include/net/bluetooth/l2cap.h

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4    Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
   5    Copyright (C) 2010 Google Inc.
   6
   7    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License version 2 as
  11    published by the Free Software Foundation;
  12
  13    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  14    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  16    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  17    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  18    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  20    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21
  22    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  23    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  24    SOFTWARE IS DISCLAIMED.
  25 */
  26
  27 #ifndef __L2CAP_H
  28 #define __L2CAP_H
  29
  30 /* L2CAP defaults */
  31 #define L2CAP_DEFAULT_MTU               672
  32 #define L2CAP_DEFAULT_MIN_MTU           48
  33 #define L2CAP_DEFAULT_FLUSH_TO          0xffff
  34 #define L2CAP_DEFAULT_TX_WINDOW         63
  35 #define L2CAP_DEFAULT_MAX_TX            3
  36 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  37 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  38 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1009    /* Sized for 3-DH5 packet */
  39 #define L2CAP_DEFAULT_ACK_TO            200
  40 #define L2CAP_LE_DEFAULT_MTU            23
  41
  42 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
  43 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
  44
  45 /* L2CAP socket address */
  46 struct sockaddr_l2 {
  47         sa_family_t     l2_family;
  48         __le16          l2_psm;
  49         bdaddr_t        l2_bdaddr;
  50         __le16          l2_cid;
  51 };
  52
  53 /* L2CAP socket options */
  54 #define L2CAP_OPTIONS   0x01
  55 struct l2cap_options {
  56         __u16 omtu;
  57         __u16 imtu;
  58         __u16 flush_to;
  59         __u8  mode;
  60         __u8  fcs;
  61         __u8  max_tx;
  62         __u16 txwin_size;
  63 };
  64
  65 #define L2CAP_CONNINFO  0x02
  66 struct l2cap_conninfo {
  67         __u16 hci_handle;
  68         __u8  dev_class[3];
  69 };
  70
  71 #define L2CAP_LM        0x03
  72 #define L2CAP_LM_MASTER         0x0001
  73 #define L2CAP_LM_AUTH           0x0002
  74 #define L2CAP_LM_ENCRYPT        0x0004
  75 #define L2CAP_LM_TRUSTED        0x0008
  76 #define L2CAP_LM_RELIABLE       0x0010
  77 #define L2CAP_LM_SECURE         0x0020
  78
  79 /* L2CAP command codes */
  80 #define L2CAP_COMMAND_REJ       0x01
  81 #define L2CAP_CONN_REQ          0x02
  82 #define L2CAP_CONN_RSP          0x03
  83 #define L2CAP_CONF_REQ          0x04
  84 #define L2CAP_CONF_RSP          0x05
  85 #define L2CAP_DISCONN_REQ       0x06
  86 #define L2CAP_DISCONN_RSP       0x07
  87 #define L2CAP_ECHO_REQ          0x08
  88 #define L2CAP_ECHO_RSP          0x09
  89 #define L2CAP_INFO_REQ          0x0a
  90 #define L2CAP_INFO_RSP          0x0b
  91 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
  92 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
  93
  94 /* L2CAP feature mask */
  95 #define L2CAP_FEAT_FLOWCTL      0x00000001
  96 #define L2CAP_FEAT_RETRANS      0x00000002
  97 #define L2CAP_FEAT_ERTM         0x00000008
  98 #define L2CAP_FEAT_STREAMING    0x00000010
  99 #define L2CAP_FEAT_FCS          0x00000020
 100 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 101
 102 /* L2CAP checksum option */
 103 #define L2CAP_FCS_NONE          0x00
 104 #define L2CAP_FCS_CRC16         0x01
 105
 106 /* L2CAP Control Field bit masks */
 107 #define L2CAP_CTRL_SAR               0xC000
 108 #define L2CAP_CTRL_REQSEQ            0x3F00
 109 #define L2CAP_CTRL_TXSEQ             0x007E
 110 #define L2CAP_CTRL_RETRANS           0x0080
 111 #define L2CAP_CTRL_FINAL             0x0080
 112 #define L2CAP_CTRL_POLL              0x0010
 113 #define L2CAP_CTRL_SUPERVISE         0x000C
 114 #define L2CAP_CTRL_FRAME_TYPE        0x0001 /* I- or S-Frame */
 115
