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 = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
 401                 if (!assoc) {
 402                         amp_ctrl_put(ctrl);
 403                         return -ENOMEM;
 404                 }
 405
 406                 ctrl->assoc = assoc;
 407                 ctrl->assoc_len = assoc_len;
 408                 ctrl->assoc_rem_len = assoc_len;
 409                 ctrl->assoc_len_so_far = 0;
 410
 411                 amp_ctrl_put(ctrl);
 412         }
 413
 414         /* Create Phys Link */
 415         hdev = hci_dev_get(rsp->id);
 416         if (!hdev)
 417                 return -EINVAL;
 418
 419         hcon = phylink_add(hdev, mgr, rsp->id, true);
 420         if (!hcon)
 421                 goto done;
 422
 423         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
 424
 425         mgr->bredr_chan->remote_amp_id = rsp->id;
 426
 427         amp_create_phylink(hdev, mgr, hcon);
 428
 429 done:
 430         hci_dev_put(hdev);
 431         skb_pull(skb, len);
 432         return 0;
 433 }
 434
 435 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 436                                    struct a2mp_cmd *hdr)
 437 {
 438         struct a2mp_physlink_req *req = (void *) skb->data;
 439
 440         struct a2mp_physlink_rsp rsp;
 441         struct hci_dev *hdev;
 442         struct hci_conn *hcon;
 443         struct amp_ctrl *ctrl;
 444
 445         if (le16_to_cpu(hdr->len) < sizeof(*req))
 446                 return -EINVAL;
 447
 448         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 449
 450         rsp.local_id = req->remote_id;
 451         rsp.remote_id = req->local_id;
 452
 453         hdev = hci_dev_get(req->remote_id);
 454         if (!hdev || hdev->amp_type != HCI_AMP) {
 455                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 456                 goto send_rsp;
 457         }
 458
 459         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
 460         if (!ctrl) {
 461                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
 462                 if (ctrl) {
 463                         amp_ctrl_get(ctrl);
 464                 } else {
 465                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 466                         goto send_rsp;
 467                 }
 468         }
 469
 470         if (ctrl) {
 471                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
 472                 u8 *assoc;
 473
 474                 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
 475                 if (!assoc) {
 476                         amp_ctrl_put(ctrl);
 477                         return -ENOMEM;
 478                 }
 479
 480                 ctrl->assoc = assoc;
 481                 ctrl->assoc_len = assoc_len;
 482                 ctrl->assoc_rem_len = assoc_len;
 483                 ctrl->assoc_len_so_far = 0;
 484
 485                 amp_ctrl_put(ctrl);
 486         }
 487
 488         hcon = phylink_add(hdev, mgr, req->local_id, false);
 489         if (hcon) {
 490                 amp_accept_phylink(hdev, mgr, hcon);
 491                 rsp.status = A2MP_STATUS_SUCCESS;
 492         } else {
 493                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 494         }
 495
 496 send_rsp:
 497         if (hdev)
 498                 hci_dev_put(hdev);
 499
 500         /* Reply error now and success after HCI Write Remote AMP Assoc
 501            command complete with success status
 502          */
 503         if (rsp.status != A2MP_STATUS_SUCCESS) {
 504                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 505                           sizeof(rsp), &rsp);
 506         } else {
 507                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 508                 mgr->ident = hdr->ident;
 509         }
 510
 511         skb_pull(skb, le16_to_cpu(hdr->len));
 512         return 0;
 513 }
 514
 515 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 516                                  struct a2mp_cmd *hdr)
 517 {
 518         struct a2mp_physlink_req *req = (void *) skb->data;
 519         struct a2mp_physlink_rsp rsp;
 520         struct hci_dev *hdev;
 521         struct hci_conn *hcon;
 522
 523         if (le16_to_cpu(hdr->len) < sizeof(*req))
 524                 return -EINVAL;
 525
 526         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 527
 528         rsp.local_id = req->remote_id;
 529         rsp.remote_id = req->local_id;
 530         rsp.status = A2MP_STATUS_SUCCESS;
 531
 532         hdev = hci_dev_get(req->remote_id);
 533         if (!hdev) {
 534                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 535                 goto send_rsp;
 536         }
 537
 538         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
