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