net/bluetooth/iso.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  * Copyright (C) 2022 Intel Corporation
   6  * Copyright 2023 NXP
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/sched/signal.h>
  13
  14 #include <net/bluetooth/bluetooth.h>
  15 #include <net/bluetooth/hci_core.h>
  16 #include <net/bluetooth/iso.h>
  17 #include "eir.h"
  18
  19 static const struct proto_ops iso_sock_ops;
  20
  21 static struct bt_sock_list iso_sk_list = {
  22         .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
  23 };
  24
  25 /* ---- ISO connections ---- */
  26 struct iso_conn {
  27         struct hci_conn *hcon;
  28
  29         /* @lock: spinlock protecting changes to iso_conn fields */
  30         spinlock_t      lock;
  31         struct sock     *sk;
  32
  33         struct delayed_work     timeout_work;
  34
  35         struct sk_buff  *rx_skb;
  36         __u32           rx_len;
  37         __u16           tx_sn;
  38 };
  39
  40 #define iso_conn_lock(c)        spin_lock(&(c)->lock)
  41 #define iso_conn_unlock(c)      spin_unlock(&(c)->lock)
  42
  43 static void iso_sock_close(struct sock *sk);
  44 static void iso_sock_kill(struct sock *sk);
  45
  46 /* ----- ISO socket info ----- */
  47 #define iso_pi(sk) ((struct iso_pinfo *)sk)
  48
  49 #define EIR_SERVICE_DATA_LENGTH 4
  50 #define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
  51 #define EIR_BAA_SERVICE_UUID    0x1851
  52
  53 /* iso_pinfo flags values */
  54 enum {
  55         BT_SK_BIG_SYNC,
  56         BT_SK_PA_SYNC,
  57 };
  58
  59 struct iso_pinfo {
  60         struct bt_sock          bt;
  61         bdaddr_t                src;
  62         __u8                    src_type;
  63         bdaddr_t                dst;
  64         __u8                    dst_type;
  65         __u8                    bc_sid;
  66         __u8                    bc_num_bis;
  67         __u8                    bc_bis[ISO_MAX_NUM_BIS];
  68         __u16                   sync_handle;
  69         unsigned long           flags;
  70         struct bt_iso_qos       qos;
  71         bool                    qos_user_set;
  72         __u8                    base_len;
  73         __u8                    base[BASE_MAX_LENGTH];
  74         struct iso_conn         *conn;
  75 };
  76
  77 static struct bt_iso_qos default_qos;
  78
  79 static bool check_ucast_qos(struct bt_iso_qos *qos);
  80 static bool check_bcast_qos(struct bt_iso_qos *qos);
  81 static bool iso_match_sid(struct sock *sk, void *data);
  82 static bool iso_match_sync_handle(struct sock *sk, void *data);
  83 static void iso_sock_disconn(struct sock *sk);
  84
  85 /* ---- ISO timers ---- */
  86 #define ISO_CONN_TIMEOUT        (HZ * 40)
  87 #define ISO_DISCONN_TIMEOUT     (HZ * 2)
  88
  89 static void iso_sock_timeout(struct work_struct *work)
  90 {
  91         struct iso_conn *conn = container_of(work, struct iso_conn,
  92                                              timeout_work.work);
  93         struct sock *sk;
  94
  95         iso_conn_lock(conn);
  96         sk = conn->sk;
  97         if (sk)
  98                 sock_hold(sk);
  99         iso_conn_unlock(conn);
 100
 101         if (!sk)
 102                 return;
 103
 104         BT_DBG("sock %p state %d", sk, sk->sk_state);
 105
 106         lock_sock(sk);
 107         sk->sk_err = ETIMEDOUT;
 108         sk->sk_state_change(sk);
 109         release_sock(sk);
 110         sock_put(sk);
 111 }
 112
 113 static void iso_sock_set_timer(struct sock *sk, long timeout)
 114 {
 115         if (!iso_pi(sk)->conn)
 116                 return;
 117
 118         BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
 119         cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
 120         schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
 121 }
 122
 123 static void iso_sock_clear_timer(struct sock *sk)
 124 {
 125         if (!iso_pi(sk)->conn)
 126                 return;
 127
 128         BT_DBG("sock %p state %d", sk, sk->sk_state);
 129         cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
 130 }
 131
 132 /* ---- ISO connections ---- */
 133 static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
 134 {
 135         struct iso_conn *conn = hcon->iso_data;
 136
 137         if (conn) {
 138                 if (!conn->hcon)
 139                         conn->hcon = hcon;
 140                 return conn;
 141         }
 142
 143         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 144         if (!conn)
 145                 return NULL;
 146
 147         spin_lock_init(&conn->lock);
 148         INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
 149
 150         hcon->iso_data = conn;
 151         conn->hcon = hcon;
 152         conn->tx_sn = 0;
 153
 154         BT_DBG("hcon %p conn %p", hcon, conn);
 155
 156         return conn;
 157 }
 158
 159 /* Delete channel. Must be called on the locked socket. */
 160 static void iso_chan_del(struct sock *sk, int err)
 161 {
 162         struct iso_conn *conn;
 163         struct sock *parent;
 164
 165         conn = iso_pi(sk)->conn;
 166
 167         BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
 168
 169         if (conn) {
 170                 iso_conn_lock(conn);
 171                 conn->sk = NULL;
 172                 iso_pi(sk)->conn = NULL;
 173                 iso_conn_unlock(conn);
 174
 175                 if (conn->hcon)
 176                         hci_conn_drop(conn->hcon);
 177         }
 178
 179         sk->sk_state = BT_CLOSED;
 180         sk->sk_err   = err;
 181
 182         parent = bt_sk(sk)->parent;
 183         if (parent) {
 184                 bt_accept_unlink(sk);
 185                 parent->sk_data_ready(parent);
 186         } else {
 187                 sk->sk_state_change(sk);
 188         }
 189
 190         sock_set_flag(sk, SOCK_ZAPPED);
 191 }
 192
 193 static void iso_conn_del(struct hci_conn *hcon, int err)
 194 {
 195         struct iso_conn *conn = hcon->iso_data;
 196         struct sock *sk;
 197
 198         if (!conn)
 199                 return;
 200
 201         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
 202
 203         /* Kill socket */
 204         iso_conn_lock(conn);
 205         sk = conn->sk;
 206         if (sk)
 207                 sock_hold(sk);
 208         iso_conn_unlock(conn);
 209
 210         if (sk) {
 211                 lock_sock(sk);
 212                 iso_sock_clear_timer(sk);
 213                 iso_chan_del(sk, err);
 214                 release_sock(sk);
 215                 sock_put(sk);
 216         }
 217
 218         /* Ensure no more work items will run before freeing conn. */
 219         cancel_delayed_work_sync(&conn->timeout_work);
 220
 221         hcon->iso_data = NULL;
 222         kfree(conn);
 223 }
 224
 225 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
 226                           struct sock *parent)
 227 {
 228         BT_DBG("conn %p", conn);
 229
 230         if (iso_pi(sk)->conn == conn && conn->sk == sk)
 231                 return 0;
 232
 233         if (conn->sk) {
 234                 BT_ERR("conn->sk already set");
 235                 return -EBUSY;
 236         }
 237
 238         iso_pi(sk)->conn = conn;
 239         conn->sk = sk;
 240
 241         if (parent)
 242                 bt_accept_enqueue(parent, sk, true);
 243
 244         return 0;
 245 }
 246
 247 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
 248                         struct sock *parent)
 249 {
 250         int err;
 251
 252         iso_conn_lock(conn);
 253         err = __iso_chan_add(conn, sk, parent);
 254         iso_conn_unlock(conn);
 255
 256         return err;
 257 }
 258
 259 static inline u8 le_addr_type(u8 bdaddr_type)
 260 {
 261         if (bdaddr_type == BDADDR_LE_PUBLIC)
 262                 return ADDR_LE_DEV_PUBLIC;
 263         else
 264                 return ADDR_LE_DEV_RANDOM;
 265 }
 266
 267 static int iso_connect_bis(struct sock *sk)
 268 {
 269         struct iso_conn *conn;
 270         struct hci_conn *hcon;
 271         struct hci_dev  *hdev;
 272         int err;
 273
 274         BT_DBG("%pMR", &iso_pi(sk)->src);
 275
 276         hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
 277                              iso_pi(sk)->src_type);
 278         if (!hdev)
 279                 return -EHOSTUNREACH;
 280
 281         hci_dev_lock(hdev);
 282
 283         if (!bis_capable(hdev)) {
 284                 err = -EOPNOTSUPP;
 285                 goto unlock;
 286         }
 287
 288         /* Fail if user set invalid QoS */
 289         if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
 290                 iso_pi(sk)->qos = default_qos;
