net/bluetooth/a2mp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3    Copyright (c) 2010,2011 Code Aurora Forum.  All rights reserved.
   4    Copyright (c) 2011,2012 Intel Corp.
   5
   6 */
   7
   8 #include <net/bluetooth/bluetooth.h>
   9 #include <net/bluetooth/hci_core.h>
  10 #include <net/bluetooth/l2cap.h>
  11
  12 #include "hci_request.h"
  13 #include "a2mp.h"
  14 #include "amp.h"
  15
  16 #define A2MP_FEAT_EXT   0x8000
  17
  18 /* Global AMP Manager list */
  19 static LIST_HEAD(amp_mgr_list);
  20 static DEFINE_MUTEX(amp_mgr_list_lock);
  21
  22 /* A2MP build & send command helper functions */
  23 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
  24 {
  25         struct a2mp_cmd *cmd;
  26         int plen;
  27
  28         plen = sizeof(*cmd) + len;
  29         cmd = kzalloc(plen, GFP_KERNEL);
  30         if (!cmd)
  31                 return NULL;
  32
  33         cmd->code = code;
  34         cmd->ident = ident;
  35         cmd->len = cpu_to_le16(len);
  36
  37         memcpy(cmd->data, data, len);
  38
  39         return cmd;
  40 }
  41
  42 static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
  43 {
  44         struct l2cap_chan *chan = mgr->a2mp_chan;
  45         struct a2mp_cmd *cmd;
  46         u16 total_len = len + sizeof(*cmd);
  47         struct kvec iv;
  48         struct msghdr msg;
  49
  50         cmd = __a2mp_build(code, ident, len, data);
  51         if (!cmd)
  52                 return;
  53
  54         iv.iov_base = cmd;
  55         iv.iov_len = total_len;
  56
  57         memset(&msg, 0, sizeof(msg));
  58
  59         iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, total_len);
  60
  61         l2cap_chan_send(chan, &msg, total_len);
  62
  63         kfree(cmd);
  64 }
  65
  66 static u8 __next_ident(struct amp_mgr *mgr)
  67 {
  68         if (++mgr->ident == 0)
  69                 mgr->ident = 1;
  70
  71         return mgr->ident;
  72 }
  73
  74 static struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
  75 {
  76         struct amp_mgr *mgr;
  77
  78         mutex_lock(&amp_mgr_list_lock);
  79         list_for_each_entry(mgr, &amp_mgr_list, list) {
  80                 if (test_and_clear_bit(state, &mgr->state)) {
  81                         amp_mgr_get(mgr);
  82                         mutex_unlock(&amp_mgr_list_lock);
  83                         return mgr;
  84                 }
  85         }
  86         mutex_unlock(&amp_mgr_list_lock);
  87
  88         return NULL;
  89 }
  90
  91 /* hci_dev_list shall be locked */
  92 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl)
  93 {
  94         struct hci_dev *hdev;
  95         int i = 1;
  96
  97         cl[0].id = AMP_ID_BREDR;
  98         cl[0].type = AMP_TYPE_BREDR;
  99         cl[0].status = AMP_STATUS_BLUETOOTH_ONLY;
 100
 101         list_for_each_entry(hdev, &hci_dev_list, list) {
 102                 if (hdev->dev_type == HCI_AMP) {
 103                         cl[i].id = hdev->id;
 104                         cl[i].type = hdev->amp_type;
 105                         if (test_bit(HCI_UP, &hdev->flags))
 106                                 cl[i].status = hdev->amp_status;
 107                         else
 108                                 cl[i].status = AMP_STATUS_POWERED_DOWN;
 109                         i++;
 110                 }
 111         }
 112 }
 113
 114 /* Processing A2MP messages */
 115 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
 116                             struct a2mp_cmd *hdr)
 117 {
 118         struct a2mp_cmd_rej *rej = (void *) skb->data;
 119
 120         if (le16_to_cpu(hdr->len) < sizeof(*rej))
 121                 return -EINVAL;
 122
 123         BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
 124
 125         skb_pull(skb, sizeof(*rej));
 126
 127         return 0;
 128 }
 129
 130 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
 131                              struct a2mp_cmd *hdr)
 132 {
 133         struct a2mp_discov_req *req = (void *) skb->data;
 134         u16 len = le16_to_cpu(hdr->len);
 135         struct a2mp_discov_rsp *rsp;
 136         u16 ext_feat;
 137         u8 num_ctrl;
 138         struct hci_dev *hdev;
 139
 140         if (len < sizeof(*req))
 141                 return -EINVAL;
 142
 143         skb_pull(skb, sizeof(*req));
 144
 145         ext_feat = le16_to_cpu(req->ext_feat);
 146
 147         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
 148
 149         /* check that packet is not broken for now */
 150         while (ext_feat & A2MP_FEAT_EXT) {
 151                 if (len < sizeof(ext_feat))
 152                         return -EINVAL;
 153
 154                 ext_feat = get_unaligned_le16(skb->data);
 155                 BT_DBG("efm 0x%4.4x", ext_feat);
 156                 len -= sizeof(ext_feat);
