net/tls/tls_toe.c

   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
  41 static LIST_HEAD(device_list);
  42 static DEFINE_SPINLOCK(device_spinlock);
  43
  44 static 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
  55 int 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         }
  77 out:
  78         spin_unlock_bh(&device_spinlock);
  79         return rc;
  80 }
  81
  82 void 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
 101 int 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
 125 void 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 }
 131 EXPORT_SYMBOL(tls_toe_register_device);
 132
 133 void 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 }
 139 EXPORT_SYMBOL(tls_toe_unregister_device);