1/*
2 BlueZ - Bluetooth protocol stack for Linux
3
4 Copyright (C) 2015 Intel Corporation
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24#include <linux/unaligned.h>
25
26#include <net/bluetooth/bluetooth.h>
27#include <net/bluetooth/hci_core.h>
28#include <net/bluetooth/hci_mon.h>
29#include <net/bluetooth/mgmt.h>
30
31#include "mgmt_util.h"
32
33static struct sk_buff *create_monitor_ctrl_event(__le16 index, u32 cookie,
34 u16 opcode, u16 len, void *buf)
35{
36 struct hci_mon_hdr *hdr;
37 struct sk_buff *skb;
38
39 skb = bt_skb_alloc(len: 6 + len, GFP_ATOMIC);
40 if (!skb)
41 return NULL;
42
43 put_unaligned_le32(val: cookie, p: skb_put(skb, len: 4));
44 put_unaligned_le16(val: opcode, p: skb_put(skb, len: 2));
45
46 if (buf)
47 skb_put_data(skb, data: buf, len);
48
49 __net_timestamp(skb);
50
51 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
52 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
53 hdr->index = index;
54 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
55
56 return skb;
57}
58
59struct sk_buff *mgmt_alloc_skb(struct hci_dev *hdev, u16 opcode,
60 unsigned int size)
61{
62 struct sk_buff *skb;
63
64 skb = alloc_skb(size: sizeof(struct mgmt_hdr) + size, GFP_KERNEL);
65 if (!skb)
66 return skb;
67
68 skb_reserve(skb, len: sizeof(struct mgmt_hdr));
69 bt_cb(skb)->mgmt.hdev = hdev;
70 bt_cb(skb)->mgmt.opcode = opcode;
71
72 return skb;
73}
74
75int mgmt_send_event_skb(unsigned short channel, struct sk_buff *skb, int flag,
76 struct sock *skip_sk)
77{
78 struct hci_dev *hdev;
79 struct mgmt_hdr *hdr;
80 int len;
81
82 if (!skb)
83 return -EINVAL;
84
85 len = skb->len;
86 hdev = bt_cb(skb)->mgmt.hdev;
87
88 /* Time stamp */
89 __net_timestamp(skb);
90
91 /* Send just the data, without headers, to the monitor */
92 if (channel == HCI_CHANNEL_CONTROL)
93 hci_send_monitor_ctrl_event(hdev, bt_cb(skb)->mgmt.opcode,
94 data: skb->data, data_len: skb->len,
95 tstamp: skb_get_ktime(skb), flag, skip_sk);
96
97 hdr = skb_push(skb, len: sizeof(*hdr));
98 hdr->opcode = cpu_to_le16(bt_cb(skb)->mgmt.opcode);
99 if (hdev)
100 hdr->index = cpu_to_le16(hdev->id);
101 else
102 hdr->index = cpu_to_le16(MGMT_INDEX_NONE);
103 hdr->len = cpu_to_le16(len);
104
105 hci_send_to_channel(channel, skb, flag, skip_sk);
106
107 kfree_skb(skb);
108 return 0;
109}
110
111int mgmt_send_event(u16 event, struct hci_dev *hdev, unsigned short channel,
112 void *data, u16 data_len, int flag, struct sock *skip_sk)
113{
114 struct sk_buff *skb;
115
116 skb = mgmt_alloc_skb(hdev, opcode: event, size: data_len);
117 if (!skb)
118 return -ENOMEM;
119
120 if (data)
121 skb_put_data(skb, data, len: data_len);
122
123 return mgmt_send_event_skb(channel, skb, flag, skip_sk);
124}
125
126int mgmt_cmd_status(struct sock *sk, u16 index, u16 cmd, u8 status)
127{
128 struct sk_buff *skb, *mskb;
129 struct mgmt_hdr *hdr;
130 struct mgmt_ev_cmd_status *ev;
131 int err;
132
133 BT_DBG("sock %p, index %u, cmd %u, status %u", sk, index, cmd, status);
134
135 skb = alloc_skb(size: sizeof(*hdr) + sizeof(*ev), GFP_KERNEL);
136 if (!skb)
137 return -ENOMEM;
138
139 hdr = skb_put(skb, len: sizeof(*hdr));
140
141 hdr->opcode = cpu_to_le16(MGMT_EV_CMD_STATUS);
142 hdr->index = cpu_to_le16(index);
143 hdr->len = cpu_to_le16(sizeof(*ev));
144
145 ev = skb_put(skb, len: sizeof(*ev));
146 ev->status = status;
147 ev->opcode = cpu_to_le16(cmd);
148
149 mskb = create_monitor_ctrl_event(index: hdr->index, cookie: hci_sock_get_cookie(sk),
