net/tls: Split conf to rx + tx

In TLS inline crypto, we can have one direction in software
and another in hardware. Thus, we split the TLS configuration to separate
structures for receive and transmit.

Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 79 insertions, 59 deletions

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 6ed1c02cfc94..5c3909c311f1 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -52,7 +52,7 @@ static int tls_do_decryption(struct sock *sk,
 			     gfp_t flags)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct strp_msg *rxm = strp_msg(skb);
 	struct aead_request *aead_req;
 
@@ -122,7 +122,7 @@ out:
 static void trim_both_sgl(struct sock *sk, int target_size)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 
 	trim_sg(sk, ctx->sg_plaintext_data,
 		&ctx->sg_plaintext_num_elem,
@@ -141,7 +141,7 @@ static void trim_both_sgl(struct sock *sk, int target_size)
 static int alloc_encrypted_sg(struct sock *sk, int len)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	int rc = 0;
 
 	rc = sk_alloc_sg(sk, len,
@@ -155,7 +155,7 @@ static int alloc_encrypted_sg(struct sock *sk, int len)
 static int alloc_plaintext_sg(struct sock *sk, int len)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	int rc = 0;
 
 	rc = sk_alloc_sg(sk, len, ctx->sg_plaintext_data, 0,
@@ -181,7 +181,7 @@ static void free_sg(struct sock *sk, struct scatterlist *sg,
 static void tls_free_both_sg(struct sock *sk)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 
 	free_sg(sk, ctx->sg_encrypted_data, &ctx->sg_encrypted_num_elem,
 		&ctx->sg_encrypted_size);
@@ -191,7 +191,7 @@ static void tls_free_both_sg(struct sock *sk)
 }
 
 static int tls_do_encryption(struct tls_context *tls_ctx,
-			     struct tls_sw_context *ctx, size_t data_len,
+			     struct tls_sw_context_tx *ctx, size_t data_len,
 			     gfp_t flags)
 {
 	unsigned int req_size = sizeof(struct aead_request) +
@@ -227,7 +227,7 @@ static int tls_push_record(struct sock *sk, int flags,
 			   unsigned char record_type)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	int rc;
 
 	sg_mark_end(ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem - 1);
@@ -339,7 +339,7 @@ static int memcopy_from_iter(struct sock *sk, struct iov_iter *from,
 			     int bytes)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	struct scatterlist *sg = ctx->sg_plaintext_data;
 	int copy, i, rc = 0;
 
@@ -367,7 +367,7 @@ out:
 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	int ret = 0;
 	int required_size;
 	long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
@@ -522,7 +522,7 @@ int tls_sw_sendpage(struct sock *sk, struct page *page,
 		    int offset, size_t size, int flags)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 	int ret = 0;
 	long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
 	bool eor;
@@ -636,7 +636,7 @@ static struct sk_buff *tls_wait_data(struct sock *sk, int flags,
 				     long timeo, int *err)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct sk_buff *skb;
 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 
@@ -674,7 +674,7 @@ static int decrypt_skb(struct sock *sk, struct sk_buff *skb,
 		       struct scatterlist *sgout)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + MAX_IV_SIZE];
 	struct scatterlist sgin_arr[MAX_SKB_FRAGS + 2];
 	struct scatterlist *sgin = &sgin_arr[0];
@@ -723,7 +723,7 @@ static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb,
 			       unsigned int len)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct strp_msg *rxm = strp_msg(skb);
 
 	if (len < rxm->full_len) {
@@ -749,7 +749,7 @@ int tls_sw_recvmsg(struct sock *sk,
 		   int *addr_len)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	unsigned char control;
 	struct strp_msg *rxm;
 	struct sk_buff *skb;
@@ -869,7 +869,7 @@ ssize_t tls_sw_splice_read(struct socket *sock,  loff_t *ppos,
 			   size_t len, unsigned int flags)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct strp_msg *rxm = NULL;
 	struct sock *sk = sock->sk;
 	struct sk_buff *skb;
@@ -922,7 +922,7 @@ unsigned int tls_sw_poll(struct file *file, struct socket *sock,
 	unsigned int ret;
 	struct sock *sk = sock->sk;
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 
 	/* Grab POLLOUT and POLLHUP from the underlying socket */
 	ret = ctx->sk_poll(file, sock, wait);
@@ -938,7 +938,7 @@ unsigned int tls_sw_poll(struct file *file, struct socket *sock,
 static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	char header[tls_ctx->rx.prepend_size];
 	struct strp_msg *rxm = strp_msg(skb);
 	size_t cipher_overhead;
@@ -987,7 +987,7 @@ read_failure:
 static void tls_queue(struct strparser *strp, struct sk_buff *skb)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct strp_msg *rxm;
 