 539         if (!hcon) {
 540                 BT_ERR("No phys link exist");
 541                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 542                 goto clean;
 543         }
 544
 545         /* TODO Disconnect Phys Link here */
 546
 547 clean:
 548         hci_dev_put(hdev);
 549
 550 send_rsp:
 551         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 552
 553         skb_pull(skb, sizeof(*req));
 554         return 0;
 555 }
 556
 557 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 558                                struct a2mp_cmd *hdr)
 559 {
 560         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 561
 562         skb_pull(skb, le16_to_cpu(hdr->len));
 563         return 0;
 564 }
 565
 566 /* Handle A2MP signalling */
 567 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 568 {
 569         struct a2mp_cmd *hdr;
 570         struct amp_mgr *mgr = chan->data;
 571         int err = 0;
 572
 573         amp_mgr_get(mgr);
 574
 575         while (skb->len >= sizeof(*hdr)) {
 576                 u16 len;
 577
 578                 hdr = (void *) skb->data;
 579                 len = le16_to_cpu(hdr->len);
 580
 581                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 582
 583                 skb_pull(skb, sizeof(*hdr));
 584
 585                 if (len > skb->len || !hdr->ident) {
 586                         err = -EINVAL;
 587                         break;
 588                 }
 589
 590                 mgr->ident = hdr->ident;
 591
 592                 switch (hdr->code) {
 593                 case A2MP_COMMAND_REJ:
 594                         a2mp_command_rej(mgr, skb, hdr);
 595                         break;
 596
 597                 case A2MP_DISCOVER_REQ:
 598                         err = a2mp_discover_req(mgr, skb, hdr);
 599                         break;
 600
 601                 case A2MP_CHANGE_NOTIFY:
 602                         err = a2mp_change_notify(mgr, skb, hdr);
 603                         break;
 604
 605                 case A2MP_GETINFO_REQ:
 606                         err = a2mp_getinfo_req(mgr, skb, hdr);
 607                         break;
 608
 609                 case A2MP_GETAMPASSOC_REQ:
 610                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 611                         break;
 612
 613                 case A2MP_CREATEPHYSLINK_REQ:
 614                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 615                         break;
 616
 617                 case A2MP_DISCONNPHYSLINK_REQ:
 618                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 619                         break;
 620
 621                 case A2MP_DISCOVER_RSP:
 622                         err = a2mp_discover_rsp(mgr, skb, hdr);
 623                         break;
 624
 625                 case A2MP_GETINFO_RSP:
 626                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
 627                         break;
 628
 629                 case A2MP_GETAMPASSOC_RSP:
 630                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
 631                         break;
 632
 633                 case A2MP_CHANGE_RSP:
 634                 case A2MP_CREATEPHYSLINK_RSP:
 635                 case A2MP_DISCONNPHYSLINK_RSP:
 636                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 637                         break;
 638
 639                 default:
 640                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 641                         err = -EINVAL;
 642                         break;
 643                 }
 644         }
 645
 646         if (err) {
 647                 struct a2mp_cmd_rej rej;
 648
 649                 rej.reason = __constant_cpu_to_le16(0);
 650                 hdr = (void *) skb->data;
 651
 652                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 653
 654                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 655                           &rej);
 656         }
 657
 658         /* Always free skb and return success error code to prevent
 659            from sending L2CAP Disconnect over A2MP channel */
 660         kfree_skb(skb);
 661
 662         amp_mgr_put(mgr);
 663
 664         return 0;
 665 }
 666
 667 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 668 {
 669         l2cap_chan_put(chan);
 670 }
 671
 672 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
 673 {
 674         struct amp_mgr *mgr = chan->data;
 675
 676         if (!mgr)
 677                 return;
 678
 679         BT_DBG("chan %p state %s", chan, state_to_string(state));
 680
 681         chan->state = state;
 682
 683         switch (state) {
 684         case BT_CLOSED:
 685                 if (mgr)
 686                         amp_mgr_put(mgr);
 687                 break;
 688         }
 689 }
 690
