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, HCI_OP_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, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
101 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
103 struct hci_cp_disconnect cp;
107 conn->state = BT_DISCONN;
109 cp.handle = cpu_to_le16(conn->handle);
111 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
114 void hci_add_sco(struct hci_conn *conn, __u16 handle)
116 struct hci_dev *hdev = conn->hdev;
117 struct hci_cp_add_sco cp;
121 conn->state = BT_CONNECT;
124 cp.handle = cpu_to_le16(handle);
125 cp.pkt_type = cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
127 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
130 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
132 struct hci_dev *hdev = conn->hdev;
133 struct hci_cp_setup_sync_conn cp;
137 conn->state = BT_CONNECT;
140 cp.handle = cpu_to_le16(handle);
141 cp.pkt_type = cpu_to_le16(hdev->esco_type);
143 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
144 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
145 cp.max_latency = cpu_to_le16(0xffff);
146 cp.voice_setting = cpu_to_le16(hdev->voice_setting);
147 cp.retrans_effort = 0xff;
149 hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
152 static void hci_conn_timeout(unsigned long arg)
154 struct hci_conn *conn = (void *) arg;
155 struct hci_dev *hdev = conn->hdev;
157 BT_DBG("conn %p state %d", conn, conn->state);
159 if (atomic_read(&conn->refcnt))
164 switch (conn->state) {
166 if (conn->type == ACL_LINK)
167 hci_acl_connect_cancel(conn);
169 hci_acl_disconn(conn, 0x13);
172 hci_acl_disconn(conn, 0x13);
175 conn->state = BT_CLOSED;
179 hci_dev_unlock(hdev);
182 static void hci_conn_idle(unsigned long arg)
184 struct hci_conn *conn = (void *) arg;
186 BT_DBG("conn %p mode %d", conn, conn->mode);
188 hci_conn_enter_sniff_mode(conn);
191 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
193 struct hci_conn *conn;
195 BT_DBG("%s dst %s", hdev->name, batostr(dst));
197 conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
201 bacpy(&conn->dst, dst);
204 conn->mode = HCI_CM_ACTIVE;
205 conn->state = BT_OPEN;
207 conn->power_save = 1;
209 skb_queue_head_init(&conn->data_q);
211 setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
212 setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
214 atomic_set(&conn->refcnt, 0);
218 tasklet_disable(&hdev->tx_task);
220 hci_conn_hash_add(hdev, conn);
222 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
224 hci_conn_add_sysfs(conn);
226 tasklet_enable(&hdev->tx_task);
231 int hci_conn_del(struct hci_conn *conn)
233 struct hci_dev *hdev = conn->hdev;
235 BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
237 del_timer(&conn->idle_timer);
239 del_timer(&conn->disc_timer);
241 if (conn->type == ACL_LINK) {
242 struct hci_conn *sco = conn->link;
247 hdev->acl_cnt += conn->sent;
249 struct hci_conn *acl = conn->link;
256 tasklet_disable(&hdev->tx_task);
257 hci_conn_hash_del(hdev, conn);
259 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
260 tasklet_enable(&hdev->tx_task);
261 skb_queue_purge(&conn->data_q);
262 hci_conn_del_sysfs(conn);
268 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
270 int use_src = bacmp(src, BDADDR_ANY);
271 struct hci_dev *hdev = NULL;
274 BT_DBG("%s -> %s", batostr(src), batostr(dst));
276 read_lock_bh(&hci_dev_list_lock);
278 list_for_each(p, &hci_dev_list) {
279 struct hci_dev *d = list_entry(p, struct hci_dev, list);
281 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
285 * No source address - find interface with bdaddr != dst
286 * Source address - find interface with bdaddr == src
290 if (!bacmp(&d->bdaddr, src)) {
294 if (bacmp(&d->bdaddr, dst)) {
301 hdev = hci_dev_hold(hdev);
303 read_unlock_bh(&hci_dev_list_lock);
306 EXPORT_SYMBOL(hci_get_route);
308 /* Create SCO or ACL connection.
