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_DEFAULT_MAX_SDU_SIZE      0xFFFF
  44 #define L2CAP_DEFAULT_SDU_ITIME         0xFFFFFFFF
  45 #define L2CAP_DEFAULT_ACC_LAT           0xFFFFFFFF
  46 #define L2CAP_BREDR_MAX_PAYLOAD         1019    /* 3-DH5 packet */
  47 #define L2CAP_LE_MIN_MTU                23
  48
  49 #define L2CAP_DISC_TIMEOUT              msecs_to_jiffies(100)
  50 #define L2CAP_DISC_REJ_TIMEOUT          msecs_to_jiffies(5000)
  51 #define L2CAP_ENC_TIMEOUT               msecs_to_jiffies(5000)
  52 #define L2CAP_CONN_TIMEOUT              msecs_to_jiffies(40000)
  53 #define L2CAP_INFO_TIMEOUT              msecs_to_jiffies(4000)
  54
  55 #define L2CAP_A2MP_DEFAULT_MTU          670
  56
  57 /* L2CAP socket address */
  58 struct sockaddr_l2 {
  59         sa_family_t     l2_family;
  60         __le16          l2_psm;
  61         bdaddr_t        l2_bdaddr;
  62         __le16          l2_cid;
  63         __u8            l2_bdaddr_type;
  64 };
  65
  66 /* L2CAP socket options */
  67 #define L2CAP_OPTIONS   0x01
  68 struct l2cap_options {
  69         __u16 omtu;
  70         __u16 imtu;
  71         __u16 flush_to;
  72         __u8  mode;
  73         __u8  fcs;
  74         __u8  max_tx;
  75         __u16 txwin_size;
  76 };
  77
  78 #define L2CAP_CONNINFO  0x02
  79 struct l2cap_conninfo {
  80         __u16 hci_handle;
  81         __u8  dev_class[3];
  82 };
  83
  84 #define L2CAP_LM        0x03
  85 #define L2CAP_LM_MASTER         0x0001
  86 #define L2CAP_LM_AUTH           0x0002
  87 #define L2CAP_LM_ENCRYPT        0x0004
  88 #define L2CAP_LM_TRUSTED        0x0008
  89 #define L2CAP_LM_RELIABLE       0x0010
  90 #define L2CAP_LM_SECURE         0x0020
  91
  92 /* L2CAP command codes */
  93 #define L2CAP_COMMAND_REJ       0x01
  94 #define L2CAP_CONN_REQ          0x02
  95 #define L2CAP_CONN_RSP          0x03
  96 #define L2CAP_CONF_REQ          0x04
  97 #define L2CAP_CONF_RSP          0x05
  98 #define L2CAP_DISCONN_REQ       0x06
  99 #define L2CAP_DISCONN_RSP       0x07
 100 #define L2CAP_ECHO_REQ          0x08
 101 #define L2CAP_ECHO_RSP          0x09
 102 #define L2CAP_INFO_REQ          0x0a
 103 #define L2CAP_INFO_RSP          0x0b
 104 #define L2CAP_CREATE_CHAN_REQ   0x0c
 105 #define L2CAP_CREATE_CHAN_RSP   0x0d
 106 #define L2CAP_MOVE_CHAN_REQ     0x0e
 107 #define L2CAP_MOVE_CHAN_RSP     0x0f
 108 #define L2CAP_MOVE_CHAN_CFM     0x10
 109 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
 110 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
 111 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
 112
 113 /* L2CAP extended feature mask */
 114 #define L2CAP_FEAT_FLOWCTL      0x00000001
 115 #define L2CAP_FEAT_RETRANS      0x00000002
 116 #define L2CAP_FEAT_BIDIR_QOS    0x00000004
 117 #define L2CAP_FEAT_ERTM         0x00000008
 118 #define L2CAP_FEAT_STREAMING    0x00000010
 119 #define L2CAP_FEAT_FCS          0x00000020
 120 #define L2CAP_FEAT_EXT_FLOW     0x00000040
 121 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 122 #define L2CAP_FEAT_EXT_WINDOW   0x00000100
 123 #define L2CAP_FEAT_UCD          0x00000200
 124
 125 /* L2CAP checksum option */
 126 #define L2CAP_FCS_NONE          0x00
 127 #define L2CAP_FCS_CRC16         0x01
 128
 129 /* L2CAP fixed channels */
 130 #define L2CAP_FC_L2CAP          0x02
 131 #define L2CAP_FC_A2MP           0x08
 132
 133 /* L2CAP Control Field bit masks */
 134 #define L2CAP_CTRL_SAR                  0xC000
