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
  19 #include "a2mp.h"
  20 #include "amp.h"
  21
  22 /* Global AMP Manager list */
  23 LIST_HEAD(amp_mgr_list);
  24 DEFINE_MUTEX(amp_mgr_list_lock);
  25
  26 /* A2MP build & send command helper functions */
  27 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
  28 {
  29         struct a2mp_cmd *cmd;
  30         int plen;
  31
  32         plen = sizeof(*cmd) + len;
  33         cmd = kzalloc(plen, GFP_KERNEL);
  34         if (!cmd)
  35                 return NULL;
  36
  37         cmd->code = code;
  38         cmd->ident = ident;
  39         cmd->len = cpu_to_le16(len);
  40
  41         memcpy(cmd->data, data, len);
  42
  43         return cmd;
  44 }
  45
  46 void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
  47 {
  48         struct l2cap_chan *chan = mgr->a2mp_chan;
  49         struct a2mp_cmd *cmd;
  50         u16 total_len = len + sizeof(*cmd);
  51         struct kvec iv;
  52         struct msghdr msg;
  53
  54         cmd = __a2mp_build(code, ident, len, data);
  55         if (!cmd)
  56                 return;
  57
  58         iv.iov_base = cmd;
  59         iv.iov_len = total_len;
  60
  61         memset(&msg, 0, sizeof(msg));
  62
  63         iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, total_len);
  64
  65         l2cap_chan_send(chan, &msg, total_len);
  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 /* hci_dev_list shall be locked */
  79 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl)
  80 {
  81         struct hci_dev *hdev;
  82         int i = 1;
  83
  84         cl[0].id = AMP_ID_BREDR;
  85         cl[0].type = AMP_TYPE_BREDR;
  86         cl[0].status = AMP_STATUS_BLUETOOTH_ONLY;
  87
  88         list_for_each_entry(hdev, &hci_dev_list, list) {
  89                 if (hdev->dev_type == HCI_AMP) {
  90                         cl[i].id = hdev->id;
  91                         cl[i].type = hdev->amp_type;
  92                         if (test_bit(HCI_UP, &hdev->flags))
  93                                 cl[i].status = hdev->amp_status;
  94                         else
  95                                 cl[i].status = AMP_STATUS_POWERED_DOWN;
  96                         i++;
  97                 }
  98         }
  99 }
 100
 101 /* Processing A2MP messages */
 102 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
 103                             struct a2mp_cmd *hdr)
 104 {
 105         struct a2mp_cmd_rej *rej = (void *) skb->data;
 106
 107         if (le16_to_cpu(hdr->len) < sizeof(*rej))
 108                 return -EINVAL;
 109
 110         BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
 111
 112         skb_pull(skb, sizeof(*rej));
 113
 114         return 0;
 115 }
 116
 117 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
 118                              struct a2mp_cmd *hdr)
 119 {
 120         struct a2mp_discov_req *req = (void *) skb->data;
 121         u16 len = le16_to_cpu(hdr->len);
 122         struct a2mp_discov_rsp *rsp;
 123         u16 ext_feat;
 124         u8 num_ctrl;
 125         struct hci_dev *hdev;
 126
 127         if (len < sizeof(*req))
 128                 return -EINVAL;
 129
 130         skb_pull(skb, sizeof(*req));
 131
 132         ext_feat = le16_to_cpu(req->ext_feat);
 133
 134         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
 135
 136         /* check that packet is not broken for now */
 137         while (ext_feat & A2MP_FEAT_EXT) {
 138                 if (len < sizeof(ext_feat))
 139                         return -EINVAL;
 140
 141                 ext_feat = get_unaligned_le16(skb->data);
 142                 BT_DBG("efm 0x%4.4x", ext_feat);
 143                 len -= sizeof(ext_feat);
 144                 skb_pull(skb, sizeof(ext_feat));
 145         }
 146
 147         read_lock(&hci_dev_list_lock);
 148
 149         /* at minimum the BR/EDR needs to be listed */
 150         num_ctrl = 1;
 151
 152         list_for_each_entry(hdev, &hci_dev_list, list) {
 153                 if (hdev->dev_type == HCI_AMP)
 154                         num_ctrl++;
 155         }
 156
 157         len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
 158         rsp = kmalloc(len, GFP_ATOMIC);
 159         if (!rsp) {
 160                 read_unlock(&hci_dev_list_lock);
 161                 return -ENOMEM;
 162         }
 163
 164         rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
 165         rsp->ext_feat = 0;
 166
 167         __a2mp_add_cl(mgr, rsp->cl);
 168
 169         read_unlock(&hci_dev_list_lock);
 170
 171         a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
 172
 173         kfree(rsp);
 174         return 0;
 175 }
 176
 177 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 178                              struct a2mp_cmd *hdr)
 179 {
 180         struct a2mp_discov_rsp *rsp = (void *) skb->data;
 181         u16 len = le16_to_cpu(hdr->len);
 182         struct a2mp_cl *cl;
 183         u16 ext_feat;
 184         bool found = false;
 185
 186         if (len < sizeof(*rsp))
 187                 return -EINVAL;
 188
 189         len -= sizeof(*rsp);
