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 */ 46struct 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 55struct 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 66struct 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 */ 131struct l2cap_hdr { 132 __le16 len; 133 __le16 cid; 134} __packed; 135#define L2CAP_HDR_SIZE 4 136 137struct l2cap_cmd_hdr { 138 __u8 code; 139 __u8 ident; 140 __le16 len; 141} __packed; 142#define L2CAP_CMD_HDR_SIZE 4 143 144struct l2cap_cmd_rej { 145 __le16 reason; 146} __packed; 147 148struct l2cap_conn_req { 149 __le16 psm; 150 __le16 scid; 151} __packed; 152 153struct 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 178struct l2cap_conf_req { 179 __le16 dcid; 180 __le16 flags; 181 __u8 data[0]; 182} __packed; 183 184struct 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 196struct 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 214struct 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 229struct l2cap_disconn_req { 230 __le16 dcid; 231 __le16 scid; 232} __packed; 233 234struct l2cap_disconn_rsp { 235 __le16 dcid; 236 __le16 scid; 237} __packed; 238 239struct l2cap_info_req { 240 __le16 type; 241} __packed; 242 243struct 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 ----- */ 259struct l2cap_chan_list { 260 struct sock *head; 261 rwlock_t lock; 262 long num; 263}; 264 265struct 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 292struct 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 308struct srej_list { 309 __u8 tx_seq; 310 struct list_head list; 311}; 312 313struct 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 407static 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 426void l2cap_load(void); 427 428#endif /* __L2CAP_H */ 429