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 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         bool found = false;
 184
 185         if (len < sizeof(*rsp))
 186                 return -EINVAL;
 187
 188         len -= sizeof(*rsp);
 189         skb_pull(skb, sizeof(*rsp));
 190
 191         ext_feat = le16_to_cpu(rsp->ext_feat);
 192
 193         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
 194
 195         /* check that packet is not broken for now */
 196         while (ext_feat & A2MP_FEAT_EXT) {
 197                 if (len < sizeof(ext_feat))
 198                         return -EINVAL;
 199
 200                 ext_feat = get_unaligned_le16(skb->data);
 201                 BT_DBG("efm 0x%4.4x", ext_feat);
 202                 len -= sizeof(ext_feat);
 203                 skb_pull(skb, sizeof(ext_feat));
 204         }
 205
 206         cl = (void *) skb->data;
 207         while (len >= sizeof(*cl)) {
 208                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
 209                        cl->status);
 210
 211                 if (cl->id != HCI_BREDR_ID && cl->type == HCI_AMP) {
 212                         struct a2mp_info_req req;
 213
 214                         found = true;
 215                         req.id = cl->id;
 216                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 217                                   sizeof(req), &req);
 218                 }
 219
 220                 len -= sizeof(*cl);
 221                 cl = (void *) skb_pull(skb, sizeof(*cl));
 222         }
 223
 224         /* Fall back to L2CAP init sequence */
 225         if (!found) {
 226                 struct l2cap_conn *conn = mgr->l2cap_conn;
 227                 struct l2cap_chan *chan;
 228
 229                 mutex_lock(&conn->chan_lock);
 230
 231                 list_for_each_entry(chan, &conn->chan_l, list) {
 232
 233                         BT_DBG("chan %p state %s", chan,
 234                                state_to_string(chan->state));
 235
 236                         if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP)
 237                                 continue;
 238
 239                         l2cap_chan_lock(chan);
 240
 241                         if (chan->state == BT_CONNECT)
 242                                 l2cap_send_conn_req(chan);
 243
 244                         l2cap_chan_unlock(chan);
 245                 }
 246
 247                 mutex_unlock(&conn->chan_lock);
 248         }
 249
 250         return 0;
 251 }
 252
 253 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 254                               struct a2mp_cmd *hdr)
 255 {
 256         struct a2mp_cl *cl = (void *) skb->data;
 257
 258         while (skb->len >= sizeof(*cl)) {
 259                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 260                        cl->status);
 261                 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
 262         }
 263
 264         /* TODO send A2MP_CHANGE_RSP */
 265
 266         return 0;
 267 }
 268
 269 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 270                             struct a2mp_cmd *hdr)
 271 {
 272         struct a2mp_info_req *req  = (void *) skb->data;
 273         struct hci_dev *hdev;
 274
 275         if (le16_to_cpu(hdr->len) < sizeof(*req))
 276                 return -EINVAL;
 277
 278         BT_DBG("id %d", req->id);
 279
 280         hdev = hci_dev_get(req->id);
 281         if (!hdev || hdev->dev_type != HCI_AMP) {
 282                 struct a2mp_info_rsp rsp;
 283
 284                 rsp.id = req->id;
 285                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 286
 287                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 288                           &rsp);
 289
 290                 goto done;
 291         }
 292
 293         set_bit(READ_LOC_AMP_INFO, &mgr->state);
 294         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 295
 296 done:
 297         if (hdev)
 298                 hci_dev_put(hdev);
 299
 300         skb_pull(skb, sizeof(*req));
 301         return 0;
 302 }
 303
 304 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 305                             struct a2mp_cmd *hdr)
 306 {
 307         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
 308         struct a2mp_amp_assoc_req req;
 309         struct amp_ctrl *ctrl;
 310
 311         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
 312                 return -EINVAL;
 313
 314         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
 315
 316         if (rsp->status)
 317                 return -EINVAL;
 318
 319         ctrl = amp_ctrl_add(mgr, rsp->id);
 320         if (!ctrl)
 321                 return -ENOMEM;
 322
 323         req.id = rsp->id;
 324         a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
 325                   &req);
 326
 327         skb_pull(skb, sizeof(*rsp));
 328         return 0;
 329 }
 330
 331 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
 332                                 struct a2mp_cmd *hdr)
 333 {
 334         struct a2mp_amp_assoc_req *req = (void *) skb->data;
 335         struct hci_dev *hdev;
 336         struct amp_mgr *tmp;
 337
 338         if (le16_to_cpu(hdr->len) < sizeof(*req))
 339                 return -EINVAL;
