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         const 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_ATOMIC);
 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                 /* If last packet add NCI_HFP_NO_CHAINING */
 165                 if (i + conn_info->max_pkt_payload_len -
 166                     (skb->len + 1) >= data_len) {
 167                         cb |= NCI_HFP_NO_CHAINING;
 168                         len = data_len - i;
 169                 } else {
 170                         len = conn_info->max_pkt_payload_len - skb->len - 1;
 171                 }
 172
 173                 *(u8 *)skb_push(skb, 1) = cb;
 174
 175                 if (len > 0)
 176                         skb_put_data(skb, data + i, len);
 177
 178                 r = nci_send_data(ndev, conn_info->conn_id, skb);
 179                 if (r < 0)
 180                         return r;
 181
 182                 i += len;
 183
 184                 if (i < data_len) {
 185                         skb = nci_skb_alloc(ndev,
 186                                             conn_info->max_pkt_payload_len +
 187                                             NCI_DATA_HDR_SIZE, GFP_ATOMIC);
 188                         if (!skb)
 189                                 return -ENOMEM;
 190
 191                         skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
 192                 }
 193         } while (i < data_len);
 194
 195         return i;
 196 }
 197
 198 static void nci_hci_send_data_req(struct nci_dev *ndev, const void *opt)
 199 {
 200         const struct nci_data *data = opt;
 201
 202         nci_hci_send_data(ndev, data->pipe, data->cmd,
 203                           data->data, data->data_len);
 204 }
 205
 206 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
 207                        const u8 *param, size_t param_len)
 208 {
 209         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 210
 211         if (pipe == NCI_HCI_INVALID_PIPE)
 212                 return -EADDRNOTAVAIL;
 213
 214         return nci_hci_send_data(ndev, pipe,
 215                         NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
 216                         param, param_len);
 217 }
 218 EXPORT_SYMBOL(nci_hci_send_event);
 219
 220 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 221                      const u8 *param, size_t param_len,
 222                      struct sk_buff **skb)
 223 {
 224         const struct nci_hcp_message *message;
 225         const struct nci_conn_info *conn_info;
 226         struct nci_data data;
 227         int r;
 228         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 229
 230         if (pipe == NCI_HCI_INVALID_PIPE)
 231                 return -EADDRNOTAVAIL;
 232
 233         conn_info = ndev->hci_dev->conn_info;
 234         if (!conn_info)
 235                 return -EPROTO;
 236
 237         data.conn_id = conn_info->conn_id;
 238         data.pipe = pipe;
 239         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
 240         data.data = param;
 241         data.data_len = param_len;
 242
 243         r = nci_request(ndev, nci_hci_send_data_req, &data,
 244                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 245         if (r == NCI_STATUS_OK) {
 246                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 247                 r = nci_hci_result_to_errno(
 248                         NCI_HCP_MSG_GET_CMD(message->header));
 249                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 250
 251                 if (!r && skb)
 252                         *skb = conn_info->rx_skb;
 253         }
 254
 255         return r;
 256 }
 257 EXPORT_SYMBOL(nci_hci_send_cmd);
 258
 259 int nci_hci_clear_all_pipes(struct nci_dev *ndev)
 260 {
 261         int r;
 262
 263         r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 264                              NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
 265         if (r < 0)
 266                 return r;
 267
 268         nci_hci_reset_pipes(ndev->hci_dev);
 269         return r;
 270 }
 271 EXPORT_SYMBOL(nci_hci_clear_all_pipes);
 272
 273 static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 274                                    u8 event, struct sk_buff *skb)
 275 {
 276         if (ndev->ops->hci_event_received)
