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 /* L2CAP defaults */
  31 #define L2CAP_DEFAULT_MTU               672
  32 #define L2CAP_DEFAULT_MIN_MTU           48
  33 #define L2CAP_DEFAULT_FLUSH_TO          0xffff
  34 #define L2CAP_DEFAULT_TX_WINDOW         63
  35 #define L2CAP_DEFAULT_MAX_TX            3
  36 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
  37 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
  38 #define L2CAP_DEFAULT_MAX_PDU_SIZE      1009    /* Sized for 3-DH5 packet */
  39 #define L2CAP_DEFAULT_ACK_TO            200
  40 #define L2CAP_LOCAL_BUSY_TRIES          12
  41
  42 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
  43 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
  44
  45 /* L2CAP socket address */
  46 struct sockaddr_l2 {
  47         sa_family_t     l2_family;
  48         __le16          l2_psm;
  49         bdaddr_t        l2_bdaddr;
  50         __le16          l2_cid;
  51 };
  52
  53 /* L2CAP socket options */
  54 #define L2CAP_OPTIONS   0x01
  55 struct l2cap_options {
  56         __u16 omtu;
  57         __u16 imtu;
  58         __u16 flush_to;
  59         __u8  mode;
  60         __u8  fcs;
  61         __u8  max_tx;
  62         __u16 txwin_size;
  63 };
  64
  65 #define L2CAP_CONNINFO  0x02
  66 struct l2cap_conninfo {
  67         __u16 hci_handle;
  68         __u8  dev_class[3];
  69 };
  70
  71 #define L2CAP_LM        0x03
  72 #define L2CAP_LM_MASTER         0x0001
  73 #define L2CAP_LM_AUTH           0x0002
  74 #define L2CAP_LM_ENCRYPT        0x0004
  75 #define L2CAP_LM_TRUSTED        0x0008
  76 #define L2CAP_LM_RELIABLE       0x0010
  77 #define L2CAP_LM_SECURE         0x0020
  78
  79 /* L2CAP command codes */
  80 #define L2CAP_COMMAND_REJ       0x01
  81 #define L2CAP_CONN_REQ          0x02
  82 #define L2CAP_CONN_RSP          0x03
  83 #define L2CAP_CONF_REQ          0x04
  84 #define L2CAP_CONF_RSP          0x05
  85 #define L2CAP_DISCONN_REQ       0x06
  86 #define L2CAP_DISCONN_RSP       0x07
  87 #define L2CAP_ECHO_REQ          0x08
  88 #define L2CAP_ECHO_RSP          0x09
  89 #define L2CAP_INFO_REQ          0x0a
  90 #define L2CAP_INFO_RSP          0x0b
  91
  92 /* L2CAP feature mask */
  93 #define L2CAP_FEAT_FLOWCTL      0x00000001
  94 #define L2CAP_FEAT_RETRANS      0x00000002
  95 #define L2CAP_FEAT_ERTM         0x00000008
  96 #define L2CAP_FEAT_STREAMING    0x00000010
  97 #define L2CAP_FEAT_FCS          0x00000020
  98 #define L2CAP_FEAT_FIXED_CHAN   0x00000080
  99
 100 /* L2CAP checksum option */
 101 #define L2CAP_FCS_NONE          0x00
 102 #define L2CAP_FCS_CRC16         0x01
 103
 104 /* L2CAP Control Field bit masks */
 105 #define L2CAP_CTRL_SAR               0xC000
 106 #define L2CAP_CTRL_REQSEQ            0x3F00
 107 #define L2CAP_CTRL_TXSEQ             0x007E
 108 #define L2CAP_CTRL_RETRANS           0x0080
 109 #define L2CAP_CTRL_FINAL             0x0080
 110 #define L2CAP_CTRL_POLL              0x0010
 111 #define L2CAP_CTRL_SUPERVISE         0x000C
 112 #define L2CAP_CTRL_FRAME_TYPE        0x0001 /* I- or S-Frame */
 113
 114 #define L2CAP_CTRL_TXSEQ_SHIFT      1
 115 #define L2CAP_CTRL_REQSEQ_SHIFT     8
 116 #define L2CAP_CTRL_SAR_SHIFT       14
 117
 118 /* L2CAP Supervisory Function */
 119 #define L2CAP_SUPER_RCV_READY           0x0000