 135 #define L2CAP_CTRL_REQSEQ               0x3F00
 136 #define L2CAP_CTRL_TXSEQ                0x007E
 137 #define L2CAP_CTRL_SUPERVISE            0x000C
 138
 139 #define L2CAP_CTRL_RETRANS              0x0080
 140 #define L2CAP_CTRL_FINAL                0x0080
 141 #define L2CAP_CTRL_POLL                 0x0010
 142 #define L2CAP_CTRL_FRAME_TYPE           0x0001 /* I- or S-Frame */
 143
 144 #define L2CAP_CTRL_TXSEQ_SHIFT          1
 145 #define L2CAP_CTRL_SUPER_SHIFT          2
 146 #define L2CAP_CTRL_POLL_SHIFT           4
 147 #define L2CAP_CTRL_FINAL_SHIFT          7
 148 #define L2CAP_CTRL_REQSEQ_SHIFT         8
 149 #define L2CAP_CTRL_SAR_SHIFT            14
 150
 151 /* L2CAP Extended Control Field bit mask */
 152 #define L2CAP_EXT_CTRL_TXSEQ            0xFFFC0000
 153 #define L2CAP_EXT_CTRL_SAR              0x00030000
 154 #define L2CAP_EXT_CTRL_SUPERVISE        0x00030000
 155 #define L2CAP_EXT_CTRL_REQSEQ           0x0000FFFC
 156
 157 #define L2CAP_EXT_CTRL_POLL             0x00040000
 158 #define L2CAP_EXT_CTRL_FINAL            0x00000002
 159 #define L2CAP_EXT_CTRL_FRAME_TYPE       0x00000001 /* I- or S-Frame */
 160
 161 #define L2CAP_EXT_CTRL_FINAL_SHIFT      1
 162 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT     2
 163 #define L2CAP_EXT_CTRL_SAR_SHIFT        16
 164 #define L2CAP_EXT_CTRL_SUPER_SHIFT      16
 165 #define L2CAP_EXT_CTRL_POLL_SHIFT       18
 166 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT      18
 167
 168 /* L2CAP Supervisory Function */
 169 #define L2CAP_SUPER_RR          0x00
 170 #define L2CAP_SUPER_REJ         0x01
 171 #define L2CAP_SUPER_RNR         0x02
 172 #define L2CAP_SUPER_SREJ        0x03
 173
 174 /* L2CAP Segmentation and Reassembly */
 175 #define L2CAP_SAR_UNSEGMENTED   0x00
 176 #define L2CAP_SAR_START         0x01
 177 #define L2CAP_SAR_END           0x02
 178 #define L2CAP_SAR_CONTINUE      0x03
 179
 180 /* L2CAP Command rej. reasons */
 181 #define L2CAP_REJ_NOT_UNDERSTOOD        0x0000
 182 #define L2CAP_REJ_MTU_EXCEEDED          0x0001
 183 #define L2CAP_REJ_INVALID_CID           0x0002
 184
 185 /* L2CAP structures */
 186 struct l2cap_hdr {
 187         __le16     len;
 188         __le16     cid;
 189 } __packed;
 190 #define L2CAP_HDR_SIZE          4
 191 #define L2CAP_ENH_HDR_SIZE      6
 192 #define L2CAP_EXT_HDR_SIZE      8
 193
 194 #define L2CAP_FCS_SIZE          2
 195 #define L2CAP_SDULEN_SIZE       2
 196 #define L2CAP_PSMLEN_SIZE       2
 197 #define L2CAP_ENH_CTRL_SIZE     2
 198 #define L2CAP_EXT_CTRL_SIZE     4
 199
 200 struct l2cap_cmd_hdr {
 201         __u8       code;
 202         __u8       ident;
 203         __le16     len;
 204 } __packed;
 205 #define L2CAP_CMD_HDR_SIZE      4
 206
 207 struct l2cap_cmd_rej_unk {
 208         __le16     reason;
 209 } __packed;
 210
 211 struct l2cap_cmd_rej_mtu {
 212         __le16     reason;
 213         __le16     max_mtu;
 214 } __packed;
 215
 216 struct l2cap_cmd_rej_cid {
 217         __le16     reason;
 218         __le16     scid;
 219         __le16     dcid;
 220 } __packed;
 221
 222 struct l2cap_conn_req {
 223         __le16     psm;
 224         __le16     scid;
 225 } __packed;
 226
 227 struct l2cap_conn_rsp {
 228         __le16     dcid;
 229         __le16     scid;
 230         __le16     result;
 231         __le16     status;
 232 } __packed;
 233
 234 /* protocol/service multiplexer (PSM) */
