include/net/bluetooth/bluetooth.h

   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 #ifndef __BLUETOOTH_H
  26 #define __BLUETOOTH_H
  27
  28 #include <linux/poll.h>
  29 #include <net/sock.h>
  30 #include <linux/seq_file.h>
  31
  32 #define BT_SUBSYS_VERSION       2
  33 #define BT_SUBSYS_REVISION      22
  34
  35 #ifndef AF_BLUETOOTH
  36 #define AF_BLUETOOTH    31
  37 #define PF_BLUETOOTH    AF_BLUETOOTH
  38 #endif
  39
  40 /* Bluetooth versions */
  41 #define BLUETOOTH_VER_1_1       1
  42 #define BLUETOOTH_VER_1_2       2
  43 #define BLUETOOTH_VER_2_0       3
  44
  45 /* Reserv for core and drivers use */
  46 #define BT_SKB_RESERVE  8
  47
  48 #define BTPROTO_L2CAP   0
  49 #define BTPROTO_HCI     1
  50 #define BTPROTO_SCO     2
  51 #define BTPROTO_RFCOMM  3
  52 #define BTPROTO_BNEP    4
  53 #define BTPROTO_CMTP    5
  54 #define BTPROTO_HIDP    6
  55 #define BTPROTO_AVDTP   7
  56
  57 #define SOL_HCI         0
  58 #define SOL_L2CAP       6
  59 #define SOL_SCO         17
  60 #define SOL_RFCOMM      18
  61
  62 #define BT_SECURITY     4
  63 struct bt_security {
  64         __u8 level;
  65         __u8 key_size;
  66 };
  67 #define BT_SECURITY_SDP         0
  68 #define BT_SECURITY_LOW         1
  69 #define BT_SECURITY_MEDIUM      2
  70 #define BT_SECURITY_HIGH        3
  71 #define BT_SECURITY_FIPS        4
  72
  73 #define BT_DEFER_SETUP  7
  74
  75 #define BT_FLUSHABLE    8
  76
  77 #define BT_FLUSHABLE_OFF        0
  78 #define BT_FLUSHABLE_ON         1
  79
  80 #define BT_POWER        9
  81 struct bt_power {
  82         __u8 force_active;
  83 };
  84 #define BT_POWER_FORCE_ACTIVE_OFF 0
  85 #define BT_POWER_FORCE_ACTIVE_ON  1
  86
  87 #define BT_CHANNEL_POLICY       10
  88
  89 /* BR/EDR only (default policy)
  90  *   AMP controllers cannot be used.
  91  *   Channel move requests from the remote device are denied.
  92  *   If the L2CAP channel is currently using AMP, move the channel to BR/EDR.
  93  */
  94 #define BT_CHANNEL_POLICY_BREDR_ONLY            0
  95
  96 /* BR/EDR Preferred
  97  *   Allow use of AMP controllers.
  98  *   If the L2CAP channel is currently on AMP, move it to BR/EDR.
  99  *   Channel move requests from the remote device are allowed.
 100  */
 101 #define BT_CHANNEL_POLICY_BREDR_PREFERRED       1
 102
 103 /* AMP Preferred
 104  *   Allow use of AMP controllers
 105  *   If the L2CAP channel is currently on BR/EDR and AMP controller
 106  *     resources are available, initiate a channel move to AMP.
 107  *   Channel move requests from the remote device are allowed.
 108  *   If the L2CAP socket has not been connected yet, try to create
 109  *     and configure the channel directly on an AMP controller rather
 110  *     than BR/EDR.
