2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
25 /* Bluetooth HCI connection handling. */
27 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/poll.h>
34 #include <linux/fcntl.h>
35 #include <linux/init.h>
36 #include <linux/skbuff.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
43 #include <asm/unaligned.h>
45 #include <net/bluetooth/bluetooth.h>
46 #include <net/bluetooth/hci_core.h>
48 #ifndef CONFIG_BT_HCI_CORE_DEBUG
53 void hci_acl_connect(struct hci_conn *conn)
55 struct hci_dev *hdev = conn->hdev;
56 struct inquiry_entry *ie;
57 struct hci_cp_create_conn cp;
61 conn->state = BT_CONNECT;
63 conn->link_mode = HCI_LM_MASTER;
67 memset(&cp, 0, sizeof(cp));
68 bacpy(&cp.bdaddr, &conn->dst);
69 cp.pscan_rep_mode = 0x02;
71 if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst)) &&
72 inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
73 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
74 cp.pscan_mode = ie->data.pscan_mode;
75 cp.clock_offset = ie->data.clock_offset | cpu_to_le16(0x8000);
76 memcpy(conn->dev_class, ie->data.dev_class, 3);
79 cp.pkt_type = cpu_to_le16(hdev->pkt_type & ACL_PTYPE_MASK);
80 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
81 cp.role_switch = 0x01;
83 cp.role_switch = 0x00;
85 hci_send_cmd(hdev, OGF_LINK_CTL, OCF_CREATE_CONN, sizeof(cp), &cp);
88 static void hci_acl_connect_cancel(struct hci_conn *conn)
90 struct hci_cp_create_conn_cancel cp;
94 if (conn->hdev->hci_ver < 2)
97 bacpy(&cp.bdaddr, &conn->dst);
98 hci_send_cmd(conn->hdev, OGF_LINK_CTL,
99 OCF_CREATE_CONN_CANCEL, sizeof(cp), &cp);
102 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
104 struct hci_cp_disconnect cp;
108 conn->state = BT_DISCONN;
110 cp.handle = cpu_to_le16(conn->handle);
112 hci_send_cmd(conn->hdev, OGF_LINK_CTL,
113 OCF_DISCONNECT, sizeof(cp), &cp);
116 void hci_add_sco(struct hci_conn *conn, __u16 handle)
118 struct hci_dev *hdev = conn->hdev;
119 struct hci_cp_add_sco cp;
123 conn->state = BT_CONNECT;
126 cp.handle = cpu_to_le16(handle);
127 cp.pkt_type = cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
129 hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ADD_SCO, sizeof(cp), &cp);
132 static void hci_conn_timeout(unsigned long arg)
134 struct hci_conn *conn = (void *) arg;
135 struct hci_dev *hdev = conn->hdev;
137 BT_DBG("conn %p state %d", conn, conn->state);
139 if (atomic_read(&conn->refcnt))
144 switch (conn->state) {
146 hci_acl_connect_cancel(conn);
149 hci_acl_disconn(conn, 0x13);
152 conn->state = BT_CLOSED;
156 hci_dev_unlock(hdev);
159 static void hci_conn_idle(unsigned long arg)
161 struct hci_conn *conn = (void *) arg;
163 BT_DBG("conn %p mode %d", conn, conn->mode);
165 hci_conn_enter_sniff_mode(conn);
168 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
170 struct hci_conn *conn;
172 BT_DBG("%s dst %s", hdev->name, batostr(dst));
174 conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
178 bacpy(&conn->dst, dst);
181 conn->mode = HCI_CM_ACTIVE;
182 conn->state = BT_OPEN;
184 conn->power_save = 1;
186 skb_queue_head_init(&conn->data_q);
188 init_timer(&conn->disc_timer);
189 conn->disc_timer.function = hci_conn_timeout;
190 conn->disc_timer.data = (unsigned long) conn;
192 init_timer(&conn->idle_timer);
193 conn->idle_timer.function = hci_conn_idle;
194 conn->idle_timer.data = (unsigned long) conn;
196 atomic_set(&conn->refcnt, 0);
200 tasklet_disable(&hdev->tx_task);
202 hci_conn_hash_add(hdev, conn);
204 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
206 hci_conn_add_sysfs(conn);
208 tasklet_enable(&hdev->tx_task);
