net/bluetooth/hci_conn.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
   4    Copyright 2023 NXP
   5
   6    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License version 2 as
  10    published by the Free Software Foundation;
  11
  12    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  13    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  15    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  16    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  17    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  19    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20
  21    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  22    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  23    SOFTWARE IS DISCLAIMED.
  24 */
  25
  26 /* Bluetooth HCI connection handling. */
  27
  28 #include <linux/export.h>
  29 #include <linux/debugfs.h>
  30
  31 #include <net/bluetooth/bluetooth.h>
  32 #include <net/bluetooth/hci_core.h>
  33 #include <net/bluetooth/l2cap.h>
  34 #include <net/bluetooth/iso.h>
  35 #include <net/bluetooth/mgmt.h>
  36
  37 #include "hci_request.h"
  38 #include "smp.h"
  39 #include "a2mp.h"
  40 #include "eir.h"
  41
  42 struct sco_param {
  43         u16 pkt_type;
  44         u16 max_latency;
  45         u8  retrans_effort;
  46 };
  47
  48 struct conn_handle_t {
  49         struct hci_conn *conn;
  50         __u16 handle;
  51 };
  52
  53 static const struct sco_param esco_param_cvsd[] = {
  54         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a,   0x01 }, /* S3 */
  55         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,   0x01 }, /* S2 */
  56         { EDR_ESCO_MASK | ESCO_EV3,   0x0007,   0x01 }, /* S1 */
  57         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0x01 }, /* D1 */
  58         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0x01 }, /* D0 */
  59 };
  60
  61 static const struct sco_param sco_param_cvsd[] = {
  62         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0xff }, /* D1 */
  63         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0xff }, /* D0 */
  64 };
  65
  66 static const struct sco_param esco_param_msbc[] = {
  67         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,   0x02 }, /* T2 */
  68         { EDR_ESCO_MASK | ESCO_EV3,   0x0008,   0x02 }, /* T1 */
  69 };
  70
  71 /* This function requires the caller holds hdev->lock */
  72 static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
  73 {
  74         struct hci_conn_params *params;
  75         struct hci_dev *hdev = conn->hdev;
  76         struct smp_irk *irk;
  77         bdaddr_t *bdaddr;
  78         u8 bdaddr_type;
  79
  80         bdaddr = &conn->dst;
  81         bdaddr_type = conn->dst_type;
  82
  83         /* Check if we need to convert to identity address */
  84         irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
  85         if (irk) {
  86                 bdaddr = &irk->bdaddr;
  87                 bdaddr_type = irk->addr_type;
  88         }
  89
  90         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
  91                                            bdaddr_type);
  92         if (!params)
  93                 return;
  94
  95         if (params->conn) {
  96                 hci_conn_drop(params->conn);
  97                 hci_conn_put(params->conn);
  98                 params->conn = NULL;
  99         }
 100
 101         if (!params->explicit_connect)
 102                 return;
 103
 104         /* If the status indicates successful cancellation of
 105          * the attempt (i.e. Unknown Connection Id) there's no point of
 106          * notifying failure since we'll go back to keep trying to
 107          * connect. The only exception is explicit connect requests
 108          * where a timeout + cancel does indicate an actual failure.
 109          */
 110         if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
 111                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 112                                     conn->dst_type, status);
 113
 114         /* The connection attempt was doing scan for new RPA, and is
 115          * in scan phase. If params are not associated with any other
 116          * autoconnect action, remove them completely. If they are, just unmark
 117          * them as waiting for connection, by clearing explicit_connect field.
 118          */
 119         params->explicit_connect = false;
 120
 121         hci_pend_le_list_del_init(params);
 122
 123         switch (params->auto_connect) {
 124         case HCI_AUTO_CONN_EXPLICIT:
 125                 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
 126                 /* return instead of break to avoid duplicate scan update */
 127                 return;
 128         case HCI_AUTO_CONN_DIRECT:
 129         case HCI_AUTO_CONN_ALWAYS:
 130                 hci_pend_le_list_add(params, &hdev->pend_le_conns);
 131                 break;
 132         case HCI_AUTO_CONN_REPORT:
 133                 hci_pend_le_list_add(params, &hdev->pend_le_reports);
 134                 break;
 135         default:
 136                 break;
 137         }
 138
 139         hci_update_passive_scan(hdev);
 140 }
 141
 142 static void hci_conn_cleanup(struct hci_conn *conn)
 143 {
 144         struct hci_dev *hdev = conn->hdev;
 145
 146         if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
 147                 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
 148
 149         if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
 150                 hci_remove_link_key(hdev, &conn->dst);
 151
 152         hci_chan_list_flush(conn);
 153
 154         hci_conn_hash_del(hdev, conn);
 155
 156         if (HCI_CONN_HANDLE_UNSET(conn->handle))
 157                 ida_free(&hdev->unset_handle_ida, conn->handle);
 158
 159         if (conn->cleanup)
 160                 conn->cleanup(conn);
 161
 162         if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 163                 switch (conn->setting & SCO_AIRMODE_MASK) {
 164                 case SCO_AIRMODE_CVSD:
 165                 case SCO_AIRMODE_TRANSP:
 166                         if (hdev->notify)
 167                                 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
 168                         break;
 169                 }
 170         } else {
 171                 if (hdev->notify)
 172                         hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 173         }
 174
 175         debugfs_remove_recursive(conn->debugfs);
 176
 177         hci_conn_del_sysfs(conn);
 178
 179         hci_dev_put(hdev);
 180 }
 181
 182 static void hci_acl_create_connection(struct hci_conn *conn)
 183 {
 184         struct hci_dev *hdev = conn->hdev;
 185         struct inquiry_entry *ie;
 186         struct hci_cp_create_conn cp;
 187
 188         BT_DBG("hcon %p", conn);
 189
 190         /* Many controllers disallow HCI Create Connection while it is doing
 191          * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
 192          * Connection. This may cause the MGMT discovering state to become false
 193          * without user space's request but it is okay since the MGMT Discovery
 194          * APIs do not promise that discovery should be done forever. Instead,
 195          * the user space monitors the status of MGMT discovering and it may
 196          * request for discovery again when this flag becomes false.
 197          */
 198         if (test_bit(HCI_INQUIRY, &hdev->flags)) {
 199                 /* Put this connection to "pending" state so that it will be
 200                  * executed after the inquiry cancel command complete event.
 201                  */
 202                 conn->state = BT_CONNECT2;
 203                 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
 204                 return;
 205         }
 206
 207         conn->state = BT_CONNECT;
 208         conn->out = true;
 209         conn->role = HCI_ROLE_MASTER;
 210
 211         conn->attempt++;
 212
 213         conn->link_policy = hdev->link_policy;
 214
 215         memset(&cp, 0, sizeof(cp));
 216         bacpy(&cp.bdaddr, &conn->dst);
 217         cp.pscan_rep_mode = 0x02;
 218
 219         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 220         if (ie) {
 221                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 222                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 223                         cp.pscan_mode     = ie->data.pscan_mode;
 224                         cp.clock_offset   = ie->data.clock_offset |
 225                                             cpu_to_le16(0x8000);
 226                 }
 227
 228                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 229         }
 230
 231         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 232         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 233                 cp.role_switch = 0x01;
 234         else
 235                 cp.role_switch = 0x00;
 236
 237         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 238 }
 239
 240 int hci_disconnect(struct hci_conn *conn, __u8 reason)
 241 {
 242         BT_DBG("hcon %p", conn);
 243
 244         /* When we are central of an established connection and it enters
 245          * the disconnect timeout, then go ahead and try to read the
 246          * current clock offset.  Processing of the result is done
 247          * within the event handling and hci_clock_offset_evt function.
 248          */
 249         if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 250             (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 251                 struct hci_dev *hdev = conn->hdev;
 252                 struct hci_cp_read_clock_offset clkoff_cp;
 253
 254                 clkoff_cp.handle = cpu_to_le16(conn->handle);
 255                 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 256                              &clkoff_cp);
 257         }
 258
 259         return hci_abort_conn(conn, reason);
 260 }
 261
 262 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 263 {
 264         struct hci_dev *hdev = conn->hdev;
 265         struct hci_cp_add_sco cp;
 266
 267         BT_DBG("hcon %p", conn);
 268
 269         conn->state = BT_CONNECT;
 270         conn->out = true;
 271
 272         conn->attempt++;
 273
 274         cp.handle   = cpu_to_le16(handle);
 275         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 276
 277         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 278 }
 279
 280 static bool find_next_esco_param(struct hci_conn *conn,
 281                                  const struct sco_param *esco_param, int size)
 282 {
 283         if (!conn->parent)
 284                 return false;
 285
 286         for (; conn->attempt <= size; conn->attempt++) {
 287                 if (lmp_esco_2m_capable(conn->parent) ||
 288                     (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
 289                         break;
 290                 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
 291                        conn, conn->attempt);
 292         }
 293
 294         return conn->attempt <= size;
 295 }
 296
 297 static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
 298 {
 299         int err;
 300         __u8 vnd_len, *vnd_data = NULL;
 301         struct hci_op_configure_data_path *cmd = NULL;
 302
 303         err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
 304                                           &vnd_data);
 305         if (err < 0)
 306                 goto error;
 307
 308         cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
 309         if (!cmd) {
 310                 err = -ENOMEM;
 311                 goto error;
 312         }
 313
 314         err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
 315         if (err < 0)
 316                 goto error;
 317
 318         cmd->vnd_len = vnd_len;
 319         memcpy(cmd->vnd_data, vnd_data, vnd_len);
 320
 321         cmd->direction = 0x00;
 322         __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
 323                               sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
 324
 325         cmd->direction = 0x01;
 326         err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
 327                                     sizeof(*cmd) + vnd_len, cmd,
 328                                     HCI_CMD_TIMEOUT);
 329 error:
 330
 331         kfree(cmd);
 332         kfree(vnd_data);
 333         return err;
 334 }
 335
 336 static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
 337 {
 338         struct conn_handle_t *conn_handle = data;
 339         struct hci_conn *conn = conn_handle->conn;
 340         __u16 handle = conn_handle->handle;
 341         struct hci_cp_enhanced_setup_sync_conn cp;
 342         const struct sco_param *param;
 343
 344         kfree(conn_handle);
 345
 346         bt_dev_dbg(hdev, "hcon %p", conn);
 347
 348         /* for offload use case, codec needs to configured before opening SCO */
 349         if (conn->codec.data_path)
 350                 configure_datapath_sync(hdev, &conn->codec);
 351
 352         conn->state = BT_CONNECT;
 353         conn->out = true;
 354
 355         conn->attempt++;
 356
 357         memset(&cp, 0x00, sizeof(cp));
 358
 359         cp.handle   = cpu_to_le16(handle);
 360
 361         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 362         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 363
 364         switch (conn->codec.id) {
 365         case BT_CODEC_MSBC:
 366                 if (!find_next_esco_param(conn, esco_param_msbc,
 367                                           ARRAY_SIZE(esco_param_msbc)))
 368                         return -EINVAL;
 369
 370                 param = &esco_param_msbc[conn->attempt - 1];
 371                 cp.tx_coding_format.id = 0x05;
