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                         req.id = cl->id;
 237                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
 238                                   sizeof(req), &req);
 239                 }
 240
 241                 len -= sizeof(*cl);
 242                 cl = (void *) skb_pull(skb, sizeof(*cl));
 243         }
 244
 245         /* Fall back to L2CAP init sequence */
 246         if (!found) {
 247                 struct l2cap_conn *conn = mgr->l2cap_conn;
 248                 struct l2cap_chan *chan;
 249
 250                 mutex_lock(&conn->chan_lock);
 251
 252                 list_for_each_entry(chan, &conn->chan_l, list) {
 253
 254                         BT_DBG("chan %p state %s", chan,
 255                                state_to_string(chan->state));
 256
 257                         if (chan->scid == L2CAP_CID_A2MP)
 258                                 continue;
 259
 260                         l2cap_chan_lock(chan);
 261
 262                         if (chan->state == BT_CONNECT)
 263                                 l2cap_send_conn_req(chan);
 264
 265                         l2cap_chan_unlock(chan);
 266                 }
 267
 268                 mutex_unlock(&conn->chan_lock);
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
 275                               struct a2mp_cmd *hdr)
 276 {
 277         struct a2mp_cl *cl = (void *) skb->data;
 278
 279         while (skb->len >= sizeof(*cl)) {
 280                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
 281                        cl->status);
 282                 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
 283         }
 284
 285         /* TODO send A2MP_CHANGE_RSP */
 286
 287         return 0;
 288 }
 289
 290 static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status,
 291                                          u16 opcode)
 292 {
 293         BT_DBG("%s status 0x%2.2x", hdev->name, status);
 294
 295         a2mp_send_getinfo_rsp(hdev);
 296 }
 297
 298 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 299                             struct a2mp_cmd *hdr)
 300 {
 301         struct a2mp_info_req *req  = (void *) skb->data;
 302         struct hci_dev *hdev;
 303         struct hci_request hreq;
 304         int err = 0;
 305
 306         if (le16_to_cpu(hdr->len) < sizeof(*req))
 307                 return -EINVAL;
 308
 309         BT_DBG("id %d", req->id);
 310
 311         hdev = hci_dev_get(req->id);
 312         if (!hdev || hdev->dev_type != HCI_AMP) {
 313                 struct a2mp_info_rsp rsp;
 314
 315                 rsp.id = req->id;
 316                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 317
 318                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
 319                           &rsp);
 320
 321                 goto done;
 322         }
 323
 324         set_bit(READ_LOC_AMP_INFO, &mgr->state);
 325         hci_req_init(&hreq, hdev);
 326         hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 327         err = hci_req_run(&hreq, read_local_amp_info_complete);
 328         if (err < 0)
 329                 a2mp_send_getinfo_rsp(hdev);
 330
 331 done:
 332         if (hdev)
 333                 hci_dev_put(hdev);
 334
 335         skb_pull(skb, sizeof(*req));
 336         return 0;
 337 }
 338
 339 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 340                             struct a2mp_cmd *hdr)
 341 {
 342         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
 343         struct a2mp_amp_assoc_req req;
 344         struct amp_ctrl *ctrl;
 345
 346         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
 347                 return -EINVAL;
 348
 349         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
 350
 351         if (rsp->status)
 352                 return -EINVAL;
 353
 354         ctrl = amp_ctrl_add(mgr, rsp->id);
 355         if (!ctrl)
 356                 return -ENOMEM;
 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                 if (tmp) {
 387                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
 388                         amp_mgr_put(tmp);
 389                 } else {
 390                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 391                 }
 392
 393                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
 394                           &rsp);
 395
 396                 goto done;
 397         }
 398
 399         amp_read_loc_assoc(hdev, mgr);
 400
 401 done:
 402         if (hdev)
 403                 hci_dev_put(hdev);
 404
 405         skb_pull(skb, sizeof(*req));
 406         return 0;
 407 }
 408
 409 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 410                                 struct a2mp_cmd *hdr)
 411 {
 412         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
 413         u16 len = le16_to_cpu(hdr->len);
 414         struct hci_dev *hdev;
 415         struct amp_ctrl *ctrl;
 416         struct hci_conn *hcon;
