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
create_monitor_ctrl_event(__le16 index,u32 cookie,u16 opcode,u16 len,void * buf)33 static 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(6 + len, GFP_ATOMIC);
40 if (!skb)
41 return NULL;
42
43 put_unaligned_le32(cookie, skb_put(skb, 4));
44 put_unaligned_le16(opcode, skb_put(skb, 2));
45
46 if (buf)
47 skb_put_data(skb, 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
mgmt_alloc_skb(struct hci_dev * hdev,u16 opcode,unsigned int size)59 struct 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(sizeof(struct mgmt_hdr) + size, GFP_KERNEL);
65 if (!skb)
66 return skb;
67
68 skb_reserve(skb, sizeof(struct mgmt_hdr));
69 bt_cb(skb)->mgmt.hdev = hdev;
70 bt_cb(skb)->mgmt.opcode = opcode;
71
72 return skb;
73 }
74
mgmt_send_event_skb(unsigned short channel,struct sk_buff * skb,int flag,struct sock * skip_sk)75 int 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 skb->data, skb->len,
95 skb_get_ktime(skb), flag, skip_sk);
96
97 hdr = skb_push(skb, 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
mgmt_send_event(u16 event,struct hci_dev * hdev,unsigned short channel,void * data,u16 data_len,int flag,struct sock * skip_sk)111 int 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, event, data_len);
117 if (!skb)
118 return -ENOMEM;
119
120 if (data)
121 skb_put_data(skb, data, data_len);
122
123 return mgmt_send_event_skb(channel, skb, flag, skip_sk);
124 }
125
mgmt_cmd_status(struct sock * sk,u16 index,u16 cmd,u8 status)126 int 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(sizeof(*hdr) + sizeof(*ev), GFP_KERNEL);
136 if (!skb)
137 return -ENOMEM;
138
139 hdr = skb_put(skb, 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, sizeof(*ev));
146 ev->status = status;
147 ev->opcode = cpu_to_le16(cmd);
148
149 mskb = create_monitor_ctrl_event(hdr->index, hci_sock_get_cookie(sk),
150 MGMT_EV_CMD_STATUS, sizeof(*ev), 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, mskb,
162 HCI_SOCK_TRUSTED, NULL);
163 kfree_skb(mskb);
164 }
165
166 return err;
167 }
168
mgmt_cmd_complete(struct sock * sk,u16 index,u16 cmd,u8 status,void * rp,size_t rp_len)169 int 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(sizeof(*hdr) + sizeof(*ev) + rp_len, GFP_KERNEL);
180 if (!skb)
181 return -ENOMEM;
182
183 hdr = skb_put(skb, 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, 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(hdr->index, hci_sock_get_cookie(sk),
197 MGMT_EV_CMD_COMPLETE,
198 sizeof(*ev) + rp_len, 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, mskb,
210 HCI_SOCK_TRUSTED, NULL);
211 kfree_skb(mskb);
212 }
213
214 return err;
215 }
216
mgmt_pending_find(unsigned short channel,u16 opcode,struct hci_dev * hdev)217 struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
218 struct hci_dev *hdev)
219 {
220 struct mgmt_pending_cmd *cmd;
221
222 list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
223 if (hci_sock_get_channel(cmd->sk) != channel)
224 continue;
225 if (cmd->opcode == opcode)
226 return cmd;
227 }
228
229 return NULL;
230 }
231
mgmt_pending_foreach(u16 opcode,struct hci_dev * hdev,void (* cb)(struct mgmt_pending_cmd * cmd,void * data),void * data)232 void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
233 void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
234 void *data)
235 {
236 struct mgmt_pending_cmd *cmd, *tmp;
237
238 list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
239 if (opcode > 0 && cmd->opcode != opcode)
240 continue;
241