 340
 341         BT_DBG("id %d", req->id);
 342
 343         /* Make sure that other request is not processed */
 344         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 345
 346         hdev = hci_dev_get(req->id);
 347         if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
 348                 struct a2mp_amp_assoc_rsp rsp;
 349                 rsp.id = req->id;
 350
 351                 if (tmp) {
 352                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 353                         amp_mgr_put(tmp);
 354                 } else {
 355                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 356                 }
 357
 358                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 359                           &rsp);
 360
 361                 goto done;
 362         }
 363
 364         amp_read_loc_assoc(hdev, mgr);
 365
 366 done:
 367         if (hdev)
 368                 hci_dev_put(hdev);
 369
 370         skb_pull(skb, sizeof(*req));
 371         return 0;
 372 }
 373
 374 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 375                                 struct a2mp_cmd *hdr)
 376 {
 377         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
 378         u16 len = le16_to_cpu(hdr->len);
 379         struct hci_dev *hdev;
 380         struct amp_ctrl *ctrl;
 381         struct hci_conn *hcon;
 382         size_t assoc_len;
 383
 384         if (len < sizeof(*rsp))
 385                 return -EINVAL;
 386
 387         assoc_len = len - sizeof(*rsp);
 388
 389         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
 390                assoc_len);
 391
 392         if (rsp->status)
 393                 return -EINVAL;
 394
 395         /* Save remote ASSOC data */
 396         ctrl = amp_ctrl_lookup(mgr, rsp->id);
 397         if (ctrl) {
 398                 u8 *assoc;
 399
 400                 assoc = kzalloc(assoc_len, GFP_KERNEL);
 401                 if (!assoc) {
 402                         amp_ctrl_put(ctrl);
 403                         return -ENOMEM;
 404                 }
 405
 406                 memcpy(assoc, rsp->amp_assoc, assoc_len);
 407                 ctrl->assoc = assoc;
 408                 ctrl->assoc_len = assoc_len;
 409                 ctrl->assoc_rem_len = assoc_len;
 410                 ctrl->assoc_len_so_far = 0;
 411
 412                 amp_ctrl_put(ctrl);
 413         }
 414
 415         /* Create Phys Link */
 416         hdev = hci_dev_get(rsp->id);
 417         if (!hdev)
 418                 return -EINVAL;
 419
 420         hcon = phylink_add(hdev, mgr, rsp->id, true);
 421         if (!hcon)
 422                 goto done;
 423
 424         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
 425
 426         mgr->bredr_chan->remote_amp_id = rsp->id;
 427
 428         amp_create_phylink(hdev, mgr, hcon);
 429
 430 done:
 431         hci_dev_put(hdev);
 432         skb_pull(skb, len);
 433         return 0;
 434 }
 435
 436 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 437                                    struct a2mp_cmd *hdr)
 438 {
 439         struct a2mp_physlink_req *req = (void *) skb->data;
 440
 441         struct a2mp_physlink_rsp rsp;
 442         struct hci_dev *hdev;
 443         struct hci_conn *hcon;
 444         struct amp_ctrl *ctrl;
 445
 446         if (le16_to_cpu(hdr->len) < sizeof(*req))
 447                 return -EINVAL;
 448
 449         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 450
 451         rsp.local_id = req->remote_id;
 452         rsp.remote_id = req->local_id;
 453
 454         hdev = hci_dev_get(req->remote_id);
 455         if (!hdev || hdev->amp_type != HCI_AMP) {
 456                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 457                 goto send_rsp;
 458         }
 459
 460         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
 461         if (!ctrl) {
 462                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
 463                 if (ctrl) {
 464                         amp_ctrl_get(ctrl);
 465                 } else {
 466                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 467                         goto send_rsp;
 468                 }
 469         }
 470
 471         if (ctrl) {
 472                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
 473                 u8 *assoc;
 474
 475                 assoc = kzalloc(assoc_len, GFP_KERNEL);
 476                 if (!assoc) {
 477                         amp_ctrl_put(ctrl);
 478                         return -ENOMEM;
 479                 }
 480
 481                 memcpy(assoc, req->amp_assoc, assoc_len);
 482                 ctrl->assoc = assoc;
 483                 ctrl->assoc_len = assoc_len;
 484                 ctrl->assoc_rem_len = assoc_len;
 485                 ctrl->assoc_len_so_far = 0;
 486
 487                 amp_ctrl_put(ctrl);
 488         }
 489
 490         hcon = phylink_add(hdev, mgr, req->local_id, false);
 491         if (hcon) {
 492                 amp_accept_phylink(hdev, mgr, hcon);
 493                 rsp.status = A2MP_STATUS_SUCCESS;
 494         } else {
 495                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 496         }
 497
 498 send_rsp:
 499         if (hdev)
 500                 hci_dev_put(hdev);
 501