 116 #define L2CAP_CTRL_TXSEQ_SHIFT      1
 117 #define L2CAP_CTRL_REQSEQ_SHIFT     8
 118 #define L2CAP_CTRL_SAR_SHIFT       14
 119
 120 /* L2CAP Supervisory Function */
 121 #define L2CAP_SUPER_RCV_READY           0x0000
 122 #define L2CAP_SUPER_REJECT              0x0004
 123 #define L2CAP_SUPER_RCV_NOT_READY       0x0008
 124 #define L2CAP_SUPER_SELECT_REJECT       0x000C
 125
 126 /* L2CAP Segmentation and Reassembly */
 127 #define L2CAP_SDU_UNSEGMENTED       0x0000
 128 #define L2CAP_SDU_START             0x4000
 129 #define L2CAP_SDU_END               0x8000
 130 #define L2CAP_SDU_CONTINUE          0xC000
 131
 132 /* L2CAP Command rej. reasons */
 133 #define L2CAP_REJ_NOT_UNDERSTOOD      0x0000
 134 #define L2CAP_REJ_MTU_EXCEEDED        0x0001
 135 #define L2CAP_REJ_INVALID_CID         0x0002
 136
 137
 138 /* L2CAP structures */
 139 struct l2cap_hdr {
 140         __le16     len;
 141         __le16     cid;
 142 } __packed;
 143 #define L2CAP_HDR_SIZE          4
 144
 145 struct l2cap_cmd_hdr {
 146         __u8       code;
 147         __u8       ident;
 148         __le16     len;
 149 } __packed;
 150 #define L2CAP_CMD_HDR_SIZE      4
 151
 152 struct l2cap_cmd_rej_unk {
 153         __le16     reason;
 154 } __packed;
 155
 156 struct l2cap_cmd_rej_mtu {
 157         __le16     reason;
 158         __le16     max_mtu;
 159 } __packed;
 160
 161 struct l2cap_cmd_rej_cid {
 162         __le16     reason;
 163         __le16     scid;
 164         __le16     dcid;
 165 } __packed;
 166
 167 struct l2cap_conn_req {
 168         __le16     psm;
 169         __le16     scid;
 170 } __packed;
 171
 172 struct l2cap_conn_rsp {
 173         __le16     dcid;
 174         __le16     scid;
 175         __le16     result;
 176         __le16     status;
 177 } __packed;
 178
 179 /* channel indentifier */
 180 #define L2CAP_CID_SIGNALING     0x0001
 181 #define L2CAP_CID_CONN_LESS     0x0002
 182 #define L2CAP_CID_LE_DATA       0x0004
 183 #define L2CAP_CID_LE_SIGNALING  0x0005
 184 #define L2CAP_CID_SMP           0x0006
 185 #define L2CAP_CID_DYN_START     0x0040
 186 #define L2CAP_CID_DYN_END       0xffff
 187
 188 /* connect result */
 189 #define L2CAP_CR_SUCCESS        0x0000
 190 #define L2CAP_CR_PEND           0x0001
 191 #define L2CAP_CR_BAD_PSM        0x0002
 192 #define L2CAP_CR_SEC_BLOCK      0x0003
 193 #define L2CAP_CR_NO_MEM         0x0004
 194
 195 /* connect status */
 196 #define L2CAP_CS_NO_INFO        0x0000
 197 #define L2CAP_CS_AUTHEN_PEND    0x0001
 198 #define L2CAP_CS_AUTHOR_PEND    0x0002
 199
 200 struct l2cap_conf_req {
 201         __le16     dcid;
 202         __le16     flags;
 203         __u8       data[0];
 204 } __packed;
 205
 206 struct l2cap_conf_rsp {
 207         __le16     scid;
 208         __le16     flags;
 209         __le16     result;
 210         __u8       data[0];
 211 } __packed;
 212
 213 #define L2CAP_CONF_SUCCESS      0x0000
 214 #define L2CAP_CONF_UNACCEPT     0x0001
 215 #define L2CAP_CONF_REJECT       0x0002
 216 #define L2CAP_CONF_UNKNOWN      0x0003
 217
 218 struct l2cap_conf_opt {
 219         __u8       type;
 220         __u8       len;
 221         __u8       val[0];
 222 } __packed;
 223 #define L2CAP_CONF_OPT_SIZE     2
 224
 225 #define L2CAP_CONF_HINT         0x80
 226 #define L2CAP_CONF_MASK         0x7f
 227
 228 #define L2CAP_CONF_MTU          0x01
 229 #define L2CAP_CONF_FLUSH_TO     0x02
 230 #define L2CAP_CONF_QOS          0x03
 231 #define L2CAP_CONF_RFC          0x04
 232 #define L2CAP_CONF_FCS          0x05
 233
 234 #define L2CAP_CONF_MAX_SIZE     22
 235
 236 struct l2cap_conf_rfc {
 237         __u8       mode;
 238         __u8       txwin_size;
 239         __u8       max_transmit;
 240         __le16     retrans_timeout;
 241         __le16     monitor_timeout;
 242         __le16     max_pdu_size;
 243 } __packed;
 244
 245 #define L2CAP_MODE_BASIC        0x00
 246 #define L2CAP_MODE_RETRANS      0x01
 247 #define L2CAP_MODE_FLOWCTL      0x02
 248 #define L2CAP_MODE_ERTM         0x03
 249 #define L2CAP_MODE_STREAMING    0x04
 250
 251 struct l2cap_disconn_req {
