Merge branch 'tls-pad-strparser-internal-header-decrypt_ctx-etc'

Jakub Kicinski says:

====================
tls: pad strparser, internal header, decrypt_ctx etc.

A grab bag of non-functional refactoring to make the series
which will let us decrypt into a fresh skb smaller.

Patches in this series are not strictly required to get the
decryption into a fresh skb going, they are more in the "things
which had been annoying me for a while" category.
====================

Link: https://lore.kernel.org/r/20220708010314.1451462-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/strparser.h

@@ -65,15 +65,19 @@ struct _strp_msg {
 struct sk_skb_cb {
 #define SK_SKB_CB_PRIV_LEN 20
 	unsigned char data[SK_SKB_CB_PRIV_LEN];
+	/* align strp on cache line boundary within skb->cb[] */
+	unsigned char pad[4];
 	struct _strp_msg strp;
-	/* temp_reg is a temporary register used for bpf_convert_data_end_access
-	 * when dst_reg == src_reg.
-	 */
-	u64 temp_reg;
+
+	/* strp users' data follows */
 	struct tls_msg {
 		u8 control;
 		u8 decrypted;
 	} tls;
+	/* temp_reg is a temporary register used for bpf_convert_data_end_access
+	 * when dst_reg == src_reg.
+	 */
+	u64 temp_reg;
 };
 
 static inline struct strp_msg *strp_msg(struct sk_buff *skb)

include/net/tls.h

@@ -39,7 +39,6 @@
 #include <linux/crypto.h>
 #include <linux/socket.h>
 #include <linux/tcp.h>
-#include <linux/skmsg.h>
 #include <linux/mutex.h>
 #include <linux/netdevice.h>
 #include <linux/rcupdate.h>
@@ -50,6 +49,7 @@
 #include <crypto/aead.h>
 #include <uapi/linux/tls.h>
 
+struct tls_rec;
 
 /* Maximum data size carried in a TLS record */
 #define TLS_MAX_PAYLOAD_SIZE		((size_t)1 << 14)
@@ -66,6 +66,7 @@
 #define MAX_IV_SIZE			16
 #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.
  *
@@ -77,13 +78,6 @@
 #define TLS_AES_CCM_IV_B0_BYTE		2
 #define TLS_SM4_CCM_IV_B0_BYTE		2
 
-#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)
-
 enum {
 	TLS_BASE,
 	TLS_SW,
@@ -92,32 +86,6 @@ enum {
 	TLS_NUM_CONFIG,
 };
 
-/* 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;
-
-	char aad_space[TLS_AAD_SPACE_SIZE];
-	u8 iv_data[MAX_IV_SIZE];
-	struct aead_request aead_req;
-	u8 aead_req_ctx[];
-};
-
 struct tx_work {
 	struct delayed_work work;
 	struct sock *sk;
@@ -348,44 +316,6 @@ struct tls_offload_context_rx {
 #define TLS_OFFLOAD_CONTEXT_SIZE_RX					\
 	(sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX)
 
-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);
-
 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
 				       u32 seq, u64 *p_record_sn);
 
@@ -399,58 +329,6 @@ static inline u32 tls_record_start_seq(struct tls_record_info *rec)
 	return rec->end_seq - rec->len;
 }
 
-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 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 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 is_tx_ready(struct tls_sw_context_tx *ctx)
-{
-	struct tls_rec *rec;
-
-	rec = list_first_entry(&ctx->tx_list, struct tls_rec, list);
-	if (!rec)
-		return false;
-
-	return READ_ONCE(rec->tx_ready);
-}
-
-static inline u16 tls_user_config(struct tls_context *ctx, bool tx)
-{
-	u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
-
-	switch (config) {
-	case TLS_BASE:
-		return TLS_CONF_BASE;
-	case TLS_SW:
-		return TLS_CONF_SW;
-	case TLS_HW:
-		return TLS_CONF_HW;
-	case TLS_HW_RECORD:
-		return TLS_CONF_HW_RECORD;
-	}
-	return 0;
-}
-
 struct sk_buff *
 tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
 		      struct sk_buff *skb);
@@ -469,31 +347,6 @@ static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
 #endif
 }
 
-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 struct tls_context *tls_get_ctx(const struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -504,82 +357,6 @@ static inline struct tls_context *tls_get_ctx(const struct sock *sk)
 	return (__force void *)icsk->icsk_ulp_data;
 }
 
-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_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;
-}
-
-static inline void 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 struct tls_sw_context_rx *tls_sw_ctx_rx(
 		const struct tls_context *tls_ctx)
 {
@@ -616,9 +393,6 @@ static inline bool tls_sw_has_ctx_rx(const struct sock *sk)
 	return !!tls_sw_ctx_rx(ctx);
 }
 