 190         skb_pull(skb, sizeof(*rsp));
 191
 192         ext_feat = le16_to_cpu(rsp->ext_feat);
 193
 194         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
 195
 196         /* check that packet is not broken for now */
 197         while (ext_feat & A2MP_FEAT_EXT) {
 198                 if (len < sizeof(ext_feat))
 199                         return -EINVAL;
 200
 201                 ext_feat = get_unaligned_le16(skb->data);
 202                 BT_DBG("efm 0x%4.4x", ext_feat);
 203                 len -= sizeof(ext_feat);
 204                 skb_pull(skb, sizeof(ext_feat));
 205         }
 206
 207         cl = (void *) skb->data;
 208         while (len >= sizeof(*cl)) {
 209                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
 210                        cl->status);
 211
 212                 if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) {
 213                         struct a2mp_info_req req;
 214
 215                         found = true;
 216                         req.id = cl->id;
 217                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 218                                   sizeof(req), &req);
 219                 }
 220
 221                 len -= sizeof(*cl);
 222                 cl = (void *) skb_pull(skb, sizeof(*cl));
 223         }
 224
 225         /* Fall back to L2CAP init sequence */
 226         if (!found) {
 227                 struct l2cap_conn *conn = mgr->l2cap_conn;
 228                 struct l2cap_chan *chan;
 229
 230                 mutex_lock(&conn->chan_lock);
 231
 232                 list_for_each_entry(chan, &conn->chan_l, list) {
 233
 234                         BT_DBG("chan %p state %s", chan,
 235                                state_to_string(chan->state));
 236
 237                         if (chan->scid == L2CAP_CID_A2MP)
 238                                 continue;
 239
 240                         l2cap_chan_lock(chan);
 241
 242                         if (chan->state == BT_CONNECT)
 243                                 l2cap_send_conn_req(chan);
 244
 245                         l2cap_chan_unlock(chan);
 246                 }
 247
 248                 mutex_unlock(&conn->chan_lock);
 249         }
 250
 251         return 0;
 252 }
 253
 254 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 255                               struct a2mp_cmd *hdr)
 256 {
 257         struct a2mp_cl *cl = (void *) skb->data;
 258
 259         while (skb->len >= sizeof(*cl)) {
 260                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 261                        cl->status);
 262                 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
 263         }
 264
 265         /* TODO send A2MP_CHANGE_RSP */
 266
 267         return 0;
 268 }
 269
 270 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 271                             struct a2mp_cmd *hdr)
 272 {
 273         struct a2mp_info_req *req  = (void *) skb->data;
 274         struct hci_dev *hdev;
 275
 276         if (le16_to_cpu(hdr->len) < sizeof(*req))
 277                 return -EINVAL;
 278
 279         BT_DBG("id %d", req->id);
 280
 281         hdev = hci_dev_get(req->id);
 282         if (!hdev || hdev->dev_type != HCI_AMP) {
 283                 struct a2mp_info_rsp rsp;
 284
 285                 rsp.id = req->id;
 286                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 287
 288                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 289                           &rsp);
 290
 291                 goto done;
 292         }
 293
 294         set_bit(READ_LOC_AMP_INFO, &mgr->state);
 295         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 296
 297 done:
 298         if (hdev)
 299                 hci_dev_put(hdev);
 300
 301         skb_pull(skb, sizeof(*req));
 302         return 0;
 303 }
 304
 305 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 306                             struct a2mp_cmd *hdr)
 307 {
 308         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
 309         struct a2mp_amp_assoc_req req;
 310         struct amp_ctrl *ctrl;
 311
 312         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
 313                 return -EINVAL;
 314
 315         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
 316
 317         if (rsp->status)
 318                 return -EINVAL;
 319
 320         ctrl = amp_ctrl_add(mgr, rsp->id);
 321         if (!ctrl)
 322                 return -ENOMEM;
 323
 324         req.id = rsp->id;
 325         a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
 326                   &req);
 327
 328         skb_pull(skb, sizeof(*rsp));
 329         return 0;
 330 }
 331
 332 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
 333                                 struct a2mp_cmd *hdr)
 334 {
 335         struct a2mp_amp_assoc_req *req = (void *) skb->data;
 336         struct hci_dev *hdev;
 337         struct amp_mgr *tmp;
 338
 339         if (le16_to_cpu(hdr->len) < sizeof(*req))
 340                 return -EINVAL;
 341
 342         BT_DBG("id %d", req->id);
 343
 344         /* Make sure that other request is not processed */
