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 "hci_request.h"
  20 #include "a2mp.h"
  21 #include "amp.h"
  22
  23 #define A2MP_FEAT_EXT   0x8000
  24
  25 /* Global AMP Manager list */
  26 static LIST_HEAD(amp_mgr_list);
  27 static DEFINE_MUTEX(amp_mgr_list_lock);
  28
  29 /* A2MP build & send command helper functions */
  30 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
  31 {
  32         struct a2mp_cmd *cmd;
  33         int plen;
  34
  35         plen = sizeof(*cmd) + len;
  36         cmd = kzalloc(plen, GFP_KERNEL);
  37         if (!cmd)
  38                 return NULL;
  39
  40         cmd->code = code;
  41         cmd->ident = ident;
  42         cmd->len = cpu_to_le16(len);
  43
  44         memcpy(cmd->data, data, len);
  45
  46         return cmd;
  47 }
  48
  49 static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
  50 {
  51         struct l2cap_chan *chan = mgr->a2mp_chan;
  52         struct a2mp_cmd *cmd;
  53         u16 total_len = len + sizeof(*cmd);
  54         struct kvec iv;
  55         struct msghdr msg;
  56
  57         cmd = __a2mp_build(code, ident, len, data);
  58         if (!cmd)
  59                 return;
  60
  61         iv.iov_base = cmd;
  62         iv.iov_len = total_len;
  63
  64         memset(&msg, 0, sizeof(msg));
  65
  66         iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iv, 1, total_len);
  67
  68         l2cap_chan_send(chan, &msg, total_len);
  69
  70         kfree(cmd);
  71 }
  72
  73 static u8 __next_ident(struct amp_mgr *mgr)
  74 {
  75         if (++mgr->ident == 0)
  76                 mgr->ident = 1;
  77
  78         return mgr->ident;
  79 }
  80
  81 static struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
  82 {
  83         struct amp_mgr *mgr;
  84
  85         mutex_lock(&amp_mgr_list_lock);
  86         list_for_each_entry(mgr, &amp_mgr_list, list) {
  87                 if (test_and_clear_bit(state, &mgr->state)) {
  88                         amp_mgr_get(mgr);
  89                         mutex_unlock(&amp_mgr_list_lock);
  90                         return mgr;
  91                 }
  92         }
  93         mutex_unlock(&amp_mgr_list_lock);
  94
  95         return NULL;
  96 }
  97
  98 /* hci_dev_list shall be locked */
  99 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl)
 100 {
 101         struct hci_dev *hdev;
 102         int i = 1;
 103
 104         cl[0].id = AMP_ID_BREDR;
 105         cl[0].type = AMP_TYPE_BREDR;
 106         cl[0].status = AMP_STATUS_BLUETOOTH_ONLY;
 107
 108         list_for_each_entry(hdev, &hci_dev_list, list) {
 109                 if (hdev->dev_type == HCI_AMP) {
 110                         cl[i].id = hdev->id;
 111                         cl[i].type = hdev->amp_type;
 112                         if (test_bit(HCI_UP, &hdev->flags))
 113                                 cl[i].status = hdev->amp_status;
 114                         else
 115                                 cl[i].status = AMP_STATUS_POWERED_DOWN;
 116                         i++;
 117                 }
 118         }
 119 }
 120
 121 /* Processing A2MP messages */
 122 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
 123                             struct a2mp_cmd *hdr)
 124 {
 125         struct a2mp_cmd_rej *rej = (void *) skb->data;
 126
 127         if (le16_to_cpu(hdr->len) < sizeof(*rej))
 128                 return -EINVAL;
 129
 130         BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
 131
 132         skb_pull(skb, sizeof(*rej));
 133
 134         return 0;
 135 }
 136
 137 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
 138                              struct a2mp_cmd *hdr)
 139 {
 140         struct a2mp_discov_req *req = (void *) skb->data;
 141         u16 len = le16_to_cpu(hdr->len);
 142         struct a2mp_discov_rsp *rsp;
 143         u16 ext_feat;
 144         u8 num_ctrl;
 145         struct hci_dev *hdev;
 146
 147         if (len < sizeof(*req))
 148                 return -EINVAL;
 149
 150         skb_pull(skb, sizeof(*req));
 151
 152         ext_feat = le16_to_cpu(req->ext_feat);
 153
 154         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
 155
 156         /* check that packet is not broken for now */
 157         while (ext_feat & A2MP_FEAT_EXT) {
 158                 if (len < sizeof(ext_feat))
 159                         return -EINVAL;
 160
 161                 ext_feat = get_unaligned_le16(skb->data);
 162                 BT_DBG("efm 0x%4.4x", ext_feat);
 163                 len -= sizeof(ext_feat);
 164                 skb_pull(skb, sizeof(ext_feat));
 165         }
 166
 167         read_lock(&hci_dev_list_lock);
 168
 169         /* at minimum the BR/EDR needs to be listed */
 170         num_ctrl = 1;
 171