-void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
-void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
-
 static inline struct tls_offload_context_rx *
 tls_offload_ctx_rx(const struct tls_context *tls_ctx)
 {
@@ -693,31 +467,11 @@ static inline bool tls_offload_tx_resync_pending(struct sock *sk)
 	return ret;
 }
 
-int __net_init tls_proc_init(struct net *net);
-void __net_exit tls_proc_fini(struct net *net);
-
-int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
-		      unsigned char *record_type);
-int decrypt_skb(struct sock *sk, struct sk_buff *skb,
-		struct scatterlist *sgout);
 struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
 
-int tls_sw_fallback_init(struct sock *sk,
-			 struct tls_offload_context_tx *offload_ctx,
-			 struct tls_crypto_info *crypto_info);
-
 #ifdef CONFIG_TLS_DEVICE
-void tls_device_init(void);
-void tls_device_cleanup(void);
 void tls_device_sk_destruct(struct sock *sk);
-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);
 void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq);
-int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
-			 struct sk_buff *skb, struct strp_msg *rxm);
 
 static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk)
 {
@@ -726,33 +480,5 @@ static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk)
 		return false;
 	return tls_get_ctx(sk)->rx_conf == TLS_HW;
 }
-#else
-static inline void tls_device_init(void) {}
-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,
-		     struct sk_buff *skb, struct strp_msg *rxm)
-{
-	return 0;
-}
 #endif
 #endif /* _TLS_OFFLOAD_H */

net/strparser/strparser.c

@@ -533,6 +533,9 @@ EXPORT_SYMBOL_GPL(strp_check_rcv);
 
 static int __init strp_dev_init(void)
 {
+	BUILD_BUG_ON(sizeof(struct sk_skb_cb) >
+		     sizeof_field(struct sk_buff, cb));
+
 	strp_wq = create_singlethread_workqueue("kstrp");
 	if (unlikely(!strp_wq))
 		return -ENOMEM;

net/tls/tls.h

+/*
+ * 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_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;
+
+	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 sk_buff *skb,
+		struct scatterlist *sgout);
+
+int tls_sw_fallback_init(struct sock *sk,
+			 struct tls_offload_context_tx *offload_ctx,
+			 struct tls_crypto_info *crypto_info);
+
+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;
+}
+
+#ifdef CONFIG_TLS_DEVICE
+void 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,
+			 struct sk_buff *skb, struct strp_msg *rxm);
+#else
+static inline void tls_device_init(void) {}
+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,
+		     struct sk_buff *skb, struct strp_msg *rxm)
+{
+	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

net/tls/tls_device.c

@@ -38,6 +38,7 @@
 #include <net/tcp.h>
 #include <net/tls.h>
 
+#include "tls.h"
 #include "trace.h"
 
 /* device_offload_lock is used to synchronize tls_dev_add
@@ -562,7 +563,7 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	lock_sock(sk);
 
 	if (unlikely(msg->msg_controllen)) {
-		rc = tls_proccess_cmsg(sk, msg, &record_type);
+		rc = tls_process_cmsg(sk, msg, &record_type);
 		if (rc)
 			goto out;
 	}

net/tls/tls_device_fallback.c

@@ -34,6 +34,8 @@
 #include <crypto/scatterwalk.h>
 #include <net/ip6_checksum.h>
 
+#include "tls.h"
+
 static void chain_to_walk(struct scatterlist *sg, struct scatter_walk *walk)
 {
 	struct scatterlist *src = walk->sg;

net/tls/tls_main.c

@@ -45,6 +45,8 @@
 #include <net/tls.h>
 #include <net/tls_toe.h>
 
+#include "tls.h"
+
 MODULE_AUTHOR("Mellanox Technologies");
 MODULE_DESCRIPTION("Transport Layer Security Support");
 MODULE_LICENSE("Dual BSD/GPL");
@@ -164,8 +166,8 @@ static int tls_handle_open_record(struct sock *sk, int flags)
 	return 0;
 }
 
-int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
-		      unsigned char *record_type)
+int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
+		     unsigned char *record_type)
 {
 	struct cmsghdr *cmsg;
 	int rc = -EINVAL;
@@ -1003,6 +1005,23 @@ static void tls_update(struct sock *sk, struct proto *p,
 	}
 }
 
