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                                   struct sk_buff *skb)
 367 {
 368         struct nci_conn_info    *conn_info;
 369
 370         conn_info = ndev->hci_dev->conn_info;
 371         if (!conn_info)
 372                 goto exit;
 373
 374         conn_info->rx_skb = skb;
 375
 376 exit:
 377         nci_req_complete(ndev, NCI_STATUS_OK);
 378 }
 379
 380 /* Receive hcp message for pipe, with type and cmd.
 381  * skb contains optional message data only.
 382  */
 383 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
 384                                    u8 type, u8 instruction, struct sk_buff *skb)
 385 {
 386         switch (type) {
 387         case NCI_HCI_HCP_RESPONSE:
 388                 nci_hci_resp_received(ndev, pipe, skb);
 389                 break;
 390         case NCI_HCI_HCP_COMMAND:
 391                 nci_hci_cmd_received(ndev, pipe, instruction, skb);
 392                 break;
 393         case NCI_HCI_HCP_EVENT:
 394                 nci_hci_event_received(ndev, pipe, instruction, skb);
 395                 break;
 396         default:
 397                 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
 398                        type, instruction);
 399                 kfree_skb(skb);
 400                 break;
 401         }
 402
 403         nci_req_complete(ndev, NCI_STATUS_OK);
 404 }
 405
 406 static void nci_hci_msg_rx_work(struct work_struct *work)
 407 {
 408         struct nci_hci_dev *hdev =
 409                 container_of(work, struct nci_hci_dev, msg_rx_work);
 410         struct sk_buff *skb;
 411         struct nci_hcp_message *message;
 412         u8 pipe, type, instruction;
 413
 414         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 415                 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
 416                 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 417                 message = (struct nci_hcp_message *)skb->data;
 418                 type = NCI_HCP_MSG_GET_TYPE(message->header);
 419                 instruction = NCI_HCP_MSG_GET_CMD(message->header);
 420                 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 421
 422                 nci_hci_hcp_message_rx(hdev->ndev, pipe,
 423                                        type, instruction, skb);
 424         }
 425 }
 426
 427 void nci_hci_data_received_cb(void *context,
 428                               struct sk_buff *skb, int err)
 429 {
 430         struct nci_dev *ndev = (struct nci_dev *)context;
 431         struct nci_hcp_packet *packet;
 432         u8 pipe, type;
 433         struct sk_buff *hcp_skb;
 434         struct sk_buff *frag_skb;
 435         int msg_len;
 436
 437         pr_debug("\n");
 438
 439         if (err) {
 440                 nci_req_complete(ndev, err);
 441                 return;
 442         }
 443
 444         packet = (struct nci_hcp_packet *)skb->data;
 445         if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
 446                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 447                 return;
 448         }
 449
 450         /* it's the last fragment. Does it need re-aggregation? */
 451         if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
 452                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 453                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 454
 455                 msg_len = 0;
 456                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 457                         msg_len += (frag_skb->len -
 458                                     NCI_HCI_HCP_PACKET_HEADER_LEN);
 459                 }
 460
 461                 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
 462                                              msg_len, GFP_KERNEL);
 463                 if (!hcp_skb) {
 464                         nci_req_complete(ndev, -ENOMEM);
 465                         return;
 466                 }
 467
 468                 skb_put_u8(hcp_skb, pipe);
 469
 470                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 471                         msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
 472                         skb_put_data(hcp_skb,
 473                                      frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
 474                                      msg_len);
 475                 }
 476
 477                 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
 478         } else {
 479                 packet->header &= NCI_HCI_FRAGMENT;
 480                 hcp_skb = skb;
 481         }
 482
 483         /* if this is a response, dispatch immediately to
 484          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 485          * in separate context where handler can also execute command.
