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 #include "tls.h"
  42
  43 static LIST_HEAD(device_list);
  44 static DEFINE_SPINLOCK(device_spinlock);
  45
  46 static void tls_toe_sk_destruct(struct sock *sk)
  47 {
  48         struct inet_connection_sock *icsk = inet_csk(sk);
  49         struct tls_context *ctx = tls_get_ctx(sk);
  50
  51         ctx->sk_destruct(sk);
  52         /* Free ctx */
  53         rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
  54         tls_ctx_free(sk, ctx);
  55 }
  56
  57 int tls_toe_bypass(struct sock *sk)
  58 {
  59         struct tls_toe_device *dev;
  60         struct tls_context *ctx;
  61         int rc = 0;
  62
  63         spin_lock_bh(&device_spinlock);
  64         list_for_each_entry(dev, &device_list, dev_list) {
  65                 if (dev->feature && dev->feature(dev)) {
  66                         ctx = tls_ctx_create(sk);
  67                         if (!ctx)
  68                                 goto out;
  69
  70                         ctx->sk_destruct = sk->sk_destruct;
  71                         sk->sk_destruct = tls_toe_sk_destruct;
  72                         ctx->rx_conf = TLS_HW_RECORD;
  73                         ctx->tx_conf = TLS_HW_RECORD;
  74                         update_sk_prot(sk, ctx);
  75                         rc = 1;
  76                         break;
  77                 }
  78         }
  79 out:
  80         spin_unlock_bh(&device_spinlock);
  81         return rc;
  82 }
  83
  84 void tls_toe_unhash(struct sock *sk)
  85 {
  86         struct tls_context *ctx = tls_get_ctx(sk);
  87         struct tls_toe_device *dev;
  88
  89         spin_lock_bh(&device_spinlock);
  90         list_for_each_entry(dev, &device_list, dev_list) {
  91                 if (dev->unhash) {
  92                         kref_get(&dev->kref);
  93                         spin_unlock_bh(&device_spinlock);
  94                         dev->unhash(dev, sk);
  95                         kref_put(&dev->kref, dev->release);
  96                         spin_lock_bh(&device_spinlock);
  97                 }
  98         }
  99         spin_unlock_bh(&device_spinlock);
 100         ctx->sk_proto->unhash(sk);
 101 }
 102
 103 int tls_toe_hash(struct sock *sk)
 104 {
 105         struct tls_context *ctx = tls_get_ctx(sk);
 106         struct tls_toe_device *dev;
 107         int err;
 108
 109         err = ctx->sk_proto->hash(sk);
 110         spin_lock_bh(&device_spinlock);
 111         list_for_each_entry(dev, &device_list, dev_list) {
 112                 if (dev->hash) {
 113                         kref_get(&dev->kref);
 114                         spin_unlock_bh(&device_spinlock);
 115                         err |= dev->hash(dev, sk);
 116                         kref_put(&dev->kref, dev->release);
 117                         spin_lock_bh(&device_spinlock);
 118                 }
 119         }
 120         spin_unlock_bh(&device_spinlock);
 121
 122         if (err)
 123                 tls_toe_unhash(sk);
 124         return err;
 125 }
 126
 127 void tls_toe_register_device(struct tls_toe_device *device)
 128 {
 129         spin_lock_bh(&device_spinlock);
 130         list_add_tail(&device->dev_list, &device_list);
 131         spin_unlock_bh(&device_spinlock);
 132 }
 133 EXPORT_SYMBOL(tls_toe_register_device);
 134
 135 void tls_toe_unregister_device(struct tls_toe_device *device)
 136 {
 137         spin_lock_bh(&device_spinlock);
 138         list_del(&device->dev_list);
 139         spin_unlock_bh(&device_spinlock);
 140 }
 141 EXPORT_SYMBOL(tls_toe_unregister_device);