1/*
  2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
  3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
  4 *
  5 * This software is available to you under a choice of one of two
  6 * licenses.  You may choose to be licensed under the terms of the GNU
  7 * General Public License (GPL) Version 2, available from the file
  8 * COPYING in the main directory of this source tree, or the
  9 * OpenIB.org BSD license below:
 10 *
 11 *     Redistribution and use in source and binary forms, with or
 12 *     without modification, are permitted provided that the following
 13 *     conditions are met:
 14 *
 15 *      - Redistributions of source code must retain the above
 16 *        copyright notice, this list of conditions and the following
 17 *        disclaimer.
 18 *
 19 *      - Redistributions in binary form must reproduce the above
 20 *        copyright notice, this list of conditions and the following
 21 *        disclaimer in the documentation and/or other materials
 22 *        provided with the distribution.
 23 *
 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 31 * SOFTWARE.
 32 */
 33
 34#include <linux/list.h>
 35#include <linux/rcupdate.h>
 36#include <linux/spinlock.h>
 37#include <net/inet_connection_sock.h>
 38#include <net/tls.h>
 39#include <net/tls_toe.h>
 40
 41static LIST_HEAD(device_list);
 42static DEFINE_SPINLOCK(device_spinlock);
 43
 44static void tls_toe_sk_destruct(struct sock *sk)
 45{
 46	struct inet_connection_sock *icsk = inet_csk(sk);
 47	struct tls_context *ctx = tls_get_ctx(sk);
 48
 49	ctx->sk_destruct(sk);
 50	/* Free ctx */
 51	rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 52	tls_ctx_free(sk, ctx);
 53}
 54
 55int tls_toe_bypass(struct sock *sk)
 56{
 57	struct tls_toe_device *dev;
 58	struct tls_context *ctx;
 59	int rc = 0;
 60
 61	spin_lock_bh(&device_spinlock);
 62	list_for_each_entry(dev, &device_list, dev_list) {
 63		if (dev->feature && dev->feature(dev)) {
 64			ctx = tls_ctx_create(sk);
 65			if (!ctx)
 66				goto out;
 67
 68			ctx->sk_destruct = sk->sk_destruct;
 69			sk->sk_destruct = tls_toe_sk_destruct;
 70			ctx->rx_conf = TLS_HW_RECORD;
 71			ctx->tx_conf = TLS_HW_RECORD;
 72			update_sk_prot(sk, ctx);
 73			rc = 1;
 74			break;
 75		}
 76	}
 77out:
 78	spin_unlock_bh(&device_spinlock);
 79	return rc;
 80}
 81
 82void tls_toe_unhash(struct sock *sk)
 83{
 84	struct tls_context *ctx = tls_get_ctx(sk);
 85	struct tls_toe_device *dev;
 86
 87	spin_lock_bh(&device_spinlock);
 88	list_for_each_entry(dev, &device_list, dev_list) {
 89		if (dev->unhash) {
 90			kref_get(&dev->kref);
 91			spin_unlock_bh(&device_spinlock);
 92			dev->unhash(dev, sk);
 93			kref_put(&dev->kref, dev->release);
 94			spin_lock_bh(&device_spinlock);
 95		}
 96	}
 97	spin_unlock_bh(&device_spinlock);
 98	ctx->sk_proto->unhash(sk);
 99}
100
101int tls_toe_hash(struct sock *sk)
102{
103	struct tls_context *ctx = tls_get_ctx(sk);
104	struct tls_toe_device *dev;
105	int err;
106
107	err = ctx->sk_proto->hash(sk);
108	spin_lock_bh(&device_spinlock);
109	list_for_each_entry(dev, &device_list, dev_list) {
110		if (dev->hash) {
111			kref_get(&dev->kref);
112			spin_unlock_bh(&device_spinlock);
113			err |= dev->hash(dev, sk);
114			kref_put(&dev->kref, dev->release);
115			spin_lock_bh(&device_spinlock);
116		}
117	}
118	spin_unlock_bh(&device_spinlock);
119
120	if (err)
121		tls_toe_unhash(sk);
122	return err;
123}
124
125void tls_toe_register_device(struct tls_toe_device *device)
126{
127	spin_lock_bh(&device_spinlock);
128	list_add_tail(&device->dev_list, &device_list);
129	spin_unlock_bh(&device_spinlock);
130}
131EXPORT_SYMBOL(tls_toe_register_device);
132
133void tls_toe_unregister_device(struct tls_toe_device *device)
134{
135	spin_lock_bh(&device_spinlock);
136	list_del(&device->dev_list);
137	spin_unlock_bh(&device_spinlock);
138}
139EXPORT_SYMBOL(tls_toe_unregister_device);