net/bluetooth/hci_conn.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4
   5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   6
   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;
  10
  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.
  19
  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.
  23 */
  24
  25 /* Bluetooth HCI connection handling. */
  26
  27 #include <linux/module.h>
  28
  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>
  39 #include <net/sock.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/unaligned.h>
  44
  45 #include <net/bluetooth/bluetooth.h>
  46 #include <net/bluetooth/hci_core.h>
  47
  48 #ifndef CONFIG_BT_HCI_CORE_DEBUG
  49 #undef  BT_DBG
  50 #define BT_DBG(D...)
  51 #endif
  52
  53 void hci_acl_connect(struct hci_conn *conn)
  54 {
  55         struct hci_dev *hdev = conn->hdev;
  56         struct inquiry_entry *ie;
  57         struct hci_cp_create_conn cp;
  58
  59         BT_DBG("%p", conn);
  60
  61         conn->state = BT_CONNECT;
  62         conn->out   = 1;
  63         conn->link_mode = HCI_LM_MASTER;
  64
  65         conn->attempt++;
  66
  67         memset(&cp, 0, sizeof(cp));
  68         bacpy(&cp.bdaddr, &conn->dst);
  69         cp.pscan_rep_mode = 0x02;
  70
  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);
  77         }
  78
  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;
  82         else
  83                 cp.role_switch  = 0x00;
  84
  85         hci_send_cmd(hdev, OGF_LINK_CTL, OCF_CREATE_CONN, sizeof(cp), &cp);
  86 }
  87
  88 static void hci_acl_connect_cancel(struct hci_conn *conn)
  89 {
  90         struct hci_cp_create_conn_cancel cp;
  91
  92         BT_DBG("%p", conn);
  93
  94         if (conn->hdev->hci_ver < 2)
  95                 return;
  96
  97         bacpy(&cp.bdaddr, &conn->dst);
  98         hci_send_cmd(conn->hdev, OGF_LINK_CTL,
  99                                 OCF_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 100 }
 101
 102 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
 103 {
 104         struct hci_cp_disconnect cp;
 105
 106         BT_DBG("%p", conn);
 107
 108         conn->state = BT_DISCONN;
 109
 110         cp.handle = __cpu_to_le16(conn->handle);
 111         cp.reason = reason;
 112         hci_send_cmd(conn->hdev, OGF_LINK_CTL,
 113                                 OCF_DISCONNECT, sizeof(cp), &cp);
 114 }
 115
 116 void hci_add_sco(struct hci_conn *conn, __u16 handle)
 117 {
 118         struct hci_dev *hdev = conn->hdev;
 119         struct hci_cp_add_sco cp;
 120
 121         BT_DBG("%p", conn);
 122
 123         conn->state = BT_CONNECT;
 124         conn->out = 1;
 125
 126         cp.pkt_type = __cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
 127         cp.handle   = __cpu_to_le16(handle);
 128
 129         hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ADD_SCO, sizeof(cp), &cp);
 130 }
 131
 132 static void hci_conn_timeout(unsigned long arg)
 133 {
 134         struct hci_conn *conn = (void *) arg;
 135         struct hci_dev *hdev = conn->hdev;
 136
 137         BT_DBG("conn %p state %d", conn, conn->state);
 138
 139         if (atomic_read(&conn->refcnt))
 140                 return;
 141
 142         hci_dev_lock(hdev);
 143
 144         switch (conn->state) {
 145         case BT_CONNECT:
 146                 hci_acl_connect_cancel(conn);
 147                 break;
 148         case BT_CONNECTED:
 149                 hci_acl_disconn(conn, 0x13);
 150                 break;
 151         default:
 152                 conn->state = BT_CLOSED;
 153                 break;
 154         }
 155
 156         hci_dev_unlock(hdev);
 157 }
 158
 159 static void hci_conn_idle(unsigned long arg)
 160 {
 161         struct hci_conn *conn = (void *) arg;
 162
 163         BT_DBG("conn %p mode %d", conn, conn->mode);
 164
 165         hci_conn_enter_sniff_mode(conn);
 166 }
 167
 168 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 169 {
 170         struct hci_conn *conn;
 171
 172         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 173
 174         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 175         if (!conn)
 176                 return NULL;
 177
 178         bacpy(&conn->dst, dst);
 179         conn->hdev   = hdev;
 180         conn->type   = type;
 181         conn->mode   = HCI_CM_ACTIVE;
 182         conn->state  = BT_OPEN;
 183