 372                 cp.rx_coding_format.id = 0x05;
 373                 cp.tx_codec_frame_size = __cpu_to_le16(60);
 374                 cp.rx_codec_frame_size = __cpu_to_le16(60);
 375                 cp.in_bandwidth = __cpu_to_le32(32000);
 376                 cp.out_bandwidth = __cpu_to_le32(32000);
 377                 cp.in_coding_format.id = 0x04;
 378                 cp.out_coding_format.id = 0x04;
 379                 cp.in_coded_data_size = __cpu_to_le16(16);
 380                 cp.out_coded_data_size = __cpu_to_le16(16);
 381                 cp.in_pcm_data_format = 2;
 382                 cp.out_pcm_data_format = 2;
 383                 cp.in_pcm_sample_payload_msb_pos = 0;
 384                 cp.out_pcm_sample_payload_msb_pos = 0;
 385                 cp.in_data_path = conn->codec.data_path;
 386                 cp.out_data_path = conn->codec.data_path;
 387                 cp.in_transport_unit_size = 1;
 388                 cp.out_transport_unit_size = 1;
 389                 break;
 390
 391         case BT_CODEC_TRANSPARENT:
 392                 if (!find_next_esco_param(conn, esco_param_msbc,
 393                                           ARRAY_SIZE(esco_param_msbc)))
 394                         return false;
 395                 param = &esco_param_msbc[conn->attempt - 1];
 396                 cp.tx_coding_format.id = 0x03;
 397                 cp.rx_coding_format.id = 0x03;
 398                 cp.tx_codec_frame_size = __cpu_to_le16(60);
 399                 cp.rx_codec_frame_size = __cpu_to_le16(60);
 400                 cp.in_bandwidth = __cpu_to_le32(0x1f40);
 401                 cp.out_bandwidth = __cpu_to_le32(0x1f40);
 402                 cp.in_coding_format.id = 0x03;
 403                 cp.out_coding_format.id = 0x03;
 404                 cp.in_coded_data_size = __cpu_to_le16(16);
 405                 cp.out_coded_data_size = __cpu_to_le16(16);
 406                 cp.in_pcm_data_format = 2;
 407                 cp.out_pcm_data_format = 2;
 408                 cp.in_pcm_sample_payload_msb_pos = 0;
 409                 cp.out_pcm_sample_payload_msb_pos = 0;
 410                 cp.in_data_path = conn->codec.data_path;
 411                 cp.out_data_path = conn->codec.data_path;
 412                 cp.in_transport_unit_size = 1;
 413                 cp.out_transport_unit_size = 1;
 414                 break;
 415
 416         case BT_CODEC_CVSD:
 417                 if (conn->parent && lmp_esco_capable(conn->parent)) {
 418                         if (!find_next_esco_param(conn, esco_param_cvsd,
 419                                                   ARRAY_SIZE(esco_param_cvsd)))
 420                                 return -EINVAL;
 421                         param = &esco_param_cvsd[conn->attempt - 1];
 422                 } else {
 423                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 424                                 return -EINVAL;
 425                         param = &sco_param_cvsd[conn->attempt - 1];
 426                 }
 427                 cp.tx_coding_format.id = 2;
 428                 cp.rx_coding_format.id = 2;
 429                 cp.tx_codec_frame_size = __cpu_to_le16(60);
 430                 cp.rx_codec_frame_size = __cpu_to_le16(60);
 431                 cp.in_bandwidth = __cpu_to_le32(16000);
 432                 cp.out_bandwidth = __cpu_to_le32(16000);
 433                 cp.in_coding_format.id = 4;
 434                 cp.out_coding_format.id = 4;
 435                 cp.in_coded_data_size = __cpu_to_le16(16);
 436                 cp.out_coded_data_size = __cpu_to_le16(16);
 437                 cp.in_pcm_data_format = 2;
 438                 cp.out_pcm_data_format = 2;
 439                 cp.in_pcm_sample_payload_msb_pos = 0;
 440                 cp.out_pcm_sample_payload_msb_pos = 0;
 441                 cp.in_data_path = conn->codec.data_path;
 442                 cp.out_data_path = conn->codec.data_path;
 443                 cp.in_transport_unit_size = 16;
 444                 cp.out_transport_unit_size = 16;
 445                 break;
 446         default:
 447                 return -EINVAL;
 448         }
 449
 450         cp.retrans_effort = param->retrans_effort;
 451         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 452         cp.max_latency = __cpu_to_le16(param->max_latency);
 453
 454         if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 455                 return -EIO;
 456
 457         return 0;
 458 }
 459
 460 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
 461 {
 462         struct hci_dev *hdev = conn->hdev;
 463         struct hci_cp_setup_sync_conn cp;
 464         const struct sco_param *param;
 465
 466         bt_dev_dbg(hdev, "hcon %p", conn);
 467
 468         conn->state = BT_CONNECT;
 469         conn->out = true;
 470
 471         conn->attempt++;
 472
 473         cp.handle   = cpu_to_le16(handle);
 474
 475         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 476         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 477         cp.voice_setting  = cpu_to_le16(conn->setting);
 478
 479         switch (conn->setting & SCO_AIRMODE_MASK) {
 480         case SCO_AIRMODE_TRANSP:
 481                 if (!find_next_esco_param(conn, esco_param_msbc,
 482                                           ARRAY_SIZE(esco_param_msbc)))
 483                         return false;
 484                 param = &esco_param_msbc[conn->attempt - 1];
 485                 break;
 486         case SCO_AIRMODE_CVSD:
 487                 if (conn->parent && lmp_esco_capable(conn->parent)) {
 488                         if (!find_next_esco_param(conn, esco_param_cvsd,
 489                                                   ARRAY_SIZE(esco_param_cvsd)))
 490                                 return false;
 491                         param = &esco_param_cvsd[conn->attempt - 1];
 492                 } else {
 493                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 494                                 return false;
 495                         param = &sco_param_cvsd[conn->attempt - 1];
 496                 }
 497                 break;
 498         default:
 499                 return false;
 500         }
 501
 502         cp.retrans_effort = param->retrans_effort;
 503         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 504         cp.max_latency = __cpu_to_le16(param->max_latency);
 505
 506         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 507                 return false;
 508
 509         return true;
 510 }
 511
 512 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 513 {
 514         int result;
 515         struct conn_handle_t *conn_handle;
 516
 517         if (enhanced_sync_conn_capable(conn->hdev)) {
 518                 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
 519
 520                 if (!conn_handle)
 521                         return false;
 522
 523                 conn_handle->conn = conn;
 524                 conn_handle->handle = handle;
 525                 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
 526                                             conn_handle, NULL);
 527                 if (result < 0)
 528                         kfree(conn_handle);
 529
 530                 return result == 0;
 531         }
 532
 533         return hci_setup_sync_conn(conn, handle);
 534 }
 535
 536 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 537                       u16 to_multiplier)
 538 {
 539         struct hci_dev *hdev = conn->hdev;
 540         struct hci_conn_params *params;
 541         struct hci_cp_le_conn_update cp;
 542
 543         hci_dev_lock(hdev);
 544
 545         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 546         if (params) {
 547                 params->conn_min_interval = min;
 548                 params->conn_max_interval = max;
 549                 params->conn_latency = latency;
 550                 params->supervision_timeout = to_multiplier;
 551         }
 552
 553         hci_dev_unlock(hdev);
 554
 555         memset(&cp, 0, sizeof(cp));
 556         cp.handle               = cpu_to_le16(conn->handle);
 557         cp.conn_interval_min    = cpu_to_le16(min);
 558         cp.conn_interval_max    = cpu_to_le16(max);
 559         cp.conn_latency         = cpu_to_le16(latency);
 560         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 561         cp.min_ce_len           = cpu_to_le16(0x0000);
 562         cp.max_ce_len           = cpu_to_le16(0x0000);
 563
 564         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 565
 566         if (params)
 567                 return 0x01;
 568
 569         return 0x00;
 570 }
 571
 572 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 573                       __u8 ltk[16], __u8 key_size)
 574 {
 575         struct hci_dev *hdev = conn->hdev;
 576         struct hci_cp_le_start_enc cp;
 577
 578         BT_DBG("hcon %p", conn);
 579
 580         memset(&cp, 0, sizeof(cp));
 581
 582         cp.handle = cpu_to_le16(conn->handle);
 583         cp.rand = rand;
 584         cp.ediv = ediv;
 585         memcpy(cp.ltk, ltk, key_size);
 586
 587         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 588 }
 589
 590 /* Device _must_ be locked */
 591 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 592 {
 593         struct hci_link *link;
 594
 595         link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
 596         if (!link || !link->conn)
 597                 return;
 598
 599         BT_DBG("hcon %p", conn);
 600
 601         if (!status) {
 602                 if (lmp_esco_capable(conn->hdev))
 603                         hci_setup_sync(link->conn, conn->handle);
 604                 else
 605                         hci_add_sco(link->conn, conn->handle);
 606         } else {
 607                 hci_connect_cfm(link->conn, status);
 608                 hci_conn_del(link->conn);
 609         }
 610 }
 611
 612 static void hci_conn_timeout(struct work_struct *work)
 613 {
 614         struct hci_conn *conn = container_of(work, struct hci_conn,
 615                                              disc_work.work);
 616         int refcnt = atomic_read(&conn->refcnt);
 617
 618         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 619
 620         WARN_ON(refcnt < 0);
 621
 622         /* FIXME: It was observed that in pairing failed scenario, refcnt
 623          * drops below 0. Probably this is because l2cap_conn_del calls
 624          * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 625          * dropped. After that loop hci_chan_del is called which also drops
 626          * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 627          * otherwise drop it.
 628          */
 629         if (refcnt > 0)
 630                 return;
 631
 632         hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 633 }
 634
 635 /* Enter sniff mode */
 636 static void hci_conn_idle(struct work_struct *work)
 637 {
 638         struct hci_conn *conn = container_of(work, struct hci_conn,
 639                                              idle_work.work);
 640         struct hci_dev *hdev = conn->hdev;
 641
 642         BT_DBG("hcon %p mode %d", conn, conn->mode);
 643
 644         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 645                 return;
 646
 647         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 648                 return;
 649
 650         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 651                 struct hci_cp_sniff_subrate cp;
 652                 cp.handle             = cpu_to_le16(conn->handle);
 653                 cp.max_latency        = cpu_to_le16(0);
 654                 cp.min_remote_timeout = cpu_to_le16(0);
 655                 cp.min_local_timeout  = cpu_to_le16(0);
 656                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 657         }
 658
 659         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 660                 struct hci_cp_sniff_mode cp;
 661                 cp.handle       = cpu_to_le16(conn->handle);
 662                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 663                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 664                 cp.attempt      = cpu_to_le16(4);
 665                 cp.timeout      = cpu_to_le16(1);
 666                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 667         }
 668 }
 669
 670 static void hci_conn_auto_accept(struct work_struct *work)
 671 {
 672         struct hci_conn *conn = container_of(work, struct hci_conn,
 673                                              auto_accept_work.work);
 674
 675         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 676                      &conn->dst);
 677 }
 678
 679 static void le_disable_advertising(struct hci_dev *hdev)
 680 {
 681         if (ext_adv_capable(hdev)) {
 682                 struct hci_cp_le_set_ext_adv_enable cp;
 683
 684                 cp.enable = 0x00;
 685                 cp.num_of_sets = 0x00;
 686
 687                 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
 688                              &cp);
 689         } else {
 690                 u8 enable = 0x00;
 691                 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 692                              &enable);
 693         }
 694 }
 695
 696 static void le_conn_timeout(struct work_struct *work)
 697 {
 698         struct hci_conn *conn = container_of(work, struct hci_conn,
 699                                              le_conn_timeout.work);
 700         struct hci_dev *hdev = conn->hdev;
 701
 702         BT_DBG("");
 703
 704         /* We could end up here due to having done directed advertising,
 705          * so clean up the state if necessary. This should however only
 706          * happen with broken hardware or if low duty cycle was used
 707          * (which doesn't have a timeout of its own).
