1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (C) 2000-2001 Qualcomm Incorporated 4 5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License version 2 as 9 published by the Free Software Foundation; 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 /* Bluetooth HCI sockets. */ 26 #include <linux/compat.h> 27 #include <linux/export.h> 28 #include <linux/utsname.h> 29 #include <linux/sched.h> 30 #include <asm/unaligned.h> 31 32 #include <net/bluetooth/bluetooth.h> 33 #include <net/bluetooth/hci_core.h> 34 #include <net/bluetooth/hci_mon.h> 35 #include <net/bluetooth/mgmt.h> 36 37 #include "mgmt_util.h" 38 39 static LIST_HEAD(mgmt_chan_list); 40 static DEFINE_MUTEX(mgmt_chan_list_lock); 41 42 static DEFINE_IDA(sock_cookie_ida); 43 44 static atomic_t monitor_promisc = ATOMIC_INIT(0); 45 46 /* ----- HCI socket interface ----- */ 47 48 /* Socket info */ 49 #define hci_pi(sk) ((struct hci_pinfo *) sk) 50 51 struct hci_pinfo { 52 struct bt_sock bt; 53 struct hci_dev *hdev; 54 struct hci_filter filter; 55 __u8 cmsg_mask; 56 unsigned short channel; 57 unsigned long flags; 58 __u32 cookie; 59 char comm[TASK_COMM_LEN]; 60 __u16 mtu; 61 }; 62 63 static struct hci_dev *hci_hdev_from_sock(struct sock *sk) 64 { 65 struct hci_dev *hdev = hci_pi(sk)->hdev; 66 67 if (!hdev) 68 return ERR_PTR(-EBADFD); 69 if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) 70 return ERR_PTR(-EPIPE); 71 return hdev; 72 } 73 74 void hci_sock_set_flag(struct sock *sk, int nr) 75 { 76 set_bit(nr, &hci_pi(sk)->flags); 77 } 78 79 void hci_sock_clear_flag(struct sock *sk, int nr) 80 { 81 clear_bit(nr, &hci_pi(sk)->flags); 82 } 83 84 int hci_sock_test_flag(struct sock *sk, int nr) 85 { 86 return test_bit(nr, &hci_pi(sk)->flags); 87 } 88 89 unsigned short hci_sock_get_channel(struct sock *sk) 90 { 91 return hci_pi(sk)->channel; 92 } 93 94 u32 hci_sock_get_cookie(struct sock *sk) 95 { 96 return hci_pi(sk)->cookie; 97 } 98 99 static bool hci_sock_gen_cookie(struct sock *sk) 100 { 101 int id = hci_pi(sk)->cookie; 102 103 if (!id) { 104 id = ida_alloc_min(&sock_cookie_ida, 1, GFP_KERNEL); 105 if (id < 0) 106 id = 0xffffffff; 107 108 hci_pi(sk)->cookie = id; 109 get_task_comm(hci_pi(sk)->comm, current); 110 return true; 111 } 112 113 return false; 114 } 115 116 static void hci_sock_free_cookie(struct sock *sk) 117 { 118 int id = hci_pi(sk)->cookie; 119 120 if (id) { 121 hci_pi(sk)->cookie = 0xffffffff; 122 ida_free(&sock_cookie_ida, id); 123 } 124 } 125 126 static inline int hci_test_bit(int nr, const void *addr) 127 { 128 return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31)); 129 } 130 131 /* Security filter */ 132 #define HCI_SFLT_MAX_OGF 5 133 134 struct hci_sec_filter { 135 __u32 type_mask; 136 __u32 event_mask[2]; 137 __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4]; 138 }; 139 140 static const struct hci_sec_filter hci_sec_filter = { 141 /* Packet types */ 142 0x10, 143 /* Events */ 144 { 0x1000d9fe, 0x0000b00c }, 145 /* Commands */ 146 { 147 { 0x0 }, 148 /* OGF_LINK_CTL */ 149 { 0xbe000006, 0x00000001, 0x00000000, 0x00 }, 150 /* OGF_LINK_POLICY */ 151 { 0x00005200, 0x00000000, 0x00000000, 0x00 }, 152 /* OGF_HOST_CTL */ 153 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 }, 154 /* OGF_INFO_PARAM */ 155 { 0x000002be, 0x00000000, 0x00000000, 0x00 }, 156 /* OGF_STATUS_PARAM */ 157 { 0x000000ea, 0x00000000, 0x00000000, 0x00 } 158 } 159 }; 160 161 static struct bt_sock_list hci_sk_list = { 162 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock) 163 }; 164 165 static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb) 166 { 167 struct hci_filter *flt; 168 int flt_type, flt_event; 169 170 /* Apply filter */ 171 flt = &hci_pi(sk)->filter; 172 173 flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS; 174 175 if (!test_bit(flt_type, &flt->type_mask)) 176 return true; 177 178 /* Extra filter for event packets only */ 179 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT) 180 return false; 181 182 flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS); 183 184 if (!hci_test_bit(flt_event, &flt->event_mask)) 185 return true; 186 187 /* Check filter only when opcode is set */ 188 if (!flt->opcode) 189 return false; 190 191 if (flt_event == HCI_EV_CMD_COMPLETE && 192 flt->opcode != get_unaligned((__le16 *)(skb->data + 3))) 193 return true; 194 195 if (flt_event == HCI_EV_CMD_STATUS && 196 flt->opcode != get_unaligned((__le16 *)(skb->data + 4))) 197 return true; 198 199 return false; 200 } 201 202 /* Send frame to RAW socket */ 203 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb) 204 { 205 struct sock *sk; 206 struct sk_buff *skb_copy = NULL; 207 208 BT_DBG("hdev %p len %d", hdev, skb->len); 209 210 read_lock(&hci_sk_list.lock); 211 212 sk_for_each(sk, &hci_sk_list.head) { 213 struct sk_buff *nskb; 214 215 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev) 216 continue; 217 218 /* Don't send frame to the socket it came from */ 219 if (skb->sk == sk) 220 continue; 221 222 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) { 223 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT && 224 hci_skb_pkt_type(skb) != HCI_EVENT_PKT && 225 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT && 226 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT && 227 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) 228 continue; 229 if (is_filtered_packet(sk, skb)) 230 continue; 231 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) { 232 if (!bt_cb(skb)->incoming) 233 continue; 234 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT && 235 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT && 236 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT && 237 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) 238 continue; 239 } else { 240 /* Don't send frame to other channel types */ 241 continue; 242 } 243 244 if (!skb_copy) { 245 /* Create a private copy with headroom */ 246 skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true); 247 if (!skb_copy) 248 continue; 249 250 /* Put type byte before the data */ 251 memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1); 252 } 253 254 nskb = skb_clone(skb_copy, GFP_ATOMIC); 255 if (!nskb) 256 continue; 257 258 if (sock_queue_rcv_skb(sk, nskb)) 259 kfree_skb(nskb); 260 } 261 262 read_unlock(&hci_sk_list.lock); 263 264 kfree_skb(skb_copy); 265 } 266 267 static void hci_sock_copy_creds(struct sock *sk, struct sk_buff *skb) 268 { 269 struct scm_creds *creds; 270 271 if (!sk || WARN_ON(!skb)) 272 return; 273 274 creds = &bt_cb(skb)->creds; 275 276 /* Check if peer credentials is set */ 277 if (!sk->sk_peer_pid) { 278 /* Check if parent peer credentials is set */ 279 if (bt_sk(sk)->parent && bt_sk(sk)->parent->sk_peer_pid) 280 sk = bt_sk(sk)->parent; 281 else 282 return; 283 } 284 285 /* Check if scm_creds already set */ 286 if (creds->pid == pid_vnr(sk->sk_peer_pid)) 287 return; 288 289 memset(creds, 0, sizeof(*creds)); 290 291 creds->pid = pid_vnr(sk->sk_peer_pid); 292 if (sk->sk_peer_cred) { 293 creds->uid = sk->sk_peer_cred->uid; 294 creds->gid = sk->sk_peer_cred->gid; 295 } 296 } 297 298 static struct sk_buff *hci_skb_clone(struct sk_buff *skb) 299 { 300 struct sk_buff *nskb; 301 302 if (!skb) 303 return NULL; 304 305 nskb = skb_clone(skb, GFP_ATOMIC); 306 if (!nskb) 307 return NULL; 308 309 hci_sock_copy_creds(skb->sk, nskb); 310 311 return nskb; 312 } 313 314 /* Send frame to sockets with specific channel */ 315 static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb, 316 int flag, struct sock *skip_sk) 317 { 318 struct sock *sk; 319 320 BT_DBG("channel %u len %d", channel, skb->len); 321 322 sk_for_each(sk, &hci_sk_list.head) { 323 struct sk_buff *nskb; 324 325 /* Ignore socket without the flag set */ 326 if (!hci_sock_test_flag(sk, flag)) 327 continue; 328 329 /* Skip the original socket */ 330 if (sk == skip_sk) 331 continue; 332 333 if (sk->sk_state != BT_BOUND) 334 continue; 335 336 if (hci_pi(sk)->channel != channel) 337 continue; 338 339 nskb = hci_skb_clone(skb); 340 if (!nskb) 341 continue; 342 343 if (sock_queue_rcv_skb(sk, nskb)) 344 kfree_skb(nskb); 345 } 346 347 } 348 349 void hci_send_to_channel(unsigned short channel, struct sk_buff *skb, 350 int flag, struct sock *skip_sk) 351 { 352 read_lock(&hci_sk_list.lock); 353 __hci_send_to_channel(channel, skb, flag, skip_sk); 354 read_unlock(&hci_sk_list.lock); 355 } 356 357 /* Send frame to monitor socket */ 358 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb) 359 { 360 struct sk_buff *skb_copy = NULL; 361 struct hci_mon_hdr *hdr; 362 __le16 opcode; 363 364 if (!atomic_read(&monitor_promisc)) 365 return; 366 367 BT_DBG("hdev %p len %d", hdev, skb->len); 368 369 switch (hci_skb_pkt_type(skb)) { 370 case HCI_COMMAND_PKT: 371 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT); 372 break; 373 case HCI_EVENT_PKT: 374 opcode = cpu_to_le16(HCI_MON_EVENT_PKT); 375 break; 376 case HCI_ACLDATA_PKT: 377 if (bt_cb(skb)->incoming) 378 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT); 379 else 380 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT); 381 break; 382 case HCI_SCODATA_PKT: 383 if (bt_cb(skb)->incoming) 384 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT); 385 else 386 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT); 387 break; 388 case HCI_ISODATA_PKT: 389 if (bt_cb(skb)->incoming) 390 opcode = cpu_to_le16(HCI_MON_ISO_RX_PKT); 391 else 392 opcode = cpu_to_le16(HCI_MON_ISO_TX_PKT); 393 break; 394 case HCI_DIAG_PKT: 395 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG); 396 break; 397 default: 398 return; 399 } 400 401 /* Create a private copy with headroom */ 402 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true); 403 if (!skb_copy) 404 return; 405 406 hci_sock_copy_creds(skb->sk, skb_copy); 407 408 /* Put header before the data */ 409 hdr = skb_push(skb_copy, HCI_MON_HDR_SIZE); 410 hdr->opcode = opcode; 411 hdr->index = cpu_to_le16(hdev->id); 412 hdr->len = cpu_to_le16(skb->len); 413 414 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy, 415 HCI_SOCK_TRUSTED, NULL); 416 kfree_skb(skb_copy); 417 } 418 419 void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event, 420 void *data, u16 data_len, ktime_t tstamp, 421 int flag, struct sock *skip_sk) 422 { 423 struct sock *sk; 424 __le16 index; 425 426 if (hdev) 427 index = cpu_to_le16(hdev->id); 428 else 429 index = cpu_to_le16(MGMT_INDEX_NONE); 430 431 read_lock(&hci_sk_list.lock); 432 433 sk_for_each(sk, &hci_sk_list.head) { 434 struct hci_mon_hdr *hdr; 435 struct sk_buff *skb; 436 437 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL) 438 continue; 439 440 /* Ignore socket without the flag set */ 441 if (!hci_sock_test_flag(sk, flag)) 442 continue; 443 444 /* Skip the original socket */ 445 if (sk == skip_sk) 446 continue; 447 448 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC); 449 if (!skb) 450 continue; 451 452 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4)); 453 put_unaligned_le16(event, skb_put(skb, 2)); 454 455 if (data) 456 skb_put_data(skb, data, data_len); 457 458 skb->tstamp = tstamp; 459 460 hdr = skb_push(skb, HCI_MON_HDR_SIZE); 461 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT); 462 hdr->index = index; 463 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 464 465 __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 466 HCI_SOCK_TRUSTED, NULL); 467 kfree_skb(skb); 468 } 469 470 read_unlock(&hci_sk_list.lock); 471 } 472 473 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event) 474 { 475 struct hci_mon_hdr *hdr; 476 struct hci_mon_new_index *ni; 477 struct hci_mon_index_info *ii; 478 struct sk_buff *skb; 479 __le16 opcode; 480 481 switch (event) { 482 case HCI_DEV_REG: 483 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC); 484 if (!skb) 485 return NULL; 486 487 ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE); 488 ni->type = 0x00; /* Old hdev->dev_type */ 489 ni->bus = hdev->bus; 490 bacpy(&ni->bdaddr, &hdev->bdaddr); 491 memcpy_and_pad(ni->name, sizeof(ni->name), hdev->name, 492 strnlen(hdev->name, sizeof(ni->name)), '\0'); 493 494 opcode = cpu_to_le16(HCI_MON_NEW_INDEX); 495 break; 496 497 case HCI_DEV_UNREG: 498 skb = bt_skb_alloc(0, GFP_ATOMIC); 499 if (!skb) 500 return NULL; 501 502 opcode = cpu_to_le16(HCI_MON_DEL_INDEX); 503 break; 504 505 case HCI_DEV_SETUP: 506 if (hdev->manufacturer == 0xffff) 507 return NULL; 508 fallthrough; 509 510 case HCI_DEV_UP: 511 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC); 512 if (!skb) 513 return NULL; 514 515 ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE); 516 bacpy(&ii->bdaddr, &hdev->bdaddr); 517 ii->manufacturer = cpu_to_le16(hdev->manufacturer); 518 519 opcode = cpu_to_le16(HCI_MON_INDEX_INFO); 520 break; 521 522 case HCI_DEV_OPEN: 523 skb = bt_skb_alloc(0, GFP_ATOMIC); 524 if (!skb) 525 return NULL; 526 527 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX); 528 break; 529 530 case HCI_DEV_CLOSE: 531 skb = bt_skb_alloc(0, GFP_ATOMIC); 532 if (!skb) 533 return NULL; 534 535 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX); 536 break; 537 538 default: 539 return NULL; 540 } 541 542 __net_timestamp(skb); 543 544 hdr = skb_push(skb, HCI_MON_HDR_SIZE); 545 hdr->opcode = opcode; 546 hdr->index = cpu_to_le16(hdev->id); 547 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 548 549 return skb; 550 } 551 552 static struct sk_buff *create_monitor_ctrl_open(struct sock *sk) 553 { 554 struct hci_mon_hdr *hdr; 555 struct sk_buff *skb; 556 u16 format; 557 u8 ver[3]; 558 u32 flags; 559 560 /* No message needed when cookie is not present */ 561 if (!hci_pi(sk)->cookie) 562 return NULL; 563 564 switch (hci_pi(sk)->channel) { 565 case HCI_CHANNEL_RAW: 566 format = 0x0000; 567 ver[0] = BT_SUBSYS_VERSION; 568 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1); 569 break; 570 case HCI_CHANNEL_USER: 571 format = 0x0001; 572 ver[0] = BT_SUBSYS_VERSION; 573 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1); 574 break; 575 case HCI_CHANNEL_CONTROL: 576 format = 0x0002; 577 mgmt_fill_version_info(ver); 578 break; 579 default: 580 /* No message for unsupported format */ 581 