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);
142
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