[crypto v8 03/12] tls: support for inline tls

[Atul Gupta <atul.gupta@xxxxxxxxxxx>]

Facility to register Inline TLS drivers to net/tls. Setup
TLS_FULL_HW prot to listen on offload device.

Cases handled
1. Inline TLS device exists, setup prot for TLS_FULL_HW
2. Atleast one Inline TLS exists, sets TLS_FULL_HW. If
non-inline capable device establish connection move to TLS_SW_TX

Signed-off-by: Atul Gupta <atul.gupta@xxxxxxxxxxx>
---
 net/tls/tls_main.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 80 insertions(+), 7 deletions(-)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index b0d5fce..2ac9510 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -38,6 +38,7 @@
 #include <linux/highmem.h>
 #include <linux/netdevice.h>
 #include <linux/sched/signal.h>
+#include <linux/inetdevice.h>
 
 #include <net/tls.h>
 
@@ -45,13 +46,9 @@
 MODULE_DESCRIPTION("Transport Layer Security Support");
 MODULE_LICENSE("Dual BSD/GPL");
 
-enum {
-	TLS_BASE_TX,
-	TLS_SW_TX,
-	TLS_NUM_CONFIG,
-};
-
-static struct proto tls_prots[TLS_NUM_CONFIG];
+static LIST_HEAD(device_list);
+static DEFINE_MUTEX(device_mutex);
+struct proto tls_prots[TLS_NUM_CONFIG];
 
 static inline void update_sk_prot(struct sock *sk, struct tls_context *ctx)
 {
@@ -450,6 +447,58 @@ static int tls_setsockopt(struct sock *sk, int level, int optname,
 	return do_tls_setsockopt(sk, optname, optval, optlen);
 }
 
+static int tls_hw_prot(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_device *dev;
+
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->feature && dev->feature(dev)) {
+			ctx->hash = sk->sk_prot->hash;
+			ctx->unhash = sk->sk_prot->unhash;
+			ctx->tx_conf = TLS_FULL_HW;
+			update_sk_prot(sk, ctx);
+			break;
+		}
+	}
+	mutex_unlock(&device_mutex);
+	return ctx->tx_conf;
+}
+
+static void tls_hw_unhash(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_device *dev;
+
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->unhash)
+			dev->unhash(dev, sk);
+	}
+	mutex_unlock(&device_mutex);
+	ctx->unhash(sk);
+}
+
+static int tls_hw_hash(struct sock *sk)
+{
+	struct tls_context *ctx = tls_get_ctx(sk);
+	struct tls_device *dev;
+	int err;
+
+	err = ctx->hash(sk);
+	mutex_lock(&device_mutex);
+	list_for_each_entry(dev, &device_list, dev_list) {
+		if (dev->hash)
+			err |= dev->hash(dev, sk);
+	}
+	mutex_unlock(&device_mutex);
+
+	if (err)
+		tls_hw_unhash(sk);
+	return err;
+}
+
 static int tls_init(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -477,6 +526,9 @@ static int tls_init(struct sock *sk)
 	ctx->sk_proto_close = sk->sk_prot->close;
 
 	ctx->tx_conf = TLS_BASE_TX;
+	if (tls_hw_prot(sk) == TLS_FULL_HW)
+		goto out;
+
 	update_sk_prot(sk, ctx);
 out:
 	return rc;
@@ -500,7 +552,27 @@ static void build_protos(struct proto *prot, struct proto *base)
 	prot[TLS_SW_TX] = prot[TLS_BASE_TX];
 	prot[TLS_SW_TX].sendmsg		= tls_sw_sendmsg;
 	prot[TLS_SW_TX].sendpage	= tls_sw_sendpage;
+
+	prot[TLS_FULL_HW] = prot[TLS_BASE_TX];
+	prot[TLS_FULL_HW].hash		= tls_hw_hash;
+	prot[TLS_FULL_HW].unhash	= tls_hw_unhash;
+}
+
+void tls_register_device(struct tls_device *device)
+{
+	mutex_lock(&device_mutex);
+	list_add_tail(&device->dev_list, &device_list);
+	mutex_unlock(&device_mutex);
+}
+EXPORT_SYMBOL(tls_register_device);
+
+void tls_unregister_device(struct tls_device *device)
+{
+	mutex_lock(&device_mutex);
+	list_del(&device->dev_list);
+	mutex_unlock(&device_mutex);
 }
+EXPORT_SYMBOL(tls_unregister_device);
 
 static int __init tls_register(void)
 {
@@ -510,6 +582,7 @@ static int __init tls_register(void)
 
 	return 0;
 }
+EXPORT_SYMBOL(tls_prots);
 
 static void __exit tls_unregister(void)
 {
-- 
1.8.3.1