 708          */
 709         if (conn->role == HCI_ROLE_SLAVE) {
 710                 /* Disable LE Advertising */
 711                 le_disable_advertising(hdev);
 712                 hci_dev_lock(hdev);
 713                 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 714                 hci_dev_unlock(hdev);
 715                 return;
 716         }
 717
 718         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 719 }
 720
 721 struct iso_cig_params {
 722         struct hci_cp_le_set_cig_params cp;
 723         struct hci_cis_params cis[0x1f];
 724 };
 725
 726 struct iso_list_data {
 727         union {
 728                 u8  cig;
 729                 u8  big;
 730         };
 731         union {
 732                 u8  cis;
 733                 u8  bis;
 734                 u16 sync_handle;
 735         };
 736         int count;
 737         bool big_term;
 738         bool pa_sync_term;
 739         bool big_sync_term;
 740 };
 741
 742 static void bis_list(struct hci_conn *conn, void *data)
 743 {
 744         struct iso_list_data *d = data;
 745
 746         /* Skip if not broadcast/ANY address */
 747         if (bacmp(&conn->dst, BDADDR_ANY))
 748                 return;
 749
 750         if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
 751             d->bis != conn->iso_qos.bcast.bis)
 752                 return;
 753
 754         d->count++;
 755 }
 756
 757 static int terminate_big_sync(struct hci_dev *hdev, void *data)
 758 {
 759         struct iso_list_data *d = data;
 760
 761         bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
 762
 763         hci_disable_per_advertising_sync(hdev, d->bis);
 764         hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
 765
 766         /* Only terminate BIG if it has been created */
 767         if (!d->big_term)
 768                 return 0;
 769
 770         return hci_le_terminate_big_sync(hdev, d->big,
 771                                          HCI_ERROR_LOCAL_HOST_TERM);
 772 }
 773
 774 static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
 775 {
 776         kfree(data);
 777 }
 778
 779 static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
 780 {
 781         struct iso_list_data *d;
 782         int ret;
 783
 784         bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
 785                    conn->iso_qos.bcast.bis);
 786
 787         d = kzalloc(sizeof(*d), GFP_KERNEL);
 788         if (!d)
 789                 return -ENOMEM;
 790
 791         d->big = conn->iso_qos.bcast.big;
 792         d->bis = conn->iso_qos.bcast.bis;
 793         d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
 794
 795         ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
 796                                  terminate_big_destroy);
 797         if (ret)
 798                 kfree(d);
 799
 800         return ret;
 801 }
 802
 803 static int big_terminate_sync(struct hci_dev *hdev, void *data)
 804 {
 805         struct iso_list_data *d = data;
 806
 807         bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
 808                    d->sync_handle);
 809
 810         if (d->big_sync_term)
 811                 hci_le_big_terminate_sync(hdev, d->big);
 812
 813         if (d->pa_sync_term)
 814                 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
 815
 816         return 0;
 817 }
 818
 819 static void find_bis(struct hci_conn *conn, void *data)
 820 {
 821         struct iso_list_data *d = data;
 822
 823         /* Ignore if BIG doesn't match */
 824         if (d->big != conn->iso_qos.bcast.big)
 825                 return;
 826
 827         d->count++;
 828 }
 829
 830 static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
 831 {
 832         struct iso_list_data *d;
 833         int ret;
 834
 835         bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
 836
 837         d = kzalloc(sizeof(*d), GFP_KERNEL);
 838         if (!d)
 839                 return -ENOMEM;
 840
 841         memset(d, 0, sizeof(*d));
 842         d->big = big;
 843         d->sync_handle = conn->sync_handle;
 844
 845         if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
 846                 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
 847                                         HCI_CONN_PA_SYNC, d);
 848
 849                 if (!d->count)
 850                         d->pa_sync_term = true;
 851
 852                 d->count = 0;
 853         }
 854
 855         if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
 856                 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
 857                                         HCI_CONN_BIG_SYNC, d);
 858
 859                 if (!d->count)
 860                         d->big_sync_term = true;
 861         }
 862
 863         ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
 864                                  terminate_big_destroy);
 865         if (ret)
 866                 kfree(d);
 867
 868         return ret;
 869 }
 870
 871 /* Cleanup BIS connection
 872  *
 873  * Detects if there any BIS left connected in a BIG
 874  * broadcaster: Remove advertising instance and terminate BIG.
 875  * broadcaster receiver: Teminate BIG sync and terminate PA sync.
 876  */
 877 static void bis_cleanup(struct hci_conn *conn)
 878 {
 879         struct hci_dev *hdev = conn->hdev;
 880         struct hci_conn *bis;
 881
 882         bt_dev_dbg(hdev, "conn %p", conn);
 883
 884         if (conn->role == HCI_ROLE_MASTER) {
 885                 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
 886                         return;
 887
 888                 /* Check if ISO connection is a BIS and terminate advertising
 889                  * set and BIG if there are no other connections using it.
 890                  */
 891                 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
 892                 if (bis)
 893                         return;
 894
 895                 hci_le_terminate_big(hdev, conn);
 896         } else {
 897                 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
 898                                      conn);
 899         }
 900 }
 901
 902 static int remove_cig_sync(struct hci_dev *hdev, void *data)
 903 {
 904         u8 handle = PTR_UINT(data);
 905
 906         return hci_le_remove_cig_sync(hdev, handle);
 907 }
 908
 909 static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
 910 {
 911         bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
 912
 913         return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
 914                                   NULL);
 915 }
 916
 917 static void find_cis(struct hci_conn *conn, void *data)
 918 {
 919         struct iso_list_data *d = data;
 920
 921         /* Ignore broadcast or if CIG don't match */
 922         if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
 923                 return;
 924
 925         d->count++;
 926 }
 927
 928 /* Cleanup CIS connection:
 929  *
 930  * Detects if there any CIS left connected in a CIG and remove it.
 931  */
 932 static void cis_cleanup(struct hci_conn *conn)
 933 {
 934         struct hci_dev *hdev = conn->hdev;
 935         struct iso_list_data d;
 936
 937         if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
 938                 return;
 939
 940         memset(&d, 0, sizeof(d));
 941         d.cig = conn->iso_qos.ucast.cig;
 942
 943         /* Check if ISO connection is a CIS and remove CIG if there are
 944          * no other connections using it.
 945          */
 946         hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d);
 947         hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d);
 948         hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
 949         if (d.count)
 950                 return;
 951
 952         hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
 953 }
 954
 955 static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
 956 {
 957         return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
 958                                U16_MAX, GFP_ATOMIC);
 959 }
 960
 961 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 962                               u8 role, u16 handle)
 963 {
 964         struct hci_conn *conn;
 965
 966         bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
 967
 968         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 969         if (!conn)
 970                 return NULL;
 971
 972         bacpy(&conn->dst, dst);
 973         bacpy(&conn->src, &hdev->bdaddr);
 974         conn->handle = handle;
 975         conn->hdev  = hdev;
 976         conn->type  = type;
 977         conn->role  = role;
 978         conn->mode  = HCI_CM_ACTIVE;
 979         conn->state = BT_OPEN;
 980         conn->auth_type = HCI_AT_GENERAL_BONDING;
 981         conn->io_capability = hdev->io_capability;
 982         conn->remote_auth = 0xff;
 983         conn->key_type = 0xff;
 984         conn->rssi = HCI_RSSI_INVALID;
 985         conn->tx_power = HCI_TX_POWER_INVALID;
 986         conn->max_tx_power = HCI_TX_POWER_INVALID;
 987         conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
 988
 989         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 990         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 991
 992         /* Set Default Authenticated payload timeout to 30s */
 993         conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 994
 995         if (conn->role == HCI_ROLE_MASTER)
 996                 conn->out = true;
 997
 998         switch (type) {
 999         case ACL_LINK:
1000                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
1001                 break;
1002         case LE_LINK:
1003                 /* conn->src should reflect the local identity address */
1004                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1005                 break;
1006         case ISO_LINK:
1007                 /* conn->src should reflect the local identity address */
1008                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1009
1010                 /* set proper cleanup function */
1011                 if (!bacmp(dst, BDADDR_ANY))
1012                         conn->cleanup = bis_cleanup;
1013                 else if (conn->role == HCI_ROLE_MASTER)
1014                         conn->cleanup = cis_cleanup;
1015
1016                 break;
1017         case SCO_LINK:
1018                 if (lmp_esco_capable(hdev))
1019                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1020                                         (hdev->esco_type & EDR_ESCO_MASK);
1021                 else
1022                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1023                 break;
1024         case ESCO_LINK:
1025                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1026                 break;
1027         }
1028
1029         skb_queue_head_init(&conn->data_q);
1030
1031         INIT_LIST_HEAD(&conn->chan_list);
1032         INIT_LIST_HEAD(&conn->link_list);
1033
1034         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1035         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1036         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1037         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1038
1039         atomic_set(&conn->refcnt, 0);
1040
1041         hci_dev_hold(hdev);
1042
1043         hci_conn_hash_add(hdev, conn);
1044
1045         /* The SCO and eSCO connections will only be notified when their
1046          * setup has been completed. This is different to ACL links which
1047          * can be notified right away.
1048          */
1049         if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1050                 if (hdev->notify)
1051                         hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1052         }
1053
1054         hci_conn_init_sysfs(conn);
1055
1056         return conn;
1057 }
1058
1059 struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1060                                     bdaddr_t *dst, u8 role)
1061 {
1062         int handle;
1063
1064         bt_dev_dbg(hdev, "dst %pMR", dst);
1065
1066         handle = hci_conn_hash_alloc_unset(hdev);
1067         if (unlikely(handle < 0))
1068                 return NULL;
1069
1070         return hci_conn_add(hdev, type, dst, role, handle);
1071 }
1072
1073 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1074 {
1075         if (!reason)
1076                 reason = HCI_ERROR_REMOTE_USER_TERM;
1077
1078         /* Due to race, SCO/ISO conn might be not established yet at this point,
1079          * and nothing else will clean it up. In other cases it is done via HCI
1080          * events.
1081          */
1082         switch (conn->type) {
1083         case SCO_LINK:
1084         case ESCO_LINK:
1085                 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1086                         hci_conn_failed(conn, reason);
1087                 break;
1088         case ISO_LINK:
1089                 if (conn->state != BT_CONNECTED &&
1090                     !test_bit(HCI_CONN_CREATE_CIS, &conn->flags))
1091                         hci_conn_failed(conn, reason);
1092                 break;
1093         }
1094 }
1095
1096 static void hci_conn_unlink(struct hci_conn *conn)
1097 {
1098         struct hci_dev *hdev = conn->hdev;
1099
1100         bt_dev_dbg(hdev, "hcon %p", conn);
1101
1102         if (!conn->parent) {
1103                 struct hci_link *link, *t;
1104
1105                 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1106                         struct hci_conn *child = link->conn;
1107
1108                         hci_conn_unlink(child);
1109
1110                         /* If hdev is down it means
1111                          * hci_dev_close_sync/hci_conn_hash_flush is in progress
1112                          * and links don't need to be cleanup as all connections
1113                          * would be cleanup.