 157                 skb_pull(skb, sizeof(ext_feat));
 158         }
 159
 160         read_lock(&hci_dev_list_lock);
 161
 162         /* at minimum the BR/EDR needs to be listed */
 163         num_ctrl = 1;
 164
 165         list_for_each_entry(hdev, &hci_dev_list, list) {
 166                 if (hdev->dev_type == HCI_AMP)
 167                         num_ctrl++;
 168         }
 169
 170         len = struct_size(rsp, cl, num_ctrl);
 171         rsp = kmalloc(len, GFP_ATOMIC);
 172         if (!rsp) {
 173                 read_unlock(&hci_dev_list_lock);
 174                 return -ENOMEM;
 175         }
 176
 177         rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
 178         rsp->ext_feat = 0;
 179
 180         __a2mp_add_cl(mgr, rsp->cl);
 181
 182         read_unlock(&hci_dev_list_lock);
 183
 184         a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
 185
 186         kfree(rsp);
 187         return 0;
 188 }
 189
 190 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 191                              struct a2mp_cmd *hdr)
 192 {
 193         struct a2mp_discov_rsp *rsp = (void *) skb->data;
 194         u16 len = le16_to_cpu(hdr->len);
 195         struct a2mp_cl *cl;
 196         u16 ext_feat;
 197         bool found = false;
 198
 199         if (len < sizeof(*rsp))
 200                 return -EINVAL;
 201
 202         len -= sizeof(*rsp);
 203         skb_pull(skb, sizeof(*rsp));
 204
 205         ext_feat = le16_to_cpu(rsp->ext_feat);
 206
 207         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
 208
 209         /* check that packet is not broken for now */
 210         while (ext_feat & A2MP_FEAT_EXT) {
 211                 if (len < sizeof(ext_feat))
 212                         return -EINVAL;
 213
 214                 ext_feat = get_unaligned_le16(skb->data);
 215                 BT_DBG("efm 0x%4.4x", ext_feat);
 216                 len -= sizeof(ext_feat);
 217                 skb_pull(skb, sizeof(ext_feat));
 218         }
 219
 220         cl = (void *) skb->data;
 221         while (len >= sizeof(*cl)) {
 222                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
 223                        cl->status);
 224
 225                 if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) {
 226                         struct a2mp_info_req req;
 227
 228                         found = true;
 229
 230                         memset(&req, 0, sizeof(req));
 231
 232                         req.id = cl->id;
 233                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 234                                   sizeof(req), &req);
 235                 }
 236
 237                 len -= sizeof(*cl);
 238                 cl = skb_pull(skb, sizeof(*cl));
 239         }
 240
 241         /* Fall back to L2CAP init sequence */
 242         if (!found) {
 243                 struct l2cap_conn *conn = mgr->l2cap_conn;
 244                 struct l2cap_chan *chan;
 245
 246                 mutex_lock(&conn->chan_lock);
 247
 248                 list_for_each_entry(chan, &conn->chan_l, list) {
 249
 250                         BT_DBG("chan %p state %s", chan,
 251                                state_to_string(chan->state));
 252
 253                         if (chan->scid == L2CAP_CID_A2MP)
 254                                 continue;
 255
 256                         l2cap_chan_lock(chan);
 257
 258                         if (chan->state == BT_CONNECT)
 259                                 l2cap_send_conn_req(chan);
 260
 261                         l2cap_chan_unlock(chan);
 262                 }
 263
 264                 mutex_unlock(&conn->chan_lock);
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 271                               struct a2mp_cmd *hdr)
 272 {
 273         struct a2mp_cl *cl = (void *) skb->data;
 274
 275         while (skb->len >= sizeof(*cl)) {
 276                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 277                        cl->status);
 278                 cl = skb_pull(skb, sizeof(*cl));
 279         }
 280
 281         /* TODO send A2MP_CHANGE_RSP */
 282
 283         return 0;
 284 }
 285
 286 static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status,
 287                                          u16 opcode)
 288 {
 289         BT_DBG("%s status 0x%2.2x", hdev->name, status);
 290
 291         a2mp_send_getinfo_rsp(hdev);
 292 }
 293
 294 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 295                             struct a2mp_cmd *hdr)
 296 {
 297         struct a2mp_info_req *req  = (void *) skb->data;
 298         struct hci_dev *hdev;
 299         struct hci_request hreq;
 300         int err = 0;
 301
 302         if (le16_to_cpu(hdr->len) < sizeof(*req))
 303                 return -EINVAL;
 304