 486          */
 487         packet = (struct nci_hcp_packet *)hcp_skb->data;
 488         type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
 489         if (type == NCI_HCI_HCP_RESPONSE) {
 490                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 491                 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 492                 nci_hci_hcp_message_rx(ndev, pipe, type,
 493                                        NCI_STATUS_OK, hcp_skb);
 494         } else {
 495                 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
 496                 schedule_work(&ndev->hci_dev->msg_rx_work);
 497         }
 498 }
 499
 500 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 501 {
 502         struct nci_data data;
 503         struct nci_conn_info    *conn_info;
 504
 505         conn_info = ndev->hci_dev->conn_info;
 506         if (!conn_info)
 507                 return -EPROTO;
 508
 509         data.conn_id = conn_info->conn_id;
 510         data.pipe = pipe;
 511         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 512                                        NCI_HCI_ANY_OPEN_PIPE);
 513         data.data = NULL;
 514         data.data_len = 0;
 515
 516         return nci_request(ndev, nci_hci_send_data_req,
 517                         (unsigned long)&data,
 518                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 519 }
 520 EXPORT_SYMBOL(nci_hci_open_pipe);
 521
 522 static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 523                               u8 dest_gate, int *result)
 524 {
 525         u8 pipe;
 526         struct sk_buff *skb;
 527         struct nci_hci_create_pipe_params params;
 528         struct nci_hci_create_pipe_resp *resp;
 529
 530         pr_debug("gate=%d\n", dest_gate);
 531
 532         params.src_gate = NCI_HCI_ADMIN_GATE;
 533         params.dest_host = dest_host;
 534         params.dest_gate = dest_gate;
 535
 536         *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 537                                    NCI_HCI_ADM_CREATE_PIPE,
 538                                    (u8 *)&params, sizeof(params), &skb);
 539         if (*result < 0)
 540                 return NCI_HCI_INVALID_PIPE;
 541
 542         resp = (struct nci_hci_create_pipe_resp *)skb->data;
 543         pipe = resp->pipe;
 544         kfree_skb(skb);
 545
 546         pr_debug("pipe created=%d\n", pipe);
 547
 548         return pipe;
 549 }
 550
 551 static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
 552 {
 553         pr_debug("\n");
 554
 555         return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 556                                 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
 557 }
 558
 559 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 560                       const u8 *param, size_t param_len)
 561 {
 562         struct nci_hcp_message *message;
 563         struct nci_conn_info *conn_info;
 564         struct nci_data data;
 565         int r;
 566         u8 *tmp;
 567         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 568
 569         pr_debug("idx=%d to gate %d\n", idx, gate);
 570
 571         if (pipe == NCI_HCI_INVALID_PIPE)
 572                 return -EADDRNOTAVAIL;
 573
 574         conn_info = ndev->hci_dev->conn_info;
 575         if (!conn_info)
 576                 return -EPROTO;
 577
 578         tmp = kmalloc(1 + param_len, GFP_KERNEL);
 579         if (!tmp)
 580                 return -ENOMEM;
 581
 582         *tmp = idx;
 583         memcpy(tmp + 1, param, param_len);
 584
 585         data.conn_id = conn_info->conn_id;
 586         data.pipe = pipe;
 587         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 588                                        NCI_HCI_ANY_SET_PARAMETER);
 589         data.data = tmp;
 590         data.data_len = param_len + 1;
 591
 592         r = nci_request(ndev, nci_hci_send_data_req,
 593                         (unsigned long)&data,
 594                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 595         if (r == NCI_STATUS_OK) {
 596                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 597                 r = nci_hci_result_to_errno(
 598                         NCI_HCP_MSG_GET_CMD(message->header));
 599                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 600         }
 601
 602         kfree(tmp);
 603         return r;
 604 }
 605 EXPORT_SYMBOL(nci_hci_set_param);
 606
 607 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 608                       struct sk_buff **skb)
 609 {
 610         struct nci_hcp_message *message;
 611         struct nci_conn_info    *conn_info;
 612         struct nci_data data;
 613         int r;
 614         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 615
 616         pr_debug("idx=%d to gate %d\n", idx, gate);
 617
 618         if (pipe == NCI_HCI_INVALID_PIPE)
 619                 return -EADDRNOTAVAIL;
 620
 621         conn_info = ndev->hci_dev->conn_info;
 622         if (!conn_info)
 623                 return -EPROTO;
 624
 625         data.conn_id = conn_info->conn_id;
 626         data.pipe = pipe;
 627         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 628                                   NCI_HCI_ANY_GET_PARAMETER);
 629         data.data = &idx;
 630         data.data_len = 1;
 631
 632         r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 633                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 634
 635         if (r == NCI_STATUS_OK) {
 636                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 637                 r = nci_hci_result_to_errno(
 638                         NCI_HCP_MSG_GET_CMD(message->header));
 639                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 640
 641                 if (!r && skb)
 642                         *skb = conn_info->rx_skb;
 643         }
 644
 645         return r;
 646 }
 647 EXPORT_SYMBOL(nci_hci_get_param);
 648
 649 int nci_hci_connect_gate(struct nci_dev *ndev,
 650                          u8 dest_host, u8 dest_gate, u8 pipe)
 651 {
 652         bool pipe_created = false;
 653         int r;
 654
 655         if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
 656                 return 0;
 657
 658         if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
 659                 return -EADDRINUSE;
 660
 661         if (pipe != NCI_HCI_INVALID_PIPE)
 662                 goto open_pipe;
 663
 664         switch (dest_gate) {
 665         case NCI_HCI_LINK_MGMT_GATE:
 666                 pipe = NCI_HCI_LINK_MGMT_PIPE;
 667         break;
 668         case NCI_HCI_ADMIN_GATE:
 669                 pipe = NCI_HCI_ADMIN_PIPE;
 670         break;
 671         default:
 672                 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
 673                 if (pipe == NCI_HCI_INVALID_PIPE)
 674                         return r;
 675                 pipe_created = true;
 676                 break;
 677         }
 678
 679 open_pipe:
 680         r = nci_hci_open_pipe(ndev, pipe);
 681         if (r < 0) {
 682                 if (pipe_created) {
 683                         if (nci_hci_delete_pipe(ndev, pipe) < 0) {
 684                                 /* TODO: Cannot clean by deleting pipe...
