net/bluetooth/a2mp.c

   1 /*
   2    Copyright (c) 2010,2011 Code Aurora Forum.  All rights reserved.
   3    Copyright (c) 2011,2012 Intel Corp.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License version 2 and
   7    only version 2 as published by the Free Software Foundation.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13 */
  14
  15 #include <net/bluetooth/bluetooth.h>
  16 #include <net/bluetooth/hci_core.h>
  17 #include <net/bluetooth/l2cap.h>
  18 #include <net/bluetooth/a2mp.h>
  19 #include <net/bluetooth/amp.h>
  20
  21 /* Global AMP Manager list */
  22 LIST_HEAD(amp_mgr_list);
  23 DEFINE_MUTEX(amp_mgr_list_lock);
  24
  25 /* A2MP build & send command helper functions */
  26 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
  27 {
  28         struct a2mp_cmd *cmd;
  29         int plen;
  30
  31         plen = sizeof(*cmd) + len;
  32         cmd = kzalloc(plen, GFP_KERNEL);
  33         if (!cmd)
  34                 return NULL;
  35
  36         cmd->code = code;
  37         cmd->ident = ident;
  38         cmd->len = cpu_to_le16(len);
  39
  40         memcpy(cmd->data, data, len);
  41
  42         return cmd;
  43 }
  44
  45 void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
  46 {
  47         struct l2cap_chan *chan = mgr->a2mp_chan;
  48         struct a2mp_cmd *cmd;
  49         u16 total_len = len + sizeof(*cmd);
  50         struct kvec iv;
  51         struct msghdr msg;
  52
  53         cmd = __a2mp_build(code, ident, len, data);
  54         if (!cmd)
  55                 return;
  56
  57         iv.iov_base = cmd;
  58         iv.iov_len = total_len;
  59
  60         memset(&msg, 0, sizeof(msg));
  61
  62         msg.msg_iov = (struct iovec *) &iv;
  63         msg.msg_iovlen = 1;
  64
  65         l2cap_chan_send(chan, &msg, total_len, 0);
  66
  67         kfree(cmd);
  68 }
  69
  70 static u8 __next_ident(struct amp_mgr *mgr)
  71 {
  72         if (++mgr->ident == 0)
  73                 mgr->ident = 1;
  74
  75         return mgr->ident;
  76 }
  77
  78 static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
  79 {
  80         cl->id = 0;
  81         cl->type = 0;
  82         cl->status = 1;
  83 }
  84
  85 /* hci_dev_list shall be locked */
  86 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
  87 {
  88         int i = 0;
  89         struct hci_dev *hdev;
  90
  91         __a2mp_cl_bredr(cl);
  92
  93         list_for_each_entry(hdev, &hci_dev_list, list) {
  94                 /* Iterate through AMP controllers */
  95                 if (hdev->id == HCI_BREDR_ID)
  96                         continue;
  97
  98                 /* Starting from second entry */
  99                 if (++i >= num_ctrl)
 100                         return;
 101
 102                 cl[i].id = hdev->id;
 103                 cl[i].type = hdev->amp_type;
 104                 cl[i].status = hdev->amp_status;
 105         }
 106 }
 107
 108 /* Processing A2MP messages */
 109 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
 110                             struct a2mp_cmd *hdr)
 111 {
 112         struct a2mp_cmd_rej *rej = (void *) skb->data;
 113
 114         if (le16_to_cpu(hdr->len) < sizeof(*rej))
 115                 return -EINVAL;
 116
 117         BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
 118
 119         skb_pull(skb, sizeof(*rej));
 120
 121         return 0;
 122 }
 123
 124 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
 125                              struct a2mp_cmd *hdr)
 126 {
 127         struct a2mp_discov_req *req = (void *) skb->data;
 128         u16 len = le16_to_cpu(hdr->len);
 129         struct a2mp_discov_rsp *rsp;
 130         u16 ext_feat;
 131         u8 num_ctrl;
 132
 133         if (len < sizeof(*req))
 134                 return -EINVAL;
 135
 136         skb_pull(skb, sizeof(*req));
 137
 138         ext_feat = le16_to_cpu(req->ext_feat);
 139
 140         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
 141
 142         /* check that packet is not broken for now */
 143         while (ext_feat & A2MP_FEAT_EXT) {
 144                 if (len < sizeof(ext_feat))
 145                         return -EINVAL;
 146
 147                 ext_feat = get_unaligned_le16(skb->data);
 148                 BT_DBG("efm 0x%4.4x", ext_feat);
 149                 len -= sizeof(ext_feat);
 150                 skb_pull(skb, sizeof(ext_feat));
 151         }
 152
 153         read_lock(&hci_dev_list_lock);
 154
 155         num_ctrl = __hci_num_ctrl();
 156         len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
 157         rsp = kmalloc(len, GFP_ATOMIC);
 158         if (!rsp) {
 159                 read_unlock(&hci_dev_list_lock);
