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_EXT_WINDOW 0x3FFF 36 #define L2CAP_DEFAULT_MAX_TX 3 37 #define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */ 38 #define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */ 39 #define L2CAP_DEFAULT_MAX_PDU_SIZE 1009 /* Sized for 3-DH5 packet */ 40 #define L2CAP_DEFAULT_ACK_TO 200 41 #define L2CAP_LE_DEFAULT_MTU 23 42 43 #define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */ 44 #define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */ 45 46 /* L2CAP socket address */ 47 struct sockaddr_l2 { 48 sa_family_t l2_family; 49 __le16 l2_psm; 50 bdaddr_t l2_bdaddr; 51 __le16 l2_cid; 52 }; 53 54 /* L2CAP socket options */ 55 #define L2CAP_OPTIONS 0x01 56 struct l2cap_options { 57 __u16 omtu; 58 __u16 imtu; 59 __u16 flush_to; 60 __u8 mode; 61 __u8 fcs; 62 __u8 max_tx; 63 __u16 txwin_size; 64 }; 65 66 #define L2CAP_CONNINFO 0x02 67 struct l2cap_conninfo { 68 __u16 hci_handle; 69 __u8 dev_class[3]; 70 }; 71 72 #define L2CAP_LM 0x03 73 #define L2CAP_LM_MASTER 0x0001 74 #define L2CAP_LM_AUTH 0x0002 75 #define L2CAP_LM_ENCRYPT 0x0004 76 #define L2CAP_LM_TRUSTED 0x0008 77 #define L2CAP_LM_RELIABLE 0x0010 78 #define L2CAP_LM_SECURE 0x0020 79 80 /* L2CAP command codes */ 81 #define L2CAP_COMMAND_REJ 0x01 82 #define L2CAP_CONN_REQ 0x02 83 #define L2CAP_CONN_RSP 0x03 84 #define L2CAP_CONF_REQ 0x04 85 #define L2CAP_CONF_RSP 0x05 86 #define L2CAP_DISCONN_REQ 0x06 87 #define L2CAP_DISCONN_RSP 0x07 88 #define L2CAP_ECHO_REQ 0x08 89 #define L2CAP_ECHO_RSP 0x09 90 #define L2CAP_INFO_REQ 0x0a 91 #define L2CAP_INFO_RSP 0x0b 92 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12 93 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13 94 95 /* L2CAP extended feature mask */ 96 #define L2CAP_FEAT_FLOWCTL 0x00000001 97 #define L2CAP_FEAT_RETRANS 0x00000002 98 #define L2CAP_FEAT_BIDIR_QOS 0x00000004 99 #define L2CAP_FEAT_ERTM 0x00000008 100 #define L2CAP_FEAT_STREAMING 0x00000010 101 #define L2CAP_FEAT_FCS 0x00000020 102 #define L2CAP_FEAT_EXT_FLOW 0x00000040 103 #define L2CAP_FEAT_FIXED_CHAN 0x00000080 104 #define L2CAP_FEAT_EXT_WINDOW 0x00000100 105 #define L2CAP_FEAT_UCD 0x00000200 106 107 /* L2CAP checksum option */ 108 #define L2CAP_FCS_NONE 0x00 109 #define L2CAP_FCS_CRC16 0x01 110 111 /* L2CAP Control Field bit masks */ 112 #define L2CAP_CTRL_SAR 0xC000 113 #define L2CAP_CTRL_REQSEQ 0x3F00 114 #define L2CAP_CTRL_TXSEQ 0x007E 115 #define L2CAP_CTRL_RETRANS 0x0080 116 #define L2CAP_CTRL_FINAL 0x0080 117 #define L2CAP_CTRL_POLL 0x0010 118 #define L2CAP_CTRL_SUPERVISE 0x000C 119 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */ 120 121 #define L2CAP_CTRL_TXSEQ_SHIFT 1 122 #define L2CAP_CTRL_REQSEQ_SHIFT 8 123 #define L2CAP_CTRL_SAR_SHIFT 14 124 125 /* L2CAP Supervisory Function */ 126 #define L2CAP_SUPER_RCV_READY 0x0000 127 #define L2CAP_SUPER_REJECT 0x0004 128 #define L2CAP_SUPER_RCV_NOT_READY 0x0008 129 #define L2CAP_SUPER_SELECT_REJECT 0x000C 130 131 /* L2CAP Segmentation and Reassembly */ 132 #define L2CAP_SDU_UNSEGMENTED 0x0000 133 #define L2CAP_SDU_START 