 291                 err = -EINVAL;
 292                 goto unlock;
 293         }
 294
 295         /* Fail if out PHYs are marked as disabled */
 296         if (!iso_pi(sk)->qos.bcast.out.phy) {
 297                 err = -EINVAL;
 298                 goto unlock;
 299         }
 300
 301         /* Just bind if DEFER_SETUP has been set */
 302         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 303                 hcon = hci_bind_bis(hdev, &iso_pi(sk)->dst,
 304                                     &iso_pi(sk)->qos, iso_pi(sk)->base_len,
 305                                     iso_pi(sk)->base);
 306                 if (IS_ERR(hcon)) {
 307                         err = PTR_ERR(hcon);
 308                         goto unlock;
 309                 }
 310         } else {
 311                 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
 312                                        le_addr_type(iso_pi(sk)->dst_type),
 313                                        &iso_pi(sk)->qos, iso_pi(sk)->base_len,
 314                                        iso_pi(sk)->base);
 315                 if (IS_ERR(hcon)) {
 316                         err = PTR_ERR(hcon);
 317                         goto unlock;
 318                 }
 319         }
 320
 321         conn = iso_conn_add(hcon);
 322         if (!conn) {
 323                 hci_conn_drop(hcon);
 324                 err = -ENOMEM;
 325                 goto unlock;
 326         }
 327
 328         lock_sock(sk);
 329
 330         err = iso_chan_add(conn, sk, NULL);
 331         if (err) {
 332                 release_sock(sk);
 333                 goto unlock;
 334         }
 335
 336         /* Update source addr of the socket */
 337         bacpy(&iso_pi(sk)->src, &hcon->src);
 338
 339         if (hcon->state == BT_CONNECTED) {
 340                 iso_sock_clear_timer(sk);
 341                 sk->sk_state = BT_CONNECTED;
 342         } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 343                 iso_sock_clear_timer(sk);
 344                 sk->sk_state = BT_CONNECT;
 345         } else {
 346                 sk->sk_state = BT_CONNECT;
 347                 iso_sock_set_timer(sk, sk->sk_sndtimeo);
 348         }
 349
 350         release_sock(sk);
 351
 352 unlock:
 353         hci_dev_unlock(hdev);
 354         hci_dev_put(hdev);
 355         return err;
 356 }
 357
 358 static int iso_connect_cis(struct sock *sk)
 359 {
 360         struct iso_conn *conn;
 361         struct hci_conn *hcon;
 362         struct hci_dev  *hdev;
 363         int err;
 364
 365         BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
 366
 367         hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
 368                              iso_pi(sk)->src_type);
 369         if (!hdev)
 370                 return -EHOSTUNREACH;
 371
 372         hci_dev_lock(hdev);
 373
 374         if (!cis_central_capable(hdev)) {
 375                 err = -EOPNOTSUPP;
 376                 goto unlock;
 377         }
 378
 379         /* Fail if user set invalid QoS */
 380         if (iso_pi(sk)->qos_user_set && !check_ucast_qos(&iso_pi(sk)->qos)) {
 381                 iso_pi(sk)->qos = default_qos;
 382                 err = -EINVAL;
 383                 goto unlock;
 384         }
 385
 386         /* Fail if either PHYs are marked as disabled */
 387         if (!iso_pi(sk)->qos.ucast.in.phy && !iso_pi(sk)->qos.ucast.out.phy) {
 388                 err = -EINVAL;
 389                 goto unlock;
 390         }
 391
 392         /* Just bind if DEFER_SETUP has been set */
 393         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 394                 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
 395                                     le_addr_type(iso_pi(sk)->dst_type),
 396                                     &iso_pi(sk)->qos);
 397                 if (IS_ERR(hcon)) {
 398                         err = PTR_ERR(hcon);
 399                         goto unlock;
 400                 }
 401         } else {
 402                 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
 403                                        le_addr_type(iso_pi(sk)->dst_type),
 404                                        &iso_pi(sk)->qos);
 405                 if (IS_ERR(hcon)) {
 406                         err = PTR_ERR(hcon);
 407                         goto unlock;
 408                 }
 409         }
 410
 411         conn = iso_conn_add(hcon);
 412         if (!conn) {
 413                 hci_conn_drop(hcon);
 414                 err = -ENOMEM;
 415                 goto unlock;
 416         }
 417
 418         lock_sock(sk);
 419
 420         err = iso_chan_add(conn, sk, NULL);
 421         if (err) {
 422                 release_sock(sk);
 423                 goto unlock;
 424         }
 425
 426         /* Update source addr of the socket */
 427         bacpy(&iso_pi(sk)->src, &hcon->src);
 428
 429         if (hcon->state == BT_CONNECTED) {
 430                 iso_sock_clear_timer(sk);
 431                 sk->sk_state = BT_CONNECTED;
 432         } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 433                 iso_sock_clear_timer(sk);
 434                 sk->sk_state = BT_CONNECT;
 435         } else {
 436                 sk->sk_state = BT_CONNECT;
 437                 iso_sock_set_timer(sk, sk->sk_sndtimeo);
 438         }
 439
 440         release_sock(sk);
 441
 442 unlock:
 443         hci_dev_unlock(hdev);
 444         hci_dev_put(hdev);
 445         return err;
 446 }
 447
 448 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
 449 {
 450         if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
 451                 return &iso_pi(sk)->conn->hcon->iso_qos;
 452
 453         return &iso_pi(sk)->qos;
 454 }
 455
 456 static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
 457 {
 458         struct iso_conn *conn = iso_pi(sk)->conn;
 459         struct bt_iso_qos *qos = iso_sock_get_qos(sk);
 460         struct hci_iso_data_hdr *hdr;
 461         int len = 0;
 462
 463         BT_DBG("sk %p len %d", sk, skb->len);
 464
 465         if (skb->len > qos->ucast.out.sdu)
 466                 return -EMSGSIZE;
 467
 468         len = skb->len;
 469
 470         /* Push ISO data header */
 471         hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
 472         hdr->sn = cpu_to_le16(conn->tx_sn++);
 473         hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
 474                                                       HCI_ISO_STATUS_VALID));
 475
 476         if (sk->sk_state == BT_CONNECTED)
 477                 hci_send_iso(conn->hcon, skb);
 478         else
 479                 len = -ENOTCONN;
 480
 481         return len;
 482 }
 483
 484 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
 485 {
 486         struct sock *sk;
 487
 488         iso_conn_lock(conn);
 489         sk = conn->sk;
 490         iso_conn_unlock(conn);
 491
 492         if (!sk)
 493                 goto drop;
 494
 495         BT_DBG("sk %p len %d", sk, skb->len);
 496
 497         if (sk->sk_state != BT_CONNECTED)
 498                 goto drop;
 499
 500         if (!sock_queue_rcv_skb(sk, skb))
 501                 return;
 502
 503 drop:
 504         kfree_skb(skb);
 505 }
 506
 507 /* -------- Socket interface ---------- */
 508 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
 509 {
 510         struct sock *sk;
 511
 512         sk_for_each(sk, &iso_sk_list.head) {
 513                 if (sk->sk_state != BT_LISTEN)
 514                         continue;
 515
 516                 if (bacmp(&iso_pi(sk)->dst, dst))
 517                         continue;
 518
 519                 if (!bacmp(&iso_pi(sk)->src, src))
 520                         return sk;
 521         }
 522
 523         return NULL;
 524 }
 525
 526 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
 527                                                  __u8 sid)
 528 {
 529         struct sock *sk;
 530
 531         sk_for_each(sk, &iso_sk_list.head) {
 532                 if (sk->sk_state != BT_LISTEN)
 533                         continue;
 534
 535                 if (bacmp(&iso_pi(sk)->src, ba))
 536                         continue;
 537
 538                 if (bacmp(&iso_pi(sk)->dst, bc))
 539                         continue;
 540
 541                 if (iso_pi(sk)->bc_sid == sid)
 542                         return sk;
 543         }
 544
 545         return NULL;
 546 }
 547
 548 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
 549
 550 /* Find socket listening:
 551  * source bdaddr (Unicast)
 552  * destination bdaddr (Broadcast only)
 553  * match func - pass NULL to ignore
 554  * match func data - pass -1 to ignore
 555  * Returns closest match.