 235 #define L2CAP_PSM_SDP           0x0001
 236 #define L2CAP_PSM_RFCOMM        0x0003
 237
 238 /* channel indentifier */
 239 #define L2CAP_CID_SIGNALING     0x0001
 240 #define L2CAP_CID_CONN_LESS     0x0002
 241 #define L2CAP_CID_A2MP          0x0003
 242 #define L2CAP_CID_LE_DATA       0x0004
 243 #define L2CAP_CID_LE_SIGNALING  0x0005
 244 #define L2CAP_CID_SMP           0x0006
 245 #define L2CAP_CID_DYN_START     0x0040
 246 #define L2CAP_CID_DYN_END       0xffff
 247
 248 /* connect/create channel results */
 249 #define L2CAP_CR_SUCCESS        0x0000
 250 #define L2CAP_CR_PEND           0x0001
 251 #define L2CAP_CR_BAD_PSM        0x0002
 252 #define L2CAP_CR_SEC_BLOCK      0x0003
 253 #define L2CAP_CR_NO_MEM         0x0004
 254 #define L2CAP_CR_BAD_AMP        0x0005
 255
 256 /* connect/create channel status */
 257 #define L2CAP_CS_NO_INFO        0x0000
 258 #define L2CAP_CS_AUTHEN_PEND    0x0001
 259 #define L2CAP_CS_AUTHOR_PEND    0x0002
 260
 261 struct l2cap_conf_req {
 262         __le16     dcid;
 263         __le16     flags;
 264         __u8       data[0];
 265 } __packed;
 266
 267 struct l2cap_conf_rsp {
 268         __le16     scid;
 269         __le16     flags;
 270         __le16     result;
 271         __u8       data[0];
 272 } __packed;
 273
 274 #define L2CAP_CONF_SUCCESS      0x0000
 275 #define L2CAP_CONF_UNACCEPT     0x0001
 276 #define L2CAP_CONF_REJECT       0x0002
 277 #define L2CAP_CONF_UNKNOWN      0x0003
 278 #define L2CAP_CONF_PENDING      0x0004
 279 #define L2CAP_CONF_EFS_REJECT   0x0005
 280
 281 /* configuration req/rsp continuation flag */
 282 #define L2CAP_CONF_FLAG_CONTINUATION    0x0001
 283
 284 struct l2cap_conf_opt {
 285         __u8       type;
 286         __u8       len;
 287         __u8       val[0];
 288 } __packed;
 289 #define L2CAP_CONF_OPT_SIZE     2
 290
 291 #define L2CAP_CONF_HINT         0x80
 292 #define L2CAP_CONF_MASK         0x7f
 293
 294 #define L2CAP_CONF_MTU          0x01
 295 #define L2CAP_CONF_FLUSH_TO     0x02
 296 #define L2CAP_CONF_QOS          0x03
 297 #define L2CAP_CONF_RFC          0x04
 298 #define L2CAP_CONF_FCS          0x05
 299 #define L2CAP_CONF_EFS          0x06
 300 #define L2CAP_CONF_EWS          0x07
 301
 302 #define L2CAP_CONF_MAX_SIZE     22
 303
 304 struct l2cap_conf_rfc {
 305         __u8       mode;
 306         __u8       txwin_size;
 307         __u8       max_transmit;
 308         __le16     retrans_timeout;
 309         __le16     monitor_timeout;
 310         __le16     max_pdu_size;
 311 } __packed;
 312
 313 #define L2CAP_MODE_BASIC        0x00
 314 #define L2CAP_MODE_RETRANS      0x01
 315 #define L2CAP_MODE_FLOWCTL      0x02
 316 #define L2CAP_MODE_ERTM         0x03
 317 #define L2CAP_MODE_STREAMING    0x04
 318
 319 struct l2cap_conf_efs {
 320         __u8    id;
 321         __u8    stype;
 322         __le16  msdu;
 323         __le32  sdu_itime;
 324         __le32  acc_lat;
 325         __le32  flush_to;
 326 } __packed;
 327
 328 #define L2CAP_SERV_NOTRAFIC     0x00
 329 #define L2CAP_SERV_BESTEFFORT   0x01
 330 #define L2CAP_SERV_GUARANTEED   0x02
 331
 332 #define L2CAP_BESTEFFORT_ID     0x01
 333
 334 struct l2cap_disconn_req {
 335         __le16     dcid;
 336         __le16     scid;
 337 } __packed;
 338
 339 struct l2cap_disconn_rsp {
 340         __le16     dcid;
 341         __le16     scid;
 342 } __packed;
 343
 344 struct l2cap_info_req {
 345         __le16      type;
 346 } __packed;