+static u16 tls_user_config(struct tls_context *ctx, bool tx)
+{
+	u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
+
+	switch (config) {
+	case TLS_BASE:
+		return TLS_CONF_BASE;
+	case TLS_SW:
+		return TLS_CONF_SW;
+	case TLS_HW:
+		return TLS_CONF_HW;
+	case TLS_HW_RECORD:
+		return TLS_CONF_HW_RECORD;
+	}
+	return 0;
+}
+
 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 {
 	u16 version, cipher_type;

net/tls/tls_proc.c

@@ -6,6 +6,8 @@
 #include <net/snmp.h>
 #include <net/tls.h>
 
+#include "tls.h"
+
 #ifdef CONFIG_PROC_FS
 static const struct snmp_mib tls_mib_list[] = {
 	SNMP_MIB_ITEM("TlsCurrTxSw", LINUX_MIB_TLSCURRTXSW),

net/tls/tls_sw.c

@@ -44,12 +44,21 @@
 #include <net/strparser.h>
 #include <net/tls.h>
 
+#include "tls.h"
+
 struct tls_decrypt_arg {
 	bool zc;
 	bool async;
 	u8 tail;
 };
 
+struct tls_decrypt_ctx {
+	u8 iv[MAX_IV_SIZE];
+	u8 aad[TLS_MAX_AAD_SIZE];
+	u8 tail;
+	struct scatterlist sg[];
+};
+
 noinline void tls_err_abort(struct sock *sk, int err)
 {
 	WARN_ON_ONCE(err >= 0);
@@ -517,7 +526,8 @@ static int tls_do_encryption(struct sock *sk,
 	memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
 	       prot->iv_size + prot->salt_size);
 
-	xor_iv_with_seq(prot, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq);
+	tls_xor_iv_with_seq(prot, rec->iv_data + iv_offset,
+			    tls_ctx->tx.rec_seq);
 
 	sge->offset += prot->prepend_size;
 	sge->length -= prot->prepend_size;
@@ -954,7 +964,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	lock_sock(sk);
 
 	if (unlikely(msg->msg_controllen)) {
-		ret = tls_proccess_cmsg(sk, msg, &record_type);
+		ret = tls_process_cmsg(sk, msg, &record_type);
 		if (ret) {
 			if (ret == -EINPROGRESS)
 				num_async++;
@@ -1292,54 +1302,50 @@ int tls_sw_sendpage(struct sock *sk, struct page *page,
 	return ret;
 }
 
-static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock,
-				     bool nonblock, long timeo, int *err)
+static int
+tls_rx_rec_wait(struct sock *sk, struct sk_psock *psock, bool nonblock,
+		long timeo)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
-	struct sk_buff *skb;
 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 
-	while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) {
-		if (sk->sk_err) {
-			*err = sock_error(sk);
-			return NULL;
-		}
+	while (!ctx->recv_pkt) {
+		if (!sk_psock_queue_empty(psock))
+			return 0;
+
+		if (sk->sk_err)
+			return sock_error(sk);
 
 		if (!skb_queue_empty(&sk->sk_receive_queue)) {
 			__strp_unpause(&ctx->strp);
 			if (ctx->recv_pkt)
-				return ctx->recv_pkt;
+				break;
 		}
 
 		if (sk->sk_shutdown & RCV_SHUTDOWN)
-			return NULL;
+			return 0;
 
 		if (sock_flag(sk, SOCK_DONE))
-			return NULL;
+			return 0;
 
-		if (nonblock || !timeo) {
-			*err = -EAGAIN;
-			return NULL;
-		}
+		if (nonblock || !timeo)
+			return -EAGAIN;
 
 		add_wait_queue(sk_sleep(sk), &wait);
 		sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
 		sk_wait_event(sk, &timeo,
-			      ctx->recv_pkt != skb ||
-			      !sk_psock_queue_empty(psock),
+			      ctx->recv_pkt || !sk_psock_queue_empty(psock),
 			      &wait);
 		sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
 		remove_wait_queue(sk_sleep(sk), &wait);
 
 		/* Handle signals */
-		if (signal_pending(current)) {
-			*err = sock_intr_errno(timeo);
-			return NULL;
-		}
+		if (signal_pending(current))
+			return sock_intr_errno(timeo);
 	}
 
-	return skb;
+	return 1;
 }
 
 static int tls_setup_from_iter(struct iov_iter *from,
@@ -1414,17 +1420,18 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct tls_prot_info *prot = &tls_ctx->prot_info;
+	int n_sgin, n_sgout, aead_size, err, pages = 0;
 	struct strp_msg *rxm = strp_msg(skb);
 	struct tls_msg *tlm = tls_msg(skb);
-	int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0;
-	u8 *aad, *iv, *tail, *mem = NULL;
 	struct aead_request *aead_req;
 	struct sk_buff *unused;
 	struct scatterlist *sgin = NULL;
 	struct scatterlist *sgout = NULL;
 	const int data_len = rxm->full_len - prot->overhead_size;
 	int tail_pages = !!prot->tail_size;
+	struct tls_decrypt_ctx *dctx;
 	int iv_offset = 0;
+	u8 *mem;
 
 	if (darg->zc && (out_iov || out_sg)) {
 		if (out_iov)
@@ -1446,38 +1453,30 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	/* Increment to accommodate AAD */
 	n_sgin = n_sgin + 1;
 