 305         BT_DBG("id %d", req->id);
 306
 307         hdev = hci_dev_get(req->id);
 308         if (!hdev || hdev->dev_type != HCI_AMP) {
 309                 struct a2mp_info_rsp rsp;
 310
 311                 memset(&rsp, 0, sizeof(rsp));
 312
 313                 rsp.id = req->id;
 314                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 315
 316                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 317                           &rsp);
 318
 319                 goto done;
 320         }
 321
 322         set_bit(READ_LOC_AMP_INFO, &mgr->state);
 323         hci_req_init(&hreq, hdev);
 324         hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 325         err = hci_req_run(&hreq, read_local_amp_info_complete);
 326         if (err < 0)
 327                 a2mp_send_getinfo_rsp(hdev);
 328
 329 done:
 330         if (hdev)
 331                 hci_dev_put(hdev);
 332
 333         skb_pull(skb, sizeof(*req));
 334         return 0;
 335 }
 336
 337 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 338                             struct a2mp_cmd *hdr)
 339 {
 340         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
 341         struct a2mp_amp_assoc_req req;
 342         struct amp_ctrl *ctrl;
 343
 344         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
 345                 return -EINVAL;
 346
 347         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
 348
 349         if (rsp->status)
 350                 return -EINVAL;
 351
 352         ctrl = amp_ctrl_add(mgr, rsp->id);
 353         if (!ctrl)
 354                 return -ENOMEM;
 355
 356         memset(&req, 0, sizeof(req));
 357
 358         req.id = rsp->id;
 359         a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
 360                   &req);
 361
 362         skb_pull(skb, sizeof(*rsp));
 363         return 0;
 364 }
 365
 366 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
 367                                 struct a2mp_cmd *hdr)
 368 {
 369         struct a2mp_amp_assoc_req *req = (void *) skb->data;
 370         struct hci_dev *hdev;
 371         struct amp_mgr *tmp;
 372
 373         if (le16_to_cpu(hdr->len) < sizeof(*req))
 374                 return -EINVAL;
 375
 376         BT_DBG("id %d", req->id);
 377
 378         /* Make sure that other request is not processed */
 379         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 380
 381         hdev = hci_dev_get(req->id);
 382         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) {
 383                 struct a2mp_amp_assoc_rsp rsp;
 384                 rsp.id = req->id;
 385
 386                 memset(&rsp, 0, sizeof(rsp));
 387
 388                 if (tmp) {
 389                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 390                         amp_mgr_put(tmp);
 391                 } else {
 392                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 393                 }
 394
 395                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 396                           &rsp);
 397
 398                 goto done;
 399         }
 400
 401         amp_read_loc_assoc(hdev, mgr);
 402
 403 done:
 404         if (hdev)
 405                 hci_dev_put(hdev);
 406
 407         skb_pull(skb, sizeof(*req));
 408         return 0;
 409 }
 410
 411 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 412                                 struct a2mp_cmd *hdr)
 413 {
 414         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
 415         u16 len = le16_to_cpu(hdr->len);
 416         struct hci_dev *hdev;
 417         struct amp_ctrl *ctrl;
 418         struct hci_conn *hcon;
 419         size_t assoc_len;
 420
 421         if (len < sizeof(*rsp))
 422                 return -EINVAL;
 423
 424         assoc_len = len - sizeof(*rsp);
 425
 426         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
 427                assoc_len);
 428
 429         if (rsp->status)
 430                 return -EINVAL;
 431
 432         /* Save remote ASSOC data */
 433         ctrl = amp_ctrl_lookup(mgr, rsp->id);
 434         if (ctrl) {
 435                 u8 *assoc;
 436
 437                 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
 438                 if (!assoc) {
 439                         amp_ctrl_put(ctrl);
 440                         return -ENOMEM;
 441                 }
 442
 443                 ctrl->assoc = assoc;
 444                 ctrl->assoc_len = assoc_len;
 445                 ctrl->assoc_rem_len = assoc_len;
 446                 ctrl->assoc_len_so_far = 0;
 447
 448                 amp_ctrl_put(ctrl);
 449         }
 450
 451         /* Create Phys Link */
 452         hdev = hci_dev_get(rsp->id);
 453         if (!hdev)
 454                 return -EINVAL;
 455