 160                 return -ENOMEM;
 161         }
 162
 163         rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
 164         rsp->ext_feat = 0;
 165
 166         __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
 167
 168         read_unlock(&hci_dev_list_lock);
 169
 170         a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
 171
 172         kfree(rsp);
 173         return 0;
 174 }
 175
 176 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 177                              struct a2mp_cmd *hdr)
 178 {
 179         struct a2mp_discov_rsp *rsp = (void *) skb->data;
 180         u16 len = le16_to_cpu(hdr->len);
 181         struct a2mp_cl *cl;
 182         u16 ext_feat;
 183
 184         if (len < sizeof(*rsp))
 185                 return -EINVAL;
 186
 187         len -= sizeof(*rsp);
 188         skb_pull(skb, sizeof(*rsp));
 189
 190         ext_feat = le16_to_cpu(rsp->ext_feat);
 191
 192         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
 193
 194         /* check that packet is not broken for now */
 195         while (ext_feat & A2MP_FEAT_EXT) {
 196                 if (len < sizeof(ext_feat))
 197                         return -EINVAL;
 198
 199                 ext_feat = get_unaligned_le16(skb->data);
 200                 BT_DBG("efm 0x%4.4x", ext_feat);
 201                 len -= sizeof(ext_feat);
 202                 skb_pull(skb, sizeof(ext_feat));
 203         }
 204
 205         cl = (void *) skb->data;
 206         while (len >= sizeof(*cl)) {
 207                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
 208                        cl->status);
 209
 210                 if (cl->id != HCI_BREDR_ID && cl->type == HCI_AMP) {
 211                         struct a2mp_info_req req;
 212
 213                         req.id = cl->id;
 214                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 215                                   sizeof(req), &req);
 216                 }
 217
 218                 len -= sizeof(*cl);
 219                 cl = (void *) skb_pull(skb, sizeof(*cl));
 220         }
 221
 222         return 0;
 223 }
 224
 225 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 226                               struct a2mp_cmd *hdr)
 227 {
 228         struct a2mp_cl *cl = (void *) skb->data;
 229
 230         while (skb->len >= sizeof(*cl)) {
 231                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 232                        cl->status);
 233                 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
 234         }
 235
 236         /* TODO send A2MP_CHANGE_RSP */
 237
 238         return 0;
 239 }
 240
 241 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 242                             struct a2mp_cmd *hdr)
 243 {
 244         struct a2mp_info_req *req  = (void *) skb->data;
 245         struct hci_dev *hdev;
 246
 247         if (le16_to_cpu(hdr->len) < sizeof(*req))
 248                 return -EINVAL;
 249
 250         BT_DBG("id %d", req->id);
 251
 252         hdev = hci_dev_get(req->id);
 253         if (!hdev) {
 254                 struct a2mp_info_rsp rsp;
 255
 256                 rsp.id = req->id;
 257                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 258
 259                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 260                           &rsp);
 261         }
 262
 263         if (hdev->dev_type != HCI_BREDR) {
 264                 mgr->state = READ_LOC_AMP_INFO;
 265                 hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 266         }
 267
 268         hci_dev_put(hdev);
 269
 270         skb_pull(skb, sizeof(*req));
 271         return 0;
 272 }
 273
 274 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
 275                                 struct a2mp_cmd *hdr)
 276 {
 277         struct a2mp_amp_assoc_req *req = (void *) skb->data;
 278         struct hci_dev *hdev;
 279         struct amp_mgr *tmp;
 280
 281         if (le16_to_cpu(hdr->len) < sizeof(*req))
 282                 return -EINVAL;
 283
 284         BT_DBG("id %d", req->id);
 285
 286         /* Make sure that other request is not processed */
 287         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 288
 289         hdev = hci_dev_get(req->id);
 290         if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
 291                 struct a2mp_amp_assoc_rsp rsp;
 292                 rsp.id = req->id;
 293
 294                 if (tmp) {
 295                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 296                         amp_mgr_put(tmp);
 297                 } else {
 298                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 299                 }