-	nsg = n_sgin + n_sgout;
-
-	aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
-	mem_size = aead_size + (nsg * sizeof(struct scatterlist));
-	mem_size = mem_size + prot->aad_size;
-	mem_size = mem_size + MAX_IV_SIZE;
-	mem_size = mem_size + prot->tail_size;
-
 	/* Allocate a single block of memory which contains
-	 * aead_req || sgin[] || sgout[] || aad || iv || tail.
-	 * This order achieves correct alignment for aead_req, sgin, sgout.
+	 *   aead_req || tls_decrypt_ctx.
+	 * Both structs are variable length.
 	 */
-	mem = kmalloc(mem_size, sk->sk_allocation);
+	aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
+	mem = kmalloc(aead_size + struct_size(dctx, sg, n_sgin + n_sgout),
+		      sk->sk_allocation);
 	if (!mem)
 		return -ENOMEM;
 
 	/* Segment the allocated memory */
 	aead_req = (struct aead_request *)mem;
-	sgin = (struct scatterlist *)(mem + aead_size);
-	sgout = sgin + n_sgin;
-	aad = (u8 *)(sgout + n_sgout);
-	iv = aad + prot->aad_size;
-	tail = iv + MAX_IV_SIZE;
+	dctx = (struct tls_decrypt_ctx *)(mem + aead_size);
+	sgin = &dctx->sg[0];
+	sgout = &dctx->sg[n_sgin];
 
 	/* For CCM based ciphers, first byte of nonce+iv is a constant */
 	switch (prot->cipher_type) {
 	case TLS_CIPHER_AES_CCM_128:
-		iv[0] = TLS_AES_CCM_IV_B0_BYTE;
+		dctx->iv[0] = TLS_AES_CCM_IV_B0_BYTE;
 		iv_offset = 1;
 		break;
 	case TLS_CIPHER_SM4_CCM:
-		iv[0] = TLS_SM4_CCM_IV_B0_BYTE;
+		dctx->iv[0] = TLS_SM4_CCM_IV_B0_BYTE;
 		iv_offset = 1;
 		break;
 	}
@@ -1485,40 +1484,36 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	/* Prepare IV */
 	if (prot->version == TLS_1_3_VERSION ||
 	    prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
-		memcpy(iv + iv_offset, tls_ctx->rx.iv,
+		memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv,
 		       prot->iv_size + prot->salt_size);
 	} else {
 		err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
-				    iv + iv_offset + prot->salt_size,
+				    &dctx->iv[iv_offset] + prot->salt_size,
 				    prot->iv_size);
-		if (err < 0) {
-			kfree(mem);
-			return err;
-		}
-		memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
+		if (err < 0)
+			goto exit_free;
+		memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv, prot->salt_size);
 	}
-	xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
+	tls_xor_iv_with_seq(prot, &dctx->iv[iv_offset], tls_ctx->rx.rec_seq);
 
 	/* Prepare AAD */
-	tls_make_aad(aad, rxm->full_len - prot->overhead_size +
+	tls_make_aad(dctx->aad, rxm->full_len - prot->overhead_size +
 		     prot->tail_size,
 		     tls_ctx->rx.rec_seq, tlm->control, prot);
 
 	/* Prepare sgin */
 	sg_init_table(sgin, n_sgin);
-	sg_set_buf(&sgin[0], aad, prot->aad_size);
+	sg_set_buf(&sgin[0], dctx->aad, prot->aad_size);
 	err = skb_to_sgvec(skb, &sgin[1],
 			   rxm->offset + prot->prepend_size,
 			   rxm->full_len - prot->prepend_size);
-	if (err < 0) {
-		kfree(mem);
-		return err;
-	}
+	if (err < 0)
+		goto exit_free;
 
 	if (n_sgout) {
 		if (out_iov) {
 			sg_init_table(sgout, n_sgout);
-			sg_set_buf(&sgout[0], aad, prot->aad_size);
+			sg_set_buf(&sgout[0], dctx->aad, prot->aad_size);
 
 			err = tls_setup_from_iter(out_iov, data_len,
 						  &pages, &sgout[1],
@@ -1528,7 +1523,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 
 			if (prot->tail_size) {
 				sg_unmark_end(&sgout[pages]);
-				sg_set_buf(&sgout[pages + 1], tail,
+				sg_set_buf(&sgout[pages + 1], &dctx->tail,
 					   prot->tail_size);
 				sg_mark_end(&sgout[pages + 1]);
 			}
@@ -1545,18 +1540,18 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	}
 