 502         /* Reply error now and success after HCI Write Remote AMP Assoc
 503            command complete with success status
 504          */
 505         if (rsp.status != A2MP_STATUS_SUCCESS) {
 506                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 507                           sizeof(rsp), &rsp);
 508         } else {
 509                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 510                 mgr->ident = hdr->ident;
 511         }
 512
 513         skb_pull(skb, le16_to_cpu(hdr->len));
 514         return 0;
 515 }
 516
 517 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 518                                  struct a2mp_cmd *hdr)
 519 {
 520         struct a2mp_physlink_req *req = (void *) skb->data;
 521         struct a2mp_physlink_rsp rsp;
 522         struct hci_dev *hdev;
 523         struct hci_conn *hcon;
 524
 525         if (le16_to_cpu(hdr->len) < sizeof(*req))
 526                 return -EINVAL;
 527
 528         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 529
 530         rsp.local_id = req->remote_id;
 531         rsp.remote_id = req->local_id;
 532         rsp.status = A2MP_STATUS_SUCCESS;
 533
 534         hdev = hci_dev_get(req->remote_id);
 535         if (!hdev) {
 536                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 537                 goto send_rsp;
 538         }
 539
 540         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
 541         if (!hcon) {
 542                 BT_ERR("No phys link exist");
 543                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 544                 goto clean;
 545         }
 546
 547         /* TODO Disconnect Phys Link here */
 548
 549 clean:
 550         hci_dev_put(hdev);
 551
 552 send_rsp:
 553         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 554
 555         skb_pull(skb, sizeof(*req));
 556         return 0;
 557 }
 558
 559 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 560                                struct a2mp_cmd *hdr)
 561 {
 562         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 563
 564         skb_pull(skb, le16_to_cpu(hdr->len));
 565         return 0;
 566 }
 567
 568 /* Handle A2MP signalling */
 569 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 570 {
 571         struct a2mp_cmd *hdr;
 572         struct amp_mgr *mgr = chan->data;
 573         int err = 0;
 574
 575         amp_mgr_get(mgr);
 576
 577         while (skb->len >= sizeof(*hdr)) {
 578                 u16 len;
 579
 580                 hdr = (void *) skb->data;
 581                 len = le16_to_cpu(hdr->len);
 582
 583                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 584
 585                 skb_pull(skb, sizeof(*hdr));
 586
 587                 if (len > skb->len || !hdr->ident) {
 588                         err = -EINVAL;
 589                         break;
 590                 }
 591
 592                 mgr->ident = hdr->ident;
 593
 594                 switch (hdr->code) {
 595                 case A2MP_COMMAND_REJ:
 596                         a2mp_command_rej(mgr, skb, hdr);
 597                         break;
 598
 599                 case A2MP_DISCOVER_REQ:
 600                         err = a2mp_discover_req(mgr, skb, hdr);
 601                         break;
 602
 603                 case A2MP_CHANGE_NOTIFY:
 604                         err = a2mp_change_notify(mgr, skb, hdr);
 605                         break;
 606
 607                 case A2MP_GETINFO_REQ:
 608                         err = a2mp_getinfo_req(mgr, skb, hdr);
 609                         break;
 610
 611                 case A2MP_GETAMPASSOC_REQ:
 612                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 613                         break;
 614
 615                 case A2MP_CREATEPHYSLINK_REQ:
 616                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 617                         break;
 618
 619                 case A2MP_DISCONNPHYSLINK_REQ:
 620                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 621                         break;
 622
 623                 case A2MP_DISCOVER_RSP:
 624                         err = a2mp_discover_rsp(mgr, skb, hdr);
 625                         break;
 626
 627                 case A2MP_GETINFO_RSP:
 628                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
 629                         break;
 630
 631                 case A2MP_GETAMPASSOC_RSP:
 632                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
 633                         break;
 634
 635                 case A2MP_CHANGE_RSP:
 636                 case A2MP_CREATEPHYSLINK_RSP:
 637                 case A2MP_DISCONNPHYSLINK_RSP:
 638                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 639                         break;
 640
 641                 default:
 642                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 643                         err = -EINVAL;
 644                         break;
 645                 }
 646         }
 647
 648         if (err) {
 649                 struct a2mp_cmd_rej rej;
 650
 651                 rej.reason = __constant_cpu_to_le16(0);
 652                 hdr = (void *) skb->data;
 653
 654                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 655