 345         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 346
 347         hdev = hci_dev_get(req->id);
 348         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) {
 349                 struct a2mp_amp_assoc_rsp rsp;
 350                 rsp.id = req->id;
 351
 352                 if (tmp) {
 353                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 354                         amp_mgr_put(tmp);
 355                 } else {
 356                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 357                 }
 358
 359                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 360                           &rsp);
 361
 362                 goto done;
 363         }
 364
 365         amp_read_loc_assoc(hdev, mgr);
 366
 367 done:
 368         if (hdev)
 369                 hci_dev_put(hdev);
 370
 371         skb_pull(skb, sizeof(*req));
 372         return 0;
 373 }
 374
 375 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 376                                 struct a2mp_cmd *hdr)
 377 {
 378         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
 379         u16 len = le16_to_cpu(hdr->len);
 380         struct hci_dev *hdev;
 381         struct amp_ctrl *ctrl;
 382         struct hci_conn *hcon;
 383         size_t assoc_len;
 384
 385         if (len < sizeof(*rsp))
 386                 return -EINVAL;
 387
 388         assoc_len = len - sizeof(*rsp);
 389
 390         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
 391                assoc_len);
 392
 393         if (rsp->status)
 394                 return -EINVAL;
 395
 396         /* Save remote ASSOC data */
 397         ctrl = amp_ctrl_lookup(mgr, rsp->id);
 398         if (ctrl) {
 399                 u8 *assoc;
 400
 401                 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
 402                 if (!assoc) {
 403                         amp_ctrl_put(ctrl);
 404                         return -ENOMEM;
 405                 }
 406
 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 == AMP_TYPE_BREDR) {
 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 = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
 476                 if (!assoc) {
 477                         amp_ctrl_put(ctrl);
 478                         return -ENOMEM;
 479                 }
 480
 481                 ctrl->assoc = assoc;
 482                 ctrl->assoc_len = assoc_len;
 483                 ctrl->assoc_rem_len = assoc_len;
 484                 ctrl->assoc_len_so_far = 0;
 485
 486                 amp_ctrl_put(ctrl);
 487         }
 488
 489         hcon = phylink_add(hdev, mgr, req->local_id, false);
 490         if (hcon) {
 491                 amp_accept_phylink(hdev, mgr, hcon);
 492                 rsp.status = A2MP_STATUS_SUCCESS;
 493         } else {
 494                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 495         }
 496
 497 send_rsp:
 498         if (hdev)
 499                 hci_dev_put(hdev);
 500
 501         /* Reply error now and success after HCI Write Remote AMP Assoc
 502            command complete with success status
 503          */
 504         if (rsp.status != A2MP_STATUS_SUCCESS) {
 505                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 506                           sizeof(rsp), &rsp);
 507         } else {
 508                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 509                 mgr->ident = hdr->ident;
 510         }
 511
 512         skb_pull(skb, le16_to_cpu(hdr->len));
 513         return 0;
 514 }
 515
 516 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 517                                  struct a2mp_cmd *hdr)
 518 {
 519         struct a2mp_physlink_req *req = (void *) skb->data;
 520         struct a2mp_physlink_rsp rsp;
 521         struct hci_dev *hdev;
 522         struct hci_conn *hcon;
 523
 524         if (le16_to_cpu(hdr->len) < sizeof(*req))
 525                 return -EINVAL;
 526
 527         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 528
 529         rsp.local_id = req->remote_id;
 530         rsp.remote_id = req->local_id;
 531         rsp.status = A2MP_STATUS_SUCCESS;
 532
 533         hdev = hci_dev_get(req->remote_id);
 534         if (!hdev) {
 535                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 536                 goto send_rsp;
 537         }
 538
 539         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
 540                                        &mgr->l2cap_conn->hcon->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 = 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                                       int err)
 676 {
 677         struct amp_mgr *mgr = chan->data;
 678
 679         if (!mgr)
 680                 return;
 681
 682         BT_DBG("chan %p state %s", chan, state_to_string(state));
 683
 684         chan->state = state;
 685
 686         switch (state) {
 687         case BT_CLOSED:
 688                 if (mgr)
 689                         amp_mgr_put(mgr);
 690                 break;
 691         }
 692 }
 693
