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466f8004 AE |
1 | /* |
2 | Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved. | |
3 | Copyright (c) 2011,2012 Intel Corp. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 and | |
7 | only version 2 as published by the Free Software Foundation. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <net/bluetooth/bluetooth.h> | |
16 | #include <net/bluetooth/hci_core.h> | |
17 | #include <net/bluetooth/l2cap.h> | |
9740e49d | 18 | #include <net/bluetooth/a2mp.h> |
466f8004 | 19 | |
f6d3c6e7 AE |
20 | /* A2MP build & send command helper functions */ |
21 | static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data) | |
22 | { | |
23 | struct a2mp_cmd *cmd; | |
24 | int plen; | |
25 | ||
26 | plen = sizeof(*cmd) + len; | |
27 | cmd = kzalloc(plen, GFP_KERNEL); | |
28 | if (!cmd) | |
29 | return NULL; | |
30 | ||
31 | cmd->code = code; | |
32 | cmd->ident = ident; | |
33 | cmd->len = cpu_to_le16(len); | |
34 | ||
35 | memcpy(cmd->data, data, len); | |
36 | ||
37 | return cmd; | |
38 | } | |
39 | ||
40 | static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, | |
41 | void *data) | |
42 | { | |
43 | struct l2cap_chan *chan = mgr->a2mp_chan; | |
44 | struct a2mp_cmd *cmd; | |
45 | u16 total_len = len + sizeof(*cmd); | |
46 | struct kvec iv; | |
47 | struct msghdr msg; | |
48 | ||
49 | cmd = __a2mp_build(code, ident, len, data); | |
50 | if (!cmd) | |
51 | return; | |
52 | ||
53 | iv.iov_base = cmd; | |
54 | iv.iov_len = total_len; | |
55 | ||
56 | memset(&msg, 0, sizeof(msg)); | |
57 | ||
58 | msg.msg_iov = (struct iovec *) &iv; | |
59 | msg.msg_iovlen = 1; | |
60 | ||
61 | l2cap_chan_send(chan, &msg, total_len, 0); | |
62 | ||
63 | kfree(cmd); | |
64 | } | |
65 | ||
21dbd2ce AE |
66 | /* Processing A2MP messages */ |
67 | static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb, | |
68 | struct a2mp_cmd *hdr) | |
69 | { | |
70 | struct a2mp_cmd_rej *rej = (void *) skb->data; | |
71 | ||
72 | if (le16_to_cpu(hdr->len) < sizeof(*rej)) | |
73 | return -EINVAL; | |
74 | ||
75 | BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason)); | |
76 | ||
77 | skb_pull(skb, sizeof(*rej)); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
6b44d9b8 AE |
82 | /* Handle A2MP signalling */ |
83 | static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) | |
84 | { | |
85 | struct a2mp_cmd *hdr = (void *) skb->data; | |
86 | struct amp_mgr *mgr = chan->data; | |
87 | int err = 0; | |
88 | ||
89 | amp_mgr_get(mgr); | |
90 | ||
91 | while (skb->len >= sizeof(*hdr)) { | |
92 | struct a2mp_cmd *hdr = (void *) skb->data; | |
93 | u16 len = le16_to_cpu(hdr->len); | |
94 | ||
95 | BT_DBG("code 0x%02x id %d len %d", hdr->code, hdr->ident, len); | |
96 | ||
97 | skb_pull(skb, sizeof(*hdr)); | |
98 | ||
99 | if (len > skb->len || !hdr->ident) { | |
100 | err = -EINVAL; | |
101 | break; | |
102 | } | |
103 | ||
104 | mgr->ident = hdr->ident; | |
105 | ||
106 | switch (hdr->code) { | |
107 | case A2MP_COMMAND_REJ: | |
21dbd2ce AE |
108 | a2mp_command_rej(mgr, skb, hdr); |
109 | break; | |
110 | ||
6b44d9b8 AE |
111 | case A2MP_DISCOVER_REQ: |
112 | case A2MP_CHANGE_NOTIFY: | |
113 | case A2MP_GETINFO_REQ: | |
114 | case A2MP_GETAMPASSOC_REQ: | |
115 | case A2MP_CREATEPHYSLINK_REQ: | |
116 | case A2MP_DISCONNPHYSLINK_REQ: | |
117 | case A2MP_CHANGE_RSP: | |
118 | case A2MP_DISCOVER_RSP: | |
119 | case A2MP_GETINFO_RSP: | |
120 | case A2MP_GETAMPASSOC_RSP: | |
121 | case A2MP_CREATEPHYSLINK_RSP: | |
122 | case A2MP_DISCONNPHYSLINK_RSP: | |
123 | default: | |
124 | BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code); | |
125 | err = -EINVAL; | |
126 | break; | |
127 | } | |
128 | } | |
129 | ||
130 | if (err) { | |
131 | struct a2mp_cmd_rej rej; | |
132 | rej.reason = __constant_cpu_to_le16(0); | |
133 | ||
134 | BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err); | |
135 | ||
136 | a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej), | |
137 | &rej); | |
138 | } | |
139 | ||
140 | /* Always free skb and return success error code to prevent | |
141 | from sending L2CAP Disconnect over A2MP channel */ | |
142 | kfree_skb(skb); | |
143 | ||
144 | amp_mgr_put(mgr); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
46d5c908 AE |
149 | static void a2mp_chan_close_cb(struct l2cap_chan *chan) |
150 | { | |
151 | l2cap_chan_destroy(chan); | |
152 | } | |
