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9e726b1742
When using DEFER_SETUP on a RFCOMM socket, a SABM frame triggers
authorization which when rejected send a DM response. This is fine
according to the RFCOMM spec:
the responding implementation may replace the "proper" response
on the Multiplexer Control channel with a DM frame, sent on the
referenced DLCI to indicate that the DLCI is not open, and that
the responder would not grant a request to open it later either.
But some stacks doesn't seems to cope with this leaving DLCI 0 open after
receiving DM frame.
To fix it properly a timer was introduced to rfcomm_session which is used
to set a timeout when the last active DLC of a session is unlinked, this
will give the remote stack some time to reply with a proper DISC frame on
DLCI 0 avoiding both sides sending DISC to each other on stacks that
follow the specification and taking care of those who don't by taking
down DLCI 0.
Signed-off-by: Luiz Augusto von Dentz <luiz.dentz@openbossa.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
374 lines
9.1 KiB
C
374 lines
9.1 KiB
C
/*
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RFCOMM implementation for Linux Bluetooth stack (BlueZ).
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Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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#ifndef __RFCOMM_H
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#define __RFCOMM_H
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#define RFCOMM_PSM 3
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#define RFCOMM_CONN_TIMEOUT (HZ * 30)
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#define RFCOMM_DISC_TIMEOUT (HZ * 20)
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#define RFCOMM_AUTH_TIMEOUT (HZ * 25)
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#define RFCOMM_IDLE_TIMEOUT (HZ * 2)
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#define RFCOMM_DEFAULT_MTU 127
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#define RFCOMM_DEFAULT_CREDITS 7
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#define RFCOMM_MAX_L2CAP_MTU 1013
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#define RFCOMM_MAX_CREDITS 40
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#define RFCOMM_SKB_HEAD_RESERVE 8
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#define RFCOMM_SKB_TAIL_RESERVE 2
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#define RFCOMM_SKB_RESERVE (RFCOMM_SKB_HEAD_RESERVE + RFCOMM_SKB_TAIL_RESERVE)
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#define RFCOMM_SABM 0x2f
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#define RFCOMM_DISC 0x43
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#define RFCOMM_UA 0x63
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#define RFCOMM_DM 0x0f
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#define RFCOMM_UIH 0xef
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#define RFCOMM_TEST 0x08
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#define RFCOMM_FCON 0x28
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#define RFCOMM_FCOFF 0x18
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#define RFCOMM_MSC 0x38
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#define RFCOMM_RPN 0x24
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#define RFCOMM_RLS 0x14
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#define RFCOMM_PN 0x20
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#define RFCOMM_NSC 0x04
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#define RFCOMM_V24_FC 0x02
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#define RFCOMM_V24_RTC 0x04
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#define RFCOMM_V24_RTR 0x08
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#define RFCOMM_V24_IC 0x40
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#define RFCOMM_V24_DV 0x80
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#define RFCOMM_RPN_BR_2400 0x0
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#define RFCOMM_RPN_BR_4800 0x1
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#define RFCOMM_RPN_BR_7200 0x2
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#define RFCOMM_RPN_BR_9600 0x3
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#define RFCOMM_RPN_BR_19200 0x4
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#define RFCOMM_RPN_BR_38400 0x5
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#define RFCOMM_RPN_BR_57600 0x6
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#define RFCOMM_RPN_BR_115200 0x7
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#define RFCOMM_RPN_BR_230400 0x8
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#define RFCOMM_RPN_DATA_5 0x0
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#define RFCOMM_RPN_DATA_6 0x1
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#define RFCOMM_RPN_DATA_7 0x2
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#define RFCOMM_RPN_DATA_8 0x3
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#define RFCOMM_RPN_STOP_1 0
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#define RFCOMM_RPN_STOP_15 1
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#define RFCOMM_RPN_PARITY_NONE 0x0
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#define RFCOMM_RPN_PARITY_ODD 0x1
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#define RFCOMM_RPN_PARITY_EVEN 0x3
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#define RFCOMM_RPN_PARITY_MARK 0x5
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#define RFCOMM_RPN_PARITY_SPACE 0x7
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#define RFCOMM_RPN_FLOW_NONE 0x00
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#define RFCOMM_RPN_XON_CHAR 0x11
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#define RFCOMM_RPN_XOFF_CHAR 0x13
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#define RFCOMM_RPN_PM_BITRATE 0x0001
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#define RFCOMM_RPN_PM_DATA 0x0002
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#define RFCOMM_RPN_PM_STOP 0x0004
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#define RFCOMM_RPN_PM_PARITY 0x0008
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#define RFCOMM_RPN_PM_PARITY_TYPE 0x0010
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#define RFCOMM_RPN_PM_XON 0x0020
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#define RFCOMM_RPN_PM_XOFF 0x0040
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#define RFCOMM_RPN_PM_FLOW 0x3F00
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#define RFCOMM_RPN_PM_ALL 0x3F7F
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struct rfcomm_hdr {
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u8 addr;
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u8 ctrl;
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u8 len; // Actual size can be 2 bytes
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} __attribute__ ((packed));
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struct rfcomm_cmd {
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u8 addr;
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u8 ctrl;
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u8 len;
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u8 fcs;
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} __attribute__ ((packed));
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struct rfcomm_mcc {
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u8 type;
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u8 len;
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} __attribute__ ((packed));
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struct rfcomm_pn {
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u8 dlci;
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u8 flow_ctrl;
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u8 priority;
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u8 ack_timer;