 172         list_for_each_entry(hdev, &hci_dev_list, list) {
 173                 if (hdev->dev_type == HCI_AMP)
 174                         num_ctrl++;
 175         }
 176
 177         len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
 178         rsp = kmalloc(len, GFP_ATOMIC);
 179         if (!rsp) {
 180                 read_unlock(&hci_dev_list_lock);
 181                 return -ENOMEM;
 182         }
 183
 184         rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
 185         rsp->ext_feat = 0;
 186
 187         __a2mp_add_cl(mgr, rsp->cl);
 188
 189         read_unlock(&hci_dev_list_lock);
 190
 191         a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
 192
 193         kfree(rsp);
 194         return 0;
 195 }
 196
 197 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 198                              struct a2mp_cmd *hdr)
 199 {
 200         struct a2mp_discov_rsp *rsp = (void *) skb->data;
 201         u16 len = le16_to_cpu(hdr->len);
 202         struct a2mp_cl *cl;
 203         u16 ext_feat;
 204         bool found = false;
 205
 206         if (len < sizeof(*rsp))
 207                 return -EINVAL;
 208
 209         len -= sizeof(*rsp);
 210         skb_pull(skb, sizeof(*rsp));
 211
 212         ext_feat = le16_to_cpu(rsp->ext_feat);
 213
 214         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
 215
 216         /* check that packet is not broken for now */
 217         while (ext_feat & A2MP_FEAT_EXT) {
 218                 if (len < sizeof(ext_feat))
 219                         return -EINVAL;
 220
 221                 ext_feat = get_unaligned_le16(skb->data);
 222                 BT_DBG("efm 0x%4.4x", ext_feat);
 223                 len -= sizeof(ext_feat);
 224                 skb_pull(skb, sizeof(ext_feat));
 225         }
 226
 227         cl = (void *) skb->data;
 228         while (len >= sizeof(*cl)) {
 229                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
 230                        cl->status);
 231
 232                 if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) {
 233                         struct a2mp_info_req req;
 234
 235                         found = true;
 236
 237                         memset(&req, 0, sizeof(req));
 238
 239                         req.id = cl->id;
 240                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 241                                   sizeof(req), &req);
 242                 }
 243
 244                 len -= sizeof(*cl);
 245                 cl = skb_pull(skb, sizeof(*cl));
 246         }
 247
 248         /* Fall back to L2CAP init sequence */
 249         if (!found) {
 250                 struct l2cap_conn *conn = mgr->l2cap_conn;
 251                 struct l2cap_chan *chan;
 252
 253                 mutex_lock(&conn->chan_lock);
 254
 255                 list_for_each_entry(chan, &conn->chan_l, list) {
 256
 257                         BT_DBG("chan %p state %s", chan,
 258                                state_to_string(chan->state));
 259
 260                         if (chan->scid == L2CAP_CID_A2MP)
 261                                 continue;
 262
 263                         l2cap_chan_lock(chan);
 264
 265                         if (chan->state == BT_CONNECT)
 266                                 l2cap_send_conn_req(chan);
 267
 268                         l2cap_chan_unlock(chan);
 269                 }
 270
 271                 mutex_unlock(&conn->chan_lock);
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 278                               struct a2mp_cmd *hdr)
 279 {
 280         struct a2mp_cl *cl = (void *) skb->data;
 281
 282         while (skb->len >= sizeof(*cl)) {
 283                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 284                        cl->status);
 285                 cl = skb_pull(skb, sizeof(*cl));
 286         }
 287
 288         /* TODO send A2MP_CHANGE_RSP */
 289
 290         return 0;
 291 }
 292
 293 static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status,
 294                                          u16 opcode)
 295 {
 296         BT_DBG("%s status 0x%2.2x", hdev->name, status);
 297
 298         a2mp_send_getinfo_rsp(hdev);
 299 }
 300
 301 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 302                             struct a2mp_cmd *hdr)
 303 {
 304         struct a2mp_info_req *req  = (void *) skb->data;
 305         struct hci_dev *hdev;
 306         struct hci_request hreq;
 307         int err = 0;
 308
 309         if (le16_to_cpu(hdr->len) < sizeof(*req))
 310                 return -EINVAL;
 311
 312         BT_DBG("id %d", req->id);
 313
 314         hdev = hci_dev_get(req->id);
 315         if (!hdev || hdev->dev_type != HCI_AMP) {
 316                 struct a2mp_info_rsp rsp;
 317