213 int hci_conn_del(struct hci_conn *conn)
215 struct hci_dev *hdev = conn->hdev;
217 BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
219 del_timer(&conn->idle_timer);
221 del_timer(&conn->disc_timer);
223 if (conn->type == ACL_LINK) {
224 struct hci_conn *sco = conn->link;
229 hdev->acl_cnt += conn->sent;
231 struct hci_conn *acl = conn->link;
238 tasklet_disable(&hdev->tx_task);
240 hci_conn_del_sysfs(conn);
242 hci_conn_hash_del(hdev, conn);
244 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
246 tasklet_enable(&hdev->tx_task);
248 skb_queue_purge(&conn->data_q);
252 /* will free via device release */
253 put_device(&conn->dev);
258 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
260 int use_src = bacmp(src, BDADDR_ANY);
261 struct hci_dev *hdev = NULL;
264 BT_DBG("%s -> %s", batostr(src), batostr(dst));
266 read_lock_bh(&hci_dev_list_lock);
268 list_for_each(p, &hci_dev_list) {
269 struct hci_dev *d = list_entry(p, struct hci_dev, list);
271 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
275 * No source address - find interface with bdaddr != dst
276 * Source address - find interface with bdaddr == src
280 if (!bacmp(&d->bdaddr, src)) {
284 if (bacmp(&d->bdaddr, dst)) {
291 hdev = hci_dev_hold(hdev);
293 read_unlock_bh(&hci_dev_list_lock);
296 EXPORT_SYMBOL(hci_get_route);
298 /* Create SCO or ACL connection.
299 * Device _must_ be locked */
300 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
302 struct hci_conn *acl;
303 struct hci_conn *sco;
305 BT_DBG("%s dst %s", hdev->name, batostr(dst));
307 if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
308 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
314 if (acl->state == BT_OPEN || acl->state == BT_CLOSED)
315 hci_acl_connect(acl);
317 if (type == ACL_LINK)
320 if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
321 if (!(sco = hci_conn_add(hdev, type, dst))) {
332 if (acl->state == BT_CONNECTED &&
333 (sco->state == BT_OPEN || sco->state == BT_CLOSED))
334 hci_add_sco(sco, acl->handle);
338 EXPORT_SYMBOL(hci_connect);
340 /* Authenticate remote device */
341 int hci_conn_auth(struct hci_conn *conn)
343 BT_DBG("conn %p", conn);
345 if (conn->link_mode & HCI_LM_AUTH)
348 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
349 struct hci_cp_auth_requested cp;
350 cp.handle = cpu_to_le16(conn->handle);
351 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_AUTH_REQUESTED, sizeof(cp), &cp);
355 EXPORT_SYMBOL(hci_conn_auth);
357 /* Enable encryption */
358 int hci_conn_encrypt(struct hci_conn *conn)
360 BT_DBG("conn %p", conn);
362 if (conn->link_mode & HCI_LM_ENCRYPT)
365 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
368 if (hci_conn_auth(conn)) {
369 struct hci_cp_set_conn_encrypt cp;
370 cp.handle = cpu_to_le16(conn->handle);
372 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_SET_CONN_ENCRYPT, sizeof(cp), &cp);
376 EXPORT_SYMBOL(hci_conn_encrypt);
378 /* Change link key */
379 int hci_conn_change_link_key(struct hci_conn *conn)
381 BT_DBG("conn %p", conn);
383 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
384 struct hci_cp_change_conn_link_key cp;
385 cp.handle = cpu_to_le16(conn->handle);
386 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp);
390 EXPORT_SYMBOL(hci_conn_change_link_key);
393 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
395 BT_DBG("conn %p", conn);
397 if (!role && conn->link_mode & HCI_LM_MASTER)
400 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
401 struct hci_cp_switch_role cp;
402 bacpy(&cp.bdaddr, &conn->dst);
404 hci_send_cmd(conn->hdev, OGF_LINK_POLICY, OCF_SWITCH_ROLE, sizeof(cp), &cp);