return NULL; 582 } 583 584 skb = bt_skb_alloc(14 + TASK_COMM_LEN, GFP_ATOMIC); 585 if (!skb) 586 return NULL; 587 588 hci_sock_copy_creds(sk, skb); 589 590 flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0; 591 592 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4)); 593 put_unaligned_le16(format, skb_put(skb, 2)); 594 skb_put_data(skb, ver, sizeof(ver)); 595 put_unaligned_le32(flags, skb_put(skb, 4)); 596 skb_put_u8(skb, TASK_COMM_LEN); 597 skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN); 598 599 __net_timestamp(skb); 600 601 hdr = skb_push(skb, HCI_MON_HDR_SIZE); 602 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN); 603 if (hci_pi(sk)->hdev) 604 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id); 605 else 606 hdr->index = cpu_to_le16(HCI_DEV_NONE); 607 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 608 609 return skb; 610 } 611 612 static struct sk_buff *create_monitor_ctrl_close(struct sock *sk) 613 { 614 struct hci_mon_hdr *hdr; 615 struct sk_buff *skb; 616 617 /* No message needed when cookie is not present */ 618 if (!hci_pi(sk)->cookie) 619 return NULL; 620 621 switch (hci_pi(sk)->channel) { 622 case HCI_CHANNEL_RAW: 623 case HCI_CHANNEL_USER: 624 case HCI_CHANNEL_CONTROL: 625 break; 626 default: 627 /* No message for unsupported format */ 628 return NULL; 629 } 630 631 skb = bt_skb_alloc(4, GFP_ATOMIC); 632 if (!skb) 633 return NULL; 634 635 hci_sock_copy_creds(sk, skb); 636 637 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4)); 638 639 __net_timestamp(skb); 640 641 hdr = skb_push(skb, HCI_MON_HDR_SIZE); 642 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE); 643 if (hci_pi(sk)->hdev) 644 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id); 645 else 646 hdr->index = cpu_to_le16(HCI_DEV_NONE); 647 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 648 649 return skb; 650 } 651 652 static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index, 653 u16 opcode, u16 len, 654 const void *buf) 655 { 656 struct hci_mon_hdr *hdr; 657 struct sk_buff *skb; 658 659 skb = bt_skb_alloc(6 + len, GFP_ATOMIC); 660 if (!skb) 661 return NULL; 662 663 hci_sock_copy_creds(sk, skb); 664 665 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4)); 666 put_unaligned_le16(opcode, skb_put(skb, 2)); 667 668 if (buf) 669 skb_put_data(skb, buf, len); 670 671 __net_timestamp(skb); 672 673 hdr = skb_push(skb, HCI_MON_HDR_SIZE); 674 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND); 675 hdr->index = cpu_to_le16(index); 676 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 677 678 return skb; 679 } 680 681 static void __printf(2, 3) 682 send_monitor_note(struct sock *sk, const char *fmt, ...) 683 { 684 size_t len; 685 struct hci_mon_hdr *hdr; 686 struct sk_buff *skb; 687 va_list args; 688 689 va_start(args, fmt); 690 len = vsnprintf(NULL, 0, fmt, args); 691 va_end(args); 692 693 skb = bt_skb_alloc(len + 1, GFP_ATOMIC); 694 if (!skb) 695 return; 696 697 hci_sock_copy_creds(sk, skb); 698 699 va_start(args, fmt); 700 vsprintf(skb_put(skb, len), fmt, args); 701 *(u8 *)skb_put(skb, 1) = 0; 702 va_end(args); 703 704 __net_timestamp(skb); 705 706 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE); 707 hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE); 708 hdr->index = cpu_to_le16(HCI_DEV_NONE); 709 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE); 710 711 if (sock_queue_rcv_skb(sk, skb)) 712 kfree_skb(skb); 713 } 714 715 static void send_monitor_replay(struct sock *sk) 716 { 717 struct hci_dev *hdev; 718 719 read_lock(&hci_dev_list_lock); 720 721 list_for_each_entry(hdev, &hci_dev_list, list) { 722 struct sk_buff *skb; 723 724 skb = create_monitor_event(hdev, HCI_DEV_REG); 725 if (!skb) 726 continue; 727 728 if (sock_queue_rcv_skb(sk, skb)) 729 kfree_skb(skb); 730 731 if (!test_bit(HCI_RUNNING, &hdev->flags)) 732 continue; 733 734 skb = create_monitor_event(hdev, HCI_DEV_OPEN); 735 if (!skb) 736 continue; 737 738 if (sock_queue_rcv_skb(sk, skb)) 739 kfree_skb(skb); 740 741 if (test_bit(HCI_UP, &hdev->flags)) 742 skb = create_monitor_event(hdev, HCI_DEV_UP); 743 else if (hci_dev_test_flag(hdev, HCI_SETUP)) 744 skb = create_monitor_event(hdev, HCI_DEV_SETUP); 745 else 746 skb = NULL; 747 748 if (skb) { 749 if (sock_queue_rcv_skb(sk, skb)) 750 kfree_skb(skb); 751 } 752 } 753 754 read_unlock(&hci_dev_list_lock); 755 } 756 757 static void send_monitor_control_replay(struct sock *mon_sk) 758 { 759 struct sock *sk; 760 761 read_lock(&hci_sk_list.lock); 762 763 sk_for_each(sk, &hci_sk_list.head) { 764 struct sk_buff *skb; 765 766 skb = create_monitor_ctrl_open(sk); 767 if (!skb) 768 continue; 769 770 if (sock_queue_rcv_skb(mon_sk, skb)) 771 kfree_skb(skb); 772 } 773 774 read_unlock(&hci_sk_list.lock); 775 } 776 777 /* Generate internal stack event */ 778 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data) 779 { 780 struct hci_event_hdr *hdr; 781 struct hci_ev_stack_internal *ev; 782 struct sk_buff *skb; 783 784 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC); 785 if (!skb) 786 return; 787 788 hdr = skb_put(skb, HCI_EVENT_HDR_SIZE); 789 hdr->evt = HCI_EV_STACK_INTERNAL; 790 hdr->plen = sizeof(*ev) + dlen; 791 792 ev = skb_put(skb, sizeof(*ev) + dlen); 793 ev->type = type; 794 memcpy(ev->data, data, dlen); 795 796 bt_cb(skb)->incoming = 1; 797 __net_timestamp(skb); 798 799 hci_skb_pkt_type(skb) = HCI_EVENT_PKT; 800 hci_send_to_sock(hdev, skb); 801 kfree_skb(skb); 802 } 803 804 void hci_sock_dev_event(struct hci_dev *hdev, int event) 805 { 806 BT_DBG("hdev %s event %d", hdev->name, event); 807 808 if (atomic_read(&monitor_promisc)) { 809 struct sk_buff *skb; 810 811 /* Send event to monitor */ 812 skb = create_monitor_event(hdev, event); 813 if (skb) { 814 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 815 HCI_SOCK_TRUSTED, NULL); 816 kfree_skb(skb); 817 } 818 } 819 820 if (event <= HCI_DEV_DOWN) { 821 struct hci_ev_si_device ev; 822 823 /* Send event to sockets */ 824 ev.event = event; 825 ev.dev_id = hdev->id; 826 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev); 827 } 828 829 if (event == HCI_DEV_UNREG) { 830 struct sock *sk; 831 832 /* Wake up sockets using this dead device */ 833 read_lock(&hci_sk_list.lock); 834 sk_for_each(sk, &hci_sk_list.head) { 835 if (hci_pi(sk)->hdev == hdev) { 836 sk->sk_err = EPIPE; 837 sk->sk_state_change(sk); 838 } 839 } 840 read_unlock(&hci_sk_list.lock); 841 } 842 } 843 844 static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel) 845 { 846 struct hci_mgmt_chan *c; 847 848 list_for_each_entry(c, &mgmt_chan_list, list) { 849 if (c->channel == channel) 850 return c; 851 } 852 853 return NULL; 854 } 855 856 static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel) 857 { 858 struct hci_mgmt_chan *c; 859 860 mutex_lock(&mgmt_chan_list_lock); 861 c = __hci_mgmt_chan_find(channel); 862 mutex_unlock(&mgmt_chan_list_lock); 863 864 return c; 865 } 866 867 int hci_mgmt_chan_register(struct hci_mgmt_chan *c) 868 { 869 if (c->channel < HCI_CHANNEL_CONTROL) 870 return -EINVAL; 871 872 mutex_lock(&mgmt_chan_list_lock); 