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_INVALID_SCID   0x0006
 281 #define L2CAP_CR_SCID_IN_USE    0x0007
 282
 283 /* credit based connect results */
 284 #define L2CAP_CR_LE_SUCCESS             0x0000
 285 #define L2CAP_CR_LE_BAD_PSM             0x0002
 286 #define L2CAP_CR_LE_NO_MEM              0x0004
 287 #define L2CAP_CR_LE_AUTHENTICATION      0x0005
 288 #define L2CAP_CR_LE_AUTHORIZATION       0x0006
 289 #define L2CAP_CR_LE_BAD_KEY_SIZE        0x0007
 290 #define L2CAP_CR_LE_ENCRYPTION          0x0008
 291 #define L2CAP_CR_LE_INVALID_SCID        0x0009
 292 #define L2CAP_CR_LE_SCID_IN_USE         0X000A
 293
 294 /* connect/create channel status */
 295 #define L2CAP_CS_NO_INFO        0x0000
 296 #define L2CAP_CS_AUTHEN_PEND    0x0001
 297 #define L2CAP_CS_AUTHOR_PEND    0x0002
 298
 299 struct l2cap_conf_req {
 300         __le16     dcid;
 301         __le16     flags;
 302         __u8       data[0];
 303 } __packed;
 304
 305 struct l2cap_conf_rsp {
 306         __le16     scid;
 307         __le16     flags;
 308         __le16     result;
 309         __u8       data[0];
 310 } __packed;
 311
 312 #define L2CAP_CONF_SUCCESS      0x0000
 313 #define L2CAP_CONF_UNACCEPT     0x0001
 314 #define L2CAP_CONF_REJECT       0x0002
 315 #define L2CAP_CONF_UNKNOWN      0x0003
 316 #define L2CAP_CONF_PENDING      0x0004
 317 #define L2CAP_CONF_EFS_REJECT   0x0005
 318
 319 /* configuration req/rsp continuation flag */
 320 #define L2CAP_CONF_FLAG_CONTINUATION    0x0001
 321
 322 struct l2cap_conf_opt {
 323         __u8       type;
 324         __u8       len;
 325         __u8       val[0];
 326 } __packed;
 327 #define L2CAP_CONF_OPT_SIZE     2
 328
 329 #define L2CAP_CONF_HINT         0x80
 330 #define L2CAP_CONF_MASK         0x7f
 331
 332 #define L2CAP_CONF_MTU          0x01
 333 #define L2CAP_CONF_FLUSH_TO     0x02
 334 #define L2CAP_CONF_QOS          0x03
 335 #define L2CAP_CONF_RFC          0x04
 336 #define L2CAP_CONF_FCS          0x05
 337 #define L2CAP_CONF_EFS          0x06
 338 #define L2CAP_CONF_EWS          0x07
 339
 340 #define L2CAP_CONF_MAX_SIZE     22
 341
 342 struct l2cap_conf_rfc {
 343         __u8       mode;
 344         __u8       txwin_size;
 345         __u8       max_transmit;
 346         __le16     retrans_timeout;
 347         __le16     monitor_timeout;
 348         __le16     max_pdu_size;
 349 } __packed;
 350
 351 #define L2CAP_MODE_BASIC        0x00
 352 #define L2CAP_MODE_RETRANS      0x01
 353 #define L2CAP_MODE_FLOWCTL      0x02
 354 #define L2CAP_MODE_ERTM         0x03
 355 #define L2CAP_MODE_STREAMING    0x04
 356
 357 /* Unlike the above this one doesn't actually map to anything that would
 358  * ever be sent over the air. Therefore, use a value that's unlikely to
 359  * ever be used in the BR/EDR configuration phase.
