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