0x4000 134 #define L2CAP_SDU_END 0x8000 135 #define L2CAP_SDU_CONTINUE 0xC000 136 137 /* L2CAP Command rej. reasons */ 138 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000 139 #define L2CAP_REJ_MTU_EXCEEDED 0x0001 140 #define L2CAP_REJ_INVALID_CID 0x0002 141 142 /* L2CAP structures */ 143 struct l2cap_hdr { 144 __le16 len; 145 __le16 cid; 146 } __packed; 147 #define L2CAP_HDR_SIZE 4 148 149 struct l2cap_cmd_hdr { 150 __u8 code; 151 __u8 ident; 152 __le16 len; 153 } __packed; 154 #define L2CAP_CMD_HDR_SIZE 4 155 156 struct l2cap_cmd_rej_unk { 157 __le16 reason; 158 } __packed; 159 160 struct l2cap_cmd_rej_mtu { 161 __le16 reason; 162 __le16 max_mtu; 163 } __packed; 164 165 struct l2cap_cmd_rej_cid { 166 __le16 reason; 167 __le16 scid; 168 __le16 dcid; 169 } __packed; 170 171 struct l2cap_conn_req { 172 __le16 psm; 173 __le16 scid; 174 } __packed; 175 176 struct l2cap_conn_rsp { 177 __le16 dcid; 178 __le16 scid; 179 __le16 result; 180 __le16 status; 181 } __packed; 182 183 /* channel indentifier */ 184 #define L2CAP_CID_SIGNALING 0x0001 185 #define L2CAP_CID_CONN_LESS 0x0002 186 #define L2CAP_CID_LE_DATA 0x0004 187 #define L2CAP_CID_LE_SIGNALING 0x0005 188 #define L2CAP_CID_SMP 0x0006 189 #define L2CAP_CID_DYN_START 0x0040 190 #define L2CAP_CID_DYN_END 0xffff 191 192 /* connect result */ 193 #define L2CAP_CR_SUCCESS 0x0000 194 #define L2CAP_CR_PEND 0x0001 195 #define L2CAP_CR_BAD_PSM 0x0002 196 #define L2CAP_CR_SEC_BLOCK 0x0003 197 #define L2CAP_CR_NO_MEM 0x0004 198 199 /* connect status */ 200 #define L2CAP_CS_NO_INFO 0x0000 201 #define L2CAP_CS_AUTHEN_PEND 0x0001 202 #define L2CAP_CS_AUTHOR_PEND 0x0002 203 204 struct l2cap_conf_req { 205 __le16 dcid; 206 __le16 flags; 207 __u8 data[0]; 208 } __packed; 209 210 struct l2cap_conf_rsp { 211 __le16 scid; 212 __le16 flags; 213 __le16 result; 214 __u8 data[0]; 215 } __packed; 216 217 #define L2CAP_CONF_SUCCESS 0x0000 218 #define L2CAP_CONF_UNACCEPT 0x0001 219 #define L2CAP_CONF_REJECT 0x0002 220 #define L2CAP_CONF_UNKNOWN 0x0003 221 222 struct l2cap_conf_opt { 223 __u8 type; 224 __u8 len; 225 __u8 val[0]; 226 } __packed; 227 #define L2CAP_CONF_OPT_SIZE 2 228 229 #define L2CAP_CONF_HINT 0x80 230 #define L2CAP_CONF_MASK 0x7f 231 232 #define L2CAP_CONF_MTU 0x01 233 #define L2CAP_CONF_FLUSH_TO 0x02 234 #define L2CAP_CONF_QOS 0x03 235 #define L2CAP_CONF_RFC 0x04 236 #define L2CAP_CONF_FCS 0x05 237 #define L2CAP_CONF_EWS 0x07 238 239 #define L2CAP_CONF_MAX_SIZE 22 240 241 struct l2cap_conf_rfc { 242 __u8 mode; 243 __u8 txwin_size; 244 __u8 max_transmit; 245 __le16 retrans_timeout; 246 __le16 monitor_timeout; 247 __le16 max_pdu_size; 248 } __packed; 249 250 #define L2CAP_MODE_BASIC 0x00 251 #define L2CAP_MODE_RETRANS 0x01 252 #define L2CAP_MODE_FLOWCTL 0x02 253 #define L2CAP_MODE_ERTM 0x03 254 #define L2CAP_MODE_STREAMING 0x04 255 256 struct l2cap_disconn_req { 257 __le16 dcid; 258 __le16 scid; 259 } __packed; 260 261 struct l2cap_disconn_rsp { 262 __le16 dcid; 263 __le16 scid; 264 } __packed; 265 266 struct l2cap_info_req { 267 __le16 type; 268 } __packed; 269 270 