 347
 348 struct l2cap_info_rsp {
 349         __le16      type;
 350         __le16      result;
 351         __u8        data[0];
 352 } __packed;
 353
 354 struct l2cap_create_chan_req {
 355         __le16      psm;
 356         __le16      scid;
 357         __u8        amp_id;
 358 } __packed;
 359
 360 struct l2cap_create_chan_rsp {
 361         __le16      dcid;
 362         __le16      scid;
 363         __le16      result;
 364         __le16      status;
 365 } __packed;
 366
 367 struct l2cap_move_chan_req {
 368         __le16      icid;
 369         __u8        dest_amp_id;
 370 } __packed;
 371
 372 struct l2cap_move_chan_rsp {
 373         __le16      icid;
 374         __le16      result;
 375 } __packed;
 376
 377 #define L2CAP_MR_SUCCESS        0x0000
 378 #define L2CAP_MR_PEND           0x0001
 379 #define L2CAP_MR_BAD_ID         0x0002
 380 #define L2CAP_MR_SAME_ID        0x0003
 381 #define L2CAP_MR_NOT_SUPP       0x0004
 382 #define L2CAP_MR_COLLISION      0x0005
 383 #define L2CAP_MR_NOT_ALLOWED    0x0006
 384
 385 struct l2cap_move_chan_cfm {
 386         __le16      icid;
 387         __le16      result;
 388 } __packed;
 389
 390 #define L2CAP_MC_CONFIRMED      0x0000
 391 #define L2CAP_MC_UNCONFIRMED    0x0001
 392
 393 struct l2cap_move_chan_cfm_rsp {
 394         __le16      icid;
 395 } __packed;
 396
 397 /* info type */
 398 #define L2CAP_IT_CL_MTU         0x0001
 399 #define L2CAP_IT_FEAT_MASK      0x0002
 400 #define L2CAP_IT_FIXED_CHAN     0x0003
 401
 402 /* info result */
 403 #define L2CAP_IR_SUCCESS        0x0000
 404 #define L2CAP_IR_NOTSUPP        0x0001
 405
 406 struct l2cap_conn_param_update_req {
 407         __le16      min;
 408         __le16      max;
 409         __le16      latency;
 410         __le16      to_multiplier;
 411 } __packed;
 412
 413 struct l2cap_conn_param_update_rsp {
 414         __le16      result;
 415 } __packed;
 416
 417 /* Connection Parameters result */
 418 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 419 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 420
 421 /* ----- L2CAP channels and connections ----- */
 422 struct l2cap_seq_list {
 423         __u16   head;
 424         __u16   tail;
 425         __u16   mask;
 426         __u16   *list;
 427 };
 428
 429 #define L2CAP_SEQ_LIST_CLEAR    0xFFFF
 430 #define L2CAP_SEQ_LIST_TAIL     0x8000
 431
 432 struct l2cap_chan {
 433         struct sock *sk;
 434
 435         struct l2cap_conn       *conn;
 436
 437         __u8            state;
 438
 439         atomic_t        refcnt;
 440
 441         __le16          psm;
 442         __u16           dcid;
 443         __u16           scid;
 444
 445         __u16           imtu;
 446         __u16           omtu;
 447         __u16           flush_to;
 448         __u8            mode;
 449         __u8            chan_type;
 450         __u8            chan_policy;
 451
 452         __le16          sport;
 453
 454         __u8            sec_level;
 455
 456         __u8            ident;
 457
 458         __u8            conf_req[64];
 459         __u8            conf_len;
 460         __u8            num_conf_req;
 461         __u8            num_conf_rsp;
 462
 463         __u8            fcs;
 464
 465         __u16           tx_win;
 466         __u16           tx_win_max;
 467         __u8            max_tx;
 468         __u16           retrans_timeout;
 469         __u16           monitor_timeout;