 300
 301                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 302                           &rsp);
 303
 304                 goto done;
 305         }
 306
 307         amp_read_loc_assoc(hdev, mgr);
 308
 309 done:
 310         if (hdev)
 311                 hci_dev_put(hdev);
 312
 313         skb_pull(skb, sizeof(*req));
 314         return 0;
 315 }
 316
 317 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 318                                    struct a2mp_cmd *hdr)
 319 {
 320         struct a2mp_physlink_req *req = (void *) skb->data;
 321
 322         struct a2mp_physlink_rsp rsp;
 323         struct hci_dev *hdev;
 324         struct hci_conn *hcon;
 325
 326         if (le16_to_cpu(hdr->len) < sizeof(*req))
 327                 return -EINVAL;
 328
 329         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 330
 331         rsp.local_id = req->remote_id;
 332         rsp.remote_id = req->local_id;
 333
 334         hdev = hci_dev_get(req->remote_id);
 335         if (!hdev || hdev->amp_type != HCI_AMP) {
 336                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 337                 goto send_rsp;
 338         }
 339
 340         /* TODO process physlink create */
 341
 342         hcon = phylink_add(hdev, mgr, req->local_id);
 343         if (hcon) {
 344                 BT_DBG("hcon %p", hcon);
 345
 346                 rsp.status = A2MP_STATUS_SUCCESS;
 347         } else {
 348                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 349         }
 350
 351 send_rsp:
 352         if (hdev)
 353                 hci_dev_put(hdev);
 354
 355         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp),
 356                   &rsp);
 357
 358         skb_pull(skb, le16_to_cpu(hdr->len));
 359         return 0;
 360 }
 361
 362 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 363                                  struct a2mp_cmd *hdr)
 364 {
 365         struct a2mp_physlink_req *req = (void *) skb->data;
 366         struct a2mp_physlink_rsp rsp;
 367         struct hci_dev *hdev;
 368         struct hci_conn *hcon;
 369
 370         if (le16_to_cpu(hdr->len) < sizeof(*req))
 371                 return -EINVAL;
 372
 373         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 374
 375         rsp.local_id = req->remote_id;
 376         rsp.remote_id = req->local_id;
 377         rsp.status = A2MP_STATUS_SUCCESS;
 378
 379         hdev = hci_dev_get(req->remote_id);
 380         if (!hdev) {
 381                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 382                 goto send_rsp;
 383         }
 384
 385         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
 386         if (!hcon) {
 387                 BT_ERR("No phys link exist");
 388                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 389                 goto clean;
 390         }
 391
 392         /* TODO Disconnect Phys Link here */
 393
 394 clean:
 395         hci_dev_put(hdev);
 396
 397 send_rsp:
 398         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 399
 400         skb_pull(skb, sizeof(*req));
 401         return 0;
 402 }
 403
 404 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 405                                struct a2mp_cmd *hdr)
 406 {
 407         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 408
 409         skb_pull(skb, le16_to_cpu(hdr->len));
 410         return 0;
 411 }
 412
 413 /* Handle A2MP signalling */
 414 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 415 {
 416         struct a2mp_cmd *hdr;
 417         struct amp_mgr *mgr = chan->data;
 418         int err = 0;
 419
 420         amp_mgr_get(mgr);
 421
 422         while (skb->len >= sizeof(*hdr)) {
 423                 u16 len;
 424
 425                 hdr = (void *) skb->data;
 426                 len = le16_to_cpu(hdr->len);
 427
 428                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 429
 430                 skb_pull(skb, sizeof(*hdr));
 431
 432                 if (len > skb->len || !hdr->ident) {
 433                         err = -EINVAL;
 434                         break;
 435                 }
 436
 437                 mgr->ident = hdr->ident;
 438
 439                 switch (hdr->code) {
 440                 case A2MP_COMMAND_REJ:
 441                         a2mp_command_rej(mgr, skb, hdr);
 442                         break;
 443
 444                 case A2MP_DISCOVER_REQ:
 445                         err = a2mp_discover_req(mgr, skb, hdr);
 446                         break;
 447
 448                 case A2MP_CHANGE_NOTIFY:
 449                         err = a2mp_change_notify(mgr, skb, hdr);
 450                         break;