 556  */
 557 static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
 558                                         iso_sock_match_t match, void *data)
 559 {
 560         struct sock *sk = NULL, *sk1 = NULL;
 561
 562         read_lock(&iso_sk_list.lock);
 563
 564         sk_for_each(sk, &iso_sk_list.head) {
 565                 if (sk->sk_state != BT_LISTEN)
 566                         continue;
 567
 568                 /* Match Broadcast destination */
 569                 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
 570                         continue;
 571
 572                 /* Use Match function if provided */
 573                 if (match && !match(sk, data))
 574                         continue;
 575
 576                 /* Exact match. */
 577                 if (!bacmp(&iso_pi(sk)->src, src))
 578                         break;
 579
 580                 /* Closest match */
 581                 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY))
 582                         sk1 = sk;
 583         }
 584
 585         read_unlock(&iso_sk_list.lock);
 586
 587         return sk ? sk : sk1;
 588 }
 589
 590 static void iso_sock_destruct(struct sock *sk)
 591 {
 592         BT_DBG("sk %p", sk);
 593
 594         skb_queue_purge(&sk->sk_receive_queue);
 595         skb_queue_purge(&sk->sk_write_queue);
 596 }
 597
 598 static void iso_sock_cleanup_listen(struct sock *parent)
 599 {
 600         struct sock *sk;
 601
 602         BT_DBG("parent %p", parent);
 603
 604         /* Close not yet accepted channels */
 605         while ((sk = bt_accept_dequeue(parent, NULL))) {
 606                 iso_sock_close(sk);
 607                 iso_sock_kill(sk);
 608         }
 609
 610         /* If listening socket stands for a PA sync connection,
 611          * properly disconnect the hcon and socket.
 612          */
 613         if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon &&
 614             test_bit(HCI_CONN_PA_SYNC, &iso_pi(parent)->conn->hcon->flags)) {
 615                 iso_sock_disconn(parent);
 616                 return;
 617         }
 618
 619         parent->sk_state  = BT_CLOSED;
 620         sock_set_flag(parent, SOCK_ZAPPED);
 621 }
 622
 623 /* Kill socket (only if zapped and orphan)
 624  * Must be called on unlocked socket.
 625  */
 626 static void iso_sock_kill(struct sock *sk)
 627 {
 628         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
 629             sock_flag(sk, SOCK_DEAD))
 630                 return;
 631
 632         BT_DBG("sk %p state %d", sk, sk->sk_state);
 633
 634         /* Kill poor orphan */
 635         bt_sock_unlink(&iso_sk_list, sk);
 636         sock_set_flag(sk, SOCK_DEAD);
 637         sock_put(sk);
 638 }
 639
 640 static void iso_sock_disconn(struct sock *sk)
 641 {
 642         sk->sk_state = BT_DISCONN;
 643         iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
 644         iso_conn_lock(iso_pi(sk)->conn);
 645         hci_conn_drop(iso_pi(sk)->conn->hcon);
 646         iso_pi(sk)->conn->hcon = NULL;
 647         iso_conn_unlock(iso_pi(sk)->conn);
 648 }
 649
 650 static void __iso_sock_close(struct sock *sk)
 651 {
 652         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 653
 654         switch (sk->sk_state) {
 655         case BT_LISTEN:
 656                 iso_sock_cleanup_listen(sk);
 657                 break;
 658
 659         case BT_CONNECT:
 660         case BT_CONNECTED:
 661         case BT_CONFIG:
 662                 if (iso_pi(sk)->conn->hcon)
 663                         iso_sock_disconn(sk);
 664                 else
 665                         iso_chan_del(sk, ECONNRESET);
 666                 break;
 667
 668         case BT_CONNECT2:
 669                 if (iso_pi(sk)->conn->hcon &&
 670                     (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
 671                     test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
 672                         iso_sock_disconn(sk);
 673                 else
 674                         iso_chan_del(sk, ECONNRESET);
 675                 break;
 676         case BT_DISCONN:
 677                 iso_chan_del(sk, ECONNRESET);
 678                 break;
 679
 680         default:
 681                 sock_set_flag(sk, SOCK_ZAPPED);
 682                 break;
 683         }
 684 }
 685
 686 /* Must be called on unlocked socket. */
 687 static void iso_sock_close(struct sock *sk)
 688 {
 689         iso_sock_clear_timer(sk);
 690         lock_sock(sk);
 691         __iso_sock_close(sk);
 692         release_sock(sk);
 693         iso_sock_kill(sk);
 694 }
 695
 696 static void iso_sock_init(struct sock *sk, struct sock *parent)
 697 {
 698         BT_DBG("sk %p", sk);
 699
 700         if (parent) {
 701                 sk->sk_type = parent->sk_type;
 702                 bt_sk(sk)->flags = bt_sk(parent)->flags;
 703                 security_sk_clone(parent, sk);
 704         }
 705 }
 706
 707 static struct proto iso_proto = {
 708         .name           = "ISO",
 709         .owner          = THIS_MODULE,
 710         .obj_size       = sizeof(struct iso_pinfo)
 711 };
 712
 713 #define DEFAULT_IO_QOS \
 714 { \
 715         .interval       = 10000u, \
 716         .latency        = 10u, \
 717         .sdu            = 40u, \
 718         .phy            = BT_ISO_PHY_2M, \
 719         .rtn            = 2u, \
 720 }
 721
 722 static struct bt_iso_qos default_qos = {
 723         .bcast = {
 724                 .big                    = BT_ISO_QOS_BIG_UNSET,
 725                 .bis                    = BT_ISO_QOS_BIS_UNSET,
 726                 .sync_factor            = 0x01,
 727                 .packing                = 0x00,
 728                 .framing                = 0x00,
 729                 .in                     = DEFAULT_IO_QOS,
 730                 .out                    = DEFAULT_IO_QOS,
 731                 .encryption             = 0x00,
 732                 .bcode                  = {0x00},
 733                 .options                = 0x00,
 734                 .skip                   = 0x0000,
 735                 .sync_timeout           = 0x4000,
 736                 .sync_cte_type          = 0x00,
 737                 .mse                    = 0x00,
 738                 .timeout                = 0x4000,
 739         },
 740 };
 741
 742 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
 743                                    int proto, gfp_t prio, int kern)
 744 {
 745         struct sock *sk;
 746
 747         sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern);
 748         if (!sk)
 749                 return NULL;
 750
 751         sk->sk_destruct = iso_sock_destruct;
 752         sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
 753
 754         /* Set address type as public as default src address is BDADDR_ANY */
 755         iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
 756
 757         iso_pi(sk)->qos = default_qos;
 758
 759         bt_sock_link(&iso_sk_list, sk);
 760         return sk;
 761 }
 762
 763 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
 764                            int kern)
 765 {
 766         struct sock *sk;
 767
 768         BT_DBG("sock %p", sock);
 769
 770         sock->state = SS_UNCONNECTED;
 771
 772         if (sock->type != SOCK_SEQPACKET)
 773                 return -ESOCKTNOSUPPORT;
 774
 775         sock->ops = &iso_sock_ops;
 776
 777         sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
 778         if (!sk)
 779                 return -ENOMEM;
 780
 781         iso_sock_init(sk, NULL);
 782         return 0;
 783 }
 784
 785 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
 786                             int addr_len)
 787 {
 788         struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
 789         struct sock *sk = sock->sk;
 790         int i;
 791
 792         BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
 793                sa->iso_bc->bc_num_bis);
 794
 795         if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc))
 796                 return -EINVAL;
 797
 798         bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
 799         iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
 800         iso_pi(sk)->sync_handle = -1;
 801         iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
 802         iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
 803
 804         for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
 805                 if (sa->iso_bc->bc_bis[i] < 0x01 ||
 806                     sa->iso_bc->bc_bis[i] > 0x1f)
 807                         return -EINVAL;
 808
 809                 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
 810                        iso_pi(sk)->bc_num_bis);
 811         }
 812
 813         return 0;
 814 }
 815
 816 static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
 817                          int addr_len)
 818 {
 819         struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
 820         struct sock *sk = sock->sk;
 821         int err = 0;
 822
 823         BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
 824
