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 #include <linux/atomic.h>
  32
  33 /* L2CAP defaults */
  34 #define L2CAP_DEFAULT_MTU               672
  35 #define L2CAP_DEFAULT_MIN_MTU           48
  36 #define L2CAP_DEFAULT_FLUSH_TO          0xFFFF
  37 #define L2CAP_EFS_DEFAULT_FLUSH_TO      0xFFFFFFFF
  38 #define L2CAP_DEFAULT_TX_WINDOW         63
  39 #define L2CAP_DEFAULT_EXT_WINDOW        0x3FFF
  40 #define L2CAP_DEFAULT_MAX_TX            3
  41 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  42 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  43 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1492    /* Sized for AMP packet */
  44 #define L2CAP_DEFAULT_ACK_TO            200
  45 #define L2CAP_DEFAULT_MAX_SDU_SIZE      0xFFFF
  46 #define L2CAP_DEFAULT_SDU_ITIME         0xFFFFFFFF
  47 #define L2CAP_DEFAULT_ACC_LAT           0xFFFFFFFF
  48 #define L2CAP_BREDR_MAX_PAYLOAD         1019    /* 3-DH5 packet */
  49 #define L2CAP_LE_MIN_MTU                23
  50
  51 #define L2CAP_DISC_TIMEOUT              msecs_to_jiffies(100)
  52 #define L2CAP_DISC_REJ_TIMEOUT          msecs_to_jiffies(5000)
  53 #define L2CAP_ENC_TIMEOUT               msecs_to_jiffies(5000)
  54 #define L2CAP_CONN_TIMEOUT              msecs_to_jiffies(40000)
  55 #define L2CAP_INFO_TIMEOUT              msecs_to_jiffies(4000)
  56 #define L2CAP_MOVE_TIMEOUT              msecs_to_jiffies(4000)
  57 #define L2CAP_MOVE_ERTX_TIMEOUT         msecs_to_jiffies(60000)
  58 #define L2CAP_WAIT_ACK_POLL_PERIOD      msecs_to_jiffies(200)
  59 #define L2CAP_WAIT_ACK_TIMEOUT          msecs_to_jiffies(10000)
  60
  61 #define L2CAP_A2MP_DEFAULT_MTU          670
  62
  63 /* L2CAP socket address */
  64 struct sockaddr_l2 {
  65         sa_family_t     l2_family;
  66         __le16          l2_psm;
  67         bdaddr_t        l2_bdaddr;
  68         __le16          l2_cid;
  69         __u8            l2_bdaddr_type;
  70 };
  71
  72 /* L2CAP socket options */
  73 #define L2CAP_OPTIONS   0x01
  74 struct l2cap_options {
  75         __u16 omtu;
  76         __u16 imtu;
  77         __u16 flush_to;
  78         __u8  mode;
  79         __u8  fcs;
  80         __u8  max_tx;
  81         __u16 txwin_size;
  82 };
  83
  84 #define L2CAP_CONNINFO  0x02
  85 struct l2cap_conninfo {
  86         __u16 hci_handle;
  87         __u8  dev_class[3];
  88 };
  89
  90 #define L2CAP_LM        0x03
  91 #define L2CAP_LM_MASTER         0x0001
  92 #define L2CAP_LM_AUTH           0x0002
  93 #define L2CAP_LM_ENCRYPT        0x0004
  94 #define L2CAP_LM_TRUSTED        0x0008
  95 #define L2CAP_LM_RELIABLE       0x0010
  96 #define L2CAP_LM_SECURE         0x0020
  97 #define L2CAP_LM_FIPS           0x0040
  98
  99 /* L2CAP command codes */
 100 #define L2CAP_COMMAND_REJ       0x01
 101 #define L2CAP_CONN_REQ          0x02
 102 #define L2CAP_CONN_RSP          0x03
 103 #define L2CAP_CONF_REQ          0x04
 104 #define L2CAP_CONF_RSP          0x05
 105 #define L2CAP_DISCONN_REQ       0x06
 106 #define L2CAP_DISCONN_RSP       0x07
 107 #define L2CAP_ECHO_REQ          0x08
 108 #define L2CAP_ECHO_RSP          0x09
 109 #define L2CAP_INFO_REQ          0x0a
 110 #define L2CAP_INFO_RSP          0x0b
 111 #define L2CAP_CREATE_CHAN_REQ   0x0c
 112 #define L2CAP_CREATE_CHAN_RSP   0x0d
 113 #define L2CAP_MOVE_CHAN_REQ     0x0e
 114 #define L2CAP_MOVE_CHAN_RSP     0x0f
 115 #define L2CAP_MOVE_CHAN_CFM     0x10
 116 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
 117 #define L2CAP_CONN_PARAM_UPDATE_REQ     0x12
 118 #define L2CAP_CONN_PARAM_UPDATE_RSP     0x13
 119 #define L2CAP_LE_CONN_REQ       0x14
 120 #define L2CAP_LE_CONN_RSP       0x15
 121 #define L2CAP_LE_CREDITS        0x16
 122
 123 /* L2CAP extended feature mask */
 124 #define L2CAP_FEAT_FLOWCTL      0x00000001
 125 #define L2CAP_FEAT_RETRANS      0x00000002