 470         __u16           mps;
 471
 472         __u8            tx_state;
 473         __u8            rx_state;
 474
 475         unsigned long   conf_state;
 476         unsigned long   conn_state;
 477         unsigned long   flags;
 478
 479         __u16           next_tx_seq;
 480         __u16           expected_ack_seq;
 481         __u16           expected_tx_seq;
 482         __u16           buffer_seq;
 483         __u16           srej_save_reqseq;
 484         __u16           last_acked_seq;
 485         __u16           frames_sent;
 486         __u16           unacked_frames;
 487         __u8            retry_count;
 488         __u16           srej_queue_next;
 489         __u16           sdu_len;
 490         struct sk_buff  *sdu;
 491         struct sk_buff  *sdu_last_frag;
 492
 493         __u16           remote_tx_win;
 494         __u8            remote_max_tx;
 495         __u16           remote_mps;
 496
 497         __u8            local_id;
 498         __u8            local_stype;
 499         __u16           local_msdu;
 500         __u32           local_sdu_itime;
 501         __u32           local_acc_lat;
 502         __u32           local_flush_to;
 503
 504         __u8            remote_id;
 505         __u8            remote_stype;
 506         __u16           remote_msdu;
 507         __u32           remote_sdu_itime;
 508         __u32           remote_acc_lat;
 509         __u32           remote_flush_to;
 510
 511         struct delayed_work     chan_timer;
 512         struct delayed_work     retrans_timer;
 513         struct delayed_work     monitor_timer;
 514         struct delayed_work     ack_timer;
 515
 516         struct sk_buff          *tx_send_head;
 517         struct sk_buff_head     tx_q;
 518         struct sk_buff_head     srej_q;
 519         struct l2cap_seq_list   srej_list;
 520         struct l2cap_seq_list   retrans_list;
 521
 522         struct list_head        list;
 523         struct list_head        global_l;
 524
 525         void                    *data;
 526         struct l2cap_ops        *ops;
 527         struct mutex            lock;
 528 };
 529
 530 struct l2cap_ops {
 531         char                    *name;
 532
 533         struct l2cap_chan       *(*new_connection) (struct l2cap_chan *chan);
 534         int                     (*recv) (struct l2cap_chan * chan,
 535                                          struct sk_buff *skb);
 536         void                    (*teardown) (struct l2cap_chan *chan, int err);
 537         void                    (*close) (struct l2cap_chan *chan);
 538         void                    (*state_change) (struct l2cap_chan *chan,
 539                                                  int state);
 540         void                    (*ready) (struct l2cap_chan *chan);
 541         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 542                                                unsigned long len, int nb);
 543 };
 544
 545 struct l2cap_conn {
 546         struct hci_conn         *hcon;
 547         struct hci_chan         *hchan;
 548
 549         bdaddr_t                *dst;
 550         bdaddr_t                *src;
 551
 552         unsigned int            mtu;
 553
 554         __u32                   feat_mask;
 555         __u8                    fixed_chan_mask;
 556
 557         __u8                    info_state;
 558         __u8                    info_ident;
