net/nfc/nci/hci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  The NFC Controller Interface is the communication protocol between an
   4  *  NFC Controller (NFCC) and a Device Host (DH).
   5  *  This is the HCI over NCI implementation, as specified in the 10.2
   6  *  section of the NCI 1.1 specification.
   7  *
   8  *  Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
   9  */
  10
  11 #include <linux/skbuff.h>
  12
  13 #include "../nfc.h"
  14 #include <net/nfc/nci.h>
  15 #include <net/nfc/nci_core.h>
  16 #include <linux/nfc.h>
  17
  18 struct nci_data {
  19         u8              conn_id;
  20         u8              pipe;
  21         u8              cmd;
  22         const u8        *data;
  23         u32             data_len;
  24 } __packed;
  25
  26 struct nci_hci_create_pipe_params {
  27         u8 src_gate;
  28         u8 dest_host;
  29         u8 dest_gate;
  30 } __packed;
  31
  32 struct nci_hci_create_pipe_resp {
  33         u8 src_host;
  34         u8 src_gate;
  35         u8 dest_host;
  36         u8 dest_gate;
  37         u8 pipe;
  38 } __packed;
  39
  40 struct nci_hci_delete_pipe_noti {
  41         u8 pipe;
  42 } __packed;
  43
  44 struct nci_hci_all_pipe_cleared_noti {
  45         u8 host;
  46 } __packed;
  47
  48 struct nci_hcp_message {
  49         u8 header;      /* type -cmd,evt,rsp- + instruction */
  50         u8 data[];
  51 } __packed;
  52
  53 struct nci_hcp_packet {
  54         u8 header;      /* cbit+pipe */
  55         struct nci_hcp_message message;
  56 } __packed;
  57
  58 #define NCI_HCI_ANY_SET_PARAMETER  0x01
  59 #define NCI_HCI_ANY_GET_PARAMETER  0x02
  60 #define NCI_HCI_ANY_CLOSE_PIPE     0x04
  61 #define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
  62
  63 #define NCI_HFP_NO_CHAINING        0x80
  64
  65 #define NCI_NFCEE_ID_HCI                0x80
  66
  67 #define NCI_EVT_HOT_PLUG           0x03
  68
  69 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  70 #define NCI_HCI_ADM_CREATE_PIPE                 0x10
  71 #define NCI_HCI_ADM_DELETE_PIPE                 0x11
  72
  73 /* HCP headers */
  74 #define NCI_HCI_HCP_PACKET_HEADER_LEN      1
  75 #define NCI_HCI_HCP_MESSAGE_HEADER_LEN     1
  76 #define NCI_HCI_HCP_HEADER_LEN             2
  77
  78 /* HCP types */
  79 #define NCI_HCI_HCP_COMMAND        0x00
  80 #define NCI_HCI_HCP_EVENT          0x01
  81 #define NCI_HCI_HCP_RESPONSE       0x02
  82
  83 #define NCI_HCI_ADM_NOTIFY_PIPE_CREATED     0x12
  84 #define NCI_HCI_ADM_NOTIFY_PIPE_DELETED     0x13
  85 #define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
  86
  87 #define NCI_HCI_FRAGMENT           0x7f
  88 #define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
  89                                       ((instr) & 0x3f))
  90
  91 #define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
  92 #define NCI_HCP_MSG_GET_CMD(header)  (header & 0x3f)
  93 #define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
  94
  95 static int nci_hci_result_to_errno(u8 result)
  96 {
  97         switch (result) {
  98         case NCI_HCI_ANY_OK:
  99                 return 0;
 100         case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
 101                 return -EOPNOTSUPP;
 102         case NCI_HCI_ANY_E_TIMEOUT:
 103                 return -ETIME;
 104         default:
 105                 return -1;
 106         }
 107 }
 108
 109 /* HCI core */
 110 static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
 111 {
 112         int i;
 113
 114         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 115                 hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 116                 hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
 117         }
 118         memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 119 }
 120
 121 static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
 122 {
 123         int i;
 124
 125         for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
 126                 if (ndev->hci_dev->pipes[i].host == host) {
 127                         ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
 128                         ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
 129                 }
 130         }
 131 }
 132
 133 /* Fragment HCI data over NCI packet.