 126 #define L2CAP_FEAT_BIDIR_QOS    0x00000004
 127 #define L2CAP_FEAT_ERTM         0x00000008
 128 #define L2CAP_FEAT_STREAMING    0x00000010
 129 #define L2CAP_FEAT_FCS          0x00000020
 130 #define L2CAP_FEAT_EXT_FLOW     0x00000040
 131 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
 132 #define L2CAP_FEAT_EXT_WINDOW   0x00000100
 133 #define L2CAP_FEAT_UCD          0x00000200
 134
 135 /* L2CAP checksum option */
 136 #define L2CAP_FCS_NONE          0x00
 137 #define L2CAP_FCS_CRC16         0x01
 138
 139 /* L2CAP fixed channels */
 140 #define L2CAP_FC_SIG_BREDR      0x02
 141 #define L2CAP_FC_CONNLESS       0x04
 142 #define L2CAP_FC_A2MP           0x08
 143 #define L2CAP_FC_ATT            0x10
 144 #define L2CAP_FC_SIG_LE         0x20
 145 #define L2CAP_FC_SMP_LE         0x40
 146 #define L2CAP_FC_SMP_BREDR      0x80
 147
 148 /* L2CAP Control Field bit masks */
 149 #define L2CAP_CTRL_SAR                  0xC000
 150 #define L2CAP_CTRL_REQSEQ               0x3F00
 151 #define L2CAP_CTRL_TXSEQ                0x007E
 152 #define L2CAP_CTRL_SUPERVISE            0x000C
 153
 154 #define L2CAP_CTRL_RETRANS              0x0080
 155 #define L2CAP_CTRL_FINAL                0x0080
 156 #define L2CAP_CTRL_POLL                 0x0010
 157 #define L2CAP_CTRL_FRAME_TYPE           0x0001 /* I- or S-Frame */
 158
 159 #define L2CAP_CTRL_TXSEQ_SHIFT          1
 160 #define L2CAP_CTRL_SUPER_SHIFT          2
 161 #define L2CAP_CTRL_POLL_SHIFT           4
 162 #define L2CAP_CTRL_FINAL_SHIFT          7
 163 #define L2CAP_CTRL_REQSEQ_SHIFT         8
 164 #define L2CAP_CTRL_SAR_SHIFT            14
 165
 166 /* L2CAP Extended Control Field bit mask */
 167 #define L2CAP_EXT_CTRL_TXSEQ            0xFFFC0000
 168 #define L2CAP_EXT_CTRL_SAR              0x00030000
 169 #define L2CAP_EXT_CTRL_SUPERVISE        0x00030000
 170 #define L2CAP_EXT_CTRL_REQSEQ           0x0000FFFC
 171
 172 #define L2CAP_EXT_CTRL_POLL             0x00040000
 173 #define L2CAP_EXT_CTRL_FINAL            0x00000002
 174 #define L2CAP_EXT_CTRL_FRAME_TYPE       0x00000001 /* I- or S-Frame */
 175
 176 #define L2CAP_EXT_CTRL_FINAL_SHIFT      1
 177 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT     2
 178 #define L2CAP_EXT_CTRL_SAR_SHIFT        16
 179 #define L2CAP_EXT_CTRL_SUPER_SHIFT      16
 180 #define L2CAP_EXT_CTRL_POLL_SHIFT       18
 181 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT      18
 182
 183 /* L2CAP Supervisory Function */
 184 #define L2CAP_SUPER_RR          0x00
 185 #define L2CAP_SUPER_REJ         0x01
 186 #define L2CAP_SUPER_RNR         0x02
 187 #define L2CAP_SUPER_SREJ        0x03
 188
 189 /* L2CAP Segmentation and Reassembly */
 190 #define L2CAP_SAR_UNSEGMENTED   0x00
 191 #define L2CAP_SAR_START         0x01
 192 #define L2CAP_SAR_END           0x02
 193 #define L2CAP_SAR_CONTINUE      0x03
 194
 195 /* L2CAP Command rej. reasons */
 196 #define L2CAP_REJ_NOT_UNDERSTOOD        0x0000
 197 #define L2CAP_REJ_MTU_EXCEEDED          0x0001
 198 #define L2CAP_REJ_INVALID_CID           0x0002
 199
 200 /* L2CAP structures */
 201 struct l2cap_hdr {
 202         __le16     len;
 203         __le16     cid;
 204 } __packed;
 205 #define L2CAP_HDR_SIZE          4
 206 #define L2CAP_ENH_HDR_SIZE      6
 207 #define L2CAP_EXT_HDR_SIZE      8
 208
 209 #define L2CAP_FCS_SIZE          2
 210 #define L2CAP_SDULEN_SIZE       2
 211 #define L2CAP_PSMLEN_SIZE       2
 212 #define L2CAP_ENH_CTRL_SIZE     2
 213 #define L2CAP_EXT_CTRL_SIZE     4
 214
 215 struct l2cap_cmd_hdr {
 216         __u8       code;
 217         __u8       ident;
 218         __le16     len;
 219 } __packed;
 220 #define L2CAP_CMD_HDR_SIZE      4
 221
 222 struct l2cap_cmd_rej_unk {
 223         __le16     reason;
 224 } __packed;
 225
 226 struct l2cap_cmd_rej_mtu {
 227         __le16     reason;
 228         __le16     max_mtu;
 229 } __packed;
 230
 231 struct l2cap_cmd_rej_cid {
