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 tls_toe_sk_destruct(struct sock * sk)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 tls_toe_bypass(struct sock * sk)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 tls_toe_unhash(struct sock * sk)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 tls_toe_hash(struct sock * sk)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 tls_toe_register_device(struct tls_toe_device * device)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 tls_toe_unregister_device(struct tls_toe_device * device)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); 142