 825         if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
 826             addr->sa_family != AF_BLUETOOTH)
 827                 return -EINVAL;
 828
 829         lock_sock(sk);
 830
 831         if (sk->sk_state != BT_OPEN) {
 832                 err = -EBADFD;
 833                 goto done;
 834         }
 835
 836         if (sk->sk_type != SOCK_SEQPACKET) {
 837                 err = -EINVAL;
 838                 goto done;
 839         }
 840
 841         /* Check if the address type is of LE type */
 842         if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
 843                 err = -EINVAL;
 844                 goto done;
 845         }
 846
 847         bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
 848         iso_pi(sk)->src_type = sa->iso_bdaddr_type;
 849
 850         /* Check for Broadcast address */
 851         if (addr_len > sizeof(*sa)) {
 852                 err = iso_sock_bind_bc(sock, addr, addr_len);
 853                 if (err)
 854                         goto done;
 855         }
 856
 857         sk->sk_state = BT_BOUND;
 858
 859 done:
 860         release_sock(sk);
 861         return err;
 862 }
 863
 864 static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
 865                             int alen, int flags)
 866 {
 867         struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
 868         struct sock *sk = sock->sk;
 869         int err;
 870
 871         BT_DBG("sk %p", sk);
 872
 873         if (alen < sizeof(struct sockaddr_iso) ||
 874             addr->sa_family != AF_BLUETOOTH)
 875                 return -EINVAL;
 876
 877         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
 878                 return -EBADFD;
 879
 880         if (sk->sk_type != SOCK_SEQPACKET)
 881                 return -EINVAL;
 882
 883         /* Check if the address type is of LE type */
 884         if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
 885                 return -EINVAL;
 886
 887         lock_sock(sk);
 888
 889         bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
 890         iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
 891
 892         release_sock(sk);
 893
 894         if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
 895                 err = iso_connect_cis(sk);
 896         else
 897                 err = iso_connect_bis(sk);
 898
 899         if (err)
 900                 return err;
 901
 902         lock_sock(sk);
 903
 904         if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 905                 err = bt_sock_wait_state(sk, BT_CONNECTED,
 906                                          sock_sndtimeo(sk, flags & O_NONBLOCK));
 907         }
 908
 909         release_sock(sk);
 910         return err;
 911 }
 912
 913 static int iso_listen_bis(struct sock *sk)
 914 {
 915         struct hci_dev *hdev;
 916         int err = 0;
 917
 918         BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
 919                &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
 920
 921         write_lock(&iso_sk_list.lock);
 922
 923         if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
 924                                          iso_pi(sk)->bc_sid))
 925                 err = -EADDRINUSE;
 926
 927         write_unlock(&iso_sk_list.lock);
 928
 929         if (err)
 930                 return err;
 931
 932         hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
 933                              iso_pi(sk)->src_type);
 934         if (!hdev)
 935                 return -EHOSTUNREACH;
 936
 937         /* Fail if user set invalid QoS */
 938         if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
 939                 iso_pi(sk)->qos = default_qos;
 940                 return -EINVAL;
 941         }
 942
 943         err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
 944                                  le_addr_type(iso_pi(sk)->dst_type),
 945                                  iso_pi(sk)->bc_sid, &iso_pi(sk)->qos);
 946
 947         hci_dev_put(hdev);
 948
 949         return err;
 950 }
 951
 952 static int iso_listen_cis(struct sock *sk)
 953 {
 954         int err = 0;
 955
 956         BT_DBG("%pMR", &iso_pi(sk)->src);
 957
 958         write_lock(&iso_sk_list.lock);
 959
 960         if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst))
 961                 err = -EADDRINUSE;
 962
 963         write_unlock(&iso_sk_list.lock);
 964
 965         return err;
 966 }
 967
 968 static int iso_sock_listen(struct socket *sock, int backlog)
 969 {
 970         struct sock *sk = sock->sk;
 971         int err = 0;
 972
 973         BT_DBG("sk %p backlog %d", sk, backlog);
 974
 975         lock_sock(sk);
 976
 977         if (sk->sk_state != BT_BOUND) {
 978                 err = -EBADFD;
 979                 goto done;
 980         }
 981
 982         if (sk->sk_type != SOCK_SEQPACKET) {
 983                 err = -EINVAL;
 984                 goto done;
 985         }
 986
 987         if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
 988                 err = iso_listen_cis(sk);
 989         else
 990                 err = iso_listen_bis(sk);
 991
 992         if (err)
 993                 goto done;
 994
 995         sk->sk_max_ack_backlog = backlog;
 996         sk->sk_ack_backlog = 0;
 997
 998         sk->sk_state = BT_LISTEN;
 999
1000 done:
1001         release_sock(sk);
1002         return err;
1003 }
1004
1005 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1006                            int flags, bool kern)
1007 {
1008         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1009         struct sock *sk = sock->sk, *ch;
1010         long timeo;
1011         int err = 0;
1012
1013         lock_sock(sk);
1014
1015         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1016
1017         BT_DBG("sk %p timeo %ld", sk, timeo);
1018
1019         /* Wait for an incoming connection. (wake-one). */
1020         add_wait_queue_exclusive(sk_sleep(sk), &wait);
1021         while (1) {
1022                 if (sk->sk_state != BT_LISTEN) {
1023                         err = -EBADFD;
1024                         break;
1025                 }
1026
1027                 ch = bt_accept_dequeue(sk, newsock);
1028                 if (ch)
1029                         break;
1030
1031                 if (!timeo) {
1032                         err = -EAGAIN;
1033                         break;
1034                 }
1035
1036                 if (signal_pending(current)) {
1037                         err = sock_intr_errno(timeo);
1038                         break;
1039                 }
1040
1041                 release_sock(sk);
1042
1043                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1044                 lock_sock(sk);
1045         }
1046         remove_wait_queue(sk_sleep(sk), &wait);
1047
1048         if (err)
1049                 goto done;
1050
1051         newsock->state = SS_CONNECTED;
1052
1053         BT_DBG("new socket %p", ch);
1054
1055 done:
1056         release_sock(sk);
1057         return err;
1058 }
1059
1060 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1061                             int peer)
1062 {
1063         struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1064         struct sock *sk = sock->sk;
1065
1066         BT_DBG("sock %p, sk %p", sock, sk);
1067
1068         addr->sa_family = AF_BLUETOOTH;
1069
1070         if (peer) {
1071                 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1072                 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1073         } else {
1074                 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1075                 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1076         }
1077
1078         return sizeof(struct sockaddr_iso);
1079 }
1080
1081 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1082                             size_t len)
1083 {
1084         struct sock *sk = sock->sk;
1085         struct sk_buff *skb, **frag;
1086         size_t mtu;
1087         int err;
1088
1089         BT_DBG("sock %p, sk %p", sock, sk);
1090
1091         err = sock_error(sk);
1092         if (err)
1093                 return err;
1094
1095         if (msg->msg_flags & MSG_OOB)
1096                 return -EOPNOTSUPP;
1097
1098         lock_sock(sk);
1099
1100         if (sk->sk_state != BT_CONNECTED) {
1101                 release_sock(sk);
1102                 return -ENOTCONN;
1103         }
1104
1105         mtu = iso_pi(sk)->conn->hcon->hdev->iso_mtu;
1106
1107         release_sock(sk);
1108
1109         skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1110         if (IS_ERR(skb))
1111                 return PTR_ERR(skb);
1112
1113         len -= skb->len;
1114
1115         BT_DBG("skb %p len %d", sk, skb->len);
1116
1117         /* Continuation fragments */
1118         frag = &skb_shinfo(skb)->frag_list;
1119         while (len) {
1120                 struct sk_buff *tmp;
1121
1122                 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1123                 if (IS_ERR(tmp)) {
1124                         kfree_skb(skb);