 232         __le16     reason;
 233         __le16     scid;
 234         __le16     dcid;
 235 } __packed;
 236
 237 struct l2cap_conn_req {
 238         __le16     psm;
 239         __le16     scid;
 240 } __packed;
 241
 242 struct l2cap_conn_rsp {
 243         __le16     dcid;
 244         __le16     scid;
 245         __le16     result;
 246         __le16     status;
 247 } __packed;
 248
 249 /* protocol/service multiplexer (PSM) */
 250 #define L2CAP_PSM_SDP           0x0001
 251 #define L2CAP_PSM_RFCOMM        0x0003
 252 #define L2CAP_PSM_3DSP          0x0021
 253 #define L2CAP_PSM_IPSP          0x0023 /* 6LoWPAN */
 254
 255 #define L2CAP_PSM_DYN_START     0x1001
 256 #define L2CAP_PSM_DYN_END       0xffff
 257 #define L2CAP_PSM_AUTO_END      0x10ff
 258 #define L2CAP_PSM_LE_DYN_START  0x0080
 259 #define L2CAP_PSM_LE_DYN_END    0x00ff
 260
 261 /* channel identifier */
 262 #define L2CAP_CID_SIGNALING     0x0001
 263 #define L2CAP_CID_CONN_LESS     0x0002
 264 #define L2CAP_CID_A2MP          0x0003
 265 #define L2CAP_CID_ATT           0x0004
 266 #define L2CAP_CID_LE_SIGNALING  0x0005
 267 #define L2CAP_CID_SMP           0x0006
 268 #define L2CAP_CID_SMP_BREDR     0x0007
 269 #define L2CAP_CID_DYN_START     0x0040
 270 #define L2CAP_CID_DYN_END       0xffff
 271 #define L2CAP_CID_LE_DYN_END    0x007f
 272
 273 /* connect/create channel results */
 274 #define L2CAP_CR_SUCCESS        0x0000
 275 #define L2CAP_CR_PEND           0x0001
 276 #define L2CAP_CR_BAD_PSM        0x0002
 277 #define L2CAP_CR_SEC_BLOCK      0x0003
 278 #define L2CAP_CR_NO_MEM         0x0004
 279 #define L2CAP_CR_BAD_AMP        0x0005
 280 #define L2CAP_CR_AUTHENTICATION 0x0005
 281 #define L2CAP_CR_AUTHORIZATION  0x0006
 282 #define L2CAP_CR_BAD_KEY_SIZE   0x0007
 283 #define L2CAP_CR_ENCRYPTION     0x0008
 284 #define L2CAP_CR_INVALID_SCID   0x0009
 285 #define L2CAP_CR_SCID_IN_USE    0x0010
 286
 287 /* connect/create channel status */
 288 #define L2CAP_CS_NO_INFO        0x0000
 289 #define L2CAP_CS_AUTHEN_PEND    0x0001
 290 #define L2CAP_CS_AUTHOR_PEND    0x0002
 291
 292 struct l2cap_conf_req {
 293         __le16     dcid;
 294         __le16     flags;
 295         __u8       data[0];
 296 } __packed;
 297
 298 struct l2cap_conf_rsp {
 299         __le16     scid;
 300         __le16     flags;
 301         __le16     result;
 302         __u8       data[0];
 303 } __packed;
 304
 305 #define L2CAP_CONF_SUCCESS      0x0000
 306 #define L2CAP_CONF_UNACCEPT     0x0001
 307 #define L2CAP_CONF_REJECT       0x0002
 308 #define L2CAP_CONF_UNKNOWN      0x0003
 309 #define L2CAP_CONF_PENDING      0x0004
 310 #define L2CAP_CONF_EFS_REJECT   0x0005
 311
 312 /* configuration req/rsp continuation flag */
 313 #define L2CAP_CONF_FLAG_CONTINUATION    0x0001
 314
 315 struct l2cap_conf_opt {
 316         __u8       type;
 317         __u8       len;
 318         __u8       val[0];
 319 } __packed;
 320 #define L2CAP_CONF_OPT_SIZE     2
 321
 322 #define L2CAP_CONF_HINT         0x80
 323 #define L2CAP_CONF_MASK         0x7f
 324
 325 #define L2CAP_CONF_MTU          0x01
 326 #define L2CAP_CONF_FLUSH_TO     0x02
 327 #define L2CAP_CONF_QOS          0x03
 328 #define L2CAP_CONF_RFC          0x04
 329 #define L2CAP_CONF_FCS          0x05
 330 #define L2CAP_CONF_EFS          0x06
 331 #define L2CAP_CONF_EWS          0x07
 332
 333 #define L2CAP_CONF_MAX_SIZE     22
 334
 335 struct l2cap_conf_rfc {
 336         __u8       mode;
 337         __u8       txwin_size;
 338         __u8       max_transmit;
 339         __le16     retrans_timeout;
 340         __le16     monitor_timeout;
 341         __le16     max_pdu_size;
 342 } __packed;
 343
 344 #define L2CAP_MODE_BASIC        0x00
 345 #define L2CAP_MODE_RETRANS      0x01
 346 #define L2CAP_MODE_FLOWCTL      0x02
 347 #define L2CAP_MODE_ERTM         0x03
