *tls_ctx);
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
			   int offset, size_t size, int flags);
int tls_sw_sendpage(struct sock *sk, struct page *page,
		    int offset, size_t size, int flags);
void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
void tls_sw_release_resources_tx(struct sock *sk);
void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
void tls_sw_free_resources_rx(struct sock *sk);
void tls_sw_release_resources_rx(struct sock *sk);
void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
		   int flags, int *addr_len);
bool tls_sw_sock_is_readable(struct sock *sk);
ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
			   struct pipe_inode_info *pipe,
			   size_t len, unsigned int flags);

int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
int tls_device_sendpage(struct sock *sk, struct page *page,
			int offset, size_t size, int flags);
int tls_tx_records(struct sock *sk, int flags);

void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
void tls_device_write_space(struct sock *sk, struct tls_context *ctx);

int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
		     unsigned char *record_type);
int decrypt_skb(struct sock *sk, struct scatterlist *sgout);

int tls_sw_fallback_init(struct sock *sk,
			 struct tls_offload_context_tx *offload_ctx,
			 struct tls_crypto_info *crypto_info);

int tls_strp_dev_init(void);
void tls_strp_dev_exit(void);

void tls_strp_done(struct tls_strparser *strp);
void tls_strp_stop(struct tls_strparser *strp);
int tls_strp_init(struct tls_strparser *strp, struct sock *sk);
void tls_strp_data_ready(struct tls_strparser *strp);

void tls_strp_check_rcv(struct tls_strparser *strp);
void tls_strp_msg_done(struct tls_strparser *strp);

int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb);
void tls_rx_msg_ready(struct tls_strparser *strp);

void tls_strp_msg_load(struct tls_strparser *strp, bool force_refresh);
int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
int tls_strp_msg_hold(struct tls_strparser *strp, struct sk_buff_head *dst);

static inline struct tls_msg *tls_msg(struct sk_buff *skb)
{
	struct sk_skb_cb *scb = (struct sk_skb_cb *)skb->cb;

	return &scb->tls;
}

static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
{
	DEBUG_NET_WARN_ON_ONCE(!ctx->strp.msg_ready || !ctx->strp.anchor->len);
	return ctx->strp.anchor;
}

static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
{
	return ctx->strp.msg_ready;
}

#ifdef CONFIG_TLS_DEVICE
int tls_device_init(void);
void tls_device_cleanup(void);
int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
void tls_device_free_resources_tx(struct sock *sk);
int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
void tls_device_offload_cleanup_rx(struct sock *sk);
void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx);
#else
static inline int tls_device_init(void) { return 0; }
static inline void tls_device_cleanup(void) {}

static inline int
tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
{
	return -EOPNOTSUPP;
}

static inline void tls_device_free_resources_tx(struct sock *sk) {}

static inline int
tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
{
	return -EOPNOTSUPP;
}

static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
static inline void
tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}

static inline int
tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
{
	return 0;
}
#endif

int tls_push_sg(struct sock *sk, struct tls_context *ctx,
		struct scatterlist *sg, u16 first_offset,
		int flags);
int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
			    int flags);
void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);

static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
{
	return !!ctx->partially_sent_record;
}

static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
{
	return tls_ctx->pending_open_record_frags;
}

static inline bool tls_bigint_increment(unsigned char *seq, int len)
{
	int i;

	for (i = len - 1; i >= 0; i--) {
		++seq[i];
		if (seq[i] != 0)
			break;
	}

	return (i == -1);
}

static inline void tls_bigint_subtract(unsigned char *seq, int  n)
{
	u64 rcd_sn;
	__be64 *p;

	BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);

	p = (__be64 *)seq;
	rcd_sn = be64_to_cpu(*p);
	*p = cpu_to_be64(rcd_sn - n);
}

static inline void
tls_advance_record_sn(struct sock *sk, struct tls_prot_info *prot,
		      struct cipher_context *ctx)
{
	if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
		tls_err_abort(sk, -EBADMSG);

	if (prot->version != TLS_1_3_VERSION &&
	    prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
		tls_bigint_increment(ctx->iv + prot->salt_size,
				     prot->iv_size);
}

static inline void
tls_xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
{
	int i;

	if (prot->version == TLS_1_3_VERSION ||
	    prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
		for (i = 0; i < 8; i++)
			iv[i + 4] ^= seq[i];
	}
}

static inline void
tls_fill_prepend(struct tls_context *ctx, char *buf, size_t plaintext_len,
		 unsigned char record_type)
{
	struct tls_prot_info *prot = &ctx->prot_info;
	size_t pkt_len, iv_size = prot->iv_size;

	pkt_len = plaintext_len + prot->tag_size;
	if (prot->version != TLS_1_3_VERSION &&
	    prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
		pkt_len += iv_size;

		memcpy(buf + TLS_NONCE_OFFSET,
		       ctx->tx.iv + prot->salt_size, iv_size);
	}