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__le16 mtu;
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u8 max_retrans;
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u8 credits;
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} __attribute__ ((packed));
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struct rfcomm_rpn {
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u8 dlci;
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u8 bit_rate;
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u8 line_settings;
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u8 flow_ctrl;
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u8 xon_char;
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u8 xoff_char;
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__le16 param_mask;
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} __attribute__ ((packed));
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struct rfcomm_rls {
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u8 dlci;
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u8 status;
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} __attribute__ ((packed));
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struct rfcomm_msc {
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u8 dlci;
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u8 v24_sig;
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} __attribute__ ((packed));
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/* ---- Core structures, flags etc ---- */
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struct rfcomm_session {
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struct list_head list;
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struct socket *sock;
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struct timer_list timer;
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unsigned long state;
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unsigned long flags;
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atomic_t refcnt;
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int initiator;
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/* Default DLC parameters */
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int cfc;
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uint mtu;
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struct list_head dlcs;
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};
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struct rfcomm_dlc {
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struct list_head list;
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struct rfcomm_session *session;
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struct sk_buff_head tx_queue;
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struct timer_list timer;
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spinlock_t lock;
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unsigned long state;
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unsigned long flags;
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atomic_t refcnt;
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u8 dlci;
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u8 addr;
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u8 priority;
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u8 v24_sig;
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u8 remote_v24_sig;
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u8 mscex;
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u8 out;
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u8 sec_level;
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u8 role_switch;
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u32 defer_setup;
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uint mtu;
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uint cfc;
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uint rx_credits;
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uint tx_credits;
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void *owner;
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void (*data_ready)(struct rfcomm_dlc *d, struct sk_buff *skb);
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void (*state_change)(struct rfcomm_dlc *d, int err);
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void (*modem_status)(struct rfcomm_dlc *d, u8 v24_sig);
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};
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/* DLC and session flags */
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#define RFCOMM_RX_THROTTLED 0
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#define RFCOMM_TX_THROTTLED 1
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#define RFCOMM_TIMED_OUT 2
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#define RFCOMM_MSC_PENDING 3
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#define RFCOMM_SEC_PENDING 4
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#define RFCOMM_AUTH_PENDING 5
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#define RFCOMM_AUTH_ACCEPT 6
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#define RFCOMM_AUTH_REJECT 7
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#define RFCOMM_DEFER_SETUP 8
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/* Scheduling flags and events */
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#define RFCOMM_SCHED_STATE 0
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#define RFCOMM_SCHED_RX 1
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#define RFCOMM_SCHED_TX 2
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#define RFCOMM_SCHED_TIMEO 3
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#define RFCOMM_SCHED_AUTH 4
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#define RFCOMM_SCHED_WAKEUP 31
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/* MSC exchange flags */
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#define RFCOMM_MSCEX_TX 1
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#define RFCOMM_MSCEX_RX 2
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#define RFCOMM_MSCEX_OK (RFCOMM_MSCEX_TX + RFCOMM_MSCEX_RX)
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/* CFC states */
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#define RFCOMM_CFC_UNKNOWN -1
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#define RFCOMM_CFC_DISABLED 0
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#define RFCOMM_CFC_ENABLED RFCOMM_MAX_CREDITS
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/* ---- RFCOMM SEND RPN ---- */
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int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
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u8 bit_rate, u8 data_bits, u8 stop_bits,
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u8 parity, u8 flow_ctrl_settings,
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u8 xon_char, u8 xoff_char, u16 param_mask);
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/* ---- RFCOMM DLCs (channels) ---- */
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struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio);
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void rfcomm_dlc_free(struct rfcomm_dlc *d);
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int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel);
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int rfcomm_dlc_close(struct rfcomm_dlc *d, int reason);
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int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb);
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int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig);
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int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig);
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void rfcomm_dlc_accept(struct rfcomm_dlc *d);