struct l2cap_info_rsp { 271 __le16 type; 272 __le16 result; 273 __u8 data[0]; 274 } __packed; 275 276 /* info type */ 277 #define L2CAP_IT_CL_MTU 0x0001 278 #define L2CAP_IT_FEAT_MASK 0x0002 279 #define L2CAP_IT_FIXED_CHAN 0x0003 280 281 /* info result */ 282 #define L2CAP_IR_SUCCESS 0x0000 283 #define L2CAP_IR_NOTSUPP 0x0001 284 285 struct l2cap_conn_param_update_req { 286 __le16 min; 287 __le16 max; 288 __le16 latency; 289 __le16 to_multiplier; 290 } __packed; 291 292 struct l2cap_conn_param_update_rsp { 293 __le16 result; 294 } __packed; 295 296 /* Connection Parameters result */ 297 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000 298 #define L2CAP_CONN_PARAM_REJECTED 0x0001 299 300 /* ----- L2CAP channels and connections ----- */ 301 struct srej_list { 302 __u8 tx_seq; 303 struct list_head list; 304 }; 305 306 struct l2cap_chan { 307 struct sock *sk; 308 309 struct l2cap_conn *conn; 310 311 __u8 state; 312 313 atomic_t refcnt; 314 315 __le16 psm; 316 __u16 dcid; 317 __u16 scid; 318 319 __u16 imtu; 320 __u16 omtu; 321 __u16 flush_to; 322 __u8 mode; 323 __u8 chan_type; 324 325 __le16 sport; 326 327 __u8 sec_level; 328 329 __u8 ident; 330 331 __u8 conf_req[64]; 332 __u8 conf_len; 333 __u8 num_conf_req; 334 __u8 num_conf_rsp; 335 336 __u8 fcs; 337 338 __u16 tx_win; 339 __u8 max_tx; 340 __u16 retrans_timeout; 341 __u16 monitor_timeout; 342 __u16 mps; 343 344 unsigned long conf_state; 345 unsigned long conn_state; 346 unsigned long flags; 347 348 __u8 next_tx_seq; 349 __u8 expected_ack_seq; 350 __u8 expected_tx_seq; 351 __u8 buffer_seq; 352 __u8 buffer_seq_srej; 353 __u8 srej_save_reqseq; 354 __u8 frames_sent; 355 __u8 unacked_frames; 356 __u8 retry_count; 357 __u8 num_acked; 358 __u16 sdu_len; 359 struct sk_buff *sdu; 360 struct sk_buff *sdu_last_frag; 361 362 __u16 remote_tx_win; 363 __u8 remote_max_tx; 364 __u16 remote_mps; 365 366 struct timer_list chan_timer; 367 struct timer_list retrans_timer; 368 struct timer_list monitor_timer; 369 struct timer_list ack_timer; 370 struct sk_buff *tx_send_head; 371 struct sk_buff_head tx_q; 372 struct sk_buff_head srej_q; 373 struct list_head srej_l; 374 375 struct list_head list; 376 struct list_head global_l; 377 378 void *data; 379 struct l2cap_ops *ops; 380 }; 381 382 struct l2cap_ops { 383 char *name; 384 385 struct l2cap_chan *(*new_connection) (void *data); 386 int (*recv) (void *data, struct sk_buff *skb); 387 void (*close) (void *data); 388 void (*state_change) (void *data, int state); 389 }; 390 391 struct l2cap_conn { 392 struct hci_conn *hcon; 393 394 bdaddr_t *dst; 395 bdaddr_t *src; 396 397 unsigned int mtu; 398 399 __u32 feat_mask; 400 401 __u8 info_state; 402 __u8 info_ident; 403 404 struct timer_list info_timer; 405 406 spinlock_t lock; 407 408 struct sk_buff *rx_skb; 409 __u32 rx_len; 410 __u8 tx_ident; 411 412 __u8 disc_reason; 413 414 struct timer_list security_timer; 415 struct smp_chan *smp_chan; 416 417 struct list_head chan_l; 418 rwlock_t chan_lock; 419 }; 420 421 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01 422 