 252         __le16     dcid;
 253         __le16     scid;
 254 } __packed;
 255
 256 struct l2cap_disconn_rsp {
 257         __le16     dcid;
 258         __le16     scid;
 259 } __packed;
 260
 261 struct l2cap_info_req {
 262         __le16      type;
 263 } __packed;
 264
 265 struct l2cap_info_rsp {
 266         __le16      type;
 267         __le16      result;
 268         __u8        data[0];
 269 } __packed;
 270
 271 /* info type */
 272 #define L2CAP_IT_CL_MTU     0x0001
 273 #define L2CAP_IT_FEAT_MASK  0x0002
 274 #define L2CAP_IT_FIXED_CHAN 0x0003
 275
 276 /* info result */
 277 #define L2CAP_IR_SUCCESS    0x0000
 278 #define L2CAP_IR_NOTSUPP    0x0001
 279
 280 struct l2cap_conn_param_update_req {
 281         __le16      min;
 282         __le16      max;
 283         __le16      latency;
 284         __le16      to_multiplier;
 285 } __packed;
 286
 287 struct l2cap_conn_param_update_rsp {
 288         __le16      result;
 289 } __packed;
 290
 291 /* Connection Parameters result */
 292 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 293 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 294
 295 /* ----- L2CAP channels and connections ----- */
 296 struct srej_list {
 297         __u8    tx_seq;
 298         struct list_head list;
 299 };
 300
 301 struct l2cap_chan {
 302         struct sock *sk;
 303
 304         struct l2cap_conn       *conn;
 305
 306         __u8            state;
 307
 308         atomic_t        refcnt;
 309
 310         __le16          psm;
 311         __u16           dcid;
 312         __u16           scid;
 313
 314         __u16           imtu;
 315         __u16           omtu;
 316         __u16           flush_to;
 317         __u8            mode;
 318         __u8            chan_type;
 319
 320         __le16          sport;
 321
 322         __u8            sec_level;
 323         __u8            role_switch;
 324         __u8            force_reliable;
 325         __u8            flushable;
 326         __u8            force_active;
 327
 328         __u8            ident;
 329
 330         __u8            conf_req[64];
 331         __u8            conf_len;
 332         __u8            num_conf_req;
 333         __u8            num_conf_rsp;
 334
 335         __u8            fcs;
 336
 337         __u8            tx_win;
 338         __u8            max_tx;
 339         __u16           retrans_timeout;
 340         __u16           monitor_timeout;
 341         __u16           mps;
 342
 343         unsigned long   conf_state;
 344         unsigned long   conn_state;
 345
 346         __u8            next_tx_seq;
 347         __u8            expected_ack_seq;
 348         __u8            expected_tx_seq;
 349         __u8            buffer_seq;
 350         __u8            buffer_seq_srej;
 351         __u8            srej_save_reqseq;
 352         __u8            frames_sent;
 353         __u8            unacked_frames;
 354         __u8            retry_count;
 355         __u8            num_acked;
 356         __u16           sdu_len;
 357         struct sk_buff  *sdu;
 358         struct sk_buff  *sdu_last_frag;
 359
 360         __u8            remote_tx_win;
 361         __u8            remote_max_tx;
 362         __u16           remote_mps;
 363
 364         struct timer_list       chan_timer;
 365         struct timer_list       retrans_timer;
 366         struct timer_list       monitor_timer;
 367         struct timer_list       ack_timer;
 368         struct sk_buff          *tx_send_head;
 369         struct sk_buff_head     tx_q;
 370         struct sk_buff_head     srej_q;
 371         struct list_head        srej_l;
 372
 373         struct list_head list;
 374         struct list_head global_l;
 375
 376         void            *data;
 377         struct l2cap_ops *ops;
 378 };
 379
 380 struct l2cap_ops {
 381         char            *name;
 382
 383         struct l2cap_chan       *(*new_connection) (void *data);
 384         int                     (*recv) (void *data, struct sk_buff *skb);
 385         void                    (*close) (void *data);