1114                          */
1115                         if (!test_bit(HCI_UP, &hdev->flags))
1116                                 continue;
1117
1118                         hci_conn_cleanup_child(child, conn->abort_reason);
1119                 }
1120
1121                 return;
1122         }
1123
1124         if (!conn->link)
1125                 return;
1126
1127         list_del_rcu(&conn->link->list);
1128         synchronize_rcu();
1129
1130         hci_conn_drop(conn->parent);
1131         hci_conn_put(conn->parent);
1132         conn->parent = NULL;
1133
1134         kfree(conn->link);
1135         conn->link = NULL;
1136 }
1137
1138 void hci_conn_del(struct hci_conn *conn)
1139 {
1140         struct hci_dev *hdev = conn->hdev;
1141
1142         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1143
1144         hci_conn_unlink(conn);
1145
1146         cancel_delayed_work_sync(&conn->disc_work);
1147         cancel_delayed_work_sync(&conn->auto_accept_work);
1148         cancel_delayed_work_sync(&conn->idle_work);
1149
1150         if (conn->type == ACL_LINK) {
1151                 /* Unacked frames */
1152                 hdev->acl_cnt += conn->sent;
1153         } else if (conn->type == LE_LINK) {
1154                 cancel_delayed_work(&conn->le_conn_timeout);
1155
1156                 if (hdev->le_pkts)
1157                         hdev->le_cnt += conn->sent;
1158                 else
1159                         hdev->acl_cnt += conn->sent;
1160         } else {
1161                 /* Unacked ISO frames */
1162                 if (conn->type == ISO_LINK) {
1163                         if (hdev->iso_pkts)
1164                                 hdev->iso_cnt += conn->sent;
1165                         else if (hdev->le_pkts)
1166                                 hdev->le_cnt += conn->sent;
1167                         else
1168                                 hdev->acl_cnt += conn->sent;
1169                 }
1170         }
1171
1172         if (conn->amp_mgr)
1173                 amp_mgr_put(conn->amp_mgr);
1174
1175         skb_queue_purge(&conn->data_q);
1176
1177         /* Remove the connection from the list and cleanup its remaining
1178          * state. This is a separate function since for some cases like
1179          * BT_CONNECT_SCAN we *only* want the cleanup part without the
1180          * rest of hci_conn_del.
1181          */
1182         hci_conn_cleanup(conn);
1183 }
1184
1185 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1186 {
1187         int use_src = bacmp(src, BDADDR_ANY);
1188         struct hci_dev *hdev = NULL, *d;
1189
1190         BT_DBG("%pMR -> %pMR", src, dst);
1191
1192         read_lock(&hci_dev_list_lock);
1193
1194         list_for_each_entry(d, &hci_dev_list, list) {
1195                 if (!test_bit(HCI_UP, &d->flags) ||
1196                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
1197                     d->dev_type != HCI_PRIMARY)
1198                         continue;
1199
1200                 /* Simple routing:
1201                  *   No source address - find interface with bdaddr != dst
1202                  *   Source address    - find interface with bdaddr == src
1203                  */
1204
1205                 if (use_src) {
1206                         bdaddr_t id_addr;
1207                         u8 id_addr_type;
1208
1209                         if (src_type == BDADDR_BREDR) {
1210                                 if (!lmp_bredr_capable(d))
1211                                         continue;
1212                                 bacpy(&id_addr, &d->bdaddr);
1213                                 id_addr_type = BDADDR_BREDR;
1214                         } else {
1215                                 if (!lmp_le_capable(d))
1216                                         continue;
1217
1218                                 hci_copy_identity_address(d, &id_addr,
1219                                                           &id_addr_type);
1220
1221                                 /* Convert from HCI to three-value type */
1222                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1223                                         id_addr_type = BDADDR_LE_PUBLIC;
1224                                 else
1225                                         id_addr_type = BDADDR_LE_RANDOM;
1226                         }
1227
1228                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1229                                 hdev = d; break;
1230                         }
1231                 } else {
1232                         if (bacmp(&d->bdaddr, dst)) {
1233                                 hdev = d; break;
1234                         }
1235                 }
1236         }
1237
1238         if (hdev)
1239                 hdev = hci_dev_hold(hdev);
1240
1241         read_unlock(&hci_dev_list_lock);
1242         return hdev;
1243 }
1244 EXPORT_SYMBOL(hci_get_route);
1245
1246 /* This function requires the caller holds hdev->lock */
1247 static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1248 {
1249         struct hci_dev *hdev = conn->hdev;
1250
1251         hci_connect_le_scan_cleanup(conn, status);
1252
1253         /* Enable advertising in case this was a failed connection
1254          * attempt as a peripheral.
1255          */
1256         hci_enable_advertising(hdev);
1257 }
1258
1259 /* This function requires the caller holds hdev->lock */
1260 void hci_conn_failed(struct hci_conn *conn, u8 status)
1261 {
1262         struct hci_dev *hdev = conn->hdev;
1263
1264         bt_dev_dbg(hdev, "status 0x%2.2x", status);
1265
1266         switch (conn->type) {
1267         case LE_LINK:
1268                 hci_le_conn_failed(conn, status);
1269                 break;
1270         case ACL_LINK:
1271                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
1272                                     conn->dst_type, status);
1273                 break;
1274         }
1275
1276         /* In case of BIG/PA sync failed, clear conn flags so that
1277          * the conns will be correctly cleaned up by ISO layer
1278          */
1279         test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1280         test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1281
1282         conn->state = BT_CLOSED;
1283         hci_connect_cfm(conn, status);
1284         hci_conn_del(conn);
1285 }
1286
1287 /* This function requires the caller holds hdev->lock */
1288 u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1289 {
1290         struct hci_dev *hdev = conn->hdev;
1291
1292         bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1293
1294         if (conn->handle == handle)
1295                 return 0;
1296
1297         if (handle > HCI_CONN_HANDLE_MAX) {
1298                 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1299                            handle, HCI_CONN_HANDLE_MAX);
1300                 return HCI_ERROR_INVALID_PARAMETERS;
1301         }
1302
1303         /* If abort_reason has been sent it means the connection is being
1304          * aborted and the handle shall not be changed.
1305          */
1306         if (conn->abort_reason)
1307                 return conn->abort_reason;
1308
1309         if (HCI_CONN_HANDLE_UNSET(conn->handle))
1310                 ida_free(&hdev->unset_handle_ida, conn->handle);
1311
1312         conn->handle = handle;
1313
1314         return 0;
1315 }
1316
1317 static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
1318 {
1319         struct hci_conn *conn;
1320         u16 handle = PTR_UINT(data);
1321
1322         conn = hci_conn_hash_lookup_handle(hdev, handle);
1323         if (!conn)
1324                 return;
1325
1326         bt_dev_dbg(hdev, "err %d", err);
1327
1328         hci_dev_lock(hdev);
1329
1330         if (!err) {
1331                 hci_connect_le_scan_cleanup(conn, 0x00);
1332                 goto done;
1333         }
1334
1335         /* Check if connection is still pending */
1336         if (conn != hci_lookup_le_connect(hdev))
1337                 goto done;
1338
1339         /* Flush to make sure we send create conn cancel command if needed */
1340         flush_delayed_work(&conn->le_conn_timeout);
1341         hci_conn_failed(conn, bt_status(err));
1342
1343 done:
1344         hci_dev_unlock(hdev);
1345 }
1346
1347 static int hci_connect_le_sync(struct hci_dev *hdev, void *data)
1348 {
1349         struct hci_conn *conn;
1350         u16 handle = PTR_UINT(data);
1351
1352         conn = hci_conn_hash_lookup_handle(hdev, handle);
1353         if (!conn)
1354                 return 0;
1355
1356         bt_dev_dbg(hdev, "conn %p", conn);
1357
1358         clear_bit(HCI_CONN_SCANNING, &conn->flags);
1359         conn->state = BT_CONNECT;
1360
1361         return hci_le_create_conn_sync(hdev, conn);
1362 }
1363
1364 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1365                                 u8 dst_type, bool dst_resolved, u8 sec_level,
1366                                 u16 conn_timeout, u8 role)
1367 {
1368         struct hci_conn *conn;
1369         struct smp_irk *irk;
1370         int err;
1371
1372         /* Let's make sure that le is enabled.*/
1373         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1374                 if (lmp_le_capable(hdev))
1375                         return ERR_PTR(-ECONNREFUSED);
1376
1377                 return ERR_PTR(-EOPNOTSUPP);
1378         }
1379
1380         /* Since the controller supports only one LE connection attempt at a
1381          * time, we return -EBUSY if there is any connection attempt running.
1382          */
1383         if (hci_lookup_le_connect(hdev))
1384                 return ERR_PTR(-EBUSY);
1385
1386         /* If there's already a connection object but it's not in
1387          * scanning state it means it must already be established, in
1388          * which case we can't do anything else except report a failure
1389          * to connect.
1390          */
1391         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1392         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1393                 return ERR_PTR(-EBUSY);
1394         }
1395
1396         /* Check if the destination address has been resolved by the controller
1397          * since if it did then the identity address shall be used.
1398          */
1399         if (!dst_resolved) {
1400                 /* When given an identity address with existing identity
1401                  * resolving key, the connection needs to be established
1402                  * to a resolvable random address.
1403                  *
1404                  * Storing the resolvable random address is required here
1405                  * to handle connection failures. The address will later
1406                  * be resolved back into the original identity address
1407                  * from the connect request.
1408                  */
1409                 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1410                 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1411                         dst = &irk->rpa;
1412                         dst_type = ADDR_LE_DEV_RANDOM;
1413                 }
1414         }
1415
1416         if (conn) {
1417                 bacpy(&conn->dst, dst);
1418         } else {
1419                 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1420                 if (!conn)
1421                         return ERR_PTR(-ENOMEM);
1422                 hci_conn_hold(conn);
1423                 conn->pending_sec_level = sec_level;
1424         }
1425
1426         conn->dst_type = dst_type;
1427         conn->sec_level = BT_SECURITY_LOW;
1428         conn->conn_timeout = conn_timeout;
1429
1430         err = hci_cmd_sync_queue(hdev, hci_connect_le_sync,
1431                                  UINT_PTR(conn->handle),
1432                                  create_le_conn_complete);
1433         if (err) {
1434                 hci_conn_del(conn);
1435                 return ERR_PTR(err);
1436         }
1437
1438         return conn;
1439 }
1440
1441 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1442 {
1443         struct hci_conn *conn;
1444
1445         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1446         if (!conn)
1447                 return false;
1448
1449         if (conn->state != BT_CONNECTED)
1450                 return false;
1451
1452         return true;
1453 }
1454
1455 /* This function requires the caller holds hdev->lock */
1456 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1457                                         bdaddr_t *addr, u8 addr_type)
1458 {
1459         struct hci_conn_params *params;
1460
1461         if (is_connected(hdev, addr, addr_type))
1462                 return -EISCONN;
1463
1464         params = hci_conn_params_lookup(hdev, addr, addr_type);
1465         if (!params) {
1466                 params = hci_conn_params_add(hdev, addr, addr_type);
1467                 if (!params)
1468                         return -ENOMEM;
1469
1470                 /* If we created new params, mark them to be deleted in
1471                  * hci_connect_le_scan_cleanup. It's different case than
1472                  * existing disabled params, those will stay after cleanup.