 120 #define L2CAP_SUPER_REJECT              0x0004
 121 #define L2CAP_SUPER_RCV_NOT_READY       0x0008
 122 #define L2CAP_SUPER_SELECT_REJECT       0x000C
 123
 124 /* L2CAP Segmentation and Reassembly */
 125 #define L2CAP_SDU_UNSEGMENTED       0x0000
 126 #define L2CAP_SDU_START             0x4000
 127 #define L2CAP_SDU_END               0x8000
 128 #define L2CAP_SDU_CONTINUE          0xC000
 129
 130 /* L2CAP structures */
 131 struct l2cap_hdr {
 132         __le16     len;
 133         __le16     cid;
 134 } __packed;
 135 #define L2CAP_HDR_SIZE          4
 136
 137 struct l2cap_cmd_hdr {
 138         __u8       code;
 139         __u8       ident;
 140         __le16     len;
 141 } __packed;
 142 #define L2CAP_CMD_HDR_SIZE      4
 143
 144 struct l2cap_cmd_rej {
 145         __le16     reason;
 146 } __packed;
 147
 148 struct l2cap_conn_req {
 149         __le16     psm;
 150         __le16     scid;
 151 } __packed;
 152
 153 struct l2cap_conn_rsp {
 154         __le16     dcid;
 155         __le16     scid;
 156         __le16     result;
 157         __le16     status;
 158 } __packed;
 159
 160 /* channel indentifier */
 161 #define L2CAP_CID_SIGNALING     0x0001
 162 #define L2CAP_CID_CONN_LESS     0x0002
 163 #define L2CAP_CID_DYN_START     0x0040
 164 #define L2CAP_CID_DYN_END       0xffff
 165
 166 /* connect result */
 167 #define L2CAP_CR_SUCCESS        0x0000
 168 #define L2CAP_CR_PEND           0x0001
 169 #define L2CAP_CR_BAD_PSM        0x0002
 170 #define L2CAP_CR_SEC_BLOCK      0x0003
 171 #define L2CAP_CR_NO_MEM         0x0004
 172
 173 /* connect status */
 174 #define L2CAP_CS_NO_INFO        0x0000
 175 #define L2CAP_CS_AUTHEN_PEND    0x0001
 176 #define L2CAP_CS_AUTHOR_PEND    0x0002
 177
 178 struct l2cap_conf_req {
 179         __le16     dcid;
 180         __le16     flags;
 181         __u8       data[0];
 182 } __packed;
 183
 184 struct l2cap_conf_rsp {
 185         __le16     scid;
 186         __le16     flags;
 187         __le16     result;
 188         __u8       data[0];
 189 } __packed;
 190
 191 #define L2CAP_CONF_SUCCESS      0x0000
 192 #define L2CAP_CONF_UNACCEPT     0x0001
 193 #define L2CAP_CONF_REJECT       0x0002
 194 #define L2CAP_CONF_UNKNOWN      0x0003
 195
 196 struct l2cap_conf_opt {
 197         __u8       type;
 198         __u8       len;
 199         __u8       val[0];
 200 } __packed;
 201 #define L2CAP_CONF_OPT_SIZE     2
 202
 203 #define L2CAP_CONF_HINT         0x80
 204 #define L2CAP_CONF_MASK         0x7f
 205
 206 #define L2CAP_CONF_MTU          0x01
 207 #define L2CAP_CONF_FLUSH_TO     0x02
 208 #define L2CAP_CONF_QOS          0x03
 209 #define L2CAP_CONF_RFC          0x04
 210 #define L2CAP_CONF_FCS          0x05
 211
 212 #define L2CAP_CONF_MAX_SIZE     22
 213
 214 struct l2cap_conf_rfc {
 215         __u8       mode;
 216         __u8       txwin_size;
 217         __u8       max_transmit;
 218         __le16     retrans_timeout;
 219         __le16     monitor_timeout;
 220         __le16     max_pdu_size;
 221 } __packed;
 222
 223 #define L2CAP_MODE_BASIC        0x00
 224 #define L2CAP_MODE_RETRANS      0x01
 225 #define L2CAP_MODE_FLOWCTL      0x02
 226 #define L2CAP_MODE_ERTM         0x03
 227 #define L2CAP_MODE_STREAMING    0x04
 228
 229 struct l2cap_disconn_req {
 230         __le16     dcid;
 231         __le16     scid;
 232 } __packed;