1125                         return PTR_ERR(tmp);
1126                 }
1127
1128                 *frag = tmp;
1129
1130                 len  -= tmp->len;
1131
1132                 skb->len += tmp->len;
1133                 skb->data_len += tmp->len;
1134
1135                 BT_DBG("frag %p len %d", *frag, tmp->len);
1136
1137                 frag = &(*frag)->next;
1138         }
1139
1140         lock_sock(sk);
1141
1142         if (sk->sk_state == BT_CONNECTED)
1143                 err = iso_send_frame(sk, skb);
1144         else
1145                 err = -ENOTCONN;
1146
1147         release_sock(sk);
1148
1149         if (err < 0)
1150                 kfree_skb(skb);
1151         return err;
1152 }
1153
1154 static void iso_conn_defer_accept(struct hci_conn *conn)
1155 {
1156         struct hci_cp_le_accept_cis cp;
1157         struct hci_dev *hdev = conn->hdev;
1158
1159         BT_DBG("conn %p", conn);
1160
1161         conn->state = BT_CONFIG;
1162
1163         cp.handle = cpu_to_le16(conn->handle);
1164
1165         hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1166 }
1167
1168 static void iso_conn_big_sync(struct sock *sk)
1169 {
1170         int err;
1171         struct hci_dev *hdev;
1172
1173         hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
1174                              iso_pi(sk)->src_type);
1175
1176         if (!hdev)
1177                 return;
1178
1179         if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1180                 err = hci_le_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
1181                                              &iso_pi(sk)->qos,
1182                                              iso_pi(sk)->sync_handle,
1183                                              iso_pi(sk)->bc_num_bis,
1184                                              iso_pi(sk)->bc_bis);
1185                 if (err)
1186                         bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1187                                    err);
1188         }
1189 }
1190
1191 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1192                             size_t len, int flags)
1193 {
1194         struct sock *sk = sock->sk;
1195         struct iso_pinfo *pi = iso_pi(sk);
1196
1197         BT_DBG("sk %p", sk);
1198
1199         if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1200                 lock_sock(sk);
1201                 switch (sk->sk_state) {
1202                 case BT_CONNECT2:
1203                         if (pi->conn->hcon &&
1204                             test_bit(HCI_CONN_PA_SYNC, &pi->conn->hcon->flags)) {
1205                                 iso_conn_big_sync(sk);
1206                                 sk->sk_state = BT_LISTEN;
1207                         } else {
1208                                 iso_conn_defer_accept(pi->conn->hcon);
1209                                 sk->sk_state = BT_CONFIG;
1210                         }
1211                         release_sock(sk);
1212                         return 0;
1213                 case BT_CONNECT:
1214                         release_sock(sk);
1215                         return iso_connect_cis(sk);
1216                 default:
1217                         release_sock(sk);
1218                         break;
1219                 }
1220         }
1221
1222         return bt_sock_recvmsg(sock, msg, len, flags);
1223 }
1224
1225 static bool check_io_qos(struct bt_iso_io_qos *qos)
1226 {
1227         /* If no PHY is enable SDU must be 0 */
1228         if (!qos->phy && qos->sdu)
1229                 return false;
1230
1231         if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1232                 return false;
1233
1234         if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1235                 return false;
1236
1237         if (qos->phy > BT_ISO_PHY_ANY)
1238                 return false;
1239
1240         return true;
1241 }
1242
1243 static bool check_ucast_qos(struct bt_iso_qos *qos)
1244 {
1245         if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1246                 return false;
1247
1248         if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1249                 return false;
1250
1251         if (qos->ucast.sca > 0x07)
1252                 return false;
1253
1254         if (qos->ucast.packing > 0x01)
1255                 return false;
1256
1257         if (qos->ucast.framing > 0x01)
1258                 return false;
1259
1260         if (!check_io_qos(&qos->ucast.in))
1261                 return false;
1262
1263         if (!check_io_qos(&qos->ucast.out))
1264                 return false;
1265
1266         return true;
1267 }
1268
1269 static bool check_bcast_qos(struct bt_iso_qos *qos)
1270 {
1271         if (qos->bcast.sync_factor == 0x00)
1272                 return false;
1273
1274         if (qos->bcast.packing > 0x01)
1275                 return false;
1276
1277         if (qos->bcast.framing > 0x01)
1278                 return false;
1279
1280         if (!check_io_qos(&qos->bcast.in))
1281                 return false;
1282
1283         if (!check_io_qos(&qos->bcast.out))
1284                 return false;
1285
1286         if (qos->bcast.encryption > 0x01)
1287                 return false;
1288
1289         if (qos->bcast.options > 0x07)
1290                 return false;
1291
1292         if (qos->bcast.skip > 0x01f3)
1293                 return false;
1294
1295         if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1296                 return false;
1297
1298         if (qos->bcast.sync_cte_type > 0x1f)
1299                 return false;
1300
1301         if (qos->bcast.mse > 0x1f)
1302                 return false;
1303
1304         if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1305                 return false;
1306
1307         return true;
1308 }
1309
1310 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1311                                sockptr_t optval, unsigned int optlen)
1312 {
1313         struct sock *sk = sock->sk;
1314         int len, err = 0;
1315         struct bt_iso_qos qos = default_qos;
1316         u32 opt;
1317
1318         BT_DBG("sk %p", sk);
1319
1320         lock_sock(sk);
1321
1322         switch (optname) {
1323         case BT_DEFER_SETUP:
1324                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1325                         err = -EINVAL;
1326                         break;
1327                 }
1328
1329                 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1330                         err = -EFAULT;
1331                         break;
1332                 }
1333
1334                 if (opt)
1335                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1336                 else
1337                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1338                 break;
1339
1340         case BT_PKT_STATUS:
1341                 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1342                         err = -EFAULT;
1343                         break;
1344                 }
1345
1346                 if (opt)
1347                         set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1348                 else
1349                         clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1350                 break;
1351
1352         case BT_ISO_QOS:
1353                 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1354                     sk->sk_state != BT_CONNECT2) {
1355                         err = -EINVAL;
1356                         break;
1357                 }
1358
1359                 len = min_t(unsigned int, sizeof(qos), optlen);
1360
1361                 if (copy_from_sockptr(&qos, optval, len)) {
1362                         err = -EFAULT;
1363                         break;
1364                 }
1365
1366                 if (len == sizeof(qos.ucast) && !check_ucast_qos(&qos)) {
1367                         err = -EINVAL;
1368                         break;
1369                 }
1370
1371                 iso_pi(sk)->qos = qos;
1372                 iso_pi(sk)->qos_user_set = true;
1373
1374                 break;
1375
1376         case BT_ISO_BASE:
1377                 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1378                     sk->sk_state != BT_CONNECT2) {
1379                         err = -EINVAL;
1380                         break;
1381                 }
1382
1383                 if (optlen > sizeof(iso_pi(sk)->base)) {
1384                         err = -EOVERFLOW;
1385                         break;
1386                 }
1387
1388                 len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
1389
1390                 if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
1391                         err = -EFAULT;
1392                         break;
1393                 }
1394
1395                 iso_pi(sk)->base_len = len;
1396
1397                 break;
1398
1399         default:
1400                 err = -ENOPROTOOPT;
1401                 break;
1402         }
1403
1404         release_sock(sk);
1405         return err;
1406 }
1407
1408 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1409                                char __user *optval, int __user *optlen)