1473                  */
1474                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1475         }
1476
1477         /* We're trying to connect, so make sure params are at pend_le_conns */
1478         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1479             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1480             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1481                 hci_pend_le_list_del_init(params);
1482                 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1483         }
1484
1485         params->explicit_connect = true;
1486
1487         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1488                params->auto_connect);
1489
1490         return 0;
1491 }
1492
1493 static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1494 {
1495         struct hci_conn *conn;
1496         u8  big;
1497
1498         /* Allocate a BIG if not set */
1499         if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1500                 for (big = 0x00; big < 0xef; big++) {
1501
1502                         conn = hci_conn_hash_lookup_big(hdev, big);
1503                         if (!conn)
1504                                 break;
1505                 }
1506
1507                 if (big == 0xef)
1508                         return -EADDRNOTAVAIL;
1509
1510                 /* Update BIG */
1511                 qos->bcast.big = big;
1512         }
1513
1514         return 0;
1515 }
1516
1517 static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1518 {
1519         struct hci_conn *conn;
1520         u8  bis;
1521
1522         /* Allocate BIS if not set */
1523         if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1524                 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1525                         conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1526
1527                         if (conn) {
1528                                 /* If the BIG handle is already matched to an advertising
1529                                  * handle, do not allocate a new one.
1530                                  */
1531                                 qos->bcast.bis = conn->iso_qos.bcast.bis;
1532                                 return 0;
1533                         }
1534                 }
1535
1536                 /* Find an unused adv set to advertise BIS, skip instance 0x00
1537                  * since it is reserved as general purpose set.
1538                  */
1539                 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1540                      bis++) {
1541
1542                         conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1543                         if (!conn)
1544                                 break;
1545                 }
1546
1547                 if (bis == hdev->le_num_of_adv_sets)
1548                         return -EADDRNOTAVAIL;
1549
1550                 /* Update BIS */
1551                 qos->bcast.bis = bis;
1552         }
1553
1554         return 0;
1555 }
1556
1557 /* This function requires the caller holds hdev->lock */
1558 static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1559                                     struct bt_iso_qos *qos, __u8 base_len,
1560                                     __u8 *base)
1561 {
1562         struct hci_conn *conn;
1563         int err;
1564
1565         /* Let's make sure that le is enabled.*/
1566         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1567                 if (lmp_le_capable(hdev))
1568                         return ERR_PTR(-ECONNREFUSED);
1569                 return ERR_PTR(-EOPNOTSUPP);
1570         }
1571
1572         err = qos_set_big(hdev, qos);
1573         if (err)
1574                 return ERR_PTR(err);
1575
1576         err = qos_set_bis(hdev, qos);
1577         if (err)
1578                 return ERR_PTR(err);
1579
1580         /* Check if the LE Create BIG command has already been sent */
1581         conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1582                                                 qos->bcast.big);
1583         if (conn)
1584                 return ERR_PTR(-EADDRINUSE);
1585
1586         /* Check BIS settings against other bound BISes, since all
1587          * BISes in a BIG must have the same value for all parameters
1588          */
1589         conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1590
1591         if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1592                      base_len != conn->le_per_adv_data_len ||
1593                      memcmp(conn->le_per_adv_data, base, base_len)))
1594                 return ERR_PTR(-EADDRINUSE);
1595
1596         conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1597         if (!conn)
1598                 return ERR_PTR(-ENOMEM);
1599
1600         conn->state = BT_CONNECT;
1601
1602         hci_conn_hold(conn);
1603         return conn;
1604 }
1605
1606 /* This function requires the caller holds hdev->lock */
1607 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1608                                      u8 dst_type, u8 sec_level,
1609                                      u16 conn_timeout,
1610                                      enum conn_reasons conn_reason)
1611 {
1612         struct hci_conn *conn;
1613
1614         /* Let's make sure that le is enabled.*/
1615         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1616                 if (lmp_le_capable(hdev))
1617                         return ERR_PTR(-ECONNREFUSED);
1618
1619                 return ERR_PTR(-EOPNOTSUPP);
1620         }
1621
1622         /* Some devices send ATT messages as soon as the physical link is
1623          * established. To be able to handle these ATT messages, the user-
1624          * space first establishes the connection and then starts the pairing
1625          * process.
1626          *
1627          * So if a hci_conn object already exists for the following connection
1628          * attempt, we simply update pending_sec_level and auth_type fields
1629          * and return the object found.
1630          */
1631         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1632         if (conn) {
1633                 if (conn->pending_sec_level < sec_level)
1634                         conn->pending_sec_level = sec_level;
1635                 goto done;
1636         }
1637
1638         BT_DBG("requesting refresh of dst_addr");
1639
1640         conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1641         if (!conn)
1642                 return ERR_PTR(-ENOMEM);
1643
1644         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1645                 hci_conn_del(conn);
1646                 return ERR_PTR(-EBUSY);
1647         }
1648
1649         conn->state = BT_CONNECT;
1650         set_bit(HCI_CONN_SCANNING, &conn->flags);
1651         conn->dst_type = dst_type;
1652         conn->sec_level = BT_SECURITY_LOW;
1653         conn->pending_sec_level = sec_level;
1654         conn->conn_timeout = conn_timeout;
1655         conn->conn_reason = conn_reason;
1656
1657         hci_update_passive_scan(hdev);
1658
1659 done:
1660         hci_conn_hold(conn);
1661         return conn;
1662 }
1663
1664 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1665                                  u8 sec_level, u8 auth_type,
1666                                  enum conn_reasons conn_reason)
1667 {
1668         struct hci_conn *acl;
1669
1670         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1671                 if (lmp_bredr_capable(hdev))
1672                         return ERR_PTR(-ECONNREFUSED);
1673
1674                 return ERR_PTR(-EOPNOTSUPP);
1675         }
1676
1677         /* Reject outgoing connection to device with same BD ADDR against
1678          * CVE-2020-26555
1679          */
1680         if (!bacmp(&hdev->bdaddr, dst)) {
1681                 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1682                            dst);
1683                 return ERR_PTR(-ECONNREFUSED);
1684         }
1685
1686         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1687         if (!acl) {
1688                 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1689                 if (!acl)
1690                         return ERR_PTR(-ENOMEM);
1691         }
1692
1693         hci_conn_hold(acl);
1694
1695         acl->conn_reason = conn_reason;
1696         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1697                 acl->sec_level = BT_SECURITY_LOW;
1698                 acl->pending_sec_level = sec_level;
1699                 acl->auth_type = auth_type;
1700                 hci_acl_create_connection(acl);
1701         }
1702
1703         return acl;
1704 }
1705
1706 static struct hci_link *hci_conn_link(struct hci_conn *parent,
1707                                       struct hci_conn *conn)
1708 {
1709         struct hci_dev *hdev = parent->hdev;
1710         struct hci_link *link;
1711
1712         bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1713
1714         if (conn->link)
1715                 return conn->link;
1716
1717         if (conn->parent)
1718                 return NULL;
1719
1720         link = kzalloc(sizeof(*link), GFP_KERNEL);
1721         if (!link)
1722                 return NULL;
1723
1724         link->conn = hci_conn_hold(conn);
1725         conn->link = link;
1726         conn->parent = hci_conn_get(parent);
1727
1728         /* Use list_add_tail_rcu append to the list */
1729         list_add_tail_rcu(&link->list, &parent->link_list);
1730
1731         return link;
1732 }
1733
1734 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1735                                  __u16 setting, struct bt_codec *codec)
1736 {
1737         struct hci_conn *acl;
1738         struct hci_conn *sco;
1739         struct hci_link *link;
1740
1741         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1742                               CONN_REASON_SCO_CONNECT);
1743         if (IS_ERR(acl))
1744                 return acl;
1745
1746         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1747         if (!sco) {
1748                 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1749                 if (!sco) {
1750                         hci_conn_drop(acl);
1751                         return ERR_PTR(-ENOMEM);
1752                 }
1753         }
1754
1755         link = hci_conn_link(acl, sco);
1756         if (!link) {
1757                 hci_conn_drop(acl);
1758                 hci_conn_drop(sco);
1759                 return ERR_PTR(-ENOLINK);
1760         }
1761
1762         sco->setting = setting;
1763         sco->codec = *codec;
1764
1765         if (acl->state == BT_CONNECTED &&
1766             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1767                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1768                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1769
1770                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1771                         /* defer SCO setup until mode change completed */
1772                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1773                         return sco;
1774                 }
1775
1776                 hci_sco_setup(acl, 0x00);
1777         }
1778
1779         return sco;
1780 }
1781
1782 static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1783 {
1784         struct hci_dev *hdev = conn->hdev;
1785         struct hci_cp_le_create_big cp;
1786         struct iso_list_data data;
1787
1788         memset(&cp, 0, sizeof(cp));
1789
1790         data.big = qos->bcast.big;
1791         data.bis = qos->bcast.bis;
1792         data.count = 0;
1793
1794         /* Create a BIS for each bound connection */
1795         hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1796                                  BT_BOUND, &data);
1797
1798         cp.handle = qos->bcast.big;
1799         cp.adv_handle = qos->bcast.bis;
1800         cp.num_bis  = data.count;
1801         hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1802         cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1803         cp.bis.latency =  cpu_to_le16(qos->bcast.out.latency);
1804         cp.bis.rtn  = qos->bcast.out.rtn;
1805         cp.bis.phy  = qos->bcast.out.phy;
1806         cp.bis.packing = qos->bcast.packing;
1807         cp.bis.framing = qos->bcast.framing;
1808         cp.bis.encryption = qos->bcast.encryption;
1809         memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1810
1811         return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1812 }
1813
1814 static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1815 {
1816         u8 cig_id = PTR_UINT(data);
1817         struct hci_conn *conn;
1818         struct bt_iso_qos *qos;
1819         struct iso_cig_params pdu;
1820         u8 cis_id;
1821
1822         conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1823         if (!conn)
1824                 return 0;
1825
1826         memset(&pdu, 0, sizeof(pdu));
1827
1828         qos = &conn->iso_qos;
1829         pdu.cp.cig_id = cig_id;
1830         hci_cpu_to_le24(qos->ucast.out.interval, pdu.cp.c_interval);
1831         hci_cpu_to_le24(qos->ucast.in.interval, pdu.cp.p_interval);
1832         pdu.cp.sca = qos->ucast.sca;
1833         pdu.cp.packing = qos->ucast.packing;
1834         pdu.cp.framing = qos->ucast.framing;
1835         pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency);
1836         pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency);
1837
1838         /* Reprogram all CIS(s) with the same CIG, valid range are:
1839          * num_cis: 0x00 to 0x1F
1840          * cis_id: 0x00 to 0xEF
1841          */
1842         for (cis_id = 0x00; cis_id < 0xf0 &&
1843              pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) {
1844                 struct hci_cis_params *cis;
1845
1846                 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1847                 if (!conn)
1848                         continue;
1849
1850                 qos = &conn->iso_qos;
1851
1852                 cis = &pdu.cis[pdu.cp.num_cis++];
1853                 cis->cis_id = cis_id;
1854                 cis->c_sdu  = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1855                 cis->p_sdu  = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1856                 cis->c_phy  = qos->ucast.out.phy ? qos->ucast.out.phy :
1857                               qos->ucast.in.phy;
1858                 cis->p_phy  = qos->ucast.in.phy ? qos->ucast.in.phy :
1859                               qos->ucast.out.phy;
1860                 cis->c_rtn  = qos->ucast.out.rtn;
1861                 cis->p_rtn  = qos->ucast.in.rtn;
1862         }
1863
1864         if (!pdu.cp.num_cis)
1865                 return 0;
1866
1867         return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1868                                      sizeof(pdu.cp) +
1869                                      pdu.cp.num_cis * sizeof(pdu.cis[0]), &pdu,
1870                                      HCI_CMD_TIMEOUT);
1871 }
1872
1873 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1874 {
1875         struct hci_dev *hdev = conn->hdev;
1876         struct iso_list_data data;
1877
1878         memset(&data, 0, sizeof(data));
1879
1880         /* Allocate first still reconfigurable CIG if not set */
1881         if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1882                 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1883                         data.count = 0;
1884
1885                         hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1886                                                  BT_CONNECT, &data);
1887                         if (data.count)
1888                                 continue;
1889
1890                         hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1891                                                  BT_CONNECTED, &data);
1892                         if (!data.count)
1893                                 break;
1894                 }
1895
1896                 if (data.cig == 0xf0)
1897                         return false;
1898
1899                 /* Update CIG */
1900                 qos->ucast.cig = data.cig;
1901         }
1902
1903         if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1904                 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1905                                              qos->ucast.cis))
1906                         return false;
1907                 goto done;
1908         }
1909
1910         /* Allocate first available CIS if not set */
1911         for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1912              data.cis++) {
1913                 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1914                                               data.cis)) {
1915                         /* Update CIS */
1916                         qos->ucast.cis = data.cis;
1917                         break;
1918                 }
1919         }
1920
1921         if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1922                 return false;
1923
1924 done:
1925         if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1926                                UINT_PTR(qos->ucast.cig), NULL) < 0)
1927                 return false;
1928
1929         return true;
1930 }
1931
1932 struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1933                               __u8 dst_type, struct bt_iso_qos *qos)
1934 {
1935         struct hci_conn *cis;
1936
1937         cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1938                                        qos->ucast.cis);
1939         if (!cis) {
1940                 cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1941                 if (!cis)
1942                         return ERR_PTR(-ENOMEM);
1943                 cis->cleanup = cis_cleanup;
1944                 cis->dst_type = dst_type;
1945                 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1946                 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1947         }
1948
1949         if (cis->state == BT_CONNECTED)
1950                 return cis;
1951
1952         /* Check if CIS has been set and the settings matches */
1953         if (cis->state == BT_BOUND &&
1954             !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1955                 return cis;
1956
1957         /* Update LINK PHYs according to QoS preference */
1958         cis->le_tx_phy = qos->ucast.out.phy;
1959         cis->le_rx_phy = qos->ucast.in.phy;
1960
1961         /* If output interval is not set use the input interval as it cannot be
1962          * 0x000000.