 277                 ndev->ops->hci_event_received(ndev, pipe, event, skb);
 278 }
 279
 280 static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
 281                                  u8 cmd, struct sk_buff *skb)
 282 {
 283         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 284         u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
 285         u8 dest_gate, new_pipe;
 286         struct nci_hci_create_pipe_resp *create_info;
 287         struct nci_hci_delete_pipe_noti *delete_info;
 288         struct nci_hci_all_pipe_cleared_noti *cleared_info;
 289
 290         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
 291
 292         switch (cmd) {
 293         case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
 294                 if (skb->len != 5) {
 295                         status = NCI_HCI_ANY_E_NOK;
 296                         goto exit;
 297                 }
 298                 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
 299                 dest_gate = create_info->dest_gate;
 300                 new_pipe = create_info->pipe;
 301                 if (new_pipe >= NCI_HCI_MAX_PIPES) {
 302                         status = NCI_HCI_ANY_E_NOK;
 303                         goto exit;
 304                 }
 305
 306                 /* Save the new created pipe and bind with local gate,
 307                  * the description for skb->data[3] is destination gate id
 308                  * but since we received this cmd from host controller, we
 309                  * are the destination and it is our local gate
 310                  */
 311                 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
 312                 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
 313                 ndev->hci_dev->pipes[new_pipe].host =
 314                                                 create_info->src_host;
 315                 break;
 316         case NCI_HCI_ANY_OPEN_PIPE:
 317                 /* If the pipe is not created report an error */
 318                 if (gate == NCI_HCI_INVALID_GATE) {
 319                         status = NCI_HCI_ANY_E_NOK;
 320                         goto exit;
 321                 }
 322                 break;
 323         case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
 324                 if (skb->len != 1) {
 325                         status = NCI_HCI_ANY_E_NOK;
 326                         goto exit;
 327                 }
 328                 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
 329                 if (delete_info->pipe >= NCI_HCI_MAX_PIPES) {
 330                         status = NCI_HCI_ANY_E_NOK;
 331                         goto exit;
 332                 }
 333
 334                 ndev->hci_dev->pipes[delete_info->pipe].gate =
 335                                                 NCI_HCI_INVALID_GATE;
 336                 ndev->hci_dev->pipes[delete_info->pipe].host =
 337                                                 NCI_HCI_INVALID_HOST;
 338                 break;
 339         case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
 340                 if (skb->len != 1) {
 341                         status = NCI_HCI_ANY_E_NOK;
 342                         goto exit;
 343                 }
 344
 345                 cleared_info =
 346                         (struct nci_hci_all_pipe_cleared_noti *)skb->data;
 347                 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
 348                 break;
 349         default:
 350                 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
 351                 break;
 352         }
 353
 354         if (ndev->ops->hci_cmd_received)
 355                 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
 356
 357 exit:
 358         nci_hci_send_data(ndev, pipe, status, NULL, 0);
 359
 360         kfree_skb(skb);
 361 }
 362
 363 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
 364                                   struct sk_buff *skb)
 365 {
 366         struct nci_conn_info *conn_info;
 367
 368         conn_info = ndev->hci_dev->conn_info;
 369         if (!conn_info)
 370                 goto exit;
 371
 372         conn_info->rx_skb = skb;
 373
 374 exit:
 375         nci_req_complete(ndev, NCI_STATUS_OK);
 376 }
 377
 378 /* Receive hcp message for pipe, with type and cmd.
 379  * skb contains optional message data only.