	/* we cover nonce explicit here as well, so buf should be of
	 * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
	 */
	buf[0] = prot->version == TLS_1_3_VERSION ?
		   TLS_RECORD_TYPE_DATA : record_type;
	/* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
	buf[1] = TLS_1_2_VERSION_MINOR;
	buf[2] = TLS_1_2_VERSION_MAJOR;
	/* we can use IV for nonce explicit according to spec */
	buf[3] = pkt_len >> 8;
	buf[4] = pkt_len & 0xFF;
}

static inline
void tls_make_aad(char *buf, size_t size, char *record_sequence,
		  unsigned char record_type, struct tls_prot_info *prot)
{
	if (prot->version != TLS_1_3_VERSION) {
		memcpy(buf, record_sequence, prot->rec_seq_size);
		buf += 8;
	} else {
		size += prot->tag_size;
	}

	buf[0] = prot->version == TLS_1_3_VERSION ?
		  TLS_RECORD_TYPE_DATA : record_type;
	buf[1] = TLS_1_2_VERSION_MAJOR;
	buf[2] = TLS_1_2_VERSION_MINOR;
	buf[3] = size >> 8;
	buf[4] = size & 0xFF;
}

#endif
Commit	Line	Data
58790314	1	/*
84c61fe1	2	* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
58790314 JK	3	* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
	4	* Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
	5	*
	6	* This software is available to you under a choice of one of two
	7	* licenses. You may choose to be licensed under the terms of the GNU
	8	* General Public License (GPL) Version 2, available from the file
	9	* COPYING in the main directory of this source tree, or the
	10	* OpenIB.org BSD license below:
	11	*
	12	* Redistribution and use in source and binary forms, with or
	13	* without modification, are permitted provided that the following
	14	* conditions are met:
	15	*
	16	* - Redistributions of source code must retain the above
	17	* copyright notice, this list of conditions and the following
	18	* disclaimer.
	19	*
	20	* - Redistributions in binary form must reproduce the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer in the documentation and/or other materials
	23	* provided with the distribution.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	26	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	27	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	28	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	29	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	30	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	31	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	32	* SOFTWARE.
	33	*/
	34
	35	#ifndef _TLS_INT_H
	36	#define _TLS_INT_H
	37
	38	#include <asm/byteorder.h>
	39	#include <linux/types.h>
	40	#include <linux/skmsg.h>
	41	#include <net/tls.h>
	42
fd31f399 JK	43	#define TLS_PAGE_ORDER (min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER, \
	44	TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))
	45
58790314 JK	46	#define __TLS_INC_STATS(net, field) \
	47	__SNMP_INC_STATS((net)->mib.tls_statistics, field)
	48	#define TLS_INC_STATS(net, field) \
	49	SNMP_INC_STATS((net)->mib.tls_statistics, field)
	50	#define TLS_DEC_STATS(net, field) \
	51	SNMP_DEC_STATS((net)->mib.tls_statistics, field)
	52
	53	/* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
	54	* allocated or mapped for each TLS record. After encryption, the records are
	55	* stores in a linked list.
	56	*/
	57	struct tls_rec {
	58	struct list_head list;
	59	int tx_ready;
	60	int tx_flags;
	61
	62	struct sk_msg msg_plaintext;
	63	struct sk_msg msg_encrypted;
	64
	65	/* AAD \| msg_plaintext.sg.data \| sg_tag */
	66	struct scatterlist sg_aead_in[2];
	67	/* AAD \| msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
	68	struct scatterlist sg_aead_out[2];
	69
	70	char content_type;
	71	struct scatterlist sg_content_type;
	72
8d338c76 HX	73	struct sock *sk;
8d338c76 HX	74
58790314 JK	75	char aad_space[TLS_AAD_SPACE_SIZE];
	76	u8 iv_data[MAX_IV_SIZE];
	77	struct aead_request aead_req;
	78	u8 aead_req_ctx[];
	79	};
	80
	81	int __net_init tls_proc_init(struct net *net);
	82	void __net_exit tls_proc_fini(struct net *net);
	83
	84	struct tls_context tls_ctx_create(struct sock sk);
	85	void tls_ctx_free(struct sock sk, struct tls_context ctx);
	86	void update_sk_prot(struct sock sk, struct tls_context ctx);
	87
	88	int wait_on_pending_writer(struct sock sk, long timeo);