1410 {
1411         struct sock *sk = sock->sk;
1412         int len, err = 0;
1413         struct bt_iso_qos *qos;
1414         u8 base_len;
1415         u8 *base;
1416
1417         BT_DBG("sk %p", sk);
1418
1419         if (get_user(len, optlen))
1420                 return -EFAULT;
1421
1422         lock_sock(sk);
1423
1424         switch (optname) {
1425         case BT_DEFER_SETUP:
1426                 if (sk->sk_state == BT_CONNECTED) {
1427                         err = -EINVAL;
1428                         break;
1429                 }
1430
1431                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1432                              (u32 __user *)optval))
1433                         err = -EFAULT;
1434
1435                 break;
1436
1437         case BT_PKT_STATUS:
1438                 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1439                              (int __user *)optval))
1440                         err = -EFAULT;
1441                 break;
1442
1443         case BT_ISO_QOS:
1444                 qos = iso_sock_get_qos(sk);
1445
1446                 len = min_t(unsigned int, len, sizeof(*qos));
1447                 if (copy_to_user(optval, qos, len))
1448                         err = -EFAULT;
1449
1450                 break;
1451
1452         case BT_ISO_BASE:
1453                 if (sk->sk_state == BT_CONNECTED &&
1454                     !bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1455                         base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1456                         base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1457                 } else {
1458                         base_len = iso_pi(sk)->base_len;
1459                         base = iso_pi(sk)->base;
1460                 }
1461
1462                 len = min_t(unsigned int, len, base_len);
1463                 if (copy_to_user(optval, base, len))
1464                         err = -EFAULT;
1465                 if (put_user(len, optlen))
1466                         err = -EFAULT;
1467
1468                 break;
1469
1470         default:
1471                 err = -ENOPROTOOPT;
1472                 break;
1473         }
1474
1475         release_sock(sk);
1476         return err;
1477 }
1478
1479 static int iso_sock_shutdown(struct socket *sock, int how)
1480 {
1481         struct sock *sk = sock->sk;
1482         int err = 0;
1483
1484         BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1485
1486         if (!sk)
1487                 return 0;
1488
1489         sock_hold(sk);
1490         lock_sock(sk);
1491
1492         switch (how) {
1493         case SHUT_RD:
1494                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1495                         goto unlock;
1496                 sk->sk_shutdown |= RCV_SHUTDOWN;
1497                 break;
1498         case SHUT_WR:
1499                 if (sk->sk_shutdown & SEND_SHUTDOWN)
1500                         goto unlock;
1501                 sk->sk_shutdown |= SEND_SHUTDOWN;
1502                 break;
1503         case SHUT_RDWR:
1504                 if (sk->sk_shutdown & SHUTDOWN_MASK)
1505                         goto unlock;
1506                 sk->sk_shutdown |= SHUTDOWN_MASK;
1507                 break;
1508         }
1509
1510         iso_sock_clear_timer(sk);
1511         __iso_sock_close(sk);
1512
1513         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1514             !(current->flags & PF_EXITING))
1515                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1516
1517 unlock:
1518         release_sock(sk);
1519         sock_put(sk);
1520
1521         return err;
1522 }
1523
1524 static int iso_sock_release(struct socket *sock)
1525 {
1526         struct sock *sk = sock->sk;
1527         int err = 0;
1528
1529         BT_DBG("sock %p, sk %p", sock, sk);
1530
1531         if (!sk)
1532                 return 0;
1533
1534         iso_sock_close(sk);
1535
1536         if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1537             !(current->flags & PF_EXITING)) {
1538                 lock_sock(sk);
1539                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1540                 release_sock(sk);
1541         }
1542
1543         sock_orphan(sk);
1544         iso_sock_kill(sk);
1545         return err;
1546 }
1547
1548 static void iso_sock_ready(struct sock *sk)
1549 {
1550         BT_DBG("sk %p", sk);
1551
1552         if (!sk)
1553                 return;
1554
1555         lock_sock(sk);
1556         iso_sock_clear_timer(sk);
1557         sk->sk_state = BT_CONNECTED;
1558         sk->sk_state_change(sk);
1559         release_sock(sk);
1560 }
1561
1562 struct iso_list_data {
1563         struct hci_conn *hcon;
1564         int count;
1565 };
1566
1567 static bool iso_match_big(struct sock *sk, void *data)
1568 {
1569         struct hci_evt_le_big_sync_estabilished *ev = data;
1570
1571         return ev->handle == iso_pi(sk)->qos.bcast.big;
1572 }
1573
1574 static bool iso_match_pa_sync_flag(struct sock *sk, void *data)
1575 {
1576         return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
1577 }
1578
1579 static void iso_conn_ready(struct iso_conn *conn)
1580 {
1581         struct sock *parent = NULL;
1582         struct sock *sk = conn->sk;
1583         struct hci_ev_le_big_sync_estabilished *ev = NULL;
1584         struct hci_ev_le_pa_sync_established *ev2 = NULL;
1585         struct hci_evt_le_big_info_adv_report *ev3 = NULL;
1586         struct hci_conn *hcon;
1587
1588         BT_DBG("conn %p", conn);
1589
1590         if (sk) {
1591                 iso_sock_ready(conn->sk);
1592         } else {
1593                 hcon = conn->hcon;
1594                 if (!hcon)
1595                         return;
1596
1597                 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags) ||
1598                     test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
1599                         ev = hci_recv_event_data(hcon->hdev,
1600                                                  HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
1601
1602                         /* Get reference to PA sync parent socket, if it exists */
1603                         parent = iso_get_sock_listen(&hcon->src,
1604                                                      &hcon->dst,
1605                                                      iso_match_pa_sync_flag, NULL);
1606                         if (!parent && ev)
1607                                 parent = iso_get_sock_listen(&hcon->src,
1608                                                              &hcon->dst,
1609                                                              iso_match_big, ev);
1610                 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
1611                         ev2 = hci_recv_event_data(hcon->hdev,
1612                                                   HCI_EV_LE_PA_SYNC_ESTABLISHED);
1613                         if (ev2)
1614                                 parent = iso_get_sock_listen(&hcon->src,
1615                                                              &hcon->dst,
1616                                                              iso_match_sid, ev2);
1617                 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
1618                         ev3 = hci_recv_event_data(hcon->hdev,
1619                                                   HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1620                         if (ev3)
1621                                 parent = iso_get_sock_listen(&hcon->src,
1622                                                              &hcon->dst,
1623                                                              iso_match_sync_handle, ev3);
1624                 }
1625
1626                 if (!parent)
1627                         parent = iso_get_sock_listen(&hcon->src,
1628                                                         BDADDR_ANY, NULL, NULL);
1629
1630                 if (!parent)
1631                         return;
1632
1633                 lock_sock(parent);
1634
1635                 sk = iso_sock_alloc(sock_net(parent), NULL,
1636                                     BTPROTO_ISO, GFP_ATOMIC, 0);
1637                 if (!sk) {
1638                         release_sock(parent);
1639                         return;
1640                 }
1641
1642                 iso_sock_init(sk, parent);
1643
1644                 bacpy(&iso_pi(sk)->src, &hcon->src);
1645
1646                 /* Convert from HCI to three-value type */
1647                 if (hcon->src_type == ADDR_LE_DEV_PUBLIC)
1648                         iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
1649                 else
1650                         iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
1651
1652                 /* If hcon has no destination address (BDADDR_ANY) it means it
1653                  * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or
1654                  * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using
1655                  * the parent socket destination address.