150 MGMT_EV_CMD_STATUS, len: sizeof(*ev), buf: ev);
151 if (mskb)
152 skb->tstamp = mskb->tstamp;
153 else
154 __net_timestamp(skb);
155
156 err = sock_queue_rcv_skb(sk, skb);
157 if (err < 0)
158 kfree_skb(skb);
159
160 if (mskb) {
161 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb: mskb,
162 flag: HCI_SOCK_TRUSTED, NULL);
163 kfree_skb(skb: mskb);
164 }
165
166 return err;
167}
168
169int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
170 void *rp, size_t rp_len)
171{
172 struct sk_buff *skb, *mskb;
173 struct mgmt_hdr *hdr;
174 struct mgmt_ev_cmd_complete *ev;
175 int err;
176
177 BT_DBG("sock %p", sk);
178
179 skb = alloc_skb(size: sizeof(*hdr) + sizeof(*ev) + rp_len, GFP_KERNEL);
180 if (!skb)
181 return -ENOMEM;
182
183 hdr = skb_put(skb, len: sizeof(*hdr));
184
185 hdr->opcode = cpu_to_le16(MGMT_EV_CMD_COMPLETE);
186 hdr->index = cpu_to_le16(index);
187 hdr->len = cpu_to_le16(sizeof(*ev) + rp_len);
188
189 ev = skb_put(skb, len: sizeof(*ev) + rp_len);
190 ev->opcode = cpu_to_le16(cmd);
191 ev->status = status;
192
193 if (rp)
194 memcpy(ev->data, rp, rp_len);
195
196 mskb = create_monitor_ctrl_event(index: hdr->index, cookie: hci_sock_get_cookie(sk),
197 MGMT_EV_CMD_COMPLETE,
198 len: sizeof(*ev) + rp_len, buf: ev);
199 if (mskb)
200 skb->tstamp = mskb->tstamp;
201 else
202 __net_timestamp(skb);
203
204 err = sock_queue_rcv_skb(sk, skb);
205 if (err < 0)
206 kfree_skb(skb);
207
208 if (mskb) {
209 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb: mskb,
210 flag: HCI_SOCK_TRUSTED, NULL);
211 kfree_skb(skb: mskb);
212 }
213
214 return err;
215}
216
217struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
218 struct hci_dev *hdev)
219{
220 struct mgmt_pending_cmd *cmd, *tmp;
221
222 mutex_lock(&hdev->mgmt_pending_lock);
223
224 list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
225 if (hci_sock_get_channel(sk: cmd->sk) != channel)
226 continue;
227
228 if (cmd->opcode == opcode) {
229 mutex_unlock(lock: &hdev->mgmt_pending_lock);
230 return cmd;
231 }
232 }
233
234 mutex_unlock(lock: &hdev->mgmt_pending_lock);
235
236 return NULL;
237}
238
239void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev, bool remove,
240 void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
241 void *data)
242{
243 struct mgmt_pending_cmd *cmd, *tmp;
244
245 mutex_lock(&hdev->mgmt_pending_lock);
246
247 list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
248 if (opcode > 0 && cmd->opcode != opcode)
249 continue;
250
251 if (remove)
252 list_del(entry: &cmd->list);
253
254 cb(cmd, data);
255
256 if (remove)
257 mgmt_pending_free(cmd);
258 }
259
260 mutex_unlock(lock: &hdev->mgmt_pending_lock);
261}
262
263struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
264 struct hci_dev *hdev,
265 void *data, u16 len)
266{
267 struct mgmt_pending_cmd *cmd;
268
269 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
270 if (!cmd)
271 return NULL;
272
273 cmd->opcode = opcode;
274 cmd->hdev = hdev;
275
276 cmd->param = kmemdup(data, len, GFP_KERNEL);
277 if (!cmd->param) {
278 kfree(objp: cmd);
279 return NULL;
280 }
281
282 cmd->param_len = len;
283
284 cmd->sk = sk;
285 sock_hold(sk);
286
287 return cmd;
288}
289
290struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
291 struct hci_dev *hdev,
292 void *data, u16 len)
293{
294 struct mgmt_pending_cmd *cmd;
295
296 cmd = mgmt_pending_new(sk, opcode, hdev, data, len);