 451
 452                 case A2MP_GETINFO_REQ:
 453                         err = a2mp_getinfo_req(mgr, skb, hdr);
 454                         break;
 455
 456                 case A2MP_GETAMPASSOC_REQ:
 457                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 458                         break;
 459
 460                 case A2MP_CREATEPHYSLINK_REQ:
 461                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 462                         break;
 463
 464                 case A2MP_DISCONNPHYSLINK_REQ:
 465                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 466                         break;
 467
 468                 case A2MP_DISCOVER_RSP:
 469                         err = a2mp_discover_rsp(mgr, skb, hdr);
 470                         break;
 471
 472                 case A2MP_CHANGE_RSP:
 473                 case A2MP_GETINFO_RSP:
 474                 case A2MP_GETAMPASSOC_RSP:
 475                 case A2MP_CREATEPHYSLINK_RSP:
 476                 case A2MP_DISCONNPHYSLINK_RSP:
 477                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 478                         break;
 479
 480                 default:
 481                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 482                         err = -EINVAL;
 483                         break;
 484                 }
 485         }
 486
 487         if (err) {
 488                 struct a2mp_cmd_rej rej;
 489
 490                 rej.reason = __constant_cpu_to_le16(0);
 491                 hdr = (void *) skb->data;
 492
 493                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 494
 495                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 496                           &rej);
 497         }
 498
 499         /* Always free skb and return success error code to prevent
 500            from sending L2CAP Disconnect over A2MP channel */
 501         kfree_skb(skb);
 502
 503         amp_mgr_put(mgr);
 504
 505         return 0;
 506 }
 507
 508 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 509 {
 510         l2cap_chan_put(chan);
 511 }
 512
 513 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
 514 {
 515         struct amp_mgr *mgr = chan->data;
 516
 517         if (!mgr)
 518                 return;
 519
 520         BT_DBG("chan %p state %s", chan, state_to_string(state));
 521
 522         chan->state = state;
 523
 524         switch (state) {
 525         case BT_CLOSED:
 526                 if (mgr)
 527                         amp_mgr_put(mgr);
 528                 break;
 529         }
 530 }
 531
 532 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 533                                               unsigned long len, int nb)
 534 {
 535         return bt_skb_alloc(len, GFP_KERNEL);
 536 }
 537
 538 static struct l2cap_ops a2mp_chan_ops = {
 539         .name = "L2CAP A2MP channel",
 540         .recv = a2mp_chan_recv_cb,
 541         .close = a2mp_chan_close_cb,
 542         .state_change = a2mp_chan_state_change_cb,
 543         .alloc_skb = a2mp_chan_alloc_skb_cb,
 544
 545         /* Not implemented for A2MP */
 546         .new_connection = l2cap_chan_no_new_connection,
 547         .teardown = l2cap_chan_no_teardown,
 548         .ready = l2cap_chan_no_ready,
 549 };
 550
 551 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn)
 552 {
 553         struct l2cap_chan *chan;
 554         int err;
 555
 556         chan = l2cap_chan_create();
 557         if (!chan)
 558                 return NULL;
 559
 560         BT_DBG("chan %p", chan);
 561
 562         chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
 563         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 564
 565         chan->ops = &a2mp_chan_ops;
 566
 567         l2cap_chan_set_defaults(chan);
 568         chan->remote_max_tx = chan->max_tx;
 569         chan->remote_tx_win = chan->tx_win;
 570
 571         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 572         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 573
 574         skb_queue_head_init(&chan->tx_q);
 575
 576         chan->mode = L2CAP_MODE_ERTM;
 577
 578         err = l2cap_ertm_init(chan);
 579         if (err < 0) {
 580                 l2cap_chan_del(chan, 0);
 581                 return NULL;
 582         }
 583
 584         chan->conf_state = 0;
 585
 586         l2cap_chan_add(conn, chan);
 587
 588         chan->remote_mps = chan->omtu;
 589         chan->mps = chan->omtu;
 590
 591         chan->state = BT_CONNECTED;
 592
 593         return chan;
 594 }
 595
 596 /* AMP Manager functions */
 597 void amp_mgr_get(struct amp_mgr *mgr)
 598 {
 599         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 600