153 | ||
154 | static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state) | |
155 | { | |
156 | struct amp_mgr *mgr = chan->data; | |
157 | ||
158 | if (!mgr) | |
159 | return; | |
160 | ||
161 | BT_DBG("chan %p state %s", chan, state_to_string(state)); | |
162 | ||
163 | chan->state = state; | |
164 | ||
165 | switch (state) { | |
166 | case BT_CLOSED: | |
167 | if (mgr) | |
168 | amp_mgr_put(mgr); | |
169 | break; | |
170 | } | |
171 | } | |
172 | ||
173 | static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan, | |
174 | unsigned long len, int nb) | |
175 | { | |
176 | return bt_skb_alloc(len, GFP_KERNEL); | |
177 | } | |
178 | ||
179 | static struct l2cap_chan *a2mp_chan_no_new_conn_cb(struct l2cap_chan *chan) | |
180 | { | |
181 | BT_ERR("new_connection for chan %p not implemented", chan); | |
182 | ||
183 | return NULL; | |
184 | } | |
185 | ||
186 | static void a2mp_chan_no_teardown_cb(struct l2cap_chan *chan, int err) | |
187 | { | |
188 | BT_ERR("teardown for chan %p not implemented", chan); | |
189 | } | |
190 | ||
191 | static void a2mp_chan_no_ready(struct l2cap_chan *chan) | |
192 | { | |
193 | BT_ERR("ready for chan %p not implemented", chan); | |
194 | } | |
195 | ||
466f8004 AE |
196 | static struct l2cap_ops a2mp_chan_ops = { |
197 | .name = "L2CAP A2MP channel", | |
6b44d9b8 | 198 | .recv = a2mp_chan_recv_cb, |
46d5c908 AE |
199 | .close = a2mp_chan_close_cb, |
200 | .state_change = a2mp_chan_state_change_cb, | |
201 | .alloc_skb = a2mp_chan_alloc_skb_cb, | |
202 | ||
203 | /* Not implemented for A2MP */ | |
204 | .new_connection = a2mp_chan_no_new_conn_cb, | |
205 | .teardown = a2mp_chan_no_teardown_cb, | |
206 | .ready = a2mp_chan_no_ready, | |
466f8004 AE |
207 | }; |
208 | ||
209 | static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn) | |
210 | { | |
211 | struct l2cap_chan *chan; | |
212 | int err; | |
213 | ||
214 | chan = l2cap_chan_create(); | |
215 | if (!chan) | |
216 | return NULL; | |
217 | ||
218 | BT_DBG("chan %p", chan); | |
219 | ||
220 | hci_conn_hold(conn->hcon); | |
221 | ||
222 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
223 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
224 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
225 | ||
226 | chan->ops = &a2mp_chan_ops; | |
227 | ||
228 | l2cap_chan_set_defaults(chan); | |
229 | chan->remote_max_tx = chan->max_tx; | |
230 | chan->remote_tx_win = chan->tx_win; | |
231 | ||
232 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; | |
233 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; | |
234 | ||
235 | skb_queue_head_init(&chan->tx_q); | |
236 | ||
237 | chan->mode = L2CAP_MODE_ERTM; | |
238 | ||
239 | err = l2cap_ertm_init(chan); | |
240 | if (err < 0) { | |
241 | l2cap_chan_del(chan, 0); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | chan->conf_state = 0; | |
246 | ||
247 | l2cap_chan_add(conn, chan); | |
248 | ||
249 | chan->remote_mps = chan->omtu; | |
250 | chan->mps = chan->omtu; | |
251 | ||
252 | chan->state = BT_CONNECTED; | |
253 | ||
254 | return chan; | |
255 | } | |
9740e49d AE |
256 | |
257 | /* AMP Manager functions */ | |
258 | void amp_mgr_get(struct amp_mgr *mgr) | |
259 | { | |
260 | BT_DBG("mgr %p", mgr); | |
261 | ||
262 | kref_get(&mgr->kref); | |
263 | } | |
264 | ||
265 | static void amp_mgr_destroy(struct kref *kref) | |
266 | { | |
267 | struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref); | |
268 | ||
269 | BT_DBG("mgr %p", mgr); | |
270 | ||
271 | kfree(mgr); | |
272 | } | |
273 | ||
274 | int amp_mgr_put(struct amp_mgr *mgr) | |
275 | { | |
276 | BT_DBG("mgr %p", mgr); | |
277 | ||
278 | return kref_put(&mgr->kref, &_mgr_destroy); | |
279 | } | |
280 | ||
281 | static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn) | |
282 | { | |
283 | struct amp_mgr *mgr; | |
284 | struct l2cap_chan *chan; | |
285 | ||
286 | mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); | |
287 | if (!mgr) | |
288 | return NULL; | |
289 | ||
290 | BT_DBG("conn %p mgr %p", conn, mgr); | |
291 | ||
292 | mgr->l2cap_conn = conn; | |
293 | ||
294 | chan = a2mp_chan_open(conn); | |
295 | if (!chan) { | |
296 | kfree(mgr); | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | mgr->a2mp_chan = chan; | |
301 | chan->data = mgr; | |
302 | ||
303 | conn->hcon->amp_mgr = mgr; | |
304 | ||
305 | kref_init(&mgr->kref); | |
306 | ||
307 | return mgr; | |
308 | } |