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 #include <asm/unaligned.h>
  31
  32 /* L2CAP defaults */
  33 #define L2CAP_DEFAULT_MTU               672
  34 #define L2CAP_DEFAULT_MIN_MTU           48
  35 #define L2CAP_DEFAULT_FLUSH_TO          0xffff
  36 #define L2CAP_DEFAULT_TX_WINDOW         63
  37 #define L2CAP_DEFAULT_EXT_WINDOW        0x3FFF
  38 #define L2CAP_DEFAULT_MAX_TX            3
  39 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  40 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  41 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1009    /* Sized for 3-DH5 packet */
  42 #define L2CAP_DEFAULT_ACK_TO            200
  43 #define L2CAP_LE_DEFAULT_MTU            23
  44 #define L2CAP_DEFAULT_MAX_SDU_SIZE      0xFFFF
  45 #define L2CAP_DEFAULT_SDU_ITIME         0xFFFFFFFF
  46 #define L2CAP_DEFAULT_ACC_LAT           0xFFFFFFFF
  47
  48 #define L2CAP_DISC_TIMEOUT              msecs_to_jiffies(100)
  49 #define L2CAP_DISC_REJ_TIMEOUT          msecs_to_jiffies(5000)
  50 #define L2CAP_ENC_TIMEOUT               msecs_to_jiffies(5000)
  51 #define L2CAP_CONN_TIMEOUT              msecs_to_jiffies(40000)
  52 #define L2CAP_INFO_TIMEOUT              msecs_to_jiffies(4000)
  53
  54 /* L2CAP socket address */
  55 struct sockaddr_l2 {
  56         sa_family_t     l2_family;
  57         __le16          l2_psm;
  58         bdaddr_t        l2_bdaddr;
  59         __le16          l2_cid;
  60 };
  61
  62 /* L2CAP socket options */
  63 #define L2CAP_OPTIONS   0x01
  64 struct l2cap_options {
  65         __u16 omtu;
  66         __u16 imtu;
  67         __u16 flush_to;
  68         __u8  mode;
  69         __u8  fcs;
  70         __u8  max_tx;
  71         __u16 txwin_size;
  72 };
  73
  74 #define L2CAP_CONNINFO  0x02
  75 struct l2cap_conninfo {
  76         __u16 hci_handle;
  77         __u8  dev_class[3];
  78 };
  79
  80 #define L2CAP_LM        0x03
  81 #define L2CAP_LM_MASTER         0x0001
  82 #define L2CAP_LM_AUTH           0x0002
  83 #define L2CAP_LM_ENCRYPT        0x0004
  84 #define L2CAP_LM_TRUSTED        0x0008
  85 #define L2CAP_LM_RELIABLE       0x0010
  86 #define L2CAP_LM_SECURE         0x0020
  87
  88 /* L2CAP command codes */
  89 #define L2CAP_COMMAND_REJ       0x01
  90 #define L2CAP_CONN_REQ          0x02
  91 #define L2CAP_CONN_RSP          0x03
  92 #define L2CAP_CONF_REQ          0x04
  93 #define L2CAP_CONF_RSP          0x05
  94 #define L2CAP_DISCONN_REQ       0x06
  95 #define L2CAP_DISCONN_RSP       0x07
  96 #define L2CAP_ECHO_REQ          0x08
  97 #define L2CAP_ECHO_RSP          0x09
  98 #define L2CAP_INFO_REQ          0x0a
  99 #define L2CAP_INFO_RSP          0x0b
 100 #define L2CAP_CREATE_CHAN_REQ   0x0c
 101 #define L2CAP_CREATE_CHAN_RSP   0x0d
 102 #define L2CAP_MOVE_CHAN_REQ     0x0e
 103 #define L2CAP_MOVE_CHAN_RSP     0x0f
 104 #define L2CAP_MOVE_CHAN_CFM     0x10
 105 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
 106 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
 107 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
 108
 109 /* L2CAP extended feature mask */
 110 #define L2CAP_FEAT_FLOWCTL      0x00000001
 111 #define L2CAP_FEAT_RETRANS      0x00000002
 112 #define L2CAP_FEAT_BIDIR_QOS    0x00000004
 113 #define L2CAP_FEAT_ERTM         0x00000008
 114 #define L2CAP_FEAT_STREAMING    0x00000010
 115 #define L2CAP_FEAT_FCS          0x00000020
 116 #define L2CAP_FEAT_EXT_FLOW     0x00000040
 117 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 118 #define L2CAP_FEAT_EXT_WINDOW   0x00000100
 119 #define L2CAP_FEAT_UCD          0x00000200