 318                 memset(&rsp, 0, sizeof(rsp));
 319
 320                 rsp.id = req->id;
 321                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 322
 323                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 324                           &rsp);
 325
 326                 goto done;
 327         }
 328
 329         set_bit(READ_LOC_AMP_INFO, &mgr->state);
 330         hci_req_init(&hreq, hdev);
 331         hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 332         err = hci_req_run(&hreq, read_local_amp_info_complete);
 333         if (err < 0)
 334                 a2mp_send_getinfo_rsp(hdev);
 335
 336 done:
 337         if (hdev)
 338                 hci_dev_put(hdev);
 339
 340         skb_pull(skb, sizeof(*req));
 341         return 0;
 342 }
 343
 344 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 345                             struct a2mp_cmd *hdr)
 346 {
 347         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
 348         struct a2mp_amp_assoc_req req;
 349         struct amp_ctrl *ctrl;
 350
 351         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
 352                 return -EINVAL;
 353
 354         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
 355
 356         if (rsp->status)
 357                 return -EINVAL;
 358
 359         ctrl = amp_ctrl_add(mgr, rsp->id);
 360         if (!ctrl)
 361                 return -ENOMEM;
 362
 363         memset(&req, 0, sizeof(req));
 364
 365         req.id = rsp->id;
 366         a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
 367                   &req);
 368
 369         skb_pull(skb, sizeof(*rsp));
 370         return 0;
 371 }
 372
 373 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
 374                                 struct a2mp_cmd *hdr)
 375 {
 376         struct a2mp_amp_assoc_req *req = (void *) skb->data;
 377         struct hci_dev *hdev;
 378         struct amp_mgr *tmp;
 379
 380         if (le16_to_cpu(hdr->len) < sizeof(*req))
 381                 return -EINVAL;
 382
 383         BT_DBG("id %d", req->id);
 384
 385         /* Make sure that other request is not processed */
 386         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 387
 388         hdev = hci_dev_get(req->id);
 389         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) {
 390                 struct a2mp_amp_assoc_rsp rsp;
 391                 rsp.id = req->id;
 392
 393                 memset(&rsp, 0, sizeof(rsp));
 394
 395                 if (tmp) {
 396                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 397                         amp_mgr_put(tmp);
 398                 } else {
 399                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 400                 }
 401
 402                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 403                           &rsp);
 404
 405                 goto done;
 406         }
 407
 408         amp_read_loc_assoc(hdev, mgr);
 409
 410 done:
 411         if (hdev)
 412                 hci_dev_put(hdev);
 413
 414         skb_pull(skb, sizeof(*req));
 415         return 0;
 416 }
 417
 418 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 419                                 struct a2mp_cmd *hdr)
 420 {
 421         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
 422         u16 len = le16_to_cpu(hdr->len);
 423         struct hci_dev *hdev;
 424         struct amp_ctrl *ctrl;
 425         struct hci_conn *hcon;
 426         size_t assoc_len;
 427
 428         if (len < sizeof(*rsp))
 429                 return -EINVAL;
 430
 431         assoc_len = len - sizeof(*rsp);
 432
 433         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
 434                assoc_len);
 435
 436         if (rsp->status)
 437                 return -EINVAL;
 438
 439         /* Save remote ASSOC data */
 440         ctrl = amp_ctrl_lookup(mgr, rsp->id);
 441         if (ctrl) {
 442                 u8 *assoc;
 443
 444                 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
 445                 if (!assoc) {
 446                         amp_ctrl_put(ctrl);
 447                         return -ENOMEM;
 448                 }
 449
 450                 ctrl->assoc = assoc;
 451                 ctrl->assoc_len = assoc_len;
 452                 ctrl->assoc_rem_len = assoc_len;
 453                 ctrl->assoc_len_so_far = 0;
 454
 455                 amp_ctrl_put(ctrl);
 456         }
 457
 458         /* Create Phys Link */
 459         hdev = hci_dev_get(rsp->id);
 460         if (!hdev)
 461                 return -EINVAL;
 462
 463         hcon = phylink_add(hdev, mgr, rsp->id, true);
 464         if (!hcon)
 465                 goto done;
 466
 467         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