873 if (__hci_mgmt_chan_find(c->channel)) { 874 mutex_unlock(&mgmt_chan_list_lock); 875 return -EALREADY; 876 } 877 878 list_add_tail(&c->list, &mgmt_chan_list); 879 880 mutex_unlock(&mgmt_chan_list_lock); 881 882 return 0; 883 } 884 EXPORT_SYMBOL(hci_mgmt_chan_register); 885 886 void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c) 887 { 888 mutex_lock(&mgmt_chan_list_lock); 889 list_del(&c->list); 890 mutex_unlock(&mgmt_chan_list_lock); 891 } 892 EXPORT_SYMBOL(hci_mgmt_chan_unregister); 893 894 static int hci_sock_release(struct socket *sock) 895 { 896 struct sock *sk = sock->sk; 897 struct hci_dev *hdev; 898 struct sk_buff *skb; 899 900 BT_DBG("sock %p sk %p", sock, sk); 901 902 if (!sk) 903 return 0; 904 905 lock_sock(sk); 906 907 switch (hci_pi(sk)->channel) { 908 case HCI_CHANNEL_MONITOR: 909 atomic_dec(&monitor_promisc); 910 break; 911 case HCI_CHANNEL_RAW: 912 case HCI_CHANNEL_USER: 913 case HCI_CHANNEL_CONTROL: 914 /* Send event to monitor */ 915 skb = create_monitor_ctrl_close(sk); 916 if (skb) { 917 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 918 HCI_SOCK_TRUSTED, NULL); 919 kfree_skb(skb); 920 } 921 922 hci_sock_free_cookie(sk); 923 break; 924 } 925 926 bt_sock_unlink(&hci_sk_list, sk); 927 928 hdev = hci_pi(sk)->hdev; 929 if (hdev) { 930 if (hci_pi(sk)->channel == HCI_CHANNEL_USER && 931 !hci_dev_test_flag(hdev, HCI_UNREGISTER)) { 932 /* When releasing a user channel exclusive access, 933 * call hci_dev_do_close directly instead of calling 934 * hci_dev_close to ensure the exclusive access will 935 * be released and the controller brought back down. 936 * 937 * The checking of HCI_AUTO_OFF is not needed in this 938 * case since it will have been cleared already when 939 * opening the user channel. 940 * 941 * Make sure to also check that we haven't already 942 * unregistered since all the cleanup will have already 943 * been complete and hdev will get released when we put 944 * below. 945 */ 946 hci_dev_do_close(hdev); 947 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL); 948 mgmt_index_added(hdev); 949 } 950 951 atomic_dec(&hdev->promisc); 952 hci_dev_put(hdev); 953 } 954 955 sock_orphan(sk); 956 release_sock(sk); 957 sock_put(sk); 958 return 0; 959 } 960 961 static int hci_sock_reject_list_add(struct hci_dev *hdev, void __user *arg) 962 { 963 bdaddr_t bdaddr; 964 int err; 965 966 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr))) 967 return -EFAULT; 968 969 hci_dev_lock(hdev); 970 971 err = hci_bdaddr_list_add(&hdev->reject_list, &bdaddr, BDADDR_BREDR); 972 973 hci_dev_unlock(hdev); 974 975 return err; 976 } 977 978 static int hci_sock_reject_list_del(struct hci_dev *hdev, void __user *arg) 979 { 980 bdaddr_t bdaddr; 981 int err; 982 983 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr))) 984 return -EFAULT; 985 986 hci_dev_lock(hdev); 987 988 err = hci_bdaddr_list_del(&hdev->reject_list, &bdaddr, BDADDR_BREDR); 989 990 hci_dev_unlock(hdev); 991 992 return err; 993 } 994 995 /* Ioctls that require bound socket */ 996 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, 997 unsigned long arg) 998 { 999 struct hci_dev *hdev = hci_hdev_from_sock(sk); 1000 1001 if (IS_ERR(hdev)) 1002 return PTR_ERR(hdev); 1003 1004 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) 1005 return -EBUSY; 1006 1007 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) 1008 return -EOPNOTSUPP; 1009 1010 switch (cmd) { 1011 case HCISETRAW: 1012 if (!capable(CAP_NET_ADMIN)) 1013 return -EPERM; 1014 return -EOPNOTSUPP; 1015 1016 case HCIGETCONNINFO: 1017 return hci_get_conn_info(hdev, (void __user *)arg); 1018 1019 case HCIGETAUTHINFO: 1020 return hci_get_auth_info(hdev, (void __user *)arg); 1021 1022 case HCIBLOCKADDR: 1023 if (!capable(CAP_NET_ADMIN)) 1024 return -EPERM; 1025 return hci_sock_reject_list_add(hdev, (void __user *)arg); 1026 1027 case HCIUNBLOCKADDR: 1028 if (!capable(CAP_NET_ADMIN)) 1029 return -EPERM; 1030 return hci_sock_reject_list_del(hdev, (void __user *)arg); 1031 } 1032 1033 return -ENOIOCTLCMD; 1034 } 1035 1036 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, 1037 unsigned long arg) 1038 { 1039 void __user *argp = (void __user *)arg; 1040 struct sock *sk = sock->sk; 1041 int err; 1042 1043 BT_DBG("cmd %x arg %lx", cmd, arg); 1044 1045 /* Make sure the cmd is valid before doing anything */ 1046 switch (cmd) { 1047 case HCIGETDEVLIST: 1048 case HCIGETDEVINFO: 1049 case HCIGETCONNLIST: 1050 case HCIDEVUP: 1051 case HCIDEVDOWN: 1052 case HCIDEVRESET: 1053 case HCIDEVRESTAT: 1054 case HCISETSCAN: 1055 case HCISETAUTH: 1056 case HCISETENCRYPT: 1057 case HCISETPTYPE: 1058 case HCISETLINKPOL: 1059 case HCISETLINKMODE: 1060 case HCISETACLMTU: 1061 case HCISETSCOMTU: 1062 case HCIINQUIRY: 1063 case HCISETRAW: 1064 case HCIGETCONNINFO: 1065 case HCIGETAUTHINFO: 1066 case HCIBLOCKADDR: 1067 case HCIUNBLOCKADDR: 1068 break; 1069 default: 1070 return -ENOIOCTLCMD; 1071 } 1072 1073 lock_sock(sk); 1074 1075 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) { 1076 err = -EBADFD; 1077 goto done; 1078 } 1079 1080 /* When calling an ioctl on an unbound raw socket, then ensure 1081 * that the monitor gets informed. Ensure that the resulting event 1082 * is only send once by checking if the cookie exists or not. The 1083 * socket cookie will be only ever generated once for the lifetime 1084 * of a given socket. 1085 */ 1086 if (hci_sock_gen_cookie(sk)) { 1087 struct sk_buff *skb; 1088 1089 /* Perform careful checks before setting the HCI_SOCK_TRUSTED 1090 * flag. Make sure that not only the current task but also 1091 * the socket opener has the required capability, since 1092 * privileged programs can be tricked into making ioctl calls 1093 * on HCI sockets, and the socket should not be marked as 1094 * trusted simply because the ioctl caller is privileged. 1095 */ 1096 if (sk_capable(sk, CAP_NET_ADMIN)) 1097 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED); 1098 1099 /* Send event to monitor */ 1100 skb = create_monitor_ctrl_open(sk); 1101 if (skb) { 1102 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1103 HCI_SOCK_TRUSTED, NULL); 1104 kfree_skb(skb); 1105 } 1106 } 1107 1108 release_sock(sk); 1109 1110 switch (cmd) { 1111 case HCIGETDEVLIST: 1112 return hci_get_dev_list(argp); 1113 1114 case HCIGETDEVINFO: 1115 return hci_get_dev_info(argp); 1116 1117 case HCIGETCONNLIST: 1118 return hci_get_conn_list(argp); 1119 1120 case HCIDEVUP: 1121 if (!capable(CAP_NET_ADMIN)) 1122 return -EPERM; 1123 return hci_dev_open(arg); 1124 1125 case HCIDEVDOWN: 1126 if (!capable(CAP_NET_ADMIN)) 1127 return -EPERM; 1128 return hci_dev_close(arg); 1129 1130 case HCIDEVRESET: 1131 if (!capable(CAP_NET_ADMIN)) 1132 return -EPERM; 1133 return hci_dev_reset(arg); 1134 1135 case HCIDEVRESTAT: 1136 if (!capable(CAP_NET_ADMIN)) 1137 return -EPERM; 1138 return hci_dev_reset_stat(arg); 1139 1140 case HCISETSCAN: 1141 case HCISETAUTH: 1142 case HCISETENCRYPT: 1143 case HCISETPTYPE: 1144 case HCISETLINKPOL: 1145 case HCISETLINKMODE: 1146 case HCISETACLMTU: 1147 case HCISETSCOMTU: 1148 if (!capable(CAP_NET_ADMIN)) 