 417         size_t assoc_len;
 418
 419         if (len < sizeof(*rsp))
 420                 return -EINVAL;
 421
 422         assoc_len = len - sizeof(*rsp);
 423
 424         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
 425                assoc_len);
 426
 427         if (rsp->status)
 428                 return -EINVAL;
 429
 430         /* Save remote ASSOC data */
 431         ctrl = amp_ctrl_lookup(mgr, rsp->id);
 432         if (ctrl) {
 433                 u8 *assoc;
 434
 435                 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
 436                 if (!assoc) {
 437                         amp_ctrl_put(ctrl);
 438                         return -ENOMEM;
 439                 }
 440
 441                 ctrl->assoc = assoc;
 442                 ctrl->assoc_len = assoc_len;
 443                 ctrl->assoc_rem_len = assoc_len;
 444                 ctrl->assoc_len_so_far = 0;
 445
 446                 amp_ctrl_put(ctrl);
 447         }
 448
 449         /* Create Phys Link */
 450         hdev = hci_dev_get(rsp->id);
 451         if (!hdev)
 452                 return -EINVAL;
 453
 454         hcon = phylink_add(hdev, mgr, rsp->id, true);
 455         if (!hcon)
 456                 goto done;
 457
 458         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
 459
 460         mgr->bredr_chan->remote_amp_id = rsp->id;
 461
 462         amp_create_phylink(hdev, mgr, hcon);
 463
 464 done:
 465         hci_dev_put(hdev);
 466         skb_pull(skb, len);
 467         return 0;
 468 }
 469
 470 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 471                                    struct a2mp_cmd *hdr)
 472 {
 473         struct a2mp_physlink_req *req = (void *) skb->data;
 474
 475         struct a2mp_physlink_rsp rsp;
 476         struct hci_dev *hdev;
 477         struct hci_conn *hcon;
 478         struct amp_ctrl *ctrl;
 479
 480         if (le16_to_cpu(hdr->len) < sizeof(*req))
 481                 return -EINVAL;
 482
 483         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
 484
 485         rsp.local_id = req->remote_id;
 486         rsp.remote_id = req->local_id;
 487
 488         hdev = hci_dev_get(req->remote_id);
 489         if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) {
 490                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 491                 goto send_rsp;
 492         }
 493
 494         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
 495         if (!ctrl) {
 496                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
 497                 if (ctrl) {
 498                         amp_ctrl_get(ctrl);
 499                 } else {
 500                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 501                         goto send_rsp;
 502                 }
 503         }
 504
 505         if (ctrl) {
 506                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
 507                 u8 *assoc;
 508
 509                 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
 510                 if (!assoc) {
 511                         amp_ctrl_put(ctrl);
 512                         return -ENOMEM;
 513                 }
 514
 515                 ctrl->assoc = assoc;
 516                 ctrl->assoc_len = assoc_len;
 517                 ctrl->assoc_rem_len = assoc_len;
 518                 ctrl->assoc_len_so_far = 0;
 519
 520                 amp_ctrl_put(ctrl);
 521         }
 522
 523         hcon = phylink_add(hdev, mgr, req->local_id, false);
 524         if (hcon) {
 525                 amp_accept_phylink(hdev, mgr, hcon);
 526                 rsp.status = A2MP_STATUS_SUCCESS;
 527         } else {
 528                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
 529         }
 530
 531 send_rsp:
 532         if (hdev)
 533                 hci_dev_put(hdev);
 534
 535         /* Reply error now and success after HCI Write Remote AMP Assoc
 536            command complete with success status
 537          */
 538         if (rsp.status != A2MP_STATUS_SUCCESS) {
 539                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
 540                           sizeof(rsp), &rsp);
 541         } else {
 542                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
 543                 mgr->ident = hdr->ident;
 544         }
 545
 546         skb_pull(skb, le16_to_cpu(hdr->len));
 547         return 0;
 548 }
 549
 550 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 551                                  struct a2mp_cmd *hdr)
 552 {
 553         struct a2mp_physlink_req *req = (void *) skb->data;
 554         struct a2mp_physlink_rsp rsp;
 555         struct hci_dev *hdev;
 556         struct hci_conn *hcon;
 557
 558         if (le16_to_cpu(hdr->len) < sizeof(*req))
 559                 return -EINVAL;
 560
 561         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
 562
 563         rsp.local_id = req->remote_id;
 564         rsp.remote_id = req->local_id;
 565         rsp.status = A2MP_STATUS_SUCCESS;