 468
 469         mgr->bredr_chan->remote_amp_id = rsp->id;
 470
 471         amp_create_phylink(hdev, mgr, hcon);
 472
 473 done:
 474         hci_dev_put(hdev);
 475         skb_pull(skb, len);
 476         return 0;
 477 }
 478
 479 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 480                                    struct a2mp_cmd *hdr)
 481 {
 482         struct a2mp_physlink_req *req = (void *) skb->data;
 483         struct a2mp_physlink_rsp rsp;
 484         struct hci_dev *hdev;
 485         struct hci_conn *hcon;
 486         struct amp_ctrl *ctrl;
 487
 488         if (le16_to_cpu(hdr->len) < sizeof(*req))
 489                 return -EINVAL;
 490
 491         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 492
 493         memset(&rsp, 0, sizeof(rsp));
 494
 495         rsp.local_id = req->remote_id;
 496         rsp.remote_id = req->local_id;
 497
 498         hdev = hci_dev_get(req->remote_id);
 499         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) {
 500                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 501                 goto send_rsp;
 502         }
 503
 504         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
 505         if (!ctrl) {
 506                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
 507                 if (ctrl) {
 508                         amp_ctrl_get(ctrl);
 509                 } else {
 510                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 511                         goto send_rsp;
 512                 }
 513         }
 514
 515         if (ctrl) {
 516                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
 517                 u8 *assoc;
 518
 519                 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
 520                 if (!assoc) {
 521                         amp_ctrl_put(ctrl);
 522                         return -ENOMEM;
 523                 }
 524
 525                 ctrl->assoc = assoc;
 526                 ctrl->assoc_len = assoc_len;
 527                 ctrl->assoc_rem_len = assoc_len;
 528                 ctrl->assoc_len_so_far = 0;
 529
 530                 amp_ctrl_put(ctrl);
 531         }
 532
 533         hcon = phylink_add(hdev, mgr, req->local_id, false);
 534         if (hcon) {
 535                 amp_accept_phylink(hdev, mgr, hcon);
 536                 rsp.status = A2MP_STATUS_SUCCESS;
 537         } else {
 538                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 539         }
 540
 541 send_rsp:
 542         if (hdev)
 543                 hci_dev_put(hdev);
 544
 545         /* Reply error now and success after HCI Write Remote AMP Assoc
 546            command complete with success status
 547          */
 548         if (rsp.status != A2MP_STATUS_SUCCESS) {
 549                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 550                           sizeof(rsp), &rsp);
 551         } else {
 552                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 553                 mgr->ident = hdr->ident;
 554         }
 555
 556         skb_pull(skb, le16_to_cpu(hdr->len));
 557         return 0;
 558 }
 559
 560 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 561                                  struct a2mp_cmd *hdr)
 562 {
 563         struct a2mp_physlink_req *req = (void *) skb->data;
 564         struct a2mp_physlink_rsp rsp;
 565         struct hci_dev *hdev;
 566         struct hci_conn *hcon;
 567
 568         if (le16_to_cpu(hdr->len) < sizeof(*req))
 569                 return -EINVAL;
 570
 571         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 572
 573         memset(&rsp, 0, sizeof(rsp));
 574
 575         rsp.local_id = req->remote_id;
 576         rsp.remote_id = req->local_id;
 577         rsp.status = A2MP_STATUS_SUCCESS;
 578
 579         hdev = hci_dev_get(req->remote_id);
 580         if (!hdev) {
 581                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 582                 goto send_rsp;
 583         }
 584
 585         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
 586                                        &mgr->l2cap_conn->hcon->dst);
 587         if (!hcon) {
 588                 bt_dev_err(hdev, "no phys link exist");
 589                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 590                 goto clean;
 591         }
 592
 593         /* TODO Disconnect Phys Link here */
 594
 595 clean:
 596         hci_dev_put(hdev);
 597
 598 send_rsp:
 599         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 600
 601         skb_pull(skb, sizeof(*req));
 602         return 0;
 603 }
 604
 605 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 606                                struct a2mp_cmd *hdr)
 607 {