 120
 121 /* L2CAP checksum option */
 122 #define L2CAP_FCS_NONE          0x00
 123 #define L2CAP_FCS_CRC16         0x01
 124
 125 /* L2CAP fixed channels */
 126 #define L2CAP_FC_L2CAP          0x02
 127 #define L2CAP_FC_A2MP           0x08
 128
 129 /* L2CAP Control Field bit masks */
 130 #define L2CAP_CTRL_SAR                  0xC000
 131 #define L2CAP_CTRL_REQSEQ               0x3F00
 132 #define L2CAP_CTRL_TXSEQ                0x007E
 133 #define L2CAP_CTRL_SUPERVISE            0x000C
 134
 135 #define L2CAP_CTRL_RETRANS              0x0080
 136 #define L2CAP_CTRL_FINAL                0x0080
 137 #define L2CAP_CTRL_POLL                 0x0010
 138 #define L2CAP_CTRL_FRAME_TYPE           0x0001 /* I- or S-Frame */
 139
 140 #define L2CAP_CTRL_TXSEQ_SHIFT          1
 141 #define L2CAP_CTRL_SUPER_SHIFT          2
 142 #define L2CAP_CTRL_REQSEQ_SHIFT         8
 143 #define L2CAP_CTRL_SAR_SHIFT            14
 144
 145 /* L2CAP Extended Control Field bit mask */
 146 #define L2CAP_EXT_CTRL_TXSEQ            0xFFFC0000
 147 #define L2CAP_EXT_CTRL_SAR              0x00030000
 148 #define L2CAP_EXT_CTRL_SUPERVISE        0x00030000
 149 #define L2CAP_EXT_CTRL_REQSEQ           0x0000FFFC
 150
 151 #define L2CAP_EXT_CTRL_POLL             0x00040000
 152 #define L2CAP_EXT_CTRL_FINAL            0x00000002
 153 #define L2CAP_EXT_CTRL_FRAME_TYPE       0x00000001 /* I- or S-Frame */
 154
 155 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT     2
 156 #define L2CAP_EXT_CTRL_SAR_SHIFT        16
 157 #define L2CAP_EXT_CTRL_SUPER_SHIFT      16
 158 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT      18
 159
 160 /* L2CAP Supervisory Function */
 161 #define L2CAP_SUPER_RR          0x00
 162 #define L2CAP_SUPER_REJ         0x01
 163 #define L2CAP_SUPER_RNR         0x02
 164 #define L2CAP_SUPER_SREJ        0x03
 165
 166 /* L2CAP Segmentation and Reassembly */
 167 #define L2CAP_SAR_UNSEGMENTED   0x00
 168 #define L2CAP_SAR_START         0x01
 169 #define L2CAP_SAR_END           0x02
 170 #define L2CAP_SAR_CONTINUE      0x03
 171
 172 /* L2CAP Command rej. reasons */
 173 #define L2CAP_REJ_NOT_UNDERSTOOD        0x0000
 174 #define L2CAP_REJ_MTU_EXCEEDED          0x0001
 175 #define L2CAP_REJ_INVALID_CID           0x0002
 176
 177 /* L2CAP structures */
 178 struct l2cap_hdr {
 179         __le16     len;
 180         __le16     cid;
 181 } __packed;
 182 #define L2CAP_HDR_SIZE          4
 183 #define L2CAP_ENH_HDR_SIZE      6
 184 #define L2CAP_EXT_HDR_SIZE      8
 185
 186 #define L2CAP_FCS_SIZE          2
 187 #define L2CAP_SDULEN_SIZE       2
 188 #define L2CAP_PSMLEN_SIZE       2
 189
 190 struct l2cap_cmd_hdr {
 191         __u8       code;
 192         __u8       ident;
 193         __le16     len;
 194 } __packed;
 195 #define L2CAP_CMD_HDR_SIZE      4
 196
 197 struct l2cap_cmd_rej_unk {
 198         __le16     reason;
 199 } __packed;
 200
 201 struct l2cap_cmd_rej_mtu {
 202         __le16     reason;
 203         __le16     max_mtu;
 204 } __packed;
 205
 206 struct l2cap_cmd_rej_cid {
 207         __le16     reason;
 208         __le16     scid;
 209         __le16     dcid;
 210 } __packed;
 211
 212 struct l2cap_conn_req {
 213         __le16     psm;
 214         __le16     scid;
 215 } __packed;
 216
 217 struct l2cap_conn_rsp {
 218         __le16     dcid;
 219         __le16     scid;
 220         __le16     result;
 221         __le16     status;
 222 } __packed;
 223
 224 /* channel indentifier */
 225 #define L2CAP_CID_SIGNALING     0x0001
 226 #define L2CAP_CID_CONN_LESS     0x0002