 566
 567         hdev = hci_dev_get(req->remote_id);
 568         if (!hdev) {
 569                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 570                 goto send_rsp;
 571         }
 572
 573         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
 574                                        &mgr->l2cap_conn->hcon->dst);
 575         if (!hcon) {
 576                 BT_ERR("No phys link exist");
 577                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
 578                 goto clean;
 579         }
 580
 581         /* TODO Disconnect Phys Link here */
 582
 583 clean:
 584         hci_dev_put(hdev);
 585
 586 send_rsp:
 587         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
 588
 589         skb_pull(skb, sizeof(*req));
 590         return 0;
 591 }
 592
 593 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
 594                                struct a2mp_cmd *hdr)
 595 {
 596         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
 597
 598         skb_pull(skb, le16_to_cpu(hdr->len));
 599         return 0;
 600 }
 601
 602 /* Handle A2MP signalling */
 603 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
 604 {
 605         struct a2mp_cmd *hdr;
 606         struct amp_mgr *mgr = chan->data;
 607         int err = 0;
 608
 609         amp_mgr_get(mgr);
 610
 611         while (skb->len >= sizeof(*hdr)) {
 612                 u16 len;
 613
 614                 hdr = (void *) skb->data;
 615                 len = le16_to_cpu(hdr->len);
 616
 617                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
 618
 619                 skb_pull(skb, sizeof(*hdr));
 620
 621                 if (len > skb->len || !hdr->ident) {
 622                         err = -EINVAL;
 623                         break;
 624                 }
 625
 626                 mgr->ident = hdr->ident;
 627
 628                 switch (hdr->code) {
 629                 case A2MP_COMMAND_REJ:
 630                         a2mp_command_rej(mgr, skb, hdr);
 631                         break;
 632
 633                 case A2MP_DISCOVER_REQ:
 634                         err = a2mp_discover_req(mgr, skb, hdr);
 635                         break;
 636
 637                 case A2MP_CHANGE_NOTIFY:
 638                         err = a2mp_change_notify(mgr, skb, hdr);
 639                         break;
 640
 641                 case A2MP_GETINFO_REQ:
 642                         err = a2mp_getinfo_req(mgr, skb, hdr);
 643                         break;
 644
 645                 case A2MP_GETAMPASSOC_REQ:
 646                         err = a2mp_getampassoc_req(mgr, skb, hdr);
 647                         break;
 648
 649                 case A2MP_CREATEPHYSLINK_REQ:
 650                         err = a2mp_createphyslink_req(mgr, skb, hdr);
 651                         break;
 652
 653                 case A2MP_DISCONNPHYSLINK_REQ:
 654                         err = a2mp_discphyslink_req(mgr, skb, hdr);
 655                         break;
 656
 657                 case A2MP_DISCOVER_RSP:
 658                         err = a2mp_discover_rsp(mgr, skb, hdr);
 659                         break;
 660
 661                 case A2MP_GETINFO_RSP:
 662                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
 663                         break;
 664
 665                 case A2MP_GETAMPASSOC_RSP:
 666                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
 667                         break;
 668
 669                 case A2MP_CHANGE_RSP:
 670                 case A2MP_CREATEPHYSLINK_RSP:
 671                 case A2MP_DISCONNPHYSLINK_RSP:
 672                         err = a2mp_cmd_rsp(mgr, skb, hdr);
 673                         break;
 674
 675                 default:
 676                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
 677                         err = -EINVAL;
 678                         break;
 679                 }
 680         }
 681
 682         if (err) {
 683                 struct a2mp_cmd_rej rej;
 684
 685                 rej.reason = cpu_to_le16(0);
 686                 hdr = (void *) skb->data;
 687
 688                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
 689
 690                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
 691                           &rej);
 692         }
 693
 694         /* Always free skb and return success error code to prevent
 695            from sending L2CAP Disconnect over A2MP channel */
 696         kfree_skb(skb);
 697
 698         amp_mgr_put(mgr);
 699
 700         return 0;
 701 }
 702
 703 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
 704 {
 705         l2cap_chan_put(chan);
 706 }
 707
 708 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state,
 709                                       int err)
 710 {
 711         struct amp_mgr *mgr = chan->data;
 712
 713         if (!mgr)
 714                 return;
 715
 716         BT_DBG("chan %p state %s", chan, state_to_string(state));
 717