309 * Device _must_ be locked */
310 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
312 struct hci_conn *acl;
313 struct hci_conn *sco;
315 BT_DBG("%s dst %s", hdev->name, batostr(dst));
317 if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
318 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
324 if (acl->state == BT_OPEN || acl->state == BT_CLOSED)
325 hci_acl_connect(acl);
327 if (type == ACL_LINK)
330 if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
331 if (!(sco = hci_conn_add(hdev, type, dst))) {
342 if (acl->state == BT_CONNECTED &&
343 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
344 if (lmp_esco_capable(hdev))
345 hci_setup_sync(sco, acl->handle);
347 hci_add_sco(sco, acl->handle);
352 EXPORT_SYMBOL(hci_connect);
354 /* Authenticate remote device */
355 int hci_conn_auth(struct hci_conn *conn)
357 BT_DBG("conn %p", conn);
359 if (conn->link_mode & HCI_LM_AUTH)
362 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
363 struct hci_cp_auth_requested cp;
364 cp.handle = cpu_to_le16(conn->handle);
365 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, sizeof(cp), &cp);
369 EXPORT_SYMBOL(hci_conn_auth);
371 /* Enable encryption */
372 int hci_conn_encrypt(struct hci_conn *conn)
374 BT_DBG("conn %p", conn);
376 if (conn->link_mode & HCI_LM_ENCRYPT)
379 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
382 if (hci_conn_auth(conn)) {
383 struct hci_cp_set_conn_encrypt cp;
384 cp.handle = cpu_to_le16(conn->handle);
386 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), &cp);
390 EXPORT_SYMBOL(hci_conn_encrypt);
392 /* Change link key */
393 int hci_conn_change_link_key(struct hci_conn *conn)
395 BT_DBG("conn %p", conn);
397 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
398 struct hci_cp_change_conn_link_key cp;
399 cp.handle = cpu_to_le16(conn->handle);
400 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp);
404 EXPORT_SYMBOL(hci_conn_change_link_key);
407 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
409 BT_DBG("conn %p", conn);
411 if (!role && conn->link_mode & HCI_LM_MASTER)
414 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
415 struct hci_cp_switch_role cp;
416 bacpy(&cp.bdaddr, &conn->dst);
418 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
422 EXPORT_SYMBOL(hci_conn_switch_role);
424 /* Enter active mode */
425 void hci_conn_enter_active_mode(struct hci_conn *conn)
427 struct hci_dev *hdev = conn->hdev;
429 BT_DBG("conn %p mode %d", conn, conn->mode);
431 if (test_bit(HCI_RAW, &hdev->flags))
434 if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
437 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
438 struct hci_cp_exit_sniff_mode cp;
439 cp.handle = cpu_to_le16(conn->handle);
440 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
444 if (hdev->idle_timeout > 0)
445 mod_timer(&conn->idle_timer,
446 jiffies + msecs_to_jiffies(hdev->idle_timeout));
449 /* Enter sniff mode */
450 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
452 struct hci_dev *hdev = conn->hdev;
454 BT_DBG("conn %p mode %d", conn, conn->mode);
456 if (test_bit(HCI_RAW, &hdev->flags))
459 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
462 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
465 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
466 struct hci_cp_sniff_subrate cp;
467 cp.handle = cpu_to_le16(conn->handle);
468 cp.max_latency = cpu_to_le16(0);
469 cp.min_remote_timeout = cpu_to_le16(0);
470 cp.min_local_timeout = cpu_to_le16(0);
471 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
474 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
475 struct hci_cp_sniff_mode cp;
476 cp.handle = cpu_to_le16(conn->handle);
477 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
478 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
479 cp.attempt = cpu_to_le16(4);
480 cp.timeout = cpu_to_le16(1);
481 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
485 /* Drop all connection on the device */
486 void hci_conn_hash_flush(struct hci_dev *hdev)
488 struct hci_conn_hash *h = &hdev->conn_hash;
491 BT_DBG("hdev %s", hdev->name);
494 while (p != &h->list) {
497 c = list_entry(p, struct hci_conn, list);
500 c->state = BT_CLOSED;
502 hci_proto_disconn_ind(c, 0x16);
507 /* Check pending connect attempts */
508 void hci_conn_check_pending(struct hci_dev *hdev)
510 struct hci_conn *conn;
512 BT_DBG("hdev %s", hdev->name);
516 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
518 hci_acl_connect(conn);
520 hci_dev_unlock(hdev);
523 int hci_get_conn_list(void __user *arg)
525 struct hci_conn_list_req req, *cl;
526 struct hci_conn_info *ci;
527 struct hci_dev *hdev;
529 int n = 0, size, err;
531 if (copy_from_user(&req, arg, sizeof(req)))
534 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
537 size = sizeof(req) + req.conn_num * sizeof(*ci);
539 if (!(cl = kmalloc(size, GFP_KERNEL)))
542 if (!(hdev = hci_dev_get(req.dev_id))) {
549 hci_dev_lock_bh(hdev);
550 list_for_each(p, &hdev->conn_hash.list) {
551 register struct hci_conn *c;
552 c = list_entry(p, struct hci_conn, list);
554 bacpy(&(ci + n)->bdaddr, &c->dst);
555 (ci + n)->handle = c->handle;
556 (ci + n)->type = c->type;
557 (ci + n)->out = c->out;
558 (ci + n)->state = c->state;
559 (ci + n)->link_mode = c->link_mode;
560 if (++n >= req.conn_num)
563 hci_dev_unlock_bh(hdev);
565 cl->dev_id = hdev->id;
567 size = sizeof(req) + n * sizeof(*ci);
571 err = copy_to_user(arg, cl, size);
574 return err ? -EFAULT : 0;
577 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
579 struct hci_conn_info_req req;
580 struct hci_conn_info ci;
581 struct hci_conn *conn;
582 char __user *ptr = arg + sizeof(req);
584 if (copy_from_user(&req, arg, sizeof(req)))
587 hci_dev_lock_bh(hdev);
588 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
590 bacpy(&ci.bdaddr, &conn->dst);
591 ci.handle = conn->handle;
592 ci.type = conn->type;
594 ci.state = conn->state;
595 ci.link_mode = conn->link_mode;
597 hci_dev_unlock_bh(hdev);
602 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;