	89	int tls_sk_query(struct sock sk, int optname, char __user optval,
	90	int __user *optlen);
	91	int tls_sk_attach(struct sock sk, int optname, char __user optval,
	92	unsigned int optlen);
	93	void tls_err_abort(struct sock *sk, int err);
	94
	95	int tls_set_sw_offload(struct sock sk, struct tls_context ctx, int tx);
	96	void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
	97	void tls_sw_strparser_arm(struct sock sk, struct tls_context ctx);
	98	void tls_sw_strparser_done(struct tls_context *tls_ctx);
	99	int tls_sw_sendmsg(struct sock sk, struct msghdr msg, size_t size);
	100	int tls_sw_sendpage_locked(struct sock sk, struct page page,
	101	int offset, size_t size, int flags);
	102	int tls_sw_sendpage(struct sock sk, struct page page,
	103	int offset, size_t size, int flags);
	104	void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
	105	void tls_sw_release_resources_tx(struct sock *sk);
	106	void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
	107	void tls_sw_free_resources_rx(struct sock *sk);
	108	void tls_sw_release_resources_rx(struct sock *sk);
	109	void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
	110	int tls_sw_recvmsg(struct sock sk, struct msghdr msg, size_t len,
	111	int flags, int *addr_len);
	112	bool tls_sw_sock_is_readable(struct sock *sk);
	113	ssize_t tls_sw_splice_read(struct socket sock, loff_t ppos,
	114	struct pipe_inode_info *pipe,
	115	size_t len, unsigned int flags);
	116
	117	int tls_device_sendmsg(struct sock sk, struct msghdr msg, size_t size);
	118	int tls_device_sendpage(struct sock sk, struct page page,
	119	int offset, size_t size, int flags);
	120	int tls_tx_records(struct sock *sk, int flags);
	121
	122	void tls_sw_write_space(struct sock sk, struct tls_context ctx);
	123	void tls_device_write_space(struct sock sk, struct tls_context ctx);
	124
	125	int tls_process_cmsg(struct sock sk, struct msghdr msg,
	126	unsigned char *record_type);
541cc48b	127	int decrypt_skb(struct sock sk, struct scatterlist sgout);
58790314 JK	128
	129	int tls_sw_fallback_init(struct sock *sk,
	130	struct tls_offload_context_tx *offload_ctx,
	131	struct tls_crypto_info *crypto_info);
	132
84c61fe1 JK	133	int tls_strp_dev_init(void);
	134	void tls_strp_dev_exit(void);
	135
	136	void tls_strp_done(struct tls_strparser *strp);
	137	void tls_strp_stop(struct tls_strparser *strp);
	138	int tls_strp_init(struct tls_strparser strp, struct sock sk);
	139	void tls_strp_data_ready(struct tls_strparser *strp);
	140
	141	void tls_strp_check_rcv(struct tls_strparser *strp);
	142	void tls_strp_msg_done(struct tls_strparser *strp);
	143
	144	int tls_rx_msg_size(struct tls_strparser strp, struct sk_buff skb);
	145	void tls_rx_msg_ready(struct tls_strparser *strp);
	146
	147	void tls_strp_msg_load(struct tls_strparser *strp, bool force_refresh);
8b3c59a7	148	int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
d4e5db64	149	struct sk_buff tls_strp_msg_detach(struct tls_sw_context_rx ctx);
84c61fe1	150	int tls_strp_msg_hold(struct tls_strparser strp, struct sk_buff_head dst);
c618db2a	151
58790314 JK	152	static inline struct tls_msg tls_msg(struct sk_buff skb)
	153	{
	154	struct sk_skb_cb scb = (struct sk_skb_cb )skb->cb;
	155
	156	return &scb->tls;
	157	}
	158
541cc48b JK	159	static inline struct sk_buff tls_strp_msg(struct tls_sw_context_rx ctx)
541cc48b JK	160	{
84c61fe1 JK	161	DEBUG_NET_WARN_ON_ONCE(!ctx->strp.msg_ready \|\| !ctx->strp.anchor->len);
84c61fe1 JK	162	return ctx->strp.anchor;
541cc48b JK	163	}
541cc48b JK	164
b92a13d4 JK	165	static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
b92a13d4 JK	166	{
84c61fe1	167	return ctx->strp.msg_ready;
b92a13d4 JK	168	}
b92a13d4 JK	169
58790314	170	#ifdef CONFIG_TLS_DEVICE
816cd168	171	int tls_device_init(void);
58790314 JK	172	void tls_device_cleanup(void);
	173	int tls_set_device_offload(struct sock sk, struct tls_context ctx);
	174	void tls_device_free_resources_tx(struct sock *sk);
	175	int tls_set_device_offload_rx(struct sock sk, struct tls_context ctx);
	176	void tls_device_offload_cleanup_rx(struct sock *sk);
	177	void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