297 if (!cmd)
298 return NULL;
299
300 mutex_lock(&hdev->mgmt_pending_lock);
301 list_add_tail(new: &cmd->list, head: &hdev->mgmt_pending);
302 mutex_unlock(lock: &hdev->mgmt_pending_lock);
303
304 return cmd;
305}
306
307void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
308{
309 sock_put(sk: cmd->sk);
310 kfree(objp: cmd->param);
311 kfree(objp: cmd);
312}
313
314void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
315{
316 mutex_lock(&cmd->hdev->mgmt_pending_lock);
317 list_del(entry: &cmd->list);
318 mutex_unlock(lock: &cmd->hdev->mgmt_pending_lock);
319
320 mgmt_pending_free(cmd);
321}
322
323bool __mgmt_pending_listed(struct hci_dev *hdev, struct mgmt_pending_cmd *cmd)
324{
325 struct mgmt_pending_cmd *tmp;
326
327 lockdep_assert_held(&hdev->mgmt_pending_lock);
328
329 if (!cmd)
330 return false;
331
332 list_for_each_entry(tmp, &hdev->mgmt_pending, list) {
333 if (cmd == tmp)
334 return true;
335 }
336
337 return false;
338}
339
340bool mgmt_pending_listed(struct hci_dev *hdev, struct mgmt_pending_cmd *cmd)
341{
342 bool listed;
343
344 mutex_lock(&hdev->mgmt_pending_lock);
345 listed = __mgmt_pending_listed(hdev, cmd);
346 mutex_unlock(lock: &hdev->mgmt_pending_lock);
347
348 return listed;
349}
350
351bool mgmt_pending_valid(struct hci_dev *hdev, struct mgmt_pending_cmd *cmd)
352{
353 bool listed;
354
355 if (!cmd)
356 return false;
357
358 mutex_lock(&hdev->mgmt_pending_lock);
359
360 listed = __mgmt_pending_listed(hdev, cmd);
361 if (listed)
362 list_del(entry: &cmd->list);
363
364 mutex_unlock(lock: &hdev->mgmt_pending_lock);
365
366 return listed;
367}
368
369void mgmt_mesh_foreach(struct hci_dev *hdev,
370 void (*cb)(struct mgmt_mesh_tx *mesh_tx, void *data),
371 void *data, struct sock *sk)
372{
373 struct mgmt_mesh_tx *mesh_tx, *tmp;
374
375 list_for_each_entry_safe(mesh_tx, tmp, &hdev->mesh_pending, list) {
376 if (!sk || mesh_tx->sk == sk)
377 cb(mesh_tx, data);
378 }
379}
380
381struct mgmt_mesh_tx *mgmt_mesh_next(struct hci_dev *hdev, struct sock *sk)
382{
383 struct mgmt_mesh_tx *mesh_tx;
384
385 if (list_empty(head: &hdev->mesh_pending))
386 return NULL;
387
388 list_for_each_entry(mesh_tx, &hdev->mesh_pending, list) {
389 if (!sk || mesh_tx->sk == sk)
390 return mesh_tx;
391 }
392
393 return NULL;
394}
395
396struct mgmt_mesh_tx *mgmt_mesh_find(struct hci_dev *hdev, u8 handle)
397{
398 struct mgmt_mesh_tx *mesh_tx;
399
400 if (list_empty(head: &hdev->mesh_pending))
401 return NULL;
402
403 list_for_each_entry(mesh_tx, &hdev->mesh_pending, list) {
404 if (mesh_tx->handle == handle)
405 return mesh_tx;
406 }
407
408 return NULL;
409}
410
411struct mgmt_mesh_tx *mgmt_mesh_add(struct sock *sk, struct hci_dev *hdev,
412 void *data, u16 len)
413{
414 struct mgmt_mesh_tx *mesh_tx;
415
416 mesh_tx = kzalloc(sizeof(*mesh_tx), GFP_KERNEL);
417 if (!mesh_tx)
418 return NULL;
419
420 hdev->mesh_send_ref++;
421 if (!hdev->mesh_send_ref)
422 hdev->mesh_send_ref++;
423
424 mesh_tx->handle = hdev->mesh_send_ref;
425 mesh_tx->index = hdev->id;
426 memcpy(mesh_tx->param, data, len);
427 mesh_tx->param_len = len;
428 mesh_tx->sk = sk;
429 sock_hold(sk);
430
431 list_add_tail(new: &mesh_tx->list, head: &hdev->mesh_pending);
432
433 return mesh_tx;
434}
435
436void mgmt_mesh_remove(struct mgmt_mesh_tx *mesh_tx)
437{
438 list_del(entry: &mesh_tx->list);
439 sock_put(sk: mesh_tx->sk);
440 kfree(objp: mesh_tx);
441}
442

source code of linux/net/bluetooth/mgmt_util.c