 456         hcon = phylink_add(hdev, mgr, rsp->id, true);
 457         if (!hcon)
 458                 goto done;
 459
 460         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
 461
 462         mgr->bredr_chan->remote_amp_id = rsp->id;
 463
 464         amp_create_phylink(hdev, mgr, hcon);
 465
 466 done:
 467         hci_dev_put(hdev);
 468         skb_pull(skb, len);
 469         return 0;
 470 }
 471
 472 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 473                                    struct a2mp_cmd *hdr)
 474 {
 475         struct a2mp_physlink_req *req = (void *) skb->data;
 476         struct a2mp_physlink_rsp rsp;
 477         struct hci_dev *hdev;
 478         struct hci_conn *hcon;
 479         struct amp_ctrl *ctrl;
 480
 481         if (le16_to_cpu(hdr->len) < sizeof(*req))
 482                 return -EINVAL;
 483
 484         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 485
 486         memset(&rsp, 0, sizeof(rsp));
 487
 488         rsp.local_id = req->remote_id;
 489         rsp.remote_id = req->local_id;
 490
 491         hdev = hci_dev_get(req->remote_id);
 492         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) {
 493                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 494                 goto send_rsp;
 495         }
 496
 497         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
 498         if (!ctrl) {
 499                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
 500                 if (ctrl) {
 501                         amp_ctrl_get(ctrl);
 502                 } else {
 503                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 504                         goto send_rsp;
 505                 }
 506         }
 507
 508         if (ctrl) {
 509                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
 510                 u8 *assoc;
 511
 512                 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
 513                 if (!assoc) {
 514                         amp_ctrl_put(ctrl);
 515                         return -ENOMEM;
 516                 }
 517
 518                 ctrl->assoc = assoc;
 519                 ctrl->assoc_len = assoc_len;
 520                 ctrl->assoc_rem_len = assoc_len;
 521                 ctrl->assoc_len_so_far = 0;
 522
 523                 amp_ctrl_put(ctrl);
 524         }
 525
 526         hcon = phylink_add(hdev, mgr, req->local_id, false);
 527         if (hcon) {
 528                 amp_accept_phylink(hdev, mgr, hcon);
 529                 rsp.status = A2MP_STATUS_SUCCESS;
 530         } else {
 531                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 532         }
 533
 534 send_rsp:
 535         if (hdev)
 536                 hci_dev_put(hdev);
 537
 538         /* Reply error now and success after HCI Write Remote AMP Assoc
 539            command complete with success status
 540          */
 541         if (rsp.status != A2MP_STATUS_SUCCESS) {
 542                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 543                           sizeof(rsp), &rsp);
 544         } else {
 545                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 546                 mgr->ident = hdr->ident;
 547         }
 548
 549         skb_pull(skb, le16_to_cpu(hdr->len));
 550         return 0;
 551 }
 552
 553 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 554                                  struct a2mp_cmd *hdr)
 555 {
 556         struct a2mp_physlink_req *req = (void *) skb->data;
 557         struct a2mp_physlink_rsp rsp;
 558         struct hci_dev *hdev;
 559         struct hci_conn *hcon;
 560
 561         if (le16_to_cpu(hdr->len) < sizeof(*req))
 562                 return -EINVAL;
 563
 564         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 565
 566         memset(&rsp, 0, sizeof(rsp));
 567
 568         rsp.local_id = req->remote_id;
 569         rsp.remote_id = req->local_id;
 570         rsp.status = A2MP_STATUS_SUCCESS;
 571
 572         hdev = hci_dev_get(req->remote_id);
 573         if (!hdev) {
 574                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 575                 goto send_rsp;
 576         }
 577
 578         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
 579                                        &mgr->l2cap_conn->hcon->dst);
 580         if (!hcon) {
 581                 bt_dev_err(hdev, "no phys link exist");
 582                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 583                 goto clean;
 584         }
 585
 586         /* TODO Disconnect Phys Link here */
 587
 588 clean:
 589         hci_dev_put(hdev);
 590
 591 send_rsp:
 592         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 593
 594         skb_pull(skb, sizeof(*req));
 595         return 0;
 596 }
 597
