LXR linux/net/tls/tls

   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);
 140