 134  * NFC Forum NCI 10.2.2 Data Exchange:
 135  * The payload of the Data Packets sent on the Logical Connection SHALL be
 136  * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
 137  * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
 138  * applied to Data Messages in either direction. The HCI fragmentation mechanism
 139  * is used if required.
 140  */
 141 static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
 142                              const u8 data_type, const u8 *data,
 143                              size_t data_len)
 144 {
 145         struct nci_conn_info    *conn_info;
 146         struct sk_buff *skb;
 147         int len, i, r;
 148         u8 cb = pipe;
 149
 150         conn_info = ndev->hci_dev->conn_info;
 151         if (!conn_info)
 152                 return -EPROTO;
 153
 154         i = 0;
 155         skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
 156                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
 157         if (!skb)
 158                 return -ENOMEM;
 159
 160         skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
 161         *(u8 *)skb_push(skb, 1) = data_type;
 162
 163         do {
 164                 len = conn_info->max_pkt_payload_len;
 165
 166                 /* If last packet add NCI_HFP_NO_CHAINING */
 167                 if (i + conn_info->max_pkt_payload_len -
 168                     (skb->len + 1) >= data_len) {
 169                         cb |= NCI_HFP_NO_CHAINING;
 170                         len = data_len - i;
 171                 } else {
 172                         len = conn_info->max_pkt_payload_len - skb->len - 1;
 173                 }
 174
 175                 *(u8 *)skb_push(skb, 1) = cb;
 176
 177                 if (len > 0)
 178                         skb_put_data(skb, data + i, len);
 179
 180                 r = nci_send_data(ndev, conn_info->conn_id, skb);
 181                 if (r < 0)
 182                         return r;
 183
 184                 i += len;
 185
 186                 if (i < data_len) {
 187                         skb = nci_skb_alloc(ndev,
 188                                             conn_info->max_pkt_payload_len +
 189                                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
 190                         if (!skb)
 191                                 return -ENOMEM;
 192
 193                         skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
 194                 }
 195         } while (i < data_len);
 196
 197         return i;
 198 }
 199
 200 static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
 201 {
 202         struct nci_data *data = (struct nci_data *)opt;
 203
 204         nci_hci_send_data(ndev, data->pipe, data->cmd,
 205                           data->data, data->data_len);
 206 }
 207
 208 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
 209                        const u8 *param, size_t param_len)
 210 {
 211         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 212
 213         if (pipe == NCI_HCI_INVALID_PIPE)
 214                 return -EADDRNOTAVAIL;
 215
 216         return nci_hci_send_data(ndev, pipe,
 217                         NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
 218                         param, param_len);
 219 }
 220 EXPORT_SYMBOL(nci_hci_send_event);
 221
 222 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 223                      const u8 *param, size_t param_len,
 224                      struct sk_buff **skb)
 225 {
 226         struct nci_hcp_message *message;
 227         struct nci_conn_info   *conn_info;
 228         struct nci_data data;
 229         int r;
 230         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 231
 232         if (pipe == NCI_HCI_INVALID_PIPE)
 233                 return -EADDRNOTAVAIL;
 234
 235         conn_info = ndev->hci_dev->conn_info;
 236         if (!conn_info)
 237                 return -EPROTO;
 238
 239         data.conn_id = conn_info->conn_id;
 240         data.pipe = pipe;
 241         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
 242         data.data = param;
 243         data.data_len = param_len;
 244
 245         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 246                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 247         if (r == NCI_STATUS_OK) {
 248                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 249                 r = nci_hci_result_to_errno(
 250                         NCI_HCP_MSG_GET_CMD(message->header));
 251                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 252
 253                 if (!r && skb)
 254                         *skb = conn_info->rx_skb;
 255         }
 256
 257         return r;
 258 }
 259 EXPORT_SYMBOL(nci_hci_send_cmd);
 260
 261 int nci_hci_clear_all_pipes(struct nci_dev *ndev)
 262 {
 263         int r;
 264