408 EXPORT_SYMBOL(hci_conn_switch_role);
410 /* Enter active mode */
411 void hci_conn_enter_active_mode(struct hci_conn *conn)
413 struct hci_dev *hdev = conn->hdev;
415 BT_DBG("conn %p mode %d", conn, conn->mode);
417 if (test_bit(HCI_RAW, &hdev->flags))
420 if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
423 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
424 struct hci_cp_exit_sniff_mode cp;
425 cp.handle = cpu_to_le16(conn->handle);
426 hci_send_cmd(hdev, OGF_LINK_POLICY,
427 OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp);
431 if (hdev->idle_timeout > 0)
432 mod_timer(&conn->idle_timer,
433 jiffies + msecs_to_jiffies(hdev->idle_timeout));
436 /* Enter sniff mode */
437 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
439 struct hci_dev *hdev = conn->hdev;
441 BT_DBG("conn %p mode %d", conn, conn->mode);
443 if (test_bit(HCI_RAW, &hdev->flags))
446 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
449 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
452 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
453 struct hci_cp_sniff_subrate cp;
454 cp.handle = cpu_to_le16(conn->handle);
455 cp.max_latency = cpu_to_le16(0);
456 cp.min_remote_timeout = cpu_to_le16(0);
457 cp.min_local_timeout = cpu_to_le16(0);
458 hci_send_cmd(hdev, OGF_LINK_POLICY,
459 OCF_SNIFF_SUBRATE, sizeof(cp), &cp);
462 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
463 struct hci_cp_sniff_mode cp;
464 cp.handle = cpu_to_le16(conn->handle);
465 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
466 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
467 cp.attempt = cpu_to_le16(4);
468 cp.timeout = cpu_to_le16(1);
469 hci_send_cmd(hdev, OGF_LINK_POLICY,
470 OCF_SNIFF_MODE, sizeof(cp), &cp);
474 /* Drop all connection on the device */
475 void hci_conn_hash_flush(struct hci_dev *hdev)
477 struct hci_conn_hash *h = &hdev->conn_hash;
480 BT_DBG("hdev %s", hdev->name);
483 while (p != &h->list) {
486 c = list_entry(p, struct hci_conn, list);
489 c->state = BT_CLOSED;
491 hci_proto_disconn_ind(c, 0x16);
496 int hci_get_conn_list(void __user *arg)
498 struct hci_conn_list_req req, *cl;
499 struct hci_conn_info *ci;
500 struct hci_dev *hdev;
502 int n = 0, size, err;
504 if (copy_from_user(&req, arg, sizeof(req)))
507 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
510 size = sizeof(req) + req.conn_num * sizeof(*ci);
512 if (!(cl = kmalloc(size, GFP_KERNEL)))
515 if (!(hdev = hci_dev_get(req.dev_id))) {
522 hci_dev_lock_bh(hdev);
523 list_for_each(p, &hdev->conn_hash.list) {
524 register struct hci_conn *c;
525 c = list_entry(p, struct hci_conn, list);
527 bacpy(&(ci + n)->bdaddr, &c->dst);
528 (ci + n)->handle = c->handle;
529 (ci + n)->type = c->type;
530 (ci + n)->out = c->out;
531 (ci + n)->state = c->state;
532 (ci + n)->link_mode = c->link_mode;
533 if (++n >= req.conn_num)
536 hci_dev_unlock_bh(hdev);
538 cl->dev_id = hdev->id;
540 size = sizeof(req) + n * sizeof(*ci);
544 err = copy_to_user(arg, cl, size);
547 return err ? -EFAULT : 0;
550 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
552 struct hci_conn_info_req req;
553 struct hci_conn_info ci;
554 struct hci_conn *conn;
555 char __user *ptr = arg + sizeof(req);
557 if (copy_from_user(&req, arg, sizeof(req)))
560 hci_dev_lock_bh(hdev);
561 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
563 bacpy(&ci.bdaddr, &conn->dst);
564 ci.handle = conn->handle;
565 ci.type = conn->type;
567 ci.state = conn->state;
568 ci.link_mode = conn->link_mode;
570 hci_dev_unlock_bh(hdev);
575 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;