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04 423 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08 424 425 #define L2CAP_CHAN_RAW 1 426 #define L2CAP_CHAN_CONN_LESS 2 427 #define L2CAP_CHAN_CONN_ORIENTED 3 428 429 /* ----- L2CAP socket info ----- */ 430 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk) 431 432 struct l2cap_pinfo { 433 struct bt_sock bt; 434 struct l2cap_chan *chan; 435 struct sk_buff *rx_busy_skb; 436 }; 437 438 enum { 439 CONF_REQ_SENT, 440 CONF_INPUT_DONE, 441 CONF_OUTPUT_DONE, 442 CONF_MTU_DONE, 443 CONF_MODE_DONE, 444 CONF_CONNECT_PEND, 445 CONF_NO_FCS_RECV, 446 CONF_STATE2_DEVICE, 447 CONF_EWS_RECV, 448 }; 449 450 #define L2CAP_CONF_MAX_CONF_REQ 2 451 #define L2CAP_CONF_MAX_CONF_RSP 2 452 453 enum { 454 CONN_SREJ_SENT, 455 CONN_WAIT_F, 456 CONN_SREJ_ACT, 457 CONN_SEND_PBIT, 458 CONN_REMOTE_BUSY, 459 CONN_LOCAL_BUSY, 460 CONN_REJ_ACT, 461 CONN_SEND_FBIT, 462 CONN_RNR_SENT, 463 }; 464 465 /* Definitions for flags in l2cap_chan */ 466 enum { 467 FLAG_ROLE_SWITCH, 468 FLAG_FORCE_ACTIVE, 469 FLAG_FORCE_RELIABLE, 470 FLAG_FLUSHABLE, 471 FLAG_EXT_CTRL, 472 }; 473 474 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t)) 475 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer) 476 #define __set_retrans_timer(c) l2cap_set_timer(c, &c->retrans_timer, \ 477 L2CAP_DEFAULT_RETRANS_TO); 478 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer) 479 #define __set_monitor_timer(c) l2cap_set_timer(c, &c->monitor_timer, \ 480 L2CAP_DEFAULT_MONITOR_TO); 481 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer) 482 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \ 483 L2CAP_DEFAULT_ACK_TO); 484 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer) 485 486 static inline int l2cap_tx_window_full(struct l2cap_chan *ch) 487 { 488 int sub; 489 490 sub = (ch->next_tx_seq - ch->expected_ack_seq) % 64; 491 492 if (sub < 0) 493 sub += 64; 494 495 return sub == ch->remote_tx_win; 496 } 497 498 #define __get_txseq(ctrl) (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1) 499 #define __get_reqseq(ctrl) (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8) 500 #define __is_iframe(ctrl) (!((ctrl) & L2CAP_CTRL_FRAME_TYPE)) 501 #define __is_sframe(ctrl) ((ctrl) & L2CAP_CTRL_FRAME_TYPE) 502 #define __is_sar_start(ctrl) (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START) 503 504 extern int disable_ertm; 505 506 int l2cap_init_sockets(void); 507 void l2cap_cleanup_sockets(void); 508 509 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan); 510 int __l2cap_wait_ack(struct sock *sk); 511 512 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm); 513 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid); 514 515 struct l2cap_chan *l2cap_chan_create(struct sock *sk); 516 void l2cap_chan_close(struct l2cap_chan *chan, int reason); 517 void l2cap_chan_destroy(struct l2cap_chan *chan); 518 int l2cap_chan_connect(struct l2cap_chan *chan); 519 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len); 520 void l2cap_chan_busy(struct l2cap_chan *chan, int busy); 521 522 #endif /* __L2CAP_H */ 523