 	rxm = strp_msg(skb);
@@ -1003,18 +1003,28 @@ static void tls_queue(struct strparser *strp, struct sk_buff *skb)
 static void tls_data_ready(struct sock *sk)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 
 	strp_data_ready(&ctx->strp);
 }
 
-void tls_sw_free_resources(struct sock *sk)
+void tls_sw_free_resources_tx(struct sock *sk)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
-	struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx);
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 
 	if (ctx->aead_send)
 		crypto_free_aead(ctx->aead_send);
+	tls_free_both_sg(sk);
+
+	kfree(ctx);
+}
+
+void tls_sw_free_resources_rx(struct sock *sk)
+{
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
+
 	if (ctx->aead_recv) {
 		if (ctx->recv_pkt) {
 			kfree_skb(ctx->recv_pkt);
@@ -1030,10 +1040,7 @@ void tls_sw_free_resources(struct sock *sk)
 		lock_sock(sk);
 	}
 
-	tls_free_both_sg(sk);
-
 	kfree(ctx);
-	kfree(tls_ctx);
 }
 
 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
@@ -1041,7 +1048,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 	char keyval[TLS_CIPHER_AES_GCM_128_KEY_SIZE];
 	struct tls_crypto_info *crypto_info;
 	struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
-	struct tls_sw_context *sw_ctx;
+	struct tls_sw_context_tx *sw_ctx_tx = NULL;
+	struct tls_sw_context_rx *sw_ctx_rx = NULL;
 	struct cipher_context *cctx;
 	struct crypto_aead **aead;
 	struct strp_callbacks cb;
@@ -1054,27 +1062,32 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		goto out;
 	}
 
-	if (!ctx->priv_ctx) {
-		sw_ctx = kzalloc(sizeof(*sw_ctx), GFP_KERNEL);
-		if (!sw_ctx) {
+	if (tx) {
+		sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
+		if (!sw_ctx_tx) {
 			rc = -ENOMEM;
 			goto out;
 		}
-		crypto_init_wait(&sw_ctx->async_wait);
+		crypto_init_wait(&sw_ctx_tx->async_wait);
+		ctx->priv_ctx_tx = sw_ctx_tx;
 	} else {
-		sw_ctx = ctx->priv_ctx;
+		sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
+		if (!sw_ctx_rx) {
+			rc = -ENOMEM;
+			goto out;
+		}
+		crypto_init_wait(&sw_ctx_rx->async_wait);
+		ctx->priv_ctx_rx = sw_ctx_rx;
 	}
 
-	ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;
-
 	if (tx) {
 		crypto_info = &ctx->crypto_send;
 		cctx = &ctx->tx;
-		aead = &sw_ctx->aead_send;
+		aead = &sw_ctx_tx->aead_send;
 	} else {
 		crypto_info = &ctx->crypto_recv;
 		cctx = &ctx->rx;
-		aead = &sw_ctx->aead_recv;
+		aead = &sw_ctx_rx->aead_recv;
 	}
 
 	switch (crypto_info->cipher_type) {
@@ -1121,22 +1134,24 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 	}
 	memcpy(cctx->rec_seq, rec_seq, rec_seq_size);
 
