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
tls_toe_sk_destruct(struct sock * sk)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
tls_toe_bypass(struct sock * sk)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
tls_toe_unhash(struct sock * sk)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
tls_toe_hash(struct sock * sk)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
tls_toe_register_device(struct tls_toe_device * device)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
tls_toe_unregister_device(struct tls_toe_device * device)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);
140