Merge tag 'socfpga_update_for_v5.5' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / 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);