 601         kref_get(&mgr->kref);
 602 }
 603
 604 static void amp_mgr_destroy(struct kref *kref)
 605 {
 606         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 607
 608         BT_DBG("mgr %p", mgr);
 609
 610         mutex_lock(&amp_mgr_list_lock);
 611         list_del(&mgr->list);
 612         mutex_unlock(&amp_mgr_list_lock);
 613
 614         amp_ctrl_list_flush(mgr);
 615         kfree(mgr);
 616 }
 617
 618 int amp_mgr_put(struct amp_mgr *mgr)
 619 {
 620         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 621
 622         return kref_put(&mgr->kref, &amp_mgr_destroy);
 623 }
 624
 625 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
 626 {
 627         struct amp_mgr *mgr;
 628         struct l2cap_chan *chan;
 629
 630         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 631         if (!mgr)
 632                 return NULL;
 633
 634         BT_DBG("conn %p mgr %p", conn, mgr);
 635
 636         mgr->l2cap_conn = conn;
 637
 638         chan = a2mp_chan_open(conn);
 639         if (!chan) {
 640                 kfree(mgr);
 641                 return NULL;
 642         }
 643
 644         mgr->a2mp_chan = chan;
 645         chan->data = mgr;
 646
 647         conn->hcon->amp_mgr = mgr;
 648
 649         kref_init(&mgr->kref);
 650
 651         /* Remote AMP ctrl list initialization */
 652         INIT_LIST_HEAD(&mgr->amp_ctrls);
 653         mutex_init(&mgr->amp_ctrls_lock);
 654
 655         mutex_lock(&amp_mgr_list_lock);
 656         list_add(&mgr->list, &amp_mgr_list);
 657         mutex_unlock(&amp_mgr_list_lock);
 658
 659         return mgr;
 660 }
 661
 662 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 663                                        struct sk_buff *skb)
 664 {
 665         struct amp_mgr *mgr;
 666
 667         mgr = amp_mgr_create(conn);
 668         if (!mgr) {
 669                 BT_ERR("Could not create AMP manager");
 670                 return NULL;
 671         }
 672
 673         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 674
 675         return mgr->a2mp_chan;
 676 }
 677
 678 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
 679 {
 680         struct amp_mgr *mgr;
 681
 682         mutex_lock(&amp_mgr_list_lock);
 683         list_for_each_entry(mgr, &amp_mgr_list, list) {
 684                 if (mgr->state == state) {
 685                         amp_mgr_get(mgr);
 686                         mutex_unlock(&amp_mgr_list_lock);
 687                         return mgr;
 688                 }
 689         }
 690         mutex_unlock(&amp_mgr_list_lock);
 691
 692         return NULL;
 693 }
 694
 695 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 696 {
 697         struct amp_mgr *mgr;
 698         struct a2mp_info_rsp rsp;
 699
 700         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 701         if (!mgr)
 702                 return;
 703
 704         BT_DBG("%s mgr %p", hdev->name, mgr);
 705
 706         rsp.id = hdev->id;
 707         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 708
 709         if (hdev->amp_type != HCI_BREDR) {
 710                 rsp.status = 0;
 711                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 712                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 713                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 714                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 715                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 716         }
 717
 718         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 719         amp_mgr_put(mgr);
 720 }
 721
 722 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 723 {
 724         struct amp_mgr *mgr;
 725         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 726         struct a2mp_amp_assoc_rsp *rsp;
 727         size_t len;
 728
 729         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 730         if (!mgr)
 731                 return;
 732
 733         BT_DBG("%s mgr %p", hdev->name, mgr);
 734
 735         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 736         rsp = kzalloc(len, GFP_KERNEL);
 737         if (!rsp) {
 738                 amp_mgr_put(mgr);
 739                 return;
 740         }
 741
 742         rsp->id = hdev->id;
 743
 744         if (status) {
 745                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 746         } else {
 747                 rsp->status = A2MP_STATUS_SUCCESS;
 748                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 749         }
 750
 751         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 752         amp_mgr_put(mgr);
 753         kfree(rsp);
 754 }