 691 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 692                                               unsigned long len, int nb)
 693 {
 694         return bt_skb_alloc(len, GFP_KERNEL);
 695 }
 696
 697 static struct l2cap_ops a2mp_chan_ops = {
 698         .name = "L2CAP A2MP channel",
 699         .recv = a2mp_chan_recv_cb,
 700         .close = a2mp_chan_close_cb,
 701         .state_change = a2mp_chan_state_change_cb,
 702         .alloc_skb = a2mp_chan_alloc_skb_cb,
 703
 704         /* Not implemented for A2MP */
 705         .new_connection = l2cap_chan_no_new_connection,
 706         .teardown = l2cap_chan_no_teardown,
 707         .ready = l2cap_chan_no_ready,
 708         .defer = l2cap_chan_no_defer,
 709 };
 710
 711 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 712 {
 713         struct l2cap_chan *chan;
 714         int err;
 715
 716         chan = l2cap_chan_create();
 717         if (!chan)
 718                 return NULL;
 719
 720         BT_DBG("chan %p", chan);
 721
 722         chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
 723         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 724
 725         chan->ops = &a2mp_chan_ops;
 726
 727         l2cap_chan_set_defaults(chan);
 728         chan->remote_max_tx = chan->max_tx;
 729         chan->remote_tx_win = chan->tx_win;
 730
 731         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 732         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 733
 734         skb_queue_head_init(&chan->tx_q);
 735
 736         chan->mode = L2CAP_MODE_ERTM;
 737
 738         err = l2cap_ertm_init(chan);
 739         if (err < 0) {
 740                 l2cap_chan_del(chan, 0);
 741                 return NULL;
 742         }
 743
 744         chan->conf_state = 0;
 745
 746         if (locked)
 747                 __l2cap_chan_add(conn, chan);
 748         else
 749                 l2cap_chan_add(conn, chan);
 750
 751         chan->remote_mps = chan->omtu;
 752         chan->mps = chan->omtu;
 753
 754         chan->state = BT_CONNECTED;
 755
 756         return chan;
 757 }
 758
 759 /* AMP Manager functions */
 760 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 761 {
 762         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 763
 764         kref_get(&mgr->kref);
 765
 766         return mgr;
 767 }
 768
 769 static void amp_mgr_destroy(struct kref *kref)
 770 {
 771         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 772
 773         BT_DBG("mgr %p", mgr);
 774
 775         mutex_lock(&amp_mgr_list_lock);
 776         list_del(&mgr->list);
 777         mutex_unlock(&amp_mgr_list_lock);
 778
 779         amp_ctrl_list_flush(mgr);
 780         kfree(mgr);
 781 }
 782
 783 int amp_mgr_put(struct amp_mgr *mgr)
 784 {
 785         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 786
 787         return kref_put(&mgr->kref, &amp_mgr_destroy);
 788 }
 789
 790 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 791 {
 792         struct amp_mgr *mgr;
 793         struct l2cap_chan *chan;
 794
 795         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 796         if (!mgr)
 797                 return NULL;
 798
 799         BT_DBG("conn %p mgr %p", conn, mgr);
 800
 801         mgr->l2cap_conn = conn;
 802
 803         chan = a2mp_chan_open(conn, locked);
 804         if (!chan) {
 805                 kfree(mgr);
 806                 return NULL;
 807         }
 808
 809         mgr->a2mp_chan = chan;
 810         chan->data = mgr;
 811
 812         conn->hcon->amp_mgr = mgr;
 813
 814         kref_init(&mgr->kref);
 815
 816         /* Remote AMP ctrl list initialization */
 817         INIT_LIST_HEAD(&mgr->amp_ctrls);
 818         mutex_init(&mgr->amp_ctrls_lock);
 819
 820         mutex_lock(&amp_mgr_list_lock);
 821         list_add(&mgr->list, &amp_mgr_list);
 822         mutex_unlock(&amp_mgr_list_lock);
 823
 824         return mgr;
 825 }
 826
 827 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 828                                        struct sk_buff *skb)
 829 {
 830         struct amp_mgr *mgr;
 831
 832         mgr = amp_mgr_create(conn, false);
 833         if (!mgr) {
 834                 BT_ERR("Could not create AMP manager");
 835                 return NULL;
 836         }
 837
 838         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 839
 840         return mgr->a2mp_chan;
 841 }
 842
 843 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
 844 {
 845         struct amp_mgr *mgr;
 846
 847         mutex_lock(&amp_mgr_list_lock);
 848         list_for_each_entry(mgr, &amp_mgr_list, list) {
 849                 if (test_and_clear_bit(state, &mgr->state)) {
 850                         amp_mgr_get(mgr);
 851                         mutex_unlock(&amp_mgr_list_lock);
 852                         return mgr;
 853                 }