242 cb(cmd, data);
243 }
244 }
245
mgmt_pending_new(struct sock * sk,u16 opcode,struct hci_dev * hdev,void * data,u16 len)246 struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
247 struct hci_dev *hdev,
248 void *data, u16 len)
249 {
250 struct mgmt_pending_cmd *cmd;
251
252 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
253 if (!cmd)
254 return NULL;
255
256 cmd->opcode = opcode;
257 cmd->index = hdev->id;
258
259 cmd->param = kmemdup(data, len, GFP_KERNEL);
260 if (!cmd->param) {
261 kfree(cmd);
262 return NULL;
263 }
264
265 cmd->param_len = len;
266
267 cmd->sk = sk;
268 sock_hold(sk);
269
270 return cmd;
271 }
272
mgmt_pending_add(struct sock * sk,u16 opcode,struct hci_dev * hdev,void * data,u16 len)273 struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
274 struct hci_dev *hdev,
275 void *data, u16 len)
276 {
277 struct mgmt_pending_cmd *cmd;
278
279 cmd = mgmt_pending_new(sk, opcode, hdev, data, len);
280 if (!cmd)
281 return NULL;
282
283 list_add_tail(&cmd->list, &hdev->mgmt_pending);
284
285 return cmd;
286 }
287
mgmt_pending_free(struct mgmt_pending_cmd * cmd)288 void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
289 {
290 sock_put(cmd->sk);
291 kfree(cmd->param);
292 kfree(cmd);
293 }
294
mgmt_pending_remove(struct mgmt_pending_cmd * cmd)295 void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
296 {
297 list_del(&cmd->list);
298 mgmt_pending_free(cmd);
299 }
300
mgmt_mesh_foreach(struct hci_dev * hdev,void (* cb)(struct mgmt_mesh_tx * mesh_tx,void * data),void * data,struct sock * sk)301 void mgmt_mesh_foreach(struct hci_dev *hdev,
302 void (*cb)(struct mgmt_mesh_tx *mesh_tx, void *data),
303 void *data, struct sock *sk)
304 {
305 struct mgmt_mesh_tx *mesh_tx, *tmp;
306
307 list_for_each_entry_safe(mesh_tx, tmp, &hdev->mgmt_pending, list) {
308 if (!sk || mesh_tx->sk == sk)
309 cb(mesh_tx, data);
310 }
311 }
312
mgmt_mesh_next(struct hci_dev * hdev,struct sock * sk)313 struct mgmt_mesh_tx *mgmt_mesh_next(struct hci_dev *hdev, struct sock *sk)
314 {
315 struct mgmt_mesh_tx *mesh_tx;
316
317 if (list_empty(&hdev->mesh_pending))
318 return NULL;
319
320 list_for_each_entry(mesh_tx, &hdev->mesh_pending, list) {
321 if (!sk || mesh_tx->sk == sk)
322 return mesh_tx;
323 }
324
325 return NULL;
326 }
327
mgmt_mesh_find(struct hci_dev * hdev,u8 handle)328 struct mgmt_mesh_tx *mgmt_mesh_find(struct hci_dev *hdev, u8 handle)
329 {
330 struct mgmt_mesh_tx *mesh_tx;
331
332 if (list_empty(&hdev->mesh_pending))
333 return NULL;
334
335 list_for_each_entry(mesh_tx, &hdev->mesh_pending, list) {
336 if (mesh_tx->handle == handle)
337 return mesh_tx;
338 }
339
340 return NULL;
341 }
342
mgmt_mesh_add(struct sock * sk,struct hci_dev * hdev,void * data,u16 len)343 struct mgmt_mesh_tx *mgmt_mesh_add(struct sock *sk, struct hci_dev *hdev,
344 void *data, u16 len)
345 {
346 struct mgmt_mesh_tx *mesh_tx;
347
348 mesh_tx = kzalloc(sizeof(*mesh_tx), GFP_KERNEL);
349 if (!mesh_tx)
350 return NULL;
351
352 hdev->mesh_send_ref++;
353 if (!hdev->mesh_send_ref)
354 hdev->mesh_send_ref++;
355
356 mesh_tx->handle = hdev->mesh_send_ref;
357 mesh_tx->index = hdev->id;
358 memcpy(mesh_tx->param, data, len);
359 mesh_tx->param_len = len;
360 mesh_tx->sk = sk;
361 sock_hold(sk);
362
363 list_add_tail(&mesh_tx->list, &hdev->mesh_pending);
364
365 return mesh_tx;
366 }
367
mgmt_mesh_remove(struct mgmt_mesh_tx * mesh_tx)368 void mgmt_mesh_remove(struct mgmt_mesh_tx *mesh_tx)
369 {
370 list_del(&mesh_tx->list);
371 sock_put(mesh_tx->sk);
372 kfree(mesh_tx);
373 }
374