 184         conn->power_save = 1;
 185
 186         skb_queue_head_init(&conn->data_q);
 187
 188         init_timer(&conn->disc_timer);
 189         conn->disc_timer.function = hci_conn_timeout;
 190         conn->disc_timer.data = (unsigned long) conn;
 191
 192         init_timer(&conn->idle_timer);
 193         conn->idle_timer.function = hci_conn_idle;
 194         conn->idle_timer.data = (unsigned long) conn;
 195
 196         atomic_set(&conn->refcnt, 0);
 197
 198         hci_dev_hold(hdev);
 199
 200         tasklet_disable(&hdev->tx_task);
 201
 202         hci_conn_hash_add(hdev, conn);
 203         if (hdev->notify)
 204                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 205
 206         hci_conn_add_sysfs(conn);
 207
 208         tasklet_enable(&hdev->tx_task);
 209
 210         return conn;
 211 }
 212
 213 int hci_conn_del(struct hci_conn *conn)
 214 {
 215         struct hci_dev *hdev = conn->hdev;
 216
 217         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 218
 219         del_timer(&conn->idle_timer);
 220
 221         del_timer(&conn->disc_timer);
 222
 223         if (conn->type == SCO_LINK) {
 224                 struct hci_conn *acl = conn->link;
 225                 if (acl) {
 226                         acl->link = NULL;
 227                         hci_conn_put(acl);
 228                 }
 229         } else {
 230                 struct hci_conn *sco = conn->link;
 231                 if (sco)
 232                         sco->link = NULL;
 233
 234                 /* Unacked frames */
 235                 hdev->acl_cnt += conn->sent;
 236         }
 237
 238         tasklet_disable(&hdev->tx_task);
 239
 240         hci_conn_del_sysfs(conn);
 241
 242         hci_conn_hash_del(hdev, conn);
 243         if (hdev->notify)
 244                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 245
 246         tasklet_enable(&hdev->tx_task);
 247
 248         skb_queue_purge(&conn->data_q);
 249
 250         hci_dev_put(hdev);
 251
 252         /* will free via device release */
 253         put_device(&conn->dev);
 254
 255         return 0;
 256 }
 257
 258 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 259 {
 260         int use_src = bacmp(src, BDADDR_ANY);
 261         struct hci_dev *hdev = NULL;
 262         struct list_head *p;
 263
 264         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 265
 266         read_lock_bh(&hci_dev_list_lock);
 267
 268         list_for_each(p, &hci_dev_list) {
 269                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 270
 271                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 272                         continue;
 273
 274                 /* Simple routing:
 275                  *   No source address - find interface with bdaddr != dst
 276                  *   Source address    - find interface with bdaddr == src
 277                  */
 278
 279                 if (use_src) {
 280                         if (!bacmp(&d->bdaddr, src)) {
 281                                 hdev = d; break;
 282                         }
 283                 } else {
 284                         if (bacmp(&d->bdaddr, dst)) {
 285                                 hdev = d; break;
 286                         }
 287                 }
 288         }
 289
 290         if (hdev)
 291                 hdev = hci_dev_hold(hdev);
 292
 293         read_unlock_bh(&hci_dev_list_lock);
 294         return hdev;
 295 }
 296 EXPORT_SYMBOL(hci_get_route);
 297
 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)
 301 {
 302         struct hci_conn *acl;
 303
 304         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 305
 306         if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
 307                 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
 308                         return NULL;
 309         }
 310
 311         hci_conn_hold(acl);
 312
 313         if (acl->state == BT_OPEN || acl->state == BT_CLOSED)
 314                 hci_acl_connect(acl);
 315
 316         if (type == SCO_LINK) {
 317                 struct hci_conn *sco;
 318
 319                 if (!(sco = hci_conn_hash_lookup_ba(hdev, SCO_LINK, dst))) {
 320                         if (!(sco = hci_conn_add(hdev, SCO_LINK, dst))) {
 321                                 hci_conn_put(acl);
 322                                 return NULL;
 323                         }