 348 #define L2CAP_MODE_STREAMING    0x04
 349
 350 /* Unlike the above this one doesn't actually map to anything that would
 351  * ever be sent over the air. Therefore, use a value that's unlikely to
 352  * ever be used in the BR/EDR configuration phase.
 353  */
 354 #define L2CAP_MODE_LE_FLOWCTL   0x80
 355
 356 struct l2cap_conf_efs {
 357         __u8    id;
 358         __u8    stype;
 359         __le16  msdu;
 360         __le32  sdu_itime;
 361         __le32  acc_lat;
 362         __le32  flush_to;
 363 } __packed;
 364
 365 #define L2CAP_SERV_NOTRAFIC     0x00
 366 #define L2CAP_SERV_BESTEFFORT   0x01
 367 #define L2CAP_SERV_GUARANTEED   0x02
 368
 369 #define L2CAP_BESTEFFORT_ID     0x01
 370
 371 struct l2cap_disconn_req {
 372         __le16     dcid;
 373         __le16     scid;
 374 } __packed;
 375
 376 struct l2cap_disconn_rsp {
 377         __le16     dcid;
 378         __le16     scid;
 379 } __packed;
 380
 381 struct l2cap_info_req {
 382         __le16      type;
 383 } __packed;
 384
 385 struct l2cap_info_rsp {
 386         __le16      type;
 387         __le16      result;
 388         __u8        data[0];
 389 } __packed;
 390
 391 struct l2cap_create_chan_req {
 392         __le16      psm;
 393         __le16      scid;
 394         __u8        amp_id;
 395 } __packed;
 396
 397 struct l2cap_create_chan_rsp {
 398         __le16      dcid;
 399         __le16      scid;
 400         __le16      result;
 401         __le16      status;
 402 } __packed;
 403
 404 struct l2cap_move_chan_req {
 405         __le16      icid;
 406         __u8        dest_amp_id;
 407 } __packed;
 408
 409 struct l2cap_move_chan_rsp {
 410         __le16      icid;
 411         __le16      result;
 412 } __packed;
 413
 414 #define L2CAP_MR_SUCCESS        0x0000
 415 #define L2CAP_MR_PEND           0x0001
 416 #define L2CAP_MR_BAD_ID         0x0002
 417 #define L2CAP_MR_SAME_ID        0x0003
 418 #define L2CAP_MR_NOT_SUPP       0x0004
 419 #define L2CAP_MR_COLLISION      0x0005
 420 #define L2CAP_MR_NOT_ALLOWED    0x0006
 421
 422 struct l2cap_move_chan_cfm {
 423         __le16      icid;
 424         __le16      result;
 425 } __packed;
 426
 427 #define L2CAP_MC_CONFIRMED      0x0000
 428 #define L2CAP_MC_UNCONFIRMED    0x0001
 429
 430 struct l2cap_move_chan_cfm_rsp {
 431         __le16      icid;
 432 } __packed;
 433
 434 /* info type */
 435 #define L2CAP_IT_CL_MTU         0x0001
 436 #define L2CAP_IT_FEAT_MASK      0x0002
 437 #define L2CAP_IT_FIXED_CHAN     0x0003
 438
 439 /* info result */
 440 #define L2CAP_IR_SUCCESS        0x0000
 441 #define L2CAP_IR_NOTSUPP        0x0001
 442
 443 struct l2cap_conn_param_update_req {
 444         __le16      min;
 445         __le16      max;
 446         __le16      latency;
 447         __le16      to_multiplier;
 448 } __packed;
 449
 450 struct l2cap_conn_param_update_rsp {
 451         __le16      result;
 452 } __packed;
 453
 454 /* Connection Parameters result */
 455 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 456 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 457
 458 #define L2CAP_LE_MAX_CREDITS            10
 459 #define L2CAP_LE_DEFAULT_MPS            230
 460
 461 struct l2cap_le_conn_req {
 462         __le16     psm;
 463         __le16     scid;
 464         __le16     mtu;
 465         __le16     mps;
 466         __le16     credits;
 467 } __packed;
 468
 469 struct l2cap_le_conn_rsp {
 470         __le16     dcid;
 471         __le16     mtu;
 472         __le16     mps;
 473         __le16     credits;
 474         __le16     result;
 475 } __packed;
 476
 477 struct l2cap_le_credits {
 478         __le16     cid;
 479         __le16     credits;
 480 } __packed;
 481
 482 /* ----- L2CAP channels and connections ----- */
 483 struct l2cap_seq_list {
 484         __u16   head;
 485         __u16   tail;
 486         __u16   mask;