1963          */
1964         if (!qos->ucast.out.interval)
1965                 qos->ucast.out.interval = qos->ucast.in.interval;
1966
1967         /* If input interval is not set use the output interval as it cannot be
1968          * 0x000000.
1969          */
1970         if (!qos->ucast.in.interval)
1971                 qos->ucast.in.interval = qos->ucast.out.interval;
1972
1973         /* If output latency is not set use the input latency as it cannot be
1974          * 0x0000.
1975          */
1976         if (!qos->ucast.out.latency)
1977                 qos->ucast.out.latency = qos->ucast.in.latency;
1978
1979         /* If input latency is not set use the output latency as it cannot be
1980          * 0x0000.
1981          */
1982         if (!qos->ucast.in.latency)
1983                 qos->ucast.in.latency = qos->ucast.out.latency;
1984
1985         if (!hci_le_set_cig_params(cis, qos)) {
1986                 hci_conn_drop(cis);
1987                 return ERR_PTR(-EINVAL);
1988         }
1989
1990         hci_conn_hold(cis);
1991
1992         cis->iso_qos = *qos;
1993         cis->state = BT_BOUND;
1994
1995         return cis;
1996 }
1997
1998 bool hci_iso_setup_path(struct hci_conn *conn)
1999 {
2000         struct hci_dev *hdev = conn->hdev;
2001         struct hci_cp_le_setup_iso_path cmd;
2002
2003         memset(&cmd, 0, sizeof(cmd));
2004
2005         if (conn->iso_qos.ucast.out.sdu) {
2006                 cmd.handle = cpu_to_le16(conn->handle);
2007                 cmd.direction = 0x00; /* Input (Host to Controller) */
2008                 cmd.path = 0x00; /* HCI path if enabled */
2009                 cmd.codec = 0x03; /* Transparent Data */
2010
2011                 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2012                                  &cmd) < 0)
2013                         return false;
2014         }
2015
2016         if (conn->iso_qos.ucast.in.sdu) {
2017                 cmd.handle = cpu_to_le16(conn->handle);
2018                 cmd.direction = 0x01; /* Output (Controller to Host) */
2019                 cmd.path = 0x00; /* HCI path if enabled */
2020                 cmd.codec = 0x03; /* Transparent Data */
2021
2022                 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2023                                  &cmd) < 0)
2024                         return false;
2025         }
2026
2027         return true;
2028 }
2029
2030 int hci_conn_check_create_cis(struct hci_conn *conn)
2031 {
2032         if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY))
2033                 return -EINVAL;
2034
2035         if (!conn->parent || conn->parent->state != BT_CONNECTED ||
2036             conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
2037                 return 1;
2038
2039         return 0;
2040 }
2041
2042 static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
2043 {
2044         return hci_le_create_cis_sync(hdev);
2045 }
2046
2047 int hci_le_create_cis_pending(struct hci_dev *hdev)
2048 {
2049         struct hci_conn *conn;
2050         bool pending = false;
2051
2052         rcu_read_lock();
2053
2054         list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2055                 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2056                         rcu_read_unlock();
2057                         return -EBUSY;
2058                 }
2059
2060                 if (!hci_conn_check_create_cis(conn))
2061                         pending = true;
2062         }
2063
2064         rcu_read_unlock();
2065
2066         if (!pending)
2067                 return 0;
2068
2069         /* Queue Create CIS */
2070         return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2071 }
2072
2073 static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2074                               struct bt_iso_io_qos *qos, __u8 phy)
2075 {
2076         /* Only set MTU if PHY is enabled */
2077         if (!qos->sdu && qos->phy) {
2078                 if (hdev->iso_mtu > 0)
2079                         qos->sdu = hdev->iso_mtu;
2080                 else if (hdev->le_mtu > 0)
2081                         qos->sdu = hdev->le_mtu;
2082                 else
2083                         qos->sdu = hdev->acl_mtu;
2084         }
2085
2086         /* Use the same PHY as ACL if set to any */
2087         if (qos->phy == BT_ISO_PHY_ANY)
2088                 qos->phy = phy;
2089
2090         /* Use LE ACL connection interval if not set */
2091         if (!qos->interval)
2092                 /* ACL interval unit in 1.25 ms to us */
2093                 qos->interval = conn->le_conn_interval * 1250;
2094
2095         /* Use LE ACL connection latency if not set */
2096         if (!qos->latency)
2097                 qos->latency = conn->le_conn_latency;
2098 }
2099
2100 static int create_big_sync(struct hci_dev *hdev, void *data)
2101 {
2102         struct hci_conn *conn = data;
2103         struct bt_iso_qos *qos = &conn->iso_qos;
2104         u16 interval, sync_interval = 0;
2105         u32 flags = 0;
2106         int err;
2107
2108         if (qos->bcast.out.phy == 0x02)
2109                 flags |= MGMT_ADV_FLAG_SEC_2M;
2110
2111         /* Align intervals */
2112         interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2113
2114         if (qos->bcast.bis)
2115                 sync_interval = interval * 4;
2116
2117         err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
2118                                      conn->le_per_adv_data, flags, interval,
2119                                      interval, sync_interval);
2120         if (err)
2121                 return err;
2122
2123         return hci_le_create_big(conn, &conn->iso_qos);
2124 }
2125
2126 static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2127 {
2128         struct hci_cp_le_pa_create_sync *cp = data;
2129
2130         bt_dev_dbg(hdev, "");
2131
2132         if (err)
2133                 bt_dev_err(hdev, "Unable to create PA: %d", err);
2134
2135         kfree(cp);
2136 }
2137
2138 static int create_pa_sync(struct hci_dev *hdev, void *data)
2139 {
2140         struct hci_cp_le_pa_create_sync *cp = data;
2141         int err;
2142
2143         err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2144                                     sizeof(*cp), cp, HCI_CMD_TIMEOUT);
2145         if (err) {
2146                 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2147                 return err;
2148         }
2149
2150         return hci_update_passive_scan_sync(hdev);
2151 }
2152
2153 int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type,
2154                        __u8 sid, struct bt_iso_qos *qos)
2155 {
2156         struct hci_cp_le_pa_create_sync *cp;
2157
2158         if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
2159                 return -EBUSY;
2160
2161         cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2162         if (!cp) {
2163                 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2164                 return -ENOMEM;
2165         }
2166
2167         cp->options = qos->bcast.options;
2168         cp->sid = sid;
2169         cp->addr_type = dst_type;
2170         bacpy(&cp->addr, dst);
2171         cp->skip = cpu_to_le16(qos->bcast.skip);
2172         cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
2173         cp->sync_cte_type = qos->bcast.sync_cte_type;
2174
2175         /* Queue start pa_create_sync and scan */
2176         return hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete);
2177 }
2178
2179 int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2180                            struct bt_iso_qos *qos,
2181                            __u16 sync_handle, __u8 num_bis, __u8 bis[])
2182 {
2183         struct _packed {
2184                 struct hci_cp_le_big_create_sync cp;
2185                 __u8  bis[0x11];
2186         } pdu;
2187         int err;
2188
2189         if (num_bis < 0x01 || num_bis > sizeof(pdu.bis))
2190                 return -EINVAL;
2191
2192         err = qos_set_big(hdev, qos);
2193         if (err)
2194                 return err;
2195
2196         if (hcon)
2197                 hcon->iso_qos.bcast.big = qos->bcast.big;
2198
2199         memset(&pdu, 0, sizeof(pdu));
2200         pdu.cp.handle = qos->bcast.big;
2201         pdu.cp.sync_handle = cpu_to_le16(sync_handle);
2202         pdu.cp.encryption = qos->bcast.encryption;
2203         memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode));
2204         pdu.cp.mse = qos->bcast.mse;
2205         pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout);
2206         pdu.cp.num_bis = num_bis;
2207         memcpy(pdu.bis, bis, num_bis);
2208
2209         return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2210                             sizeof(pdu.cp) + num_bis, &pdu);
2211 }
2212
2213 static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2214 {
2215         struct hci_conn *conn = data;
2216
2217         bt_dev_dbg(hdev, "conn %p", conn);
2218
2219         if (err) {
2220                 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2221                 hci_connect_cfm(conn, err);
2222                 hci_conn_del(conn);
2223         }
2224 }
2225
2226 struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
2227                               struct bt_iso_qos *qos,
2228                               __u8 base_len, __u8 *base)
2229 {
2230         struct hci_conn *conn;
2231         __u8 eir[HCI_MAX_PER_AD_LENGTH];
2232
2233         if (base_len && base)
2234                 base_len = eir_append_service_data(eir, 0,  0x1851,
2235                                                    base, base_len);
2236
2237         /* We need hci_conn object using the BDADDR_ANY as dst */
2238         conn = hci_add_bis(hdev, dst, qos, base_len, eir);
2239         if (IS_ERR(conn))
2240                 return conn;
2241
2242         /* Update LINK PHYs according to QoS preference */
2243         conn->le_tx_phy = qos->bcast.out.phy;
2244         conn->le_tx_phy = qos->bcast.out.phy;
2245
2246         /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2247         if (base_len && base) {
2248                 memcpy(conn->le_per_adv_data,  eir, sizeof(eir));
2249                 conn->le_per_adv_data_len = base_len;
2250         }
2251
2252         hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2253                           conn->le_tx_phy ? conn->le_tx_phy :
2254                           hdev->le_tx_def_phys);
2255
2256         conn->iso_qos = *qos;
2257         conn->state = BT_BOUND;
2258
2259         return conn;
2260 }
2261
2262 static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2263 {
2264         struct iso_list_data *d = data;
2265
2266         /* Skip if not broadcast/ANY address */
2267         if (bacmp(&conn->dst, BDADDR_ANY))
2268                 return;
2269
2270         if (d->big != conn->iso_qos.bcast.big ||
2271             d->bis == BT_ISO_QOS_BIS_UNSET ||
2272             d->bis != conn->iso_qos.bcast.bis)
2273                 return;
2274
2275         set_bit(HCI_CONN_PER_ADV, &conn->flags);
2276 }
2277
2278 struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2279                                  __u8 dst_type, struct bt_iso_qos *qos,
2280                                  __u8 base_len, __u8 *base)
2281 {
2282         struct hci_conn *conn;
2283         int err;
2284         struct iso_list_data data;
2285
2286         conn = hci_bind_bis(hdev, dst, qos, base_len, base);
2287         if (IS_ERR(conn))
2288                 return conn;
2289
2290         data.big = qos->bcast.big;
2291         data.bis = qos->bcast.bis;
2292
2293         /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2294          * the start periodic advertising and create BIG commands have
2295          * been queued
2296          */