 324                 }
 325                 acl->link = sco;
 326                 sco->link = acl;
 327
 328                 hci_conn_hold(sco);
 329
 330                 if (acl->state == BT_CONNECTED &&
 331                                 (sco->state == BT_OPEN || sco->state == BT_CLOSED))
 332                         hci_add_sco(sco, acl->handle);
 333
 334                 return sco;
 335         } else {
 336                 return acl;
 337         }
 338 }
 339 EXPORT_SYMBOL(hci_connect);
 340
 341 /* Authenticate remote device */
 342 int hci_conn_auth(struct hci_conn *conn)
 343 {
 344         BT_DBG("conn %p", conn);
 345
 346         if (conn->link_mode & HCI_LM_AUTH)
 347                 return 1;
 348
 349         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 350                 struct hci_cp_auth_requested cp;
 351                 cp.handle = __cpu_to_le16(conn->handle);
 352                 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_AUTH_REQUESTED, sizeof(cp), &cp);
 353         }
 354         return 0;
 355 }
 356 EXPORT_SYMBOL(hci_conn_auth);
 357
 358 /* Enable encryption */
 359 int hci_conn_encrypt(struct hci_conn *conn)
 360 {
 361         BT_DBG("conn %p", conn);
 362
 363         if (conn->link_mode & HCI_LM_ENCRYPT)
 364                 return 1;
 365
 366         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 367                 return 0;
 368
 369         if (hci_conn_auth(conn)) {
 370                 struct hci_cp_set_conn_encrypt cp;
 371                 cp.handle  = __cpu_to_le16(conn->handle);
 372                 cp.encrypt = 1;
 373                 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_SET_CONN_ENCRYPT, sizeof(cp), &cp);
 374         }
 375         return 0;
 376 }
 377 EXPORT_SYMBOL(hci_conn_encrypt);
 378
 379 /* Change link key */
 380 int hci_conn_change_link_key(struct hci_conn *conn)
 381 {
 382         BT_DBG("conn %p", conn);
 383
 384         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 385                 struct hci_cp_change_conn_link_key cp;
 386                 cp.handle = __cpu_to_le16(conn->handle);
 387                 hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp);
 388         }
 389         return 0;
 390 }
 391 EXPORT_SYMBOL(hci_conn_change_link_key);
 392
 393 /* Switch role */
 394 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
 395 {
 396         BT_DBG("conn %p", conn);
 397
 398         if (!role && conn->link_mode & HCI_LM_MASTER)
 399                 return 1;
 400
 401         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 402                 struct hci_cp_switch_role cp;
 403                 bacpy(&cp.bdaddr, &conn->dst);
 404                 cp.role = role;
 405                 hci_send_cmd(conn->hdev, OGF_LINK_POLICY, OCF_SWITCH_ROLE, sizeof(cp), &cp);
 406         }
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(hci_conn_switch_role);
 410
 411 /* Enter active mode */
 412 void hci_conn_enter_active_mode(struct hci_conn *conn)
 413 {
 414         struct hci_dev *hdev = conn->hdev;
 415
 416         BT_DBG("conn %p mode %d", conn, conn->mode);
 417
 418         if (test_bit(HCI_RAW, &hdev->flags))
 419                 return;
 420
 421         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 422                 goto timer;
 423
 424         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 425                 struct hci_cp_exit_sniff_mode cp;
 426                 cp.handle = __cpu_to_le16(conn->handle);
 427                 hci_send_cmd(hdev, OGF_LINK_POLICY,
 428                                 OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 429         }
 430
 431 timer:
 432         if (hdev->idle_timeout > 0)
 433                 mod_timer(&conn->idle_timer,
 434                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 435 }
 436
 437 /* Enter sniff mode */
 438 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 439 {
 440         struct hci_dev *hdev = conn->hdev;
 441
 442         BT_DBG("conn %p mode %d", conn, conn->mode);
 443
 444         if (test_bit(HCI_RAW, &hdev->flags))
 445                 return;
 446
 447         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 448                 return;
 449
 450         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 451                 return;
 452
 453         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 454                 struct hci_cp_sniff_subrate cp;