 265         r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 266                              NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
 267         if (r < 0)
 268                 return r;
 269
 270         nci_hci_reset_pipes(ndev->hci_dev);
 271         return r;
 272 }
 273 EXPORT_SYMBOL(nci_hci_clear_all_pipes);
 274
 275 static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 276                                    u8 event, struct sk_buff *skb)
 277 {
 278         if (ndev->ops->hci_event_received)
 279                 ndev->ops->hci_event_received(ndev, pipe, event, skb);
 280 }
 281
 282 static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
 283                                  u8 cmd, struct sk_buff *skb)
 284 {
 285         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 286         u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
 287         u8 dest_gate, new_pipe;
 288         struct nci_hci_create_pipe_resp *create_info;
 289         struct nci_hci_delete_pipe_noti *delete_info;
 290         struct nci_hci_all_pipe_cleared_noti *cleared_info;
 291
 292         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 293
 294         switch (cmd) {
 295         case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
 296                 if (skb->len != 5) {
 297                         status = NCI_HCI_ANY_E_NOK;
 298                         goto exit;
 299                 }
 300                 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
 301                 dest_gate = create_info->dest_gate;
 302                 new_pipe = create_info->pipe;
 303                 if (new_pipe >= NCI_HCI_MAX_PIPES) {
 304                         status = NCI_HCI_ANY_E_NOK;
 305                         goto exit;
 306                 }
 307
 308                 /* Save the new created pipe and bind with local gate,
 309                  * the description for skb->data[3] is destination gate id
 310                  * but since we received this cmd from host controller, we
 311                  * are the destination and it is our local gate
 312                  */
 313                 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
 314                 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
 315                 ndev->hci_dev->pipes[new_pipe].host =
 316                                                 create_info->src_host;
 317                 break;
 318         case NCI_HCI_ANY_OPEN_PIPE:
 319                 /* If the pipe is not created report an error */
 320                 if (gate == NCI_HCI_INVALID_GATE) {
 321                         status = NCI_HCI_ANY_E_NOK;
 322                         goto exit;
 323                 }
 324                 break;
 325         case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
 326                 if (skb->len != 1) {
 327                         status = NCI_HCI_ANY_E_NOK;
 328                         goto exit;
 329                 }
 330                 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
 331                 if (delete_info->pipe >= NCI_HCI_MAX_PIPES) {
 332                         status = NCI_HCI_ANY_E_NOK;
 333                         goto exit;
 334                 }
 335
 336                 ndev->hci_dev->pipes[delete_info->pipe].gate =
 337                                                 NCI_HCI_INVALID_GATE;
 338                 ndev->hci_dev->pipes[delete_info->pipe].host =
 339                                                 NCI_HCI_INVALID_HOST;
 340                 break;
 341         case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 342                 if (skb->len != 1) {
 343                         status = NCI_HCI_ANY_E_NOK;
 344                         goto exit;
 345                 }
 346
 347                 cleared_info =
 348                         (struct nci_hci_all_pipe_cleared_noti *)skb->data;
 349                 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
 350                 break;
 351         default:
 352                 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 353                 break;
 354         }
 355
 356         if (ndev->ops->hci_cmd_received)
 357                 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
 358
 359 exit:
 360         nci_hci_send_data(ndev, pipe, status, NULL, 0);
 361
 362         kfree_skb(skb);
 363 }
 364
 365 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
 366                                   u8 result, struct sk_buff *skb)
 367 {
 368         struct nci_conn_info    *conn_info;
 369         u8 status = result;
 370
 371         conn_info = ndev->hci_dev->conn_info;
 372         if (!conn_info) {
 373                 status = NCI_STATUS_REJECTED;
 374                 goto exit;
 375         }
 376
 377         conn_info->rx_skb = skb;
 378
 379 exit:
 380         nci_req_complete(ndev, NCI_STATUS_OK);
 381 }
 382
 383 /* Receive hcp message for pipe, with type and cmd.
 384  * skb contains optional message data only.
