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Message-Id: <1519321890-22919-1-git-send-email-atul.gupta@chelsio.com>
Date: Thu, 22 Feb 2018 23:21:30 +0530
From: Atul Gupta <atul.gupta@...lsio.com>
To: davejwatson@...com, davem@...emloft.net,
herbert@...dor.apana.org.au
Cc: sd@...asysnail.net, linux-crypto@...r.kernel.org,
netdev@...r.kernel.org, ganeshgr@...lsio.com
Subject: [Crypto v7 03/12] tls: support for inline tls
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
3. default mode TLS_SW_TX continues
Signed-off-by: Atul Gupta <atul.gupta@...lsio.com>
---
net/tls/tls_main.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 116 insertions(+), 7 deletions(-)
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index b0d5fce..34f8781 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)
{
@@ -260,6 +257,37 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
sk_proto_close(sk, timeout);
}
+static struct net_device *get_netdev(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct net_device *netdev;
+
+ netdev = dev_get_by_index(sock_net(sk), inet->cork.fl.flowi_oif);
+ return netdev;
+}
+
+static int tls_offload_dev_absent(struct sock *sk)
+{
+ struct net_device *netdev;
+ struct tls_device *dev;
+ int rc = 0;
+
+ netdev = get_netdev(sk);
+ if (!netdev)
+ return -EINVAL;
+
+ mutex_lock(&device_mutex);
+ list_for_each_entry(dev, &device_list, dev_list) {
+ if (dev->netdev && dev->netdev(dev, netdev)) {
+ rc = -EEXIST;
+ break;
+ }
+ }
+ mutex_unlock(&device_mutex);
+ dev_put(netdev);
+ return rc;
+}
+
static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
int __user *optlen)
{
@@ -403,6 +431,15 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
goto err_crypto_info;
}
+ rc = tls_offload_dev_absent(sk);
+ if (rc == -EINVAL) {
+ goto out;
+ } else if (rc == -EEXIST) {
+ /* Retain HW unhash for cleanup and move to SW Tx */
+ sk->sk_prot[TLS_BASE_TX].unhash =
+ sk->sk_prot[TLS_FULL_HW].unhash;
+ }
+
/* currently SW is default, we will have ethtool in future */
rc = tls_set_sw_offload(sk, ctx);
tx_conf = TLS_SW_TX;
@@ -450,6 +487,54 @@ 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->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_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);
+ sk->sk_prot->unhash(sk);
+}
+
+static int tls_hw_hash(struct sock *sk)
+{
+ struct tls_device *dev;
+ int err;
+
+ err = sk->sk_prot->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 +562,9 @@ 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 +588,27 @@ 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 +618,7 @@ static int __init tls_register(void)
return 0;
}
+EXPORT_SYMBOL(tls_prots);
static void __exit tls_unregister(void)
{
--
1.8.3.1
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