 227 #define L2CAP_CID_LE_DATA       0x0004
 228 #define L2CAP_CID_LE_SIGNALING  0x0005
 229 #define L2CAP_CID_SMP           0x0006
 230 #define L2CAP_CID_DYN_START     0x0040
 231 #define L2CAP_CID_DYN_END       0xffff
 232
 233 /* connect/create channel results */
 234 #define L2CAP_CR_SUCCESS        0x0000
 235 #define L2CAP_CR_PEND           0x0001
 236 #define L2CAP_CR_BAD_PSM        0x0002
 237 #define L2CAP_CR_SEC_BLOCK      0x0003
 238 #define L2CAP_CR_NO_MEM         0x0004
 239 #define L2CAP_CR_BAD_AMP        0x0005
 240
 241 /* connect/create channel status */
 242 #define L2CAP_CS_NO_INFO        0x0000
 243 #define L2CAP_CS_AUTHEN_PEND    0x0001
 244 #define L2CAP_CS_AUTHOR_PEND    0x0002
 245
 246 struct l2cap_conf_req {
 247         __le16     dcid;
 248         __le16     flags;
 249         __u8       data[0];
 250 } __packed;
 251
 252 struct l2cap_conf_rsp {
 253         __le16     scid;
 254         __le16     flags;
 255         __le16     result;
 256         __u8       data[0];
 257 } __packed;
 258
 259 #define L2CAP_CONF_SUCCESS      0x0000
 260 #define L2CAP_CONF_UNACCEPT     0x0001
 261 #define L2CAP_CONF_REJECT       0x0002
 262 #define L2CAP_CONF_UNKNOWN      0x0003
 263 #define L2CAP_CONF_PENDING      0x0004
 264 #define L2CAP_CONF_EFS_REJECT   0x0005
 265
 266 struct l2cap_conf_opt {
 267         __u8       type;
 268         __u8       len;
 269         __u8       val[0];
 270 } __packed;
 271 #define L2CAP_CONF_OPT_SIZE     2
 272
 273 #define L2CAP_CONF_HINT         0x80
 274 #define L2CAP_CONF_MASK         0x7f
 275
 276 #define L2CAP_CONF_MTU          0x01
 277 #define L2CAP_CONF_FLUSH_TO     0x02
 278 #define L2CAP_CONF_QOS          0x03
 279 #define L2CAP_CONF_RFC          0x04
 280 #define L2CAP_CONF_FCS          0x05
 281 #define L2CAP_CONF_EFS          0x06
 282 #define L2CAP_CONF_EWS          0x07
 283
 284 #define L2CAP_CONF_MAX_SIZE     22
 285
 286 struct l2cap_conf_rfc {
 287         __u8       mode;
 288         __u8       txwin_size;
 289         __u8       max_transmit;
 290         __le16     retrans_timeout;
 291         __le16     monitor_timeout;
 292         __le16     max_pdu_size;
 293 } __packed;
 294
 295 #define L2CAP_MODE_BASIC        0x00
 296 #define L2CAP_MODE_RETRANS      0x01
 297 #define L2CAP_MODE_FLOWCTL      0x02
 298 #define L2CAP_MODE_ERTM         0x03
 299 #define L2CAP_MODE_STREAMING    0x04
 300
 301 struct l2cap_conf_efs {
 302         __u8    id;
 303         __u8    stype;
 304         __le16  msdu;
 305         __le32  sdu_itime;
 306         __le32  acc_lat;
 307         __le32  flush_to;
 308 } __packed;
 309
 310 #define L2CAP_SERV_NOTRAFIC     0x00
 311 #define L2CAP_SERV_BESTEFFORT   0x01
 312 #define L2CAP_SERV_GUARANTEED   0x02
 313
 314 #define L2CAP_BESTEFFORT_ID     0x01
 315
 316 struct l2cap_disconn_req {
 317         __le16     dcid;
 318         __le16     scid;
 319 } __packed;
 320
 321 struct l2cap_disconn_rsp {
 322         __le16     dcid;
 323         __le16     scid;
 324 } __packed;
 325
 326 struct l2cap_info_req {
 327         __le16      type;
 328 } __packed;
 329
 330 struct l2cap_info_rsp {
 331         __le16      type;
 332         __le16      result;
 333         __u8        data[0];
 334 } __packed;
 335
 336 struct l2cap_create_chan_req {
 337         __le16      psm;
 338         __le16      scid;
 339         __u8        amp_id;
 340 } __packed;
 341
 342 struct l2cap_create_chan_rsp {
 343         __le16      dcid;
 344         __le16      scid;
 345         __le16      result;
 346         __le16      status;
 347 } __packed;