 656                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 657                           &rej);
 658         }
 659
 660         /* Always free skb and return success error code to prevent
 661            from sending L2CAP Disconnect over A2MP channel */
 662         kfree_skb(skb);
 663
 664         amp_mgr_put(mgr);
 665
 666         return 0;
 667 }
 668
 669 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 670 {
 671         l2cap_chan_put(chan);
 672 }
 673
 674 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
 675 {
 676         struct amp_mgr *mgr = chan->data;
 677
 678         if (!mgr)
 679                 return;
 680
 681         BT_DBG("chan %p state %s", chan, state_to_string(state));
 682
 683         chan->state = state;
 684
 685         switch (state) {
 686         case BT_CLOSED:
 687                 if (mgr)
 688                         amp_mgr_put(mgr);
 689                 break;
 690         }
 691 }
 692
 693 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 694                                               unsigned long len, int nb)
 695 {
 696         return bt_skb_alloc(len, GFP_KERNEL);
 697 }
 698
 699 static struct l2cap_ops a2mp_chan_ops = {
 700         .name = "L2CAP A2MP channel",
 701         .recv = a2mp_chan_recv_cb,
 702         .close = a2mp_chan_close_cb,
 703         .state_change = a2mp_chan_state_change_cb,
 704         .alloc_skb = a2mp_chan_alloc_skb_cb,
 705
 706         /* Not implemented for A2MP */
 707         .new_connection = l2cap_chan_no_new_connection,
 708         .teardown = l2cap_chan_no_teardown,
 709         .ready = l2cap_chan_no_ready,
 710         .defer = l2cap_chan_no_defer,
 711 };
 712
 713 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 714 {
 715         struct l2cap_chan *chan;
 716         int err;
 717
 718         chan = l2cap_chan_create();
 719         if (!chan)
 720                 return NULL;
 721
 722         BT_DBG("chan %p", chan);
 723
 724         chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
 725         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 726
 727         chan->ops = &a2mp_chan_ops;
 728
 729         l2cap_chan_set_defaults(chan);
 730         chan->remote_max_tx = chan->max_tx;
 731         chan->remote_tx_win = chan->tx_win;
 732
 733         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 734         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 735
 736         skb_queue_head_init(&chan->tx_q);
 737
 738         chan->mode = L2CAP_MODE_ERTM;
 739
 740         err = l2cap_ertm_init(chan);
 741         if (err < 0) {
 742                 l2cap_chan_del(chan, 0);
 743                 return NULL;
 744         }
 745
 746         chan->conf_state = 0;
 747
 748         if (locked)
 749                 __l2cap_chan_add(conn, chan);
 750         else
 751                 l2cap_chan_add(conn, chan);
 752
 753         chan->remote_mps = chan->omtu;
 754         chan->mps = chan->omtu;
 755
 756         chan->state = BT_CONNECTED;
 757
 758         return chan;
 759 }
 760
 761 /* AMP Manager functions */
 762 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 763 {
 764         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 765
 766         kref_get(&mgr->kref);
 767
 768         return mgr;
 769 }
 770
 771 static void amp_mgr_destroy(struct kref *kref)
 772 {
 773         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 774
 775         BT_DBG("mgr %p", mgr);
 776
 777         mutex_lock(&amp_mgr_list_lock);
 778         list_del(&mgr->list);
 779         mutex_unlock(&amp_mgr_list_lock);
 780
 781         amp_ctrl_list_flush(mgr);
 782         kfree(mgr);
 783 }
 784
 785 int amp_mgr_put(struct amp_mgr *mgr)
 786 {
 787         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 788
 789         return kref_put(&mgr->kref, &amp_mgr_destroy);
 790 }
 791
 792 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 793 {
 794         struct amp_mgr *mgr;
 795         struct l2cap_chan *chan;
 796
 797         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 798         if (!mgr)
 799                 return NULL;
 800
 801         BT_DBG("conn %p mgr %p", conn, mgr);
 802
 803         mgr->l2cap_conn = conn;
 804
 805         chan = a2mp_chan_open(conn, locked);
 806         if (!chan) {
 807                 kfree(mgr);
 808                 return NULL;
 809         }
 810
 811         mgr->a2mp_chan = chan;
 812         chan->data = mgr;
 813
 814         conn->hcon->amp_mgr = mgr;
 815
 816         kref_init(&mgr->kref);
 817
 818         /* Remote AMP ctrl list initialization */
 819         INIT_LIST_HEAD(&mgr->amp_ctrls);
 820         mutex_init(&mgr->amp_ctrls_lock);
 821
 822         mutex_lock(&amp_mgr_list_lock);
 823         list_add(&mgr->list, &amp_mgr_list);
 824         mutex_unlock(&amp_mgr_list_lock);
 825
 826         return mgr;
 827 }
 828
 829 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 830                                        struct sk_buff *skb)
 831 {
 832         struct amp_mgr *mgr;
 833
 834         mgr = amp_mgr_create(conn, false);
 835         if (!mgr) {
 836                 BT_ERR("Could not create AMP manager");
 837                 return NULL;
 838         }
 839
 840         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 841