 386         void                    (*state_change) (void *data, int state);
 387 };
 388
 389 struct l2cap_conn {
 390         struct hci_conn *hcon;
 391
 392         bdaddr_t        *dst;
 393         bdaddr_t        *src;
 394
 395         unsigned int    mtu;
 396
 397         __u32           feat_mask;
 398
 399         __u8            info_state;
 400         __u8            info_ident;
 401
 402         struct timer_list info_timer;
 403
 404         spinlock_t      lock;
 405
 406         struct sk_buff *rx_skb;
 407         __u32           rx_len;
 408         __u8            tx_ident;
 409
 410         __u8            disc_reason;
 411
 412         struct timer_list security_timer;
 413         struct smp_chan *smp_chan;
 414
 415         struct list_head chan_l;
 416         rwlock_t        chan_lock;
 417 };
 418
 419 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 420 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 421 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 422
 423 #define L2CAP_CHAN_RAW                  1
 424 #define L2CAP_CHAN_CONN_LESS            2
 425 #define L2CAP_CHAN_CONN_ORIENTED        3
 426
 427 /* ----- L2CAP socket info ----- */
 428 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 429
 430 struct l2cap_pinfo {
 431         struct bt_sock  bt;
 432         struct l2cap_chan       *chan;
 433         struct sk_buff  *rx_busy_skb;
 434 };
 435
 436 enum {
 437         CONF_REQ_SENT,
 438         CONF_INPUT_DONE,
 439         CONF_OUTPUT_DONE,
 440         CONF_MTU_DONE,
 441         CONF_MODE_DONE,
 442         CONF_CONNECT_PEND,
 443         CONF_NO_FCS_RECV,
 444         CONF_STATE2_DEVICE,
 445 };
 446
 447 #define L2CAP_CONF_MAX_CONF_REQ 2
 448 #define L2CAP_CONF_MAX_CONF_RSP 2
 449
 450 enum {
 451         CONN_SREJ_SENT,
 452         CONN_WAIT_F,
 453         CONN_SREJ_ACT,
 454         CONN_SEND_PBIT,
 455         CONN_REMOTE_BUSY,
 456         CONN_LOCAL_BUSY,
 457         CONN_REJ_ACT,
 458         CONN_SEND_FBIT,
 459         CONN_RNR_SENT,
 460 };
 461
 462 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 463 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 464 #define __set_retrans_timer(c) l2cap_set_timer(c, &c->retrans_timer, \
 465                 L2CAP_DEFAULT_RETRANS_TO);
 466 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 467 #define __set_monitor_timer(c) l2cap_set_timer(c, &c->monitor_timer, \
 468                 L2CAP_DEFAULT_MONITOR_TO);
 469 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 470 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 471                 L2CAP_DEFAULT_ACK_TO);
 472 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 473
 474 static inline int l2cap_tx_window_full(struct l2cap_chan *ch)
 475 {
 476         int sub;
 477
 478         sub = (ch->next_tx_seq - ch->expected_ack_seq) % 64;
 479
 480         if (sub < 0)
 481                 sub += 64;
 482
 483         return sub == ch->remote_tx_win;
 484 }
 485
 486 #define __get_txseq(ctrl)       (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1)
 487 #define __get_reqseq(ctrl)      (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8)
 488 #define __is_iframe(ctrl)       (!((ctrl) & L2CAP_CTRL_FRAME_TYPE))
 489 #define __is_sframe(ctrl)       ((ctrl) & L2CAP_CTRL_FRAME_TYPE)
 490 #define __is_sar_start(ctrl)    (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START)
 491
 492 extern int disable_ertm;
 493
 494 int l2cap_init_sockets(void);
 495 void l2cap_cleanup_sockets(void);
 496
 497 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 498 int __l2cap_wait_ack(struct sock *sk);
 499
 500 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 501 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 502
 503 struct l2cap_chan *l2cap_chan_create(struct sock *sk);
 504 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 505 void l2cap_chan_destroy(struct l2cap_chan *chan);
 506 int l2cap_chan_connect(struct l2cap_chan *chan);
 507 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
 508 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 509
 510 #endif /* __L2CAP_H */