 487         __u16   *list;
 488 };
 489
 490 #define L2CAP_SEQ_LIST_CLEAR    0xFFFF
 491 #define L2CAP_SEQ_LIST_TAIL     0x8000
 492
 493 struct l2cap_chan {
 494         struct l2cap_conn       *conn;
 495         struct hci_conn         *hs_hcon;
 496         struct hci_chan         *hs_hchan;
 497         struct kref     kref;
 498         atomic_t        nesting;
 499
 500         __u8            state;
 501
 502         bdaddr_t        dst;
 503         __u8            dst_type;
 504         bdaddr_t        src;
 505         __u8            src_type;
 506         __le16          psm;
 507         __le16          sport;
 508         __u16           dcid;
 509         __u16           scid;
 510
 511         __u16           imtu;
 512         __u16           omtu;
 513         __u16           flush_to;
 514         __u8            mode;
 515         __u8            chan_type;
 516         __u8            chan_policy;
 517
 518         __u8            sec_level;
 519
 520         __u8            ident;
 521
 522         __u8            conf_req[64];
 523         __u8            conf_len;
 524         __u8            num_conf_req;
 525         __u8            num_conf_rsp;
 526
 527         __u8            fcs;
 528
 529         __u16           tx_win;
 530         __u16           tx_win_max;
 531         __u16           ack_win;
 532         __u8            max_tx;
 533         __u16           retrans_timeout;
 534         __u16           monitor_timeout;
 535         __u16           mps;
 536
 537         __u16           tx_credits;
 538         __u16           rx_credits;
 539
 540         __u8            tx_state;
 541         __u8            rx_state;
 542
 543         unsigned long   conf_state;
 544         unsigned long   conn_state;
 545         unsigned long   flags;
 546
 547         __u8            remote_amp_id;
 548         __u8            local_amp_id;
 549         __u8            move_id;
 550         __u8            move_state;
 551         __u8            move_role;
 552
 553         __u16           next_tx_seq;
 554         __u16           expected_ack_seq;
 555         __u16           expected_tx_seq;
 556         __u16           buffer_seq;
 557         __u16           srej_save_reqseq;
 558         __u16           last_acked_seq;
 559         __u16           frames_sent;
 560         __u16           unacked_frames;
 561         __u8            retry_count;
 562         __u16           sdu_len;
 563         struct sk_buff  *sdu;
 564         struct sk_buff  *sdu_last_frag;
 565
 566         __u16           remote_tx_win;
 567         __u8            remote_max_tx;
 568         __u16           remote_mps;
 569
 570         __u8            local_id;
 571         __u8            local_stype;
 572         __u16           local_msdu;
 573         __u32           local_sdu_itime;
 574         __u32           local_acc_lat;
 575         __u32           local_flush_to;
 576
 577         __u8            remote_id;
 578         __u8            remote_stype;
 579         __u16           remote_msdu;
 580         __u32           remote_sdu_itime;
 581         __u32           remote_acc_lat;
 582         __u32           remote_flush_to;
 583
 584         struct delayed_work     chan_timer;
 585         struct delayed_work     retrans_timer;
 586         struct delayed_work     monitor_timer;
 587         struct delayed_work     ack_timer;
 588
 589         struct sk_buff          *tx_send_head;
 590         struct sk_buff_head     tx_q;
 591         struct sk_buff_head     srej_q;
 592         struct l2cap_seq_list   srej_list;
 593         struct l2cap_seq_list   retrans_list;
 594
 595         struct list_head        list;
 596         struct list_head        global_l;
 597
 598         void                    *data;
 599         const struct l2cap_ops  *ops;
 600         struct mutex            lock;
 601 };