 	/* Prepare and submit AEAD request */
-	err = tls_do_decryption(sk, skb, sgin, sgout, iv,
+	err = tls_do_decryption(sk, skb, sgin, sgout, dctx->iv,
 				data_len + prot->tail_size, aead_req, darg);
 	if (darg->async)
 		return 0;
 
 	if (prot->tail_size)
-		darg->tail = *tail;
+		darg->tail = dctx->tail;
 
 	/* Release the pages in case iov was mapped to pages */
 	for (; pages > 0; pages--)
 		put_page(sg_page(&sgout[pages]));
-
+exit_free:
 	kfree(mem);
 	return err;
 }
@@ -1813,8 +1808,8 @@ int tls_sw_recvmsg(struct sock *sk,
 		struct tls_decrypt_arg darg = {};
 		int to_decrypt, chunk;
 
-		skb = tls_wait_data(sk, psock, flags & MSG_DONTWAIT, timeo, &err);
-		if (!skb) {
+		err = tls_rx_rec_wait(sk, psock, flags & MSG_DONTWAIT, timeo);
+		if (err <= 0) {
 			if (psock) {
 				chunk = sk_msg_recvmsg(sk, psock, msg, len,
 						       flags);
@@ -1824,6 +1819,7 @@ int tls_sw_recvmsg(struct sock *sk,
 			goto recv_end;
 		}
 
+		skb = ctx->recv_pkt;
 		rxm = strp_msg(skb);
 		tlm = tls_msg(skb);
 
@@ -1990,11 +1986,13 @@ ssize_t tls_sw_splice_read(struct socket *sock,  loff_t *ppos,
 	} else {
 		struct tls_decrypt_arg darg = {};
 
-		skb = tls_wait_data(sk, NULL, flags & SPLICE_F_NONBLOCK, timeo,
-				    &err);
-		if (!skb)
+		err = tls_rx_rec_wait(sk, NULL, flags & SPLICE_F_NONBLOCK,
+				      timeo);
+		if (err <= 0)
 			goto splice_read_end;
 
+		skb = ctx->recv_pkt;
+
 		err = decrypt_skb_update(sk, skb, NULL, &darg);
 		if (err < 0) {
 			tls_err_abort(sk, -EBADMSG);
@@ -2271,12 +2269,23 @@ static void tx_work_handler(struct work_struct *work)
 	mutex_unlock(&tls_ctx->tx_lock);
 }
 
+static bool tls_is_tx_ready(struct tls_sw_context_tx *ctx)
+{
+	struct tls_rec *rec;
+
+	rec = list_first_entry(&ctx->tx_list, struct tls_rec, list);
+	if (!rec)
+		return false;
+
+	return READ_ONCE(rec->tx_ready);
+}
+
 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)
 {
 	struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
 
 	/* Schedule the transmission if tx list is ready */
-	if (is_tx_ready(tx_ctx) &&
+	if (tls_is_tx_ready(tx_ctx) &&
 	    !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
 		schedule_delayed_work(&tx_ctx->tx_work.work, 0);
 }
@@ -2474,13 +2483,6 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		goto free_priv;
 	}
 
-	/* Sanity-check the sizes for stack allocations. */
-	if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
-	    rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE) {
-		rc = -EINVAL;
-		goto free_priv;
-	}
-
 	if (crypto_info->version == TLS_1_3_VERSION) {
 		nonce_size = 0;
 		prot->aad_size = TLS_HEADER_SIZE;
@@ -2490,6 +2492,14 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		prot->tail_size = 0;
 	}
 
+	/* Sanity-check the sizes for stack allocations. */
+	if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
+	    rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE ||
+	    prot->aad_size > TLS_MAX_AAD_SIZE) {
+		rc = -EINVAL;
+		goto free_priv;
+	}
+
 	prot->version = crypto_info->version;
 	prot->cipher_type = crypto_info->cipher_type;
 	prot->prepend_size = TLS_HEADER_SIZE + nonce_size;

net/tls/tls_toe.c

@@ -38,6 +38,8 @@
 #include <net/tls.h>
 #include <net/tls_toe.h>
 
+#include "tls.h"
+
 static LIST_HEAD(device_list);
 static DEFINE_SPINLOCK(device_spinlock);