 842         return mgr->a2mp_chan;
 843 }
 844
 845 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
 846 {
 847         struct amp_mgr *mgr;
 848
 849         mutex_lock(&amp_mgr_list_lock);
 850         list_for_each_entry(mgr, &amp_mgr_list, list) {
 851                 if (test_and_clear_bit(state, &mgr->state)) {
 852                         amp_mgr_get(mgr);
 853                         mutex_unlock(&amp_mgr_list_lock);
 854                         return mgr;
 855                 }
 856         }
 857         mutex_unlock(&amp_mgr_list_lock);
 858
 859         return NULL;
 860 }
 861
 862 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 863 {
 864         struct amp_mgr *mgr;
 865         struct a2mp_info_rsp rsp;
 866
 867         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 868         if (!mgr)
 869                 return;
 870
 871         BT_DBG("%s mgr %p", hdev->name, mgr);
 872
 873         rsp.id = hdev->id;
 874         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 875
 876         if (hdev->amp_type != HCI_BREDR) {
 877                 rsp.status = 0;
 878                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 879                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 880                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 881                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 882                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 883         }
 884
 885         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 886         amp_mgr_put(mgr);
 887 }
 888
 889 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 890 {
 891         struct amp_mgr *mgr;
 892         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 893         struct a2mp_amp_assoc_rsp *rsp;
 894         size_t len;
 895
 896         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 897         if (!mgr)
 898                 return;
 899
 900         BT_DBG("%s mgr %p", hdev->name, mgr);
 901
 902         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 903         rsp = kzalloc(len, GFP_KERNEL);
 904         if (!rsp) {
 905                 amp_mgr_put(mgr);
 906                 return;
 907         }
 908
 909         rsp->id = hdev->id;
 910
 911         if (status) {
 912                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 913         } else {
 914                 rsp->status = A2MP_STATUS_SUCCESS;
 915                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 916         }
 917
 918         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 919         amp_mgr_put(mgr);
 920         kfree(rsp);
 921 }
 922
 923 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 924 {
 925         struct amp_mgr *mgr;
 926         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 927         struct a2mp_physlink_req *req;
 928         struct l2cap_chan *bredr_chan;
 929         size_t len;
 930
 931         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 932         if (!mgr)
 933                 return;
 934
 935         len = sizeof(*req) + loc_assoc->len;
 936
 937         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 938
 939         req = kzalloc(len, GFP_KERNEL);
 940         if (!req) {
 941                 amp_mgr_put(mgr);
 942                 return;
 943         }
 944
 945         bredr_chan = mgr->bredr_chan;
 946         if (!bredr_chan)
 947                 goto clean;
 948
 949         req->local_id = hdev->id;
 950         req->remote_id = bredr_chan->remote_amp_id;
 951         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
 952
 953         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
 954
 955 clean:
 956         amp_mgr_put(mgr);
 957         kfree(req);
 958 }
 959
 960 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
 961 {
 962         struct amp_mgr *mgr;
 963         struct a2mp_physlink_rsp rsp;
 964         struct hci_conn *hs_hcon;
 965
 966         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
 967         if (!mgr)
 968                 return;
 969
 970         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
 971         if (!hs_hcon) {
 972                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 973         } else {
 974                 rsp.remote_id = hs_hcon->remote_id;
 975                 rsp.status = A2MP_STATUS_SUCCESS;
 976         }
 977
 978         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
 979                status);
 980
 981         rsp.local_id = hdev->id;
 982         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
 983         amp_mgr_put(mgr);
 984 }
 985
 986 void a2mp_discover_amp(struct l2cap_chan *chan)
 987 {
 988         struct l2cap_conn *conn = chan->conn;
 989         struct amp_mgr *mgr = conn->hcon->amp_mgr;
 990         struct a2mp_discov_req req;
 991
 992         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
 993
 994         if (!mgr) {
 995                 mgr = amp_mgr_create(conn, true);
 996                 if (!mgr)
 997                         return;
 998         }
 999
1000         mgr->bredr_chan = chan;
1001
1002         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1003         req.ext_feat = 0;
1004         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1005 }