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/*
* 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.
*/
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <net/inet_connection_sock.h>
#include <net/tls.h>
#include <net/tls_toe.h>
static LIST_HEAD(device_list);
static DEFINE_SPINLOCK(device_spinlock);
static void tls_toe_sk_destruct(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tls_context *ctx = tls_get_ctx(sk);
ctx->sk_destruct(sk);
/* Free ctx */
rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
tls_ctx_free(sk, ctx);
}
int tls_toe_bypass(struct sock *sk)
{
struct tls_toe_device *dev;
struct tls_context *ctx;
int rc = 0;
spin_lock_bh(&device_spinlock);
list_for_each_entry(dev, &device_list, dev_list) {
if (dev->feature && dev->feature(dev)) {
ctx = tls_ctx_create(sk);
if (!ctx)
goto out;
ctx->sk_destruct = sk->sk_destruct;
sk->sk_destruct = tls_toe_sk_destruct;
ctx->rx_conf = TLS_HW_RECORD;
ctx->tx_conf = TLS_HW_RECORD;
update_sk_prot(sk, ctx);
rc = 1;
break;
}
}
out:
spin_unlock_bh(&device_spinlock);
return rc;
}
void tls_toe_unhash(struct sock *sk)
{
struct tls_context *ctx = tls_get_ctx(sk);
struct tls_toe_device *dev;
spin_lock_bh(&device_spinlock);
list_for_each_entry(dev, &device_list, dev_list) {
if (dev->unhash) {
kref_get(&dev->kref);
spin_unlock_bh(&device_spinlock);
dev->unhash(dev, sk);
kref_put(&dev->kref, dev->release);
spin_lock_bh(&device_spinlock);
}
}
spin_unlock_bh(&device_spinlock);
ctx->sk_proto->unhash(sk);
}
int tls_toe_hash(struct sock *sk)
{
struct tls_context *ctx = tls_get_ctx(sk);
struct tls_toe_device *dev;
int err;
err = ctx->sk_proto->hash(sk);
spin_lock_bh(&device_spinlock);
list_for_each_entry(dev, &device_list, dev_list) {
if (dev->hash) {
kref_get(&dev->kref);
spin_unlock_bh(&device_spinlock);
err |= dev->hash(dev, sk);
kref_put(&dev->kref, dev->release);
spin_lock_bh(&device_spinlock);
}
}
spin_unlock_bh(&device_spinlock);
if (err)
tls_toe_unhash(sk);
return err;
}
void tls_toe_register_device(struct tls_toe_device *device)
{
spin_lock_bh(&device_spinlock);
list_add_tail(&device->dev_list, &device_list);
spin_unlock_bh(&device_spinlock);
}
EXPORT_SYMBOL(tls_toe_register_device);
void tls_toe_unregister_device(struct tls_toe_device *device)
{
spin_lock_bh(&device_spinlock);
list_del(&device->dev_list);
spin_unlock_bh(&device_spinlock);
}
EXPORT_SYMBOL(tls_toe_unregister_device);
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