 111  */
 112 #define BT_CHANNEL_POLICY_AMP_PREFERRED         2
 113
 114 #define BT_VOICE                11
 115 struct bt_voice {
 116         __u16 setting;
 117 };
 118
 119 #define BT_VOICE_TRANSPARENT                    0x0003
 120 #define BT_VOICE_CVSD_16BIT                     0x0060
 121
 122 #define BT_SNDMTU               12
 123 #define BT_RCVMTU               13
 124
 125 __printf(1, 2)
 126 void bt_info(const char *fmt, ...);
 127 __printf(1, 2)
 128 void bt_warn(const char *fmt, ...);
 129 __printf(1, 2)
 130 void bt_err(const char *fmt, ...);
 131 __printf(1, 2)
 132 void bt_err_ratelimited(const char *fmt, ...);
 133
 134 #define BT_INFO(fmt, ...)       bt_info(fmt "\n", ##__VA_ARGS__)
 135 #define BT_WARN(fmt, ...)       bt_warn(fmt "\n", ##__VA_ARGS__)
 136 #define BT_ERR(fmt, ...)        bt_err(fmt "\n", ##__VA_ARGS__)
 137 #define BT_DBG(fmt, ...)        pr_debug(fmt "\n", ##__VA_ARGS__)
 138
 139 #define BT_ERR_RATELIMITED(fmt, ...) bt_err_ratelimited(fmt "\n", ##__VA_ARGS__)
 140
 141 #define bt_dev_info(hdev, fmt, ...)                             \
 142         BT_INFO("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
 143 #define bt_dev_warn(hdev, fmt, ...)                             \
 144         BT_WARN("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
 145 #define bt_dev_err(hdev, fmt, ...)                              \
 146         BT_ERR("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
 147 #define bt_dev_dbg(hdev, fmt, ...)                              \
 148         BT_DBG("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
 149
 150 #define bt_dev_err_ratelimited(hdev, fmt, ...)                  \
 151         BT_ERR_RATELIMITED("%s: " fmt, (hdev)->name, ##__VA_ARGS__)
 152
 153 /* Connection and socket states */
 154 enum {
 155         BT_CONNECTED = 1, /* Equal to TCP_ESTABLISHED to make net code happy */
 156         BT_OPEN,
 157         BT_BOUND,
 158         BT_LISTEN,
 159         BT_CONNECT,
 160         BT_CONNECT2,
 161         BT_CONFIG,
 162         BT_DISCONN,
 163         BT_CLOSED
 164 };
 165
 166 /* If unused will be removed by compiler */
 167 static inline const char *state_to_string(int state)
 168 {
 169         switch (state) {
 170         case BT_CONNECTED:
 171                 return "BT_CONNECTED";
 172         case BT_OPEN:
 173                 return "BT_OPEN";
 174         case BT_BOUND:
 175                 return "BT_BOUND";
 176         case BT_LISTEN:
 177                 return "BT_LISTEN";
 178         case BT_CONNECT:
 179                 return "BT_CONNECT";
 180         case BT_CONNECT2:
 181                 return "BT_CONNECT2";
 182         case BT_CONFIG:
 183                 return "BT_CONFIG";
 184         case BT_DISCONN:
 185                 return "BT_DISCONN";
 186         case BT_CLOSED:
 187                 return "BT_CLOSED";
 188         }
 189
 190         return "invalid state";
 191 }
 192
 193 /* BD Address */
 194 typedef struct {
 195         __u8 b[6];
 196 } __packed bdaddr_t;
 197
 198 /* BD Address type */
 199 #define BDADDR_BREDR            0x00
 200 #define BDADDR_LE_PUBLIC        0x01
 201 #define BDADDR_LE_RANDOM        0x02
 202
 203 static inline bool bdaddr_type_is_valid(u8 type)
 204 {
 205         switch (type) {
 206         case BDADDR_BREDR:
 207         case BDADDR_LE_PUBLIC:
 208         case BDADDR_LE_RANDOM:
 209                 return true;
 210         }
 211
 212         return false;
 213 }
 214
 215 static inline bool bdaddr_type_is_le(u8 type)
 216 {
 217         switch (type) {
 218         case BDADDR_LE_PUBLIC:
 219         case BDADDR_LE_RANDOM:
 220                 return true;
 221         }
 222
 223         return false;
 224 }
 225
 226 #define BDADDR_ANY  (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})
 227 #define BDADDR_NONE (&(bdaddr_t) {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}})
 228
 229 /* Copy, swap, convert BD Address */
 230 static inline int bacmp(const bdaddr_t *ba1, const bdaddr_t *ba2)
 231 {
 232         return memcmp(ba1, ba2, sizeof(bdaddr_t));
 233 }
 234 static inline void bacpy(bdaddr_t *dst, const bdaddr_t *src)
 235 {
 236         memcpy(dst, src, sizeof(bdaddr_t));
 237 }
 238
 239 void baswap(bdaddr_t *dst, const bdaddr_t *src);
 240
 241 /* Common socket structures and functions */
 242
 243 #define bt_sk(__sk) ((struct bt_sock *) __sk)
 244
 245 struct bt_sock {
 246         struct sock sk;
 247         struct list_head accept_q;
 248         struct sock *parent;
 249         unsigned long flags;
 250         void (*skb_msg_name)(struct sk_buff *, void *, int *);
 251 };
 252
 253 enum {
 254         BT_SK_DEFER_SETUP,
 255         BT_SK_SUSPEND,
 256 };
 257
 258 struct bt_sock_list {
 259         struct hlist_head head;
 260         rwlock_t          lock;