 559
 560         struct delayed_work     info_timer;
 561
 562         spinlock_t              lock;
 563
 564         struct sk_buff          *rx_skb;
 565         __u32                   rx_len;
 566         __u8                    tx_ident;
 567
 568         __u8                    disc_reason;
 569
 570         struct delayed_work     security_timer;
 571         struct smp_chan         *smp_chan;
 572
 573         struct list_head        chan_l;
 574         struct mutex            chan_lock;
 575 };
 576
 577 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 578 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 579 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 580
 581 #define L2CAP_CHAN_RAW                  1
 582 #define L2CAP_CHAN_CONN_LESS            2
 583 #define L2CAP_CHAN_CONN_ORIENTED        3
 584 #define L2CAP_CHAN_CONN_FIX_A2MP        4
 585
 586 /* ----- L2CAP socket info ----- */
 587 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 588
 589 struct l2cap_pinfo {
 590         struct bt_sock          bt;
 591         struct l2cap_chan       *chan;
 592         struct sk_buff          *rx_busy_skb;
 593 };
 594
 595 enum {
 596         CONF_REQ_SENT,
 597         CONF_INPUT_DONE,
 598         CONF_OUTPUT_DONE,
 599         CONF_MTU_DONE,
 600         CONF_MODE_DONE,
 601         CONF_CONNECT_PEND,
 602         CONF_NO_FCS_RECV,
 603         CONF_STATE2_DEVICE,
 604         CONF_EWS_RECV,
 605         CONF_LOC_CONF_PEND,
 606         CONF_REM_CONF_PEND,
 607         CONF_NOT_COMPLETE,
 608 };
 609
 610 #define L2CAP_CONF_MAX_CONF_REQ 2
 611 #define L2CAP_CONF_MAX_CONF_RSP 2
 612
 613 enum {
 614         CONN_SREJ_SENT,
 615         CONN_WAIT_F,
 616         CONN_SREJ_ACT,
 617         CONN_SEND_PBIT,
 618         CONN_REMOTE_BUSY,
 619         CONN_LOCAL_BUSY,
 620         CONN_REJ_ACT,
 621         CONN_SEND_FBIT,
 622         CONN_RNR_SENT,
 623 };
 624
 625 /* Definitions for flags in l2cap_chan */
 626 enum {
 627         FLAG_ROLE_SWITCH,
 628         FLAG_FORCE_ACTIVE,
 629         FLAG_FORCE_RELIABLE,
 630         FLAG_FLUSHABLE,
 631         FLAG_EXT_CTRL,
 632         FLAG_EFS_ENABLE,
 633 };
 634
 635 enum {
 636         L2CAP_TX_STATE_XMIT,
 637         L2CAP_TX_STATE_WAIT_F,
 638 };
 639
 640 enum {
 641         L2CAP_RX_STATE_RECV,
 642         L2CAP_RX_STATE_SREJ_SENT,
 643 };
 644
 645 enum {
 646         L2CAP_TXSEQ_EXPECTED,
 647         L2CAP_TXSEQ_EXPECTED_SREJ,
 648         L2CAP_TXSEQ_UNEXPECTED,
 649         L2CAP_TXSEQ_UNEXPECTED_SREJ,
 650         L2CAP_TXSEQ_DUPLICATE,
 651         L2CAP_TXSEQ_DUPLICATE_SREJ,
 652         L2CAP_TXSEQ_INVALID,
 653         L2CAP_TXSEQ_INVALID_IGNORE,
 654 };
 655
 656 enum {
 657         L2CAP_EV_DATA_REQUEST,
 658         L2CAP_EV_LOCAL_BUSY_DETECTED,
 659         L2CAP_EV_LOCAL_BUSY_CLEAR,
 660         L2CAP_EV_RECV_REQSEQ_AND_FBIT,
 661         L2CAP_EV_RECV_FBIT,
 662         L2CAP_EV_RETRANS_TO,
 663         L2CAP_EV_MONITOR_TO,
 664         L2CAP_EV_EXPLICIT_POLL,
 665         L2CAP_EV_RECV_IFRAME,
 666         L2CAP_EV_RECV_RR,
 667         L2CAP_EV_RECV_REJ,
 668         L2CAP_EV_RECV_RNR,
 669         L2CAP_EV_RECV_SREJ,
 670         L2CAP_EV_RECV_FRAME,
 671 };
 672
 673 static inline void l2cap_chan_hold(struct l2cap_chan *c)
 674 {
 675         atomic_inc(&c->refcnt);
 676 }
 677
 678 static inline void l2cap_chan_put(struct l2cap_chan *c)
 679 {
 680         if (atomic_dec_and_test(&c->refcnt))