 598 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 599                                struct a2mp_cmd *hdr)
 600 {
 601         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 602
 603         skb_pull(skb, le16_to_cpu(hdr->len));
 604         return 0;
 605 }
 606
 607 /* Handle A2MP signalling */
 608 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 609 {
 610         struct a2mp_cmd *hdr;
 611         struct amp_mgr *mgr = chan->data;
 612         int err = 0;
 613
 614         amp_mgr_get(mgr);
 615
 616         while (skb->len >= sizeof(*hdr)) {
 617                 u16 len;
 618
 619                 hdr = (void *) skb->data;
 620                 len = le16_to_cpu(hdr->len);
 621
 622                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 623
 624                 skb_pull(skb, sizeof(*hdr));
 625
 626                 if (len > skb->len || !hdr->ident) {
 627                         err = -EINVAL;
 628                         break;
 629                 }
 630
 631                 mgr->ident = hdr->ident;
 632
 633                 switch (hdr->code) {
 634                 case A2MP_COMMAND_REJ:
 635                         a2mp_command_rej(mgr, skb, hdr);
 636                         break;
 637
 638                 case A2MP_DISCOVER_REQ:
 639                         err = a2mp_discover_req(mgr, skb, hdr);
 640                         break;
 641
 642                 case A2MP_CHANGE_NOTIFY:
 643                         err = a2mp_change_notify(mgr, skb, hdr);
 644                         break;
 645
 646                 case A2MP_GETINFO_REQ:
 647                         err = a2mp_getinfo_req(mgr, skb, hdr);
 648                         break;
 649
 650                 case A2MP_GETAMPASSOC_REQ:
 651                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 652                         break;
 653
 654                 case A2MP_CREATEPHYSLINK_REQ:
 655                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 656                         break;
 657
 658                 case A2MP_DISCONNPHYSLINK_REQ:
 659                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 660                         break;
 661
 662                 case A2MP_DISCOVER_RSP:
 663                         err = a2mp_discover_rsp(mgr, skb, hdr);
 664                         break;
 665
 666                 case A2MP_GETINFO_RSP:
 667                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
 668                         break;
 669
 670                 case A2MP_GETAMPASSOC_RSP:
 671                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
 672                         break;
 673
 674                 case A2MP_CHANGE_RSP:
 675                 case A2MP_CREATEPHYSLINK_RSP:
 676                 case A2MP_DISCONNPHYSLINK_RSP:
 677                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 678                         break;
 679
 680                 default:
 681                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 682                         err = -EINVAL;
 683                         break;
 684                 }
 685         }
 686
 687         if (err) {
 688                 struct a2mp_cmd_rej rej;
 689
 690                 memset(&rej, 0, sizeof(rej));
 691
 692                 rej.reason = cpu_to_le16(0);
 693                 hdr = (void *) skb->data;
 694
 695                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 696
 697                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 698                           &rej);
 699         }
 700
 701         /* Always free skb and return success error code to prevent
 702            from sending L2CAP Disconnect over A2MP channel */
 703         kfree_skb(skb);
 704
 705         amp_mgr_put(mgr);
 706
 707         return 0;
 708 }
 709
 710 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 711 {
 712         l2cap_chan_put(chan);
 713 }
 714
 715 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state,
 716                                       int err)
 717 {
 718         struct amp_mgr *mgr = chan->data;
 719
 720         if (!mgr)
 721                 return;
 722
 723         BT_DBG("chan %p state %s", chan, state_to_string(state));
 724
 725         chan->state = state;
 726
 727         switch (state) {
 728         case BT_CLOSED:
 729                 if (mgr)
 730                         amp_mgr_put(mgr);
 731                 break;
 732         }
 733 }
 734
 735 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 736                                               unsigned long hdr_len,
 737                                               unsigned long len, int nb)
 738 {
 739         struct sk_buff *skb;
 740
 741         skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
 742         if (!skb)