 718         chan->state = state;
 719
 720         switch (state) {
 721         case BT_CLOSED:
 722                 if (mgr)
 723                         amp_mgr_put(mgr);
 724                 break;
 725         }
 726 }
 727
 728 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
 729                                               unsigned long hdr_len,
 730                                               unsigned long len, int nb)
 731 {
 732         struct sk_buff *skb;
 733
 734         skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
 735         if (!skb)
 736                 return ERR_PTR(-ENOMEM);
 737
 738         return skb;
 739 }
 740
 741 static const struct l2cap_ops a2mp_chan_ops = {
 742         .name = "L2CAP A2MP channel",
 743         .recv = a2mp_chan_recv_cb,
 744         .close = a2mp_chan_close_cb,
 745         .state_change = a2mp_chan_state_change_cb,
 746         .alloc_skb = a2mp_chan_alloc_skb_cb,
 747
 748         /* Not implemented for A2MP */
 749         .new_connection = l2cap_chan_no_new_connection,
 750         .teardown = l2cap_chan_no_teardown,
 751         .ready = l2cap_chan_no_ready,
 752         .defer = l2cap_chan_no_defer,
 753         .resume = l2cap_chan_no_resume,
 754         .set_shutdown = l2cap_chan_no_set_shutdown,
 755         .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
 756 };
 757
 758 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
 759 {
 760         struct l2cap_chan *chan;
 761         int err;
 762
 763         chan = l2cap_chan_create();
 764         if (!chan)
 765                 return NULL;
 766
 767         BT_DBG("chan %p", chan);
 768
 769         chan->chan_type = L2CAP_CHAN_FIXED;
 770         chan->scid = L2CAP_CID_A2MP;
 771         chan->dcid = L2CAP_CID_A2MP;
 772         chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
 773         chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
 774         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 775
 776         chan->ops = &a2mp_chan_ops;
 777
 778         l2cap_chan_set_defaults(chan);
 779         chan->remote_max_tx = chan->max_tx;
 780         chan->remote_tx_win = chan->tx_win;
 781
 782         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
 783         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
 784
 785         skb_queue_head_init(&chan->tx_q);
 786
 787         chan->mode = L2CAP_MODE_ERTM;
 788
 789         err = l2cap_ertm_init(chan);
 790         if (err < 0) {
 791                 l2cap_chan_del(chan, 0);
 792                 return NULL;
 793         }
 794
 795         chan->conf_state = 0;
 796
 797         if (locked)
 798                 __l2cap_chan_add(conn, chan);
 799         else
 800                 l2cap_chan_add(conn, chan);
 801
 802         chan->remote_mps = chan->omtu;
 803         chan->mps = chan->omtu;
 804
 805         chan->state = BT_CONNECTED;
 806
 807         return chan;
 808 }
 809
 810 /* AMP Manager functions */
 811 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
 812 {
 813         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 814
 815         kref_get(&mgr->kref);
 816
 817         return mgr;
 818 }
 819
 820 static void amp_mgr_destroy(struct kref *kref)
 821 {
 822         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
 823
 824         BT_DBG("mgr %p", mgr);
 825
 826         mutex_lock(&amp_mgr_list_lock);
 827         list_del(&mgr->list);
 828         mutex_unlock(&amp_mgr_list_lock);
 829
 830         amp_ctrl_list_flush(mgr);
 831         kfree(mgr);
 832 }
 833
 834 int amp_mgr_put(struct amp_mgr *mgr)
 835 {
 836         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
 837
 838         return kref_put(&mgr->kref, &amp_mgr_destroy);
 839 }
 840
 841 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
 842 {
 843         struct amp_mgr *mgr;
 844         struct l2cap_chan *chan;
 845
 846         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 847         if (!mgr)
 848                 return NULL;
 849
 850         BT_DBG("conn %p mgr %p", conn, mgr);
 851
 852         mgr->l2cap_conn = conn;
 853
 854         chan = a2mp_chan_open(conn, locked);
 855         if (!chan) {
 856                 kfree(mgr);
 857                 return NULL;
 858         }
 859
 860         mgr->a2mp_chan = chan;
 861         chan->data = mgr;
 862
 863         conn->hcon->amp_mgr = mgr;
 864
 865         kref_init(&mgr->kref);
 866
 867         /* Remote AMP ctrl list initialization */
 868         INIT_LIST_HEAD(&mgr->amp_ctrls);
 869         mutex_init(&mgr->amp_ctrls_lock);
 870
 871         mutex_lock(&amp_mgr_list_lock);
 872         list_add(&mgr->list, &amp_mgr_list);
 873         mutex_unlock(&amp_mgr_list_lock);
 874
 875         return mgr;
 876 }
 877
 878 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
 879                                        struct sk_buff *skb)
 880 {
 881         struct amp_mgr *mgr;
 882
 883         if (conn->hcon->type != ACL_LINK)
 884                 return NULL;
 885