 233
 234 struct l2cap_disconn_rsp {
 235         __le16     dcid;
 236         __le16     scid;
 237 } __packed;
 238
 239 struct l2cap_info_req {
 240         __le16      type;
 241 } __packed;
 242
 243 struct l2cap_info_rsp {
 244         __le16      type;
 245         __le16      result;
 246         __u8        data[0];
 247 } __packed;
 248
 249 /* info type */
 250 #define L2CAP_IT_CL_MTU     0x0001
 251 #define L2CAP_IT_FEAT_MASK  0x0002
 252 #define L2CAP_IT_FIXED_CHAN 0x0003
 253
 254 /* info result */
 255 #define L2CAP_IR_SUCCESS    0x0000
 256 #define L2CAP_IR_NOTSUPP    0x0001
 257
 258 /* ----- L2CAP connections ----- */
 259 struct l2cap_chan_list {
 260         struct sock     *head;
 261         rwlock_t        lock;
 262         long            num;
 263 };
 264
 265 struct l2cap_conn {
 266         struct hci_conn *hcon;
 267
 268         bdaddr_t        *dst;
 269         bdaddr_t        *src;
 270
 271         unsigned int    mtu;
 272
 273         __u32           feat_mask;
 274
 275         __u8            info_state;
 276         __u8            info_ident;
 277
 278         struct timer_list info_timer;
 279
 280         spinlock_t      lock;
 281
 282         struct sk_buff *rx_skb;
 283         __u32           rx_len;
 284         __u8            rx_ident;
 285         __u8            tx_ident;
 286
 287         __u8            disc_reason;
 288
 289         struct l2cap_chan_list chan_list;
 290 };
 291
 292 struct sock_del_list {
 293         struct sock *sk;
 294         struct list_head list;
 295 };
 296
 297 #define L2CAP_INFO_CL_MTU_REQ_SENT      0x01
 298 #define L2CAP_INFO_FEAT_MASK_REQ_SENT   0x04
 299 #define L2CAP_INFO_FEAT_MASK_REQ_DONE   0x08
 300
 301 /* ----- L2CAP channel and socket info ----- */
 302 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 303 #define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
 304 #define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
 305 #define BUSY_QUEUE(sk) (&l2cap_pi(sk)->busy_queue)
 306 #define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
 307
 308 struct srej_list {
 309         __u8    tx_seq;
 310         struct list_head list;
 311 };
 312
 313 struct l2cap_pinfo {
 314         struct bt_sock  bt;
 315         __le16          psm;
 316         __u16           dcid;
 317         __u16           scid;
 318
 319         __u16           imtu;
 320         __u16           omtu;
 321         __u16           flush_to;
 322         __u8            mode;
 323         __u8            num_conf_req;
 324         __u8            num_conf_rsp;
 325
 326         __u8            fcs;
 327         __u8            sec_level;
 328         __u8            role_switch;
 329         __u8            force_reliable;
 330
 331         __u8            conf_req[64];
 332         __u8            conf_len;
 333         __u8            conf_state;
 334         __u16           conn_state;
 335
 336         __u8            next_tx_seq;
 337         __u8            expected_ack_seq;
 338         __u8            expected_tx_seq;
 339         __u8            buffer_seq;
 340         __u8            buffer_seq_srej;
 341         __u8            srej_save_reqseq;
 342         __u8            frames_sent;
 343         __u8            unacked_frames;
 344         __u8            retry_count;