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#define rfcomm_dlc_lock(d) spin_lock(&d->lock)
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#define rfcomm_dlc_unlock(d) spin_unlock(&d->lock)
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static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d)
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{
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atomic_inc(&d->refcnt);
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}
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static inline void rfcomm_dlc_put(struct rfcomm_dlc *d)
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{
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if (atomic_dec_and_test(&d->refcnt))
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rfcomm_dlc_free(d);
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}
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extern void __rfcomm_dlc_throttle(struct rfcomm_dlc *d);
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extern void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d);
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static inline void rfcomm_dlc_throttle(struct rfcomm_dlc *d)
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{
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if (!test_and_set_bit(RFCOMM_RX_THROTTLED, &d->flags))
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__rfcomm_dlc_throttle(d);
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}
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static inline void rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
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{
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if (test_and_clear_bit(RFCOMM_RX_THROTTLED, &d->flags))
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__rfcomm_dlc_unthrottle(d);
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}
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/* ---- RFCOMM sessions ---- */
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void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst);
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static inline void rfcomm_session_hold(struct rfcomm_session *s)
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{
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atomic_inc(&s->refcnt);
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}
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/* ---- RFCOMM sockets ---- */
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struct sockaddr_rc {
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sa_family_t rc_family;
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bdaddr_t rc_bdaddr;
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u8 rc_channel;
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};
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#define RFCOMM_CONNINFO 0x02
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struct rfcomm_conninfo {
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__u16 hci_handle;
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__u8 dev_class[3];
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};
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#define RFCOMM_LM 0x03
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#define RFCOMM_LM_MASTER 0x0001
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#define RFCOMM_LM_AUTH 0x0002
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#define RFCOMM_LM_ENCRYPT 0x0004
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#define RFCOMM_LM_TRUSTED 0x0008
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#define RFCOMM_LM_RELIABLE 0x0010
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#define RFCOMM_LM_SECURE 0x0020
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#define rfcomm_pi(sk) ((struct rfcomm_pinfo *) sk)
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struct rfcomm_pinfo {
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struct bt_sock bt;
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struct rfcomm_dlc *dlc;
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u8 channel;
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u8 sec_level;
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u8 role_switch;
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};
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int rfcomm_init_sockets(void);
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void rfcomm_cleanup_sockets(void);
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int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d);
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/* ---- RFCOMM TTY ---- */
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#define RFCOMM_MAX_DEV 256
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#define RFCOMMCREATEDEV _IOW('R', 200, int)
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#define RFCOMMRELEASEDEV _IOW('R', 201, int)
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#define RFCOMMGETDEVLIST _IOR('R', 210, int)
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#define RFCOMMGETDEVINFO _IOR('R', 211, int)
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#define RFCOMMSTEALDLC _IOW('R', 220, int)
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#define RFCOMM_REUSE_DLC 0
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#define RFCOMM_RELEASE_ONHUP 1
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#define RFCOMM_HANGUP_NOW 2
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#define RFCOMM_TTY_ATTACHED 3
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#define RFCOMM_TTY_RELEASED 4
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struct rfcomm_dev_req {
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s16 dev_id;
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u32 flags;
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bdaddr_t src;
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bdaddr_t dst;
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u8 channel;
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};
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struct rfcomm_dev_info {
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s16 id;
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u32 flags;
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u16 state;
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bdaddr_t src;
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bdaddr_t dst;
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u8 channel;
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};
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struct rfcomm_dev_list_req {
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u16 dev_num;
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struct rfcomm_dev_info dev_info[0];
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};
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int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
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#ifdef CONFIG_BT_RFCOMM_TTY
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int rfcomm_init_ttys(void);
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void rfcomm_cleanup_ttys(void);
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#else
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static inline int rfcomm_init_ttys(void)
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{
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return 0;
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}
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static inline void rfcomm_cleanup_ttys(void)
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{
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}
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#endif
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#endif /* __RFCOMM_H */
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