 385  */
 386 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
 387                                    u8 type, u8 instruction, struct sk_buff *skb)
 388 {
 389         switch (type) {
 390         case NCI_HCI_HCP_RESPONSE:
 391                 nci_hci_resp_received(ndev, pipe, instruction, skb);
 392                 break;
 393         case NCI_HCI_HCP_COMMAND:
 394                 nci_hci_cmd_received(ndev, pipe, instruction, skb);
 395                 break;
 396         case NCI_HCI_HCP_EVENT:
 397                 nci_hci_event_received(ndev, pipe, instruction, skb);
 398                 break;
 399         default:
 400                 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
 401                        type, instruction);
 402                 kfree_skb(skb);
 403                 break;
 404         }
 405
 406         nci_req_complete(ndev, NCI_STATUS_OK);
 407 }
 408
 409 static void nci_hci_msg_rx_work(struct work_struct *work)
 410 {
 411         struct nci_hci_dev *hdev =
 412                 container_of(work, struct nci_hci_dev, msg_rx_work);
 413         struct sk_buff *skb;
 414         struct nci_hcp_message *message;
 415         u8 pipe, type, instruction;
 416
 417         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 418                 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
 419                 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 420                 message = (struct nci_hcp_message *)skb->data;
 421                 type = NCI_HCP_MSG_GET_TYPE(message->header);
 422                 instruction = NCI_HCP_MSG_GET_CMD(message->header);
 423                 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 424
 425                 nci_hci_hcp_message_rx(hdev->ndev, pipe,
 426                                        type, instruction, skb);
 427         }
 428 }
 429
 430 void nci_hci_data_received_cb(void *context,
 431                               struct sk_buff *skb, int err)
 432 {
 433         struct nci_dev *ndev = (struct nci_dev *)context;
 434         struct nci_hcp_packet *packet;
 435         u8 pipe, type;
 436         struct sk_buff *hcp_skb;
 437         struct sk_buff *frag_skb;
 438         int msg_len;
 439
 440         pr_debug("\n");
 441
 442         if (err) {
 443                 nci_req_complete(ndev, err);
 444                 return;
 445         }
 446
 447         packet = (struct nci_hcp_packet *)skb->data;
 448         if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
 449                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 450                 return;
 451         }
 452
 453         /* it's the last fragment. Does it need re-aggregation? */
 454         if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
 455                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 456                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 457
 458                 msg_len = 0;
 459                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 460                         msg_len += (frag_skb->len -
 461                                     NCI_HCI_HCP_PACKET_HEADER_LEN);
 462                 }
 463
 464                 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
 465                                              msg_len, GFP_KERNEL);
 466                 if (!hcp_skb) {
 467                         nci_req_complete(ndev, -ENOMEM);
 468                         return;
 469                 }
 470
 471                 skb_put_u8(hcp_skb, pipe);
 472
 473                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 474                         msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
 475                         skb_put_data(hcp_skb,
 476                                      frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
 477                                      msg_len);
 478                 }
 479
 480                 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
 481         } else {
 482                 packet->header &= NCI_HCI_FRAGMENT;
 483                 hcp_skb = skb;
 484         }
 485
 486         /* if this is a response, dispatch immediately to
 487          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 488          * in separate context where handler can also execute command.
 489          */
 490         packet = (struct nci_hcp_packet *)hcp_skb->data;
 491         type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
 492         if (type == NCI_HCI_HCP_RESPONSE) {
 493                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 494                 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 495                 nci_hci_hcp_message_rx(ndev, pipe, type,
 496                                        NCI_STATUS_OK, hcp_skb);
 497         } else {
 498                 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
 499                 schedule_work(&ndev->hci_dev->msg_rx_work);
 500         }
 501 }
 502
 503 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 504 {
 505         struct nci_data data;
 506         struct nci_conn_info    *conn_info;
 507
 508         conn_info = ndev->hci_dev->conn_info;
 509         if (!conn_info)
 510                 return -EPROTO;
 511
 512         data.conn_id = conn_info->conn_id;
 513         data.pipe = pipe;
 514         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 515                                        NCI_HCI_ANY_OPEN_PIPE);
 516         data.data = NULL;
 517         data.data_len = 0;
 518
 519         return nci_request(ndev, nci_hci_send_data_req,
 520                         (unsigned long)&data,
 521                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 522 }
 523 EXPORT_SYMBOL(nci_hci_open_pipe);
 524