1149 return -EPERM; 1150 return hci_dev_cmd(cmd, argp); 1151 1152 case HCIINQUIRY: 1153 return hci_inquiry(argp); 1154 } 1155 1156 lock_sock(sk); 1157 1158 err = hci_sock_bound_ioctl(sk, cmd, arg); 1159 1160 done: 1161 release_sock(sk); 1162 return err; 1163 } 1164 1165 #ifdef CONFIG_COMPAT 1166 static int hci_sock_compat_ioctl(struct socket *sock, unsigned int cmd, 1167 unsigned long arg) 1168 { 1169 switch (cmd) { 1170 case HCIDEVUP: 1171 case HCIDEVDOWN: 1172 case HCIDEVRESET: 1173 case HCIDEVRESTAT: 1174 return hci_sock_ioctl(sock, cmd, arg); 1175 } 1176 1177 return hci_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); 1178 } 1179 #endif 1180 1181 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, 1182 int addr_len) 1183 { 1184 struct sockaddr_hci haddr; 1185 struct sock *sk = sock->sk; 1186 struct hci_dev *hdev = NULL; 1187 struct sk_buff *skb; 1188 int len, err = 0; 1189 1190 BT_DBG("sock %p sk %p", sock, sk); 1191 1192 if (!addr) 1193 return -EINVAL; 1194 1195 memset(&haddr, 0, sizeof(haddr)); 1196 len = min_t(unsigned int, sizeof(haddr), addr_len); 1197 memcpy(&haddr, addr, len); 1198 1199 if (haddr.hci_family != AF_BLUETOOTH) 1200 return -EINVAL; 1201 1202 lock_sock(sk); 1203 1204 /* Allow detaching from dead device and attaching to alive device, if 1205 * the caller wants to re-bind (instead of close) this socket in 1206 * response to hci_sock_dev_event(HCI_DEV_UNREG) notification. 1207 */ 1208 hdev = hci_pi(sk)->hdev; 1209 if (hdev && hci_dev_test_flag(hdev, HCI_UNREGISTER)) { 1210 hci_pi(sk)->hdev = NULL; 1211 sk->sk_state = BT_OPEN; 1212 hci_dev_put(hdev); 1213 } 1214 hdev = NULL; 1215 1216 if (sk->sk_state == BT_BOUND) { 1217 err = -EALREADY; 1218 goto done; 1219 } 1220 1221 switch (haddr.hci_channel) { 1222 case HCI_CHANNEL_RAW: 1223 if (hci_pi(sk)->hdev) { 1224 err = -EALREADY; 1225 goto done; 1226 } 1227 1228 if (haddr.hci_dev != HCI_DEV_NONE) { 1229 hdev = hci_dev_get(haddr.hci_dev); 1230 if (!hdev) { 1231 err = -ENODEV; 1232 goto done; 1233 } 1234 1235 atomic_inc(&hdev->promisc); 1236 } 1237 1238 hci_pi(sk)->channel = haddr.hci_channel; 1239 1240 if (!hci_sock_gen_cookie(sk)) { 1241 /* In the case when a cookie has already been assigned, 1242 * then there has been already an ioctl issued against 1243 * an unbound socket and with that triggered an open 1244 * notification. Send a close notification first to 1245 * allow the state transition to bounded. 1246 */ 1247 skb = create_monitor_ctrl_close(sk); 1248 if (skb) { 1249 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1250 HCI_SOCK_TRUSTED, NULL); 1251 kfree_skb(skb); 1252 } 1253 } 1254 1255 if (capable(CAP_NET_ADMIN)) 1256 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED); 1257 1258 hci_pi(sk)->hdev = hdev; 1259 1260 /* Send event to monitor */ 1261 skb = create_monitor_ctrl_open(sk); 1262 if (skb) { 1263 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1264 HCI_SOCK_TRUSTED, NULL); 1265 kfree_skb(skb); 1266 } 1267 break; 1268 1269 case HCI_CHANNEL_USER: 1270 if (hci_pi(sk)->hdev) { 1271 err = -EALREADY; 1272 goto done; 1273 } 1274 1275 if (haddr.hci_dev == HCI_DEV_NONE) { 1276 err = -EINVAL; 1277 goto done; 1278 } 1279 1280 if (!capable(CAP_NET_ADMIN)) { 1281 err = -EPERM; 1282 goto done; 1283 } 1284 1285 hdev = hci_dev_get(haddr.hci_dev); 1286 if (!hdev) { 1287 err = -ENODEV; 1288 goto done; 1289 } 1290 1291 if (test_bit(HCI_INIT, &hdev->flags) || 1292 hci_dev_test_flag(hdev, HCI_SETUP) || 1293 hci_dev_test_flag(hdev, HCI_CONFIG) || 1294 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) && 1295 test_bit(HCI_UP, &hdev->flags))) { 1296 err = -EBUSY; 1297 hci_dev_put(hdev); 1298 goto done; 1299 } 1300 1301 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) { 1302 err = -EUSERS; 1303 hci_dev_put(hdev); 1304 goto done; 1305 } 1306 1307 mgmt_index_removed(hdev); 1308 1309 err = hci_dev_open(hdev->id); 1310 if (err) { 1311 if (err == -EALREADY) { 1312 /* In case the transport is already up and 1313 * running, clear the error here. 1314 * 1315 * This can happen when opening a user 1316 * channel and HCI_AUTO_OFF grace period 1317 * is still active. 1318 */ 1319 err = 0; 1320 } else { 1321 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL); 1322 mgmt_index_added(hdev); 1323 hci_dev_put(hdev); 1324 goto done; 1325 } 1326 } 1327 1328 hci_pi(sk)->channel = haddr.hci_channel; 1329 1330 if (!hci_sock_gen_cookie(sk)) { 1331 /* In the case when a cookie has already been assigned, 1332 * this socket will transition from a raw socket into 1333 * a user channel socket. For a clean transition, send 1334 * the close notification first. 1335 */ 1336 skb = create_monitor_ctrl_close(sk); 1337 if (skb) { 1338 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1339 HCI_SOCK_TRUSTED, NULL); 1340 kfree_skb(skb); 1341 } 1342 } 1343 1344 /* The user channel is restricted to CAP_NET_ADMIN 1345 * capabilities and with that implicitly trusted. 1346 */ 1347 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED); 1348 1349 hci_pi(sk)->hdev = hdev; 1350 1351 /* Send event to monitor */ 1352 skb = create_monitor_ctrl_open(sk); 1353 if (skb) { 1354 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1355 HCI_SOCK_TRUSTED, NULL); 1356 kfree_skb(skb); 1357 } 1358 1359 atomic_inc(&hdev->promisc); 1360 break; 1361 1362 case HCI_CHANNEL_MONITOR: 1363 if (haddr.hci_dev != HCI_DEV_NONE) { 1364 err = -EINVAL; 1365 goto done; 1366 } 1367 1368 if (!capable(CAP_NET_RAW)) { 1369 err = -EPERM; 1370 goto done; 1371 } 1372 1373 hci_pi(sk)->channel = haddr.hci_channel; 1374 1375 /* The monitor interface is restricted to CAP_NET_RAW 1376 * capabilities and with that implicitly trusted. 1377 */ 1378 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED); 1379 1380 send_monitor_note(sk, "Linux version %s (%s)", 1381 init_utsname()->release, 1382 init_utsname()->machine); 1383 send_monitor_note(sk, "Bluetooth subsystem version %u.%u", 1384 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION); 1385 send_monitor_replay(sk); 1386 send_monitor_control_replay(sk); 1387 1388 atomic_inc(&monitor_promisc); 1389 break; 1390 1391 case HCI_CHANNEL_LOGGING: 1392 if (haddr.hci_dev != HCI_DEV_NONE) { 1393 err = -EINVAL; 1394 goto done; 1395 } 1396 1397 if (!capable(CAP_NET_ADMIN)) { 1398 err = -EPERM; 1399 goto done; 1400 } 1401 1402 hci_pi(sk)->channel = haddr.hci_channel; 1403 break; 1404 1405 default: 1406 if (!hci_mgmt_chan_find(haddr.hci_channel)) { 1407 err = -EINVAL; 1408 goto done; 1409 } 1410 1411 if (haddr.hci_dev != HCI_DEV_NONE) { 1412 err = -EINVAL; 1413 goto done; 1414 } 1415 1416 /* Users with CAP_NET_ADMIN capabilities are allowed 1417 * access to all management commands and events. For 1418 * untrusted users the interface is restricted and 1419 * also only untrusted events are sent. 1420 */ 1421 if (capable(CAP_NET_ADMIN)) 1422 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED); 1423 1424 hci_pi(sk)->channel = haddr.hci_channel; 1425 1426 /* At the moment the index and unconfigured index events 1427 * are enabled unconditionally. Setting them on each 1428 * socket when binding keeps this functionality. They 1429 * however might be cleared later and then sending of these 1430 * events will be disabled, but that is then intentional. 