 345         __u8            num_acked;
 346         __u16           sdu_len;
 347         __u16           partial_sdu_len;
 348         struct sk_buff  *sdu;
 349
 350         __u8            ident;
 351
 352         __u8            tx_win;
 353         __u8            max_tx;
 354         __u8            remote_tx_win;
 355         __u8            remote_max_tx;
 356         __u16           retrans_timeout;
 357         __u16           monitor_timeout;
 358         __u16           remote_mps;
 359         __u16           mps;
 360
 361         __le16          sport;
 362
 363         struct timer_list       retrans_timer;
 364         struct timer_list       monitor_timer;
 365         struct timer_list       ack_timer;
 366         struct sk_buff_head     tx_queue;
 367         struct sk_buff_head     srej_queue;
 368         struct sk_buff_head     busy_queue;
 369         struct work_struct      busy_work;
 370         struct srej_list        srej_l;
 371         struct l2cap_conn       *conn;
 372         struct sock             *next_c;
 373         struct sock             *prev_c;
 374 };
 375
 376 #define L2CAP_CONF_REQ_SENT       0x01
 377 #define L2CAP_CONF_INPUT_DONE     0x02
 378 #define L2CAP_CONF_OUTPUT_DONE    0x04
 379 #define L2CAP_CONF_MTU_DONE       0x08
 380 #define L2CAP_CONF_MODE_DONE      0x10
 381 #define L2CAP_CONF_CONNECT_PEND   0x20
 382 #define L2CAP_CONF_NO_FCS_RECV    0x40
 383 #define L2CAP_CONF_STATE2_DEVICE  0x80
 384
 385 #define L2CAP_CONF_MAX_CONF_REQ 2
 386 #define L2CAP_CONF_MAX_CONF_RSP 2
 387
 388 #define L2CAP_CONN_SAR_SDU         0x0001
 389 #define L2CAP_CONN_SREJ_SENT       0x0002
 390 #define L2CAP_CONN_WAIT_F          0x0004
 391 #define L2CAP_CONN_SREJ_ACT        0x0008
 392 #define L2CAP_CONN_SEND_PBIT       0x0010
 393 #define L2CAP_CONN_REMOTE_BUSY     0x0020
 394 #define L2CAP_CONN_LOCAL_BUSY      0x0040
 395 #define L2CAP_CONN_REJ_ACT         0x0080
 396 #define L2CAP_CONN_SEND_FBIT       0x0100
 397 #define L2CAP_CONN_RNR_SENT        0x0200
 398 #define L2CAP_CONN_SAR_RETRY       0x0400
 399
 400 #define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
 401                 jiffies +  msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
 402 #define __mod_monitor_timer() mod_timer(&l2cap_pi(sk)->monitor_timer, \
 403                 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
 404 #define __mod_ack_timer() mod_timer(&l2cap_pi(sk)->ack_timer, \
 405                 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
 406
 407 static inline int l2cap_tx_window_full(struct sock *sk)
 408 {
 409         struct l2cap_pinfo *pi = l2cap_pi(sk);
 410         int sub;
 411
 412         sub = (pi->next_tx_seq - pi->expected_ack_seq) % 64;
 413
 414         if (sub < 0)
 415                 sub += 64;
 416
 417         return sub == pi->remote_tx_win;
 418 }
 419
 420 #define __get_txseq(ctrl)       (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1)
 421 #define __get_reqseq(ctrl)      (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8)
 422 #define __is_iframe(ctrl)       (!((ctrl) & L2CAP_CTRL_FRAME_TYPE))
 423 #define __is_sframe(ctrl)       ((ctrl) & L2CAP_CTRL_FRAME_TYPE)
 424 #define __is_sar_start(ctrl)    (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START)
 425
 426 void l2cap_load(void);
 427
 428 #endif /* __L2CAP_H */