 602
 603 struct l2cap_ops {
 604         char                    *name;
 605
 606         struct l2cap_chan       *(*new_connection) (struct l2cap_chan *chan);
 607         int                     (*recv) (struct l2cap_chan * chan,
 608                                          struct sk_buff *skb);
 609         void                    (*teardown) (struct l2cap_chan *chan, int err);
 610         void                    (*close) (struct l2cap_chan *chan);
 611         void                    (*state_change) (struct l2cap_chan *chan,
 612                                                  int state, int err);
 613         void                    (*ready) (struct l2cap_chan *chan);
 614         void                    (*defer) (struct l2cap_chan *chan);
 615         void                    (*resume) (struct l2cap_chan *chan);
 616         void                    (*suspend) (struct l2cap_chan *chan);
 617         void                    (*set_shutdown) (struct l2cap_chan *chan);
 618         long                    (*get_sndtimeo) (struct l2cap_chan *chan);
 619         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 620                                                unsigned long hdr_len,
 621                                                unsigned long len, int nb);
 622 };
 623
 624 struct l2cap_conn {
 625         struct hci_conn         *hcon;
 626         struct hci_chan         *hchan;
 627
 628         unsigned int            mtu;
 629
 630         __u32                   feat_mask;
 631         __u8                    remote_fixed_chan;
 632         __u8                    local_fixed_chan;
 633
 634         __u8                    info_state;
 635         __u8                    info_ident;
 636
 637         struct delayed_work     info_timer;
 638
 639         struct sk_buff          *rx_skb;
 640         __u32                   rx_len;
 641         __u8                    tx_ident;
 642         struct mutex            ident_lock;
 643
 644         struct sk_buff_head     pending_rx;
 645         struct work_struct      pending_rx_work;
 646
 647         struct work_struct      id_addr_update_work;
 648
 649         __u8                    disc_reason;
 650
 651         struct l2cap_chan       *smp;
 652
 653         struct list_head        chan_l;
 654         struct mutex            chan_lock;
 655         struct kref             ref;
 656         struct list_head        users;
 657 };
 658
 659 struct l2cap_user {
 660         struct list_head list;
 661         int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
 662         void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
 663 };
 664
 665 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 666 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 667 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 668
 669 #define L2CAP_CHAN_RAW                  1
 670 #define L2CAP_CHAN_CONN_LESS            2
 671 #define L2CAP_CHAN_CONN_ORIENTED        3
 672 #define L2CAP_CHAN_FIXED                4
 673
 674 /* ----- L2CAP socket info ----- */
 675 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 676
 677 struct l2cap_pinfo {
 678         struct bt_sock          bt;
 679         struct l2cap_chan       *chan;
 680         struct sk_buff          *rx_busy_skb;
 681 };
 682
 683 enum {
 684         CONF_REQ_SENT,
 685         CONF_INPUT_DONE,
 686         CONF_OUTPUT_DONE,
 687         CONF_MTU_DONE,
 688         CONF_MODE_DONE,
 689         CONF_CONNECT_PEND,
 690         CONF_RECV_NO_FCS,
 691         CONF_STATE2_DEVICE,
 692         CONF_EWS_RECV,
 693         CONF_LOC_CONF_PEND,
 694         CONF_REM_CONF_PEND,
 695         CONF_NOT_COMPLETE,
 696 };
 697
 698 #define L2CAP_CONF_MAX_CONF_REQ 2
 699 #define L2CAP_CONF_MAX_CONF_RSP 2
 700
 701 enum {
 702         CONN_SREJ_SENT,
 703         CONN_WAIT_F,
 704         CONN_SREJ_ACT,