 348
 349 struct l2cap_move_chan_req {
 350         __le16      icid;
 351         __u8        dest_amp_id;
 352 } __packed;
 353
 354 struct l2cap_move_chan_rsp {
 355         __le16      icid;
 356         __le16      result;
 357 } __packed;
 358
 359 #define L2CAP_MR_SUCCESS        0x0000
 360 #define L2CAP_MR_PEND           0x0001
 361 #define L2CAP_MR_BAD_ID         0x0002
 362 #define L2CAP_MR_SAME_ID        0x0003
 363 #define L2CAP_MR_NOT_SUPP       0x0004
 364 #define L2CAP_MR_COLLISION      0x0005
 365 #define L2CAP_MR_NOT_ALLOWED    0x0006
 366
 367 struct l2cap_move_chan_cfm {
 368         __le16      icid;
 369         __le16      result;
 370 } __packed;
 371
 372 #define L2CAP_MC_CONFIRMED      0x0000
 373 #define L2CAP_MC_UNCONFIRMED    0x0001
 374
 375 struct l2cap_move_chan_cfm_rsp {
 376         __le16      icid;
 377 } __packed;
 378
 379 /* info type */
 380 #define L2CAP_IT_CL_MTU         0x0001
 381 #define L2CAP_IT_FEAT_MASK      0x0002
 382 #define L2CAP_IT_FIXED_CHAN     0x0003
 383
 384 /* info result */
 385 #define L2CAP_IR_SUCCESS        0x0000
 386 #define L2CAP_IR_NOTSUPP        0x0001
 387
 388 struct l2cap_conn_param_update_req {
 389         __le16      min;
 390         __le16      max;
 391         __le16      latency;
 392         __le16      to_multiplier;
 393 } __packed;
 394
 395 struct l2cap_conn_param_update_rsp {
 396         __le16      result;
 397 } __packed;
 398
 399 /* Connection Parameters result */
 400 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 401 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 402
 403 /* ----- L2CAP channels and connections ----- */
 404 struct srej_list {
 405         __u16   tx_seq;
 406         struct list_head list;
 407 };
 408
 409 struct l2cap_chan {
 410         struct sock *sk;
 411
 412         struct l2cap_conn       *conn;
 413
 414         __u8            state;
 415
 416         atomic_t        refcnt;
 417
 418         __le16          psm;
 419         __u16           dcid;
 420         __u16           scid;
 421
 422         __u16           imtu;
 423         __u16           omtu;
 424         __u16           flush_to;
 425         __u8            mode;
 426         __u8            chan_type;
 427         __u8            chan_policy;
 428
 429         __le16          sport;
 430
 431         __u8            sec_level;
 432
 433         __u8            ident;
 434
 435         __u8            conf_req[64];
 436         __u8            conf_len;
 437         __u8            num_conf_req;
 438         __u8            num_conf_rsp;
 439
 440         __u8            fcs;
 441
 442         __u16           tx_win;
 443         __u16           tx_win_max;
 444         __u8            max_tx;
 445         __u16           retrans_timeout;
 446         __u16           monitor_timeout;
 447         __u16           mps;
 448
 449         unsigned long   conf_state;
 450         unsigned long   conn_state;
 451         unsigned long   flags;
 452
 453         __u16           next_tx_seq;
 454         __u16           expected_ack_seq;
 455         __u16           expected_tx_seq;
 456         __u16           buffer_seq;
 457         __u16           buffer_seq_srej;
 458         __u16           srej_save_reqseq;
 459         __u16           frames_sent;
 460         __u16           unacked_frames;
 461         __u8            retry_count;
 462         __u8            num_acked;
 463         __u16           sdu_len;
 464         struct sk_buff  *sdu;
 465         struct sk_buff  *sdu_last_frag;
 466
 467         __u16           remote_tx_win;