-	if (tx) {
-		sg_init_table(sw_ctx->sg_encrypted_data,
-			      ARRAY_SIZE(sw_ctx->sg_encrypted_data));
-		sg_init_table(sw_ctx->sg_plaintext_data,
-			      ARRAY_SIZE(sw_ctx->sg_plaintext_data));
-
-		sg_init_table(sw_ctx->sg_aead_in, 2);
-		sg_set_buf(&sw_ctx->sg_aead_in[0], sw_ctx->aad_space,
-			   sizeof(sw_ctx->aad_space));
-		sg_unmark_end(&sw_ctx->sg_aead_in[1]);
-		sg_chain(sw_ctx->sg_aead_in, 2, sw_ctx->sg_plaintext_data);
-		sg_init_table(sw_ctx->sg_aead_out, 2);
-		sg_set_buf(&sw_ctx->sg_aead_out[0], sw_ctx->aad_space,
-			   sizeof(sw_ctx->aad_space));
-		sg_unmark_end(&sw_ctx->sg_aead_out[1]);
-		sg_chain(sw_ctx->sg_aead_out, 2, sw_ctx->sg_encrypted_data);
+	if (sw_ctx_tx) {
+		sg_init_table(sw_ctx_tx->sg_encrypted_data,
+			      ARRAY_SIZE(sw_ctx_tx->sg_encrypted_data));
+		sg_init_table(sw_ctx_tx->sg_plaintext_data,
+			      ARRAY_SIZE(sw_ctx_tx->sg_plaintext_data));
+
+		sg_init_table(sw_ctx_tx->sg_aead_in, 2);
+		sg_set_buf(&sw_ctx_tx->sg_aead_in[0], sw_ctx_tx->aad_space,
+			   sizeof(sw_ctx_tx->aad_space));
+		sg_unmark_end(&sw_ctx_tx->sg_aead_in[1]);
+		sg_chain(sw_ctx_tx->sg_aead_in, 2,
+			 sw_ctx_tx->sg_plaintext_data);
+		sg_init_table(sw_ctx_tx->sg_aead_out, 2);
+		sg_set_buf(&sw_ctx_tx->sg_aead_out[0], sw_ctx_tx->aad_space,
+			   sizeof(sw_ctx_tx->aad_space));
+		sg_unmark_end(&sw_ctx_tx->sg_aead_out[1]);
+		sg_chain(sw_ctx_tx->sg_aead_out, 2,
+			 sw_ctx_tx->sg_encrypted_data);
 	}
 
 	if (!*aead) {
@@ -1161,22 +1176,22 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 	if (rc)
 		goto free_aead;
 
-	if (!tx) {
+	if (sw_ctx_rx) {
 		/* Set up strparser */
 		memset(&cb, 0, sizeof(cb));
 		cb.rcv_msg = tls_queue;
 		cb.parse_msg = tls_read_size;
 
-		strp_init(&sw_ctx->strp, sk, &cb);
+		strp_init(&sw_ctx_rx->strp, sk, &cb);
 
 		write_lock_bh(&sk->sk_callback_lock);
-		sw_ctx->saved_data_ready = sk->sk_data_ready;
+		sw_ctx_rx->saved_data_ready = sk->sk_data_ready;
 		sk->sk_data_ready = tls_data_ready;
 		write_unlock_bh(&sk->sk_callback_lock);
 
-		sw_ctx->sk_poll = sk->sk_socket->ops->poll;
+		sw_ctx_rx->sk_poll = sk->sk_socket->ops->poll;
 
-		strp_check_rcv(&sw_ctx->strp);
+		strp_check_rcv(&sw_ctx_rx->strp);
 	}
 
 	goto out;
@@ -1188,11 +1203,16 @@ free_rec_seq:
 	kfree(cctx->rec_seq);
 	cctx->rec_seq = NULL;
 free_iv:
-	kfree(ctx->tx.iv);
-	ctx->tx.iv = NULL;
+	kfree(cctx->iv);
+	cctx->iv = NULL;
 free_priv:
-	kfree(ctx->priv_ctx);
-	ctx->priv_ctx = NULL;
+	if (tx) {
+		kfree(ctx->priv_ctx_tx);
+		ctx->priv_ctx_tx = NULL;
+	} else {
+		kfree(ctx->priv_ctx_rx);
+		ctx->priv_ctx_rx = NULL;
+	}
 out:
 	return rc;
 }