 608         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 609
 610         skb_pull(skb, le16_to_cpu(hdr->len));
 611         return 0;
 612 }
 613
 614 /* Handle A2MP signalling */
 615 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 616 {
 617         struct a2mp_cmd *hdr;
 618         struct amp_mgr *mgr = chan->data;
 619         int err = 0;
 620
 621         amp_mgr_get(mgr);
 622
 623         while (skb->len >= sizeof(*hdr)) {
 624                 u16 len;
 625
 626                 hdr = (void *) skb->data;
 627                 len = le16_to_cpu(hdr->len);
 628
 629                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 630
 631                 skb_pull(skb, sizeof(*hdr));
 632
 633                 if (len > skb->len || !hdr->ident) {
 634                         err = -EINVAL;
 635                         break;
 636                 }
 637
 638                 mgr->ident = hdr->ident;
 639
 640                 switch (hdr->code) {
 641                 case A2MP_COMMAND_REJ:
 642                         a2mp_command_rej(mgr, skb, hdr);
 643                         break;
 644
 645                 case A2MP_DISCOVER_REQ:
 646                         err = a2mp_discover_req(mgr, skb, hdr);
 647                         break;
 648
 649                 case A2MP_CHANGE_NOTIFY:
 650                         err = a2mp_change_notify(mgr, skb, hdr);
 651                         break;
 652
 653                 case A2MP_GETINFO_REQ:
 654                         err = a2mp_getinfo_req(mgr, skb, hdr);
 655                         break;
 656
 657                 case A2MP_GETAMPASSOC_REQ:
 658                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 659                         break;
 660
 661                 case A2MP_CREATEPHYSLINK_REQ:
 662                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 663                         break;
 664
 665                 case A2MP_DISCONNPHYSLINK_REQ:
 666                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 667                         break;
 668
 669                 case A2MP_DISCOVER_RSP:
 670                         err = a2mp_discover_rsp(mgr, skb, hdr);
 671                         break;
 672
 673                 case A2MP_GETINFO_RSP:
 674                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
 675                         break;
 676
 677                 case A2MP_GETAMPASSOC_RSP:
 678                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
 679                         break;
 680
 681                 case A2MP_CHANGE_RSP:
 682                 case A2MP_CREATEPHYSLINK_RSP:
 683                 case A2MP_DISCONNPHYSLINK_RSP:
 684                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 685                         break;
 686
 687                 default:
 688                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 689                         err = -EINVAL;
 690                         break;
 691                 }
 692         }
 693
 694         if (err) {
 695                 struct a2mp_cmd_rej rej;
 696
 697                 memset(&rej, 0, sizeof(rej));
 698
 699                 rej.reason = cpu_to_le16(0);
 700                 hdr = (void *) skb->data;
 701
 702                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 703
 704                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 705                           &rej);
 706         }
 707
 708         /* Always free skb and return success error code to prevent
 709            from sending L2CAP Disconnect over A2MP channel */
 710         kfree_skb(skb);
 711
 712         amp_mgr_put(mgr);
 713
 714         return 0;
 715 }
 716
 717 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 718 {
 719         l2cap_chan_put(chan);
 720 }
 721
 722 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state,
 723                                       int err)
 724 {
 725         struct amp_mgr *mgr = chan->data;
 726
 727         if (!mgr)
 728                 return;
 729
 730         BT_DBG("chan %p state %s", chan, state_to_string(state));
 731
 732         chan->state = state;
 733
 734         switch (state) {
 735         case BT_CLOSED:
 736                 if (mgr)
 737                         amp_mgr_put(mgr);
 738                 break;
 739         }
 740 }
 741
 742 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 743                                               unsigned long hdr_len,
 744                                               unsigned long len, int nb)
 745 {
 746         struct sk_buff *skb;
 747
 748         skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
 749         if (!skb)
 750                 return ERR_PTR(-ENOMEM);
 751
 752         return skb;
