net/tls: remove sock unlock/lock around strp_done()

The tls close() callback currently drops the sock lock to call
strp_done(). Split up the RX cleanup into stopping the strparser
and releasing most resources, syncing strparser and finally
freeing the context.

To avoid the need for a strp_done() call on the cleanup path
of device offload make sure we don't arm the strparser until
we are sure init will be successful.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

3 files changed, 60 insertions, 42 deletions

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 4d67d72f007c8..7c0b2b778703f 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -1045,7 +1045,6 @@ int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
 	rc = tls_set_sw_offload(sk, ctx, 0);
 	if (rc)
 		goto release_ctx;
-	tls_sw_strparser_arm(sk, ctx);
 
 	rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
 					     &ctx->crypto_recv.info,
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 5c29b410cf7d1..d152a00a7a27f 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -261,24 +261,9 @@ void tls_ctx_free(struct tls_context *ctx)
 	kfree(ctx);
 }
 
-static void tls_sk_proto_close(struct sock *sk, long timeout)
+static void tls_sk_proto_cleanup(struct sock *sk,
+				 struct tls_context *ctx, long timeo)
 {
-	struct tls_context *ctx = tls_get_ctx(sk);
-	long timeo = sock_sndtimeo(sk, 0);
-	void (*sk_proto_close)(struct sock *sk, long timeout);
-	bool free_ctx = false;
-
-	if (ctx->tx_conf == TLS_SW)
-		tls_sw_cancel_work_tx(ctx);
-
-	lock_sock(sk);
-	sk_proto_close = ctx->sk_proto_close;
-
-	if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) {
-		free_ctx = true;
-		goto skip_tx_cleanup;
-	}
-
 	if (unlikely(sk->sk_write_pending) &&
 	    !wait_on_pending_writer(sk, &timeo))
 		tls_handle_open_record(sk, 0);
@@ -287,7 +272,7 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
 	if (ctx->tx_conf == TLS_SW) {
 		kfree(ctx->tx.rec_seq);
 		kfree(ctx->tx.iv);
-		tls_sw_free_resources_tx(sk);
+		tls_sw_release_resources_tx(sk);
 #ifdef CONFIG_TLS_DEVICE
 	} else if (ctx->tx_conf == TLS_HW) {
 		tls_device_free_resources_tx(sk);
@@ -295,26 +280,40 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
 	}
 
 	if (ctx->rx_conf == TLS_SW)
-		tls_sw_free_resources_rx(sk);
+		tls_sw_release_resources_rx(sk);
 
 #ifdef CONFIG_TLS_DEVICE
 	if (ctx->rx_conf == TLS_HW)
 		tls_device_offload_cleanup_rx(sk);
-
-	if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
-#else
-	{
 #endif
-		tls_ctx_free(ctx);
-		ctx = NULL;
-	}
+}
+
+static void tls_sk_proto_close(struct sock *sk, long timeout)
+{
+	void (*sk_proto_close)(struct sock *sk, long timeout);
+	struct tls_context *ctx = tls_get_ctx(sk);
+	long timeo = sock_sndtimeo(sk, 0);
+	bool free_ctx;
+
+	if (ctx->tx_conf == TLS_SW)
+		tls_sw_cancel_work_tx(ctx);
+
+	lock_sock(sk);
+	free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
+	sk_proto_close = ctx->sk_proto_close;
+
+	if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
+		tls_sk_proto_cleanup(sk, ctx, timeo);
 
-skip_tx_cleanup:
 	release_sock(sk);
+	if (ctx->tx_conf == TLS_SW)
+		tls_sw_free_ctx_tx(ctx);
+	if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
+		tls_sw_strparser_done(ctx);
+	if (ctx->rx_conf == TLS_SW)
+		tls_sw_free_ctx_rx(ctx);
 	sk_proto_close(sk, timeout);
-	/* free ctx for TLS_HW_RECORD, used by tcp_set_state
-	 * for sk->sk_prot->unhash [tls_hw_unhash]
-	 */
+
 	if (free_ctx)
 		tls_ctx_free(ctx);
 }
@@ -541,9 +540,9 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 			rc = tls_set_sw_offload(sk, ctx, 0);
 			if (rc)
 				goto err_crypto_info;
-			tls_sw_strparser_arm(sk, ctx);
 			conf = TLS_SW;
 		}
+		tls_sw_strparser_arm(sk, ctx);
 	}
 
 	if (tx)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 38c0e53c727d4..91d21b048a9b2 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -2063,7 +2063,7 @@ void tls_sw_cancel_work_tx(struct tls_context *tls_ctx)
 	cancel_delayed_work_sync(&ctx->tx_work.work);
 }
 
-void tls_sw_free_resources_tx(struct sock *sk)
+void tls_sw_release_resources_tx(struct sock *sk)
 {
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
@@ -2096,6 +2096,11 @@ void tls_sw_free_resources_tx(struct sock *sk)
 
 	crypto_free_aead(ctx->aead_send);
 	tls_free_open_rec(sk);
+}
+
+void tls_sw_free_ctx_tx(struct tls_context *tls_ctx)
+{
+	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 
 	kfree(ctx);
 }
@@ -2114,25 +2119,40 @@ void tls_sw_release_resources_rx(struct sock *sk)
 		skb_queue_purge(&ctx->rx_list);
 		crypto_free_aead(ctx->aead_recv);
 		strp_stop(&ctx->strp);
-		write_lock_bh(&sk->sk_callback_lock);
-		sk->sk_data_ready = ctx->saved_data_ready;
-		write_unlock_bh(&sk->sk_callback_lock);
-		release_sock(sk);
-		strp_done(&ctx->strp);
-		lock_sock(sk);
+		/* If tls_sw_strparser_arm() was not called (cleanup paths)
+		 * we still want to strp_stop(), but sk->sk_data_ready was
+		 * never swapped.
+		 */
+		if (ctx->saved_data_ready) {
+			write_lock_bh(&sk->sk_callback_lock);
+			sk->sk_data_ready = ctx->saved_data_ready;
+			write_unlock_bh(&sk->sk_callback_lock);
+		}
 	}
 }
 
-void tls_sw_free_resources_rx(struct sock *sk)
+void tls_sw_strparser_done(struct tls_context *tls_ctx)
 {
-	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 
-	tls_sw_release_resources_rx(sk);
+	strp_done(&ctx->strp);
+}
+
+void tls_sw_free_ctx_rx(struct tls_context *tls_ctx)
+{
+	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 
 	kfree(ctx);
 }
 
+void tls_sw_free_resources_rx(struct sock *sk)
+{
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+	tls_sw_release_resources_rx(sk);
+	tls_sw_free_ctx_rx(tls_ctx);
+}
+
 /* The work handler to transmitt the encrypted records in tx_list */
 static void tx_work_handler(struct work_struct *work)
 {