 681                 kfree(c);
 682 }
 683
 684 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 685 {
 686         mutex_lock(&chan->lock);
 687 }
 688
 689 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 690 {
 691         mutex_unlock(&chan->lock);
 692 }
 693
 694 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 695                                    struct delayed_work *work, long timeout)
 696 {
 697         BT_DBG("chan %p state %s timeout %ld", chan,
 698                state_to_string(chan->state), timeout);
 699
 700         /* If delayed work cancelled do not hold(chan)
 701            since it is already done with previous set_timer */
 702         if (!cancel_delayed_work(work))
 703                 l2cap_chan_hold(chan);
 704
 705         schedule_delayed_work(work, timeout);
 706 }
 707
 708 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 709                                      struct delayed_work *work)
 710 {
 711         bool ret;
 712
 713         /* put(chan) if delayed work cancelled otherwise it
 714            is done in delayed work function */
 715         ret = cancel_delayed_work(work);
 716         if (ret)
 717                 l2cap_chan_put(chan);
 718
 719         return ret;
 720 }
 721
 722 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 723 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 724 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 725 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 726 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 727                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 728 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 729
 730 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 731 {
 732         if (seq1 >= seq2)
 733                 return seq1 - seq2;
 734         else
 735                 return chan->tx_win_max + 1 - seq2 + seq1;
 736 }
 737
 738 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 739 {
 740         return (seq + 1) % (chan->tx_win_max + 1);
 741 }
 742
 743 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
 744 {
 745         return NULL;
 746 }
 747
 748 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
 749 {
 750 }
 751
 752 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
 753 {
 754 }
 755
 756 extern bool disable_ertm;
 757
 758 int l2cap_init_sockets(void);
 759 void l2cap_cleanup_sockets(void);
 760
 761 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 762 int __l2cap_wait_ack(struct sock *sk);
 763
 764 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 765 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 766
 767 struct l2cap_chan *l2cap_chan_create(void);
 768 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 769 void l2cap_chan_destroy(struct l2cap_chan *chan);
 770 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 771                        bdaddr_t *dst, u8 dst_type);
 772 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
 773                                                                 u32 priority);
 774 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 775 int l2cap_chan_check_security(struct l2cap_chan *chan);
 776 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
 777 int l2cap_ertm_init(struct l2cap_chan *chan);
 778 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 779 void l2cap_chan_del(struct l2cap_chan *chan, int err);
 780
 781 #endif /* __L2CAP_H */