 360  */
 361 #define L2CAP_MODE_LE_FLOWCTL   0x80
 362
 363 struct l2cap_conf_efs {
 364         __u8    id;
 365         __u8    stype;
 366         __le16  msdu;
 367         __le32  sdu_itime;
 368         __le32  acc_lat;
 369         __le32  flush_to;
 370 } __packed;
 371
 372 #define L2CAP_SERV_NOTRAFIC     0x00
 373 #define L2CAP_SERV_BESTEFFORT   0x01
 374 #define L2CAP_SERV_GUARANTEED   0x02
 375
 376 #define L2CAP_BESTEFFORT_ID     0x01
 377
 378 struct l2cap_disconn_req {
 379         __le16     dcid;
 380         __le16     scid;
 381 } __packed;
 382
 383 struct l2cap_disconn_rsp {
 384         __le16     dcid;
 385         __le16     scid;
 386 } __packed;
 387
 388 struct l2cap_info_req {
 389         __le16      type;
 390 } __packed;
 391
 392 struct l2cap_info_rsp {
 393         __le16      type;
 394         __le16      result;
 395         __u8        data[0];
 396 } __packed;
 397
 398 struct l2cap_create_chan_req {
 399         __le16      psm;
 400         __le16      scid;
 401         __u8        amp_id;
 402 } __packed;
 403
 404 struct l2cap_create_chan_rsp {
 405         __le16      dcid;
 406         __le16      scid;
 407         __le16      result;
 408         __le16      status;
 409 } __packed;
 410
 411 struct l2cap_move_chan_req {
 412         __le16      icid;
 413         __u8        dest_amp_id;
 414 } __packed;
 415
 416 struct l2cap_move_chan_rsp {
 417         __le16      icid;
 418         __le16      result;
 419 } __packed;
 420
 421 #define L2CAP_MR_SUCCESS        0x0000
 422 #define L2CAP_MR_PEND           0x0001
 423 #define L2CAP_MR_BAD_ID         0x0002
 424 #define L2CAP_MR_SAME_ID        0x0003
 425 #define L2CAP_MR_NOT_SUPP       0x0004
 426 #define L2CAP_MR_COLLISION      0x0005
 427 #define L2CAP_MR_NOT_ALLOWED    0x0006
 428
 429 struct l2cap_move_chan_cfm {
 430         __le16      icid;
 431         __le16      result;
 432 } __packed;
 433
 434 #define L2CAP_MC_CONFIRMED      0x0000
 435 #define L2CAP_MC_UNCONFIRMED    0x0001
 436
 437 struct l2cap_move_chan_cfm_rsp {
 438         __le16      icid;
 439 } __packed;
 440
 441 /* info type */
 442 #define L2CAP_IT_CL_MTU         0x0001
 443 #define L2CAP_IT_FEAT_MASK      0x0002
 444 #define L2CAP_IT_FIXED_CHAN     0x0003
 445
 446 /* info result */
 447 #define L2CAP_IR_SUCCESS        0x0000
 448 #define L2CAP_IR_NOTSUPP        0x0001
 449
 450 struct l2cap_conn_param_update_req {
 451         __le16      min;
 452         __le16      max;
 453         __le16      latency;
 454         __le16      to_multiplier;
 455 } __packed;
 456
 457 struct l2cap_conn_param_update_rsp {
 458         __le16      result;
 459 } __packed;
 460
 461 /* Connection Parameters result */
 462 #define L2CAP_CONN_PARAM_ACCEPTED       0x0000
 463 #define L2CAP_CONN_PARAM_REJECTED       0x0001
 464
 465 struct l2cap_le_conn_req {
 466         __le16     psm;
 467         __le16     scid;
 468         __le16     mtu;
 469         __le16     mps;
 470         __le16     credits;
 471 } __packed;
 472
 473 struct l2cap_le_conn_rsp {
 474         __le16     dcid;
 475         __le16     mtu;
 476         __le16     mps;
 477         __le16     credits;
 478         __le16     result;
 479 } __packed;
 480
 481 struct l2cap_le_credits {
 482         __le16     cid;
 483         __le16     credits;
 484 } __packed;
 485
 486 /* ----- L2CAP channels and connections ----- */
 487 struct l2cap_seq_list {
 488         __u16   head;
 489         __u16   tail;
 490         __u16   mask;
 491         __u16   *list;
 492 };
 493
 494 #define L2CAP_SEQ_LIST_CLEAR    0xFFFF
 495 #define L2CAP_SEQ_LIST_TAIL     0x8000
 496
 497 struct l2cap_chan {
 498         struct l2cap_conn       *conn;
 499         struct hci_conn         *hs_hcon;
 500         struct hci_chan         *hs_hchan;
 501         struct kref     kref;
 502         atomic_t        nesting;
 503
 504         __u8            state;
 505
 506         bdaddr_t        dst;
 507         __u8            dst_type;
 508         bdaddr_t        src;
 509         __u8            src_type;
 510         __le16          psm;
 511         __le16          sport;
 512         __u16           dcid;
 513         __u16           scid;
 514
 515         __u16           imtu;
 516         __u16           omtu;
 517         __u16           flush_to;
 518         __u8            mode;
 519         __u8            chan_type;
 520         __u8            chan_policy;
 521
 522         __u8            sec_level;
 523
 524         __u8            ident;
 525
 526         __u8            conf_req[64];
 527         __u8            conf_len;
 528         __u8            num_conf_req;
 529         __u8            num_conf_rsp;
 530
 531         __u8            fcs;
 532