 468         __u8            remote_max_tx;
 469         __u16           remote_mps;
 470
 471         __u8            local_id;
 472         __u8            local_stype;
 473         __u16           local_msdu;
 474         __u32           local_sdu_itime;
 475         __u32           local_acc_lat;
 476         __u32           local_flush_to;
 477
 478         __u8            remote_id;
 479         __u8            remote_stype;
 480         __u16           remote_msdu;
 481         __u32           remote_sdu_itime;
 482         __u32           remote_acc_lat;
 483         __u32           remote_flush_to;
 484
 485         struct delayed_work     chan_timer;
 486         struct delayed_work     retrans_timer;
 487         struct delayed_work     monitor_timer;
 488         struct delayed_work     ack_timer;
 489
 490         struct sk_buff          *tx_send_head;
 491         struct sk_buff_head     tx_q;
 492         struct sk_buff_head     srej_q;
 493         struct list_head        srej_l;
 494
 495         struct list_head        list;
 496         struct list_head        global_l;
 497
 498         void                    *data;
 499         struct l2cap_ops        *ops;
 500         struct mutex            lock;
 501 };
 502
 503 struct l2cap_ops {
 504         char                    *name;
 505
 506         struct l2cap_chan       *(*new_connection) (void *data);
 507         int                     (*recv) (void *data, struct sk_buff *skb);
 508         void                    (*close) (void *data);
 509         void                    (*state_change) (void *data, int state);
 510         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 511                                         unsigned long len, int nb, int *err);
 512
 513 };
 514
 515 struct l2cap_conn {
 516         struct hci_conn         *hcon;
 517         struct hci_chan         *hchan;
 518
 519         bdaddr_t                *dst;
 520         bdaddr_t                *src;
 521
 522         unsigned int            mtu;
 523
 524         __u32                   feat_mask;
 525         __u8                    fixed_chan_mask;
 526
 527         __u8                    info_state;
 528         __u8                    info_ident;
 529
 530         struct delayed_work     info_timer;
 531
 532         spinlock_t              lock;
 533
 534         struct sk_buff          *rx_skb;
 535         __u32                   rx_len;
 536         __u8                    tx_ident;
 537
 538         __u8                    disc_reason;
 539
 540         struct delayed_work     security_timer;
 541         struct smp_chan         *smp_chan;
 542
 543         struct list_head        chan_l;
 544         struct mutex            chan_lock;
 545 };
 546
 547 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 548 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 549 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 550
 551 #define L2CAP_CHAN_RAW                  1
 552 #define L2CAP_CHAN_CONN_LESS            2
 553 #define L2CAP_CHAN_CONN_ORIENTED        3
 554
 555 /* ----- L2CAP socket info ----- */
 556 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 557
 558 struct l2cap_pinfo {
 559         struct bt_sock          bt;
 560         struct l2cap_chan       *chan;
 561         struct sk_buff          *rx_busy_skb;
 562 };
 563
 564 enum {
 565         CONF_REQ_SENT,
 566         CONF_INPUT_DONE,
 567         CONF_OUTPUT_DONE,
 568         CONF_MTU_DONE,
 569         CONF_MODE_DONE,
 570         CONF_CONNECT_PEND,
 571         CONF_NO_FCS_RECV,