 525 static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 526                               u8 dest_gate, int *result)
 527 {
 528         u8 pipe;
 529         struct sk_buff *skb;
 530         struct nci_hci_create_pipe_params params;
 531         struct nci_hci_create_pipe_resp *resp;
 532
 533         pr_debug("gate=%d\n", dest_gate);
 534
 535         params.src_gate = NCI_HCI_ADMIN_GATE;
 536         params.dest_host = dest_host;
 537         params.dest_gate = dest_gate;
 538
 539         *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 540                                    NCI_HCI_ADM_CREATE_PIPE,
 541                                    (u8 *)&params, sizeof(params), &skb);
 542         if (*result < 0)
 543                 return NCI_HCI_INVALID_PIPE;
 544
 545         resp = (struct nci_hci_create_pipe_resp *)skb->data;
 546         pipe = resp->pipe;
 547         kfree_skb(skb);
 548
 549         pr_debug("pipe created=%d\n", pipe);
 550
 551         return pipe;
 552 }
 553
 554 static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
 555 {
 556         pr_debug("\n");
 557
 558         return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 559                                 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
 560 }
 561
 562 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 563                       const u8 *param, size_t param_len)
 564 {
 565         struct nci_hcp_message *message;
 566         struct nci_conn_info *conn_info;
 567         struct nci_data data;
 568         int r;
 569         u8 *tmp;
 570         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 571
 572         pr_debug("idx=%d to gate %d\n", idx, gate);
 573
 574         if (pipe == NCI_HCI_INVALID_PIPE)
 575                 return -EADDRNOTAVAIL;
 576
 577         conn_info = ndev->hci_dev->conn_info;
 578         if (!conn_info)
 579                 return -EPROTO;
 580
 581         tmp = kmalloc(1 + param_len, GFP_KERNEL);
 582         if (!tmp)
 583                 return -ENOMEM;
 584
 585         *tmp = idx;
 586         memcpy(tmp + 1, param, param_len);
 587
 588         data.conn_id = conn_info->conn_id;
 589         data.pipe = pipe;
 590         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 591                                        NCI_HCI_ANY_SET_PARAMETER);
 592         data.data = tmp;
 593         data.data_len = param_len + 1;
 594
 595         r = nci_request(ndev, nci_hci_send_data_req,
 596                         (unsigned long)&data,
 597                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 598         if (r == NCI_STATUS_OK) {
 599                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 600                 r = nci_hci_result_to_errno(
 601                         NCI_HCP_MSG_GET_CMD(message->header));
 602                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 603         }
 604
 605         kfree(tmp);
 606         return r;
 607 }
 608 EXPORT_SYMBOL(nci_hci_set_param);
 609
 610 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 611                       struct sk_buff **skb)
 612 {
 613         struct nci_hcp_message *message;
 614         struct nci_conn_info    *conn_info;
 615         struct nci_data data;
 616         int r;
 617         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 618
 619         pr_debug("idx=%d to gate %d\n", idx, gate);
 620
 621         if (pipe == NCI_HCI_INVALID_PIPE)
 622                 return -EADDRNOTAVAIL;
 623
 624         conn_info = ndev->hci_dev->conn_info;
 625         if (!conn_info)
 626                 return -EPROTO;
 627
 628         data.conn_id = conn_info->conn_id;
 629         data.pipe = pipe;
 630         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 631                                   NCI_HCI_ANY_GET_PARAMETER);
 632         data.data = &idx;
 633         data.data_len = 1;
 634
 635         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 636                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 637
 638         if (r == NCI_STATUS_OK) {
 639                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 640                 r = nci_hci_result_to_errno(
 641                         NCI_HCP_MSG_GET_CMD(message->header));
 642                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 643
 644                 if (!r && skb)
 645                         *skb = conn_info->rx_skb;
 646         }
 647
 648         return r;
 649 }
 650 EXPORT_SYMBOL(nci_hci_get_param);
 651
 652 int nci_hci_connect_gate(struct nci_dev *ndev,
 653                          u8 dest_host, u8 dest_gate, u8 pipe)
 654 {
 655         bool pipe_created = false;
 656         int r;
 657
 658         if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
 659                 return 0;
 660
 661         if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
 662                 return -EADDRINUSE;
 663
 664         if (pipe != NCI_HCI_INVALID_PIPE)
 665                 goto open_pipe;
 666
 667         switch (dest_gate) {
 668         case NCI_HCI_LINK_MGMT_GATE:
 669                 pipe = NCI_HCI_LINK_MGMT_PIPE;
 670         break;
 671         case NCI_HCI_ADMIN_GATE:
 672                 pipe = NCI_HCI_ADMIN_PIPE;
 673         break;
 674         default:
 675                 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
 676                 if (pipe == NCI_HCI_INVALID_PIPE)
 677                         return r;
 678                 pipe_created = true;
 679                 break;
 680         }
 681
 682 open_pipe:
 683         r = nci_hci_open_pipe(ndev, pipe);
 684         if (r < 0) {
 685                 if (pipe_created) {
 686                         if (nci_hci_delete_pipe(ndev, pipe) < 0) {
 687                                 /* TODO: Cannot clean by deleting pipe...