 533         __u16           tx_win;
 534         __u16           tx_win_max;
 535         __u16           ack_win;
 536         __u8            max_tx;
 537         __u16           retrans_timeout;
 538         __u16           monitor_timeout;
 539         __u16           mps;
 540
 541         __u16           tx_credits;
 542         __u16           rx_credits;
 543
 544         __u8            tx_state;
 545         __u8            rx_state;
 546
 547         unsigned long   conf_state;
 548         unsigned long   conn_state;
 549         unsigned long   flags;
 550
 551         __u8            remote_amp_id;
 552         __u8            local_amp_id;
 553         __u8            move_id;
 554         __u8            move_state;
 555         __u8            move_role;
 556
 557         __u16           next_tx_seq;
 558         __u16           expected_ack_seq;
 559         __u16           expected_tx_seq;
 560         __u16           buffer_seq;
 561         __u16           srej_save_reqseq;
 562         __u16           last_acked_seq;
 563         __u16           frames_sent;
 564         __u16           unacked_frames;
 565         __u8            retry_count;
 566         __u16           sdu_len;
 567         struct sk_buff  *sdu;
 568         struct sk_buff  *sdu_last_frag;
 569
 570         __u16           remote_tx_win;
 571         __u8            remote_max_tx;
 572         __u16           remote_mps;
 573
 574         __u8            local_id;
 575         __u8            local_stype;
 576         __u16           local_msdu;
 577         __u32           local_sdu_itime;
 578         __u32           local_acc_lat;
 579         __u32           local_flush_to;
 580
 581         __u8            remote_id;
 582         __u8            remote_stype;
 583         __u16           remote_msdu;
 584         __u32           remote_sdu_itime;
 585         __u32           remote_acc_lat;
 586         __u32           remote_flush_to;
 587
 588         struct delayed_work     chan_timer;
 589         struct delayed_work     retrans_timer;
 590         struct delayed_work     monitor_timer;
 591         struct delayed_work     ack_timer;
 592
 593         struct sk_buff          *tx_send_head;
 594         struct sk_buff_head     tx_q;
 595         struct sk_buff_head     srej_q;
 596         struct l2cap_seq_list   srej_list;
 597         struct l2cap_seq_list   retrans_list;
 598
 599         struct list_head        list;
 600         struct list_head        global_l;
 601
 602         void                    *data;
 603         const struct l2cap_ops  *ops;
 604         struct mutex            lock;
 605 };
 606
 607 struct l2cap_ops {
 608         char                    *name;
 609
 610         struct l2cap_chan       *(*new_connection) (struct l2cap_chan *chan);
 611         int                     (*recv) (struct l2cap_chan * chan,
 612                                          struct sk_buff *skb);
 613         void                    (*teardown) (struct l2cap_chan *chan, int err);
 614         void                    (*close) (struct l2cap_chan *chan);
 615         void                    (*state_change) (struct l2cap_chan *chan,
 616                                                  int state, int err);
 617         void                    (*ready) (struct l2cap_chan *chan);
 618         void                    (*defer) (struct l2cap_chan *chan);
 619         void                    (*resume) (struct l2cap_chan *chan);
 620         void                    (*suspend) (struct l2cap_chan *chan);
 621         void                    (*set_shutdown) (struct l2cap_chan *chan);
 622         long                    (*get_sndtimeo) (struct l2cap_chan *chan);
 623         struct sk_buff          *(*alloc_skb) (struct l2cap_chan *chan,
 624                                                unsigned long hdr_len,
 625                                                unsigned long len, int nb);
 626 };
 627
 628 struct l2cap_conn {
 629         struct hci_conn         *hcon;
 630         struct hci_chan         *hchan;
 631
 632         unsigned int            mtu;
 633
 634         __u32                   feat_mask;
 635         __u8                    remote_fixed_chan;
 636         __u8                    local_fixed_chan;
 637
 638         __u8                    info_state;
 639         __u8                    info_ident;
 640
 641         struct delayed_work     info_timer;
 642
 643         struct sk_buff          *rx_skb;
 644         __u32                   rx_len;
 645         __u8                    tx_ident;
 646         struct mutex            ident_lock;
 647
 648         struct sk_buff_head     pending_rx;
 649         struct work_struct      pending_rx_work;
 650
 651         struct work_struct      id_addr_update_work;