 753 }
 754
 755 static const struct l2cap_ops a2mp_chan_ops = {
 756         .name = "L2CAP A2MP channel",
 757         .recv = a2mp_chan_recv_cb,
 758         .close = a2mp_chan_close_cb,
 759         .state_change = a2mp_chan_state_change_cb,
 760         .alloc_skb = a2mp_chan_alloc_skb_cb,
 761
 762         /* Not implemented for A2MP */
 763         .new_connection = l2cap_chan_no_new_connection,
 764         .teardown = l2cap_chan_no_teardown,
 765         .ready = l2cap_chan_no_ready,
 766         .defer = l2cap_chan_no_defer,
 767         .resume = l2cap_chan_no_resume,
 768         .set_shutdown = l2cap_chan_no_set_shutdown,
 769         .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
 770 };
 771
 772 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 773 {
 774         struct l2cap_chan *chan;
 775         int err;
 776
 777         chan = l2cap_chan_create();
 778         if (!chan)
 779                 return NULL;
 780
 781         BT_DBG("chan %p", chan);
 782
 783         chan->chan_type = L2CAP_CHAN_FIXED;
 784         chan->scid = L2CAP_CID_A2MP;
 785         chan->dcid = L2CAP_CID_A2MP;
 786         chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
 787         chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
 788         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 789
 790         chan->ops = &a2mp_chan_ops;
 791
 792         l2cap_chan_set_defaults(chan);
 793         chan->remote_max_tx = chan->max_tx;
 794         chan->remote_tx_win = chan->tx_win;
 795
 796         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 797         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 798
 799         skb_queue_head_init(&chan->tx_q);
 800
 801         chan->mode = L2CAP_MODE_ERTM;
 802
 803         err = l2cap_ertm_init(chan);
 804         if (err < 0) {
 805                 l2cap_chan_del(chan, 0);
 806                 return NULL;
 807         }
 808
 809         chan->conf_state = 0;
 810
 811         if (locked)
 812                 __l2cap_chan_add(conn, chan);
 813         else
 814                 l2cap_chan_add(conn, chan);
 815
 816         chan->remote_mps = chan->omtu;
 817         chan->mps = chan->omtu;
 818
 819         chan->state = BT_CONNECTED;
 820
 821         return chan;
 822 }
 823
 824 /* AMP Manager functions */
 825 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 826 {
 827         BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
 828
 829         kref_get(&mgr->kref);
 830
 831         return mgr;
 832 }
 833
 834 static void amp_mgr_destroy(struct kref *kref)
 835 {
 836         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 837
 838         BT_DBG("mgr %p", mgr);
 839
 840         mutex_lock(&amp_mgr_list_lock);
 841         list_del(&mgr->list);
 842         mutex_unlock(&amp_mgr_list_lock);
 843
 844         amp_ctrl_list_flush(mgr);
 845         kfree(mgr);
 846 }
 847
 848 int amp_mgr_put(struct amp_mgr *mgr)
 849 {
 850         BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
 851
 852         return kref_put(&mgr->kref, &amp_mgr_destroy);
 853 }
 854
 855 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 856 {
 857         struct amp_mgr *mgr;
 858         struct l2cap_chan *chan;
 859
 860         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 861         if (!mgr)
 862                 return NULL;
 863
 864         BT_DBG("conn %p mgr %p", conn, mgr);
 865
 866         mgr->l2cap_conn = conn;
 867
 868         chan = a2mp_chan_open(conn, locked);
 869         if (!chan) {
 870                 kfree(mgr);
 871                 return NULL;
 872         }
 873
 874         mgr->a2mp_chan = chan;
 875         chan->data = mgr;
 876
 877         conn->hcon->amp_mgr = mgr;
 878
 879         kref_init(&mgr->kref);
 880
 881         /* Remote AMP ctrl list initialization */
 882         INIT_LIST_HEAD(&mgr->amp_ctrls);
 883         mutex_init(&mgr->amp_ctrls_lock);
 884
 885         mutex_lock(&amp_mgr_list_lock);
 886         list_add(&mgr->list, &amp_mgr_list);
 887         mutex_unlock(&amp_mgr_list_lock);
 888
 889         return mgr;
 890 }
 891
 892 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 893                                        struct sk_buff *skb)
 894 {
 895         struct amp_mgr *mgr;
 896
 897         if (conn->hcon->type != ACL_LINK)
 898                 return NULL;
 899
 900         mgr = amp_mgr_create(conn, false);
 901         if (!mgr) {
 902                 BT_ERR("Could not create AMP manager");
 903                 return NULL;
 904         }
 905
 906         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 907
 908         return mgr->a2mp_chan;
 909 }
 910
 911 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 912 {
 913         struct amp_mgr *mgr;
