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_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 /* 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_KERNEL); 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 *)¶ms, 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 } 792