 652
 653         __u8                    disc_reason;
 654
 655         struct l2cap_chan       *smp;
 656
 657         struct list_head        chan_l;
 658         struct mutex            chan_lock;
 659         struct kref             ref;
 660         struct list_head        users;
 661 };
 662
 663 struct l2cap_user {
 664         struct list_head list;
 665         int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
 666         void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
 667 };
 668
 669 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 670 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 671 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 672
 673 #define L2CAP_CHAN_RAW                  1
 674 #define L2CAP_CHAN_CONN_LESS            2
 675 #define L2CAP_CHAN_CONN_ORIENTED        3
 676 #define L2CAP_CHAN_FIXED                4
 677
 678 /* ----- L2CAP socket info ----- */
 679 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 680
 681 struct l2cap_pinfo {
 682         struct bt_sock          bt;
 683         struct l2cap_chan       *chan;
 684         struct sk_buff          *rx_busy_skb;
 685 };
 686
 687 enum {
 688         CONF_REQ_SENT,
 689         CONF_INPUT_DONE,
 690         CONF_OUTPUT_DONE,
 691         CONF_MTU_DONE,
 692         CONF_MODE_DONE,
 693         CONF_CONNECT_PEND,
 694         CONF_RECV_NO_FCS,
 695         CONF_STATE2_DEVICE,
 696         CONF_EWS_RECV,
 697         CONF_LOC_CONF_PEND,
 698         CONF_REM_CONF_PEND,
 699         CONF_NOT_COMPLETE,
 700 };
 701
 702 #define L2CAP_CONF_MAX_CONF_REQ 2
 703 #define L2CAP_CONF_MAX_CONF_RSP 2
 704
 705 enum {
 706         CONN_SREJ_SENT,
 707         CONN_WAIT_F,
 708         CONN_SREJ_ACT,
 709         CONN_SEND_PBIT,
 710         CONN_REMOTE_BUSY,
 711         CONN_LOCAL_BUSY,
 712         CONN_REJ_ACT,
 713         CONN_SEND_FBIT,
 714         CONN_RNR_SENT,
 715 };
 716
 717 /* Definitions for flags in l2cap_chan */
 718 enum {
 719         FLAG_ROLE_SWITCH,
 720         FLAG_FORCE_ACTIVE,
 721         FLAG_FORCE_RELIABLE,
 722         FLAG_FLUSHABLE,
 723         FLAG_EXT_CTRL,
 724         FLAG_EFS_ENABLE,
 725         FLAG_DEFER_SETUP,
 726         FLAG_LE_CONN_REQ_SENT,
 727         FLAG_PENDING_SECURITY,
 728         FLAG_HOLD_HCI_CONN,
 729 };
 730
 731 /* Lock nesting levels for L2CAP channels. We need these because lockdep
 732  * otherwise considers all channels equal and will e.g. complain about a
 733  * connection oriented channel triggering SMP procedures or a listening
 734  * channel creating and locking a child channel.
 735  */
 736 enum {
 737         L2CAP_NESTING_SMP,
 738         L2CAP_NESTING_NORMAL,
 739         L2CAP_NESTING_PARENT,
 740 };
 741
 742 enum {
 743         L2CAP_TX_STATE_XMIT,
 744         L2CAP_TX_STATE_WAIT_F,
 745 };
 746
 747 enum {
 748         L2CAP_RX_STATE_RECV,
 749         L2CAP_RX_STATE_SREJ_SENT,
 750         L2CAP_RX_STATE_MOVE,
 751         L2CAP_RX_STATE_WAIT_P,
 752         L2CAP_RX_STATE_WAIT_F,
 753 };
 754
 755 enum {
 756         L2CAP_TXSEQ_EXPECTED,
 757         L2CAP_TXSEQ_EXPECTED_SREJ,
 758         L2CAP_TXSEQ_UNEXPECTED,
 759         L2CAP_TXSEQ_UNEXPECTED_SREJ,
 760         L2CAP_TXSEQ_DUPLICATE,
 761         L2CAP_TXSEQ_DUPLICATE_SREJ,
 762         L2CAP_TXSEQ_INVALID,
 763         L2CAP_TXSEQ_INVALID_IGNORE,
 764 };
 765
 766 enum {
 767         L2CAP_EV_DATA_REQUEST,
 768         L2CAP_EV_LOCAL_BUSY_DETECTED,
 769         L2CAP_EV_LOCAL_BUSY_CLEAR,
 770         L2CAP_EV_RECV_REQSEQ_AND_FBIT,
 771         L2CAP_EV_RECV_FBIT,
 772         L2CAP_EV_RETRANS_TO,
 773         L2CAP_EV_MONITOR_TO,
 774         L2CAP_EV_EXPLICIT_POLL,
 775         L2CAP_EV_RECV_IFRAME,
 776         L2CAP_EV_RECV_RR,
 777         L2CAP_EV_RECV_REJ,
 778         L2CAP_EV_RECV_RNR,
 779         L2CAP_EV_RECV_SREJ,
 780         L2CAP_EV_RECV_FRAME,
 781 };
 782
 783 enum {
 784         L2CAP_MOVE_ROLE_NONE,
 785         L2CAP_MOVE_ROLE_INITIATOR,
 786         L2CAP_MOVE_ROLE_RESPONDER,
 787 };
 788
 789 enum {
 790         L2CAP_MOVE_STABLE,
 791         L2CAP_MOVE_WAIT_REQ,
 792         L2CAP_MOVE_WAIT_RSP,
 793         L2CAP_MOVE_WAIT_RSP_SUCCESS,
 794         L2CAP_MOVE_WAIT_CONFIRM,
 795         L2CAP_MOVE_WAIT_CONFIRM_RSP,
 796         L2CAP_MOVE_WAIT_LOGICAL_COMP,
 797         L2CAP_MOVE_WAIT_LOGICAL_CFM,
 798         L2CAP_MOVE_WAIT_LOCAL_BUSY,
 799         L2CAP_MOVE_WAIT_PREPARE,
 800 };
 801
 802 void l2cap_chan_hold(struct l2cap_chan *c);
 803 void l2cap_chan_put(struct l2cap_chan *c);
 804
 805 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
 806 {
 807         mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
 808 }
 809
 810 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