 261 #ifdef CONFIG_PROC_FS
 262         int (* custom_seq_show)(struct seq_file *, void *);
 263 #endif
 264 };
 265
 266 int  bt_sock_register(int proto, const struct net_proto_family *ops);
 267 void bt_sock_unregister(int proto);
 268 void bt_sock_link(struct bt_sock_list *l, struct sock *s);
 269 void bt_sock_unlink(struct bt_sock_list *l, struct sock *s);
 270 int  bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 271                      int flags);
 272 int  bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
 273                             size_t len, int flags);
 274 __poll_t bt_sock_poll(struct file *file, struct socket *sock, poll_table *wait);
 275 int  bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 276 int  bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo);
 277 int  bt_sock_wait_ready(struct sock *sk, unsigned long flags);
 278
 279 void bt_accept_enqueue(struct sock *parent, struct sock *sk);
 280 void bt_accept_unlink(struct sock *sk);
 281 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock);
 282
 283 /* Skb helpers */
 284 struct l2cap_ctrl {
 285         u8      sframe:1,
 286                 poll:1,
 287                 final:1,
 288                 fcs:1,
 289                 sar:2,
 290                 super:2;
 291
 292         u16     reqseq;
 293         u16     txseq;
 294         u8      retries;
 295         __le16  psm;
 296         bdaddr_t bdaddr;
 297         struct l2cap_chan *chan;
 298 };
 299
 300 struct hci_dev;
 301
 302 typedef void (*hci_req_complete_t)(struct hci_dev *hdev, u8 status, u16 opcode);
 303 typedef void (*hci_req_complete_skb_t)(struct hci_dev *hdev, u8 status,
 304                                        u16 opcode, struct sk_buff *skb);
 305
 306 #define HCI_REQ_START   BIT(0)
 307 #define HCI_REQ_SKB     BIT(1)
 308
 309 struct hci_ctrl {
 310         u16 opcode;
 311         u8 req_flags;
 312         u8 req_event;
 313         union {
 314                 hci_req_complete_t req_complete;
 315                 hci_req_complete_skb_t req_complete_skb;
 316         };
 317 };
 318
 319 struct bt_skb_cb {
 320         u8 pkt_type;
 321         u8 force_active;
 322         u16 expect;
 323         u8 incoming:1;
 324         union {
 325                 struct l2cap_ctrl l2cap;
 326                 struct hci_ctrl hci;
 327         };
 328 };
 329 #define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))
 330
 331 #define hci_skb_pkt_type(skb) bt_cb((skb))->pkt_type
 332 #define hci_skb_expect(skb) bt_cb((skb))->expect
 333 #define hci_skb_opcode(skb) bt_cb((skb))->hci.opcode
 334
 335 static inline struct sk_buff *bt_skb_alloc(unsigned int len, gfp_t how)
 336 {
 337         struct sk_buff *skb;
 338
 339         skb = alloc_skb(len + BT_SKB_RESERVE, how);
 340         if (skb)
 341                 skb_reserve(skb, BT_SKB_RESERVE);
 342         return skb;
 343 }
 344
 345 static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk,
 346                                         unsigned long len, int nb, int *err)
 347 {
 348         struct sk_buff *skb;
 349
 350         skb = sock_alloc_send_skb(sk, len + BT_SKB_RESERVE, nb, err);
 351         if (skb)
 352                 skb_reserve(skb, BT_SKB_RESERVE);
 353
 354         if (!skb && *err)
 355                 return NULL;
 356
 357         *err = sock_error(sk);
 358         if (*err)
 359                 goto out;
 360
 361         if (sk->sk_shutdown) {
 362                 *err = -ECONNRESET;
 363                 goto out;
 364         }
 365
 366         return skb;
 367
 368 out:
 369         kfree_skb(skb);
 370         return NULL;
 371 }
 372
 373 int bt_to_errno(u16 code);
 374
 375 void hci_sock_set_flag(struct sock *sk, int nr);
 376 void hci_sock_clear_flag(struct sock *sk, int nr);
 377 int hci_sock_test_flag(struct sock *sk, int nr);
 378 unsigned short hci_sock_get_channel(struct sock *sk);
 379 u32 hci_sock_get_cookie(struct sock *sk);
 380
 381 int hci_sock_init(void);
 382 void hci_sock_cleanup(void);
 383
 384 int bt_sysfs_init(void);
 385 void bt_sysfs_cleanup(void);
 386
 387 int bt_procfs_init(struct net *net, const char *name,
 388                    struct bt_sock_list *sk_list,
 389                    int (*seq_show)(struct seq_file *, void *));
 390 void bt_procfs_cleanup(struct net *net, const char *name);
 391
 392 extern struct dentry *bt_debugfs;
 393
 394 int l2cap_init(void);
 395 void l2cap_exit(void);
 396
 397 #if IS_ENABLED(CONFIG_BT_BREDR)
 398 int sco_init(void);
 399 void sco_exit(void);
 400 #else
 401 static inline int sco_init(void)
 402 {
 403         return 0;
 404 }
 405
 406 static inline void sco_exit(void)
 407 {
 408 }
 409 #endif
 410
 411 int mgmt_init(void);
 412 void mgmt_exit(void);
 413
 414 void bt_sock_reclassify_lock(struct sock *sk, int proto);
 415
 416 #endif /* __BLUETOOTH_H */