 705         CONN_SEND_PBIT,
 706         CONN_REMOTE_BUSY,
 707         CONN_LOCAL_BUSY,
 708         CONN_REJ_ACT,
 709         CONN_SEND_FBIT,
 710         CONN_RNR_SENT,
 711 };
 712
 713 /* Definitions for flags in l2cap_chan */
 714 enum {
 715         FLAG_ROLE_SWITCH,
 716         FLAG_FORCE_ACTIVE,
 717         FLAG_FORCE_RELIABLE,
 718         FLAG_FLUSHABLE,
 719         FLAG_EXT_CTRL,
 720         FLAG_EFS_ENABLE,
 721         FLAG_DEFER_SETUP,
 722         FLAG_LE_CONN_REQ_SENT,
 723         FLAG_PENDING_SECURITY,
 724         FLAG_HOLD_HCI_CONN,
 725 };
 726
 727 /* Lock nesting levels for L2CAP channels. We need these because lockdep
 728  * otherwise considers all channels equal and will e.g. complain about a
 729  * connection oriented channel triggering SMP procedures or a listening
 730  * channel creating and locking a child channel.
 731  */
 732 enum {
 733         L2CAP_NESTING_SMP,
 734         L2CAP_NESTING_NORMAL,
 735         L2CAP_NESTING_PARENT,
 736 };
 737
 738 enum {
 739         L2CAP_TX_STATE_XMIT,
 740         L2CAP_TX_STATE_WAIT_F,
 741 };
 742
 743 enum {
 744         L2CAP_RX_STATE_RECV,
 745         L2CAP_RX_STATE_SREJ_SENT,
 746         L2CAP_RX_STATE_MOVE,
 747         L2CAP_RX_STATE_WAIT_P,
 748         L2CAP_RX_STATE_WAIT_F,
 749 };
 750
 751 enum {
 752         L2CAP_TXSEQ_EXPECTED,
 753         L2CAP_TXSEQ_EXPECTED_SREJ,
 754         L2CAP_TXSEQ_UNEXPECTED,
 755         L2CAP_TXSEQ_UNEXPECTED_SREJ,
 756         L2CAP_TXSEQ_DUPLICATE,
 757         L2CAP_TXSEQ_DUPLICATE_SREJ,
 758         L2CAP_TXSEQ_INVALID,
 759         L2CAP_TXSEQ_INVALID_IGNORE,
 760 };
 761
 762 enum {
 763         L2CAP_EV_DATA_REQUEST,
 764         L2CAP_EV_LOCAL_BUSY_DETECTED,
 765         L2CAP_EV_LOCAL_BUSY_CLEAR,
 766         L2CAP_EV_RECV_REQSEQ_AND_FBIT,
 767         L2CAP_EV_RECV_FBIT,
 768         L2CAP_EV_RETRANS_TO,
 769         L2CAP_EV_MONITOR_TO,
 770         L2CAP_EV_EXPLICIT_POLL,
 771         L2CAP_EV_RECV_IFRAME,
 772         L2CAP_EV_RECV_RR,
 773         L2CAP_EV_RECV_REJ,
 774         L2CAP_EV_RECV_RNR,
 775         L2CAP_EV_RECV_SREJ,
 776         L2CAP_EV_RECV_FRAME,
 777 };
 778
 779 enum {
 780         L2CAP_MOVE_ROLE_NONE,
 781         L2CAP_MOVE_ROLE_INITIATOR,
 782         L2CAP_MOVE_ROLE_RESPONDER,
 783 };
 784
 785 enum {
 786         L2CAP_MOVE_STABLE,
 787         L2CAP_MOVE_WAIT_REQ,
 788         L2CAP_MOVE_WAIT_RSP,
 789         L2CAP_MOVE_WAIT_RSP_SUCCESS,
 790         L2CAP_MOVE_WAIT_CONFIRM,
 791         L2CAP_MOVE_WAIT_CONFIRM_RSP,
 792         L2CAP_MOVE_WAIT_LOGICAL_COMP,
 793         L2CAP_MOVE_WAIT_LOGICAL_CFM,
 794         L2CAP_MOVE_WAIT_LOCAL_BUSY,
 795         L2CAP_MOVE_WAIT_PREPARE,
 796 };
 797
 798 void l2cap_chan_hold(struct l2cap_chan *c);
 799 void l2cap_chan_put(struct l2cap_chan *c);
 800
 801 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 802 {
 803         mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
 804 }
 805
 806 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 807 {
 808         mutex_unlock(&chan->lock);
 809 }
 810
 811 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 812                                    struct delayed_work *work, long timeout)
 813 {
 814         BT_DBG("chan %p state %s timeout %ld", chan,
 815                state_to_string(chan->state), timeout);
 816
 817         /* If delayed work cancelled do not hold(chan)
 818            since it is already done with previous set_timer */
 819         if (!cancel_delayed_work(work))
 820                 l2cap_chan_hold(chan);
 821
 822         schedule_delayed_work(work, timeout);
 823 }
 824
 825 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 826                                      struct delayed_work *work)
 827 {
 828         bool ret;
 829
 830         /* put(chan) if delayed work cancelled otherwise it
 831            is done in delayed work function */