1431 * 1432 * This also enables generic events that are safe to be 1433 * received by untrusted users. Example for such events 1434 * are changes to settings, class of device, name etc. 1435 */ 1436 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) { 1437 if (!hci_sock_gen_cookie(sk)) { 1438 /* In the case when a cookie has already been 1439 * assigned, this socket will transition from 1440 * a raw socket into a control socket. To 1441 * allow for a clean transition, send the 1442 * close notification first. 1443 */ 1444 skb = create_monitor_ctrl_close(sk); 1445 if (skb) { 1446 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1447 HCI_SOCK_TRUSTED, NULL); 1448 kfree_skb(skb); 1449 } 1450 } 1451 1452 /* Send event to monitor */ 1453 skb = create_monitor_ctrl_open(sk); 1454 if (skb) { 1455 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, 1456 HCI_SOCK_TRUSTED, NULL); 1457 kfree_skb(skb); 1458 } 1459 1460 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS); 1461 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS); 1462 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS); 1463 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS); 1464 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS); 1465 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS); 1466 } 1467 break; 1468 } 1469 1470 /* Default MTU to HCI_MAX_FRAME_SIZE if not set */ 1471 if (!hci_pi(sk)->mtu) 1472 hci_pi(sk)->mtu = HCI_MAX_FRAME_SIZE; 1473 1474 sk->sk_state = BT_BOUND; 1475 1476 done: 1477 release_sock(sk); 1478 return err; 1479 } 1480 1481 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, 1482 int peer) 1483 { 1484 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr; 1485 struct sock *sk = sock->sk; 1486 struct hci_dev *hdev; 1487 int err = 0; 1488 1489 BT_DBG("sock %p sk %p", sock, sk); 1490 1491 if (peer) 1492 return -EOPNOTSUPP; 1493 1494 lock_sock(sk); 1495 1496 hdev = hci_hdev_from_sock(sk); 1497 if (IS_ERR(hdev)) { 1498 err = PTR_ERR(hdev); 1499 goto done; 1500 } 1501 1502 haddr->hci_family = AF_BLUETOOTH; 1503 haddr->hci_dev = hdev->id; 1504 haddr->hci_channel= hci_pi(sk)->channel; 1505 err = sizeof(*haddr); 1506 1507 done: 1508 release_sock(sk); 1509 return err; 1510 } 1511 1512 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg, 1513 struct sk_buff *skb) 1514 { 1515 __u8 mask = hci_pi(sk)->cmsg_mask; 1516 1517 if (mask & HCI_CMSG_DIR) { 1518 int incoming = bt_cb(skb)->incoming; 1519 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming), 1520 &incoming); 1521 } 1522 1523 if (mask & HCI_CMSG_TSTAMP) { 1524 #ifdef CONFIG_COMPAT 1525 struct old_timeval32 ctv; 1526 #endif 1527 struct __kernel_old_timeval tv; 1528 void *data; 1529 int len; 1530 1531 skb_get_timestamp(skb, &tv); 1532 1533 data = &tv; 1534 len = sizeof(tv); 1535 #ifdef CONFIG_COMPAT 1536 if (!COMPAT_USE_64BIT_TIME && 1537 (msg->msg_flags & MSG_CMSG_COMPAT)) { 1538 ctv.tv_sec = tv.tv_sec; 1539 ctv.tv_usec = tv.tv_usec; 1540 data = &ctv; 1541 len = sizeof(ctv); 1542 } 1543 #endif 1544 1545 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data); 1546 } 1547 } 1548 1549 static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1550 size_t len, int flags) 1551 { 1552 struct scm_cookie scm; 1553 struct sock *sk = sock->sk; 1554 struct sk_buff *skb; 1555 int copied, err; 1556 unsigned int skblen; 1557 1558 BT_DBG("sock %p, sk %p", sock, sk); 1559 1560 if (flags & MSG_OOB) 1561 return -EOPNOTSUPP; 1562 1563 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING) 1564 return -EOPNOTSUPP; 1565 1566 if (sk->sk_state == BT_CLOSED) 1567 return 0; 1568 1569 skb = skb_recv_datagram(sk, flags, &err); 1570 if (!skb) 1571 return err; 1572 1573 skblen = skb->len; 1574 copied = skb->len; 1575 if (len < copied) { 1576 msg->msg_flags |= MSG_TRUNC; 1577 copied = len; 1578 } 1579 1580 skb_reset_transport_header(skb); 1581 err = skb_copy_datagram_msg(skb, 0, msg, copied); 1582 1583 switch (hci_pi(sk)->channel) { 1584 case HCI_CHANNEL_RAW: 1585 hci_sock_cmsg(sk, msg, skb); 1586 break; 1587 case HCI_CHANNEL_USER: 1588 case HCI_CHANNEL_MONITOR: 1589 sock_recv_timestamp(msg, sk, skb); 1590 break; 1591 default: 1592 if (hci_mgmt_chan_find(hci_pi(sk)->channel)) 1593 sock_recv_timestamp(msg, sk, skb); 1594 break; 1595 } 1596 1597 memset(&scm, 0, sizeof(scm)); 1598 scm.creds = bt_cb(skb)->creds; 1599 1600 skb_free_datagram(sk, skb); 1601 1602 if (flags & MSG_TRUNC) 1603 copied = skblen; 1604 1605 scm_recv(sock, msg, &scm, flags); 1606 1607 return err ? : copied; 1608 } 1609 1610 static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, 1611 struct sk_buff *skb) 1612 { 1613 u8 *cp; 1614 struct mgmt_hdr *hdr; 1615 u16 opcode, index, len; 1616 struct hci_dev *hdev = NULL; 1617 const struct hci_mgmt_handler *handler; 1618 bool var_len, no_hdev; 1619 int err; 1620 1621 BT_DBG("got %d bytes", skb->len); 1622 1623 if (skb->len < sizeof(*hdr)) 1624 return -EINVAL; 1625 1626 hdr = (void *)skb->data; 1627 opcode = __le16_to_cpu(hdr->opcode); 1628 index = __le16_to_cpu(hdr->index); 1629 len = __le16_to_cpu(hdr->len); 1630 1631 if (len != skb->len - sizeof(*hdr)) { 1632 err = -EINVAL; 1633 goto done; 1634 } 1635 1636 if (chan->channel == HCI_CHANNEL_CONTROL) { 1637 struct sk_buff *cmd; 1638 1639 /* Send event to monitor */ 1640 cmd = create_monitor_ctrl_command(sk, index, opcode, len, 1641 skb->data + sizeof(*hdr)); 1642 if (cmd) { 1643 hci_send_to_channel(HCI_CHANNEL_MONITOR, cmd, 1644 HCI_SOCK_TRUSTED, NULL); 1645 kfree_skb(cmd); 1646 } 1647 } 1648 1649 if (opcode >= chan->handler_count || 1650 chan->handlers[opcode].func == NULL) { 1651 BT_DBG("Unknown op %u", opcode); 1652 err = mgmt_cmd_status(sk, index, opcode, 1653 MGMT_STATUS_UNKNOWN_COMMAND); 1654 goto done; 1655 } 1656 1657 handler = &chan->handlers[opcode]; 1658 1659 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) && 1660 !(handler->flags & HCI_MGMT_UNTRUSTED)) { 1661 err = mgmt_cmd_status(sk, index, opcode, 1662 MGMT_STATUS_PERMISSION_DENIED); 1663 goto done; 1664 } 1665 1666 if (index != MGMT_INDEX_NONE) { 1667 hdev = hci_dev_get(index); 1668 if (!hdev) { 1669 err = mgmt_cmd_status(sk, index, opcode, 1670 MGMT_STATUS_INVALID_INDEX); 1671 goto done; 1672 } 1673 1674 if (hci_dev_test_flag(hdev, HCI_SETUP) || 1675 hci_dev_test_flag(hdev, HCI_CONFIG) || 1676 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) { 1677 err = mgmt_cmd_status(sk, index, opcode, 1678 MGMT_STATUS_INVALID_INDEX); 1679 goto done; 1680 } 1681 1682 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) && 1683 !(handler->flags & HCI_MGMT_UNCONFIGURED)) { 1684 err = mgmt_cmd_status(sk, index, opcode, 1685 MGMT_STATUS_INVALID_INDEX); 1686 goto done; 1687 } 1688 } 1689 1690 if (!