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 *)¶ms, 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 } 795 796 void nci_hci_deallocate(struct nci_dev *ndev) 797 { 798 kfree(ndev->hci_dev); 799 } 800