 380  */
 381 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
 382                                    u8 type, u8 instruction, struct sk_buff *skb)
 383 {
 384         switch (type) {
 385         case NCI_HCI_HCP_RESPONSE:
 386                 nci_hci_resp_received(ndev, pipe, skb);
 387                 break;
 388         case NCI_HCI_HCP_COMMAND:
 389                 nci_hci_cmd_received(ndev, pipe, instruction, skb);
 390                 break;
 391         case NCI_HCI_HCP_EVENT:
 392                 nci_hci_event_received(ndev, pipe, instruction, skb);
 393                 break;
 394         default:
 395                 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
 396                        type, instruction);
 397                 kfree_skb(skb);
 398                 break;
 399         }
 400
 401         nci_req_complete(ndev, NCI_STATUS_OK);
 402 }
 403
 404 static void nci_hci_msg_rx_work(struct work_struct *work)
 405 {
 406         struct nci_hci_dev *hdev =
 407                 container_of(work, struct nci_hci_dev, msg_rx_work);
 408         struct sk_buff *skb;
 409         const struct nci_hcp_message *message;
 410         u8 pipe, type, instruction;
 411
 412         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
 413                 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
 414                 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 415                 message = (struct nci_hcp_message *)skb->data;
 416                 type = NCI_HCP_MSG_GET_TYPE(message->header);
 417                 instruction = NCI_HCP_MSG_GET_CMD(message->header);
 418                 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 419
 420                 nci_hci_hcp_message_rx(hdev->ndev, pipe,
 421                                        type, instruction, skb);
 422         }
 423 }
 424
 425 void nci_hci_data_received_cb(void *context,
 426                               struct sk_buff *skb, int err)
 427 {
 428         struct nci_dev *ndev = (struct nci_dev *)context;
 429         struct nci_hcp_packet *packet;
 430         u8 pipe, type;
 431         struct sk_buff *hcp_skb;
 432         struct sk_buff *frag_skb;
 433         int msg_len;
 434
 435         if (err) {
 436                 nci_req_complete(ndev, err);
 437                 return;
 438         }
 439
 440         packet = (struct nci_hcp_packet *)skb->data;
 441         if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
 442                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 443                 return;
 444         }
 445
 446         /* it's the last fragment. Does it need re-aggregation? */
 447         if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
 448                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 449                 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
 450
 451                 msg_len = 0;
 452                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 453                         msg_len += (frag_skb->len -
 454                                     NCI_HCI_HCP_PACKET_HEADER_LEN);
 455                 }
 456
 457                 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
 458                                              msg_len, GFP_KERNEL);
 459                 if (!hcp_skb) {
 460                         nci_req_complete(ndev, -ENOMEM);
 461                         return;
 462                 }
 463
 464                 skb_put_u8(hcp_skb, pipe);
 465
 466                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
 467                         msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
 468                         skb_put_data(hcp_skb,
 469                                      frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
 470                                      msg_len);
 471                 }
 472
 473                 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
 474         } else {
 475                 packet->header &= NCI_HCI_FRAGMENT;
 476                 hcp_skb = skb;
 477         }
 478
 479         /* if this is a response, dispatch immediately to
 480          * unblock waiting cmd context. Otherwise, enqueue to dispatch
 481          * in separate context where handler can also execute command.
 482          */
 483         packet = (struct nci_hcp_packet *)hcp_skb->data;
 484         type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
 485         if (type == NCI_HCI_HCP_RESPONSE) {
 486                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
 487                 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
 488                 nci_hci_hcp_message_rx(ndev, pipe, type,
 489                                        NCI_STATUS_OK, hcp_skb);
 490         } else {
 491                 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
 492                 schedule_work(&ndev->hci_dev->msg_rx_work);
 493         }
 494 }
 495
 496 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
 497 {
 498         struct nci_data data;
 499         const struct nci_conn_info *conn_info;
 500
 501         conn_info = ndev->hci_dev->conn_info;
 502         if (!conn_info)
 503                 return -EPROTO;
 504
 505         data.conn_id = conn_info->conn_id;
 506         data.pipe = pipe;
 507         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 508                                        NCI_HCI_ANY_OPEN_PIPE);
 509         data.data = NULL;
 510         data.data_len = 0;
 511
 512         return nci_request(ndev, nci_hci_send_data_req, &data,
 513                            msecs_to_jiffies(NCI_DATA_TIMEOUT));
 514 }
 515 EXPORT_SYMBOL(nci_hci_open_pipe);
 516