 685                                  * -> inconsistent state
 686                                  */
 687                         }
 688                 }
 689                 return r;
 690         }
 691
 692         ndev->hci_dev->pipes[pipe].gate = dest_gate;
 693         ndev->hci_dev->pipes[pipe].host = dest_host;
 694         ndev->hci_dev->gate2pipe[dest_gate] = pipe;
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL(nci_hci_connect_gate);
 699
 700 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 701                                      u8 gate_count,
 702                                      struct nci_hci_gate *gates)
 703 {
 704         int r;
 705
 706         while (gate_count--) {
 707                 r = nci_hci_connect_gate(ndev, gates->dest_host,
 708                                          gates->gate, gates->pipe);
 709                 if (r < 0)
 710                         return r;
 711                 gates++;
 712         }
 713
 714         return 0;
 715 }
 716
 717 int nci_hci_dev_session_init(struct nci_dev *ndev)
 718 {
 719         struct nci_conn_info    *conn_info;
 720         struct sk_buff *skb;
 721         int r;
 722
 723         ndev->hci_dev->count_pipes = 0;
 724         ndev->hci_dev->expected_pipes = 0;
 725
 726         conn_info = ndev->hci_dev->conn_info;
 727         if (!conn_info)
 728                 return -EPROTO;
 729
 730         conn_info->data_exchange_cb = nci_hci_data_received_cb;
 731         conn_info->data_exchange_cb_context = ndev;
 732
 733         nci_hci_reset_pipes(ndev->hci_dev);
 734
 735         if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
 736                 return -EPROTO;
 737
 738         r = nci_hci_connect_gate(ndev,
 739                                  ndev->hci_dev->init_data.gates[0].dest_host,
 740                                  ndev->hci_dev->init_data.gates[0].gate,
 741                                  ndev->hci_dev->init_data.gates[0].pipe);
 742         if (r < 0)
 743                 return r;
 744
 745         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 746                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 747         if (r < 0)
 748                 return r;
 749
 750         if (skb->len &&
 751             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
 752             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 753             ndev->ops->hci_load_session) {
 754                 /* Restore gate<->pipe table from some proprietary location. */
 755                 r = ndev->ops->hci_load_session(ndev);
 756         } else {
 757                 r = nci_hci_clear_all_pipes(ndev);
 758                 if (r < 0)
 759                         goto exit;
 760
 761                 r = nci_hci_dev_connect_gates(ndev,
 762                                               ndev->hci_dev->init_data.gate_count,
 763                                               ndev->hci_dev->init_data.gates);
 764                 if (r < 0)
 765                         goto exit;
 766
 767                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 768                                       NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
 769                                       ndev->hci_dev->init_data.session_id,
 770                                       strlen(ndev->hci_dev->init_data.session_id));
 771         }
 772
 773 exit:
 774         kfree_skb(skb);
 775
 776         return r;
 777 }
 778 EXPORT_SYMBOL(nci_hci_dev_session_init);
 779
 780 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
 781 {
 782         struct nci_hci_dev *hdev;
 783
 784         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 785         if (!hdev)
 786                 return NULL;
 787
 788         skb_queue_head_init(&hdev->rx_hcp_frags);
 789         INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
 790         skb_queue_head_init(&hdev->msg_rx_queue);
 791         hdev->ndev = ndev;
 792
 793         return hdev;
 794 }