 886         mgr = amp_mgr_create(conn, false);
 887         if (!mgr) {
 888                 BT_ERR("Could not create AMP manager");
 889                 return NULL;
 890         }
 891
 892         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
 893
 894         return mgr->a2mp_chan;
 895 }
 896
 897 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
 898 {
 899         struct amp_mgr *mgr;
 900         struct a2mp_info_rsp rsp;
 901
 902         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
 903         if (!mgr)
 904                 return;
 905
 906         BT_DBG("%s mgr %p", hdev->name, mgr);
 907
 908         rsp.id = hdev->id;
 909         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
 910
 911         if (hdev->amp_type != AMP_TYPE_BREDR) {
 912                 rsp.status = 0;
 913                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
 914                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
 915                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
 916                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
 917                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
 918         }
 919
 920         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
 921         amp_mgr_put(mgr);
 922 }
 923
 924 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
 925 {
 926         struct amp_mgr *mgr;
 927         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 928         struct a2mp_amp_assoc_rsp *rsp;
 929         size_t len;
 930
 931         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
 932         if (!mgr)
 933                 return;
 934
 935         BT_DBG("%s mgr %p", hdev->name, mgr);
 936
 937         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
 938         rsp = kzalloc(len, GFP_KERNEL);
 939         if (!rsp) {
 940                 amp_mgr_put(mgr);
 941                 return;
 942         }
 943
 944         rsp->id = hdev->id;
 945
 946         if (status) {
 947                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
 948         } else {
 949                 rsp->status = A2MP_STATUS_SUCCESS;
 950                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
 951         }
 952
 953         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
 954         amp_mgr_put(mgr);
 955         kfree(rsp);
 956 }
 957
 958 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
 959 {
 960         struct amp_mgr *mgr;
 961         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
 962         struct a2mp_physlink_req *req;
 963         struct l2cap_chan *bredr_chan;
 964         size_t len;
 965
 966         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
 967         if (!mgr)
 968                 return;
 969
 970         len = sizeof(*req) + loc_assoc->len;
 971
 972         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
 973
 974         req = kzalloc(len, GFP_KERNEL);
 975         if (!req) {
 976                 amp_mgr_put(mgr);
 977                 return;
 978         }
 979
 980         bredr_chan = mgr->bredr_chan;
 981         if (!bredr_chan)
 982                 goto clean;
 983
 984         req->local_id = hdev->id;
 985         req->remote_id = bredr_chan->remote_amp_id;
 986         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
 987
 988         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
 989
 990 clean:
 991         amp_mgr_put(mgr);
 992         kfree(req);
 993 }
 994
 995 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
 996 {
 997         struct amp_mgr *mgr;
 998         struct a2mp_physlink_rsp rsp;
 999         struct hci_conn *hs_hcon;
1000
1001         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
1002         if (!mgr)
1003                 return;
1004
1005         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
1006         if (!hs_hcon) {
1007                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
1008         } else {
1009                 rsp.remote_id = hs_hcon->remote_id;
1010                 rsp.status = A2MP_STATUS_SUCCESS;
1011         }
1012
1013         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
1014                status);
1015
1016         rsp.local_id = hdev->id;
1017         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
1018         amp_mgr_put(mgr);
1019 }
1020
1021 void a2mp_discover_amp(struct l2cap_chan *chan)
1022 {
1023         struct l2cap_conn *conn = chan->conn;
1024         struct amp_mgr *mgr = conn->hcon->amp_mgr;
1025         struct a2mp_discov_req req;
1026
1027         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
1028
1029         if (!mgr) {
1030                 mgr = amp_mgr_create(conn, true);
1031                 if (!mgr)
1032                         return;
1033         }
1034
1035         mgr->bredr_chan = chan;
1036
1037         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1038         req.ext_feat = 0;
1039         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1040 }