2297         hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK,
2298                                  BT_BOUND, &data);
2299
2300         /* Queue start periodic advertising and create BIG */
2301         err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2302                                  create_big_complete);
2303         if (err < 0) {
2304                 hci_conn_drop(conn);
2305                 return ERR_PTR(err);
2306         }
2307
2308         return conn;
2309 }
2310
2311 struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2312                                  __u8 dst_type, struct bt_iso_qos *qos)
2313 {
2314         struct hci_conn *le;
2315         struct hci_conn *cis;
2316         struct hci_link *link;
2317
2318         if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2319                 le = hci_connect_le(hdev, dst, dst_type, false,
2320                                     BT_SECURITY_LOW,
2321                                     HCI_LE_CONN_TIMEOUT,
2322                                     HCI_ROLE_SLAVE);
2323         else
2324                 le = hci_connect_le_scan(hdev, dst, dst_type,
2325                                          BT_SECURITY_LOW,
2326                                          HCI_LE_CONN_TIMEOUT,
2327                                          CONN_REASON_ISO_CONNECT);
2328         if (IS_ERR(le))
2329                 return le;
2330
2331         hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2332                           le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2333         hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2334                           le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2335
2336         cis = hci_bind_cis(hdev, dst, dst_type, qos);
2337         if (IS_ERR(cis)) {
2338                 hci_conn_drop(le);
2339                 return cis;
2340         }
2341
2342         link = hci_conn_link(le, cis);
2343         if (!link) {
2344                 hci_conn_drop(le);
2345                 hci_conn_drop(cis);
2346                 return ERR_PTR(-ENOLINK);
2347         }
2348
2349         /* Link takes the refcount */
2350         hci_conn_drop(cis);
2351
2352         cis->state = BT_CONNECT;
2353
2354         hci_le_create_cis_pending(hdev);
2355
2356         return cis;
2357 }
2358
2359 /* Check link security requirement */
2360 int hci_conn_check_link_mode(struct hci_conn *conn)
2361 {
2362         BT_DBG("hcon %p", conn);
2363
2364         /* In Secure Connections Only mode, it is required that Secure
2365          * Connections is used and the link is encrypted with AES-CCM
2366          * using a P-256 authenticated combination key.
2367          */
2368         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2369                 if (!hci_conn_sc_enabled(conn) ||
2370                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2371                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2372                         return 0;
2373         }
2374
2375          /* AES encryption is required for Level 4:
2376           *
2377           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2378           * page 1319:
2379           *
2380           * 128-bit equivalent strength for link and encryption keys
2381           * required using FIPS approved algorithms (E0 not allowed,
2382           * SAFER+ not allowed, and P-192 not allowed; encryption key
2383           * not shortened)
2384           */
2385         if (conn->sec_level == BT_SECURITY_FIPS &&
2386             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2387                 bt_dev_err(conn->hdev,
2388                            "Invalid security: Missing AES-CCM usage");
2389                 return 0;
2390         }
2391
2392         if (hci_conn_ssp_enabled(conn) &&
2393             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2394                 return 0;
2395
2396         return 1;
2397 }
2398
2399 /* Authenticate remote device */
2400 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2401 {
2402         BT_DBG("hcon %p", conn);
2403
2404         if (conn->pending_sec_level > sec_level)
2405                 sec_level = conn->pending_sec_level;
2406
2407         if (sec_level > conn->sec_level)
2408                 conn->pending_sec_level = sec_level;
2409         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2410                 return 1;
2411
2412         /* Make sure we preserve an existing MITM requirement*/
2413         auth_type |= (conn->auth_type & 0x01);
2414
2415         conn->auth_type = auth_type;
2416
2417         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2418                 struct hci_cp_auth_requested cp;
2419
2420                 cp.handle = cpu_to_le16(conn->handle);
2421                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2422                              sizeof(cp), &cp);
2423
2424                 /* If we're already encrypted set the REAUTH_PEND flag,
2425                  * otherwise set the ENCRYPT_PEND.
2426                  */
2427                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2428                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
2429                 else
2430                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2431         }
2432
2433         return 0;
2434 }
2435
2436 /* Encrypt the link */
2437 static void hci_conn_encrypt(struct hci_conn *conn)
2438 {
2439         BT_DBG("hcon %p", conn);
2440
2441         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2442                 struct hci_cp_set_conn_encrypt cp;
2443                 cp.handle  = cpu_to_le16(conn->handle);
2444                 cp.encrypt = 0x01;
2445                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2446                              &cp);
2447         }
2448 }
2449
2450 /* Enable security */
2451 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2452                       bool initiator)
2453 {
2454         BT_DBG("hcon %p", conn);
2455
2456         if (conn->type == LE_LINK)
2457                 return smp_conn_security(conn, sec_level);
2458
2459         /* For sdp we don't need the link key. */
2460         if (sec_level == BT_SECURITY_SDP)
2461                 return 1;
2462
2463         /* For non 2.1 devices and low security level we don't need the link
2464            key. */
2465         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2466                 return 1;
2467
2468         /* For other security levels we need the link key. */
2469         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2470                 goto auth;
2471
2472         switch (conn->key_type) {
2473         case HCI_LK_AUTH_COMBINATION_P256:
2474                 /* An authenticated FIPS approved combination key has
2475                  * sufficient security for security level 4 or lower.
2476                  */
2477                 if (sec_level <= BT_SECURITY_FIPS)
2478                         goto encrypt;
2479                 break;
2480         case HCI_LK_AUTH_COMBINATION_P192:
2481                 /* An authenticated combination key has sufficient security for
2482                  * security level 3 or lower.
2483                  */
2484                 if (sec_level <= BT_SECURITY_HIGH)
2485                         goto encrypt;
2486                 break;
2487         case HCI_LK_UNAUTH_COMBINATION_P192:
2488         case HCI_LK_UNAUTH_COMBINATION_P256:
2489                 /* An unauthenticated combination key has sufficient security
2490                  * for security level 2 or lower.
2491                  */
2492                 if (sec_level <= BT_SECURITY_MEDIUM)
2493                         goto encrypt;
2494                 break;
2495         case HCI_LK_COMBINATION:
2496                 /* A combination key has always sufficient security for the
2497                  * security levels 2 or lower. High security level requires the
2498                  * combination key is generated using maximum PIN code length
2499                  * (16). For pre 2.1 units.
2500                  */
2501                 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2502                         goto encrypt;
2503                 break;
2504         default:
2505                 break;
2506         }
2507
2508 auth:
2509         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2510                 return 0;
2511
2512         if (initiator)
2513                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2514
2515         if (!hci_conn_auth(conn, sec_level, auth_type))
2516                 return 0;
2517
2518 encrypt:
2519         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2520                 /* Ensure that the encryption key size has been read,
2521                  * otherwise stall the upper layer responses.
2522                  */
2523                 if (!conn->enc_key_size)
2524                         return 0;
2525
2526                 /* Nothing else needed, all requirements are met */
2527                 return 1;
2528         }
2529
2530         hci_conn_encrypt(conn);
2531         return 0;
2532 }
2533 EXPORT_SYMBOL(hci_conn_security);
2534
2535 /* Check secure link requirement */
2536 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2537 {
2538         BT_DBG("hcon %p", conn);
2539
2540         /* Accept if non-secure or higher security level is required */
2541         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2542                 return 1;
2543
2544         /* Accept if secure or higher security level is already present */
2545         if (conn->sec_level == BT_SECURITY_HIGH ||
2546             conn->sec_level == BT_SECURITY_FIPS)
2547                 return 1;
2548
2549         /* Reject not secure link */
2550         return 0;
2551 }
2552 EXPORT_SYMBOL(hci_conn_check_secure);
2553
2554 /* Switch role */
2555 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2556 {
2557         BT_DBG("hcon %p", conn);
2558
2559         if (role == conn->role)
2560                 return 1;
2561
2562         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2563                 struct hci_cp_switch_role cp;
2564                 bacpy(&cp.bdaddr, &conn->dst);
2565                 cp.role = role;
2566                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2567         }
2568
2569         return 0;
2570 }
2571 EXPORT_SYMBOL(hci_conn_switch_role);
2572
2573 /* Enter active mode */
2574 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2575 {
2576         struct hci_dev *hdev = conn->hdev;
2577
2578         BT_DBG("hcon %p mode %d", conn, conn->mode);
2579
2580         if (conn->mode != HCI_CM_SNIFF)
2581                 goto timer;
2582
2583         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2584                 goto timer;
2585
2586         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2587                 struct hci_cp_exit_sniff_mode cp;
2588                 cp.handle = cpu_to_le16(conn->handle);
2589                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2590         }
2591
2592 timer:
2593         if (hdev->idle_timeout > 0)
2594                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2595                                    msecs_to_jiffies(hdev->idle_timeout));
2596 }
2597
2598 /* Drop all connection on the device */
2599 void hci_conn_hash_flush(struct hci_dev *hdev)
2600 {
2601         struct list_head *head = &hdev->conn_hash.list;
2602         struct hci_conn *conn;
2603
2604         BT_DBG("hdev %s", hdev->name);
2605
2606         /* We should not traverse the list here, because hci_conn_del
2607          * can remove extra links, which may cause the list traversal
2608          * to hit items that have already been released.