 743                 return ERR_PTR(-ENOMEM);
 744
 745         return skb;
 746 }
 747
 748 static const struct l2cap_ops a2mp_chan_ops = {
 749         .name = "L2CAP A2MP channel",
 750         .recv = a2mp_chan_recv_cb,
 751         .close = a2mp_chan_close_cb,
 752         .state_change = a2mp_chan_state_change_cb,
 753         .alloc_skb = a2mp_chan_alloc_skb_cb,
 754
 755         /* Not implemented for A2MP */
 756         .new_connection = l2cap_chan_no_new_connection,
 757         .teardown = l2cap_chan_no_teardown,
 758         .ready = l2cap_chan_no_ready,
 759         .defer = l2cap_chan_no_defer,
 760         .resume = l2cap_chan_no_resume,
 761         .set_shutdown = l2cap_chan_no_set_shutdown,
 762         .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
 763 };
 764
 765 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 766 {
 767         struct l2cap_chan *chan;
 768         int err;
 769
 770         chan = l2cap_chan_create();
 771         if (!chan)
 772                 return NULL;
 773
 774         BT_DBG("chan %p", chan);
 775
 776         chan->chan_type = L2CAP_CHAN_FIXED;
 777         chan->scid = L2CAP_CID_A2MP;
 778         chan->dcid = L2CAP_CID_A2MP;
 779         chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
 780         chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
 781         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 782
 783         chan->ops = &a2mp_chan_ops;
 784
 785         l2cap_chan_set_defaults(chan);
 786         chan->remote_max_tx = chan->max_tx;
 787         chan->remote_tx_win = chan->tx_win;
 788
 789         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 790         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 791
 792         skb_queue_head_init(&chan->tx_q);
 793
 794         chan->mode = L2CAP_MODE_ERTM;
 795
 796         err = l2cap_ertm_init(chan);
 797         if (err < 0) {
 798                 l2cap_chan_del(chan, 0);
 799                 return NULL;
 800         }
 801
 802         chan->conf_state = 0;
 803
 804         if (locked)
 805                 __l2cap_chan_add(conn, chan);
 806         else
 807                 l2cap_chan_add(conn, chan);
 808
 809         chan->remote_mps = chan->omtu;
 810         chan->mps = chan->omtu;
 811
 812         chan->state = BT_CONNECTED;
 813
 814         return chan;
 815 }
 816
 817 /* AMP Manager functions */
 818 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 819 {
 820         BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
 821
 822         kref_get(&mgr->kref);
 823
 824         return mgr;
 825 }
 826
 827 static void amp_mgr_destroy(struct kref *kref)
 828 {
 829         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 830
 831         BT_DBG("mgr %p", mgr);
 832
 833         mutex_lock(&amp_mgr_list_lock);
 834         list_del(&mgr->list);
 835         mutex_unlock(&amp_mgr_list_lock);
 836
 837         amp_ctrl_list_flush(mgr);
 838         kfree(mgr);
 839 }
 840
 841 int amp_mgr_put(struct amp_mgr *mgr)
 842 {
 843         BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
 844
 845         return kref_put(&mgr->kref, &amp_mgr_destroy);
 846 }
 847
 848 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 849 {
 850         struct amp_mgr *mgr;
 851         struct l2cap_chan *chan;
 852
 853         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 854         if (!mgr)
 855                 return NULL;
 856
 857         BT_DBG("conn %p mgr %p", conn, mgr);
 858
 859         mgr->l2cap_conn = conn;
 860
 861         chan = a2mp_chan_open(conn, locked);
 862         if (!chan) {
 863                 kfree(mgr);
 864                 return NULL;
 865         }
 866
 867         mgr->a2mp_chan = chan;
 868         chan->data = mgr;
 869
 870         conn->hcon->amp_mgr = mgr;
 871
 872         kref_init(&mgr->kref);
 873
 874         /* Remote AMP ctrl list initialization */
 875         INIT_LIST_HEAD(&mgr->amp_ctrls);
 876         mutex_init(&mgr->amp_ctrls_lock);
 877
 878         mutex_lock(&amp_mgr_list_lock);
 879         list_add(&mgr->list, &amp_mgr_list);
 880         mutex_unlock(&amp_mgr_list_lock);
 881
 882         return mgr;
 883 }
 884
 885 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 886                                        struct sk_buff *skb)
 887 {
 888         struct amp_mgr *mgr;
 889
 890         if (conn->hcon->type != ACL_LINK)
 891                 return NULL;
 892
 893         mgr = amp_mgr_create(conn, false);
 894         if (!mgr) {
 895                 BT_ERR("Could not create AMP manager");
 896                 return NULL;
 897         }
 898
 899         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 900
 901         return mgr->a2mp_chan;
 902 }
 903
 904 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 905 {