 572         CONF_STATE2_DEVICE,
 573         CONF_EWS_RECV,
 574         CONF_LOC_CONF_PEND,
 575         CONF_REM_CONF_PEND,
 576 };
 577
 578 #define L2CAP_CONF_MAX_CONF_REQ 2
 579 #define L2CAP_CONF_MAX_CONF_RSP 2
 580
 581 enum {
 582         CONN_SREJ_SENT,
 583         CONN_WAIT_F,
 584         CONN_SREJ_ACT,
 585         CONN_SEND_PBIT,
 586         CONN_REMOTE_BUSY,
 587         CONN_LOCAL_BUSY,
 588         CONN_REJ_ACT,
 589         CONN_SEND_FBIT,
 590         CONN_RNR_SENT,
 591 };
 592
 593 /* Definitions for flags in l2cap_chan */
 594 enum {
 595         FLAG_ROLE_SWITCH,
 596         FLAG_FORCE_ACTIVE,
 597         FLAG_FORCE_RELIABLE,
 598         FLAG_FLUSHABLE,
 599         FLAG_EXT_CTRL,
 600         FLAG_EFS_ENABLE,
 601 };
 602
 603 static inline void l2cap_chan_hold(struct l2cap_chan *c)
 604 {
 605         atomic_inc(&c->refcnt);
 606 }
 607
 608 static inline void l2cap_chan_put(struct l2cap_chan *c)
 609 {
 610         if (atomic_dec_and_test(&c->refcnt))
 611                 kfree(c);
 612 }
 613
 614 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 615 {
 616         mutex_lock(&chan->lock);
 617 }
 618
 619 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 620 {
 621         mutex_unlock(&chan->lock);
 622 }
 623
 624 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 625                                         struct delayed_work *work, long timeout)
 626 {
 627         BT_DBG("chan %p state %s timeout %ld", chan,
 628                                         state_to_string(chan->state), timeout);
 629
 630         if (!cancel_delayed_work(work))
 631                 l2cap_chan_hold(chan);
 632         schedule_delayed_work(work, timeout);
 633 }
 634
 635 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 636                                         struct delayed_work *work)
 637 {
 638         bool ret;
 639
 640         ret = cancel_delayed_work(work);
 641         if (ret)
 642                 l2cap_chan_put(chan);
 643
 644         return ret;
 645 }
 646
 647 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 648 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 649 #define __set_retrans_timer(c) l2cap_set_timer(c, &c->retrans_timer, \
 650                 msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
 651 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 652 #define __set_monitor_timer(c) l2cap_set_timer(c, &c->monitor_timer, \
 653                 msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
 654 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 655 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 656                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 657 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 658
 659 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 660 {
 661         int offset;
 662
 663         offset = (seq1 - seq2) % (chan->tx_win_max + 1);
 664         if (offset < 0)
 665                 offset += (chan->tx_win_max + 1);
 666
 667         return offset;
 668 }
 669
 670 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 671 {
 672         return (seq + 1) % (chan->tx_win_max + 1);
 673 }
 674
 675 static inline int l2cap_tx_window_full(struct l2cap_chan *ch)
 676 {
 677         int sub;
 678
 679         sub = (ch->next_tx_seq - ch->expected_ack_seq) % 64;
 680
 681         if (sub < 0)
 682                 sub += 64;
 683
 684         return sub == ch->remote_tx_win;
 685 }
 686
 687 static inline __u16 __get_reqseq(struct l2cap_chan *chan, __u32 ctrl)
 688 {