2609          */
2610         while ((conn = list_first_entry_or_null(head,
2611                                                 struct hci_conn,
2612                                                 list)) != NULL) {
2613                 conn->state = BT_CLOSED;
2614                 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2615                 hci_conn_del(conn);
2616         }
2617 }
2618
2619 /* Check pending connect attempts */
2620 void hci_conn_check_pending(struct hci_dev *hdev)
2621 {
2622         struct hci_conn *conn;
2623
2624         BT_DBG("hdev %s", hdev->name);
2625
2626         hci_dev_lock(hdev);
2627
2628         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
2629         if (conn)
2630                 hci_acl_create_connection(conn);
2631
2632         hci_dev_unlock(hdev);
2633 }
2634
2635 static u32 get_link_mode(struct hci_conn *conn)
2636 {
2637         u32 link_mode = 0;
2638
2639         if (conn->role == HCI_ROLE_MASTER)
2640                 link_mode |= HCI_LM_MASTER;
2641
2642         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2643                 link_mode |= HCI_LM_ENCRYPT;
2644
2645         if (test_bit(HCI_CONN_AUTH, &conn->flags))
2646                 link_mode |= HCI_LM_AUTH;
2647
2648         if (test_bit(HCI_CONN_SECURE, &conn->flags))
2649                 link_mode |= HCI_LM_SECURE;
2650
2651         if (test_bit(HCI_CONN_FIPS, &conn->flags))
2652                 link_mode |= HCI_LM_FIPS;
2653
2654         return link_mode;
2655 }
2656
2657 int hci_get_conn_list(void __user *arg)
2658 {
2659         struct hci_conn *c;
2660         struct hci_conn_list_req req, *cl;
2661         struct hci_conn_info *ci;
2662         struct hci_dev *hdev;
2663         int n = 0, size, err;
2664
2665         if (copy_from_user(&req, arg, sizeof(req)))
2666                 return -EFAULT;
2667
2668         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2669                 return -EINVAL;
2670
2671         size = sizeof(req) + req.conn_num * sizeof(*ci);
2672
2673         cl = kmalloc(size, GFP_KERNEL);
2674         if (!cl)
2675                 return -ENOMEM;
2676
2677         hdev = hci_dev_get(req.dev_id);
2678         if (!hdev) {
2679                 kfree(cl);
2680                 return -ENODEV;
2681         }
2682
2683         ci = cl->conn_info;
2684
2685         hci_dev_lock(hdev);
2686         list_for_each_entry(c, &hdev->conn_hash.list, list) {
2687                 bacpy(&(ci + n)->bdaddr, &c->dst);
2688                 (ci + n)->handle = c->handle;
2689                 (ci + n)->type  = c->type;
2690                 (ci + n)->out   = c->out;
2691                 (ci + n)->state = c->state;
2692                 (ci + n)->link_mode = get_link_mode(c);
2693                 if (++n >= req.conn_num)
2694                         break;
2695         }
2696         hci_dev_unlock(hdev);
2697
2698         cl->dev_id = hdev->id;
2699         cl->conn_num = n;
2700         size = sizeof(req) + n * sizeof(*ci);
2701
2702         hci_dev_put(hdev);
2703
2704         err = copy_to_user(arg, cl, size);
2705         kfree(cl);
2706
2707         return err ? -EFAULT : 0;
2708 }
2709
2710 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2711 {
2712         struct hci_conn_info_req req;
2713         struct hci_conn_info ci;
2714         struct hci_conn *conn;
2715         char __user *ptr = arg + sizeof(req);
2716
2717         if (copy_from_user(&req, arg, sizeof(req)))
2718                 return -EFAULT;
2719
2720         hci_dev_lock(hdev);
2721         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2722         if (conn) {
2723                 bacpy(&ci.bdaddr, &conn->dst);
2724                 ci.handle = conn->handle;
2725                 ci.type  = conn->type;
2726                 ci.out   = conn->out;
2727                 ci.state = conn->state;
2728                 ci.link_mode = get_link_mode(conn);
2729         }
2730         hci_dev_unlock(hdev);
2731
2732         if (!conn)
2733                 return -ENOENT;
2734
2735         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2736 }
2737
2738 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2739 {
2740         struct hci_auth_info_req req;
2741         struct hci_conn *conn;
2742
2743         if (copy_from_user(&req, arg, sizeof(req)))
2744                 return -EFAULT;
2745
2746         hci_dev_lock(hdev);
2747         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2748         if (conn)
2749                 req.type = conn->auth_type;
2750         hci_dev_unlock(hdev);
2751
2752         if (!conn)
2753                 return -ENOENT;
2754
2755         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2756 }
2757
2758 struct hci_chan *hci_chan_create(struct hci_conn *conn)
2759 {
2760         struct hci_dev *hdev = conn->hdev;
2761         struct hci_chan *chan;
2762
2763         BT_DBG("%s hcon %p", hdev->name, conn);
2764
2765         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2766                 BT_DBG("Refusing to create new hci_chan");
2767                 return NULL;
2768         }
2769
2770         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2771         if (!chan)
2772                 return NULL;
2773
2774         chan->conn = hci_conn_get(conn);
2775         skb_queue_head_init(&chan->data_q);
2776         chan->state = BT_CONNECTED;
2777
2778         list_add_rcu(&chan->list, &conn->chan_list);
2779
2780         return chan;
2781 }
2782
2783 void hci_chan_del(struct hci_chan *chan)
2784 {
2785         struct hci_conn *conn = chan->conn;
2786         struct hci_dev *hdev = conn->hdev;
2787
2788         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2789
2790         list_del_rcu(&chan->list);
2791
2792         synchronize_rcu();
2793
2794         /* Prevent new hci_chan's to be created for this hci_conn */
2795         set_bit(HCI_CONN_DROP, &conn->flags);
2796
2797         hci_conn_put(conn);
2798
2799         skb_queue_purge(&chan->data_q);
2800         kfree(chan);
2801 }
2802
2803 void hci_chan_list_flush(struct hci_conn *conn)
2804 {
2805         struct hci_chan *chan, *n;
2806
2807         BT_DBG("hcon %p", conn);
2808
2809         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2810                 hci_chan_del(chan);
2811 }
2812
2813 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2814                                                  __u16 handle)
2815 {
2816         struct hci_chan *hchan;
2817
2818         list_for_each_entry(hchan, &hcon->chan_list, list) {
2819                 if (hchan->handle == handle)
2820                         return hchan;
2821         }
2822
2823         return NULL;
2824 }
2825
2826 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2827 {
2828         struct hci_conn_hash *h = &hdev->conn_hash;
2829         struct hci_conn *hcon;
2830         struct hci_chan *hchan = NULL;
2831
2832         rcu_read_lock();
2833
2834         list_for_each_entry_rcu(hcon, &h->list, list) {
2835                 hchan = __hci_chan_lookup_handle(hcon, handle);
2836                 if (hchan)
2837                         break;
2838         }
2839
2840         rcu_read_unlock();
2841
2842         return hchan;
2843 }
2844
2845 u32 hci_conn_get_phy(struct hci_conn *conn)
2846 {
2847         u32 phys = 0;
2848
2849         /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2850          * Table 6.2: Packets defined for synchronous, asynchronous, and
2851          * CPB logical transport types.
2852          */
2853         switch (conn->type) {
2854         case SCO_LINK:
2855                 /* SCO logical transport (1 Mb/s):
2856                  * HV1, HV2, HV3 and DV.
2857                  */
2858                 phys |= BT_PHY_BR_1M_1SLOT;
2859
2860                 break;
2861
2862         case ACL_LINK:
2863                 /* ACL logical transport (1 Mb/s) ptt=0:
2864                  * DH1, DM3, DH3, DM5 and DH5.
2865                  */
2866                 phys |= BT_PHY_BR_1M_1SLOT;
2867
2868                 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2869                         phys |= BT_PHY_BR_1M_3SLOT;
2870
2871                 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2872                         phys |= BT_PHY_BR_1M_5SLOT;
2873
2874                 /* ACL logical transport (2 Mb/s) ptt=1:
2875                  * 2-DH1, 2-DH3 and 2-DH5.
2876                  */
2877                 if (!(conn->pkt_type & HCI_2DH1))
2878                         phys |= BT_PHY_EDR_2M_1SLOT;
2879
2880                 if (!(conn->pkt_type & HCI_2DH3))
2881                         phys |= BT_PHY_EDR_2M_3SLOT;
2882
2883                 if (!(conn->pkt_type & HCI_2DH5))
2884                         phys |= BT_PHY_EDR_2M_5SLOT;
2885
2886                 /* ACL logical transport (3 Mb/s) ptt=1:
2887                  * 3-DH1, 3-DH3 and 3-DH5.
2888                  */
2889                 if (!(conn->pkt_type & HCI_3DH1))
2890                         phys |= BT_PHY_EDR_3M_1SLOT;
2891
2892                 if (!(conn->pkt_type & HCI_3DH3))
2893                         phys |= BT_PHY_EDR_3M_3SLOT;
2894
2895                 if (!(conn->pkt_type & HCI_3DH5))
2896                         phys |= BT_PHY_EDR_3M_5SLOT;
2897
2898                 break;
2899
2900         case ESCO_LINK:
2901                 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2902                 phys |= BT_PHY_BR_1M_1SLOT;
2903
2904                 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2905                         phys |= BT_PHY_BR_1M_3SLOT;
2906
2907                 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2908                 if (!(conn->pkt_type & ESCO_2EV3))
2909                         phys |= BT_PHY_EDR_2M_1SLOT;
2910
2911                 if (!(conn->pkt_type & ESCO_2EV5))
2912                         phys |= BT_PHY_EDR_2M_3SLOT;
2913
2914                 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2915                 if (!(conn->pkt_type & ESCO_3EV3))
2916                         phys |= BT_PHY_EDR_3M_1SLOT;
2917
2918                 if (!(conn->pkt_type & ESCO_3EV5))
2919                         phys |= BT_PHY_EDR_3M_3SLOT;
2920
2921                 break;
2922
2923         case LE_LINK:
2924                 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2925                         phys |= BT_PHY_LE_1M_TX;
2926
2927                 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2928                         phys |= BT_PHY_LE_1M_RX;
2929
2930                 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2931                         phys |= BT_PHY_LE_2M_TX;
2932
2933                 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2934                         phys |= BT_PHY_LE_2M_RX;
2935
2936                 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2937                         phys |= BT_PHY_LE_CODED_TX;
2938
2939                 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2940                         phys |= BT_PHY_LE_CODED_RX;
2941
2942                 break;
2943         }
2944
2945         return phys;
2946 }
2947
2948 static int abort_conn_sync(struct hci_dev *hdev, void *data)
2949 {
2950         struct hci_conn *conn;
2951         u16 handle = PTR_UINT(data);
2952
2953         conn = hci_conn_hash_lookup_handle(hdev, handle);
2954         if (!conn)
2955                 return 0;
2956
2957         return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
2958 }
2959
2960 int hci_abort_conn(struct hci_conn *conn, u8 reason)
2961 {
2962         struct hci_dev *hdev = conn->hdev;
2963
2964         /* If abort_reason has already been set it means the connection is
2965          * already being aborted so don't attempt to overwrite it.
2966          */
2967         if (conn->abort_reason)
2968                 return 0;
2969
2970         bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
2971
2972         conn->abort_reason = reason;
2973
2974         /* If the connection is pending check the command opcode since that
2975          * might be blocking on hci_cmd_sync_work while waiting its respective
2976          * event so we need to hci_cmd_sync_cancel to cancel it.
2977          *
2978          * hci_connect_le serializes the connection attempts so only one
2979          * connection can be in BT_CONNECT at time.
2980          */
2981         if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
2982                 switch (hci_skb_event(hdev->sent_cmd)) {
2983                 case HCI_EV_LE_CONN_COMPLETE:
2984                 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
2985                 case HCI_EVT_LE_CIS_ESTABLISHED:
2986                         hci_cmd_sync_cancel(hdev, -ECANCELED);
2987                         break;
2988                 }
2989         }
2990
2991         return hci_cmd_sync_queue(hdev, abort_conn_sync, UINT_PTR(conn->handle),
2992                                   NULL);
2993 }