 688                                  * -> inconsistent state
 689                                  */
 690                         }
 691                 }
 692                 return r;
 693         }
 694
 695         ndev->hci_dev->pipes[pipe].gate = dest_gate;
 696         ndev->hci_dev->pipes[pipe].host = dest_host;
 697         ndev->hci_dev->gate2pipe[dest_gate] = pipe;
 698
 699         return 0;
 700 }
 701 EXPORT_SYMBOL(nci_hci_connect_gate);
 702
 703 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 704                                      u8 gate_count,
 705                                      struct nci_hci_gate *gates)
 706 {
 707         int r;
 708
 709         while (gate_count--) {
 710                 r = nci_hci_connect_gate(ndev, gates->dest_host,
 711                                          gates->gate, gates->pipe);
 712                 if (r < 0)
 713                         return r;
 714                 gates++;
 715         }
 716
 717         return 0;
 718 }
 719
 720 int nci_hci_dev_session_init(struct nci_dev *ndev)
 721 {
 722         struct nci_conn_info    *conn_info;
 723         struct sk_buff *skb;
 724         int r;
 725
 726         ndev->hci_dev->count_pipes = 0;
 727         ndev->hci_dev->expected_pipes = 0;
 728
 729         conn_info = ndev->hci_dev->conn_info;
 730         if (!conn_info)
 731                 return -EPROTO;
 732
 733         conn_info->data_exchange_cb = nci_hci_data_received_cb;
 734         conn_info->data_exchange_cb_context = ndev;
 735
 736         nci_hci_reset_pipes(ndev->hci_dev);
 737
 738         if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
 739                 return -EPROTO;
 740
 741         r = nci_hci_connect_gate(ndev,
 742                                  ndev->hci_dev->init_data.gates[0].dest_host,
 743                                  ndev->hci_dev->init_data.gates[0].gate,
 744                                  ndev->hci_dev->init_data.gates[0].pipe);
 745         if (r < 0)
 746                 return r;
 747
 748         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 749                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 750         if (r < 0)
 751                 return r;
 752
 753         if (skb->len &&
 754             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
 755             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 756             ndev->ops->hci_load_session) {
 757                 /* Restore gate<->pipe table from some proprietary location. */
 758                 r = ndev->ops->hci_load_session(ndev);
 759         } else {
 760                 r = nci_hci_clear_all_pipes(ndev);
 761                 if (r < 0)
 762                         goto exit;
 763
 764                 r = nci_hci_dev_connect_gates(ndev,
 765                                               ndev->hci_dev->init_data.gate_count,
 766                                               ndev->hci_dev->init_data.gates);
 767                 if (r < 0)
 768                         goto exit;
 769
 770                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 771                                       NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
 772                                       ndev->hci_dev->init_data.session_id,
 773                                       strlen(ndev->hci_dev->init_data.session_id));
 774         }
 775
 776 exit:
 777         kfree_skb(skb);
 778
 779         return r;
 780 }
 781 EXPORT_SYMBOL(nci_hci_dev_session_init);
 782
 783 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
 784 {
 785         struct nci_hci_dev *hdev;
 786
 787         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 788         if (!hdev)
 789                 return NULL;
 790
 791         skb_queue_head_init(&hdev->rx_hcp_frags);
 792         INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
 793         skb_queue_head_init(&hdev->msg_rx_queue);
 794         hdev->ndev = ndev;
 795
 796         return hdev;
 797 }