 455                 cp.handle             = __cpu_to_le16(conn->handle);
 456                 cp.max_latency        = __constant_cpu_to_le16(0);
 457                 cp.min_remote_timeout = __constant_cpu_to_le16(0);
 458                 cp.min_local_timeout  = __constant_cpu_to_le16(0);
 459                 hci_send_cmd(hdev, OGF_LINK_POLICY,
 460                                 OCF_SNIFF_SUBRATE, sizeof(cp), &cp);
 461         }
 462
 463         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 464                 struct hci_cp_sniff_mode cp;
 465                 cp.handle       = __cpu_to_le16(conn->handle);
 466                 cp.max_interval = __cpu_to_le16(hdev->sniff_max_interval);
 467                 cp.min_interval = __cpu_to_le16(hdev->sniff_min_interval);
 468                 cp.attempt      = __constant_cpu_to_le16(4);
 469                 cp.timeout      = __constant_cpu_to_le16(1);
 470                 hci_send_cmd(hdev, OGF_LINK_POLICY,
 471                                 OCF_SNIFF_MODE, sizeof(cp), &cp);
 472         }
 473 }
 474
 475 /* Drop all connection on the device */
 476 void hci_conn_hash_flush(struct hci_dev *hdev)
 477 {
 478         struct hci_conn_hash *h = &hdev->conn_hash;
 479         struct list_head *p;
 480
 481         BT_DBG("hdev %s", hdev->name);
 482
 483         p = h->list.next;
 484         while (p != &h->list) {
 485                 struct hci_conn *c;
 486
 487                 c = list_entry(p, struct hci_conn, list);
 488                 p = p->next;
 489
 490                 c->state = BT_CLOSED;
 491
 492                 hci_proto_disconn_ind(c, 0x16);
 493                 hci_conn_del(c);
 494         }
 495 }
 496
 497 int hci_get_conn_list(void __user *arg)
 498 {
 499         struct hci_conn_list_req req, *cl;
 500         struct hci_conn_info *ci;
 501         struct hci_dev *hdev;
 502         struct list_head *p;
 503         int n = 0, size, err;
 504
 505         if (copy_from_user(&req, arg, sizeof(req)))
 506                 return -EFAULT;
 507
 508         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 509                 return -EINVAL;
 510
 511         size = sizeof(req) + req.conn_num * sizeof(*ci);
 512
 513         if (!(cl = kmalloc(size, GFP_KERNEL)))
 514                 return -ENOMEM;
 515
 516         if (!(hdev = hci_dev_get(req.dev_id))) {
 517                 kfree(cl);
 518                 return -ENODEV;
 519         }
 520
 521         ci = cl->conn_info;
 522
 523         hci_dev_lock_bh(hdev);
 524         list_for_each(p, &hdev->conn_hash.list) {
 525                 register struct hci_conn *c;
 526                 c = list_entry(p, struct hci_conn, list);
 527
 528                 bacpy(&(ci + n)->bdaddr, &c->dst);
 529                 (ci + n)->handle = c->handle;
 530                 (ci + n)->type  = c->type;
 531                 (ci + n)->out   = c->out;
 532                 (ci + n)->state = c->state;
 533                 (ci + n)->link_mode = c->link_mode;
 534                 if (++n >= req.conn_num)
 535                         break;
 536         }
 537         hci_dev_unlock_bh(hdev);
 538
 539         cl->dev_id = hdev->id;
 540         cl->conn_num = n;
 541         size = sizeof(req) + n * sizeof(*ci);
 542
 543         hci_dev_put(hdev);
 544
 545         err = copy_to_user(arg, cl, size);
 546         kfree(cl);
 547
 548         return err ? -EFAULT : 0;
 549 }
 550
 551 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 552 {
 553         struct hci_conn_info_req req;
 554         struct hci_conn_info ci;
 555         struct hci_conn *conn;
 556         char __user *ptr = arg + sizeof(req);
 557
 558         if (copy_from_user(&req, arg, sizeof(req)))
 559                 return -EFAULT;
 560
 561         hci_dev_lock_bh(hdev);
 562         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 563         if (conn) {
 564                 bacpy(&ci.bdaddr, &conn->dst);
 565                 ci.handle = conn->handle;
 566                 ci.type  = conn->type;
 567                 ci.out   = conn->out;
 568                 ci.state = conn->state;
 569                 ci.link_mode = conn->link_mode;
 570         }
 571         hci_dev_unlock_bh(hdev);
 572
 573         if (!conn)
 574                 return -ENOENT;
 575
 576         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 577 }