541cc48b	178	int tls_device_decrypted(struct sock sk, struct tls_context tls_ctx);
58790314	179	#else
816cd168	180	static inline int tls_device_init(void) { return 0; }
58790314 JK	181	static inline void tls_device_cleanup(void) {}
	182
	183	static inline int
	184	tls_set_device_offload(struct sock sk, struct tls_context ctx)
	185	{
	186	return -EOPNOTSUPP;
	187	}
	188
	189	static inline void tls_device_free_resources_tx(struct sock *sk) {}
	190
	191	static inline int
	192	tls_set_device_offload_rx(struct sock sk, struct tls_context ctx)
	193	{
	194	return -EOPNOTSUPP;
	195	}
	196
	197	static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
	198	static inline void
	199	tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
	200
	201	static inline int
541cc48b	202	tls_device_decrypted(struct sock sk, struct tls_context tls_ctx)
58790314 JK	203	{
	204	return 0;
	205	}
	206	#endif
	207
	208	int tls_push_sg(struct sock sk, struct tls_context ctx,
	209	struct scatterlist *sg, u16 first_offset,
	210	int flags);
	211	int tls_push_partial_record(struct sock sk, struct tls_context ctx,
	212	int flags);
	213	void tls_free_partial_record(struct sock sk, struct tls_context ctx);
	214
	215	static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
	216	{
	217	return !!ctx->partially_sent_record;
	218	}
	219
	220	static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
	221	{
	222	return tls_ctx->pending_open_record_frags;
	223	}
	224
	225	static inline bool tls_bigint_increment(unsigned char *seq, int len)
	226	{
	227	int i;
	228
	229	for (i = len - 1; i >= 0; i--) {
	230	++seq[i];
	231	if (seq[i] != 0)
	232	break;
	233	}
	234
	235	return (i == -1);
	236	}
	237
	238	static inline void tls_bigint_subtract(unsigned char *seq, int n)
	239	{
	240	u64 rcd_sn;
	241	__be64 *p;
	242
	243	BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);
	244
	245	p = (__be64 *)seq;
	246	rcd_sn = be64_to_cpu(*p);
	247	*p = cpu_to_be64(rcd_sn - n);
	248	}
	249
	250	static inline void
	251	tls_advance_record_sn(struct sock sk, struct tls_prot_info prot,
	252	struct cipher_context *ctx)
	253	{
	254	if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
	255	tls_err_abort(sk, -EBADMSG);
	256
	257	if (prot->version != TLS_1_3_VERSION &&
	258	prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
	259	tls_bigint_increment(ctx->iv + prot->salt_size,
	260	prot->iv_size);
	261	}
	262
	263	static inline void
	264	tls_xor_iv_with_seq(struct tls_prot_info prot, char iv, char *seq)
	265	{
	266	int i;
267
268	if (prot->version == TLS_1_3_VERSION \|\|
269	prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
270	for (i = 0; i < 8; i++)
271	iv[i + 4] ^= seq[i];
272	}
273	}
274
275	static inline void
276	tls_fill_prepend(struct tls_context ctx, char buf, size_t plaintext_len,
277	unsigned char record_type)
278	{
279	struct tls_prot_info *prot = &ctx->prot_info;
280	size_t pkt_len, iv_size = prot->iv_size;
281
282	pkt_len = plaintext_len + prot->tag_size;
283	if (prot->version != TLS_1_3_VERSION &&
284	prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
285	pkt_len += iv_size;
286
287	memcpy(buf + TLS_NONCE_OFFSET,
288	ctx->tx.iv + prot->salt_size, iv_size);
289	}
290
291	/* we cover nonce explicit here as well, so buf should be of
292	* size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
293	*/
294	buf[0] = prot->version == TLS_1_3_VERSION ?
295	TLS_RECORD_TYPE_DATA : record_type;
296	/* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
297	buf[1] = TLS_1_2_VERSION_MINOR;
298	buf[2] = TLS_1_2_VERSION_MAJOR;
299	/* we can use IV for nonce explicit according to spec */
300	buf[3] = pkt_len >> 8;
301	buf[4] = pkt_len & 0xFF;
302	}
303
304	static inline
305	void tls_make_aad(char buf, size_t size, char record_sequence,
306	unsigned char record_type, struct tls_prot_info *prot)
307	{
308	if (prot->version != TLS_1_3_VERSION) {
309	memcpy(buf, record_sequence, prot->rec_seq_size);
310	buf += 8;
311	} else {
312	size += prot->tag_size;
313	}
314
315	buf[0] = prot->version == TLS_1_3_VERSION ?
316	TLS_RECORD_TYPE_DATA : record_type;
317	buf[1] = TLS_1_2_VERSION_MAJOR;
318	buf[2] = TLS_1_2_VERSION_MINOR;
319	buf[3] = size >> 8;
320	buf[4] = size & 0xFF;
321	}
322
323	#endif