 854         }
 855         mutex_unlock(&amp_mgr_list_lock);
 856
 857         return NULL;
 858 }
 859
 860 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 861 {
 862         struct amp_mgr *mgr;
 863         struct a2mp_info_rsp rsp;
 864
 865         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 866         if (!mgr)
 867                 return;
 868
 869         BT_DBG("%s mgr %p", hdev->name, mgr);
 870
 871         rsp.id = hdev->id;
 872         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 873
 874         if (hdev->amp_type != HCI_BREDR) {
 875                 rsp.status = 0;
 876                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 877                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 878                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 879                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 880                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 881         }
 882
 883         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 884         amp_mgr_put(mgr);
 885 }
 886
 887 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 888 {
 889         struct amp_mgr *mgr;
 890         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 891         struct a2mp_amp_assoc_rsp *rsp;
 892         size_t len;
 893
 894         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 895         if (!mgr)
 896                 return;
 897
 898         BT_DBG("%s mgr %p", hdev->name, mgr);
 899
 900         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 901         rsp = kzalloc(len, GFP_KERNEL);
 902         if (!rsp) {
 903                 amp_mgr_put(mgr);
 904                 return;
 905         }
 906
 907         rsp->id = hdev->id;
 908
 909         if (status) {
 910                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 911         } else {
 912                 rsp->status = A2MP_STATUS_SUCCESS;
 913                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 914         }
 915
 916         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 917         amp_mgr_put(mgr);
 918         kfree(rsp);
 919 }
 920
 921 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 922 {
 923         struct amp_mgr *mgr;
 924         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 925         struct a2mp_physlink_req *req;
 926         struct l2cap_chan *bredr_chan;
 927         size_t len;
 928
 929         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 930         if (!mgr)
 931                 return;
 932
 933         len = sizeof(*req) + loc_assoc->len;
 934
 935         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 936
 937         req = kzalloc(len, GFP_KERNEL);
 938         if (!req) {
 939                 amp_mgr_put(mgr);
 940                 return;
 941         }
 942
 943         bredr_chan = mgr->bredr_chan;
 944         if (!bredr_chan)
 945                 goto clean;
 946
 947         req->local_id = hdev->id;
 948         req->remote_id = bredr_chan->remote_amp_id;
 949         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
 950
 951         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
 952
 953 clean:
 954         amp_mgr_put(mgr);
 955         kfree(req);
 956 }
 957
 958 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
 959 {
 960         struct amp_mgr *mgr;
 961         struct a2mp_physlink_rsp rsp;
 962         struct hci_conn *hs_hcon;
 963
 964         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
 965         if (!mgr)
 966                 return;
 967
 968         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
 969         if (!hs_hcon) {
 970                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 971         } else {
 972                 rsp.remote_id = hs_hcon->remote_id;
 973                 rsp.status = A2MP_STATUS_SUCCESS;
 974         }
 975
 976         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
 977                status);
 978
 979         rsp.local_id = hdev->id;
 980         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
 981         amp_mgr_put(mgr);
 982 }
 983
 984 void a2mp_discover_amp(struct l2cap_chan *chan)
 985 {
 986         struct l2cap_conn *conn = chan->conn;
 987         struct amp_mgr *mgr = conn->hcon->amp_mgr;
 988         struct a2mp_discov_req req;
 989
 990         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
 991
 992         if (!mgr) {
 993                 mgr = amp_mgr_create(conn, true);
 994                 if (!mgr)
 995                         return;
 996         }
 997
 998         mgr->bredr_chan = chan;
 999
1000         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1001         req.ext_feat = 0;
1002         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1003 }