 832         ret = cancel_delayed_work(work);
 833         if (ret)
 834                 l2cap_chan_put(chan);
 835
 836         return ret;
 837 }
 838
 839 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 840 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 841 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 842 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 843 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 844                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 845 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 846
 847 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 848 {
 849         if (seq1 >= seq2)
 850                 return seq1 - seq2;
 851         else
 852                 return chan->tx_win_max + 1 - seq2 + seq1;
 853 }
 854
 855 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 856 {
 857         return (seq + 1) % (chan->tx_win_max + 1);
 858 }
 859
 860 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
 861 {
 862         return NULL;
 863 }
 864
 865 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
 866 {
 867         return -ENOSYS;
 868 }
 869
 870 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
 871                                                       unsigned long hdr_len,
 872                                                       unsigned long len, int nb)
 873 {
 874         return ERR_PTR(-ENOSYS);
 875 }
 876
 877 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
 878 {
 879 }
 880
 881 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
 882 {
 883 }
 884
 885 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
 886 {
 887 }
 888
 889 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
 890                                               int state, int err)
 891 {
 892 }
 893
 894 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
 895 {
 896 }
 897
 898 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
 899 {
 900 }
 901
 902 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
 903 {
 904 }
 905
 906 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
 907 {
 908 }
 909
 910 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
 911 {
 912         return 0;
 913 }
 914
 915 extern bool disable_ertm;
 916
 917 int l2cap_init_sockets(void);
 918 void l2cap_cleanup_sockets(void);
 919 bool l2cap_is_socket(struct socket *sock);
 920
 921 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
 922 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 923
 924 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 925 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 926
 927 struct l2cap_chan *l2cap_chan_create(void);
 928 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 929 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 930                        bdaddr_t *dst, u8 dst_type);
 931 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
 932 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 933 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
 934 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
 935 int l2cap_ertm_init(struct l2cap_chan *chan);
 936 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 937 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 938 void l2cap_chan_del(struct l2cap_chan *chan, int err);
 939 void l2cap_send_conn_req(struct l2cap_chan *chan);
 940 void l2cap_move_start(struct l2cap_chan *chan);
 941 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
 942                        u8 status);
 943 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
 944
 945 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
 946 void l2cap_conn_put(struct l2cap_conn *conn);
 947
 948 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
 949 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
 950
 951 #endif /* __L2CAP_H */