1656                  */
1657                 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
1658                         bacpy(&hcon->dst, &iso_pi(parent)->dst);
1659                         hcon->dst_type = iso_pi(parent)->dst_type;
1660                         hcon->sync_handle = iso_pi(parent)->sync_handle;
1661                 }
1662
1663                 if (ev3) {
1664                         iso_pi(sk)->qos = iso_pi(parent)->qos;
1665                         iso_pi(sk)->qos.bcast.encryption = ev3->encryption;
1666                         hcon->iso_qos = iso_pi(sk)->qos;
1667                         iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
1668                         memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis, ISO_MAX_NUM_BIS);
1669                         set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
1670                 }
1671
1672                 bacpy(&iso_pi(sk)->dst, &hcon->dst);
1673                 iso_pi(sk)->dst_type = hcon->dst_type;
1674                 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
1675                 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len);
1676                 iso_pi(sk)->base_len = iso_pi(parent)->base_len;
1677
1678                 hci_conn_hold(hcon);
1679                 iso_chan_add(conn, sk, parent);
1680
1681                 if ((ev && ((struct hci_evt_le_big_sync_estabilished *)ev)->status) ||
1682                     (ev2 && ev2->status)) {
1683                         /* Trigger error signal on child socket */
1684                         sk->sk_err = ECONNREFUSED;
1685                         sk->sk_error_report(sk);
1686                 }
1687
1688                 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1689                         sk->sk_state = BT_CONNECT2;
1690                 else
1691                         sk->sk_state = BT_CONNECTED;
1692
1693                 /* Wake up parent */
1694                 parent->sk_data_ready(parent);
1695
1696                 release_sock(parent);
1697         }
1698 }
1699
1700 static bool iso_match_sid(struct sock *sk, void *data)
1701 {
1702         struct hci_ev_le_pa_sync_established *ev = data;
1703
1704         return ev->sid == iso_pi(sk)->bc_sid;
1705 }
1706
1707 static bool iso_match_sync_handle(struct sock *sk, void *data)
1708 {
1709         struct hci_evt_le_big_info_adv_report *ev = data;
1710
1711         return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1712 }
1713
1714 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data)
1715 {
1716         struct hci_ev_le_per_adv_report *ev = data;
1717
1718         return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1719 }
1720
1721 /* ----- ISO interface with lower layer (HCI) ----- */
1722
1723 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1724 {
1725         struct hci_ev_le_pa_sync_established *ev1;
1726         struct hci_evt_le_big_info_adv_report *ev2;
1727         struct hci_ev_le_per_adv_report *ev3;
1728         struct sock *sk;
1729         int lm = 0;
1730
1731         bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
1732
1733         /* Broadcast receiver requires handling of some events before it can
1734          * proceed to establishing a BIG sync:
1735          *
1736          * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
1737          * SID to listen to and once sync is estabilished its handle needs to
1738          * be stored in iso_pi(sk)->sync_handle so it can be matched once
1739          * receiving the BIG Info.
1740          * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
1741          * a BIG Info it attempts to check if there any listening socket with
1742          * the same sync_handle and if it does then attempt to create a sync.
1743          * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored
1744          * in iso_pi(sk)->base so it can be passed up to user, in the case of a
1745          * broadcast sink.
1746          */
1747         ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
1748         if (ev1) {
1749                 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
1750                                          ev1);
1751                 if (sk && !ev1->status)
1752                         iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
1753
1754                 goto done;
1755         }
1756
1757         ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1758         if (ev2) {
1759                 /* Try to get PA sync listening socket, if it exists */
1760                 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1761                                                 iso_match_pa_sync_flag, NULL);
1762                 if (!sk)
1763                         sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1764                                                  iso_match_sync_handle, ev2);
1765                 if (sk) {
1766                         int err;
1767
1768                         if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
1769                                 iso_pi(sk)->bc_num_bis = ev2->num_bis;
1770
1771                         if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
1772                             !test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1773                                 err = hci_le_big_create_sync(hdev, NULL,
1774                                                              &iso_pi(sk)->qos,
1775                                                              iso_pi(sk)->sync_handle,
1776                                                              iso_pi(sk)->bc_num_bis,
1777                                                              iso_pi(sk)->bc_bis);
1778                                 if (err) {
1779                                         bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1780                                                    err);
1781                                         sk = NULL;
1782                                 }
1783                         }
1784                 }
1785         }
1786
1787         ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
1788         if (ev3) {
1789                 size_t base_len = ev3->length;
1790                 u8 *base;
1791
1792                 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1793                                          iso_match_sync_handle_pa_report, ev3);
1794                 base = eir_get_service_data(ev3->data, ev3->length,
1795                                             EIR_BAA_SERVICE_UUID, &base_len);
1796                 if (base && sk && base_len <= sizeof(iso_pi(sk)->base)) {
1797                         memcpy(iso_pi(sk)->base, base, base_len);
1798                         iso_pi(sk)->base_len = base_len;
1799                 }
1800         } else {
1801                 sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
1802         }
1803
1804 done:
1805         if (!sk)
1806                 return lm;
1807
1808         lm |= HCI_LM_ACCEPT;
1809
1810         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1811                 *flags |= HCI_PROTO_DEFER;
1812
1813         return lm;
1814 }
1815
1816 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
1817 {
1818         if (hcon->type != ISO_LINK) {
1819                 if (hcon->type != LE_LINK)
1820                         return;
1821
1822                 /* Check if LE link has failed */
1823                 if (status) {
1824                         struct hci_link *link, *t;
1825
1826                         list_for_each_entry_safe(link, t, &hcon->link_list,
1827                                                  list)
1828                                 iso_conn_del(link->conn, bt_to_errno(status));
1829
1830                         return;
1831                 }
1832
1833                 /* Create CIS if pending */
1834                 hci_le_create_cis_pending(hcon->hdev);
1835                 return;
1836         }
1837
1838         BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1839
1840         /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
1841          * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
1842          * into the accept queue of the listening socket and wake up
1843          * userspace, to inform the user about the event.