 517 static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 518                               u8 dest_gate, int *result)
 519 {
 520         u8 pipe;
 521         struct sk_buff *skb;
 522         struct nci_hci_create_pipe_params params;
 523         const struct nci_hci_create_pipe_resp *resp;
 524
 525         pr_debug("gate=%d\n", dest_gate);
 526
 527         params.src_gate = NCI_HCI_ADMIN_GATE;
 528         params.dest_host = dest_host;
 529         params.dest_gate = dest_gate;
 530
 531         *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 532                                    NCI_HCI_ADM_CREATE_PIPE,
 533                                    (u8 *)&params, sizeof(params), &skb);
 534         if (*result < 0)
 535                 return NCI_HCI_INVALID_PIPE;
 536
 537         resp = (struct nci_hci_create_pipe_resp *)skb->data;
 538         pipe = resp->pipe;
 539         kfree_skb(skb);
 540
 541         pr_debug("pipe created=%d\n", pipe);
 542
 543         return pipe;
 544 }
 545
 546 static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
 547 {
 548         return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
 549                                 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
 550 }
 551
 552 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
 553                       const u8 *param, size_t param_len)
 554 {
 555         const struct nci_hcp_message *message;
 556         const struct nci_conn_info *conn_info;
 557         struct nci_data data;
 558         int r;
 559         u8 *tmp;
 560         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 561
 562         pr_debug("idx=%d to gate %d\n", idx, gate);
 563
 564         if (pipe == NCI_HCI_INVALID_PIPE)
 565                 return -EADDRNOTAVAIL;
 566
 567         conn_info = ndev->hci_dev->conn_info;
 568         if (!conn_info)
 569                 return -EPROTO;
 570
 571         tmp = kmalloc(1 + param_len, GFP_KERNEL);
 572         if (!tmp)
 573                 return -ENOMEM;
 574
 575         *tmp = idx;
 576         memcpy(tmp + 1, param, param_len);
 577
 578         data.conn_id = conn_info->conn_id;
 579         data.pipe = pipe;
 580         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 581                                        NCI_HCI_ANY_SET_PARAMETER);
 582         data.data = tmp;
 583         data.data_len = param_len + 1;
 584
 585         r = nci_request(ndev, nci_hci_send_data_req, &data,
 586                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 587         if (r == NCI_STATUS_OK) {
 588                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 589                 r = nci_hci_result_to_errno(
 590                         NCI_HCP_MSG_GET_CMD(message->header));
 591                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 592         }
 593
 594         kfree(tmp);
 595         return r;
 596 }
 597 EXPORT_SYMBOL(nci_hci_set_param);
 598
 599 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
 600                       struct sk_buff **skb)
 601 {
 602         const struct nci_hcp_message *message;
 603         const struct nci_conn_info *conn_info;
 604         struct nci_data data;
 605         int r;
 606         u8 pipe = ndev->hci_dev->gate2pipe[gate];
 607
 608         pr_debug("idx=%d to gate %d\n", idx, gate);
 609
 610         if (pipe == NCI_HCI_INVALID_PIPE)
 611                 return -EADDRNOTAVAIL;
 612
 613         conn_info = ndev->hci_dev->conn_info;
 614         if (!conn_info)
 615                 return -EPROTO;
 616
 617         data.conn_id = conn_info->conn_id;
 618         data.pipe = pipe;
 619         data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
 620                                   NCI_HCI_ANY_GET_PARAMETER);
 621         data.data = &idx;
 622         data.data_len = 1;
 623
 624         r = nci_request(ndev, nci_hci_send_data_req, &data,
 625                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
 626
 627         if (r == NCI_STATUS_OK) {
 628                 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
 629                 r = nci_hci_result_to_errno(
 630                         NCI_HCP_MSG_GET_CMD(message->header));
 631                 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
 632
 633                 if (!r && skb)
 634                         *skb = conn_info->rx_skb;
 635         }
 636
 637         return r;
 638 }
 639 EXPORT_SYMBOL(nci_hci_get_param);
 640
 641 int nci_hci_connect_gate(struct nci_dev *ndev,
 642                          u8 dest_host, u8 dest_gate, u8 pipe)
 643 {
 644         bool pipe_created = false;
 645         int r;
 646
 647         if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
 648                 return 0;
 649
 650         if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
 651                 return -EADDRINUSE;
 652
 653         if (pipe != NCI_HCI_INVALID_PIPE)
 654                 goto open_pipe;
 655
 656         switch (dest_gate) {
 657         case NCI_HCI_LINK_MGMT_GATE:
 658                 pipe = NCI_HCI_LINK_MGMT_PIPE;
 659         break;
 660         case NCI_HCI_ADMIN_GATE:
 661                 pipe = NCI_HCI_ADMIN_PIPE;
 662         break;
 663         default:
 664                 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
 665                 if (pipe == NCI_HCI_INVALID_PIPE)
 666                         return r;
 667                 pipe_created = true;
 668                 break;
 669         }
 670
 671 open_pipe:
 672         r = nci_hci_open_pipe(ndev, pipe);
 673         if (r < 0) {
 674                 if (pipe_created) {
 675                         if (nci_hci_delete_pipe(ndev, pipe) < 0) {
 676                                 /* TODO: Cannot clean by deleting pipe...