 694 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 695                                               unsigned long hdr_len,
 696                                               unsigned long len, int nb)
 697 {
 698         struct sk_buff *skb;
 699
 700         skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
 701         if (!skb)
 702                 return ERR_PTR(-ENOMEM);
 703
 704         return skb;
 705 }
 706
 707 static const struct l2cap_ops a2mp_chan_ops = {
 708         .name = "L2CAP A2MP channel",
 709         .recv = a2mp_chan_recv_cb,
 710         .close = a2mp_chan_close_cb,
 711         .state_change = a2mp_chan_state_change_cb,
 712         .alloc_skb = a2mp_chan_alloc_skb_cb,
 713
 714         /* Not implemented for A2MP */
 715         .new_connection = l2cap_chan_no_new_connection,
 716         .teardown = l2cap_chan_no_teardown,
 717         .ready = l2cap_chan_no_ready,
 718         .defer = l2cap_chan_no_defer,
 719         .resume = l2cap_chan_no_resume,
 720         .set_shutdown = l2cap_chan_no_set_shutdown,
 721         .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
 722 };
 723
 724 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 725 {
 726         struct l2cap_chan *chan;
 727         int err;
 728
 729         chan = l2cap_chan_create();
 730         if (!chan)
 731                 return NULL;
 732
 733         BT_DBG("chan %p", chan);
 734
 735         chan->chan_type = L2CAP_CHAN_FIXED;
 736         chan->scid = L2CAP_CID_A2MP;
 737         chan->dcid = L2CAP_CID_A2MP;
 738         chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
 739         chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
 740         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 741
 742         chan->ops = &a2mp_chan_ops;
 743
 744         l2cap_chan_set_defaults(chan);
 745         chan->remote_max_tx = chan->max_tx;
 746         chan->remote_tx_win = chan->tx_win;
 747
 748         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 749         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 750
 751         skb_queue_head_init(&chan->tx_q);
 752
 753         chan->mode = L2CAP_MODE_ERTM;
 754
 755         err = l2cap_ertm_init(chan);
 756         if (err < 0) {
 757                 l2cap_chan_del(chan, 0);
 758                 return NULL;
 759         }
 760
 761         chan->conf_state = 0;
 762
 763         if (locked)
 764                 __l2cap_chan_add(conn, chan);
 765         else
 766                 l2cap_chan_add(conn, chan);
 767
 768         chan->remote_mps = chan->omtu;
 769         chan->mps = chan->omtu;
 770
 771         chan->state = BT_CONNECTED;
 772
 773         return chan;
 774 }
 775
 776 /* AMP Manager functions */
 777 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 778 {
 779         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 780
 781         kref_get(&mgr->kref);
 782
 783         return mgr;
 784 }
 785
 786 static void amp_mgr_destroy(struct kref *kref)
 787 {
 788         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 789
 790         BT_DBG("mgr %p", mgr);
 791
 792         mutex_lock(&amp_mgr_list_lock);
 793         list_del(&mgr->list);
 794         mutex_unlock(&amp_mgr_list_lock);
 795
 796         amp_ctrl_list_flush(mgr);
 797         kfree(mgr);
 798 }
 799
 800 int amp_mgr_put(struct amp_mgr *mgr)
 801 {
 802         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 803
 804         return kref_put(&mgr->kref, &amp_mgr_destroy);
 805 }
 806
 807 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 808 {
 809         struct amp_mgr *mgr;
 810         struct l2cap_chan *chan;
 811
 812         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 813         if (!mgr)
 814                 return NULL;
 815
 816         BT_DBG("conn %p mgr %p", conn, mgr);
 817
 818         mgr->l2cap_conn = conn;
 819
 820         chan = a2mp_chan_open(conn, locked);
 821         if (!chan) {
 822                 kfree(mgr);
 823                 return NULL;
 824         }
 825
 826         mgr->a2mp_chan = chan;
 827         chan->data = mgr;
 828
 829         conn->hcon->amp_mgr = mgr;
 830
 831         kref_init(&mgr->kref);
 832
 833         /* Remote AMP ctrl list initialization */
 834         INIT_LIST_HEAD(&mgr->amp_ctrls);
 835         mutex_init(&mgr->amp_ctrls_lock);
 836
 837         mutex_lock(&amp_mgr_list_lock);
 838         list_add(&mgr->list, &amp_mgr_list);
 839         mutex_unlock(&amp_mgr_list_lock);
 840
 841         return mgr;
 842 }
 843
 844 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 845                                        struct sk_buff *skb)
 846 {
 847         struct amp_mgr *mgr;
 848
 849         if (conn->hcon->type != ACL_LINK)
 850                 return NULL;
 851
 852         mgr = amp_mgr_create(conn, false);
 853         if (!mgr) {
 854                 BT_ERR("Could not create AMP manager");
 855                 return NULL;
 856         }
 857
 858         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 859
 860         return mgr->a2mp_chan;
 861 }
 862
 863 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
 864 {
 865         struct amp_mgr *mgr;
 866
 867         mutex_lock(&amp_mgr_list_lock);