(handler->flags & HCI_MGMT_HDEV_OPTIONAL)) { 1691 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV); 1692 if (no_hdev != !hdev) { 1693 err = mgmt_cmd_status(sk, index, opcode, 1694 MGMT_STATUS_INVALID_INDEX); 1695 goto done; 1696 } 1697 } 1698 1699 var_len = (handler->flags & HCI_MGMT_VAR_LEN); 1700 if ((var_len && len < handler->data_len) || 1701 (!var_len && len != handler->data_len)) { 1702 err = mgmt_cmd_status(sk, index, opcode, 1703 MGMT_STATUS_INVALID_PARAMS); 1704 goto done; 1705 } 1706 1707 if (hdev && chan->hdev_init) 1708 chan->hdev_init(sk, hdev); 1709 1710 cp = skb->data + sizeof(*hdr); 1711 1712 err = handler->func(sk, hdev, cp, len); 1713 if (err < 0) 1714 goto done; 1715 1716 err = skb->len; 1717 1718 done: 1719 if (hdev) 1720 hci_dev_put(hdev); 1721 1722 return err; 1723 } 1724 1725 static int hci_logging_frame(struct sock *sk, struct sk_buff *skb, 1726 unsigned int flags) 1727 { 1728 struct hci_mon_hdr *hdr; 1729 struct hci_dev *hdev; 1730 u16 index; 1731 int err; 1732 1733 /* The logging frame consists at minimum of the standard header, 1734 * the priority byte, the ident length byte and at least one string 1735 * terminator NUL byte. Anything shorter are invalid packets. 1736 */ 1737 if (skb->len < sizeof(*hdr) + 3) 1738 return -EINVAL; 1739 1740 hdr = (void *)skb->data; 1741 1742 if (__le16_to_cpu(hdr->len) != skb->len - sizeof(*hdr)) 1743 return -EINVAL; 1744 1745 if (__le16_to_cpu(hdr->opcode) == 0x0000) { 1746 __u8 priority = skb->data[sizeof(*hdr)]; 1747 __u8 ident_len = skb->data[sizeof(*hdr) + 1]; 1748 1749 /* Only the priorities 0-7 are valid and with that any other 1750 * value results in an invalid packet. 1751 * 1752 * The priority byte is followed by an ident length byte and 1753 * the NUL terminated ident string. Check that the ident 1754 * length is not overflowing the packet and also that the 1755 * ident string itself is NUL terminated. In case the ident 1756 * length is zero, the length value actually doubles as NUL 1757 * terminator identifier. 1758 * 1759 * The message follows the ident string (if present) and 1760 * must be NUL terminated. Otherwise it is not a valid packet. 1761 */ 1762 if (priority > 7 || skb->data[skb->len - 1] != 0x00 || 1763 ident_len > skb->len - sizeof(*hdr) - 3 || 1764 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) 1765 return -EINVAL; 1766 } else { 1767 return -EINVAL; 1768 } 1769 1770 index = __le16_to_cpu(hdr->index); 1771 1772 if (index != MGMT_INDEX_NONE) { 1773 hdev = hci_dev_get(index); 1774 if (!hdev) 1775 return -ENODEV; 1776 } else { 1777 hdev = NULL; 1778 } 1779 1780 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING); 1781 1782 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL); 1783 err = skb->len; 1784 1785 if (hdev) 1786 hci_dev_put(hdev); 1787 1788 return err; 1789 } 1790 1791 static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1792 size_t len) 1793 { 1794 struct sock *sk = sock->sk; 1795 struct hci_mgmt_chan *chan; 1796 struct hci_dev *hdev; 1797 struct sk_buff *skb; 1798 int err; 1799 const unsigned int flags = msg->msg_flags; 1800 1801 BT_DBG("sock %p sk %p", sock, sk); 1802 1803 if (flags & MSG_OOB) 1804 return -EOPNOTSUPP; 1805 1806 if (flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL | MSG_ERRQUEUE | MSG_CMSG_COMPAT)) 1807 return -EINVAL; 1808 1809 if (len < 4 || len > hci_pi(sk)->mtu) 1810 return -EINVAL; 1811 1812 skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0); 1813 if (IS_ERR(skb)) 1814 return PTR_ERR(skb); 1815 1816 lock_sock(sk); 1817 1818 switch (hci_pi(sk)->channel) { 1819 case HCI_CHANNEL_RAW: 1820 case HCI_CHANNEL_USER: 1821 break; 1822 case HCI_CHANNEL_MONITOR: 1823 err = -EOPNOTSUPP; 1824 goto drop; 1825 case HCI_CHANNEL_LOGGING: 1826 err = hci_logging_frame(sk, skb, flags); 1827 goto drop; 1828 default: 1829 mutex_lock(&mgmt_chan_list_lock); 1830 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel); 1831 if (chan) 1832 err = hci_mgmt_cmd(chan, sk, skb); 1833 else 1834 err = -EINVAL; 1835 1836 mutex_unlock(&mgmt_chan_list_lock); 1837 goto drop; 1838 } 1839 1840 hdev = hci_hdev_from_sock(sk); 1841 if (IS_ERR(hdev)) { 1842 err = PTR_ERR(hdev); 1843 goto drop; 1844 } 1845 1846 if (!test_bit(HCI_UP, &hdev->flags)) { 1847 err = -ENETDOWN; 1848 goto drop; 1849 } 1850 1851 hci_skb_pkt_type(skb) = skb->data[0]; 1852 skb_pull(skb, 1); 1853 1854 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) { 1855 /* No permission check is needed for user channel 1856 * since that gets enforced when binding the socket. 1857 * 1858 * However check that the packet type is valid. 1859 */ 1860 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT && 1861 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT && 1862 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT && 1863 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) { 1864 err = -EINVAL; 1865 goto drop; 1866 } 1867 1868 skb_queue_tail(&hdev->raw_q, skb); 1869 queue_work(hdev->workqueue, &hdev->tx_work); 1870 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) { 1871 u16 opcode = get_unaligned_le16(skb->data); 1872 u16 ogf = hci_opcode_ogf(opcode); 1873 u16 ocf = hci_opcode_ocf(opcode); 1874 1875 if (((ogf > HCI_SFLT_MAX_OGF) || 1876 !hci_test_bit(ocf & HCI_FLT_OCF_BITS, 1877 &hci_sec_filter.ocf_mask[ogf])) && 1878 !capable(CAP_NET_RAW)) { 1879 err = -EPERM; 1880 goto drop; 1881 } 1882 1883 /* Since the opcode has already been extracted here, store 1884 * a copy of the value for later use by the drivers. 1885 */ 1886 hci_skb_opcode(skb) = opcode; 1887 1888 if (ogf == 0x3f) { 1889 skb_queue_tail(&hdev->raw_q, skb); 1890 queue_work(hdev->workqueue, &hdev->tx_work); 1891 } else { 1892 /* Stand-alone HCI commands must be flagged as 1893 * single-command requests. 1894 */ 1895 bt_cb(skb)->hci.req_flags |= HCI_REQ_START; 1896 1897 skb_queue_tail(&hdev->cmd_q, skb); 1898 queue_work(hdev->workqueue, &hdev->cmd_work); 1899 } 1900 } else { 1901 if (!capable(CAP_NET_RAW)) { 1902 err = -EPERM; 1903 goto drop; 1904 } 1905 1906 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT && 1907 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT && 1908 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) { 1909 err = -EINVAL; 1910 goto drop; 1911 } 1912 1913 skb_queue_tail(&hdev->raw_q, skb); 1914 queue_work(hdev->workqueue, &hdev->tx_work); 1915 } 1916 1917 err = len; 1918 1919 done: 1920 release_sock(sk); 1921 return err; 1922 1923 drop: 1924 kfree_skb(skb); 1925 goto done; 1926 } 1927 1928 static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname, 1929 sockptr_t optval, unsigned int len) 1930 { 1931 struct hci_ufilter uf = { .opcode = 0 }; 1932 struct sock *sk = sock->sk; 1933 int err = 0, opt = 0; 1934 1935 BT_DBG("sk %p, opt %d", sk, optname); 1936 1937 lock_sock(sk); 1938 1939 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) { 1940 err = -EBADFD; 1941 goto done; 1942 } 1943 1944 switch (optname) { 1945 case HCI_DATA_DIR: 1946 if (copy_from_sockptr(&opt, optval, sizeof(opt))) { 1947 err = -EFAULT; 1948 break; 1949 } 1950 1951 if (opt) 1952 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR; 1953 else 1954 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR; 1955 break; 1956 1957 case HCI_TIME_STAMP: 1958 if (copy_from_sockptr(&opt, optval, sizeof(opt))) { 1959 err = -EFAULT; 1960 break; 1961 } 1962 1963 if (opt) 1964 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP; 1965 else 1966 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP; 1967 break; 1968 1969 case HCI_FILTER: 1970 { 1971 struct hci_filter *f = &hci_pi(sk)->filter; 1972 1973 uf.type_mask = f->type_mask; 1974 uf.opcode = f->opcode; 1975 uf.event_mask[0] = *((u32 *) f->event_mask + 0); 1976 uf.event_mask[1] = *((u32 *) f->event_mask + 1); 1977 } 1978 1979 len = min_t(unsigned int, len, sizeof(uf)); 1980 if (copy_from_sockptr(&uf, optval, len)) { 1981 err = -EFAULT; 1982 break; 1983 } 1984 1985 if (!capable(CAP_NET_RAW)) { 1986 uf.type_mask &= hci_sec_filter.type_mask; 1987 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0); 1988 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1); 1989 } 1990 1991 { 1992 struct hci_filter *f = &hci_pi(sk)->filter; 1993 1994 f->type_mask = uf.type_mask; 1995 f->opcode = uf.opcode; 1996 *((u32 *) f->event_mask + 0) = uf.event_mask[0]; 1997 *((u32 *) f->event_mask + 1) = uf.event_mask[1]; 1998 } 1999 break; 2000 2001 default: 2002 err = -ENOPROTOOPT; 2003 break; 2004 } 2005 2006 done: 2007 release_sock(sk); 2008 return err; 2009 } 2010 2011 static int hci_sock_setsockopt(struct socket *sock, int level, int optname, 2012 sockptr_t optval, unsigned int len) 2013 { 2014 struct sock *sk = sock->sk; 2015 int err = 0; 2016 u16 opt; 2017 2018 BT_DBG("sk %p, opt %d", sk, optname); 2019 2020 if (level == SOL_HCI) 2021 return hci_sock_setsockopt_old(sock, level, optname, optval, 2022 len); 2023 2024 if (level != SOL_BLUETOOTH) 2025 return -ENOPROTOOPT; 2026 2027 lock_sock(sk); 2028 2029 switch (optname) { 2030 case BT_SNDMTU: 2031 case BT_RCVMTU: 2032 switch (hci_pi(sk)->channel) { 2033 /* Don't allow changing MTU for channels that are meant for HCI 2034 * traffic only. 2035 */ 2036 case HCI_CHANNEL_RAW: 2037 case HCI_CHANNEL_USER: 2038 err = -ENOPROTOOPT; 2039 goto done; 2040 } 2041 2042 if (copy_from_sockptr(&opt, optval, sizeof(opt))) { 2043 err = -EFAULT; 2044 break; 2045 } 2046 2047 hci_pi(sk)->mtu = opt; 2048 break; 2049 2050 default: 2051 err = -ENOPROTOOPT; 2052 break; 2053 } 2054 2055 done: 2056 release_sock(sk); 2057 return err; 2058 } 2059 2060 static int hci_sock_getsockopt_old(struct socket *sock, int level, int optname, 2061 char __user *optval, int __user *optlen) 2062 { 2063 struct hci_ufilter uf; 2064 struct sock *sk = sock->sk; 2065 int len, opt, err = 0; 2066 2067 BT_DBG("sk %p, opt %d", sk, optname); 2068 2069 if (get_user(len, optlen)) 2070 return -EFAULT; 2071 2072 lock_sock(sk); 2073 2074 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) { 2075 err = -EBADFD; 2076 goto done; 2077 } 2078 2079 switch (optname) { 2080 case HCI_DATA_DIR: 2081 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR) 2082 opt = 1; 2083 else 2084 opt = 0; 2085 2086 if (put_user(opt, optval)) 2087 err = -EFAULT; 2088 break; 2089 2090 case HCI_TIME_STAMP: 2091 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP) 2092 opt = 1; 2093 else 2094 opt = 0; 2095 2096 if (put_user(opt, optval)) 2097 err = -EFAULT; 2098 break; 2099 2100 case HCI_FILTER: 2101 { 2102 struct hci_filter *f = &hci_pi(sk)->filter; 2103 2104 memset(&uf, 0, sizeof(uf)); 2105 uf.type_mask = f->type_mask; 2106 uf.opcode = f->opcode; 2107 uf.event_mask[0] = *((u32 *) f->event_mask + 0); 2108 uf.event_mask[1] = *((u32 *) f->event_mask + 1); 2109 } 2110 2111 len = min_t(unsigned int, len, sizeof(uf)); 2112 if (copy_to_user(optval, &uf, len)) 2113 err = -EFAULT; 2114 break; 2115 2116 default: 2117 err = -ENOPROTOOPT; 2118 break; 2119 } 2120 2121 done: 2122 release_sock(sk); 2123 return err; 2124 } 2125 2126 static int hci_sock_getsockopt(struct socket *sock, int level, int optname, 2127 char __user *optval, int __user *optlen) 2128 { 2129 struct sock *sk = sock->sk; 2130 int err = 0; 2131 2132 BT_DBG("sk %p, opt %d", sk, optname); 2133 2134 if (level == SOL_HCI) 2135 return hci_sock_getsockopt_old(sock, level, optname, optval, 2136 optlen); 2137 2138 if (level != SOL_BLUETOOTH) 2139 return -ENOPROTOOPT; 2140 2141 lock_sock(sk); 2142 2143 switch (optname) { 2144 case BT_SNDMTU: 2145 case BT_RCVMTU: 2146 if (put_user(hci_pi(sk)->mtu, (u16 __user *)optval)) 2147 err = -EFAULT; 2148 break; 2149 2150 default: 2151 err = -ENOPROTOOPT; 2152 break; 2153 } 2154 2155 release_sock(sk); 2156 return err; 2157 } 2158 2159 static void hci_sock_destruct(struct sock *sk) 2160 { 2161 mgmt_cleanup(sk); 2162 skb_queue_purge(&sk->sk_receive_queue); 2163 skb_queue_purge(&sk->sk_write_queue); 2164 } 2165 2166 static const struct proto_ops hci_sock_ops = { 2167 .family = PF_BLUETOOTH, 2168 .owner = THIS_MODULE, 2169 .release = hci_sock_release, 2170 .bind = hci_sock_bind, 2171 .getname = hci_sock_getname, 2172 .sendmsg = hci_sock_sendmsg, 2173 .recvmsg = hci_sock_recvmsg, 2174 .ioctl = hci_sock_ioctl, 2175 #ifdef CONFIG_COMPAT 2176 .compat_ioctl = hci_sock_compat_ioctl, 2177 #endif 2178 .poll = datagram_poll, 2179 .listen = sock_no_listen, 2180 .shutdown = sock_no_shutdown, 2181 .setsockopt = hci_sock_setsockopt, 2182 .getsockopt = hci_sock_getsockopt, 2183 .connect = sock_no_connect, 2184 .socketpair = sock_no_socketpair, 2185 .accept = sock_no_accept, 2186 .mmap = sock_no_mmap 2187 }; 2188 2189 static struct proto hci_sk_proto = { 2190 .name = "HCI", 2191 .owner = THIS_MODULE, 2192 .obj_size = sizeof(struct hci_pinfo) 2193 }; 2194 2195 static int hci_sock_create(struct net *net, struct socket *sock, int protocol, 2196 int kern) 2197 { 2198 struct sock *sk; 2199 2200 BT_DBG("sock %p", sock); 2201 2202 if (sock->type != SOCK_RAW) 2203 return -ESOCKTNOSUPPORT; 2204 2205 sock->ops = &hci_sock_ops; 2206 2207 sk = bt_sock_alloc(net, sock, &hci_sk_proto, protocol, GFP_ATOMIC, 2208 kern); 2209 if (!sk) 2210 return -ENOMEM; 2211 2212 sock->state = SS_UNCONNECTED; 2213 sk->sk_destruct = hci_sock_destruct; 2214 2215 bt_sock_link(&hci_sk_list, sk); 2216 return 0; 2217 } 2218 2219 static const struct net_proto_family hci_sock_family_ops = { 2220 .family = PF_BLUETOOTH, 2221 .owner = THIS_MODULE, 2222 .create = hci_sock_create, 2223 }; 2224 2225 int __init hci_sock_init(void) 2226 { 2227 int err; 2228 2229 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr)); 2230 2231 err = proto_register(&hci_sk_proto, 0); 2232 if (err < 0) 2233 return err; 2234 2235 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops); 2236 if (err < 0) { 2237 BT_ERR("HCI socket registration failed"); 2238 goto error; 2239 } 2240 2241 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL); 2242 if (err < 0) { 2243 BT_ERR("Failed to create HCI proc file"); 2244 bt_sock_unregister(BTPROTO_HCI); 2245 goto error; 2246 } 2247 2248 BT_INFO("HCI socket layer initialized"); 2249 2250 return 0; 2251 2252 error: 2253 proto_unregister(&hci_sk_proto); 2254 return err; 2255 } 2256 2257 void hci_sock_cleanup(void) 2258 { 2259 bt_procfs_cleanup(&init_net, "hci"); 2260 bt_sock_unregister(BTPROTO_HCI); 2261 proto_unregister(&hci_sk_proto); 2262 } 2263