 677                                  * -> inconsistent state
 678                                  */
 679                         }
 680                 }
 681                 return r;
 682         }
 683
 684         ndev->hci_dev->pipes[pipe].gate = dest_gate;
 685         ndev->hci_dev->pipes[pipe].host = dest_host;
 686         ndev->hci_dev->gate2pipe[dest_gate] = pipe;
 687
 688         return 0;
 689 }
 690 EXPORT_SYMBOL(nci_hci_connect_gate);
 691
 692 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
 693                                      u8 gate_count,
 694                                      const struct nci_hci_gate *gates)
 695 {
 696         int r;
 697
 698         while (gate_count--) {
 699                 r = nci_hci_connect_gate(ndev, gates->dest_host,
 700                                          gates->gate, gates->pipe);
 701                 if (r < 0)
 702                         return r;
 703                 gates++;
 704         }
 705
 706         return 0;
 707 }
 708
 709 int nci_hci_dev_session_init(struct nci_dev *ndev)
 710 {
 711         struct nci_conn_info *conn_info;
 712         struct sk_buff *skb;
 713         int r;
 714
 715         ndev->hci_dev->count_pipes = 0;
 716         ndev->hci_dev->expected_pipes = 0;
 717
 718         conn_info = ndev->hci_dev->conn_info;
 719         if (!conn_info)
 720                 return -EPROTO;
 721
 722         conn_info->data_exchange_cb = nci_hci_data_received_cb;
 723         conn_info->data_exchange_cb_context = ndev;
 724
 725         nci_hci_reset_pipes(ndev->hci_dev);
 726
 727         if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
 728                 return -EPROTO;
 729
 730         r = nci_hci_connect_gate(ndev,
 731                                  ndev->hci_dev->init_data.gates[0].dest_host,
 732                                  ndev->hci_dev->init_data.gates[0].gate,
 733                                  ndev->hci_dev->init_data.gates[0].pipe);
 734         if (r < 0)
 735                 return r;
 736
 737         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 738                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 739         if (r < 0)
 740                 return r;
 741
 742         if (skb->len &&
 743             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
 744             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 745             ndev->ops->hci_load_session) {
 746                 /* Restore gate<->pipe table from some proprietary location. */
 747                 r = ndev->ops->hci_load_session(ndev);
 748         } else {
 749                 r = nci_hci_clear_all_pipes(ndev);
 750                 if (r < 0)
 751                         goto exit;
 752
 753                 r = nci_hci_dev_connect_gates(ndev,
 754                                               ndev->hci_dev->init_data.gate_count,
 755                                               ndev->hci_dev->init_data.gates);
 756                 if (r < 0)
 757                         goto exit;
 758
 759                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 760                                       NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
 761                                       ndev->hci_dev->init_data.session_id,
 762                                       strlen(ndev->hci_dev->init_data.session_id));
 763         }
 764
 765 exit:
 766         kfree_skb(skb);
 767
 768         return r;
 769 }
 770 EXPORT_SYMBOL(nci_hci_dev_session_init);
 771
 772 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
 773 {
 774         struct nci_hci_dev *hdev;
 775
 776         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
 777         if (!hdev)
 778                 return NULL;
 779
 780         skb_queue_head_init(&hdev->rx_hcp_frags);
 781         INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
 782         skb_queue_head_init(&hdev->msg_rx_queue);
 783         hdev->ndev = ndev;
 784
 785         return hdev;
 786 }
 787
 788 void nci_hci_deallocate(struct nci_dev *ndev)
 789 {
 790         kfree(ndev->hci_dev);
 791 }