1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
Copyright (c) 2011,2012 Intel Corp.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 and
only version 2 as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/a2mp.h>
/* A2MP build & send command helper functions */
static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
{
struct a2mp_cmd *cmd;
int plen;
plen = sizeof(*cmd) + len;
cmd = kzalloc(plen, GFP_KERNEL);
if (!cmd)
return NULL;
cmd->code = code;
cmd->ident = ident;
cmd->len = cpu_to_le16(len);
memcpy(cmd->data, data, len);
return cmd;
}
static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
void *data)
{
struct l2cap_chan *chan = mgr->a2mp_chan;
struct a2mp_cmd *cmd;
u16 total_len = len + sizeof(*cmd);
struct kvec iv;
struct msghdr msg;
cmd = __a2mp_build(code, ident, len, data);
if (!cmd)
return;
iv.iov_base = cmd;
iv.iov_len = total_len;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = (struct iovec *) &iv;
msg.msg_iovlen = 1;
l2cap_chan_send(chan, &msg, total_len, 0);
kfree(cmd);
}
static void a2mp_chan_close_cb(struct l2cap_chan *chan)
{
l2cap_chan_destroy(chan);
}
static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
{
struct amp_mgr *mgr = chan->data;
if (!mgr)
return;
BT_DBG("chan %p state %s", chan, state_to_string(state));
chan->state = state;
switch (state) {
case BT_CLOSED:
if (mgr)
amp_mgr_put(mgr);
break;
}
}
static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
unsigned long len, int nb)
{
return bt_skb_alloc(len, GFP_KERNEL);
}
static struct l2cap_chan *a2mp_chan_no_new_conn_cb(struct l2cap_chan *chan)
{
BT_ERR("new_connection for chan %p not implemented", chan);
return NULL;
}
static void a2mp_chan_no_teardown_cb(struct l2cap_chan *chan, int err)
{
BT_ERR("teardown for chan %p not implemented", chan);
}
static void a2mp_chan_no_ready(struct l2cap_chan *chan)
{
BT_ERR("ready for chan %p not implemented", chan);
}
static struct l2cap_ops a2mp_chan_ops = {
.name = "L2CAP A2MP channel",
.close = a2mp_chan_close_cb,
.state_change = a2mp_chan_state_change_cb,
.alloc_skb = a2mp_chan_alloc_skb_cb,
/* Not implemented for A2MP */
.new_connection = a2mp_chan_no_new_conn_cb,
.teardown = a2mp_chan_no_teardown_cb,
.ready = a2mp_chan_no_ready,
};
static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn)
{
struct l2cap_chan *chan;
int err;
chan = l2cap_chan_create();
if (!chan)
return NULL;
BT_DBG("chan %p", chan);
hci_conn_hold(conn->hcon);
chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
chan->ops = &a2mp_chan_ops;
l2cap_chan_set_defaults(chan);
chan->remote_max_tx = chan->max_tx;
chan->remote_tx_win = chan->tx_win;
chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
skb_queue_head_init(&chan->tx_q);
chan->mode = L2CAP_MODE_ERTM;
err = l2cap_ertm_init(chan);
if (err < 0) {
l2cap_chan_del(chan, 0);
return NULL;
}
chan->conf_state = 0;
l2cap_chan_add(conn, chan);
chan->remote_mps = chan->omtu;
chan->mps = chan->omtu;
chan->state = BT_CONNECTED;
return chan;
}
/* AMP Manager functions */
void amp_mgr_get(struct amp_mgr *mgr)
{
BT_DBG("mgr %p", mgr);
kref_get(&mgr->kref);
}
static void amp_mgr_destroy(struct kref *kref)
{
struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
BT_DBG("mgr %p", mgr);
kfree(mgr);
}
int amp_mgr_put(struct amp_mgr *mgr)
{
BT_DBG("mgr %p", mgr);
return kref_put(&mgr->kref, &_mgr_destroy);
}
static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
{
struct amp_mgr *mgr;
struct l2cap_chan *chan;
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return NULL;
BT_DBG("conn %p mgr %p", conn, mgr);
mgr->l2cap_conn = conn;
chan = a2mp_chan_open(conn);
if (!chan) {
kfree(mgr);
return NULL;
}
mgr->a2mp_chan = chan;
chan->data = mgr;
conn->hcon->amp_mgr = mgr;
kref_init(&mgr->kref);
return mgr;
}
|