1844          */
1845         if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
1846             test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
1847                 struct iso_conn *conn;
1848
1849                 conn = iso_conn_add(hcon);
1850                 if (conn)
1851                         iso_conn_ready(conn);
1852         } else {
1853                 iso_conn_del(hcon, bt_to_errno(status));
1854         }
1855 }
1856
1857 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1858 {
1859         if (hcon->type != ISO_LINK)
1860                 return;
1861
1862         BT_DBG("hcon %p reason %d", hcon, reason);
1863
1864         iso_conn_del(hcon, bt_to_errno(reason));
1865 }
1866
1867 void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1868 {
1869         struct iso_conn *conn = hcon->iso_data;
1870         __u16 pb, ts, len;
1871
1872         if (!conn)
1873                 goto drop;
1874
1875         pb     = hci_iso_flags_pb(flags);
1876         ts     = hci_iso_flags_ts(flags);
1877
1878         BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
1879
1880         switch (pb) {
1881         case ISO_START:
1882         case ISO_SINGLE:
1883                 if (conn->rx_len) {
1884                         BT_ERR("Unexpected start frame (len %d)", skb->len);
1885                         kfree_skb(conn->rx_skb);
1886                         conn->rx_skb = NULL;
1887                         conn->rx_len = 0;
1888                 }
1889
1890                 if (ts) {
1891                         struct hci_iso_ts_data_hdr *hdr;
1892
1893                         /* TODO: add timestamp to the packet? */
1894                         hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
1895                         if (!hdr) {
1896                                 BT_ERR("Frame is too short (len %d)", skb->len);
1897                                 goto drop;
1898                         }
1899
1900                         len = __le16_to_cpu(hdr->slen);
1901                 } else {
1902                         struct hci_iso_data_hdr *hdr;
1903
1904                         hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
1905                         if (!hdr) {
1906                                 BT_ERR("Frame is too short (len %d)", skb->len);
1907                                 goto drop;
1908                         }
1909
1910                         len = __le16_to_cpu(hdr->slen);
1911                 }
1912
1913                 flags  = hci_iso_data_flags(len);
1914                 len    = hci_iso_data_len(len);
1915
1916                 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
1917                        skb->len, flags);
1918
1919                 if (len == skb->len) {
1920                         /* Complete frame received */
1921                         hci_skb_pkt_status(skb) = flags & 0x03;
1922                         iso_recv_frame(conn, skb);
1923                         return;
1924                 }
1925
1926                 if (pb == ISO_SINGLE) {
1927                         BT_ERR("Frame malformed (len %d, expected len %d)",
1928                                skb->len, len);
1929                         goto drop;
1930                 }
1931
1932                 if (skb->len > len) {
1933                         BT_ERR("Frame is too long (len %d, expected len %d)",
1934                                skb->len, len);
1935                         goto drop;
1936                 }
1937
1938                 /* Allocate skb for the complete frame (with header) */
1939                 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
1940                 if (!conn->rx_skb)
1941                         goto drop;
1942
1943                 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
1944                 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1945                                           skb->len);
1946                 conn->rx_len = len - skb->len;
1947                 break;
1948
1949         case ISO_CONT:
1950                 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
1951                        conn->rx_len);
1952
1953                 if (!conn->rx_len) {
1954                         BT_ERR("Unexpected continuation frame (len %d)",
1955                                skb->len);
1956                         goto drop;
1957                 }
1958
1959                 if (skb->len > conn->rx_len) {
1960                         BT_ERR("Fragment is too long (len %d, expected %d)",
1961                                skb->len, conn->rx_len);
1962                         kfree_skb(conn->rx_skb);
1963                         conn->rx_skb = NULL;
1964                         conn->rx_len = 0;
1965                         goto drop;
1966                 }
1967
1968                 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1969                                           skb->len);
1970                 conn->rx_len -= skb->len;
1971                 return;
1972
1973         case ISO_END:
1974                 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1975                                           skb->len);
1976                 conn->rx_len -= skb->len;
1977
1978                 if (!conn->rx_len) {
1979                         struct sk_buff *rx_skb = conn->rx_skb;
1980
1981                         /* Complete frame received. iso_recv_frame
1982                          * takes ownership of the skb so set the global
1983                          * rx_skb pointer to NULL first.
1984                          */
1985                         conn->rx_skb = NULL;
1986                         iso_recv_frame(conn, rx_skb);
1987                 }
1988                 break;
1989         }
1990
1991 drop:
1992         kfree_skb(skb);
1993 }
1994
1995 static struct hci_cb iso_cb = {
1996         .name           = "ISO",
1997         .connect_cfm    = iso_connect_cfm,
1998         .disconn_cfm    = iso_disconn_cfm,
1999 };
2000
2001 static int iso_debugfs_show(struct seq_file *f, void *p)
2002 {
2003         struct sock *sk;
2004
2005         read_lock(&iso_sk_list.lock);
2006
2007         sk_for_each(sk, &iso_sk_list.head) {
2008                 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
2009                            &iso_pi(sk)->dst, sk->sk_state);
2010         }
2011
2012         read_unlock(&iso_sk_list.lock);
2013
2014         return 0;
2015 }
2016
2017 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2018
2019 static struct dentry *iso_debugfs;
2020
2021 static const struct proto_ops iso_sock_ops = {
2022         .family         = PF_BLUETOOTH,
2023         .owner          = THIS_MODULE,
2024         .release        = iso_sock_release,
2025         .bind           = iso_sock_bind,
2026         .connect        = iso_sock_connect,
2027         .listen         = iso_sock_listen,
2028         .accept         = iso_sock_accept,
2029         .getname        = iso_sock_getname,
2030         .sendmsg        = iso_sock_sendmsg,
2031         .recvmsg        = iso_sock_recvmsg,
2032         .poll           = bt_sock_poll,
2033         .ioctl          = bt_sock_ioctl,
2034         .mmap           = sock_no_mmap,
2035         .socketpair     = sock_no_socketpair,
2036         .shutdown       = iso_sock_shutdown,
2037         .setsockopt     = iso_sock_setsockopt,
2038         .getsockopt     = iso_sock_getsockopt
2039 };
2040
2041 static const struct net_proto_family iso_sock_family_ops = {
2042         .family = PF_BLUETOOTH,
2043         .owner  = THIS_MODULE,
2044         .create = iso_sock_create,
2045 };
2046
2047 static bool iso_inited;
2048
2049 bool iso_enabled(void)
2050 {
2051         return iso_inited;
2052 }
2053
2054 int iso_init(void)
2055 {
2056         int err;
2057
2058         BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2059
2060         if (iso_inited)
2061                 return -EALREADY;
2062
2063         err = proto_register(&iso_proto, 0);
2064         if (err < 0)
2065                 return err;
2066
2067         err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
2068         if (err < 0) {
2069                 BT_ERR("ISO socket registration failed");
2070                 goto error;
2071         }
2072
2073         err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
2074         if (err < 0) {
2075                 BT_ERR("Failed to create ISO proc file");
2076                 bt_sock_unregister(BTPROTO_ISO);
2077                 goto error;
2078         }
2079
2080         BT_INFO("ISO socket layer initialized");
2081
2082         hci_register_cb(&iso_cb);
2083
2084         if (IS_ERR_OR_NULL(bt_debugfs))
2085                 return 0;
2086
2087         if (!iso_debugfs) {
2088                 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
2089                                                   NULL, &iso_debugfs_fops);
2090         }
2091
2092         iso_inited = true;
2093
2094         return 0;
2095
2096 error:
2097         proto_unregister(&iso_proto);
2098         return err;
2099 }
2100
2101 int iso_exit(void)
2102 {
2103         if (!iso_inited)
2104                 return -EALREADY;
2105
2106         bt_procfs_cleanup(&init_net, "iso");
2107
2108         debugfs_remove(iso_debugfs);
2109         iso_debugfs = NULL;
2110
2111         hci_unregister_cb(&iso_cb);
2112
2113         bt_sock_unregister(BTPROTO_ISO);
2114
2115         proto_unregister(&iso_proto);
2116
2117         iso_inited = false;
2118
2119         return 0;
2120 }