 811 {
 812         mutex_unlock(&chan->lock);
 813 }
 814
 815 static inline void l2cap_set_timer(struct l2cap_chan *chan,
 816                                    struct delayed_work *work, long timeout)
 817 {
 818         BT_DBG("chan %p state %s timeout %ld", chan,
 819                state_to_string(chan->state), timeout);
 820
 821         /* If delayed work cancelled do not hold(chan)
 822            since it is already done with previous set_timer */
 823         if (!cancel_delayed_work(work))
 824                 l2cap_chan_hold(chan);
 825
 826         schedule_delayed_work(work, timeout);
 827 }
 828
 829 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
 830                                      struct delayed_work *work)
 831 {
 832         bool ret;
 833
 834         /* put(chan) if delayed work cancelled otherwise it
 835            is done in delayed work function */
 836         ret = cancel_delayed_work(work);
 837         if (ret)
 838                 l2cap_chan_put(chan);
 839
 840         return ret;
 841 }
 842
 843 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
 844 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
 845 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
 846 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
 847 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
 848                 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 849 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
 850
 851 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
 852 {
 853         if (seq1 >= seq2)
 854                 return seq1 - seq2;
 855         else
 856                 return chan->tx_win_max + 1 - seq2 + seq1;
 857 }
 858
 859 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
 860 {
 861         return (seq + 1) % (chan->tx_win_max + 1);
 862 }
 863
 864 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
 865 {
 866         return NULL;
 867 }
 868
 869 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
 870 {
 871         return -ENOSYS;
 872 }
 873
 874 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
 875                                                       unsigned long hdr_len,
 876                                                       unsigned long len, int nb)
 877 {
 878         return ERR_PTR(-ENOSYS);
 879 }
 880
 881 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
 882 {
 883 }
 884
 885 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
 886 {
 887 }
 888
 889 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
 890 {
 891 }
 892
 893 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
 894                                               int state, int err)
 895 {
 896 }
 897
 898 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
 899 {
 900 }
 901
 902 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
 903 {
 904 }
 905
 906 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
 907 {
 908 }
 909
 910 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
 911 {
 912 }
 913
 914 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
 915 {
 916         return 0;
 917 }
 918
 919 extern bool disable_ertm;
 920
 921 int l2cap_init_sockets(void);
 922 void l2cap_cleanup_sockets(void);
 923 bool l2cap_is_socket(struct socket *sock);
 924
 925 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
 926 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
 927
 928 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 929 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 930
 931 struct l2cap_chan *l2cap_chan_create(void);
 932 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
 933 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 934                        bdaddr_t *dst, u8 dst_type);
 935 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
 936 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
 937 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
 938 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
 939 int l2cap_ertm_init(struct l2cap_chan *chan);
 940 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 941 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
 942 void l2cap_chan_del(struct l2cap_chan *chan, int err);
 943 void l2cap_send_conn_req(struct l2cap_chan *chan);
 944 void l2cap_move_start(struct l2cap_chan *chan);
 945 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
 946                        u8 status);
 947 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
 948
 949 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
 950 void l2cap_conn_put(struct l2cap_conn *conn);
 951
 952 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
 953 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
 954
 955 #endif /* __L2CAP_H */