 689         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 690                 return (ctrl & L2CAP_EXT_CTRL_REQSEQ) >>
 691                                                 L2CAP_EXT_CTRL_REQSEQ_SHIFT;
 692         else
 693                 return (ctrl & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
 694 }
 695
 696 static inline __u32 __set_reqseq(struct l2cap_chan *chan, __u32 reqseq)
 697 {
 698         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 699                 return (reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT) &
 700                                                         L2CAP_EXT_CTRL_REQSEQ;
 701         else
 702                 return (reqseq << L2CAP_CTRL_REQSEQ_SHIFT) & L2CAP_CTRL_REQSEQ;
 703 }
 704
 705 static inline __u16 __get_txseq(struct l2cap_chan *chan, __u32 ctrl)
 706 {
 707         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 708                 return (ctrl & L2CAP_EXT_CTRL_TXSEQ) >>
 709                                                 L2CAP_EXT_CTRL_TXSEQ_SHIFT;
 710         else
 711                 return (ctrl & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
 712 }
 713
 714 static inline __u32 __set_txseq(struct l2cap_chan *chan, __u32 txseq)
 715 {
 716         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 717                 return (txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT) &
 718                                                         L2CAP_EXT_CTRL_TXSEQ;
 719         else
 720                 return (txseq << L2CAP_CTRL_TXSEQ_SHIFT) & L2CAP_CTRL_TXSEQ;
 721 }
 722
 723 static inline bool __is_sframe(struct l2cap_chan *chan, __u32 ctrl)
 724 {
 725         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 726                 return ctrl & L2CAP_EXT_CTRL_FRAME_TYPE;
 727         else
 728                 return ctrl & L2CAP_CTRL_FRAME_TYPE;
 729 }
 730
 731 static inline __u32 __set_sframe(struct l2cap_chan *chan)
 732 {
 733         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 734                 return L2CAP_EXT_CTRL_FRAME_TYPE;
 735         else
 736                 return L2CAP_CTRL_FRAME_TYPE;
 737 }
 738
 739 static inline __u8 __get_ctrl_sar(struct l2cap_chan *chan, __u32 ctrl)
 740 {
 741         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 742                 return (ctrl & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
 743         else
 744                 return (ctrl & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
 745 }
 746
 747 static inline __u32 __set_ctrl_sar(struct l2cap_chan *chan, __u32 sar)
 748 {
 749         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 750                 return (sar << L2CAP_EXT_CTRL_SAR_SHIFT) & L2CAP_EXT_CTRL_SAR;
 751         else
 752                 return (sar << L2CAP_CTRL_SAR_SHIFT) & L2CAP_CTRL_SAR;
 753 }
 754
 755 static inline bool __is_sar_start(struct l2cap_chan *chan, __u32 ctrl)
 756 {
 757         return __get_ctrl_sar(chan, ctrl) == L2CAP_SAR_START;
 758 }
 759
 760 static inline __u32 __get_sar_mask(struct l2cap_chan *chan)
 761 {
 762         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 763                 return L2CAP_EXT_CTRL_SAR;
 764         else
 765                 return L2CAP_CTRL_SAR;
 766 }
 767
 768 static inline __u8 __get_ctrl_super(struct l2cap_chan *chan, __u32 ctrl)
 769 {
 770         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 771                 return (ctrl & L2CAP_EXT_CTRL_SUPERVISE) >>
 772                                                 L2CAP_EXT_CTRL_SUPER_SHIFT;
 773         else