 914         struct a2mp_info_rsp rsp;
 915
 916         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 917         if (!mgr)
 918                 return;
 919
 920         BT_DBG("%s mgr %p", hdev->name, mgr);
 921
 922         memset(&rsp, 0, sizeof(rsp));
 923
 924         rsp.id = hdev->id;
 925         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 926
 927         if (hdev->amp_type != AMP_TYPE_BREDR) {
 928                 rsp.status = 0;
 929                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 930                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 931                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 932                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 933                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 934         }
 935
 936         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 937         amp_mgr_put(mgr);
 938 }
 939
 940 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 941 {
 942         struct amp_mgr *mgr;
 943         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 944         struct a2mp_amp_assoc_rsp *rsp;
 945         size_t len;
 946
 947         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 948         if (!mgr)
 949                 return;
 950
 951         BT_DBG("%s mgr %p", hdev->name, mgr);
 952
 953         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 954         rsp = kzalloc(len, GFP_KERNEL);
 955         if (!rsp) {
 956                 amp_mgr_put(mgr);
 957                 return;
 958         }
 959
 960         rsp->id = hdev->id;
 961
 962         if (status) {
 963                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 964         } else {
 965                 rsp->status = A2MP_STATUS_SUCCESS;
 966                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 967         }
 968
 969         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 970         amp_mgr_put(mgr);
 971         kfree(rsp);
 972 }
 973
 974 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 975 {
 976         struct amp_mgr *mgr;
 977         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 978         struct a2mp_physlink_req *req;
 979         struct l2cap_chan *bredr_chan;
 980         size_t len;
 981
 982         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 983         if (!mgr)
 984                 return;
 985
 986         len = sizeof(*req) + loc_assoc->len;
 987
 988         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 989
 990         req = kzalloc(len, GFP_KERNEL);
 991         if (!req) {
 992                 amp_mgr_put(mgr);
 993                 return;
 994         }
 995
 996         bredr_chan = mgr->bredr_chan;
 997         if (!bredr_chan)
 998                 goto clean;
 999
1000         req->local_id = hdev->id;
1001         req->remote_id = bredr_chan->remote_amp_id;
1002         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
1003
1004         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
1005
1006 clean:
1007         amp_mgr_put(mgr);
1008         kfree(req);
1009 }
1010
1011 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
1012 {
1013         struct amp_mgr *mgr;
1014         struct a2mp_physlink_rsp rsp;
1015         struct hci_conn *hs_hcon;
1016
1017         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
1018         if (!mgr)
1019                 return;
1020
1021         memset(&rsp, 0, sizeof(rsp));
1022
1023         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
1024         if (!hs_hcon) {
1025                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
1026         } else {
1027                 rsp.remote_id = hs_hcon->remote_id;
1028                 rsp.status = A2MP_STATUS_SUCCESS;
1029         }
1030
1031         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
1032                status);
1033
1034         rsp.local_id = hdev->id;
1035         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
1036         amp_mgr_put(mgr);
1037 }
1038
1039 void a2mp_discover_amp(struct l2cap_chan *chan)
1040 {
1041         struct l2cap_conn *conn = chan->conn;
1042         struct amp_mgr *mgr = conn->hcon->amp_mgr;
1043         struct a2mp_discov_req req;
1044
1045         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
1046
1047         if (!mgr) {
1048                 mgr = amp_mgr_create(conn, true);
1049                 if (!mgr)
1050                         return;
1051         }
1052
1053         mgr->bredr_chan = chan;
1054
1055         memset(&req, 0, sizeof(req));
1056
1057         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1058         req.ext_feat = 0;
1059         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1060 }