 906         struct amp_mgr *mgr;
 907         struct a2mp_info_rsp rsp;
 908
 909         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 910         if (!mgr)
 911                 return;
 912
 913         BT_DBG("%s mgr %p", hdev->name, mgr);
 914
 915         memset(&rsp, 0, sizeof(rsp));
 916
 917         rsp.id = hdev->id;
 918         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 919
 920         if (hdev->amp_type != AMP_TYPE_BREDR) {
 921                 rsp.status = 0;
 922                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 923                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 924                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 925                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 926                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 927         }
 928
 929         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 930         amp_mgr_put(mgr);
 931 }
 932
 933 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 934 {
 935         struct amp_mgr *mgr;
 936         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 937         struct a2mp_amp_assoc_rsp *rsp;
 938         size_t len;
 939
 940         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 941         if (!mgr)
 942                 return;
 943
 944         BT_DBG("%s mgr %p", hdev->name, mgr);
 945
 946         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 947         rsp = kzalloc(len, GFP_KERNEL);
 948         if (!rsp) {
 949                 amp_mgr_put(mgr);
 950                 return;
 951         }
 952
 953         rsp->id = hdev->id;
 954
 955         if (status) {
 956                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 957         } else {
 958                 rsp->status = A2MP_STATUS_SUCCESS;
 959                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 960         }
 961
 962         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 963         amp_mgr_put(mgr);
 964         kfree(rsp);
 965 }
 966
 967 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 968 {
 969         struct amp_mgr *mgr;
 970         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 971         struct a2mp_physlink_req *req;
 972         struct l2cap_chan *bredr_chan;
 973         size_t len;
 974
 975         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 976         if (!mgr)
 977                 return;
 978
 979         len = sizeof(*req) + loc_assoc->len;
 980
 981         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 982
 983         req = kzalloc(len, GFP_KERNEL);
 984         if (!req) {
 985                 amp_mgr_put(mgr);
 986                 return;
 987         }
 988
 989         bredr_chan = mgr->bredr_chan;
 990         if (!bredr_chan)
 991                 goto clean;
 992
 993         req->local_id = hdev->id;
 994         req->remote_id = bredr_chan->remote_amp_id;
 995         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
 996
 997         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
 998
 999 clean:
1000         amp_mgr_put(mgr);
1001         kfree(req);
1002 }
1003
1004 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
1005 {
1006         struct amp_mgr *mgr;
1007         struct a2mp_physlink_rsp rsp;
1008         struct hci_conn *hs_hcon;
1009
1010         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
1011         if (!mgr)
1012                 return;
1013
1014         memset(&rsp, 0, sizeof(rsp));
1015
1016         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
1017         if (!hs_hcon) {
1018                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
1019         } else {
1020                 rsp.remote_id = hs_hcon->remote_id;
1021                 rsp.status = A2MP_STATUS_SUCCESS;
1022         }
1023
1024         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
1025                status);
1026
1027         rsp.local_id = hdev->id;
1028         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
1029         amp_mgr_put(mgr);
1030 }
1031
1032 void a2mp_discover_amp(struct l2cap_chan *chan)
1033 {
1034         struct l2cap_conn *conn = chan->conn;
1035         struct amp_mgr *mgr = conn->hcon->amp_mgr;
1036         struct a2mp_discov_req req;
1037
1038         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
1039
1040         if (!mgr) {
1041                 mgr = amp_mgr_create(conn, true);
1042                 if (!mgr)
1043                         return;
1044         }
1045
1046         mgr->bredr_chan = chan;
1047
1048         memset(&req, 0, sizeof(req));
1049
1050         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1051         req.ext_feat = 0;
1052         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1053 }