 774                 return (ctrl & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
 775 }
 776
 777 static inline __u32 __set_ctrl_super(struct l2cap_chan *chan, __u32 super)
 778 {
 779         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 780                 return (super << L2CAP_EXT_CTRL_SUPER_SHIFT) &
 781                                                 L2CAP_EXT_CTRL_SUPERVISE;
 782         else
 783                 return (super << L2CAP_CTRL_SUPER_SHIFT) &
 784                                                         L2CAP_CTRL_SUPERVISE;
 785 }
 786
 787 static inline __u32 __set_ctrl_final(struct l2cap_chan *chan)
 788 {
 789         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 790                 return L2CAP_EXT_CTRL_FINAL;
 791         else
 792                 return L2CAP_CTRL_FINAL;
 793 }
 794
 795 static inline bool __is_ctrl_final(struct l2cap_chan *chan, __u32 ctrl)
 796 {
 797         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 798                 return ctrl & L2CAP_EXT_CTRL_FINAL;
 799         else
 800                 return ctrl & L2CAP_CTRL_FINAL;
 801 }
 802
 803 static inline __u32 __set_ctrl_poll(struct l2cap_chan *chan)
 804 {
 805         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 806                 return L2CAP_EXT_CTRL_POLL;
 807         else
 808                 return L2CAP_CTRL_POLL;
 809 }
 810
 811 static inline bool __is_ctrl_poll(struct l2cap_chan *chan, __u32 ctrl)
 812 {
 813         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 814                 return ctrl & L2CAP_EXT_CTRL_POLL;
 815         else
 816                 return ctrl & L2CAP_CTRL_POLL;
 817 }
 818
 819 static inline __u32 __get_control(struct l2cap_chan *chan, void *p)
 820 {
 821         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 822                 return get_unaligned_le32(p);
 823         else
 824                 return get_unaligned_le16(p);
 825 }
 826
 827 static inline void __put_control(struct l2cap_chan *chan, __u32 control,
 828                                                                 void *p)
 829 {
 830         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 831                 return put_unaligned_le32(control, p);
 832         else
 833                 return put_unaligned_le16(control, p);
 834 }
 835
 836 static inline __u8 __ctrl_size(struct l2cap_chan *chan)
 837 {
 838         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 839                 return L2CAP_EXT_HDR_SIZE - L2CAP_HDR_SIZE;
 840         else
 841                 return L2CAP_ENH_HDR_SIZE - L2CAP_HDR_SIZE;
 842 }
 843
 844 extern bool disable_ertm;
 845
 846 int l2cap_init_sockets(void);
 847 void l2cap_cleanup_sockets(void);
 848
 849 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 850 int __l2cap_wait_ack(struct sock *sk);
 851
 852 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 853 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 854
 855 struct l2cap_chan *l2cap_chan_create(struct sock *sk);
 856 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 857 void l2cap_chan_destroy(struct l2cap_chan *chan);
 858 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 859                                                                 bdaddr_t *dst);
 860 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
 861                                                                 u32 priority);
 862 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 863 int l2cap_chan_check_security(struct l2cap_chan *chan);
 864
 865 #endif /* __L2CAP_H */