 868         list_for_each_entry(mgr, &amp_mgr_list, list) {
 869                 if (test_and_clear_bit(state, &mgr->state)) {
 870                         amp_mgr_get(mgr);
 871                         mutex_unlock(&amp_mgr_list_lock);
 872                         return mgr;
 873                 }
 874         }
 875         mutex_unlock(&amp_mgr_list_lock);
 876
 877         return NULL;
 878 }
 879
 880 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 881 {
 882         struct amp_mgr *mgr;
 883         struct a2mp_info_rsp rsp;
 884
 885         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 886         if (!mgr)
 887                 return;
 888
 889         BT_DBG("%s mgr %p", hdev->name, mgr);
 890
 891         rsp.id = hdev->id;
 892         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 893
 894         if (hdev->amp_type != AMP_TYPE_BREDR) {
 895                 rsp.status = 0;
 896                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 897                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 898                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 899                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 900                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 901         }
 902
 903         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 904         amp_mgr_put(mgr);
 905 }
 906
 907 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 908 {
 909         struct amp_mgr *mgr;
 910         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 911         struct a2mp_amp_assoc_rsp *rsp;
 912         size_t len;
 913
 914         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 915         if (!mgr)
 916                 return;
 917
 918         BT_DBG("%s mgr %p", hdev->name, mgr);
 919
 920         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 921         rsp = kzalloc(len, GFP_KERNEL);
 922         if (!rsp) {
 923                 amp_mgr_put(mgr);
 924                 return;
 925         }
 926
 927         rsp->id = hdev->id;
 928
 929         if (status) {
 930                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 931         } else {
 932                 rsp->status = A2MP_STATUS_SUCCESS;
 933                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 934         }
 935
 936         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 937         amp_mgr_put(mgr);
 938         kfree(rsp);
 939 }
 940
 941 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 942 {
 943         struct amp_mgr *mgr;
 944         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 945         struct a2mp_physlink_req *req;
 946         struct l2cap_chan *bredr_chan;
 947         size_t len;
 948
 949         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 950         if (!mgr)
 951                 return;
 952
 953         len = sizeof(*req) + loc_assoc->len;
 954
 955         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 956
 957         req = kzalloc(len, GFP_KERNEL);
 958         if (!req) {
 959                 amp_mgr_put(mgr);
 960                 return;
 961         }
 962
 963         bredr_chan = mgr->bredr_chan;
 964         if (!bredr_chan)
 965                 goto clean;
 966
 967         req->local_id = hdev->id;
 968         req->remote_id = bredr_chan->remote_amp_id;
 969         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
 970
 971         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
 972
 973 clean:
 974         amp_mgr_put(mgr);
 975         kfree(req);
 976 }
 977
 978 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
 979 {
 980         struct amp_mgr *mgr;
 981         struct a2mp_physlink_rsp rsp;
 982         struct hci_conn *hs_hcon;
 983
 984         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
 985         if (!mgr)
 986                 return;
 987
 988         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
 989         if (!hs_hcon) {
 990                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 991         } else {
 992                 rsp.remote_id = hs_hcon->remote_id;
 993                 rsp.status = A2MP_STATUS_SUCCESS;
 994         }
 995
 996         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
 997                status);
 998
 999         rsp.local_id = hdev->id;
1000         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
1001         amp_mgr_put(mgr);
1002 }
1003
1004 void a2mp_discover_amp(struct l2cap_chan *chan)
1005 {
1006         struct l2cap_conn *conn = chan->conn;
1007         struct amp_mgr *mgr = conn->hcon->amp_mgr;
1008         struct a2mp_discov_req req;
1009
1010         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
1011
1012         if (!mgr) {
1013                 mgr = amp_mgr_create(conn, true);
1014                 if (!mgr)
1015                         return;
1016         }
1017
1018         mgr->bredr_chan = chan;
1019
1020         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1021         req.ext_feat = 0;
1022         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1023 }